CN110880863B - Control method, control device, home appliance and computer readable storage medium - Google Patents
Control method, control device, home appliance and computer readable storage medium Download PDFInfo
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- CN110880863B CN110880863B CN201911206787.6A CN201911206787A CN110880863B CN 110880863 B CN110880863 B CN 110880863B CN 201911206787 A CN201911206787 A CN 201911206787A CN 110880863 B CN110880863 B CN 110880863B
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- given value
- pfc circuit
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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
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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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
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- 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
- H02P27/08—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 with pulse width modulation
- H02P27/085—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 with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention provides a control method, a control device, a household appliance and a computer readable storage medium, wherein the control method is suitable for a control circuit, a PFC (Power Factor Correction) circuit is arranged in the control circuit, when a switching device in the PFC circuit receives a specified pulse signal, the amplitude of a bus voltage output by the PFC circuit is increased, and the control method comprises the following steps: detecting a load amount operated by the control circuit; and according to the load quantity, controlling the PFC circuit to work in a high-frequency switch mode or a multi-pulse mode, or controlling the PFC circuit to synchronously rectify or cut off. Through the technical scheme of the invention, the normal operation of the load can be ensured, the bus voltage loss can be reduced under the condition of lower load capacity, and meanwhile, the switching loss is reduced, thereby being beneficial to improving the harmonic performance and efficiency of the control circuit.
Description
Technical Field
The present invention relates to the field of control technology, and in particular, to a control method, a control apparatus, a home appliance, and a computer readable storage medium.
Background
In the current variable frequency air conditioner market, in order to improve the running energy efficiency of a load, a control circuit of a motor (load) is generally formed by a rectifier, an inductor, a PFC (power factor correction) module, an electrolytic capacitor and an inverter.
In the related art, in order to reduce the power consumption of the BOOST PFC and the power consumption of the rectifier, a totem pole PFC module is used to replace the BOOST PFC and the rectifier, but the efficiency and the harmonic performance of the control circuit still need to be improved.
Furthermore, any discussion of the background throughout the specification is not an admission that such background is necessarily prior art to the type of prior art that was known to those skilled in the art, and that any discussion of the prior art throughout the specification is not an admission that such prior art is widely known or forms part of the common general knowledge in the field.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
In view of the above, an object of the present invention is to provide a control method.
Another object of the present invention is to provide a control device.
It is yet another object of the present invention to provide a home appliance.
It is yet another object of the present invention to provide a computer readable storage medium.
In order to achieve the above object, a technical solution of a first aspect of the present invention provides a control method, which is suitable for a control circuit, wherein the control circuit is provided with a PFC circuit, and when a switching device in the PFC circuit receives a specified pulse signal, an amplitude of a bus voltage output through the PFC circuit is increased, and the control method includes: detecting a load amount operated by the control circuit; and according to the load quantity, controlling the PFC circuit to work in a high-frequency switch mode or a multi-pulse mode, or controlling the PFC circuit to synchronously rectify or cut off.
According to the technical scheme, the PFC circuit is controlled to work in a high-frequency switch mode or a multi-pulse mode according to the load quantity, and the bus voltage can be controlled to rise to ensure that the load runs reliably, or the PFC circuit is controlled to synchronously rectify or cut off according to the load quantity, so that the switching loss and the loss of the bus voltage are reduced, and the harmonic performance and the efficiency of the control circuit are improved.
In the above technical solution, according to the load capacity, the PFC circuit is controlled to operate in a high-frequency switching mode or a multi-pulse mode, or the PFC circuit is controlled to operate in synchronous rectification or cut-off, which specifically includes: determining a first bus voltage given value and a second bus voltage given value according to the load quantity; acquiring bus voltage when the control circuit supplies power; when the bus voltage is determined to be smaller than or equal to a first bus voltage given value, and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference, continuously inputting a variable-frequency high-frequency pulse signal to the switching device until the bus voltage is detected to rise to the first bus voltage given value; or when the bus voltage is determined to be smaller than or equal to the first bus voltage given value, and the voltage difference between the first bus voltage given value and the bus voltage is determined to be smaller than the second voltage difference, controlling to continuously input a plurality of pulse signals to the switching device until the bus voltage is detected to rise to the first bus voltage given value; or determining that the bus voltage is greater than or equal to the first bus voltage given value, and when determining that the voltage difference between the bus voltage and the first bus voltage given value is greater than the third voltage difference, or determining that the bus voltage is greater than or equal to the second bus voltage given value, controlling to input a synchronous rectification signal to the switching device, or controlling the switching device to cut off until the bus voltage is detected to be reduced to the first bus voltage given value.
According to the technical scheme, the first bus voltage given value is determined according to the load quantity, and mainly, the lower limit value of the bus voltage for maintaining the load operation is determined so as to avoid sudden power failure of the load and ensure the reliability of the load operation, so that when the bus voltage is determined to be smaller than or equal to the first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference, the bus voltage is indicated to drop faster, and the load quantity is large, the variable-frequency high-frequency pulse signal is continuously input to the switching device so as to rapidly increase the bus voltage until the bus voltage is detected to be increased to the first bus voltage given value.
In addition, the second bus voltage given value is determined according to the load quantity, the second bus voltage given value is smaller than or equal to the bus voltage maximum threshold value, namely the bus voltage reaches the second bus voltage given value, and the load operation can be ensured without raising the bus voltage, so that when the bus voltage is determined to be smaller than or equal to the first bus voltage given value and the voltage difference value between the first bus voltage given value and the bus voltage is determined to be smaller than the second voltage difference value, the bus voltage falling speed is slow, the load quantity is small, a plurality of pulse signals are continuously input to the switching device until the bus voltage is detected to be raised to the first bus voltage given value.
