WO2020237809A1

WO2020237809A1 - Driving control method and apparatus, and household device and computer readable storage medium

Info

Publication number: WO2020237809A1
Application number: PCT/CN2019/097556
Authority: WO
Inventors: 文先仕; 黄招彬; 曾贤杰; 张杰楠
Original assignee: 广东美的制冷设备有限公司; 美的集团股份有限公司
Priority date: 2019-05-31
Filing date: 2019-07-24
Publication date: 2020-12-03

Abstract

The present application provides a driving control method and apparatus, and a household device and a computer readable storage medium. The driving control method comprises: detecting a running current, input to a load, in a power supply signal, and recording an input duration of the running current; and controlling a switch device to operate in a first mode or a second mode according to the running current and the input duration, wherein the first mode is configured as a mode for controlling the cut-off of the switch device, and the second mode is configured as a mode in which the switch device operates according to a specified pulse driving signal, so that the running current in the second mode follows an AC voltage input to the load. According to the technical solution of the present application, the working efficiency of the driving load is improved, and the circuit power consumption and hardware loss are reduced.

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 on May 31, 2019, the application number is 201910472267.3, and the invention title is "driving control methods, devices, household appliances, and computer-readable storage media". 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 201910473276.4, and the invention title is "drive control methods, devices, household appliances, and computer-readable storage media", all of which are 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 the efficiency of the Boost PFC module. However, the bridgeless totem pole PFC module usually works in high frequency or power frequency mode, which not only causes 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 operating current input to the load in the power supply signal, and recording the input duration of the operating current; The operating current and the input duration are used to control the switching device to work in a first mode or a second mode, wherein the first mode is configured to control the switching device to turn off, and the second mode is configured It is a mode in which the switching device operates according to a designated pulse driving signal, so that the given current in the second mode follows the AC voltage input to the load.

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

In this technical solution, by recording the input duration of the operating current, and according to the operating current and the input duration, the switching device is controlled to work in the first mode or the second mode, for example, the power supply signal is periodic The signal, according to the input duration, controls the switching device to switch the mode, which can improve the energy efficiency of the load while reducing the calculation amount of the drive control scheme.

In addition, the power supply signal includes the AC voltage before rectification and the bus voltage after rectification. The detected 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, so that the switch can be switched more accurately The operating mode of the device, and determining the switching moment in combination with the trend of the alternating voltage over time, wherein the first mode is configured to control the switching device to turn off, and in the first mode, stop sending the driving signal to the switching device , In order to reduce the power consumption and hardware loss of the switching device, and with the continuous decrease 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. Accordingly, the second mode It 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 can understand that the normal operation of the load can be guaranteed 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, and the first mode The other switching point between the second mode and the second mode corresponds to the minimum threshold of the bus signal. 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, 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 from the first mode to the second mode is the The zero-crossing point time of the AC signal in the power supply signal, where 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.

Optionally, the operating current is an AC current input from the power grid system, or a current signal at a designated position in the drive control circuit.

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

In any of the above technical solutions, optionally, before detecting the operating current corresponding to the power supply signal and recording the input duration of the operating current, the method further includes: presetting the operating current in the first mode The first current threshold and the second current threshold of, the first current threshold is less than the second current threshold; the operating time threshold in the first mode is preset according to the operating current.

In this technical solution, by setting the preset first current threshold and second current threshold of the operating current in the first mode, and the working duration threshold in the first mode, it can be based on the input duration and the first mode The lower working time threshold can more reliably control the second switching device to switch to the second mode.

In any of the above technical solutions, optionally, controlling the switching device to operate in the first mode or the second mode according to the operating current and the input duration includes: the switching device operates in the first mode A mode of operation, comparing the magnitude relationship between the operating current and the first current threshold, and comparing the magnitude relationship between the operating current and the second current threshold; determining that the operating current is less than the first current threshold Two current thresholds, and the operating current is greater than the first current threshold, according to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate from the first mode or switch to The second mode works.

