CN113972822A - Power factor correction circuit and control method thereof, medium, compressor and air conditioner - Google Patents

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

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Publication number
CN113972822A
CN113972822A CN202010710984.8A CN202010710984A CN113972822A CN 113972822 A CN113972822 A CN 113972822A CN 202010710984 A CN202010710984 A CN 202010710984A CN 113972822 A CN113972822 A CN 113972822A
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China
Prior art keywords
unit
module
switch
switching
turned
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CN202010710984.8A
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Chinese (zh)
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CN113972822B (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
Publication of CN113972822A publication Critical patent/CN113972822A/en
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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
    • H02M1/4233—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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

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 rectifying module, an inductance module, a capacitance module, a switch module and a control module, wherein the control module is used for controlling the rectifying module and the switch module to work in a high-frequency switching mode or a synchronous rectifying mode according to the working parameters of the load. When the circuit works in a high-frequency switch mode, the totem-pole power factor correction circuit can control the waveform of input current to change along with the input voltage, so that the input current harmonic and the power factor are improved, the bus voltage is raised, and the boost output is realized; when the circuit works in a synchronous rectification mode, voltage-multiplying output can be realized, so that the totem-pole power factor correction circuit can realize the functions of boosting and voltage-multiplying, adapt to the voltage requirements of different working parameters of a load and keep the high efficiency advantage of the power factor correction circuit. The invention is widely applied to the technical field of electronic power.

Description

Power factor correction circuit and 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, a medium, a compressor and an air conditioner thereof.
Background
In the existing electronic Power technology, in order to obtain a high Power Factor, a PFC (Power Factor Correction) circuit is commonly used to provide a bus voltage. Some existing power factor correction circuits have a boosting function, that is, the output voltage of the power factor correction circuit is higher than the input voltage, but when the voltage-doubling output is required, that is, the output voltage is twice of the input voltage, the existing power factor correction 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 for boosting and voltage-doubling, a power factor correction circuit and a special voltage-doubling circuit are required. The high complexity of the circuit will result in high use costs and high failure rates.
Disclosure of Invention
In view of at least one of the above technical problems, an object of the present invention is to provide a totem-pole power factor correction circuit, a control method thereof, a medium, a compressor and an air conditioner, which have boosting and voltage doubling functions to meet voltage requirements under different operating parameters.
The totem-pole power factor correction circuit according to the embodiment of the first aspect of the invention comprises:
the rectifier module comprises a plurality of unidirectional conduction units which are connected into a bridge shape, and each unidirectional conduction unit is respectively connected with a 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 rectifier module in parallel;
one end of 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 connection point of the first capacitor and the second capacitor;
and 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 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: through the control of the control module, the rectification module and the switch module can switch between a high-frequency switch mode and a synchronous rectification mode to work, and when the circuit works in the high-frequency switch mode, the totem-pole power factor correction circuit can control the input current waveform to change along with the input voltage, so that the input current harmonic and the power factor are improved, the bus voltage is raised, and the boost output is realized; when the circuit works in a synchronous rectification mode, the totem-pole power factor correction circuit can realize voltage-multiplying output, so that the totem-pole power factor correction circuit can realize the functions of boosting and voltage-multiplying, is suitable for voltage requirements of different working parameters of a load, and can keep the high efficiency advantage of the power factor correction circuit.
According to some embodiments of the present invention, the rectification module includes a first unidirectional conduction unit, a second unidirectional conduction unit, a third unidirectional conduction unit, a fourth unidirectional conduction unit, a first switch unit, a second switch unit, a third switch unit, and a fourth switch 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 one-way conduction unit is connected with the negative pole of the second one-way conduction unit, the positive pole of the third one-way conduction unit is connected with the negative pole of the fourth one-way conduction unit, the negative pole of the first one-way conduction unit is connected with the negative pole of the third one-way conduction unit, the positive pole of the second one-way conduction unit is connected with the positive pole of the fourth one-way conduction unit, the negative pole of the first one-way conduction unit and the positive pole of the second one-way conduction unit are output ends of the rectification module, the positive pole of the first one-way conduction unit and the positive pole of the third one-way conduction unit are input ends of the rectification module.
Each switch unit in the rectification module of the embodiment of the invention can receive the control signal output by the control module to realize rectification of the input current of the alternating current power supply so as to improve the input current harmonic wave and the power factor.
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;
the current detection unit is used for detecting the current in the rectification module;
the parameter detection unit is used for detecting the working parameters of the load;
and 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 to realize the high-frequency switching 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 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 to realize the high-frequency switching mode or the synchronous rectifying mode.
