CN109980913B - Switching power supply and voltage output method - Google Patents

Switching power supply and voltage output method Download PDF

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Publication number
CN109980913B
CN109980913B CN201711449487.1A CN201711449487A CN109980913B CN 109980913 B CN109980913 B CN 109980913B CN 201711449487 A CN201711449487 A CN 201711449487A CN 109980913 B CN109980913 B CN 109980913B
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terminal
input
power supply
output
unit
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CN109980913A (en
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林国仙
范杰
周建平
陈建龙
樊珊珊
董秀锋
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/10—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in series, e.g. for multiplication of voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/25—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in series, e.g. for multiplication of voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/0074—Plural converter units whose inputs are connected in series
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention provides a switching power supply and a voltage output method, wherein the switching power supply comprises: the multi-unit series connection PFC circuit comprises a PFC circuit, wherein the output end of the PFC circuit is connected with N buses, an output filter capacitor is connected between two lines in each bus, and N is an integer greater than 1; the input end of the direct current isolation unit is connected with the N buses, a pair of output ends of the direct current isolation unit is respectively connected with a pair of input ends of the auxiliary power supply, and the direct current isolation unit is used for isolating direct current on the input end of the direct current isolation unit; and a pair of input ends of the auxiliary power supply are respectively connected with a pair of output ends of the direct current isolation unit, and an input filter capacitor is connected between the pair of input ends. According to the invention, the technical problems that the output BUS voltages in the switch power supply are mutually influenced and potential safety hazards exist when the system is powered off in the related technology are solved.

Description

Switching power supply and voltage output method
Technical Field
The invention relates to the field of electric power, in particular to a switching power supply and a voltage output method.
Background
With the popularity of cloud computing and big data, the demand of communication power consumption is greatly increased, higher requirements are provided for the reliability, power capacity and performance index of a communication power supply, and high efficiency and high power density are inevitable trends in the development of the communication power supply.
For single-phase ac input, the multi-cell series pfc (power factor correction) has a significant advantage in improving conversion efficiency and power density.
For three-phase ac input, a commonly used PFC circuit (also called PFC topology) is a vienna rectifier, a three-phase six-switch rectifier bridge. The vienna rectifier is a three-level circuit, has high efficiency, is the mainstream scheme of a high-power three-phase converter, and although the vienna rectifier realizes 3 levels, the stress of a fly-wheel diode is still high.
For a traditional switching power supply, a PFC circuit corresponding to a single-phase alternating-current input voltage is a single BUS (BUS) output voltage, and a PFC circuit corresponding to a three-phase alternating-current input voltage is a single-BUS output voltage and a double-BUS output voltage which are directly connected in series, so that an auxiliary power supply directly gets electricity from a BUS. The auxiliary power supply may refer to an auxiliary power supply for the main power topology to normally operate, such as a driving supply voltage, a supply voltage for the control circuit to normally operate, and the like.
The single-phase alternating-current input voltage adopts a multi-unit series PFC circuit and a three-phase rectifier formed by combining a single-phase module of the three-phase alternating-current input voltage, and the three-phase rectifier has the common characteristic that the PFC circuit has a plurality of output BUS voltages, and the BUS voltages are not interconnected, so that the difficulty is brought to the power taking mode of the auxiliary power supply. The circuit design mode of adopting different auxiliary power supplies can possibly cause the condition that the BUS voltage cannot be discharged or the BUS voltage is not equalized.
In view of the above problems in the related art, no effective solution has been found at present.
Disclosure of Invention
The embodiment of the invention provides a switching power supply and a voltage output method.
According to an embodiment of the present invention, there is provided a switching power supply including: the multi-unit series connection PFC circuit comprises a PFC circuit, wherein the output end of the PFC circuit is connected with N buses, an output filter capacitor is connected between two lines in each bus, and N is an integer greater than 1; the input end of the direct current isolation unit is connected with the N buses, a pair of output ends of the direct current isolation unit is respectively connected with a pair of input ends of an auxiliary power supply, and the direct current isolation unit is used for isolating direct current on the input ends of the direct current isolation unit; the pair of input ends of the auxiliary power supply are respectively connected with the pair of output ends of the direct current isolation unit, and an input filter capacitor is connected between the pair of input ends.
According to another embodiment of the present invention, there is provided a voltage output method including: outputting N paths of bus voltage through N output filter capacitors; and after the direct current of the N paths of bus voltages is isolated, the N paths of bus voltages are output to an auxiliary power supply through an input filter capacitor.
