CN114362562A - Control method of three-phase PFC circuit, terminal and storage medium - Google Patents

Abstract

The invention provides a control method, terminal and storage medium of a three-phase PFC circuit. The method includes: acquiring working parameters of a three-phase PFC circuit; if the working parameters of the three-phase PFC circuit meet a first preset condition, controlling one phase of the three-phase PFC circuit to stop working, and simultaneously controlling the remaining two phases of the three-phase PFC circuit The phases continue to work; wherein, one of the phases of the three-phase PFC circuit is any phase of the three-phase PFC circuit or one of the phases determined according to the first preset rotation sequence. When the three-phase PFC circuit is under light load, the present invention can control one of the phases to not work, and supply power to the load through two phases, which can save energy, and select a certain phase to stop working according to the first preset rotation sequence, so that each The phases do not work in turn to ensure that the life of each corresponding equipment is balanced and the availability of the three-phase PFC circuit is improved.

Description

Control method, terminal and storage medium of three-phase PFC circuit

technical field

The present invention relates to the technical field of circuit control, and in particular, to a control method, terminal and storage medium of a three-phase PFC circuit.

Background technique

A three-phase PFC (Power Factor Correction, power factor correction) circuit can also be called a three-phase AC-DC converter. When the three-phase PFC circuit works, usually all three phases are in working state. However, this working method is easy to cause energy waste under the light load state, and the three phases are in the working state for a long time, which is easy to cause equipment damage and reduce the availability of the three-phase PFC circuit.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a control method, terminal, and storage medium for a three-phase PFC circuit, so as to solve the problems that the prior art easily leads to waste of energy and easily reduces the availability of the three-phase PFC circuit.

In a first aspect, an embodiment of the present invention provides a control method for a three-phase PFC circuit, including:

Obtain the working parameters of the three-phase PFC circuit;

If the working parameters of the three-phase PFC circuit meet the first preset condition, control one phase of the three-phase PFC circuit to stop working, and control the remaining two phases of the three-phase PFC circuit to continue to work at the same time;

Wherein, one of the phases of the three-phase PFC circuit is any phase of the three-phase PFC circuit or one of the phases determined according to the first preset rotation sequence.

In a possible implementation manner, controlling one phase of the three-phase PFC circuit to stop working, while controlling the remaining two phases of the three-phase PFC circuit to continue to work, includes:

If the three-phase PFC circuit is a three-phase four-wire PFC circuit, stop sending the drive signal to one of the corresponding switch tubes of the three-phase PFC circuit, and continue to send the drive signal to the remaining two corresponding switch tubes of the three-phase PFC circuit. ;

If the three-phase PFC circuit is a three-phase three-wire PFC circuit, stop sending driving signals to one of the corresponding switch tubes of the three-phase PFC circuit, and at the same time adjust the driving signals of the remaining two corresponding switch tubes of the three-phase PFC circuit. The duty cycle is used to adjust the current phase of the remaining two phases of the three-phase PFC circuit, so that the remaining two phases of the three-phase PFC circuit work in the single-phase PFC mode.

In a possible implementation manner, the working parameters of the three-phase PFC circuit include the input current of the three-phase PFC circuit;

The first preset condition is that the input current of the three-phase PFC circuit is less than the first preset current threshold.

In a possible implementation manner, the first preset condition is that the input current of the three-phase PFC circuit is less than the first preset current threshold, and the duration for which the input current of the three-phase PFC circuit is less than the first preset current threshold is greater than the first preset current threshold a preset duration.

In a possible implementation manner, after obtaining the operating parameters of the three-phase PFC circuit, the control method of the three-phase PFC circuit further includes:

If the operating parameters of the three-phase PFC circuit satisfy the second preset condition and the three-phase PFC circuit is a three-phase four-wire PFC circuit, control two phases of the three-phase PFC circuit to stop working, and control the remaining one phase of the three-phase PFC circuit at the same time continue working;

Wherein, two of the three phases of the three-phase PFC circuit are any two phases of the three-phase PFC circuit or two of the phases determined according to the second preset rotation sequence.