According to some embodiments of the present invention, the determining to operate in the high-frequency switching mode or the synchronous rectification mode according to the operating parameter of the load specifically includes:
when the working parameter of the load is in a first working parameter interval, determining to work in the high-frequency switching mode;
when the working parameter of the load is in a second working parameter interval, determining to work in the synchronous rectification mode; and the lower limit value in the second working parameter interval is greater than the upper limit value in 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 switching 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 conducted, otherwise, the first switch unit is turned off;
when the second unidirectional conducting unit has current flowing through, the second switch unit is conducted, 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-multiplying output.
According to some embodiments of the invention, 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 a positive half period of a voltage waveform of the alternating current power supply, the third switching unit is turned off, and the fourth switching unit is turned on;
in a negative half cycle of a voltage waveform of the ac power source, the third switching unit is turned on and the fourth switching unit is turned off.
According to some embodiments of the present invention, the alternately turning on and off of the first switch unit and the second switch unit specifically includes:
the first switch unit is switched on and off under the control of a PWM signal;
the second switch unit is switched on and off under the control of the inverted 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 present invention, the switch module includes a fifth switch unit, a fifth unidirectional conducting unit, a sixth unidirectional conducting unit, a seventh unidirectional conducting unit, and an eighth unidirectional conducting unit;
the anode of the fifth one-way conduction unit and the cathode of the sixth one-way conduction unit are connected in series to form a first branch circuit;
the anode of the seventh unidirectional conduction unit and the cathode of the eighth unidirectional conduction unit are connected in series to form a second branch circuit;
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 conducting 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;
and 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 parameters according to the characteristics of the load so as to determine the high-frequency switching mode or the synchronous rectification mode, thereby better meeting the voltage requirement of the load.
According to some embodiments of the present invention, the totem-pole power factor correction circuit further comprises an eleventh unidirectional conducting unit and a twelfth unidirectional conducting unit; the eleventh unidirectional conduction unit is connected between one end of the capacitor module and one output end of the rectifier module, and the twelfth unidirectional conduction unit is connected between the other end of the capacitor module and the other output end of the rectifier 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 rectification module, so that the current backflow can be prevented when the voltage of the alternating current power supply AC is lower than the bus voltage of the load, and the safety of the circuit is protected.
According to the control method of the second aspect of the invention, the totem-pole power factor correction circuit for controlling the first aspect of the invention comprises:
acquiring working parameters of the load, and controlling the rectification module and the switch module to work in a high-frequency switch mode or a synchronous rectification 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 conducted, otherwise, the first switch unit is turned off;
when the second unidirectional conducting unit has current flowing through, the second switch unit is conducted, 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 a positive half period of a voltage waveform of the alternating current power supply, the third switching unit is turned off, and the fourth switching unit is turned on;
in a negative half cycle of a voltage waveform of the ac power source, the third switching unit is turned on and the fourth switching unit is turned off.
According to the control method of the embodiment of the second aspect of the invention, at least the following beneficial effects are achieved: through the control of the control module, the rectification module and the switch module can switch between a high-frequency switch mode and a synchronous rectification mode to work, and when the circuit works in the high-frequency switch mode, the totem-pole power factor correction circuit can control the input current waveform to change along with the input voltage, so that the input current harmonic and the power factor are improved, the bus voltage is raised, and the boost output is realized; when the circuit works in a synchronous rectification mode, the totem-pole power factor correction circuit can realize voltage-multiplying output, so that the totem-pole power factor correction circuit can realize the functions of boosting and voltage-multiplying, is suitable for voltage requirements of different working parameters of a load, 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 configured to perform 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 advantages: the control method can be executed in a computer automation mode, and the operation efficiency is improved.
A compressor according to an embodiment of a fourth aspect of the present invention includes:
the totem-pole power factor correction circuit according to the 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 the fifth aspect of the present invention includes the compressor according to the embodiment of the fourth aspect of the present invention.
According to the compressor of the fourth aspect embodiment and the air conditioner of the fifth aspect embodiment of the invention, at least the following advantages are achieved: 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 switching mode according to the weight of the motor load, so that the voltage requirements under different loads can be met by selecting 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 power factor correction circuit according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of a control signal output by the 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 according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an equivalent structure of the circuit of FIG. 5 according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an equivalent structure of the circuit of FIG. 5 according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of an equivalent structure of the circuit of FIG. 2 according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a switch module according to an embodiment of the invention;
fig. 10 is a schematic structural diagram of a switch module according to an embodiment of the invention;
fig. 11 is a schematic structural diagram of a switch module according to an embodiment of the invention;
FIG. 12 is a circuit diagram of a compressor in an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a totem-pole power factor correction circuit provided with an eleventh unidirectional conducting unit and a twelfth unidirectional conducting unit in the 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 rectification module, an inductance module, a capacitance module, a switching module, and a control module.
