CN105529942A - PFC rectifier, uninterrupted power source, control method and control device - Google Patents

PFC rectifier, uninterrupted power source, control method and control device Download PDF

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Publication number
CN105529942A
CN105529942A CN201410515253.2A CN201410515253A CN105529942A CN 105529942 A CN105529942 A CN 105529942A CN 201410515253 A CN201410515253 A CN 201410515253A CN 105529942 A CN105529942 A CN 105529942A
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tube
pfc
electric capacity
switching tube
switch
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CN105529942B (en
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刘中伟
倪同
沈宝山
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Vertiv Corp
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Liebert Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The invention provides a PFC rectifier, an uninterrupted power source, a control method and a control device and solves a problem of electromagnetic interference caused by high frequency jump of the potential of an electrode of a DC power source generated between the potential of a zero wire of an AC power source and the potential of a bus output end connected with a freewheeling tube when a PFC rectification circuit working in a cell mode carries out energy storage for a bus capacitor connected with the freewheeling tube connected with the electrode of the DC power source. The PFC rectifier comprises the PFC rectification circuit, a first rectification tube of the PFC rectification circuit is a switch tube of an anti-parallel diode or a parallel structure of a switch and a diode, wherein the first rectification tube is the one of two rectification tubes of the PFC rectification circuit working in the cell mode, the one of the two rectification tubes is connected with the DC power source, and in the cell mode, the DC power source provides power for the PFC rectifier.

Description

A kind of PFC rectifier, uninterrupted power supply, control method and device
Technical field
The present invention relates to electric and electronic technical field, particularly relate to a kind of PFC rectifier, uninterrupted power supply, control method and device.
Background technology
Uninterrupted power supply (UPS, UninterruptiblePowerSupply) power factor correction (PFC in, PowerFactorCorrection) rectification circuit is in the power section of more than 5KVA, along with the rising of direct current power source voltage, in design as much as possible by AC/DC converter and DC/DC converter common sparing device, to reach the object reduced costs.The preposition scheme of single inductance, namely can reduce costs as much as possible in the scheme of the input increase PFC inductance of DC/DC converter, but adopt in most of uninterrupted power supply topologys of the preposition scheme of single inductance, all there is the problem of electromagnetic interference.
In the Single Phase PFC Rectifier of the use monocell group shown in Fig. 1 a, under battery mode, K switch 1 connects the positive pole of battery pack DC, and K switch 2 closes, when the C1 energy storage of positive bus-bar electric capacity, switching tube Q2 conducting, switching tube Q1 high frequency chopping, when switching tube Q1 conducting, electric current arrives the negative pole of battery pack DC through the positive pole of battery pack DC, K switch 1, inductance L 1, diode D1, switching tube Q1, switching tube Q2, thus formation tank circuit, to inductance L 1, i.e. PFC induction charging; When switching tube Q1 turns off, battery pack DC and inductance L 1 charge jointly to positive bus-bar electric capacity C1, and electric current arrives the negative pole of battery pack DC through inductance L 1, diode D1, diode D3, positive bus-bar electric capacity C1, switching tube Q2, K switch 2.Due to switching tube Q2 normal open, therefore, the negative pole of battery pack DC is clamped at the current potential of the zero line N of AC power AC.
Circuit shown in Fig. 1 a, under battery mode, K switch 1 connects the positive pole of battery pack DC, and K switch 2 closes, when the C2 energy storage of negative busbar electric capacity, switching tube Q1 normal open, switching tube Q2 high frequency chopping, when switching tube Q2 conducting, electric current arrives the negative pole of battery pack DC through the positive pole of battery pack DC, K switch 1, inductance L 1, diode D1, switching tube Q1, switching tube Q2, thus formation tank circuit, to inductance L 1, i.e. PFC induction charging; Now due to switching tube Q2 conducting, therefore, the negative pole of battery pack DC is clamped at the current potential of the zero line N of AC power AC; When switching tube Q2 turns off, battery pack DC and inductance L 1 charge jointly to negative busbar electric capacity C2, and electric current arrives the negative pole of battery pack DC through inductance L 1, diode D1, switching tube Q1, negative busbar electric capacity C2, diode D4, K switch 2; Now due to diode D4 conducting, therefore, the negative pole of battery pack DC is clamped at the current potential of negative busbar BUS-.
That is, the Single Phase PFC Rectifier of the use monocell group shown in Fig. 1 a operationally, the high frequency saltus step between the current potential and the current potential of negative busbar BUS-of the zero line N of AC power AC of the current potential of the negative pole of battery pack DC can be caused, thus at the upper common mode current forming very strong high frequency of electric capacity C3 (direct-to-ground capacitance of the negative pole of battery pack DC) and electric capacity C4 (direct-to-ground capacitance of the positive pole of battery pack DC), namely form electromagnetic interference.
In the Single Phase PFC Rectifier of the use monocell group shown in Fig. 1 b, under battery mode, K switch 1 connects the negative pole of battery pack DC, and K switch 2 closes, when the C1 energy storage of positive bus-bar electric capacity, switching tube Q2 normal open, switching tube Q1 high frequency chopping, when switching tube Q1 conducting, electric current arrives the negative pole of battery pack DC through the positive pole of battery pack DC, K switch 2, switching tube Q1, switching tube Q2, diode D2, inductance L 1, thus formation tank circuit, to inductance L 1, i.e. PFC induction charging; Now, due to switching tube Q1 conducting, therefore, the positive pole of battery pack DC is clamped at the current potential of the zero line N of AC power AC; When switching tube Q1 turns off, battery pack DC and inductance L 1 charge jointly to positive bus-bar electric capacity C1, and electric current arrives the negative pole of battery pack DC through the positive pole of battery pack DC, K switch 2, diode D3, positive bus-bar electric capacity C1, switching tube Q2, diode D2, inductance L 1; Now, due to diode D3 conducting, therefore, the positive pole of battery pack DC is clamped at the current potential of positive bus-bar BUS+.
Circuit shown in Fig. 1 b, under battery mode, K switch 1 connects the negative pole of battery pack DC, and K switch 2 closes, when the C2 energy storage of negative busbar electric capacity, switching tube Q1 normal open, switching tube Q2 high frequency chopping, when switching tube Q2 conducting, electric current arrives the negative pole of battery pack DC through the positive pole of battery pack DC, K switch 2, switching tube Q1, switching tube Q2, diode D2, inductance L 1, thus formation tank circuit, to inductance L 1, i.e. PFC induction charging; When switching tube Q2 turns off, battery pack DC and inductance L 1 charge jointly to negative busbar electric capacity C2, and electric current arrives the negative pole of battery pack DC through K switch 2, switching tube Q1, negative busbar electric capacity C2, diode D4, diode D2, inductance L 1; Now due to switching tube Q1 normal open, therefore, the positive pole of battery pack DC is clamped at the current potential of the zero line N of AC power AC.
That is, the Single Phase PFC Rectifier of the use monocell group shown in Fig. 1 b operationally, the high frequency saltus step between the current potential and the current potential of positive bus-bar BUS+ of the zero line N of AC power AC of the current potential of the positive pole of battery pack DC can be caused, thus at the upper common mode current forming very strong high frequency of electric capacity C3 (direct-to-ground capacitance of the negative pole of battery pack DC) and electric capacity C4 (direct-to-ground capacitance of the positive pole of battery pack DC), namely form electromagnetic interference.
In sum, under the PFC rectification circuit of existing use monocell group is operated in battery mode, when the bus capacitor energy storage that the continued flow tube for being connected with an electrode of DC power supply is connected (the negative busbar electric capacity C2 namely in Fig. 1 a or the positive bus-bar electric capacity C1 in Fig. 1 b), high frequency saltus step between the current potential of the bus that the current potential of this electrode of DC power supply is connected at the current potential of the zero line of AC power and the continued flow tube that is connected with this electrode of DC power supply, this can form the common mode current of very strong high frequency on the direct-to-ground capacitance of the direct-to-ground capacitance of the positive pole of DC power supply and the negative pole of DC power supply, thus formation electromagnetic interference.
Summary of the invention
Embodiments provide a kind of PFC rectifier, uninterrupted power supply, control method and device, in order to solve under existing PFC rectification circuit is operated in battery mode, when the bus capacitor energy storage that the continued flow tube for being connected with an electrode of DC power supply is connected, high frequency saltus step between the current potential of the bus that the current potential of this electrode of DC power supply is connected at the current potential of the zero line of AC power and the continued flow tube that is connected with this electrode of DC power supply, this can form the common mode current of very strong high frequency on the direct-to-ground capacitance of the direct-to-ground capacitance of the positive pole of DC power supply and the negative pole of DC power supply, thus form the problem of electromagnetic interference.
Based on the problems referred to above, a kind of PFC rectifier that the embodiment of the present invention provides, comprises PFC rectification circuit;
The first rectifying tube in described PFC rectification circuit is the switching tube of inverse parallel body diode, or is the parallel-connection structure of switch and diode;
Wherein, described first rectifying tube is the rectifying tube be connected with DC power supply in two rectifying tubes of PFC rectification circuit when being operated under battery mode in described PFC rectification circuit; Wherein, time under battery mode, described DC power supply is described PFC rectifier power supply.
Further, the first continued flow tube in described PFC rectification circuit is diode or the switching tube for inverse parallel body diode;
Wherein, the first continued flow tube in described PFC rectification circuit is the continued flow tube be directly connected with described first rectifying tube in two continued flow tubes in described PFC rectification circuit.
Further, when the first continued flow tube in described PFC rectification circuit is diode, described PFC rectifier also comprises the first electric capacity, and described first electric capacity is in parallel with described first continued flow tube.
Further, when the first continued flow tube in described PFC rectification circuit is diode, described PFC rectifier also comprises the first switch, and described first switch is in parallel with described first continued flow tube;
Described first switch, for be operated under battery mode at described PFC rectifier be the first bus capacitor energy storage process in PFC inductance storage power time closed; Described first bus capacitor is the positive bus-bar electric capacity of described PFC rectification circuit and the bus capacitor be directly connected with described first continued flow tube in negative busbar electric capacity; And for disconnecting in any one situation when following two kinds of situations: it is the second bus capacitor energy storage under being operated in battery mode that described PFC rectifier is operated in utility mode, described PFC rectifier; Described second bus capacitor is the bus capacitor located in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity beyond described first bus capacitor.
Further, the second rectifying tube in the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is the switching tube of inverse parallel body diode, or is the parallel-connection structure of switch and diode; Wherein, described second rectifying tube is the rectifying tube in two rectifying tubes in described PFC rectification circuit except described first rectifying tube.
Alternatively, the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is Single Phase PFC Rectifier, or is heterogeneous PFC rectification circuit.
A kind of uninterrupted power supply that the embodiment of the present invention provides, comprises the PFC rectifier that the embodiment of the present invention provides.
The control method that the embodiment of the present invention provides, for controlling the PFC rectifier that the embodiment of the present invention provides, comprising:
Described PFC rectifier by DC power supply and be the first bus capacitor energy storage in described PFC rectifier time, control the first main switch and turn off, and control the second main switch conducting, and control described first rectifying tube high frequency chopping;
Wherein, described first main switch is the main switch be directly connected with described first rectifying tube in two main switches of described PFC rectification circuit, and described second main switch is the main switch in two main switches of described PFC rectification circuit except described first main switch; Described first bus capacitor is the positive bus-bar electric capacity of described PFC rectification circuit and the bus capacitor be directly connected with the first continued flow tube in negative busbar electric capacity; Described first continued flow tube is the continued flow tube be directly connected with described first rectifying tube in two continued flow tubes in described PFC rectification circuit.
Further, the control method that the embodiment of the present invention provides also comprises:
Described PFC rectifier by DC power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described first main switch conducting, control described second main switch high frequency chopping, control described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper;
Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
Further, the control method that the embodiment of the present invention provides also comprises:
Described PFC rectifier by ac power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described second main switch high frequency chopping, control described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper;
Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
Further, when the second rectifying tube in the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is the switching tube of inverse parallel body diode, or be the parallel-connection structure of switch and diode, the control method that the embodiment of the present invention provides also comprises:
Described PFC rectification circuit by ac power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described first main switch high frequency chopping, control described second rectifying tube high frequency chopping, and described first main switch and described second rectifying tube alternating chopper;
Wherein, described second rectifying tube is the rectifying tube in two rectifying tubes in described PFC rectification circuit except described first rectifying tube.
The control device that the embodiment of the present invention provides, for controlling the PFC rectifier that the present invention's example provides, comprising:
First control module, for described PFC rectifier by DC power supply and be the first bus capacitor energy storage in described PFC rectifier time, control first main switch turn off;
Second control module, for described PFC rectifier by DC power supply and be the first bus capacitor energy storage in described PFC rectifier time, control the second main switch conducting;
3rd control module, for described PFC rectifier by DC power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described first rectifying tube high frequency chopping;
Wherein, described first main switch is the main switch be directly connected with described first rectifying tube in two main switches of described PFC rectification circuit, and described second main switch is the main switch in two main switches of described PFC rectification circuit except described first main switch; Described first bus capacitor is the positive bus-bar electric capacity of described PFC rectification circuit and the bus capacitor be directly connected with the first continued flow tube in negative busbar electric capacity; Described first continued flow tube is the continued flow tube be directly connected with described first rectifying tube in two continued flow tubes in described PFC rectification circuit.
Further, described first control module, also for described PFC rectifier by DC power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described first main switch conducting;
Described second control module, also for described PFC rectifier by DC power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described second main switch high frequency chopping;
Described 3rd control module, also for when described PFC rectifier is the second bus capacitor energy storage in described PFC rectifier, controls described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper;
Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
Further, described second control module, also for described PFC rectifier by ac power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described second main switch high frequency chopping;
Described 3rd control module, also for when described PFC rectifier is the second bus capacitor energy storage in described PFC rectifier, controls described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper;
Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
Further, when the switching tube that the second rectifying tube in the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is inverse parallel body diode, or be the parallel-connection structure of switch and diode, the control device that the embodiment of the present invention provides also comprises the 4th control module;
Described 4th control module, for described PFC rectification circuit by ac power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described second rectifying tube high frequency chopping;
Described first control module, also for described PFC rectification circuit by ac power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described first main switch high frequency chopping, and described first main switch and described second rectifying tube alternating chopper;
Wherein, described second rectifying tube is the rectifying tube in two rectifying tubes in described PFC rectification circuit except described first rectifying tube.
The beneficial effect of the embodiment of the present invention comprises:
A kind of PFC rectifier that the embodiment of the present invention provides, uninterrupted power supply, control method and device, due to the switching tube that the first rectifying tube in PFC rectifier is inverse parallel body diode, or be the parallel-connection structure of switch and diode, first rectifying tube is the rectifying tube be connected with DC power supply in two rectifying tubes of PFC rectification circuit when being operated under battery mode in described PFC rectification circuit, therefore, under PFC rectifier is operated in battery mode, and during for the first bus capacitor (bus capacitor that the continued flow tube be connected with the first rectifying tube in the positive bus-bar electric capacity that the first bus capacitor is PFC rectification circuit and negative busbar electric capacity is directly connected) energy storage, the first rectifying tube high frequency chopping can be controlled, the main switch be directly connected with the first rectifying tube turns off, thus the switching tube conducting in the first rectifying tube or the switch in the first rectifying tube are when closing, by the DC power supply for PFC rectifier power supply, PFC inductance in PFC rectifier, and first rectifying tube form tank circuit be PFC inductive energy storage, and owing to turning off with the main switch that the first rectifying tube is directly connected, therefore, tank circuit and zero line disconnect, when PFC rectification circuit is operated under battery mode, voltage on the electrode be connected with the first rectifying tube in DC power supply equals the voltage of the first bus output (the first bus output is positive bus-bar output in PFC rectifier and the output be directly connected with the first bus capacitor in negative busbar output) of PFC rectifier, the voltage of rectifying tube after the first continued flow tube dividing potential drop (the first continued flow tube is the continued flow tube be directly connected with the first rectifying tube of PFC rectifier in two continued flow tubes of PFC rectifier) in two rectifying tubes of PFC rectifier except the first rectifying tube, this voltage is less than the voltage of the first bus output of PFC rectifier, and under PFC rectifier is operated in battery mode, and when being the first bus capacitor energy storage, in the process that PFC inductance releases energy, due to the first continued flow tube conducting, voltage on the electrode be connected with the first rectifying tube in DC power supply equals the voltage of the first bus output of PFC rectifier, therefore, compared to PFC rectification circuit of the prior art due under battery mode, and when being the first bus capacitor energy storage, current potential high frequency saltus step between the current potential and the current potential of the first bus output of zero line of the electrode be connected with the first rectifying tube in DC power supply, the PFC rectifier that the embodiment of the present invention provides, uninterrupted power supply, control method and device can reduce the amplitude of the jump in potential of the electrode be connected with the first rectifying tube in DC power supply, therefore, reduce electromagnetic interference.
Accompanying drawing explanation
Fig. 1 a and Fig. 1 b is the structural representation of PFC rectification circuit of the prior art;
The structural representation of the Single-phase PFC rectifier that Fig. 2 a-Fig. 4 b, Fig. 6 a-Figure 18 b provide for the embodiment of the present invention;
Fig. 5 is the schematic diagram of the control signal that the first rectifying tube and second switch pipe receive;
The structural representation of the three-phase PFC rectifier that Figure 19 a-Figure 34 b provides for the embodiment of the present invention;
One of structural representation of the control device that Figure 35 provides for the embodiment of the present invention;
The structural representation two of the control device that Figure 36 provides for the embodiment of the present invention.
Embodiment
A kind of PFC rectifier that the embodiment of the present invention provides, uninterrupted power supply, control method and device, under being operated in battery mode at PFC rectifier, and when being the first bus capacitor energy storage, can by the DC power supply for PFC rectifier power supply, PFC inductance in PFC rectifier, and first rectifying tube form tank circuit be PFC inductive energy storage, and tank circuit can be controlled and zero line disconnects, therefore, voltage on the electrode be connected with the first rectifying tube in DC power supply equals the voltage of the first bus output (the first bus output is positive bus-bar output in PFC rectifier and the output be directly connected with the first bus capacitor in negative busbar output) of PFC rectifier, the voltage of rectifying tube after the first continued flow tube dividing potential drop (the first continued flow tube is the continued flow tube be connected with the first rectifying tube of PFC rectifier in two continued flow tubes of PFC rectifier) in two rectifying tubes of PFC rectifier except the first rectifying tube, this voltage is less than the voltage of the first bus output of PFC rectifier, and under PFC rectifier is operated in battery mode, and when being the first bus capacitor energy storage, in the process that PFC inductance releases energy, due to the first continued flow tube conducting, voltage on the electrode be connected with the first rectifying tube in DC power supply equals the voltage of the first bus output of PFC rectifier, this compared to PFC rectification circuit of the prior art due under battery mode, and when being the first bus capacitor energy storage, current potential high frequency saltus step between the current potential and the current potential of the first bus output of zero line of the electrode be connected with the first rectifying tube in DC power supply, the PFC rectifier that the embodiment of the present invention provides, uninterrupted power supply, control method and device can reduce the amplitude of the jump in potential of the negative pole of DC power supply, therefore, reduce electromagnetic interference.
Below in conjunction with Figure of description, the embodiment of a kind of PFC rectifier, DC power supply, control method and device that the embodiment of the present invention provides is described.
When the PFC rectifier that the embodiment of the present invention provides is operated in the positive pole connection PFC inductance for the DC power supply of PFC rectifier power supply under battery mode, the first bus capacitor in this PFC rectifier is negative busbar electric capacity, second bus capacitor is positive bus-bar electric capacity, the first bus output in this PFC rectifier is negative busbar output, the second bus output in this PFC rectifier is positive bus-bar output, and the first continued flow tube in this PFC rectifier is the continued flow tube be directly connected with negative busbar electric capacity in two continued flow tubes of this PFC rectifier.
The PFC rectifier provided when the embodiment of the present invention is operated under battery mode as the negative pole of the DC power supply of PFC rectifier power supply connects PFC inductance, the first bus capacitor in this PFC rectifier is positive bus-bar electric capacity, second bus capacitor is negative busbar electric capacity, the first bus output in PFC rectifier is positive bus-bar output, the second bus output in PFC rectifier is negative busbar output, and the first continued flow tube in this PFC rectifier is the continued flow tube be directly connected with negative busbar electric capacity in two continued flow tubes of this PFC rectifier.
The second continued flow tube in the PFC rectifier that the embodiment of the present invention provides is the continued flow tube in two continued flow tubes of this PFC rectifier except the first continued flow tube, the first switching tube in this PFC rectifier is the switching tube be directly connected with the first continued flow tube in two switching tubes of this PFC rectifier, second switch pipe in this PFC rectifier is the switching tube in two switching tubes of this PFC rectifier except the first switching tube, the first rectifying tube in this PFC rectifier is the rectifying tube be directly connected with the first continued flow tube in two rectifying tubes in this PFC rectifier, the second rectifying tube in this PFC rectifier is the rectifying tube in two rectifying tubes in this PFC rectifier except the first rectifying tube.
When the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is Single Phase PFC Rectifier, a kind of PFC rectifier that the embodiment of the present invention provides, as shown in Fig. 2 a or Fig. 2 b, comprises PFC rectification circuit; The first rectifying tube 21 in this PFC rectification circuit is the switching tube Q3 (shown in Fig. 3 a or Fig. 3 b) of inverse parallel body diode, or be the parallel-connection structure (being K switch 3 and the parallel-connection structure of diode D2 in fig .4, is the parallel-connection structure of K switch 3 and diode D1 in fig. 4b) of switch and diode; Wherein, the first rectifying tube 21 is the rectifying tubes be connected with DC power supply DC in two rectifying tubes of PFC rectification circuit when being operated under battery mode in PFC rectification circuit; Wherein, time under battery mode, DC power supply DC is PFC rectifier power supply.
When PFC rectifier is operated under battery mode, in Fig. 2 a, Fig. 3 a or Fig. 4 a, the positive pole of DC power supply DC connects the PFC inductance in PFC rectifier, i.e. inductance L 1; In Fig. 2 b, Fig. 3 b or Fig. 4 b, the negative pole of DC power supply DC connects the PFC inductance in PFC rectifier, i.e. inductance L 1.
PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is Single Phase PFC Rectifier, and when the positive pole that PFC rectifier is operated in DC power supply DC under battery mode connects the PFC inductance in PFC rectifier, the PFC rectifier that the embodiment of the present invention provides, as Fig. 2 a, shown in Fig. 3 a or Fig. 4 a, diode D1 and the first rectifying tube 21 (or the switching tube Q3 in Fig. 3 a, or the parallel-connection structure of K switch 3 in Fig. 4 a and diode D2) formation first branch road of connecting, switching tube Q1 and switching tube Q2 series connection formation second branch road (tie point that switching tube Q1 is connected with switching tube Q2 is M point), PFC inductance, namely one end of inductance L 1 connects diode D1 and the first rectifying tube 21 (or the switching tube Q3 in Fig. 3 a, or the parallel-connection structure of K switch 3 in Fig. 4 a and diode D2) tie point that is connected, first branch road is connected positive bus-bar electric capacity with the one end after the second branch circuit parallel connection by diode D3, i.e. one end of electric capacity C1, and one end that diode D3 is connected with electric capacity C1 is the positive bus-bar output BUS+ of PFC rectifier, first branch road is connected negative busbar electric capacity with the other end after the second branch circuit parallel connection by the first continued flow tube 22, i.e. one end of electric capacity C2, the other end of electric capacity C2 connects the other end of electric capacity C1, and one end that the first continued flow tube 22 is connected with electric capacity C2 is the negative busbar output BUS-of PFC rectifier, the voltage of the tie point that electric capacity C1 is connected with electric capacity C2 is the voltage on the zero line N in AC power AC.
When Fig. 2 a, Fig. 3 a or the PFC rectifier shown in Fig. 4 a are operated under battery mode, PFC inductance, namely inductance L 1 is connected by the positive pole of K switch 1 with DC power supply DC, and K switch 2 closes.Be the second bus capacitor under the PFC rectifier shown in Fig. 2 a, Fig. 3 a or Fig. 4 a is operated in battery mode, namely during electric capacity C1 (positive bus-bar electric capacity) energy storage, Fig. 2 a, Fig. 3 a or the PFC rectifier shown in Fig. 4 a have three kinds of working methods.
The first working method is: the first rectifying tube 21 high frequency chopping (the switching tube Q3 high frequency chopping in Fig. 3 a, K switch 3 high frequency chopping in Fig. 4 a) in Fig. 2 a, and switching tube Q1 turns off, switching tube Q2 conducting; When the first rectifying tube 21 conducting (switching tube Q3 conducting in Fig. 3 a, K switch 3 in Fig. 4 a closes) time, electric current is through positive pole, PFC inductance (i.e. inductance L 1), first rectifying tube 21 (the switching tube Q3 in Fig. 3 a of DC power supply DC, K switch 3 in Fig. 4 a), arrive the negative pole of DC power supply DC, form tank circuit, inductance L 1 energy storage; When the first rectifying tube 21 turns off, (the switching tube Q3 in Fig. 3 a turns off, K switch 3 in Fig. 4 a disconnects) time, electric current is through positive pole, inductance L 1, diode D1, diode D3, electric capacity C1, the switching tube Q2 of DC power supply DC, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 1 releases energy, electric capacity C1 energy storage; That is, when PFC rectifier is electric capacity C1 energy storage, DC power supply DC, inductance L 1, first rectifying tube 21 (the switching tube Q3 in Fig. 3 a, the K switch 3 in Fig. 4 a), diode D1, diode D3, electric capacity C1, switching tube Q2 form boost circuit.Due to switching tube Q2 conducting, therefore, the current potential of the negative pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
The second working method is: the first rectifying tube 21 turns off (the switching tube Q3 in Fig. 3 a turns off, and the K switch 3 in Fig. 4 a disconnects), switching tube Q1 high frequency chopping, switching tube Q2 conducting; When switching tube Q1 conducting, electric current, through positive pole, inductance L 1, diode D1, switching tube Q1, the switching tube Q2 of DC power supply DC, arrives the negative pole of DC power supply DC, forms tank circuit, inductance L 1 energy storage; When switching tube Q1 turns off, electric current, through positive pole, inductance L 1, diode D1, diode D3, electric capacity C1, the switching tube Q2 of DC power supply DC, arrives the negative pole of DC power supply DC, and form continuous current circuit, inductance L 1 releases energy, electric capacity C1 energy storage; That is, when PFC rectifier is electric capacity C1 energy storage, DC power supply DC, inductance L 1, diode D1, switching tube Q1, diode D3, electric capacity C1, switching tube Q2 form boost circuit.Due to switching tube Q2 conducting, therefore, the current potential of the negative pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
The third working method is: the first rectifying tube 21 high frequency chopping (switching tube Q3 high frequency chopping in Fig. 3 a, K switch 3 high frequency chopping in Fig. 4 a), switching tube Q1 high frequency chopping, switching tube Q2 conducting, and the first rectifying tube 21 (the switching tube Q3 high frequency chopping in Fig. 3 a, K switch 3 high frequency chopping in Fig. 4 a) and switching tube Q1 alternating chopper; When PFC rectifier is electric capacity C1 energy storage, DC power supply DC, inductance L 1, first rectifying tube 21 (the switching tube Q3 in Fig. 3 a, K switch 3 in Fig. 4 a), diode D1, diode D3, electric capacity C1, switching tube Q2 form a boost circuit, DC power supply DC, inductance L 1, diode D1, switching tube Q1, diode D3, electric capacity C1, switching tube Q2 form the 2nd boost circuit.And due to switching tube Q2 conducting, therefore, the current potential of the negative pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
Under the PFC rectifier provided when the embodiment of the present invention is operated in battery mode, and the positive pole of DC power supply DC is when connecting the PFC inductance in PFC rectifier, PFC rectifier is being the second bus capacitor, namely during electric capacity C1 energy storage, PFC inductance in the PFC rectifier that the embodiment of the present invention provides, when the ripple of the electric current namely in inductance L 1 is identical, during according to the first working method, the first rectifying tube 21 (switching tube Q3 in Fig. 3 a in Fig. 2 a, K switch 3 in Fig. 4 a) control signal that receives is Ctr1 in Fig. 5, the first rectifying tube 21 (switching tube Q3 in Fig. 3 a in Fig. 2 a, K switch 3 in Fig. 4 a) to cut wave frequency be f, and the first rectifying tube 21 conducting (the switching tube Q3 conducting in Fig. 3 a when Ctr1 is high level in Fig. 2 a, K switch 3 in Fig. 4 a closes), the first rectifying tube 21 when Ctr1 is low level in Fig. 2 a turns off that (the switching tube Q3 in Fig. 3 a turns off, K switch 3 in Fig. 4 a disconnects), according to the second working method, the control signal that switching tube Q1 receives is the Ctr2 in Fig. 5, and it is f that switching tube Q1 cuts wave frequency, and the switching tube Q1 conducting when Ctr2 is high level, when Ctr2 is low level, switching tube Q1 turns off, in the third working method, the first rectifying tube 21 (switching tube Q3 in Fig. 3 a in Fig. 2 a, K switch 3 in Fig. 4 a) control signal that receives is Ctr3 in Fig. 5, the first rectifying tube 21 (switching tube Q3 in Fig. 3 a in Fig. 2 a, K switch 3 in Fig. 4 a) to cut wave frequency be f/2, and the first rectifying tube 21 conducting (the switching tube Q3 conducting in Fig. 3 a when Ctr3 is high level in Fig. 2 a, K switch 3 in Fig. 4 a closes), when Ctr3 is low level, in Fig. 2 a, the first rectifying tube 21 turns off that (the switching tube Q3 in Fig. 3 a turns off, K switch 3 in Fig. 4 a disconnects), the control signal that switching tube Q1 receives is the Ctr4 in Fig. 5, it is f/2 that switching tube Q1 cuts wave frequency, and the switching tube Q1 conducting when Ctr4 is high level, when Ctr4 is low level, switching tube Q1 turns off, therefore, adopt the third working method can current ripples on PFC inductance identical, reduce switching frequency, thus reduction switching loss.Transverse axis t in Fig. 5 represents the time.
Due in the first working method tank circuit by DC power supply DC, inductance L 1, the first rectifying tube 21 (switching tube Q3 in Fig. 3 a in Fig. 2 a, K switch 3 in Fig. 4 a) form, and in the second working method tank circuit by DC power supply DC, inductance L 1, diode D1, switching tube Q1, switching tube Q2 is formed, therefore, tank circuit in the first working method is less than the tank circuit in the second working method, loop is less, conduction loss is also less, the efficiency of PFC rectifier is also higher, therefore, adopt the first working method can improve the efficiency of PFC rectifier.
Be the first bus capacitor under the PFC rectifier shown in Fig. 2 a, Fig. 3 a or Fig. 4 a is operated in battery mode, namely during negative busbar electric capacity (electric capacity C2) energy storage, the first rectifying tube 21 high frequency chopping (the switching tube Q3 high frequency chopping in the PFC rectifier shown in Fig. 3 a, K switch 3 high frequency chopping in Fig. 4 a) in PFC rectifier shown in Fig. 2 a, switching tube Q1 conducting, switching tube Q2 turns off; When the first rectifying tube 21 conducting (the switching tube Q3 conducting in Fig. 3 a, K switch in Fig. 4 a 3 close) in Fig. 2 a, electric current is through positive pole, PFC inductance (i.e. inductance L 1), first rectifying tube 21 (K switch 3 in switching tube Q3, Fig. 4 a in Fig. 3 a) of DC power supply DC, arrive the negative pole of DC power supply DC, form tank circuit, inductance L 1 energy storage; Now, the voltage of DC power supply DC negative pole is the voltage of voltage after diode D1 and the first continued flow tube 22 dividing potential drop of negative busbar output BUS-, and this voltage is less than the voltage of negative busbar output BUS-.When the first rectifying tube 21 in Fig. 2 a turns off (the switching tube Q3 shutoff in Fig. 3 a, the K switch 3 in Fig. 4 a disconnect), electric current is through the positive pole of DC power supply DC, inductance L 1, diode D1, switching tube Q1, electric capacity C2, the first continued flow tube 22, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 1 releases energy, electric capacity C2 energy storage; Now, due to the first continued flow tube 22 conducting, therefore, the current potential of the negative pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp; That is, when PFC rectifier is electric capacity C2 energy storage, the first rectifying tube 21 (K switch 3 in switching tube Q3, Fig. 4 a in Fig. 3 a) in DC power supply DC, inductance L 1, Fig. 2 a, diode D1, switching tube Q1, electric capacity C2, the first continued flow tube 22 form boost circuit.Therefore, under PFC rectifier shown in Fig. 2 a, Fig. 3 a and Fig. 4 a is operated in battery mode, be the first bus capacitor, namely negative busbar capacitance energy storage time, the amplitude of the saltus step of the current potential of the electrode (i.e. the negative pole of DC power supply) be connected with the first rectifying tube in DC power supply, be less than under PFC rectification circuit of the prior art is operated in battery mode, during for negative busbar capacitance energy storage, the amplitude of the saltus step of the current potential of the negative pole of DC power supply.
When Fig. 2 a, Fig. 3 a or the PFC rectifier shown in Fig. 4 a are operated under utility mode, PFC inductance, namely inductance L 1 is connected by the live wire L of K switch 1 with AC power AC, and K switch 2 disconnects.Be positive bus-bar electric capacity under the PFC rectifier shown in Fig. 2 a, Fig. 3 a or Fig. 4 a is operated in utility mode, namely during electric capacity C1 energy storage, Fig. 2 a, Fig. 3 a or the PFC rectifier shown in Fig. 4 a have three kinds of working methods.
In the first working method, the first rectifying tube 21 in Fig. 2 a disconnects (the switching tube Q3 disconnection in Fig. 3 a, the K switch 3 in Fig. 4 a disconnect), switching tube Q1 high frequency chopping; When switching tube Q1 conducting, electric current, through live wire L, inductance L 1, diode D1, the switching tube Q1 of AC power AC, arrives the zero line N of AC power AC, forms tank circuit, inductance L 1 energy storage; When switching tube Q1 turns off, electric current arrives the zero line N of AC power AC through the live wire L of AC power AC, inductance L 1, diode D1, diode D3, electric capacity C1, and form continuous current circuit, inductance L 1 releases energy, electric capacity C1 energy storage; That is, at the positive half period of the alternating voltage that AC power AC exports, AC power AC, inductance L 1, diode D1, switching tube Q1, diode D3, electric capacity C1 form boost circuit.
In the second working method, the first rectifying tube 21 high frequency chopping (the switching tube Q3 high frequency chopping in Fig. 3 a, K switch 3 high frequency chopping in Fig. 4 a) in Fig. 2 a, switching tube Q1 turn off; When the first rectifying tube 21 conducting (the switching tube Q3 conducting in Fig. 3 a, K switch 3 conducting in Fig. 4 a) in Fig. 2 a, first rectifying tube 21 (K switch 3 in switching tube Q3, Fig. 4 a in Fig. 3 a), the switching tube Q2 antiparallel body diode of electric current in the live wire L of AC power AC, inductance L 1, Fig. 2 a, arrive the zero line N of AC power AC, form tank circuit, inductance L 1 energy storage; When the first rectifying tube 21 in fig. 2 a turns off (the switching tube Q3 shutoff in Fig. 3 a, the K switch 3 in Fig. 4 a turn off), electric current arrives the zero line N of AC power AC through the live wire L of AC power AC, inductance L 1, diode D1, diode D3, electric capacity C1, form continuous current circuit, inductance L 1 releases energy, electric capacity C1 energy storage; That is, at the positive half period of the alternating voltage that AC power AC exports, the first rectifying tube 21 (K switch 3 in switching tube Q3, Fig. 4 a in Fig. 3 a) in AC power AC, inductance L 1, Fig. 2 a, diode D1, the antiparallel body diode of switching tube Q2, diode D3, electric capacity C1 form boost circuit.
In the third working method, the first rectifying tube 21 high frequency chopping (the switching tube Q3 high frequency chopping in Fig. 3 a, K switch 3 high frequency chopping in Fig. 4 a) in Fig. 2 a, switching tube Q1 high frequency chopping, and the first rectifying tube 21 (the switching tube Q3 high frequency chopping in Fig. 3 a, K switch 3 high frequency chopping in Fig. 4 a) in Fig. 2 a and switching tube Q1 alternating chopper, switching tube Q3 in Fig. 3 a and switching tube Q1 alternating chopper, the K switch 3 in Fig. 4 a and switching tube Q1 alternating chopper.At the positive half period of the alternating voltage that AC power AC exports, AC power AC, inductance L 1, diode D1, switching tube Q1, diode D3, electric capacity C1 form a boost circuit; The first rectifying tube 21 (K switch 3 in switching tube Q3, Fig. 4 a in Fig. 3 a) in AC power AC, inductance L 1, Fig. 2 a, diode D1, the antiparallel body diode of switching tube Q2, diode D3, electric capacity C1 form another boost circuit.
The PFC rectifier provided when the embodiment of the present invention is operated in the positive half period of the alternating voltage that AC power AC exports, at PFC inductance, namely when the ripple in inductance L 1 is identical, switch when adopting the third working method in PFC rectifier or the switching frequency of switching tube minimum, therefore, when adopting the third working method, the switching loss of PFC rectifier is minimum.
Be negative busbar electric capacity, i.e. electric capacity C2 energy storage under the PFC rectifier shown in Fig. 2 a is operated in utility mode, namely when the negative half-cycle of the alternating voltage that AC power AC exports, the first rectifying tube 21 conducting in Fig. 2 a, switching tube Q2 high frequency chopping; When switching tube Q2 conducting, electric current through zero line N, the switching tube Q2 of AC power AC, the first rectifying tube 21, inductance L 1, arrive the live wire L of AC power AC, form tank circuit, inductance L 1 energy storage; When switching tube Q2 turns off, electric current, through the zero line N of AC power AC, electric capacity C2, the first continued flow tube 22, first rectifying tube 21, inductance L 1, arrives the live wire L of AC power AC, and form continuous current circuit, inductance L 1 releases energy, electric capacity C2 energy storage; That is, at the negative half-cycle of the alternating voltage that AC power AC exports, AC power AC, switching tube Q2, electric capacity C2, the first continued flow tube 22, first rectifying tube 21, inductance L 1 form boost circuit.
PFC rectifier shown in Fig. 3 a is negative busbar electric capacity under being operated in utility mode, i.e. electric capacity C2 energy storage, namely when the negative half-cycle of the alternating voltage that AC power AC exports, the working method of this PFC rectifier is identical with the working method of the PFC rectifier shown in Fig. 2 a, its difference is only: the first rectifying tube 21 conducting in Fig. 2 a refers to that switching tube Q3 conducting in Fig. 3 a or switching tube Q3 turn off, when switching tube Q3 conducting in Fig. 3 a, switching tube Q3 and antiparallel body diode thereof are equivalent to the first rectifying tube 21 in Fig. 2 a; When the switching tube Q3 in Fig. 3 a turns off, the antiparallel body diode of switching tube Q3 is equivalent to the first rectifying tube 21 in Fig. 2 a.
PFC rectifier shown in Fig. 4 a is negative busbar electric capacity under being operated in utility mode, i.e. electric capacity C2 energy storage, namely when the negative half-cycle of the alternating voltage that AC power AC exports, the working method of this PFC rectifier is identical with the working method of the PFC rectifier shown in Fig. 2 a, its difference is only: the first rectifying tube 21 conducting in Fig. 2 a refers to that the K switch 3 in Fig. 4 a closes or K switch 3 disconnects, when the K switch 3 in Fig. 4 a closes, K switch 3 is equivalent to the first rectifying tube 21 in Fig. 2 a with the parallel-connection structure of diode D2; When the K switch 3 in Fig. 4 a disconnects, the diode D2 in parallel with K switch 3 is equivalent to the first rectifying tube 21 in Fig. 2 a.
Preferably, diode D1 in PFC rectifier as shown in Figure 2 a also can replace with the switching tube of inverse parallel body diode, or replace with the parallel-connection structure of switch and diode, after replacing, the structure of the PFC rectifier shown in Fig. 2 a as shown in Figure 6 a, in Fig. 6 a, second rectifying tube 23 can be the switching tube of inverse parallel body diode, also can be the parallel-connection structure of switch and diode.PFC rectifier shown in Fig. 6 a is negative busbar electric capacity under being operated in utility mode, and namely during electric capacity C2 energy storage, PFC rectifier has three kinds of working methods.
In the first working method, the first rectifying tube 21 conducting in Fig. 6 a, switching tube Q2 high frequency chopping, the second rectifying tube 23 turn off; At the negative half-cycle of the alternating voltage that AC power AC exports, AC power AC, switching tube Q2, electric capacity C2, the first continued flow tube 22, first rectifying tube 21, inductance L 1 form boost circuit.
In the second working method, the first rectifying tube 21 conducting in Fig. 6 a, switching tube Q2 shutoff, the second rectifying tube 23 high frequency chopping; At the negative half-cycle of the alternating voltage that AC power AC exports, the antiparallel body diode of AC power AC, switching tube Q1, the second rectifying tube 23, electric capacity C2, the first continued flow tube 22, first rectifying tube 21, inductance L 1 form boost circuit.Wherein, when the second rectifying tube 23 in Fig. 6 a is the switching tube of inverse parallel body diode, the second rectifying tube 23 high frequency chopping in Fig. 6 a refers to switching tube high frequency chopping; When the second rectifying tube 23 in Fig. 6 a is the parallel-connection structure of switch and diode, the second rectifying tube 23 high frequency chopping in Fig. 6 a refers to switch high-frequency copped wave.
In the third working method, the first rectifying tube 21 conducting in Fig. 6 a, switching tube Q2 high frequency chopping, the second rectifying tube 23 high frequency chopping; At the negative half-cycle of the alternating voltage that AC power AC exports, AC power AC, switching tube Q2, electric capacity C2, the first continued flow tube 22, first rectifying tube 21, inductance L 1 form a boost circuit; The antiparallel body diode of AC power AC, switching tube Q1, the second rectifying tube 23, electric capacity C2, the first continued flow tube 22, first rectifying tube 21, inductance L 1 form another boost circuit.
Under the PFC rectifier shown in Fig. 6 a is operated in utility mode, for negative busbar electric capacity, during i.e. electric capacity C2 energy storage (namely at the negative half-cycle of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Fig. 6 a, when the first rectifying tube 21 in Fig. 6 a is the switching tube of inverse parallel body diode, the first rectifying tube 21 conducting in Fig. 6 a refers to that switching tube conducting or switching tube turn off, when switching tube conducting, switching tube and antiparallel body diode thereof are equivalent to the first rectifying tube 21 in Fig. 6 a; When switching tube turns off, the antiparallel body diode of switching tube is equivalent to the first rectifying tube 21 in Fig. 6 a.When the first rectifying tube 21 in Fig. 6 a is the parallel-connection structure of switch and diode, the first rectifying tube 21 conducting in Fig. 6 a refers to that switch closes or switch disconnects, when the switch is closed, the parallel-connection structure of switch and diode is equivalent to the first rectifying tube 21 in Fig. 6 a; When the switch in Fig. 6 a disconnects, with first rectifying tube 21 of diode equivalent in Fig. 6 a of switch in parallel.
Under the PFC rectifier shown in Fig. 6 a is operated in utility mode, for negative busbar electric capacity, during i.e. electric capacity C2 energy storage (namely at the negative half-cycle of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Fig. 6 a, when the second rectifying tube 23 in Fig. 6 a is the switching tube of inverse parallel body diode, second rectifying tube 23 turns off and refers to that switching tube turns off, when the second rectifying tube 23 in Fig. 6 a is the parallel-connection structure of switch and diode, the second rectifying tube 23 turns off and refers to that switch disconnects.
Under the PFC rectifier shown in Fig. 6 a is operated in utility mode, for negative busbar electric capacity, during i.e. electric capacity C2 energy storage (namely at the negative half-cycle of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Fig. 6 a, when the second rectifying tube 23 in Fig. 6 a is the switching tube of inverse parallel body diode, second rectifying tube 23 high frequency chopping refers to switching tube high frequency chopping, when the second rectifying tube 23 in Fig. 6 a is the parallel-connection structure of switch and diode, the second rectifying tube 23 high frequency chopping refers to switch high-frequency copped wave.
Further, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides is as shown in Fig. 7 a, Fig. 8 a, Fig. 9 a; Wherein, the operation principle of the PFC rectifier shown in Fig. 7 a is identical with the operation principle of the PFC rectifier shown in Fig. 2 a, does not repeat them here; The operation principle of the PFC rectifier shown in Fig. 8 a is identical with the operation principle of the PFC rectifier shown in Fig. 3 a, does not repeat them here; The operation principle of the PFC rectifier shown in Fig. 9 a is identical with the operation principle of the PFC rectifier shown in Fig. 4 a, does not repeat them here.
When Fig. 7 a, Fig. 8 a or the PFC rectifier shown in Fig. 9 a are negative busbar capacitance energy storage under being operated in battery mode, at PFC inductance, in the process of i.e. inductance L 1 energy storage, switching tube Q1 conducting, the voltage of the negative pole of DC power supply DC is the voltage of voltage after the junction capacitance of diode D1 and the junction capacitance dividing potential drop of diode D4 of negative busbar output BUS-, further, the junction capacitance of diode D4 is larger, and the voltage of the negative pole of DC power supply DC is more close to the voltage of negative busbar output BUS-.