And finally, determining that the bus voltage is greater than or equal to a first bus voltage given value, and when determining that the voltage difference between the bus voltage and the first bus voltage given value is greater than a third voltage difference, or determining that the bus voltage is greater than or equal to a second bus voltage given value, indicating that the bus voltage is higher, and meeting the load operation requirement without the PFC circuit, so that the synchronous rectification signal is input to the switching device or the switching device is controlled to be cut off until the bus voltage is detected to be reduced to the first bus voltage given value, the switching loss and the bus voltage loss can be effectively reduced, and meanwhile, the harmonic performance and the power factor are facilitated.
In addition, the range of the first voltage difference is 20V-100V, the range of the second voltage difference is 5V-20V, and the range of the third voltage difference is 5V-20V.
In the above technical solution, further includes: when a plurality of pulse signals are continuously input to the switching device, bus voltage when the control circuit supplies power is obtained; and when the bus voltage is determined to be reduced and the bus voltage reduction rate is greater than or equal to the reduction rate threshold value, controlling to continuously input a variable-frequency high-frequency pulse signal to the switching device until the bus signal is detected to be increased to the first bus voltage given value.
In the technical scheme, when a plurality of pulse signals are continuously input to the switching device, the bus voltage when the control circuit supplies power is obtained, and when the bus voltage is determined to be reduced and the bus voltage reduction rate is greater than or equal to the reduction rate threshold value, the plurality of pulse signals are insufficient to raise the bus voltage, so that the switching device is controlled to continuously input the variable-frequency high-frequency pulse signals until the bus signal is detected to be raised to the first bus voltage given value, and the reliability of load operation and the bus signal is further improved while the switching loss is reduced.
In the above technical solution, when it is determined that the bus voltage is less than or equal to the first bus voltage given value and it is determined that the voltage difference between the first bus voltage given value and the bus voltage is greater than the first voltage difference, the control unit continuously inputs the variable-frequency high-frequency pulse signal to the switching device until it is detected that the bus voltage rises to the first bus voltage given value, specifically including: when the bus voltage is determined to be smaller than a first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference, predicting the next zero crossing time of an alternating current signal input into the control circuit; and from the next zero crossing time, controlling the PFC circuit to operate in a high-frequency switch mode or a multi-pulse mode until the bus voltage is detected to reach the given value of the first bus voltage.
In the technical scheme, when the bus voltage is determined to be smaller than the first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference value, the bus voltage needs to be rapidly increased to avoid power-down shutdown of a load, in addition, in order to reduce harmonic signals and ripples, the next zero crossing time of an alternating current signal input into a control circuit is predicted, namely, the PFC circuit is controlled to work in a high-frequency switch mode or a multi-pulse mode from the next zero crossing time until the bus voltage is detected to reach the first bus voltage given value.
In the above technical solution, further includes: determining a signal difference between the bus voltage and a first bus voltage setpoint; determining a half-wave period of the voltage drop of the bus according to the signal difference value, and recording the half-wave period as a step-down half-wave period; from the zero crossing time of any step-down half-wave period, a plurality of designated pulse signals, or high-frequency switch signals, or synchronous rectification signals or cut-off signals are input to the switch device.
In the technical scheme, a signal difference value between a bus voltage and a first bus voltage given value is determined, a half-wave period of the bus voltage drop is determined according to the signal difference value and is recorded as a step-down half-wave period, a plurality of designated pulse signals, or high-frequency switch signals, or synchronous rectification signals or cut-off signals are input to a switch device from the zero crossing time of any step-down half-wave period for reducing harmonic signals, namely, the working state change of the switch device is controlled at the zero crossing time of an alternating current signal.
In the above technical solution, the PFC circuit is a boost PFC circuit, and a power conversion device is provided between the boost PFC circuit and a power grid system for inputting an ac signal, to control the PFC circuit to stop working, and specifically includes: and controlling the switching device of the boost PFC circuit to be cut off or synchronously rectified so as to cut off the boost PFC circuit, wherein the switching device is cut off or synchronously rectified, and an alternating current signal is converted into a direct current signal through a power conversion device and is connected into a bus line.
In the technical scheme, the switching device of the boost PFC circuit is controlled to be cut off or synchronously rectified so as to enable the boost PFC circuit to work, wherein the switching device is cut off or synchronously rectified, an alternating current signal is converted into a direct current signal through a power conversion device and is connected into a bus line, and therefore the possibility that the switching device is broken down or burnt is reduced.
In the above technical solution, the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, a switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse bias diode, the totem-pole PFC circuit is connected to a power grid system of an ac signal, and the totem-pole PFC circuit is controlled to stop working, and specifically includes: and controlling the cut-off or synchronous rectification of the power tube to cut-off the totem pole type PFC circuit, wherein the cut-off or synchronous rectification of the power tube converts an alternating current signal into a direct current signal through a reverse bias diode, and the direct current signal is connected into a bus line.
In the technical scheme, the totem pole type PFC circuit is cut off by controlling the power tube to cut off or synchronously rectify, wherein the power tube is cut off or synchronously rectify, an alternating current signal is converted into a direct current signal through a reverse biased diode and is connected into a bus line, so that the possibility of breakdown or burning of a switching device is reduced.
In the above technical solution, further includes: detecting the operation parameters of the load to determine the load capacity of the output end of the control circuit; and determining parameters corresponding to the specified pulse signals according to the load quantity, wherein the parameters comprise at least one of duration, number, pulse width, duty ratio and frequency.
According to the technical scheme, the load capacity of the output end of the control circuit is determined by detecting the operation parameters of the load, the parameters corresponding to the pulse signals are determined according to the load capacity, the given value of the first bus voltage and the given value of the second bus voltage can be adjusted at any time according to the load capacity, and the reliability, the harmonic performance and the power factor of the load operation are further improved.
The parameters corresponding to the pulse signals in the high-frequency switch mode or the multi-pulse mode can be adjusted, and the purpose of adjusting the parameters is to improve the bus voltage, but the boosting rates are different.