In the embodiment of the invention, the rectifying module comprises a plurality of unidirectional conducting units and a plurality of switch units, the unidirectional conducting units are connected into a bridge shape, and each unidirectional conducting unit is respectively connected with one switch unit in parallel. In the embodiment of the invention, a diode can be used as a unidirectional conducting unit, and other devices with unidirectional conducting capability can also be used as the unidirectional conducting unit; devices with controlled switching capability, such as a triode, a field effect transistor or an insulated gate bipolar transistor, can be used as the switching unit.
In an embodiment of the invention, the rectifier module includes a first unidirectional conducting unit D1, a second unidirectional conducting unit D2, a third unidirectional conducting unit D3, a fourth unidirectional conducting 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 conductive units are connected in a bridge shape, that is, the anode of the first unidirectional conductive unit D1 is connected with the cathode of the second unidirectional conductive unit D2, the anode of the third unidirectional conductive unit D3 is connected with the cathode of the fourth unidirectional conductive unit D4, the cathode of the first unidirectional conductive unit D1 is connected with the cathode of the third unidirectional conductive unit D3, and the anode of the second unidirectional conductive unit D2 is connected with the anode of the fourth unidirectional conductive unit D4. Each unidirectional conducting unit is respectively connected with one switch unit in parallel, namely a first unidirectional conducting unit D1 is connected with a first switch unit Q1 in parallel, a second unidirectional conducting unit D2 is connected with a second switch unit Q2 in parallel, a third unidirectional conducting unit D3 is connected with a third switch unit Q3 in parallel, and a fourth unidirectional conducting unit D4 is connected with a fourth switch unit Q4 in parallel.
In the embodiment of the present invention, in the rectifier module composed of the first unidirectional conducting unit D1 and the first switching unit Q1, the cathode of the first unidirectional conducting unit D1 and the anode of the second unidirectional conducting unit D2 are output terminals of the rectifier module, and the anode of the first unidirectional conducting unit D2 and the anode of the third unidirectional conducting unit D3 are input terminals of the rectifier module.
Referring to fig. 1, an input terminal of the rectifying module is connected to an alternating current power 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 capacitor module in parallel. In an embodiment of the invention, the capacitor module comprises a first capacitor C1 and a second capacitor C2 which are connected together in series. The switch module SW is connected across one input end of the rectifier module and the capacitor module, specifically, one end of the switch module SW is connected to the positive electrode of the third unidirectional conducting unit D3 in the rectifier module, and the other end of the switch module SW is connected to 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 of the anode of the third unidirectional conducting 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 of the anode of the third unidirectional conducting 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 operating parameter of a load, detecting a voltage waveform of an ac power supply, and detecting a current input from the ac power supply to the rectification module; the control module has a control function, and can select to operate in a high-frequency switching mode or a synchronous rectification mode according to the detected operating parameters of the load, wherein the high-frequency switching mode or the synchronous rectification mode is realized by the on-off state combination 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 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 on-off state combination 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 operate 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. Wherein the alternating voltage detection unit may 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 detecting unit may be a current sensor for detecting a current flowing through the rectifying 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 also be a frequency sensor, and the sensors may respectively detect the power, the current, the pressure or the frequency of the load, that is, the operating parameter detected by the parameter detecting unit includes one of the power, the current or the frequency.
The main control unit can be a single chip microcomputer, and is connected with the alternating voltage detection unit, the direct voltage detection unit, the current detection unit and the parameter detection unit, so that the voltage waveform of the alternating current power supply, the load bus voltage, 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 further connected to the control terminal of the first switch unit Q1, the control terminal of the second switch unit Q2, the control terminal of the third switch unit Q3, the control terminal of the fourth switch unit Q4, and the control terminal of the switch module SW through IO interfaces, respectively, in fig. 1, the connections between the main control unit and the control terminal of the first switch unit Q1 are not specifically shown, but arrows indicate that the main control unit outputs control signals to them.
The main control unit determines whether the rectifier module and the switch module are required to be controlled to work in a high-frequency switch mode or a synchronous rectifier mode according to working parameters of a load by calling a control program operated by the main control unit, and then outputs corresponding waveforms through an execution program to drive the first switch unit Q1, the second switch unit Q2, the third switch unit Q3, the fourth switch unit Q4 and the switch module SW to carry out on-off state conversion, so that different on-off state combinations are formed, and the rectifier module and the switch module work in the high-frequency switch mode or the synchronous rectifier mode.
