Single-phase current source detection method for power supply circuit

Abstract

The present application provides a single-phase current source detection method for a power supply circuit, which is applied to the power supply circuit, and the method includes: sampling and determining that V_A, V_B, and V_C are equal and greater than a preset phase voltage threshold through a sampling circuit; detecting that the power supply mode of the three-phase current source is a single-phase power supply mode, and determining V_bus_ref; adjusting the single-phase input mode of the input mode switching circuit, and determining the detection result of the single-phase current source power supply phase according to the sampled V_bus_rea and V_bus_ref in the adjusted single-phase input mode, and the detection result includes A-phase current source power supply, B-phase current source power supply, or C-phase current source power supply. By adjusting the input mode of the input mode switching circuit, the interference of the filter circuit introduced by the use of the phase voltage in the single-phase power supply phase detection process to the sampling circuit is eliminated, and the operating efficiency of the power supply circuit is improved.

Description

Technical Field

[0001] The present application relates to the technical field related to circuits of an AC power supply system, and in particular to a single-phase current source detection method for a power supply circuit. Background Art

[0002] In a three-phase four-wire system, the power supply circuit can be compatible with both three-phase input and single-phase input. Figure 1 Taking the power supply circuit shown in the figure as an example, the power supply circuit includes a three-phase current source, a sampling circuit, a control circuit, an input mode switching circuit, a rectifier circuit (the figure shows a three-phase three-level Vienna rectifier circuit) and a load circuit. The input mode switching circuit on the input side of the rectifier circuit can realize the real-time switching between single-phase input and three-phase input. The sampling circuit on the output side of the three-phase current source can realize the acquisition of the three-phase phase voltage of the power supply circuit. In practical applications, the first capacitor C1, the second capacitor C2 and the third capacitor C3 for suppressing electromagnetic interference are added between the power grid and the rectifier circuit. AN 、V BN and V CN The equivalent circuit in the state is as follows Figure 2 As shown (in the figure, the symbols A, B, and C correspond to the A phase, the B phase, and the C phase respectively, and N represents the center line. The first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 constitute a sampling circuit, wherein the first capacitor C1 is connected across the A phase and the B phase, the second capacitor C2 is connected across the B phase and the C phase, the third capacitor C3 is connected across the C phase and the A phase, the first resistor R1 and the second resistor R2 are connected in series between the A phase and the center line N line, the third resistor R3 and the fourth resistor R4 are connected in series between the B phase and the center line N line, and the fifth resistor R5 and the sixth resistor R6 are connected in series between the C phase and the center line N line), in a single-phase input (taking AN power supply as an example, the figure is V AN The equivalent circuit in the state is as follows Figure 3 As shown (marked with Figure 2 The same symbols have the same meanings and will not be repeated here).

[0003] Under the power frequency 50Hz grid voltage, the impedance X_first capacitor C1~X_third capacitor C3 corresponding to the first capacitor C1-third capacitor C3 is very low, much smaller than the resistance. Therefore, in the case of single-phase input, the actual sampled phase voltage V_SA=V_SB=V_SC, and it is impossible to distinguish which phase has power based on the phase voltage. Summary of the invention

[0004] An embodiment of the present application provides a single-phase current source detection method for a power supply circuit. By adjusting the input mode of the input mode switching circuit, the interference of the filtering circuit introduced by the phase voltage used in the single-phase power supply phase detection process on the sampling circuit is eliminated, and the single-phase power supply phase is quickly and accurately identified for corresponding mode switching and electrical control, thereby improving the operating efficiency of the power supply circuit.

[0005] In a first aspect, an embodiment of the present application provides a single-phase current source detection method for a power supply circuit, which is applied to a control circuit of the power supply circuit, wherein the power supply circuit includes a three-phase current source, a filter circuit, a sampling circuit, an input mode switching circuit, a rectifier circuit, the control circuit and a load circuit, wherein the three-phase current source is respectively connected to the filter circuit, the sampling circuit, the input mode switching circuit and the control circuit, the input mode switching circuit is connected to the rectifier circuit, the rectifier circuit is connected to the load circuit, and the input mode supported by the input mode switching circuit includes a three-phase input mode and a single-phase input mode, and the single-phase input mode includes an A-phase input mode, a B-phase input mode and a C-phase input mode; the method includes:

[0006] The sampling circuit samples and determines that the phase voltage V_A of the phase A, the phase voltage V_B of the phase B, and the phase voltage V_C of the phase C of the three-phase current source are equal and are all greater than the preset phase voltage threshold, and marks the power supply mode of the three-phase current source as a single-phase power supply mode;

[0007] It is detected that the power supply mode of the three-phase current source is the single-phase power supply mode, and a reference bus voltage threshold value V_bus_ref for detecting a drop state of the bus voltage V_bus of the rectifier circuit is determined;

[0008] By adjusting the single-phase input mode of the input mode switching circuit, and determining the detection result of the single-phase current source power supply phase according to the sampled real values ​​V_bus_rea and V_bus_ref of V_bus in the adjusted single-phase input mode, the detection result includes A-phase current source power supply, B-phase current source power supply or C-phase current source power supply.

[0009] In a second aspect, an embodiment of the present application provides a power supply circuit, the power supply circuit comprising a three-phase current source, a filter circuit, a sampling circuit, an input mode switching circuit, a rectifier circuit, a control circuit and a load circuit, the three-phase current source is respectively connected to the filter circuit, the sampling circuit, the input mode switching circuit and the control circuit, the input mode switching circuit is connected to the rectifier circuit, the rectifier circuit is connected to the load circuit, the input mode supported by the input mode switching circuit includes a three-phase input mode and a single-phase input mode, and the single-phase input mode includes an A-phase input mode, a B-phase input mode and a C-phase input mode;

[0010] The control circuit is used to sample and determine through the sampling circuit that the phase voltage V_A of the phase A, the phase voltage V_B of the phase B, and the phase voltage V_C of the phase C of the three-phase current source are equal and are all greater than a preset phase voltage threshold, and mark the power supply mode of the three-phase current source as a single-phase power supply mode;

[0011] It is also used to detect that the power supply mode of the three-phase current source is the single-phase power supply mode, and determine a reference bus voltage threshold value V_bus_ref for detecting a drop state of the bus voltage V_bus of the rectifier circuit;

[0012] It is also used to adjust the single-phase input mode of the input mode switching circuit, and determine the detection result of the single-phase current source power supply phase according to the sampled real values ​​V_bus_rea and V_bus_ref of V_bus in the adjusted single-phase input mode, and the detection result includes A-phase current source power supply, B-phase current source power supply or C-phase current source power supply.