In a possible implementation manner, controlling two phases of the three-phase PFC circuit to stop working, while controlling the remaining one phase of the three-phase PFC circuit to continue to work, includes:

Stop sending drive signals to two corresponding switch tubes of the three-phase PFC circuit, and continue to send drive signals to the remaining one corresponding switch tube of the three-phase PFC circuit.

In a possible implementation manner, the working parameters of the three-phase PFC circuit include the input current of the three-phase PFC circuit;

The second preset condition is that the input current of the three-phase PFC circuit is less than the second preset current threshold.

In a possible implementation manner, the second preset condition is that the input current of the three-phase PFC circuit is less than the second preset current threshold, and the duration for which the input current of the three-phase PFC circuit is less than the second preset current threshold is greater than the first 2. Preset duration.

In a second aspect, an embodiment of the present invention provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, which is implemented when the processor executes the computer program The steps of the control method for a three-phase PFC circuit according to the first aspect or any possible implementation manner of the first aspect.

In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, implements the first aspect or any of the first aspect above. The steps of the control method for a three-phase PFC circuit described in a possible implementation manner.

Embodiments of the present invention provide a control method, a terminal, and a storage medium for a three-phase PFC circuit. By acquiring the working parameters of the three-phase PFC circuit, when it is detected that the working parameters of the three-phase PFC circuit meet the first preset condition, control the three-phase PFC circuit. One phase of the three-phase PFC circuit stops working, and at the same time, the remaining two phases of the three-phase PFC circuit are controlled to continue to work, so that when the three-phase PFC circuit is lightly loaded, one of the phases can be controlled to not work. In addition, one of the phases of the above-mentioned three-phase PFC circuit is any phase of the three-phase PFC circuit or according to the first preset rotation sequence For one of the determined phases, select a certain phase to stop working according to the first preset rotation sequence, which can make each phase not work in turn, ensure the lifespan of each corresponding equipment is balanced, and improve the availability of the three-phase PFC circuit.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the realization flow chart of the control method of the three-phase PFC circuit provided by the embodiment of the present invention;

2 is a schematic structural diagram of a three-phase four-wire PFC circuit provided by an embodiment of the present invention;

3 is a schematic structural diagram of a three-phase three-wire PFC circuit provided by an embodiment of the present invention;

4 is a schematic diagram of the current phase of the three-phase three-wire PFC circuit provided by an embodiment of the present invention before and after the V phase is turned off;

5 is a schematic diagram of the current phase before and after the three-phase four-wire PFC circuit provided by the embodiment of the present invention before and after the V-phase and the W-phase are turned off;

6 is a schematic structural diagram of a control device for a three-phase PFC circuit provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of a terminal provided by an embodiment of the present invention.

Detailed ways

In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are set forth in order to provide a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In order to make the objectives, technical solutions and advantages of the present invention clearer, the following descriptions will be given through specific embodiments in conjunction with the accompanying drawings.

Referring to FIG. 1 , it shows an implementation flow chart of a method for controlling a three-phase PFC circuit provided by an embodiment of the present invention, wherein the executing subject of the method for controlling a three-phase PFC circuit may be a terminal, and the terminal may be a controller.

Referring to Figure 1, the control method of the three-phase PFC circuit is described in detail as follows:

In S101, the operating parameters of the three-phase PFC circuit are acquired.

In this embodiment, the working parameters of the three-phase PFC circuit can be acquired in real time, and whether the three-phase PFC circuit is in a light-load state can be judged by detecting the working parameters of the three-phase PFC circuit, thereby judging whether one-phase or two-phase operation can be stopped.

The operating parameters of the three-phase PFC circuit may include at least one of input current, input voltage, output current and output voltage of the three-phase PFC circuit.

In S102, if the operating parameters of the three-phase PFC circuit satisfy the first preset condition, control one phase of the three-phase PFC circuit to stop working, and simultaneously control the remaining two phases of the three-phase PFC circuit to continue to work;

Wherein, one of the phases of the three-phase PFC circuit is any phase of the three-phase PFC circuit or one of the phases determined according to the first preset rotation sequence.

