Mode control method based on power supply status detection

Abstract

The present application provides a mode control method based on power supply state detection, which is applied to the control circuit of a three-phase power supply circuit. According to V_A, V_B, V_C, V_AB, V_BC, V_CA, V_min of the three-phase current source and the power supply mode of the input mode switching circuit, the power supply state of the three-phase current source is determined, and the power supply mode of the input mode switching circuit is adjusted according to the power supply state to overcome the influence of the power supply state. The three-phase power supply circuit can automatically identify the actual power supply state on the power supply side, and adjust the power supply mode of the input mode switching circuit according to the power supply state to overcome the influence of the power supply state, thereby improving the flexibility and adaptability of the mode control of the three-phase power supply circuit.

Description

Technical Field

[0001] The present application relates to the technical field of circuits related to AC power supply systems, and in particular to a mode control method based on power supply status detection. Background Art

[0002] At present, in weak power grid systems, the grid voltage may experience abnormal power supply conditions such as three-phase imbalance, phase loss, and short circuit. When a conventional rectifier circuit system detects an abnormal power supply condition on the grid side, the circuit system can only disconnect the output and shut down. It can only be allowed to start up again after the operation and maintenance personnel have eliminated the obstacles. Summary of the invention

[0003] The embodiment of the present application provides a mode control method based on power supply status detection, which can intelligently control the input mode of a three-phase power supply circuit with an adjustable input mode according to the current power supply status of the current source side, so that the three-phase power supply circuit can maintain uninterrupted operation under different current source power supply states, thereby ensuring the efficient use of the grid voltage and improving the stability and power efficiency of the three-phase power supply circuit.

[0004] In a first aspect, an embodiment of the present application provides a mode control method based on power supply state detection, which is applied to a control circuit of a three-phase power supply circuit, wherein the three-phase power supply circuit includes a three-phase current source, a voltage sampling circuit, the control circuit, an input mode switching circuit, a rectifier circuit and a load, wherein the three-phase current source is electrically connected to the voltage sampling circuit and the input mode switching circuit, the control circuit is connected to the voltage sampling circuit and the input mode switching circuit, the input mode switching circuit is connected to the rectifier circuit, the rectifier circuit is connected to the load, and the input mode switching circuit supports any one of a three-phase input mode, a two-phase input mode and a single-phase input mode; the method includes:

[0005] Acquire the first phase voltage V_A, the second phase voltage V_B, the third phase voltage V_C, the first line voltage V_AB, the second line voltage V_BC and the third line voltage V_CA of the three-phase current source through the voltage sampling circuit;

[0006] According to V_A, V_B, V_C, V_AB, V_BC, V_CA, a preset voltage threshold V_min, and the power supply mode of the input mode switching circuit, determine the power supply state of the three-phase current source, wherein the power supply state includes any one of no fault, single-phase loss, two-phase loss, three-phase loss, two-phase short circuit, three-phase short circuit, and three-phase imbalance;

[0007] The power supply mode of the input mode switching circuit is adjusted according to the power supply state to overcome the influence of the power supply state.

[0008] In a second aspect, an embodiment of the present application provides a three-phase power supply circuit, the three-phase power supply circuit comprising a three-phase current source, a voltage sampling circuit, the control circuit, an input mode switching circuit, a rectifier circuit and a load, the three-phase current source is electrically connected to the voltage sampling circuit and the input mode switching circuit, the control circuit is connected to the voltage sampling circuit and the input mode switching circuit, the input mode switching circuit is connected to the rectifier circuit, the rectifier circuit is connected to the load, and the input mode switching circuit supports any one of a three-phase input mode, a two-phase input mode and a single-phase input mode;

[0009] A control circuit, used for acquiring the first phase voltage V_A, the second phase voltage V_B, the third phase voltage V_C, and the first line voltage V_AB, the second line voltage V_BC and the third line voltage V_CA of the three-phase current source through the voltage sampling circuit;

[0010] and used to determine the power supply state of the three-phase current source according to V_A, V_B, V_C, V_AB, V_BC, V_CA, a preset voltage threshold V_min, and the power supply mode of the input mode switching circuit, wherein the power supply state includes any one of no fault, single-phase loss, two-phase loss, three-phase loss, two-phase short circuit, three-phase short circuit, and three-phase imbalance;

[0011] And used for adjusting the power supply mode of the input mode switching circuit according to the power supply state to overcome the influence of the power supply state.

[0012] In a third aspect, an embodiment of the present application provides a mode control device based on power supply state detection, which is applied to a control circuit of a three-phase power supply circuit, wherein the three-phase power supply circuit includes a three-phase current source, a voltage sampling circuit, the control circuit, an input mode switching circuit, a rectifier circuit and a load, wherein the three-phase current source is electrically connected to the voltage sampling circuit and the input mode switching circuit, the control circuit is connected to the voltage sampling circuit and the input mode switching circuit, the input mode switching circuit is connected to the rectifier circuit, the rectifier circuit is connected to the load, and the input mode switching circuit supports any one of a three-phase input mode, a two-phase input mode and a single-phase input mode; the device includes:

[0013] A determination unit, configured to obtain a first phase voltage V_A, a second phase voltage V_B, a third phase voltage V_C, and a first line voltage V_AB, a second line voltage V_BC, and a third line voltage V_CA of the three-phase current source through the voltage sampling circuit;

[0014] The determining unit is further used to determine the power supply state of the three-phase current source according to V_A, V_B, V_C, V_AB, V_BC, V_CA, a preset voltage threshold V_min, and the power supply mode of the input mode switching circuit, wherein the power supply state includes any one of no fault, single-phase loss, two-phase loss, three-phase loss, two-phase short circuit, three-phase short circuit, and three-phase imbalance;

[0015] An adjustment unit is used to adjust the power supply mode of the input mode switching circuit according to the power supply state to overcome the influence of the power supply state.

[0016] 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.

[0017] 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.

