CN108631627B - Rectification control method, air conditioner and computer readable storage medium - Google Patents

Rectification control method, air conditioner and computer readable storage medium Download PDF

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Publication number
CN108631627B
CN108631627B CN201810567693.0A CN201810567693A CN108631627B CN 108631627 B CN108631627 B CN 108631627B CN 201810567693 A CN201810567693 A CN 201810567693A CN 108631627 B CN108631627 B CN 108631627B
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state
switching
working state
power
switch unit
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CN108631627A (en
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李曹磊
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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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    • 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
    • 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
    • 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
    • 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
    • H02M7/2195—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 the switches being synchronously commutated at the same frequency of the AC input voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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 rectification control method, which comprises the following steps: acquiring the current apparent power of the FPC circuit or the useful work power of the compressor; determining a first working state matched with the apparent power or the useful work power based on a mapping relation between a preset power threshold and the working state of the PFC circuit; determining whether the first working state is consistent with a current second working state of the PFC circuit; and when the first working state is inconsistent with the second working state, switching the working state of the PFC circuit to the first working state. The invention also discloses an air conditioner and a computer readable storage medium. The invention can reasonably realize the switching between the diode rectification state and the synchronous rectification state according to the apparent power or the useful power, and further reasonably switch the rectification mode of the FPC circuit according to the load weight, thereby reducing the switching loss of the FPC circuit and improving the energy efficiency of the air conditioner.

Description

Rectification control method, air conditioner and computer readable storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a rectification control method, an air conditioner and a computer readable storage medium.
Background
With the development of Power electronic technology, active PFC (Power Factor Correction) technology is widely used due to its advantages of high Power Factor, small harmonic current, stable output voltage, etc. At present, a BOOST type PFC is generally used, and the PFC has a simple structure and is convenient to control, but the efficiency is low. Therefore, on some occasions with higher requirements on efficiency, the bridgeless totem-pole PFC circuit is adopted, the number of devices on a loop is reduced, and the efficiency is improved.
Currently, in an air conditioner provided with a PFC circuit, the outdoor unit is rectified by a method including synchronous rectification and diode rectification. The control process of each switch unit is complex during synchronous rectification, but the switching loss of the synchronous rectification is lower than that of diode rectification, and relatively speaking, the rectifier circuit corresponding to the diode rectification has a simple structure, and the switching loss of the switch units can be reduced during low load.
Although the PFC circuit in the conventional air conditioner has both the synchronous rectification function and the diode rectification function, the switching loss of the air conditioner is still relatively high due to the fact that the PFC circuit is not reasonably switched between the synchronous rectification function and the diode rectification function.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a rectification control method, an air conditioner and a computer readable storage medium, and aims to solve the technical problem that the switching loss of the conventional air conditioner is high due to unreasonable switching between synchronous rectification and diode rectification.
In order to achieve the aim, the invention provides a rectification control method which is applied to an air conditioner provided with a PFC circuit, wherein a compressor of the air conditioner is electrically connected with the PFC circuit; the working state of the PFC circuit at least comprises a diode rectification state and a synchronous rectification state, and the rectification control method comprises the following steps:
acquiring the current apparent power of the PFC circuit or the useful work power of the compressor;
determining a first working state matched with the apparent power or the useful work power based on a mapping relation between a preset power threshold and the working state of the PFC circuit;
determining whether the first working state is consistent with a current second working state of the PFC circuit;
and when the first working state is inconsistent with the second working state, switching the working state of the PFC circuit to the first working state.
Further, the step of determining a first operating state matching the useful work power based on a mapping relationship between a preset power threshold and an operating state of the PFC circuit includes:
determining whether the apparent power is less than a first preset power threshold;
when the apparent power is smaller than a first preset power threshold value, determining that the first working state is a diode rectification state;
and when the apparent power is greater than or equal to a first preset power threshold value, determining that the first working state is a synchronous rectification state.
Further, the PFC circuit comprises a sampling resistor, and the sampling resistor is arranged between an alternating current power supply and a bridge circuit of the PFC circuit; the step of obtaining the current apparent power of the PFC circuit comprises the following steps:
and acquiring the current value of the sampling resistor and the voltage value of the alternating current power supply, and calculating the apparent power based on the current value and the voltage value.
Further, the step of determining a first operating state matching the useful work power based on a mapping relationship between a preset power threshold and an operating state of the PFC circuit includes:
determining whether the useful power is less than a second preset power threshold;
when the useful work power is smaller than a second preset power threshold value, determining that the useful work power and the first working state are in a diode rectification state;
and when the useful work power is greater than or equal to a second preset power threshold value, determining that the useful work power and the first working state are in a synchronous rectification state.
Further, the bridge circuit comprises a plurality of switch units, and the step of determining whether the first operating state is consistent with the current second operating state of the PFC circuit comprises:
acquiring a first switching state of each switching unit and a second switching state of each switching unit corresponding to the first working state;
determining whether the first operating state and the second operating state are consistent based on the first switching state and the second switching state.