In this embodiment, if it is detected that the operating parameters of the three-phase PFC circuit meet the first preset condition, it can be determined that the three-phase PFC circuit is in a light-load state, and at this time, one phase of the three-phase PFC circuit can be controlled to not work , the other two phases continue to work and supply power to the load through the remaining two phases. Exemplarily, the U-phase can be controlled to not work, and the V-phase and the W-phase can be controlled to continue to work.

In a possible implementation manner, if the operating parameters of the three-phase PFC circuit satisfy the first preset condition, any phase of the three-phase PFC circuit is selected, the phase is controlled to not work, and the remaining two phases are controlled to continue to work.

In a possible implementation manner, if the operating parameters of the three-phase PFC circuit satisfy the first preset condition, one of the phases is selected in turn according to the first preset order, the phase is controlled to not work, and the remaining two phases are controlled to continue to work. .

The first preset rotation sequence may be set according to actual requirements, for example, may be the sequence of U, V, W, or may be the sequence of U, W, V, etc., which is not specifically limited here.

Through the first preset rotation sequence, different phases can be controlled to not work each time, so that the corresponding equipments can be rested in turn and their lifespan can be improved. Exemplarily, assuming that the first preset rotation sequence is the sequence of U, V, and W, the U phase is selected to stop working this time, the V phase is selected to stop working in this order next time, and so on.

It can be seen from the above description that in this embodiment, by acquiring the working parameters of the three-phase PFC circuit, when it is detected that the working parameters of the three-phase PFC circuit meet the first preset condition, one phase of the three-phase PFC circuit is controlled to stop working, and at the same time the control is performed. The remaining two phases of the three-phase PFC circuit continue to work, so that one phase of the three-phase PFC circuit can be controlled to not work when the three-phase PFC circuit is lightly loaded, and the load can be powered by two phases, which can save energy. , the life of the corresponding equipment can be improved; in addition, one of the phases of the above-mentioned three-phase PFC circuit is any phase of the three-phase PFC circuit or one of the phases determined according to the first preset rotation sequence, according to the first preset rotation Selecting a certain phase to stop working in sequence can make each phase not work in turn, ensure the lifespan of each corresponding equipment is balanced, and improve the availability of the three-phase PFC circuit.

In some embodiments, "controlling one phase of the three-phase PFC circuit to stop working, while controlling the remaining two phases of the three-phase PFC circuit to continue working" in the above S102 may include:

If the three-phase PFC circuit is a three-phase four-wire PFC circuit, stop sending the drive signal to one of the corresponding switch tubes of the three-phase PFC circuit, and continue to send the drive signal to the remaining two corresponding switch tubes of the three-phase PFC circuit. ;

If the three-phase PFC circuit is a three-phase three-wire PFC circuit, stop sending driving signals to one of the corresponding switch tubes of the three-phase PFC circuit, and at the same time adjust the driving signals of the remaining two corresponding switch tubes of the three-phase PFC circuit. The duty cycle is used to adjust the current phase of the remaining two phases of the three-phase PFC circuit, so that the remaining two phases of the three-phase PFC circuit work in the single-phase PFC mode.

The three-phase four-wire PFC circuit is a three-phase PFC circuit with a neutral line (N line), and its structure is shown in Figure 2. The three-phase four-wire PFC circuit includes ports U, V, W and N for connecting with the input power supply, inductors L1, L2 and L3, capacitors C1, C2, C3, C4 and C5, and switch tubes S1, S2, S3, S4, S5 and S6. Two ends of the capacitor C4 are respectively connected to BUS+ and NBUS, and two ends of the capacitor C5 are respectively connected to NBUS and BUS-. The specific connection relationship of the circuit can be seen in FIG. 2 and will not be repeated.

Since each phase of the three-phase four-wire PFC circuit can form a loop with the zero line, the three phases do not affect each other, and any one or two phases can be controlled to stop working, and the remaining two phases or the remaining one phase can be controlled to continue to work. , and it can work normally without adjusting the phase.

