CN112019022A

CN112019022A - Operation control method, device, circuit, household appliance and computer storage medium

Info

Publication number: CN112019022A
Application number: CN201910472259.9A
Authority: CN
Inventors: 胡斌; 曾贤杰; 文先仕
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2020-12-01
Anticipated expiration: 2039-05-31
Also published as: CN112019022B

Abstract

The invention provides an operation control method, an operation control device, a circuit, household electrical appliance equipment and a computer storage medium, wherein the operation control method comprises the following steps: and if the fact that the duration of the action signal in the state meets a preset switching condition when the alternating current power supply signal reaches any zero crossing point is detected, switching the state of the action signal at the zero crossing point, wherein the state of the action signal comprises an output state and a stop output state. According to the technical scheme, the action signal is output in the intermittent oscillation mode, so that the conduction power consumption of a PFC switch module in the drive control circuit is reduced, the stability of switching operation can be improved by executing switching operation of an output state at a zero crossing point, the energy of an energy storage inductor on an output flow path can be effectively released when the action signal is stopped to be output, and the impact on a switch device is prevented.

Description

Operation control method, device, circuit, household appliance and computer storage medium

Technical Field

The present invention relates to the field of drive control, and in particular, to an operation control method, an operation control device, a drive control circuit, a home appliance, and a computer-readable storage medium.

Background

The active PFC (Power Factor Correction) technology has the advantages of high Power Factor, small harmonic current, stable output voltage, and the like, and thus is widely applied, and in the related art, a boost PFC circuit structure is adopted, and a continuous PWM (pulse width modulation) output control switch unit is used to implement a boost operation so as to make the phases of an input current and an input voltage consistent, but the active PFC (Power Factor Correction) technology has the following defects in the application process:

the scheme for realizing PFC control through continuous PWM output has a very low power factor at low load, and as the load decreases, the proportion of the total power occupied by the conduction loss increases, which ultimately results in low operating efficiency.

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 an operation control device.

It is a further object of the present invention to provide a drive 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 an aspect of the first aspect of the present invention, the driving control circuit includes a power factor correction module, where the power factor correction module includes a switching device, and controls an ac power supply signal to supply power to a load by outputting an action signal to the switching device, and the operation control method includes: the alternating current power supply signal reaches any zero crossing point, the duration of the action signal in the current state meets a preset switching condition, and state switching operation is executed at the zero crossing point, wherein the state of the action signal comprises an output state and a stop output state, the bus voltage is in an ascending trend in the output state, the switching tube stops switching action in the stop output state, and the bus voltage is in a descending trend.

In the operation control method suitable for the driving control circuit provided by the invention, when an action signal is in an output state or in a stop output state, the continuous duration of the current state and the state of a corresponding alternating current power supply signal are respectively detected, if a zero crossing point of the alternating current power supply signal and the corresponding continuous duration of the current state meet a preset switching condition, the switching operation of the action signal is executed at the zero crossing point, so that after the action signal is in the output state for a period of time, the action signal is switched to the stop output state at a certain zero crossing point of the alternating current power supply signal and is maintained for a period of time to complete one operation period of an intermittent oscillation mode, on one hand, by realizing the output of the action signal in the intermittent oscillation mode, the conduction power consumption of a PFC switch module in the driving control circuit can be reduced, so as to improve the energy efficiency of an electrical appliance (such as an air conditioner) adopting the driving, on the other hand, the switching of the regularity of the action signals in the intermittent oscillation mode can be realized, on the other hand, the switching operation of the output state is executed at the zero crossing point, so that the stability of the switching operation can be improved, and when the action signals are stopped to be output, the energy of the energy storage inductor on the output flow path can be effectively released, and the impact on the switch device is prevented.

The preset switching condition is specifically a temporal condition, and the action signal is specifically a pulse width modulation signal (i.e., a PWM signal).

Specifically, the switch tube may preferably be an IGBT (Insulated Gate Bipolar Transistor) type power tube, or may also be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), and the MOSFET specifically includes a SiC-MOSFET and a GaN-MOSFET device.

As will be understood by those skilled in the art, the intermittent oscillation mode, which may be referred to as an intermittent oscillation mode, may also be referred to as a controllable pulse mode or a skip cycle control mode, in which the output pulse of the PWM is periodically operated (i.e., the PWM is in an output state) or stopped (i.e., the PWM is in a stop output state), so as to increase the duty ratio at a constant frequency to improve the operating efficiency of the load by reducing the switching times.

The operation control method according to the above embodiment of the present invention may further have the following additional technical features:

in the foregoing technical solution, optionally, the alternating-current power supply signal reaches any zero crossing point, a duration of the action signal in the current state satisfies a preset switching condition, and a state switching operation is performed at the zero crossing point, which specifically includes: if the action signal is in an output state, recording a first duration of the output state; when the alternating current power supply signal reaches any zero crossing point and the first time length meets a first preset switching condition, stopping outputting the action signal at the current zero crossing point; if the action signal is in the output stopping state, recording a second duration of the output stopping state; and when the alternating current power supply signal reaches any zero crossing point and the second time length meets a second preset switching condition, starting to output the action signal at the current zero crossing point.

In the technical scheme, the accurate switching of the zero crossing point is realized by respectively setting a first preset switching condition and a second preset switching condition, switching from the output state to the output stop state and switching from the output stop state to the output state respectively corresponding to the action signal, when the first time length is detected to meet the first preset switching condition, switching from the output state to the output stop state, and when the second time length is detected to meet the second preset switching condition, switching from the output stop state to the output state.

