Control Method, Terminal and Storage Medium of Three-Phase PFC Circuit

Abstract

The present invention provides a control method, a terminal and a storage medium for a three-phase PFC circuit. The method includes: obtaining the operating parameters of the three-phase PFC circuit; if the operating 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 at the same time controlling the remaining two phases of the three-phase PFC circuit to continue working; wherein, one phase of the three-phase PFC circuit is any one phase of the three-phase PFC circuit or one phase determined according to a first preset rotation order. The present invention can control one phase not to work when the three-phase PFC circuit is lightly loaded, supply power to the load through two phases, can save energy, and can select a certain phase that stops working according to the first preset rotation order, so that each phase can take turns not to work, ensure the balanced life of the corresponding devices of each phase, and improve the usability of the three-phase PFC circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit control, and in particular, to a control method, a terminal, and a storage medium for a three-phase PFC circuit. Background Art

[0002] A three-phase PFC (Power Factor Correction) circuit can also be referred to as a three-phase AC-DC converter. When the three-phase PFC circuit is operating, usually all three phases are in the operating state. However, this operating mode is prone to energy waste under light load conditions, and all three phases being in the operating state for a long time is likely to cause equipment damage and reduce the availability of the three-phase PFC circuit. Summary of the Invention

[0003] Embodiments of the present invention provide a control method, a terminal, and a storage medium for a three-phase PFC circuit to solve the problems in the prior art that are prone to energy waste and likely to reduce the availability of the three-phase PFC circuit.

[0004] In a first aspect, embodiments of the present invention provide a control method for a three-phase PFC circuit, including:

[0005] Obtaining the operating parameters of the three-phase PFC circuit;

[0006] If the operating parameters of the three-phase PFC circuit meet a first preset condition, then controlling one phase of the three-phase PFC circuit to stop operating, and at the same time controlling the remaining two phases of the three-phase PFC circuit to continue operating;

[0007] Wherein, one phase of the three-phase PFC circuit is any one phase of the three-phase PFC circuit or one phase determined according to a first preset rotation order.

[0008] In a possible implementation manner, controlling one phase of the three-phase PFC circuit to stop operating and at the same time controlling the remaining two phases of the three-phase PFC circuit to continue operating includes:

[0009] If the three-phase PFC circuit is a three-phase four-wire PFC circuit, then stopping sending a driving signal to the switching tube corresponding to one phase of the three-phase PFC circuit, and at the same time continuing to send driving signals to the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit;

[0010] If the three-phase PFC circuit is a three-phase three-wire PFC circuit, then stopping sending a driving signal to the switching tube corresponding to one phase of the three-phase PFC circuit, and at the same time adjusting the duty cycle of the driving signals of the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit 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 operate in a single-phase PFC mode.

[0011] In a possible implementation, the operating parameters of the three-phase PFC circuit include the input current of the three-phase PFC circuit;

[0012] The first preset condition is that the input current of the three-phase PFC circuit is less than the first preset current threshold.

[0013] In a possible implementation, 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 duration.

[0014] In a possible implementation, after obtaining the operating parameters of the three-phase PFC circuit, the control method of the three-phase PFC circuit further includes:

[0015] If the operating parameters of the three-phase PFC circuit meet the second preset condition and the three-phase PFC circuit is a three-phase four-wire PFC circuit, then control two of the phases of the three-phase PFC circuit to stop working, and at the same time control the remaining one phase of the three-phase PFC circuit to continue working;

[0016] Wherein, two of the phases of the three-phase PFC circuit are any two phases of the three-phase PFC circuit or two phases determined according to the second preset rotation sequence.

[0017] In a possible implementation, controlling two of the phases of the three-phase PFC circuit to stop working and at the same time controlling the remaining one phase of the three-phase PFC circuit to continue working includes:

[0018] Stop sending drive signals to the switching tubes corresponding to two of the phases of the three-phase PFC circuit, and at the same time continue to send drive signals to the switching tubes corresponding to the remaining one phase of the three-phase PFC circuit.