[0013] In a third aspect, an embodiment of the present application provides a single-phase current source detection device for a power supply circuit, which is applied to a control circuit of a power supply circuit, wherein the power supply circuit includes a three-phase current source, a filter circuit, a sampling circuit, an input mode switching circuit, a rectifier circuit, the control circuit and a load circuit, wherein the three-phase current source is respectively connected to the filter circuit, the sampling circuit, the input mode switching circuit and the control circuit, the input mode switching circuit is connected to the rectifier circuit, the rectifier circuit is connected to the load circuit, and the input mode supported by the input mode switching circuit includes a three-phase input mode and a single-phase input mode, and the single-phase input mode includes an A-phase input mode, a B-phase input mode and a C-phase input mode; the device includes:

[0014] A sampling unit, used to sample and determine through the sampling circuit that the phase voltage V_A of phase A, the phase voltage V_B of phase B, and the phase voltage V_C of phase C of the three-phase current source are equal and are all greater than a preset phase voltage threshold, and mark the power supply mode of the three-phase current source as a single-phase power supply mode;

[0015] a detection unit, configured to detect that the power supply mode of the three-phase current source is the single-phase power supply mode, and determine a reference bus voltage threshold value V_bus_ref for detecting a drop state of the bus voltage V_bus of the rectifier circuit;

[0016] A determination unit is used to adjust the single-phase input mode of the input mode switching circuit, and determine the detection result of the single-phase current source power supply phase according to the real values ​​V_bus_rea and V_bus_ref of the sampled V_bus in the adjusted single-phase input mode, wherein the detection result includes A-phase current source power supply, B-phase current source power supply or C-phase current source power supply.

[0017] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program enables a computer to execute part or all of the steps described in any method of the first aspect of the embodiment of the present application.

[0018] In a fifth aspect, an embodiment of the present application provides a computer program product, wherein the computer program product includes a computer program, and the computer program is operable to cause a computer to execute some or all of the steps described in any method of the first aspect of the embodiment of the present application. The computer program can be a software installation package.

[0019] It can be seen that in the embodiment of the present application, the power supply circuit includes a three-phase current source, a filter circuit, a sampling circuit, an input mode switching circuit, a rectifier circuit, a control circuit and a load circuit, the three-phase current source is respectively connected to the filter circuit, the sampling circuit, the input mode switching circuit and the control circuit, the input mode switching circuit is connected to the rectifier circuit, the rectifier circuit is connected to the load circuit, the input mode supported by the input mode switching circuit includes a three-phase input mode and a single-phase input mode, and the single-phase input mode includes an A-phase input mode, a B-phase input mode and a C-phase input mode; the control circuit can detect that the power supply circuit is in In single-phase power supply mode, the single-phase input mode of the input mode switching circuit is adjusted, and the detection result of the single-phase current source power supply phase is determined according to V_bus_rea and V_bus_ref in the adjusted single-phase input mode. Since V_bus_rea and V_bus_ref are not interfered by the filter circuit, there is no need to analyze the phase voltage interfered by the filter circuit, thereby eliminating the problem of interference of the capacitor in the input side filter circuit with the voltage sampling circuit due to phase voltage detection, which is conducive to quickly and accurately identifying the single-phase power supply phase for corresponding mode switching and electrical control, thereby improving the operating efficiency of the power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a circuit diagram of a power supply circuit provided with an input mode switching circuit and a sampling circuit provided in the present application;

[0021] Figure 2It is a circuit schematic diagram of a power supply circuit provided with a filter circuit and a sampling circuit in a three-phase input mode provided by the present application;

[0022] Figure 3 It is a circuit schematic diagram of a power supply circuit provided with a filter circuit and a sampling circuit in a single-phase input mode provided by the present application;

[0023] Figure 4 It is a circuit diagram of a power supply circuit provided by the present application;

[0024] Figure 5 It is a circuit diagram of a filtering circuit and a sampling circuit provided by the present application;

[0025] Figure 6 It is a circuit diagram of an input mode switching circuit and a rectifier circuit provided by the present application;

[0026] Figure 7 It is a flow chart of a single-phase current source detection method for a power supply circuit provided by the present application;

[0027] Figure 8 This is an example diagram of a waveform analysis of bus voltage under different circuit states provided by the present application;

[0028] Fig. 9 It is a structural schematic diagram of a single-phase current source detection device for a power supply circuit provided by the present application;

[0029] Fig.10 It is a structural schematic diagram of another single-phase current source detection device for a power supply circuit provided in the present application. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described below in conjunction with the accompanying drawings.

[0031] The "embodiment" mentioned in this article means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the present application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. "Or" means that two relationships may exist, such as only A exists, only B exists; when A and B are not mutually exclusive, it can also mean that there are three relationships, such as only A exists, only B exists, and A and B exist at the same time. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c".

[0033] It should be noted that the connections between the circuit units and circuit devices described in this application are all electrical connection relationships, and the specific implementation methods of the electrical connection relationships can be various, such as connection between contacts, wire connection, socket connection, etc., which are not limited here.

[0034] like Figure 4 As shown, an embodiment of the present application provides a circuit schematic diagram of a power supply circuit 10, which includes a three-phase current source 100, a filter circuit 110, a sampling circuit 120, an input mode switching circuit 130, a rectifier circuit 140, the control circuit 150 and a load circuit 160. The three-phase current source 100 is respectively connected to the filter circuit 110, the sampling circuit 120, the input mode switching circuit 130 and the control circuit 150, the input mode switching circuit 130 is connected to the rectifier circuit 140, and the rectifier circuit 140 is connected to the load circuit 160. The input modes supported by the input mode switching circuit 130 include a three-phase input mode and a single-phase input mode, and the single-phase input mode includes an A-phase input mode, a B-phase input mode and a C-phase input mode.

[0035] The filter circuit 110 is used to suppress electromagnetic interference between the power grid and the rectifier circuit 140 .

[0036] The rectifier circuit 140 may be, for example, a Vienna rectifier circuit, the control circuit 150 may be, for example, a microcontroller, and the load circuit 160 may be, for example, a household appliance such as a fan.

[0037] like Figure 5As shown, an embodiment of the present application provides a circuit schematic diagram of a filtering circuit 110 and a sampling circuit 120, wherein the filtering circuit includes a first capacitor C1, a second capacitor C2, and a third capacitor C3, and the A phase is connected to the first end of the first capacitor C1 and the first end of the third capacitor C3, the B phase is connected to the second end of the first capacitor C1 and the first end of the second capacitor C2, and the C phase is connected to the second end of the second capacitor C2 and the second end of the third capacitor C3.

[0038] The sampling circuit 120 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6, wherein:

[0039] A first end of the first resistor R1 is connected to the A phase and a first end of the first capacitor C1, and a second end of the first resistor R1 is connected to a first end of the second resistor R2.

[0040] A first end of the third resistor R3 is connected to the B phase, a second end of the first capacitor C1 and a first end of the second capacitor C2, and a second end of the third resistor R3 is connected to a first end of a fourth resistor R4.

[0041] A first end of the fifth resistor R5 is connected to the C phase, the second end of the second capacitor C2 and the second end of the third capacitor C3, and a second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6.

[0042] The second end of the second resistor R2 , the second end of the fourth resistor R4 , and the second end of the sixth resistor R6 are all connected to the neutral line N of the three-phase current source.