Further, the bridge circuit comprises a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, and the first working state is a synchronous rectification state; after the step of switching the operating state of the PFC circuit to the first operating state when the first operating state is inconsistent with the second operating state, the rectification control method further includes:
determining whether positive and negative switching currently exists in the input voltage of the bridge circuit;
when positive and negative switching currently exists in the input voltage of the bridge circuit, determining whether the input voltage of the bridge circuit is in a positive half period after the positive and negative switching;
when the input voltage is in a positive half period after positive and negative switching, the first switch unit, the second switch unit and the third switch unit are controlled to be turned off, and when the duration of the positive half period of the input voltage reaches a preset time interval, the fourth switch unit is controlled to be turned on;
when the input current of the bridge circuit is monitored to be larger than zero, controlling the first switch unit to be conducted;
and controlling the first switch unit to be switched off when the input current of the bridge circuit is monitored to be equal to zero.
Further, after the step of determining whether the input voltage of the bridge circuit is in a positive half cycle after the positive and negative switching, the rectification control method further includes:
when the input voltage is in a negative half period after the positive and negative switching, controlling the first switch unit, the second switch unit and the fourth switch unit to be turned off, and controlling the third switch unit to be turned on when the duration of the negative half period of the input voltage reaches a preset time interval;
when the current input current of the bridge circuit is monitored to be less than zero, controlling the second switch unit to be conducted;
and controlling the second switch unit to be switched off when the input current of the bridge circuit is monitored to be equal to zero.
Further, the PFC circuit also comprises a bus capacitor and a reactor; wherein the content of the first and second substances,
the first switching unit and the second switching unit are connected in series to form a first branch circuit, the third switching unit and the fourth switching unit are connected in series to form a second branch circuit, and the first branch circuit and the second branch circuit are connected in parallel to form the bridge circuit;
a connection point of the first switching unit and the second switching unit is electrically connected to the ac power supply via the reactor; a connection point of the third switching unit and the fourth switching unit is electrically connected to the ac power supply via the sampling resistor;
the connection point of the first switch unit and the third switch unit is electrically connected with the positive electrode of the bus capacitor; and the connecting point of the second switch unit and the fourth switch unit is electrically connected with the negative electrode of the bus capacitor.
Further, to achieve the above object, the present invention also provides an air conditioner including: the rectifier control system comprises a memory, a processor and a rectifier control program stored on the memory and capable of running on the processor, wherein the rectifier control program realizes the steps of any one of the rectifier control methods when being executed by the processor.
In addition, to achieve the above object, the present invention also provides a computer-readable storage medium having a rectification control program stored thereon, the rectification control program implementing the steps of the rectification control method according to any one of the above aspects when executed by a processor.
According to the invention, the current apparent power of the PFC circuit or the useful power of the compressor is acquired, then the first working state matched with the apparent power or the useful power is determined based on the mapping relation between the preset power threshold and the working state of the PFC circuit, then whether the first working state is consistent with the current second working state of the PFC circuit or not is determined, and then when the first working state is inconsistent with the second working state, the working state of the PFC circuit is switched to the first working state, so that the switching between the diode rectification state and the synchronous rectification state can be reasonably realized according to the apparent power or the useful power, and further the rectification mode of the PFC circuit is reasonably switched according to the load, so that the switching loss of the PFC circuit is reduced, and the energy efficiency of the air conditioner is improved.
Drawings
FIG. 1 is a schematic diagram of an air conditioner in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a rectification control method according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a PFC circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram showing the flow of circuit current in the PFC circuit during the positive half cycle of the ac voltage under the diode rectification condition;
FIG. 5 Is a schematic diagram of the AC supply voltage Vs, the circuit current Is, and the time variation of the driving pulses of the switching units Q1-Q4 in the diode-rectified state;
fig. 6 is a schematic diagram showing the flow of circuit current in the PFC circuit during the positive half cycle of the ac voltage under synchronous rectification;
FIG. 7 Is a schematic diagram of the AC supply voltage Vs, the circuit current Is, and the time variation of the driving pulses of the switching units Q1-Q4 in the synchronous rectification state;
fig. 8 is a schematic diagram illustrating the switching of the operating state of the PFC circuit according to an embodiment of the rectification control method of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an air conditioner in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the air conditioner may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Optionally, the air conditioner may further include a camera, a Radio Frequency (RF) circuit, a sensor, an audio circuit, a WiFi module, and the like. Such as light sensors, motion sensors, and other sensors. Of course, the air conditioner may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., which are not described herein again.
Those skilled in the art will appreciate that the air conditioner configuration shown in fig. 1 is not intended to be limiting of the air conditioner and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a switching program of the PFC circuit.
In the air conditioner shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be used to invoke a switching procedure of the PFC circuit stored in the memory 1005.
In the present embodiment, an air conditioner includes: the rectifier control system comprises a memory 1005, a processor 1001 and a rectifier control program stored on the memory 1005 and capable of running on the processor 1001, wherein when the processor 1001 calls the rectifier control program stored in the memory 1005, the following operations are executed:
acquiring the current apparent power of the PFC circuit or the useful work power of the compressor;
determining a first working state matched with the apparent power or the useful work power based on a mapping relation between a preset power threshold and the working state of the PFC circuit;
determining whether the first working state is consistent with a current second working state of the PFC circuit;
and when the first working state is inconsistent with the second working state, switching the working state of the PFC circuit to the first working state.
Further, the processor 1001 may call the rectification control program stored in the memory 1005, and also perform the following operations:
determining whether the apparent power is less than a first preset power threshold;
when the apparent power is smaller than a first preset power threshold value, determining that the first working state is a diode rectification state;
and when the apparent power is greater than or equal to a first preset power threshold value, determining that the first working state is a synchronous rectification state.