The three-phase PFC circuit needs to continuously send driving signals to each corresponding switch tube to make each phase work. Therefore, when the three-phase PFC circuit is a three-phase four-wire PFC circuit, it is only necessary to stop sending the drive signal to one of the corresponding switch tubes of the three-phase PFC circuit, so that the phase can no longer work, and the remaining two phases can continue to be sent. The corresponding switch tube sends a drive signal, so that the remaining two phases can continue to work. Among them, in the three-phase four-wire PFC circuit, the drive signal sent to the remaining two corresponding switch tubes and the drive signal sent to the switch tubes when the three phases work together can remain unchanged without adjustment.

Referring to FIG. 2, the switches corresponding to U are S1 and S2, the switches corresponding to V are S3 and S4, and the switches corresponding to W are S5 and S6. When the control V-phase does not work, stop sending driving signals to S3 and S4, and continue to send driving signals to S1, S2, S5 and S6.

It should be noted that the above-mentioned continuing to send the drive signal to the switch tubes corresponding to the remaining two of the three-phase PFC circuit does not mean that the same drive signal is sent to the switch tubes corresponding to the remaining two of the three-phase PFC circuit. A way of saying the opposite of the drive signal.

The three-phase three-wire PFC circuit is a PFC circuit without zero line, and its structure is shown in Figure 3. The three-phase three-wire PFC circuit includes ports U, V and W for connecting to the input power supply, inductors L1, L2 and L3, capacitors C1, C2, C3 and C4, and switches S1, S2, S3, S4, S5 and S6 . Two ends of the capacitor C4 are respectively connected to BUS+ and BUS-. The specific connection relationship of the circuit can be seen in FIG. 3 and will not be repeated.

Since a three-phase three-wire PFC has no neutral, at least two phases are required to form a loop. That is to say, the three-phase three-wire PFC can only control one phase to stop working at most, and cannot control two phases to stop working. When two phases of the control three-phase three-wire PFC circuit stop working, the circuit can no longer continue to work normally.

In a three-phase three-wire PFC circuit, to control one of the phases to stop working and control the remaining two phases to continue to work, it is not only necessary to turn off the drive of one of the phases that needs to stop working, but also to adjust the driving signal of the remaining two corresponding switch tubes. The empty ratio is adjusted to adjust the current phase of the remaining two phases, so that the remaining two phases of the three-phase PFC circuit work in the single-phase PFC mode. The single-phase PFC mode refers to the working mode of the single-phase PFC. In the working mode of the single-phase PFC, the driving signal sent to each switch tube that needs to work is sent to the switch that needs to work in the working mode of the three-phase PFC. The driving signals of the transistors are different, therefore, the duty ratios of the driving signals of the remaining two pairs of corresponding switching transistors need to be adjusted.

Referring to Figure 3, it is assumed that the V-phase stops working, and the U-phase and V-phase continue to work. At this time, the three-phase three-wire PFC circuit is equivalent to a single-phase PFC composed of UW, and needs to work in the single-phase PFC mode. For example, the U phase can be regarded as the L line, and the W phase can be regarded as the N line, which is equivalent to an L-N single-phase PFC.

Referring to Figure 4, the left side of Figure 4 is the current phase of the three phases when the three phases of the three-phase three-wire PFC circuit are working, and the right side of Figure 4 is the current phase of the single-phase PFC composed of U and W phases when the V phase is turned off, Compared with the current phase of the original U-phase, the current phase has changed by 30 degrees. The change can be realized by adjusting the duty ratio of the driving signal of the corresponding switch tube, and can be adjusted by using the existing method, which will not be repeated here.

In some embodiments, the operating parameters of the three-phase PFC circuit include an input current of the three-phase PFC circuit;

The first preset condition is that the input current of the three-phase PFC circuit is less than the first preset current threshold.

In this embodiment, the input current is used to determine whether the three-phase PFC circuit is in a light-load state. When the input current is less than the first preset current threshold, it is determined that the three-phase PFC circuit is in a light-load state, and one phase of the three-phase PFC circuit is controlled to stop working. , and control the remaining two phases of the three-phase PFC circuit to continue to work.

Wherein, the first preset current threshold can be set according to actual requirements, and no specific limitation is imposed.

