CN112019027B - Drive control method, device, household appliance and computer readable storage medium - Google Patents

Drive control method, device, household appliance and computer readable storage medium Download PDF

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Publication number
CN112019027B
CN112019027B CN201910473273.0A CN201910473273A CN112019027B CN 112019027 B CN112019027 B CN 112019027B CN 201910473273 A CN201910473273 A CN 201910473273A CN 112019027 B CN112019027 B CN 112019027B
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Prior art keywords
mode
bus voltage
switching device
voltage
change rate
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CN201910473273.0A
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CN112019027A (en
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文先仕
黄招彬
曾贤杰
张杰楠
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Priority to CN201910473273.0A priority Critical patent/CN112019027B/en
Priority to PCT/CN2019/097557 priority patent/WO2020237810A1/en
Publication of CN112019027A publication Critical patent/CN112019027A/en
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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
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention provides a drive control method, a device, household electrical appliance equipment and a computer readable storage medium, wherein the drive control method comprises the following steps: detecting bus voltage, alternating voltage and alternating current corresponding to the alternating voltage in the process of supplying power to a load by a power supply signal; determining whether the switching device is currently operating in the first mode or the second mode; and controlling the switching of the working mode of the switching device according to the bus voltage, the alternating current, the alternating voltage and the current working mode of the switching device, wherein the first mode is configured as a mode for controlling the switching device to be switched off, the second mode is configured as a mode for operating the switching device according to a specified pulse driving signal, so that the given current in the second mode follows the running voltage input to the load, and the alternating voltage is converted into the bus voltage after rectification processing. By the technical scheme, the working efficiency of driving the load to operate is improved, and the power consumption of a circuit and the hardware loss are reduced.

Description

Drive control method, device, household appliance and computer readable storage medium
Technical Field
The present invention relates to the field of drive control, and in particular, to a drive control method, a drive control apparatus, 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, so that the hardware loss and the power consumption of the 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, an object of the present invention is to propose a drive control method.
Another object of the present invention is to provide a drive control apparatus.
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 an aspect of the first aspect of the present invention, a drive control method is provided, including: detecting bus voltage, alternating voltage and alternating current corresponding to the alternating voltage in the process of supplying power to the load by the power supply signal; determining whether the switching device is currently operating in a first mode or a second mode; and controlling the switching of the working mode of the switching device according to the bus voltage, the alternating current, the alternating voltage and the current working mode of the switching device, wherein the first mode is configured to control the switching device to be switched off, the second mode is configured to be a mode in which the switching device works according to a specified pulse driving signal, so that the given current in the second mode follows the running voltage input to the load, and the alternating voltage is converted into the bus voltage after being rectified.
In the technical scheme, the operation mode of the switching device is controlled to be switched according to the bus voltage, the alternating current, the alternating voltage and the current operation mode of the switching device, namely the switching device is adjusted to operate in a first mode or a second mode, the change rate of the bus voltage along with time is determined according to the bus voltage, the alternating current and the alternating voltage, the operation mode of the switching device is determined by referring to the magnitude relation between the bus voltage and a bus voltage threshold value, and the switching time is determined by combining the trend of the alternating voltage along with the time, wherein the first mode is configured to be a mode for controlling the switching device to be cut off, and in the first mode, the driving signal is stopped from being sent to the switching device so as to reduce the power consumption and the hardware loss of the switching device and the bus voltage is continuously reduced, it is also desirable to operate a second mode to boost the load and to power factor correct the load, and accordingly, the second mode is configured to operate the switching device in accordance with a prescribed pulsed drive signal such that a given current in the second mode follows the bus voltage.
The pulse driving signal includes, but is not limited to, a pulse width, a duty ratio, a switching frequency, and the like.
Further, as can be understood by those skilled in the art, normal operation of the load can be ensured in both the first mode and the second mode, that is, one switching point between the first mode and the second mode corresponds to a maximum threshold of the bus voltage, the other switching point between the first mode and the second mode corresponds to a minimum threshold of the bus voltage, and both the duration of the first mode and the duration of the second mode depend on a change rate of the bus voltage, so that on the premise of ensuring normal operation of the load, the duration of the first mode is increased as much as possible, thereby effectively reducing the operating time, the turn-on times, the hardware loss and the failure rate of the switching device.
