CN112019031B - Operation control method, circuit, household appliance and computer readable storage medium - Google Patents
Operation control method, circuit, household appliance and computer readable storage medium Download PDFInfo
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- CN112019031B CN112019031B CN201910473279.8A CN201910473279A CN112019031B CN 112019031 B CN112019031 B CN 112019031B CN 201910473279 A CN201910473279 A CN 201910473279A CN 112019031 B CN112019031 B CN 112019031B
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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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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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 an operation control method, a circuit, household electrical appliance equipment and a computer readable storage medium, wherein the operation control method comprises the following steps: obtaining the operating parameters of the load, and comparing the magnitude relation between the operating parameters and the operating parameter threshold; and controlling the power factor correction module to work in a first mode or a second mode according to the magnitude relation between the operation parameter and the operation parameter threshold, wherein the first mode is configured to control the switching tube to be switched on or switched off according to a specified duty ratio, and the second mode is configured to control the switching tube to be switched on according to the power supply signal. By the technical scheme, the working efficiency of driving the load to operate is improved, and the power consumption of the circuit and the hardware loss of the switching tube are reduced.
Description
Technical Field
The present invention relates to the field of drive control, and in particular, to an operation control method, a drive control circuit, a home appliance, and a computer-readable storage medium.
Background
PFC (Power Factor Correction) technology is widely used in drive control circuits, and mainly has an effect of improving the Power consumption efficiency of electric devices (loads).
In the related art, a PWM (Pulse-Width Modulation) is usually adopted to drive a switching tube to be turned on or off, a common PFC module includes a Boost-type PFC module and a bridgeless totem-pole PFC module, and the two PFC modules have at least the following technical defects when driving a load:
(1) the circuit structure of the Boost type PFC module is simple, namely, the charging and discharging processes of the inductor are controlled through the switching tube, but the efficiency of the Boost type PFC module is low, and the switching loss is large.
(2) The efficiency of the bridgeless totem-pole PFC module is higher than that of the Boost PFC module, but the bridgeless totem-pole PFC module usually works in a high-frequency or power-frequency mode, but the high-frequency mode is only suitable for the condition of a large load, when the load is small, the conduction loss of a switching tube is increased, the efficiency is low, the hardware loss and the power consumption of a driving control circuit are high, and the energy efficiency of the load is not further 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.
To this end, it is an object of the invention to propose an operation control method.
Another object of the present invention is to provide a driving control circuit.
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 a technical solution of a first aspect of the present invention, an operation control method is provided, including: obtaining the operating parameters of the load, and comparing the magnitude relation between the operating parameters and the operating parameter threshold; and controlling the power factor correction module to work in a first mode or a second mode according to the magnitude relation between the operation parameter and the operation parameter threshold, wherein the first mode is configured to control the switching tube to be switched on or switched off according to a specified duty ratio, and the second mode is configured to control the switching tube to be switched on according to the power supply signal.
In the technical scheme, the operating parameters can reflect the operating state and the required electric quantity of the load by acquiring the operating parameters of the load, and controlling the power factor correction module to operate in a first mode or a second mode based on a magnitude relationship between the operating parameter and the operating parameter threshold, wherein the first mode is adapted to drive high load (e.g., a load amount up to 50% at full load) operation, the second mode is adapted to drive low load (e.g., a load amount not up to 50% at full load) operation, and further, because the electric quantity required by the low load is low, the state of the switch tube in the second mode comprises a working state and a non-working state, and the switch tube does not act in the non-working state, the electric quantity required by the load operation can be met, the circuit loss and the power consumption can be further reduced, and the energy efficiency of the load operation can be further improved.
The operating parameter threshold is usually determined by combining the power supply signal and the hardware characteristics of the drive control circuit, wherein the hardware characteristics mainly comprise the voltage withstanding value of the switching tube and the voltage withstanding value of the capacitive element.
Optionally, the load is a single-phase motor or a three-phase motor, the driving control circuit is connected between the load and a power grid system, the driving control circuit sequentially comprises a power factor correction module, a capacitive element and an inverter, the power factor correction module is a Boost-type PFC module or a bridgeless totem-pole PFC module, a rectifier bridge is usually arranged on an input side of the Boost-type PFC module, the bridgeless totem-pole PFC module does not need to be provided with the rectifier bridge, and when the two mainstream PFC modules are applied to the second mode, the energy efficiency of the circuit can be further improved, and meanwhile, spike signals and surge signals in the circuit can be further reduced.
In addition, the operation control method according to the above embodiment of the present invention may further have the following additional technical features:
in the above technical solution, optionally, obtaining an operating parameter of the load, and comparing a magnitude relationship between the operating parameter and an operating parameter threshold value specifically includes: detecting an operating parameter of the load at preset time intervals, wherein the operating parameter comprises at least one of the current, the power, the operating pressure and the frequency; comparing the magnitude relationship between the operating parameter and an operating parameter threshold.