[0018] It can be seen that in the embodiment of the present application, the control circuit of the three-phase power supply circuit can determine the current power supply state of the current source side according to V_A, V_B, V_C, V_AB, V_BC, V_CA, the preset voltage threshold V_min, and the power supply mode of the input mode switching circuit, and then according to the current power supply state of the current source side, on the three-phase power supply circuit with an adjustable input mode function, intelligently control its input mode, so that the three-phase power supply circuit can maintain uninterrupted operation under different current source power supply states, thereby ensuring the efficient use of the grid voltage and improving the stability and power efficiency of the three-phase power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a circuit diagram of a three-phase power supply circuit 10 provided in the present application;

[0020] Figure 2 is a circuit diagram of a voltage sampling circuit 110 provided in the present application;

[0021] Figure 3 is a circuit diagram of an input mode switching circuit 130 provided by the present application;

[0022] Figure 4 The present application provides a mode control method based on power supply state detection for the control circuit 120 of the above-mentioned three-phase power supply circuit 10;

[0023] Figure 5 This is a circuit state schematic diagram of a phase A failure provided by the present application;

[0024] Figure 6 This is a circuit state diagram of a phase B failure provided by the present application;

[0025] Figure 7 This is a circuit state diagram of a phase C missing phase provided by the present application;

[0026] Figure 8 This is a circuit state schematic diagram of an AB phase short circuit provided by the present application;

[0027] Fig. 9 This is a circuit state schematic diagram of a BC phase short circuit provided by the present application;

[0028] Fig.10 This is a schematic diagram of a circuit state in which the CA phase is short-circuited provided by the present application;

[0029] Fig.11 It is a schematic diagram of a fault-free circuit state provided by the present application;

[0030] Fig.12 This is a schematic diagram of a three-phase missing phase circuit state provided by the present application;

[0031] Fig.13 It is a schematic diagram of a three-phase short-circuit circuit state provided by the present application;

[0032] Fig.14 This is a circuit state schematic diagram provided by the present application in which BN is short-circuited and AB phases are missing;

[0033] Fig.15 This is a circuit state schematic diagram provided by the present application in which BN is short-circuited and BC phase is missing;

[0034] Fig.16 It is a structural schematic diagram of a mode control device based on power supply status detection provided by the present application;

[0035] Fig.17 It is a structural schematic diagram of another mode control device based on power supply status detection provided by the present application. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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".

[0039] 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.

[0040] like Figure 1 As shown, an embodiment of the present application provides a three-phase power supply circuit 10, which includes a three-phase current source 100, a voltage sampling circuit 110, a control circuit 120, an input mode switching circuit 130, a rectifier circuit 140 and a load 150. The three-phase current source 100 is electrically connected to the voltage sampling circuit 110 and the input mode switching circuit 130, the control circuit 120 is connected to the voltage sampling circuit 110 and the input mode switching circuit 130, the input mode switching circuit 130 is connected to the rectifier circuit 140, and the rectifier circuit 140 is connected to the load 150.

[0041] The input mode switching circuit 130 supports any one of a three-phase input mode, a two-phase input mode and a single-phase input mode;

[0042] Among them, the two-phase input mode includes AB phase input mode, AC phase input mode, BC phase input mode, and the single-phase input mode includes AN single-phase input mode, BN single-phase input mode and CN single-phase input mode.

[0043] In addition, the input mode switching circuit 130 also includes an off-grid mode, which can specifically disconnect the electrical connection between phase A, phase B, phase C and the rectifier circuit for restarting the three-phase current source side, etc.

[0044] like Figure 2 As shown, the present application embodiment provides a circuit diagram of a voltage sampling circuit 110, wherein V AN is the current source of phase A, V BN is the current source of phase B, V CN is the current source of phase C, A, B, and C refer to the potential poles of phase A, phase B, and phase C respectively, N is the position of line N, and the voltage sampling circuit 110 specifically includes a first capacitor C1, a second capacitor C2, and a third capacitor C3 for suppressing electromagnetic interference, and 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, V SA is the first voltage sampling point between the first resistor R1 and the second resistor R2, V SB is the second voltage sampling point between the third resistor R3 and the fourth resistor R4, V SC It is the third voltage sampling point between the fifth resistor R5 and the sixth resistor R6. The sampling value of the first voltage sampling point is used to calculate the phase voltage of phase A, the sampling value of the second voltage sampling point is used to calculate the phase voltage of phase B, and the sampling value of the third voltage sampling point is used to calculate the phase voltage of phase C.

[0045] Among them, the first end of the first capacitor C1, the first end of the third capacitor C3, and the first end of the first resistor R1 are all connected to the A phase, and the second end of the first resistor R1 is connected to the first end of the second resistor R2; the second end of the first capacitor C1, the first end of the second capacitor C2, and the first end of the third resistor R3 are all connected to the B phase, and the second end of the third resistor R3 is connected to the first end of the fourth resistor R4; the first end of the second capacitor C2, the second end of the third capacitor C3, and the first end of the fifth resistor R5 are all connected to the C phase, and the second end of the fifth resistor R5 is connected to the 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 N line.

[0046] It can be seen that in this example, the first capacitor C1, the second capacitor C2, and the third capacitor C3 are connected between two phases of phase A, phase B, and phase C, which can effectively suppress electromagnetic interference of each phase and improve the accuracy of sampling data.

[0047] like Figure 3As shown, an embodiment of the present application provides a circuit schematic diagram of an input mode switching circuit 130, 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 the first port K11 of the first switch K1 is connected to the B phase, the first port K21 of the second switch K2 is connected to the C phase, the first port K31 of the third switch K3 is connected to the A phase, the second port K12 of the first switch K1 and the second port K22 of the second switch K2 are both 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 first port K41 of the fourth switch K4 is connected to the third port K13 of the first switch K1; the first port K51 of the fifth switch K5 is connected to the third port K23 of the second switch K2.

[0048] In addition, the second end K32 of the third switch K3, the second end K42 of the fourth switch K4, and the second end K52 of the fifth switch K5 are all connected to the respective ports of the rectifier circuit. For example, when the rectifier circuit is a three-phase Vienna rectifier circuit, the second port K32 of the third switch K3 can be connected to the A-phase rectifier bridge arm of the three-phase Vienna rectifier circuit, the second port K42 of the fourth switch K4 can be connected to the B-phase rectifier bridge arm of the three-phase Vienna rectifier circuit, and the second port K52 of the fifth switch K5 can be connected to the C-phase rectifier bridge arm of the three-phase Vienna rectifier circuit.

[0049] When the first port K11 of the first switch K1 and the second port K12 of the first switch K1 are controlled to be turned on and the sixth switch K6 is closed, the B phase is short-circuited with the N line.

[0050] It can be seen that in this example, the input mode switching circuit 130 can realize flexible control of multiple input modes through the settings of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6, thereby improving the flexibility and adaptability of mode control.