According to another embodiment of the present invention, there is provided another voltage output method, which receives an alternating current signal; inputting the alternating current signal to the switching power supply described in the above embodiment; and outputting a direct current signal.
According to yet another embodiment of the present invention, there is also provided a storage medium including a stored program, wherein the program performs any one of the above methods when executed.
According to yet another embodiment of the present invention, there is also provided a processor for executing a program, wherein the program executes to perform the method of any one of the above.
By the invention, the power supply mode does not influence the voltage-sharing of the output BUS voltage of each unit, does not influence the normal work of PFC of the multi-path output BUS voltage, can discharge the output BUS voltage of each unit through the auxiliary power supply when the input alternating voltage AC is disconnected, and can quickly discharge the BUS voltage to 0V when the input voltage of the system is disconnected. The technical problems that in the related art, the output BUS voltages of the switching power supply are mutually influenced and potential safety hazards exist during system power failure are solved, the system is not electrified when being pulled out, the potential safety hazards are avoided, and the power utilization safety environment is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a circuit configuration diagram of a switching power supply according to an embodiment of the present invention;
FIG. 2 is a flow chart of a voltage output method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an auxiliary power supply power-taking mode of a multi-unit series PFC circuit with single-phase ac input according to the present invention;
fig. 4 is a schematic structural diagram illustrating that the output voltage of each unit cannot be discharged due to the power-taking mode of the multi-unit series connection PFC auxiliary power supply provided by the present invention;
fig. 5 is a schematic structural diagram of the voltage-sharing incapability of the output voltages of the units due to the power-taking mode of the auxiliary power supply of the multi-unit series connection PFC circuit provided by the present invention;
fig. 6 is a schematic structural diagram of an auxiliary power supply power-taking mode of a multi-unit series PFC circuit according to the present invention, in which a totem pole bridgeless PFC is a basic unit;
fig. 7 is a schematic structural diagram of a power-taking mode of an auxiliary power supply of a PFC circuit with a three-phase ac input unit circuit module in star connection according to the present invention;
FIG. 8 is a first circuit diagram of a three-phase AC input according to the present invention;
FIG. 9 is a second circuit diagram of a three-phase AC input according to the present invention;
FIG. 10 is a third circuit diagram of a three-phase AC input according to the present invention;
FIG. 11 is a fourth circuit diagram of a three-phase AC input according to the present invention;
fig. 12 is a circuit connection diagram of a three-phase ac input according to the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
The switching power supply of the embodiment of the application can operate in a weak current or strong current scene, can input commercial power and output household or industrial direct current, and can also be applied to an AC-DC conversion (alternating current-direct current conversion) scene.
In this embodiment, a switching power supply is provided, and fig. 1 is a circuit structure diagram of the switching power supply according to an embodiment of the present invention, as shown in fig. 1, including:
the multi-unit series connection PFC circuit 10 is characterized in that the output end of the PFC circuit is connected with N Buses (BUS), an output filter capacitor is connected between two lines in each BUS, and N is an integer greater than 1;
the input end of the direct current isolation unit is connected with the N buses, a pair of output ends of the direct current isolation unit is respectively connected with a pair of input ends of the auxiliary power supply, and the direct current isolation unit is used for isolating direct current on the input end of the direct current isolation unit;
and an auxiliary power supply 14, a pair of input ends of which are respectively connected with a pair of output ends of the direct current isolation unit, and an input filter capacitor is connected between the pair of input ends.
The voltage of each BUS of the PFC with the multi-path output BUS voltage is equal, but the voltages are not equal in potential, the output BUS voltage of each unit is used as the input of the direct current isolation unit, and then the output of the direct current isolation unit is connected with the filter capacitor of the auxiliary power supply and then used as the input of the auxiliary power supply.
Among the correlation technique, switching power supply generally need have many output BUS voltage, and each output BUS voltage of PFC circuit does not have the lug connection, and the output BUS voltage of each unit will guarantee the voltage-sharing again, on this basis, when still guaranteeing input alternating voltage AC disconnection, the output BUS voltage of each unit can be in time quick releases to guarantee maintenance personal's safety, this just brings the difficulty for auxiliary power source electricity-taking mode.
Through the scheme of this embodiment, get the electric mode and neither influence the voltage-sharing of the output BUS voltage of each unit, do not influence the PFC normal work of multiplexed output BUS voltage, can be when input alternating voltage AC breaks off again in addition, let off the output BUS voltage of each unit through auxiliary power supply, when system input voltage breaks off, each BUS voltage also can discharge to 0V rapidly. The technical problems that in the related art, the output BUS voltages of the switching power supply are mutually influenced and potential safety hazards exist during system power failure are solved, the system is not electrified when being pulled out, the potential safety hazards are avoided, and the power utilization safety environment is improved.