Referring to fig. 1, the internal resistances of the ac voltage detecting unit and the dc voltage detecting unit are large, that is, they are connected in parallel to the circuit and can be regarded as open circuit, the internal resistance of the current detecting unit is small, and it is connected in series to the circuit and can be regarded as short circuit, and the main control unit in fig. 1 mainly plays a role in expressing the control signal output by the main control unit to the first switching unit Q1, etc., so 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 by the control module not shown, and perform switching of on-off states, so as to form different combinations of on-off states, thereby 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 rectification module and the switch module to work in a high-frequency switch mode or a synchronous rectification mode according to the working parameters of the load. Specifically, the control module sets successively larger operating parameter thresholds P1、P2、P3And P4I.e. P1＜P2＜P3＜P4Forming a first operating parameter interval [ P ]1,P2]And a second operating parameter interval [ P3,P4]. If the working parameter of the load is in the first working parameter interval [ P1,P2]If the working parameter of the load is in the second working parameter interval [ P ]3,P4]And the control module determines that the control rectification module and the switch module work in the synchronous rectification mode.
The left half of fig. 3 illustrates control signal waveforms output by the control module to the switching units and the switching modules in the rectification module when the control module determines that the rectification module and the switching modules operate in the high-frequency switching mode, and the right half of fig. 3 illustrates control signal waveforms output by the control module to the switching units and the switching modules in the rectification module when the control module determines that the rectification module and the switching modules operate in the synchronous rectification mode.
Q1 in fig. 3 indicates a control signal waveform output to the first switching unit Q1, Q2 indicates a control signal waveform output to the second switching unit Q2, Q3 indicates a control signal waveform output to the third switching unit Q3, Q4 indicates a control signal waveform output to the fourth switching unit Q4, and SW indicates a control signal waveform output to the switching module SW. In the embodiment of the invention, the switch module or one switch unit can be changed into the conducting state when receiving the high level output by the control module, and the switch module or one switch unit can be changed into the switching-off state when receiving the low level output by the control module.
Us in fig. 3 represents a voltage waveform across the AC power source AC, and Is represents a voltage waveform of the AC power source AC input to the rectifier module.
When the control module is to control the rectifying module and the switch module to operate in the high-frequency switching mode, referring to the left half part of fig. 3, the control module outputs a low level to the switch module SW, so that the switch module SW is turned off; when the control module detects that the voltage waveform of the ac power is in a 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 is in a positive half cycle, the circuit topology shown in fig. 2 takes the form of fig. 4. When the control module detects that the voltage waveform of the ac power is in a 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 is in a negative half cycle, the circuit topology shown in fig. 2 takes the form of fig. 5.
The control module collects the voltage waveform output by the AC power supply, determines the duty ratio of the PWM waveform according to the voltage waveform of the AC power supply in a mode of sampling and comparing by an internal analog circuit or a mode of executing an algorithm by a digital circuit, for example, a real-time calculation method, a regular sampling method or an irregular sampling method, and the like, and acquires the PWM waveform equivalent to the voltage waveform of the AC power supply. In an embodiment of the present invention, the voltage waveform of the AC power supply AC may be a sine wave, that is, the PWM waveform acquired 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 and second switching units Q1 and Q2.
In an embodiment of the present invention, the PWM waveform output by the control module to the first switching unit Q1 and the PWM waveform output to the second switching unit Q2 are in opposite phases. Referring to fig. 3, the duty ratio of the PWM waveform output by the control module to the first switching unit Q1 is the smallest at the voltage zero crossing and the largest at the voltage peak/valley, and the duty ratio of the PWM waveform output by the control module to the second switching unit Q2 is the largest at the voltage zero crossing and the smallest at the voltage peak/valley.
In an 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 30 Khz.