In the above technical solution, detecting the load amount operated by the control circuit specifically includes: detecting the operation parameters of the load, and analyzing the operation parameters to determine the back electromotive force and the rotating speed of the load; the load is determined according to the back electromotive force and the rotation speed.
According to the technical scheme, the operation parameters of the load are detected, the operation parameters are analyzed to determine the back electromotive force and the rotating speed of the load, and finally the load quantity is determined according to the back electromotive force and the rotating speed, so that the electric quantity and the bus voltage value required by the operation of the load are comprehensively determined, and the reliability of the operation of the load is ensured.
A second aspect of the present invention provides a control device comprising a processor which when executing a computer program implements a control method as defined in any of the above aspects.
Therefore, the technical effects defined by any one of the technical schemes are not described herein.
The technical solution of the third aspect of the present invention provides a home appliance, including: a load; a control device as defined in any one of the above claims; and the control circuit is controlled by the control device and is provided with a PFC circuit, and the PFC circuit comprises at least one switching device which is configured to control a power supply signal to supply power to a load. The processor of the control device, when executing the computer program, implements the control method defined by any one of the above technical solutions.
Therefore, the control method has the technical effects defined by any one of the technical schemes and is not repeated here.
According to the home appliance disclosed in the third aspect of the present invention, optionally, the home appliance includes at least one of an air conditioner, a refrigerator, a fan, a range hood, a dust collector, and a computer host.
The fourth aspect of the present invention provides a computer readable storage medium, where the steps of the control method defined in any one of the above claims are implemented when the computer program is executed by a processor, so that the technical effects of the control method defined in any one of the above claims are achieved, and are not described herein in detail.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 shows a flow diagram of a control method according to one embodiment of the invention;
fig. 2 shows a circuit configuration diagram of a BOOST PFC of a control method according to an embodiment of the present invention;
fig. 3 shows a circuit configuration diagram of a totem pole PFC of a control method according to an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a circuit of a control method according to one embodiment of the invention;
FIG. 5 shows a flow diagram of a control method according to one embodiment of the invention;
FIG. 6 shows a schematic diagram of a voltage-current waveform of a control method according to one embodiment of the invention;
FIG. 7 shows a schematic block diagram of a control device according to one embodiment of the invention;
fig. 8 shows a schematic block diagram of a home device according to an embodiment of the invention;
FIG. 9 shows a schematic block diagram of a computer-readable storage medium according to one embodiment of the invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
Some embodiments according to the present invention are described below with reference to fig. 1 to 9.
Example 1
As shown in fig. 1, a flow diagram of a control method according to an embodiment of the present invention is shown, including:
step S102, detecting a load amount operated by the control circuit.
Step S104, according to the load quantity, controlling to input a plurality of specified pulse signals to the switching device or controlling the PFC circuit to operate in a high-frequency switching mode.
According to the technical scheme, the PFC circuit is controlled to work in a high-frequency switch mode or a multi-pulse mode according to the load quantity, and the bus voltage can be controlled to rise to ensure that the load runs reliably, or the PFC circuit is controlled to synchronously rectify or cut off according to the load quantity, so that the switching loss and the loss of the bus voltage are reduced, and the harmonic performance and the efficiency of the control circuit are improved.
In the above technical solution, according to the load capacity, the PFC circuit is controlled to operate in a high-frequency switching mode or a multi-pulse mode, or the PFC circuit is controlled to operate in synchronous rectification or cut-off, which specifically includes: determining a first bus voltage given value and a second bus voltage given value according to the load quantity; acquiring bus voltage when the control circuit supplies power; when the bus voltage is determined to be smaller than or equal to a first bus voltage given value, and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference, continuously inputting a variable-frequency high-frequency pulse signal to the switching device until the bus voltage is detected to rise to the first bus voltage given value; or when the bus voltage is determined to be smaller than or equal to the first bus voltage given value, and the voltage difference between the first bus voltage given value and the bus voltage is determined to be smaller than the second voltage difference, controlling to continuously input a plurality of pulse signals to the switching device until the bus voltage is detected to rise to the first bus voltage given value; or determining that the bus voltage is greater than or equal to the first bus voltage given value, and when determining that the voltage difference between the bus voltage and the first bus voltage given value is greater than the third voltage difference, or determining that the bus voltage is greater than or equal to the second bus voltage given value, controlling to input a synchronous rectification signal to the switching device, or controlling the switching device to cut off until the bus voltage is detected to be reduced to the first bus voltage given value.
According to the technical scheme, the first bus voltage given value is determined according to the load quantity, and mainly, the lower limit value of the bus voltage for maintaining the load operation is determined so as to avoid sudden power failure of the load and ensure the reliability of the load operation, so that when the bus voltage is determined to be smaller than or equal to the first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference, the bus voltage is indicated to drop faster, and the load quantity is large, the variable-frequency high-frequency pulse signal is continuously input to the switching device so as to rapidly increase the bus voltage until the bus voltage is detected to be increased to the first bus voltage given value.
In addition, the second bus voltage given value is determined according to the load quantity, the second bus voltage given value is smaller than or equal to the bus voltage maximum threshold value, namely the bus voltage reaches the second bus voltage given value, and the load operation can be ensured without raising the bus voltage, so that when the bus voltage is determined to be smaller than or equal to the first bus voltage given value and the voltage difference value between the first bus voltage given value and the bus voltage is determined to be smaller than the second voltage difference value, the bus voltage falling speed is slow, the load quantity is small, a plurality of pulse signals are continuously input to the switching device until the bus voltage is detected to be raised to the first bus voltage given value.
