CN110880863A - Control method, control device, household appliance and computer readable storage medium - Google Patents
Control method, control device, household appliance and computer readable storage medium Download PDFInfo
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- CN110880863A CN110880863A CN201911206787.6A CN201911206787A CN110880863A CN 110880863 A CN110880863 A CN 110880863A CN 201911206787 A CN201911206787 A CN 201911206787A CN 110880863 A CN110880863 A CN 110880863A
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- bus voltage
- 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, household electrical appliance equipment and a computer readable storage medium, wherein the control method is suitable for a control circuit, a Power Factor Correction (PFC) circuit is arranged in the control circuit, when a switch device in the PFC circuit receives a specified pulse signal, the amplitude of 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 controlling the PFC circuit to work in a high-frequency switching mode or a multi-pulse mode or controlling the PFC circuit to synchronously rectify or cut off the work according to the load quantity. By the technical scheme, normal operation of the load can be guaranteed, the voltage loss of the bus can be reduced under the condition of low load, the switching loss is reduced, and the harmonic performance and efficiency of the control circuit are improved.
Description
Technical Field
The present invention relates to the field of control technologies, and in particular, to a control method, a control apparatus, a home appliance, and a computer-readable storage medium.
Background
In the current inverter air-conditioning market, in order to improve the operating energy efficiency of a load, a rectifier, an inductor, a PFC (power factor Correction) module, an electrolytic capacitor and an inverter are generally used to form a control circuit of a motor (load).
In the related art, in order to reduce the power consumption of the BOOST PFC and the power consumption of the rectifier, the 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.
Moreover, any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily known to a person of ordinary skill in the art, and any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily widely known or forms part of common general knowledge in the field.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the 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 applied to 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 increases, and the control method includes: detecting a load amount operated by the control circuit; and controlling the PFC circuit to work in a high-frequency switching mode or a multi-pulse mode or controlling the PFC circuit to synchronously rectify or cut off the work according to the load quantity.
According to the technical scheme, the PFC circuit is controlled to work in a high-frequency switching mode or a multi-pulse mode according to the load, the voltage of the bus can be controlled to rise, so that the load can be ensured to run reliably, or the PFC circuit is controlled to synchronously rectify or cut off the work according to the load, so that the switching loss and the loss of the voltage of the bus are reduced, and the harmonic performance and the efficiency of the control circuit are improved.
In the above technical solution, according to the load, controlling the PFC circuit to operate in a high-frequency switching mode or a multi-pulse mode, or controlling the PFC circuit to synchronously rectify or stop the operation specifically includes: determining a first bus voltage given value and a second bus voltage given value according to the load; acquiring bus voltage when the control circuit supplies power; when the bus voltage is determined to be less 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 greater than the first voltage difference value, 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; or when the bus voltage is determined to be less 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 less than the second voltage difference value, controlling to continuously input a plurality of pulse signals to the switching device until the bus voltage is detected to be increased to the first bus voltage given value; or when the bus voltage is determined to be greater than or equal to the first bus voltage given value and the voltage difference value between the bus voltage and the first bus voltage given value is determined to be greater than the third voltage difference value, or when the bus voltage is determined to be greater than or equal to the second bus voltage given value, the synchronous rectification signal is controlled to be 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.
In the technical scheme, the given value of the first bus voltage is determined according to the load amount, mainly for determining the lower limit value of the bus voltage for maintaining the load operation, so as to avoid sudden power failure of the load and ensure the reliability of the load operation.
In addition, the given value of the second bus voltage is determined according to the load amount, the given value of the second bus voltage is smaller than or equal to the maximum threshold value of the bus voltage, namely the bus voltage reaches the given value of the second bus voltage, and the load operation can be guaranteed without increasing the bus voltage.
And finally, when the bus voltage is determined to be greater than or equal to the first bus voltage given value, and the voltage difference value between the bus voltage and the first bus voltage given value is determined to be greater than a third voltage difference value, or the bus voltage is determined to be greater than or equal to the second bus voltage given value, the bus voltage is higher, and the load operation requirement can be met without the work of a PFC circuit.
In addition, the value range of the first voltage difference value is 20V-100V, the value range of the second voltage difference value is 5V-20V, and the value range of the third voltage difference value is 5V-20V.