[0051] like Figure 4 As shown, the embodiment of the present application provides a mode control method based on power supply state detection for the control circuit 120 applied to the above-mentioned three-phase power supply circuit 10, comprising the following steps:

[0052] S400, acquiring the first phase voltage V_A, the second phase voltage V_B, the third phase voltage V_C, and the first line voltage V_AB, the second line voltage V_BC and the third line voltage V_CA of the three-phase current source through the voltage sampling circuit;

[0053] Among them, V_A is the effective value of the phase voltage of phase A of the three-phase current source, V_B is the effective value of the phase voltage of phase B of the three-phase current source, V_C is the effective value of the phase voltage of phase C of the three-phase current source, V_AB is the effective value of the line voltage between phase A and phase B, V_BC is the effective value of the line voltage between phase B and phase C, and V_CA is the effective value of the line voltage between phase C and phase A.

[0054] S420, determining the power supply state of the three-phase current source according to V_A, V_B, V_C, V_AB, V_BC, V_CA, a preset voltage threshold V_min, and a power supply mode of the input mode switching circuit;

[0055] The power supply status includes any one of no fault, single-phase loss, two-phase loss, three-phase loss, two-phase short circuit, three-phase short circuit, and three-phase imbalance;

[0056] S440: Adjust the power supply mode of the input mode switching circuit according to the power supply state to overcome the influence of the power supply state.

[0057] It can be seen that in the embodiment of the present application, the control circuit of the three-phase power supply circuit can determine the current power supply state of the current source side according to V_AB, V_BC, V_CA, V_min_P, V_max_L, the preset voltage threshold V_min, and the power supply mode of the input mode switching circuit, and then according to the current power supply state of the current source side, on the three-phase power supply circuit with an adjustable input mode function, intelligently control its input mode, so that the three-phase power supply circuit can maintain uninterrupted operation under different current source power supply states, thereby ensuring the efficient use of the grid voltage and improving the stability and power efficiency of the three-phase power supply circuit.

[0058] In a possible example, determining the power supply state of the three-phase current source according to V_A, V_B, V_C, V_AB, V_BC, V_CA, a preset voltage threshold V_min, and a power supply mode of the input mode switching circuit includes:

[0059] Controlling the power supply mode of the input mode switching circuit to the three-phase input mode so that the A phase, the B phase and the C phase of the three-phase current source are all in a non-short-circuited state with the neutral line N of the three-phase current source;

[0060] Detecting whether the three-phase current source is in a first power supply state according to V_AB, V_BC, V_CA, and V_min, wherein the first power supply state includes any one of the single-phase loss, the two-phase short circuit, and the three-phase imbalance;

[0061] If it is detected that the three-phase current source is in the first type of power supply state, determining that the detected first type of power supply state is the power supply state of the three-phase current source;

[0062] If it is detected that the three-phase current source is not in the first power supply state, then detect whether the three-phase current source is in the second power supply state according to V_AB, V_BC, V_CA, V_min, V_A, V_B, and V_C, and the second power supply state includes any one of the no-fault, the three-phase missing, and the three-phase short circuit;

[0063] If it is detected that the three-phase current source is in the second type of power supply state, determining that the detected second type of power supply state is the power supply state of the three-phase current source;

[0064] If it is detected that the three-phase current source is not in the second power supply state, the power supply mode of the input mode switching circuit is controlled to switch to the AC phase input mode so that the B phase is short-circuited with the N line; and, according to V_AB, V_BC, V_CA, V_min, whether the three-phase current source is in the third power supply state, the third power supply state includes AB phase loss or BC phase loss;

[0065] If it is detected that the three-phase current source is in the third type of power supply state, determining that the detected third type of power supply state is the power supply state of the three-phase current source;

[0066] If it is detected that the three-phase current source is not in the third type of power supply state, it is determined that the AC phase is missing as the power supply state of the three-phase current source.

[0067] Among them, when phase A, phase B and phase C are all in a non-short-circuited state with the N line, when phase AB is missing, only phase C current source supplies power, when phase BC is missing, only phase A current source supplies power, and when phase AC is missing, only phase B current source supplies power. In this circuit state of single-phase current source power supply, since the capacitance of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are relatively large, the branch circuits to which they belong are approximately wires, that is, the potentials are the same, so the phase voltages are equal and the line voltages are zero, and it is impossible to accurately detect which two phases are missing. Therefore, it is necessary to adjust the power supply mode of the input mode switching circuit 130, specifically adjust it to the AC phase power supply mode and make BN short-circuited, so that the circuit states of different two-phase power supplies are different. According to this difference, the accurate judgment of the two-phase missing combination type can be achieved.

[0068] It can be seen that in this example, the circuit system can fully consider the detectability of various different power supply states of the three-phase current source in different input power supply modes of the input mode switching circuit 130, thereby avoiding the situation where the power supply state cannot be accurately identified and improving the accuracy of detecting the power supply state.

[0069] In a possible example, the single-phase open-phase includes the open-phase of phase A, the open-phase of phase B, or the open-phase of phase C;

[0070] As Figure 5 shown, an embodiment of the present application provides a schematic diagram of the circuit state of the open-phase of phase A. The meanings of the respective identifiers in this figure are the same as those of the same identifiers in Figure 2 and will not be elaborated here.

[0071] In this circuit state, if |V_AB + V_CA - V_BC| < V_min, and V_min_L > V_min, where V_min_L is the minimum value among V_AB, V_CA, and V_BC, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is the open-phase of phase A; among them, in the open-phase state of phase A, the current sources of phase B and phase C supply power normally. Due to the potential difference between phase B and phase C, the second capacitor C2 has a charging and discharging process, which in turn causes the first capacitor C1 and the third capacitor C3 to be charged. And in the balanced state, the electric energy stored in the second capacitor C2 is equal to the sum of the electric energy stored in the first capacitor C1 and the third capacitor C3, that is, V_BC + V_CA = V_AB, and V_AB is the potential difference between the two electrodes of the first capacitor C1, V_CA is the potential difference between the two electrodes of the third capacitor C3, V_BC is the potential difference between the two electrodes of the second capacitor C2, and the potential differences are all greater than V_min.

[0072] As Figure 6 shown, an embodiment of the present application provides a schematic diagram of the circuit state of the open-phase of phase B. The meanings of the respective identifiers in this figure are the same as those of the same identifiers in Figure 2 and will not be elaborated here.