[0043] like Figure 6 As shown, the embodiment of the present application provides a circuit diagram of an input mode switching circuit 130 and a rectifier circuit 140 (shown as a Vienna rectifier circuit), wherein the input mode switching circuit 130 includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, and a sixth switch K6; wherein,

[0044] The first port K31 of the third switch K3 is connected to the A phase, and the second port K32 of the third switch K3 is connected to the A phase rectifier bridge arm of the rectifier circuit;

[0045] The first port K11 of the first switch K1 is connected to the B phase, the second port K12 of the first switch K1 is connected to the first port K61 of the sixth switch K6, the second port K62 of the sixth switch K6 is connected to the N line, the third port K13 of the first switch K1 is connected to the first port K41 of the fourth switch K4, and the second port K42 of the fourth switch K4 is connected to the B phase rectifier bridge arm of the rectifier circuit;

[0046] The first port K21 of the second switch K2 is connected to the C phase, the second port K22 of the second switch K2 is connected to the first port K61 of the sixth switch K6, the third port K23 of the second switch K2 is connected to the first end of the fifth switch K5, and the second port K52 of the fifth switch K5 is connected to the C phase rectifier bridge arm of the rectifier circuit;

[0047] The three-phase input mode corresponds to that the first port K11 of the first switch K1, the third port K13 of the first switch K1, the first port K21 of the second switch K2, the third port K23 of the second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5 are all turned on, and the sixth switch K6 is turned off;

[0048] The AN phase power supply mode corresponds to the third switch K3, the fourth switch K4, the third port K13 of the first switch K1, the second port K12 of the first switch K1, the sixth switch K6, the first port K21 of the second switch K2, and the third port K23 of the second switch K2 being turned on, and the fifth switch K5 being turned off; wherein the third switch K3, the fourth switch K4, the third port K13 of the first switch K1, the second port K12 of the first switch K1, and the sixth switch K6 are turned on to enable the A phase and the N line to be turned on through the first circuit, and the first circuit refers to the third switch K3, the rectifier circuit The circuit composed of the related devices of 140 (specifically, the first inductor L1, the fourth capacitor C4, the fifth capacitor C5, the fourth diode D4, the second inductor L2 in the positive half cycle, and the third diode D3, the fourth capacitor D4, the fifth capacitor D5, the second diode D2 in the negative half cycle), the fourth switch K4, the first switch K1, and the sixth switch K6 is turned on; the second port K12 of the first switch K1 and the sixth switch K6 are also turned on to disconnect the B phase; the first port K21 of the second switch K2 and the third port K23 of the second switch K2 are turned on, and the fifth switch K5 is turned off to disconnect the C phase and not connect to the N line;

[0049] In the BN phase power supply mode, the first port K11 of the first switch K1, the third port K13 of the first switch K1, the fourth switch K4, the fifth switch K5, the third port K23 of the second switch K2, the second port K22 of the second switch K2, and the sixth switch K6 are turned on, and the third switch K3 is turned off;

[0050] The CN phase power supply mode corresponds to the first port K21 of the second switch K2, the third port K23 of the second switch K2, the fifth switch K5, the fourth switch K4, the third port K13 of the first switch K1, the second port K12 of the first switch K1, and the sixth switch K6 being turned on, and the third switch K3 being turned off.

[0051] Among them, the A-phase rectifier bridge arm of the rectifier circuit 140 corresponds to the first inductor L1, the first bidirectional switch tube Q1, and the second bidirectional switch tube Q2, the B-phase rectifier bridge arm corresponds to the second inductor L2, the third bidirectional switch tube Q3, and the fourth bidirectional switch tube Q4, and the C-phase rectifier bridge arm corresponds to the third inductor L3, the fifth bidirectional switch tube Q5, and the sixth bidirectional switch tube Q6. The Vienna rectifier circuit is composed of the first inductor L1, the second inductor L2, the third inductor L3, the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, the sixth diode D6, the fourth capacitor C4, the fifth capacitor C5, and the first bidirectional switch tube Q1-sixth bidirectional switch tube Q6. The connection relationship of these components is the same as that of the existing Vienna rectifier circuit, and will not be repeated here.

[0052] Among them, the first switch K1 or the second switch K2 can be a double-contact selection type relay, or can be realized by connecting multiple unidirectional relays in parallel, and the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 can be unidirectional relays, single-pole single-throw switches, etc.

[0053] In a specific implementation, the sampling value of the bus voltage V_bus of the rectifier circuit can be determined by sampling the potential difference between the points on both sides of the series-connected fourth capacitor C4 and fifth capacitor C5 branches. The first point is, for example, the first end of the fourth capacitor C4, which is connected to the cathode of the first diode D1, the third diode D3, and the fifth diode D5. The second point is, for example, the first end of the fifth capacitor C5, which is connected to the anode of the second diode D2, the fourth diode D4, and the sixth diode D6.

[0054] Among them, the first end of the first inductor L1 is connected to the second port K32 of the third switch K3, the second end of the first inductor L1 is connected to the anode of the first diode D1, the cathode of the second diode D2 and the first end of the first bidirectional switch tube Q1 (the first end of the first bidirectional switch tube Q1 corresponds to the cathode of the diode of the first bidirectional switch tube Q1 and the drain of the MOS tube of the first bidirectional switch tube Q1 in the figure), the second end of the first bidirectional switch tube Q1 (corresponding to the anode of the diode of the first bidirectional switch tube Q1 and the source of the MOS tube of the first bidirectional switch tube Q1 in the figure) is connected to the first end of the second bidirectional switch tube Q2 (corresponding to the anode of the diode of the second bidirectional switch tube Q2 and the source of the MOS tube of the second bidirectional switch tube Q2 in the figure), and the second inductor L1 is connected to the anode of the diode of the second bidirectional switch tube Q1 and the cathode of the second bidirectional switch tube Q2. The first end of the third inductor L3 is connected to the second port K52 of the fifth switch K5, and the second end of the third inductor L3 is connected to the anode of the fifth diode D5, the cathode of the sixth diode D6, and the first end of the fifth bidirectional switch Q5 (the first end of the third bidirectional switch Q5 corresponds to the cathode of the diode of the fifth bidirectional switch Q5 and the drain of the MOS tube of the fifth bidirectional switch Q5). The drain of the fifth bidirectional switch tube Q5 is connected to the first end of the sixth bidirectional switch tube Q6 (the anode of the diode of the sixth bidirectional switch tube Q6 and the drain of the MOS tube of the sixth bidirectional switch tube Q6 are connected to the cathode of the first diode D1, the cathode of the third diode D3 and the cathode of the fifth diode D5 are connected to the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is connected to the second end of the second bidirectional switch tube Q2 (the cathode of the diode of the second bidirectional switch tube Q2 and the drain of the MOS tube of the first bidirectional switch tube Q1 are connected to the second end of the fourth bidirectional switch tube Q4 (the cathode of the diode of the fourth bidirectional switch tube Q4 and the drain of the MOS tube of the first bidirectional switch tube Q1 are connected to the cathode of the third diode D3 and the drain of the MOS tube of the first bidirectional switch tube Q1 are connected to the cathode of the fifth bidirectional switch tube Q5 and the drain of the MOS tube of the first bidirectional switch tube Q2 are connected to the cathode of the first diode D1 and the cathode of the fifth diode D5. The cathode of the diode of the sixth bidirectional switch tube Q4 and the drain of the MOS tube of the fourth bidirectional switch tube Q4), the second end of the sixth bidirectional switch tube Q6 (corresponding to the cathode of the diode of the sixth bidirectional switch tube Q6 and the drain of the MOS tube of the sixth bidirectional switch tube Q6 in the figure) and the first end of the fifth capacitor C5, the second end of the fifth capacitor C5 is connected to the anode of the second diode D2, the anode of the fourth diode D4 and the anode of the sixth diode D6, the second end of the third bidirectional switch tube Q3 (corresponding to the anode of the diode of the third bidirectional switch tube Q3 and the drain of the MOS tube of the third bidirectional switch tube Q3 in the figure) is connected to the first end of the fourth bidirectional switch tube Q4 (corresponding to the anode of the diode of the fourth bidirectional switch tube Q4 and the drain of the MOS tube of the fourth bidirectional switch tube Q4 in the figure).