In the above technical solution, the method further comprises: 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, 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.
According to 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, the bus voltage is determined to be reduced, and when the bus voltage reduction rate is larger than or equal to the reduction rate threshold value, the fact that the plurality of pulse signals are not enough to increase the bus voltage is indicated, therefore, the switching device is controlled to continuously input the variable-frequency high-frequency pulse signals until the bus signal is detected to be increased to the given value of the first bus voltage, 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 that the voltage difference between the first bus voltage given value and the bus voltage is greater than the first voltage difference, controlling to continuously input a variable-frequency high-frequency pulse signal to the switching device until it is detected that the bus voltage increases to the first bus voltage given value, specifically including: when the bus voltage is determined to be smaller than 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 larger than the first voltage difference value, predicting the next zero-crossing time of the alternating current signal input into the control circuit; and controlling the PFC circuit to work in a high-frequency switching mode or a multi-pulse mode from the next zero-crossing time until the bus voltage reaches the first bus voltage set value.
In the technical scheme, when the bus voltage is determined to be smaller than 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 larger than the first voltage difference value, the bus voltage needs to be increased rapidly to avoid the power failure and the shutdown of a load.
In the above technical solution, the method further comprises: determining a signal difference between the bus voltage and a first bus voltage set value; determining a half-wave period of bus voltage reduction according to the signal difference value, and recording the half-wave period as a voltage reduction half-wave period; a plurality of specified pulse signals, or high-frequency switching signals, or synchronous rectification signals or cutoff signals are input to the switching device from the zero-crossing time of any voltage reduction half-wave period.
In the technical scheme, a signal difference value between a bus voltage and a given value of a first bus voltage is determined, a half-wave period of bus voltage reduction is determined according to the signal difference value and is recorded as a voltage reduction half-wave period, and in order to reduce harmonic signals, a plurality of specified pulse signals, or high-frequency switching signals, or synchronous rectification signals or cutoff signals are input to a switching device from the zero-crossing time of any voltage reduction half-wave period, namely, the working state of the switching device is controlled to change 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 disposed between the boost PFC circuit and a power grid system to which an ac signal is input, and controls the PFC circuit to stop working, and the method specifically includes: and controlling a switching device of the boost PFC circuit to cut off or synchronously rectify so as to cut off the boost PFC circuit to work, wherein the switching device cuts off or synchronously rectify, and the alternating current signal is converted into a direct current signal through the power conversion device and is connected to a bus line.
In the technical scheme, the boost PFC circuit is cut off to work by controlling the cut-off or synchronous rectification of a switching device of the boost PFC circuit, wherein the switching device is cut off or synchronous rectification, an alternating current signal is converted into a direct current signal through a power conversion device and is connected to a bus line, and 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-biased diode, the totem-pole PFC circuit is connected to a power grid system of an ac signal to control the PFC circuit to stop working, and the method specifically includes: and controlling the power tube to cut off or synchronously rectify the alternating current to enable the totem-pole PFC circuit to cut off and work, wherein the power tube cuts off or synchronously rectify the alternating current, and the alternating current is converted into a direct current signal through the reverse bias diode and is connected to a bus line.
In the technical scheme, the totem-pole PFC circuit is cut off to work by controlling the cut-off or synchronous rectification of the power tube, wherein the power tube is cut off or synchronous rectified, an alternating current signal is converted into a direct current signal through the reverse bias diode and is connected to a bus line, so that the possibility that a switching device is broken down or burnt is reduced.
In the above technical solution, the method further comprises: detecting the operating 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, wherein the parameters comprise at least one of duration, number, pulse width, duty ratio and frequency.
In the technical scheme, the load quantity 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 quantity, the first bus voltage given value and the second bus voltage given value can be adjusted at any time according to the load quantity, and the reliability, the harmonic performance and the power factor of the load operation are further improved.
Parameters corresponding to 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, and only the boosting rates are different.
In the above technical solution, detecting a load amount operated by the control circuit specifically includes: detecting the operating parameters of the load, and analyzing the operating parameters to determine the back electromotive force and the rotating speed of the load; the amount of load is determined from the back emf and the rotational speed.
According to the technical scheme, the back electromotive force and the rotating speed of the load are determined by detecting the operating parameters of the load and analyzing the operating parameters, and finally the load capacity 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 load operation are comprehensively determined, and the reliability of the load operation is ensured.