Further, the processor 1001 may call the rectification control program stored in the memory 1005, and also perform the following operations:
and acquiring the current value of the sampling resistor and the voltage value of the alternating current power supply, and calculating the apparent power based on the current value and the voltage value.
Further, the processor 1001 may call the rectification control program stored in the memory 1005, and also perform the following operations:
determining whether the useful power is less than a second preset power threshold;
when the useful work power is smaller than a second preset power threshold value, determining that the useful work power and the first working state are in a diode rectification state;
and when the useful work power is greater than or equal to a second preset power threshold value, determining that the useful work power and the first working state are in a synchronous rectification state.
Further, the processor 1001 may call the rectification control program stored in the memory 1005, and also perform the following operations:
acquiring a first switching state of each switching unit and a second switching state of each switching unit corresponding to the first working state;
determining whether the first operating state and the second operating state are consistent based on the first switching state and the second switching state.
Further, the processor 1001 may call the rectification control program stored in the memory 1005, and also perform the following operations:
determining whether positive and negative switching currently exists in the input voltage of the bridge circuit;
when positive and negative switching currently exists in the input voltage of the bridge circuit, determining whether the input voltage of the bridge circuit is in a positive half period after the positive and negative switching;
when the input voltage is in a positive half period after positive and negative switching, the first switch unit, the second switch unit and the third switch unit are controlled to be turned off, and when the duration of the positive half period of the input voltage reaches a preset time interval, the fourth switch unit is controlled to be turned on;
when the input current of the bridge circuit is monitored to be larger than zero, controlling the first switch unit to be conducted;
and controlling the first switch unit to be switched off when the input current of the bridge circuit is monitored to be equal to zero.
Further, the processor 1001 may call the rectification control program stored in the memory 1005, and also perform the following operations:
when the input voltage is in a negative half period after the positive and negative switching, controlling the first switch unit, the second switch unit and the fourth switch unit to be turned off, and controlling the third switch unit to be turned on when the duration of the negative half period of the input voltage reaches a preset time interval;
when the current input current of the bridge circuit is monitored to be less than zero, controlling the second switch unit to be conducted;
and controlling the second switch unit to be switched off when the input current of the bridge circuit is monitored to be equal to zero.
Referring to fig. 2 and 3, fig. 2 is a schematic flow chart of an embodiment of the rectification control method of the present invention, and fig. 3 is a schematic circuit structure of an embodiment of a PFC circuit of the present invention.
The rectification control method is applied to an air conditioner provided with a PFC circuit, and a compressor of the air conditioner is electrically connected with the PFC circuit; the working state of the PFC circuit at least comprises a diode rectification state and a synchronous rectification state.
Specifically, referring to fig. 3, the PFC circuit includes: bridge circuit, reactor L, bus capacitor C, sampling resistance R.
The bridge circuit is provided with a plurality of switch units connected in a bridge shape, the input end of the bridge circuit is connected with an alternating current power supply, and the output end of the bridge circuit is connected with a load (a compressor of an air conditioner). A reactor L is provided between the bridge circuit and the ac power supply. The reactor L stores electric power supplied from an ac power supply as energy, and performs voltage boosting and power factor improvement of the totem-pole PFC circuit by discharging the energy. And the bus capacitor C is electrically connected with the output end of the bridge circuit after being connected with the load in parallel. The sampling resistor R is provided between the alternating-current power supply and a bridge circuit of the PFC circuit, and specifically, is provided on a wiring between an output terminal of the bridge circuit and an output terminal of the alternating-current power supply AC.
The switching unit includes a first switching unit Q1, a second switching unit Q2, a third switching unit Q3, and a fourth switching unit Q4.
The first switching unit Q1 is connected in series with the second switching unit Q2 to form a first branch, the third switching unit Q3 is connected in series with the fourth switching unit Q4 to form a second branch, and the first branch and the second branch are connected in parallel to form the bridge circuit 20.
A connection point of the first switching unit Q1 and the second switching unit Q2 is electrically connected to the alternating-current power supply AC via a reactor L; a connection point of the third switching unit Q3 and the fourth switching unit Q4 is electrically connected to the alternating current power supply AC via the sampling resistor R. The connection point of the first switching unit Q1 and the third switching unit Q3 is electrically connected with the anode of the bus capacitor C; the connection point of the second switching unit Q2 and the fourth switching unit Q4 is electrically connected with the negative electrode of the bus capacitor C.
Specifically, the first switch unit Q1, the second switch unit Q2, the third switch unit Q3 and the fourth switch unit Q4 may be MOSFETs (Metal-Oxide-Semiconductor Field-Effect transistors), such as super-junction MOSFETs or SiC-MOSFETs. Preferably, the source of the first switching unit Q1 is electrically connected to the drain of the second switching unit Q2, and the connection point thereof is electrically connected to the ac power supply via the reactor L; the source of the third switching unit Q3 is electrically connected with the drain of the fourth switching unit Q4, and the connection point is electrically connected with an alternating current power supply; the drain electrode of the first switch unit Q1 is electrically connected with the drain electrode of the third switch unit Q3, and the connection point of the first switch unit Q1 is electrically connected with the anode of the bus capacitor C; the source of the second switching unit Q2 is electrically connected to the source of the fourth switching unit Q4, and the connection point thereof is electrically connected to the negative electrode of the bus capacitor C.