Under the driving of the PWM waveform, the first switching unit Q1 and the second switching unit Q2 are alternately turned on and off at a high frequency throughout the entire period of the voltage waveform of the ac power source. Referring to fig. 3, a PWM waveform driving the first switching unit Q1 is opposite in phase to a PWM waveform driving the second switching unit Q2, and thus 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 in the alternate on and off of the first switching unit Q1 and the alternate on and off of the second switching unit Q2. Taking the circuit shown in fig. 5 as an example, at this time, the voltage output by the AC power supply AC is a negative half cycle, in this embodiment, the voltage of the negative electrode of the fourth unidirectional conducting unit D4 is higher than the voltage of the positive electrode of the first unidirectional conducting unit D1, when the first switching unit Q1 is turned on and the second switching unit Q2 is turned off, the topology of the circuit shown in fig. 5 is equivalent to that shown in fig. 6, at this time, two ends of the inductor module L are connected to the AC power supply AC, the AC power supply AC charges the inductor module L, and the capacitor module supplies power to the load; when the first switch unit Q1 is turned off and the second switch unit Q2 is turned on, the topology of the circuit shown in fig. 5 is equivalent to that shown in fig. 7, and at this time, the inductor module L, the first capacitor C1 and the second capacitor C2 are connected in series, the inductor module L discharges to charge the first capacitor C1 and the second capacitor C2, and the inductor module L also discharges to supply power to the load. In both topologies of fig. 6 and 7, a voltage higher than the output voltage of the AC power source AC can be obtained across the capacitor module, so that a boosting effect Is achieved, and since the control waveform output by 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 source AC, referring to fig. 3, the waveform of the current Is input into the rectifier module by the AC power source AC Is also a sine wave, so that the input current harmonics and the power factor are improved.
The circuit equivalent topologies shown in fig. 6 and 7 are based on the analysis of fig. 5, i.e., the case where the output voltage of the alternating-current power supply AC is in the negative half cycle. Due to the symmetry of the circuit, when the output voltage of the AC power supply AC Is in the positive half cycle, i.e., the circuit shown in fig. 4, the same conclusion can be obtained through analysis, 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 achieve the boosting effect, and the waveform of the current Is input into the rectifier module by the AC power supply AC Is also a sine wave, so as to improve the input current harmonic and the power factor.
When the control module is to control the rectifying module and the switching module to operate in the synchronous rectifying mode, referring to the right half 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 switch module SW, and the control module outputs a low level to the third switch unit Q3 and the fourth switch unit Q4, so that the third switch unit Q3 and the fourth switch 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 may be independently controlled by the control module, so as to perform synchronous rectification.
As can be seen from the circuit configuration shown in fig. 8, as the positive and negative half cycles of the AC power supply AC are switched, the current flowing through the rectifier module either flows through the first unidirectional conducting unit D1 or the second unidirectional conducting unit D2, and the control module can determine whether the current flows through the first unidirectional conducting unit D1 or the second unidirectional conducting unit D2 according to the current flowing direction.
When the control module detects that the current flows through the first unidirectional conducting unit D1, the control module outputs a high level to the first switching unit Q1, so that the first switching unit Q1 is turned on, and if the control module does not detect that the current flows through the first unidirectional conducting unit D1, 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 current flows through the second unidirectional conducting unit D2, the control module outputs a high level to the second switching unit Q2, so that the second switching unit Q2 is turned on, and if the control module does not detect that the current flows through the second unidirectional conducting unit D2, 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, which means that the AC power AC is connected to the two ends of the first capacitor C1 through the inductor module L, to charge the first capacitor C1; when the first switch unit Q1 is turned off and the second switch unit Q2 is turned on, it is equivalent to the AC power source AC being connected to the two ends of the second capacitor C2 through the inductor module L to charge the second capacitor C2. The two ends of the first capacitor C1 and the two ends of the second capacitor C2 can respectively obtain the voltage of the alternating current capacitor AC, and the two ends of the capacitor module formed by connecting the first capacitor C1 and the second capacitor C2 in series can obtain the voltage equivalent to twice the output voltage of the alternating current capacitor AC, so that the voltage doubling effect is realized.
By combining the advantages of the control module determining the high-frequency switch mode or the synchronous rectification mode and the high-frequency switch mode and the synchronous rectification mode according to the working parameters, the method can summarizeThe totem-pole power factor correction circuit in the embodiment of the invention has the following beneficial effects: when the working parameters of the load such as power, current, pressure or frequency are in a smaller first working parameter interval [ P1,P2]The totem-pole power factor correction circuit can control the input current waveform to change along with the input voltage under the control of the control module, thereby improving the input current harmonic wave and the power factor, raising the bus voltage and realizing boost output; when the working parameters of the load such as power, current, pressure or frequency are in a larger second working parameter interval [ P3,P4]And the totem-pole power factor correction circuit can realize voltage-doubling output and has stronger load 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 a load, and can keep the high efficiency advantage of the power factor correction circuit.
In the embodiment of the present 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 may be used to construct the switch module in the embodiment of the present invention.
