WO2020237851A1 - Drive control method and apparatus, and household appliance and computer-readable storage medium - Google Patents

Abstract

A drive control method and apparatus, and a household appliance and a computer-readable storage medium. The drive control method comprises: during a load operating process, detecting a power supply signal (S102); and controlling, according to the power supply signal, a switch device to work in a first mode or in a second mode, wherein the first mode is configured to be a mode where the switch device is controlled to be cut off, and the second mode is configured to be a mode where the switch device works according to a designated pulse drive signal, such that a given current in the second mode follows an alternating-current voltage input into the load (S104). The method improves the working efficiency of driving a load to operate, and reduces circuit power consumption and hardware loss.

Description

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

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910473271.1, and the application name is "drive control methods, devices, household appliances, and computer-readable storage media" on May 31, 2019, and the entire content Incorporated in this application by reference.

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on May 31, 2019, the application number is 201910472228.3, and the application name is "drive control methods, devices, household appliances, and computer-readable storage media", and the entire content Incorporated in this application by reference.

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on May 31, 2019, the application number is 201910473287.2, and the application name is "drive control methods, devices, household appliances, and computer-readable storage media", and the entire content Incorporated in this application by reference.

Technical field

This application relates to the field of drive control, and in particular, to a drive control method, a drive control device, a household appliance and a computer-readable storage medium.

Background technique

PFC (Power Factor Correction, power factor correction) technology is widely used in drive control circuits, and its main function is to improve the power efficiency of electrical equipment (load).

In related technologies, PWM (Pulse-Width Modulation, pulse width modulation signal) is usually used to drive the switch tube to turn on or off. Commonly used PFC modules include Boost PFC modules and bridgeless totem pole PFC modules, two types of PFC The module has at least the following technical defects when driving the load:

(1) The circuit structure of the Boost PFC module is simple, that is, the charging and discharging process of the inductor is controlled by the switch tube. However, the efficiency of the Boost 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. However, the bridgeless totem pole PFC module usually works in high frequency or power frequency mode, which not only leads to the drive control circuit High hardware loss and high power consumption are also not conducive to further improving the energy efficiency of the load.

In addition, any discussion of the background technology in the entire specification does not mean that the background technology must be the prior art known to those skilled in the art. Any discussion of the prior art in the entire specification does not mean that the prior art must be considered Is widely known or must constitute common knowledge in the field.

Application content

This application aims to solve at least one of the technical problems existing in the prior art or related technologies.

For this reason, one purpose of this application is to propose a drive control method.

Another purpose of this application is to provide a drive control device.

Another purpose of this application is to propose a household appliance.

Another purpose of this application is to provide a computer-readable storage medium.

In the technical solution of the first aspect of the present application, a drive control method is proposed, including: detecting the power supply signal during the operation of the load; and controlling the switching device to operate in a first mode according to the power supply signal. Work or work in a second mode, wherein the first mode is configured as a mode in which the switching device is turned off, and the second mode is configured as a mode in which the switching device operates according to a specified pulse drive signal, so that The given current in the second mode follows the AC voltage input to the load.

In this technical solution, the switching device is controlled to operate in the first mode or in the second mode according to the power supply signal. The power supply signal includes the AC voltage before rectification and the bus voltage after rectification, referring to the bus voltage and the bus voltage The relationship between the threshold values determines the operating mode of the switching device, and determines the switching moment in combination with the trend of the alternating voltage with time. The first mode is configured to control the switching off of the switching device. In the first mode Stop sending driving signals to the switching device to reduce the power consumption and hardware loss of the switching device. As the bus voltage continues to drop, it is also necessary to run the second mode to boost the load and correct the power factor of the load. Correspondingly, the second mode is configured as a mode in which the switching device operates according to a specified pulse drive signal, so that a given current in the second mode follows the bus signal.

Among them, the pulse drive signal includes pulse width, duty cycle, switching frequency, etc., but is not limited thereto.

Further, those skilled in the art can understand that the normal operation of the load can be ensured in both the first mode and the second mode, that is, a switching point between the first mode and the second mode corresponds to the maximum threshold of the bus signal, The other switching point between the first mode and the second mode corresponds to the minimum threshold of the bus signal. Both the duration of the first mode and the duration of the second mode depend on the rate of change of the bus signal, so as to ensure the normal operation of the load. Next, try to increase the duration of the first mode, thereby effectively reducing the operating time, turn-on times, hardware loss and failure rate of the switching device.

Optionally, the AC signal in the power supply signal is a continuous signal, and the AC signal includes a positive half cycle signal and a negative half cycle signal alternately distributed, and the switching time between the first mode and the second mode is The zero-crossing point time of the AC signal in the power supply signal, and the zero-crossing point time is a transition time between the adjacent positive half-cycle signal and the negative half-cycle signal.

Optionally, while outputting a pulse drive signal to the switching device in the second mode, a given current also needs to be applied. In order to reduce the impact of the given current on the circuit hardware, the start time and end time of the second mode are both set The zero-crossing moment, that is, the working period of the second mode includes an integer number of half cycles.

Optionally, the switching between the first mode and the second mode is performed at the moment of the zero-crossing point of the AC voltage, so as to reduce the current harmonics in the drive control circuit, which is beneficial to reduce the harmonic signal and further improve the performance of the drive control circuit. Reliability and service life.

In the technical solution of the second aspect of the present application, a drive control method is proposed, which includes: detecting a power supply signal, and predicting a power supply signal in the next cycle based on the power supply signal; The power supply signal and the power supply signal threshold value within one cycle control the switching device to work in the first mode or the second mode, wherein the first mode is configured to control the switching off of the switching device, the first The second mode is configured as a mode in which the switching device operates according to a specified pulse drive signal, so that a given current in the second mode follows the AC voltage input to the load.

In this technical solution, the switching device is controlled to work in the first mode or the second mode according to the power supply signal, the power supply signal in the next cycle, and the power supply signal threshold. The power supply signal includes the AC voltage and rectified bus voltage, the power supply signal predicts the power supply signal in the next cycle, and refers to the relationship between the bus voltage and the bus voltage threshold to determine the operating mode of the switching device, and combines the trend of the AC voltage with time The switching time is determined, wherein the first mode is configured to control the switching off of the switching device. In the first mode, the driving signal to the switching device is stopped to reduce the power consumption and hardware loss of the switching device. With the continuous drop of the bus voltage, it is also necessary to run the second mode to boost the load and correct the power factor of the load. Correspondingly, the second mode is configured to operate the switching device according to the specified pulse drive signal. Mode so that the given current in the second mode follows the bus signal.

Among them, the pulse drive signal includes pulse width, duty cycle, switching frequency, etc., but is not limited thereto.

Further, those skilled in the art can understand that the normal operation of the load can be ensured in both the first mode and the second mode, that is, a switching point between the first mode and the second mode corresponds to the maximum threshold of the bus signal, The other switching point between the first mode and the second mode corresponds to the minimum threshold of the bus signal. Both the duration of the first mode and the duration of the second mode depend on the rate of change of the bus signal, so as to ensure the normal operation of the load. Next, try to increase the duration of the first mode, thereby effectively reducing the operating time, turn-on times, hardware loss and failure rate of the switching device.

Optionally, the AC signal in the power supply signal is a continuous signal, and the AC signal includes a positive half cycle signal and a negative half cycle signal alternately distributed, and the switching time between the first mode and the second mode is The zero-crossing point time of the AC signal in the power supply signal, and the zero-crossing point time is a transition time between the adjacent positive half-cycle signal and the negative half-cycle signal.

Optionally, while outputting a pulse drive signal to the switching device in the second mode, a given current also needs to be applied. In order to reduce the impact of the given current on the circuit hardware, the start time and end time of the second mode are both set The zero-crossing moment, that is, the working period of the second mode includes an integer number of half cycles.

Optionally, the switching between the first mode and the second mode is performed at the moment of the zero-crossing point of the AC voltage, so as to reduce the current harmonics in the drive control circuit, which is beneficial to reduce the harmonic signal and further improve the performance of the drive control circuit. Reliability and service life.