An aspect of the second aspect of the present invention provides a control apparatus comprising a processor which, when executing a computer program, implements a control method as defined in any one of the above aspects.
Therefore, the technical effect defined by any one technical scheme is achieved, and details are not repeated herein.
A third aspect of the present invention provides a home appliance, including: a load; a control device as defined in any of the above claims; the control circuit is controlled by the control device and 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 implements the control method defined in any one of the above claims when executing the computer program.
Therefore, the technical effect of the control method defined by any one of the above technical schemes is achieved, and details are not repeated herein.
According to the third aspect of the present invention, the household electrical appliance optionally comprises at least one of an air conditioner, a refrigerator, a fan, a range hood, a dust collector and a computer host.
An aspect of the fourth aspect of the present invention provides a computer-readable storage medium, where a computer program is executed by a processor to implement the steps of the control method defined in any one of the above technical solutions, so that the technical effects of the control method defined in any one of the above technical solutions are achieved, and details are not repeated here.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a flow diagram of a control method according to an embodiment of the invention;
fig. 2 shows a circuit configuration diagram of a BOOST PFC according to a control method of an embodiment of the present invention;
fig. 3 shows a circuit configuration diagram of a totem-column type PFC according to a control method of an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a circuit of a control method according to an embodiment of the invention;
FIG. 5 shows a flow diagram of a control method according to an embodiment of the invention;
FIG. 6 shows a voltage-current waveform diagram of a control method according to an embodiment of the invention;
FIG. 7 shows a schematic block diagram of a control device according to an embodiment of the invention;
fig. 8 shows a schematic block diagram of a home device according to an embodiment of the present invention;
FIG. 9 shows a schematic block diagram of a computer-readable storage medium according to an embodiment of the invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
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 specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Some embodiments according to the invention are described below with reference to fig. 1 to 9.
Example one
As shown in fig. 1, a flow chart of a control method according to an embodiment of the invention is shown, which includes:
step S102, detecting a load amount operated by the control circuit.
And step S104, controlling to input a plurality of specified pulse signals to the switching device or controlling the PFC circuit to work in a high-frequency switching mode according to the load quantity.
According to the technical scheme, the PFC circuit is controlled to work in a high-frequency switching mode or a multi-pulse mode according to the load, the voltage of the bus can be controlled to rise, so that the load can be ensured to run reliably, or the PFC circuit is controlled to synchronously rectify or cut off the work according to the load, so that the switching loss and the loss of the voltage of the bus are reduced, and the harmonic performance and the efficiency of the control circuit are improved.
In the above technical solution, according to the load, controlling the PFC circuit to operate in a high-frequency switching mode or a multi-pulse mode, or controlling the PFC circuit to synchronously rectify or stop the operation specifically includes: determining a first bus voltage given value and a second bus voltage given value according to the load; acquiring bus voltage when the control circuit supplies power; when the bus voltage is determined to be less 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 greater than the first voltage difference value, 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; or when the bus voltage is determined to be less 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 less than the second voltage difference value, controlling to continuously input a plurality of pulse signals to the switching device until the bus voltage is detected to be increased to the first bus voltage given value; or when the bus voltage is determined to be greater than or equal to the first bus voltage given value and the voltage difference value between the bus voltage and the first bus voltage given value is determined to be greater than the third voltage difference value, or when the bus voltage is determined to be greater than or equal to the second bus voltage given value, the synchronous rectification signal is controlled to be 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.
In the technical scheme, the given value of the first bus voltage is determined according to the load amount, mainly for determining the lower limit value of the bus voltage for maintaining the load operation, so as to avoid sudden power failure of the load and ensure the reliability of the load operation.
In addition, the given value of the second bus voltage is determined according to the load amount, the given value of the second bus voltage is smaller than or equal to the maximum threshold value of the bus voltage, namely the bus voltage reaches the given value of the second bus voltage, and the load operation can be guaranteed without increasing the bus voltage.
And finally, when the bus voltage is determined to be greater than or equal to the first bus voltage given value, and the voltage difference value between the bus voltage and the first bus voltage given value is determined to be greater than a third voltage difference value, or the bus voltage is determined to be greater than or equal to the second bus voltage given value, the bus voltage is higher, and the load operation requirement can be met without the work of a PFC circuit.