[0019] In a possible implementation, the operating parameters of the three-phase PFC circuit include the input current of the three-phase PFC circuit;

[0020] The second preset condition is that the input current of the three-phase PFC circuit is less than the second preset current threshold.

[0021] In a possible implementation, 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.

[0022] 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. When the processor executes the computer program, it implements the steps of the control method of the three-phase PFC circuit as described in the first aspect or any possible implementation manner of the first aspect above.

[0023] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium storing a computer program, which when executed by a processor, implements the steps of the control method for the three-phase PFC circuit as described in the first aspect above or any possible implementation manner of the first aspect.

[0024] An embodiment of the present invention provides a control method, a terminal, and a storage medium for a three-phase PFC circuit. By obtaining the operating parameters of the three-phase PFC circuit, when it is detected that the operating 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 remaining two phases of the three-phase PFC circuit are controlled to continue working. Thus, when the three-phase PFC circuit is lightly loaded, one phase can be controlled not to work, and the load can be powered by two phases, which can save energy. Moreover, by making a certain phase not work, the lifespan of the corresponding device of this phase can be increased. In addition, any one of the three phases of the above three-phase PFC circuit or one phase determined according to the first preset rotation order is used. Selecting a certain phase that stops working according to the first preset rotation order can make each phase take turns not to work, ensure the balanced lifespan of the corresponding devices of each phase, and improve the usability of the three-phase PFC circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 is a flowchart of the implementation of the control method for the three-phase PFC circuit provided by an embodiment of the present invention;

[0027] Figure 2 is a schematic structural diagram of a three-phase four-wire PFC circuit provided by an embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of a three-phase three-wire PFC circuit provided by an embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of the current phase before and after closing the V phase of the three-phase three-wire PFC circuit provided by an embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of the current phase before and after closing the V phase and the W phase of the three-phase four-wire PFC circuit provided by an embodiment of the present invention;

[0031] Figure 6It is a schematic structural diagram of a control device for a three-phase PFC circuit provided by an embodiment of the present invention;

[0032] Figure 7 It is a schematic diagram of a terminal provided by an embodiment of the present invention. Detailed implementation manners

[0033] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0034] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will be described through specific embodiments with reference to the accompanying drawings.

[0035] Refer to Figure 1 , which shows a flowchart for implementing a control method for a three-phase PFC circuit provided by an embodiment of the present invention. Among them, the execution subject of the control method for the three-phase PFC circuit can be a terminal, and this terminal can be a controller.

[0036] Refer to Figure 1 , and the control method for the three-phase PFC circuit is described in detail as follows:

[0037] In S101, working parameters of the three-phase PFC circuit are obtained.

[0038] In this embodiment, the working parameters of the three-phase PFC circuit can be obtained 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, so as to judge whether one or two phases can stop working.

[0039] Among them, the working parameters of the three-phase PFC circuit can include at least one of the input current, input voltage, output current, and output voltage of the three-phase PFC circuit.

[0040] In S102, if the working parameters of the three-phase PFC circuit meet the first preset condition, then control one phase of the three-phase PFC circuit to stop working, and at the same time control the remaining two phases of the three-phase PFC circuit to continue working;

[0041] Among them, one phase of the three-phase PFC circuit is any one phase of the three-phase PFC circuit or one phase determined according to the first preset rotation order.

[0042] 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. At this time, one phase of the three-phase PFC circuit can be controlled not to work, and the other two phases continue to work to supply power to the load through the remaining two phases. Exemplarily, the U phase can be controlled not to work, and the V phase and the W phase can be controlled to continue working.

[0043] In a possible implementation manner, if the operating parameters of the three-phase PFC circuit meet the first preset condition, any one phase of the three-phase PFC circuit is selected, and this phase is controlled not to work, while the remaining two phases are controlled to continue working.