Optionally, the PFC circuit may be, but is not limited to: the device comprises a single-phase input alternating current voltage PFC circuit and a three-phase input alternating current voltage PFC circuit.
When the PFC circuit is a single-phase input ac voltage PFC circuit, the single-phase input ac voltage PFC circuit includes: the AC-DC converter comprises a single-phase input alternating-current voltage source, a boosting inductor and N input series-connected AC-DC converters, wherein the input end of a Kth AC-DC converter in the N AC-DC converters is connected with the output end of a Kth AC-DC converter, the output end of the Kth AC-DC converter is connected with the input end of a Kth +1 th AC-DC converter, the input end of the 1 st AC-DC converter is connected with the boosting inductor, the output end of the last AC-DC converter is connected with the single-phase input alternating-current voltage source, and K is more than or equal to 2 and less than or equal to N-1.
Optionally, a pair of output ends of each AC-DC converter is respectively connected to two lines of one bus, wherein a positive output end of the pair of output ends of each AC-DC converter is connected to a positive stage of one output filter capacitor, and a negative output end of the pair of output ends of each AC-DC converter is connected to a negative stage of one output filter capacitor.
Optionally, the dc isolation unit includes: the direct current isolation circuit comprises N pairs of switching tubes, wherein each pair of switching tubes is connected with one bus, the anode of one switching tube in each pair of switching tubes is connected with the anode of an output filter capacitor connected between two lines of one bus, and the cathode of the other switching tube in each pair of switching tubes is connected with the cathode of the output filter capacitor connected between two lines of one bus.
Alternatively, the switching tube may be, but is not limited to: diode, MOS pipe, insulated gate bipolar transistor IGBT.
When the PFC circuit is a three-phase input ac voltage PFC circuit, the three-phase input ac voltage PFC circuit includes: the three-phase input alternating current PFC circuit forms a loop with the direct current isolation unit and the auxiliary power supply, wherein the unit circuit module is connected with the direct current isolation unit, and the three-phase voltage source comprises an a terminal, a b terminal and a c terminal.
Optionally, the unit circuit module is a multi-port network including one input port and N output ports, and the N output ports are connected to the dc isolation unit, where the input port includes two input terminals and each of the N output ports includes two output terminals.
Optionally, the unit circuit module is formed by connecting N modular unit circuits in series, a second input terminal of a kth modular unit circuit is connected to a first input terminal of a (K + 1) th modular unit circuit, a second input terminal of the kth modular unit circuit is connected to a first input terminal of a (K + 1) th modular unit circuit, each modular unit circuit is a two-port network, the first input terminal of each modular unit circuit and the second input terminal of each modular unit circuit form an input port, the first output terminal of each modular unit circuit and the second output terminal of each modular unit circuit form an output port, and K is greater than or equal to 2 and less than or equal to N-1.
Optionally, the three-phase voltage source a terminal is connected to the first terminal of the first energy storage inductor, the second terminal of the first energy storage inductor is connected to the first input terminal of the first unit circuit module, the three-phase voltage source b terminal is connected to the first terminal of the second energy storage inductor, the second terminal of the second energy storage inductor is connected to the first input terminal of the second unit circuit module, the three-phase voltage source c terminal is connected to the first terminal of the third energy storage inductor, the second terminal of the third energy storage inductor is connected to the first input terminal of the third unit circuit module, and the first unit circuit module, the second unit circuit module and the second input terminal of the third unit circuit module are connected to a point. The three-phase voltage source, the energy storage inductor and the unit circuit module are connected in a star shape.
Optionally, the three-phase voltage source terminal a is connected to the first terminal of the first energy storage inductor, the second terminal of the first energy storage inductor is connected to the first input terminal of the first unit circuit module, and the second input terminal of the first unit circuit module is connected to the three-phase voltage source terminal b; the three-phase voltage source b terminal is connected with the first terminal of the second energy storage inductor, the second terminal of the second energy storage inductor is connected with the first input terminal of the second unit circuit module, and the second input terminal of the second unit circuit module is connected with the three-phase voltage source c terminal; and a three-phase voltage source c terminal is connected with a first terminal of a third energy storage inductor, a second terminal of the third energy storage inductor is connected with a first input terminal of a third unit circuit module, and a second input terminal of the third unit circuit module is connected with a three-phase voltage source a terminal. The three-phase voltage source, the energy storage inductor and the unit circuit module are connected in a triangular mode.
Optionally, the dc isolation unit comprises one of: diode, MOS pipe, IGBT.