And finally, determining that the bus voltage is greater than or equal to a first bus voltage given value, and when determining that the voltage difference between the bus voltage and the first bus voltage given value is greater than a third voltage difference, or determining that the bus voltage is greater than or equal to a second bus voltage given value, indicating that the bus voltage is higher, and meeting the load operation requirement without the PFC circuit, so that the synchronous rectification signal is input to the switching device or the switching device is controlled to be cut off until the bus voltage is detected to be reduced to the first bus voltage given value, the switching loss and the bus voltage loss can be effectively reduced, and meanwhile, the harmonic performance and the power factor are facilitated.
In addition, the range of the first voltage difference is 20V-100V, the range of the second voltage difference is 5V-20V, and the range of the third voltage difference is 5V-20V.
In the above technical solution, further includes: when a plurality of pulse signals are continuously input to the switching device, bus voltage when the control circuit supplies power is obtained; and when the bus voltage is determined to be reduced and the bus voltage reduction rate is greater than or equal to the reduction rate threshold value, controlling to continuously input a variable-frequency high-frequency pulse signal to the switching device until the bus signal is detected to be increased to the first bus voltage given value.
In the technical scheme, when a plurality of pulse signals are continuously input to the switching device, the bus voltage when the control circuit supplies power is obtained, and when the bus voltage is determined to be reduced and the bus voltage reduction rate is greater than or equal to the reduction rate threshold value, the plurality of pulse signals are insufficient to raise the bus voltage, so that the switching device is controlled to continuously input the variable-frequency high-frequency pulse signals until the bus signal is detected to be raised to the first bus voltage given value, and the reliability of load operation and the bus signal is further improved while the switching loss is reduced.
In the above technical solution, when it is determined that the bus voltage is less than or equal to the first bus voltage given value and it is determined that the voltage difference between the first bus voltage given value and the bus voltage is greater than the first voltage difference, the control unit continuously inputs the variable-frequency high-frequency pulse signal to the switching device until it is detected that the bus voltage rises to the first bus voltage given value, specifically including: when the bus voltage is determined to be smaller than a first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference, predicting the next zero crossing time of an alternating current signal input into the control circuit; and from the next zero crossing time, controlling the PFC circuit to operate in a high-frequency switch mode or a multi-pulse mode until the bus voltage is detected to reach the given value of the first bus voltage.
In the technical scheme, when the bus voltage is determined to be smaller than the first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference value, the bus voltage needs to be rapidly increased to avoid power-down shutdown of a load, in addition, in order to reduce harmonic signals and ripples, the next zero crossing time of an alternating current signal input into a control circuit is predicted, namely, the PFC circuit is controlled to work in a high-frequency switch mode or a multi-pulse mode from the next zero crossing time until the bus voltage is detected to reach the first bus voltage given value.
In the above technical solution, further includes: determining a signal difference between the bus voltage and a first bus voltage setpoint; determining a half-wave period of the voltage drop of the bus according to the signal difference value, and recording the half-wave period as a step-down half-wave period; from the zero crossing time of any step-down half-wave period, a plurality of designated pulse signals, or high-frequency switch signals, or synchronous rectification signals or cut-off signals are input to the switch device.
In the technical scheme, a signal difference value between a bus voltage and a first bus voltage given value is determined, a half-wave period of the bus voltage drop is determined according to the signal difference value and is recorded as a step-down half-wave period, a plurality of designated pulse signals, or high-frequency switch signals, or synchronous rectification signals or cut-off signals are input to a switch device from the zero crossing time of any step-down half-wave period for reducing harmonic signals, namely, the working state change of the switch device is controlled at the zero crossing time of an alternating current signal.
In the above technical solution, the PFC circuit is a boost PFC circuit, and a power conversion device is provided between the boost PFC circuit and a power grid system for inputting an ac signal, to control the PFC circuit to stop working, and specifically includes: and controlling the switching device of the boost PFC circuit to be cut off or synchronously rectified so as to cut off the boost PFC circuit, wherein the switching device is cut off or synchronously rectified, and an alternating current signal is converted into a direct current signal through a power conversion device and is connected into a bus line.
In the technical scheme, the switching device of the boost PFC circuit is controlled to be cut off or synchronously rectified so as to enable the boost PFC circuit to work, wherein the switching device is cut off or synchronously rectified, an alternating current signal is converted into a direct current signal through a power conversion device and is connected into a bus line, and therefore the possibility that the switching device is broken down or burnt is reduced.
In the above technical solution, the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, a switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse bias diode, the totem-pole PFC circuit is connected to a power grid system of an ac signal, and the totem-pole PFC circuit is controlled to stop working, and specifically includes: and controlling the cut-off or synchronous rectification of the power tube to cut-off the totem pole type PFC circuit, wherein the cut-off or synchronous rectification of the power tube converts an alternating current signal into a direct current signal through a reverse bias diode, and the direct current signal is connected into a bus line.
In the technical scheme, the totem pole type PFC circuit is cut off by controlling the power tube to cut off or synchronously rectify, wherein the power tube is cut off or synchronously rectify, an alternating current signal is converted into a direct current signal through a reverse biased diode and is connected into a bus line, so that the possibility of breakdown or burning of a switching device is reduced.
In the above technical solution, further includes: detecting the operation parameters of the load to determine the load capacity of the output end of the control circuit; and determining parameters corresponding to the specified pulse signals according to the load quantity, wherein the parameters comprise at least one of duration, number, pulse width, duty ratio and frequency.
According to the technical scheme, the load capacity of the output end of the control circuit is determined by detecting the operation parameters of the load, the parameters corresponding to the pulse signals are determined according to the load capacity, the given value of the first bus voltage and the given value of the second bus voltage can be adjusted at any time according to the load capacity, and the reliability, the harmonic performance and the power factor of the load operation are further improved.
The parameters corresponding to the pulse signals in the high-frequency switch mode or the multi-pulse mode can be adjusted, and the purpose of adjusting the parameters is to improve the bus voltage, but the boosting rates are different.
