CN113972822B - Power factor correction circuit, control method thereof, medium, compressor and air conditioner - Google Patents

Power factor correction circuit, control method thereof, medium, compressor and air conditioner Download PDF

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Publication number
CN113972822B
CN113972822B CN202010710984.8A CN202010710984A CN113972822B CN 113972822 B CN113972822 B CN 113972822B CN 202010710984 A CN202010710984 A CN 202010710984A CN 113972822 B CN113972822 B CN 113972822B
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China
Prior art keywords
unit
module
switching
switch
turned
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CN202010710984.8A
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Chinese (zh)
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CN113972822A (en
Inventor
徐锦清
文先仕
张杰楠
钟雄斌
曾贤杰
胡斌
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Priority to CN202010710984.8A priority Critical patent/CN113972822B/en
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Classifications

    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • 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
    • H02M7/219—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 in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • 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

Abstract

The invention discloses a totem pole power factor correction circuit, a control method thereof, a medium, a compressor and an air conditioner. The totem pole power factor correction circuit comprises a rectification module, an inductance module, a capacitance module, a switch module and a control module, wherein the control module is used for controlling the rectification module and the switch module to work in a high-frequency switch mode or a synchronous rectification mode according to working parameters of the load. When the totem pole power factor correction circuit works in a high-frequency switch mode, the totem pole power factor correction circuit can control the input current waveform to follow the change of input voltage, so that the input current harmonic wave and the power factor are improved, the bus voltage is raised, and the boost output is realized; when the totem pole power factor correction circuit works in the synchronous rectification mode, voltage doubling output can be achieved, so that the totem pole power factor correction circuit can achieve the functions of voltage boosting and voltage doubling, adapt to voltage requirements of different working parameters of loads, and keep high efficiency advantages of the power factor correction circuit. The invention is widely applied to the technical field of electronic power.

Description

Power factor correction circuit, control method thereof, medium, compressor and air conditioner
Technical Field
The invention relates to the technical field of electronic power, in particular to a totem pole power factor correction circuit, a control method thereof, a medium, a compressor and an air conditioner.
Background
In the existing electronic power technology, in order to obtain a higher power factor, a PFC (Power Factor Correction ) circuit is commonly used to provide a bus voltage. Some existing pfc circuits have a boosting effect, that is, the output voltage of the pfc circuit is higher than the input voltage, but when the output voltage needs to be doubled, that is, the output voltage is twice the input voltage, the existing pfc circuits need to use more switching devices, and it is difficult to achieve higher working efficiency, so in the prior art, when there is a need of boosting and voltage doubling, a pfc circuit and a special voltage doubling circuit need to be provided. The high complexity of the circuit will result in high cost of use and high failure rate.
Disclosure of Invention
Aiming at least one technical problem, the invention aims to provide a totem pole power factor correction circuit, a control method thereof, a medium, a compressor and an air conditioner, which have the functions of boosting and multiplying voltage so as to adapt to voltage requirements under different working parameters.
A totem pole power factor correction circuit according to an embodiment of the first aspect of the present invention includes:
the rectifying module comprises a plurality of unidirectional conduction units which are connected in a bridge shape, and each unidirectional conduction unit is connected in parallel with a switch unit respectively; the input end of the rectifying module is used for being connected to an alternating current power supply, and the output end of the rectifying module is used for being connected to a load;
the inductance module is arranged between the rectification module and the alternating current power supply;
the capacitor module comprises a first capacitor and a second capacitor which are connected in series; the capacitor module is connected with the output end of the rectifying module in parallel;
the switch module is connected with one input end of the rectifying module, and the other end of the switch module is connected with a connecting point of the first capacitor and the second capacitor;
and the control module is used for controlling the rectifying module and the switching module to work in a high-frequency switching mode or a synchronous rectifying mode according to the working parameters of the load.
The totem pole power factor correction circuit according to the embodiment of the first aspect of the invention has at least the following beneficial effects: the rectification module and the switching module can switch between a high-frequency switching mode and a synchronous rectification mode through the control of the control module, and when the high-frequency switching mode is operated, the totem pole power factor correction circuit can control the input current waveform to follow the change of input voltage, so that the input current harmonic wave and the power factor are improved, the bus voltage is raised, and the boost output is realized; when the totem pole power factor correction circuit works in the synchronous rectification mode, the totem pole power factor correction circuit can realize voltage doubling output, so that the totem pole power factor correction circuit can realize the functions of voltage boosting and voltage doubling, adapt to the voltage requirements of different working parameters of loads, and can keep the high efficiency advantage of the power factor correction circuit.
According to some embodiments of the invention, the rectifying module includes a first unidirectional conducting unit, a second unidirectional conducting unit, a third unidirectional conducting unit, a fourth unidirectional conducting unit, a first switching unit, a second switching unit, a third switching unit, and a fourth switching unit;
the first unidirectional conduction unit is connected with the first switch unit in parallel, the second unidirectional conduction unit is connected with the second switch unit in parallel, the third unidirectional conduction unit is connected with the third switch unit in parallel, and the fourth unidirectional conduction unit is connected with the fourth switch unit in parallel;
the positive pole of the first unidirectional conduction unit is connected with the negative pole of the second unidirectional conduction unit, the positive pole of the third unidirectional conduction unit is connected with the negative pole of the fourth unidirectional conduction unit, the negative pole of the first unidirectional conduction unit is connected with the negative pole of the third unidirectional conduction unit, the positive pole of the second unidirectional conduction unit is connected with the positive pole of the fourth unidirectional conduction unit, the negative pole of the first unidirectional conduction unit and the positive pole of the second unidirectional conduction unit are the output ends of the rectifying module, and the positive pole of the first unidirectional conduction unit and the positive pole of the third unidirectional conduction unit are the input ends of the rectifying module.
The switch units in the rectifying module can receive the control signals output by the control module to rectify the input current of the alternating current power supply so as to improve the harmonic wave and the power factor of the input current.
According to some embodiments of the invention, the control module comprises:
an alternating voltage detection unit for detecting a voltage waveform of the alternating current power supply;
the direct-current voltage detection unit is used for detecting the bus voltage of the load;
a current detection unit for detecting a current in the rectification module;
the parameter detection unit is used for detecting the working parameters of the load;
the main control unit is connected with the alternating voltage detection unit, the current detection unit and the parameter detection unit and is used for determining to work in the high-frequency switching mode or the synchronous rectification mode according to the working parameters of the load and controlling the rectification module and the switching module according to the voltage waveform of the alternating current power supply and the current in the rectification module so as to realize the high-frequency switching mode or the synchronous rectification mode.
The rectifying module of the embodiment of the invention has the functions of voltage measurement, current measurement and load working parameter measurement, and can control the rectifying module and the switching module according to the measured voltage, current and load working parameters so as to realize the high-frequency switching mode or the synchronous rectifying mode.