In the technical scheme, the operation parameters of the load are detected according to the preset time interval, the load in driving operation can be determined to be light load or heavy load, and then the working mode of the switching tube is adjusted by comparing the size relation between the operation parameters and the operation parameters, so that the flexibility and timeliness of the adjustment of the switching tube are improved, and the efficiency of the driving control circuit is further improved.
Alternatively, the preset time interval is typically determined according to the load operating frequency.
In any of the above technical solutions, optionally, controlling the power factor correction module to operate in a first mode or a second mode according to a magnitude relationship between the operating parameter and the operating parameter threshold specifically includes: if the operating parameter is determined to be greater than or equal to the operating parameter threshold value, controlling the power factor correction module to work in the first mode; and if the operating parameter is determined to be smaller than the operating parameter threshold value, controlling the power factor correction module to work in the second mode.
In this technical solution, on one hand, it is determined that the operating parameter is greater than or equal to the operating parameter threshold, that is, the power required for operating the load is high, and therefore, the power factor correction module is controlled to operate in the first mode, that is, the switching tube operates according to the specified switching frequency, so that the reliability of the load operation can be ensured, and on the other hand, if it is determined that the operating parameter is less than the operating parameter threshold, that is, the power required for operating the load is low, the power factor correction module is controlled to operate in the second mode, and in the second mode, it is determined whether to control the switching tube to be in the operating state or the non-operating state according to the bus signal, that is, on the premise of ensuring the reliable operation of the load, the energy efficiency of the load operation is further improved.
In the above technical solution, optionally, the power factor correction module includes a bridge module, the switch tubes of each bridge arm of the bridge module are sequentially marked as a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, a common end between the first switch tube and the second switch tube is connected to a first input line of an alternating current signal, a common end between the third switch tube and the fourth switch tube is connected to a second input line of the alternating current signal, when the power supply signal is rectified by the bridge module, the alternating current signal is converted into a bus signal, a common end between the first switch tube and the fourth switch tube is connected to a high-voltage line of the bus signal, and a common end between the second switch tube and the third switch tube is connected to a low-voltage line of the bus signal.
In the technical scheme, the power factor correction module comprises a bridge module and is connected with the first switch tube, the second switch tube, the third switch tube and the fourth switch tube according to the mode, namely, the bridgeless totem-pole PFC module is formed, not only has the function of rectification, but also has the function of adjusting the power factor of the circuit, when the bridgeless totem-pole PFC module is controlled to work in the first mode or the second mode, dead time exists between the conduction time of the first switching tube and the conduction time of the second switching tube, meanwhile, dead time exists between the conduction time of the third switching tube and the conduction time of the fourth switching tube, so that spike signals generated by direct connection of the two switching tubes in the half-bridge circuit are avoided, and further, the reliability of the drive control circuit is further improved on the basis of improving the load operation energy efficiency.
In the foregoing technical solution, optionally, if it is determined that the operating parameter is greater than or equal to the operating parameter threshold, controlling the power factor correction module to operate in the first mode specifically includes: if the operating parameter is determined to be greater than or equal to the operating parameter threshold value, judging that the alternating current signal belongs to a positive half-cycle waveform or a negative half-cycle waveform; if the alternating current signal belongs to the positive half-cycle waveform, controlling the third switching tube to be conducted, and simultaneously controlling the fourth switching tube to be cut off; and if the alternating current signal belongs to the negative half-cycle waveform, controlling the fourth switching tube to be switched on, simultaneously controlling the third switching tube to be switched off, and controlling the first switching tube and the second switching tube to be alternately switched on according to a specified duty ratio in the first mode.
In the foregoing technical solution, optionally, if it is determined that the operating parameter is smaller than the operating parameter threshold, controlling the power factor correction module to operate in the second mode, specifically, the method further includes: if the operating parameter is determined to be smaller than the operating parameter threshold value, controlling the power factor correction module to work in a second mode according to a bus signal, wherein the second mode comprises a working mode and a non-working mode; under the working mode, judging whether the alternating current signal belongs to a positive half-cycle waveform or a negative half-cycle waveform; if the alternating current signal belongs to the positive half-cycle waveform, controlling the third switching tube to be conducted, and simultaneously controlling the fourth switching tube to be cut off; if the alternating current signal belongs to the negative half-cycle waveform, controlling the fourth switching tube to be conducted, simultaneously controlling the third switching tube to be cut off, and controlling the first switching tube and the second switching tube to be conducted alternately according to the bus signal in the working mode; in the non-working mode, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all in a cut-off state.
In any of the above technical solutions, optionally, the method further includes: in the working mode, judging whether the bus signal is greater than or equal to an upper limit voltage threshold value; and if the bus signal is judged to be greater than or equal to the upper limit voltage threshold value, switching from the working mode to the non-working mode.