In some embodiments, the first preset condition is that the input current of the three-phase PFC circuit is less than a first preset current threshold, and the duration for which the input current of the three-phase PFC circuit is less than the first preset current threshold is greater than the first preset duration.

In this embodiment, in order to prevent misjudgment or to prevent one phase from being repeatedly switched between the working state and the non-working state, an additional condition is added on the basis of judging that the input current is less than the first preset current threshold, and the input current is judged at the same time. Whether the duration for which the current is less than the first preset current threshold is greater than the first preset duration, and if both are satisfied, it is determined that the three-phase PFC circuit is in a light-load state, and one phase of the three-phase PFC circuit is controlled to stop working, and at the same time control The remaining two phases of the three-phase PFC circuit continue to operate.

The first preset duration may be set according to actual requirements, for example, may be 5 seconds, 10 seconds, or the like.

In some embodiments, after obtaining the operating parameters of the three-phase PFC circuit, the control method for the three-phase PFC circuit further includes:

If the operating parameters of the three-phase PFC circuit satisfy the second preset condition and the three-phase PFC circuit is a three-phase four-wire PFC circuit, control two phases of the three-phase PFC circuit to stop working, and control the remaining one phase of the three-phase PFC circuit at the same time continue working;

Wherein, two of the three phases of the three-phase PFC circuit are any two phases of the three-phase PFC circuit or two of the phases determined according to the second preset rotation sequence.

The three-phase PFC circuit is in different degrees of light load states when the operating parameters of the three-phase PFC circuit satisfy the second preset condition and when the operating parameters of the three-phase PFC circuit satisfy the first preset condition. The load factor of the three-phase PFC circuit when the working parameters of the three-phase PFC circuit meet the second preset condition is smaller than the load factor of the three-phase PFC circuit when the working parameters of the three-phase PFC circuit meet the first preset condition.

For example, when the working parameters of the three-phase PFC circuit meet the first preset condition, the load rate of the three-phase PFC circuit is 50%; when the working parameters of the three-phase PFC circuit meet the second preset condition, the load rate of the three-phase PFC circuit 30%.

Since only one phase of the three-phase four-wire PFC circuit can work, when the circuit meets the second preset condition, two phases of the circuit can be controlled to stop working, while the remaining one phase can be controlled to continue working.

Wherein, the second preset rotation sequence and the first preset rotation sequence may be the same or different, which is not specifically limited herein.

In some embodiments, controlling two phases of the three-phase PFC circuit to stop working, while controlling the remaining one phase of the three-phase PFC circuit to continue to work, includes:

Stop sending drive signals to two corresponding switch tubes of the three-phase PFC circuit, and continue to send drive signals to the remaining one corresponding switch tube of the three-phase PFC circuit.

According to the foregoing description, any two phases of the three-phase four-wire PFC circuit do not affect each other. Therefore, two phases are controlled to stop working, and the driving of the two corresponding switching tubes can be directly turned off, and the driving of the remaining one-phase switching tubes continues to be maintained.

Referring to Figure 5, the left side of Figure 5 is the current phase of the three phases when the three phases of the three-phase four-wire PFC circuit are working, and the realization arrow on the right side of Figure 5 is the three-phase four-wire PFC circuit after the two phases V and W are turned off. The current phase of the U-phase, because there is a neutral line, so the two phases V and W are closed, which does not affect the U-phase current phase, and the current flows from U to N.

In some embodiments, the operating parameters of the three-phase PFC circuit include an input current of the three-phase PFC circuit;

The second preset condition is that the input current of the three-phase PFC circuit is less than the second preset current threshold. At this time, the first preset condition is that the input current of the three-phase PFC circuit is less than the first preset current threshold and not less than the second preset current threshold.

Wherein, the second preset current threshold is smaller than the first preset current threshold. The second preset current threshold can be set according to actual requirements, and is not limited herein.

In some embodiments, the second preset condition is that the input current of the three-phase PFC circuit is less than the second preset current threshold, and the duration for which the input current of the three-phase PFC circuit is less than the second preset current threshold is greater than the second preset duration. At this time, the first preset condition is that the input current of the three-phase PFC circuit is less than the first preset current threshold and not less than the second preset current threshold, and the input current of the three-phase PFC circuit is less than the first preset current threshold and The duration of not less than the second preset current threshold is greater than the first preset duration.