According to some embodiments of the invention, the determining, according to the operation parameter of the load, to operate in the high-frequency switching mode or the synchronous rectification mode specifically includes:
when the working parameter of the load is in a first working parameter interval, determining to work in the high-frequency switch mode;
when the working parameters of the load are in a second working parameter interval, determining to work in the synchronous rectification mode; the lower limit value in the second working parameter interval is larger than the upper limit value of the first working parameter interval.
According to the embodiment of the invention, the totem-pole power factor correction circuit is determined to work in a high-frequency switch mode or a synchronous rectification mode according to the working parameters of the load, so that the totem-pole power factor correction circuit can adapt to the voltage requirement of the load.
According to some embodiments of the invention, in the synchronous rectification mode:
the switch module is conducted;
when the first unidirectional conduction unit has current flowing through, the first switch unit is turned on, otherwise, the first switch unit is turned off;
when the second unidirectional conduction unit has current flowing through, the second switch unit is turned on, otherwise, the second switch unit is turned off;
The third switching unit and the fourth switching unit are turned off.
In the embodiment of the invention, under the synchronous rectification mode, the totem-pole power factor correction circuit can realize voltage doubling output.
According to some embodiments of the invention, in the high frequency switch mode:
the switch module is turned off;
the first switch unit and the second switch unit are alternately switched on and off in the whole period of the voltage waveform of the alternating current power supply;
in the positive half cycle of the voltage waveform of the alternating current power supply, the third switching unit is turned off, and the fourth switching unit is turned on;
in the negative half period of the voltage waveform of the alternating current power supply, the third switching unit is turned on, and the fourth switching unit is turned off.
According to some embodiments of the present invention, the first switch unit and the second switch unit are alternately turned on and off, and specifically include:
the first switch unit is controlled by a PWM signal to be switched on and switched off;
the second switch unit is controlled to be switched on and switched off by the reverse phase signal of the PWM signal;
the duty cycle of the PWM signal is determined by the voltage waveform of the ac power source, the bus voltage of the load, and the operating parameters of the load.
In the embodiment of the invention, under the synchronous rectification mode, the totem-pole power factor correction circuit can realize boost output.
According to some embodiments of the invention, the switching module includes a fifth switching unit, a fifth unidirectional conducting unit, a sixth unidirectional conducting unit, a seventh unidirectional conducting unit, and an eighth unidirectional conducting unit;
the positive electrode of the fifth unidirectional conduction unit and the negative electrode of the sixth unidirectional conduction unit are connected in series to form a first branch;
the positive electrode of the seventh unidirectional conduction unit and the negative electrode of the eighth unidirectional conduction unit are connected in series to form a second branch;
the first branch, the second branch and the fifth switching unit are connected in parallel;
the positive electrode of the fifth unidirectional conduction unit is connected with the positive electrode of the third unidirectional conduction unit;
the positive electrode of the seventh unidirectional conduction unit is connected with the connection point of the first capacitor and the second capacitor;
when the rectifying module and the switching module work in a high-frequency switching mode, the fifth switching unit is turned off;
when the rectifying module and the switching module work in a synchronous rectifying mode, the fifth switching unit is conducted.
The switch module in the embodiment of the invention also has a rectifying function and can rectify the current flowing through the switch module.
According to some embodiments of the invention, the operating parameter is load power, load current or load frequency.
According to the embodiment of the invention, the load power, the load current or the load frequency can be selected as the working parameter according to the characteristics of the load so as to determine a high-frequency switching mode or a synchronous rectification mode, thereby better meeting the voltage requirement of the load.
According to some embodiments of the invention, the totem pole power factor correction circuit further comprises an eleventh unidirectional conduction unit and a twelfth unidirectional conduction unit; the eleventh unidirectional conduction unit is connected between one end of the capacitor module and one output end of the rectifying module, and the twelfth unidirectional conduction unit is connected between the other end of the capacitor module and the other output end of the rectifying module.
According to the embodiment of the invention, the eleventh unidirectional conduction unit and the twelfth unidirectional conduction unit are arranged between the two ends of the capacitor module and the output end of the rectifying module, so that current backflow can be prevented when the voltage of the alternating current power supply AC is lower than the bus voltage of a load, and the circuit safety is protected.
According to a second aspect of the present invention, a control method for controlling a totem pole power factor correction circuit of the first aspect of the present invention includes:
acquiring working parameters of the load, and controlling the rectifying module and the switching module to work in a high-frequency switching mode or a synchronous rectifying mode according to the working parameters;
In the synchronous rectification mode:
the switch module is conducted;
when the first unidirectional conduction unit has current flowing through, the first switch unit is turned on, otherwise, the first switch unit is turned off;
when the second unidirectional conduction unit has current flowing through, the second switch unit is turned on, otherwise, the second switch unit is turned off;
the third switching unit and the fourth switching unit are turned off;
in the high frequency switching mode:
the switch module is turned off;
the first switch unit and the second switch unit are alternately switched on and off in the whole period of the voltage waveform of the alternating current power supply;
in the positive half cycle of the voltage waveform of the alternating current power supply, the third switching unit is turned off, and the fourth switching unit is turned on;
in the negative half period of the voltage waveform of the alternating current power supply, the third switching unit is turned on, and the fourth switching unit is turned off.
The control method according to the embodiment of the second aspect of the present invention has at least the following advantages: the rectification module and the switching module can switch between a high-frequency switching mode and a synchronous rectification mode through the control of the control module, and when the high-frequency switching mode is operated, the totem pole power factor correction circuit can control the input current waveform to follow the change of input voltage, so that the input current harmonic wave and the power factor are improved, the bus voltage is raised, and the boost output is realized; when the totem pole power factor correction circuit works in the synchronous rectification mode, the totem pole power factor correction circuit can realize voltage doubling output, so that the totem pole power factor correction circuit can realize the functions of voltage boosting and voltage doubling, adapt to the voltage requirements of different working parameters of loads, and can keep the high efficiency advantage of the power factor correction circuit.
A storage medium according to an embodiment of the third aspect of the present invention has stored therein processor-executable instructions which, when executed by a processor, are for performing the control method of the embodiment of the second aspect of the present invention.
The storage medium according to the embodiment of the third aspect of the present invention has at least the following advantageous effects: the control method can be executed in a computer automation mode, so that the operation efficiency is improved.
According to a fourth aspect of the present invention, a compressor includes:
a totem pole power factor correction circuit according to a first embodiment of the present invention;
the input end of the inverter is connected with the output end of the rectifying module in the totem pole power factor correction circuit;
and the motor is connected with the output end of the inverter.
An air conditioner according to an embodiment of a fifth aspect of the present invention includes a compressor according to an embodiment of a fourth aspect of the present invention.
The compressor according to the fourth aspect of the present invention and the air conditioner according to the fifth aspect of the present invention have at least the following advantageous effects: the current harmonic wave and the power factor are improved, and the motor can be switched to work in a synchronous rectification mode or a high-frequency switch mode according to the weight of the motor load, so that the voltage requirements under different loads can be met by selecting the boosting and voltage doubling.