In addition, the value range of the first voltage difference value is 20V-100V, the value range of the second voltage difference value is 5V-20V, and the value range of the third voltage difference value is 5V-20V.
In the above technical solution, the method further comprises: 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, 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.
According to 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, the bus voltage is determined to be reduced, and when the bus voltage reduction rate is larger than or equal to the reduction rate threshold value, the fact that the plurality of pulse signals are not enough to increase the bus voltage is indicated, therefore, the switching device is controlled to continuously input the variable-frequency high-frequency pulse signals until the bus signal is detected to be increased to the given value of the first bus voltage, 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 that the voltage difference between the first bus voltage given value and the bus voltage is greater than the first voltage difference, controlling to continuously input a variable-frequency high-frequency pulse signal to the switching device until it is detected that the bus voltage increases to the first bus voltage given value, specifically including: when the bus voltage is determined to be smaller than 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 larger than the first voltage difference value, predicting the next zero-crossing time of the alternating current signal input into the control circuit; and controlling the PFC circuit to work in a high-frequency switching mode or a multi-pulse mode from the next zero-crossing time until the bus voltage reaches the first bus voltage set value.
In the technical scheme, when the bus voltage is determined to be smaller than 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 larger than the first voltage difference value, the bus voltage needs to be increased rapidly to avoid the power failure and the shutdown of a load.
In the above technical solution, the method further comprises: determining a signal difference between the bus voltage and a first bus voltage set value; determining a half-wave period of bus voltage reduction according to the signal difference value, and recording the half-wave period as a voltage reduction half-wave period; a plurality of specified pulse signals, or high-frequency switching signals, or synchronous rectification signals or cutoff signals are input to the switching device from the zero-crossing time of any voltage reduction half-wave period.
In the technical scheme, a signal difference value between a bus voltage and a given value of a first bus voltage is determined, a half-wave period of bus voltage reduction is determined according to the signal difference value and is recorded as a voltage reduction half-wave period, and in order to reduce harmonic signals, a plurality of specified pulse signals, or high-frequency switching signals, or synchronous rectification signals or cutoff signals are input to a switching device from the zero-crossing time of any voltage reduction half-wave period, namely, the working state of the switching device is controlled to change 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 disposed between the boost PFC circuit and a power grid system to which an ac signal is input, and controls the PFC circuit to stop working, and the method specifically includes: and controlling a switching device of the boost PFC circuit to cut off or synchronously rectify so as to cut off the boost PFC circuit to work, wherein the switching device cuts off or synchronously rectify, and the alternating current signal is converted into a direct current signal through the power conversion device and is connected to a bus line.
In the technical scheme, the boost PFC circuit is cut off to work by controlling the cut-off or synchronous rectification of a switching device of the boost PFC circuit, wherein the switching device is cut off or synchronous rectification, an alternating current signal is converted into a direct current signal through a power conversion device and is connected to a bus line, and 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-biased diode, the totem-pole PFC circuit is connected to a power grid system of an ac signal to control the PFC circuit to stop working, and the method specifically includes: and controlling the power tube to cut off or synchronously rectify the alternating current to enable the totem-pole PFC circuit to cut off and work, wherein the power tube cuts off or synchronously rectify the alternating current, and the alternating current is converted into a direct current signal through the reverse bias diode and is connected to a bus line.
In the technical scheme, the totem-pole PFC circuit is cut off to work by controlling the cut-off or synchronous rectification of the power tube, wherein the power tube is cut off or synchronous rectified, an alternating current signal is converted into a direct current signal through the reverse bias diode and is connected to a bus line, so that the possibility that a switching device is broken down or burnt is reduced.
In the above technical solution, the method further comprises: detecting the operating 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, wherein the parameters comprise at least one of duration, number, pulse width, duty ratio and frequency.
In the technical scheme, the load quantity 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 quantity, the first bus voltage given value and the second bus voltage given value can be adjusted at any time according to the load quantity, and the reliability, the harmonic performance and the power factor of the load operation are further improved.
Parameters corresponding to 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, and only the boosting rates are different.
In the above technical solution, detecting a load amount operated by the control circuit specifically includes: detecting the operating parameters of the load, and analyzing the operating parameters to determine the back electromotive force and the rotating speed of the load; the amount of load is determined from the back emf and the rotational speed.