In the technical scheme, in the working mode, the working mode is switched to the non-working mode by judging that the bus signal is greater than or equal to the upper limit voltage threshold, and the bus voltage is reduced in the non-working mode.
In any of the above technical solutions, optionally, the method further includes: in the non-working mode, judging whether the bus signal is less than or equal to the lower limit voltage threshold value; and if the bus signal is judged to be less than or equal to the lower limit voltage threshold value, switching from the non-working mode to the working mode.
In the technical scheme, in a non-working mode, the non-working mode is switched to the working mode by judging that the bus signal is less than or equal to the lower limit voltage threshold, and the bus voltage rises in the working mode so as to avoid the condition that the load cannot be driven to operate due to the bus voltage drop.
In the foregoing technical solution, optionally, the driving control circuit further includes a capacitive element, the capacitive element is connected between the power factor correction module and the load, the capacitive element includes a plurality of electrolytic capacitors connected in series and/or in parallel, or the capacitive element includes a plurality of capacitive elements connected in series and/or in parallel, and the operation control method further includes: and determining the upper limit voltage threshold according to the withstand voltage threshold of the capacitive element and the withstand voltage threshold of the switching tube.
In the technical scheme, the upper limit voltage threshold is determined according to the voltage withstanding threshold of the capacitive element and the voltage withstanding threshold of the switching tube, so that on one hand, the possibility that the capacitive element and the switching tube are broken down is reduced, on the other hand, the upper limit voltage threshold determines the switching time of the switching tube between the first mode and the second mode, and the reliability and the load operation energy efficiency of the power factor correction module are further improved.
In the above technical solution, optionally, the lower limit voltage threshold is greater than a peak value of the alternating current signal.
A second aspect of the present invention provides a drive control circuit comprising: a controller configured to execute the steps of the drive control method according to any one of the above; the power factor correction module comprises a switch tube, the switch tube is controlled by the controller, and the switch tube is configured to control a power supply signal to supply power to a load.
In this technical solution, a controller is disposed in the driving control circuit, and the controller is configured to execute the steps of the operation control method according to any one of the above technical solutions, so that the driving control circuit includes all the beneficial effects of the operation control method according to any one of the above technical solutions, and details are not repeated here.
Alternatively, the controller may be one of an MCU (Micro-programmed Control Unit), a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and an embedded device, but is not limited thereto.
A third aspect of the present invention provides a home appliance comprising: a load; the drive control circuit according to any one of the preceding claims, wherein the drive control circuit is configured to control a power supply signal to supply power to a load.
In this technical solution, the household electrical appliance includes the driving control circuit according to any one of the above technical solutions, and therefore, the household electrical appliance includes all the beneficial effects of the driving control circuit according to any one of the above technical solutions, which is not described again.
In the above technical solution, optionally, the household electrical appliance includes at least one of an air conditioner, a refrigerator, a fan, a range hood, a dust collector, and a computer host.
A fourth aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed, implements the steps of the operation control method according to any one of the above-described aspects.
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 an operational control method according to an embodiment of the invention;
FIG. 2 shows a schematic diagram of a drive control circuit according to an embodiment of the invention;
FIG. 3 shows a schematic diagram of a drive control circuit according to another embodiment of the invention;
fig. 4 shows a timing chart of an operation control method according to another embodiment of the present invention;
fig. 5 is a timing chart showing an operation control method according to another embodiment of the present invention;
fig. 6 is a timing chart illustrating an operation control method according to another embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to 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.
The first embodiment is as follows:
fig. 1 shows a flow diagram of an operation control method according to an embodiment of the invention.
As shown in fig. 1, an operation control method according to an embodiment of the present invention includes: step S102, obtaining the operation parameters of the load, and comparing the size relationship between the operation parameters and the operation parameter threshold value; and step S104, controlling the power factor correction module to work in a first mode or a second mode according to the magnitude relation between the operation parameter and the operation parameter threshold, wherein the first mode is configured to control the switching tube to be switched on or switched off according to a specified duty ratio, and the second mode is configured to control the switching tube to be switched on according to the power supply signal.
In the technical scheme, the operating parameters can reflect the operating state and the required electric quantity of the load by acquiring the operating parameters of the load, and controlling the power factor correction module to operate in a first mode or a second mode based on a magnitude relationship between the operating parameter and the operating parameter threshold, wherein the first mode is adapted to drive high load (e.g., a load amount up to 50% at full load) operation, the second mode is adapted to drive low load (e.g., a load amount not up to 50% at full load) operation, and further, because the electric quantity required by the low load is low, the state of the switch tube in the second mode comprises a working state and a non-working state, and the switch tube does not act in the non-working state, the electric quantity required by the load operation can be met, the circuit loss and the power consumption can be further reduced, and the energy efficiency of the load operation can be further improved.