[0044] In a possible implementation manner, if the operating parameters of the three-phase PFC circuit meet the first preset condition, one phase is selected according to the first preset rotation order, and this phase is controlled not to work, while the remaining two phases are controlled to continue working.

[0045] Among them, the first preset rotation order can be set according to actual requirements. For example, it can be the order of U, V, W, or the order of U, W, V, etc., and no specific limitation is made here.

[0046] Through the first preset rotation order, different phases can be controlled not to work each time, so that the corresponding devices of each phase can take turns to rest, improving their service life. Exemplarily, assuming that the first preset rotation order is the order of U, V, W, then the U phase is selected to stop working this time, and the V phase is selected to stop working according to this order next time, and so on.

[0047] As can be seen from the above description, in this embodiment, by obtaining the operating parameters of the three-phase PFC circuit, when it is detected that the operating 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 remaining two phases of the three-phase PFC circuit are controlled to continue working. Thus, when the three-phase PFC circuit is in a light load, one phase can be controlled not to work, and the load is powered by two phases, which can save energy. Moreover, by making a certain phase not work, the service life of the corresponding device of this phase can be improved; in addition, any one phase of the above three-phase PFC circuit is any one phase of the three-phase PFC circuit or one phase determined according to the first preset rotation order. Selecting a certain phase that stops working according to the first preset rotation order can make each phase take turns not to work, ensuring the balanced service life of the corresponding devices of each phase and improving the availability of the three-phase PFC circuit.

[0048] In some embodiments, the "controlling one phase of the three-phase PFC circuit to stop working and at the same time controlling the remaining two phases of the three-phase PFC circuit to continue working" in S102 above may include:

[0049] If the three-phase PFC circuit is a three-phase four-wire PFC circuit, stop sending drive signals to the switching tubes corresponding to one of the three phases of the three-phase PFC circuit, and at the same time continue to send drive signals to the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit;

[0050] If the three-phase PFC circuit is a three-phase three-wire PFC circuit, stop sending drive signals to the switching tubes corresponding to one of the three phases of the three-phase PFC circuit, and at the same time adjust the duty cycles of the drive signals of the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit 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 operate in the single-phase PFC mode.

[0051] The three-phase four-wire PFC circuit is a three-phase PFC circuit with a neutral line (N line), and its structure is as Figure 2 shown. The three-phase four-wire PFC circuit includes ports U, V, W, and N for connecting to the input power supply, inductors L1, L2, and L3, capacitors C1, C2, C3, C4, and C5, and switching tubes S1, S2, S3, S4, S5, and S6. Both ends of capacitor C4 are connected to BUS+ and NBUS respectively, and both ends of capacitor C5 are connected to NBUS and BUS- respectively. The specific connection relationship of this circuit can be referred to Figure 2 , and will not be elaborated here.

[0052] Since each phase of the three-phase four-wire PFC circuit can form a loop with the neutral line, therefore, the three phases do not affect each other, and any one phase or any two phases can be controlled to stop working, and the remaining two phases or the remaining one phase can be controlled to continue working, and it can work normally without adjusting the phase.

[0053] The three-phase PFC circuit needs to continuously send drive signals to the switching tubes corresponding to each phase to make each phase work. Therefore, when the three-phase PFC circuit is a three-phase four-wire PFC circuit, only need to stop sending drive signals to the switching tubes corresponding to one of the three phases of the three-phase PFC circuit, then this phase will stop working, and continue to send drive signals to the switching tubes corresponding to the remaining two phases, then the remaining two phases can continue to work. Among them, in the three-phase four-wire PFC circuit, the drive signals sent to each switching tube corresponding to the remaining two phases can remain the same as the drive signals sent to this switching tube when the three phases work together, and no adjustment is required.