Therefore, preferably, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides also comprises the first electric capacity, i.e. electric capacity C5, first electric capacity is in parallel with the first continued flow tube, and now, the PFC rectifier that the embodiment of the present invention provides is as shown in Figure 10 a, Figure 11 a, Figure 12 a; Wherein, the operation principle of the PFC rectifier shown in Figure 10 a is identical with the operation principle of the PFC rectifier shown in Fig. 2 a, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 11 a is identical with the operation principle of the PFC rectifier shown in Fig. 3 a, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 12 a is identical with the operation principle of the PFC rectifier shown in Fig. 4 a, does not repeat them here.
In Figure 10 a, Figure 11 a and Figure 12 a, two ends due to diode D4 are in parallel electric capacity C5, this is equivalent to the junction capacitance increasing diode D4, therefore, when Figure 10 a, Figure 11 a or the PFC rectifier shown in Figure 12 a are negative busbar capacitance energy storage under being operated in battery mode, at PFC inductance, i.e. in the process of inductance L 1 energy storage, the voltage of the negative pole of DC power supply DC is more close to the voltage of negative busbar output BUS-.
Alternatively, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides also comprises the first switch, i.e. K switch 3, first switch is in parallel with the first continued flow tube, now, the PFC rectifier that provides of the embodiment of the present invention is as shown in Figure 13 a, Figure 14 a, Figure 15 a.The first switch in Figure 13 a, Figure 14 a or Figure 15 a, namely K switch 3 disconnects when PFC rectifier is operated in utility mode, and now, the first continued flow tube is equivalent to a diode, the first switch in Figure 13 a, Figure 14 a or Figure 15 a, namely K switch 3 is the positive bus-bar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, and namely disconnect during electric capacity C1 energy storage, now, the first continued flow tube is equivalent to a diode, Figure 13 a, the first switch in Figure 14 a or Figure 15 a, namely K switch 3 is the negative busbar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, PFC inductance in the process of i.e. electric capacity C2 energy storage, namely disconnect when inductance L 1 releases energy or close, now due to Figure 13 a, Figure 14 a or the PFC rectifier shown in Figure 15 a are the negative busbar electric capacity in PFC rectifier under being operated in battery mode, PFC inductance in the process of i.e. electric capacity C2 energy storage, namely when inductance L 1 releases energy, due to diode D4 conducting, therefore, the current potential of the negative pole of DC power supply DC equals the voltage of negative busbar output BUS-.The first switch in Figure 13 a, Figure 14 a or Figure 15 a, namely K switch 3 is the negative busbar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, PFC inductance in the process of i.e. electric capacity C2 energy storage, namely closed during inductance L 1 stored energy, now, the current potential of the negative pole of DC power supply DC equals the voltage of negative busbar output BUS-.
Therefore, under the PFC rectifier shown in Figure 13 a, Figure 14 a and Figure 15 a is operated in battery mode, during for negative busbar capacitance energy storage, the current potential of the negative pole of DC power supply DC can not saltus step.
The operation principle of the circuit in the PFC rectifier shown in Figure 13 a except switch K3 is identical with the operation principle of the PFC rectifier shown in Fig. 7 a, does not repeat them here; The operation principle of the circuit in the PFC rectifier shown in Figure 14 a except switch K3 is identical with the operation principle of the PFC rectifier shown in Fig. 8 a, does not repeat them here; The operation principle of the circuit in the PFC rectifier shown in Figure 15 a except switch K3 is identical with the operation principle of the PFC rectifier shown in Fig. 9 a, does not repeat them here.
When the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is the switching tube of inverse parallel body diode, the PFC rectifier that the embodiment of the present invention provides is as shown in Figure 16 a, Figure 17 a, Figure 18 a.Switching tube Q3 in Figure 16 a, Figure 17 a, the PFC rectifier shown in Figure 18 a and antiparallel body diode thereof are equivalent to diode D4 in Figure 13 a, Figure 14 a and Figure 15 a structure in parallel with K switch 3; Wherein, the antiparallel body diode of switching tube Q3 is equivalent to diode D4, and switching tube Q3 is equivalent to K switch 3.The operation principle of the PFC rectifier shown in Figure 16 a is identical with the operation principle of the PFC rectifier shown in Figure 13 a, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 17 a is identical with the operation principle of the PFC rectifier shown in Figure 14 a, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 18 a is identical with the operation principle of the PFC rectifier shown in Figure 15 a, does not repeat them here.
PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is Single Phase PFC Rectifier, and when the negative pole that PFC rectifier is operated in DC power supply DC under battery mode connects the PFC inductance in PFC rectifier, the PFC rectifier that the embodiment of the present invention provides, as Fig. 2 b, shown in Fig. 3 b or Fig. 4 b, diode D2 and the first rectifying tube 21 (or the switching tube Q3 in Fig. 3 a, or the parallel-connection structure of K switch 3 in Fig. 4 a and diode D1) formation first branch road of connecting, switching tube Q1 and switching tube Q2 series connection formation second branch road, PFC inductance, namely one end of inductance L 1 connects diode D2 and the first rectifying tube 21 (or the switching tube Q3 in Fig. 3 a, or the parallel-connection structure of K switch 3 in Fig. 4 a and diode D1) tie point that is connected, first branch road is connected positive bus-bar electric capacity with the one end after the second branch circuit parallel connection by the first continued flow tube 22, i.e. one end of electric capacity C1, and one end that the first continued flow tube 22 is connected with electric capacity C1 is the positive bus-bar output BUS+ of PFC rectifier, first branch road is connected negative busbar electric capacity with the other end after the second branch circuit parallel connection by diode D4, i.e. one end of electric capacity C2, the other end of electric capacity C2 connects the other end of electric capacity C1, and one end that diode D4 is connected with electric capacity C2 is the negative busbar output BUS-of PFC rectifier, the voltage of the tie point that electric capacity C1 is connected with electric capacity C2 is the voltage on the zero line N in AC power AC.
When Fig. 2 b, Fig. 3 b or the PFC rectifier shown in Fig. 4 b are operated under battery mode, PFC inductance, namely inductance L 1 is connected by the negative pole of K switch 1 with DC power supply DC, and K switch 2 closes.Be the second bus capacitor under the PFC rectifier shown in Fig. 2 b, Fig. 3 b or Fig. 4 b is operated in battery mode, namely during electric capacity C2 (negative busbar electric capacity) energy storage, Fig. 2 b, Fig. 3 b or the PFC rectifier shown in Fig. 4 b have three kinds of working methods.
The first working method is: the first rectifying tube 21 high frequency chopping (the switching tube Q3 high frequency chopping in Fig. 3 b, K switch 3 high frequency chopping in Fig. 4 b) in Fig. 2 b, switching tube Q1 conducting, and switching tube Q2 turns off; When the first rectifying tube 21 conducting (switching tube Q3 conducting in Fig. 3 b, K switch 3 in Fig. 4 b closes) time, electric current is through positive pole, first rectifying tube 21 (the switching tube Q3 in Fig. 3 b of DC power supply DC, K switch 3 in Fig. 4 b), PFC inductance (i.e. inductance L 1), arrive the negative pole of DC power supply DC, form tank circuit, inductance L 1 energy storage; When the first rectifying tube 21 turns off, (the switching tube Q3 in Fig. 3 b turns off, K switch 3 in Fig. 4 b disconnects) time, electric current is through positive pole, switching tube Q1, electric capacity C2, diode D4, diode D2, the inductance L 1 of DC power supply DC, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 1 releases energy, electric capacity C2 energy storage; That is, when PFC rectifier is electric capacity C2 energy storage, DC power supply DC, inductance L 1, first rectifying tube 21 (the switching tube Q3 in Fig. 3 b, the K switch 3 in Fig. 4 b), switching tube Q1, electric capacity C2, diode D4, diode D2 form boost circuit.Due to switching tube Q1 conducting, therefore, the current potential of the positive pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
The second working method is: the first rectifying tube 21 turns off (the switching tube Q3 in Fig. 3 b turns off, and the K switch 3 in Fig. 4 b disconnects), switching tube Q1 conducting, switching tube Q2 high frequency chopping; When switching tube Q2 conducting, electric current, through positive pole, switching tube Q1, switching tube Q2, diode D2, the inductance L 1 of DC power supply DC, arrives the negative pole of DC power supply DC, forms tank circuit, inductance L 1 energy storage; When switching tube Q2 turns off, electric current, through positive pole, switching tube Q1, electric capacity C2, diode D4, diode D2, the inductance L 1 of DC power supply DC, arrives the negative pole of DC power supply DC, and form continuous current circuit, inductance L 1 releases energy, electric capacity C2 energy storage; That is, when PFC rectifier is electric capacity C2 energy storage, DC power supply DC, inductance L 1, switching tube Q1, switching tube Q2, electric capacity C2, diode D4, diode D2 form boost circuit.Due to switching tube Q1 conducting, therefore, the current potential of the positive pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
The third working method is: the first rectifying tube 21 high frequency chopping (switching tube Q3 high frequency chopping in Fig. 3 b, K switch 3 high frequency chopping in Fig. 4 b), switching tube Q1 conducting, switching tube Q2 high frequency chopping, and the first rectifying tube 21 (the switching tube Q3 high frequency chopping in Fig. 3 b, K switch 3 high frequency chopping in Fig. 4 b) and switching tube Q1 alternating chopper; When PFC rectifier is electric capacity C2 energy storage, DC power supply DC, inductance L 1, first rectifying tube 21 (the switching tube Q3 in Fig. 3 b, K switch 3 in Fig. 4 b), switching tube Q1, electric capacity C2, diode D4, diode D2 form a boost circuit, DC power supply DC, inductance L 1, switching tube Q1, switching tube Q2, electric capacity C2, diode D4, diode D2 form the 2nd boost circuit.And due to switching tube Q1 conducting, therefore, the current potential of the positive pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
When under the PFC rectifier that the embodiment of the present invention provides is operated in battery mode and the negative pole of DC power supply DC connects the PFC inductance in PFC rectifier time, PFC rectifier is being the second bus capacitor, namely during electric capacity C2 energy storage, PFC inductance in the PFC rectifier that the embodiment of the present invention provides, when the ripple of the electric current namely in inductance L 1 is identical, switch when adopting the third working method or the switching frequency of switching tube minimum, therefore, when adopting the third working method, the switching loss of PFC rectifier is minimum.
Due in the first working method tank circuit by DC power supply DC, inductance L 1, the first rectifying tube 21 (switching tube Q3 in Fig. 3 b in Fig. 2 b, K switch 3 in Fig. 4 b) form, and in the second working method tank circuit by DC power supply DC, switching tube Q1, switching tube Q2, diode D2, inductance L 1 is formed, therefore, tank circuit in the first working method is less than the tank circuit in the second working method, loop is less, conduction loss is also less, the efficiency of PFC rectifier is also higher, therefore, adopt the first working method can improve the efficiency of PFC rectifier.
Be the first bus capacitor under the PFC rectifier shown in Fig. 2 b, Fig. 3 b or Fig. 4 b is operated in battery mode, namely during positive bus-bar electric capacity (electric capacity C1) energy storage, the first rectifying tube 21 high frequency chopping (the switching tube Q3 high frequency chopping in the PFC rectifier shown in Fig. 3 b, K switch 3 high frequency chopping in Fig. 4 b) in PFC rectifier shown in Fig. 2 b, switching tube Q1 turn off, switching tube Q2 conducting; When the first rectifying tube 21 conducting (the switching tube Q3 conducting in Fig. 3 b, K switch in Fig. 4 b 3 close) in Fig. 2 b, electric current is through positive pole, the first rectifying tube 21 (K switch 3 in switching tube Q3, Fig. 4 b in Fig. 3 b), the PFC inductance (i.e. inductance L 1) of DC power supply DC, arrive the negative pole of DC power supply DC, form tank circuit, inductance L 1 energy storage; Now, the voltage of DC power supply DC negative pole is the voltage of voltage after diode D2 and the first continued flow tube 22 dividing potential drop of positive bus-bar output BUS+, and this voltage is less than the voltage of positive bus-bar output BUS+.When the first rectifying tube 21 in Fig. 2 b turns off (the switching tube Q3 shutoff in Fig. 3 b, the K switch 3 in Fig. 4 b disconnect), electric current is through the positive pole of DC power supply DC, the first continued flow tube 22, electric capacity C1, switching tube Q2, diode D2, inductance L 1, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 1 releases energy, electric capacity C1 energy storage; Now, due to the first continued flow tube 22 conducting, therefore, the current potential of the negative pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp; That is, when PFC rectifier is electric capacity C1 energy storage, the first rectifying tube 21 (K switch 3 in switching tube Q3, Fig. 4 b in Fig. 3 b) in DC power supply DC, inductance L 1, Fig. 2 b, the first continued flow tube 22, electric capacity C1, switching tube Q2, diode D2 form boost circuit.Therefore, under the PFC rectifier that the embodiment of the present invention provides is operated in battery mode, be the first bus capacitor, namely positive bus-bar capacitance energy storage time, the amplitude of the saltus step of the current potential of the electrode (i.e. the positive pole of DC power supply) be connected with the first rectifying tube in DC power supply, be less than under PFC rectification circuit of the prior art is operated in battery mode, during for positive bus-bar capacitance energy storage, the amplitude of the saltus step of the current potential of the positive pole of DC power supply.
When Fig. 2 b, Fig. 3 b or the PFC rectifier shown in Fig. 4 b are operated under utility mode, PFC inductance, namely inductance L 1 is connected by the live wire L of K switch 1 with AC power AC, and K switch 2 disconnects.Be negative busbar electric capacity under the PFC rectifier shown in Fig. 2 b, Fig. 3 b or Fig. 4 b is operated in utility mode, namely during electric capacity C2 energy storage, Fig. 2 b, Fig. 3 b or the PFC rectifier shown in Fig. 4 b have three kinds of working methods.
In the first working method, the first rectifying tube 21 in Fig. 2 b disconnects (the switching tube Q3 disconnection in Fig. 3 b, the K switch 3 in Fig. 4 b disconnect), switching tube Q2 high frequency chopping; When switching tube Q1 conducting, electric current, through zero line N, switching tube Q2, diode D2, the inductance L 1 of AC power AC, arrives the live wire L of AC power AC, forms tank circuit, inductance L 1 energy storage; When switching tube Q2 turns off, electric current arrives the live wire L of AC power AC through zero line N, the electric capacity C2 of AC power AC, diode D4, diode D2, inductance L 1, and form continuous current circuit, inductance L 1 releases energy, electric capacity C2 energy storage; That is, at the negative half-cycle of the alternating voltage that AC power AC exports, AC power AC, switching tube Q2, diode D2, inductance L 1, electric capacity C2, diode D4 form boost circuit.
In the second working method, the first rectifying tube 21 high frequency chopping (the switching tube Q3 high frequency chopping in Fig. 3 b, K switch 3 high frequency chopping in Fig. 4 b) in Fig. 2 b, switching tube Q2 turn off; When the first rectifying tube 21 conducting (the switching tube Q3 conducting in Fig. 3 b, K switch 3 conducting in Fig. 4 b) in Fig. 2 b, first rectifying tube 21 (K switch 3 in switching tube Q3, Fig. 4 b in Fig. 3 b), the inductance L 1 of electric current in the zero line N of AC power AC, the antiparallel body diode of switching tube Q1, Fig. 2 b, arrive the live wire L of AC power AC, form tank circuit, inductance L 1 energy storage; When the first rectifying tube 21 in figure 2b turns off (the switching tube Q3 shutoff in Fig. 3 b, the K switch 3 in Fig. 4 b turn off), electric current arrives the live wire L of AC power AC through zero line N, the electric capacity C2 of AC power AC, diode D4, diode D2, inductance L 1, form continuous current circuit, inductance L 1 releases energy, electric capacity C2 energy storage; That is, at the negative half-cycle of the alternating voltage that AC power AC exports, the first rectifying tube 21 (K switch 3 in switching tube Q3, Fig. 4 b in Fig. 3 b) in AC power AC, the antiparallel body diode of switching tube Q1, Fig. 2 b, inductance L 1, electric capacity C2, diode D4, diode D2 form boost circuit.
In the third working method, the first rectifying tube 21 high frequency chopping (the switching tube Q3 high frequency chopping in Fig. 3 b, K switch 3 high frequency chopping in Fig. 4 b) in Fig. 2 b, switching tube Q2 high frequency chopping, and the first rectifying tube 21 (the switching tube Q3 high frequency chopping in Fig. 3 b, K switch 3 high frequency chopping in Fig. 4 b) in Fig. 2 b and switching tube Q2 alternating chopper, switching tube Q3 in Fig. 3 a and switching tube Q1 alternating chopper, the K switch 3 in Fig. 4 a and switching tube Q1 alternating chopper.At the negative half-cycle of the alternating voltage that AC power AC exports, AC power AC, switching tube Q2, diode D2, inductance L 1, electric capacity C2, diode D4 form a boost circuit; The first rectifying tube 21 (K switch 3 in switching tube Q3, Fig. 4 b in Fig. 3 b) in AC power AC, the antiparallel body diode of switching tube Q1, Fig. 2 b, inductance L 1, electric capacity C2, diode D4, diode D2 form another boost circuit.
The PFC rectifier provided when the embodiment of the present invention is operated in the negative half-cycle of the alternating voltage that AC power AC exports, at PFC inductance, namely when the ripple in inductance L 1 is identical, switch when adopting the third working method in PFC rectifier or the switching frequency of switching tube minimum, therefore, when adopting the third working method, the switching loss of PFC rectifier is minimum.
Be positive bus-bar electric capacity, i.e. electric capacity C1 energy storage under the PFC rectifier shown in Fig. 2 b is operated in utility mode, namely when the positive half period of the alternating voltage that AC power AC exports, the first rectifying tube 21 conducting in Fig. 2 b, switching tube Q1 high frequency chopping; When switching tube Q1 conducting, electric current through the live wire L of AC power AC, inductance L 1, first rectifying tube 21, switching tube Q1, arrive the zero line N of AC power AC, form tank circuit, inductance L 1 energy storage; When switching tube Q1 turns off, electric current is through the live wire L of AC power AC, and inductance L 1, first rectifying tube 21, first continued flow tube 22, electric capacity C1, arrive the zero line N of AC power AC, and form continuous current circuit, inductance L 1 releases energy, electric capacity C1 energy storage; That is, at the positive half period of the alternating voltage that AC power AC exports, AC power AC, inductance L 1, first rectifying tube 21, switching tube Q1, the first continued flow tube 22, electric capacity C1 form boost circuit.
PFC rectifier shown in Fig. 3 b is positive bus-bar electric capacity under being operated in utility mode, i.e. electric capacity C1 energy storage, namely when the positive half period of the alternating voltage that AC power AC exports, the working method of this PFC rectifier is identical with the working method of the PFC rectifier shown in Fig. 2 b, its difference is only: the first rectifying tube 21 conducting in Fig. 2 b refers to that switching tube Q3 conducting in Fig. 3 b or switching tube Q3 turn off, when switching tube Q3 conducting in Fig. 3 b, switching tube Q3 and antiparallel body diode thereof are equivalent to the first rectifying tube 21 in Fig. 2 b; When the switching tube Q3 in Fig. 3 b turns off, the antiparallel body diode of switching tube Q3 is equivalent to the first rectifying tube 21 in Fig. 2 b.
PFC rectifier shown in Fig. 4 b is positive bus-bar electric capacity under being operated in utility mode, i.e. electric capacity C1 energy storage, namely when the positive half period of the alternating voltage that AC power AC exports, the working method of this PFC rectifier is identical with the working method of the PFC rectifier shown in Fig. 2 b, its difference is only: the first rectifying tube 21 conducting in Fig. 2 b refers to that the K switch 3 in Fig. 4 b closes or K switch 3 disconnects, when the K switch 3 in Fig. 4 b closes, K switch 3 is equivalent to the first rectifying tube 21 in Fig. 2 b with the parallel-connection structure of diode D1; When the K switch 3 in Fig. 4 b disconnects, the diode D1 in parallel with K switch 3 is equivalent to the first rectifying tube 21 in Fig. 2 b.
Preferably, diode D2 in PFC rectifier as shown in Figure 2 b also can replace with the switching tube of inverse parallel body diode, or replace with the parallel-connection structure of switch and diode, after replacing, the structure of the PFC rectifier shown in Fig. 2 b as shown in Figure 6 b, in figure 6b, second rectifying tube 23 can be the switching tube of inverse parallel body diode, also can be the parallel-connection structure of switch and diode.PFC rectifier shown in Fig. 6 b is positive bus-bar electric capacity under being operated in utility mode, and namely during electric capacity C1 energy storage, PFC rectifier has three kinds of working methods.
In the first working method, the first rectifying tube 21 conducting in Fig. 6 b, switching tube Q1 high frequency chopping, the second rectifying tube 23 turn off; At the positive half period of the alternating voltage that AC power AC exports, AC power AC, inductance L 1, first rectifying tube 21, switching tube Q1, the first continued flow tube 22, electric capacity C1 form boost circuit.
In the second working method, the first rectifying tube 21 conducting in Fig. 6 b, switching tube Q1 shutoff, the second rectifying tube 23 high frequency chopping; At the positive half period of the alternating voltage that AC power AC exports, the antiparallel body diode of AC power AC, inductance L 1, second rectifying tube 23, switching tube Q2, the first rectifying tube 21, first continued flow tube 22, electric capacity C1 form boost circuit.Wherein, when the second rectifying tube 23 in Fig. 6 b is the switching tube of inverse parallel body diode, the second rectifying tube 23 high frequency chopping in Fig. 6 b refers to switching tube high frequency chopping; When the second rectifying tube 23 in Fig. 6 b is the parallel-connection structure of switch and diode, the second rectifying tube 23 high frequency chopping in Fig. 6 b refers to switch high-frequency copped wave.
In the third working method, the first rectifying tube 21 conducting in Fig. 6 b, switching tube Q1 high frequency chopping, the second rectifying tube 23 high frequency chopping; At the positive half period of the alternating voltage that AC power AC exports, AC power AC, inductance L 1, first rectifying tube 21, switching tube Q1, the first continued flow tube 22, electric capacity C1 form a boost circuit; The antiparallel body diode of AC power AC, inductance L 1, second rectifying tube 23, switching tube Q2, the first rectifying tube 21, first continued flow tube 22, electric capacity C1 form another boost circuit.
Under the PFC rectifier shown in Fig. 6 b is operated in utility mode, for positive bus-bar electric capacity, during i.e. electric capacity C1 energy storage (namely at the positive half period of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Fig. 6 b, when the first rectifying tube 21 in Fig. 6 b is the switching tube of inverse parallel body diode, the first rectifying tube 21 conducting in Fig. 6 b refers to that switching tube conducting or switching tube turn off, when switching tube conducting, switching tube and antiparallel body diode thereof are equivalent to the first rectifying tube 21 in Fig. 6 b; When switching tube turns off, the antiparallel body diode of switching tube is equivalent to the first rectifying tube 21 in Fig. 6 b.When the first rectifying tube 21 in Fig. 6 b is the parallel-connection structure of switch and diode, the first rectifying tube 21 conducting in Fig. 6 b refers to that switch closes or switch disconnects, when the switch is closed, the parallel-connection structure of switch and diode is equivalent to the first rectifying tube 21 in Fig. 6 b; When the switch in Fig. 6 b disconnects, with first rectifying tube 21 of diode equivalent in Fig. 6 a of switch in parallel.