In the technical solution of the third aspect of the present application, a drive control method is proposed, including: detecting a power supply signal, and determining the minimum value of a given current in the second mode according to the rate of change of the power supply signal; The magnitude relationship between the power supply signal and the power supply signal threshold; according to the magnitude relationship, the switching device is controlled to work in the first mode or the second mode, wherein the first mode is configured to control the A mode in which the switching device is turned off, and the second mode is configured as a mode in which the switching device operates according to a specified pulse drive signal, so that a given current in the second mode follows the AC voltage input to the load.

In this technical solution, by detecting the power supply signal and determining the minimum value of the given current in the second mode according to the rate of change of the power supply signal, the minimum current for driving the load can be determined to avoid sudden power loss of the load, and further Ground, controlling the switching device to work in the first mode or the second mode according to the magnitude relationship, the power supply signal includes the AC voltage before rectification and the bus voltage after rectification, and the reference bus voltage is between the bus voltage threshold and the bus voltage threshold. The working mode of the switching device is determined, and the switching moment is determined in combination with the trend of the alternating voltage with time. The first mode is configured to control the switching off of the switching device. In the first mode, stop Send driving signals to the switching devices to reduce the power consumption and hardware loss of the switching devices. As the bus voltage continues to drop, it is also necessary to run the second mode to boost the load and correct the power factor of the load. The second mode is configured as a mode in which the switching device operates according to a designated pulse drive signal, so that a given current in the second mode follows the bus signal.

Among them, the pulse drive signal includes pulse width, duty cycle, switching frequency, etc., but is not limited thereto.

Further, those skilled in the art can understand that the normal operation of the load can be ensured in both the first mode and the second mode, that is, a switching point between the first mode and the second mode corresponds to the maximum threshold of the bus signal, The other switching point between the first mode and the second mode corresponds to the minimum threshold of the bus signal. Both the duration of the first mode and the duration of the second mode depend on the rate of change of the bus signal, so as to ensure the normal operation of the load. Next, try to increase the duration of the first mode, thereby effectively reducing the operating time, turn-on times, hardware loss and failure rate of the switching device.

Optionally, the AC signal in the power supply signal is a continuous signal, and the AC signal includes a positive half cycle signal and a negative half cycle signal alternately distributed, and the switching time between the first mode and the second mode is The zero-crossing point time of the AC signal in the power supply signal, and the zero-crossing point time is a transition time between the adjacent positive half-cycle signal and the negative half-cycle signal.

Optionally, while outputting a pulse drive signal to the switching device in the second mode, a given current also needs to be applied. In order to reduce the impact of the given current on the circuit hardware, the start time and end time of the second mode are both set The zero-crossing moment, that is, the working period of the second mode includes an integer number of half cycles.

Optionally, the switching between the first mode and the second mode is performed at the moment of the zero-crossing point of the AC voltage, so as to reduce the current harmonics in the drive control circuit, which is beneficial to reduce the harmonic signal and further improve the performance of the drive control circuit. Reliability and service life.

In the technical solution of the fourth aspect of the present application, a drive control device is proposed. The drive control device includes a processor, which is implemented when the processor executes a computer program: the drive control method according to any one of the above Therefore, the drive control device has the beneficial technical effects of any one of the drive control methods described above, which will not be repeated here.

In the technical solution of the fifth aspect of the present application, a household electrical appliance is proposed, including: a load; the drive control device as described in the technical solution of the fourth aspect of the present application; and a drive control circuit, the drive control circuit receiving Controlled by the drive control device, the drive control circuit is provided with a PFC, the PFC has at least one switching device, and the switching device is configured to control a power supply signal to supply power to the load.

In the technical solution of the sixth aspect of the present application, a computer-readable storage medium is proposed, on which a computer program is stored, and when the computer program is executed, the drive control as described in any of the above technical solutions is realized Method steps.

The additional aspects and advantages of the present application will become obvious in the following description, or be understood through the practice of the present application.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 shows a schematic flowchart of a driving control method according to an embodiment of the present application;

Fig. 2 shows a schematic flow chart of a drive control method according to another embodiment of the present application;

Fig. 3 shows a schematic flow chart of a drive control method according to another embodiment of the present application;

Fig. 4 shows a schematic diagram of a driving control current according to an embodiment of the present application;

Fig. 5 shows a schematic diagram of a driving control current according to an embodiment of the present application;

Fig. 6 shows a schematic diagram of a drive control scheme according to an embodiment of the present application;

FIG. 7 shows a timing diagram of a driving control method according to an embodiment of the present application;

FIG. 8 shows a timing diagram of a driving control method according to another embodiment of the present application;

Fig. 9 shows a timing diagram of a driving control method according to another embodiment of the present application.

Detailed ways

In order to be able to understand the above objectives, features and advantages of the application more clearly, the application will be further described in detail below in conjunction with the accompanying drawings and specific implementations. It should be noted that the embodiments of the application and the features in the embodiments can be combined with each other if there is no conflict.

In the following description, many specific details are set forth in order to fully understand this application. However, this application can also be implemented in other ways different from those described here. Therefore, the scope of protection of this application is not covered by the specific details disclosed below. Limitations of the embodiment.

As shown in FIG. 1, the driving control method according to an embodiment of the present application includes: step S102, detecting the power supply signal during the operation of the load; step S104, controlling the switching device according to the power supply signal Work in a first mode or work in a second mode, wherein the first mode is configured to control the switching device to turn off, and the second mode is configured to operate the switching device according to a specified pulse drive signal Mode, so that the given current in the second mode follows the AC voltage input to the load.

In this technical solution, the switching device is controlled to operate in the first mode or in the second mode according to the power supply signal. The power supply signal includes the AC voltage before rectification and the bus voltage after rectification, referring to the bus voltage and the bus voltage The relationship between the threshold values determines the operating mode of the switching device, and determines the switching moment in combination with the trend of the alternating voltage with time. The first mode is configured to control the switching off of the switching device. In the first mode Stop sending driving signals to the switching device to reduce the power consumption and hardware loss of the switching device. As the bus voltage continues to drop, it is also necessary to run the second mode to boost the load and correct the power factor of the load. Correspondingly, the second mode is configured as a mode in which the switching device operates according to a specified pulse drive signal, so that a given current in the second mode follows the bus signal.

Among them, the pulse drive signal includes pulse width, duty cycle, switching frequency, etc., but is not limited thereto.

Further, those skilled in the art can understand that the normal operation of the load can be ensured in both the first mode and the second mode, that is, a switching point between the first mode and the second mode corresponds to the maximum threshold of the bus signal, The other switching point between the first mode and the second mode corresponds to the minimum threshold of the bus signal. Both the duration of the first mode and the duration of the second mode depend on the rate of change of the bus signal, so as to ensure the normal operation of the load. Next, try to increase the duration of the first mode, thereby effectively reducing the operating time, turn-on times, hardware loss and failure rate of the switching device.

Optionally, the AC signal in the power supply signal is a continuous signal, and the AC signal includes a positive half cycle signal and a negative half cycle signal alternately distributed, and the switching time between the first mode and the second mode is The zero-crossing point time of the AC signal in the power supply signal, and the zero-crossing point time is a transition time between the adjacent positive half-cycle signal and the negative half-cycle signal.

Optionally, while outputting a pulse drive signal to the switching device in the second mode, a given current also needs to be applied. In order to reduce the impact of the given current on the circuit hardware, the start time and end time of the second mode are both set The zero-crossing moment, that is, the working period of the second mode includes an integer number of half cycles.

Optionally, the switching between the first mode and the second mode is performed at the moment of the zero-crossing point of the AC voltage, so as to reduce the current harmonics in the drive control circuit, which is beneficial to reduce the harmonic signal and further improve the performance of the drive control circuit. Reliability and service life.

