CN110868060B - 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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- CN110868060B CN110868060B CN201911204449.9A CN201911204449A CN110868060B CN 110868060 B CN110868060 B CN 110868060B CN 201911204449 A CN201911204449 A CN 201911204449A CN 110868060 B CN110868060 B CN 110868060B
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- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a control method, a 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 pulse signal, the amplitude of a bus voltage output by the PFC circuit is increased, and the control method comprises the following steps: detecting the bus voltage of the control circuit; and controlling to input a plurality of pulse signals to the switching device or controlling the PFC circuit to be in an intermittent state according to the bus voltage. 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 circuit technology, and in particular, to a control method, a control device, 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 pulse signal, an amplitude of a bus voltage output by the PFC circuit is increased, and the control method includes: detecting the bus voltage of the control circuit; and controlling to input a plurality of pulse signals to the switching device or controlling the PFC circuit to be in an intermittent state according to the bus voltage.
In the technical scheme, aiming at the condition that the load capacity is large and the bus voltage is low, the bus voltage is improved by inputting a plurality of pulse signals into the switching device, and aiming at the condition that the load capacity is small and the bus voltage is low, the PFC circuit is controlled to be in an intermittent state, namely the switching device of the PFC circuit is controlled to reduce the switching loss and the loss of the bus voltage, so that the harmonic performance and the efficiency of the control circuit are improved.
The load capacity corresponds to the power supply capacity required by load operation, namely that the switching device is not a continuous high-frequency switch, for example, when the moment that the bus voltage needs to be improved is determined to be T1, the moment that the plurality of pulse signals are input to the switching device at the moment T1 to the moment T2, the bus voltage still rises within the period of T2-T3 after the pulse signals are stopped to be input, and the bus voltage starts to fall after the moment T3 so as to maximally reduce the working time of the switching device.
It is worth particularly pointing out that the duty cycle and the frequency of the pulse signal are both adjustable, so as to solve the problem of being able to increase the bus voltage, thus ensuring the reliable operation of the load and reducing the harmonic signal in the control circuit.
In the above technical solution, according to the bus voltage, the control inputs a plurality of pulse signals to the switching device, specifically includes: determining a first bus voltage given value according to the load capacity of the control circuit; judging whether the bus voltage is smaller than or equal to a first bus voltage given value; and judging that the bus voltage is smaller than or equal to the first bus voltage given value, and controlling to input a plurality of pulse signals to the switching device.
According to the technical scheme, the first bus voltage given value is set according to the load capacity, so that the lower limit value of the bus voltage for maintaining the load operation is mainly determined, the load is prevented from suddenly losing power, and the reliability of the load operation is ensured.
In the above technical solution, it is determined that the bus voltage is less than or equal to the first bus voltage given value, and the input of a plurality of pulse signals to the switching device is controlled, specifically including: judging that the bus voltage is smaller than or equal to a first bus voltage given value, and predicting the next zero crossing moment of an alternating current signal input into a control circuit; from the next zero-crossing time, a plurality of pulse signals are input to the switching device.
In the technical scheme, the next zero crossing time of the alternating current signal input into the dynamic control circuit is predicted, and a plurality of pulse signals are input to the switching device from the next zero crossing time, so that the bus voltage can be timely improved, and the harmonic wave in the control circuit can be reduced.
In the above technical solution, the inputting a plurality of pulse signals to the switching device from the next zero crossing time specifically includes: determining a second bus voltage given value according to the load capacity of the control circuit; determining a signal difference between a first bus voltage setpoint and a second bus voltage setpoint; determining a half-wave period of the rising of the bus voltage according to the signal difference value, and recording the half-wave period as a boosting half-wave period; a plurality of pulse signals are input to the switching device from the zero crossing time of any one of the boosting half-wave periods.
In the technical scheme, a second bus voltage given value is determined according to the load capacity of the control circuit, and a boosting half-wave period is determined by determining a signal difference value between a first bus voltage given value and a second bus voltage given value, wherein the half-wave period is a complete half wave of an alternating current signal, a plurality of pulse signals are input to a switching device at the moment of a zero crossing point, so that the bus voltage is timely increased, and the possibility of sudden power failure of a load is reduced.
In the above technical solution, according to the bus voltage, the PFC circuit is controlled to be in an intermittent state, and specifically includes: determining a third bus voltage given value according to the load capacity of the control circuit; judging whether the bus voltage is greater than or equal to the third bus voltage given value; and judging that the bus voltage is larger than or equal to the third bus voltage given value, and controlling the PFC circuit to be in an intermittent state.