[0054] Refer to Figure 2 , the switching tubes corresponding to phase U are S1 and S2, the switching tubes corresponding to phase V are S3 and S4, and the switching tubes corresponding to phase W are S5 and S6. When controlling phase V not to work, stop sending drive signals to S3 and S4, and continue to send drive signals to S1, S2, S5, and S6.

[0055] It should be noted that continuing to send drive signals to the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit does not mean sending the same drive signals to the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit. It is just a way of saying the opposite of stopping sending drive signals.

[0056] The three-phase three-wire PFC circuit is a PFC circuit without a neutral line, and its structure is as Figure 3 shown. 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 switching tubes S1, S2, S3, S4, S5, and S6. The two ends of capacitor C4 are respectively connected to BUS+ and BUS-. The specific connection relationship of this circuit can be referred to Figure 3 , and will not be elaborated here.

[0057] Since the three-phase three-wire PFC has no neutral line, at least two phases are required to form a loop. That is to say, the three-phase three-wire PFC can control at most one phase to stop working and cannot control two phases to stop working. After controlling two of the three phases of the three-phase three-wire PFC circuit to stop working, the circuit can no longer work normally.

[0058] In the three-phase three-wire PFC circuit, controlling one phase to stop working and the remaining two phases to continue working not only requires turning off the drive of the phase to be stopped, but also requires adjusting the duty cycle of the drive signals of the switching tubes corresponding to the remaining two phases, so as to adjust the current phase of the remaining two phases and make 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 drive signals sent to each switching tube to be working are different from those sent to the switching tube to be working in the working mode of the three-phase PFC. Therefore, it is necessary to adjust the duty cycle of the drive signals of the switching tubes corresponding to the remaining two phases.

[0059] Refer to Figure 3 , assuming that the V phase stops working and the U and W phases 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. At this time, it is equivalent to a single-phase PFC of L-N.

[0060] Refer to Figure 4 , Figure 4 On the left is the current phase of the three phases when all three phases of the three-phase three-wire PFC circuit are working, Figure 4 On the right is the current phase of the single-phase PFC composed of the U and W phases after the V phase is turned off. Compared with the original current phase of the U phase, this current phase has changed by 30 degrees. This change can be achieved by adjusting the duty cycle of the corresponding drive signals, and specific adjustments can be made using existing methods, which will not be elaborated here.

[0061] In some embodiments, the operating parameters of the three-phase PFC circuit include the input current of the three-phase PFC circuit;

[0062] The first preset condition is that the input current of the three-phase PFC circuit is less than the first preset current threshold.

[0063] In this embodiment, it is determined whether the three-phase PFC circuit is in a light load state by the input current. 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, while the remaining two phases of the three-phase PFC circuit are controlled to continue working.

[0064] Among them, the first preset current threshold can be set according to actual needs without specific limitation.

[0065] In some embodiments, 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 duration.

[0066] In this embodiment, in order to prevent misjudgment or prevent one phase from repeatedly switching between the working state and the non-working state, on the basis of determining that the input current is less than the first preset current threshold, an additional condition is added, and at the same time, it is determined whether the duration for which the input current is less than the first preset current threshold is greater than the first preset duration. 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, while the remaining two phases of the three-phase PFC circuit are controlled to continue working.

[0067] Among them, the first preset duration can be set according to actual needs. For example, it can be 5 seconds, 10 seconds, etc.

[0068] In some embodiments, after obtaining the operating parameters of the three-phase PFC circuit, the control method of the three-phase PFC circuit further includes:

[0069] If the operating parameters of the three-phase PFC circuit meet the second preset condition and the three-phase PFC circuit is a three-phase four-wire PFC circuit, then 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 working;

[0070] Among them, two phases of the three-phase PFC circuit are any two phases of the three-phase PFC circuit or two phases determined according to the second preset rotation order.

[0071] When the operating parameters of the three-phase PFC circuit meet the second preset condition, the three-phase PFC circuit is in a light load state to a different extent from when the operating parameters of the three-phase PFC circuit meet the first preset condition. The load rate of the three-phase PFC circuit when its operating parameters meet the second preset condition is less than the load rate of the three-phase PFC circuit when its operating parameters meet the first preset condition.