The first switching unit Q1 has a body diode D1 therein. The body diode D1 is part of a pn junction existing between the source and the drain of the first switching unit Q1. The saturation voltage (drain-source voltage in the on state) of the first switching unit Q1 is lower than the forward voltage drop of the body diode D1. Thus, the current flowing through the source and drain of the first switching unit Q1 has a smaller voltage drop than the current flowing through the body diode D1, and the conduction loss can be reduced. As is readily understood, flowing a current in the first switching unit Q1 in the on state reduces conduction loss as compared with flowing a current in the body diode D1 in the first switching unit Q1 in the off state. The same applies to the other switching units Q2 to Q4, that is, the second switching unit Q2 includes a body diode D2, the third switching unit Q3 includes a body diode D3, and the fourth switching unit Q4 includes a body diode D4.
In this embodiment, the rectification control method includes:
step S110, acquiring the current apparent power of the PFC circuit or the useful work power of the compressor;
in this embodiment, during the operation of the air conditioner, the current apparent power of the PFC circuit or the useful work power of the compressor may be obtained.
Specifically, the step of acquiring apparent power includes: and acquiring the current value of the sampling resistor and the voltage value of the alternating current power supply, and calculating the apparent power based on the current value and the voltage value.
The step of obtaining useful work power of the compressor comprises: and acquiring d-axis current, d-axis voltage, q-axis current and q-axis voltage of the compressor, and calculating the useful work power based on the d-axis current, the d-axis voltage, the q-axis current and the q-axis voltage.
Obtaining d-axis current i of compressordD-axis voltage udQ-axis current iqAnd q-axis voltage uqThen, the useful work power p can be calculated according to the following formulacomp：
pcomp＝udid+uqiq。
Step S120, determining a first working state matched with the apparent power or the useful work power based on a mapping relation between a preset power threshold and the working state of the PFC circuit;
in this embodiment, a mapping relationship between a preset power threshold and a working state of the PFC circuit may be preset, and when the apparent power or the useful power is obtained, a first working state matched with the apparent power or the useful power is obtained according to the apparent power or the useful power and the mapping relationship between the preset power threshold and the working state of the PFC circuit.
Step S130, determining whether the first working state is consistent with the current second working state of the PFC circuit;
in this embodiment, whether the first operating state is consistent with the second operating state may be determined according to the switching state of each switching unit in the bridge circuit corresponding to the first operating state and the switching state of each switching unit corresponding to the current second operating state of the PFC circuit, that is, the current switching state of each switching unit (or the switching state of each switching unit within a preset time period before the current time), and specifically, when the switching state of each switching unit in the bridge circuit corresponding to the first operating state is consistent with the current switching state of each switching unit, it is determined that the first operating state is consistent with the second operating state.
Step S140, when the first operating state is inconsistent with the second operating state, switching the operating state of the PFC circuit to the first operating state.
In this embodiment, when the first operating state is inconsistent with the second operating state, the operating state of the PFC circuit is switched to the first operating state. For example, when the first operating state is a diode rectifying state and the second operating state is a synchronous rectifying state, the operating state of the PFC circuit is switched to the diode rectifying state, or when the first operating state is the synchronous rectifying state and the second operating state is the diode rectifying state, the operating state of the PFC circuit is switched to the synchronous rectifying state, so that the switching between the diode rectifying state and the synchronous rectifying state can be reasonably realized according to the apparent power or the useful power, and since the apparent power or the useful power is related to the load of the PFC circuit, the rectifying mode of the PFC circuit can be reasonably switched according to the weight of the load, thereby reducing the switching loss of the PFC circuit and improving the energy consumption of the air conditioner.
Referring to fig. 4 and 5, fig. 4 Is a schematic diagram showing a flow of a circuit current in a PFC circuit in a positive half cycle of an ac voltage in a diode-rectified state, and fig. 5 Is a schematic diagram showing temporal changes of an ac power supply voltage Vs, a circuit current Is, and driving pulses of switching units Q1 to Q4 in the diode-rectified state.
In fig. 4, in the PFC circuit, a circuit current Is (input current of the bridge circuit) flows in the order of the AC power supply AC-reactor L-body diode D1-bus capacitor C (load) -body diode D4-sampling resistor R-AC power supply AC. Similarly, in the positive half cycle of the alternating voltage in the diode rectification state, the circuit current Is flows through the PFC circuit according to the sequence of the alternating current power supply AC-the sampling resistor R-the body diode D3-the bus capacitor C (load) -the body diode D2-the reactor L-the alternating current power supply AC. In fig. 5, when the PFC is in the diode rectification state, the switching units Q1 to Q4 do not operate, and a driving pulse is not required.
When the PFC circuit is in the diode rectification state, the loss in the PFC circuit is mainly the tube voltage drop V of the diodedropThe instantaneous current value I can be obtained by sampling the resistorinstBecause 2 diodes flow during rectification, the voltage can be reduced according to the tube voltage VdropInstantaneous current value IinstThrough whichThe instantaneous power loss P on the diode is calculated bydiode
Pdiode＝2VdropIinst。
Therefore, to reduce the power loss of the PFC circuit, the tube voltage drop V is selected as much as possibledropA small switching unit.