In the above technical solution, detecting the load amount operated by the control circuit specifically includes: detecting the operation parameters of the load, and analyzing the operation parameters to determine the back electromotive force and the rotating speed of the load; the load is determined according to the back electromotive force and the rotation speed.
According to the technical scheme, the operation parameters of the load are detected, the operation parameters are analyzed to determine the back electromotive force and the rotating speed of the load, and finally the load quantity is determined according to the back electromotive force and the rotating speed, so that the electric quantity and the bus voltage value required by the operation of the load are comprehensively determined, and the reliability of the operation of the load is ensured.
Example two
As shown in fig. 2, a block diagram of a BOOST PFC circuit of a control method according to an embodiment of the present invention includes:
AC power AC, diode D1, diode D2, diode D3, diode D4, inductor L, power tube Q0, capacitor C, inverter bridge, and compressor.
The PFC circuit comprises: inductor L, diode D1, diode D2, diode D3, and diode D4. When the switching device is turned on, an alternating current signal AC is supplied to the PFC circuit, and a pulse signal is output, wherein C is an electrolytic capacitor.
Example III
As shown in fig. 3, a block diagram of a totem pole PFC circuit according to a control method of one embodiment of the present invention includes:
The alternating current power supply AC, the inductance coil L, the diode D1, the diode D2, the diode D3 and the diode D4 are respectively reverse bias diodes of the power tube Q1, the power tube Q2, the power tube Q3 and the power tube Q4, and the alternating current power supply AC, the inductance coil L, the diode D1, the diode D2, the diode D3 and the diode D4 further comprise a capacitor C, an inverter bridge and a compressor, wherein the compressor is one embodiment of a load.
The PFC circuit comprises: the totem pole PFC circuit can carry out synchronous rectification.
Example IV
As shown in fig. 4, a schematic diagram of a circuit of a control method according to an embodiment of the present invention includes: the power supply comprises an alternating current power supply AC, a current detection unit, a PFC circuit, a capacitor C, a load, an alternating current voltage detection unit, a driving unit, a control unit and a bus voltage detection unit.
The first, second, third and fourth switching devices Q1, Q2, Q3 and Q4 are controlled by one control unit, and in addition, the ac voltage detecting unit, the bus voltage detecting unit and the current detecting unit also transmit detection signals to the control unit, wherein the control unit may be one of an MCU (Micro-programmed Control Unit, micro program controller), a CPU (Central Processing Unit ), a DSP (Digital Signal Processor, digital signal processor) and an embedded device, but is not limited thereto.
Example five
As shown in fig. 5, a flow diagram of a control method according to an embodiment of the present invention is shown, including:
in step S502, the technical load demand is calculated.
Step S504, bus voltage detection, ac voltage detection.
Step S506, determining the current operating state, if it is determined that the current circuit is in the variable high frequency operating state, continuing to execute step S510, and if it is determined that the current circuit is in the multi-pulse partial switch state, continuing to execute step S508.
Step S508, it is determined whether the bus voltage is less than the threshold value 1, and if it is determined that the bus voltage is greater than or equal to the threshold value 1, the process returns to step S508, and if it is determined that the bus voltage is less than the threshold value 1, the process continues to step S512.
Step S510 is to determine whether the bus voltage is greater than the threshold 2, if it is determined that the bus voltage is greater than the threshold 2, step S514 is executed, and if not, step S510 is executed.
In step S512, at the zero crossing point of the ac voltage, the PFC state is switched to the full-period high-frequency switching operation state.
Step S514, determining whether the bus voltage is greater than the threshold 3, if so, executing step S516, otherwise, executing step S518.
In step S516, the PFC state is switched to the intermittent state.
In step S518, at the zero crossing point of the ac voltage, the PFC state is switched to the synchronous rectification state.
Example six
As shown in fig. 6, a voltage-current waveform diagram illustrating a control method according to an embodiment of the present invention includes:
vertical axis voltage, first bus voltage threshold V1, second bus voltage threshold V2, third bus voltage threshold V3, horizontal axis state, intermittent state, on state, operating state, zero crossing, synchronous rectified drive signal, multi-pulse drive signal, bus voltage, input voltage, and input current.
The intermittent state is a state that the switching device is opened, the other state is opened at the zero crossing point, harmonic signals in the control circuit can be reduced, as shown in fig. 6, when the moment when the bus voltage needs to be increased is determined to be T1, the bus voltage drops to a first bus voltage threshold value, in order to prevent power failure caused by continuous voltage drop, the switching device is controlled to work to the moment T2 at the zero crossing point, namely at the moment T1, the switching device is closed, when a plurality of pulse signals with a certain time are input, the input is immediately stopped, the bus voltage still rises in a period of T2-T3 after the pulse signals are input, when the voltage value of a second threshold value of the bus voltage is reached, the switching device works in a multi-pulse partial switching state, the bus voltage is controlled to drop, because the phenomenon of breakdown of the circuit device possibly occurs, dangerous accidents occur, the bus voltage begins to drop in a period of T3-T4, the PFC circuit synchronously rectifies or cuts off, the working time of the switching device is reduced, further the reliable operation of the load is ensured, the switching loss is reduced, and the working efficiency of the circuit is improved.
Example seven
As shown in fig. 7, an embodiment of the present invention further discloses a control device 700, where the control device 700 includes a processor 702, and the processor 702 implements the control method according to any one of the first embodiment or the second embodiment when executing a computer program. Therefore, the technical effects of any of the above embodiments are not described herein.
The control device 700 includes at least one logic computing device selected from an MCU (Micro-programmed Control Unit, micro program controller), a CPU (Central Processing Unit ), a DSP (Digital Signal Processor, digital signal processor), a single chip microcomputer, and an embedded device.
Example eight
As shown in fig. 8, an embodiment of the present invention further provides an electric home appliance 800, including: a load; a control device 700 as defined in any of the embodiments; and the control circuit is controlled by the control device and is provided with a PFC circuit, and the PFC circuit comprises at least one switching device which is configured to control a power supply signal to supply power to a load.