[0072] For example, when the operating 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 operating parameters of the three-phase PFC circuit meet the second preset condition, the load rate of the three-phase PFC circuit is 30%.

[0073] Since the three-phase four-wire PFC circuit can retain only one phase for operation, when the circuit meets the second preset condition, two of the three phases of the circuit can be controlled to stop working, and at the same time, the remaining one phase can be controlled to continue working.

[0074] Among them, the second preset rotation sequence and the first preset rotation sequence can be the same or different, and no specific limitation is made here.

[0075] In some embodiments, controlling two of the three phases of the three-phase PFC circuit to stop working and at the same time controlling the remaining one phase of the three-phase PFC circuit to continue working includes:

[0076] Stop sending drive signals to the switching tubes corresponding to two of the three phases of the three-phase PFC circuit, and at the same time continue to send drive signals to the switching tubes corresponding to the remaining one phase of the three-phase PFC circuit.

[0077] According to the foregoing description, any two phases of the three-phase four-wire PFC circuit do not affect each other. Therefore, to control two of the phases to stop working, it is only necessary to directly turn off the drive of the switching tubes corresponding to these two phases, and the drive of the switching tubes of the remaining one phase continues to be maintained.

[0078] See Figure 5 , Figure 5 On the left are the current phases of the three phases when all three phases of the three-phase four-wire PFC circuit are working. Figure 5 The implementation arrow on the right is the current phase of phase U of the three-phase four-wire PFC circuit after phases V and W are turned off. Since there is a neutral line, turning off phases V and W does not affect the current phase of phase U, and the current flows from U to N.

[0079] In some embodiments, the operating parameters of the three-phase PFC circuit include the input current of the three-phase PFC circuit;

[0080] 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.

[0081] Among them, the second preset current threshold is less than the first preset current threshold. The second preset current threshold can be set according to actual requirements and is not specifically limited herein.

[0082] 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 duration for which 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 is greater than the first preset duration.

[0083] The first preset duration and the second preset duration may be equal or may not be equal, without specific limitation. The second preset duration can be set according to actual requirements. For example, it can be 5 seconds, 10 seconds, etc.

[0084] In a possible implementation manner, after controlling two of the three phases of the three-phase PFC circuit to stop working and simultaneously controlling the remaining one phase of the three-phase PFC circuit to continue working, the control method of the three-phase PFC circuit further includes:

[0085] 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 condition, and the operating parameters of the three-phase PFC circuit meet the first preset condition, then control any one of the two phases that have stopped working to resume working, or control both of the two phases that have stopped working (two of the three phases of the three-phase PFC circuit) to resume working, and simultaneously control the one phase that is working (the remaining one phase of the three-phase PFC circuit) to stop working;

[0086] 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 condition, and the operating parameters of the three-phase PFC circuit do not meet the first preset condition, then control both of the two phases that have stopped working to resume working, that is, control all three phases to work.

[0087] In a possible implementation manner, after "controlling one of the three phases of the three-phase PFC circuit to stop working and simultaneously controlling the remaining two phases of the three-phase PFC circuit to continue working" in the above S102, the control method of the three-phase PFC circuit further includes:

[0088] If the operating parameters of the three-phase PFC circuit do not meet the first preset condition, and the operating parameters of the three-phase PFC circuit do not meet the second preset condition, then control the one phase that has stopped working of the three-phase PFC circuit to resume working, that is, control all three phases to work.

[0089] It should be understood that the sequence numbers of the steps in the above embodiments do not indicate the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0090] The following is an apparatus embodiment of the present invention. For details not described in detail, reference may be made to the corresponding method embodiments above.