In an embodiment of the present invention, one switching unit may be used to construct a switching module as shown in fig. 9. The switch module SW in the circuit of fig. 2 is replaced by a circuit consisting of a fifth switch unit Q5, a fifth unidirectional conducting unit D5, a sixth unidirectional conducting unit D6, a seventh unidirectional conducting unit D7 and an eighth unidirectional conducting 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 to the positive electrode of the third unidirectional conducting unit D3, and the positive electrode of the seventh unidirectional conducting unit D7 is connected to the connection point of the first capacitor C1 and the second capacitor C2, that is, a 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 can rectify the current flowing through the fifth switching unit Q5.
An output of the control module is connected to a control terminal of a fifth switching unit Q5. The connection line between the fifth switching unit Q5 and the control module is omitted from the circuit shown in fig. 9.
In the circuit shown in fig. 9, the on-off state of the fifth switch unit Q5 determines the on-off state of the switch module SW, i.e. the fifth switch unit Q5 is turned on to turn on the switch module SW, and the fifth switch unit Q5 is turned off to turn off the switch module SW.
In the embodiment of the present invention, when the control module determines that the control rectification module and the switch module operate in the high-frequency switching mode, the control module outputs a low level to the fifth switching unit Q5 to turn off the fifth switching unit, so that the equivalent switch module SW is turned off to implement the high-frequency switching mode. When the control module determines that the control rectification module and the switch module operate in the synchronous rectification mode, the control module outputs a high level to the fifth switching unit Q5 to turn on the fifth switching unit, so that the equivalent switch module SW is turned on to implement the synchronous rectification mode.
In an embodiment of the present invention, a switch module may be constructed using two switch units as shown in fig. 10. The switch module SW in the circuit of fig. 2 is replaced by a circuit consisting of a sixth switch unit Q6, a seventh switch unit Q7, a ninth unidirectional conducting unit D9 and a tenth unidirectional conducting unit D10, resulting in the circuit shown in fig. 10.
In the circuit shown in fig. 10, one end of a sixth switching unit Q6 is connected to one end of a seventh switching unit Q7, the other end of the sixth switching unit Q6 is connected to the positive electrode of the third unidirectional conductive unit D3, and the other end of the seventh switching unit Q7 is connected to the connection point of the first capacitor C1 and the second capacitor C2. The ninth unidirectional conducting unit D9 is connected in parallel with the sixth switching unit Q6, and the anode of the ninth unidirectional conducting unit D9 is connected to the anode of the third unidirectional conducting unit D3. The tenth unidirectional conducting unit D10 is connected in parallel with the seventh switching unit Q7, and the cathode of the tenth unidirectional conducting unit D10 is connected to the connection point of the first capacitor C1 and the second capacitor C2. That is, a circuit composed of 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. 10 is equivalent to the switching module SW in fig. 2.
An output terminal of the control module is connected to the control terminal of the sixth switching unit Q6, and an output terminal is connected to the control terminal of the seventh switching unit Q7. The connection lines between the sixth switching unit Q6, the seventh switching unit Q7 and the control module are omitted from 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 circuit which is unidirectionally turned on is formed with the ninth unidirectionally-turned-on unit D9 and the tenth unidirectionally-turned-on unit D10. The method specifically 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 turn-on unit D10 form a left-to-right unidirectional turn-on circuit; 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 conducting unit D9 form a unidirectional conducting circuit from right to left.
In the embodiment of the present invention, when the control module determines that the control rectification module and the switching module operate in the high frequency switching mode, the control module outputs a low 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 turned off, and thus the equivalent switching module SW is turned off to implement the high frequency switching mode.
In an embodiment of the present invention, when the control module determines that the control rectification module and the switching module operate in the synchronous rectification mode, the control module may output a 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 turned on, and thus the equivalent switching module SW is turned on to implement 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, and 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 conducting unit D9 is a positive voltage of the AC power supply AC, and the voltage applied to the negative electrode of the tenth unidirectional conducting unit D10 is a voltage of the second capacitor C2, and after discharging, the voltage of the second capacitor C2 is lower than the positive voltage of the AC power supply AC, so that the sixth switching unit Q6 and the tenth unidirectional conducting unit D10 form a single-direction conducting 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 cycle, so that the seventh switching unit Q7 is turned on, and since the voltage output by the AC power source AC is a negative half cycle, the voltage applied to the negative electrode of the ninth unidirectional conducting unit D9 is a negative voltage of the AC power source AC, and the voltage applied to the negative electrode of the tenth unidirectional conducting 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 conducting unit D9 form a unidirectional conducting 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 switch module may be constructed using two switch units as shown in fig. 11. The switching module SW in the circuit of fig. 2 is replaced by a circuit consisting of the eighth switching unit Q8 and the 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 parallel circuit is connected to the anode of the third unidirectional conductive unit D3, and the other end of the parallel circuit 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.