According to the technical scheme, the back electromotive force and the rotating speed of the load are determined by detecting the operating parameters of the load and analyzing the operating parameters, and finally the load capacity 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 load operation are comprehensively determined, and the reliability of the load operation is ensured.
Example two
As shown in fig. 2, a block diagram of a BOOST PFC circuit according to a control method of an embodiment of the present invention includes:
alternating current power supply AC, a diode D1, a diode D2, a diode D3, a diode D4, an inductance coil L, a power tube Q0, a capacitor C, an inverter bridge and a compressor.
Wherein, the PFC circuit includes: inductor L, diode D1, diode D2, diode D3, and diode D4. When the switch device is turned on, the AC signal AC is sent to the PFC circuit, and a pulse signal is output, wherein C is an electrolytic capacitor.
EXAMPLE III
As shown in fig. 3, a structural diagram of a totem-column PFC circuit showing a control method according to an embodiment of the present invention includes:
the power supply comprises an alternating current power supply AC, an inductance coil L, a diode D1, a diode D2, a diode D3 and a diode D4 which are respectively reverse-biased diodes of a power tube Q1, a power tube Q2, a power tube Q3 and a power tube Q4, and further comprises a capacitor C, an inverter bridge and a compressor, wherein the compressor is an embodiment of a load.
Wherein, the PFC circuit includes: the inductive coil L, the diode D1, the diode D2, the diode D3, the diode D4, the power tube Q1, the power tube Q2, the power tube Q3, the power tube Q4 and the totem-pole PFC circuit can carry out synchronous rectification.
Example four
As shown in fig. 4, a schematic diagram of a circuit of a control method according to an embodiment of the present invention is shown, including: the device 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 switching device Q1, the second switching device Q2, the third switching device Q3 and the fourth switching device Q4 are controlled by a Control Unit, and in addition, the ac voltage detection Unit, the bus voltage detection Unit and the current detection Unit also send detection signals to the Control Unit, wherein the Control Unit may be one of a Micro-programmed Control Unit (MCU), a Central Processing Unit (CPU), a Digital Signal Processor (DSP), and an embedded device, but is not limited thereto.
EXAMPLE five
As shown in fig. 5, a flow chart of a control method according to an embodiment of the invention is shown, which includes:
step S502, technical load demand.
Step S504, bus voltage detection and alternating voltage detection.
Step S506, determining the current operating state, continuing to execute step S510 if the current circuit state is determined to be the variable high-frequency operating state, and continuing to execute step S508 if the current circuit state is determined to be the multi-pulse partial switch state.
Step S508, determining whether the bus voltage is less than the threshold 1, returning to step S508 if the bus voltage is greater than or equal to the threshold 1, and continuing to execute step S512 if the bus voltage is less than the threshold 1.
Step S510, determining whether the bus voltage is greater than the threshold 2, if so, executing step S514, otherwise, executing step S510.
And step S512, switching the PFC state to a full-period high-frequency switch working state at the zero crossing point of the alternating-current voltage.
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, the PFC state is switched to the synchronous rectification state at the zero crossing point of the ac voltage.
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, zero crossing, synchronous rectified drive signal, multi-pulse drive signal, bus voltage, input voltage, and input current.
Wherein, the intermittent state is a state that the switching device is disconnected, and turning on another state at the zero crossing point can reduce the harmonic signal in the control circuit, as shown in fig. 6, when the time that the bus voltage needs to be increased is determined as T1, the bus voltage falls to the first bus voltage threshold, in order to prevent the power failure caused by the voltage continuous falling, at the zero crossing point, i.e. time T1, the switching device is controlled to work to the time T2 in a full-cycle high-frequency switching state, the switching device is closed, when a plurality of pulse signals with a certain time are input, the input of the pulse signals is stopped immediately, the bus voltage still rises in the time period from T2 to T3 after the input of the pulse signals is stopped, when the voltage value of the second threshold 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 if the voltage continues to rise, the, when a dangerous accident occurs, the bus voltage begins to drop in the time period from T3 to T4, and the PFC circuit synchronously rectifies or stops working, so that the working time of the switch device is reduced to the maximum extent, the reliable operation of the load is further ensured, the switching loss is reduced, and the working efficiency of the circuit is improved.