Optionally, the N output filter capacitors are not connected, the potentials of the N output filter capacitors are not equal, and the potential difference between the two ends of each capacitor of the N output filter capacitors is equal. The N output filter capacitors correspond to different capacitance values.
Optionally, the input end of the PFC circuit is connected to an ac power supply.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
Example 2
In the present embodiment, a voltage output method is provided, and fig. 2 is a flowchart of a voltage output method according to an embodiment of the present invention, as shown in fig. 2, including:
s202, outputting N paths of bus voltages through N output filter capacitors;
and S204, after the direct current of the N paths of bus voltages is isolated, the N paths of bus voltages are output to the auxiliary power supply through the input filter capacitor.
Optionally, outputting the N bus voltages through the N output filter capacitors includes one of: the single-phase input alternating current voltage PFC circuit outputs N paths of bus voltages through N output filter capacitors; the three-phase input alternating current voltage PFC circuit outputs N paths of bus voltages through N output filter capacitors.
In this embodiment, another voltage output method is provided, including: s302, receiving an alternating current signal; s304, inputting an alternating current signal to the switching power supply of any example of embodiment 1; and S306, outputting the direct current signal.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
Example 3
The circuit of the PFC with the multiple output BUS voltages of the present embodiment is a PFC circuit of a single-phase input ac voltage, and the PFC circuit is a single-phase input ac voltage PFC circuit.
Fig. 3 is a schematic diagram of a power-taking mode of an auxiliary power supply of a multi-unit series PFC circuit with single-phase AC input according to the present invention, where the auxiliary power supply of the present embodiment includes a single-phase input AC voltage AC, L, N AC-DC power converters with input inductors, N AC-DC output power supply filter capacitors, 2N switching tubes, an auxiliary power supply circuit, and an auxiliary power supply input filter capacitor. Where AC-DC can be seen as a two-port network, the inputs are connected in series and then the outputs are connected to respective filter capacitors.
One end of single-phase input alternating current voltage AC is connected with one end of a boosting inductor L in series, one end of a first AC-DC converter is connected with the other end of the boosting inductor L in input mode, the other end of the first AC-DC converter is connected with one end of a second AC-DC converter in input mode, that is, the input terminals of the first AC-DC converter and the second AC-DC converter are connected in series, the other input terminal of the second AC-DC converter is connected to one terminal of the third, i.e. the inputs of the second AC-DC converter and the third AC-DC converter are also connected in series, by analogy, the input ends of the (N-1) th AC-DC converter and the (N) th AC-DC converter are also connected in series, and the other input end of the (N) th AC-DC converter is connected with the other end of the input alternating voltage AC. The output filter capacitors of the AC-DC conversion units are respectively connected with the output ends of the AC-DC conversion units, wherein the positive end output of the AC-DC conversion units is connected with the positive end of the output filter capacitor, the negative end of the AC-DC conversion units is connected with the negative end of the output filter capacitor, and the output filter capacitors filter and store energy for the output voltage of the AC-DC conversion units.
Output filter capacitor C of first AC-DC conversion unit1Positive terminal and switch tube D1Series connected output filter capacitor C of second AC-DC conversion unit3Positive terminal and switch tube D3In series connection and the like, the output filter capacitor C of the Nth AC-DC conversion unit2N-1Positive terminal and switch tube D2N-1Series, switch tube D1、D3、……、D2N-1Is connected together with the other end of the auxiliary power supply input filter capacitor CPAre connected to each other.
Output filter capacitor C of first AC-DC conversion unit1Negative terminal of (D) and switch tube (D)2Output filter of series-connected, second AC-DC conversion unitWave capacitor C2Negative terminal of (D) and switch tube (D)4In series connection and the like, the output filter capacitor C of the Nth AC-DC conversion unitNNegative terminal of (D) and switch tube (D)2NSeries, switch tube D2、D4、……、D2NIs connected together with the other end of the auxiliary power supply input filter capacitor CPIs connected to the negative terminal.
When the system is just powered on, the input alternating voltage AC passes through the first AC-DC conversion unit and the switch tube D1And a switching tube D2NAnd the Nth AC-DC conversion unit inputs a filter capacitor C to the auxiliary power supplyPCharging, and enabling the auxiliary power supply to start normal work; when the system is working normally, the switch tube D1And switch D2NOnly when the instantaneous value of the input Alternating Current (AC) voltage is larger than the voltage of the input filter capacitor of the auxiliary power supply, the AC voltage is switched on, and the AC voltage is switched off at other times so as to reduce the switching loss, and other switching tubes are in an off state, so that the power taking mode of the auxiliary power supply cannot influence the balance of the output voltages of all the AC-DC conversion units; when the input alternating voltage AC is powered off and the voltage on the input filter capacitor of the auxiliary power supply is smaller than the voltage on the output filter capacitor of each AC-DC conversion unit, D2i-1And D2iThe switch tube is conducted, and the voltage on the output filter capacitor of the ith AC-DC conversion unit is discharged through the auxiliary power supply, so that the potential danger of electric shock cannot be brought to maintenance personnel.