An output terminal of the control module is connected to the control terminal of the eighth switching unit Q8, and an output terminal is connected to the control terminal of the ninth switching unit Q9. The connection lines between the eighth switching unit Q8, the ninth switching unit Q9 and the control module are omitted from 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 state of the switching module SW, that is, either the eighth switching unit Q8 or the ninth switching unit Q9 is turned on to turn on the switching module SW, and both 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 present invention, when the control module determines that the control rectification module and the switching module operate in the high frequency switching mode, the control module outputs a 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 thus the equivalent switching module SW is turned off to implement the high frequency switching mode.
In an embodiment of the present invention, when the control module determines that the control rectification module and the switching module operate in the synchronous rectification mode, the control module may output a 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 turned on, and thus the equivalent switching module SW is turned on to implement the synchronous rectification mode. The control module may also output a high level to the eighth switching unit Q8 when the voltage output by the AC power supply AC is a positive half cycle, so that the eighth switching unit Q8 is turned on, and the equivalent switching module SW is turned on to implement a high frequency switching mode; when the voltage output by the AC power source AC is 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 turned on and the equivalent switching module SW is turned on to implement a high frequency switching mode.
In the embodiment of the present invention, a computer program may be written and written in a storage medium inside or outside the control module, and when the computer program is read out by the control module, the control module may output a control signal as shown in fig. 3 to control the switching module and the rectifying module to perform on-off combination, so as to implement the high-frequency switching mode and the synchronous rectifying mode. The control module into which the above-described computer program is written may be used as a totem-pole power factor correction circuit in the embodiment of the present invention.
In the embodiment of the 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, the inverter drives the motor to work, and the motor can be used for a compressor. That is, the load to be driven by the totem-pole power factor correction circuit in the embodiment can be definitely 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 that the current harmonics and the power factor are improved, and can be switched to work in a synchronous rectification mode or a high-frequency switching mode according to the weight of the motor load, so that the voltage requirements under different loads can be adapted by selecting the 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, referring to fig. 13, on the basis of the circuits of fig. 1, fig. 2, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10, fig. 11, fig. 12, and the like, an eleventh unidirectional conducting unit D11 and a twelfth unidirectional conducting unit D12 may be disposed between the two ends of the capacitor module and the output end of the rectifier module. In a specific arrangement, referring to fig. 13, the anode of the eleventh unidirectional conducting unit D11 is connected to the cathode of the third unidirectional conducting unit D3, and the cathode of the eleventh unidirectional conducting unit D11 is connected to one end of the first capacitor C1; the cathode of the twelfth unidirectional conducting unit D12 is connected to the anode of the fourth unidirectional conducting unit D4, and the anode of the twelfth unidirectional conducting unit D12 is connected to one end of the second capacitor C2.
In the embodiment of the present invention, as shown in fig. 13, the eleventh unidirectional conducting unit D11 and the twelfth unidirectional conducting unit D12 are disposed between the two ends of the capacitor module and the output end of the rectifier module, so that it is possible to prevent the current from flowing backward when the voltage of the AC power source AC is lower than the bus voltage of the load, that is, prevent the current from flowing from one end of the first capacitor C1 to the negative electrode of the third unidirectional conducting unit D3, or from the positive electrode of the fourth unidirectional conducting unit D4 to one end of the second capacitor C2, thereby protecting the circuit from safety.
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 fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the descriptions of upper, lower, left, right, etc. used in the present disclosure are only relative to the mutual positional relationship of the constituent parts of the present 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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this embodiment, the term "and/or" includes any combination of one or more of the associated listed items.
It will be understood that, although the terms first, second, third, etc. may be used herein 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 be termed a second element, and, similarly, a second element could 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 "or the like") provided with this embodiment 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 recognized that embodiments of the present invention can be realized and implemented 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 the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. 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.
Further, operations of processes described in this embodiment can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described in this embodiment (or variations and/or combinations thereof) may be performed under the 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) collectively executed on one or more processors, by hardware, or combinations thereof. 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 interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied 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, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described in this embodiment includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein.
A computer program can be applied to input data to perform the functions described in the present embodiment to convert the input data to generate output data that is stored to a 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 particular visual depictions of physical and tangible objects produced on a display.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.

Claims (14)

1. A totem-pole power factor correction circuit, comprising:
the rectifier module comprises a plurality of unidirectional conduction units which are connected into a bridge shape, and each unidirectional conduction unit is respectively connected with a 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 rectifier module in parallel;
one end of 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 connection point of the first capacitor and the second capacitor;
and 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 the working parameters of the load.