Drawings
Fig. 1 is a schematic diagram of a totem pole power factor correction circuit according to an embodiment of the present invention;
fig. 2 is a simplified schematic diagram of a totem pole pfc circuit according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of a control signal output by a control module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an equivalent structure of the circuit of FIG. 2 according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an equivalent structure of the circuit of FIG. 2 in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of an equivalent structure of the circuit of FIG. 5 in accordance with an embodiment of the present invention;
FIG. 7 is a schematic diagram of an equivalent structure of the circuit of FIG. 5 in accordance with an embodiment of the present invention;
FIG. 8 is a schematic diagram of an equivalent structure of the circuit of FIG. 2 in accordance with an embodiment of the present invention;
FIG. 9 is a schematic diagram of a switch module according to an embodiment of the invention;
FIG. 10 is a schematic diagram of a switch module according to an embodiment of the invention;
FIG. 11 is a schematic diagram of a switch module according to an embodiment of the invention;
FIG. 12 is a circuit diagram of a compressor in accordance with an embodiment of the present invention;
fig. 13 is a schematic diagram of a totem pole power factor correction circuit with an eleventh unidirectional conducting unit and a twelfth unidirectional conducting unit according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, a totem pole power factor correction circuit is provided, which includes a rectifying module, an inductance module, a capacitance module, a switching module, and a control module.
In an embodiment of the invention, the rectifying module comprises a plurality of unidirectional conducting units and a plurality of switching units, wherein the unidirectional conducting units are connected into a bridge shape, and each unidirectional conducting unit is connected with one switching unit in parallel. In the embodiment of the invention, a diode can be used as a unidirectional conduction unit, and other devices with unidirectional conduction capability can be used as unidirectional conduction units; devices with controlled on-off capability such as transistors, field effect transistors or insulated gate bipolar transistors may be used as switching elements.
In the embodiment of the invention, the rectifying module includes a first unidirectional conduction unit D1, a second unidirectional conduction unit D2, a third unidirectional conduction unit D3, a fourth unidirectional conduction unit D4, a first switching unit Q1, a second switching unit Q2, a third switching unit Q3, and a fourth switching unit Q4. The unidirectional conduction unit is connected into a bridge shape, namely the positive electrode of the first unidirectional conduction unit D1 is connected with the negative electrode of the second unidirectional conduction unit D2, the positive electrode of the third unidirectional conduction unit D3 is connected with the negative electrode of the fourth unidirectional conduction unit D4, the negative electrode of the first unidirectional conduction unit D1 is connected with the negative electrode of the third unidirectional conduction unit D3, and the positive electrode of the second unidirectional conduction unit D2 is connected with the positive electrode of the fourth unidirectional conduction unit D4. Each unidirectional conducting unit is respectively connected with one switching unit in parallel, namely a first unidirectional conducting unit D1 is connected with a first switching unit Q1 in parallel, a second unidirectional conducting unit D2 is connected with a second switching unit Q2 in parallel, a third unidirectional conducting unit D3 is connected with a third switching unit Q3 in parallel, and a fourth unidirectional conducting unit D4 is connected with a fourth switching unit Q4 in parallel.
In the embodiment of the invention, in the rectifying module formed by the first unidirectional conduction unit D1, the first switching unit Q1 and other devices, the negative electrode of the first unidirectional conduction unit D1 and the positive electrode of the second unidirectional conduction unit D2 are output ends of the rectifying module, and the positive electrode of the first unidirectional conduction unit D2 and the positive electrode of the third unidirectional conduction unit D3 are input ends of the rectifying module.
Referring to fig. 1, an input terminal of the rectifying module is connected to an alternating current power source AC through an inductance module L, and an output terminal of the rectifying module is connected to a load. The output end of the rectifying module is connected with the capacitance module in parallel. In an embodiment of the invention, the capacitive module comprises a first capacitor C1 and a second capacitor C2 connected in series. The switch module SW is bridged between one input end of the rectifying module and the capacitor module, specifically, one end of the switch module SW is connected with the positive electrode of the third unidirectional conduction unit D3 in the rectifying module, and the other end of the switch module SW is connected with the connection point of the first capacitor C1 and the second capacitor C2. The switch module SW has two states of on and off, when the switch module SW is turned on, the connection point between the positive electrode of the third unidirectional conduction unit D3 and the first capacitor C1 and the second capacitor C2 is turned on, and when the switch module SW is turned off, the connection point between the positive electrode of the third unidirectional conduction unit D3 and the first capacitor C1 and the second capacitor C2 is turned off.
Referring to fig. 1, the control module has functions of detecting an operation parameter of a load, detecting a voltage waveform of an ac power source, and detecting a current input into the rectification module by the ac power source; the control module has a control function, and can select to work in a high-frequency switching mode or a synchronous rectification mode according to the detected working parameters of the load, wherein the high-frequency switching mode or the synchronous rectification mode is realized by the combination of the on-off states of the first switching unit Q1, the second switching unit Q2, the third switching unit Q3, the fourth switching unit Q4 and the switching module SW, and the control module outputs control signals such as PWM waveforms and the like to the first switching unit Q1, the second switching unit Q2, the third switching unit Q3, the fourth switching unit Q4 and the switching module SW, and can control the combination of the on-off states of the first switching unit Q1, the second switching unit Q2, the third switching unit Q3, the fourth switching unit Q4 and the switching module SW, so that the rectification module and the switching module work in the high-frequency switching mode or the synchronous rectification mode.
Specifically, referring to fig. 1, the control module includes an ac voltage detection unit, a dc voltage detection unit, a current detection unit, a parameter detection unit, and a main control unit. The alternating voltage detection unit can be a voltage sensor for detecting a voltage waveform of the alternating current power supply; the dc voltage detecting unit may be a voltage sensor for detecting a bus voltage of a load, for example, a voltage across the capacitor module in fig. 1; the current detection unit may be a current sensor for detecting a current flowing through the rectification module; the parameter detecting unit may be a power meter or a current sensor, and when the load is a motor, the parameter detecting unit may be a frequency sensor, which may detect the power, current, pressure or frequency of the load, respectively, i.e. the operating parameter detected by the parameter detecting unit includes one of the power, current or frequency.
The main control unit can be a singlechip, and is connected with the alternating current voltage detection unit, the direct current voltage detection unit, the current detection unit and the parameter detection unit, so that the voltage waveform of the alternating current power supply, the voltage of a load bus, the current flowing through the rectification module and the working parameters of the load detected by the units are received. The main control unit is also connected to the control end of the first switch unit Q1, the control end of the second switch unit Q2, the control end of the third switch unit Q3, the control end of the fourth switch unit Q4, and the control end of the switch module SW through IO interfaces, respectively, and the connection between the main control unit and the control end of the first switch unit Q1 is not specifically shown in fig. 1, but an arrow symbol is used to indicate that the main control unit outputs control signals to them.
The main control unit firstly determines whether the rectification module and the switching module need to be controlled to work in a high-frequency switching mode or a synchronous rectification mode according to the working parameters of a load by calling the control program operated by the main control unit, and then drives the first switching unit Q1, the second switching unit Q2, the third switching unit Q3, the fourth switching unit Q4 and the switching module SW to carry out on-off state conversion by executing the corresponding waveforms to form different on-off state combinations, so that the rectification module and the switching module work in the high-frequency switching mode or the synchronous rectification mode.