Referring to fig. 6 and 7, fig. 6 Is a schematic diagram of a current flowing direction of a circuit in a PFC circuit in a positive half cycle of an ac voltage in a synchronous rectification state, fig. 7 Is a schematic diagram of an ac power voltage Vs, a circuit current Is, and time variations of driving pulses of the switching units Q1 to Q4 in the synchronous rectification state, a curve in fig. 7 Is a waveform curve of an apparent power or a useful power, and a straight line Is a first preset power threshold or a second preset power threshold.
When the PFC circuit is in the synchronous rectification state, the switching units Q1-Q4 need to be alternately turned on/off, in fig. 6 and 7, the first switching unit Q1 and the fourth switching unit Q4 are controlled to be turned on at appropriate time in the positive half cycle of the alternating-current voltage, the PFC circuit is effectively turned on in the high-level coincidence time period of the first switching unit Q1 and the fourth switching unit Q4, because the power device switches need a period of time and different device switches have certain difference, the driving signal of the fourth switching unit Q4 is a bit longer than that of the first switching unit Q1 to ensure that the effective on time is only controlled by the first switching unit Q1, which can be realized. In the negative half cycle of the ac voltage, the driving signals of the second and third switching units Q2 and Q3 are similar.
In fig. 6, in the PFC circuit, a circuit current Is (short-circuit current) flows in the order of the AC power supply AC-reactor L-the first switching unit Q1-the bus capacitor C (load) -the fourth switching unit Q4-the sampling resistor R-the AC power supply AC. Similarly, in the positive half cycle of the alternating-current voltage in the diode rectification state, the circuit current Is (short-circuit current) flows through the PFC circuit according to the sequence of the alternating-current power supply AC-the sampling resistor R-the third switching unit Q3-the bus capacitor C (load) -the second switching unit Q2-the reactor L-the alternating-current power supply AC.
Because the losses of the MOSFET are mainly switching loss and conduction loss, the switching frequency in the synchronous rectification is very low and can be ignored, and the PFC power isThe path loss is mainly conduction loss. In general, the on-resistance R of the switching unitONThe conduction loss P of the PFC circuit can be calculated by the following formula, and the conduction loss P is only 5-10 m omega
Figure GDA0002525179750000121
According to the formula, the loss of the PFC circuit during synchronous rectification is smaller than that during diode rectification.
Referring to fig. 8, fig. 8 is a schematic diagram illustrating a switching operation of a PFC circuit according to an embodiment of the rectification control method of the present invention; in fig. 8, when the operating state of the PFC circuit is the diode rectification state, the apparent power or the useful power is detected in real time, if the apparent power or the useful power is detected to be greater than or equal to the preset power threshold, the operating state of the PFC circuit is switched to the synchronous rectification state, and if the apparent power or the useful power is subsequently detected to be less than the preset power threshold, the operating state of the PFC circuit is switched to the diode rectification state again.
The rectification control method provided by the embodiment can obtain the current apparent power of the PFC circuit or the useful work power of the compressor, then, based on the mapping relation between the preset power threshold value and the working state of the PFC circuit, a first working state matched with the apparent power or the useful work power is determined, and then determining whether the first operating state is consistent with a current second operating state of the PFC circuit, then when the first working state is inconsistent with the second working state, the working state of the PFC circuit is switched to the first working state, the switching between the diode rectification state and the synchronous rectification state can be reasonably realized according to apparent power or useful work power, and then the rectification mode of the PFC circuit is reasonably switched according to the weight of the load so as to reduce the switching loss of the PFC circuit and improve the energy efficiency of the air conditioner.
A second embodiment of the rectification control method of the present invention is proposed based on the first embodiment, and in this embodiment, the step S120 includes:
step S121, determining whether the apparent power is smaller than a first preset power threshold value;
step S122, when the apparent power is smaller than a first preset power threshold, determining that the first working state is a diode rectification state;
step S123, when the apparent power is greater than or equal to a first preset power threshold, determining that the first working state is a synchronous rectification state.
In this embodiment, referring to fig. 8, when the apparent power is acquired, it is determined whether the apparent power is smaller than a first preset power threshold, when the apparent power is smaller than the first preset power threshold, it is determined that the first operating state is a diode rectification state, and when the apparent power is greater than or equal to the first preset power threshold, it is determined that the first operating state is a synchronous rectification state, so that the first operating state can be accurately determined according to the apparent power, and the accuracy of switching the operating states of the PFC circuit is improved.
Further, in other embodiments, step S120 includes: determining whether the useful power is less than a second preset power threshold; when the useful work power is smaller than a second preset power threshold value, determining that the useful work power and the first working state are in a diode rectification state; and when the useful work power is greater than or equal to a second preset power threshold value, determining that the useful work power and the first working state are in a synchronous rectification state.
In the embodiment, the first working state can be accurately determined according to the useful work power, and the accuracy of the working state switching of the PFC circuit is improved.
The first preset power threshold and the second preset power threshold can be reasonably set, for example, the first preset power threshold and the second preset power threshold can be reasonably set according to the working condition of the air conditioner.