In addition, the drive control method according to the above embodiment of the present application may also have the following additional technical features:

In any of the above technical solutions, optionally, it further includes: if the switching device operates in the first mode, judging whether the bus signal in the power supply signal is less than or equal to the first bus signal threshold; If the bus signal is less than or equal to the first bus signal threshold, the switching device is controlled to switch to the second mode to operate at a first designated time.

In this technical solution, when the switching device works in the first mode, that is, the switching device is in an off state. At this time, the capacitive element supplies power to the load, so the voltage of the capacitive element is in a downward trend. When the real-time detected power supply signal is less than or Equal to the first power supply signal threshold, indicating that the capacitive element is not enough to supply power to the load, and it needs to output a pulse drive signal to the switching device. At this time, it is necessary to control the switching device to switch to the second mode at the first specified time, and control the power supply signal to supply power to the load In this way, by detecting the power supply signal in real time and comparing the size of the power supply signal with the first power supply signal threshold, the working mode of the switching device can be switched in time to ensure the reliability of the drive control circuit to supply power to the load.

Wherein, the first power supply signal threshold is greater than or equal to the minimum threshold of the bus signal.

In any of the above technical solutions, optionally, controlling the switching device to operate in the first mode or to operate in the second mode according to the power supply signal, specifically including: if the switching device operates in the second mode , Determine whether the bus signal in the power supply signal is greater than or equal to the second bus signal threshold; if it is determined that the bus signal is greater than or equal to the second bus signal threshold, then determine whether the bus signal is greater than or equal to the third bus signal threshold. Bus signal threshold; if the bus signal is greater than or equal to the third bus signal threshold, control the switching device to switch to the first mode of operation at a second designated time.

In this technical solution, the switching device works in the first mode, the third bus signal threshold is greater than or equal to the second bus signal threshold, and the third bus signal threshold is less than or equal to the maximum threshold of the bus signal. Therefore, if the bus signal Is greater than or equal to the third bus signal threshold, the switching device is controlled to switch to the first mode at a second designated time. In order to prevent the bus signal from being too high and breaking down the capacitive element or switching device, it is switched to all After the first mode of operation, the bus voltage begins to drop, at this time the bus voltage begins to drop, and the power consumption of the switching device in the intermittent state is theoretically zero.

In any of the above technical solutions, optionally, controlling the switching device to operate in the first mode or to operate in the second mode according to the power supply signal, specifically including: if the switching device operates in the second mode , Determine whether the bus signal in the power supply signal is greater than or equal to the second bus signal threshold; if it is determined that the bus signal is greater than or equal to the second bus signal threshold, then determine whether the bus signal is greater than or equal to the third bus signal threshold. Bus signal threshold; if the bus signal is less than the third bus signal threshold, record the corresponding determination time; control the switching device to switch to the first mode at a third designated time, wherein the third The time difference between the designated time and the determination time is less than the preset time difference.

In this technical solution, the switching device works in the second mode. At this time, the bus signal is in an upward trend. When the real-time detected power supply signal is greater than or equal to the second power supply signal threshold, and the bus signal is less than the third bus signal threshold, it means Capacitive elements can be used to supply power to the load, the switching devices can be turned off, and the bus signal is not enough to break down the capacitive elements or switching devices. Therefore, at the third designated time, the switching devices are controlled to switch to the first mode and stop outputting to the switching devices. The pulse drive signal starts to supply power to the load by the capacitive element, which reduces the power consumption and loss of the switching device, and at the same time, further reduces the hardware loss and failure rate of the circuit.

Optionally, the third designated time is later than the second designated time, and the third designated time can be selected as the next zero-crossing point of the AC voltage to effectively reduce the generation of harmonic signals and electromagnetic interference during the switching mode of the switching device noise.

In any of the above technical solutions, optionally, controlling the switching device to operate in the first mode or to operate in the second mode according to the power supply signal, specifically including: if the switching device operates in the second mode , Determine whether the bus signal in the power supply signal is greater than or equal to the second bus signal threshold; if it is determined that the bus signal is less than the second bus signal threshold, control the switching device to maintain the second mode operation.

In this technical solution, if it is detected that the bus signal is less than the second bus signal threshold, there is no need to switch from the second mode to the first mode immediately, and the bus signal and the third bus signal in the next cycle can be judged in a predictive manner. The size relationship between the thresholds is used to determine the specified time for switching to the first mode in the next cycle, thereby further improving the stability and reliability of the driving load operation, and further reducing voltage fluctuations and harmonic signals.

Optionally, the designated time is the zero-crossing point of the AC voltage in the next cycle, for example, the half-wave zero-crossing point or the full-wave zero-crossing point, so as to effectively reduce noise such as harmonic signals and electromagnetic interference generated during the switching mode of the switching device.

In any of the above technical solutions, optionally, the method further includes: determining an AC signal in the power supply signal in real time, where the AC signal is a continuous signal and the AC signal includes alternately distributed positive half-cycle signals and negative half-cycle signals, Wherein, the first designated time is the zero-crossing time of the AC signal, and/or the second designated time is the zero-crossing time of the AC signal.

As shown in FIG. 2, the driving control method according to an embodiment of the present application includes: step S202, detecting a power supply signal, and predicting a power supply signal in the next cycle according to the power supply signal; step S204, according to the power supply signal , The power supply signal and the power supply signal threshold in the next cycle, controlling the switching device to work in the first mode or the second mode, wherein the first mode is configured to control the switching device to turn off The second mode is configured as a mode in which the switching device operates according to a specified pulse drive signal, so that a given current in the second mode follows the AC voltage input to the load.

In this technical solution, the switching device is controlled to work in the first mode or the second mode according to the power supply signal, the power supply signal in the next cycle, and the power supply signal threshold. The power supply signal includes the AC voltage and rectified bus voltage, the power supply signal predicts the power supply signal in the next cycle, and refers to the relationship between the bus voltage and the bus voltage threshold to determine the operating mode of the switching device, and combines the trend of the AC voltage with time The switching time is determined, wherein the first mode is configured to control the switching off of the switching device. In the first mode, the driving signal to the switching device is stopped to reduce the power consumption and hardware loss of the switching device. With the continuous drop of the bus voltage, it is also necessary to run the second mode to boost the load and correct the power factor of the load. Correspondingly, the second mode is configured to operate the switching device according to the specified pulse drive signal. Mode so that the given current in the second mode follows the bus signal.

Among them, the pulse drive signal includes pulse width, duty cycle, switching frequency, etc., but is not limited thereto.

Further, those skilled in the art can understand that the normal operation of the load can be ensured in both the first mode and the second mode, that is, a switching point between the first mode and the second mode corresponds to the maximum threshold of the bus signal, The other switching point between the first mode and the second mode corresponds to the minimum threshold of the bus signal. Both the duration of the first mode and the duration of the second mode depend on the rate of change of the bus signal, so as to ensure the normal operation of the load. Next, try to increase the duration of the first mode, thereby effectively reducing the operating time, turn-on times, hardware loss and failure rate of the switching device.

Optionally, the AC signal in the power supply signal is a continuous signal, and the AC signal includes a positive half cycle signal and a negative half cycle signal alternately distributed, and the switching time between the first mode and the second mode is The zero-crossing point time of the AC signal in the power supply signal, and the zero-crossing point time is a transition time between the adjacent positive half-cycle signal and the negative half-cycle signal.

Optionally, while outputting a pulse drive signal to the switching device in the second mode, a given current also needs to be applied. In order to reduce the impact of the given current on the circuit hardware, the start time and end time of the second mode are both set The zero-crossing moment, that is, the working period of the second mode includes an integer number of half cycles.

Optionally, the switching between the first mode and the second mode is performed at the moment of the zero-crossing point of the AC voltage, so as to reduce the current harmonics in the drive control circuit, which is beneficial to reduce the harmonic signal and further improve the performance of the drive control circuit. Reliability and service life.