In any one of the above technical solutions, optionally, when the ac power supply signal reaches any zero crossing point, and the first duration meets a first preset switching condition, the outputting of the action signal at the current zero crossing point is stopped, specifically including: if the alternating current power supply signal is detected to reach the zero crossing point, calculating the sum of the first time length and the alternating current half-wave time length to be experienced, and determining the sum as the sum of the first time length; judging whether the sum of the first duration is greater than a first maximum duration; and if the sum of the first time length is judged to be larger than the first maximum duration, controlling to stop outputting the action signal.

In the technical scheme, an alternating current power supply signal is detected, whether a zero crossing point of a half wave (a positive half cycle or a negative half cycle of the alternating current signal is defined as a half wave) of the alternating current power supply signal is reached is judged, when the alternating current power supply signal reaches the zero crossing point of the half wave, whether the zero crossing point time of the next half wave of the alternating current power supply signal is greater than the first maximum duration of the output state of PWM (pulse width modulation), and when the zero crossing point time of the next half wave of the alternating current power supply signal is greater than the first maximum duration of the output state of PWM, the PWM output is closed, so that switching operation from starting output to stopping output is completed, and the conduction loss of a switching device is reduced by entering.

In any of the foregoing technical solutions, optionally, if it is detected that the ac power supply signal reaches a zero crossing point, detecting whether a sum of the first time length and a first time length of an ac half-wave duration to be experienced is greater than the first maximum duration specifically includes: if the alternating current power supply signal is detected to reach the zero crossing point, counting the number of half waves experienced by the alternating current power supply signal in the output state; and if the number of the half waves is detected to be an even number, detecting whether the sum of the first duration is greater than the first maximum duration.

In the technical scheme, the alternating current power supply signal is detected, and whether the zero crossing point of the half-wave of the alternating current power supply signal is reached is judged. When the alternating current power supply signal reaches the zero crossing point of the half wave, judging whether the current half wave is the even number half wave in the duration time of the PWM output current starting state, and when the current half wave of the alternating current power supply signal is the even number half wave in the duration time of the PWM output current starting state, predicting whether the zero crossing point time of the next half wave of the alternating current power supply signal is larger than the maximum duration time of the PWM in the output state. And when the zero crossing time of the next half-wave of the alternating current power supply signal is longer than the maximum duration time of the PWM in the output state, the PWM output is closed, and the number of the positive half-wave and the negative half-wave is ensured to be the same through the detection of the number of the even half-waves, so that the generation of direct current components can be prevented.

In any of the above technical solutions, optionally, the method further includes: determining the rising rate of the bus voltage in the drive control circuit in the output state according to the input power of the alternating current power supply signal and the running power consumption of the load; determining the first maximum duration according to the rise rate.

In the technical scheme, the operation power consumption of the load is detected, the rising rate of the bus voltage when the PWM of a power factor correction module (PFC module) is in an output state is determined according to the operation power consumption of the load, and then a first maximum duration corresponding to the output state of the PWM of the PFC module is determined, the first maximum duration represents the maximum duration which can ensure the normal operation of the load in the output state and the output stop state of the PWM signal, in the output state, the load is powered through a power supply signal or the load is powered through a bus capacitor, an alternating current power supply signal is detected, and whether the PWM output state of the PFC is switched or not is determined at the zero crossing point of the alternating current power supply signal.

In the output state, the method can be further divided into two working modes: the two working modes are switched by high-frequency switching actions of a switching device in the PFC switch module, and when a PWM signal is in an output state, the voltage of a bus is in a rising trend as a whole.

In addition, as can also be understood by those skilled in the art, the collected operation power consumptions of different loads are different, but no matter any type of load, when the driving control circuit in the present application is used as the driving control circuit, since all the electric energy is converted into energy in other forms (such as mechanical energy), as a simpler collection way, the current of the load is used as the operation power consumption to calculate the change rate of the bus voltage in the current operation power consumption detection period, so that more real-time feedback can be obtained.

In any of the above technical solutions, optionally, the method further includes: detecting whether the rate of rise is less than a first rate threshold; if the rising rate is less than the first rate threshold, adjusting the duty cycle of the action signal to increase in the next half-wave period of the AC power supply signal to increase the rising rate to be greater than or equal to the first rate threshold.

The first speed threshold value represents a lower limit rising speed which can meet the power supply capacity to the load and the power supply capacity to the bus capacitor when the PWM signal is in an output state, namely when the first speed threshold value is larger than or equal to the first speed threshold value, the normal realization of the intermittent oscillation mode can be ensured.

In the technical scheme, if the rising rate is detected to be smaller than a first rate threshold value, the change rate of the current bus voltage cannot meet the normal power supply requirement for the load, the energy storage inductor and the bus capacitor, and the rising rate is increased by increasing the duty ratio so as to meet the power supply requirement.

In any of the above technical solutions, optionally, the method further includes: and after the duty ratio is increased in the next half-wave period of the alternating current power supply signal, acquiring the adjusted operation power consumption of the load in the next half-wave period so as to update the first maximum duration according to the adjusted operation power consumption.

According to the technical scheme, after the duty ratio is increased, the operation power consumption is collected again, the first maximum duration is updated according to the operation power consumption, and whether the zero-crossing switching point in the intermittent oscillation mode is determined again or not is determined according to the updated first maximum duration.