The first preset duration and the second preset duration may or may not be equal, and there is no specific limitation. The second preset duration can be set according to actual needs, for example, it can be 5 seconds, 10 seconds, and so on.

In a possible implementation manner, after two phases of the above-mentioned controlled three-phase PFC circuit stop working, and at the same time, the remaining one phase of the three-phase PFC circuit is controlled to continue to work, the control method for the above-mentioned three-phase PFC circuit further includes:

If the three-phase PFC circuit is a three-phase four-wire PFC circuit, and the working parameters of the three-phase PFC circuit do not meet the second preset condition, and the working parameters of the three-phase PFC circuit meet the first preset condition, the control system that has stopped working is controlled. Any one of the two phases resumes work, or controls the two phases that have stopped working (two of the above three-phase PFC circuits) to resume work, and controls the one phase that is working (the remaining one of the above three-phase PFC circuit). phase) stop working;

If the three-phase PFC circuit is a three-phase four-wire PFC circuit, and the operating parameters of the three-phase PFC circuit do not meet the second preset conditions, and the operating parameters of the three-phase PFC circuit do not meet the first preset conditions, the control has stopped working Both the two phases of the control system are restored to work, that is, the three phases are controlled to work.

In a possible implementation manner, after "controlling one phase of the three-phase PFC circuit to stop working, while controlling the remaining two phases of the three-phase PFC circuit to continue to work" in the above S102, the control method for the three-phase PFC circuit further include:

If the working parameters of the three-phase PFC circuit do not meet the first preset condition, and the working parameters of the three-phase PFC circuit do not meet the second preset condition, control the one phase of the three-phase PFC circuit that has stopped working to resume operation, that is, control the All three phases work.

It should be understood that the size of the sequence numbers of the steps in the above embodiments does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

The following are apparatus embodiments of the present invention, and for details that are not described in detail, reference may be made to the above-mentioned corresponding method embodiments.

FIG. 6 shows a schematic structural diagram of a control device for a three-phase PFC circuit provided by an embodiment of the present invention. For convenience of description, only the part related to the embodiment of the present invention is shown, and the details are as follows:

As shown in FIG. 6 , the control device 100 of the three-phase PFC circuit includes: an acquisition module 101 and a first control module 102 .

an acquisition module 101 for acquiring the working parameters of the three-phase PFC circuit;

The first control module 102 is configured to control one phase of the three-phase PFC circuit to stop working if the working parameters of the three-phase PFC circuit satisfy the first preset condition, and simultaneously control the remaining two phases of the three-phase PFC circuit to continue to work;

Wherein, one of the phases of the three-phase PFC circuit is any phase of the three-phase PFC circuit or one of the phases determined according to the first preset rotation sequence.

In a possible implementation manner, the first control module 102 is specifically configured to:

If the three-phase PFC circuit is a three-phase four-wire PFC circuit, stop sending the drive signal to one of the corresponding switch tubes of the three-phase PFC circuit, and continue to send the drive signal to the remaining two corresponding switch tubes of the three-phase PFC circuit. ;

If the three-phase PFC circuit is a three-phase three-wire PFC circuit, stop sending driving signals to one of the corresponding switch tubes of the three-phase PFC circuit, and at the same time adjust the driving signals of the remaining two corresponding switch tubes of the three-phase PFC circuit. The duty cycle is used to adjust the current phase of the remaining two phases of the three-phase PFC circuit, so that the remaining two phases of the three-phase PFC circuit work in the single-phase PFC mode.

In a possible implementation manner, the working parameters of the three-phase PFC circuit include the input current of the three-phase PFC circuit;

The first preset condition is that the input current of the three-phase PFC circuit is less than the first preset current threshold.

In a possible implementation manner, the first preset condition is that the input current of the three-phase PFC circuit is less than the first preset current threshold, and the duration for which the input current of the three-phase PFC circuit is less than the first preset current threshold is greater than the first preset current threshold a preset duration.