In addition, the drive control method according to the above embodiment of the present application may also have the following additional technical features:

In any of the above technical solutions, optionally, according to the power supply signal, the power supply signal in the next cycle, and the power supply signal threshold, the switching device is controlled to work in the first mode or the second mode, specifically The method includes: if the switching device works in the first mode, determining whether the bus signal in the power supply signal is less than or equal to the first bus signal threshold in the power supply signal threshold; if it is determined that the bus signal is less than or It is equal to the first bus signal threshold, then the switching device is controlled to switch to the second mode to work at a specified time.

In this technical solution, when the switching device works in the first mode, that is, the switching device is in the off state, the capacitive element supplies power to the load at this time, so the voltage of the capacitive element is in a downward trend. When the power supply signal is less than or equal to the first power supply The signal threshold indicates that the capacitive element is not sufficient to supply power to the load, and it is necessary to output a pulse drive signal to the switching device. At this time, it is necessary to control the switching device to switch to the second mode at the first specified time, and control the power supply signal to supply power to the load. The power supply signal is compared with the threshold value of the first power supply signal, so as to switch the working mode of the switching device in time to ensure the reliability of the power supply of the drive control circuit to the load.

Wherein, the first power supply signal threshold is greater than or equal to the minimum threshold of the bus signal.

In any of the above technical solutions, optionally, according to the power supply signal, the power supply signal in the next cycle, and the power supply signal threshold, the switching device is controlled to work in the first mode or the second mode, specifically It also includes: if the switching device operates in the first mode, determining whether the bus signal in the power supply signal is less than or equal to the first bus signal threshold in the power supply signal threshold; if it is determined that the bus signal is greater than The first bus signal threshold, predict the bus signal in the next cycle; determine whether the bus signal in the next cycle is less than or equal to the first bus signal threshold; if it is determined in the next cycle If the bus signal is less than or equal to the first bus signal threshold, the switching device is controlled to switch to the second mode at a specified time.

In this technical solution, if it is detected in the current cycle that the bus voltage has not fallen to less than or equal to the first bus signal threshold, the switching device is kept operating in the first mode, and the bus signal in the next cycle is predicted, for example, detecting After reaching the change rate of the bus signal, the bus signal is time-integrated, or the average change rate of the bus signal is multiplied by the duration. If the bus signal of the next cycle is predicted to be less than or equal to the first bus signal threshold, the bus signal is below One cycle cannot meet the operating demand of the load, therefore, the second mode is switched to work at a specified time.

Optionally, the designated time is the zero-crossing time of the AC signal.

In any of the above technical solutions, optionally, according to the power supply signal, the power supply signal in the next cycle, and the power supply signal threshold, the switching device is controlled to work in the first mode or the second mode, specifically It further includes: if the switching device operates in the second mode, determining whether the bus signal in the power supply signal is greater than or equal to the second bus signal threshold in the power supply signal threshold; if it is determined that the bus signal is greater than Or equal to the second bus signal threshold, control the switching device to switch to the first mode of operation at a specified time.

In this technical solution, by determining that the bus signal is greater than or equal to the second bus signal threshold, and the second bus signal threshold is less than or equal to the maximum threshold of the bus signal, in order to avoid breakdown of the capacitive element or switching device, then Controlling the switching device to switch to the first mode to work at a specified time, while reducing the power consumption of the switching device, further improves the reliability of the drive control circuit.

In any of the above technical solutions, optionally, if the switching device operates in the second mode, it is determined whether the bus signal in the power supply signal is greater than or equal to the second bus signal in the power supply signal threshold. Threshold; if it is determined that the bus signal is less than the second bus signal threshold, predict the power supply signal in the next cycle; determine the difference between the bus signal in the next cycle and the third bus signal threshold Size relationship; according to the size relationship between the power supply signal in the next cycle and the third bus signal threshold, control the switching device to switch to the first mode of operation at a specified time.

In any of the above technical solutions, optionally, according to the magnitude relationship between the power supply signal in the next period and the third power supply signal threshold, control the switching device to switch to the first mode at a specified time The work specifically includes: predicting the AC signal in the power supply signal in the next cycle, and determining that the first zero-crossing point of the AC signal in the next cycle is a half-wave zero-crossing point or a full-wave zero-crossing point; if If the first zero-crossing point is the full-wave zero-crossing point, it is determined whether the bus signal in the power supply signal corresponding to the full-wave zero-crossing point is greater than or equal to the third bus signal threshold in the power supply signal threshold; If the bus signal corresponding to the full-wave zero-crossing point is greater than or equal to the third bus signal threshold, the switching device is controlled to switch to the first mode of operation at the full-wave zero-crossing point of the next cycle.

In this technical solution, the bus voltage rises when the switching device works in the second mode, and the third bus signal threshold is less than the second bus signal threshold. Therefore, if the bus signal corresponding to the full-wave zero crossing point is greater than or equal to the third The bus signal threshold value controls the switching device to switch to the first mode at the full-wave zero-crossing point of the next cycle, which not only prevents the bus signal from being too high to break down the capacitive element or switching device, but also The mode switching at the wave zero crossing reduces the current harmonics. In addition, the theoretical power consumption of the switching device in the first mode is zero, that is, without affecting the load operation, the load energy efficiency is further improved.

In any of the above technical solutions, optionally, according to the magnitude relationship between the power supply signal in the next period and the third power supply signal threshold, control the switching device to switch to the first mode at a specified time The work specifically includes: predicting the power supply signal in the next cycle, and determining that the first zero-crossing point of the AC signal in the next cycle is a half-wave zero-crossing point or a full-wave zero-crossing point; If one zero-crossing point is the half-wave zero-crossing point, it is determined whether the bus signal in the power supply signal corresponding to the half-wave zero-crossing point is greater than or equal to the fourth bus signal threshold in the power supply signal threshold; The bus signal corresponding to the zero point is greater than or equal to the fourth bus signal threshold, and the switching device is controlled to switch to the first mode of operation at the half-wave zero-crossing point of the next cycle.

In this technical solution, the bus voltage rises when the switching device works in the second mode, the third bus signal threshold is less than the fourth bus signal threshold, and the fourth bus signal threshold is less than the second bus signal threshold. Therefore, if the half-wave If the bus signal corresponding to the zero-crossing point is greater than or equal to the fourth bus signal threshold, the switching device is controlled to switch to the first mode at the half-wave zero-crossing point of the next cycle, and the switching time of the half-wave zero-crossing point The switching time earlier than the full-wave zero-crossing point not only prevents the bus signal from being too high and breakdowns capacitive components or switching devices, but also performs mode switching at the half-wave zero-crossing point to reduce current harmonics. In addition, switching in the first mode The theoretical power consumption of the device is zero, that is, the load energy efficiency is further improved without affecting the load operation.

In any of the above technical solutions, optionally, the method further includes: determining an AC signal in the power supply signal in real time, where the AC signal is a continuous signal and the AC signal includes alternately distributed positive half-cycle signals and negative half-cycle signals, Wherein, the first designated time is the zero-crossing time of the AC signal, and/or the second designated time is the zero-crossing time of the AC signal.

As shown in FIG. 3, the driving control method according to an embodiment of the present application includes: step S302, detecting a power supply signal, and determining the minimum value of the given current in the second mode according to the rate of change of the power supply signal; S304: Compare the magnitude relationship between the power supply signal and the power supply signal threshold; step S306, control the switching device to operate in the first mode or the second mode according to the magnitude relationship, wherein the first The mode is configured as a mode in which the switching device is turned off, and the second mode is configured as a mode in which the switching device operates according to a specified pulse drive signal, so that a given current in the second mode follows the input to all The AC voltage of the load.

In this technical solution, by detecting the power supply signal and determining the minimum value of the given current in the second mode according to the rate of change of the power supply signal, the minimum current for driving the load can be determined to avoid sudden power loss of the load, and further Ground, controlling the switching device to work in the first mode or the second mode according to the magnitude relationship, the power supply signal includes the AC voltage before rectification and the bus voltage after rectification, and the reference bus voltage is between the bus voltage threshold and the bus voltage threshold. The working mode of the switching device is determined, and the switching moment is determined in combination with the trend of the alternating voltage with time. The first mode is configured to control the switching off of the switching device. In the first mode, stop Send driving signals to the switching devices to reduce the power consumption and hardware loss of the switching devices. As the bus voltage continues to drop, it is also necessary to run the second mode to boost the load and correct the power factor of the load. The second mode is configured as a mode in which the switching device operates according to a designated pulse drive signal, so that a given current in the second mode follows the bus signal.

