JP7261909B2 - Operation control method, circuit, home appliance and computer readable storage medium - Google Patents

Description

This application is a Chinese patent with application number 2019104732779, filed with the Chinese Patent Office on May 31, 2019, titled "Operation control method, circuit, home appliance and computer-readable storage medium" Claiming priority of an application, the entire contents of which are incorporated into this application by reference.
In addition, the present application is filed with the Chinese Patent Office on May 31, 2019, the application number is 2019104732798, and the title of the invention is "operation control method, circuit, home appliance and computer-readable storage medium". Claiming priority of a Chinese patent application, the entire content of which is incorporated into this application by reference.

TECHNICAL FIELD The present application relates to the field of drive control, and more particularly to drive control methods, drive control circuits, home appliances, and computer-readable storage media.

PFC (Power Factor Correction) technology is widely applied to drive control circuits, and its main role is to improve the power usage efficiency of electrical equipment (loads).

In the related art, PWM (Pulse-Width Modulation) is generally used to drive a switching transistor to turn on or off, and commonly used PFC modules are Boost type PFC modules and Two PFC modules, including a bridgeless totem-pole PFC module, have at least the following technical problems when driving a load to run.

(1) The Boost-type PFC module has a simple circuit configuration, ie, it controls the charging and discharging process of the inductor through the switching transistor, but the efficiency of the Boost-type PFC module is low and the switching loss is large.

(2) Bridgeless totem-pole PFC modules are more efficient than Boost PFC modules. However, in general, bridgeless totem-pole PFC modules operate at high frequencies, but the high-frequency method is suitable only for high loads, and when the load is small, the conduction losses of the switching transistors increase and efficiency decreases. . This not only increases the hardware loss of the drive control circuit and power consumption, but also does not help to further improve the energy efficiency of the load.

Any discussion of background art throughout this specification does not necessarily indicate that such background art is prior art known to those of ordinary skill in the art, and any discussion of background art throughout this specification does not necessarily imply such prior art. It is not intended to imply that the technology is considered to be widely known in the art or constitutes common knowledge in the art.

The present application aims at solving at least one of the technical problems existing in the prior art or related art.

Therefore, one object of the present application is to provide an operation control method.

Another object of the present application is to provide a drive control circuit.

A further object of the present application is to provide a consumer electronic device.

A further object of the present application is to provide a computer-readable storage medium.

The operation control method provided in the technical means of the first aspect of the present application includes steps of obtaining an operation parameter of a load, comparing the magnitude relationship between the operation parameter and an operation parameter threshold, and and controlling the power factor correction module to operate in a first mode or a second mode according to the magnitude relationship with the operating parameter threshold, wherein the first mode is the power factor correction module according to an AC signal. The second mode is set to control the ON state of the switching transistor, and the second mode is set to control the ON state of the switching transistor according to a power supply signal.

In this technical means, by obtaining the operating parameters of the load, the operating parameters can represent the operating state of the load and the power required. Further, based on the magnitude relationship between the operating parameter and the operating parameter threshold, the power factor correction module is controlled to operate in the first mode or the second mode, and the first mode is a low load (for example, when the load is full). The second mode is suitable for driving high-load operation (for example, the load amount reaches 50% of the full load condition), and the second mode The state of the switching transistor in the mode includes an active state and a non-operating state, and the switching transistor does not operate in the non-operating state. As a result, it is possible not only to meet the power required for load operation, but also to further reduce circuit loss and power consumption, thereby helping to further improve the energy efficiency of load operation.

The driving parameter threshold is generally determined by combining the power supply signal and the hardware characteristics of the drive control circuit, and the hardware characteristics mainly include the withstand voltage value of the switching transistor and the withstand voltage value of the capacitive element. be

selectably, the load is a single-phase motor or a three-phase motor, a drive control circuit is connected between the load and the grid system, the drive control circuit sequentially comprising a power factor correction module, a capacitive element and an inverter; The power factor correction module is a Boost type PFC module or a bridgeless totem pole type PFC module. The input side of the Boost type PFC module is usually provided with a rectifier bridge, the bridgeless totem-pole type PFC module does not need to be provided with a rectifier bridge, and the above two types of mainstream PFC modules are used for the second mode. If so, the energy efficiency of the circuit can be further improved, and it also helps to further reduce spike and surge signals in the circuit.

Alternatively, the first mode corresponds to a synchronous rectification mode, ie switching transistors with a very low on-resistance are used instead of rectifier diodes. In particular, under low voltage, high current drive control requirements (low load), the on-voltage drop of the rectifier diode is large, generally 0.6 V to 1.2 V, resulting in large circuit losses and power supply efficiency. becomes lower. On the other hand, when the switching transistor turns on, the voltage-current characteristic shows a linear characteristic, and the driving voltage of the gate (or base) of the switching transistor is synchronized with the AC voltage to achieve synchronous rectification and drive a light load. It is more suitable to operate with a constant voltage, further improving the efficiency of the power supply.

The operation control method provided in the technical means of the second aspect of the present application includes steps of obtaining an operation parameter of a load, comparing the magnitude relationship between the operation parameter and an operation parameter threshold, and and controlling the power factor correction module to operate in a first mode or a second mode depending on the magnitude relationship with the operating parameter threshold, the first mode being turned on or off according to a predetermined duty cycle. and the second mode is set to control the ON state of the switching transistor according to the power supply signal.