In this technical solution, the switching device operates in the first mode, comparing the magnitude relationship between the operating current and the first current threshold, and comparing the operating current with the second current threshold. The relationship between the magnitude and magnitude of the switching device is further controlled to operate from the first mode or switch to the second mode, avoiding the possibility of the load stalling due to the bus voltage drop.

In any of the above technical solutions, optionally, the moment of switching from the first mode to the second mode is a zero-crossing moment of the AC signal in the power supply signal.

In this technical solution, the switching time from the first mode to the second mode is the zero-crossing point of the AC signal in the power supply signal, which can effectively reduce current harmonics.

In any of the above technical solutions, optionally, before detecting the operating current corresponding to the power supply signal and recording the input duration of the operating current, the method further includes: presetting the operating current in the second mode The third current threshold and the fourth current threshold of, the third current threshold is less than the fourth current threshold; the operating time threshold in the second mode is preset according to the operating current.

In this technical solution, by presetting the third current threshold value and the fourth current threshold value of the operating current in the second mode, the third current threshold value is less than the fourth current threshold value, and according to the operation The current presets the operating time threshold in the second mode, and then combines the operating current and the input time to control the switching device to switch from the second mode to the first mode in time, which is beneficial to further reduce the power consumption of the switching device, thereby increasing the load efficiency.

In any of the above technical solutions, optionally, controlling the switching device to operate in the first mode or the second mode according to the operating current and the input duration, and specifically further includes: the switching device operates in the Working in the second mode, comparing the magnitude relationship between the operating current and the third current threshold, and comparing the magnitude relationship between the operating current and the fourth current threshold; determining that the operating current is less than the A fourth current threshold, and the operating current is greater than the third current threshold, according to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate from the second mode or switch to The first mode works.

In this technical solution, the switching device operates in the second mode, and the bus voltage is pulled up. Further, by determining that the operating current is less than the fourth current threshold, and the operating current is greater than the first Three current thresholds, according to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate in the second mode or switch to the first mode to operate, so as to avoid excessive bus voltage hits Wear capacitive components or switching devices to further improve load energy efficiency.

In any of the above technical solutions, optionally, the switching time from the second mode to the first mode is the zero-crossing point of the AC signal in the power supply signal.

In this technical solution, the switching time from the second mode to the first mode is the zero-crossing point of the AC signal in the power supply signal, which can also effectively reduce current harmonics.

In any of the above technical solutions, 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 that are alternately distributed, and the work cycle corresponding to the first mode It includes an integer number of half-cycle durations, and/or the duty cycle corresponding to the second mode includes an integer number of the half-cycle durations, where the half-cycle duration includes the duration of the positive half-cycle signal and the negative half-cycle signal The duration of time.

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.

In the technical solution of the second aspect of the present application, a drive control method is proposed, which includes: detecting the AC voltage input to the load in the power supply signal, and recording the input duration of the AC voltage; The AC voltage and the input duration are used to control the switching device to operate in a first mode or a second mode, wherein the first mode is configured to control the switching off of the switching device, and the second mode is configured It is a mode in which the switching device operates according to a designated pulse driving signal, so that the given current in the second mode follows the AC voltage input to the load.

In this technical solution, by recording the input duration of the AC voltage, and according to the AC voltage and the input duration, the switching device is controlled to work in the first mode or the second mode, for example, the power supply signal is periodic The signal, according to the input duration, controls the switching device for mode switching, which can improve the energy efficiency of the load while reducing the calculation amount of the drive control scheme.

Those skilled in the art can understand that the normal operation of the load can be guaranteed 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, and the first mode The other switching point between the second mode and the second mode corresponds to the minimum threshold of the bus signal. 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, as far as possible 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 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 improves the performance of the drive control circuit. Reliability and service life.

Optionally, the AC voltage is the AC current input by the power grid system, or it may be a current signal at a designated position in the drive control circuit.