[0091] Figure 6 The structural schematic diagram of the control device of the three-phase PFC circuit provided by the embodiment of the present invention is shown. For the sake of convenience of description, only the parts related to the embodiment of the present invention are shown and are described in detail as follows:

[0092] As Figure 6 shown, the control device 100 of the three-phase PFC circuit includes: an acquisition module 101 and a first control module 102.

[0093] The acquisition module 101 is used to acquire the working parameters of the three-phase PFC circuit;

[0094] The first control module 102 is used to control one phase of the three-phase PFC circuit to stop working and at the same time control the remaining two phases of the three-phase PFC circuit to continue working if the working parameters of the three-phase PFC circuit meet the first preset condition;

[0095] Wherein, one phase of the three-phase PFC circuit is any one phase of the three-phase PFC circuit or one phase determined according to the first preset rotation order.

[0096] In a possible implementation manner, the first control module 102 is specifically used for:

[0097] If the three-phase PFC circuit is a three-phase four-wire PFC circuit, stop sending a driving signal to the switching tube corresponding to one phase of the three-phase PFC circuit, and at the same time continue to send a driving signal to the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit;

[0098] If the three-phase PFC circuit is a three-phase three-wire PFC circuit, stop sending a driving signal to the switching tube corresponding to one phase of the three-phase PFC circuit, and at the same time adjust the duty cycle of the driving signals of the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit 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.

[0099] In a possible implementation manner, the working parameters of the three-phase PFC circuit include the input current of the three-phase PFC circuit;

[0100] The first preset condition is that the input current of the three-phase PFC circuit is less than the first preset current threshold.

[0101] In a possible implementation, 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 duration.

[0102] In a possible implementation, the control device 100 of the three-phase PFC circuit further includes: a second control module.

[0103] The second control module is configured to, 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 of the three phases of the three-phase PFC circuit to stop operating, and at the same time control the remaining one phase of the three-phase PFC circuit to continue operating;

[0104] wherein, two of the three phases of the three-phase PFC circuit are any two phases of the three-phase PFC circuit or two phases determined according to the second preset rotation sequence.

[0105] In a possible implementation, the second control module is specifically configured to:

[0106] Stop sending drive signals to the switching tubes corresponding to two of the three phases of the three-phase PFC circuit, and at the same time continue to send drive signals to the switching tubes corresponding to the remaining one phase of the three-phase PFC circuit.

[0107] In a possible implementation, the operating parameters of the three-phase PFC circuit include the input current of the three-phase PFC circuit;

[0108] The second preset condition is that the input current of the three-phase PFC circuit is less than the second preset current threshold.

[0109] In a possible implementation, 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.

[0110] Figure 7 is a schematic diagram of the terminal provided by the embodiments of the present invention. As Figure 7 shown, 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 method of each three-phase PFC circuit are implemented, such as Figure 1 S101 to S102 shown. Alternatively, when the processor 110 executes the computer program 112, the functions of each module / unit in the above-mentioned device embodiments are implemented, such as Figure 6 the functions of the modules / units 101 to 102 shown.

[0111] Exemplarily, the computer program 112 can 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 implement the present invention. The one or more modules / units can be a series of computer program instruction segments capable of accomplishing specific functions, and these instruction segments are used to describe the execution process of the computer program 112 in the terminal 11. For example, the computer program 112 can be divided into Figure 6 the illustrated modules / units 101 to 102.

[0112] The terminal 11 can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server, etc. 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 Figure 7 merely being examples of the terminal 11, they do not constitute a limitation on the terminal 11, and it may include more or fewer components than shown in the figure, or combine certain components, or different components. For example, the terminal may further include input / output devices, network access devices, a bus, etc.

[0113] The so-called processor 110 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0114] The memory 111 may be an internal storage unit of the terminal 11, such as the hard disk or 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 equipped on the terminal 11, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory 111 may also include both the internal storage unit and the external storage device of the terminal 11. 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 is to be output.

[0115] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated here.