The processor of the control device 700, when executing a computer program, implements the steps of the control method according to any of the embodiments of the present invention. Therefore, the control method of any one of the above embodiments has technical effects, and will not be described herein. Optionally, the home appliance 800 includes at least one of an air conditioner, a refrigerator, a fan, a range hood, a dust collector, and a computer host.
Example nine
As shown in fig. 9, an embodiment of the present invention further provides a computer readable storage medium 900, where a computer program 902 is stored in the computer readable storage medium 900, and the computer program 902, when executed by a processor, implements the steps of the control method disclosed in any one of the foregoing embodiments, so that the technical effects of the control method in any one of the foregoing embodiments are not repeated herein.
In this embodiment, the computer program 902, when executed by a processor, performs the steps of:
detecting a load amount operated by the control circuit; and according to the load quantity, controlling the PFC circuit to work in a high-frequency switch mode or a multi-pulse mode, or controlling the PFC circuit to synchronously rectify or cut off.
According to the technical scheme, the PFC circuit is controlled to work in a high-frequency switch mode or a multi-pulse mode according to the load quantity, and the bus voltage can be controlled to rise to ensure that the load runs reliably, or the PFC circuit is controlled to synchronously rectify or cut off according to the load quantity, so that the switching loss and the loss of the bus voltage are reduced, and the harmonic performance and the efficiency of the control circuit are improved.
In the above technical solution, according to the load capacity, the PFC circuit is controlled to operate in a high-frequency switching mode or a multi-pulse mode, or the PFC circuit is controlled to operate in synchronous rectification or cut-off, which specifically includes: determining a first bus voltage given value and a second bus voltage given value according to the load quantity; acquiring bus voltage when the control circuit supplies power; when the bus voltage is determined to be smaller than or equal to a first bus voltage given value, and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference, continuously inputting a variable-frequency high-frequency pulse signal to the switching device until the bus voltage is detected to rise to the first bus voltage given value; or when the bus voltage is determined to be smaller than or equal to the first bus voltage given value, and the voltage difference between the first bus voltage given value and the bus voltage is determined to be smaller than the second voltage difference, controlling to continuously input a plurality of pulse signals to the switching device until the bus voltage is detected to rise to the first bus voltage given value; or determining that the bus voltage is greater than or equal to the first bus voltage given value, and when determining that the voltage difference between the bus voltage and the first bus voltage given value is greater than the third voltage difference, or determining that the bus voltage is greater than or equal to the second bus voltage given value, controlling to input a synchronous rectification signal to the switching device, or controlling the switching device to cut off until the bus voltage is detected to be reduced to the first bus voltage given value.
According to the technical scheme, the first bus voltage given value is determined according to the load quantity, and mainly, the lower limit value of the bus voltage for maintaining the load operation is determined so as to avoid sudden power failure of the load and ensure the reliability of the load operation, so that when the bus voltage is determined to be smaller than or equal to the first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference, the bus voltage is indicated to drop faster, and the load quantity is large, the variable-frequency high-frequency pulse signal is continuously input to the switching device so as to rapidly increase the bus voltage until the bus voltage is detected to be increased to the first bus voltage given value.
In addition, the second bus voltage given value is determined according to the load quantity, the second bus voltage given value is smaller than or equal to the bus voltage maximum threshold value, namely the bus voltage reaches the second bus voltage given value, and the load operation can be ensured without raising the bus voltage, so that when the bus voltage is determined to be smaller than or equal to the first bus voltage given value and the voltage difference value between the first bus voltage given value and the bus voltage is determined to be smaller than the second voltage difference value, the bus voltage falling speed is slow, the load quantity is small, a plurality of pulse signals are continuously input to the switching device until the bus voltage is detected to be raised to the first bus voltage given value.
And finally, determining that the bus voltage is greater than or equal to a first bus voltage given value, and when determining that the voltage difference between the bus voltage and the first bus voltage given value is greater than a third voltage difference, or determining that the bus voltage is greater than or equal to a second bus voltage given value, indicating that the bus voltage is higher, and meeting the load operation requirement without the PFC circuit, so that the synchronous rectification signal is input to the switching device or the switching device is controlled to be cut off until the bus voltage is detected to be reduced to the first bus voltage given value, the switching loss and the bus voltage loss can be effectively reduced, and meanwhile, the harmonic performance and the power factor are facilitated.
In addition, the range of the first voltage difference is 20V-100V, the range of the second voltage difference is 5V-20V, and the range of the third voltage difference is 5V-20V.
In the above technical solution, further includes: when a plurality of pulse signals are continuously input to the switching device, bus voltage when the control circuit supplies power is obtained; and when the bus voltage is determined to be reduced and the bus voltage reduction rate is greater than or equal to the reduction rate threshold value, controlling to continuously input a variable-frequency high-frequency pulse signal to the switching device until the bus signal is detected to be increased to the first bus voltage given value.
In the technical scheme, when a plurality of pulse signals are continuously input to the switching device, the bus voltage when the control circuit supplies power is obtained, and when the bus voltage is determined to be reduced and the bus voltage reduction rate is greater than or equal to the reduction rate threshold value, the plurality of pulse signals are insufficient to raise the bus voltage, so that the switching device is controlled to continuously input the variable-frequency high-frequency pulse signals until the bus signal is detected to be raised to the first bus voltage given value, and the reliability of load operation and the bus signal is further improved while the switching loss is reduced.