In any of the above technical solutions, optionally, before detecting the AC voltage corresponding to the power supply signal and recording the input duration of the AC voltage, the method further includes: presetting the AC voltage in the first mode The first voltage threshold and the second voltage threshold of, the first voltage threshold is less than the second voltage threshold; the operating duration threshold in the first mode is preset according to the AC voltage.

In this technical solution, by setting the preset first voltage threshold and second voltage threshold of the AC voltage in the first mode, and the working duration threshold in the first mode, it can be based on the input duration and the first mode The lower working duration threshold can more reliably control the second switching device to switch to the second mode.

In any of the above technical solutions, optionally, controlling the switching device to operate in the first mode or the second mode according to the AC voltage and the input duration includes: the switching device operates in the first mode A mode of operation, comparing the magnitude relationship between the AC voltage and the first voltage threshold, and comparing the magnitude relationship between the AC voltage and the second voltage threshold; determining that the AC voltage is less than the first voltage threshold Two voltage thresholds, and the AC voltage is greater than the first voltage threshold, according to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate from the first mode or switch to all The second mode is described.

In this technical solution, the switching device operates in the first mode, compares the magnitude relationship between the AC voltage and the first voltage threshold, and compares the AC voltage with the second voltage threshold. The relationship between the magnitude and magnitude of the switching device is further controlled to operate from the first mode or to switch to the second mode, avoiding the possibility of the load stalling due to the bus voltage drop.

In any of the above technical solutions, optionally, before detecting the AC voltage corresponding to the power supply signal and recording the input duration of the AC voltage, the method further includes: presetting the AC voltage in the second mode The third voltage threshold and the fourth voltage threshold of, the third voltage threshold is less than the fourth voltage threshold; the operating duration threshold in the second mode is preset according to the AC voltage.

In this technical solution, by presetting the third voltage threshold and the fourth voltage threshold of the AC voltage in the second mode, the third voltage threshold is smaller than the fourth voltage threshold, and according to the AC The voltage presets the operating time threshold in the second mode, and then combines the AC voltage and the input time to control the switching device to switch from the second mode to the first mode in time, which is beneficial to further reduce the power consumption of the switching device, thereby increasing the load efficiency.

In any of the above technical solutions, optionally, controlling the switching device to operate in the first mode or the second mode according to the AC voltage and the input duration, and specifically further includes: the switching device operates in the Working in the second mode, comparing the magnitude relationship between the AC voltage and the third voltage threshold, and comparing the magnitude relationship between the AC voltage and the fourth voltage threshold; determining that the AC voltage is less than the A fourth voltage threshold, and the AC voltage is greater than the third voltage threshold, according to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate from the second mode or switch to The first mode works.

In this technical solution, the switching device operates in the second mode, and the bus voltage is pulled high. Further, by determining that the AC voltage is less than the fourth voltage threshold, and the AC voltage is greater than the first Three voltage thresholds, according to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate in the second mode or switch to the first mode to operate, so as to avoid excessive bus voltage hitting Through capacitive components or switching devices, the load energy efficiency is further improved.

In the technical solution of the third 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 of the drive control methods described above, which will not be repeated here.

In the technical solution of the fourth 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 third aspect of the present application; 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 this technical solution, the home appliance includes the drive control device as described in the above technical solution. Therefore, the home appliance includes all the beneficial effects of the drive control device as described in the above technical solution, which will not be repeated again.

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

In the technical solution of the fifth 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 diagram of a driving control current according to an embodiment of the present application;

Fig. 3 shows a schematic diagram of driving control current according to another embodiment of the present application;

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

Figure 5 shows a schematic diagram of a drive control scheme according to an embodiment of the present application;

Fig. 6 shows a timing diagram of a driving control method according to an embodiment of the present application;

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

Fig. 8 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 with reference to 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 subject to 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 operating current input to the load in the power supply signal, and recording the input duration of the operating current; step S104 , Controlling the switching device to operate in a first mode or a second mode according to the operating current and the input duration, wherein the first mode is configured to control the switching device to be turned off, and the first mode 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.