Optionally, an alternating current signal in the power supply signal is a continuous signal, and the alternating current signal includes a positive half-cycle signal and a negative half-cycle signal that are alternately distributed, and a switching time between the first mode and the second mode is a zero-crossing time of the alternating current signal in the power supply signal, and the zero-crossing time is a transition time between the adjacent positive half-cycle signal and the adjacent negative half-cycle signal.
Optionally, a given current needs to be applied while outputting a pulse driving signal to the switching device in the second mode, and in order to reduce the impact of the given current on the circuit hardware, both the start time and the end time of the second mode are set to be zero-crossing time, that is, the duty cycle of the second mode includes an integer number of half cycles.
Optionally, switching between the first mode and the second mode is performed at a zero-crossing point of the ac voltage, so as to reduce current harmonics in the driving control circuit, which is beneficial to reducing harmonic signals, and further improves reliability and service life of the driving control circuit.
In addition, the driving control method according to the above embodiment of the present invention may further have the following additional technical features:
in any of the above technical solutions, optionally, controlling to switch the operating mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and the current operating mode of the switching device specifically includes: determining that the switching device is currently operating in the first mode or the second mode; if the switching device is judged to be operated in the second mode currently, comparing the magnitude relation between the bus voltage and a first bus voltage threshold value; and if the bus voltage is determined to be greater than the first bus voltage threshold value, controlling the switching device to switch to the first mode for working in a first preset time period after the bus voltage is compared.
In the technical scheme, the bus voltage detected in real time is judged to be greater than the first bus voltage threshold, and the first bus voltage threshold is smaller than or equal to the maximum bus voltage threshold, so that in order to avoid breakdown of a capacitive element or a switching device, the switching device is controlled to be switched to the first mode to work at a specified time, and the reliability of the driving control circuit is further improved while the power consumption of the switching device is reduced.
In any of the above technical solutions, optionally, the controlling of switching the operating mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and the current operating mode of the switching device further includes: determining that the switching device is currently operating in the first mode or the second mode; if the switching device is judged to be operated in the second mode currently, comparing the magnitude relation between the bus voltage and a second bus voltage threshold value; if the bus voltage is determined to be smaller than the second bus voltage threshold value, calculating the change rate of the bus voltage; comparing the magnitude relation between the change rate of the bus voltage and a first change rate threshold value; and if the change rate of the bus voltage is smaller than the first change rate threshold value, controlling the switching device to switch to the first mode to work at the zero-crossing point moment of the alternating-current voltage.
In the technical scheme, by judging that the bus voltage detected in real time is smaller than the second bus voltage threshold value, and the second bus voltage threshold value is smaller than or equal to the maximum bus voltage threshold value, in order to avoid breakdown of a capacitive element or a switching device, the change rate of the bus voltage is judged to be smaller than the first change rate threshold value, and the switching device is controlled to switch to the first mode to work at the zero-crossing point time of the alternating voltage, so that the power consumption of the switching device is reduced, and the reliability of a driving control circuit is further improved.
In any of the above technical solutions, optionally, the controlling of switching the operating mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and the current operating mode of the switching device further includes: determining that the switching device is currently operating in the first mode or the second mode; if the switching device is judged to be operated in the second mode currently, comparing the magnitude relation between the bus voltage and a second bus voltage threshold value; if the bus voltage is determined to be smaller than the second bus voltage threshold value, calculating the change rate of the bus voltage; comparing the magnitude relation between the change rate of the bus voltage and a first change rate threshold value; and if the change rate of the bus voltage is judged to be greater than or equal to the first change rate threshold value, controlling the switching device to switch to the first mode for working in a second preset time period after the change rate of the bus voltage is compared.