In the technical scheme, a third bus voltage given value is determined according to the load capacity of the control circuit, the third bus voltage given value is set for further improving the reliability of the control circuit, the third bus voltage given value is usually determined according to the withstand voltage index of the electrolytic capacitor and the withstand voltage index of the inverter switch, and the bus voltage of the control circuit when power is supplied is obtained, namely when the bus voltage is detected to be greater than or equal to the third bus voltage given value, the PFC circuit is controlled to be in an intermittent state, so that the PFC circuit is prevented from being broken down.
It is understood that the PFC circuit is in an intermittent state, i.e., the switch in the PFC circuit is controlled not to perform a switching action.
In the above technical solution, the PFC circuit is a boost PFC circuit, a power conversion device is provided between the boost PFC circuit and a power grid system to which an ac signal is input, and it is determined that the bus voltage is greater than or equal to the third bus voltage given value, and the PFC circuit is controlled to be in an intermittent state, which specifically includes: and judging that the bus voltage is greater than or equal to the third bus voltage given value, and controlling a switching device of the boost PFC circuit to cut off or synchronously rectify so as to enable the boost PFC circuit to be in the intermittent state, wherein the switching device cuts off or synchronously rectifies, 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.
In the technical scheme, the switching device of the boost PFC circuit is controlled to be cut off or synchronously rectified by judging that the bus voltage is larger than or equal to the third bus voltage given value, so that the boost PFC circuit is in the intermittent state, and the possibility that the switching device is broken down or burnt out 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, the 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 the power grid system of the ac signal, it is determined that the bus voltage is greater than or equal to the third bus voltage given value, and the PFC circuit is controlled to be in an intermittent state, and specifically further includes: and judging that the bus voltage is greater than or equal to the third bus voltage given value, and controlling the power tube to cut off or synchronously rectify so as to enable the totem pole type PFC circuit to be in the intermittent state, wherein the power tube is cut off or synchronously rectify, and the alternating current signal is converted into a direct current signal through the reverse bias diode and is accessed into a bus line.
In the technical scheme, the power tube is controlled to cut off or synchronously rectify by judging that the bus voltage is larger than or equal to the third bus voltage given value, so that the totem pole type PFC circuit is in the intermittent state, and the possibility of breakdown or burning of a switching device is reduced.
In the above technical solution, it is determined that the bus voltage is greater than or equal to the second bus voltage given value, and the PFC circuit is controlled to be in an intermittent state, and specifically includes: judging that the bus voltage is greater than or equal to a second bus voltage given value, and predicting the next zero crossing moment of an alternating current signal input into a control circuit; and determining that the next zero crossing moment is reached, and controlling the power tube to cut off or synchronously rectify so as to enable the PFC circuit to be in an intermittent state.
In the technical scheme, the bus voltage is judged to be greater than or equal to the second bus voltage given value, the next zero-crossing time of the alternating current signal input into the control circuit is predicted, the next zero-crossing time is confirmed, the power tube is controlled to be cut off or synchronously rectified, and therefore switching loss and bus voltage loss can be reduced, and harmonic waves in the control circuit can be 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 pulse signals according to the bus voltage, 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 bus voltage, and the first bus voltage given value, the second bus voltage given value and the third bus voltage given value can be adjusted at any time according to the bus voltage, so that the reliability, the harmonic performance and the power factor of the load operation are further improved.
The parameters corresponding to the pulse signals can be adjusted, and the purpose of adjusting the parameters is to improve the bus voltage.
In the above technical solution, further 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 above 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
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 BOOSTPFC of a control method according to one embodiment of the 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 diagram of voltage-current waveforms of a control method according to yet another embodiment of the present invention;
FIG. 8 shows a schematic block diagram of a control device according to one embodiment of the invention;
fig. 9 shows a schematic block diagram of a home device according to an embodiment of the present invention;
FIG. 10 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 10.
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 the bus voltage of the control circuit.
Step S104, controlling input of 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 bus voltage.
In the technical scheme, aiming at the condition that the load capacity is large and the bus voltage is low, the bus voltage is improved by inputting a plurality of pulse signals into the switching device, and aiming at the condition that the load capacity is small and the bus voltage is low, the PFC circuit is controlled to be in an intermittent state, namely the switching device of the PFC circuit is controlled to reduce the switching loss and the loss of the bus voltage, so that the harmonic performance and the efficiency of the control circuit are improved.