The operating parameter threshold is usually determined by combining the power supply signal and the hardware characteristics of the drive control circuit, wherein the hardware characteristics mainly comprise the voltage withstanding value of the switching tube and the voltage withstanding value of the capacitive element.
Optionally, the load is a single-phase motor or a three-phase motor, the driving control circuit is connected between the load and a power grid system, the driving control circuit sequentially comprises a power factor correction module, a capacitive element and an inverter, the power factor correction module is a Boost-type PFC module or a bridgeless totem-pole PFC module, a rectifier bridge is usually arranged on an input side of the Boost-type PFC module, the bridgeless totem-pole PFC module does not need to be provided with the rectifier bridge, and when the two mainstream PFC modules are applied to the second mode, the energy efficiency of the circuit can be further improved, and meanwhile, spike signals and surge signals in the circuit can be further reduced.
In addition, the operation control method according to the above embodiment of the present invention may further have the following additional technical features:
in the above technical solution, optionally, obtaining an operating parameter of the load, and comparing a magnitude relationship between the operating parameter and an operating parameter threshold value specifically includes: detecting an operating parameter of the load at preset time intervals, wherein the operating parameter comprises at least one of the current, the power, the operating pressure and the frequency; comparing the magnitude relationship between the operating parameter and an operating parameter threshold.
In the technical scheme, the operation parameters of the load are detected according to the preset time interval, the load in driving operation can be determined to be light load or heavy load, and then the working mode of the switching tube is adjusted by comparing the size relation between the operation parameters and the operation parameters, so that the flexibility and timeliness of the adjustment of the switching tube are improved, and the efficiency of the driving control circuit is further improved.
Alternatively, the preset time interval is typically determined according to the load operating frequency.
In any of the above technical solutions, optionally, controlling the power factor correction module to operate in a first mode or a second mode according to a magnitude relationship between the operating parameter and the operating parameter threshold specifically includes: if the operating parameter is determined to be greater than or equal to the operating parameter threshold value, controlling the power factor correction module to work in the first mode; and if the operating parameter is determined to be smaller than the operating parameter threshold value, controlling the power factor correction module to work in the second mode.
In this technical solution, on one hand, it is determined that the operating parameter is greater than or equal to the operating parameter threshold, that is, the power required for operating the load is high, and therefore, the power factor correction module is controlled to operate in the first mode, that is, the switching tube operates according to the specified switching frequency, so that the reliability of the load operation can be ensured, and on the other hand, if it is determined that the operating parameter is less than the operating parameter threshold, that is, the power required for operating the load is low, the power factor correction module is controlled to operate in the second mode, and in the second mode, it is determined whether to control the switching tube to be in the operating state or the non-operating state according to the bus signal, that is, on the premise of ensuring the reliable operation of the load, the energy efficiency of the load operation is further improved.
In the above technical solution, optionally, the power factor correction module includes a bridge module, the switch tubes of each bridge arm of the bridge module are sequentially marked as a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, a common end between the first switch tube and the second switch tube is connected to a first input line of an alternating current signal, a common end between the third switch tube and the fourth switch tube is connected to a second input line of the alternating current signal, when the power supply signal is rectified by the bridge module, the alternating current signal is converted into a bus signal, a common end between the first switch tube and the fourth switch tube is connected to a high-voltage line of the bus signal, and a common end between the second switch tube and the third switch tube is connected to a low-voltage line of the bus signal.
In the technical scheme, the power factor correction module comprises a bridge module and is connected with the first switch tube, the second switch tube, the third switch tube and the fourth switch tube according to the mode, namely, the bridgeless totem-pole PFC module is formed, not only has the function of rectification, but also has the function of adjusting the power factor of the circuit, when the bridgeless totem-pole PFC module is controlled to work in the first mode or the second mode, dead time exists between the conduction time of the first switching tube and the conduction time of the second switching tube, meanwhile, dead time exists between the conduction time of the third switching tube and the conduction time of the fourth switching tube, so that spike signals generated by direct connection of the two switching tubes in the half-bridge circuit are avoided, and further, the reliability of the drive control circuit is further improved on the basis of improving the load operation energy efficiency.
In the foregoing technical solution, optionally, if it is determined that the operating parameter is greater than or equal to the operating parameter threshold, controlling the power factor correction module to operate in the first mode specifically includes: if the operating parameter is determined to be greater than or equal to the operating parameter threshold value, judging that the alternating current signal belongs to a positive half-cycle waveform or a negative half-cycle waveform; if the alternating current signal belongs to the positive half-cycle waveform, controlling the third switching tube to be conducted, and simultaneously controlling the fourth switching tube to be cut off; and if the alternating current signal belongs to the negative half-cycle waveform, controlling the fourth switching tube to be switched on, simultaneously controlling the third switching tube to be switched off, and controlling the first switching tube and the second switching tube to be alternately switched on according to a specified duty ratio in the first mode.