[0116] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0117] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0118] In the embodiments provided by the present invention, it should be understood that the disclosed device / terminal and method can be implemented in other ways. For example, the device / terminal embodiments described above are only illustrative. For example, the division of the module or unit is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other form.

[0119] The unit described as a separated component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0120] In addition, each functional unit in various embodiments of the present invention may be integrated into a processing unit, may exist physically alone for each unit, 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 in the form of software functional units.

[0121] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above-mentioned embodiment methods of the present invention, it may also be completed by instructing relevant hardware through a computer program. The computer program may be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned control method embodiments of each three-phase PFC circuit can be implemented. Among them, 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, etc. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium 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 medium does not include electrical carrier signals and telecommunication signals.

[0122] The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; 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: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; 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 each embodiment of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A control method for a three-phase PFC circuit, characterized in that, it includes: Obtaining the operating parameters of the three-phase PFC circuit; the three-phase PFC circuit is a three-phase four-wire PFC circuit or a three-phase three-wire PFC circuit; the three-phase PFC circuit is an AC-DC circuit; If the operating parameters of the three-phase PFC circuit meet the first preset condition, 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, while the remaining two phases of the three-phase PFC circuit are controlled to continue working; The controlling the remaining two phases of the three-phase PFC circuit to continue working includes: controlling the remaining two phases of the three-phase PFC circuit to work in the single-phase PFC mode, or, controlling the operating modes of the remaining two phases of the three-phase PFC circuit to remain unchanged; Wherein, one phase of the three-phase PFC circuit is any phase of the three-phase PFC circuit or one phase determined according to the first preset rotation sequence.

2. The control method for a three-phase PFC circuit according to claim 1, characterized in that, The controlling one phase of the three-phase PFC circuit to stop working and at the same time controlling the remaining two phases of the three-phase PFC circuit to continue working includes: If the three-phase PFC circuit is a three-phase four-wire PFC circuit, stop sending a driving signal to the switching tube corresponding to one phase of the three-phase PFC circuit, and at the same time continue to send driving signals to the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit; If the three-phase PFC circuit is a three-phase three-wire PFC circuit, stop sending a driving signal to the switching tube corresponding to one phase of the three-phase PFC circuit, and at the same time adjust the duty cycle of the driving signals of the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit 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 for a three-phase PFC circuit according to claim 1, characterized in that, The operating 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.

4. The control method for a three-phase PFC circuit according to claim 3, characterized in that, 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 duration.

5. The control method for a three-phase PFC circuit according to any one of claims 1 to 4, characterized in that, 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 meet the second preset condition and the three-phase PFC circuit is a three-phase four-wire PFC circuit, then control two phases of the three-phase PFC circuit to stop working, and at the same time control the remaining one phase of the three-phase PFC circuit to continue working; Among them, two phases of the three-phase PFC circuit are any two phases of the three-phase PFC circuit or two phases determined according to a second preset rotation order.

6. The control method of the three-phase PFC circuit according to claim 5, wherein, controlling two phases of the three-phase PFC circuit to stop working, and at the same time controlling the remaining one phase of the three-phase PFC circuit to continue working, includes: stopping sending drive signals to the switching tubes corresponding to two phases of the three-phase PFC circuit, and at the same time continuing to send drive signals to the switching tubes corresponding to the remaining one phase of the three-phase PFC circuit.

7. The control method of the three-phase PFC circuit according to claim 5, wherein, 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 a second preset current threshold.

8. The control method of the 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 duration for which the input current of the three-phase PFC circuit is less than the second preset current threshold is greater than a second preset duration.

9. A terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein, when the processor executes the computer program, the steps of the control method of the three-phase PFC circuit according to any one of claims 1 to 8 above are implemented.

10. A computer-readable storage medium storing a computer program, wherein, when the computer program is executed by a processor, the steps of the control method of the three-phase PFC circuit according to any one of claims 1 to 8 above are implemented.

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