In this technical means, by obtaining the operating parameters of the load, the operating parameters can represent the operating state of the load and the power required. Also, based on the magnitude relationship between the operating parameter and the operating parameter threshold, the power factor correction module is controlled to operate in the first mode or the second mode. The first mode is suitable for driving high loads (e.g. load reaches 50% of full load) and the second mode is low load (e.g. load does not reach 50% of full load). ), the state of the switching transistor in the second mode includes an active state and a non-operating state, and the switching transistor does not operate in the non-operating state. As a result, it is possible not only to meet the power required for load operation, but also to further reduce circuit loss and power consumption, thereby helping to further improve the energy efficiency of load operation.

A drive control circuit provided in a third aspect of the present application comprises: a controller arranged to execute the steps of the operation control method according to any one of the above items; and a power factor correction module including a switching transistor arranged to power a load.

In this technical means, the drive control circuit is provided with a controller, and the controller is arranged to execute the steps of the operation control method described in any one of the above technical means, so that the drive control circuit , includes all the beneficial effects of the operation control method described in any one of the above technical means, and will not be repeated here.

Selectably, the controller is one of a MCU (Micro-programmed Control Unit), a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and an embedded device. may be, but is not limited to.

A home appliance provided in a fourth aspect of the present application includes a load, and the drive control circuit according to any one of the above technical means arranged to control a power supply signal to supply power to the load. .

In this technical means, the home appliance includes the drive control circuit according to any one of the technical means above, so that the home appliance includes all of the drive control circuit according to any one of the technical means above. Contains beneficial effects and will not be repeated here.

In the above technical means, optionally, the home appliances include at least one of air conditioners, refrigerators, fans, range hoods, vacuum cleaners and computer hosts.

A fifth aspect of the present application provides a computer-readable storage medium storing a computer program, and when the computer program is executed, the operation control method according to any one of the above technical means is performed. steps are realized.

Additional aspects and advantages of the present application will become apparent from the following description, or may be learned through practice of the present application.

The above and/or additional aspects and advantages of the present application will become apparent and comprehensible from the following description of embodiments with reference to the drawings.

4 is a flow chart of an operation control method according to an embodiment of the present application; 4 is a flow chart of an operation control method according to another embodiment of the present application; 1 is a schematic diagram of a drive control circuit according to an embodiment of the present application; FIG. FIG. 4 is a schematic diagram of a drive control circuit according to another embodiment of the present application; 4 is a timing chart of an operation control method according to another embodiment of the present application; 4 is a timing chart of an operation control method according to another embodiment of the present application; 4 is a timing chart of an operation control method according to another embodiment of the present application;

To better understand the above objects, features and advantages of the present application, the present application will now be described in more detail in conjunction with the drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application can be combined with each other unless there is a contradiction.

Although the following description provides many details for a thorough understanding of the present application, the present application may be embodied in different forms than those described herein, and the scope of protection of the present application is disclosed below. It is not limited to specific examples.

(Example 1)
FIG. 1 is a flow chart of an operation control method according to an embodiment of the present application.

As shown in FIG. 1, an operation control method according to an embodiment of the present application includes step S102 of acquiring an operation parameter of a load and comparing the magnitude relationship between the operation parameter and an operation parameter threshold; and a step S104 of controlling the power factor correction module to operate in a first mode or a second mode according to the magnitude relationship with the operating parameter threshold, wherein the first mode is the power factor correction module according to an AC signal. and the second mode is set to control the ON state of the switching transistor according to a power supply signal.

In this technical means, by obtaining the operating parameters of the load, the operating parameters can represent the operating state of the load and the power required. Further, based on the magnitude relationship between the operating parameter and the operating parameter threshold, the power factor correction module is controlled to operate in the first mode or the second mode, and the first mode is a low load (for example, when the load is full). The second mode is suitable for driving high-load operation (for example, the load amount reaches 50% of the full load condition), and the second mode The state of the switching transistor in the mode includes an active state and a non-operating state, and the switching transistor does not operate in the non-operating state. As a result, it is possible not only to meet the power required for load operation, but also to further reduce circuit loss and power consumption, thereby helping to further improve the energy efficiency of load operation.

The driving parameter threshold is generally determined by combining the power supply signal and the hardware characteristics of the drive control circuit, and the hardware characteristics mainly include the withstand voltage value of the switching transistor and the withstand voltage value of the capacitive element. be

selectably, the load is a single-phase motor or a three-phase motor, a drive control circuit is connected between the load and the grid system, the drive control circuit sequentially comprising a power factor correction module, a capacitive element and an inverter; The power factor correction module is a Boost type PFC module or a bridgeless totem pole type PFC module. The input side of the Boost type PFC module is usually provided with a rectifier bridge, the bridgeless totem-pole type PFC module does not need to be provided with a rectifier bridge, and the above two types of mainstream PFC modules are used for the second mode. If so, the energy efficiency of the circuit can be further improved, and it also helps to further reduce spike and surge signals in the circuit.