Among them, the pulse drive signal includes pulse width, duty cycle, switching frequency, etc., but is not limited thereto.

Further, those skilled in the art can understand that the normal operation of the load can be ensured in both the first mode and the second mode, that is, a switching point between the first mode and the second mode corresponds to the maximum threshold of the bus signal, The other switching point between the first mode and the second mode corresponds to the minimum threshold of the bus signal. Both the duration of the first mode and the duration of the second mode depend on the rate of change of the bus signal, so as to ensure the normal operation of the load. Next, try to increase the duration of the first mode, thereby effectively reducing the operating time, turn-on times, hardware loss and failure rate of the switching device.

Optionally, the AC signal in the power supply signal is a continuous signal, and the AC signal includes a positive half cycle signal and a negative half cycle signal alternately distributed, and the switching time between the first mode and the second mode is The zero-crossing point time of the AC signal in the power supply signal, and the zero-crossing point time is a transition time between the adjacent positive half-cycle signal and the negative half-cycle signal.

Optionally, while outputting a pulse drive signal to the switching device in the second mode, a given current also needs to be applied. In order to reduce the impact of the given current on the circuit hardware, the start time and end time of the second mode are both set The zero-crossing moment, that is, the working period of the second mode includes an integer number of half cycles.

Optionally, the switching between the first mode and the second mode is performed at the moment of the zero-crossing point of the AC voltage, so as to reduce the current harmonics in the drive control circuit, which is beneficial to reduce the harmonic signal and further improve the performance of the drive control circuit. Reliability and service life.

In addition, the drive control method according to the above embodiment of the present application may also have the following additional technical features:

In any of the above technical solutions, optionally, detecting the power supply signal and determining the minimum value of the given current in the second mode according to the rate of change of the power supply signal specifically includes: in the second mode, real-time Determine the bus signal, AC voltage and AC current contained in the power supply signal; calculate the difference between the bus signal and the given bus signal, and the rate of change of the bus signal is configured to be able to determine the supply The minimum value of the constant current; the difference between the bus signal and the given bus signal is input to a first PI controller, and the first PI controller is configured to be able to output the second mode A given current; the given current, the AC voltage and the AC current after the limiting processing are input to the second PI controller, and the second PI controller is configured to be able to output the drive pulse drive Signal, wherein the given current is configured to control the bus signal to rise.

In this technical solution, the steps performed by the first PI controller and the second PI controller are as follows:

(1) The first PI controller determines the rate of change _according to the difference between the bus signal V _dc and the bus signal threshold V _dcref , thereby determining the gain value I _{ref_dc of} a given current, and the product of the gain value and the AC voltage V _ac is given Constant current, after performing current limiting processing on the given current, output to the second PI controller.

(2) The second PI controller calculates and determines the pulse drive signal according to the given current and the alternating current I _ac , where the pulse drive signal includes the duty cycle of the switching device, the conduction time, and the switching frequency.

Among them, the first PI controller and the second PI controller are both proportional integral controllers.

In any of the above technical solutions, optionally, according to the magnitude relationship between the power supply signal in the next period and the third power supply signal threshold, control the switching device to switch to the first mode at a specified time The work specifically includes: predicting the bus signal in the next cycle, and determining that the first zero-crossing point of the next cycle is a half-wave zero-crossing point or a full-wave zero-crossing point; if the first zero-crossing point is all For the full-wave zero-crossing point, it is determined whether the bus signal corresponding to the full-wave zero-crossing point is greater than or equal to the third bus signal threshold in the power supply signal threshold; if the bus signal corresponding to the full-wave zero-crossing point is greater than or equal to all The third bus signal threshold is used to control the switching device to switch to the first mode of operation at the full-wave zero-crossing point of the next cycle.

In this technical solution, when the switching device works in the second mode, the bus voltage is increased, and the third bus signal threshold is less than the second bus signal threshold. Therefore, if the bus signal corresponding to the full-wave zero-crossing point is greater than or equal to the third The bus signal threshold value controls the switching device to switch to the first mode at the full-wave zero-crossing point of the next cycle, which not only prevents the bus signal from being too high to break down the capacitive element or switching device, but also The mode switching at the wave zero crossing reduces the current harmonics. In addition, the theoretical power consumption of the switching device in the first mode is zero, that is, without affecting the load operation, the load energy efficiency is further improved.

In any of the above technical solutions, optionally, according to the magnitude relationship between the power supply signal in the next period and the third power supply signal threshold, control the switching device to switch to the first mode at a specified time The work specifically includes: predicting the bus signal in the next cycle, and determining that the first zero-crossing point of the next cycle is a half-wave zero-crossing point or a full-wave zero-crossing point; if the first zero-crossing point is all For the half-wave zero-crossing point, it is determined whether the bus signal corresponding to the half-wave zero-crossing point is greater than or equal to the fourth bus signal threshold in the power supply signal threshold; if the bus signal corresponding to the half-wave zero-crossing point is greater than or equal to all The fourth bus signal threshold is used to control the switching device to switch to the first mode at the half-wave zero-crossing point of the next cycle.

In this technical solution, the switching device increases the bus voltage when operating in the second mode, the third bus signal threshold is less than the fourth bus signal threshold, and the fourth bus signal threshold is less than the second bus signal threshold. Therefore, if the half-wave If the bus signal corresponding to the zero-crossing point is greater than or equal to the fourth bus signal threshold, the switching device is controlled to switch to the first mode at the half-wave zero-crossing point of the next cycle, and the switching time of the half-wave zero-crossing point The switching time earlier than the full-wave zero-crossing point not only prevents the bus signal from being too high and breakdowns capacitive components or switching devices, but also performs mode switching at the half-wave zero-crossing point to reduce current harmonics. In addition, switching in the first mode The theoretical power consumption of the device is zero, that is, the load energy efficiency is further improved without affecting the load operation.

In any of the above technical solutions, optionally, the drive control circuit further includes a capacitive element, the capacitive element is connected between the switching device and the load, and the capacitive element includes multiple Electrolytic capacitors in series and/or in parallel, or the capacitive element includes a plurality of film capacitors in series and/or in parallel, the operation control method further includes: according to the withstand voltage threshold of the capacitive element and the switching device The withstand voltage threshold determines the second bus signal threshold.

In this technical solution, the second bus signal threshold is determined according to the withstand voltage threshold of the capacitive element and the withstand voltage threshold of the switch tube. On the one hand, the breakdown of the capacitive element and the switch tube is reduced. On the other hand, the second bus signal threshold determines the moment when the switch tube switches between the first mode and the second mode, which further improves the reliability of the power factor correction module and the energy efficiency of load operation.

In any of the above technical solutions, optionally, the method further includes: detecting the current of the load, calculating and determining the power of the load according to the current of the load; and determining the current corresponding to the given current in the second mode The input power of the load; calculating the difference between the input power and the power of the load, the difference being configured as the charging power; determining the rate of change of the bus signal according to the charging power; The minimum value of the given current in the second mode is determined according to the rate of change of the bus signal, wherein the given current is configured to control the rise of the bus signal.

In this technical solution, by determining the minimum given current in the second mode according to the voltage change rate, the reliability and stability of the bus voltage rise are improved, and the performance of the drive control solution defined in the embodiment of the application is further improved. reliability.

Fig. 4 shows a schematic diagram of a driving control current according to an embodiment of the present application.