[0073] In this circuit state, if |V_AB + V_BC - V_CA| < V_min, and V_min_L > V_min, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is the open-phase of phase B; among them, in the open-phase state of phase B, the current sources of phase A and phase C supply power normally. Due to the potential difference between phase A and phase C, the third capacitor C3 branch and the branch where the first capacitor C1 is in series with the second capacitor C2 both have a process of charging to balance, which in turn causes the electric energy stored in the third capacitor C3 to be equal to the sum of the electric energy stored in the first capacitor C1 and the second capacitor C2, that is, V_BC + V_AB = V_CA, and V_AB is the potential difference between the two electrodes of the first capacitor C1, V_CA is the potential difference between the two electrodes of the third capacitor C3, V_BC is the potential difference between the two electrodes of the second capacitor C2, and the potential differences are all greater than V_min.

[0074] As Figure 7 shown, an embodiment of the present application provides a schematic diagram of the circuit state of the open-phase of phase C. The meanings of the respective identifiers in this figure are the same as those of the same identifiers in Figure 2The meanings of the same identifiers are the same as those above and will not be elaborated here.

[0075] In this circuit state, if |V_BC + V_CA - V_AB| < V_min and V_min_L > V_min, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is a C-phase open phase. In the C-phase open phase state, the A-phase and B-phase current sources supply power normally. Due to the potential difference between the A-phase and B-phase, there is a process in which the first capacitor C1 is charged and then discharges to the second capacitor C2 and the third capacitor C3 until balance, so that the electric energy stored in the first capacitor C1 is equal to the sum of the electric energies stored in the second capacitor C2 and the third capacitor C3, that is, V_BC + V_CA = V_AB, and V_AB is the potential difference between the two electrodes of the first capacitor C1, V_CA is the potential difference between the two electrodes of the third capacitor C3, V_BC is the potential difference between the two electrodes of the second capacitor C2, and the potential differences are all greater than V_min.

[0076] It can be seen that in this example, for the circuit state of single-phase open phase in a three-phase power supply circuit, the mode switching control circuit can accurately determine any one of the circuit states of A-phase open phase, B-phase open phase, and C-phase open phase through the correlation relationship of the three line voltages and the magnitude relationship between each line voltage and the voltage threshold in the state where the three-phase power supply is not short-circuited with the N line.

[0077] In a possible example, the two-phase short circuit includes an AB-phase short circuit, a BC-phase short circuit, and a CA-phase short circuit;

[0078] As Figure 8 shown, the embodiment of the present application provides a schematic diagram of the circuit state of an AB-phase short circuit. The meanings of the identifiers in this figure are the same as those of the same identifiers in Figure 2 and will not be elaborated here.

[0079] In this circuit state, if |V_AB + V_CA - V_BC| < V_min and V_AB < V_min, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is an AB-phase short circuit; in the AB-phase short circuit state, the potentials of the A-phase and C-phase are equal, that is, V_BC = V_CA, and the first capacitor C1 is empty, that is, V_AB = 0.

[0080] As Fig. 9 shown, the embodiment of the present application provides a schematic diagram of the circuit state of a BC-phase short circuit. The meanings of the identifiers in this figure are the same as those of the same identifiers in Figure 2 and will not be elaborated here.

[0081] In this circuit state, if |V_AB + V_BC - V_CA| < V_min and V_BC < V_min, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is a short circuit between phases B and C; where in the short circuit state between phases B and C, the potentials of phase B and phase C are equal, i.e., V_AB = V_CA, and the second capacitor C2 is empty, i.e., V_BC = 0.

[0082] As Fig.10 shown, an embodiment of the present application provides a schematic diagram of a circuit state with a short circuit between phases C and A. The meanings of the respective identifiers in this figure are the same as those of the same identifiers in Figure 2 and will not be elaborated here.

[0083] In this circuit state, if |V_BC + V_CA - V_AB| < V_min and V_CA < V_min, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is a short circuit between phases C and A. Where in the short circuit state between phases C and A, the potentials of phase C and phase A are equal, i.e., V_AB = V_BC, and the third capacitor C3 is empty, i.e., V_CA = 0.

[0084] It can be seen that in this example, for the circuit state of a short circuit between two phases in a three-phase power supply circuit, the mode switching control circuit can accurately determine any one of the circuit states of a short circuit between phases A and B, a short circuit between phases B and C, and a short circuit between phases C and A through the correlation relationship of the three line voltages and the magnitude relationship between the short-circuited phase line voltage and the voltage threshold in the state of three-phase power supply and non-short circuit of the N line.

[0085] In a possible example, if V_min_L < k × V_max_L and V_min_L > V_min, where k is the maximum allowable three-phase unbalance gain preset for the system, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is three-phase unbalance.

[0086] It can be seen that in this example, for the circuit state of three-phase unbalance in a three-phase power supply circuit, the mode switching control circuit can accurately determine the circuit state of three-phase unbalance according to the relationship between the minimum line voltage and the maximum line voltage and the relationship between the minimum line voltage and the voltage threshold in the state of three-phase power supply and non-short circuit of the N line.

[0087] In a possible example, as Fig.11 shown, an embodiment of the present application provides a schematic diagram of a fault-free circuit state. The meanings of the respective identifiers in this figure are the same as those of the same identifiers in Figure 2 and will not be elaborated here.

[0088] In this circuit state, if V_min_L > V_min, V_min_P > V_min, and V_min_P is the minimum value of V_A, V_B, and V_C, then the three-phase current source is in the second type of power supply state, and the second type of power supply state is the fault-free state;

[0089] As Fig.12 shown, an embodiment of the present application provides a schematic diagram of a circuit state of three-phase phase loss. The meanings of the respective identifiers in this figure are the same as those of the same identifiers in Figure 2 and will not be elaborated here.

[0090] In this circuit state, if V_AB = V_CA = V_BC < V_min and V_A = V_B = V_C < V_min, then the three-phase current source is in the second type of power supply state, and the second type of power supply state is three-phase phase loss;

[0091] As Fig.13 shown, an embodiment of the present application provides a schematic diagram of a circuit state of three-phase short circuit. The meanings of the respective identifiers in this figure are the same as those of the same identifiers in Figure 2 and will not be elaborated here.

[0092] In this circuit state, if V_AB = V_CA = V_BC < V_min and V_A = V_B = V_C > V_min, then the three-phase current source is in the second type of power supply state, and the second type of power supply state is three-phase short circuit.

[0093] It can be seen that in this example, for the circuit states of fault-free, three-phase phase loss, and three-phase short circuit in a three-phase power supply circuit, the mode switching control circuit can accurately determine each circuit state according to the relationship between the three line voltages and the three phase voltages and the voltage threshold when the three-phase power supply is not short-circuited with the N line.