In the foregoing technical solution, optionally, if it is determined that the operating parameter is smaller than the operating parameter threshold, controlling the power factor correction module to operate in the second mode, specifically, the method further includes: if the operating parameter is determined to be smaller than the operating parameter threshold value, controlling the power factor correction module to work in a second mode according to a bus signal, wherein the second mode comprises a working mode and a non-working mode; under the working mode, judging whether the alternating current signal belongs to a positive half-cycle waveform or a negative half-cycle waveform; if the alternating current signal belongs to the positive half-cycle waveform, controlling the third switching tube to be conducted, and simultaneously controlling the fourth switching tube to be cut off; if the alternating current signal belongs to the negative half-cycle waveform, controlling the fourth switching tube to be conducted, simultaneously controlling the third switching tube to be cut off, and controlling the first switching tube and the second switching tube to be conducted alternately according to the bus signal in the working mode; in the non-working mode, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all in a cut-off state.
In any of the above technical solutions, optionally, the method further includes: in the working mode, judging whether the bus signal is greater than or equal to an upper limit voltage threshold value; and if the bus signal is judged to be greater than or equal to the upper limit voltage threshold value, switching from the working mode to the non-working mode.
In the technical scheme, in the working mode, the working mode is switched to the non-working mode by judging that the bus signal is greater than or equal to the upper limit voltage threshold, and the bus voltage is reduced in the non-working mode.
In any of the above technical solutions, optionally, the method further includes: in the non-working mode, judging whether the bus signal is less than or equal to the lower limit voltage threshold value; and if the bus signal is judged to be less than or equal to the lower limit voltage threshold value, switching from the non-working mode to the working mode.
In the technical scheme, in a non-working mode, the non-working mode is switched to the working mode by judging that the bus signal is less than or equal to the lower limit voltage threshold, and the bus voltage rises in the working mode so as to avoid the condition that the load cannot be driven to operate due to the bus voltage drop.
In the foregoing technical solution, optionally, the driving control circuit further includes a capacitive element, the capacitive element is connected between the power factor correction module and the load, the capacitive element includes a plurality of electrolytic capacitors connected in series and/or in parallel, or the capacitive element includes a plurality of capacitive elements connected in series and/or in parallel, and the operation control method further includes: and determining the upper limit voltage threshold according to the withstand voltage threshold of the capacitive element and the withstand voltage threshold of the switching tube.
In the technical scheme, the upper limit voltage threshold is determined according to the voltage withstanding threshold of the capacitive element and the voltage withstanding threshold of the switching tube, so that on one hand, the possibility that the capacitive element and the switching tube are broken down is reduced, on the other hand, the upper limit voltage threshold determines the switching time of the switching tube between the first mode and the second mode, and the reliability and the load operation energy efficiency of the power factor correction module are further improved.
In the above technical solution, optionally, the lower limit voltage threshold is greater than a peak value of the alternating current signal.
Fig. 2 shows a schematic diagram of a drive control circuit according to an embodiment of the invention.
As shown in fig. 2, according to the driving control circuit of an embodiment of the present invention, the driving control circuit is connected between the grid system AC and the input end of the load, and specifically includes: a bridge rectifier module, a Boost type power factor correction module, a capacitive element C (with filter characteristic) and an inverter, wherein the bridge rectifier module is used for converting an alternating current signal into a pulsating direct current signal, the Boost type power factor correction module comprises an inductive element L, a switching tube Q and a one-way conduction device D, due to the charging and discharging action of the capacitive element C, the voltage on the capacitive element C exhibits a sawtooth ripple, which, in combination with the conduction characteristic of the unidirectional conducting device D, only when the instantaneous value of the AC line voltage is higher than the voltage on the capacitive element, the one-way conduction device D is conducted due to forward bias, namely, in each period of the input signal of the AC line, the one-way conduction device D is conducted only near the peak value, the input AC voltage presents sine wave waveform, however, the input alternating current has a large number of spikes, i.e., harmonic components that cause a reduction in the power factor of the circuit.
Therefore, the Boost type power factor correction module can solve the problem of phase difference between alternating voltage and alternating current and the problems of electromagnetic interference and electromagnetic compatibility caused by harmonic signals.
Further, for the purpose of further improving the energy efficiency of the load operation, for the active Boost-type power factor correction module, the operating mode of the switching tube Q is adjusted in accordance with the operating parameters of the load, and particularly, when it is detected that the electric quantity required for driving the load to operate is low, whether the switching tube Q operates is controlled according to a power supply signal, where the power supply signal includes an AC voltage of an AC input of the power grid system and a bus voltage.
Further, if it is determined that the switching tube Q operates in the second mode, the magnitude relationship between the bus voltage and the upper limit voltage threshold and the magnitude relationship between the bus voltage and the lower limit voltage threshold are further combined to control the output of the pulse driving signal to the switching tube Q or the output of the pulse driving signal to the switching tube Q.