EXAMPLE seven
As shown in fig. 7, the embodiment of the present invention further discloses a control apparatus 700, where the control apparatus 700 includes a processor 702, and when the processor 702 executes a computer program, the control method according to any one of the first embodiment or the second embodiment is implemented. Therefore, the technical effects of any of the above embodiments are achieved, and are not described herein again.
The Control device 700 includes at least one logic computing device selected from a Micro-programmed Control Unit (MCU), a Central Processing Unit (CPU), a Digital Signal Processor (DSP), a single chip Microcomputer (MCU), and an embedded device.
Example eight
As shown in fig. 8, an embodiment of the present invention further provides a home appliance 800, including: a load; the control device 700 as defined in any one of the embodiments; the control circuit is controlled by the control device and 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 the computer program, implements the steps of the control method according to any of the embodiments of the present invention. Therefore, the technical effects of the control method of any of the above embodiments are not described herein. Optionally, the home appliance 800 includes at least one of an air conditioner, a refrigerator, a fan, a hood, a cleaner, and a computer mainframe.
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 when executed by a processor, the computer program 902 implements the steps of the control method disclosed in any of the above embodiments, so that the technical effects of the control method in any of the above embodiments are achieved, and details are not repeated herein.
In this embodiment, the computer program 902, when executed by a processor, implements the steps of:
detecting a load amount operated by the control circuit; and controlling the PFC circuit to work in a high-frequency switching mode or a multi-pulse mode or controlling the PFC circuit to synchronously rectify or cut off the work according to the load quantity.
According to the technical scheme, the PFC circuit is controlled to work in a high-frequency switching mode or a multi-pulse mode according to the load, the voltage of the bus can be controlled to rise, so that the load can be ensured to run reliably, or the PFC circuit is controlled to synchronously rectify or cut off the work according to the load, so that the switching loss and the loss of the voltage of the bus are reduced, and the harmonic performance and the efficiency of the control circuit are improved.
In the above technical solution, according to the load, controlling the PFC circuit to operate in a high-frequency switching mode or a multi-pulse mode, or controlling the PFC circuit to synchronously rectify or stop the operation specifically includes: determining a first bus voltage given value and a second bus voltage given value according to the load; acquiring bus voltage when the control circuit supplies power; when the bus voltage is determined to be less 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 greater than the first voltage difference value, 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; or when the bus voltage is determined to be less 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 less than the second voltage difference value, controlling to continuously input a plurality of pulse signals to the switching device until the bus voltage is detected to be increased to the first bus voltage given value; or when the bus voltage is determined to be greater than or equal to the first bus voltage given value and the voltage difference value between the bus voltage and the first bus voltage given value is determined to be greater than the third voltage difference value, or when the bus voltage is determined to be greater than or equal to the second bus voltage given value, the synchronous rectification signal is controlled to be 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.
In the technical scheme, the given value of the first bus voltage is determined according to the load amount, mainly for determining the lower limit value of the bus voltage for maintaining the load operation, so as to avoid sudden power failure of the load and ensure the reliability of the load operation.
In addition, the given value of the second bus voltage is determined according to the load amount, the given value of the second bus voltage is smaller than or equal to the maximum threshold value of the bus voltage, namely the bus voltage reaches the given value of the second bus voltage, and the load operation can be guaranteed without increasing the bus voltage.
And finally, when the bus voltage is determined to be greater than or equal to the first bus voltage given value, and the voltage difference value between the bus voltage and the first bus voltage given value is determined to be greater than a third voltage difference value, or the bus voltage is determined to be greater than or equal to the second bus voltage given value, the bus voltage is higher, and the load operation requirement can be met without the work of a PFC circuit.
In addition, the value range of the first voltage difference value is 20V-100V, the value range of the second voltage difference value is 5V-20V, and the value range of the third voltage difference value is 5V-20V.
In the above technical solution, the method further comprises: 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, 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.