As shown in FIG. 4, according to the drive control circuit of an embodiment of the present application, the drive control circuit is connected between the AC of the power grid system and the input end of the load, and specifically includes: a bridge rectifier module and a boost type power factor correction module , Capacitive component C (with filtering characteristics) and inverter, among them, the bridge rectifier module is used to convert AC signals into pulsating DC signals, and the Boost type power factor correction module includes inductive components L, switching tubes Q and one-way For the pass device D, due to the charging and discharging effects of the capacitive element C, the voltage on the capacitive element C presents a sawtooth ripple. Combined with the conduction characteristics of the unidirectional device D, only when the instantaneous value of the AC line voltage is higher than the capacitance When the voltage on the linear element, the unidirectional conducting device D will be turned on due to the forward bias, that is, in each cycle of the AC line input signal, the unidirectional conducting device D will be turned on only near the peak value. The input AC voltage presents a sine wave waveform, but the input AC current has a large number of spikes, that is, the harmonic components that cause the circuit's low power factor.

Therefore, the Boost type power factor correction module can not only solve the problem of the phase difference between the AC voltage and the AC current, but also solve the electromagnetic interference and electromagnetic compatibility problems caused by harmonic signals.

Further, for the purpose of further improving the energy efficiency of load operation, for the above-mentioned active Boost power factor correction module, the operating mode of the switch tube is adjusted in combination with the operating parameters of the load, especially when it is detected that the driving load is required to operate. When the power is low, whether the switch tube is working is controlled according to the power supply signal, where the power supply signal includes the AC voltage and bus voltage of the AC input of the grid system.

Furthermore, if it is determined that the switch tube is operating in the second mode, the relationship between the bus voltage and the maximum threshold V _{dc_max} of the bus signal, and the relationship between the bus voltage and the minimum threshold V _{dc_min of the} bus signal are further combined. , To control the output pulse drive signal to the switch tube or stop outputting the pulse drive signal to the switch tube.

Specifically, if the bus voltage exceeds the upper limit voltage threshold, stop outputting the pulse drive signal to the switch tube, that is, switch to the first mode of operation, that is, the switch tube is in an intermittent state. If the bus voltage is lower than the minimum threshold V _{dc_min of the} bus signal, then Output the pulse drive signal to the switch tube, that is, switch to the second mode of operation, that is, the switch tube is in the working state, so that the given current I _{S is} close to the sine wave waveform.

Still further, the switching moment between the first mode and the second mode is the zero-crossing point of the AC signal, so as to further reduce the spike signal in the drive control circuit.

Fig. 5 shows a schematic diagram of a driving control current according to an embodiment of the present application.

As shown in FIG. 5, according to the drive control circuit of another embodiment of the present application, the drive control circuit is connected between the power grid system AC and the input end of the load, and specifically includes: bridgeless totem pole PFC module, capacitive Component C (with filtering characteristics) and inverter. Among them, the bridgeless totem pole PFC module includes an inductive component L, a switch tube and a unidirectional conduction device D. Due to the charging and discharging effects of the capacitive component C, the capacitive component The voltage on C presents a sawtooth ripple. Combined with the conduction characteristics 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 unidirectional conducting device D will be biased in the forward direction. Set to conduction, that is, in each cycle of the AC line input signal, only the unidirectional conduction device D will be turned on near the peak value. The input AC voltage presents a sine wave waveform, but the input AC current has a large number of spikes Pulse, that is, the harmonic component that causes the circuit's power factor to drop.

Therefore, the bridgeless totem pole PFC module can not only solve the problem of the phase difference between the AC voltage and the AC current, but also solve the electromagnetic interference and electromagnetic compatibility problems caused by the harmonic signal. In this embodiment, the switch tube includes The first switching tube Q ₁ , the second switching tube Q ₂ , the third switching tube Q ₃ and the fourth switching tube Q ₄ , wherein the first switching tube Q ₁ and the second switching tube Q ₂ are high-frequency switching tubes, The third switching tube Q ₃ and the fourth switching tube Q ₄ are low-frequency switching tubes.

Further, for the purpose of further improving the energy efficiency of load operation, for the above-mentioned active bridgeless totem pole PFC module, the operating mode of the switch tube is adjusted in combination with the operating parameters of the load, especially when it is detected that the driving load is operating. When the power demand is low, the switch tube is controlled according to the power supply signal, where the power supply signal includes the AC voltage and bus voltage of the AC input of the grid system.

Furthermore, if it is determined that the switch tube is operating in the second mode, the relationship between the bus voltage and the maximum threshold V _{dc_max} of the bus signal, and the relationship between the bus voltage and the minimum threshold V _{dc_min of the} bus signal are further combined. , To control the output pulse drive signal to the switch tube or stop outputting the pulse drive signal to the switch tube.

Specifically, if the bus voltage exceeds the upper limit voltage threshold, stop outputting the pulse drive signal to the switch tube, that is, switch to the first mode of operation, that is, the switch tube is in an intermittent state. If the bus voltage is lower than the minimum threshold V _{dc_min of the} bus signal, then Output the pulse drive signal to the switch tube, that is, switch to the second mode of operation, that is, the switch tube is in the working state, so that the given current I _{S is} close to the sine wave waveform.

Still further, the switching moment between the first mode and the second mode is the zero-crossing point of the AC signal, so as to further reduce the spike signal in the drive control circuit.

Fig. 6 shows a schematic diagram of a drive control scheme according to an embodiment of the present application.

As shown in Figure 6, in the drive control scheme of this embodiment, the steps executed by the PI controller include:

(1) The first PI controller determines the rate of change _according to the difference between the bus signal V _dc and the bus signal threshold V _dcref , thereby determining the gain value I _{ref_dc of} a given current, and the gain value and the AC voltage V _ac (in Figure 4 The product of the shown absolute value of the AC voltage) is the given current, which is output to the second PI controller after current limiting processing is performed on the given current.

(2) The second PI controller calculates and determines the pulse drive signal according to the given current and the alternating current I _ac , where the pulse drive signal includes the first duty cycle, the second duty cycle, the third duty cycle and the fourth duty cycle. For the empty ratio, for the same reason, a dead time is set between the conduction time of the first switching tube and the conduction time between the second switching tube. In addition, the pulse driving signal also includes the switching frequency of the switching tube.

Among them, the first PI controller and the second PI controller are both proportional integral controllers.

As shown in Figure 7 and Figure 8, for the purpose of further improving the energy efficiency of load operation, for the above-mentioned active bridgeless totem pole PFC module, the operating mode of the switch tube is adjusted in combination with the operating parameters of the load, especially in When it is detected that the power required to drive the load is low, it controls whether the switch tube works according to the power supply signal, where the power supply signal includes the AC voltage and bus voltage of the AC input of the grid system.

Magnitude relationship between the maximum threshold _V dc_max Still further, if it is determined the switch operates in a second mode, it is further coupled with the bus voltage V _dc bus signal, and a minimum threshold _V dc_min of the bus voltage V _dc bus signal The relationship between the magnitude and magnitude of the control to control the output of the pulse drive signal to the switch tube or stop the output of the pulse drive signal to the switch tube.

Specifically, if the bus voltage V _dc exceeds the upper limit voltage threshold, stop outputting the pulse drive signal to the switch tube, that is, switch to the first mode of operation, that is, the switch tube is in an intermittent state, if the bus voltage is lower than the minimum threshold of the bus signal V _{dc_min} , Then output a pulse drive signal to the switch tube, that is, switch to the second mode of work, that is, the switch tube is in the working state, so that the given current _{IS is} close to the sine wave waveform.

As shown in FIG timing of switching between the first mode and the second mode is 7 U _S AC signal zero crossings of the time, to further reduce the harmonic drive control signal circuit, a given current I _S is close to a sine Wave waveform.

As shown, between the first mode and the second mode switching timing signal AC is not a zero crossing time U _S 8, which may lead to a harmonic drive signal control circuit is too large, which also caused a given distortion large current I _S.