Still further, the switching time between the non-working mode and the working mode is the zero crossing time of the alternating current signal, so as to further reduce the spike signal in the driving control circuit.
Fig. 3 shows a schematic diagram of a drive control circuit according to another embodiment of the invention.
As shown in fig. 3, according to another embodiment of the present invention, the driving control circuit is connected between the grid system AC and the input end of the load, and specifically includes: the bridgeless totem-pole PFC module comprises an inductive element L, a switching tube and a one-way conduction device D, wherein the voltage on the capacitive element C presents sawtooth wave waves due to the charging and discharging action of the capacitive element C, and the one-way conduction device D is combined with the conduction characteristic of the one-way conduction device D, so that the one-way conduction device D is conducted due to forward bias only when the instantaneous value of the AC line voltage is higher than the voltage on the capacitive element, namely the one-way conduction device D is conducted near the peak value in each period of the AC line input signal, the input AC voltage presents sine wave shape, but the input AC current has a large number of spike pulses, namely harmonic components causing the power factor of the circuit to be low.
Therefore, the bridgeless totem-pole PFC module can solve the problem that phase difference exists between alternating-current voltage and alternating-current and the problems of electromagnetic interference and electromagnetic compatibility caused by harmonic signals, and in the embodiment, the switch tube comprises the first switch tube Q1A second switch tube Q2And a third switching tube Q3And a fourth switching tube Q4Wherein, the first switch tube Q1And a second switching tube Q2Is a high-frequency switch tube, a third switch tube Q3And a fourth switching tube Q4Is a low-frequency switching tube.
Further, for the purpose of further improving the energy efficiency of the load operation, for the active bridgeless totem-pole PFC module, the operating mode of the switching tube is adjusted according to the operating parameters of the load, and particularly, when it is detected that the electric quantity required for driving the load to operate is low, whether the switching tube operates is controlled according to a power supply signal, where the power supply signal includes an AC voltage input by the grid system and a bus voltage.
Further, if it is determined that the switching tube operates in the second mode, the magnitude relationship between the bus voltage and the upper limit voltage threshold and the magnitude relationship between the bus voltage and the lower limit voltage threshold are further combined to control the output of the pulse driving signal to the switching tube or stop the output of the pulse driving signal to the switching tube, specifically, if the bus voltage exceeds the upper limit voltage threshold, the output of the pulse driving signal to the switching tube is stopped, that is, the switching tube is in the non-operating mode, and if the bus voltage is lower than the lower limit voltage threshold, the output of the pulse driving signal to the switching tube, that is, the switching tube is in the operating mode, so that the alternating current approaches the sine wave shape.
Still further, the switching time between the non-working mode and the working mode is the zero crossing time of the alternating current signal, so as to further reduce the spike signal in the driving control circuit.
The following describes an embodiment in which the switching tube of the bridgeless totem-pole PFC module operates in the first mode or the second mode with reference to the timing diagrams shown in fig. 4 to 6.
Fig. 4 shows a timing chart of an operation control method according to another embodiment of the present invention.
As shown in fig. 4, an AC voltage U is input to a load in a grid system ACSIn the process of (1), at T0～T3In time interval, it is recorded as AC voltage USThe controller is connected to the first switch tube Q1And a second switching tube Q2A first switch tube Q for outputting pulse drive signal1The duty ratio of (1) is a variable value (increased from small to large or decreased from large), and the first switch tube Q1On-time of and the second switching tube Q2The conduction time of the third switching tube Q is complementary3On and the fourth switch tube Q4And (6) cutting off.
At T3～T6In time interval, it is recorded as AC voltage USThe controller to the first switch tube Q1And a second switching tube Q2A first switch tube Q for outputting pulse drive signal1The duty ratio of (1) is a variable value (increased from small to large or decreased from large), and the first switch tube Q1On-time of and the second switching tube Q2The conduction time of the third switching tube Q is complementary3Cut off and the fourth switch tube Q4And conducting.
Fig. 5 is a timing chart illustrating an operation control method according to another embodiment of the present invention.
As shown in fig. 5, an AC voltage U is input to a load in a grid system ACSIn the process of (1), at T0～T3In time interval, it is recorded as AC voltage USPositive half cycle waveform ofThe first switch tube Q is connected with the generator1And a second switching tube Q2A first switch tube Q for outputting pulse drive signal1The duty ratio of (1) is a preset constant value, and the first switching tube Q1On-time of and the second switching tube Q2The conduction time of the third switching tube Q is complementary3On and the fourth switch tube Q4And (6) cutting off.
At T3～T6In time interval, it is recorded as AC voltage USThe controller to the first switch tube Q1And a second switching tube Q2A first switch tube Q for outputting pulse drive signal1The duty ratio of (1) is a preset constant value, and the first switching tube Q1On-time of and the second switching tube Q2The conduction time of the third switching tube Q is complementary3Cut off and the fourth switch tube Q4And conducting.