Alternatively, the first mode corresponds to a synchronous rectification mode, ie switching transistors with a very low on-resistance are used instead of rectifier diodes. In particular, under low voltage, high current drive control requirements (low load), the on-voltage drop of the rectifier diode is large, generally 0.6 V to 1.2 V, resulting in large circuit losses and power supply efficiency. becomes lower. On the other hand, when the switching transistor turns on, the voltage-current characteristic shows a linear characteristic, and the driving voltage of the gate (or base) of the switching transistor is synchronized with the AC voltage to achieve synchronous rectification and drive a light load. It is more suitable to operate with a constant voltage, further improving the efficiency of the power supply.

(Example 2)
FIG. 2 is a flow chart of an operation control method according to another embodiment of the present application.

As shown in FIG. 2, an operation control method according to another embodiment of the present application includes step S202 of acquiring an operation parameter of a load and comparing the magnitude relationship between the operation parameter and an operation parameter threshold; and a step S204 of controlling the power factor correction module to operate in a first mode or a second mode according to the magnitude relationship with the operating parameter threshold, wherein the first mode is on or off according to a predetermined duty cycle. The switching transistor is set to control the switching transistor to be turned off, and the second mode is set to control the ON state of the switching transistor according to a power supply signal.

In this technical means, by obtaining the operating parameters of the load, the operating parameters can represent the operating state of the load and the power required. Also, based on the magnitude relationship between the operating parameter and the operating parameter threshold, the power factor correction module is controlled to operate in the first mode or the second mode. The first mode is suitable for driving high loads (e.g. load reaches 50% of full load) and the second mode is low load (e.g. load does not reach 50% of full load). ), the state of the switching transistor in the second mode includes an active state and a non-operating state, and the switching transistor does not operate in the non-operating state. This not only satisfies the power required for load operation, but also further reduces circuit loss and power consumption, which helps to further improve the energy efficiency of load operation.

The driving parameter threshold is generally determined by combining the power supply signal and the hardware characteristics of the drive control circuit, and the hardware characteristics mainly include the withstand voltage value of the switching transistor and the withstand voltage value of the capacitive element. be

selectably, the load is a single-phase motor or a three-phase motor, a drive control circuit is connected between the load and the grid system, the drive control circuit sequentially comprising a power factor correction module, a capacitive element and an inverter; The power factor correction module is a Boost type PFC module or a bridgeless totem pole type PFC module. The input side of the Boost type PFC module is generally provided with a rectifier bridge, and the bridgeless totem-pole type PFC module does not need to be provided with a rectifier bridge, and the above two types of mainstream PFC modules are applied to the second mode. If so, the energy efficiency of the circuit can be further improved, and it also helps to further reduce spike and surge signals in the circuit.

In addition, the operation control method according to the above embodiments of the present application may have the following technical features attached.

In the above technical means, the step of selectively acquiring the operating parameter of the load and comparing the magnitude relationship between the operating parameter and the operating parameter threshold is specifically performed at a predetermined time interval, the current, the power , detecting an operating parameter of the load including at least one of operating pressure and frequency; and comparing the magnitude relationship between the operating parameter and an operating parameter threshold.

The technical means can determine whether the load driven to run is a light load or a heavy load by detecting the operating parameters of the load at predetermined time intervals. In addition, by comparing the magnitude relationship between the operating parameter and the operating parameter threshold, the operating mode of the switching transistor is adjusted, the flexibility and timeliness of the switching transistor adjustment are improved, and the efficiency of the drive control circuit is further improved. useful for that.

Selectably, the predetermined time interval is generally determined based on the load operating frequency.

In any of the above technical means, the step of selectively controlling the power factor correction module to operate in a first mode or a second mode according to the magnitude relationship between the operating parameter and the operating parameter threshold. Specifically, when it is determined that the operating parameter is equal to or lower than the operating parameter threshold, the step of controlling the power factor correction module to operate in the first mode; and controlling the power factor correction module to operate in the second mode if determined to be greater than or equal to a parameter threshold.

In this technical measure, on the one hand, if the operating parameter is determined to be equal to or less than the operating parameter threshold, i.e. the power required for load operation is low, the power factor correction module is operated in the first mode. , and for example operating in synchronous rectification mode, the reliability of the operation of the load can be ensured. on the other hand, when it is determined that the operating parameter is greater than the operating parameter threshold, i.e., the power required for load operation is high, controlling the power factor correction module to operate in the second mode; determines whether to control the switching transistor according to the bus signal to be in the working state or the non-working state, that is, further improve the energy efficiency of the load operation on the premise that the operation of the load is ensured. Let

In any of the above technical means, the step of selectively controlling the power factor correction module to operate in a first mode or a second mode according to the magnitude relationship between the operating parameter and the operating parameter threshold. Specifically, when it is determined that the operating parameter is equal to or greater than the operating parameter threshold, the step of controlling the power factor improvement module to operate in the first mode; and controlling the power factor correction module to operate in the second mode if determined to be less than a parameter threshold.