Under the PFC rectifier shown in Fig. 6 b is operated in utility mode, for positive bus-bar electric capacity, during i.e. electric capacity C1 energy storage (namely at the positive half period of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Fig. 6 b, when the second rectifying tube 23 in Fig. 6 b is the switching tube of inverse parallel body diode, second rectifying tube 23 turns off and refers to that switching tube turns off, when the second rectifying tube 23 in Fig. 6 b is the parallel-connection structure of switch and diode, the second rectifying tube 23 turns off and refers to that switch disconnects.
Under the PFC rectifier shown in Fig. 6 b is operated in utility mode, for positive bus-bar electric capacity, during i.e. electric capacity C1 energy storage (namely at the positive half period of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Fig. 6 b, when the second rectifying tube 23 in Fig. 6 b is the switching tube of inverse parallel body diode, second rectifying tube 23 high frequency chopping refers to switching tube high frequency chopping, when the second rectifying tube 23 in Fig. 6 b is the parallel-connection structure of switch and diode, the second rectifying tube 23 high frequency chopping refers to switch high-frequency copped wave.
Further, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides is as shown in Fig. 7 b, Fig. 8 b, Fig. 9 b; Wherein, the operation principle of the PFC rectifier shown in Fig. 7 b is identical with the operation principle of the PFC rectifier shown in Fig. 2 b, does not repeat them here; The operation principle of the PFC rectifier shown in Fig. 8 b is identical with the operation principle of the PFC rectifier shown in Fig. 3 b, does not repeat them here; The operation principle of the PFC rectifier shown in Fig. 9 b is identical with the operation principle of the PFC rectifier shown in Fig. 4 b, does not repeat them here.
When Fig. 7 b, Fig. 8 b or the PFC rectifier shown in Fig. 9 b are positive bus-bar capacitance energy storage under being operated in battery mode, at PFC inductance, in the process of i.e. inductance L 1 energy storage, switching tube Q2 conducting, the voltage of the positive pole of DC power supply DC is the voltage of voltage after the junction capacitance of diode D3 and the junction capacitance dividing potential drop of diode D2 of positive bus-bar output BUS+, further, the junction capacitance of diode D3 is larger, and the voltage of the positive pole of DC power supply DC is more close to the voltage of positive bus-bar output BUS+.
Therefore, preferably, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides also comprises the first electric capacity, i.e. electric capacity C5, first electric capacity is in parallel with the first continued flow tube, and now, the PFC rectifier that the embodiment of the present invention provides is as shown in Figure 10 b, Figure 11 b, Figure 12 b; Wherein, the operation principle of the PFC rectifier shown in Figure 10 b is identical with the operation principle of the PFC rectifier shown in Fig. 2 b, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 11 b is identical with the operation principle of the PFC rectifier shown in Fig. 3 b, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 12 b is identical with the operation principle of the PFC rectifier shown in Fig. 4 b, does not repeat them here.
In Figure 10 b, Figure 11 b and Figure 12 b, two ends due to diode D3 are in parallel electric capacity C5, this is equivalent to the junction capacitance increasing diode D3, therefore, when Figure 10 b, Figure 11 b or the PFC rectifier shown in Figure 12 b are positive bus-bar capacitance energy storage under being operated in battery mode, at PFC inductance, i.e. in the process of inductance L 1 energy storage, the voltage of the positive pole of DC power supply DC is more close to the voltage of positive bus-bar output BUS+.
Alternatively, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides also comprises the first switch, i.e. K switch 3, first switch is in parallel with the first continued flow tube, now, the PFC rectifier that provides of the embodiment of the present invention is as shown in Figure 13 b, Figure 14 b, Figure 15 b.The first switch in Figure 13 b, Figure 14 b or Figure 15 b, namely K switch 3 disconnects when PFC rectifier is operated in utility mode, and now, the first continued flow tube is equivalent to a diode, the first switch in Figure 13 b, Figure 14 b or Figure 15 b, namely K switch 3 is the negative busbar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, and namely disconnect during electric capacity C2 energy storage, now, the first continued flow tube is equivalent to a diode, Figure 13 b, the first switch in Figure 14 b or Figure 15 b, namely K switch 3 is the positive bus-bar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, PFC inductance in the process of i.e. electric capacity C1 energy storage, namely disconnect when inductance L 1 releases energy or close, now, due to Figure 13 b, Figure 14 b or the PFC rectifier shown in Figure 15 b are the positive bus-bar electric capacity in PFC rectifier under being operated in battery mode, PFC inductance in the process of i.e. electric capacity C1 energy storage, namely when inductance L 1 releases energy, due to diode D3 conducting, therefore, the current potential of the positive pole of DC power supply DC equals the voltage of positive bus-bar output BUS+.The first switch in Figure 13 b, Figure 14 b or Figure 15 b, namely K switch 3 is the positive bus-bar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, PFC inductance in the process of i.e. electric capacity C1 energy storage, namely closed during inductance L 1 stored energy, now, the current potential of the positive pole of DC power supply DC equals the voltage of positive bus-bar output BUS+.
Therefore, under the PFC rectifier shown in Figure 13 b, Figure 14 b and Figure 15 b is operated in battery mode, during for positive bus-bar capacitance energy storage, the current potential of the positive pole of DC power supply DC can not saltus step.
The operation principle of the circuit in the PFC rectifier shown in Figure 13 b except switch K3 is identical with the operation principle of the PFC rectifier shown in Fig. 7 b, does not repeat them here; The operation principle of the circuit in the PFC rectifier shown in Figure 14 b except switch K3 is identical with the operation principle of the PFC rectifier shown in Fig. 8 b, does not repeat them here; The operation principle of the circuit in the PFC rectifier shown in Figure 15 b except switch K3 is identical with the operation principle of the PFC rectifier shown in Fig. 9 b, does not repeat them here.
When the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is the switching tube of inverse parallel body diode, the PFC rectifier that the embodiment of the present invention provides is as shown in Figure 16 b, Figure 17 b, Figure 18 b.Switching tube Q3 in Figure 16 b, Figure 17 b, the PFC rectifier shown in Figure 18 b and antiparallel body diode thereof are equivalent to diode D3 in Figure 13 b, Figure 14 b and Figure 15 b structure in parallel with K switch 3; Wherein, the antiparallel body diode of switching tube Q3 is equivalent to diode D3, and switching tube Q3 is equivalent to K switch 3.The operation principle of the PFC rectifier shown in Figure 16 b is identical with the operation principle of the PFC rectifier shown in Figure 13 b, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 17 b is identical with the operation principle of the PFC rectifier shown in Figure 14 b, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 18 b is identical with the operation principle of the PFC rectifier shown in Figure 15 b, does not repeat them here.
Alternatively, the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides can also be heterogeneous PFC rectification circuit, such as, and two-phase PFC rectification circuit, three-phase PFC rectification circuit etc.Further, when the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is n phase PFC rectification circuit, the PFC rectifier that the embodiment of the present invention provides comprises n the first rectifying tube.Below, the PFC rectification circuit in the PFC rectifier only provided for the embodiment of the present invention is described for three-phase PFC rectification circuit.
When when the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is three-phase PFC rectification circuit and this PFC rectifier is operated under battery mode, the positive pole of DC power supply is connected with PFC inductance, the PFC rectifier that the embodiment of the present invention provides as shown in figure 19a, comprises PFC rectification circuit, each first rectifying tube in this PFC rectification circuit is the switching tube of inverse parallel body diode, namely the first rectifying tube 181A is the switching tube Q6A of inverse parallel body diode, the switching tube Q6C (shown in Figure 20 a) of the first rectifying tube 181B to be the switching tube Q6B of inverse parallel body diode and the first rectifying tube 181C be inverse parallel body diode, or each first rectifying tube in this PFC rectification circuit is parallel-connection structure (in Figure 21 a parallel-connection structure of the first rectifying tube 181A to be K switch 5A be diode D6A of switch and diode, the parallel-connection structure of the first rectifying tube 181B to be K switch 5B be diode D6B, the parallel-connection structure of the first rectifying tube 181C to be K switch 5C be diode D6C), wherein, each first rectifying tube is the rectifying tube be connected with DC power supply DC in two rectifying tubes of PFC rectification circuit when being operated under battery mode in PFC rectification circuit, wherein, time under battery mode, DC power supply DC is PFC rectifier power supply.The direct-to-ground capacitance of the positive pole of DC power supply DC is the direct-to-ground capacitance of the negative pole of electric capacity C8, DC power supply DC is electric capacity C7.
When PFC rectifier is operated under battery mode, in Figure 19 a, Figure 20 a or Figure 21 a, the positive pole of DC power supply DC connects the PFC inductance in PFC rectifier, i.e. inductance L 2A, inductance L 2B, inductance L 2C.
At Figure 19 a, in Figure 20 a or Figure 21 a, the PFC rectifier that the embodiment of the present invention provides comprises: the first rectifying tube 181A (the switching tube Q6A in Figure 20 a in diode D5A and Figure 19 a, the parallel-connection structure of the K switch 5A in Figure 21 a and diode D6A) formation the 3rd branch road of connecting, the first rectifying tube 181B (switching tube Q6B in Figure 20 a in diode D5B and Figure 19 a, the parallel-connection structure of the K switch 5B in Figure 21 a and diode D6B) formation the 4th branch road of connecting, the first rectifying tube 181C (switching tube Q6C in Figure 20 a in diode D5C and Figure 19 a, the parallel-connection structure of the K switch 5C in Figure 21 a and diode D6C) formation the 5th branch road of connecting, switching tube Q4 and switching tube Q5 series connection formation the 6th branch road (tie point that switching tube Q4 is connected with switching tube Q5 is M point), A phase PFC inductance, namely one end of inductance L 2A connects the first rectifying tube 181A (the switching tube Q6A in Figure 20 a in diode D5A and Figure 19 a, the parallel-connection structure of the K switch 5A in Figure 21 a and diode D6A) tie point that is connected, B phase PFC inductance, namely one end of inductance L 2B connects the first rectifying tube 181B (the switching tube Q6B in Figure 20 a in diode D5B and Figure 19 a, the parallel-connection structure of the K switch 5B in Figure 21 a and diode D6B) tie point that is connected, C phase PFC inductance, namely one end of inductance L 2C connects the first rectifying tube 181C (the switching tube Q6C in Figure 20 a in diode D5C and Figure 19 a, the parallel-connection structure of the K switch 5C in Figure 21 a and diode D6C) tie point that is connected, 3rd branch road, the 4th branch road, the 5th branch road are connected positive bus-bar electric capacity with the one end after the 6th branch circuit parallel connection by diode D7, i.e. one end of electric capacity C5, and one end that diode D7 is connected with electric capacity C5 is the positive bus-bar output BUS+ of three-phase PFC rectification circuit, 3rd branch road, the 4th branch road, the 5th branch road are connected negative busbar electric capacity with the other end after the 6th branch circuit parallel connection by the first continued flow tube 182, i.e. one end of electric capacity C6, the other end of electric capacity C6 connects the other end of electric capacity C5, and one end that the first continued flow tube 182 is connected with electric capacity C6 is the negative busbar output BUS-of three-phase PFC rectification circuit, the voltage of the tie point that electric capacity C5 is connected with electric capacity C6 is the voltage on the zero line N in three-phase alternating-current supply AC.
When Figure 19 a, Figure 20 a or the PFC rectifier shown in Figure 21 a are operated under battery mode, A phase PFC inductance, namely inductance L 2A is connected by the positive pole of K switch 3A and DC power supply DC, B phase PFC inductance, namely inductance L 2B is connected by the positive pole of K switch 3B and DC power supply DC, C phase PFC inductance, namely inductance L 2C is connected by the positive pole of K switch 3C and DC power supply DC, and K switch 4 closes.When the PFC rectifier shown in Figure 19 a, Figure 20 a or Figure 21 a is positive bus-bar electric capacity, namely during electric capacity C5 energy storage, Figure 19 a, Figure 20 a or the PFC rectifier shown in Figure 21 a have three kinds of working methods.
The first working method is: when PFC rectifier is positive bus-bar electric capacity by inductance L 2A, namely during electric capacity C5 energy storage, the first rectifying tube 181A high frequency chopping (switching tube Q6A high frequency chopping in Figure 20 a in Figure 19 a, K switch 5A high frequency chopping in Figure 21 a), switching tube Q4 turns off, switching tube Q5 conducting; When the first rectifying tube 181A conducting (switching tube Q6A conducting in Figure 20 a, K switch 5A in Figure 21 a closes) time, electric current is through positive pole, PFC inductance (i.e. inductance L 2A), the first rectifying tube 181A (switching tube Q6A in Figure 20 a of DC power supply DC, K switch 5A in Figure 21 a), arrive the negative pole of DC power supply DC, form tank circuit, inductance L 2A energy storage; When the first rectifying tube 181A turns off, (the switching tube Q6A in Figure 20 a turns off, K switch 5A in Figure 21 a disconnects) time, electric current is through positive pole, inductance L 2A, diode D5A, diode D7, electric capacity C5, the switching tube Q5 of DC power supply DC, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 2A releases energy, electric capacity C5 energy storage; That is, when PFC rectifier is electric capacity C5 energy storage by inductance L 2A, DC power supply DC, inductance L 2A, the first rectifying tube 181A (the switching tube Q6A in Figure 19 a, the K switch 5A in Figure 20 a), diode D5A, diode D7, electric capacity C5, switching tube Q5 form boost circuit.When PFC rectifier is positive bus-bar electric capacity by inductance L 2B, namely during electric capacity C5 energy storage, the first rectifying tube 181B high frequency chopping (the switching tube Q6B high frequency chopping in Figure 20 a, the K switch 5B high frequency chopping in Figure 21 a) in Figure 19 a, switching tube Q4 turns off, switching tube Q5 conducting; When the first rectifying tube 181B conducting (switching tube Q6B conducting in Figure 20 a, K switch 5B in Figure 21 a closes) time, electric current is through positive pole, PFC inductance (i.e. inductance L 2B), the first rectifying tube 181B (switching tube Q6B in Figure 20 a of DC power supply DC, K switch 5B in Figure 21 a), arrive the negative pole of DC power supply DC, form tank circuit, inductance L 2B energy storage; When the first rectifying tube 181B turns off, (the switching tube Q6B in Figure 20 a turns off, K switch 5B in Figure 21 a disconnects) time, electric current is through positive pole, inductance L 2B, diode D5B, diode D7, electric capacity C5, the switching tube Q5 of DC power supply DC, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 2B releases energy, electric capacity C5 energy storage; That is, when PFC rectifier is electric capacity C5 energy storage by inductance L 2B, DC power supply DC, inductance L 2B, the first rectifying tube 181B (the switching tube Q6B in Figure 20 a, the K switch 5B in Figure 21 a), diode D5B, diode D7, electric capacity C5, switching tube Q5 form boost circuit.When PFC rectifier is positive bus-bar electric capacity by inductance L 2C, namely during electric capacity C5 energy storage, the first rectifying tube 181C high frequency chopping (the switching tube Q6C high frequency chopping in Figure 20 a, the K switch 5C high frequency chopping in Figure 21 a) in Figure 19 a, switching tube Q4 turns off, switching tube Q5 conducting; When the first rectifying tube 181C conducting (switching tube Q6C conducting in Figure 20 a, K switch 5C in Figure 21 a closes) time, electric current is through positive pole, PFC inductance (i.e. inductance L 2C), the first rectifying tube 181C (switching tube Q6C in Figure 20 a of DC power supply DC, K switch 5C in Figure 21 a), arrive the negative pole of DC power supply DC, form tank circuit, inductance L 2C energy storage; When the first rectifying tube 181C turns off, (the switching tube Q6C in Figure 20 a turns off, K switch 5C in Figure 21 a disconnects) time, electric current is through positive pole, inductance L 2C, diode D5C, diode D7, electric capacity C5, the switching tube Q5 of DC power supply DC, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 2C releases energy, electric capacity C5 energy storage; That is, when PFC rectifier is electric capacity C5 energy storage by inductance L 2C, DC power supply DC, inductance L 2C, the first rectifying tube 181C (the switching tube Q6C in Figure 20 a, the K switch 5C in Figure 21 a), diode D5C, diode D7, electric capacity C5, switching tube Q5 form boost circuit.Due to switching tube Q5 conducting, therefore, the current potential of the negative pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
The second working method is: when PFC rectifier is positive bus-bar electric capacity by inductance L 2A, namely during electric capacity C5 energy storage, (the switching tube Q6A in Figure 20 a turns off the first rectifying tube 181A shutoff in Figure 19 a, K switch 5A in Figure 21 a disconnects), switching tube Q4 high frequency chopping, switching tube Q5 conducting; When switching tube Q4 conducting, electric current, through positive pole, inductance L 2A, diode D5A, switching tube Q4, the switching tube Q5 of DC power supply DC, arrives the negative pole of DC power supply DC, forms tank circuit, inductance L 2A energy storage; When switching tube Q4 turns off, electric current, through positive pole, inductance L 2A, diode D5A, diode D7, electric capacity C5, the switching tube Q5 of DC power supply DC, arrives the negative pole of DC power supply DC, and form continuous current circuit, inductance L 2A releases energy, electric capacity C5 energy storage; That is, when PFC rectifier is positive bus-bar electric capacity by inductance L 2A, namely during electric capacity C5 energy storage, DC power supply DC, inductance L 2A, diode D5A, switching tube Q4, diode D7, electric capacity C5, switching tube Q5 form boost circuit.When PFC rectifier is positive bus-bar electric capacity by inductance L 2B, namely during electric capacity C5 energy storage, DC power supply DC, inductance L 2B, diode D5B, switching tube Q4, diode D7, electric capacity C5, switching tube Q5 form boost circuit.When PFC rectifier is positive bus-bar electric capacity by inductance L 2C, namely during electric capacity C5 energy storage, DC power supply DC, inductance L 2C, diode D5C, switching tube Q4, diode D7, electric capacity C5, switching tube Q5 form boost circuit.Due to switching tube Q5 conducting, therefore, the current potential of the negative pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
The third working method is: when PFC rectifier is positive bus-bar electric capacity by inductance L 2A, namely during electric capacity C5 energy storage, the first rectifying tube 181A high frequency chopping (switching tube Q6A high frequency chopping in Figure 20 a in Figure 19 a, K switch 5A high frequency chopping in Figure 21 a), switching tube Q4 high frequency chopping, switching tube Q5 conducting, and the first rectifying tube 181A (the switching tube Q6A high frequency chopping in Figure 20 a, the K switch 5A high frequency chopping in Figure 21 a) and switching tube Q4 alternating chopper; When PFC rectifier is electric capacity C5 energy storage, DC power supply DC, inductance L 2A, the first rectifying tube 181A (the switching tube Q6A in Figure 20 a, the K switch 5A in Figure 21 a), diode D5A, diode D7, electric capacity C5, switching tube Q5 form a boost circuit; DC power supply DC, inductance L 2A, diode D5A, switching tube Q4, diode D7, electric capacity C5, switching tube Q5 form the 2nd boost circuit.When PFC rectifier is positive bus-bar electric capacity by inductance L 2B, namely during electric capacity C5 energy storage, the first rectifying tube 181B high frequency chopping (switching tube Q6B high frequency chopping in Figure 20 a in Figure 19 a, K switch 5B high frequency chopping in Figure 21 a), switching tube Q4 high frequency chopping, switching tube Q5 conducting, and the first rectifying tube 181B (the switching tube Q6B in Figure 20 a, the K switch 5B in Figure 21 a) and switching tube Q4 alternating chopper; When PFC rectifier is electric capacity C5 energy storage, DC power supply DC, inductance L 2B, the first rectifying tube 181B (switching tube Q6B in Figure 20 a, K switch 5B in Figure 21 a), diode D5B, diode D7, electric capacity C5, switching tube Q5 form the 3rd boost circuit, DC power supply DC, inductance L 2B, diode D5B, switching tube Q4, diode D7, electric capacity C5, switching tube Q5 form the 4th boost circuit.When PFC rectifier is positive bus-bar electric capacity by inductance L 2C, namely during electric capacity C5 energy storage, the first rectifying tube 181C high frequency chopping (switching tube Q6C high frequency chopping in Figure 20 a in Figure 19 a, K switch 5C high frequency chopping in Figure 21 a), switching tube Q4 high frequency chopping, switching tube Q5 conducting, and the first rectifying tube 181C (the switching tube Q6B in Figure 20 a, the K switch 5C in Figure 21 a) and switching tube Q4 alternating chopper; When PFC rectifier is electric capacity C5 energy storage, DC power supply DC, inductance L 2C, the first rectifying tube 181C (switching tube Q6C in Figure 20 a, K switch 5C in Figure 21 a), diode D5C, diode D7, electric capacity C5, switching tube Q5 form the 5th boost circuit, DC power supply DC, inductance L 2C, diode D5C, switching tube Q4, diode D7, electric capacity C5, switching tube Q5 form the 6th boost circuit.And due to switching tube Q5 conducting, therefore, the current potential of the negative pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
Similarly, the ripple of the electric current on PFC inductance is identical, when Figure 19 a, Figure 20 a or the PFC rectifier shown in Figure 21 a adopt the third mode of operation, the first mode of operation and this PFC rectifier is adopted to adopt the second mode of operation compared to this PFC rectifier, reduce switching frequency, thus reduce switching loss.
And, because the PFC rectifier shown in Figure 19 a, Figure 20 a or Figure 21 a adopts tank circuit during the first working method to be less than tank circuit when this PFC rectifier adopts the second working method, and loop is less, conduction loss is also less, the efficiency of PFC rectifier is also higher, therefore, the first working method is adopted can to improve the efficiency of PFC rectifier.