Referring to fig. 4 and 5, if it is determined that the switching tube operates in the first mode or the second mode according to the operating parameters of the load, the pulse driving signal may be output to the switching tube according to the timing charts of fig. 4 and 5, which is beneficial to improving the power factor of the load operation while ensuring the reliable operation of the load.
As shown in fig. 6, the embodiment of the switching tube operating in the second mode with the bus voltage is specifically described as follows:
(1) setting Vdc_maxIs an upper voltage threshold, Vdc_minIs a lower voltage threshold, Vdc_minGreater than or equal to the peak value of the input alternating voltage.
(2) When the bus voltage V is detecteddcLess than Vdc_minWhen the pulse driving signal is outputted to the switching tube according to the timing chart of fig. 4 or 5, the bus voltage starts to rise, i.e., T shown in fig. 60～T3Period of time, T3～T6Period of time, T6～T9Period of time, T9～T12Period of time, T12～T15Period of time, T15～T18Time periods, i.e. three alternating voltages USThe input period of (2).
(3) When the bus voltage is detectedVdcGreater than or equal to Vdc_maxAt this time, the pulse driving signal is stopped from being outputted to the switching tube, the capacitive element supplies the electric quantity required for the load operation, and the bus voltage starts to drop, i.e., T shown in fig. 618～T21Period of time, T21～T24Period of time, T24～T27Period of time, T27～T30Time periods, i.e. two alternating voltages USThe input period of (2).
Wherein, the step (2) and the step (3) are processes of cycle condition judgment.
An embodiment of the present invention further provides a driving control circuit, including: a controller configured to perform the steps of the operation control method according to any one of the above; the power factor correction module comprises a switch tube, the switch tube is controlled by the controller, and the switch tube is configured to control a power supply signal to supply power to a load.
In this embodiment, the power supply signal is controlled by setting the switch tube to supply power to the load, so long as the bus voltage is within the normal variation range, normal operation of the load can be ensured, on the premise that normal operation of the load can be ensured, a control strategy of a burst (intermittent oscillation) mode can be set for variation of the bus voltage, that is, an intermittent output control strategy, so as to control the high-frequency action signal to be in an intermittent output state through the intermittent output control strategy, that is, the high-frequency action signal is not required to be continuously in the output state, that is, the switch tube is not required to be continuously in the high-frequency action on-off state, so that the conduction power consumption of the power factor correction module in the drive control circuit can be reduced, and the energy efficiency of an electrical apparatus (such as an air conditioner) adopting the drive control circuit can be improved.
Alternatively, the controller may be one of an MCU (Micro-programmed Control Unit), a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and an embedded device, but is not limited thereto.
An embodiment of the present invention further provides a home appliance, including: a load; the driving control circuit as described above, the driving control circuit configured to control the power supply signal to supply power to the load.
In the above technical solution, optionally, the household electrical appliance includes at least one of an air conditioner, a refrigerator, a fan, a range hood, a dust collector, and a computer host.
Embodiments of the present invention also provide a computer-readable storage medium having stored thereon a computer program which, when executed, performs the steps of the operation control method as set forth in any one of the above.
According to the technical scheme, the operation parameters of the load are obtained, the operation parameters can reflect the operation state and the required electric quantity of the load, and the power factor correction module is controlled to work in the first mode or the second mode based on the size relation between the operation parameters and the operation parameter threshold value.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
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. An operation control method is applied to a drive control circuit, the drive control circuit comprises a power factor correction module, the power factor correction module is configured to control a power supply signal to supply power to a load, the power factor correction module is provided with a switch tube, and the operation control method comprises the following steps:
obtaining the operating parameters of the load, and comparing the magnitude relation between the operating parameters and the operating parameter threshold;
controlling the power factor correction module to work in a first mode or a second mode according to the magnitude relation between the operation parameter and the operation parameter threshold,
the first mode is configured to control the switching tube to be switched on or switched off according to a specified duty ratio, and the second mode is configured to control the on state of the switching tube according to the power supply signal;
controlling the power factor correction module to work in a first mode or a second mode according to the magnitude relation between the operating parameter and the operating parameter threshold, specifically comprising:
if the operating parameter is determined to be greater than or equal to the operating parameter threshold value, controlling the power factor correction module to work in the first mode;
the power factor correction module comprises a bridge module, the switching tube of each bridge arm of the bridge module is sequentially marked as a first switching tube, a second switching tube, a third switching tube and a fourth switching tube,
a first input line of an alternating current signal is connected to a common terminal between the first switching tube and the second switching tube,
a common end between the third switching tube and the fourth switching tube is connected to a second input line of the alternating current signal;
if the operating parameter is determined to be greater than or equal to the operating parameter threshold, controlling the power factor correction module to operate in the first mode, specifically including:
if the operating parameter is determined to be greater than or equal to the operating parameter threshold value, judging that the alternating current signal belongs to a positive half-cycle waveform or a negative half-cycle waveform;
if the alternating current signal belongs to the positive half-cycle waveform, controlling the third switching tube to be conducted, and simultaneously controlling the fourth switching tube to be cut off;
if the alternating current signal belongs to the negative half-cycle waveform, controlling the fourth switching tube to be conducted, and simultaneously controlling the third switching tube to be cut off,
and under the first mode, the first switching tube and the second switching tube are controlled to be alternately conducted according to a specified duty ratio.