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 that are alternately distributed, and the switching time from the first mode to the second mode is the The zero-crossing point time of the AC signal in the power supply signal, where the zero-crossing point time is a transition time between the adjacent positive half-cycle signal and the negative half-cycle signal.

In any of the above technical solutions, optionally, controlling the switching device to operate in the first mode or the second mode according to the operating current and the input duration, specifically including: the switching device operates in the first mode A mode of operation, comparing the magnitude relationship between the operating current and the first current threshold, and comparing the magnitude relationship between the operating current and the second current threshold; determining that the operating current is less than the first current threshold Two current thresholds, and the operating current is greater than the first current threshold, according to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate from the first mode or switch to The second mode is described.

In this technical solution, by presetting the third current threshold and the fourth current threshold of the operating current in the second mode, the third current threshold is smaller than the fourth current threshold, and according to the operation The current presets the operating time threshold in the second mode, and then combines the operating current and the input time to control the switching device to switch from the second mode to the first mode in time, which is beneficial to further reduce the power consumption of the switching device, thereby increasing the load efficiency.

In this technical solution, the switching device operates in the second mode, and the bus voltage is pulled high. Further, by determining that the operating current is less than the fourth current threshold, and the operating current is greater than the first Three current thresholds, according to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate in the second mode or switch to the first mode to operate, so as to avoid excessive bus voltage hits Through capacitive components or switching devices, the energy efficiency of the load is further improved.

As shown in FIG. 2, the drive control method according to an embodiment of the present application includes: step S202, detecting the AC voltage input to the load in the power supply signal, and recording the input duration of the AC voltage; step S204 , Controlling the switching device to work in a first mode or a second mode according to the AC voltage and the input duration, wherein the first mode is configured to control the switching device to turn off, and the first mode 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 any of the above technical solutions, optionally, before detecting the AC voltage corresponding to the power supply signal and recording the input duration of the AC voltage, the method further includes: presetting the AC voltage in the second mode The third voltage threshold and the fourth voltage threshold of, the third voltage threshold is smaller than the fourth voltage threshold; the operating duration threshold in the second mode is preset according to the AC voltage.

In this technical solution, by presetting the third voltage threshold and the fourth voltage threshold of the AC voltage in the second mode, the third voltage threshold is less than the fourth voltage threshold, and according to the AC The voltage presets the operating time threshold in the second mode, and then combines the AC voltage and the input time to control the switching device to switch from the second mode to the first mode in time, which is beneficial to further reduce the power consumption of the switching device, thereby increasing the load efficiency.

In this technical solution, the switching device operates in the second mode, and the bus voltage is pulled high. Further, by determining that the AC voltage is less than the fourth voltage threshold, and the AC voltage is greater than the first Three voltage thresholds, according to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate in the second mode or switch to the first mode to operate, so as to avoid excessive bus voltage hitting Through capacitive components or switching devices, the energy efficiency of the load is further improved.

In any of the above technical solutions, optionally, the moment of switching from the second mode to the first mode is the zero-crossing point of the AC signal in the power supply signal.

In any one 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; 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.

As shown in FIG. 3, 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, 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, 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, it is determined that the switching tube is working in the second mode, and 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 to output pulse drive signals to the switch tube or stop outputting pulse drive signals 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, and the bus voltage is lower than the minimum threshold V _{dc_min of the} bus signal, and output to the switch tube The pulse drive signal is switched to the second mode of work, that is, the switch tube is in working state, so that the given current I _{S is} close to the sine wave waveform.

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

As shown in FIG. 4, 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: a bridgeless totem pole PFC module, a 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 component 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 phase difference between AC voltage and AC current, but also solve the electromagnetic interference and electromagnetic compatibility problems caused by harmonic signals. 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 , where 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 the driving load is detected When the power demand 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.