In any of the above technical solutions, optionally, the method further includes: if the rising rate is greater than or equal to the first rate threshold, detecting whether the rising rate is greater than a second rate threshold; if the rising rate is larger than the second rate threshold, adjusting the duty ratio of the action signal to be reduced in the next half-wave period of the alternating current power supply signal; detecting whether the adjusted duty ratio is smaller than a duty ratio lower limit threshold value; and if the duty ratio is smaller than the lower duty ratio threshold, determining the lower duty ratio threshold as the actual duty ratio of the action signal, wherein the second speed threshold is larger than the first speed threshold.

In the technical scheme, a second rate threshold is adopted to represent whether excessive energy consumption occurs, namely if the current rising rate is greater than the second rate threshold, the load is smaller, the proportion of the total power occupied by the conduction loss exceeds the specified proportion, namely, larger conduction loss occurs, and at the moment, the effect of reducing the conduction loss is achieved by reducing the duty ratio.

Further, after the duty ratio is controlled to be reduced, the duty ratio needs to be prevented from being too low, so that the duty ratio lower limit threshold is combined with the duty ratio lower limit threshold, the first rate threshold and the second rate threshold, and the purpose of reducing the conduction power consumption of the switching device is achieved while the normal power supply of the load is ensured.

In any of the above technical solutions, optionally, the method further includes: and after controlling to reduce the duty ratio, acquiring the adjusted running power consumption of the load so as to update the first maximum duration according to the adjusted running power consumption.

According to the technical scheme, after the duty ratio is reduced, the operation power consumption is collected again, the first maximum duration is updated according to the operation power consumption, and whether the zero-crossing switching point in the intermittent oscillation mode is determined again or not is determined according to the updated first maximum duration.

Specifically, the method comprises the steps of detecting the running power consumption of a load, calculating the rate v of bus voltage rising when the PWM of a PFC module is in an output state, increasing the duty ratio D of the PWM output by delta D1 when v is smaller than a first rate threshold value v1, re-detecting the running power consumption of the load, calculating the rate v of bus voltage rising when the PWM of the PFC module is in the output state until v is larger than or equal to a first rate threshold value v1, reducing the duty ratio D of the PWM output by delta D2 when v is larger than a second rate threshold value v2, re-detecting the running power consumption of the load, calculating the rate v of bus voltage rising when the PWM of the PFC module is in the output state until v is smaller than or equal to a second rate threshold value v 2.

Wherein the first speed threshold v1 and the second speed threshold v2 are respectively the minimum value and the maximum value of a reasonable range of rates of rise of the bus voltage when the PWM of the PFC is in the output state. When the duty ratio D of the PWM output is less than or equal to the lower limit threshold value D of the duty ratio_minThen, the duty ratio D of the PWM output is taken as the lower limit threshold value D of the duty ratio_min。

In any of the above technical solutions, optionally, if the ac power supply signal reaches any zero crossing point, and the second duration meets a second preset switching condition, the output of the action signal is started at the current zero crossing point, specifically including: if the alternating current power supply signal is detected to reach the zero crossing point, calculating the sum of the second time length and the alternating current half-wave time length to be experienced, and determining the sum as the sum of the second time length; judging whether the sum of the second duration is greater than a second maximum duration; and if the sum of the second duration is judged to be greater than the second maximum duration, determining that the second maximum duration meets the second preset switching condition, and controlling to start outputting the action signal.

In the technical scheme, an alternating current power supply signal is detected, whether the zero crossing point of a half wave of the alternating current power supply signal is reached is judged, when the alternating current power supply signal reaches the zero crossing point of the half wave, whether the zero crossing point time of the next half wave of the alternating current power supply signal is larger than the maximum duration time of the PWM in the output stopping state or not is predicted, and when the zero crossing point time of the next half wave of the alternating current power supply signal is larger than the maximum duration time of the PWM in the output stopping state, the PWM output is started, so that the starting output of the PWM signal.

In any of the above technical solutions, optionally, the method further includes: determining the reduction rate of the bus voltage in the drive control circuit in the output stopping state according to the running power consumption of the load; determining the second maximum duration based on the rate of decline.

In the technical scheme, the operation power consumption of the load is detected, the rising rate of the bus voltage when the PWM of the PFC is in an output state and the falling rate of the bus voltage when the PWM of the PFC is in an output stop state are determined according to the operation power consumption of the load, the first maximum duration time when the PWM of the PFC is in the output state and the second maximum duration time when the PWM of the PFC is in the off state are further determined, the alternating current power supply signal is detected, whether the PWM output state of the PFC is switched or not is determined at the zero crossing point of the alternating current power supply signal, the first maximum duration time is set to ensure that the PFC module is in the off-state in the operation stop process, namely the power supply signal and the load are equivalently in the off state, and the normal execution of the power supply of the load is realized.

In any one of the above technical solutions, optionally, the load is a compressor, the operation power consumption of the load is a three-phase current of the compressor, a bus capacitor is disposed in the driving control circuit, and the voltage across the bus capacitor is determined as the bus voltage, further including: determining the running power consumption of the compressor according to the three-phase current; determining the change rate of the bus voltage according to the running power consumption, wherein the change rate comprises a rising rate and a falling rate, if the pulse width modulation signal is in an output state, the load is powered through the alternating current power supply signal or the bus capacitor, the bus voltage is wholly in the rising state, the change rate is the rising rate, if the pulse width modulation signal enters an output stop state, the load is powered through the bus capacitor, the bus voltage is in the falling state, and the change rate is the falling rate.