In the technical scheme, by judging that the bus voltage detected in real time is smaller than the second bus voltage threshold and the second bus voltage threshold is smaller than or equal to the maximum bus voltage threshold, the change rate of the bus voltage is judged to be larger than or equal to the first change rate threshold, in order to avoid breakdown of a capacitive element or a switching device, the switching device is controlled to be switched to the first mode to work within a second preset time period after the change rate of the bus voltage is compared, and the reliability of the driving control circuit is further improved while the power consumption of the switching device is reduced.
In any of the above technical solutions, optionally, the controlling of switching the operating mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and the current operating mode of the switching device further includes: determining that the switching device is currently operating in the first mode or the second mode; if the fact that the switching device works in the first mode currently is judged, calculating the change rate of the bus voltage; comparing the magnitude relation between the change rate of the bus voltage and a second change rate threshold value; and if the change rate of the bus voltage is judged to be greater than or equal to the second change rate threshold value, controlling the switching device to be switched to the second mode to work at the zero-crossing time of the alternating-current voltage.
In the technical scheme, if it is determined that the switching device operates in the first mode currently, the bus voltage starts to drop, and then the change rate of the bus voltage is calculated, and it is determined that the change rate of the bus voltage is greater than or equal to the second change rate threshold, which indicates that the bus voltage drops faster, therefore, in order to avoid load stalling caused by voltage drop, the switching device is controlled to switch to the second mode to operate, and the reliability and energy efficiency of the driving control circuit are further improved.
In any of the above technical solutions, optionally, the controlling of switching the operating mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and the current operating mode of the switching device further includes: determining that the switching device is currently operating in the first mode or the second mode; if the fact that the switching device works in the first mode currently is judged, calculating the change rate of the bus voltage; comparing the magnitude relation between the change rate of the bus voltage and a second change rate threshold value; and if the change rate of the bus voltage is smaller than the second change rate threshold value, controlling the switching device to switch to the second mode for working in a third preset time period after the bus voltage is compared.
In the technical scheme, if it is determined that the switching device operates in the first mode currently, the bus voltage starts to drop, the change rate of the bus voltage is further calculated, and if it is determined that the change rate of the bus voltage is smaller than the second change rate threshold, it is indicated that the bus voltage drops slowly, so that in order to avoid load stalling caused by voltage drop, the switching device is controlled to switch to the second mode to operate within a third preset time period after the bus voltage is compared, and the reliability and the energy efficiency of the driving control circuit are further improved.
In an aspect of the second aspect of the present invention, a drive control apparatus is provided, which includes a processor that implements, when executing a computer program: the steps of the driving control method according to any of the above descriptions, so that the driving control apparatus has the beneficial technical effects of any of the above driving control methods, and are not described herein again.
In an aspect of the third aspect of the present invention, a home appliance is provided, including: a load; a drive control device according to a second aspect of the present invention; the driving control circuit is controlled by the driving control device and is provided with a PFC (power factor correction), and the PFC comprises at least one switching device which is configured to control a power supply signal to supply power to a load.
In this technical solution, the home appliance includes the drive control device according to the above technical solution, so that the home appliance includes all the beneficial effects of the drive control device according to the above technical solution, and details are not repeated 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.
In an aspect of the fourth aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed, implements the steps of the drive control method according to any one of the above 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 a drive control method according to an embodiment of the invention;
FIG. 2 shows a schematic diagram of drive control currents according to one embodiment of the present invention;
FIG. 3 shows a schematic diagram of drive control currents according to one embodiment of the present invention;
FIG. 4 shows a schematic diagram of a drive control scheme according to an embodiment of the invention;
fig. 5 shows a timing chart of a drive control method according to an embodiment of the present invention;
fig. 6 shows a timing chart of a drive control method according to another embodiment of the present invention;
fig. 7 shows a timing chart of a drive 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.
As shown in fig. 1, a drive control method according to an embodiment of the present invention includes: step S102, detecting bus voltage, alternating voltage and alternating current corresponding to the alternating voltage in the process of supplying power to the load by the power supply signal; step S104, determining whether the switching device is currently operated in a first mode or a second mode; step S106, controlling to switch the operation mode of the switching device according to the bus voltage, the alternating current, the alternating voltage and the current operation mode of the switching device, where the first mode is configured to control the switching device to be turned off, and the second mode is configured to be a mode in which the switching device operates according to a specified pulse driving signal, so that a given current in the second mode follows an operation voltage input to the load, and the alternating voltage is converted into the bus voltage after being rectified.