[0094] In a possible example, as Fig.14 shown, an embodiment of the present application provides a schematic diagram of a circuit state with BN short circuit and AB phase loss. The meanings of the respective identifiers in this figure are the same as those of the same identifiers in Figure 2 and will not be elaborated here.

[0095] In this circuit state, if |V_AB + V_CA - V_BC| < V_min and V_CA > V_min, then the three-phase current source is in the third type of power supply state, and the third type of power supply state is AB phase loss; among them, in the circuit state of BN short circuit and AB phase loss, the C phase supplies power, and the second capacitor C2 has a state of being charged first and then discharging to the first capacitor C1 and the third capacitor C3 until balance. The stored electrical energy of the second capacitor C2 is equal to the sum of the stored electrical energies of the first capacitor C1 and the third capacitor C3, that is, V_BC = V_CA + V_AB, and V_CA is greater than zero;

[0096] As shown Fig.15 in the figure, an embodiment of the present application provides a schematic diagram of a circuit state with BN short - circuited and BC phase open - phase. The meanings of the respective identifiers in this figure are the same as those of the same identifiers in Figure 2 , and will not be elaborated here.

[0097] In this circuit state, if |V_BC + V_CA - V_AB| < V_min and V_CA > V_min, then the three - phase current source is in the third - type power - supply state, and the third - type power - supply state is BC phase open - phase. In the circuit state of BN short - circuited and BC phase open - phase, the A phase supplies power. There is a state where the first capacitor C1 is charged and then discharges to the second capacitor C2 and the third capacitor C3 until balance. The stored electrical energy of the first capacitor C1 is equal to the sum of the stored electrical energies of the second capacitor C2 and the third capacitor C3, that is, V_AB = V_BC + V_CA, and V_CA is greater than zero;

[0098] It can be seen that in this example, for the unbalanced circuit state in a three - phase power - supply circuit, the mode - switching control circuit can accurately determine the unbalanced circuit state according to the relationship of the three line voltages and the relationship between the AC line voltage and the voltage threshold in the BN short - circuited state.

[0099] In a possible example, the single - phase open - phase includes A - phase open - phase, B - phase open - phase, or C - phase open - phase; the two - phase short - circuit includes AB - phase short - circuit, BC - phase short - circuit, CA - phase short - circuit; and adjusting the power - supply mode of the input mode - switching circuit according to the power - supply state to overcome the influence of the power - supply state includes:

[0100] If the power - supply state is A - phase open - phase, then adjust the power - supply mode of the input mode - switching circuit to BC - phase input mode;

[0101] If the power - supply state is B - phase open - phase, then adjust the power - supply mode of the input mode - switching circuit to AC - phase input mode;

[0102] If the power - supply state is C - phase open - phase, then adjust the power - supply mode of the input mode - switching circuit to AB - phase input mode;

[0103] If the power - supply state is AB - phase short - circuit, then adjust the power - supply mode of the input mode - switching circuit to BC - phase input mode;

[0104] If the power - supply state is BC - phase short - circuit, then adjust the power - supply mode of the input mode - switching circuit to AC - phase input mode;

[0105] If the power supply state is that the CA phase is short-circuited, adjusting the power supply mode of the input mode switching circuit to the AB phase input mode;

[0106] If the power supply state is the three-phase unbalance, the power supply mode of the input mode switching circuit is adjusted to disconnect the phase with the lowest phase voltage and control the two phases with higher phase voltage to operate;

[0107] If the power supply state is that the AB phase is missing, adjusting the power supply mode of the input mode switching circuit to the CN single-phase input mode;

[0108] If the power supply state is that the BC phase is missing, adjusting the power supply mode of the input mode switching circuit to the AN single-phase input mode;

[0109] If the power supply state is that the AC phase is missing, adjusting the power supply mode of the input mode switching circuit to a BN single-phase input mode;

[0110] If the power supply state is the three-phase short circuit, adjusting the power supply mode of the input mode switching circuit to the CN single-phase input mode;

[0111] If the power supply state is the three-phase loss, the power supply mode of the input mode switching circuit is adjusted to an off-grid mode.

[0112] Among them, Figure 3 As shown, the AB phase input mode corresponds to the following circuit state: the circuit including the third switch K3, the fourth switch K4, the first port K11 of the first switch K1, and the third port K13 of the first switch K1 is in the on state, and the first port K21 of the second switch K2 and the third port K23 of the second switch K2 are selected, and the fifth switch K5 is disconnected;

[0113] The BC phase input mode corresponds to the following circuit state: the circuit including 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, and the first port K21 of the second switch K2 is in the on state, and the third switch K3 is off;

[0114] The CA phase input mode corresponds to the following circuit state: the circuit including the third switch K3, the fifth switch K5, the third port K23 of the second switch K2, and the first port K21 of the second switch K2 is in the on state, and the fourth switch K4 is off, and the first port K11 of the first switch K1 and the third port K13 of the first switch K1 are enabled;

[0115] The AN single-phase input mode corresponds to the following circuit state: the circuit including 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 is in the on state, and the fifth switch K5 is off, and the first port K21 of the second switch K2 and the third port K23 of the second switch K2 are selected;

[0116] The BN single-phase input mode corresponds to the following circuit state: the circuit including 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 is in the on state, and the third switch K3 is off;

[0117] The CN single-phase input mode corresponds to the following circuit state: the circuit including the first port K21 of the second switch, the third port K23 of the second switch, 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 is in the on state, and the third switch K3 is off;

[0118] The off-grid mode corresponds to the following circuit state: the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 are all disconnected;

[0119] It can be seen that in this example, the three-phase power supply circuit can control the switch state in the input mode switching circuit through the control circuit, thereby achieving accurate adaptation of the input mode and the power supply state on the current source side, and improving the real-time performance of automatic adjustment.

[0120] The embodiment of the present application provides a mode control device based on power supply status detection, which is used to execute the steps executed by the electronic device in the above mode control method based on power supply status detection. The mode control device based on power supply status detection provided by the embodiment of the present application may include modules corresponding to the corresponding steps.

[0121] The embodiment of the present application can divide the functional modules of the mode control device based on power supply status detection 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.