In this solution, the detection of the compressor line current is performed by providing a current sensor to determine the operating power consumption of the load based on the detected current value, thereby determining the rate of change of the bus voltage based on the operating power consumption.

In the technical solution of the second aspect of the present invention, an operation control device is provided, where the operation control device may specifically include a processor and a current sensor, the current sensor collects a current of the load, and applies the current as an operation power consumption to a calculation of a change rate of a bus voltage, and when the processor executes a computer program, the operation control method according to any one of the above embodiments can be implemented, so that the operation control device has the beneficial technical effects of any one of the above operation control methods, and details thereof are not repeated here.

In an aspect of the third aspect of the present invention, a drive control circuit is provided, where the drive control circuit is configured to supply a load with a power supply signal input from a power grid system, and the drive control circuit is connected to any one of the operation control devices, and the drive control circuit includes: a power factor correction module comprising a switching device; the driving module is electrically connected with the power factor correction module and used for outputting a pulse width modulation signal to the switching device so as to enable the power factor correction module to execute power factor correction operation; the operation control device according to the second aspect of the present application is electrically connected to the driving module and the load, respectively, and the operation control device is configured to: the alternating current power supply signal reaches any zero crossing point, the duration of the action signal in the current state meets a preset switching condition, and state switching operation is executed at the zero crossing point, wherein the state of the action signal comprises an output state and a stop output state, the bus voltage is in an ascending trend in the output state, the switching tube stops switching action in the stop output state, and the bus voltage is in a descending trend.

In the operation control circuit suitable for the driving control circuit provided by the invention, when an action signal is in an output state or in a stop output state, the continuous duration of the current state and the state of a corresponding alternating current power supply signal are respectively detected, if a zero crossing point of the alternating current power supply signal and the corresponding continuous duration of the current state meet a preset switching condition, the switching operation of the action signal is executed at the zero crossing point, so that after the action signal is in the output state for a period of time, the output state is switched to a stop output state at a certain zero crossing point of the alternating current power supply signal, and a period of time is maintained to complete one operation period of an intermittent oscillation mode, on one hand, by realizing the output of the action signal in the intermittent oscillation mode, the conduction power consumption of a PFC switch module in the driving control circuit can be reduced, so as to improve the energy efficiency of an electrical appliance (such as an air conditioner) adopting the driving control, on the other hand, the switching of the regularity of the action signals in the intermittent oscillation mode can be realized, on the other hand, the switching operation of the output state is executed at the zero crossing point, so that the stability of the switching operation can be improved, and when the action signals are stopped to be output, the energy of the energy storage inductor on the output flow path can be effectively released, and the impact on the switch device is prevented.

In the foregoing technical solution, optionally, the driving control circuit further includes: the bus capacitor is arranged at the output end of the power factor correction module; the power factor correction module includes: the energy storage inductor is connected in series between the power supply source and the bus capacitor, the power supply source is used for generating the alternating current power supply signal, if the pulse width modulation signal is in an output state, the energy storage inductor, the bus capacitor and the load are powered through the alternating current power supply signal, or the energy storage inductor is charged through the alternating current power supply signal, the load is powered through the bus capacitor, and if the pulse width modulation signal is in a stop output state, the load is powered through the bus capacitor.

In this technical scheme, be provided with energy storage inductance and bus capacitor in the active PFC circuit, bus voltage is the voltage at bus capacitor both ends, when PWM signal is in output state, can also further divide into two kinds of mode: the switching between the two working modes is realized by high-frequency switching action of a switching device in a PFC (power factor correction) switching module, when a PWM (pulse width modulation) signal is in an output state, the voltage of a bus is in an increasing trend, when the PWM signal is in a stop output state, the power supply signal and the load are equivalently in a cut-off state, the load is supplied with power through the bus capacitor, and the voltage of the bus is in a decreasing trend due to the discharge of the bus capacitor.

A fourth aspect of the present invention provides a home appliance comprising: a load; the drive control circuit of any preceding claim, interposed between a grid system and a load, the drive control circuit configured to control the grid system to supply power to the load.

In this technical solution, the home appliance includes the driving control circuit described in any one of the above technical solutions, so that the home appliance includes all the beneficial effects of the driving control circuit described in any one of the above technical solutions, and details are not repeated again.

In the above technical solution, 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 fifth aspect of the invention provides a computer-readable storage medium having stored thereon a computer program which, when executed, carries out the steps of the operation control method as claimed in any one of the preceding claims.

In this technical solution, a computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the operation control method in any one of the above technical solutions, so that the computer-readable storage medium includes all beneficial effects of the operation control method in any one of the above technical solutions, and is not described again.

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 flow diagram of an operational control method according to another embodiment of the present invention;

FIG. 3 shows a flow diagram of an operation control method according to yet another embodiment of the present invention;

FIG. 4 shows a flow diagram of an operation control method according to yet another embodiment of the present invention;

FIG. 5 shows a flow diagram of an operation control method according to yet another embodiment of the present invention;

FIG. 6 shows a flow chart diagram of an operation control method according to yet another embodiment of the present invention;

FIG. 7 shows a schematic block diagram of an operation control apparatus according to yet another embodiment of the present invention;

FIG. 8 shows a schematic diagram of a drive control circuit according to an embodiment of the invention;

FIG. 9 shows a schematic diagram of the drive control circuit of FIG. 8 in a first output mode;

FIG. 10 shows a schematic diagram of the drive control circuit of FIG. 8 in a second output mode;

fig. 11 shows a schematic diagram of the drive control circuit in fig. 8 not in the output mode.