According to the technical means, on the one hand, if the operating parameter is determined to be greater than or equal to the operating parameter threshold, i.e. the power required for load operation is high, the power factor correction module is operated in the first mode. In other words, by operating the switching transistor according to the specified switching frequency, the reliability of the operation of the load can be guaranteed. on the other hand, if the operating parameter is determined to be less than the operating parameter threshold, i.e., the power required for load operation is low, controlling the power factor correction module to operate in the second mode; determines whether to control the switching transistor according to the bus signal to be in the working state or the non-working state, that is, further improve the energy efficiency of the load operation on the premise that the operation of the load is ensured. Let

In the above technical solution, optionally, the power factor correction module includes a bridge module, and the switching transistors of each arm of the bridge module are sequentially selected as a first switching transistor, a second switching transistor, a third switching transistor and a fourth switching transistor, wherein a common terminal of the first switching transistor and the second switching transistor is connected to a first input circuit for an AC signal; the third switching transistor and the fourth switching transistor; is connected to a second input circuit for said AC signal, said feed signal being converted from said AC signal to a bus signal when rectified by said bridge module, said first switching transistor and said A common terminal of the fourth switching transistor is connected to a high voltage circuit of the bus signal, and a common terminal of the second switching transistor and the third switching transistor is connected to a low voltage circuit of the bus signal.

In the technical solution, the power factor correction module is provided to include a bridge module, and the first switching transistor, the second switching transistor, the third switching transistor and the fourth switching transistor are as described above. A bridgeless totem-pole type PFC module is constructed by connecting to , and has not only a rectifying function but also a circuit power factor adjusting function. When controlling the bridgeless totem-pole type PFC module to operate in the first mode or the second mode, there is a dead time between the ON time of the first switching transistor and the ON time of the second switching transistor. and a dead time between the on-time of the third switching transistor and the on-time of the fourth switching transistor, so that the two switching transistors of the half-bridge circuit are directly connected. In addition to avoiding the generation of spike signals and improving the energy efficiency of load operation, the reliability of the drive control circuit is further improved.

In the above technical means, the step of selectively controlling the power factor correction module to operate in the first mode when it is determined that the operating parameter is equal to or lower than the operating parameter threshold specifically includes: determining whether the AC signal is in a positive half-cycle waveform or a negative half-cycle waveform, if the operating parameter is determined to be less than or equal to the driving parameter threshold; controlling the third switching transistor to turn on and the fourth switching transistor to turn off when in a positive half-cycle waveform; when in a periodic waveform, controlling the fourth switching transistor to turn on and controlling the third switching transistor to turn off.

In this technical measure, the working mode of the power factor correction module in the first mode belongs to the synchronous rectification mode, ie the input signal at the control end of the switching transistor is synchronous with the input AC signal and has a low It is more suitable for load operation scenarios, which can further reduce the power consumption of the circuit and further improve the energy efficiency of load operation.

In the above technical means, the step of selectively controlling the power factor correction module to operate in the first mode when it is determined that the operating parameter is equal to or lower than the operating parameter threshold specifically includes: determining whether the AC signal is in a positive half-cycle waveform or a negative half-cycle waveform, if the operating parameter is determined to be less than or equal to the driving parameter threshold; When in a positive half-cycle waveform, controlling the second switching transistor to turn off, and controlling the first switching transistor to turn on during the period when the absolute value of the alternating current is greater than zero. and controlling the first switching transistor to be turned off when the alternating current signal is in the negative half-cycle waveform, and performing the second switching during a period in which the absolute value of the alternating current is greater than zero. and controlling the transistor to turn on.

In the above technical means, the step of selectively controlling the power factor correction module to operate in the first mode when it is determined that the operating parameter is equal to or greater than the operating parameter threshold specifically includes: determining whether the AC signal is in a positive half-cycle waveform or a negative half-cycle waveform, if the driving parameter is determined to be greater than or equal to the driving parameter threshold; controlling the third switching transistor to turn on and the fourth switching transistor to turn off when in a positive half-cycle waveform; and controlling the fourth switching transistor to turn on and the third switching transistor to turn off when in a periodic waveform, wherein in the first mode, a predetermined The first switching transistor and the second switching transistor are controlled to alternately turn on according to the duty cycle.

In the above technical means, selectably, when the operating parameter is determined to be less than the operating parameter threshold, the step of controlling the power factor correction module to operate in the second mode specifically includes: and controlling the power factor correction module to operate in the second mode according to a bus signal when the operating parameter is determined to be less than the operating parameter threshold, the second mode comprising an operating mode and a non-operating mode. in said operating mode, determining whether said alternating signal is in a positive half-cycle waveform or in a negative half-cycle waveform; and if said alternating signal is in said positive half-cycle waveform, said controlling a third switching transistor to turn on and controlling the fourth switching transistor to turn off; and if the alternating signal is in the negative half-cycle waveform, the fourth controlling a switching transistor to turn on and controlling the third switching transistor to turn off, wherein in the operating mode, according to the bus signal, the first switching transistor and the controlling the second switching transistors to be alternately turned on, wherein in the non-operating mode, the first switching transistor, the second switching transistor, the third switching transistor and the fourth switching transistor are Both are in the off state.

In the above technical means, selectably, when the operating parameter is determined to be less than the operating parameter threshold, the step of controlling the power factor correction module to operate in the second mode specifically includes: and controlling the power factor correction module to operate in the second mode according to a bus signal when the operating parameter is determined to be less than the operating parameter threshold, the second mode comprising an operating mode and a non-operating mode. in said operating mode, determining whether said alternating signal is in a positive half-cycle waveform or in a negative half-cycle waveform; and if said alternating signal is in said positive half-cycle waveform, said controlling a third switching transistor to turn on and controlling the fourth switching transistor to turn off; and if the alternating signal is in the negative half-cycle waveform, the fourth controlling a switching transistor to turn on and controlling the third switching transistor to turn off, wherein in the operating mode, according to the bus signal, the first switching transistor and the controlling the second switching transistors to be alternately turned on, wherein in the non-operating mode, the first switching transistor, the second switching transistor, the third switching transistor and the fourth switching transistor are Both are in the off state.