[0122] In the case of dividing each functional module into corresponding functional modules, Fig.16A possible structural schematic diagram of the mode control device based on power supply status detection involved in the above embodiment is shown. A control circuit applied to a three-phase power supply circuit, the three-phase power supply circuit includes a three-phase current source, a voltage sampling circuit, the control circuit, an input mode switching circuit, a rectifier circuit and a load, the three-phase current source is electrically connected to the voltage sampling circuit and the input mode switching circuit, the control circuit is connected to the voltage sampling circuit and the input mode switching circuit, the input mode switching circuit is connected to the rectifier circuit, the rectifier circuit is connected to the load, and the input mode switching circuit supports any one of a three-phase input mode, a two-phase input mode and a single-phase input mode; the device includes:

[0123] A determining unit 1601 is used to obtain a first phase voltage V_A, a second phase voltage V_B, a third phase voltage V_C, a first line voltage V_AB, a second line voltage V_BC and a third line voltage V_CA of the three-phase current source through the voltage sampling circuit;

[0124] The determining unit 1601 is further configured to determine the power supply state of the three-phase current source according to V_A, V_B, V_C, V_AB, V_BC, V_CA, a preset voltage threshold V_min, and a power supply mode of the input mode switching circuit, wherein the power supply state includes any one of no fault, single-phase loss, two-phase loss, three-phase loss, two-phase short circuit, three-phase short circuit, and three-phase imbalance;

[0125] The adjusting unit 1602 is configured to adjust the power supply mode of the input mode switching circuit according to the power supply state to overcome the influence of the power supply state.

[0126] In a possible example, in determining the power supply state of the three-phase current source according to V_A, V_B, V_C, V_AB, V_BC, V_CA, a preset voltage threshold V_min, and the power supply mode of the input mode switching circuit, the determining unit 1601 is specifically used to: control the power supply mode of the input mode switching circuit to the three-phase input mode so that the A phase, the B phase, and the C phase of the three-phase current source are all in a non-short-circuited state with the neutral line N line of the three-phase current source;

[0127] Detecting whether the three-phase current source is in a first power supply state according to V_AB, V_BC, V_CA, and V_min, wherein the first power supply state includes any one of the single-phase loss, the two-phase short circuit, and the three-phase imbalance;

[0128] If it is detected that the three-phase current source is in the first type of power supply state, determining that the detected first type of power supply state is the power supply state of the three-phase current source;

[0129] If it is detected that the three-phase current source is not in the first type of power supply state, then it is detected whether the three-phase current source is in the second type of power supply state according to V_AB, V_BC, V_CA, V_min, V_A, V_B, and V_C. The second type of power supply state includes any one of no fault, three-phase open phase, and three-phase short circuit;

[0130] If it is detected that the three-phase current source is in the second type of power supply state, then the detected second type of power supply state is determined as the power supply state of the three-phase current source;

[0131] If it is detected that the three-phase current source is not in the second type of power supply state, then the power supply mode of the input mode switching circuit is controlled to be switched to the AC phase input mode so that the B phase is shorted to the N line; and, it is detected whether the three-phase current source is in the third type of power supply state according to V_AB, V_BC, V_CA, and V_min. The third type of power supply state includes open phase of AB phase or open phase of BC phase;

[0132] If it is detected that the three-phase current source is in the third type of power supply state, then the detected third type of power supply state is determined as the power supply state of the three-phase current source;

[0133] If it is detected that the three-phase current source is not in the third type of power supply state, then open phase of AC phase is determined as the power supply state of the three-phase current source.

[0134] In a possible example, the single-phase open phase includes open phase of A phase, open phase of B phase, or open phase of C phase;

[0135] If it is detected that the three-phase current source is in the first type of power supply state and the first type of power supply state is open phase of A phase, then |V_AB + V_CA - V_BC| < V_min, and V_min_L > V_min, where V_min_L is the minimum value among V_AB, V_CA, and V_BC;

[0136] If it is detected that the three-phase current source is in the first type of power supply state and the first type of power supply state is open phase of B phase, then |V_AB + V_BC - V_CA| < V_min, and V_min_L > V_min;

[0137] If it is detected that the three-phase current source is in the first type of power supply state and the first type of power supply state is open phase of C phase, then |V_BC + V_CA - V_AB| < V_min, and V_min_L > V_min.

[0138] In a possible example, the two-phase short circuit includes short circuit of AB phase, short circuit of BC phase, and short circuit of CA phase;

[0139] If it is detected that the three-phase current source is in the first type of power supply state and the first type of power supply state is a short circuit between phases A and B, then |V_AB + V_CA - V_BC| < V_min, and V_AB < V_min;

[0140] If it is detected that the three-phase current source is in the first type of power supply state and the first type of power supply state is a short circuit between phases B and C, then |V_AB + V_BC - V_CA| < V_min, and V_BC < V_min;

[0141] If it is detected that the three-phase current source is in the first type of power supply state and the first type of power supply state is a short circuit between phases C and A, then |V_BC + V_CA - V_AB| < V_min, and V_CA < V_min.

[0142] In a possible example, if it is detected that the three-phase current source is in the first type of power supply state and the first type of power supply state is a three-phase imbalance, then V_min_L < k × V_max_L, and V_min_L > V_min, where k is the preset maximum allowable three-phase imbalance gain of the system.

[0143] In a possible example, if it is detected that the three-phase current source is in the second type of power supply state and the second type of power supply state is a no-fault state, then V_min_L > V_min, V_min_P > V_min, where V_min_P is the minimum value of V_A, V_B, and V_C;

[0144] If it is detected that the three-phase current source is in the second type of power supply state and the second type of power supply state is a three-phase phase loss, then V_AB = V_CA = V_BC < V_min, V_A = V_B = V_C < V_min;

[0145] If it is detected that the three-phase current source is in the second type of power supply state and the second type of power supply state is a three-phase short circuit, then V_AB = V_CA = V_BC < V_min, V_A = V_B = V_C > V_min.

[0146] In a possible example, if it is detected that the three-phase current source is in the third type of power supply state and the third type of power supply state is a phase loss between phases A and B, then |V_AB + V_CA - V_BC| < V_min, and V_CA > V_min;

[0147] If it is detected that the three-phase current source is in the third power supply state and the third power supply state is a BC-phase open phase, then |V_BC + V_CA - V_AB| < V_min, and V_CA > V_min.