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 to the specific embodiments disclosed below.

Example one

As shown in fig. 1, according to an operation control method of an embodiment of the present invention, the driving control circuit includes a power factor correction module including a switching device to control an ac power supply signal to supply power to a load by outputting an action signal to the switching device, and the operation control method includes:

102, the alternating current power supply signal reaches any zero crossing point, the duration of the action signal in the current state meets a preset switching condition, and state switching operation is executed at the zero crossing point, wherein the state of the action signal comprises an output state and an output stopping state, the bus voltage is in an ascending trend in the output state, the switching tube stops switching action in the output stopping state, and the bus voltage is in a descending trend.

Specifically, the switch tube may preferably be an IGBT (Insulated Gate Bipolar Transistor) type power tube, or may also be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), and the MOSFET specifically includes SiC and GaN devices.

Specifically, if it is detected that the duration of the action signal in the state meets a preset switching condition when the alternating current power supply signal reaches any zero crossing point, switching the state of the action signal at the zero crossing point specifically includes: if the action signal is in the output state, recording a first duration of the output state; if the first time length meets a first preset switching condition when the alternating current power supply signal reaches any zero crossing point is detected, stopping outputting the action signal at the current zero crossing point; if the action signal is in the output stopping state, recording a second duration of the output stopping state; and if the second time length meets a second preset switching condition when the alternating current power supply signal reaches any zero crossing point, starting to output the action signal at the current zero crossing point.

In this embodiment, the switching from the output to the output stop state and the switching from the output stop state to the output state, respectively, corresponding to the action signal, are performed by setting a first preset switching condition and a second preset switching condition, respectively, to switch from the output to the output stop state when it is detected that the first duration satisfies the first preset switching condition and to switch from the output stop state to the output state when it is detected that the second duration satisfies the second preset switching condition, to achieve the accurate switching of the zero-crossing point.

Example two

Fig. 2 shows a schematic flow chart of an operation control method of another embodiment of the present invention.

As shown in fig. 2, an operation control method according to another embodiment of the present invention includes:

step 202, detecting the running power consumption of a load;

step 204, determining the rising rate of the bus voltage in the drive control circuit in the output state according to the running power consumption of the load;

step 206, determining a first maximum duration according to the rising rate, and using the first maximum duration as a first preset switching condition;

step 208, determining the reduction rate of the bus voltage in the drive control circuit in the output stopping state according to the running power consumption of the load;

step 210, determining a second maximum duration according to the decreasing rate, and using the second maximum duration as a second preset switching condition,

step 212, a zero-crossing switching point is determined according to the first maximum duration or the second maximum duration.

In the embodiment, the operation power consumption of the load is detected, the rising rate of the bus voltage when the PWM of the power factor correction module (PFC module) is in the output state is determined according to the operation power consumption of the load, and then a first maximum duration corresponding to the output state of the PWM of the PFC module is determined, where the first maximum duration represents a maximum duration that the normal operation of the load can be guaranteed by the output state and the output stop state of the PWM signal, and in the output state, the load is powered by a power supply signal or by a bus capacitor, an alternating current power supply signal is detected, and whether to switch the PWM output state of the PFC is determined at a zero crossing point of the alternating current power supply signal.

In the embodiment, the running power consumption of the load is detected, the rising rate of the bus voltage when the PWM of the PFC is in an output state and the falling rate of the bus voltage when the PWM of the PFC is in an output stop state are determined according to the running power consumption of the load, the first maximum duration of the output state and the second maximum duration of the off state of the PWM of the PFC are further determined, the alternating current power supply signal is detected, whether the PWM output state of the PFC is switched or not is determined at the zero crossing point of the alternating current power supply signal, the first maximum duration is set, the PFC module is guaranteed to be in the cut-off state in the running stop process, namely the power supply signal and the load are equivalent to be in the cut-off state, and the normal execution of the power supply to the load is realized through the bus capacitor.

EXAMPLE III

Fig. 3 shows a schematic flow chart of an operation control method of still another embodiment of the present invention.

As shown in fig. 3, an operation control method according to still another embodiment of the present invention includes:

step 302, if the alternating current power supply signal is detected to reach the zero crossing point, calculating the sum of the first time length and the alternating current half-wave time length to be experienced, and determining the sum as the sum of the first time length;

step 304, judging whether the sum of the first duration is greater than a first maximum duration;

step 306, if it is determined that the sum of the first duration is greater than the first maximum duration, controlling to stop outputting the action signal.

In the embodiment, the alternating current power supply signal is detected, whether a zero crossing point of a half wave (a positive half cycle or a negative half cycle of the alternating current signal is defined as a half wave) of the alternating current power supply signal is reached is judged, when the alternating current power supply signal reaches the zero crossing point of the half wave, whether the zero crossing point time of the next half wave of the alternating current power supply signal is greater than the first maximum duration time of the PWM in the output state is predicted, when the zero crossing point time of the next half wave of the alternating current power supply signal is greater than the first maximum duration time of the PWM in the output state, the PWM output is closed, switching operation from starting output to stopping output is completed, and conduction loss of a switching device is reduced by entering an.

Example four

Fig. 4 shows a schematic flow chart of an operation control method of still another embodiment of the present invention.