Any of the above technical means, optionally, in the operating mode, determining whether the bus signal is greater than or equal to an upper voltage threshold; and determining that the bus signal is greater than or equal to the upper voltage threshold. and if so, switching from the active mode to the non-active mode.

In the technical means, in the active mode, by determining whether the bus signal is equal to or higher than the upper voltage threshold, the active mode is switched to the non-active mode, and the bus voltage is lowered in the non-active mode. .

Any of the above technical measures, optionally, in the inactive mode, determining whether the bus signal is below the lower voltage threshold; and determining whether the bus signal is below the lower voltage threshold. and switching from the non-operating mode to the operating mode if determined to be.

In the technical means, in the non-operating mode, the non-operating mode is switched to the operating mode by determining whether the bus signal is equal to or lower than the lower voltage threshold, and in the operating mode, the bus voltage is increased. This prevents the bus voltage from dropping and making load operation impossible.

In the above technical solution, optionally, the drive control circuit further comprises a capacitive element connected between the power factor correction module and the load, the capacitive element comprising a plurality of series and/or parallel or the capacitive element includes a plurality of capacitance elements connected in series and/or in parallel, and the operation control method comprises a withstand voltage threshold of the capacitive element and the switching transistor Further comprising determining the upper voltage threshold based on a withstand voltage threshold.

In the technical means, by determining the upper limit voltage threshold based on the withstand voltage threshold of the capacitive element and the withstand voltage threshold of the switching transistor, on the one hand, the possibility of breaking down the capacitive element and the switching transistor is reduced. On the other hand, the upper voltage threshold determines when the switching transistor switches between the first mode and the second mode, further improving the reliability of the power factor correction module and the energy efficiency of the load operation.

In the above technical solution, selectably, the lower voltage threshold is greater than the peak value of the AC signal.

FIG. 3 is a schematic diagram of a drive control circuit according to one embodiment of the present application.

As shown in FIG. 3, according to the drive control circuit according to one embodiment of the present application, the drive control circuit connected between the grid system AC and the input end of the load specifically includes a bridge rectifier module, It includes a Boost-type power factor correction module, a capacitive element C (with filtering characteristics) and an inverter. A bridge rectifier module is used to convert an AC signal to a pulsating DC signal. A Boost-type power factor correction module includes an inductive element L, a switching transistor Q, and a unidirectional conduction device D. Due to the charging and discharging action of the capacitive element C, the voltage of the capacitive element C exhibits a sawtooth ripple, which in combination with the conduction characteristic of the unidirectional conducting device D, causes the instantaneous value of the AC circuit voltage to change to the voltage of the capacitive element. The unidirectional conducting device D turns on due to forward bias only when higher, i.e. the unidirectional conducting device D turns on only near the peak value in each period of the input signal of the AC circuit, The input AC voltage exhibits a sinusoidal waveform, but the input AC current has many spike pulses, ie, many harmonic components that cause a low power factor of the circuit.

Therefore, the boost-type power factor correction module can solve not only the problem of the phase difference between the AC voltage and the AC current, but also the problem of electromagnetic interference and electromagnetic compatibility due to the harmonic signal.

Furthermore, for the purpose of further improving the energy efficiency of load operation, the active boost type power factor correction module can be combined with load operation parameters to adjust the operation mode of the switching transistor Q, and When the power is detected to be low, the load is driven in the synchronous rectification mode, and when the power required to drive the load is detected to be high, the AC voltage and the bus voltage input from the grid system AC are reduced. It controls whether or not the switching transistor Q operates based on the included power supply signal.

Furthermore, when it is determined that the switching transistor Q operates in the second mode, a pulse to the switching transistor Q is further combined with the magnitude relationship between the bus voltage and the upper voltage threshold and the magnitude relationship between the bus voltage and the lower voltage threshold. It controls the output of the drive signal or the stop of the output of the pulse drive signal to the switching transistor Q. Specifically, when the bus voltage exceeds the upper voltage threshold, stop outputting the pulse driving signal to the switching transistor Q, that is, the switching transistor Q enters the non-operating mode, and when the bus voltage is lower than the lower voltage threshold, A pulse driving signal is output to the switching transistor Q, that is, the switching transistor Q is put into an operation mode, and the AC current is brought closer to a sinusoidal waveform.

In addition, the switching times between the non-operating mode and the operating mode are the zero crossing times of the AC signal, further reducing spike signals in the drive control circuit.

FIG. 4 is a schematic diagram of a drive control circuit according to another embodiment of the present application.