Referring to fig. 1, the internal resistances of the ac voltage detecting unit and the dc voltage detecting unit are larger, that is, they are connected in parallel to the circuit and can be regarded as an open circuit, the internal resistances of the current detecting unit are smaller, and they are connected in series to the circuit and can be regarded as a short circuit, while the main control unit in fig. 1 mainly acts as a control signal output from the main control unit to the first switching unit Q1 and so on, so that the control module can be omitted from the drawing, and a more concise illustration as shown in fig. 2 is obtained, that is, the first switching unit Q1, the second switching unit Q2, the third switching unit Q3, the fourth switching unit Q4 and the switching module SW in fig. 2 receive the control signal output from the control module, and perform the conversion of the on-off states, so as to form different on-off state combinations, thereby making the rectifying module and the switching module operate in a high-frequency switching mode or a synchronous rectifying mode.
In the embodiment of the invention, the control module determines to control the rectifying module and the switching module to work in a high-frequency switching mode or a synchronous rectifying mode according to the working parameters of the load. Specifically, the control module sets a sequentially increasing operating parameter threshold value P 1 、P 2 、P 3 And P 4 I.e. P 1 ＜P 2 ＜P 3 ＜P 4 Forming a first working parameter interval [ P ] 1 ,P 2 ]And a second operating parameter interval [ P ] 3 ,P 4 ]. If the operating parameter of the load is within the first operating parameter interval P 1 ,P 2 ]In the second operating parameter interval [ P ], the control module determines to control the rectifying module and the switching module to operate in the high-frequency switching mode if the operating parameter of the load is within the second operating parameter interval [ P ] 3 ,P 4 ]The control module determines that the control rectification module and the switching module operate in synchronous rectification mode.
The left half of fig. 3 illustrates waveforms of control signals output by the control module to each of the switching units and the switching modules in the rectification module when the control module determines to control the rectification module and the switching module to operate in the high-frequency switching mode, and the right half of fig. 3 illustrates waveforms of control signals output by the control module to each of the switching units and the switching modules in the rectification module when the control module determines to control the rectification module and the switching module to operate in the synchronous rectification mode.
In fig. 3, Q1 denotes a control signal waveform output to the first switching unit Q1, Q2 denotes a control signal waveform output to the second switching unit Q2, Q3 denotes a control signal waveform output to the third switching unit Q3, Q4 denotes a control signal waveform output to the fourth switching unit Q4, and SW denotes a control signal waveform output to the switching module SW. In the embodiment of the invention, the high level output by the control module received by the switch module or the switch unit can be turned on, and the low level output by the control module received by the switch module or the switch unit can be turned off.
Us in fig. 3 represents a voltage waveform across the AC power supply AC, is represents a voltage waveform of the AC power supply AC input to the rectifying module.
When the control module is to control the rectifying module and the switching module to work in the high-frequency switching mode, referring to the left half part of fig. 3, the control module outputs a low level to the switching module SW so that the switching module SW is turned off; when the control module detects that the voltage waveform of the ac power supply is in the positive half cycle, the control module outputs a low level to the third switching unit Q3 and outputs a high level to the fourth switching unit Q4, so that the third switching unit Q3 is turned off and the fourth switching unit Q4 is turned on, that is, when the voltage waveform of the ac power supply is in the positive half cycle, the circuit topology structure shown in fig. 2 is shown in the form of fig. 4. When the control module detects that the voltage waveform of the ac power supply is in the negative half cycle, the control module outputs a high level to the third switching unit Q3 and outputs a low level to the fourth switching unit Q4, so that the third switching unit Q3 is turned on and the fourth switching unit Q4 is turned off, that is, when the voltage waveform of the ac power supply is in the negative half cycle, the circuit topology structure shown in fig. 2 is shown in the form of fig. 5.
The control module collects the voltage waveform output by the AC power supply AC, and obtains the PWM waveform equivalent to the voltage waveform of the AC power supply AC by determining the duty ratio of the PWM waveform according to the voltage waveform of the AC power supply AC by sampling and comparing the voltage waveform by an internal analog circuit or by executing an algorithm by a digital circuit, for example, by a real-time calculation method, a regular sampling method or an irregular sampling method. In the embodiment of the present invention, the voltage waveform of the AC power source AC may be a sine wave, that is, the PWM waveform obtained by the control module may be an SPWM waveform. The control module takes the obtained PWM waveform as a control waveform output to the first switching unit Q1 and the second switching unit Q2.
In an embodiment of the present invention, the PWM waveform output to the first switching unit Q1 and the PWM waveform output to the second switching unit Q2 by the control module are inverted. Referring to fig. 3, the duty ratio of the PWM waveform output from the control module to the first switching unit Q1 is minimum at the voltage zero crossing point, and is maximum at the voltage peak/valley, and the duty ratio of the PWM waveform output from the control module to the second switching unit Q2 is maximum at the voltage zero crossing point, and is minimum at the voltage peak/valley.
In the embodiment of the present invention, the frequency of the PWM waveform may be determined according to the device types of the first and second switching units Q1 and Q2. For example, if field effect transistors are used as the first and second switching units Q1 and Q2, the frequency of the PWM waveform may be 30Khz to 100Khz, and if insulated gate bipolar transistors are used as the first and second switching units Q1 and Q2, the frequency of the PWM waveform may be 3Khz to 30Khz.
The first switching unit Q1 and the second switching unit Q2 are alternately turned on and off at a high frequency during the full period of the voltage waveform of the ac power supply under the driving of the PWM waveform. Referring to fig. 3, the PWM waveform driving the first switching unit Q1 is opposite in phase to the PWM waveform driving the second switching unit Q2, so that the second switching unit Q2 is turned off when the first switching unit Q1 is turned on and the second switching unit Q2 is turned on when the first switching unit Q1 is turned off during the alternating on-off of the first switching unit Q1 and the alternating on-off of the second switching unit Q2. Taking the circuit shown in fig. 5 as an example, the voltage output by the AC power supply AC is negative half cycle, in this embodiment, the voltage of the negative electrode of the fourth unidirectional conduction unit D4 is higher than the voltage of the positive electrode of the first unidirectional conduction unit D1, when the first switching unit Q1 is turned on and the second switching unit Q2 is turned off, the topology structure of the circuit shown in fig. 5 is equivalent to that shown in fig. 6, at this time, two ends of the inductance module L are connected with the AC power supply AC, the AC power supply AC charges the inductance module L, and the capacitance module supplies power to the load; when the first switching unit Q1 is turned off and the second switching unit Q2 is turned on, the topology structure of the circuit shown in fig. 5 is equivalent to that shown in fig. 7, at this time, the inductance module L, the first capacitor C1 and the second capacitor C2 are connected in series, the inductance module L discharges to charge the first capacitor C1 and the second capacitor C2, and the inductance module L also discharges to supply power to the load. In both topologies of fig. 6 and fig. 7, the capacitor module can obtain a voltage higher than the output voltage of the AC power supply AC, so as to achieve a boosting effect, and since the control waveform outputted from the second switching unit Q2 when the control module Is turned on to the first switching unit Q1 Is a PWM waveform corresponding to the voltage waveform of the AC power supply AC, the waveform of the current Is inputted to the rectifying module by the AC power supply AC Is also a sine wave, thereby improving the input current harmonic wave and the power factor.