As shown in fig. 4, an operation control method according to still another embodiment of the present invention includes:

step 402, counting the number of half-waves experienced by the alternating current power supply signal in the output state if the alternating current power supply signal is detected to reach the zero crossing point;

step 404, if it is detected that the number of the half-waves is an even number, detecting whether the sum of the first duration is greater than the first maximum duration;

step 406, if it is detected that the sum of the first duration is greater than the first maximum duration, controlling to stop outputting the action signal.

In this embodiment, the ac power supply signal is detected to determine whether a zero crossing point of a half-wave of the ac power supply signal is reached. When the alternating current power supply signal reaches the zero crossing point of the half wave, judging whether the current half wave is the even number half wave in the duration time of the PWM output current starting state, and when the current half wave of the alternating current power supply signal is the even number half wave in the duration time of the PWM output current starting state, predicting whether the zero crossing point time of the next half wave of the alternating current power supply signal is larger than the maximum duration time of the PWM in the output state. And when the zero crossing time of the next half-wave of the alternating current power supply signal is longer than the maximum duration time of the PWM in the output state, the PWM output is closed, and the number of the positive half-wave and the negative half-wave is ensured to be the same through the detection of the number of the even half-waves, so that the generation of direct current components can be prevented.

EXAMPLE five

Fig. 5 shows a schematic flow chart of an operation control method of a further embodiment of the present invention.

As shown in fig. 5, an operation control method according to still another embodiment of the present invention includes: detecting whether the rate of rise is less than a first rate threshold; if the rising rate is less than the first rate threshold, adjusting the duty cycle of the action signal to increase in the next half-wave period of the AC power supply signal to increase the rising rate to be greater than or equal to the first rate threshold. The method specifically comprises the following steps:

step 502, detecting whether the rising rate is smaller than a first rate threshold, if the detection result is yes, entering step 504, and if the detection result is no, entering step 506;

step 504, if the rising rate is smaller than the first rate threshold, adjusting the duty ratio of the action signal to increase in the next half-wave period of the ac power supply signal, so as to increase the rising rate to be greater than or equal to the first rate threshold, and continuing to step 506;

step 506, if the rising rate is greater than or equal to the first rate threshold, detecting whether the rising rate is greater than a second rate threshold, if the detection result is yes, entering step 508, and if the detection result is no, entering step 516;

step 508, if the rising rate is greater than the second rate threshold, adjusting the duty ratio of the action signal to decrease in the next half-wave period of the ac power supply signal;

step 510, detecting whether the adjusted duty ratio is smaller than a duty ratio lower limit threshold, if the detection result is yes, entering step 512, and if the detection result is no, entering step 514;

step 512, if the duty ratio is smaller than the lower threshold of the duty ratio, determining the lower threshold of the duty ratio as the actual duty ratio of the motion signal, wherein the second speed threshold is greater than the first speed threshold;

step 514, collecting the adjusted operating power consumption of the load, so as to update the first maximum duration according to the adjusted operating power consumption.

At step 516, the current duty cycle is maintained.

The second rate threshold is greater than the first rate threshold.

In this embodiment, if it is detected that the rising rate is smaller than the first rate threshold, it indicates that the change rate of the current bus voltage cannot meet the normal power supply requirement for the load, the energy storage inductor, and the bus capacitor, and the rising rate is increased by increasing the duty ratio to meet the power supply requirement.

In any of the above embodiments, optionally, the method further includes: and after controlling to increase the duty ratio, acquiring the adjusted running power consumption of the load so as to update the first maximum duration according to the adjusted running power consumption.

In this embodiment, after increasing the duty cycle, the operating power consumption is reacquired, and the first maximum duration is updated according to the operating power consumption to determine whether to re-determine the zero-crossing switching point in the intermittent oscillation mode according to the updated first maximum duration.

In this embodiment, a second rate threshold is used to represent whether excessive energy consumption occurs, that is, if the current rising rate is greater than the second rate threshold, it indicates that the load is small, and the proportion of the total power occupied by the conduction loss exceeds the specified proportion, that is, a large conduction loss occurs, and at this time, the effect of reducing the conduction loss is achieved by reducing the duty ratio.

In this embodiment, after reducing the duty cycle, the operating power consumption is reacquired, and the first maximum duration is updated according to the operating power consumption to determine whether to re-determine the zero-crossing switching point in the intermittent oscillation mode according to the updated first maximum duration.

EXAMPLE six

Fig. 6 shows a schematic flow chart of an operation control method of a further embodiment of the present invention.

As shown in fig. 6, an operation control method according to still another embodiment of the present invention includes:

step 602, if it is detected that the alternating current power supply signal reaches the zero crossing point, calculating the sum of the second time length and the alternating current half-wave time length to be experienced, and determining the sum as the sum of the second time length;

step 604, determining whether the sum of the second duration is greater than a second maximum duration;

step 606, if it is determined that the sum of the second duration is greater than the second maximum duration, determining that the second maximum duration meets the second preset switching condition, and controlling to start outputting the action signal.

In the embodiment, the alternating current power supply signal is detected, whether the zero crossing point of a half-wave of the alternating current power supply signal is reached is judged, when the alternating current power supply signal reaches the zero crossing point of the half-wave, whether the zero crossing point time of the next half-wave of the alternating current power supply signal is greater than the maximum duration time of the PWM in the output stop state or not is predicted, and when the zero crossing point time of the next half-wave of the alternating current power supply signal is greater than the maximum duration time of the PWM in the output stop state, the PWM output is started, so that the starting.

In any of the above embodiments, optionally, the method further includes: determining the reduction rate of the bus voltage in the drive control circuit in the output stopping state according to the running power consumption of the load; determining the second maximum duration based on the rate of decline.