Fig. 4 is a schematic structural diagram of a structure in which the output voltage of each unit cannot be discharged due to a power-taking mode of the multi-unit series PFC auxiliary power supply provided by the present invention, which is further described below with reference to fig. 4.
Fig. 4 is different from fig. 3 in the power-taking manner of the auxiliary power supply, and the auxiliary power supply is supplied with the input ac voltage from the front through the dc isolation unit. There are two strategies in fig. 4, one of which is the solid line portion shown in fig. 4, directly from the input AC voltage AC through the dc isolation unit and then to power the auxiliary power supply; in the other case, as shown in the dotted line in fig. 4, the input AC voltage AC passes through the boost inductor and then passes through the dc isolation unit to supply power to the auxiliary power supply. In fig. 4, whether the solid line method or the dotted line method is adopted, after the input AC voltage AC is disconnected, the power of the auxiliary power supply is quickly completed, and the output voltage of each AC-DC conversion unit cannot be discharged to 0V, that is, there is residual voltage on each AC-DC conversion unit, which may cause danger to maintenance personnel.
Fig. 5 is a schematic structural diagram of a structure that voltage balancing of output voltages of each unit cannot be achieved due to an auxiliary power supply power-taking mode of a multi-unit series connection PFC circuit provided by the invention, and fig. 5 is a mode that power is directly taken from one of multiple output BUSs like the output voltage of a traditional single BUS, so that the problem of unbalanced load of the output voltage of each BUS occurs when the output voltage is light load, and voltage balancing of each output BUS cannot be achieved. The problem that the normal work cannot be realized and the other output BUS voltages cannot be discharged after the system is powered off is solved.
Fig. 6 is a schematic structural diagram of an auxiliary power supply power-taking mode of a multi-unit series PFC circuit according to the present invention, in which totem pole bridgeless PFC is used as a basic unit, and fig. 6 is a specific embodiment of the auxiliary power supply power-taking mode of the multi-unit series PFC circuit according to the present invention, in which totem pole bridgeless PFC is used as a basic unit, and other existing PFC circuits such as a bridgeless dual BOOST circuit or a bidirectional switch BOOST circuit may be used as a basic unit of the present invention. As further described below in conjunction with fig. 6.
Fig. 6 shows that the input AC voltage AC and the boost inductor L are connected in series with three totem-pole bridgeless PFC as basic unit inputs, and in this embodiment, a diode is used as a switching tube to explain the operation process. The positive terminals of the output filter capacitors C1, C2 and C3 of the respective conversion units in fig. 6 are connected to the anodes of diodes D1, D3 and D5, respectively, and then the cathodes of the diodes D1, D3 and D5 are connected to the auxiliary power input filter capacitor CPThe positive electrodes of the two electrodes are connected; the negative terminals of the output filter capacitors C1, C2 and C3 of the respective conversion units are connected to the cathodes of diodes D2, D4 and D6, respectively, and then the anodes of the diodes D2, D4 and D6 are connected to the input filter capacitor C of the auxiliary power supplyPAre connected with each other.
Next, the power supply mode of the auxiliary power supply and the input voltage of each conversion unit are cut off according to FIG. 6The discharge circuit is illustrated when on. Since the positive and negative half cycles of the input ac voltage are symmetrical, the description will be made with respect to the positive half cycle of the input ac voltage. When the peak value of the input voltage is larger than the auxiliary power supply input filter capacitor CPWhen the voltage is over, the input alternating voltage passes through the body diode of the boosting inductor L, Q1 and the body diodes of D1, D6 and Q12 to input the filter capacitor C to the auxiliary power supplyPCharging, namely, the diodes D2, D3, D4 and D5 are cut off in the reverse direction and do not participate in the work; when the peak value of the input voltage is smaller than the auxiliary power supply input filter capacitor CPAt the time of voltage application, the auxiliary power supply is input into the filter capacitor CPIs higher than the voltages at the respective conversion cells C1, C2, and C3, the diodes D1, D2, D3, D4, D5, and D6 are all turned off in the reverse direction; when the input alternating current voltage AC is disconnected and the voltage on the auxiliary power supply input filter capacitor is smaller than the voltages of C1, C2 and C3, diodes D1 and D2, D3 and D4, D5 and D6 are respectively conducted in the forward direction, and the voltages on capacitors C1, C2 and C3 are respectively discharged to the auxiliary power supply.