The load capacity corresponds to the power supply capacity required by load operation, namely that the switching device is not a continuous high-frequency switch, for example, when the moment that the bus voltage needs to be improved is determined to be T1, the moment that the plurality of pulse signals are input to the switching device at the moment T1 to the moment T2, the bus voltage still rises within the period of T2-T3 after the pulse signals are stopped to be input, and the bus voltage starts to fall after the moment T3 so as to maximally reduce the working time of the switching device.
It is worth particularly pointing out that the duty cycle and the frequency of the pulse signal are both adjustable, so as to solve the problem of being able to increase the bus voltage, thus ensuring the reliable operation of the load and reducing the harmonic signal in the control circuit.
In the above technical solution, according to the bus voltage, the control inputs a plurality of pulse signals to the switching device, specifically includes: determining a first bus voltage given value according to the load capacity of the control circuit; judging whether the bus voltage is smaller than or equal to a first bus voltage given value; and judging that the bus voltage is smaller than or equal to the first bus voltage given value, and controlling to input a plurality of pulse signals to the switching device.
According to the technical scheme, the first bus voltage given value is set according to the load capacity, so that the lower limit value of the bus voltage for maintaining the load operation is mainly determined, the load is prevented from suddenly losing power, and the reliability of the load operation is ensured.
In the above technical solution, it is determined that the bus voltage is less than or equal to the first bus voltage given value, and the input of a plurality of pulse signals to the switching device is controlled, specifically including: judging that the bus voltage is smaller than or equal to a first bus voltage given value, and predicting the next zero crossing moment of an alternating current signal input into a control circuit; from the next zero-crossing time, a plurality of pulse signals are input to the switching device.
In the technical scheme, the next zero crossing time of the alternating current signal input into the dynamic control circuit is predicted, and a plurality of pulse signals are input to the switching device from the next zero crossing time, so that the bus voltage can be timely improved, and the harmonic wave in the control circuit can be reduced.
In the above technical solution, the inputting a plurality of pulse signals to the switching device from the next zero crossing time specifically includes: determining a second bus voltage given value according to the load capacity of the control circuit; determining a signal difference between a first bus voltage setpoint and a second bus voltage setpoint; determining a half-wave period of the rising of the bus voltage according to the signal difference value, and recording the half-wave period as a boosting half-wave period; a plurality of pulse signals are input to the switching device from the zero crossing time of any one of the boosting half-wave periods.
In the technical scheme, a second bus voltage given value is determined according to the load capacity of the control circuit, and a boosting half-wave period is determined by determining a signal difference value between a first bus voltage given value and a second bus voltage given value, wherein the half-wave period is a complete half wave of an alternating current signal, a plurality of pulse signals are input to a switching device at the moment of a zero crossing point, so that the bus voltage is timely increased, and the possibility of sudden power failure of a load is reduced.
In the above technical solution, according to the bus voltage, the PFC circuit is controlled to be in an intermittent state, and specifically includes: determining a third bus voltage given value according to the load capacity of the control circuit; judging whether the bus voltage is greater than or equal to the third bus voltage given value; and judging that the bus voltage is larger than or equal to the third bus voltage given value, and controlling the PFC circuit to be in an intermittent state.
In the technical scheme, a third bus voltage given value is determined according to the load capacity of the control circuit, the third bus voltage given value is set for further improving the reliability of the control circuit, the third bus voltage given value is usually determined according to the withstand voltage index of the electrolytic capacitor and the withstand voltage index of the inverter switch, and the bus voltage of the control circuit when power is supplied is obtained, namely when the bus voltage is detected to be greater than or equal to the third bus voltage given value, the PFC circuit is controlled to be in an intermittent state, so that the PFC circuit is prevented from being broken down.
It is understood that the PFC circuit is in an intermittent state, i.e., the switch in the PFC circuit is controlled not to perform a switching action.
In the above technical solution, the PFC circuit is a boost PFC circuit, a power conversion device is provided between the boost PFC circuit and a power grid system to which an ac signal is input, and it is determined that the bus voltage is greater than or equal to the third bus voltage given value, and the PFC circuit is controlled to be in an intermittent state, which specifically includes: and judging that the bus voltage is greater than or equal to the third bus voltage given value, and controlling a switching device of the boost PFC circuit to cut off or synchronously rectify so as to enable the boost PFC circuit to be in the intermittent state, wherein the switching device cuts off or synchronously rectifies, 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.