In any of the above embodiments, optionally, the load is a compressor, the operation power consumption of the load is a three-phase current of the compressor, a bus capacitor is disposed in the drive control circuit, and the voltage across the bus capacitor is determined as the bus voltage, further including: determining the running power consumption of the compressor according to the three-phase current; determining the change rate of the bus voltage according to the running power consumption, wherein the change rate comprises a rising rate and a falling rate, if the pulse width modulation signal is in an output state, the load is powered through the alternating current power supply signal or the bus capacitor, the bus voltage is wholly in the rising state, the change rate is the rising rate, if the pulse width modulation signal enters an output stop state, the load is powered through the bus capacitor, the bus voltage is in the falling state, and the change rate is the falling rate.

In this embodiment, the detection of the compressor line current is performed by providing a current sensor to determine the operating power consumption of the load based on the detected current value, thereby determining the rate of change of the bus voltage based on the operating power consumption.

EXAMPLE seven

As shown in fig. 7, according to the operation control device 70 of an embodiment of the present invention, the operation control device may specifically include a processor 702 and a current sensor 704, the current sensor 704 collects the current of the load, and applies the current as the operation power consumption to the calculation of the change rate of the bus voltage, when the processor 702 executes a computer program, the operation control method according to any one of the above-mentioned embodiments can be implemented, so that the operation control device has the beneficial technical effects of any one of the above-mentioned operation control methods, and details are not repeated here.

Example eight

As shown in fig. 8, a drive control circuit according to an embodiment of the present invention is a drive control circuit, configured to supply a power supply signal input by a power grid system to a load, and the drive control circuit is connected to any one of the operation control devices, and includes: a power factor correction module (i.e., PFC module) including a switching device (not shown in the drawing); the driving module is electrically connected with the power factor correction module and used for outputting a pulse width modulation signal to the switching device so as to enable the power factor correction module to execute power factor correction operation; the operation control device according to the embodiment of the second aspect of the present application is electrically connected to the driving module and the load, respectively, and is configured to: the alternating current power supply signal reaches any zero crossing point, the duration of the action signal in the current state meets a preset switching condition, and state switching operation is executed at the zero crossing point, wherein the state of the action signal comprises an output state and a stop output state, the bus voltage is in an ascending trend in the output state, the switching tube stops switching action in the stop output state, and the bus voltage is in a descending trend.

In the above embodiment, optionally, the drive control circuit further includes: and the bus capacitor C is arranged at the output end of the power factor correction module.

The power factor correction module as shown in the figure comprises: and the energy storage inductor L is connected in series between the power supply source and the bus capacitor, the power supply source is used for generating the alternating current power supply signal, if the pulse width modulation signal is in an output state, the energy storage inductor, the bus capacitor C and the load are powered through the alternating current power supply signal, or the energy storage inductor is charged through the alternating current power supply signal, the load is powered through the bus capacitor C, and if the pulse width modulation signal is in a stop output state, the load is powered through the bus capacitor C.

In this embodiment, the active PFC circuit is provided with an energy storage inductor L and a bus capacitor C, and the bus voltage is the voltage across the bus capacitor C.

When the PWM signal is in the output state, the two operation modes can be further divided into: one mode is shown in fig. 9, power is supplied to the energy storage inductor L, the bus capacitor C and the load through a power supply signal, that is, the energy storage inductor L is in a discharge mode, the other mode is shown in fig. 10, the energy storage inductor L is charged through the power supply signal, and the load is supplied through the bus capacitor C, that is, an inductor charge mode, switching between the two working modes is realized through high-frequency switching actions of a switching device in the PFC switch module, when the PWM signal is in an output state, the bus voltage is wholly in an increasing trend, when the PWM signal is in a stop output state, as shown in fig. 11, the power supply signal and the load are equivalently in a cut-off state, the load is supplied through the bus capacitor C, and the bus voltage is in a decrease trend due to discharge of the bus capacitor C.

Example nine

A home appliance according to an embodiment of the present invention includes: a load; the driving control circuit according to any one of the above embodiments, the driving control circuit is connected between a power grid system and a load, and the driving control circuit is configured to control the power grid system to supply power to the load.

In this embodiment, the home appliance includes the driving control circuit described in any of the above embodiments, so that the home appliance includes all the beneficial effects of the driving control circuit described in any of the above embodiments, and details are not repeated 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.

Example ten

A computer-readable storage medium according to an embodiment of the invention, has stored thereon a computer program which, when executed, implements the steps of the operation control method as described in any one of the above.

In this embodiment, the computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the operation control method in any of the above embodiments is implemented, so that the computer-readable storage medium includes all the beneficial effects of the operation control method in any of the above embodiments, and details are not described again.

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

1. An operation control method for a driving control circuit, the driving control circuit including a power factor correction module including a switching device for controlling an ac power supply signal to supply power to a load by outputting an operation signal to the switching device, the operation control method comprising:

the alternating current power supply signal reaches any zero crossing point, the duration of the action signal in the current state meets the preset switching condition, the state switching operation is executed at the zero crossing point,

the state of the action signal comprises an output state and an output stopping state, the bus voltage is in an ascending trend in the output state, the switching tube stops switching action in the output stopping state, and the bus voltage is in a descending trend.