The circuit equivalent topologies shown in fig. 6 and 7 are based on an analysis of fig. 5, i.e. the case where the output voltage of the alternating current source AC is in the negative half cycle. Because of the symmetry of the circuit, when the output voltage of the AC power supply AC Is in the positive half period, i.e. the circuit shown in fig. 4, the same conclusion can be obtained by analyzing, i.e. the two ends of the capacitor module can obtain a voltage higher than the output voltage of the AC power supply AC, so as to realize the boosting effect, and the waveform of the current Is input into the rectifying module by the AC power supply AC Is also a sine wave, thereby improving the input current harmonic wave and the power factor.
When the control module is to control the rectifying module and the switching module to work in the synchronous rectifying mode, referring to the right half part of fig. 3, the control module outputs a high level to the switching module SW so that the switching module SW is turned on; the control module outputs a high level to the switching module SW, and the control module outputs a low level to the third switching unit Q3 and the fourth switching unit Q4, so that the third switching unit Q3 and the fourth switching unit Q4 are turned off, the circuit topology shown in fig. 2 is equivalent to that shown in fig. 8, and in the structure shown in fig. 8, the first unidirectional conducting unit D1 and the second unidirectional conducting unit D2 can be independently controlled by the control module, thereby performing synchronous rectification.
As can be seen from the circuit structure shown in fig. 8, as the positive and negative half cycles of the AC power source AC are switched, the current flowing through the rectifying module flows through either the first unidirectional conductive unit D1 or the second unidirectional conductive unit D2, and the control module can determine whether the current flows through the first unidirectional conductive unit D1 or the second unidirectional conductive unit D2 according to the current direction.
When the control module detects that the first unidirectional conduction unit D1 has current flowing through, the control module outputs a high level to the first switching unit Q1 so that the first switching unit Q1 is conducted, and if the control module does not detect that the first unidirectional conduction unit D1 has current flowing through, the control module outputs a low level to the first switching unit Q1 so that the first switching unit Q1 is turned off. When the control module detects that the second unidirectional conduction unit D2 has current flowing through, the control module outputs a high level to the second switching unit Q2 so that the second switching unit Q2 is conducted, and if the control module does not detect that the second unidirectional conduction unit D2 has current flowing through, the control module outputs a low level to the second switching unit Q2 so that the second switching unit Q2 is turned off. When the first switch unit Q1 is turned on and the second switch unit Q2 is turned off, the alternating current power AC is equivalent to that the alternating current power AC is connected to two ends of the first capacitor C1 through the inductance module L to charge the first capacitor C1; when the first switching unit Q1 is turned off and the second switching unit Q2 is turned on, the AC power AC is connected to two ends of the second capacitor C2 through the inductance module L, so as to charge the second capacitor C2. The voltage of the alternating current capacitor AC can be obtained at the two ends of the first capacitor C1 and the two ends of the second capacitor C2 respectively, and the capacitor module formed by connecting the first capacitor C1 and the second capacitor C2 in series can obtain the voltage which is equivalent to twice the output voltage of the alternating current capacitor AC at the two ends of the capacitor module, so that the voltage doubling effect is realized.
The advantages of the high-frequency switching mode or the synchronous rectification mode and the advantages of the high-frequency switching mode and the synchronous rectification mode are determined by the control module according to the working parameters, and the beneficial effects of the totem pole power factor correction circuit in the embodiment of the invention can be summarized: when the working parameters such as the power, the current, the pressure or the frequency of the load are in the smaller first working parameter interval [ P ] 1 ,P 2 ]The internal load is light load, and under the control of the control module, the rectification module and the switching module work in a high-frequency switching mode, so that the totem pole power factor correction circuit can control the input current waveform to follow the change of input voltage, thereby improving the input current harmonic wave and the power factor, raising the bus voltage and realizing the boost output; when the working parameters such as the power, the current, the pressure or the frequency of the load are in the larger second working parameter interval [ P ] 3 ,P 4 ]And under the control of the control module, the rectification module and the switch module work in a synchronous rectification mode, so that the totem pole power factor correction circuit can realize voltage doubling output and has stronger load carrying capacity.The totem-pole power factor correction circuit in the embodiment of the invention can realize the functions of boosting and voltage doubling, is suitable for the voltage requirements of different working parameters of loads, and can maintain the high efficiency advantage of the power factor correction circuit.
In the embodiment of the invention, the switch module can be switched between on and off states under the control of the control module, and one switch unit or two switch units can be used for constructing the switch module in the embodiment of the invention.
In an embodiment of the present invention, a switching module may be constructed using one switching unit as shown in fig. 9. The switching module SW in the circuit of fig. 2 is replaced with a circuit composed of a fifth switching unit Q5, a fifth unidirectional conduction unit D5, a sixth unidirectional conduction unit D6, a seventh unidirectional conduction unit D7 and an eighth unidirectional conduction unit D8, so as to obtain the circuit shown in fig. 9.
In the circuit shown in fig. 9, the positive electrode of the fifth unidirectional conducting unit D5 and the negative electrode of the sixth unidirectional conducting unit D6 are connected in series to form a first branch, the positive electrode of the seventh unidirectional conducting unit D7 and the negative electrode of the eighth unidirectional conducting unit D8 are connected in series to form a second branch, and the first branch, the second branch and the fifth switching unit Q5 are connected in parallel. The positive electrode of the fifth unidirectional conducting unit D5 is connected with the positive electrode of the third unidirectional conducting unit D3, and the positive electrode of the seventh unidirectional conducting unit D7 is connected with the connection point of the first capacitor C1 and the second capacitor C2, that is, the circuit formed by the fifth switching unit Q5, the fifth unidirectional conducting unit D5, the sixth unidirectional conducting unit D6, the seventh unidirectional conducting unit D7 and the eighth unidirectional conducting unit D8 in fig. 9 is equivalent to the switching module SW in fig. 2.
In the circuit shown in fig. 9, the fifth unidirectional conducting unit D5, the sixth unidirectional conducting unit D6, the seventh unidirectional conducting unit D7 and the eighth unidirectional conducting unit D8 form a full-bridge rectifier, and the full-bridge rectifier is capable of rectifying the current flowing through the fifth switching unit Q5.
An output terminal of the control module is connected to a control terminal of the fifth switching unit Q5. The connection lines between the fifth switching unit Q5 and the control module are omitted in the circuit shown in fig. 9.