In the technical scheme, the switching device of the boost PFC circuit is controlled to be cut off or synchronously rectified by judging that the bus voltage is larger than or equal to the third bus voltage given value, so that the boost PFC circuit is in the intermittent state, and the possibility that the switching device is broken down or burnt out 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, the 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 the power grid system of the ac signal, it is determined that the bus voltage is greater than or equal to the third bus voltage given value, and the PFC circuit is controlled to be in an intermittent state, and specifically further includes: and judging that the bus voltage is greater than or equal to the third bus voltage given value, and controlling the power tube to cut off or synchronously rectify so as to enable the totem pole type PFC circuit to be in the intermittent state, wherein the power tube is cut off or synchronously rectify, and the alternating current signal is converted into a direct current signal through the reverse bias diode and is accessed into a bus line.
In the technical scheme, the power tube is controlled to cut off or synchronously rectify by judging that the bus voltage is larger than or equal to the third bus voltage given value, so that the totem pole type PFC circuit is in the intermittent state, and the possibility of breakdown or burning of a switching device is reduced.
In the above technical solution, it is determined that the bus voltage is greater than or equal to the second bus voltage given value, and the PFC circuit is controlled to be in an intermittent state, and specifically includes: judging that the bus voltage is greater than or equal to a second bus voltage given value, and predicting the next zero crossing moment of an alternating current signal input into a control circuit; and determining that the next zero crossing moment is reached, and controlling the power tube to cut off or synchronously rectify so as to enable the PFC circuit to be in an intermittent state.
In the technical scheme, the bus voltage is judged to be greater than or equal to the second bus voltage given value, the next zero-crossing time of the alternating current signal input into the control circuit is predicted, the next zero-crossing time is confirmed, the power tube is controlled to be cut off or synchronously rectified, and therefore switching loss and bus voltage loss can be reduced, and harmonic waves in the control circuit can be 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 pulse signals according to the bus voltage, 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 bus voltage, and the first bus voltage given value, the second bus voltage given value and the third bus voltage given value can be adjusted at any time according to the bus voltage, so that the reliability, the harmonic performance and the power factor of the load operation are further improved.
The parameters corresponding to the pulse signals can be adjusted, and the purpose of adjusting the parameters is to improve the bus voltage.
In the above technical solution, further 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:
step S502, bus voltage detection, ac voltage detection.
Step S504, the current operation state is determined, if it is determined that the current circuit is in the synchronous rectification state, step S506 is continuously executed, and if it is determined that the current circuit is in the multi-pulse state, step S508 is continuously executed.
Step S506, 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 S506, and if it is determined that the bus voltage is less than the threshold value 1, the process continues to step S510.
In step S510, at the zero crossing point of the ac voltage, the PFC state is switched to the multi-pulse operation state.
Step S508, determining whether the bus voltage is greater than the threshold 2, if it is determined that the bus voltage is greater than the threshold 2, executing step S512, and if not, executing step S508.
In step S512, 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, 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 a switching device is opened, and when the other state is opened at a zero crossing point, harmonic signals in a 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 the voltage from continuously dropping to cause power failure, a plurality of pulse signals are input to the switching device at the zero crossing point, namely, the moment T1, the switching device is closed at the moment, when a plurality of pulse signals for a certain time are input, the input is immediately stopped, the bus voltage still rises within a period of T2-T3 after the pulse signals are stopped, and when the voltage value of a second threshold value of the bus voltage is reached, the switching device is opened, because if the voltage continues to rise, a phenomenon of breakdown of circuit devices possibly occurs, dangerous accidents occur, after the moment T3, the bus voltage starts to drop, the PFC circuit synchronously rectifies or cuts off to maximally reduce the working time of the switching device, further ensure the reliable operation of a load, the switching loss is reduced, and the working efficiency of the circuit is improved.
Example seven
As shown in fig. 7, a voltage-current waveform diagram illustrating a control method according to still another 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, bus voltage, input voltage, and input current.