In a possible implementation manner, the control device 100 of the three-phase PFC circuit further includes: a second control module.

The second control module is configured to control two phases of the three-phase PFC circuit to stop working, and control three The remaining one phase of the phase PFC circuit continues to work;

Wherein, two of the three phases of the three-phase PFC circuit are any two phases of the three-phase PFC circuit or two of the phases determined according to the second preset rotation sequence.

In a possible implementation manner, the second control module is specifically used for:

Stop sending drive signals to two corresponding switch tubes of the three-phase PFC circuit, and continue to send drive signals to the remaining one corresponding switch tube of the three-phase PFC circuit.

In a possible implementation manner, the working parameters of the three-phase PFC circuit include the input current of the three-phase PFC circuit;

The second preset condition is that the input current of the three-phase PFC circuit is less than the second preset current threshold.

In a possible implementation manner, the second preset condition is that the input current of the three-phase PFC circuit is less than the second preset current threshold, and the duration for which the input current of the three-phase PFC circuit is less than the second preset current threshold is greater than the first 2. Preset duration.

FIG. 7 is a schematic diagram of a terminal provided by an embodiment of the present invention. As shown in FIG. 7 , the terminal 11 of this embodiment includes: a processor 110 , a memory 111 , and a computer program 112 stored in the memory 111 and executable on the processor 110 . When the processor 110 executes the computer program 112 , the steps in the above-mentioned embodiments of the control methods for the three-phase PFC circuits are implemented, for example, S101 to S102 shown in FIG. 1 . Alternatively, when the processor 110 executes the computer program 112, the functions of the modules/units in the foregoing apparatus embodiments, for example, the functions of the modules/units 101 to 102 shown in FIG. 6 are implemented.

Exemplarily, the computer program 112 may be divided into one or more modules/units, and the one or more modules/units are stored in the memory 111 and executed by the processor 110 to complete the this invention. The one or more modules/units may be a series of computer program instruction segments capable of accomplishing specific functions, and the instruction segments are used to describe the execution process of the computer program 112 in the terminal 11 . For example, the computer program 112 may be divided into modules/units 101 to 102 shown in FIG. 6 .

The terminal 11 may be a computing device such as a desktop computer, a notebook, a palmtop computer and a cloud server. The terminal 11 may include, but is not limited to, a processor 110 and a memory 111 . Those skilled in the art can understand that FIG. 7 is only an example of the terminal 11, and does not constitute a limitation on the terminal 11, and may include more or less components than the one shown, or combine some components, or different components, such as The terminal may also include an input and output device, a network access device, a bus, and the like.

The so-called processor 110 may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 111 may be an internal storage unit of the terminal 11 , such as a hard disk or a memory of the terminal 11 . The memory 111 may also be an external storage device of the terminal 11, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card equipped on the terminal 11, Flash card (FlashCard) and so on. Further, the memory 111 may also include both an internal storage unit of the terminal 11 and an external storage device. The memory 111 is used to store the computer program and other programs and data required by the terminal. The memory 111 may also be used to temporarily store data that has been output or will be output.

Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned functions can be allocated to different functional units, Module completion, that is, dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit, and the above-mentioned integrated units may adopt hardware. It can also be realized in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing from each other, and are not used to limit the protection scope of the present application. For the specific working process of the units and modules in the above-mentioned system, reference may be made to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In the foregoing embodiments, the description of each embodiment has its own emphasis. For parts that are not described or described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other manners. For example, the device/terminal embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or Components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated modules/units, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the present invention can implement all or part of the processes in the methods of the above embodiments, and can also be completed by instructing relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. When the program is executed by the processor, the steps of the above-mentioned embodiments of the control methods for the three-phase PFC circuits can be implemented. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form, and the like. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, removable hard disk, magnetic disk, optical disk, computer memory, Read-Only Memory (ROM) , Random Access Memory (Random Access Memory, RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable media may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer-readable media Excluded are electrical carrier signals and telecommunication signals.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still possible to implement the foregoing implementations. The technical solutions described in the examples are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the within the protection scope of the present invention.