In the rectification control method provided in this embodiment, whether the apparent power is smaller than a first preset power threshold is determined, and then when the apparent power is smaller than the first preset power threshold, it is determined that the first operating state is a diode rectification state, or when the apparent power is greater than or equal to the first preset power threshold, it is determined that the first operating state is a synchronous rectification state, and then the operating state of the PFC circuit is reasonably switched according to the apparent power, so that a rectification mode for reasonably switching the PFC circuit according to the weight of a load is implemented, switching loss of the PFC circuit is reduced, and energy efficiency of the air conditioner is further improved.
Based on the first embodiment, a second embodiment of the rectification control method of the present invention is proposed, in which the bridge circuit includes a plurality of switching units, and step S130 includes:
step S131, acquiring a first switching state of each switching unit and a second switching state of each switching unit corresponding to the first working state;
step S132, determining whether the first operating state and the second operating state are consistent based on the first switching state and the second switching state.
In this embodiment, the first switching state may be a switching state of each switching unit in a period before the current time, the second switching state may be a switching state of each switching unit in a period corresponding to the first operating state, and when the first switching state is consistent with the second switching state, it is determined that the first operating state is consistent with the second operating state. The period may be a complete voltage period of the alternating voltage of the alternating current power supply, including a positive half period and a negative half period of the alternating voltage, or may only include the positive half period or the negative half period of the alternating voltage.
According to the rectification control method provided by the embodiment, the first switching state of each switching unit and the second switching state of each switching unit corresponding to the first working state are obtained, and then whether the first working state is consistent with the second working state is determined based on the first switching state and the second switching state, so that whether the first working state is consistent with the second working state can be accurately determined according to the first switching state and the second switching state, the accuracy of switching the working states of the PFC circuit is improved, the switching loss of the PFC circuit is further reduced, and the energy efficiency of the air conditioner is improved.
Based on the first embodiment, a third embodiment of the rectification control method of the present invention is proposed, in this embodiment, the bridge circuit includes a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, the first operating state is a synchronous rectification state, and after step S140, the rectification control method further includes:
step S150, determining whether positive and negative switching exists in the input voltage of the bridge circuit at present;
in the present embodiment, when the operating state of the PFC circuit is switched to the synchronous rectification state, the PFC circuit performs the synchronous rectification operation, and specifically, the input voltage of the bridge circuit (i.e., the ac power supply voltage Vs) may be obtained in real time, and it may be determined whether the input voltage is switched between positive and negative (i.e., whether a zero crossing is reached).
Step S160, when the input voltage of the bridge circuit is switched between positive and negative, determining whether the input voltage of the bridge circuit is in a positive half period after the positive and negative switching;
in this embodiment, when there is positive and negative switching of the input voltage, it is determined whether the input voltage of the bridge circuit after the positive and negative switching is in a positive half period, that is, it is determined whether the input voltage of the bridge circuit before the positive and negative switching is greater than 0V, when the input voltage is greater than 0V, the input voltage of the bridge circuit after the positive and negative switching is in the positive half period, otherwise, the input voltage of the bridge circuit after the positive and negative switching is in the negative half period.
Step S170, when the input voltage is in a positive half period after the positive and negative switching, controlling the first switch unit, the second switch unit and the third switch unit to be turned off, and when the duration of the positive half period of the input voltage reaches a preset time interval, controlling the fourth switch unit to be turned on;
step S180, when the input current of the bridge circuit is monitored to be larger than zero, controlling the first switch unit to be conducted;
and step S190, when the input current of the bridge circuit is monitored to be equal to zero, controlling the first switch unit to be switched off.
In this embodiment, referring to fig. 7 and 8, when the input voltage is in a positive half cycle after positive and negative switching, the first switching unit, the second switching unit, and the third switching unit are controlled to be turned off, the fourth switching unit is controlled to be turned on, and the input current of the bridge circuit is monitored in real time, and if the input current of the bridge circuit is monitored to be greater than zero, the first switching unit is controlled to be turned on, and the input current of the bridge circuit is continuously monitored; if the input current of the bridge circuit is monitored to be equal to zero again, namely the input current of the bridge circuit is reduced to zero, the first switch unit is controlled to be turned off, and then the first switch unit and the fourth switch unit are simultaneously turned on in an interval in which the input current is larger than zero, so that synchronous rectification of the PFC circuit is realized, and the switching (conduction) loss of each switch unit is reduced.
The preset time interval may be reasonably set according to a working condition of the PFC circuit, and is smaller than a time interval from a time when the positive and negative switching of the input voltage is performed to a time when the input current is greater than zero, and of course, the preset time interval may be 0, that is, the fourth switching unit is controlled to be turned on while the first switching unit, the second switching unit, and the third switching unit are controlled to be turned off. The fourth switching unit may be controlled to be turned off between the moment the first switching unit is turned off and the input voltage enters a negative half-cycle, e.g. while the first switching unit is turned off, the fourth switching unit is controlled to be turned off at the same time.
The rectification control method provided by this embodiment is implemented by determining whether positive and negative switching currently exists in the input voltage of the bridge circuit, then determining whether the input voltage of the bridge circuit is in a positive half cycle after the positive and negative switching currently exists in the input voltage of the bridge circuit, then controlling the first switch unit, the second switch unit and the third switch unit to be turned off when the input voltage is in the positive half cycle after the positive and negative switching, and controlling the fourth switch unit to be turned on when the duration of the positive half cycle of the input voltage reaches a preset time interval, controlling the first switch unit to be turned on when the current input current of the bridge circuit is monitored to be greater than zero, and then controlling the first switch unit to be turned off when the current input current of the bridge circuit is monitored to be equal to zero, so as to achieve synchronous rectification of the PFC circuit in the positive half cycle of the input voltage, thereby reducing the switching (conduction) loss of each switching unit.