The intermittent state is a state that a switching device is opened, and when the other state is opened at a zero crossing point, harmonic signals in a 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 the voltage from continuously dropping to cause power failure, a plurality of pulse signals are input to the switching device at the zero crossing point, namely, the moment T1, the switching device is closed at the moment, when a plurality of pulse signals for 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 stopped, and when the voltage value of a second threshold value of the bus voltage is reached, the switching device is opened, because if the voltage continues to rise, a phenomenon of breakdown of circuit devices possibly occurs, dangerous accidents occur, after the moment T3, the bus voltage starts to drop, the PFC circuit is cut off, so that the working time of the switching device is reduced, the reliable running of a load is ensured, the switching loss is reduced, and the working efficiency of the circuit is improved.
Example eight
As shown in fig. 8, an embodiment of the present invention further discloses a control device 800, where the control device 800 includes a processor 802, and the processor 802 implements the control method defined in any of the foregoing embodiments when executing a computer program. Therefore, the technical effects defined in any one of the above embodiments are not described herein.
The control device 800 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 nine
As shown in fig. 9, an embodiment of the present invention further provides an electrical home appliance 900, including: a load; a control device 800 as defined in any one of the embodiments above; 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 800, when executing a computer program, implements the steps of the control method as defined in any of the embodiments described above. Therefore, the control method according to any one of the above embodiments has technical effects, and will not be described herein. Optionally, the home appliance 900 includes at least one of an air conditioner, a refrigerator, a fan, a range hood, a dust collector, and a computer host.
Examples ten
As shown in fig. 10, an embodiment of the present invention further provides a computer readable storage medium 1000, where a computer program 1002 is stored in the computer readable storage medium 1000, and the computer program 1002 implements the steps of the control method disclosed in any one of the foregoing embodiments when executed by a processor, 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 1002, when executed by a processor, performs the steps of:
the bus voltage of the control circuit is detected.
According to the bus voltage, the input of a plurality of specified pulse signals to the switching device is controlled, or the PFC circuit is controlled to operate in a high-frequency switching mode.
In the technical scheme, aiming at the condition that the load capacity is large and the bus voltage is low, the bus voltage is improved by inputting a plurality of pulse signals into the switching device, and aiming at the condition that the load capacity is small and the bus voltage is low, the PFC circuit is controlled to be in an intermittent state, namely the switching device of the PFC circuit is controlled to reduce the switching loss and the loss of the bus voltage, so that the harmonic performance and the efficiency of the control circuit are improved.
The load capacity corresponds to the power supply capacity required by load operation, namely that the switching device is not a continuous high-frequency switch, for example, when the moment that the bus voltage needs to be improved is determined to be T1, the moment that the plurality of pulse signals are input to the switching device at the moment T1 to the moment T2, the bus voltage still rises within the period of T2-T3 after the pulse signals are stopped to be input, and the bus voltage starts to fall after the moment T3 so as to maximally reduce the working time of the switching device.
It is worth particularly pointing out that the duty cycle and the frequency of the pulse signal are both adjustable, so as to solve the problem of being able to increase the bus voltage, thus ensuring the reliable operation of the load and reducing the harmonic signal in the control circuit.
In the above technical solution, according to the bus voltage, the control inputs a plurality of pulse signals to the switching device, specifically includes: determining a first bus voltage given value according to the load capacity of the control circuit; judging whether the bus voltage is smaller than or equal to a first bus voltage given value; and judging that the bus voltage is smaller than or equal to the first bus voltage given value, and controlling to input a plurality of pulse signals to the switching device.
According to the technical scheme, the first bus voltage given value is set according to the load capacity, so that the lower limit value of the bus voltage for maintaining the load operation is mainly determined, the load is prevented from suddenly losing power, and the reliability of the load operation is ensured.
In the above technical solution, it is determined that the bus voltage is less than or equal to the first bus voltage given value, and the input of a plurality of pulse signals to the switching device is controlled, specifically including: judging that the bus voltage is smaller than or equal to a first bus voltage given value, and predicting the next zero crossing moment of an alternating current signal input into a control circuit; from the next zero-crossing time, a plurality of pulse signals are input to the switching device.
In the technical scheme, the next zero crossing time of the alternating current signal input into the dynamic control circuit is predicted, and a plurality of pulse signals are input to the switching device from the next zero crossing time, so that the bus voltage can be timely improved, and the harmonic wave in the control circuit can be reduced.
In the above technical solution, the inputting a plurality of pulse signals to the switching device from the next zero crossing time specifically includes: determining a second bus voltage given value according to the load capacity of the control circuit; determining a signal difference between a first bus voltage setpoint and a second bus voltage setpoint; determining a half-wave period of the rising of the bus voltage according to the signal difference value, and recording the half-wave period as a boosting half-wave period; a plurality of pulse signals are input to the switching device from the zero crossing time of any one of the boosting half-wave periods.