In the technical scheme, the operation mode of the switching device is controlled to be switched according to the bus voltage, the alternating current, the alternating voltage and the current operation mode of the switching device, namely the switching device is adjusted to operate in a first mode or a second mode, the change rate of the bus voltage along with time is determined according to the bus voltage, the alternating current and the alternating voltage, the operation mode of the switching device is determined by referring to the magnitude relation between the bus voltage and a bus voltage threshold value, and the switching time is determined by combining the trend of the alternating voltage along with the time, wherein the first mode is configured to be a mode for controlling the switching device to be cut off, and in the first mode, the driving signal is stopped from being sent to the switching device so as to reduce the power consumption and the hardware loss of the switching device and the bus voltage is continuously reduced, it is also desirable to operate a second mode to boost the load and to power factor correct the load, and accordingly, the second mode is configured to operate the switching device in accordance with a prescribed pulsed drive signal such that a given current in the second mode follows the bus voltage.
The pulse driving signal includes, but is not limited to, a pulse width, a duty ratio, a switching frequency, and the like.
Further, as can be understood by those skilled in the art, normal operation of the load can be ensured in both the first mode and the second mode, that is, one switching point between the first mode and the second mode corresponds to a maximum threshold of the bus voltage, the other switching point between the first mode and the second mode corresponds to a minimum threshold of the bus voltage, and both the duration of the first mode and the duration of the second mode depend on a change rate of the bus voltage, so that on the premise of ensuring normal operation of the load, the duration of the first mode is increased as much as possible, thereby effectively reducing the operating time, the turn-on times, the hardware loss and the failure rate of the switching device.
Optionally, an alternating current signal in the power supply signal is a continuous signal, and the alternating current signal includes a positive half-cycle signal and a negative half-cycle signal that are alternately distributed, and a switching time between the first mode and the second mode is a zero-crossing time of the alternating current signal in the power supply signal, and the zero-crossing time is a transition time between the adjacent positive half-cycle signal and the adjacent negative half-cycle signal.
Optionally, a given current needs to be applied while outputting a pulse driving signal to the switching device in the second mode, and in order to reduce the impact of the given current on the circuit hardware, both the start time and the end time of the second mode are set to be zero-crossing time, that is, the duty cycle of the second mode includes an integer number of half cycles.
Optionally, switching between the first mode and the second mode is performed at a zero-crossing point of the ac voltage, so as to reduce current harmonics in the driving control circuit, which is beneficial to reducing harmonic signals, and further improves reliability and service life of the driving control circuit.
In addition, the driving control method according to the above embodiment of the present invention may further have the following additional technical features:
in any of the above technical solutions, optionally, controlling to switch the operating mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and the current operating mode of the switching device specifically includes: determining that the switching device is currently operating in the first mode or the second mode; if the switching device is judged to be operated in the second mode currently, comparing the magnitude relation between the bus voltage and a first bus voltage threshold value; and if the bus voltage is determined to be greater than the first bus voltage threshold value, controlling the switching device to switch to the first mode for working in a first preset time period after the bus voltage is compared.
In the technical scheme, the bus voltage detected in real time is judged to be greater than the first bus voltage threshold, and the first bus voltage threshold is smaller than or equal to the maximum bus voltage threshold, so that in order to avoid breakdown of a capacitive element or a switching device, the switching device is controlled to be switched to the first mode to work at a specified time, and the reliability of the driving control circuit is further improved while the power consumption of the switching device is reduced.
In any of the above technical solutions, optionally, the controlling of switching the operating mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and the current operating mode of the switching device further includes: determining that the switching device is currently operating in the first mode or the second mode; if the switching device is judged to be operated in the second mode currently, comparing the magnitude relation between the bus voltage and a second bus voltage threshold value; if the bus voltage is determined to be smaller than the second bus voltage threshold value, calculating the change rate of the bus voltage; comparing the magnitude relation between the change rate of the bus voltage and a first change rate threshold value; and if the change rate of the bus voltage is smaller than the first change rate threshold value, controlling the switching device to switch to the first mode to work at the zero-crossing point moment of the alternating-current voltage.