2. The totem-pole power factor correction circuit of claim 1, wherein the rectification module comprises a first unidirectional conducting unit, a second unidirectional conducting unit, a third unidirectional conducting unit, a fourth unidirectional conducting unit, a first switch unit, a second switch unit, a third switch unit and a fourth switch 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 one-way conduction unit is connected with the negative pole of the second one-way conduction unit, the positive pole of the third one-way conduction unit is connected with the negative pole of the fourth one-way conduction unit, the negative pole of the first one-way conduction unit is connected with the negative pole of the third one-way conduction unit, the positive pole of the second one-way conduction unit is connected with the positive pole of the fourth one-way conduction unit, the negative pole of the first one-way conduction unit and the positive pole of the second one-way conduction unit are output ends of the rectification module, the positive pole of the first one-way conduction unit and the positive pole of the third one-way conduction unit are input ends of the rectification module.
3. The totem-pole power factor correction circuit of claim 2, wherein 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;
the current detection unit is used for detecting the current in the rectification module;
the parameter detection unit is used for detecting the working parameters of the load;
and 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 to realize the high-frequency switching mode or the synchronous rectification mode according to the voltage waveform of the alternating current power supply and the current in the rectification module.
4. The totem-pole power factor correction circuit of claim 3, wherein the determining to operate in the high-frequency switching mode or the synchronous rectification mode according to the operating parameter of the load specifically comprises:
when the working parameter of the load is in a first working parameter interval, determining to work in the high-frequency switching mode;
when the working parameter of the load is in a second working parameter interval, determining to work in the synchronous rectification mode; and the lower limit value in the second working parameter interval is greater than the upper limit value in the first working parameter interval.
5. The totem-pole power factor correction circuit of claim 3 or 4, wherein 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 conducted, otherwise, the first switch unit is turned off;
when the second unidirectional conducting unit has current flowing through, the second switch unit is conducted, otherwise, the second switch unit is turned off;
the third switching unit and the fourth switching unit are turned off.
6. The totem-pole power factor correction circuit of claim 3 or 4, wherein 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;
during a positive half period of a voltage waveform of the alternating current power supply, the third switching unit is turned off, and the fourth switching unit is turned on;
during a negative half-cycle of a voltage waveform of the ac power source, the third switching unit is turned on and the fourth switching unit is turned off.
7. The totem-pole power factor correction circuit according to claim 6, wherein the first switch unit and the second switch unit are alternately turned on and off, specifically comprising:
the first switch unit is switched on and off under the control of a PWM signal;
the second switch unit is switched on and off under the control of the inverted 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.
8. The totem-pole power factor correction circuit of claim 2, wherein the switch module comprises a fifth switch unit, a fifth unidirectional conducting unit, a sixth unidirectional conducting unit, a seventh unidirectional conducting unit and an eighth unidirectional conducting unit;
the anode of the fifth one-way conduction unit and the cathode of the sixth one-way conduction unit are connected in series to form a first branch circuit;
the anode of the seventh unidirectional conduction unit and the cathode of the eighth unidirectional conduction unit are connected in series to form a second branch circuit;
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 conducting 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;
and when the rectifying module and the switching module work in a synchronous rectifying mode, the fifth switching unit is conducted.
9. The totem-pole power factor correction circuit of claim 1, wherein the operating parameter is load power, load current, or load frequency.
10. The totem-pole power factor correction circuit of any one of claims 1-9, wherein the totem-pole power factor correction circuit further comprises an eleventh unidirectional conducting unit and a twelfth unidirectional conducting unit; the eleventh unidirectional conduction unit is connected between one end of the capacitor module and one output end of the rectifier module, and the twelfth unidirectional conduction unit is connected between the other end of the capacitor module and the other output end of the rectifier module.
11. A control method for controlling the totem-pole power factor correction circuit according to claim 2, characterized by comprising:
acquiring working parameters of the load, and controlling the rectification module and the switch module to work in a high-frequency switch mode or a synchronous rectification 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 conducted, otherwise, the first switch unit is turned off;
when the second unidirectional conducting unit has current flowing through, the second switch unit is conducted, 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;
during a positive half period of a voltage waveform of the alternating current power supply, the third switching unit is turned off, and the fourth switching unit is turned on;
during a negative half-cycle of a voltage waveform of the ac power source, the third switching unit is turned on and the fourth switching unit is turned off.
12. A storage medium having stored therein processor-executable instructions, which when executed by a processor, are configured to perform the method of claim 11.
13. A compressor, comprising:
the totem-pole power factor correction circuit of any one of claims 1-10;
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.
14. An air conditioner characterized by comprising the compressor of claim 13.
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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