Example 4
The present embodiment provides an embodiment of a power-taking method for an auxiliary power supply of a PFC circuit with a star-connected three-phase ac input unit circuit module, where the PFC circuit is a three-phase ac input voltage PFC circuit, fig. 7 is a schematic structural diagram of the power-taking method for the auxiliary power supply of the PFC circuit with the star-connected three-phase ac input unit circuit module provided by the present invention, and the following description is further detailed with reference to fig. 7.
The PFC circuit of the three-phase input alternating-current voltage comprises the following modules: the device comprises a three-phase voltage source, an energy storage inductor, a unit circuit module, a direct current isolation unit, an auxiliary power input filter capacitor and an auxiliary power circuit.
The three-phase voltage source has three output terminals, designated a, b, c, respectively. The unit circuit block is a multi-port network including an input port including first and second input terminals and N output ports (N >0), and the kth output port includes two terminals of K1 and K2, and similarly the nth port includes two terminals of N1 and N2. The energy storage inductor comprises a first terminal and a second terminal.
The unit circuit module is formed by connecting N modular unit circuits in series, a second input terminal of a first modular unit circuit is connected with a first input terminal of a second modular unit circuit, and a second input terminal of a kth modular unit circuit is connected with a first input terminal of a (k + 1) th modular unit circuit. The first input terminal of the first modular unit circuit is referred to as the first input terminal of the unit circuit module, the second input terminal of the nth modular unit circuit is referred to as the second input terminal of the unit circuit module, the first output terminal of the first modular unit circuit is referred to as the output terminal 11 of the unit circuit module, the second output terminal of the first modular unit circuit is referred to as the output terminal 12 of the unit circuit module, similarly, the first output terminal of the kth modular unit circuit is referred to as the output terminal k1 of the unit circuit module, the second output terminal of the kth modular unit circuit is referred to as the output terminal k2 of the unit circuit module, the first output terminal up to the nth modular unit circuit is referred to as the output terminal N1 of the unit circuit module, and the second output terminal of the nth modular unit circuit is referred to as the output terminal N2 of the unit circuit module.
The modular unit circuit is a two-port network, the first input terminal and the second input terminal form an input port, and the first output terminal and the second output terminal form an output port.
All output terminals of the modularized unit are connected with the direct current isolation unit, and the output of the direct current isolation unit is used as the input of the auxiliary power circuit after being filtered by the auxiliary power input filter capacitor.
The direct current isolation unit can be a direct current isolation unit formed by a diode, an MOS (metal oxide semiconductor) transistor, an IGBT (insulated gate bipolar transistor) or a TVS (transient voltage suppressor) transistor and the like.
The three-phase voltage source, the energy storage inductor and the unit circuit module are connected in a star shape.
The star connection mode is as follows: and a three-phase voltage source a terminal is connected with a first terminal of a first energy storage inductor, and a second terminal of the first energy storage inductor is connected with a first input terminal of the first unit circuit module. And the terminal b of the three-phase voltage source is connected with the first terminal of the second energy storage inductor, and the second terminal of the second energy storage inductor is connected with the first input terminal of the second unit circuit module. The three-phase voltage source c terminal is connected with the first terminal of the third energy storage inductor, the second terminal of the third energy storage inductor is connected with the first input terminal of the third unit circuit module, and the second input terminals of the first unit circuit module, the second unit circuit module and the third unit circuit module are connected to one point.
Fig. 8 is a circuit connection diagram of a three-phase ac input according to the first embodiment of the present invention, in which a three-phase voltage source, an energy storage inductor, and a unit circuit module are connected in a star shape, and an auxiliary power supply power taking manner is an auxiliary power supply power taking manner in which a totem-pole bridgeless PFC is used as a basic unit, fig. 8 is a specific embodiment in which the totem-pole bridgeless PFC is used as a basic unit, fig. 9 is a circuit connection diagram of a three-phase ac input according to the second embodiment of the present invention, fig. 9 is an embodiment of interleaving and parallel connection performed on the basis of fig. 8, fig. 10 is a circuit connection diagram of a three-phase ac input according to the third embodiment of the present invention, and fig. 10 is an embodiment in which a coupling inductor is interleaved and parallel connected on the basis of interleaving and parallel connection of fig. 9.