In the above technical solution, when it is determined that the bus voltage is less than or equal to the first bus voltage given value and it is determined that the voltage difference between the first bus voltage given value and the bus voltage is greater than the first voltage difference, the control unit continuously inputs the variable-frequency high-frequency pulse signal to the switching device until it is detected that the bus voltage rises to the first bus voltage given value, specifically including: when the bus voltage is determined to be smaller than a first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference, predicting the next zero crossing time of an alternating current signal input into the control circuit; and from the next zero crossing time, controlling the PFC circuit to operate in a high-frequency switch mode or a multi-pulse mode until the bus voltage is detected to reach the given value of the first bus voltage.
In the technical scheme, when the bus voltage is determined to be smaller than the first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference value, the bus voltage needs to be rapidly increased to avoid power-down shutdown of a load, in addition, in order to reduce harmonic signals and ripples, the next zero crossing time of an alternating current signal input into a control circuit is predicted, namely, the PFC circuit is controlled to work in a high-frequency switch mode or a multi-pulse mode from the next zero crossing time until the bus voltage is detected to reach the first bus voltage given value.
In the above technical solution, further includes: determining a signal difference between the bus voltage and a first bus voltage setpoint; determining a half-wave period of the voltage drop of the bus according to the signal difference value, and recording the half-wave period as a step-down half-wave period; from the zero crossing time of any step-down half-wave period, a plurality of designated pulse signals, or high-frequency switch signals, or synchronous rectification signals or cut-off signals are input to the switch device.
In the technical scheme, a signal difference value between a bus voltage and a first bus voltage given value is determined, a half-wave period of the bus voltage drop is determined according to the signal difference value and is recorded as a step-down half-wave period, a plurality of designated pulse signals, or high-frequency switch signals, or synchronous rectification signals or cut-off signals are input to a switch device from the zero crossing time of any step-down half-wave period for reducing harmonic signals, namely, the working state change of the switch device is controlled at the zero crossing time of an alternating current signal.
In the above technical solution, the PFC circuit is a boost PFC circuit, and a power conversion device is provided between the boost PFC circuit and a power grid system for inputting an ac signal, to control the PFC circuit to stop working, and specifically includes: and controlling the switching device of the boost PFC circuit to be cut off or synchronously rectified so as to cut off the boost PFC circuit, wherein the switching device is cut off or synchronously rectified, and an alternating current signal is converted into a direct current signal through a power conversion device and is connected into a bus line.
In the technical scheme, the switching device of the boost PFC circuit is controlled to be cut off or synchronously rectified so as to enable the boost PFC circuit to work, wherein the switching device is cut off or synchronously rectified, an alternating current signal is converted into a direct current signal through a power conversion device and is connected into a bus line, and therefore the possibility that the switching device is broken down or burnt is reduced.
In the above technical solution, the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, a switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse bias diode, the totem-pole PFC circuit is connected to a power grid system of an ac signal, and the totem-pole PFC circuit is controlled to stop working, and specifically includes: and controlling the cut-off or synchronous rectification of the power tube to cut-off the totem pole type PFC circuit, wherein the cut-off or synchronous rectification of the power tube converts an alternating current signal into a direct current signal through a reverse bias diode, and the direct current signal is connected into a bus line.
In the technical scheme, the totem pole type PFC circuit is cut off by controlling the power tube to cut off or synchronously rectify, wherein the power tube is cut off or synchronously rectify, an alternating current signal is converted into a direct current signal through a reverse biased diode and is connected into a bus line, so that the possibility of breakdown or burning of a switching device is reduced.
In the above technical solution, further includes: detecting the operation parameters of the load to determine the load capacity of the output end of the control circuit; and determining parameters corresponding to the specified pulse signals according to the load quantity, wherein the parameters comprise at least one of duration, number, pulse width, duty ratio and frequency.
According to the technical scheme, the load capacity of the output end of the control circuit is determined by detecting the operation parameters of the load, the parameters corresponding to the pulse signals are determined according to the load capacity, the given value of the first bus voltage and the given value of the second bus voltage can be adjusted at any time according to the load capacity, and the reliability, the harmonic performance and the power factor of the load operation are further improved.
The parameters corresponding to the pulse signals in the high-frequency switch mode or the multi-pulse mode can be adjusted, and the purpose of adjusting the parameters is to improve the bus voltage, but the boosting rates are different.
In the above technical solution, detecting the load amount operated by the control circuit specifically includes: detecting the operation parameters of the load, and analyzing the operation parameters to determine the back electromotive force and the rotating speed of the load; the load is determined according to the back electromotive force and the rotation speed.
According to the technical scheme, the operation parameters of the load are detected, the operation parameters are analyzed to determine the back electromotive force and the rotating speed of the load, and finally the load quantity is determined according to the back electromotive force and the rotating speed, so that the electric quantity and the bus voltage value required by the operation of the load are comprehensively determined, and the reliability of the operation of the load is ensured.
In the present invention, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A control method, which is suitable for a control circuit, and is characterized in that the control circuit is provided with a PFC circuit, and when a switching device in the PFC circuit receives a specified pulse signal, the amplitude of a bus voltage output by the PFC circuit increases, the control method comprising:
detecting a load amount operated by the control circuit;
according to the load quantity, the PFC circuit is controlled to work in a high-frequency switch mode or a multi-pulse mode, or the PFC circuit is controlled to synchronously rectify or cut off;
according to the load, the PFC circuit is controlled to work in a high-frequency switch mode or a multi-pulse mode, or the PFC circuit is controlled to synchronously rectify or cut off, and the method specifically comprises the following steps:
determining a first bus voltage given value and a second bus voltage given value according to the load quantity;
acquiring bus voltage when the control circuit supplies power;
when the bus voltage is determined to be smaller than or equal to a first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference, continuously inputting a variable-frequency high-frequency pulse signal to the switching device until the bus voltage is detected to rise to the first bus voltage given value;
Or when the bus voltage is determined to be smaller than or equal to the first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be smaller than the second voltage difference, controlling to continuously input a plurality of pulse signals to the switching device until the bus voltage is detected to rise to the first bus voltage given value;
or determining that the bus voltage is greater than or equal to the first bus voltage given value, and when determining that the voltage difference between the bus voltage and the first bus voltage given value is greater than a third voltage difference, or determining that the bus voltage is greater than or equal to the second bus voltage given value, controlling to input a synchronous rectification signal to the switching device, or controlling the switching device to cut off until the bus voltage is detected to be reduced to the first bus voltage given value.