As shown in Fig. 9, according to the sampling value of the bus voltage, it is determined that the time T ₁₂ corresponding to a full-wave zero-crossing point is switched from the first mode to the second mode, and the bus signal V _dc changes with time. Perform prediction and sampling. Optionally, after entering the second mode, predict the first bus voltage predicted value V _{dc_pre1} corresponding to the first half-wave zero-crossing point, and compare the first bus voltage predicted value V _{dc_pre1} with the maximum bus signal threshold V _{dc_max} . If it is determined that the first bus voltage prediction value V _{dc_pre1 is} less than the maximum bus signal threshold V _{dc_max} , then continue to maintain the second mode of operation, and predict the first bus signal based on the next full-wave zero crossing point V _{dc_cur} The predicted value of bus voltage V _{dc_pre2} , compare the relationship between the predicted value of second bus voltage V _{dc_pre2} and the maximum threshold value of bus signal V _{dc_max} . If it is determined that the predicted value of second bus voltage V _{dc_pre2 is} close to the maximum threshold value of bus signal V _{dc_max} , that is, the bus signal _If the difference between the maximum threshold V _{dc_max} and the predicted second bus voltage V _{dc_pre2} is less than the difference threshold, it is determined to switch to the first mode at time T ₂₁ corresponding to another full-wave zero-crossing point.

A household appliance according to an embodiment of the present application includes: a load; the drive control device as described in any one of the above; a drive control circuit, the drive control circuit is controlled by the drive control device, and the drive control circuit is configured to There is a PFC, the PFC has at least one switching device, and the switching device is configured to control the power supply signal to supply power to the load.

In this technical solution, the home appliance includes the drive control device as described in any of the above embodiments. Therefore, the home appliance includes all the beneficial effects of the drive control device as described in any of the above embodiments. Repeat.

In an embodiment of the present application, optionally, the household electrical appliance includes at least one of an air conditioner, a refrigerator, a fan, a range hood, a vacuum cleaner, and a host computer.

In this embodiment, the switch tube is set to control the power supply signal to supply power to the load. As long as the bus voltage is within the normal variation range, the normal operation of the load can be guaranteed. Under the premise of ensuring the normal operation of the load, it can be targeted at the bus. The voltage change sets the corresponding burst (intermittent oscillation) mode control strategy, that is, the intermittent output control strategy, to control the high-frequency action signal in an intermittent output state through the intermittent output control strategy, that is, the high-frequency action signal is not required to be continuously output State, that is, the switch tube does not need to be continuously in the high-frequency switching state, which can reduce the power consumption of the power factor correction module in the drive control circuit to improve the electrical equipment (such as air conditioners) using the drive control circuit Energy efficiency.

Optionally, the controller can be MCU (Micro-programmed Control Unit), CPU (Central Processing Unit, central processing unit), DSP (Digital Signal Processor, digital signal processor) and embedded equipment. One, but not limited to this.

According to the computer-readable storage medium of the embodiment of the present application, a computer program is stored thereon, and when the computer program is executed, the steps of the drive control method as described in any of the above technical solutions are realized.

According to the technical solution of the present application, the switching device is controlled to work in the first mode or the second mode according to the power supply signal. The power supply signal includes the AC voltage before rectification and the bus voltage after rectification, with reference to the bus voltage and the bus The relationship between the voltage thresholds determines the operating mode of the switching device, and determines the switching moment in combination with the trend of the alternating voltage with time. The first mode is configured to control the switching off of the switching device. In mode, stop sending driving signals to the switching device to reduce the power consumption and hardware loss of the switching device. With the continuous drop of the bus voltage, it is also necessary to run the second mode to boost the load and perform power factor control on the load. Correction. Correspondingly, the second mode is configured as a mode in which the switching device operates according to a designated pulse drive signal, so that a given current in the second mode follows the bus signal.

Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

This application is described with reference to flowcharts and/or block diagrams of methods, equipment (systems), and computer program products according to the embodiments of this application. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.

It should be noted that in the claims, any reference signs located between parentheses should not be constructed as limitations on the claims. The word "comprising" does not exclude the presence of parts or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of multiple such components. This application can be realized by means of hardware including several different components and by means of a suitably programmed computer. In the unit claims enumerating several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third does not indicate any order. These words can be interpreted as names.

Although the optional embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be interpreted as including alternative embodiments and all changes and modifications falling within the scope of this application.

The above are only optional embodiments of the application and are not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims (23)

1. A drive control method is suitable for a drive control circuit, the drive control circuit is provided with at least one switch device, and the switch device is configured to control a power supply signal to supply power to a load, wherein the drive control method includes:

   During the operation of the load, detecting the power supply signal;

   Controlling the switching device to operate in the first mode or in the second mode according to the power supply signal,

   Wherein, the first mode is configured as a mode in which the switching device is turned off, and the second mode is configured as a mode in which the switching device operates according to a specified pulse drive signal, so that the operation in the second mode is The constant current follows the AC voltage input to the load.
2. The driving control method according to claim 1, wherein controlling the switching device to operate in the first mode or the second mode according to the power supply signal specifically comprises:

   If the switching device operates in the first mode, determining whether the bus signal in the power supply signal is less than or equal to the first bus signal threshold;

   If it is determined that the bus signal is less than or equal to the first bus signal threshold, the switching device is controlled to switch to the second mode of operation at a first designated time.
3. The driving control method according to claim 1 or 2, wherein controlling the switching device to operate in the first mode or in the second mode according to the power supply signal specifically further comprises:

   If the switching device operates in the second mode, determining whether the bus signal in the power supply signal is greater than or equal to the second bus signal threshold;

   If it is determined that the bus signal is greater than or equal to the second bus signal threshold, then it is determined whether the bus signal is greater than or equal to the third bus signal threshold;

   If the bus signal is greater than or equal to the third bus signal threshold, controlling the switching device to switch to the first mode of operation at a second designated time.
4. The driving control method according to any one of claims 1 to 3, wherein controlling the switching device to operate in the first mode or in the second mode according to the power supply signal specifically further comprises:

   If the switching device operates in the second mode, determining whether the bus signal in the power supply signal is greater than or equal to the second bus signal threshold;

   If it is determined that the bus signal is greater than or equal to the second bus signal threshold, then it is determined whether the bus signal is greater than or equal to the third bus signal threshold;

   If the bus signal is less than the third bus signal threshold, record the corresponding determination time;

   Controlling the switching device to switch to the first mode of operation at a third designated time,

   Wherein, the time difference between the third designated time and the determination time is less than a preset time difference.
5. The driving control method according to any one of claims 1 to 4, wherein controlling the switching device to operate in the first mode or in the second mode according to the power supply signal specifically further comprises:

   If the switching device operates in the second mode, determining whether the bus signal in the power supply signal is greater than or equal to the second bus signal threshold;

   If it is determined that the bus signal is less than the second bus signal threshold, the switching device is controlled to maintain the second mode operation.
6. The drive control method according to any one of claims 2 to 5, further comprising:

   Determine the AC signal in the power supply signal in real time, where the AC signal is a continuous signal and the AC signal includes alternately distributed positive half-cycle signals and negative half-cycle signals,

   Wherein, the first designated time is the zero-crossing time of the AC signal, and/or the second designated time is the zero-crossing time of the AC signal.
7. A drive control method is suitable for a drive control circuit, the drive control circuit is provided with at least one switch device, and the switch device is configured to control a power supply signal to supply power to a load, wherein the drive control method includes:

   Detecting the power supply signal, and predicting the power supply signal in the next cycle according to the power supply signal;

   Controlling the switching device to operate in the first mode or in the second mode according to the power supply signal, the power supply signal in the next cycle, and the power supply signal threshold,

   Wherein, the first mode is configured as a mode in which the switching device is turned off, and the second mode is configured as a mode in which the switching device operates according to a specified pulse drive signal, so that the operation in the second mode is The constant current follows the AC voltage input to the load.
8. 7. The driving control method according to claim 7, wherein the switching device is controlled to operate in the first mode or the second mode according to the power supply signal, the power supply signal in the next cycle, and the power supply signal threshold, Specifically:

   If the switching device operates in the first mode, determining whether the bus signal in the power supply signal is less than or equal to the first bus signal threshold in the power supply signal threshold;