[0055] like Figure 7 As shown, the embodiment of the present application provides a single-phase current source detection method for a power supply circuit of a control circuit 150 applied to the above-mentioned power supply circuit 10, comprising the following steps:

[0056] S700, sampling and determining through the sampling circuit that the phase voltage V_A of the phase A, the phase voltage V_B of the phase B, and the phase voltage V_C of the phase C of the three-phase current source are equal and are all greater than a preset phase voltage threshold, and marking the power supply mode of the three-phase current source as a single-phase power supply mode;

[0057] Among them, the single-phase power supply mode includes an AN phase power supply mode, a BN phase power supply mode and a CN phase power supply mode.

[0058] S720, detecting that the power supply mode of the three-phase current source is the single-phase power supply mode, and determining a reference bus voltage threshold V_bus_ref for detecting a drop state of the bus voltage V_bus of the rectifier circuit;

[0059] Before marking the power supply mode of the three-phase current source as the single-phase power supply mode, the input mode of the input mode switching circuit is configured as the three-phase input mode; the power frequency of the three-phase current source is 50HZ;

[0060] The difference between the capacitive reactance of the first capacitor C1, the second capacitor C2, and the third capacitor C3 in the single-phase input mode and the equivalent resistance of the circuit branches to which the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 belong makes V_A, V_B, and V_C equal and all greater than the preset phase voltage threshold.

[0061] S740, adjusting the single-phase input mode of the input mode switching circuit, and determining the detection result of the power supply phase of the single-phase current source according to the real values ​​V_bus_rea and V_bus_ref of the sampled V_bus in the adjusted single-phase input mode;

[0062] The detection result includes A-phase current source power supply, B-phase current source power supply or C-phase current source power supply.

[0063] It can be seen that in the embodiment of the present application, the power supply circuit includes a three-phase current source, a filter circuit, a sampling circuit, an input mode switching circuit, a rectifier circuit, a control circuit and a load circuit, the three-phase current source is respectively connected to the filter circuit, the sampling circuit, the input mode switching circuit and the control circuit, the input mode switching circuit is connected to the rectifier circuit, the rectifier circuit is connected to the load circuit, the input mode supported by the input mode switching circuit includes a three-phase input mode and a single-phase input mode, and the single-phase input mode includes an A-phase input mode, a B-phase input mode and a C-phase input mode; the control circuit can detect that the power supply circuit is in In single-phase power supply mode, the single-phase input mode of the input mode switching circuit is adjusted, and the detection result of the single-phase current source power supply phase is determined according to V_bus_rea and V_bus_ref in the adjusted single-phase input mode. Since V_bus_rea and V_bus_ref are not interfered by the filter circuit, there is no need to analyze the phase voltage interfered by the filter circuit, thereby eliminating the problem of interference of the capacitor in the input side filter circuit with the voltage sampling circuit due to phase voltage detection, which is conducive to quickly and accurately identifying the single-phase power supply phase for corresponding mode switching and electrical control, thereby improving the operating efficiency of the power supply circuit.

[0064] In a possible example, the interval between the sampling time node of the real value V_bus_rea of ​​V_bus and the time node when the input mode switching circuit is adjusted to the single-phase input mode is a preset time length ΔT;

[0065] ΔT is a duration greater than zero and less than half a power frequency cycle, and the power frequency cycle corresponds to the operating frequency of the three-phase current source.

[0066] Taking the working frequency of 50 Hz as an example, the power frequency period is 20 milliseconds, and ΔT can be, for example, 9 milliseconds, which is less than 10 milliseconds.

[0067] It can be seen that in this example, since ΔT corresponds to the interval time from the power supply circuit adjusting the input mode of the input mode switching circuit to detecting the bus voltage, the interval time is set to be less than half the power frequency cycle. This can effectively avoid the bus voltage being too low after discharge, which in turn causes the auxiliary power supply to lose power and the control chip to fail to work, which is beneficial to improving the stability of single-phase power supply phase detection.

[0068] In a possible example, adjusting the single-phase input mode of the input mode switching circuit, and determining the detection result of the single-phase current source power supply phase according to the sampled real values ​​V_bus_rea and V_bus_ref of V_bus in the adjusted single-phase input mode, includes: controlling the input mode of the input mode switching circuit to switch to the A-phase input mode, and sampling the first real value V_bus_rea1 of V_bus through the sampling circuit after a preset time length ΔT;

[0069] If it is detected that V_bus_rea1 is less than V_bus_ref, it is determined that the detection result is to supply power to the A-phase current source;

[0070] If it is detected that V_bus_rea1 is greater than or equal to V_bus_ref, the input mode of the input mode switching circuit is controlled to switch to the B-phase input mode, and a second real value V_bus_rea2 of V_bus is sampled through the sampling circuit after an interval of ΔT;

[0071] If it is detected that V_bus_rea2 is less than V_bus_ref, determining that the detection result is to power the B-phase current source;

[0072] If it is detected that V_bus_rea2 is greater than or equal to V_bus_ref, it is determined that the detection result is to power the C-phase current source.

[0073] It can be seen that in this example, since the output bus voltage V_bus on the rectifier circuit side of the power supply circuit is obtained by single-phase uncontrolled rectification, by adjusting the on and off of the branches corresponding to each phase in the input mode switching circuit, the bus voltage V_bus of the disconnected power supply phase can be accurately detected to be dropping, so that it can be determined that the corresponding single phase is supplying power. This mechanism can avoid the problem of being unable to accurately identify the power supply phase due to the inability to overcome the influence of the filter circuit on the sampling voltage in the technical route of using phase voltage to judge the single-phase power supply phase, thereby improving the feasibility and stability of single-phase power supply phase detection.

[0074] In one possible example, it is detected that the power supply mode of the three-phase current source is the single-phase power supply mode, and a reference bus voltage threshold V_bus_ref for detecting a drop state of the bus voltage V_bus of the rectifier circuit is determined, including: obtaining a third real value V_bus_rea3 of V_bus sampled by the sampling circuit at a marked time node; and setting V_bus_rea3 to V_bus_ref.

[0075] It can be seen that in this example, the power supply circuit can synchronously sample the true value of the bus voltage V_bus at the time node of the marking action, and set the true value to V_bus_ref. In this way, it can adapt to the need to prioritize the efficiency of the detection algorithm in the decision scenario between efficiency and accuracy of the detection algorithm (there is a small probability that the circuit state of the power supply circuit will cause the bus capacitor of the rectifier circuit to discharge too slowly due to the equivalent resistance on the load circuit side being too large, resulting in false detection).

[0076] In one possible example, Figure 8 The waveform analysis example of the bus voltage under different circuit states shown in the figure, in which Vbus is marked as V_bus, Vin is the voltage of the single-phase current source, the vertical axis is the voltage amplitude, the horizontal axis is the time base parameter ω×t, ω is the angular frequency, t is time, the solid line is the example waveform of V_bus, the line segment dashed line is the example waveform of Vin, and the triangle dashed line is the example waveform of the bus capacitor discharge after the power supply circuit 10 disconnects the single-phase current source from point B; the bus capacitor is Figure 6 For example, it may be the equivalent capacitance of the first capacitor C1 and the second capacitor C2 (ie, the sum of the capacitances of the two capacitors).