As shown in FIG. 4, according to the drive control circuit according to another embodiment of the present application, the drive control circuit connected between the grid system AC and the input end of the load is specifically a bridgeless totem. It includes a pole-type PFC module, a capacitive element C (with filtering characteristics) and an inverter. A bridgeless totem-pole PFC module includes an inductive element L, a switching transistor, and a unidirectional conducting device D. Due to the charging and discharging action of the capacitive element C, the voltage of the capacitive element C exhibits a sawtooth ripple, which in combination with the conduction characteristic of the unidirectional conducting device D, causes the instantaneous value of the AC circuit voltage to change to the voltage of the capacitive element. The unidirectional conducting device D turns on for forward bias only when higher, i.e., in each period of the input signal of the AC circuit, the unidirectional conducting device D turns on only near the peak value and the input The applied alternating voltage exhibits a sinusoidal waveform. However, the input alternating current has many spike pulses, ie, many harmonic components that cause a low power factor of the circuit.

Therefore, the bridgeless totem-pole PFC module can solve not only the problem of the phase difference between AC voltage and AC current, but also the problem of electromagnetic interference and electromagnetic compatibility caused by harmonic signals. In this embodiment, the switching transistors include a first switching transistor _Q1 , a second switching transistor _Q2 , a third switching transistor _Q3 and a fourth switching transistor _Q4 . The first switching transistor _Q1 and the second switching transistor _Q2 are high frequency switching transistors, and the third switching transistor _Q3 and the fourth switching transistor _Q4 are low frequency switching transistors.

Furthermore, for the purpose of further improving the energy efficiency of load operation, the active bridgeless totem-pole PFC module described above can adjust the operation mode of the switching transistor by linking it with the load operation parameter. When the power is detected to be low, the load is driven in the synchronous rectification mode, and when the power required to drive the load is detected to be high, the AC voltage and the bus voltage input from the grid system AC are reduced. It controls whether or not the switching transistor Q is operating based on the included power supply signal.

Furthermore, when it is determined that the switching transistor Q operates in the second mode, a pulse to the switching transistor Q is further combined with the magnitude relationship between the bus voltage and the upper voltage threshold and the magnitude relationship between the bus voltage and the lower voltage threshold. It controls the output of the drive signal or the stop of the output of the pulse drive signal to the switching transistor Q. Specifically, when the bus voltage exceeds the upper voltage threshold, stop outputting the pulse driving signal to the switching transistor Q, that is, the switching transistor Q enters the non-operating mode, and when the bus voltage is lower than the lower voltage threshold, A pulse driving signal is output to the switching transistor Q, that is, the switching transistor Q is put into an operation mode, and the AC current is brought closer to a sinusoidal waveform.

In addition, the switching times between the non-operating mode and the operating mode are the zero crossing times of the AC signal, further reducing spike signals in the drive control circuit.

An embodiment in which the switching transistors of the bridgeless totem-pole type PFC module operate in the first mode or the second mode will be described below in combination with the timing charts shown in FIGS.

FIG. 5 is a timing chart of an operation control method according to another embodiment of the present application.

As shown in FIG. 5, the steps in which the drive control circuit operates in the first mode include the following.

(1) In the process of inputting the alternating voltage U _S from the grid system AC to the load, in the period T ₀ to T ₃ , the alternating voltage U _S has a positive half-cycle waveform, and the third switching transistor Q ₃ is turned on; the fourth switching transistor _Q4 is turned off at the same time, and the first switching transistor _Q1 is turned on during the period _T1 - _T2 when the alternating current _IS is detected to be a positive half-cycle waveform. and the second switching transistor _Q2 is turned off.

(2) In the process of inputting the alternating voltage U _S from the grid system AC to the load, in the period _T3 - _T6 , the alternating voltage U _S has a negative half-cycle waveform, and the third switching transistor _Q3 is turned off. When the fourth switching transistor Q ₄ is turned on at the same time, and the alternating current I _S is detected to be a negative half-cycle waveform, the first switching transistor Q ₁ is turned off during the period T ₄ to T ₅ . and the second switching transistor _Q2 is turned on.

FIG. 6 is a timing chart of an operation control method according to another embodiment of the present application.

As shown in FIG. 6, the steps in which the drive control circuit operates in the first mode include the following.

(1) In the process of inputting the AC voltage U _S from the grid system AC to the load, during the period T ₀ to T ₃ , the AC voltage U _S has a positive half-cycle waveform, and the controller operates the first switching transistor Q 1 and the second switching transistor Q ₁ . 2 switching transistors _Q2 , and the duty cycle of the first switching transistor _Q1 can be a variable value (smaller to larger or larger to smaller) or a preset constant value. , the on-time of the first switching transistor _Q1 is complementary to the on-time of the second switching transistor _Q2 , the third switching transistor _Q3 turns on and the fourth switching transistor _Q4 turns off. become.

(2) During periods T ₃ to T ₆ , the AC voltage U _S has a negative half-cycle waveform, and the controller outputs pulse drive signals to the first switching transistor Q ₁ and the second switching transistor Q ₂ , and The duty cycle of the switching transistor _Q1 of 1 is a variable value (small to large or large to small) or a preset constant value, and the ON time of the first switching transistor _Q1 is the second , the _third switching transistor _Q3 turns off and the fourth switching transistor _Q4 turns on.

When it is determined by the operating parameters of the load that the switching transistor operates in the operating mode of the second mode, the load operates reliably by outputting a pulse drive signal to the switching transistor according to the timing chart shown in FIG. It helps to improve the power factor of load operation while ensuring that

An embodiment in which the switching transistor operates in the second mode in conjunction with the bus voltage as shown in FIG. 7 will now be described in detail.