According to 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, the bus voltage is determined to be reduced, and when the bus voltage reduction rate is larger than or equal to the reduction rate threshold value, the fact that the plurality of pulse signals are not enough to increase the bus voltage is indicated, therefore, the switching device is controlled to continuously input the variable-frequency high-frequency pulse signals until the bus signal is detected to be increased to the given value of the first bus voltage, 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 that the voltage difference between the first bus voltage given value and the bus voltage is greater than the first voltage difference, controlling to continuously input a variable-frequency high-frequency pulse signal to the switching device until it is detected that the bus voltage increases to the first bus voltage given value, specifically including: when the bus voltage is determined to be smaller than 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 larger than the first voltage difference value, predicting the next zero-crossing time of the alternating current signal input into the control circuit; and controlling the PFC circuit to work in a high-frequency switching mode or a multi-pulse mode from the next zero-crossing time until the bus voltage reaches the first bus voltage set value.
In the technical scheme, when the bus voltage is determined to be smaller than 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 larger than the first voltage difference value, the bus voltage needs to be increased rapidly to avoid the power failure and the shutdown of a load.
In the above technical solution, the method further comprises: determining a signal difference between the bus voltage and a first bus voltage set value; determining a half-wave period of bus voltage reduction according to the signal difference value, and recording the half-wave period as a voltage reduction half-wave period; a plurality of specified pulse signals, or high-frequency switching signals, or synchronous rectification signals or cutoff signals are input to the switching device from the zero-crossing time of any voltage reduction half-wave period.
In the technical scheme, a signal difference value between a bus voltage and a given value of a first bus voltage is determined, a half-wave period of bus voltage reduction is determined according to the signal difference value and is recorded as a voltage reduction half-wave period, and in order to reduce harmonic signals, a plurality of specified pulse signals, or high-frequency switching signals, or synchronous rectification signals or cutoff signals are input to a switching device from the zero-crossing time of any voltage reduction half-wave period, namely, the working state of the switching device is controlled to change 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 disposed between the boost PFC circuit and a power grid system to which an ac signal is input, and controls the PFC circuit to stop working, and the method specifically includes: and controlling a switching device of the boost PFC circuit to cut off or synchronously rectify so as to cut off the boost PFC circuit to work, wherein the switching device cuts off or synchronously rectify, and the alternating current signal is converted into a direct current signal through the power conversion device and is connected to a bus line.
In the technical scheme, the boost PFC circuit is cut off to work by controlling the cut-off or synchronous rectification of a switching device of the boost PFC circuit, wherein the switching device is cut off or synchronous rectification, an alternating current signal is converted into a direct current signal through a power conversion device and is connected to a bus line, and 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-biased diode, the totem-pole PFC circuit is connected to a power grid system of an ac signal to control the PFC circuit to stop working, and the method specifically includes: and controlling the power tube to cut off or synchronously rectify the alternating current to enable the totem-pole PFC circuit to cut off and work, wherein the power tube cuts off or synchronously rectify the alternating current, and the alternating current is converted into a direct current signal through the reverse bias diode and is connected to a bus line.
In the technical scheme, the totem-pole PFC circuit is cut off to work by controlling the cut-off or synchronous rectification of the power tube, wherein the power tube is cut off or synchronous rectified, an alternating current signal is converted into a direct current signal through the reverse bias diode and is connected to a bus line, so that the possibility that a switching device is broken down or burnt is reduced.
In the above technical solution, the method further comprises: detecting the operating 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, wherein the parameters comprise at least one of duration, number, pulse width, duty ratio and frequency.
In the technical scheme, the load quantity 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 quantity, the first bus voltage given value and the second bus voltage given value can be adjusted at any time according to the load quantity, and the reliability, the harmonic performance and the power factor of the load operation are further improved.
Parameters corresponding to 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, and only the boosting rates are different.
In the above technical solution, detecting a load amount operated by the control circuit specifically includes: detecting the operating parameters of the load, and analyzing the operating parameters to determine the back electromotive force and the rotating speed of the load; the amount of load is determined from the back emf and the rotational speed.
According to the technical scheme, the back electromotive force and the rotating speed of the load are determined by detecting the operating parameters of the load and analyzing the operating parameters, and finally the load capacity 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 load operation are comprehensively determined, and the reliability of the load operation is ensured.
In the present invention, the terms "first", "second", and "third" 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 limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 invention. In this specification, the schematic representations of the terms used above 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, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A control method is applicable to a control circuit, and is characterized in that a PFC circuit is arranged in the control circuit, and when a switch 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 an amount of load operated by the control circuit;
and controlling the PFC circuit to work in a high-frequency switching mode or a multi-pulse mode or controlling the PFC circuit to synchronously rectify or cut off the work according to the load quantity.