In the technical scheme, by judging that the bus voltage detected in real time is smaller than the second bus voltage threshold value, and the second bus voltage threshold value is smaller than or equal to the maximum bus voltage threshold value, in order to avoid breakdown of a capacitive element or a switching device, the change rate of the bus voltage is judged to be smaller than the first change rate threshold value, and the switching device is controlled to switch to the first mode to work at the zero-crossing point time of the alternating voltage, so that the power consumption of the switching device is reduced, and the reliability of a driving control circuit is further improved.
In any of the above technical solutions, optionally, the controlling of switching the operating mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and the current operating mode of the switching device further includes: determining that the switching device is currently operating in the first mode or the second mode; if the switching device is judged to be operated in the second mode currently, comparing the magnitude relation between the bus voltage and a second bus voltage threshold value; if the bus voltage is determined to be smaller than the second bus voltage threshold value, calculating the change rate of the bus voltage; comparing the magnitude relation between the change rate of the bus voltage and a first change rate threshold value; and if the change rate of the bus voltage is judged to be greater than or equal to the first change rate threshold value, controlling the switching device to switch to the first mode for working in a second preset time period after the change rate of the bus voltage is compared.
In the technical scheme, by judging that the bus voltage detected in real time is smaller than the second bus voltage threshold and the second bus voltage threshold is smaller than or equal to the maximum bus voltage threshold, the change rate of the bus voltage is judged to be larger than or equal to the first change rate threshold, in order to avoid breakdown of a capacitive element or a switching device, the switching device is controlled to be switched to the first mode to work within a second preset time period after the change rate of the bus voltage is compared, and the reliability of the driving control circuit is further improved while the power consumption of the switching device is reduced.
In any of the above technical solutions, optionally, the controlling of switching the operating mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and the current operating mode of the switching device further includes: determining that the switching device is currently operating in the first mode or the second mode; if the fact that the switching device works in the first mode currently is judged, calculating the change rate of the bus voltage; comparing the magnitude relation between the change rate of the bus voltage and a second change rate threshold value; and if the change rate of the bus voltage is judged to be greater than or equal to the second change rate threshold value, controlling the switching device to be switched to the second mode to work at the zero-crossing time of the alternating-current voltage.
In the technical scheme, if it is determined that the switching device operates in the first mode currently, the bus voltage starts to drop, and then the change rate of the bus voltage is calculated, and it is determined that the change rate of the bus voltage is greater than or equal to the second change rate threshold, which indicates that the bus voltage drops faster, therefore, in order to avoid load stalling caused by voltage drop, the switching device is controlled to switch to the second mode to operate, and the reliability and energy efficiency of the driving control circuit are further improved.
In any of the above technical solutions, optionally, the controlling of switching the operating mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and the current operating mode of the switching device further includes: determining that the switching device is currently operating in the first mode or the second mode; if the fact that the switching device works in the first mode currently is judged, calculating the change rate of the bus voltage; comparing the magnitude relation between the change rate of the bus voltage and a second change rate threshold value; and if the change rate of the bus voltage is smaller than the second change rate threshold value, controlling the switching device to switch to the second mode for working in a third preset time period after the bus voltage is compared.
In the technical scheme, if it is determined that the switching device operates in the first mode currently, the bus voltage starts to drop, the change rate of the bus voltage is further calculated, and if it is determined that the change rate of the bus voltage is smaller than the second change rate threshold, it is indicated that the bus voltage drops slowly, so that in order to avoid load stalling caused by voltage drop, the switching device is controlled to switch to the second mode to operate within a third preset time period after the bus voltage is compared, and the reliability and the energy efficiency of the driving control circuit are further improved.
Fig. 2 shows a schematic diagram of the drive control current 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 is adjusted in combination 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 operates is controlled according to a power supply signal, wherein the power supply signal includes an alternating current voltage and a bus voltage input by the power grid system AC.