   If it is determined that the bus signal is less than or equal to the first bus signal threshold, the switching device is controlled to switch to the second mode of operation at a specified time.
9. The driving control method according to claim 7 or 8, wherein the switching device is controlled to operate in the first mode or in the second mode according to the power supply signal, the power supply signal in the next cycle, and the power supply signal threshold. Work, including:

   If the switching device operates in the first mode, determining whether the bus signal in the power supply signal is less than or equal to the first bus signal threshold in the power supply signal threshold;

   If it is determined that the bus signal is greater than the first bus signal threshold, predict the bus signal in the next cycle;

   Judging whether the bus signal in the next cycle is less than or equal to the first bus signal threshold;

   If it is determined that the bus signal in the next cycle is less than or equal to the first bus signal threshold, control the switching device to switch to the second mode of operation at a specified time.
10. The drive control method according to any one of claims 7 to 9, wherein, according to the power supply signal, the power supply signal in the next cycle, and the power supply signal threshold, the switching device is controlled to operate in the first mode or Working in the second mode includes:

    If the switching device operates in the second mode, determining whether the bus signal in the power supply signal is greater than or equal to the second bus signal threshold in the power supply signal threshold;

    If it is determined that the bus signal is greater than or equal to the second bus signal threshold, the switching device is controlled to switch to the first mode of operation at a specified time.
11. The driving control method according to any one of claims 7 to 10, wherein, according to the power supply signal, the power supply signal in the next cycle, and the power supply signal threshold, the switching device is controlled to operate in the first mode or Working in the second mode includes:

    If the switching device operates in the second mode, determining whether the bus signal in the power supply signal is greater than or equal to the second bus signal threshold in the power supply signal threshold;

    If it is determined that the bus signal is less than the second bus signal threshold, predict the power supply signal in the next cycle;

    Determine the magnitude relationship between the bus signal in the next cycle and the third bus signal threshold;

    According to the magnitude relationship between the power supply signal in the next cycle and the third bus signal threshold, the switching device is controlled to switch to the first mode of operation at a specified time.
12. The driving control method according to any one of claims 8 to 11, wherein, according to the magnitude relationship between the power supply signal in the next cycle and the third power supply signal threshold, the switching device is controlled to be at a specified time Switching to the first mode of work specifically includes:

    Predicting the AC signal in the power supply signal in the next cycle, and determining that the first zero-crossing point of the AC signal in the next cycle is a half-wave zero-crossing point or a full-wave zero-crossing point;

    If the first zero-crossing point is the full-wave zero-crossing point, determining whether the bus signal in the power supply signal corresponding to the full-wave zero-crossing point is greater than or equal to the third bus signal threshold in the power supply signal threshold;

    If the bus signal corresponding to the full-wave zero-crossing point is greater than or equal to the third bus signal threshold, the switching device is controlled to switch to the first mode of operation at the full-wave zero-crossing point of the next cycle.
13. The driving control method according to any one of claims 8 to 12, wherein, according to the magnitude relationship between the power supply signal in the next cycle and the third power supply signal threshold, the switching device is controlled to be at a specified time Switching to the first mode of work specifically includes:

    Predicting the power supply signal in the next cycle, and determining that the first zero-crossing point of the AC signal in the next cycle is a half-wave zero-crossing point or a full-wave zero-crossing point;

    If the first zero-crossing point is the half-wave zero-crossing point, determining whether the bus signal in the power supply signal corresponding to the half-wave zero-crossing point is greater than or equal to the fourth bus signal threshold in the power supply signal threshold;

    If the bus signal corresponding to the half-wave zero-crossing point is greater than or equal to the fourth bus signal threshold, the switching device is controlled to switch to the first mode of operation at the half-wave zero-crossing point of the next cycle.
14. A drive control method is suitable for a drive control circuit, the drive control circuit is provided with at least one switch device, and the switch device is configured to control a power supply signal to supply power to a load, wherein the drive control method includes:

    Detecting the power supply signal, and determining the minimum value of the given current in the second mode according to the rate of change of the power supply signal;

    Comparing the magnitude relationship between the power supply signal and the power supply signal threshold;

    Controlling the switching device to work in the first mode or the second mode according to the magnitude relationship,

    Wherein, the first mode is configured as a mode in which the switching device is turned off, and the second mode is configured as a mode in which the switching device operates according to a specified pulse drive signal, so that the operation in the second mode is The constant current follows the AC voltage input to the load.
15. The driving control method according to claim 14, wherein detecting the power supply signal and determining the minimum value of the given current in the second mode according to the rate of change of the power supply signal specifically comprises:

    In the second mode, determine the bus signal, AC voltage, and AC current contained in the power supply signal in real time;

    Calculating the difference between the bus signal and the given bus signal, and the rate of change of the bus signal is configured to be able to determine the minimum value of the given current;

    Inputting the difference between the bus signal and the given bus signal to a first PI controller, the first PI controller being configured to be able to output a given current in the second mode;

    Inputting the given current, the alternating voltage and the alternating current after the limiting processing to the second PI controller, and the second PI controller is configured to be able to output the driving pulse driving signal,

    Wherein, the given current is configured to control the rise of the bus signal.
16. The drive control method according to claim 14 or 15, wherein, according to the magnitude relationship between the power supply signal in the next cycle and the third power supply signal threshold, the switching device is controlled to switch to the The first mode of work includes:

    Predicting the bus signal in the next cycle, and determining that the first zero-crossing point of the next cycle is a half-wave zero-crossing point or a full-wave zero-crossing point;

    If the first zero-crossing point is the full-wave zero-crossing point, determining whether the bus signal corresponding to the full-wave zero-crossing point is greater than or equal to the third bus signal threshold in the power supply signal threshold;

    If the bus signal corresponding to the full-wave zero-crossing point is greater than or equal to the third bus signal threshold, the switching device is controlled to switch to the first mode of operation at the full-wave zero-crossing point of the next cycle.
17. The driving control method according to any one of claims 14 to 16, wherein, according to the magnitude relationship between the power supply signal in the next cycle and the third power supply signal threshold, the switching device is controlled to be at a specified time Switching to the first mode of work specifically includes:

    Predicting the bus signal in the next cycle, and determining that the first zero-crossing point of the next cycle is a half-wave zero-crossing point or a full-wave zero-crossing point;

    If the first zero-crossing point is the half-wave zero-crossing point, determining whether the bus signal corresponding to the half-wave zero-crossing point is greater than or equal to the fourth bus signal threshold in the power supply signal threshold;

    If the bus signal corresponding to the half-wave zero-crossing point is greater than or equal to the fourth bus signal threshold, the switching device is controlled to switch to the first mode of operation at the half-wave zero-crossing point of the next cycle.
18. The drive control method according to any one of claims 1 to 17, wherein:

    The drive control circuit also includes a capacitive element connected between the switching device and the load, and the capacitive element includes a plurality of series and/or parallel electrolytic capacitors, or the Capacitive components include multiple series and/or parallel film capacitors,

    The operation control method further includes:

    The second bus signal threshold is determined according to the withstand voltage threshold of the capacitive element and the withstand voltage threshold of the switching device.
19. The drive control method according to any one of claims 1 to 18, 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 the power of the load, the difference being configured as the charging power;

    Determining the rate of change of the bus signal according to the charging power;

    Determine the minimum value of the given current in the second mode according to the rate of change of the bus signal,

    Wherein, the given current is configured to control the rise of the bus signal.
20. A drive control device, the drive control device includes a processor, wherein when the processor executes a computer program:

    The step of the drive control method according to any one of claims 1 to 19.
21. A household electrical appliance, including:

    load;

    The drive control device according to claim 20;

    A drive control circuit, the drive control circuit is controlled by the drive control device, the drive control circuit is provided with a PFC, the PFC has at least one switching device, and the switching device is configured to control a power supply signal to supply power to the load.
22. The household electrical appliance according to claim 21, wherein:

    The home appliance includes at least one of an air conditioner, a refrigerator, a fan, a range hood, a vacuum cleaner, and a computer host.
23. A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the steps of the drive control method according to any one of claims 1 to 19 are realized.

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