As shown in Figure 5, 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, in the same way, 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 drive 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 6 and Figure 7, 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, 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, it is determined that the switch tube is working in the second mode, and the relationship between the bus voltage V _dc and the maximum threshold V _{dc_max} of the bus signal, and the relationship between the bus voltage V _dc and the minimum threshold V _{dc_min of the} bus signal are _{further combined} . The size relationship is to control the output of pulse drive signal to the switch tube or stop the output of pulse drive signal to the switch tube.

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

6, the timing of switching between the first mode and the second mode is a zero-crossing time of the AC signal U _S, to further reduce the harmonic signals in the drive control 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 7, 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 Figure 8, according to the sampling value of the bus voltage, it is determined that at the time T ₁₂ corresponding to a full-wave zero-crossing point, the first mode is switched 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 The relationship between the magnitude of _{dc_max} , determine that the predicted value of the first bus voltage V _{dc_pre1 is} less than the maximum threshold of the bus signal V _{dc_max} , continue to work in the second mode, and predict the first bus voltage based on the next full-wave zero-crossing bus signal sampling value V _{dc_cur} prediction value _V dc_pre2, comparing the second bus voltage prediction value _V dc_pre2 the bus signal maximum threshold _V dc_max magnitude relationship, determining a second bus voltage prediction value _V dc_pre2 close bus signal maximum threshold _V dc_max, i.e. the maximum threshold bus signal The difference between V _{dc_max} and the second bus voltage predicted value V _{dc_pre2} is less than the difference threshold, and it is determined to switch to the first mode at time T ₂₁ corresponding to another full-wave zero-crossing point.

The household appliance according to the 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 that the load can operate normally, the bus can be 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 action switch state, which can reduce the power consumption of the power factor correction module in the drive control circuit, so as to improve the electrical equipment (such as air conditioner) 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), 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.

Through the technical solution of the present application, by recording the input duration of the operating current, and according to the operating current and the input duration, the switching device is controlled to work in the first mode or the second mode, for example, the power supply signal is a period The performance signal, according to the input duration, controls the switching device to switch the mode, which can improve the energy efficiency of the load while reducing the calculation amount of the drive control scheme.

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, this 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, devices (systems), and computer program products according to 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 can be generated It is a device that 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 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 implemented by means of hardware including different components and by means of a suitably programmed computer. In the unit claims listing dry devices, each 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 preferred 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 the preferred embodiments and all changes and modifications falling within the scope of this application.

The above are only preferred 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 originality of this application shall be included in the protection scope of this application.

Claims

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 operating current input to the load in the power supply signal, and recording the input duration of the operating current;

Controlling the switching device to work in the first mode or the second mode according to the operating current and the input duration,

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 input in the second mode The current follows the AC voltage input to the load.
The drive control method according to claim 1, wherein before detecting the operating current corresponding to the power supply signal and recording the input time length of the operating current, the method further comprises:

Preset a first current threshold and a second current threshold of the operating current in the first mode, where the first current threshold is smaller than the second current threshold;

The operating duration threshold in the first mode is preset according to the operating current.
The driving control method according to claim 2, wherein, according to the operating current and the input duration, controlling the switching device to operate in the first mode or the second mode specifically includes:

Operating the switching device in the first mode, comparing the magnitude relationship between the operating current and the first current threshold, and comparing the magnitude relationship between the operating current and the second current threshold;

Determining that the operating current is less than the second current threshold, and the operating current is greater than the first current threshold;

According to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate in the first mode or switch to the second mode to operate.
The drive control method according to any one of claims 1 to 3, wherein:

The time of switching from the first mode to the second mode is the zero-crossing time of the AC signal in the power supply signal.
The drive control method according to any one of claims 1 to 4, wherein before detecting the operating current corresponding to the power supply signal and recording the input duration of the operating current, the method further comprises:

Preset a third current threshold and a fourth current threshold of the operating current in the second mode, where the third current threshold is smaller than the fourth current threshold;

The operating duration threshold in the second mode is preset according to the operating current.
The driving control method according to claim 5, wherein, according to the operating current and the input duration, controlling the switching device to operate in the first mode or the second mode, specifically further comprising:

Operating the switching device in the second mode, comparing the magnitude relationship between the operating current and the third current threshold, and comparing the magnitude relationship between the operating current and the fourth current threshold;

Determining that the operating current is less than the fourth current threshold, and the operating current is greater than the third current threshold;

According to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate in the second mode or switch to the first mode to operate.
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 AC voltage input to the load in the power supply signal, and recording the input duration of the AC voltage;

Controlling the switching device to work in the first mode or the second mode according to the AC voltage and the input duration,

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 input in the second mode The current follows the AC voltage input to the load.
8. The drive control method according to claim 7, wherein before detecting the AC voltage corresponding to the power supply signal and recording the input time length of the AC voltage, the method further comprises:

Preset a first voltage threshold and a second voltage threshold of the AC voltage in the first mode, the first voltage threshold being smaller than the second voltage threshold;

The operating duration threshold in the first mode is preset according to the AC voltage.
The driving control method according to claim 8, wherein, according to the AC voltage and the input duration, controlling the switching device to operate in the first mode or the second mode specifically includes:

The switching device operates in the first mode, and determines the bus voltage obtained by rectifying and converting the AC voltage;

Comparing the magnitude relationship between the bus voltage and the first voltage threshold, and comparing the magnitude relationship between the bus voltage and the second voltage threshold;

Determining that the bus voltage is less than the second voltage threshold, and the bus voltage is greater than the first voltage threshold;

According to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate in the first mode or switch to the second mode to operate.
The drive control method according to any one of claims 7 to 9, wherein:

The time of switching from the first mode to the second mode is the zero-crossing time of the AC signal in the power supply signal.
The drive control method according to any one of claims 7 to 10, wherein before detecting the AC voltage corresponding to the power supply signal and recording the input time length of the AC voltage, the method further comprises:

Preset a third voltage threshold and a fourth voltage threshold of the AC voltage in the second mode, the third voltage threshold being smaller than the fourth voltage threshold;

The operating duration threshold in the second mode is preset according to the AC voltage.
The driving control method according to claim 11, wherein, according to the AC voltage and the input duration, controlling the switching device to operate in the first mode or the second mode, specifically further comprising:

The switching device operates in the second mode, comparing the magnitude relationship between the AC voltage and the third voltage threshold, and comparing the magnitude relationship between the AC voltage and the fourth voltage threshold;

Determining that the AC voltage is less than the fourth voltage threshold, and the AC voltage is greater than the third voltage threshold;

According to the magnitude relationship between the input duration and the corresponding operating duration threshold, the switching device is controlled to operate in the second mode or switch to the first mode to operate.
The drive control method according to any one of claims 1 to 12, wherein:

The time of switching from the second mode to the first mode is the zero-crossing point of the AC signal in the power supply signal.
The drive control method according to any one of claims 1 to 13, wherein:

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

The work period corresponding to the first mode includes an integer number of half-cycle durations, and/or the work period corresponding to the second mode includes an integer number of the half-cycle durations,

Wherein, the half-cycle duration includes the duration of the positive half-cycle signal and the duration of the negative half-cycle signal.
The drive control method according to any one of claims 1 to 14, 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 a given current in the second mode;

Calculating a difference between the input power and the power of the load, the difference being configured as 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.
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 15.
A household electrical appliance, including:

load;

The drive control device according to claim 16;

A drive control circuit, the drive control circuit is controlled by the drive control device, the drive control circuit is provided with at least one switching device, and the switching device is configured to control a power supply signal to supply power to the load.
The household electrical appliance according to claim 17, 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.
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 15 are realized.