It is negative busbar electric capacity that the PFC rectifier shown as Figure 19 a, Figure 20 a or Figure 21 a to be operated under battery mode by inductance L 2A, namely during electric capacity C6 energy storage, the first rectifying tube 181A high frequency chopping (the switching tube Q6A high frequency chopping in the PFC rectifier shown in Figure 20 a, the K switch 5A high frequency chopping in Figure 21 a) in PFC rectifier shown in Figure 19 a, switching tube Q4 conducting, switching tube Q5 turns off; When the first rectifying tube 181A conducting (the switching tube Q6A conducting in Figure 20 a, the K switch 5A in Figure 21 a close) in Figure 19 a, electric current is through positive pole, PFC inductance (i.e. inductance L 2A), the first rectifying tube 181A (the K switch 5A in switching tube Q6A, Figure 21 a in Figure 20 a) of DC power supply DC, arrive the negative pole of DC power supply DC, form tank circuit, inductance L 2A energy storage; Now, the voltage of DC power supply DC negative pole is the voltage of voltage after diode D5A and the first continued flow tube 182 dividing potential drop of negative busbar output BUS-, and this voltage is less than the voltage of negative busbar output BUS-.When the first rectifying tube 181A in Figure 19 a turns off (the switching tube Q6A shutoff in Figure 20 a, the K switch 5A in Figure 21 a disconnect), electric current is through the positive pole of DC power supply DC, inductance L 2A, diode D5A, switching tube Q4, electric capacity C6, the first continued flow tube 182, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 2A releases energy, electric capacity C6 energy storage; Now, due to the first continued flow tube 182 conducting, therefore, the current potential of the positive pole of DC power supply DC is the current potential of negative busbar output BUS-by clamp; That is, when PFC rectifier is electric capacity C6 energy storage by inductance L 2A, the first rectifying tube 181A (the K switch 5A in switching tube Q6A, Figure 21 a in Figure 20 a) in DC power supply DC, inductance L 2A, Figure 19 a, diode D5A, switching tube Q4, electric capacity C6, the first continued flow tube 182 form boost circuit.It is negative busbar electric capacity that the PFC rectifier shown as Figure 19 a, Figure 20 a or Figure 21 a to be operated under battery mode by inductance L 2B, namely, during electric capacity C6 energy storage, the first rectifying tube 181B (the K switch 5B in switching tube Q6B, Figure 21 a in Figure 20 a) in DC power supply DC, inductance L 2B, Figure 19 a, diode D5B, switching tube Q4, electric capacity C6, the first continued flow tube 182 form boost circuit; And in this boost circuit, in the process of inductance L 2B energy storage, the voltage of DC power supply DC negative pole is the voltage of voltage after diode D5B and the first continued flow tube 182 dividing potential drop of negative busbar output BUS-, and this voltage is less than the voltage of negative busbar output BUS-; In this boost circuit, in the process that inductance L 2B releases energy, due to the first continued flow tube 182 conducting, therefore, the current potential of the negative pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.It is negative busbar electric capacity that the PFC rectifier shown as Figure 19 a, Figure 20 a or Figure 21 a to be operated under battery mode by inductance L 2C, namely, during electric capacity C6 energy storage, the first rectifying tube 181C (the K switch 5C in switching tube Q6C, Figure 21 a in Figure 20 a) in DC power supply DC, inductance L 2C, Figure 19 a, diode D5C, switching tube Q4, electric capacity C6, the first continued flow tube 182 form boost circuit; And in this boost circuit, in the process of inductance L 2C energy storage, the voltage of DC power supply DC negative pole is the voltage of voltage after diode D5C and the first continued flow tube 182 dividing potential drop of negative busbar output BUS-, and this voltage is less than the voltage of negative busbar output BUS-; In this boost circuit, in the process that inductance L 2C releases energy, due to the first continued flow tube 182 conducting, therefore, the current potential of the negative pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.Therefore, under PFC rectifier shown in Figure 19 a, Figure 20 a and Figure 21 a is operated in battery mode, be the first bus capacitor, namely negative busbar capacitance energy storage time, the amplitude of the saltus step of (i.e. the negative pole of the DC power supply) current potential of the electrode be connected with the first rectifying tube in DC power supply, be less than under PFC rectification circuit of the prior art is operated in battery mode, during for negative busbar capacitance energy storage, the amplitude of the saltus step of the current potential of the negative pole of DC power supply.
When Figure 19 a, Figure 20 a or the PFC rectifier shown in Figure 21 a are operated under utility mode, inductance L 2A is connected with the live wire L_A of the A phase of AC power AC by K switch 3A, inductance L 2B is connected with the live wire L_B of the B phase of AC power AC by K switch 3B, inductance L 2C is connected with the live wire L_C of the C phase of AC power AC by K switch 3C, and K switch 4 disconnects.Be positive bus-bar electric capacity under the PFC rectifier shown in Figure 19 a, Figure 20 a or Figure 21 a is operated in utility mode, namely during electric capacity C5 energy storage, Figure 19 a, Figure 20 a or the PFC rectifier shown in Figure 21 a have three kinds of working methods.
In the first working method, the first rectifying tube 181A in Figure 19 a, the first rectifying tube 181B and the first rectifying tube 181C all disconnect (the switching tube Q6A in Figure 20 a, switching tube Q6B and switching tube Q6C all turn off, and the K switch 5A in Figure 21 a, K switch 5B and K switch 5C all disconnect), switching tube Q4 high frequency chopping; Therefore, at the positive half period of the alternating voltage that the A phase of AC power AC exports, AC power AC, inductance L 2A, diode D5A, switching tube Q4, diode D7, electric capacity C5 form boost circuit; At the positive half period of the alternating voltage that the B phase of AC power AC exports, AC power AC, inductance L 2B, diode D5B, switching tube Q4, diode D7, electric capacity C5 form boost circuit; At the positive half period of the alternating voltage that the C phase of AC power AC exports, AC power AC, inductance L 2C, diode D5C, switching tube Q4, diode D7, electric capacity C5 form boost circuit.
In the second working method, the first rectifying tube 181A in Figure 19 a, the first rectifying tube 181B and the equal high frequency chopping of the first rectifying tube 181C (the equal high frequency chopping of K switch 5A, K switch 5B and K switch 5C in the switching tube Q6A in Figure 20 a, switching tube Q6B and the equal high frequency chopping of switching tube Q6C, Figure 21 a), switching tube Q4 turn off; Therefore, at the positive half period of the alternating voltage that the A phase of AC power AC exports, the first rectifying tube 181A (the K switch 5A in switching tube Q6A, Figure 21 a in Figure 20 a) in AC power AC, inductance L 2A, Figure 19 a, the antiparallel body diode of switching tube Q5, diode D5A, diode D7, electric capacity C5 form boost circuit; At the positive half period of the alternating voltage that the B phase of AC power AC exports, the first rectifying tube 181B (the K switch 5B in switching tube Q6B, Figure 21 a in Figure 20 a) in AC power AC, inductance L 2B, Figure 19 a, the antiparallel body diode of switching tube Q5, diode D5B, diode D7, electric capacity C5 form boost circuit; At the positive half period of the alternating voltage that the C phase of AC power AC exports, the first rectifying tube 181C (the K switch 5C in switching tube Q6C, Figure 21 a in Figure 20 a) in AC power AC, inductance L 2C, Figure 19 a, the antiparallel body diode of switching tube Q5, diode D5C, diode D7, electric capacity C5 form boost circuit.
In the third working method, the first rectifying tube 181A in Figure 19 a, first rectifying tube 181B and the equal high frequency chopping of the first rectifying tube 181C (the switching tube Q6A in Figure 20 a, switching tube Q6B and the equal high frequency chopping of switching tube Q6C, K switch 5A in Figure 21 a, the equal high frequency chopping of K switch 5B and K switch 5C), switching tube Q4 high frequency chopping, and the first rectifying tube 181A in Figure 19 a, first rectifying tube 181B and the first rectifying tube 181C (switching tube Q6A in Figure 20 a, switching tube Q6B and switching tube Q6C, K switch 5A in Figure 21 a, K switch 5B and K switch 5C) all with switching tube Q4 alternating chopper, therefore, at the positive half period of the alternating voltage that the A phase of AC power AC exports, the first rectifying tube 181A (the K switch 5A in switching tube Q6A, Figure 21 a in Figure 20 a) in AC power AC, inductance L 2A, Figure 19 a, the antiparallel body diode of switching tube Q5, diode D5A, diode D7, electric capacity C5 form a boost circuit, AC power AC, inductance L 2A, diode D5A, switching tube Q4, diode D7, electric capacity C5 form another boost circuit.At the positive half period of the alternating voltage that the B phase of AC power AC exports, the first rectifying tube 181B (the K switch 5B in switching tube Q6B, Figure 21 a in Figure 20 a) in AC power AC, inductance L 2B, Figure 19 a, the antiparallel body diode of switching tube Q5, diode D5B, diode D7, electric capacity C5 form a boost circuit; AC power AC, inductance L 2B, diode D5B, switching tube Q4, diode D7, electric capacity C5 form another boost circuit.At the positive half period of the alternating voltage that the C phase of AC power AC exports, the first rectifying tube 181C (the K switch 5C in switching tube Q6C, Figure 21 a in Figure 20 a) in AC power AC, inductance L 2C, Figure 19 a, the antiparallel body diode of switching tube Q5, diode D5C, diode D7, electric capacity C5 form a boost circuit; AC power AC, inductance L 2C, diode D5C, switching tube Q4, diode D7, electric capacity C5 form another boost circuit.
The PFC rectifier provided when the embodiment of the present invention is operated in the positive half period of the alternating voltage that AC power AC exports, at PFC inductance, namely when the ripple on inductance L 2A, inductance L 2B, inductance L 2C is identical, switch when adopting the third working method in PFC rectifier or the switching frequency of switching tube minimum, therefore, when adopting the third working method, the switching loss of PFC rectifier is minimum.
Be negative busbar electric capacity under the PFC rectifier shown in Figure 19 a is operated in utility mode, i.e. electric capacity C6 energy storage, namely at the negative half-cycle of alternating voltage that AC power AC exports, the first rectifying tube 181A in Figure 19 a, the first rectifying tube 181B and the equal conducting of the first rectifying tube 181C, switching tube Q5 high frequency chopping; Therefore, at the negative half-cycle of the alternating voltage that the A phase of AC power AC exports, AC power AC, switching tube Q5, electric capacity C6, the first continued flow tube 182, first rectifying tube 181A, inductance L 2A form boost circuit; At the negative half-cycle of the alternating voltage that the B phase of AC power AC exports, the first rectifying tube 181B, inductance L 2B in AC power AC, switching tube Q5, electric capacity C6, the first continued flow tube 182, Figure 18 form boost circuit; At the negative half-cycle of the alternating voltage that the C phase of AC power AC exports, the first rectifying tube 181C, inductance L 2C in AC power AC, switching tube Q5, electric capacity C6, the first continued flow tube 182, Figure 18 form boost circuit.
PFC rectifier shown in Figure 20 a is negative busbar electric capacity under being operated in utility mode, i.e. electric capacity C6 energy storage, namely when the negative half-cycle of the alternating voltage that AC power AC exports, the working method of this PFC rectifier is identical with the working method of the PFC rectifier shown in Figure 19 a, its difference is only: the first rectifying tube 181A conducting in Figure 19 a refers to that switching tube Q6A conducting in Figure 20 a or switching tube Q6A turn off, when switching tube Q6A conducting in Figure 20 a, switching tube Q6A and antiparallel body diode thereof are equivalent to the first rectifying tube 181A in Figure 19 a; When the switching tube Q6A in Figure 20 a turns off, the antiparallel body diode of switching tube Q6A is equivalent to the first rectifying tube 181A in Figure 19 a; The first rectifying tube 181B conducting in Figure 19 a refers to that switching tube Q6B conducting in Figure 20 a or switching tube Q6B turn off, and when switching tube Q6B conducting in Figure 20 a, switching tube Q6B and antiparallel body diode thereof are equivalent to the first rectifying tube 181B in Figure 19 a; When the switching tube Q6B in Figure 20 a turns off, the antiparallel body diode of switching tube Q6B is equivalent to the first rectifying tube 181B in Figure 19 a; The first rectifying tube 181C conducting in Figure 19 a refers to that switching tube Q6C conducting in Figure 20 a or switching tube Q6C turn off, and when switching tube Q6C conducting in Figure 20 a, switching tube Q6C and antiparallel body diode thereof are equivalent to the first rectifying tube 181C in Figure 19 a; When the switching tube Q6C in Figure 20 a turns off, the antiparallel body diode of switching tube Q6C is equivalent to the first rectifying tube 181C in Figure 19 a.
PFC rectifier shown in Figure 21 a is negative busbar electric capacity under being operated in utility mode, i.e. electric capacity C6 energy storage, namely when the negative half-cycle of the alternating voltage that AC power AC exports, the working method of this PFC rectifier is identical with the working method of the PFC rectifier shown in Figure 19 a, its difference is only: the first rectifying tube 181A conducting in Figure 19 a refers to that the K switch 5A in Figure 21 a closes or K switch 5A disconnects, when the K switch 5A in Figure 21 a closes, the parallel-connection structure of K switch 5A and diode D6A is equivalent to the first rectifying tube 181A in Figure 19 a; When the K switch 5A in Figure 21 a disconnects, the diode D6A in parallel with K switch 5A is equivalent to the first rectifying tube 181A in Figure 19 a; The first rectifying tube 181B conducting in Figure 19 a refers to that the K switch 5B in Figure 21 a closes or K switch 5B disconnects, and when the K switch 5B in Figure 21 a closes, the parallel-connection structure of K switch 5B and diode D6B is equivalent to the first rectifying tube 181B in Figure 19 a; When the K switch 5B in Figure 21 a disconnects, the diode D6B in parallel with K switch 5B is equivalent to the first rectifying tube 181B in Figure 19 a; The first rectifying tube 181C conducting in Figure 19 a refers to that the K switch 5C in Figure 21 a closes or K switch 5C disconnects, and when the K switch 5C in Figure 21 a closes, the parallel-connection structure of K switch 5C and diode D6C is equivalent to the first rectifying tube 181C in Figure 19 a; When the K switch 5C in Figure 21 a disconnects, the diode D6C in parallel with K switch 5C is equivalent to the first rectifying tube 181C in Figure 19 a.
Preferably, diode D5A in PFC rectifier shown in Figure 19 a also can replace with the switching tube of inverse parallel body diode, or replace with the parallel-connection structure of switch and diode, diode D5B in PFC rectifier shown in Figure 19 a also can replace with the switching tube of inverse parallel body diode, or replace with the parallel-connection structure of switch and diode, diode D5C in PFC rectifier shown in Figure 19 a also can replace with the switching tube of inverse parallel body diode, or replace with the parallel-connection structure of switch and diode, after replacing, the structure of the PFC rectifier shown in Figure 19 a as shown in Figure 22 a, in Figure 22 a, second rectifying tube 183A, second rectifying tube 183B, second rectifying tube 183C all both can be the switching tube of inverse parallel body diode, also can be the parallel-connection structure of switch and diode.PFC rectifier shown in Figure 22 a is negative busbar electric capacity under being operated in utility mode, and namely during electric capacity C6 energy storage, PFC rectifier has three kinds of working methods.
In the first working method, at the negative half-cycle of the A cross streams voltage that AC power AC exports, the first rectifying tube 181A conducting in Figure 22 a, switching tube Q5 high frequency chopping, the second rectifying tube 183A turn off; AC power AC, switching tube Q5, electric capacity C6, the first continued flow tube 182, first rectifying tube 181A, inductance L 2A form boost circuit; At the negative half-cycle of the B cross streams voltage that AC power AC exports, the first rectifying tube 181B conducting in Figure 22 a, switching tube Q5 high frequency chopping, the second rectifying tube 183B turn off; AC power AC, switching tube Q5, electric capacity C6, the first continued flow tube 182, first rectifying tube 181B, inductance L 2B form boost circuit; At the negative half-cycle of the C cross streams voltage that AC power AC exports, the first rectifying tube 181C conducting in Figure 22 a, switching tube Q5 high frequency chopping, the second rectifying tube 183C turn off; AC power AC, switching tube Q5, electric capacity C6, the first continued flow tube 182, first rectifying tube 181C, inductance L 2C form boost circuit.
In the second working method, at the negative half-cycle of the A cross streams voltage that AC power AC exports, the first rectifying tube 181A conducting in Figure 22 a, switching tube Q5 shutoff, the second rectifying tube 183A high frequency chopping; The antiparallel body diode of AC power AC, switching tube Q4, the second rectifying tube 183A, inductance L 2A, electric capacity C6, the first continued flow tube 182, first rectifying tube 181A form boost circuit; At the negative half-cycle of the B cross streams voltage that AC power AC exports, the first rectifying tube 181B conducting in Figure 22 a, switching tube Q5 shutoff, the second rectifying tube 183B high frequency chopping; The antiparallel body diode of AC power AC, switching tube Q4, the second rectifying tube 183B, inductance L 2B, electric capacity C6, the first continued flow tube 182, first rectifying tube 181B form boost circuit; At the negative half-cycle of the C cross streams voltage that AC power AC exports, the first rectifying tube 181C conducting in Figure 22 a, switching tube Q5 shutoff, the second rectifying tube 183C high frequency chopping; The antiparallel body diode of AC power AC, switching tube Q4, the second rectifying tube 183C, inductance L 2C, electric capacity C6, the first continued flow tube 182, first rectifying tube 181C form boost circuit.
In the third working method, at the negative half-cycle of the A cross streams voltage that AC power AC exports, the first rectifying tube 181A conducting in Figure 22 a, switching tube Q5 high frequency chopping, the second rectifying tube 183A high frequency chopping, and switching tube Q5 and the second rectifying tube 183A alternating chopper; AC power AC, switching tube Q5, electric capacity C6, the first continued flow tube 182, first rectifying tube 181A, inductance L 2A form a boost circuit; The antiparallel body diode of AC power AC, switching tube Q4, the second rectifying tube 183A, inductance L 2A, electric capacity C6, the first continued flow tube 182, first rectifying tube 181A form another boost circuit; At the negative half-cycle of the B cross streams voltage that AC power AC exports, the first rectifying tube 181B conducting in Figure 22 a, switching tube Q5 high frequency chopping, the second rectifying tube 183B high frequency chopping, and switching tube Q5 and the second rectifying tube 183B alternating chopper; AC power AC, switching tube Q5, electric capacity C6, the first continued flow tube 182, first rectifying tube 181B, inductance L 2B form boost circuit; The antiparallel body diode of AC power AC, switching tube Q4, the second rectifying tube 183B, inductance L 2B, electric capacity C6, the first continued flow tube 182, first rectifying tube 181B form boost circuit; At the negative half-cycle of the C cross streams voltage that AC power AC exports, the first rectifying tube 181C conducting in Figure 22 a, switching tube Q5 high frequency chopping, the second rectifying tube 183C high frequency chopping, and switching tube Q5 and the second rectifying tube 183C alternating chopper; AC power AC, switching tube Q5, electric capacity C6, the first continued flow tube 182, first rectifying tube 181C, inductance L 2C form boost circuit; The antiparallel body diode of AC power AC, switching tube Q4, the second rectifying tube 183C, inductance L 2C, electric capacity C6, the first continued flow tube 182, first rectifying tube 181C form boost circuit.
Under the PFC rectifier shown in Figure 22 a is operated in utility mode, for negative busbar electric capacity, during i.e. electric capacity C6 energy storage (namely at the negative half-cycle of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Figure 22 a, when the first rectifying tube 181A in Figure 22 a is the switching tube of inverse parallel body diode, the first rectifying tube 181A conducting in Figure 22 a refers to that switching tube conducting or switching tube turn off, when switching tube conducting, switching tube and antiparallel body diode thereof are equivalent to the first rectifying tube 181A in Figure 22 a; When switching tube turns off, the antiparallel body diode of switching tube is equivalent to the first rectifying tube 181A in Figure 22 a.When the first rectifying tube 181A in Figure 22 a is the parallel-connection structure of switch and diode, the first rectifying tube 181A conducting in Figure 22 a refers to that switch closes or switch disconnects, when the switch is closed, the parallel-connection structure of switch and diode is equivalent to the first rectifying tube 181A in Figure 22 a; When the switch in Figure 22 a disconnects, with the first rectifying tube 181A of diode equivalent in Figure 22 a of switch in parallel.Situation when situation during the first rectifying tube 181B conducting in Figure 22 a and the first rectifying tube 181B conducting in Figure 22 a is identical, does not repeat them here.Situation when situation during the first rectifying tube 181C conducting in Figure 22 a and the first rectifying tube 181C conducting in Figure 22 a is identical, does not repeat them here.
Under the PFC rectifier shown in Figure 22 a is operated in utility mode, for negative busbar electric capacity, during i.e. electric capacity C6 energy storage (namely at the negative half-cycle of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Figure 22 a, when the second rectifying tube 183A in Figure 22 a is the switching tube of inverse parallel body diode, second rectifying tube 183A turns off and refers to that switching tube turns off, when the second rectifying tube 183A in Figure 22 a is the parallel-connection structure of switch and diode, the second rectifying tube 183A turns off and refers to that switch disconnects.Situation when situation when the second rectifying tube 183B in Figure 22 a turns off turns off with the second rectifying tube 183B in Figure 22 a is identical, does not repeat them here.Situation when situation when the second rectifying tube 183C in Figure 22 a turns off turns off with the second rectifying tube 183C in Figure 22 a is identical, does not repeat them here.
Under the PFC rectifier shown in Figure 22 a is operated in utility mode, for negative busbar electric capacity, during i.e. electric capacity C6 energy storage (namely at the negative half-cycle of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Figure 22 a, when the second rectifying tube 183A in Figure 22 a is the switching tube of inverse parallel body diode, second rectifying tube 183A high frequency chopping refers to switching tube high frequency chopping, when the second rectifying tube 183A in Figure 22 a is the parallel-connection structure of switch and diode, the second rectifying tube 183A high frequency chopping refers to switch high-frequency copped wave.Situation when situation during the second rectifying tube 183B high frequency chopping in Figure 22 a and the second rectifying tube 183B high frequency chopping in Figure 22 a is identical, does not repeat them here.Situation when situation during the second rectifying tube 183C high frequency chopping in Figure 22 a and the second rectifying tube 183C high frequency chopping in Figure 22 a is identical, does not repeat them here.
Further, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides is as shown in Figure 23 a, Figure 24 a, Figure 25 a; Wherein, the operation principle of the PFC rectifier shown in Figure 23 a is identical with the operation principle of the PFC rectifier shown in Figure 19 a, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 24 a is identical with the operation principle of the PFC rectifier shown in Figure 20 a, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 25 a is identical with the operation principle of the PFC rectifier shown in Figure 21 a, does not repeat them here.
When Figure 23 a, Figure 24 a or the PFC rectifier shown in Figure 25 a are negative busbar capacitance energy storage under being operated in battery mode, in the process of PFC inductance (inductance L 2A, inductance L 2B or inductance L 2C) energy storage, due to switching tube Q5 conducting, the voltage of the negative pole of DC power supply DC is the voltage of voltage after the junction capacitance of diode D5A (diode D5B or diode D5C) and the junction capacitance dividing potential drop of diode D8 of negative busbar output BUS-, and, the junction capacitance of diode D8 is larger, and the voltage of the negative pole of DC power supply DC is more close to the voltage of negative busbar output BUS-.
Therefore, preferably, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides also comprises the first electric capacity, i.e. electric capacity C9, first electric capacity is in parallel with the first continued flow tube, and now, the PFC rectifier that the embodiment of the present invention provides is as shown in Figure 26 a, Figure 27 a, Figure 28 a; Wherein, the operation principle of the PFC rectifier shown in Figure 26 a is identical with the operation principle of the PFC rectifier shown in Figure 19 a, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 27 a is identical with the operation principle of the PFC rectifier shown in Figure 20 a, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 28 a is identical with the operation principle of the PFC rectifier shown in Figure 21 a, does not repeat them here.