Further, if it is determined that the switching tube operates in the second mode, the bus voltage is further combined with the maximum threshold V of the bus voltagedc_maxThe magnitude relation between the bus voltage and the minimum threshold value V of the bus voltagedc_minThe pulse driving signal is output to the switching tube or the pulse driving signal is stopped to be output to the switching tube.
Specifically, if the bus voltage exceeds the upper limit voltage threshold, the pulse driving signal is stopped from being output to the switching tube, namely, the switching tube is switched to the first mode operation, namely, the switching tube is in an intermittent state, and if the bus voltage is lower than the minimum threshold V of the bus voltagedc_minThen, a pulse driving signal is output to the switch tube, i.e. the switch tube is switched to a second mode to work, i.e. the switch tube is in a working state, so that a given current I is causedSClose to a sine wave waveform.
Still further, the switching time between the first mode and the second 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 the drive control current according to an 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 bus voltage is further combined with the maximum threshold V of the bus voltagedc_maxThe magnitude relation between the bus voltage and the minimum threshold value V of the bus voltagedc_minThe magnitude relation between them, in order toAnd controlling to output the pulse driving signal to the switching tube or stopping outputting the pulse driving signal to the switching tube.
Specifically, if the bus voltage exceeds the upper limit voltage threshold, the pulse driving signal is stopped from being output to the switching tube, namely, the switching tube is switched to the first mode operation, namely, the switching tube is in an intermittent state, and if the bus voltage is lower than the minimum threshold V of the bus voltagedc_minThen, a pulse driving signal is output to the switch tube, i.e. the switch tube is switched to a second mode to work, i.e. the switch tube is in a working state, so that a given current I is causedSClose to a sine wave waveform.
Still further, the switching time between the first mode and the second 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. 4 shows a schematic diagram of a drive control scheme according to an embodiment of the invention.
As shown in fig. 4, in the drive control scheme of the present embodiment, the steps performed by the PI controller include:
(1) the first PI controller is used for controlling the first PI controller according to the bus voltage VdcAnd bus voltage threshold VdcrefThe difference between them determines the rate of change and thus the gain value I for a given currentref_dcGain value and AC voltage VacThe product of (the absolute value of the ac voltage shown in fig. 4) is a given current, and the given current is subjected to current limiting processing and then output to the second PI controller.
(2) The second PI controller is used for controlling the current I according to the given current and the alternating currentacAnd calculating and determining a pulse driving signal, wherein the pulse driving signal comprises a first duty ratio, a second duty ratio, a third duty ratio and a fourth duty ratio, similarly, a dead time is set between the conduction time of the first switch tube and the conduction time between the second switch tubes, and in addition, the pulse driving signal also comprises the switching frequency of the switch tubes.
And the first PI controller and the second PI controller are proportional-integral controllers.
As shown in fig. 5 and fig. 6, 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 amount of power 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 of the AC input of the power grid system and a bus voltage.
Further, if it is determined that the switching tube operates in the second mode, the bus voltage V is further combineddcMaximum threshold V of bus voltagedc_maxThe magnitude relation between them, and the bus voltage VdcMinimum threshold V to bus voltagedc_minThe pulse driving signal is output to the switching tube or the pulse driving signal is stopped to be output to the switching tube.
Specifically, if the bus voltage VdcIf the bus voltage exceeds the upper limit voltage threshold, the pulse driving signal output to the switching tube is stopped, namely the switching tube is switched to the first mode to work, namely the switching tube is in an intermittent state, and if the bus voltage is lower than the minimum threshold V of the bus voltagedc_minThen, a pulse driving signal is output to the switch tube, i.e. the switch tube is switched to a second mode to work, i.e. the switch tube is in a working state, so that a given current I is causedSClose to a sine wave waveform.
As shown in FIG. 5, the switching time between the first mode and the second mode is the AC signal USTo further reduce harmonic signals in the drive control circuit to give a given current ISClose to a sine wave waveform.
As shown in FIG. 6, the switching time between the first mode and the second mode is not the AC signal USMay result in excessive harmonic signals in the drive control circuit, which in turn results in a given current ISThe distortion becomes large.