In the circuit shown in fig. 9, the on-off state of the fifth switching unit Q5 determines the on-off state of the switching module SW, that is, the fifth switching unit Q5 is turned on to turn on the switching module SW, and the fifth switching unit Q5 is turned off to turn off the switching module SW.
In the embodiment of the invention, when the control module determines that the control rectification module and the switching module work in the high-frequency switching mode, the control module outputs a low level to the fifth switching unit Q5 so that the fifth switching unit is turned off, and therefore, the equivalent switching module SW is turned off to realize the high-frequency switching mode. When the control module determines that the control rectification module and the switching module work in the synchronous rectification mode, the control module outputs a high level to the fifth switching unit Q5 so that the fifth switching unit is conducted, and therefore the equivalent switching module SW is conducted to realize the synchronous rectification mode.
In an embodiment of the present invention, a switching module may be constructed using two switching units as shown in fig. 10. The switching module SW in the circuit of fig. 2 is replaced with a circuit composed of a sixth switching unit Q6, a seventh switching unit Q7, a ninth unidirectional conductive unit D9 and a tenth unidirectional conductive unit D10, to obtain the circuit shown in fig. 10.
In the circuit shown in fig. 10, one end of the sixth switching unit Q6 is connected to one end of the seventh switching unit Q7, the other end of the sixth switching unit Q6 is connected to the positive electrode of the third unidirectional conducting unit D3, and the other end of the seventh switching unit Q7 is connected to the connection point between the first capacitor C1 and the second capacitor C2. The ninth unidirectional conduction unit D9 is connected in parallel with the sixth switch unit Q6, and the positive electrode of the ninth unidirectional conduction unit D9 is connected with the positive electrode of the third unidirectional conduction unit D3. The tenth unidirectional conduction unit D10 is connected in parallel with the seventh switching unit Q7, and the negative electrode of the tenth unidirectional conduction unit D10 is connected to the connection point of the first capacitor C1 and the second capacitor C2. That is, the circuit composed of the fifth switching unit Q5, the fifth unidirectional conductive unit D5, the sixth unidirectional conductive unit D6, the seventh unidirectional conductive unit D7, and the eighth unidirectional conductive unit D8 in fig. 10 is equivalent to the switching module SW in fig. 2.
One output end of the control module is connected with the control end of the sixth switch unit Q6, and one output end of the control module is connected with the control end of the seventh switch unit Q7. The connection lines between the sixth switching unit Q6, the seventh switching unit Q7 and the control module are omitted in the circuit shown in fig. 10.
In the circuit shown in fig. 10, when one of the sixth switching unit Q6 and the seventh switching unit Q7 is turned on and the other is turned off, a unidirectional conductive circuit is formed with the ninth unidirectional conductive unit D9 and the tenth unidirectional conductive unit D10. The method comprises the following steps: in the circuit of fig. 10, when the sixth switching unit Q6 is turned on and the seventh switching unit Q7 is turned off, the sixth switching unit Q6 and the tenth unidirectional conduction unit D10 form a unidirectional conduction circuit from left to right; when the sixth switching unit Q6 is turned off and the seventh switching unit Q7 is turned on, the seventh switching unit Q7 and the ninth unidirectional conduction unit D9 form a unidirectional conduction circuit from right to left.
In the embodiment of the invention, when the control module determines that the control rectification module and the switching module work in the high-frequency switching mode, the control module outputs low level to the sixth switching unit Q6 and the seventh switching unit Q7 respectively, so that both the sixth switching unit Q6 and the seventh switching unit Q7 are turned off, and therefore the equivalent switching module SW is turned off to realize the high-frequency switching mode.
In the embodiment of the invention, when the control module determines that the control rectification module and the switching module work in the synchronous rectification mode, the control module can output high level to the sixth switching unit Q6 and the seventh switching unit Q7 respectively, so that the sixth switching unit Q6 and the seventh switching unit Q7 are both conducted, and the equivalent switching module SW is conducted to realize the high-frequency switching mode. The control module may also output a high level to the sixth switching unit Q6 when the voltage output by the AC power supply AC is a positive half cycle, so that the sixth switching unit Q6 is turned on, since the voltage output by the AC power supply AC is a positive half cycle, the voltage applied to the negative electrode of the ninth unidirectional conduction unit D9 is a positive voltage of the AC power supply AC, and the voltage applied to the negative electrode of the tenth unidirectional conduction unit D10 is a voltage of the second capacitor C2, after discharging, the voltage of the second capacitor C2 is lower than the positive voltage of the AC power supply AC, and therefore the sixth switching unit Q6 and the tenth unidirectional conduction unit D10 form a unidirectional conduction circuit from left to right, and the equivalent switching module SW is turned on to implement a high frequency switching mode; the control module may also output a high level to the seventh switching unit Q7 when the voltage output by the AC power source AC is a negative half period, so that the seventh switching unit Q7 is turned on, since the voltage output by the AC power source AC is a negative half period, the voltage applied to the negative electrode of the ninth unidirectional conduction unit D9 is a negative voltage of the AC power source AC, and the voltage applied to the negative electrode of the tenth unidirectional conduction unit D10 is a voltage of the second capacitor C2, and the voltage of the second capacitor C2 is higher than the negative voltage of the AC power source AC, so that the seventh switching unit Q7 and the ninth unidirectional conduction unit D9 form a unidirectional conduction circuit from right to left, and the equivalent switching module SW is turned on to implement the high frequency switching mode.
In an embodiment of the present invention, a switching module may be constructed using two switching units as shown in fig. 11. The switching module SW in the circuit of fig. 2 is replaced with a circuit composed of an eighth switching unit Q8 and a ninth switching unit Q9, resulting in the circuit shown in fig. 11.
In the circuit shown in fig. 11, the eighth switching unit Q8 and the ninth switching unit Q9 are connected in parallel, one end of the circuit obtained by the parallel connection is connected to the positive electrode of the third unidirectional conducting unit D3, and the other end of the circuit obtained by the parallel connection is connected to the connection point of the first capacitor C1 and the second capacitor C2. That is, the circuit composed of the eighth switching unit Q8 and the ninth switching unit Q9 in fig. 11 is equivalent to the switching module SW in fig. 2.
One output end of the control module is connected with the control end of the eighth switching unit Q8, and one output end of the control module is connected with the control end of the ninth switching unit Q9. Connection lines between the eighth switching unit Q8, the ninth switching unit Q9 and the control module are omitted in the circuit shown in fig. 11.
In the circuit shown in fig. 11, the on-off states of the eighth switching unit Q8 and the ninth switching unit Q9 determine the on-off states of the switching module SW, that is, any one of the eighth switching unit Q8 and the ninth switching unit Q9 is turned on to turn on the switching module SW, and the eighth switching unit Q8 and the ninth switching unit Q9 are turned off to turn off the switching module SW.
In the embodiment of the invention, when the control module determines that the control rectification module and the switching module work in the high-frequency switching mode, the control module outputs low level to the eighth switching unit Q8 and the ninth switching unit Q9 respectively so that the eighth switching unit Q8 and the ninth switching unit Q9 are both turned off, and therefore, the equivalent switching module SW is turned off to realize the high-frequency switching mode.