In Figure 26 a, Figure 27 a and Figure 28 a, two ends due to diode D8 are in parallel electric capacity C9, this is equivalent to the junction capacitance increasing diode D8, therefore, when Figure 26 a, Figure 27 a or the PFC rectifier shown in Figure 28 a are negative busbar capacitance energy storage under being operated in battery mode, in the process of PFC inductive energy storage, the voltage of the negative pole of DC power supply DC is more close to the voltage of negative busbar output BUS-.
Alternatively, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides also comprises the first switch, i.e. K switch 6, now, the PFC rectifier that provides of the embodiment of the present invention is as shown in Figure 29 a, Figure 30 a, Figure 31 a.The first switch in Figure 29 a, Figure 30 a or Figure 31 a, namely K switch 6 disconnects when PFC rectifier is operated in utility mode, and now, the first continued flow tube is equivalent to a diode; The first switch in Figure 29 a, Figure 30 a or Figure 31 a, namely K switch 6 is the positive bus-bar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, and namely disconnect during electric capacity C5 energy storage, now, the first continued flow tube is equivalent to a diode; The first switch in Figure 29 a, Figure 30 a or Figure 31 a, namely K switch 6 is the negative busbar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, in the process of i.e. electric capacity C6 energy storage, can disconnect when PFC inductance (inductance L 2A, inductance L 2B or inductance L 2C) releases energy and also can close, now, when K switch 6 disconnects, the first continued flow tube is equivalent to a diode, when K switch 6 closes, the first continued flow tube is equivalent to a section lead.The first switch in Figure 29 a, Figure 30 a or Figure 31 a, namely K switch 6 is the negative busbar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, closed during PFC inductance (inductance L 2A, inductance L 2B or inductance L 2C) stored energy in the process of i.e. electric capacity C6 energy storage, now, the current potential of the negative pole of DC power supply DC equals the voltage of negative busbar output BUS-; And Figure 29 a, Figure 30 a or the PFC rectifier shown in Figure 31 a are the negative busbar electric capacity in PFC rectifier under being operated in battery mode, in the process of i.e. electric capacity C6 energy storage, when PFC inductance (inductance L 2A, inductance L 2B or inductance L 2C) releases energy, the current potential of the negative pole of DC power supply DC equals the voltage of negative busbar output BUS-.
Therefore, under the PFC rectifier shown in Figure 29 a, Figure 30 a and Figure 31 a is operated in battery mode, during for negative busbar capacitance energy storage, the current potential of the negative pole of DC power supply DC can not saltus step.
The operation principle of the circuit in the PFC rectifier shown in Figure 29 a except switch K6 is identical with the operation principle of the PFC rectifier shown in Figure 23 a, does not repeat them here; The operation principle of the circuit in the PFC rectifier shown in Figure 30 a except switch K6 is identical with the operation principle of the PFC rectifier shown in Figure 24 a, does not repeat them here; The operation principle of the circuit in the PFC rectifier shown in Figure 31 a except switch K6 is identical with the operation principle of the PFC rectifier shown in Figure 25 a, does not repeat them here.
When the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is the switching tube of inverse parallel body diode, the PFC rectifier that the embodiment of the present invention provides is as shown in Figure 32 a, Figure 33 a, Figure 34 a.Switching tube Q8 in Figure 32 a, Figure 33 a, the PFC rectifier shown in Figure 34 a and antiparallel body diode thereof are equivalent to diode D8 in Figure 29 a, Figure 30 a and Figure 31 a structure in parallel with K switch 6; Wherein, the antiparallel body diode of switching tube Q8 is equivalent to diode D8, and switching tube Q8 is equivalent to K switch 6.The operation principle of the PFC rectifier shown in Figure 32 a is identical with the operation principle of the PFC rectifier shown in Figure 29 a, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 33 a is identical with the operation principle of the PFC rectifier shown in Figure 30 a, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 34 a is identical with the operation principle of the PFC rectifier shown in Figure 31 a, does not repeat them here.
When when the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is three-phase PFC rectification circuit and this PFC rectifier is operated under battery mode, the negative pole of DC power supply is connected with PFC inductance, the PFC rectifier that the embodiment of the present invention provides as shown in fig. 19b, comprises PFC rectification circuit, each first rectifying tube in this PFC rectification circuit is the switching tube of inverse parallel body diode, namely the first rectifying tube 181A is the switching tube Q6A of inverse parallel body diode, the switching tube Q6C (shown in Figure 20 b) of the first rectifying tube 181B to be the switching tube Q6B of inverse parallel body diode and the first rectifying tube 181C be inverse parallel body diode, or each first rectifying tube in this PFC rectification circuit is parallel-connection structure (in Figure 21 b parallel-connection structure of the first rectifying tube 181A to be K switch 5A be diode D5A of switch and diode, the parallel-connection structure of the first rectifying tube 181B to be K switch 5B be diode D5B, the parallel-connection structure of the first rectifying tube 181C to be K switch 5C be diode D5C), wherein, each first rectifying tube is the rectifying tube be connected with DC power supply DC in two rectifying tubes of PFC rectification circuit when being operated under battery mode in PFC rectification circuit, wherein, time under battery mode, DC power supply DC is PFC rectifier power supply.
When PFC rectifier is operated under battery mode, in Figure 19 b, Figure 20 b or Figure 21 b, the negative pole of DC power supply DC connects the PFC inductance in PFC rectifier, i.e. inductance L 2A, inductance L 2B, inductance L 2C.
At Figure 19 b, in Figure 20 b or Figure 21 b, the PFC rectifier that the embodiment of the present invention provides comprises: the first rectifying tube 181A (the switching tube Q6A in Figure 20 b in diode D6A and Figure 19 b, the parallel-connection structure of the K switch 5A in Figure 21 b and diode D5A) formation the 3rd branch road of connecting, the first rectifying tube 181B (switching tube Q6B in Figure 20 b in diode D6B and Figure 19 b, the parallel-connection structure of the K switch 5B in Figure 21 b and diode D5B) formation the 4th branch road of connecting, the first rectifying tube 181C (switching tube Q6C in Figure 20 b in diode D6C and Figure 19 b, the parallel-connection structure of the K switch 5C in Figure 21 b and diode D5C) formation the 5th branch road of connecting, switching tube Q4 and switching tube Q5 series connection formation the 6th branch road, A phase PFC inductance, namely one end of inductance L 2A connects the first rectifying tube 181A (the switching tube Q6A in Figure 20 b in diode D6A and Figure 19 b, the parallel-connection structure of the K switch 5A in Figure 21 b and diode D5A) tie point that is connected, B phase PFC inductance, namely one end of inductance L 2B connects the first rectifying tube 181B (the switching tube Q6B in Figure 20 b in diode D6B and Figure 19 b, the parallel-connection structure of the K switch 5B in Figure 21 b and diode D5B) tie point that is connected, C phase PFC inductance, namely one end of inductance L 2C connects the first rectifying tube 181C (the switching tube Q6C in Figure 20 b in diode D6C and Figure 19 b, the parallel-connection structure of the K switch 5C in Figure 21 b and diode D5C) tie point that is connected, 3rd branch road, the 4th branch road, the 5th branch road are connected positive bus-bar electric capacity with the one end after the 6th branch circuit parallel connection by the first continued flow tube 182, i.e. one end of electric capacity C5, one end that the first continued flow tube 182 is connected with electric capacity C5 is the positive bus-bar output BUS+ of three-phase PFC rectification circuit, 3rd branch road, the 4th branch road, the 5th branch road are connected negative busbar electric capacity with the other end after the 6th branch circuit parallel connection by diode D8, i.e. one end of electric capacity C6, the other end of electric capacity C6 connects the other end of electric capacity C5, and one end that diode D8 is connected with electric capacity C6 is the negative busbar output BUS-of three-phase PFC rectification circuit, the voltage of the tie point that electric capacity C5 is connected with electric capacity C6 is the voltage on the zero line N in three-phase alternating-current supply AC.
When Figure 19 b, Figure 20 b or the PFC rectifier shown in Figure 21 b are operated under battery mode, A phase PFC inductance, namely inductance L 2A is connected by the negative pole of K switch 3A and DC power supply DC, B phase PFC inductance, namely inductance L 2B is connected by the negative pole of K switch 3B and DC power supply DC, C phase PFC inductance, namely inductance L 2C is connected by the negative pole of K switch 3C and DC power supply DC, and K switch 4 closes.When the PFC rectifier shown in Figure 19 b, Figure 20 b or Figure 21 b is negative busbar electric capacity, namely during electric capacity C6 energy storage, Figure 19 b, Figure 20 b or the PFC rectifier shown in Figure 21 b have three kinds of working methods.
The first working method is: when PFC rectifier is negative busbar electric capacity by inductance L 2A, namely during electric capacity C6 energy storage, the first rectifying tube 181A high frequency chopping (switching tube Q6A high frequency chopping in Figure 20 b in Figure 19 b, K switch 5A high frequency chopping in Figure 21 b), switching tube Q5 turns off, switching tube Q4 conducting; When the first rectifying tube 181A conducting (switching tube Q6A conducting in Figure 20 b, K switch 5A in Figure 21 b closes) time, electric current is through positive pole, the first rectifying tube 181A (switching tube Q6A in Figure 20 a of DC power supply DC, K switch 5A in Figure 21 a), PFC inductance (i.e. inductance L 2A), arrive the negative pole of DC power supply DC, form tank circuit, inductance L 2A energy storage; When the first rectifying tube 181A turns off, (the switching tube Q6A in Figure 20 b turns off, K switch 5A in Figure 21 b disconnects) time, electric current is through the positive pole of DC power supply DC, switching tube Q4, electric capacity C6, diode D8, diode D6A, inductance L 2A, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 2A releases energy, electric capacity C6 energy storage; That is, when PFC rectifier is electric capacity C6 energy storage by inductance L 2A, DC power supply DC, the first rectifying tube 181A (the switching tube Q6A in Figure 19 b, the K switch 5A in Figure 20 b), inductance L 2A, switching tube Q4, electric capacity C6, diode D8, diode D6A form boost circuit.When PFC rectifier is negative busbar electric capacity by inductance L 2B, namely during electric capacity C6 energy storage, the first rectifying tube 181B high frequency chopping (the switching tube Q6B high frequency chopping in Figure 20 b, the K switch 5B high frequency chopping in Figure 21 b) in Figure 19 b, switching tube Q5 turns off, switching tube Q4 conducting; When the first rectifying tube 181B conducting (switching tube Q6B conducting in Figure 20 b, K switch 5B in Figure 21 b closes) time, electric current is through positive pole, the first rectifying tube 181B (switching tube Q6B in Figure 20 b of DC power supply DC, K switch 5B in Figure 21 b), PFC inductance (i.e. inductance L 2B), arrive the negative pole of DC power supply DC, form tank circuit, inductance L 2B energy storage; When the first rectifying tube 181B turns off, (the switching tube Q6B in Figure 20 b turns off, K switch 5B in Figure 21 b disconnects) time, electric current is through the positive pole of DC power supply DC, switching tube Q4, electric capacity C6, diode D8, diode D6B, inductance L 2B, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 2B releases energy, electric capacity C6 energy storage; That is, when PFC rectifier is electric capacity C6 energy storage by inductance L 2B, DC power supply DC, the first rectifying tube 181B (the switching tube Q6B in Figure 20 b, the K switch 5B in Figure 21 b), inductance L 2B, switching tube Q4, electric capacity C6, diode D8, diode D6B form boost circuit.When PFC rectifier is negative busbar electric capacity by inductance L 2C, namely during electric capacity C6 energy storage, the first rectifying tube 181C high frequency chopping (the switching tube Q6C high frequency chopping in Figure 20 b, the K switch 5C high frequency chopping in Figure 21 b) in Figure 19 b, switching tube Q5 turns off, switching tube Q4 conducting; When the first rectifying tube 181C conducting (switching tube Q6C conducting in Figure 20 b, K switch 5C in Figure 21 b closes) time, electric current is through positive pole, the first rectifying tube 181C (switching tube Q6C in Figure 20 b of DC power supply DC, K switch 5C in Figure 21 b), PFC inductance (i.e. inductance L 2C), arrive the negative pole of DC power supply DC, form tank circuit, inductance L 2C energy storage; When the first rectifying tube 181C turns off, (the switching tube Q6C in Figure 20 b turns off, K switch 5C in Figure 21 b disconnects) time, electric current is through the positive pole of DC power supply DC, switching tube Q4, electric capacity C6, diode D8, diode D6C, inductance L 2C, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 2C releases energy, electric capacity C6 energy storage; That is, when PFC rectifier is electric capacity C6 energy storage by inductance L 2C, DC power supply DC, inductance L 2C, the first rectifying tube 181C (the switching tube Q6C in Figure 20 b, the K switch 5C in Figure 21 b), switching tube Q4, electric capacity C6, diode D8, diode D6C form boost circuit.Due to switching tube Q4 conducting, therefore, the current potential of the positive pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
The second working method is: when PFC rectifier is negative busbar electric capacity by inductance L 2A, namely during electric capacity C6 energy storage, (the switching tube Q6A in Figure 20 b turns off the first rectifying tube 181A shutoff in Figure 19 b, K switch 5A in Figure 21 b disconnects), switching tube Q5 high frequency chopping, switching tube Q4 conducting; When switching tube Q5 conducting, electric current, through the positive pole of DC power supply DC, switching tube Q4, switching tube Q5, diode D6A, inductance L 2A, arrives the negative pole of DC power supply DC, forms tank circuit, inductance L 2A energy storage; When switching tube Q5 turns off, electric current, through the positive pole of DC power supply DC, switching tube Q4, electric capacity C6, diode D8, diode D6A, inductance L 2A, arrives the negative pole of DC power supply DC, and form continuous current circuit, inductance L 2A releases energy, electric capacity C6 energy storage; That is, when PFC rectifier is negative busbar electric capacity by inductance L 2A, namely during electric capacity C6 energy storage, DC power supply DC, switching tube Q4, switching tube Q5, diode D6A, inductance L 2A, electric capacity C6, diode D8 form boost circuit.When PFC rectifier is negative busbar electric capacity by inductance L 2B, namely during electric capacity C6 energy storage, DC power supply DC, switching tube Q4, switching tube Q5, diode D6B, inductance L 2B, electric capacity C6, diode D8 form boost circuit.When PFC rectifier is negative busbar electric capacity by inductance L 2C, namely during electric capacity C6 energy storage, DC power supply DC, switching tube Q4, switching tube Q5, diode D6C, inductance L 2C, electric capacity C6, diode D8 form boost circuit.Due to switching tube Q4 conducting, therefore, the current potential of the positive pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
The third working method is: when PFC rectifier is negative busbar electric capacity by inductance L 2A, namely during electric capacity C6 energy storage, the first rectifying tube 181A high frequency chopping (switching tube Q6A high frequency chopping in Figure 20 b in Figure 19 b, K switch 5A high frequency chopping in Figure 21 b), switching tube Q5 high frequency chopping, switching tube Q4 conducting, and the first rectifying tube 181A (the switching tube Q6A high frequency chopping in Figure 20 b, the K switch 5A high frequency chopping in Figure 21 b) and switching tube Q4 alternating chopper; When PFC rectifier is electric capacity C6 energy storage, DC power supply DC, the first rectifying tube 181A (the switching tube Q6A in Figure 20 b, the K switch 5A in Figure 21 b), switching tube Q4, electric capacity C6, diode D8, diode D6A, inductance L 2A form a boost circuit; DC power supply DC, switching tube Q4, switching tube Q5, diode D6A, inductance L 2A, electric capacity C6, diode D8 form the 2nd boost circuit.When PFC rectifier is negative busbar electric capacity by inductance L 2B, namely during electric capacity C6 energy storage, the first rectifying tube 181B high frequency chopping (switching tube Q6B high frequency chopping in Figure 20 b in Figure 19 b, K switch 5B high frequency chopping in Figure 21 b), switching tube Q5 high frequency chopping, switching tube Q4 conducting, and the first rectifying tube 181B (the switching tube Q6B in Figure 20 b, the K switch 5B in Figure 21 b) and switching tube Q5 alternating chopper; When PFC rectifier is electric capacity C6 energy storage, DC power supply DC, the first rectifying tube 181B (switching tube Q6B in Figure 20 b, K switch 5B in Figure 21 b), inductance L 2B, switching tube Q4, electric capacity C6, diode D8, diode D6B form the 3rd boost circuit, DC power supply DC, switching tube Q4, switching tube Q5, diode D6B, inductance L 2B, electric capacity C6, diode D8 form the 4th boost circuit.When PFC rectifier is negative busbar electric capacity by inductance L 2C, namely during electric capacity C6 energy storage, the first rectifying tube 181C high frequency chopping (switching tube Q6C high frequency chopping in Figure 20 b in Figure 19 b, K switch 5C high frequency chopping in Figure 21 b), switching tube Q5 high frequency chopping, switching tube Q4 conducting, and the first rectifying tube 181C (the switching tube Q6B in Figure 20 b, the K switch 5C in Figure 21 b) and switching tube Q5 alternating chopper; When PFC rectifier is electric capacity C6 energy storage, DC power supply DC, the first rectifying tube 181C (switching tube Q6C in Figure 20 b, K switch 5C in Figure 21 b), inductance L 2C, switching tube Q4, electric capacity C6, diode D8, diode D6C form the 5th boost circuit, DC power supply DC, switching tube Q4, switching tube Q5, diode D6C, inductance L 2C, electric capacity C6, diode D8 form the 6th boost circuit.And due to switching tube Q4 conducting, therefore, the current potential of the positive pole of DC power supply DC is the current potential on the zero line of AC power AC by clamp.
Similarly, the ripple of the electric current on PFC inductance is identical, when Figure 19 b, Figure 20 b or the PFC rectifier shown in Figure 21 b adopt the third mode of operation, the first mode of operation and this PFC rectifier is adopted to adopt the second mode of operation compared to this PFC rectifier, reduce switching frequency, thus reduce switching loss.
And, because the PFC rectifier shown in Figure 19 b, Figure 20 b or Figure 21 b adopts tank circuit during the first working method to be less than tank circuit when this PFC rectifier adopts the second working method, and loop is less, conduction loss is also less, the efficiency of PFC rectifier is also higher, therefore, the first working method is adopted can to improve the efficiency of PFC rectifier.
It is positive bus-bar electric capacity that the PFC rectifier shown as Figure 19 b, Figure 20 b or Figure 21 b to be operated under battery mode by inductance L 2A, namely during electric capacity C5 energy storage, the first rectifying tube 181A high frequency chopping (the switching tube Q6A high frequency chopping in the PFC rectifier shown in Figure 20 b, the K switch 5A high frequency chopping in Figure 21 b) in PFC rectifier shown in Figure 19 b, switching tube Q5 conducting, switching tube Q4 turns off; When the first rectifying tube 181A conducting (the switching tube Q6A conducting in Figure 20 b, the K switch 5A in Figure 21 b close) in Figure 19 b, electric current is through positive pole, the first rectifying tube 181A (the K switch 5A in switching tube Q6A, Figure 21 b in Figure 20 b), the PFC inductance (i.e. inductance L 2A) of DC power supply DC, arrive the negative pole of DC power supply DC, form tank circuit, inductance L 2A energy storage; Now, the voltage of DC power supply DC negative pole is the voltage of voltage after diode D6A and the first continued flow tube 182 dividing potential drop of positive bus-bar output BUS+, and this voltage is less than the voltage of positive bus-bar output BUS+.When the first rectifying tube 181A in Figure 19 b turns off (the switching tube Q6A shutoff in Figure 20 b, the K switch 5A in Figure 21 b disconnect), electric current is through the positive pole of DC power supply DC, the first continued flow tube 182, electric capacity C5, switching tube Q5, diode D6A, inductance L 2A, arrive the negative pole of DC power supply DC, form continuous current circuit, inductance L 2A releases energy, electric capacity C5 energy storage; Now, due to the first continued flow tube 182 conducting, therefore, the current potential of the positive pole of DC power supply DC is the current potential of positive bus-bar output BUS+ by clamp; That is, when PFC rectifier is electric capacity C5 energy storage by inductance L 2A, the first rectifying tube 181A (the K switch 5A in switching tube Q6A, Figure 21 b in Figure 20 b) in DC power supply DC, Figure 19 b, inductance L 2A, the first continued flow tube 182, electric capacity C5, switching tube Q5, diode D6A form boost circuit.It is positive bus-bar electric capacity that the PFC rectifier shown as Figure 19 b, Figure 20 b or Figure 21 b to be operated under battery mode by inductance L 2B, namely, during electric capacity C5 energy storage, the first rectifying tube 181B (the K switch 5B in switching tube Q6B, Figure 21 b in Figure 20 b) in DC power supply DC, Figure 19 b, inductance L 2B, the first continued flow tube 182, electric capacity C5, switching tube Q5, diode D6B form boost circuit; And in this boost circuit, in the process of inductance L 2B energy storage, the voltage of DC power supply DC positive pole is the voltage of voltage after diode D6B and the first continued flow tube 182 dividing potential drop of positive bus-bar output BUS+, and this voltage is less than the voltage of positive bus-bar output BUS+; In this boost circuit, in the process that inductance L 2B releases energy, due to the first continued flow tube 182 conducting, therefore, the current potential of the positive pole of DC power supply DC is the current potential of positive bus-bar output BUS+ by clamp.It is positive bus-bar electric capacity that the PFC rectifier shown as Figure 19 b, Figure 20 b or Figure 21 b to be operated under battery mode by inductance L 2C, namely, during electric capacity C5 energy storage, the first rectifying tube 181C (the K switch 5C in switching tube Q6C, Figure 21 b in Figure 20 b) in DC power supply DC, Figure 19 b, inductance L 2C, the first continued flow tube 182, electric capacity C5, switching tube Q5, diode D6C form boost circuit; And in this boost circuit, in the process of inductance L 2C energy storage, the voltage of DC power supply DC positive pole is the voltage of voltage after diode D6C and the first continued flow tube 182 dividing potential drop of positive bus-bar output BUS+, and this voltage is less than the voltage of positive bus-bar output BUS+; In this boost circuit, in the process that inductance L 2C releases energy, due to the first continued flow tube 182 conducting, therefore, the current potential of the positive pole of DC power supply DC is the current potential of positive bus-bar output BUS+ by clamp.Therefore, under PFC rectifier shown in Figure 19 b, Figure 20 b and Figure 21 b is operated in battery mode, be the first bus capacitor, namely positive bus-bar capacitance energy storage time, the amplitude of the saltus step of (i.e. the positive pole of the DC power supply) current potential of the electrode be connected with the first rectifying tube in DC power supply, be less than under PFC rectification circuit of the prior art is operated in battery mode, during for positive bus-bar capacitance energy storage, the amplitude of the saltus step of the current potential of the positive pole of DC power supply.