In the technical scheme, a second bus voltage given value is determined according to the load capacity of the control circuit, and a boosting half-wave period is determined by determining a signal difference value between a first bus voltage given value and a second bus voltage given value, wherein the half-wave period is a complete half wave of an alternating current signal, a plurality of pulse signals are input to a switching device at the moment of a zero crossing point, so that the bus voltage is timely increased, and the possibility of sudden power failure of a load is reduced.
In the above technical solution, according to the bus voltage, the PFC circuit is controlled to be in an intermittent state, and specifically includes: determining a third bus voltage given value according to the load capacity of the control circuit; judging whether the bus voltage is greater than or equal to the third bus voltage given value; and judging that the bus voltage is larger than or equal to the third bus voltage given value, and controlling the PFC circuit to be in an intermittent state.
In the technical scheme, a third bus voltage given value is determined according to the load capacity of the control circuit, the third bus voltage given value is set for further improving the reliability of the control circuit, the third bus voltage given value is usually determined according to the withstand voltage index of the electrolytic capacitor and the withstand voltage index of the inverter switch, and the bus voltage of the control circuit when power is supplied is obtained, namely when the bus voltage is detected to be greater than or equal to the third bus voltage given value, the PFC circuit is controlled to be in an intermittent state, so that the PFC circuit is prevented from being broken down.
It is understood that the PFC circuit is in an intermittent state, i.e., the switch in the PFC circuit is controlled not to perform a switching action.
In the above technical solution, the PFC circuit is a boost PFC circuit, a power conversion device is provided between the boost PFC circuit and a power grid system to which an ac signal is input, and it is determined that the bus voltage is greater than or equal to the third bus voltage given value, and the PFC circuit is controlled to be in an intermittent state, which specifically includes: and judging that the bus voltage is greater than or equal to the third bus voltage given value, and controlling a switching device of the boost PFC circuit to cut off or synchronously rectify so as to enable the boost PFC circuit to be in the intermittent state, wherein the switching device cuts off or synchronously rectifies, 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.
In the technical scheme, the switching device of the boost PFC circuit is controlled to be cut off or synchronously rectified by judging that the bus voltage is larger than or equal to the third bus voltage given value, so that the boost PFC circuit is in the intermittent state, and the possibility that the switching device is broken down or burnt out 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, the 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 the power grid system of the ac signal, it is determined that the bus voltage is greater than or equal to the third bus voltage given value, and the PFC circuit is controlled to be in an intermittent state, and specifically further includes: and judging that the bus voltage is greater than or equal to the third bus voltage given value, and controlling the power tube to cut off or synchronously rectify so as to enable the totem pole type PFC circuit to be in the intermittent state, wherein the power tube is cut off or synchronously rectify, and the alternating current signal is converted into a direct current signal through the reverse bias diode and is accessed into a bus line.
In the technical scheme, the power tube is controlled to cut off or synchronously rectify by judging that the bus voltage is larger than or equal to the third bus voltage given value, so that the totem pole type PFC circuit is in the intermittent state, and the possibility of breakdown or burning of a switching device is reduced.
In the above technical solution, it is determined that the bus voltage is greater than or equal to the second bus voltage given value, and the PFC circuit is controlled to be in an intermittent state, and specifically includes: judging that the bus voltage is greater than or equal to a second bus voltage given value, and predicting the next zero crossing moment of an alternating current signal input into a control circuit; and determining that the next zero crossing moment is reached, and controlling the power tube to cut off or synchronously rectify so as to enable the PFC circuit to be in an intermittent state.
In the technical scheme, the bus voltage is judged to be greater than or equal to the second bus voltage given value, the next zero-crossing time of the alternating current signal input into the control circuit is predicted, the next zero-crossing time is confirmed, the power tube is controlled to be cut off or synchronously rectified, and therefore switching loss and bus voltage loss can be reduced, and harmonic waves in the control circuit can be 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 pulse signals according to the bus voltage, 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 bus voltage, and the first bus voltage given value, the second bus voltage given value and the third bus voltage given value can be adjusted at any time according to the bus voltage, so that the reliability, the harmonic performance and the power factor of the load operation are further improved.