[0148] In a possible example, the single-phase open phase includes an A-phase open phase, a B-phase open phase, or a C-phase open phase; the two-phase short circuit includes an AB-phase short circuit, a BC-phase short circuit, and a CA-phase short circuit; in terms of adjusting the power supply mode of the input mode switching circuit according to the power supply state to overcome the influence of the power supply state, the determining unit 1601 is specifically configured to: Adjusting the power supply mode of the input mode switching circuit according to the power supply state to overcome the influence of the power supply state includes:

[0149] If the power supply state is an A-phase open phase, then adjust the power supply mode of the input mode switching circuit to a BC-phase input mode;

[0150] If the power supply state is a B-phase open phase, then adjust the power supply mode of the input mode switching circuit to an AC-phase input mode;

[0151] If the power supply state is a C-phase open phase, then adjust the power supply mode of the input mode switching circuit to an AB-phase input mode;

[0152] If the power supply state is an AB-phase short circuit, then adjust the power supply mode of the input mode switching circuit to a BC-phase input mode;

[0153] If the power supply state is a BC-phase short circuit, then adjust the power supply mode of the input mode switching circuit to an AC-phase input mode;

[0154] If the power supply state is a CA-phase short circuit, then adjust the power supply mode of the input mode switching circuit to an AB-phase input mode;

[0155] If the power supply state is a three-phase imbalance, then adjust the power supply mode of the input mode switching circuit to disconnect the phase with the lowest phase voltage, and control the two phases with higher phase voltages to operate;

[0156] If the power supply state is an AB-phase open phase, then adjust the power supply mode of the input mode switching circuit to a CN single-phase input mode;

[0157] If the power supply state is a BC-phase open phase, then adjust the power supply mode of the input mode switching circuit to an AN single-phase input mode;

[0158] If the power supply state is an AC-phase open phase, then adjust the power supply mode of the input mode switching circuit to a BN single-phase input mode;

[0159] If the power supply state is the three-phase short circuit, adjusting the power supply mode of the input mode switching circuit to the CN single-phase input mode;

[0160] If the power supply state is the three-phase loss, the power supply mode of the input mode switching circuit is adjusted to an off-grid mode.

[0161] In a possible example, the voltage sampling circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, and 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 for suppressing electromagnetic interference; wherein, the first end of the first capacitor C1, the first end of the third capacitor C3, and the first end of the first resistor R1 are all connected to the A phase, and the second end of the first resistor R1 is connected to the first end of the second resistor R2; the second end of the first capacitor C1, the first end of the second capacitor C2, and the first end of the third resistor R3 are all connected to the B phase, and the second end of the third resistor R3 is connected to the first end of the fourth resistor R4; the first end of the second capacitor C2, the second end of the third capacitor C3, and the first end of the fifth resistor R5 are all connected to the C phase, and the second end of the fifth resistor R5 is connected to the 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 N line.

[0162] 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, and a fifth switch K5, wherein the first port K11 of the first switch K1 is connected to the B phase, the first port K21 of the second switch K2 is connected to the C phase, the first port K31 of the third switch K3 is connected to the A phase, the second port K12 of the first switch K1 and the second port K22 of the second switch K2 are both connected to the N line, the first port K41 of the fourth switch K4 is connected to the third port K13 of the first switch K1; the first port K51 of the fifth switch K5 is connected to the third port K23 of the second switch K2.

[0163] In the case of using an integrated unit, a structural diagram of another mode control device based on power supply status detection provided in an embodiment of the present application is as follows: Fig.17 As shown. Fig.17 In the embodiment, the mode control device based on power supply status detection includes: a processing module 170 and a communication module 171. The processing module 170 is used to control and manage the actions of the mode control device based on power supply status detection, for example, the steps performed by the determination unit 1601 and the adjustment unit 1602, and / or other processes for performing the technology described herein. The communication module 171 is used to support the interaction between the mode control device based on power supply status detection and other devices. Fig.17 As shown, the mode control device based on power supply status detection may further include a storage module 172, and the storage module 172 is used to store program codes and data of the mode control device based on power supply status detection.

[0164] Among them, the processing module 170 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, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The communication module 171 can be a transceiver, an RF circuit or a communication interface, and the like. The storage module 172 can be a memory.

[0165] 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 above-mentioned mode control device based on power supply status detection can execute the above-mentioned Figure 4 The steps performed by the electronic device in the mode control method based on power supply status detection are shown.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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 mode control method based on power supply status detection, characterized in that: A control circuit applied to a three-phase power supply circuit, the three-phase power supply circuit comprising a three-phase current source, a voltage sampling circuit, the control circuit, an input mode switching circuit, a rectifier circuit and a load, the three-phase current source is electrically connected to the voltage sampling circuit and the input mode switching circuit, the control circuit is connected to the voltage sampling circuit and the input mode switching circuit, the input mode switching circuit is connected to the rectifier circuit, the rectifier circuit is connected to the load, and the input mode switching circuit supports any one of a three-phase input mode, a two-phase input mode and a single-phase input mode; The input mode switching circuit includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, and a fifth switch K5, wherein the first port K11 of the first switch K1 is connected to the B phase of the three-phase current source, the first port K21 of the second switch K2 is connected to the C phase of the three-phase current source, the first port K31 of the third switch K3 is connected to the A phase of the three-phase current source, the second port K12 of the first switch K1 and the second port K22 of the second switch K2 are both connected to the N line of the three-phase current source, the first port K41 of the fourth switch K4 is connected to the third port K13 of the first switch K1; the first port K51 of the fifth switch K5 is connected to the third port K23 of the second switch K2; The rectifier circuit is a three-phase Vienna rectifier circuit, the second port K32 of the third switch K3 is connected to the A-phase rectifier bridge arm of the three-phase Vienna rectifier circuit, the second port K42 of the fourth switch K4 is connected to the B-phase rectifier bridge arm of the three-phase Vienna rectifier circuit, and the second port K52 of the fifth switch K5 is connected to the C-phase rectifier bridge arm of the three-phase Vienna rectifier circuit; The method comprises: Acquire the first phase voltage V_A, the second phase voltage V_B, the third phase voltage V_C, the first line voltage V_AB, the second line voltage V_BC and the third line voltage V_CA of the three-phase current source through the voltage sampling circuit; According to V_A, V_B, V_C, V_AB, V_BC, V_CA, a preset voltage threshold V_min, and the power supply mode of the input mode switching circuit, determine the power supply state of the three-phase current source, wherein the power supply state includes any one of no fault, single-phase loss, two-phase loss, three-phase loss, two-phase short circuit, three-phase short circuit, and three-phase imbalance; The power supply mode of the input mode switching circuit is adjusted according to the power supply state to overcome the influence of the power supply state.