[0077] Among them, the voltage time domain waveform of V_bus includes point A, point B, point C, point D and point E, wherein point A refers to the first minimum value point of the waveform of V_bus in a single power frequency cycle under the single-phase input mode and the single-phase AC source power supply condition, point D refers to the second minimum value point of the waveform of V_bus in a single power frequency cycle under the single-phase input mode and the bus capacitor of the rectifier circuit. The first minimum value point and the second minimum value point have the same value, point B is the maximum value point of the waveform of V_bus in a single power frequency cycle under the single-phase input mode, the circuit state to which point C belongs is that the output current of the rectifier bridge arm corresponding to the single-phase input mode in the rectifier circuit is zero, that is, the load circuit is no longer powered by the single-phase AC source, but is powered by the electric energy released by the bus capacitor of the rectifier circuit, and the interval between the time node at point E and the time node at point B is a preset time length ΔT;

[0078] The detecting that the power supply mode of the three-phase current source is the single-phase power supply mode and determining a reference bus voltage threshold value V_bus_ref for detecting a drop state of the bus voltage V_bus of the rectifier circuit comprises:

[0079] The calculation formula to determine the voltage V_bus_B at point B is: V_bus_B= × V_in_rms (1);

[0080] Wherein, V_in_rms is the effective value of the input phase voltage of the single-phase current source in the single-phase input mode;

[0081] The calculation formula for determining V_bus during the period from point A to point C is: V_bus_AC= ×V_in_rms×sin(ω×t+α)(2);

[0082] Wherein, parameter ω is the angular frequency of the input phase voltage of the single-phase current source, parameter α is the initial phase angle of the single-phase current source and the time node corresponding to point A, and t is time;

[0083] The calculation formula for determining V_bus during the period between point C and point D is: (3);

[0084] Wherein, parameter θ is the continuous conduction angle of the single-phase current source and the time node corresponding to point C, parameter R is the equivalent resistance of the load circuit, and parameter C is the capacitance of the bus capacitor;

[0085] The output current of the rectifier bridge arm in the circuit state to which point C belongs is zero, which is expressed by the following formula: i_C+i_R=C×(dV_bus_C / dt)+(V_bus_C / R)=0(4);

[0086] Wherein, V_bus_C is the voltage of V_bus at point C, i_C is the current of the bus capacitor branch, and i_R is the current of the load circuit branch;

[0087] From formula (1)(2)(3)(4), we can get: ×V_in_rms×ω×cos(θ+α)+ ×V_in_rms×sin(θ+α) / R=0(5);

[0088] From formula (5), we can get: tan(θ+α)=-R×ω×C (6);

[0089] The calculation formula for determining the average voltage V_bus_ave of V_bus in a single power frequency cycle is: (7);

[0090] α and θ can be calculated by formula (6) and (7) respectively. The calculation formula for determining the voltage V_bus_A of V_bus at point A or point D is as follows: V_bus_A= ×V_in_rms×sinα(8);

[0091] V_bus_A is determined as V_bus_ref.

[0092] It can be seen that in this example, since point A can accurately indicate the low point of the voltage amplitude of the bus voltage of the power supply circuit under the current equivalent impedance state on the load circuit side, V_bus_ref is set to the low point of the voltage amplitude, and since point E combined with the waveform diagram can be seen to be the high point of the voltage amplitude of the real value that can be detected, the subsequent circuit adjustment makes the actual measured real value of point E must be smaller than V_bus_ref, thereby ensuring that false detection will not occur.

[0093] In a possible example, before adjusting the single-phase input mode of the input mode switching circuit and determining the detection result of the single-phase current source power supply phase according to the sampled real values ​​V_bus_rea and V_bus_ref of V_bus in the adjusted single-phase input mode, the method further includes:

[0094] Sample the real value V_bus_rea_E of V_bus at point E;

[0095] If it is detected that V_bus_rea_E is greater than V_bus_ref, the value of R of the load circuit is increased until V_bus_rea_E is again detected to be less than or equal to V_bus_ref in a new power frequency cycle;

[0096] If it is detected that V_bus_rea_E is less than or equal to V_bus_ref, the power supply circuit is marked as a detectable state.

[0097] It can be seen that in this example, by adjusting the power on the circuit load circuit side, the actual value measured at point E must be smaller than the updated V_bus_ref, thereby ensuring that no false detection occurs.

[0098] The embodiment of the present application provides a single-phase current source detection device for a power supply circuit, which is used to execute the steps executed by the electronic device in the above-mentioned mode control method based on power supply state detection. The single-phase current source detection device for a power supply circuit provided in the embodiment of the present application may include modules corresponding to the corresponding steps.

[0099] The embodiment of the present application can divide the functional modules of the single-phase current source detection device of the power supply circuit according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. The division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0100] In the case of dividing each functional module into corresponding functional modules, Fig. 9 A possible structural schematic diagram of a single-phase current source detection device for a power supply circuit involved in the above-mentioned embodiment is shown. A control circuit applied to a power supply circuit, the power supply circuit includes a three-phase current source, a filter circuit, a sampling circuit, an input mode switching circuit, a rectifier circuit, the control circuit and a load circuit, the three-phase current source is respectively connected to the filter circuit, the sampling circuit, the input mode switching circuit and the control circuit, the input mode switching circuit is connected to the rectifier circuit, the rectifier circuit is connected to the load circuit, the input mode switching circuit supports input modes including a three-phase input mode and a single-phase input mode, and the single-phase input mode includes an A-phase input mode, a B-phase input mode and a C-phase input mode; the device includes:

[0101] The sampling unit 901 is used to sample and determine through the sampling circuit that the phase voltage V_A of the phase A, the phase voltage V_B of the phase B, and the phase voltage V_C of the phase C of the three-phase current source are equal and are all greater than a preset phase voltage threshold, and mark the power supply mode of the three-phase current source as a single-phase power supply mode;

[0102] A detection unit 902 is used to detect that the power supply mode of the three-phase current source is the single-phase power supply mode, and determine a reference bus voltage threshold V_bus_ref for detecting a drop state of the bus voltage V_bus of the rectifier circuit;

[0103] The determination unit 903 is used to adjust the single-phase input mode of the input mode switching circuit, and determine the detection result of the single-phase current source power supply phase according to the real values ​​V_bus_rea and V_bus_ref of the sampled V_bus in the adjusted single-phase input mode, and the detection result includes A-phase current source power supply, B-phase current source power supply or C-phase current source power supply.

[0104] In a possible example, the interval between the sampling time node of the real value V_bus_rea of ​​V_bus and the time node when the input mode switching circuit is adjusted to the single-phase input mode is a preset time length ΔT;

[0105] ΔT is a duration greater than zero and less than half a power frequency cycle, and the power frequency cycle corresponds to the operating frequency of the three-phase current source.