When Figure 19 b, Figure 20 b or the PFC rectifier shown in Figure 21 b are operated under utility mode, inductance L 2A is connected with the live wire L_A of the A phase of AC power AC by K switch 3A, inductance L 2B is connected with the live wire L_B of the B phase of AC power AC by K switch 3B, inductance L 2C is connected with the live wire L_C of the C phase of AC power AC by K switch 3C, and K switch 4 disconnects.Be negative busbar electric capacity under the PFC rectifier shown in Figure 19 b, Figure 20 b or Figure 21 b is operated in utility mode, namely during electric capacity C6 energy storage, Figure 19 b, Figure 20 b or the PFC rectifier shown in Figure 21 b have three kinds of working methods.
In the first working method, the first rectifying tube 181A in Figure 19 b, the first rectifying tube 181B and the first rectifying tube 181C all disconnect (the switching tube Q6A in Figure 20 b, switching tube Q6B and switching tube Q6C all turn off, and the K switch 5A in Figure 21 b, K switch 5B and K switch 5C all disconnect), switching tube Q5 high frequency chopping; Therefore, at the negative half-cycle of the alternating voltage that the A phase of AC power AC exports, AC power AC, switching tube Q5, diode D6A, inductance L 2A, electric capacity C6, diode D8 form boost circuit; At the negative half-cycle of the alternating voltage that the B phase of AC power AC exports, AC power AC, switching tube Q5, diode D6B, inductance L 2B, electric capacity C6, diode D8 form boost circuit; At the negative half-cycle of the alternating voltage that the C phase of AC power AC exports, AC power AC, switching tube Q5, diode D6C, inductance L 2C, electric capacity C6, diode D8 form boost circuit.
In the second working method, the first rectifying tube 181A in Figure 19 b, the first rectifying tube 181B and the equal high frequency chopping of the first rectifying tube 181C (the equal high frequency chopping of K switch 5A, K switch 5B and K switch 5C in the switching tube Q6A in Figure 20 b, switching tube Q6B and the equal high frequency chopping of switching tube Q6C, Figure 21 b), switching tube Q5 turn off; Therefore, at the negative half-cycle of the alternating voltage that the A phase of AC power AC exports, the first rectifying tube 181A (the K switch 5A in switching tube Q6A, Figure 21 b in Figure 20 b) in the antiparallel body diode of AC power AC, switching tube Q4, Figure 19 b, inductance L 2A, electric capacity C6, diode D8, diode D6A form boost circuit; At the negative half-cycle of the alternating voltage that the B phase of AC power AC exports, the first rectifying tube 181B (the K switch 5B in switching tube Q6B, Figure 21 b in Figure 20 b) in the antiparallel body diode of AC power AC, switching tube Q4, Figure 19 b, inductance L 2B, electric capacity C6, diode D8, diode D6B form boost circuit; At the negative half-cycle of the alternating voltage that the C phase of AC power AC exports, the first rectifying tube 181C (the K switch 5C in switching tube Q6C, Figure 21 b in Figure 20 b) in the antiparallel body diode of AC power AC, switching tube Q4, Figure 19 b, inductance L 2C, electric capacity C6, diode D8, diode D6C form boost circuit.
In the third working method, the first rectifying tube 181A in Figure 19 b, first rectifying tube 181B and the equal high frequency chopping of the first rectifying tube 181C (the switching tube Q6A in Figure 20 b, switching tube Q6B and the equal high frequency chopping of switching tube Q6C, K switch 5A in Figure 21 b, the equal high frequency chopping of K switch 5B and K switch 5C), switching tube Q5 high frequency chopping, and the first rectifying tube 181A in Figure 19 b, first rectifying tube 181B and the first rectifying tube 181C (switching tube Q6A in Figure 20 b, switching tube Q6B and switching tube Q6C, K switch 5A in Figure 21 b, K switch 5B and K switch 5C) all with switching tube Q5 alternating chopper, therefore, at the negative half-cycle of the alternating voltage that the A phase of AC power AC exports, the first rectifying tube 181A (the K switch 5A in switching tube Q6A, Figure 21 b in Figure 20 b) in AC power AC, the antiparallel body diode of switching tube Q4, Figure 19 b, inductance L 2A, electric capacity C6, diode D8, diode D6A form a boost circuit, AC power AC, switching tube Q5, diode D6A, inductance L 2A, electric capacity C6, diode D8 form another boost circuit.Therefore, at the negative half-cycle of the alternating voltage that the B phase of AC power AC exports, the first rectifying tube 181B (the K switch 5B in switching tube Q6B, Figure 21 b in Figure 20 b) in AC power AC, the antiparallel body diode of switching tube Q4, Figure 19 b, inductance L 2B, electric capacity C6, diode D8, diode D6B form a boost circuit; AC power AC, switching tube Q5, diode D6B, inductance L 2B, electric capacity C6, diode D8 form another boost circuit.Therefore, at the negative half-cycle of the alternating voltage that the C phase of AC power AC exports, the first rectifying tube 181C (the K switch 5C in switching tube Q6C, Figure 21 b in Figure 20 b) in AC power AC, the antiparallel body diode of switching tube Q4, Figure 19 b, inductance L 2C, electric capacity C6, diode D8, diode D6C form a boost circuit; AC power AC, switching tube Q5, diode D6C, inductance L 2C, electric capacity C6, diode D8 form another boost circuit.
The PFC rectifier provided when the embodiment of the present invention is operated in the negative half-cycle of the alternating voltage that AC power AC exports, at PFC inductance, namely when the ripple on inductance L 2A, inductance L 2B, inductance L 2C is identical, switch when adopting the third working method in PFC rectifier or the switching frequency of switching tube minimum, therefore, when adopting the third working method, the switching loss of PFC rectifier is minimum.
Be positive bus-bar electric capacity under the PFC rectifier shown in Figure 19 b is operated in utility mode, i.e. electric capacity C5 energy storage, namely at the positive half period of A cross streams voltage that AC power AC exports, the first rectifying tube 181A in Figure 19 b, the first rectifying tube 181B and the equal conducting of the first rectifying tube 181C, switching tube Q4 high frequency chopping; Therefore, at the positive half period of the alternating voltage that the A phase of AC power AC exports, AC power AC, inductance L 2A, the first rectifying tube 181A, switching tube Q4, the first continued flow tube 182, electric capacity C5 form boost circuit; At the positive half period of the alternating voltage that the B phase of AC power AC exports, AC power AC, inductance L 2B, the first rectifying tube 181B, switching tube Q4, the first continued flow tube 182, electric capacity C5 form boost circuit; At the positive half period of the alternating voltage that the C phase of AC power AC exports, AC power AC, inductance L 2C, the first rectifying tube 181C, switching tube Q4, the first continued flow tube 182, electric capacity C5 form boost circuit.
PFC rectifier shown in Figure 20 b is positive bus-bar electric capacity under being operated in utility mode, i.e. electric capacity C5 energy storage, namely when the positive half period of the alternating voltage that AC power AC exports, the working method of this PFC rectifier is identical with the working method of the PFC rectifier shown in Figure 19 b, its difference is only: the first rectifying tube 181A conducting in Figure 19 b refers to that switching tube Q6A conducting in Figure 20 b or switching tube Q6A turn off, when switching tube Q6A conducting in Figure 20 b, switching tube Q6A and antiparallel body diode thereof are equivalent to the first rectifying tube 181A in Figure 19 b; When the switching tube Q6A in Figure 20 b turns off, the antiparallel body diode of switching tube Q6A is equivalent to the first rectifying tube 181A in Figure 19 b; The first rectifying tube 181B conducting in Figure 19 b refers to that switching tube Q6B conducting in Figure 20 b or switching tube Q6B turn off, and when switching tube Q6B conducting in Figure 20 b, switching tube Q6B and antiparallel body diode thereof are equivalent to the first rectifying tube 181B in Figure 19 b; When the switching tube Q6B in Figure 20 b turns off, the antiparallel body diode of switching tube Q6B is equivalent to the first rectifying tube 181B in Figure 19 b; The first rectifying tube 181C conducting in Figure 19 b refers to that switching tube Q6C conducting in Figure 20 b or switching tube Q6C turn off, and when switching tube Q6C conducting in Figure 20 b, switching tube Q6C and antiparallel body diode thereof are equivalent to the first rectifying tube 181C in Figure 19 b; When the switching tube Q6C in Figure 20 b turns off, the antiparallel body diode of switching tube Q6C is equivalent to the first rectifying tube 181C in Figure 19 b.
PFC rectifier shown in Figure 21 b is negative busbar electric capacity under being operated in utility mode, i.e. electric capacity C6 energy storage, namely when the negative half-cycle of the alternating voltage that AC power AC exports, the working method of this PFC rectifier is identical with the working method of the PFC rectifier shown in Figure 19 b, its difference is only: the first rectifying tube 181A conducting in Figure 19 b refers to that the K switch 5A in Figure 21 b closes or K switch 5A disconnects, when the K switch 5A in Figure 21 b closes, the parallel-connection structure of K switch 5A and diode D6A is equivalent to the first rectifying tube 181A in Figure 19 b; When the K switch 5A in Figure 21 b disconnects, the diode D6A in parallel with K switch 5A is equivalent to the first rectifying tube 181A in Figure 19 b; The first rectifying tube 181B conducting in Figure 19 b refers to that the K switch 5B in Figure 21 b closes or K switch 5B disconnects, and when the K switch 5B in Figure 21 b closes, the parallel-connection structure of K switch 5B and diode D6B is equivalent to the first rectifying tube 181B in Figure 19 b; When the K switch 5B in Figure 21 b disconnects, the diode D6B in parallel with K switch 5B is equivalent to the first rectifying tube 181B in Figure 19 b; The first rectifying tube 181C conducting in Figure 19 b refers to that the K switch 5C in Figure 21 b closes or K switch 5C disconnects, and when the K switch 5C in Figure 21 b closes, the parallel-connection structure of K switch 5C and diode D6C is equivalent to the first rectifying tube 181C in Figure 19 b; When the K switch 5C in Figure 21 b disconnects, the diode D6C in parallel with K switch 5C is equivalent to the first rectifying tube 181C in Figure 19 b.
Preferably, diode D5A in PFC rectifier shown in Figure 19 b also can replace with the switching tube of inverse parallel body diode, or replace with the parallel-connection structure of switch and diode, diode D5B in PFC rectifier shown in Figure 19 b also can replace with the switching tube of inverse parallel body diode, or replace with the parallel-connection structure of switch and diode, diode D5C in PFC rectifier shown in Figure 19 b also can replace with the switching tube of inverse parallel body diode, or replace with the parallel-connection structure of switch and diode, after replacing, the structure of the PFC rectifier shown in Figure 19 b as shown in figure 22b, in Figure 22 b, second rectifying tube 183A, second rectifying tube 183B, second rectifying tube 183C all both can be the switching tube of inverse parallel body diode, also can be the parallel-connection structure of switch and diode.PFC rectifier shown in Figure 22 b is positive bus-bar electric capacity under being operated in utility mode, and namely during electric capacity C5 energy storage, PFC rectifier has three kinds of working methods.
In the first working method, at the positive half period of the A cross streams voltage that AC power AC exports, the first rectifying tube 181A conducting in Figure 22 b, switching tube Q4 high frequency chopping, the second rectifying tube 183A turn off; AC power AC, inductance L 2A, the first rectifying tube 181A, switching tube Q4, the first continued flow tube 182, electric capacity C5 form boost circuit; At the positive half period of the B cross streams voltage that AC power AC exports, the first rectifying tube 181B conducting in Figure 22 b, switching tube Q4 high frequency chopping, the second rectifying tube 183B turn off; AC power AC, inductance L 2B, the first rectifying tube 181B, switching tube Q4, the first continued flow tube 182, electric capacity C5 form boost circuit; At the positive half period of the C cross streams voltage that AC power AC exports, the first rectifying tube 181C conducting in Figure 22 b, switching tube Q4 high frequency chopping, the second rectifying tube 183C turn off; AC power AC, inductance L 2C, the first rectifying tube 181C, switching tube Q4, the first continued flow tube 182, electric capacity C5 form boost circuit.
In the second working method, at the positive half period of the A cross streams voltage that AC power AC exports, the first rectifying tube 181A conducting in Figure 22 b, switching tube Q4 shutoff, the second rectifying tube 183A high frequency chopping; The antiparallel body diode of AC power AC, inductance L 2A, the second rectifying tube 183A, switching tube Q5, the first rectifying tube 181A, the first continued flow tube 182, electric capacity C5 form boost circuit; At the positive half period of the B cross streams voltage that AC power AC exports, the first rectifying tube 181B conducting in Figure 22 b, switching tube Q4 shutoff, the second rectifying tube 183B high frequency chopping; The antiparallel body diode of AC power AC, inductance L 2B, the second rectifying tube 183B, switching tube Q5, the first rectifying tube 181B, the first continued flow tube 182, electric capacity C5 form boost circuit; At the positive half period of the C cross streams voltage that AC power AC exports, the first rectifying tube 181C conducting in Figure 22 b, switching tube Q4 shutoff, the second rectifying tube 183C high frequency chopping; The antiparallel body diode of AC power AC, inductance L 2C, the second rectifying tube 183C, switching tube Q5, the first rectifying tube 181C, the first continued flow tube 182, electric capacity C5 form boost circuit.
In the third working method, at the positive half period of the A cross streams voltage that AC power AC exports, the first rectifying tube 181A conducting in Figure 22 b, switching tube Q4 high frequency chopping, the second rectifying tube 183A high frequency chopping, and switching tube Q4 and the second rectifying tube 183A alternating chopper; AC power AC, inductance L 2A, the first rectifying tube 181A, switching tube Q4, the first continued flow tube 182, electric capacity C5 form a boost circuit; The antiparallel body diode of AC power AC, inductance L 2A, the second rectifying tube 183A, switching tube Q5, the first rectifying tube 181A, the first continued flow tube 182, electric capacity C5 form another boost circuit; At the positive half period of the B cross streams voltage that AC power AC exports, the first rectifying tube 181B conducting in Figure 22 b, switching tube Q4 high frequency chopping, the second rectifying tube 183B high frequency chopping, and switching tube Q4 and the second rectifying tube 183B alternating chopper; AC power AC, inductance L 2B, the first rectifying tube 181B, switching tube Q4, the first continued flow tube 182, electric capacity C5 form a boost circuit; The antiparallel body diode of AC power AC, inductance L 2B, the second rectifying tube 183B, switching tube Q5, the first rectifying tube 181B, the first continued flow tube 182, electric capacity C5 form another boost circuit; At the positive half period of the C cross streams voltage that AC power AC exports, the first rectifying tube 181C conducting in Figure 22 a, switching tube Q4 high frequency chopping, the second rectifying tube 183C high frequency chopping, and switching tube Q4 and the second rectifying tube 183C alternating chopper; AC power AC, inductance L 2C, the first rectifying tube 181C, switching tube Q4, the first continued flow tube 182, electric capacity C5 form a boost circuit; The antiparallel body diode of AC power AC, inductance L 2C, the second rectifying tube 183C, switching tube Q5, the first rectifying tube 181C, the first continued flow tube 182, electric capacity C5 form another boost circuit.
Under the PFC rectifier shown in Figure 22 b is operated in utility mode, for positive bus-bar electric capacity, during i.e. electric capacity C5 energy storage (namely at the positive half period of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Figure 22 b, when the first rectifying tube 181A in Figure 22 b is the switching tube of inverse parallel body diode, the first rectifying tube 181A conducting in Figure 22 b refers to that switching tube conducting or switching tube turn off, when switching tube conducting, switching tube and antiparallel body diode thereof are equivalent to the first rectifying tube 181A in Figure 22 b; When switching tube turns off, the antiparallel body diode of switching tube is equivalent to the first rectifying tube 181A in Figure 22 b.When the first rectifying tube 181A in Figure 22 b is the parallel-connection structure of switch and diode, the first rectifying tube 181A conducting in Figure 22 b refers to that switch closes or switch disconnects, when the switch is closed, the parallel-connection structure of switch and diode is equivalent to the first rectifying tube 181A in Figure 22 b; When the switch in Figure 22 b disconnects, with the first rectifying tube 181A of diode equivalent in Figure 22 b of switch in parallel.Situation when situation during the first rectifying tube 181B conducting in Figure 22 b and the first rectifying tube 181B conducting in Figure 22 b is identical, does not repeat them here.Situation when situation during the first rectifying tube 181C conducting in Figure 22 b and the first rectifying tube 181C conducting in Figure 22 b is identical, does not repeat them here.
Under the PFC rectifier shown in Figure 22 b is operated in utility mode, for positive bus-bar electric capacity, during i.e. electric capacity C5 energy storage (namely at the positive half period of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Figure 22 b, when the second rectifying tube 183A in Figure 22 b is the switching tube of inverse parallel body diode, second rectifying tube 183A turns off and refers to that switching tube turns off, when the second rectifying tube 183A in Figure 22 b is the parallel-connection structure of switch and diode, the second rectifying tube 183A turns off and refers to that switch disconnects.Situation when situation when the second rectifying tube 183B in Figure 22 b turns off turns off with the second rectifying tube 183B in Figure 22 b is identical, does not repeat them here.Situation when situation when the second rectifying tube 183C in Figure 22 b turns off turns off with the second rectifying tube 183C in Figure 22 b is identical, does not repeat them here.
Under the PFC rectifier shown in Figure 22 b is operated in utility mode, for positive bus-bar electric capacity, during i.e. electric capacity C5 energy storage (namely at the positive half period of the alternating voltage that AC power AC exports), in three kinds of working methods of the PFC rectifier shown in Figure 22 b, when the second rectifying tube 183A in Figure 22 b is the switching tube of inverse parallel body diode, second rectifying tube 183A high frequency chopping refers to switching tube high frequency chopping, when the second rectifying tube 183A in Figure 22 b is the parallel-connection structure of switch and diode, the second rectifying tube 183A high frequency chopping refers to switch high-frequency copped wave.Situation when situation during the second rectifying tube 183B high frequency chopping in Figure 22 b and the second rectifying tube 183B high frequency chopping in Figure 22 b is identical, does not repeat them here.Situation when situation during the second rectifying tube 183C high frequency chopping in Figure 22 b and the second rectifying tube 183C high frequency chopping in Figure 22 b is identical, does not repeat them here.
Further, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides is as shown in Figure 23 b, Figure 24 b, Figure 25 b; Wherein, the operation principle of the PFC rectifier shown in Figure 23 b is identical with the operation principle of the PFC rectifier shown in Figure 19 b, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 24 b is identical with the operation principle of the PFC rectifier shown in Figure 20 b, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 25 b is identical with the operation principle of the PFC rectifier shown in Figure 21 b, does not repeat them here.
When Figure 23 b, Figure 24 b or the PFC rectifier shown in Figure 25 b are positive bus-bar capacitance energy storage under being operated in battery mode, in the process of PFC inductance (inductance L 2A, inductance L 2B or inductance L 2C) energy storage, due to switching tube Q4 conducting, the voltage of the positive pole of DC power supply DC is the voltage of voltage after the junction capacitance of diode D6A (diode D6B or diode D6C) and the junction capacitance dividing potential drop of diode D7 of positive bus-bar output BUS+, and, the junction capacitance of diode D7 is larger, and the voltage of the positive pole of DC power supply DC is more close to the voltage of positive bus-bar output BUS+.
Therefore, preferably, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides also comprises the first electric capacity, i.e. electric capacity C9, first electric capacity is in parallel with the first continued flow tube, and now, the PFC rectifier that the embodiment of the present invention provides is as shown in Figure 26 b, Figure 27 b, Figure 28 b; Wherein, the operation principle of the PFC rectifier shown in Figure 26 b is identical with the operation principle of the PFC rectifier shown in Figure 19 b, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 27 b is identical with the operation principle of the PFC rectifier shown in Figure 20 b, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 28 b is identical with the operation principle of the PFC rectifier shown in Figure 21 b, does not repeat them here.
In Figure 26 b, Figure 27 b and Figure 28 b, two ends due to diode D7 are in parallel electric capacity C9, this is equivalent to the junction capacitance increasing diode D7, therefore, when Figure 26 b, Figure 27 b or the PFC rectifier shown in Figure 28 b are positive bus-bar capacitance energy storage under being operated in battery mode, in the process of PFC inductive energy storage, the voltage of the positive pole of DC power supply DC is more close to the voltage of positive bus-bar output BUS+.
Alternatively, when the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is diode, the PFC rectifier that the embodiment of the present invention provides also comprises the first switch, i.e. K switch 6, now, the PFC rectifier that provides of the embodiment of the present invention is as shown in Figure 29 b, Figure 30 b, Figure 31 b.The first switch in Figure 29 b, Figure 30 b or Figure 31 b, namely K switch 6 disconnects when PFC rectifier is operated in utility mode, and now, the first continued flow tube is equivalent to a diode; The first switch in Figure 29 b, Figure 30 b or Figure 31 b, namely K switch 6 is the negative busbar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, and namely disconnect during electric capacity C6 energy storage, now, the first continued flow tube is equivalent to a diode; The first switch in Figure 29 b, Figure 30 b or Figure 31 b, namely K switch 6 is the positive bus-bar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, in the process of i.e. electric capacity C5 energy storage, can disconnect when PFC inductance (inductance L 2A, inductance L 2B or inductance L 2C) releases energy and also can close, now, when K switch 6 disconnects, the first continued flow tube is equivalent to a diode, when K switch 6 closes, the first continued flow tube is equivalent to a section lead.The first switch in Figure 29 b, Figure 30 b or Figure 31 b, namely K switch 6 is the positive bus-bar electric capacity in PFC rectifier under PFC rectifier is operated in battery mode, closed during PFC inductance (inductance L 2A, inductance L 2B or inductance L 2C) stored energy in the process of i.e. electric capacity C5 energy storage, now, the current potential of the positive pole of DC power supply DC equals the voltage of positive bus-bar output BUS+; And Figure 29 b, Figure 30 b or the PFC rectifier shown in Figure 31 b are the positive bus-bar electric capacity in PFC rectifier under being operated in battery mode, in the process of i.e. electric capacity C5 energy storage, when PFC inductance (inductance L 2A, inductance L 2B or inductance L 2C) releases energy, the current potential of the positive pole of DC power supply DC equals the voltage of positive bus-bar output BUS+.
Therefore, under the PFC rectifier shown in Figure 29 b, Figure 30 b and Figure 31 b is operated in battery mode, during for positive bus-bar capacitance energy storage, the current potential of the positive pole of DC power supply DC can not saltus step.
The operation principle of the circuit in the PFC rectifier shown in Figure 29 b except switch K6 is identical with the operation principle of the PFC rectifier shown in Figure 23 b, does not repeat them here; The operation principle of the circuit in the PFC rectifier shown in Figure 30 b except switch K6 is identical with the operation principle of the PFC rectifier shown in Figure 24 b, does not repeat them here; The operation principle of the circuit in the PFC rectifier shown in Figure 31 b except switch K6 is identical with the operation principle of the PFC rectifier shown in Figure 25 b, does not repeat them here.