2. The method according to claim 1, characterized in that The step of determining the power supply state of the three-phase current source according to V_A, V_B, V_C, V_AB, V_BC, V_CA, a preset voltage threshold V_min, and a power supply mode of the input mode switching circuit includes: Controlling the power supply mode of the input mode switching circuit to the three-phase input mode so that the A phase, the B phase and the C phase of the three-phase current source are all in a non-short-circuited state with the neutral line N of the three-phase current source; Detect whether the three-phase current source is in the first type of power supply state according to V_AB, V_BC, V_CA, and V_min. The first type of power supply state includes any one of single-phase open phase, two-phase short circuit, and three-phase imbalance; If it is detected that the three-phase current source is in the first type of power supply state, determine the detected first type of power supply state as the power supply state of the three-phase current source; If it is detected that the three-phase current source is not in the first type of power supply state, detect whether the three-phase current source is in the second type of power supply state according to V_AB, V_BC, V_CA, V_min, V_A, V_B, and V_C. The second type of power supply state includes any one of no fault, three-phase open phase, and three-phase short circuit; If it is detected that the three-phase current source is in the second type of power supply state, determine the detected second type of power supply state as the power supply state of the three-phase current source; If it is detected that the three-phase current source is not in the second type of power supply state, control the power supply mode of the input mode switching circuit to switch to the AC phase input mode so that the B phase is shorted to the N line; and, detect whether the three-phase current source is in the third type of power supply state according to V_AB, V_BC, V_CA, and V_min. The third type of power supply state includes AB phase open phase or BC phase open phase; If it is detected that the three-phase current source is in the third type of power supply state, determine the detected third type of power supply state as the power supply state of the three-phase current source; If it is detected that the three-phase current source is not in the third type of power supply state, determine that the AC phase open phase is the power supply state of the three-phase current source.

3. The method according to claim 2, characterized in that The single-phase open phase includes A phase open phase, B phase open phase, or C phase open phase; If |V_AB + V_CA - V_BC| < V_min, and V_min_L > V_min, where V_min_L is the minimum value among V_AB, V_CA, and V_BC, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is A phase open phase; If |V_AB + V_BC - V_CA| < V_min, and V_min_L > V_min, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is B phase open phase; If |V_BC + V_CA - V_AB| < V_min, and V_min_L > V_min, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is C phase open phase.

4. The method according to claim 2 or 3, characterized in that: The two-phase short circuit includes AB phase short circuit, BC phase short circuit, and CA phase short circuit; If |V_AB + V_CA - V_BC| < V_min, and V_AB < V_min, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is AB phase short circuit; If |V_AB + V_BC - V_CA| < V_min and V_BC < V_min, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is that the BC phase is short-circuited; If |V_BC + V_CA - V_AB| < V_min and V_CA < V_min, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is that the CA phase is short-circuited.

5. The method according to claim 2 or 3, wherein If V_min_L < k × V_max_L, and V_min_L > V_min, where V_max_L is the maximum value among V_AB, V_BC, and V_CA, and k is the maximum allowable three-phase unbalance gain preset for the system, then the three-phase current source is in the first type of power supply state, and the first type of power supply state is three-phase unbalance.

6. The method according to claim 2 or 3, wherein If V_min_L > V_min and V_min_P > V_min, where V_min_P is the minimum value among V_A, V_B, and V_C, then the three-phase current source is in the second type of power supply state, and the second type of power supply state is no fault; If V_AB = V_CA = V_BC < V_min and V_A = V_B = V_C < V_min, then the three-phase current source is in the second type of power supply state, and the second type of power supply state is three-phase phase loss; If V_AB = V_CA = V_BC < V_min and V_A = V_B = V_C > V_min, then the three-phase current source is in the second type of power supply state, and the second type of power supply state is three-phase short circuit.

7. The method according to claim 2 or 3, wherein If |V_AB + V_CA - V_BC| < V_min and V_CA > V_min, then the three-phase current source is in the third type of power supply state, and the third type of power supply state is that the AB phase is phase lost; If |V_BC + V_CA - V_AB| < V_min and V_CA > V_min, then the three-phase current source is in the third type of power supply state, and the third type of power supply state is that the BC phase is phase lost.

8. The method according to claim 2 or 3, characterized in that: The single-phase phase loss includes phase loss of phase A, phase loss of phase B, or phase loss of phase C; the two-phase short circuit includes short circuit of AB phase, short circuit of BC phase, and short circuit of CA phase; adjusting the power supply mode of the input mode switching circuit according to the power supply state to overcome the influence of the power supply state includes: If the power supply state is phase loss of phase A, then adjust the power supply mode of the input mode switching circuit to BC phase input mode; If the power supply state is phase loss of phase B, then adjust the power supply mode of the input mode switching circuit to AC phase input mode; If the power supply state is phase loss of phase C, then adjust the power supply mode of the input mode switching circuit to AB phase input mode; If the power supply state is that the AB phases are short-circuited, adjusting the power supply mode of the input mode switching circuit to the BC phase input mode; If the power supply state is that the BC phase is short-circuited, adjusting the power supply mode of the input mode switching circuit to the AC phase input mode; If the power supply state is that the CA phase is short-circuited, adjusting the power supply mode of the input mode switching circuit to the AB phase input mode; If the power supply state is the three-phase unbalance, the power supply mode of the input mode switching circuit is adjusted to disconnect the phase with the lowest phase voltage and control the two phases with higher phase voltage to operate; If the power supply state is that the AB phase is missing, adjusting the power supply mode of the input mode switching circuit to the CN single-phase input mode; If the power supply state is that the BC phase is missing, adjusting the power supply mode of the input mode switching circuit to the AN single-phase input mode; If the power supply state is that the AC phase is missing, adjusting the power supply mode of the input mode switching circuit to a BN single-phase input mode; If the power supply state is the three-phase short circuit, adjusting the power supply mode of the input mode switching circuit to the CN single-phase input mode; If the power supply state is the three-phase loss, the power supply mode of the input mode switching circuit is adjusted to an off-grid mode.

9. The method according to claim 8, characterized in that The voltage sampling circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, and 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 for suppressing electromagnetic interference; wherein, a first end of the first capacitor C1, a first end of the third capacitor C3, and a first end of the first resistor R1 are all connected to the A phase, and a second end of the first resistor R1 is connected to a first end of the second resistor R2; a second end of the first capacitor C1, a first end of the second capacitor C2, and a first end of the third resistor R3 are all connected to the B phase, and a second end of the third resistor R3 is connected to a first end of the fourth resistor R4; a first end of the second capacitor C2, a second end of the third capacitor C3, and a first end of the fifth resistor R5 are all connected to the C phase, and a second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6; a second end of the second resistor R2, a second end of the fourth resistor R4, and a second end of the sixth resistor R6 are all connected to the N line.

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