2. The operation control method according to claim 1, wherein the ac power supply signal reaches any zero-crossing point, and a duration of the action signal in the current state satisfies a preset switching condition, and a state switching operation is performed at the zero-crossing point, specifically including:

if the action signal is in an output state, recording a first duration of the output state;

when the alternating current power supply signal reaches any zero crossing point and the first time length meets a first preset switching condition, stopping outputting the action signal at the current zero crossing point;

if the action signal is in the output stopping state, recording a second duration of the output stopping state;

and when the alternating current power supply signal reaches any zero crossing point and the second time length meets a second preset switching condition, starting to output the action signal at the current zero crossing point.

3. The operation control method according to claim 2, wherein the ac power supply signal reaches any zero-crossing point, and if the first duration satisfies a first preset switching condition, the output of the action signal is stopped at the current zero-crossing point, specifically including:

if the alternating current power supply signal is detected to reach the zero crossing point, calculating the sum of the first time length and the alternating current half-wave time length to be experienced, and determining the sum as the sum of the first time length;

judging whether the sum of the first duration is greater than a first maximum duration;

and if the sum of the first time length is judged to be larger than the first maximum duration, controlling to stop outputting the action signal.

4. The operation control method according to claim 3, wherein detecting whether a sum of the first duration and a first duration of the ac half-wave duration to be experienced is greater than the first maximum duration if it is detected that the ac power supply signal reaches a zero crossing point, specifically comprises:

if the alternating current power supply signal is detected to reach the zero crossing point, counting the number of half waves experienced by the alternating current power supply signal in the output state;

and if the number of the half waves is detected to be an even number, detecting whether the sum of the first duration is greater than the first maximum duration.

5. The operation control method according to claim 3, characterized by further comprising:

determining the rising rate of the bus voltage in the drive control circuit in the output state according to the input power of the alternating current power supply signal and the running power consumption of the load;

determining the first maximum duration according to the rise rate.

6. The operation control method according to claim 5, characterized by further comprising:

detecting whether the rate of rise is less than a first rate threshold;

if the rising rate is less than the first rate threshold, adjusting the duty cycle of the action signal to increase in the next half-wave period of the AC power supply signal to increase the rising rate to be greater than or equal to the first rate threshold.

7. The operation control method according to claim 6, characterized by further comprising:

and after the duty ratio is increased in the next half-wave period of the alternating current power supply signal, acquiring the adjusted operation power consumption of the load in the next half-wave period so as to update the first maximum duration according to the adjusted operation power consumption.

8. The operation control method according to claim 6, characterized by further comprising:

if the rising rate is greater than or equal to the first rate threshold, detecting whether the rising rate is greater than a second rate threshold;

if the rising rate is larger than the second rate threshold, adjusting the duty ratio of the action signal to be reduced in the next half-wave period of the alternating current power supply signal;

detecting whether the adjusted duty ratio is smaller than a duty ratio lower limit threshold value;

if the duty ratio is smaller than the lower limit threshold of the duty ratio, determining the lower limit threshold of the duty ratio as the actual duty ratio of the action signal,

wherein the second rate threshold is greater than the first rate threshold.

9. The operation control method according to claim 8, characterized by further comprising:

and after controlling to reduce the duty ratio, acquiring the adjusted running power consumption of the load so as to update the first maximum duration according to the adjusted running power consumption.

10. The operation control method according to any one of claims 3 to 9, wherein when the ac power supply signal reaches any zero crossing point, and the second time duration satisfies a second preset switching condition, the output of the action signal is started at the current zero crossing point, specifically including:

if the alternating current power supply signal is detected to reach the zero crossing point, calculating the sum of the second time length and the alternating current half-wave time length to be experienced, and determining the sum as the sum of the second time length;

judging whether the sum of the second duration is greater than a second maximum duration;

and if the sum of the second duration is judged to be greater than the second maximum duration, determining that the second maximum duration meets the second preset switching condition, and controlling to start outputting the action signal.

11. The operation control method according to claim 10, characterized by further comprising:

determining the reduction rate of the bus voltage in the drive control circuit in the output stopping state according to the running power consumption of the load;

determining the second maximum duration based on the rate of decline.

12. An operation control device provided with a processor, characterized in that the processor, when executing a computer program, is capable of implementing an operation control method according to any one of claims 1 to 11.

13. A drive control circuit for controlling a supply of a supply signal to a load, comprising:

a power factor correction module comprising a switching device;

the driving module is electrically connected with the power factor correction module and used for outputting a pulse width modulation signal to the switching device so as to enable the power factor correction module to execute power factor correction operation;

the operation control device according to claim 12, electrically connected to the driving module and the load, respectively, the operation control device being configured to:

14. The drive control circuit according to claim 13, further comprising:

the bus capacitor is arranged at the output end of the power factor correction module;

the power factor correction module includes: the energy storage inductor is connected in series between a power supply and the bus capacitor, the power supply is used for sending the alternating current power supply signal,

if the pulse width modulation signal is in an output state, the energy storage inductor, the bus capacitor and the load are powered through the alternating current power supply signal, or the energy storage inductor is charged through the alternating current power supply signal, the load is powered through the bus capacitor, and if the pulse width modulation signal is in a stop output state, the load is powered through the bus capacitor.

15. An appliance, comprising:

a load;

the drive control circuit according to claim 13 or 14, the drive control circuit being interposed between a supply signal and a load, the drive control circuit being configured to control the supply signal to supply power to the load.

16. The home device of claim 15,

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.

17. A computer-readable storage medium having stored thereon a computer program, characterized in that,

the computer program, when executed, implementing the steps of the operation control method of any one of claims 1 to 11.