[0106] In a possible example, in the aspect of adjusting the single-phase input mode of the input mode switching circuit and determining the detection result of the single-phase current source power supply phase according to the sampled real values ​​V_bus_rea and V_bus_ref of V_bus in the adjusted single-phase input mode, the determining unit 903 is specifically used to: control the input mode of the input mode switching circuit to switch to the A-phase input mode, and sample the first real value V_bus_rea1 of V_bus through the sampling circuit after a preset time length ΔT;

[0107] If it is detected that V_bus_rea1 is less than V_bus_ref, it is determined that the detection result is to supply power to the A-phase current source;

[0108] If it is detected that V_bus_rea1 is greater than or equal to V_bus_ref, the input mode of the input mode switching circuit is controlled to switch to the B-phase input mode, and a second real value V_bus_rea2 of V_bus is sampled through the sampling circuit after an interval of ΔT;

[0109] If it is detected that V_bus_rea2 is less than V_bus_ref, determining that the detection result is to power the B-phase current source;

[0110] If it is detected that V_bus_rea2 is greater than or equal to V_bus_ref, it is determined that the detection result is to power the C-phase current source.

[0111] In one possible example, when detecting that the power supply mode of the three-phase current source is the single-phase power supply mode, determining the reference bus voltage threshold V_bus_ref for detecting the drop state of the bus voltage V_bus of the rectifier circuit, the detection unit 902 is specifically used to: obtain the third real value V_bus_rea3 of V_bus sampled by the sampling circuit at the marked time node; and to set V_bus_rea3 to V_bus_ref.

[0112] In a possible example, the instantaneous voltage time domain waveform of V_bus includes point A, point B, point C, point D and point E, wherein point A refers to the first minimum point of the waveform of V_bus in a single power frequency cycle under the single-phase input mode and the single-phase AC source power supply condition, point D refers to the second minimum point of the waveform of V_bus in the single-phase input mode and the bus capacitor power supply condition of the rectifier circuit in the single power frequency cycle, the first minimum point and the second minimum point have the same value, point B is the maximum point of the waveform of V_bus in a single power frequency cycle under the single-phase input mode, point C is The circuit state is that the output current of the rectifier bridge arm corresponding to the single-phase input mode in the rectifier circuit is zero, that is, the load circuit is no longer powered by the single-phase AC source, but is powered by the electric energy released by the bus capacitor of the rectifier circuit, and the interval between the time node at point E and the time node at point B is a preset time length ΔT; in terms of determining a reference bus voltage threshold V_bus_ref for detecting a drop state of the bus voltage V_bus of the rectifier circuit when the power supply mode of the three-phase current source is detected to be the single-phase power supply mode, the detection unit 902 is specifically used to:

[0113] The calculation formula to determine the voltage V_bus_B at point B is: V_bus_B= × V_in_rms (1);

[0114] Wherein, V_in_rms is the effective value of the input phase voltage of the single-phase current source in the single-phase input mode;

[0115] The calculation formula for determining V_bus during the period from point A to point C is: V_bus_AC= ×V_in_rms×sin(ω×t+α)(2);

[0116] Wherein, parameter ω is the angular frequency of the input phase voltage of the single-phase current source, parameter α is the initial phase angle of the single-phase current source and the time node corresponding to point A, and t is the time parameter;

[0117] The calculation formula for determining V_bus during the period between point C and point D is: (3);

[0118] Wherein, parameter θ is the continuous conduction angle of the single-phase current source and the time node corresponding to point C, parameter R is the equivalent resistance of the load circuit, and parameter C is the capacitance of the bus capacitor;

[0119] In the circuit state to which point C belongs, the output current of the rectifier bridge arm is zero, which is expressed by the following formula:

[0120] i_C+i_R=C×(dV_bus_C / dt)+(V_bus_C / R)=0(4);

[0121] Wherein, V_bus_C is the voltage of V_bus at point C, i_C is the current of the bus capacitor branch, and i_R is the current of the load circuit branch;

[0122] From formula (1)(2)(3)(4), we can get: ×V_in_rms×ω×cos(θ+α)+ ×V_in_rms×sin(θ+α) / R=0(5);

[0123] From formula (5), we can get: tan(θ+α)=-R×ω×C (6);

[0124] The calculation formula for determining the average voltage V_bus_ave of V_bus in a single power frequency cycle is: (7);

[0125] α and θ can be calculated by formula (6) and (7) respectively. The calculation formula for determining the voltage V_bus_A of V_bus at point A or point D is as follows: V_bus_A= ×V_in_rms×sinα(8)

[0126] V_bus_A is determined as V_bus_ref.

[0127] In a possible example, the sampling unit 901 is also used to sample the real value V_bus_rea_E of V_bus at point E before the determination unit 903 adjusts the single-phase input mode of the input mode switching circuit and determines the detection result of the single-phase current source power supply phase according to the sampled real values ​​V_bus_rea and V_bus_ref of V_bus in the adjusted single-phase input mode; if it is detected that V_bus_rea_E is greater than V_bus_ref, the value of R of the load circuit is increased until V_bus_rea_E is re-detected to be less than or equal to V_bus_ref in a new power frequency cycle; if it is detected that V_bus_rea_E is less than or equal to V_bus_ref, the power supply circuit is marked as a detectable state.

[0128] In a possible example, the filtering circuit includes a first capacitor C1, a second capacitor C2, and a third capacitor C3, and the A phase is connected to the first end of the first capacitor C1 and the first end of the third capacitor C3, the B phase is connected to the second end of the first capacitor C1 and the first end of the second capacitor C2, and the C phase is connected to the second end of the second capacitor C2 and the second end of the third capacitor C3.

[0129] In a possible example, the sampling circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6, wherein:

[0130] A first end of the first resistor R1 is connected to the A phase and a first end of the first capacitor C1, and a second end of the first resistor R1 is connected to a first end of the second resistor R2.

[0131] A first end of the third resistor R3 is connected to the B phase, a second end of the first capacitor C1 and a first end of the second capacitor C2, and a second end of the third resistor R3 is connected to a first end of a fourth resistor R4.

[0132] A first end of the fifth resistor R5 is connected to the C phase, the second end of the second capacitor C2 and the second end of the third capacitor C3, and a second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6.

[0133] The second end of the second resistor R2 , the second end of the fourth resistor R4 , and the second end of the sixth resistor R6 are all connected to the neutral line N of the three-phase current source.

[0134] In a possible example, before marking the power supply mode of the three-phase current source as the single-phase power supply mode, the input mode of the input mode switching circuit is configured as the three-phase input mode; the power frequency of the three-phase current source is 50HZ;

[0135] The difference between the capacitive reactance of the first capacitor C1, the second capacitor C2, and the third capacitor C3 in the single-phase input mode and the equivalent resistance of the circuit branches to which the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 belong makes V_A, V_B, and V_C equal and all greater than the preset phase voltage threshold.