2. The operation control method according to claim 1, wherein obtaining the operation parameter of the load and comparing the magnitude relationship between the operation parameter and the operation parameter threshold specifically comprises:
detecting an operating parameter of the load at preset time intervals, wherein the operating parameter comprises at least one of current, power, operating pressure and frequency;
comparing the magnitude relationship between the operating parameter and an operating parameter threshold.
3. The operation control method according to claim 1 or 2, wherein controlling the power factor correction module to operate in a first mode or a second mode according to a magnitude relationship between the operation parameter and the operation parameter threshold value further comprises:
and if the operating parameter is determined to be smaller than the operating parameter threshold value, controlling the power factor correction module to work in the second mode.
4. The operation control method according to claim 3,
when the power supply signal is rectified by the bridge module, the alternating current signal is converted into a bus signal,
and a common end between the first switching tube and the fourth switching tube is connected to a high-voltage line of the bus signal, and a common end between the second switching tube and the third switching tube is connected to a low-voltage line of the bus signal.
5. The operation control method according to claim 4, wherein if it is determined that the operating parameter is smaller than the operating parameter threshold, controlling the pfc module to operate in the second mode, specifically further comprising:
if the operating parameter is determined to be smaller than the operating parameter threshold value, controlling the power factor correction module to work in a second mode according to a bus signal, wherein the second mode comprises a working mode and a non-working mode;
under the working mode, judging whether the alternating current signal belongs to a positive half-cycle waveform or a negative half-cycle waveform;
if the alternating current signal belongs to the positive half-cycle waveform, controlling the third switching tube to be conducted, and simultaneously controlling the fourth switching tube to be cut off;
if the alternating current signal belongs to the negative half-cycle waveform, controlling the fourth switching tube to be conducted, and simultaneously controlling the third switching tube to be cut off,
under the working mode, the first switch tube and the second switch tube are controlled to be alternately conducted according to the bus signal;
in the non-working mode, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all in a cut-off state.
6. The operation control method according to claim 5, characterized by further comprising:
in the working mode, judging whether the bus signal is greater than or equal to an upper limit voltage threshold value;
and if the bus signal is judged to be greater than or equal to the upper limit voltage threshold value, switching from the working mode to the non-working mode.
7. The operation control method according to claim 6, characterized by further comprising:
in the non-working mode, judging whether the bus signal is less than or equal to a lower limit voltage threshold value;
and if the bus signal is judged to be less than or equal to the lower limit voltage threshold value, switching from the non-working mode to the working mode.
8. The operation control method according to claim 6,
the drive control circuit also comprises a capacitive element, the capacitive element is connected between the power factor correction module and the load, the capacitive element comprises a plurality of electrolytic capacitors connected in series and/or in parallel, or the capacitive element comprises a plurality of capacitive elements connected in series and/or in parallel,
the operation control method further includes:
and determining the upper limit voltage threshold according to the withstand voltage threshold of the capacitive element and the withstand voltage threshold of the switching tube.
9. The operation control method according to claim 7,
the lower limit voltage threshold is greater than a peak value of the alternating current signal.
10. A drive control circuit, comprising:
a controller configured to execute the steps of the drive control method according to any one of claims 1 to 9;
the power factor correction module comprises a switch tube, the switch tube is controlled by the controller, and the switch tube is configured to control a power supply signal to supply power to a load.
11. An appliance, comprising:
a load;
the drive control circuit of claim 10, configured to control a 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 operation control method according to any one of claims 1 to 9.
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| CN201910473279.8A CN112019031B (en) | 2019-05-31 | 2019-05-31 | Operation control method, circuit, household appliance and computer readable storage medium |
| PCT/CN2019/102648 WO2020237864A1 (en) | 2019-05-31 | 2019-08-26 | Operation control method, circuit, household appliance, and computer-readable storage medium |
| JP2021570858A JP7261909B2 (en) | 2019-05-31 | 2019-08-26 | Operation control method, circuit, home appliance and computer readable storage medium |
| JP2023016656A JP2023052955A (en) | 2019-05-31 | 2023-02-07 | Operation control method, circuit, household appliance, and computer-readable storage medium |
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