(1) _{Vdc_max} is set as the upper voltage threshold, and _{Vdc_min} is set as the lower voltage threshold, and _{Vdc_min} is equal to or higher than the peak value of the input AC voltage.

(2) when detecting that the bus voltage V _dc is less than V _{dc_min} , output a pulse drive signal to the switching transistor according to the timing chart of FIG. T ₀ -T ₃ period, T ₃ -T ₆ period, T ₆ -T ₉ period, T ₉ -T ₁₂ period, T ₁₂ -T ₁₅ period, T ₁₅ -T ₁₈ period, namely 3 It becomes the input period of one AC voltage U _S .

(3) When it is detected that the bus voltage V _dc is equal to or higher than V _{dc_max} , the output of the pulse drive signal to the switching transistor is stopped, the capacitive element supplies the power necessary for load operation, and the bus voltage drops. 7, ie the periods T ₁₈ to T ₂₁ , the periods T ₂₁ to T ₂₄ , the periods T ₂₄ to T ₂₇ and the periods T ₂₇ to T ₃₀ shown in _FIG . input cycle.

Steps (2) and (3) are the process of determining cycle conditions.

An embodiment of the present application comprises a controller arranged to perform the steps of the operation control method according to any one of the above, and a controller controlled by the controller arranged to control a power supply signal to power a load. and a power factor correction module including a switching transistor.

In this embodiment, by setting the switching transistor to control the power supply signal to power the load, normal operation of the load can be ensured as long as the bus voltage is within the normal variation range. Assuming that the load is guaranteed to operate normally, a corresponding burst mode control strategy, ie, an intermittent output control strategy, can be set for changes in the bus voltage. Therefore, the intermittent output control strategy controls the high-frequency operating signal to be in the intermittent output state, that is, the high-frequency operating signal does not need to be continuously in the output state, that is, the switching transistor continuously operates at high frequency. It does not have to be in the switch state. As a result, the conduction power consumption of the power factor correction module of the drive control circuit can be reduced, and the energy efficiency of the electrical equipment (air conditioner, etc.) using the drive control circuit can be improved.

Selectably, the controller is one of a MCU (Micro-programmed Control Unit), a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and an embedded device. may be, but is not limited to.

A consumer electronic device further provided in an embodiment of the present application includes a load and a drive control circuit as described above arranged to control a power supply signal to power the load.

In the above technical means, optionally, the home appliances include at least one of air conditioners, refrigerators, fans, range hoods, vacuum cleaners and computer hosts.

An embodiment of the present application further provides a computer-readable storage medium storing a computer program, and when the computer program is executed, the steps of the operation control method according to any one of the above are realized. .

According to the technical means of the present application, by obtaining the operating parameters of the load, the operating parameters can represent the operating state of the load and the required power. Further, the power factor correction module is controlled to operate in the first mode or the second mode based on the magnitude relationship between the operating parameter and the operating parameter threshold, and the state of the switching transistor in the second mode is controlled to operate. The switching transistor does not operate in the non-operating state including the state and the non-operating state. As a result, it is possible not only to meet the power required for load operation, but also to further reduce circuit loss and power consumption, thereby helping to further improve the energy efficiency of load operation.

As will be appreciated by those skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. The present application may also be embodied in one or more computer-usable storage media (including, but not limited to, magnetic disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program code. can be used in the form of a computer program product.

This application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present application. It is to be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, thereby rendering a computer or other programmable The instructions executed by the processor of the data processing apparatus produce the apparatus to perform the functions specified in one or more of the flow charts and/or one or more blocks of the block diagrams.

These computer program instructions may be stored in a computer readable memory capable of instructing a computer or other programmable data processing apparatus to operate in a particular manner so that the computer readable The instructions stored in such memory produce an article of manufacture including instruction devices that implement the functions specified in one or more flows of the flowcharts and/or one or more blocks of the block diagrams.

These computer program instructions can also be loaded into a computer or other programmable data processing apparatus such that a series of operational steps are executed on the computer or other programmable apparatus to produce a computer-implemented sequence of steps. processes, whereby instructions executed on a computer or other programmable device are specified in one or more flows of the flowcharts and/or one or more blocks of the block diagrams. provide steps to achieve the functionality

It should be noted that, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of components or steps not listed in a claim. The word "one" or "one" preceding a component does not exclude the presence of a plurality of such components. The present application may be implemented by means of hardware including several different components and a suitably programmed computer. In the claims enumerating several devices, several of these devices may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. does not imply any order. These words may be interpreted as names.

Although preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to these embodiments once they become aware of the underlying creative concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of this application.

The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application is susceptible to various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall all fall within the protection scope of the present application.