Fig. 11 is a circuit connection diagram of a three-phase ac input according to the present invention, in which three-phase voltage sources, energy storage inductors, unit circuit modules are connected in a delta configuration, fig. 12 is a circuit connection diagram of a three-phase ac input according to the present invention, an auxiliary power supply power-taking manner is an auxiliary power supply power-taking manner of a totem-pole bridgeless PFC basic unit, and fig. 11 and 12 are embodiments of an auxiliary power supply power-taking manner of a PFC circuit according to the present invention, in which three-phase ac input is connected in a delta configuration with unit circuit modules. Fig. 11 and fig. 7 have the same point that the circuit is composed of unit module circuits, and the difference is that the three-phase voltage source, the energy storage inductor and the unit circuit modules are connected in a different manner, and are connected in a triangular manner.
The triangular connection mode is as follows: a three-phase voltage source terminal a is connected with a first terminal of a first energy storage inductor, a second terminal of the first energy storage inductor is connected with a first input terminal of a first unit circuit module, and a second input terminal of the first unit circuit module is connected with a three-phase voltage source terminal b; the three-phase voltage source b terminal is connected with a first terminal of a second energy storage inductor, a second terminal of the second energy storage inductor is connected with a first input terminal of a second unit circuit module, and a second input terminal of the second unit circuit module is connected with the three-phase voltage source c terminal; and the terminal c of the three-phase voltage source is connected with the first terminal of a third energy storage inductor, the second terminal of the third energy storage inductor is connected with the first input terminal of a third unit circuit module, and the second input terminal of the third unit circuit module is connected with the terminal a of the three-phase voltage source.
Example 5
An embodiment of the present invention further provides a storage medium including a stored program, where the program executes any one of the methods described above.
Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:
s1, outputting N-path bus voltage through N output filter capacitors;
and S2, after the direct current of the N paths of bus voltages is isolated, the N paths of bus voltages are output to an auxiliary power supply through an input filter capacitor.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Embodiments of the present invention also provide a processor configured to execute a program, where the program executes to perform any of the steps in the method.
Optionally, in this embodiment, the program is configured to perform the following steps:
s1, outputting N-path bus voltage through N output filter capacitors;
and S2, after the direct current of the N paths of bus voltages is isolated, the N paths of bus voltages are output to an auxiliary power supply through an input filter capacitor.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims (19)

1. A switching power supply, comprising:
the multi-unit series connection PFC circuit comprises a PFC circuit, wherein the output end of the PFC circuit is connected with N buses, an output filter capacitor is connected between two lines in each bus, and N is an integer greater than 1;
the input end of the direct current isolation unit is connected with the N buses, a pair of output ends of the direct current isolation unit is respectively connected with a pair of input ends of an auxiliary power supply, and the direct current isolation unit is used for isolating direct current on the input ends of the direct current isolation unit;
the pair of input ends of the auxiliary power supply are respectively connected with the pair of output ends of the direct current isolation unit, and an input filter capacitor is connected between the pair of input ends of the auxiliary power supply.
2. The switching power supply according to claim 1, wherein each of the N output filter capacitors is not connected, and the potentials of the N output filter capacitors are not equal, and the potential difference across each of the N output filter capacitors is equal.
3. The switching power supply of claim 1, wherein the PFC circuit comprises one of: the device comprises a single-phase input alternating current voltage PFC circuit and a three-phase input alternating current voltage PFC circuit.
4. The switching power supply according to claim 3, wherein the single-phase input AC voltage PFC circuit comprises: the AC-DC converter comprises a single-phase input alternating-current voltage source, a boost inductor and N alternating-current-direct-current (AC-DC) converters, wherein the single-phase input alternating-current voltage source, the boost inductor and the N input alternating-current-direct-current (AC-DC) converters are connected in series, the first input end of the Kth AC-DC converter in the N AC-DC converters is connected with the second input end of the K-1 th AC-DC converter, the second input end of the Kth AC-DC converter is connected with the first input end of the K +1 th AC-DC converter, the first input end of the 1 st AC-DC converter is connected with the boost inductor, the second input end of the last AC-DC converter is connected with the single-phase input alternating-current voltage source, and K is less than or equal to 2 and less than or equal to N-1.
5. The switching power supply according to claim 4, wherein a pair of output terminals of each of said AC-DC converters are respectively connected to two lines of one of said buses, wherein a positive output terminal of a pair of output terminals of each of said AC-DC converters is connected to a positive stage of one of said output filter capacitors, and a negative output terminal of a pair of output terminals of each of said AC-DC converters is connected to a negative stage of said one of said output filter capacitors.