In the embodiment of the invention, when the control module determines that the control rectification module and the switching module work in the synchronous rectification mode, the control module can output high level to the eighth switching unit Q8 and the ninth switching unit Q9 respectively, so that the eighth switching unit Q8 and the ninth switching unit Q9 are both conducted, and therefore the equivalent switching module SW is conducted to realize the synchronous rectification mode. The control module can also output a high level to the eighth switching unit Q8 when the voltage output by the alternating current power supply AC is a positive half period, so that the eighth switching unit Q8 is conducted, and the equivalent switching module SW is conducted to realize a high-frequency switching mode; when the voltage output by the alternating current power supply AC is in a negative half cycle, the control module outputs a high level to the ninth switching unit Q9, so that the ninth switching unit Q9 is conducted, and the equivalent switching module SW is conducted to realize a high-frequency switching mode.
In the embodiment of the invention, a computer program can be written and written into a storage medium inside or outside the control module, and when the computer program is read out by the control module, the control module can output a control signal as shown in fig. 3 so as to control the rectifying module and the switching module to be combined on and off, so that a high-frequency switching mode and a synchronous rectifying mode are realized. The control module in which the above-described computer program is written may be used as the totem pole power factor correction circuit in the embodiment of the invention.
In the embodiment of the present invention, referring to fig. 12, the totem pole power factor correction circuit in the embodiment is sequentially connected with the inverter and the motor, the totem pole power factor correction circuit outputs a driving signal to the inverter, and the inverter drives the motor to operate, and the motor can be used for the compressor. That is, the load to be driven by the totem pole pfc circuit in the embodiment may be specifically an inverter and a motor. The compressor shown in fig. 12 has the advantages of the totem-pole power factor correction circuit in the embodiment, namely, current harmonic wave and power factor are improved, and the compressor can be switched to operate in a synchronous rectification mode or a high-frequency switching mode according to the weight of a motor load, so that the voltage requirements under different loads can be met by selecting boosting and voltage doubling, and the high efficiency advantage of the power factor correction circuit can be maintained.
The compressor shown in fig. 12 may be applied to an air conditioner.
In the embodiment of the present invention, an eleventh unidirectional conduction unit D11 and a twelfth unidirectional conduction unit D12 may be further provided between both ends of the capacitor module and the output end of the rectifier module, referring to fig. 13, based on the circuits shown in fig. 1, fig. 2, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10, fig. 11, or fig. 12. In a specific arrangement, referring to fig. 13, the positive electrode of the eleventh unidirectional conduction unit D11 is connected to the negative electrode of the third unidirectional conduction unit D3, and the negative electrode of the eleventh unidirectional conduction unit D11 is connected to one end of the first capacitor C1; the negative electrode of the twelfth unidirectional conduction unit D12 is connected with the positive electrode of the fourth unidirectional conduction unit D4, and the positive electrode of the twelfth unidirectional conduction unit D12 is connected with one end of the second capacitor C2.
In the embodiment of the present invention, as shown in fig. 13, the eleventh unidirectional conduction unit D11 and the twelfth unidirectional conduction unit D12 are disposed between the two ends of the capacitor module and the output end of the rectifier module, so that current backflow can be prevented when the voltage of the AC power supply AC is lower than the bus voltage of the load, that is, current is prevented from flowing from one end of the first capacitor C1 to the negative electrode of the third unidirectional conduction unit D3, or from the positive electrode of the fourth unidirectional conduction unit D4 to one end of the second capacitor C2, thereby protecting the circuit.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly or indirectly fixed or connected to the other feature. Further, the descriptions of the upper, lower, left, right, etc. used in this disclosure are merely with respect to the mutual positional relationship of the various components of this disclosure in the drawings. As used in this disclosure, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, unless defined otherwise, all technical and scientific terms used in this example have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description of the embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this embodiment includes any combination of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could also be termed a second element, and, similarly, a second element could also be termed a first element, without departing from the scope of the present disclosure. The use of any and all examples, or exemplary language (e.g., "such as") provided herein, is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.
It should be appreciated that embodiments of the invention may be implemented or realized by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer readable storage medium configured with a computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, in accordance with the methods and drawings described in the specific embodiments. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Furthermore, the operations of the processes described in the present embodiments may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes (or variations and/or combinations thereof) described in this embodiment may be performed under control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications), by hardware, or combinations thereof, that collectively execute on one or more processors. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable computing platform, including, but not limited to, a personal computer, mini-computer, mainframe, workstation, network or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and so forth. Aspects of the invention may be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and/or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, which when read by a computer, is operable to configure and operate the computer to perform the processes described herein. Further, the machine readable code, or portions thereof, may be transmitted over a wired or wireless network. When such media includes instructions or programs that, in conjunction with a microprocessor or other data processor, implement the steps described above, the invention described in this embodiment includes these and other different types of non-transitory computer-readable storage media. The invention also includes the computer itself when programmed according to the methods and techniques of the present invention.
The computer program can be applied to the input data to perform the functions described in this embodiment, thereby converting the input data to generate output data that is stored to the non-volatile memory. The output information may also be applied to one or more output devices such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects produced on a display.
The present invention is not limited to the above embodiments, but can be modified, equivalent, improved, etc. by the same means to achieve the technical effects of the present invention, which are included in the spirit and principle of the present invention. Various modifications and variations are possible in the technical solution and/or in the embodiments within the scope of the invention.

Claims (10)

1. A totem pole power factor correction circuit, comprising:
the rectifying module comprises a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, and a first unidirectional conduction unit, a second unidirectional conduction unit, a third unidirectional conduction unit and a fourth unidirectional conduction unit which are connected in a bridge shape; the first unidirectional conduction unit is connected with the first switch unit in parallel, the second unidirectional conduction unit is connected with the second switch unit in parallel, the third unidirectional conduction unit is connected with the third switch unit in parallel, and the fourth unidirectional conduction unit is connected with the fourth switch unit in parallel; the input end of the rectifying module is used for being connected to an alternating current power supply, and the output end of the rectifying module is used for being connected to a load;
The inductance module is arranged between the rectification module and the alternating current power supply;
the capacitor module comprises a first capacitor and a second capacitor which are connected in series; the capacitor module is connected with the output end of the rectifying module in parallel;
the switch module is connected with one input end of the rectifying module, and the other end of the switch module is connected with a connecting point of the first capacitor and the second capacitor;
the control module is used for controlling the rectifying module and the switching module to work in a high-frequency switching mode or a synchronous rectifying mode according to the working parameters of the load;
the control module comprises a parameter detection unit and a main control unit;
the parameter detection unit is used for detecting working parameters of the load;
the main control unit is connected with the parameter detection unit and is used for determining whether to work in the high-frequency switch mode or the synchronous rectification mode according to the working parameter of the load and controlling the rectification module and the switch module to realize the high-frequency switch mode or the synchronous rectification mode according to the voltage waveform of the alternating current power supply and the current in the rectification module;
the determining, according to the working parameter of the load, whether to work in the high-frequency switch mode or the synchronous rectification mode specifically includes:
When the working parameter of the load is in a first working parameter interval, determining to work in the high-frequency switch mode;
when the working parameters of the load are in a second working parameter interval, determining to work in the synchronous rectification mode; the lower limit value in the second working parameter interval is larger than the upper limit value of the first working parameter interval;
in the synchronous rectification mode:
the switch module is conducted;
when the first unidirectional conduction unit has current flowing through, the first switch unit is turned on, otherwise, the first switch unit is turned off;
when the second unidirectional conduction unit has current flowing through, the second switch unit is turned on, otherwise, the second switch unit is turned off;
the third switching unit and the fourth switching unit are turned off;
in the high frequency switching mode:
the switch module is turned off;
the first switch unit and the second switch unit are alternately switched on and off in the full period of the voltage waveform of the alternating current power supply;
in the positive half period of the voltage waveform of the alternating current power supply, the third switching unit is turned off, and the fourth switching unit is turned on;
in the negative half period of the voltage waveform of the alternating current power supply, the third switching unit is turned on, and the fourth switching unit is turned off;
The first switch unit and the second switch unit are alternately switched on and off, and specifically comprise:
the first switch unit is controlled by a PWM signal to be switched on and switched off;
the second switch unit is controlled to be switched on and switched off by the reverse phase signal of the PWM signal;
the duty cycle of the PWM signal is determined by the voltage waveform of the ac power source, the bus voltage of the load, and the operating parameters of the load.