[0136] In a possible example, the input mode switching circuit includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, and a sixth switch K6; wherein,

[0137] The first port K31 of the third switch K3 is connected to the A phase, and the second port K32 of the third switch K3 is connected to the A phase rectifier bridge arm of the rectifier circuit;

[0138] The first port K11 of the first switch K1 is connected to the B phase, the second port K12 of the first switch K1 is connected to the first port K61 of the sixth switch K6, the second port K62 of the sixth switch K6 is connected to the N line, the third port K13 of the first switch K1 is connected to the first port K41 of the fourth switch K4, and the second port K42 of the fourth switch K4 is connected to the B phase rectifier bridge arm of the rectifier circuit;

[0139] The first port K21 of the second switch K2 is connected to the C phase, the second port K22 of the second switch K2 is connected to the first port K61 of the sixth switch K6, the third port K23 of the second switch K2 is connected to the first end of the fifth switch K5, and the second port K52 of the fifth switch K5 is connected to the C phase rectifier bridge arm of the rectifier circuit;

[0140] The three-phase input mode corresponds to that the first port K11 of the first switch K1, the third port K13 of the first switch K1, the first port K21 of the second switch K2, the third port K23 of the second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5 are all turned on, and the sixth switch K6 is turned off;

[0141] The AN phase power supply mode corresponds to the third switch K3, the fourth switch K4, the third port K13 of the first switch K1, the second port K12 of the first switch K1, the sixth switch K6, the first port K21 of the second switch K2, and the third port K23 of the second switch K2 being turned on, and the fifth switch K5 being turned off;

[0142] In the BN phase power supply mode, the first port K11 of the first switch K1, the third port K13 of the first switch K1, the fourth switch K4, the fifth switch K5, the third port K23 of the second switch K2, the second port K22 of the second switch K2, and the sixth switch K6 are turned on, and the third switch K3 is turned off;

[0143] The CN phase power supply mode corresponds to the first port K21 of the second switch K2, the third port K23 of the second switch K2, the fifth switch K5, the fourth switch K4, the third port K13 of the first switch K1, the second port K12 of the first switch K1, and the sixth switch K6 being turned on, and the third switch K3 being turned off.

[0144] In the case of using an integrated unit, the structural schematic diagram of another single-phase current source detection device for a power supply circuit provided in an embodiment of the present application is as follows: Fig.10 As shown. Fig.10In the present invention, the single-phase current source detection device for the power supply circuit includes: a processing module 1000 and a communication module 1001. The processing module 1000 is used to control and manage the actions of the single-phase current source detection device for the power supply circuit, for example, the steps performed by the sampling unit 901 and the detection unit 902, and / or other processes for performing the technology described herein. The communication module 1001 is used to support the interaction between the single-phase current source detection device for the power supply circuit and other devices. Fig.10 As shown, the single-phase current source detection device for a power supply circuit may further include a storage module 1002, and the storage module 1002 is used to store program codes and data of the single-phase current source detection device for a power supply circuit.

[0145] Among them, the processing module 1000 can be a processor or a controller, for example, a central processing unit (CPU), a general processor, a digital signal processor (DSP), an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements a computing function, for example, a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The communication module 1001 can be a transceiver, an RF circuit or a communication interface, and the like. The storage module 1002 can be a memory.

[0146] Among them, all relevant contents of each scenario involved in the above method embodiment can be referred to the functional description of the corresponding functional module, and will not be repeated here. The single-phase current source detection device of the above power supply circuit can execute the above Figure 7 The steps performed by the electronic device in the mode control method based on power supply status detection are shown.

[0147] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented using software, the above embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that contains one or more available media sets. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium. The semiconductor medium may be a solid-state hard disk.

[0148] An embodiment of the present application also provides a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, wherein the computer program enables a computer to execute part or all of the steps of any method described in the above method embodiments, and the above computer includes an electronic device.

[0149] The embodiment of the present application also provides a computer program product, the computer program product includes a non-transitory computer-readable storage medium storing a computer program, the computer program is operable to cause a computer to execute some or all of the steps of any method described in the method embodiment. The computer program product may be a software installation package, and the computer includes an electronic device.

[0150] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0151] In the several embodiments provided in the present application, it should be understood that the disclosed methods, devices and systems can be implemented in other ways. For example, the device embodiments described above are merely schematic; for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation; 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0152] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0153] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0154] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform some steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store program codes.

[0155] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions without departing from the spirit and scope of the present invention, and can make various changes and modifications, including the combination of the above-mentioned different functions and implementation steps, including software and hardware implementation methods, all of which are within the scope of protection of the present invention.

Claims

1. A single-phase current source detection method for a power supply circuit, characterized in that: A control circuit applied to a power supply circuit, the power supply circuit comprising a three-phase current source, a filter circuit, a sampling circuit, an input mode switching circuit, a rectifier circuit, the control circuit and a load circuit, the three-phase current source being respectively connected to the filter circuit, the sampling circuit, the input mode switching circuit and the control circuit, the input mode switching circuit being connected to the rectifier circuit, the rectifier circuit being connected to the load circuit, the input modes supported by the input mode switching circuit comprising a three-phase input mode and a single-phase input mode, the single-phase input mode comprising an A-phase input mode, a B-phase input mode and a C-phase input mode; the method comprising: The sampling circuit samples and determines that the phase voltage V_A of the phase A, the phase voltage V_B of the phase B, and the phase voltage V_C of the phase C of the three-phase current source are equal and are all greater than the preset phase voltage threshold, and marks the power supply mode of the three-phase current source as a single-phase power supply mode; It is detected that the power supply mode of the three-phase current source is the single-phase power supply mode, and a reference bus voltage threshold value V_bus_ref for detecting a drop state of the bus voltage V_bus of the rectifier circuit is determined; By adjusting the single-phase input mode of the input mode switching circuit, and determining the detection result of the single-phase current source power supply phase according to the sampled real values ​​V_bus_rea and V_bus_ref of V_bus in the adjusted single-phase input mode, the detection result includes A-phase current source power supply, B-phase current source power supply or C-phase current source power supply.

2. The method according to claim 1, characterized in that The interval between the sampling time node of the real value V_bus_rea of ​​V_bus and the time node when the input mode switching circuit is adjusted to the single-phase input mode is a preset time length ΔT; ΔT is a duration greater than zero and less than half a power frequency cycle, and the power frequency cycle corresponds to the operating frequency of the three-phase current source.

3. The method according to claim 1 or 2, characterized in that: The method of adjusting the single-phase input mode of the input mode switching circuit and determining the detection result of the single-phase current source power supply phase according to the sampled real values ​​V_bus_rea and V_bus_ref of V_bus in the adjusted single-phase input mode includes: Control the input mode of the input mode switching circuit to switch to the A-phase input mode, and sample the first real value V_bus_rea1 of V_bus through the sampling circuit after a preset time length ΔT; If it is detected that V_bus_rea1 is less than V_bus_ref, it is determined that the detection result is to supply power to the A-phase current source; If it is detected that V_bus_rea1 is greater than or equal to V_bus_ref, the input mode of the input mode switching circuit is controlled to switch to the B-phase input mode, and a second real value V_bus_rea2 of V_bus is sampled through the sampling circuit after an interval of ΔT; If it is detected that V_bus_rea2 is less than V_bus_ref, determining that the detection result is to power the B-phase current source; If it is detected that V_bus_rea2 is greater than or equal to V_bus_ref, it is determined that the detection result is to power the C-phase current source.

4. The method according to claim 1 or 2, characterized in that: The detecting that the power supply mode of the three-phase current source is the single-phase power supply mode and determining a reference bus voltage threshold value V_bus_ref for detecting a drop state of the bus voltage V_bus of the rectifier circuit comprises: Acquire a third real value V_bus_rea3 of V_bus sampled by the sampling circuit at the marked time node; Set V_bus_rea3 to V_bus_ref.