6. The switching power supply according to claim 4, wherein the DC isolation unit comprises: the direct current isolation circuit comprises N pairs of switching tubes, wherein each pair of switching tubes is connected with one path of bus, the anode of one switching tube in each pair of switching tubes is connected with the anode of the output filter capacitor connected between two lines in one path of bus, and the cathode of the other switching tube in each pair of switching tubes is connected with the cathode of the output filter capacitor connected between two lines in one path of bus.
7. The switching power supply according to claim 6, wherein the switching tube comprises one of: diode, MOS pipe, insulated gate bipolar transistor IGBT.
8. The switching power supply according to claim 3, wherein the three-phase input AC voltage PFC circuit comprises: the three-phase input alternating current PFC circuit forms a loop with the direct current isolation unit and the auxiliary power supply, wherein the unit circuit module is connected with the direct current isolation unit, and the three-phase voltage source comprises an a terminal, a b terminal and a c terminal.
9. The switching power supply according to claim 8, wherein the unit circuit module of each phase is a multi-port network including one input port and a plurality of output ports, and the unit circuit modules of three phases are multi-port networks having a total of N output ports connected to the dc isolation unit, wherein the input port includes two input terminals and each of the N output ports includes two output terminals.
10. The switching power supply according to claim 9, wherein the unit circuit module of each phase is composed of a plurality of modular unit circuits connected in series, the unit circuit modules of three phases have N modular unit circuits in total, a first input terminal of a k-th modular unit circuit is connected to a second input terminal of a k-1 th modular unit circuit, a second input terminal of a k-th modular unit circuit is connected to a first input terminal of a k +1 th modular unit circuit, each of the modular unit circuits is a two-port network, the first input terminal of each of the modular unit circuits and the second input terminal of each of the modular unit circuits constitute an input port, the first output terminal of each of the modular unit circuits and the second output terminal of each of the modular unit circuits constitute an output port, k ≦ N-1.
11. The switching power supply according to claim 8, wherein a three-phase voltage source a terminal is connected to a first terminal of a first energy storage inductor, a second terminal of the first energy storage inductor is connected to a first input terminal of a first unit circuit module, a three-phase voltage source b terminal is connected to a first terminal of a second energy storage inductor, a second terminal of the second energy storage inductor is connected to a first input terminal of a second unit circuit module, a three-phase voltage source c terminal is connected to a first terminal of a third energy storage inductor, a second terminal of the third energy storage inductor is connected to a first input terminal of a third unit circuit module, and second input terminals of the first unit circuit module, the second unit circuit module and the third unit circuit module are connected to a point.
12. The switching power supply according to claim 8, wherein a three-phase voltage source a terminal is connected to a first terminal of a first energy storage inductor, a second terminal of the first energy storage inductor is connected to a first input terminal of a first unit circuit module, and a second input terminal of the first unit circuit module is connected to a three-phase voltage source b terminal; the three-phase voltage source b terminal is connected with a first terminal of a second energy storage inductor, a second terminal of the second energy storage inductor is connected with a first input terminal of a second unit circuit module, and a second input terminal of the second unit circuit module is connected with the three-phase voltage source c terminal; and the terminal c of the three-phase voltage source is connected with the first terminal of a third energy storage inductor, the second terminal of the third energy storage inductor is connected with the first input terminal of a third unit circuit module, and the second input terminal of the third unit circuit module is connected with the terminal a of the three-phase voltage source.
13. The switching power supply according to claim 8, wherein the dc isolation unit comprises one of: diode, MOS pipe, IGBT.
14. The power supply of claim 1, wherein the input terminal of the PFC circuit is connected to an ac power source.
15. A voltage output method implemented based on the switching power supply according to any one of claims 1 to 14, comprising:
outputting N paths of bus voltage through N output filter capacitors;
and after the direct current of the N paths of bus voltages is isolated, the N paths of bus voltages are output to an auxiliary power supply through an input filter capacitor.
16. The method of claim 15, wherein outputting the N bus voltages through the N output filter capacitors comprises one of:
the single-phase input alternating current voltage PFC circuit outputs N paths of bus voltages through N output filter capacitors;
the three-phase input alternating current voltage PFC circuit outputs N paths of bus voltages through N output filter capacitors.
17. A voltage output method, comprising:
receiving an alternating current signal;
inputting the alternating current signal to the switching power supply of any one of claims 1 to 14;
and outputting a direct current signal.
18. A storage medium comprising a stored program, wherein the program when executed performs the method of any one of claims 15 to 17.
19. A processor, configured to run a program, wherein the program when running performs the method of any one of claims 15 to 17.
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