2. The totem pole power factor correction circuit of claim 1, wherein an anode of the first unidirectional conducting unit is connected with a cathode of the second unidirectional conducting unit, a cathode of the third unidirectional conducting unit is connected with a cathode of the fourth unidirectional conducting unit, a cathode of the first unidirectional conducting unit is connected with a cathode of the third unidirectional conducting unit, an anode of the second unidirectional conducting unit is connected with an anode of the fourth unidirectional conducting unit, an anode of the first unidirectional conducting unit and an anode of the second unidirectional conducting unit are output ends of the rectifying module, and an anode of the first unidirectional conducting unit and an anode of the third unidirectional conducting unit are input ends of the rectifying module.
3. The totem pole power factor correction circuit of claim 2, wherein the control module further comprises:
an alternating voltage detection unit for detecting a voltage waveform of the alternating current power supply;
the direct-current voltage detection unit is used for detecting the bus voltage of the load;
and the current detection unit is used for detecting the current in the rectifying module.
4. The totem pole power factor correction circuit of claim 2, wherein the switching module comprises a fifth switching cell, a fifth unidirectional conduction cell, a sixth unidirectional conduction cell, a seventh unidirectional conduction cell, and an eighth unidirectional conduction cell;
the positive electrode of the fifth unidirectional conduction unit and the negative electrode of the sixth unidirectional conduction unit are connected in series to form a first branch;
the positive electrode of the seventh unidirectional conduction unit and the negative electrode of the eighth unidirectional conduction unit are connected in series to form a second branch;
the first branch, the second branch and the fifth switching unit are connected in parallel;
the positive electrode of the fifth unidirectional conduction unit is connected with the positive electrode of the third unidirectional conduction unit;
the positive electrode of the seventh unidirectional conduction unit is connected with the connection point of the first capacitor and the second capacitor;
When the rectifying module and the switching module work in a high-frequency switching mode, the fifth switching unit is turned off;
when the rectifying module and the switching module work in a synchronous rectifying mode, the fifth switching unit is conducted.
5. The totem pole power factor correction circuit of claim 1, wherein the operating parameter is load power, load current, or load frequency.
6. The totem pole power factor correction circuit of any of claims 1-5, further comprising an eleventh unidirectional conduction unit and a twelfth unidirectional conduction unit; the eleventh unidirectional conduction unit is connected between one end of the capacitor module and one output end of the rectifying module, and the twelfth unidirectional conduction unit is connected between the other end of the capacitor module and the other output end of the rectifying module.
7. A control method for controlling the totem pole power factor correction circuit of claim 2, comprising:
acquiring working parameters of the load, and controlling the rectifying module and the switching module to work in a high-frequency switching mode or a synchronous rectifying mode according to the working parameters;
In the synchronous rectification mode:
the switch module is conducted;
when the first unidirectional conduction unit has current flowing through, the first switch unit is turned on, otherwise, the first switch unit is turned off;
when the second unidirectional conduction unit has current flowing through, the second switch unit is turned on, otherwise, the second switch unit is turned off;
the third switching unit and the fourth switching unit are turned off;
in the high frequency switching mode:
the switch module is turned off;
the first switch unit and the second switch unit are alternately switched on and off in the full period of the voltage waveform of the alternating current power supply;
in the positive half period of the voltage waveform of the alternating current power supply, the third switching unit is turned off, and the fourth switching unit is turned on;
in the negative half period of the voltage waveform of the alternating current power supply, the third switching unit is turned on, and the fourth switching unit is turned off.
8. A storage medium having stored therein processor-executable instructions which, when executed by a processor, are for performing the method of claim 7.
9. A compressor, comprising:
A totem pole power factor correction circuit as recited in any of claims 1-6;
the input end of the inverter is connected with the output end of the rectifying module in the totem pole power factor correction circuit;
and the motor is connected with the output end of the inverter.
10. An air conditioner comprising the compressor according to claim 9.
CN202010710984.8A 2020-07-22 2020-07-22 Power factor correction circuit, control method thereof, medium, compressor and air conditioner Active CN113972822B (en)

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Publication number Priority date Publication date Assignee Title
JP2011078179A (en) * 2009-09-29 2011-04-14 Sanken Electric Co Ltd Resonant converter device
CN207010546U (en) * 2017-06-30 2018-02-13 广东美的制冷设备有限公司 PFC circuit and transducer air conditioning
CN209860795U (en) * 2019-05-17 2019-12-27 广东美的制冷设备有限公司 Power factor correction circuit and air conditioner
CN110880863A (en) * 2019-11-29 2020-03-13 广东美的制冷设备有限公司 Control method, control device, household appliance and computer readable storage medium
CN111355416A (en) * 2020-04-16 2020-06-30 广东美的制冷设备有限公司 Motor drive control circuit, motor drive method, circuit board and air conditioner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011078179A (en) * 2009-09-29 2011-04-14 Sanken Electric Co Ltd Resonant converter device
CN207010546U (en) * 2017-06-30 2018-02-13 广东美的制冷设备有限公司 PFC circuit and transducer air conditioning
CN209860795U (en) * 2019-05-17 2019-12-27 广东美的制冷设备有限公司 Power factor correction circuit and air conditioner
CN110880863A (en) * 2019-11-29 2020-03-13 广东美的制冷设备有限公司 Control method, control device, household appliance and computer readable storage medium
CN111355416A (en) * 2020-04-16 2020-06-30 广东美的制冷设备有限公司 Motor drive control circuit, motor drive method, circuit board and air conditioner

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