Claims (10)

1. a control method of a three-phase PFC circuit, is characterized in that, comprises: obtaining the operating parameters of the three-phase PFC circuit; If the operating parameters of the three-phase PFC circuit meet the first preset condition, control one phase of the three-phase PFC circuit to stop working, and control the remaining two phases of the three-phase PFC circuit to continue to work at the same time; Wherein, one of the phases of the three-phase PFC circuit is any one of the phases of the three-phase PFC circuit or one of the phases determined according to the first preset rotation sequence. 2 . The method for controlling a three-phase PFC circuit according to claim 1 , wherein the control of one phase of the three-phase PFC circuit stops working, while the remaining two phases of the three-phase PFC circuit are controlled to continue to work. 3 . work, including: If the three-phase PFC circuit is a three-phase four-wire PFC circuit, stop sending the drive signal to one of the corresponding switch tubes of the three-phase PFC circuit, and continue to send the driving signal to the remaining two pairs of the three-phase PFC circuit at the same time. The switch tube sends the drive signal; If the three-phase PFC circuit is a three-phase three-wire PFC circuit, stop sending driving signals to one of the corresponding switch tubes of the three-phase PFC circuit, and at the same time adjust the remaining two corresponding switches of the three-phase PFC circuit. The duty ratio of the driving signal of the switch tube is used to adjust the current phases of the remaining two phases of the three-phase PFC circuit, so that the remaining two phases of the three-phase PFC circuit work in the single-phase PFC mode. 3. The control method of the three-phase PFC circuit according to claim 1, wherein the operating parameters of the three-phase PFC circuit comprise the input current of the three-phase PFC circuit; The first preset condition is that the input current of the three-phase PFC circuit is less than a first preset current threshold. 4 . The method for controlling a three-phase PFC circuit according to claim 3 , wherein the first preset condition is that the input current of the three-phase PFC circuit is less than a first preset current threshold, and the three-phase PFC circuit The duration for which the input current of the phase PFC circuit is less than the first preset current threshold is greater than the first preset duration. 5. The control method of the three-phase PFC circuit according to any one of claims 1 to 4, wherein after the acquisition of the operating parameters of the three-phase PFC circuit, the control method of the three-phase PFC circuit Also includes: If the operating parameters of the three-phase PFC circuit satisfy the second preset condition and the three-phase PFC circuit is a three-phase four-wire PFC circuit, control two phases of the three-phase PFC circuit to stop working, and control the three-phase PFC circuit at the same time. The remaining one phase of the three-phase PFC circuit continues to work; Wherein, two of the three phases of the three-phase PFC circuit are any two phases of the three-phase PFC circuit or two of the phases determined according to the second preset rotation sequence. 6 . The method for controlling a three-phase PFC circuit according to claim 5 , wherein two phases of the three-phase PFC circuit are controlled to stop working, while the remaining one phase of the three-phase PFC circuit is controlled to continue. 7 . work, including: Stop sending drive signals to two corresponding switch tubes of the three-phase PFC circuit, and continue to send drive signals to the remaining one corresponding switch tubes of the three-phase PFC circuit. 7. The control method of a three-phase PFC circuit according to claim 5, wherein the operating parameters of the three-phase PFC circuit comprise the input current of the three-phase PFC circuit; The second preset condition is that the input current of the three-phase PFC circuit is less than a second preset current threshold. 8 . The method for controlling a three-phase PFC circuit according to claim 7 , wherein the second preset condition is that the input current of the three-phase PFC circuit is less than a second preset current threshold, and the three-phase PFC circuit The duration for which the input current of the phase PFC circuit is less than the second preset current threshold is greater than the second preset duration. 9. A terminal comprising a memory, a processor and a computer program stored in the memory and running on the processor, wherein the processor implements the above claims when executing the computer program Steps of the control method of the three-phase PFC circuit described in any one of 1 to 8. 10. A computer-readable storage medium storing a computer program, characterized in that, when the computer program is executed by a processor, the three described above are implemented in any one of claims 1 to 8. Steps of a control method of a phase PFC circuit.

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