Claims (15)

An operation control method applied to a drive control circuit,
the drive control circuit includes a power factor correction module arranged to control a power supply signal to power a load;
The operation control method includes
obtaining an operating parameter of the load and comparing the magnitude relationship between the operating parameter and an operating parameter threshold;
and controlling the power factor correction module to operate in a first mode or a second mode according to the magnitude relationship between the operating parameter and the operating parameter threshold;
The first mode is set to control the on-state of the switching transistor of the power factor correction module according to the AC signal, and the second mode is set to control the on-state of the switching transistor according to the power supply signal. to be
Operation control method. The step of acquiring the operating parameter of the load and comparing the magnitude relationship between the operating parameter and the operating parameter threshold,
sensing, at predetermined time intervals, specified operating parameters of the load including at least one of current, power, operating pressure, and frequency;
and comparing the magnitude relationship between the operating parameter and the operating parameter threshold.
The operation control method according to claim 1 . The step of controlling the switching transistor to operate in a first mode or a second mode according to the magnitude relationship between the operating parameter and the operating parameter threshold,
controlling the power factor correction module to operate in the first mode when it is determined that the operating parameter is equal to or less than the operating parameter threshold;
and controlling the power factor correction module to operate in the second mode if it is determined that the operating parameter is greater than the operating parameter threshold.
The operation control method according to claim 1 or 2 . wherein the power factor correction module comprises a bridge module, wherein the switching transistors in each arm of the bridge module are sequentially a first switching transistor, a second switching transistor, a third switching transistor and a fourth switching transistor;
the AC signal is a power supply signal on the input side of the power factor correction module;
A common terminal of the first switching transistor and the second switching transistor is connected to the first input circuit for the AC signal, and a common terminal of the third switching transistor and the fourth switching transistor is connected to the connected to a second input circuit for alternating signals;
the power supply signal is converted from the AC signal to a bus signal when rectified by the bridge module;
A common terminal of the first switching transistor and the fourth switching transistor is connected to a high voltage circuit for the bus signal, and a common terminal of the second switching transistor and the third switching transistor is connected to the bus signal. connected to a low voltage circuit,
The operation control method according to claim 3 . The step of controlling the power factor correction module to operate in the first mode when it is determined that the operating parameter is equal to or less than the operating parameter threshold,
if the operating parameter is determined to be less than or equal to the operating parameter threshold, determining whether the AC signal is in a positive half-cycle waveform or a negative half-cycle waveform;
controlling the third switching transistor to turn on and the fourth switching transistor to turn off when the alternating signal is in the positive half-cycle waveform;
controlling the fourth switching transistor to turn on and the third switching transistor to turn off when the alternating signal is in the negative half-cycle waveform;
The operation control method according to claim 4 . The step of controlling the power factor correction module to operate in the first mode when it is determined that the operating parameter is equal to or less than the operating parameter threshold,
if the operating parameter is determined to be less than or equal to the operating parameter threshold, determining whether the AC signal is in a positive half-cycle waveform or a negative half-cycle waveform;
When the alternating current signal is in the positive half-cycle waveform, controlling the second switching transistor to turn off, and turning on the first switching transistor during a period in which the absolute value of the alternating current is greater than zero. and
controlling the first switching transistor to be turned off when the alternating current signal is in the negative half-cycle waveform, and turning on the second switching transistor during a period in which the absolute value of the alternating current is greater than zero; and controlling to be
The operation control method according to claim 4 . controlling the power factor correction module to operate in the second mode when it is determined that the operating parameter is greater than the operating parameter threshold;
controlling the power factor correction module to operate in the second mode according to a bus signal if the operating parameter is determined to be greater than the operating parameter threshold, the second mode including an active mode and a non-operating mode; a step;
determining whether the AC signal is in a positive half-cycle waveform or a negative half-cycle waveform in the active mode;
controlling the third switching transistor to turn on and the fourth switching transistor to turn off when the alternating signal is in the positive half-cycle waveform;
controlling the fourth switching transistor to turn on and the third switching transistor to turn off when the alternating signal is in the negative half-cycle waveform;
in the operating mode, controlling the first switching transistor and the second switching transistor to alternately turn on according to the bus signal;
in the non-operating mode, the first switching transistor, the second switching transistor, the third switching transistor and the fourth switching transistor are all in an off state;
The operation control method according to claim 4 . determining whether the bus signal is greater than or equal to an upper voltage threshold in the active mode;
and switching from the active mode to the non-active mode when it is determined that the bus signal is greater than or equal to the upper voltage threshold.
The operation control method according to claim 7 . determining whether the bus signal is below a lower voltage threshold in the inactive mode;
switching from the non-operation mode to the operation mode when it is determined that the bus signal is below the lower voltage threshold.
The operation control method according to claim 7 . The drive control circuit further includes a capacitive element connected between the power factor correction module and the load, wherein the capacitive element includes an electrolytic capacitance, or the capacitive element includes a plurality of a capacitance element connected in series and/or in parallel with
The operation control method includes
further comprising determining the upper limit voltage threshold based on a withstand voltage threshold of the capacitive element and a withstand voltage threshold of the switching transistor;
The operation control method according to claim 8 . The lower voltage threshold is greater than the peak value of the AC signal,
The operation control method according to claim 9 . a controller arranged to execute the steps of the operation control method according to any one of claims 1 to 11 ;
a power factor correction module controlled by the controller and including a switching transistor arranged to control a power supply signal to power a load;
Drive control circuit. a load;
and a drive control circuit according to claim 12 arranged to control the power supply signal to power the load.
home appliances. the home appliances include at least one of air conditioners, refrigerators, fans, range hoods, vacuum cleaners and computer hosts;
A home appliance according to claim 13 . A computer-readable storage medium storing a computer program,
When the computer program is executed, the steps of the operation control method according to any one of claims 1 to 11 are realized,
computer readable storage medium;

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