The parameters corresponding to the pulse signals can be adjusted, and the purpose of adjusting the parameters is to improve the bus voltage.
In the above technical solution, further 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 (11)
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 pulse signal, the amplitude of a bus voltage output by the PFC circuit increases, the control method comprising:
detecting a bus voltage of the control circuit;
controlling to input a plurality of pulse signals to the switching device or controlling the PFC circuit to be in an intermittent state according to the bus voltage;
controlling the input of a plurality of pulse signals to the switching device according to the bus voltage, specifically comprising:
determining a first bus voltage given value according to the load capacity of the control circuit;
judging whether the bus voltage is smaller than or equal to the first bus voltage given value;
determining that the bus voltage is less than or equal to the first bus voltage given value, and controlling to input a plurality of pulse signals to the switching device;
determining that the bus voltage is less than or equal to the first bus voltage given value, and controlling to input a plurality of pulse signals to the switching device, wherein the method specifically comprises the following steps of:
determining that the bus voltage is smaller than or equal to the first bus voltage given value, and predicting the next zero crossing time of an alternating current signal input into the control circuit;
Inputting a plurality of pulse signals to the switching device from the next zero crossing time;
inputting a plurality of pulse signals to the switching device from the next zero crossing time, specifically comprising:
determining a second bus voltage given value according to the load capacity of the control circuit;
determining a signal difference between the first bus voltage setpoint and the second bus voltage setpoint;
determining a half-wave period of the rising of the bus voltage according to the signal difference value, and recording the half-wave period as a boosting half-wave period;
and inputting a plurality of pulse signals to the switching device from the zero crossing time of any boosting half-wave period.
2. The control method according to claim 1, characterized in that the PFC circuit is controlled in an intermittent state according to the bus voltage, specifically comprising:
determining a third bus voltage given value according to the load capacity of the control circuit;
judging whether the bus voltage is greater than or equal to the third bus voltage given value;
and judging that the bus voltage is larger than or equal to the third bus voltage given value, and controlling the PFC circuit to be in an intermittent state.
3. The control method according to claim 2, wherein the PFC circuit is a boost PFC circuit, a power conversion device is provided between the boost PFC circuit and a power grid system to which an ac signal is input, and it is determined that the bus voltage is greater than or equal to the third bus voltage given value, and the PFC circuit is controlled to be in an intermittent state, specifically including:
Determining that the bus voltage is greater than or equal to the third bus voltage given value, controlling a switching device of the boost PFC circuit to be turned off or rectified synchronously so as to enable the boost PFC circuit to be in the intermittent state,
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.
4. The control method according to claim 2, 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 the power grid system of the ac signal, it is determined that the bus voltage is greater than or equal to the third bus voltage given value, and the PFC circuit is controlled to be in an intermittent state, and specifically further includes:
judging that the bus voltage is larger than or equal to the given value of the third bus voltage, controlling the power tube to cut off or synchronously rectify so as to enable the totem pole PFC circuit to be in the intermittent state,
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.
5. The control method according to any one of claims 2 to 4, characterized in that it is determined that the bus voltage is greater than or equal to the third bus voltage given value, and the PFC circuit is controlled in an intermittent state, specifically comprising:
judging that the bus voltage is larger than or equal to the third bus voltage given value, and predicting the next zero crossing time of the alternating current signal input into the control circuit;
and determining that the next zero crossing moment is reached, and controlling the power tube to cut off or synchronously rectify so as to enable the PFC circuit to be in the intermittent state.
6. 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 pulse signals according to the load capacity of the control circuit,
wherein the parameters include at least one of duration, number, pulse width, duty cycle, and frequency.
7. The control method according to any one of claims 1 to 4, characterized by detecting a bus voltage of 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.
8. 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 7.
9. An electrical home appliance, comprising:
a load;
the control device of claim 8;
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.
10. The home appliance of claim 9, 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.
11. 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 7.
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| CN113972826B (en) * | 2020-07-22 | 2023-09-19 | 广东美的制冷设备有限公司 | Totem pole PFC circuit, control method thereof, circuit board, air conditioner and storage medium |
| CN114325306B (en) * | 2021-12-03 | 2024-03-22 | 深圳科士达科技股份有限公司 | Inversion system connectivity detection method and device, electronic equipment and medium |
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| CN110011530A (en) * | 2019-05-17 | 2019-07-12 | 广东美的制冷设备有限公司 | Circuit of power factor correction and air conditioner |
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