Based on the third embodiment, a fourth embodiment of the rectification control method of the present invention is proposed, and in this embodiment, after step S160, the rectification control method further includes:
step S200, when the input voltage is in a negative half period after the positive and negative switching, controlling the first switch unit, the second switch unit and the fourth switch unit to be turned off, and when the duration of the input voltage in the negative half period reaches a preset time interval, controlling the third switch unit to be turned on;
step S210, when the input current of the bridge circuit is monitored to be less than zero, controlling the second switch unit to be conducted;
step S220, when it is monitored that the input current of the bridge circuit is equal to zero, controlling the second switch unit to turn off.
In this embodiment, referring to fig. 7 and 8, when the input voltage is in a negative half-cycle after the positive and negative switching, the first switching unit, the second switching unit, and the fourth switching unit are controlled to be turned off, the third switching unit is controlled to be turned on, and the input current of the bridge circuit is monitored in real time, if the input current of the bridge circuit is monitored to be less than zero, the second switching unit is controlled to be turned on, and the input current of the bridge circuit is continuously monitored; if the input current of the bridge circuit is monitored to be equal to zero again, namely the input current of the bridge circuit is increased to zero, the second switch unit is controlled to be switched off, and then the second switch unit and the third switch unit are simultaneously switched on in an interval of the input current being less than zero, so that synchronous rectification of the PFC circuit is realized, and the switching (switching-on) loss of each switch unit is reduced.
It should be noted that, between the time when the second switching unit is turned off and the input voltage enters the positive half period, the third switching unit may be controlled to be turned off, for example, while the second switching unit is turned off, the third switching unit is controlled to be turned off at the same time.
According to the rectification control method provided by the embodiment, the first switch unit, the second switch unit and the fourth switch unit are controlled to be turned off when the input voltage is in a negative half period after positive and negative switching, the third switch unit is controlled to be turned on when the duration of the negative half period of the input voltage reaches a preset time interval, then the second switch unit is controlled to be turned on when the input current of the bridge circuit is monitored to be smaller than zero, and then the second switch unit is controlled to be turned off when the input current of the bridge circuit is monitored to be equal to zero, so that synchronous rectification of the PFC circuit can be realized in the negative half period of the input voltage, and the switching (conducting) loss of each switch unit is reduced.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where a rectification control program is stored on the computer-readable storage medium, and when executed by a processor, the rectification control program implements the following operations:
acquiring the current apparent power of the PFC circuit or the useful work power of the compressor;
determining a first working state matched with the apparent power or the useful work power based on a mapping relation between a preset power threshold and the working state of the PFC circuit;
determining whether the first working state is consistent with a current second working state of the PFC circuit;
and when the first working state is inconsistent with the second working state, switching the working state of the PFC circuit to the first working state.
Further, the rectification control program when executed by the processor further implements the following operations:
determining whether the apparent power is less than a first preset power threshold;
when the apparent power is smaller than a first preset power threshold value, determining that the first working state is a diode rectification state;
and when the apparent power is greater than or equal to a first preset power threshold value, determining that the first working state is a synchronous rectification state.
Further, the rectification control program when executed by the processor further implements the following operations:
and acquiring the current value of the sampling resistor and the voltage value of the alternating current power supply, and calculating the apparent power based on the current value and the voltage value.
Further, the rectification control program when executed by the processor further implements the following operations:
determining whether the useful power is less than a second preset power threshold;
when the useful work power is smaller than a second preset power threshold value, determining that the useful work power and the first working state are in a diode rectification state;
and when the useful work power is greater than or equal to a second preset power threshold value, determining that the useful work power and the first working state are in a synchronous rectification state.
Further, the rectification control program when executed by the processor further implements the following operations:
acquiring a first switching state of each switching unit and a second switching state of each switching unit corresponding to the first working state;
determining whether the first operating state and the second operating state are consistent based on the first switching state and the second switching state.
Further, the rectification control program when executed by the processor further implements the following operations:
determining whether positive and negative switching currently exists in the input voltage of the bridge circuit;
when positive and negative switching currently exists in the input voltage of the bridge circuit, determining whether the input voltage of the bridge circuit is in a positive half period after the positive and negative switching;
when the input voltage is in a positive half period after positive and negative switching, the first switch unit, the second switch unit and the third switch unit are controlled to be turned off, and when the duration of the positive half period of the input voltage reaches a preset time interval, the fourth switch unit is controlled to be turned on;
when the input current of the bridge circuit is monitored to be larger than zero, controlling the first switch unit to be conducted;
and controlling the first switch unit to be switched off when the input current of the bridge circuit is monitored to be equal to zero.