2. The control method according to claim 1, characterized by further comprising:
when a plurality of pulse signals are continuously input to the switching device, bus voltage when the control circuit supplies power is obtained;
and when the bus voltage is determined to be reduced and the bus voltage reduction rate is greater than or equal to the reduction rate threshold, controlling to continuously input a variable-frequency high-frequency pulse signal to the switching device until the bus voltage is detected to be increased to the first bus voltage given value.
3. The control method according to claim 1, wherein when it is determined that the bus voltage is less than or equal to a first bus voltage given value and it is determined that a voltage difference between the first bus voltage given value and the bus voltage is greater than a first voltage difference value, the control device continuously inputs a variable frequency high frequency pulse signal to the switching device until it is detected that the bus voltage rises to the first bus voltage given value, specifically comprising:
when the bus voltage is determined to be smaller than the first bus voltage given value and the voltage difference between the first bus voltage given value and the bus voltage is determined to be larger than the first voltage difference, predicting the next zero crossing time of an alternating current signal input into the control circuit;
and controlling the PFC circuit to work in a high-frequency switch mode or a multi-pulse mode from the next zero crossing moment until the bus voltage is detected to reach the given value of the first bus voltage.
4. The control method according to claim 1, characterized by further comprising:
determining a signal difference between the bus voltage and the first bus voltage setpoint;
determining a half-wave period of the voltage drop of the bus according to the signal difference value, and recording the half-wave period as a step-down half-wave period;
And inputting a plurality of specified pulse signals, or high-frequency switching signals, or synchronous rectification signals or cut-off signals to the switching device from the zero crossing time of any step-down half-wave period.
5. The control method according to any one of claims 1 to 4, wherein the PFC circuit is a boost PFC circuit, and a power conversion device is provided between the boost PFC circuit and a power grid system to which an ac signal is input, and the control method specifically includes:
the switching device of the boost PFC circuit is controlled to be cut off or synchronously rectified, so that the boost PFC circuit is cut off,
the switching device is cut off or synchronously rectified, and the alternating current signal is converted into a direct current signal through the power supply conversion device and is connected into a bus line.
6. The control method according to any one of claims 1 to 4, wherein the PFC circuit is a totem pole PFC circuit, the totem pole PFC circuit includes four bridge arms, the switching device to which each bridge arm is connected is a power tube, each power tube is connected to a reverse bias diode, the totem pole PFC circuit is connected to a power grid system of an ac signal, and the control of the PFC circuit to turn off specifically includes:
Controlling the cut-off or synchronous rectification of the power tube to cut-off the totem pole type PFC circuit,
the power tube is cut off or synchronously rectified, the alternating current signal is converted into a direct current signal through the reverse bias diode, and the direct current signal is connected into a bus line.
7. The control method according to any one of claims 1 to 4, characterized by further comprising:
detecting an operation parameter of the load to determine the load capacity of the output end of the control circuit;
determining parameters corresponding to the specified pulse signals according to the load quantity,
wherein the parameters include at least one of duration, number, pulse width, duty cycle, and frequency.
8. The control method according to any one of claims 1 to 4, characterized by detecting a load amount operated by the control circuit, specifically comprising:
detecting an operation parameter of a load, and analyzing the operation parameter to determine a counter electromotive force and a rotating speed of the load;
and determining the load according to the back electromotive force and the rotating speed.
9. A control device comprising a processor, wherein the processor when executing a computer program implements:
The step of a control method according to any one of claims 1 to 8.
10. An electrical home appliance, comprising:
a load;
the control device of claim 9;
the control circuit is controlled by the control device, and is provided with a PFC circuit, wherein the PFC circuit comprises at least one switching device, and the switching device is configured to control a power supply signal to supply power to a load.
11. The home appliance of claim 10, wherein the plurality of home appliances,
the household electrical appliance comprises at least one of an air conditioner, a refrigerator, a fan, a smoke exhaust ventilator, a dust collector and a computer host.
12. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed, implements the steps of the control method according to any one of claims 1 to 8.
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| CN111525787B (en) * | 2020-06-03 | 2021-04-09 | 珠海拓芯科技有限公司 | PFC control method and device, air conditioner and storage medium |
| CN113972822B (en) * | 2020-07-22 | 2024-01-16 | 广东美的制冷设备有限公司 | Power factor correction circuit, control method thereof, medium, compressor and air conditioner |
| CN113394964B (en) * | 2021-06-15 | 2023-06-09 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and PFC circuit applying same |
| CN114157133B (en) * | 2021-11-15 | 2023-08-25 | 海信（广东）空调有限公司 | Power factor self-adaptive control method and device, storage medium and air conditioner |
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| CN103280963B (en) * | 2013-04-26 | 2016-01-06 | 东南大学 | A kind of PFC control circuit reducing power tube conducting power consumption |
| US9112425B2 (en) * | 2013-06-14 | 2015-08-18 | Power Integrations, Inc. | Switch mode power converter having burst mode with current offset |
| CN106712528B (en) * | 2017-01-10 | 2018-11-20 | 上海蔚来汽车有限公司 | LLC resonant converter driving pulse number modulator approach and unit |
| CN109149922B (en) * | 2018-09-07 | 2020-07-24 | 国网江苏省电力有限公司苏州供电分公司 | Power factor correction circuit and alternating current charger for electric automobile using same |
| CN110233564A (en) * | 2019-07-05 | 2019-09-13 | 广东美的制冷设备有限公司 | Drive control circuit and household appliance |
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