5. The method according to claim 1 or 2, characterized in that: The instantaneous voltage time domain waveform of V_bus includes point A, point B, point C, point D and point E, wherein point A refers to the first minimum value point of the waveform of V_bus in a single power frequency cycle under the single-phase input mode and the single-phase AC source power supply condition, point D refers to the second minimum value point of the waveform of V_bus in a single power frequency cycle under the single-phase input mode and the bus capacitor of the rectifier circuit power supply condition, the first minimum value point and the second minimum value point have the same value, point B is the maximum value point of the waveform of V_bus in a single power frequency cycle under the single-phase input mode, the circuit state to which point C belongs is that the output current of the rectifier bridge arm corresponding to the single-phase input mode in the rectifier circuit is zero, that is, the load circuit is no longer powered by the single-phase AC source, but is powered by the electric energy released by the bus capacitor of the rectifier circuit, and the interval between the time node at point E and the time node at point B is a preset time length ΔT; The detecting that the power supply mode of the three-phase current source is the single-phase power supply mode and determining a reference bus voltage threshold value V_bus_ref for detecting a drop state of the bus voltage V_bus of the rectifier circuit comprises: The calculation formula to determine the voltage V_bus_B at point B is: V_bus_B= × V_in_rms (1); Wherein, V_in_rms is the effective value of the input phase voltage of the single-phase current source in the single-phase input mode; The calculation formula for determining V_bus during the period from point A to point C is: V_bus_AC= ×V_in_rms×sin(ω×t+α)(2); Wherein, parameter ω is the angular frequency of the input phase voltage of the single-phase current source, parameter α is the initial phase angle of the single-phase current source and the time node corresponding to point A, and t is time; The calculation formula for determining V_bus during the period between point C and point D is: (3); Wherein, parameter θ is the continuous conduction angle of the single-phase current source and the time node corresponding to point C, parameter R is the equivalent resistance of the load circuit, and parameter C is the capacitance of the bus capacitor; The output current of the rectifier bridge arm in the circuit state to which point C belongs is zero, which is expressed by the following formula: i_C+i_R=C×(dV_bus_C / dt)+(V_bus_C / R)=0(4); Wherein, V_bus_C is the voltage of V_bus at point C, i_C is the current of the bus capacitor branch, and i_R is the current of the load circuit branch; From formula (1)(2)(3)(4), we can get: ×V_in_rms×ω×cos(θ+α)+ ×V_in_rms×sin(θ+α) / R=0(5); From formula (5), we can get: tan(θ+α)=-R×ω×C (6); The calculation formula for determining the average voltage V_bus_ave of V_bus in a single power frequency cycle is: (7); α and θ can be calculated by formula (6) and (7) respectively. The calculation formula for determining the voltage V_bus_A of V_bus at point A or point D is as follows: V_bus_A= ×V_in_rms×sinα(8); V_bus_A is determined as V_bus_ref.

6. The method according to claim 5, characterized in that Before adjusting the single-phase input mode of the input mode switching circuit and determining the detection result of the single-phase current source power supply phase according to the sampled real values ​​V_bus_rea and V_bus_ref of V_bus in the adjusted single-phase input mode, the method further includes: Sample the real value V_bus_rea_E of V_bus at point E; If it is detected that V_bus_rea_E is greater than V_bus_ref, the value of R of the load circuit is increased until V_bus_rea_E is again detected to be less than or equal to V_bus_ref in a new power frequency cycle; If it is detected that V_bus_rea_E is less than or equal to V_bus_ref, the power supply circuit is marked as a detectable state.

7. The method according to claim 1 or 2, characterized in that: The filter circuit includes a first capacitor C1, a second capacitor C2, and a third capacitor C3, and the A phase is connected to a first end of the first capacitor C1 and a first end of the third capacitor C3, the B phase is connected to a second end of the first capacitor C1 and a first end of the second capacitor C2, and the C phase is connected to a second end of the second capacitor C2 and a second end of the third capacitor C3.

8. The method according to claim 7, characterized in that The sampling circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6, wherein: A first end of the first resistor R1 is connected to the A phase and a first end of the first capacitor C1, and a second end of the first resistor R1 is connected to a first end of the second resistor R2. A first end of the third resistor R3 is connected to the B phase, a second end of the first capacitor C1 and a first end of the second capacitor C2, and a second end of the third resistor R3 is connected to a first end of a fourth resistor R4. A first end of the fifth resistor R5 is connected to the C phase, the second end of the second capacitor C2 and the second end of the third capacitor C3, and a second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6. The second end of the second resistor R2 , the second end of the fourth resistor R4 , and the second end of the sixth resistor R6 are all connected to the neutral line N of the three-phase current source.

9. The method according to claim 8, characterized in that Before marking the power supply mode of the three-phase current source as the single-phase power supply mode, the input mode of the input mode switching circuit is configured as the three-phase input mode; the power frequency of the three-phase current source is 50HZ; The difference between the capacitive reactance of the first capacitor C1, the second capacitor C2, and the third capacitor C3 in the single-phase input mode and the equivalent resistance of the circuit branches to which the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 belong makes V_A, V_B, and V_C equal and all greater than the preset phase voltage threshold.

10. The method according to claim 9, characterized in that The input mode switching circuit includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, and a sixth switch K6; wherein, The first port K31 of the third switch K3 is connected to the A phase, and the second port K32 of the third switch K3 is connected to the A phase rectifier bridge arm of the rectifier circuit; The first port K11 of the first switch K1 is connected to the B phase, the second port K12 of the first switch K1 is connected to the first port K61 of the sixth switch K6, the second port K62 of the sixth switch K6 is connected to the N line, the third port K13 of the first switch K1 is connected to the first port K41 of the fourth switch K4, and the second port K42 of the fourth switch K4 is connected to the B phase rectifier bridge arm of the rectifier circuit; The first port K21 of the second switch K2 is connected to the C phase, the second port K22 of the second switch K2 is connected to the first port K61 of the sixth switch K6, the third port K23 of the second switch K2 is connected to the first end of the fifth switch K5, and the second port K52 of the fifth switch K5 is connected to the C phase rectifier bridge arm of the rectifier circuit; The three-phase input mode corresponds to that the first port K11 of the first switch K1, the third port K13 of the first switch K1, the first port K21 of the second switch K2, the third port K23 of the second switch K2, the third switch K3, the fourth switch K4, and the fifth switch K5 are all turned on, and the sixth switch K6 is turned off; The AN phase power supply mode corresponds to the third switch K3, the fourth switch K4, the third port K13 of the first switch K1, the second port K12 of the first switch K1, the sixth switch K6, the first port K21 of the second switch K2, and the third port K23 of the second switch K2 being turned on, and the fifth switch K5 being turned off; In the BN phase power supply mode, the first port K11 of the first switch K1, the third port K13 of the first switch K1, the fourth switch K4, the fifth switch K5, the third port K23 of the second switch K2, the second port K22 of the second switch K2, and the sixth switch K6 are turned on, and the third switch K3 is turned off; The CN phase power supply mode corresponds to the first port K21 of the second switch K2, the third port K23 of the second switch K2, the fifth switch K5, the fourth switch K4, the third port K13 of the first switch K1, the second port K12 of the first switch K1, and the sixth switch K6 being turned on, and the third switch K3 being turned off.

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