Further, the rectification control program when executed by the processor further implements the following operations:
when the input voltage is in a negative half period after the positive and negative switching, controlling the first switch unit, the second switch unit and the fourth switch unit to be turned off, and controlling the third switch unit to be turned on when the duration of the negative half period of the input voltage reaches a preset time interval;
when the current input current of the bridge circuit is monitored to be less than zero, controlling the second switch unit to be conducted;
and controlling the second switch unit to be switched off when the input current of the bridge circuit is monitored to be equal to zero.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (9)

1. A rectification control method is characterized by being applied to an air conditioner with a PFC circuit, wherein a compressor of the air conditioner is electrically connected with the PFC circuit; the working state of the PFC circuit at least comprises a diode rectification state and a synchronous rectification state, and the rectification control method comprises the following steps:
acquiring the current apparent power of the PFC circuit or the useful work power of the compressor;
determining a first working state matched with the apparent power or the useful power based on a mapping relation between a preset power threshold and the working state of the PFC circuit, wherein the first working state is a diode rectification state or a synchronous rectification state;
determining whether the first working state is consistent with a current second working state of the PFC circuit;
when the first working state is inconsistent with the second working state, the working state of the PFC circuit is switched to the first working state, wherein when the first working state is inconsistent with the second working state, the first working state is a synchronous rectification state, and the second working state is a diode rectification state;
wherein the bridge circuit comprises a plurality of switching units, and the step of determining whether the first operating state is consistent with the current second operating state of the PFC circuit comprises:
acquiring a first switching state of each switching unit and a second switching state of each switching unit corresponding to the first working state;
determining whether the first operating state and the second operating state are consistent based on the first switching state and the second switching state.
2. The commutation control method of claim 1, wherein the step of determining a first operating state matching the useful work power based on a mapping of a preset power threshold to an operating state of the PFC circuit comprises:
determining whether the apparent power is less than a first preset power threshold;
when the apparent power is smaller than a first preset power threshold value, determining that the first working state is a diode rectification state;
and when the apparent power is greater than or equal to a first preset power threshold value, determining that the first working state is a synchronous rectification state.
3. The commutation control method of claim 2, wherein the PFC circuit includes a sampling resistor provided between an ac power supply and a bridge circuit of the PFC circuit; the step of obtaining the current apparent power of the PFC circuit comprises the following steps:
and acquiring the current value of the sampling resistor and the voltage value of the alternating current power supply, and calculating the apparent power based on the current value and the voltage value.
4. The commutation control method of claim 1, wherein the step of determining a first operating state matching the useful work power based on a mapping of a preset power threshold to an operating state of the PFC circuit comprises:
determining whether the useful power is less than a second preset power threshold;
when the useful work power is smaller than a second preset power threshold value, determining that the useful work power and the first working state are in a diode rectification state;
and when the useful work power is greater than or equal to a second preset power threshold value, determining that the useful work power and the first working state are in a synchronous rectification state.
5. The commutation control method of any one of claims 1 to 4, wherein the bridge circuit comprises a first switching unit, a second switching unit, a third switching unit and a fourth switching unit, and the first operating state is a synchronous rectification state; after the step of switching the operating state of the PFC circuit to the first operating state when the first operating state is inconsistent with the second operating state, the rectification control method further includes:
determining whether positive and negative switching currently exists in the input voltage of the bridge circuit;
when positive and negative switching currently exists in the input voltage of the bridge circuit, determining whether the input voltage of the bridge circuit is in a positive half period after the positive and negative switching;
when the input voltage is in a positive half period after positive and negative switching, the first switch unit, the second switch unit and the third switch unit are controlled to be turned off, and when the duration of the positive half period of the input voltage reaches a preset time interval, the fourth switch unit is controlled to be turned on;
when the input current of the bridge circuit is monitored to be larger than zero, controlling the first switch unit to be conducted;
and controlling the first switch unit to be switched off when the input current of the bridge circuit is monitored to be equal to zero.
6. The commutation control method of claim 5, wherein after the step of determining whether the input voltage to the bridge circuit is in a positive half cycle after positive and negative switching, the commutation control method further comprises:
when the input voltage is in a negative half period after the positive and negative switching, controlling the first switch unit, the second switch unit and the fourth switch unit to be turned off, and controlling the third switch unit to be turned on when the duration of the negative half period of the input voltage reaches a preset time interval;
when the current input current of the bridge circuit is monitored to be less than zero, controlling the second switch unit to be conducted;
and controlling the second switch unit to be switched off when the input current of the bridge circuit is monitored to be equal to zero.
7. The commutation control method of claim 5, wherein the PFC circuit further comprises a bus capacitor and a reactor; wherein the content of the first and second substances,
the first switching unit and the second switching unit are connected in series to form a first branch circuit, the third switching unit and the fourth switching unit are connected in series to form a second branch circuit, and the first branch circuit and the second branch circuit are connected in parallel to form the bridge circuit;
a connection point of the first switching unit and the second switching unit is electrically connected to an alternating current power supply via the reactor; a connection point of the third switching unit and the fourth switching unit is electrically connected with the alternating current power supply through a sampling resistor;
the connection point of the first switch unit and the third switch unit is electrically connected with the positive electrode of the bus capacitor; and the connecting point of the second switch unit and the fourth switch unit is electrically connected with the negative electrode of the bus capacitor.
8. An air conditioner, characterized in that the air conditioner comprises: a memory, a processor and a commutation control program stored on the memory and executable on the processor, the commutation control program when executed by the processor implementing the steps of the commutation control method of any one of claims 1 to 7.
9. A computer-readable storage medium, characterized in that a rectification control program is stored thereon, which when executed by a processor implements the steps of the rectification control method according to any one of claims 1 to 7.
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