As shown in FIG. 7, T corresponding to a full wave zero crossing is determined based on the sampled value of the bus voltage12At the moment, the first mode is switched to the second mode according to the bus voltage VdcPredicting and sampling the bus voltage according to the time-varying rule, optionally predicting a first bus voltage prediction corresponding to a first half-wave zero crossing point after entering a second modeValue Vdc_pre1Comparing the predicted value V of the first bus voltagedc_pre1Maximum threshold V of bus voltagedc_maxIf the first bus voltage predicted value V is determineddc_pre1Less than maximum threshold value V of bus voltagedc_maxContinuing to maintain the second mode operation and according to the bus voltage sampling value V of the next full wave zero crossing pointdc_curPredicting a first bus voltage prediction value Vdc_pre2Comparing the predicted value V of the second bus voltagedc_pre2Maximum threshold V of bus voltagedc_maxIf the second bus voltage predicted value V is determineddc_pre2Maximum threshold value V close to bus voltagedc_maxI.e. maximum threshold value V of bus voltagedc_maxAnd a second bus voltage predicted value Vdc_pre2The difference value between the two full-wave zero-crossing points is smaller than the difference value threshold value, the corresponding time T of the other full-wave zero-crossing point is determined21Switching to the first mode.
A home appliance according to an embodiment of the present invention includes: a load; the drive control apparatus according to any one of the above; the driving control circuit is controlled by the driving control device and is provided with a PFC (power factor correction), and the PFC comprises at least one switching device which is configured to control a power supply signal to supply power to a load.
In this technical solution, the home appliance includes the driving control device described in any of the embodiments, so that the home appliance includes all the beneficial effects of the driving control device described in any of the embodiments, which are not described again.
In one embodiment of the present invention, optionally, the household appliance includes at least one of an air conditioner, a refrigerator, a fan, a range hood, a dust collector, and a computer mainframe.
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.
A computer-readable storage medium according to an embodiment of the present invention, has a computer program stored thereon, which, when executed, implements the steps of the drive control method according to any one of the above-described technical solutions.
By means of the technical scheme, the switching of the working mode of the switching device is controlled according to the bus voltage, the alternating current, the alternating voltage and the current working mode of the switching device, namely the switching device is adjusted to work in a first mode or work in a second mode, the change rate of the bus voltage along with time is determined according to the bus voltage, the alternating current and the alternating voltage, the working mode of the switching device is determined by referring to the size relation between the bus voltage and a bus voltage threshold, the switching time is determined by combining the trend of the alternating voltage along with the time, the first mode is configured to be a mode for controlling the switching device to be cut off, and in the first mode, the driving signal is stopped being sent to the switching device to reduce the power consumption and hardware loss of the switching device, and the bus voltage is continuously reduced, it is also desirable to operate a second mode to boost the load and to power factor correct the load, and accordingly, the second mode is configured to operate the switching device in accordance with a prescribed pulsed drive signal such that a given current in the second mode follows the bus voltage.
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 (11)

1. A drive control method for a drive control circuit having at least one switching device configured to control a supply signal to supply power to a load, the drive control method comprising:
detecting bus voltage, alternating voltage and alternating current corresponding to the alternating voltage in the process of supplying power to the load by the power supply signal;
determining whether the switching device is currently operating in a first mode or a second mode;
controlling switching of an operation mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and a current operation mode of the switching device,
wherein the first mode is configured as a mode in which the switching device is controlled to be turned off, the second mode is configured as a mode in which the switching device operates according to a specified pulse driving signal, so that a given current in the second mode follows an operating voltage input to the load, and the alternating-current voltage is converted into the bus voltage after being rectified;
controlling the switching of the working mode of the switching device according to the bus voltage, the alternating current, the alternating voltage and the current working mode of the switching device, and specifically further comprising:
determining that the switching device is currently operating in the first mode or the second mode;
if the switching device is judged to be operated in the second mode currently, comparing the magnitude relation between the bus voltage and a second bus voltage threshold value;
if the bus voltage is determined to be smaller than the second bus voltage threshold value, calculating the change rate of the bus voltage;
comparing the magnitude relation between the change rate of the bus voltage and a first change rate threshold value;
and if the change rate of the bus voltage is smaller than the first change rate threshold value, controlling the switching device to switch to the first mode to work at the zero-crossing point moment of the alternating-current voltage.