When the first continued flow tube in the PFC rectifier that the embodiment of the present invention provides is the switching tube of inverse parallel body diode, the PFC rectifier that the embodiment of the present invention provides is as shown in Figure 32 b, Figure 33 b, Figure 34 b.Switching tube Q8 in Figure 32 b, Figure 33 b, the PFC rectifier shown in Figure 34 b and antiparallel body diode thereof are equivalent to diode D7 in Figure 29 b, Figure 30 b and Figure 31 b structure in parallel with K switch 6; Wherein, the antiparallel body diode of switching tube Q8 is equivalent to diode D7, and switching tube Q8 is equivalent to K switch 6.The operation principle of the PFC rectifier shown in Figure 32 b is identical with the operation principle of the PFC rectifier shown in Figure 29 b, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 33 b is identical with the operation principle of the PFC rectifier shown in Figure 30 b, does not repeat them here; The operation principle of the PFC rectifier shown in Figure 34 b is identical with the operation principle of the PFC rectifier shown in Figure 31 b, does not repeat them here.
Certainly, when the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is n phase PFC rectification circuit, the n in PFC rectifier the first rectifying tube can adopt identical structure, also can adopt different structures.Only identical structure is adopted to be described for n the first rectifying tube in the embodiment of the present invention.Certainly, when the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is n phase PFC rectification circuit, the n in PFC rectifier the second rectifying tube can adopt identical structure, also can adopt different structures.Only identical structure is adopted to be described for n the second rectifying tube in the embodiment of the present invention.
A kind of control method that the embodiment of the present invention provides, for controlling the PFC rectifier that the embodiment of the present invention provides, comprising:
When described PFC rectifier is by DC power supply (under namely PFC rectifier is operated in battery mode) and for the first bus capacitor energy storage in described PFC rectifier, control the first main switch to turn off, and control the second main switch conducting, and control described first rectifying tube high frequency chopping;
Wherein, described first main switch is the main switch be directly connected with described first rectifying tube in two main switches of described PFC rectification circuit, and described second main switch is the main switch in two main switches of described PFC rectification circuit except described first main switch; Described first bus capacitor is the positive bus-bar electric capacity of described PFC rectification circuit and the bus capacitor be directly connected with the first continued flow tube in negative busbar electric capacity; Described first continued flow tube is the continued flow tube be directly connected with described first rectifying tube in two continued flow tubes in described PFC rectification circuit.
Wherein, when the positive pole that PFC rectifier is operated in DC power supply under battery mode connects the PFC inductance in PFC rectification circuit, when PFC rectification circuit is Single Phase PFC Rectifier, the first main switch is the switching tube Q2 in any figure in Fig. 2 a, Fig. 3 a, Fig. 4 a, Fig. 6 a, Fig. 7 a, Fig. 8 a, Fig. 9 a, Figure 10 a, Figure 11 a, Figure 12 a, Figure 13 a, Figure 14 a, Figure 15 a, Figure 16 a, Figure 17 a and Figure 18 a, second main switch is the switching tube Q1 in any figure in Fig. 2 a, Fig. 3 a, Fig. 4 a, Fig. 6 a, Fig. 7 a, Fig. 8 a, Fig. 9 a, Figure 10 a, Figure 11 a, Figure 12 a, Figure 13 a, Figure 14 a, Figure 15 a, Figure 16 a, Figure 17 a and Figure 18 a, first bus capacitor is the negative busbar electric capacity in any figure in Fig. 2 a, Fig. 3 a, Fig. 4 a, Fig. 6 a, Fig. 7 a, Fig. 8 a, Fig. 9 a, Figure 10 a, Figure 11 a, Figure 12 a, Figure 13 a, Figure 14 a, Figure 15 a, Figure 16 a, Figure 17 a and Figure 18 a, i.e. electric capacity C2, second bus capacitor is the positive bus-bar electric capacity in any figure in Fig. 2 a, Fig. 3 a, Fig. 4 a, Fig. 6 a, Fig. 7 a, Fig. 8 a, Fig. 9 a, Figure 10 a, Figure 11 a, Figure 12 a, Figure 13 a, Figure 14 a, Figure 15 a, Figure 16 a, Figure 17 a and Figure 18 a, i.e. electric capacity C1, when PFC rectification circuit is three-phase PFC rectification circuit, the first switching tube is figure Figure 19 a, Figure 20 a, Figure 21 a, Figure 22 a, Figure 23 a, Figure 24 a, Figure 25 a, Figure 26 a, Figure 27 a, Figure 28 a, Figure 29 a, Figure 30 a, Figure 31 a, Figure 32 a, switching tube Q5 in any figure in Figure 33 a and Figure 34 a, second switch pipe is Figure 19 a, Figure 20 a, Figure 21 a, Figure 22 a, Figure 23 a, Figure 24 a, Figure 25 a, Figure 26 a, Figure 27 a, Figure 28 a, Figure 29 a, Figure 30 a, Figure 31 a, Figure 32 a, switching tube Q4 in any figure in Figure 33 a and Figure 34 a, the first bus capacitor is Figure 19 a, Figure 20 a, Figure 21 a, Figure 22 a, Figure 23 a, Figure 24 a, Figure 25 a, Figure 26 a, Figure 27 a, Figure 28 a, Figure 29 a, Figure 30 a, Figure 31 a, Figure 32 a, negative busbar electric capacity in any figure in Figure 33 a and Figure 34 a, i.e. electric capacity C6, the second bus capacitor is Figure 19 a, Figure 20 a, Figure 21 a, Figure 22 a, Figure 23 a, Figure 24 a, Figure 25 a, Figure 26 a, Figure 27 a, Figure 28 a, Figure 29 a, Figure 30 a, Figure 31 a, Figure 32 a, positive bus-bar electric capacity in any figure in Figure 33 a and Figure 34 a, i.e. electric capacity C5.
Wherein, when the negative pole that PFC rectifier is operated in DC power supply under battery mode connects the PFC inductance in PFC rectification circuit, when PFC rectification circuit is Single Phase PFC Rectifier, the first main switch is the switching tube Q1 in any figure in Fig. 2 b, Fig. 3 b, Fig. 4 b, Fig. 6 b, Fig. 7 b, Fig. 8 b, Fig. 9 b, Figure 10 b, Figure 11 b, Figure 12 b, Figure 13 b, Figure 14 b, Figure 15 b, Figure 16 b, Figure 17 b and Figure 18 b, second main switch is the switching tube Q2 in any figure in Fig. 2 b, Fig. 3 b, Fig. 4 b, Fig. 6 b, Fig. 7 b, Fig. 8 b, Fig. 9 b, Figure 10 b, Figure 11 b, Figure 12 b, Figure 13 b, Figure 14 b, Figure 15 b, Figure 16 b, Figure 17 b and Figure 18 b, first bus capacitor is the positive bus-bar electric capacity in any figure in Fig. 2 b, Fig. 3 b, Fig. 4 b, Fig. 6 b, Fig. 7 b, Fig. 8 b, Fig. 9 b, Figure 10 b, Figure 11 b, Figure 12 b, Figure 13 b, Figure 14 b, Figure 15 b, Figure 16 b, Figure 17 b and Figure 18 b, i.e. electric capacity C1, second bus capacitor is the negative busbar electric capacity in any figure in Fig. 2 b, Fig. 3 b, Fig. 4 b, Fig. 6 b, Fig. 7 b, Fig. 8 b, Fig. 9 b, Figure 10 b, Figure 11 b, Figure 12 b, Figure 13 b, Figure 14 b, Figure 15 b, Figure 16 b, Figure 17 b and Figure 18 b, i.e. electric capacity C2, when PFC rectification circuit is three-phase PFC rectification circuit, the first switching tube is Figure 19 b, Figure 20 b, Figure 21 b, Figure 22 b, Figure 23 b, Figure 24 b, Figure 25 b, Figure 26 b, Figure 27 b, Figure 28 b, Figure 29 b, Figure 30 b, Figure 31 b, Figure 32 b, switching tube Q4 in any figure in Figure 33 b and Figure 34 b, second switch pipe is Figure 19 b, Figure 20 b, Figure 21 b, Figure 22 b, Figure 23 b, Figure 24 b, Figure 25 b, Figure 26 b, Figure 27 b, Figure 28 b, Figure 29 b, Figure 30 b, Figure 31 b, Figure 32 b, switching tube Q5 in any figure in Figure 33 b and Figure 34 b, the first bus capacitor is Figure 19 b, Figure 20 b, Figure 21 b, Figure 22 b, Figure 23 b, Figure 24 b, Figure 25 b, Figure 26 b, Figure 27 b, Figure 28 b, Figure 29 b, Figure 30 b, Figure 31 b, Figure 32 b, positive bus-bar electric capacity in any figure in Figure 33 b and Figure 34 b, i.e. electric capacity C5, the second bus capacitor is Figure 19 b, Figure 20 b, Figure 21 b, Figure 22 b, Figure 23 b, Figure 24 b, Figure 25 b, Figure 26 b, Figure 27 b, Figure 28 b, Figure 29 b, Figure 30 b, Figure 31 b, Figure 32 b, negative busbar electric capacity in any figure in Figure 33 b and Figure 34 b, i.e. electric capacity C6.
Like this, when the positive pole that PFC rectifier is operated in DC power supply under battery mode connects the PFC inductance in PFC rectification circuit, in the process for negative busbar capacitance energy storage, when PFC inductive energy storage DC power cathode current potential close to or equal the voltage of negative busbar output, in the process for negative busbar capacitance energy storage, when PFC inductance releases energy, the current potential of DC power cathode equals the voltage of negative busbar output, compared to PFC rectification circuit of the prior art, when being negative busbar capacitance energy storage under being operated in battery mode, the jump in potential amplitude of the negative pole of DC power supply reduces, the even current potential of the negative pole of DC power supply no longer saltus step.When the negative pole that PFC rectifier is operated in DC power supply under battery mode connects the PFC inductance in PFC rectification circuit, in the process for positive bus-bar capacitance energy storage, when PFC inductive energy storage DC power anode current potential close to or equal the voltage of positive bus-bar output, in the process for positive bus-bar capacitance energy storage, when PFC inductance releases energy, the current potential of DC power anode equals the voltage of positive bus-bar output, compared to PFC rectification circuit of the prior art, when being positive bus-bar capacitance energy storage under being operated in battery mode, the jump in potential amplitude of the positive pole of DC power supply reduces, the even current potential of the positive pole of DC power supply no longer saltus step.
Further, the control method that the embodiment of the present invention provides, also comprises:
When described PFC rectifier is by DC power supply (under namely PFC rectifier is operated in battery mode) and for the second bus capacitor energy storage in described PFC rectifier, control described first main switch conducting, control described second main switch high frequency chopping, control described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper; Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
Like this, the ripple of the electric current on PFC inductance is identical, can switching frequency be reduced, thus reduce switching loss.
In addition, can certainly when described PFC rectifier be by DC power supply (under namely PFC rectifier is operated in battery mode) and for the second bus capacitor energy storage in described PFC rectifier, control described first main switch conducting, control described second main switch high frequency chopping, control described first rectifying tube and turn off.Can also when described PFC rectifier be by DC power supply (under namely PFC rectifier is operated in battery mode) and for the second bus capacitor energy storage in described PFC rectifier, control described first main switch conducting, control described second main switch to turn off, control described first rectifying tube high frequency chopping.And tank circuit when the second main switch shutoff, the first rectifying tube high frequency chopping, be less than tank circuit when the second main switch high frequency chopping, the first rectifying tube shutoff, loop is less, and conduction loss is also less, and the efficiency of PFC rectifier is also higher.
Further, the control method that the embodiment of the present invention provides, also comprise: when described PFC rectifier is by ac power supply (under namely PFC rectifier is operated in utility mode) and for the second bus capacitor energy storage in described PFC rectifier, control described second main switch high frequency chopping, control described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper;
Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
Like this, the ripple of the electric current on PFC inductance is identical, can switching frequency be reduced, thus reduce switching loss.
In addition, can certainly when described PFC rectifier be by ac power supply (under namely PFC rectifier is operated in utility mode) and for the second bus capacitor energy storage in described PFC rectifier, control described second main switch high frequency chopping, control described first rectifying tube and turn off.Can also when described PFC rectifier be by ac power supply (under namely PFC rectifier is operated in utility mode) and for the second bus capacitor energy storage in described PFC rectifier, control described second main switch to turn off, control described first rectifying tube high frequency chopping.
Further, when the second rectifying tube in the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is the switching tube of inverse parallel body diode, or when being the parallel-connection structure of switch and diode, the control method that the embodiment of the present invention provides, also comprises:
Described PFC rectification circuit by ac power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described first main switch high frequency chopping, control described second rectifying tube high frequency chopping, and described first main switch and described second rectifying tube alternating chopper; Wherein, described second rectifying tube is the rectifying tube in two rectifying tubes in described PFC rectification circuit except described first rectifying tube.
In addition, can certainly when described PFC rectifier be by ac power supply (under namely PFC rectifier is operated in utility mode) and for the first bus capacitor energy storage in described PFC rectifier, control described first main switch high frequency chopping, control described second rectifying tube and turn off.Can also when described PFC rectifier be by ac power supply (under namely PFC rectifier is operated in utility mode) and for the first bus capacitor energy storage in described PFC rectifier, control described first main switch to turn off, control described second rectifying tube high frequency chopping.
In addition, the high frequency chopping mentioned in the embodiment of the present invention, refers to that chopping frequency is higher than mains frequency, is generally more than kHz.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of control device, and the principle of dealing with problems due to this device is similar to aforementioned control method, and therefore the enforcement of this device see the enforcement of preceding method, can repeat part and repeat no more.
A kind of control device that the embodiment of the present invention provides, as shown in figure 35, for controlling the PFC rectifier that the embodiment of the present invention provides, comprising:
First control module 351, for described PFC rectifier by DC power supply and be the first bus capacitor energy storage in described PFC rectifier time, control first main switch turn off;
Second control module 352, for described PFC rectifier by DC power supply and be the first bus capacitor energy storage in described PFC rectifier time, control the second main switch conducting;
3rd control module 353, for described PFC rectifier by DC power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described first rectifying tube high frequency chopping;
Wherein, described first main switch is the main switch be directly connected with described first rectifying tube in two main switches of described PFC rectification circuit, and described second main switch is the main switch in two main switches of described PFC rectification circuit except described first main switch; Described first bus capacitor is the positive bus-bar electric capacity of described PFC rectification circuit and the bus capacitor be directly connected with the first continued flow tube in negative busbar electric capacity; Described first continued flow tube is the continued flow tube be directly connected with described first rectifying tube in two continued flow tubes in described PFC rectification circuit.
Further, the first control module 351, also for described PFC rectifier by DC power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described first main switch conducting;
Second control module 352, also for described PFC rectifier by DC power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described second main switch high frequency chopping;
3rd control module 353, also for when described PFC rectifier is the second bus capacitor energy storage in described PFC rectifier, controls described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper;
Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
Further, the second control module 352, also for described PFC rectifier by ac power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described second main switch high frequency chopping;
3rd control module 353, also for when described PFC rectifier is the second bus capacitor energy storage in described PFC rectifier, controls described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper;
Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
Further, when the switching tube that the second rectifying tube in the PFC rectification circuit in the PFC rectifier that the embodiment of the present invention provides is inverse parallel body diode, or when being the parallel-connection structure of switch and diode, the control device that the embodiment of the present invention provides, as shown in figure 36, the 4th control module 354 is also comprised;
4th control module 354, for described PFC rectification circuit by ac power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described second rectifying tube high frequency chopping;
First control module 351, also for described PFC rectification circuit by ac power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described first main switch high frequency chopping, and described first main switch and described second rectifying tube alternating chopper;
Wherein, described second rectifying tube is the rectifying tube in two rectifying tubes in described PFC rectification circuit except described first rectifying tube.
Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the present invention can by hardware implementing, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, the technical scheme of the embodiment of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (15)

1. a power factor correction PFC rectifier, is characterized in that, comprises PFC rectification circuit;
The first rectifying tube in described PFC rectification circuit is the switching tube of inverse parallel body diode, or is the parallel-connection structure of switch and diode;
Wherein, described first rectifying tube is the rectifying tube be connected with DC power supply in two rectifying tubes of PFC rectification circuit when being operated under battery mode in described PFC rectification circuit; Wherein, time under battery mode, described DC power supply is described PFC rectifier power supply.
2. PFC rectifier as claimed in claim 1, is characterized in that, the first continued flow tube in described PFC rectification circuit is diode or the switching tube for inverse parallel body diode;
Wherein, the first continued flow tube in described PFC rectification circuit is the continued flow tube be directly connected with described first rectifying tube in two continued flow tubes in described PFC rectification circuit.
3. PFC rectifier as claimed in claim 2, it is characterized in that, when the first continued flow tube in described PFC rectification circuit is diode, described PFC rectifier also comprises the first electric capacity, and described first electric capacity is in parallel with described first continued flow tube.
4. PFC rectifier as claimed in claim 2, it is characterized in that, when the first continued flow tube in described PFC rectification circuit is diode, described PFC rectifier also comprises the first switch, and described first switch is in parallel with described first continued flow tube;
Described first switch, for be operated under battery mode at described PFC rectifier be the first bus capacitor energy storage process in PFC inductance storage power time closed; Described first bus capacitor is the positive bus-bar electric capacity of described PFC rectification circuit and the bus capacitor be directly connected with described first continued flow tube in negative busbar electric capacity; And for disconnecting in any one situation when following two kinds of situations: it is the second bus capacitor energy storage under being operated in battery mode that described PFC rectifier is operated in utility mode, described PFC rectifier; Described second bus capacitor is the bus capacitor located in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity beyond described first bus capacitor.
5. PFC rectifier as claimed in claim 1, it is characterized in that, the second rectifying tube in described PFC rectification circuit is the switching tube of inverse parallel body diode, or is the parallel-connection structure of switch and diode; Wherein, described second rectifying tube is the rectifying tube in two rectifying tubes in described PFC rectification circuit except described first rectifying tube.
6. the PFC rectifier as described in as arbitrary in Claims 1 to 4, it is characterized in that, described PFC rectification circuit is Single Phase PFC Rectifier, or is heterogeneous PFC rectification circuit.
7. a uninterrupted power supply, is characterized in that, comprises the arbitrary described power factor correction PFC rectifier of claim 1 ~ 6.
8. a control method, for control as arbitrary in claim 1 ~ 6 as described in PFC rectifier, it is characterized in that, comprising:
Described PFC rectifier by DC power supply and be the first bus capacitor energy storage in described PFC rectifier time, control the first main switch and turn off, and control the second main switch conducting, and control described first rectifying tube high frequency chopping;
Wherein, described first main switch is the main switch be directly connected with described first rectifying tube in two main switches of described PFC rectification circuit, and described second main switch is the main switch in two main switches of described PFC rectification circuit except described first main switch; Described first bus capacitor is the positive bus-bar electric capacity of described PFC rectification circuit and the bus capacitor be directly connected with the first continued flow tube in negative busbar electric capacity; Described first continued flow tube is the continued flow tube be directly connected with described first rectifying tube in two continued flow tubes in described PFC rectification circuit.
9. method as claimed in claim 8, it is characterized in that, described method also comprises:
Described PFC rectifier by DC power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described first main switch conducting, control described second main switch high frequency chopping, control described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper;
Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
10. method as claimed in claim 8, it is characterized in that, described method also comprises:
Described PFC rectifier by ac power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described second main switch high frequency chopping, control described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper;
Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
11. methods as claimed in claim 8, it is characterized in that, the second rectifying tube in described PFC rectification circuit is the switching tube of inverse parallel body diode, or is the parallel-connection structure of switch and diode, and described method also comprises:
Described PFC rectification circuit by ac power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described first main switch high frequency chopping, control described second rectifying tube high frequency chopping, and described first main switch and described second rectifying tube alternating chopper;
Wherein, described second rectifying tube is the rectifying tube in two rectifying tubes in described PFC rectification circuit except described first rectifying tube.
12. 1 kinds of control device, for control as arbitrary in claim 1 ~ 6 as described in PFC rectifier, it is characterized in that, comprising:
First control module, for described PFC rectifier by DC power supply and be the first bus capacitor energy storage in described PFC rectifier time, control first main switch turn off;
Second control module, for described PFC rectifier by DC power supply and be the first bus capacitor energy storage in described PFC rectifier time, control the second main switch conducting;
3rd control module, for described PFC rectifier by DC power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described first rectifying tube high frequency chopping;
Wherein, described first main switch is the main switch be directly connected with described first rectifying tube in two main switches of described PFC rectification circuit, and described second main switch is the main switch in two main switches of described PFC rectification circuit except described first main switch; Described first bus capacitor is the positive bus-bar electric capacity of described PFC rectification circuit and the bus capacitor be directly connected with the first continued flow tube in negative busbar electric capacity; Described first continued flow tube is the continued flow tube be directly connected with described first rectifying tube in two continued flow tubes in described PFC rectification circuit.
13. devices as claimed in claim 12, is characterized in that, described first control module, also for described PFC rectifier by DC power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described first main switch conducting;
Described second control module, also for described PFC rectifier by DC power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described second main switch high frequency chopping;
Described 3rd control module, also for when described PFC rectifier is the second bus capacitor energy storage in described PFC rectifier, controls described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper;
Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
14. devices as claimed in claim 12, it is characterized in that, described second control module, also for described PFC rectifier by ac power supply and be the second bus capacitor energy storage in described PFC rectifier time, control described second main switch high frequency chopping;
Described 3rd control module, also for when described PFC rectifier is the second bus capacitor energy storage in described PFC rectifier, controls described first rectifying tube high frequency chopping, and described second main switch and described first rectifying tube alternating chopper;
Described second bus capacitor is the bus capacitor in the positive bus-bar electric capacity of described PFC rectification circuit and negative busbar electric capacity except described first bus capacitor.
15. devices as claimed in claim 12, it is characterized in that, the second rectifying tube in described PFC rectification circuit is the switching tube of inverse parallel body diode, or is the parallel-connection structure of switch and diode, and described device also comprises the 4th control module;
Described 4th control module, for described PFC rectification circuit by ac power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described second rectifying tube high frequency chopping;
Described first control module, also for described PFC rectification circuit by ac power supply and be the first bus capacitor energy storage in described PFC rectifier time, control described first main switch high frequency chopping, and described first main switch and described second rectifying tube alternating chopper;
Wherein, described second rectifying tube is the rectifying tube in two rectifying tubes in described PFC rectification circuit except described first rectifying tube.
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TWI697181B (en) * 2018-10-22 2020-06-21 亞源科技股份有限公司 Dc-to-dc converter with a power factor correction function

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CN103762630A (en) * 2014-01-03 2014-04-30 深圳科士达科技股份有限公司 Rectifier circuit and UPS system thereof

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CN101685975A (en) * 2008-09-27 2010-03-31 力博特公司 Method and device of soft start of bus voltage in uninterruptible power supply
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