2. The control method according to claim 1, wherein controlling the PFC circuit to operate in a high-frequency switching mode or a multi-pulse mode, or controlling the PFC circuit to synchronously rectify or shut off according to the load amount specifically comprises:
determining a first bus voltage given value and a second bus voltage given value according to the load;
acquiring the bus voltage when the control circuit supplies power;
when the bus voltage is determined to be less than or equal to a 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 greater than a first voltage difference value, 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;
or when the bus voltage is determined to be less 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 less than a second voltage difference value, controlling to continuously input a plurality of pulse signals to the switching device until the bus voltage is detected to be increased to the first bus voltage given value;
or when the bus voltage is determined to be greater than or equal to the first bus voltage given value and the voltage difference value between the bus voltage and the first bus voltage given value is determined to be greater than a third voltage difference value, or when the bus voltage is determined to be greater than or equal to the second bus voltage given value, controlling to input a synchronous rectification signal to the switching device, or controlling to cut off the switching device until the bus voltage is detected to be reduced to the first bus voltage given value.
3. The control method according to claim 2, characterized by further comprising:
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 a 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.
4. The control method according to claim 2, wherein when it is determined that the bus voltage is less than or equal to a first bus voltage set point and that a voltage difference between the first bus voltage set point and the bus voltage is greater than a first voltage difference, controlling the input of the variable-frequency high-frequency pulse signal to the switching device to be continued until the bus voltage is detected to rise to the first bus voltage set point, specifically comprises:
predicting the next zero-crossing time of the alternating current signal input into the control circuit when the bus voltage is determined to be smaller than 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 larger than the first voltage difference value;
and controlling the PFC circuit to work in a high-frequency switching mode or a multi-pulse mode from the next zero-crossing time until the bus voltage reaches the first bus voltage set value.
5. The control method according to claim 2, characterized by further comprising:
determining a signal difference between the bus voltage and the first bus voltage setpoint;
determining a half-wave period of bus voltage reduction according to the signal difference value, and recording the half-wave period as a voltage reduction 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 one of the voltage reduction half-wave periods.
6. The method according to any one of claims 1 to 5, wherein the PFC circuit is a boost PFC circuit, a power conversion device is disposed between the boost PFC circuit and a power grid system to which an AC signal is input, and the method controls the PFC circuit to be turned off, and specifically includes:
controlling a switching device of the boost PFC circuit to cut off or synchronously rectify to make the boost PFC circuit 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 conversion device and is connected to a bus line.
7. The control method according to any one of claims 1 to 5, wherein the PFC circuit is a totem-pole PFC circuit, the totem-pole PFC circuit includes four bridge arms, the switching device connected to each bridge arm is a power tube, each power tube is connected to a reverse-biased diode, the totem-pole PFC circuit is connected to a power grid system of the alternating-current signal, and the control method controls the PFC circuit to be turned off and work, specifically including:
controlling the power tube to cut off or synchronously rectify to cut off the totem-pole PFC circuit,
the power tube is cut off or synchronously rectified, and the alternating current signal is converted into a direct current signal through the reverse bias diode and is connected to a bus line.
8. The control method according to any one of claims 1 to 5, characterized by further comprising:
detecting an operating parameter of the load to determine the load capacity of the output end of the control circuit;
determining the parameters corresponding to the specified pulse signals according to the load,
wherein the parameter includes at least one of a duration, a number, a pulse width, a duty cycle, and a frequency.
9. The control method according to any one of claims 1 to 5, wherein detecting the amount of load operated by the control circuit specifically comprises:
detecting an operating parameter of a load and resolving the operating parameter to determine a back electromotive force and a rotation speed of the load;
and determining the load according to the back electromotive force and the rotating speed.
10. A control apparatus comprising a processor, wherein the processor when executing a computer program implements:
the steps of the control method according to any one of claims 1 to 9.
11. An appliance, comprising:
a load;
the control device of claim 10;
the control circuit is controlled by the control device and 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.
12. The home device of claim 11,
the household appliance comprises at least one of an air conditioner, a refrigerator, a fan, a range hood, a dust collector and a computer host.
13. 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 9.
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