2. The drive control method according to claim 1, wherein controlling switching of the operation mode of the switching device according to the bus voltage, the alternating current, the alternating voltage, and the current operation mode of the switching device specifically includes:
determining that the switching device is currently operating in the first mode or the second mode;
if the switching device is judged to be operated in the second mode currently, comparing the magnitude relation between the bus voltage and a first bus voltage threshold value;
and if the bus voltage is determined to be greater than the first bus voltage threshold value, controlling the switching device to switch to the first mode for working in a first preset time period after the bus voltage is compared.
3. The drive control method according to claim 1, wherein switching of the operation mode of the switching device is controlled according to the bus voltage, the alternating current, the alternating voltage, and a current operation mode of the switching device, and specifically further comprising:
determining that the switching device is currently operating in the first mode or the second mode;
if the switching device is judged to be operated in the second mode currently, comparing the magnitude relation between the bus voltage and a second bus voltage threshold value;
if the bus voltage is determined to be smaller than the second bus voltage threshold value, calculating the change rate of the bus voltage;
comparing the magnitude relation between the change rate of the bus voltage and a first change rate threshold value;
and if the change rate of the bus voltage is judged to be greater than or equal to the first change rate threshold value, controlling the switching device to switch to the first mode for working in a second preset time period after the change rate of the bus voltage is compared.
4. The drive control method according to claim 1, wherein switching of the operation mode of the switching device is controlled according to the bus voltage, the alternating current, the alternating voltage, and a current operation mode of the switching device, and specifically further comprising:
determining that the switching device is currently operating in the first mode or the second mode;
if the fact that the switching device works in the first mode currently is judged, calculating the change rate of the bus voltage;
comparing the magnitude relation between the change rate of the bus voltage and a second change rate threshold value;
and if the change rate of the bus voltage is judged to be greater than or equal to the second change rate threshold value, controlling the switching device to be switched to the second mode to work at the zero-crossing time of the alternating-current voltage.
5. The drive control method according to claim 1, wherein switching of the operation mode of the switching device is controlled according to the bus voltage, the alternating current, the alternating voltage, and a current operation mode of the switching device, and specifically further comprising:
determining that the switching device is currently operating in the first mode or the second mode;
if the fact that the switching device works in the first mode currently is judged, calculating the change rate of the bus voltage;
comparing the magnitude relation between the change rate of the bus voltage and a second change rate threshold value;
and if the change rate of the bus voltage is smaller than the second change rate threshold value, controlling the switching device to switch to the second mode for working in a third preset time period after the bus voltage is compared.
6. The drive control method according to any one of claims 1 to 5, characterized by further comprising:
detecting the current of the load, and calculating and determining the power of the load according to the current of the load;
determining the input power of the load corresponding to the given current in the second mode;
calculating a difference between the input power and a power of the load, the difference configured as a charging power;
determining the change rate of the bus voltage according to the charging power;
determining a minimum value for a given current in the second mode based on the rate of change of the bus voltage,
wherein the given current is configured to control the bus voltage to rise.
7. The drive control method according to claim 2,
the driving control circuit further comprises a capacitive element, the capacitive element is connected between the switching device 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 thin film capacitors connected in series and/or in parallel,
the drive control method further includes:
and determining the voltage threshold of the first bus according to the voltage threshold of the capacitive element and the voltage threshold of the switching device.
8. A drive control apparatus comprising a processor, wherein the processor when executing a computer program implements:
the steps of the drive control method according to any one of claims 1 to 7.
9. An appliance, comprising:
a load;
the drive control apparatus according to claim 8;
the driving control circuit is controlled by the driving control device and is provided with at least one switching device which is configured to control a power supply signal to supply power to a load.
10. The home device of claim 9,
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.
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 drive control method according to any one of claims 1 to 7.
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