Input mode adjustable circuit and power supply mode control method

Abstract

The present application provides an input mode adjustable circuit and a power supply mode control method, the circuit includes a third switch unit of the input mode switching circuit connected to phase A, a first switch unit connected to phase B, a first switch unit connected to a sixth switch unit, and a first switch unit connected to a fourth switch unit; a second switch unit connected to phase C, a second switch unit connected to a sixth switch unit, and a second switch unit connected to a fifth switch unit; a sixth switch unit connected to line N; a rectifier circuit, connecting the third switch unit, the fourth switch unit, and the fifth switch unit, and also connecting the first port and the second port of the load circuit. Through mode switching control, the AC source circuit system has high adaptability and high reliability in various power supply mode scenarios, and has the ability to use relays in parallel in high-power scenarios.

Description

Technical Field

[0001] The present application relates to the technical field of mode switching control of an electromechanical converter functional circuit system, and in particular to an input mode adjustable circuit and a power supply mode control method. Background Art

[0002] At present, in the three-phase AC power supply system with electromechanical converter function, in the application scenario where three-phase and single-phase switching is required, the common practice is to select one of the phases in the rectifier circuit, such as Figure 1 As shown in the circuit diagram of connecting the phase line and N line of phase C to the rectifier circuit through the relay K1A, the three-phase current source of the three-phase four-wire system includes A (representing phase A), B (representing phase B), C (representing phase C), and N (representing the center line) in the figure. Relay K1A is added between the phase line and N line of phase C and the rectifier circuit. By controlling the contacts of relay K1A, the single-phase bridge arm of the rectifier circuit can be connected to the N line through the relay, thereby realizing AN or BN single-phase power supply. For example, Figure 2 The circuit diagram shown is a circuit diagram for realizing single-phase power supply to AN by selecting the N line and the rectifier circuit through the relay K1A. The single-phase power supply to AN can be realized by controlling the contacts of the relay K1A.

[0003] However, this power supply method has great limitations, such as Figure 3 The circuit diagram shown in the figure shows that the C phase has power but the relay K1A selects the N line and the rectifier circuit. If only the C phase connected to the relay has power on the three-phase current source side, it will not work when the C phase is powered. In addition, in the application of high-power rectifier circuits, relays need to be used in parallel. If there is a delay in the action of the parallel relays, a single-phase short circuit may be caused, such as Figure 4 The circuit diagram shown is a circuit diagram of a CN single-phase short circuit caused by asynchronism of the parallel relay K1A and relay K1B. The relay K1A and relay K1B are asynchronous, and the synchronously connected state of the two relays will cause a CN single-phase short circuit.

[0004] In addition, when the three-phase AC power supply system works in single-phase or two-phase mode, it is necessary to disconnect the unconnected phase to prevent the surge voltage that may occur in the phase from affecting other phases. Summary of the invention

[0005] The embodiments of the present application provide an input mode adjustable circuit and a power supply mode control method. Through mode switching control, an AC source circuit system with an electromechanical converter function can have high adaptability and high reliability in various power supply mode scenarios, and at the same time has the ability to use relays in parallel in high-power scenarios.

[0006] In a first aspect, an embodiment of the present application provides an input mode adjustable circuit, comprising:

[0007] An input mode switching circuit includes a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a fifth switch unit and a sixth switch unit,

[0008] The first port of the third switch unit is connected to phase A of the three-phase AC power supply;

[0009] The first port of the first switch unit is connected to the B phase of the three-phase AC power supply, the second port of the first switch unit is connected to the first port of the sixth switch unit, and the third port of the first switch unit is connected to the first port of the fourth switch unit;

[0010] The first port of the second switch unit is connected to the C phase of the three-phase AC power supply, the second port of the second switch unit is connected to the first port of the sixth switch unit, and the third port of the second switch unit is connected to the first port of the fifth switch unit;

[0011] The second port of the sixth switch unit is connected to the N line of the three-phase AC power supply;

[0012] A rectifier circuit comprises a first input port, a second input port, a third input port, a first output port and a second output port, wherein the first input port is connected to the second port of the third switch unit, the second input port is connected to the second port of the fourth switch unit, the third input port is connected to the second port of the fifth switch unit, the first output port is connected to the first port of a load circuit, and the second output port is connected to the second port of the load circuit.

[0013] In a possible implementation manner, the input mode adjustable circuit further includes a control circuit.

[0014] The plurality of control ports of the control circuit are connected to the control port of the first switch unit, the control port of the second switch unit, the control port of the third switch unit, the control port of the fourth switch unit, the control port of the fifth switch unit and the control port of the sixth switch unit;

[0015] The control circuit is used to select the first port of the first switch unit or the second port of the first switch unit, and to select the first port of the second switch unit or the second port of the second switch unit; and to control the opening and closing of the third switch unit, the fourth switch unit, the fifth switch unit and the sixth switch unit.

[0016] In a possible implementation manner, the first switch unit includes two first relays used in parallel, and the second switch unit includes two second relays used in parallel;

[0017] The disconnected state of the sixth switch unit is used to keep the first circuit in an open circuit state when the two first relays switch their states asynchronously to avoid a short circuit state of the first circuit, wherein the first circuit includes the B phase, the two first relays, the sixth switch unit and the N line; or

[0018] The disconnected state of the sixth switch unit is used to keep the second circuit in an open state when the two second relays switch their states asynchronously to avoid a short circuit state of the second circuit, wherein the second circuit includes the C phase, the two second relays, the sixth switch unit and the N line.

[0019] In a possible implementation manner, the disconnected state of the third switch unit is used to overcome a first surge voltage generated by the rectifier circuit when the A phase is switched from a non-powered state to a powered state;

[0020] The disconnected state of the fourth switch unit is used to overcome the second surge voltage generated by the rectifier circuit when the B phase is switched from a non-powered state to a powered state;

[0021] The disconnected state of the fifth switch unit is used to overcome the third surge voltage generated by the rectifier circuit when the C phase is switched from a non-powered state to a powered state.

[0022] In a possible implementation manner, the rectifier circuit includes a first rectifier bridge arm corresponding to A, a second rectifier bridge arm corresponding to B, and a third rectifier bridge arm corresponding to C;

[0023] The first switch unit is used to switch the rectifier circuit and the second rectifier bridge arm to the N line, so that the rectifier circuit can control the transmission power in the AN single-phase power supply mode or the CN single-phase power supply mode;

[0024] The second switch unit is used to switch the rectifier circuit and the third rectifier bridge arm to the N line, so that the rectifier circuit can control the transmission power in the AN single-phase power supply mode or the BN single-phase power supply mode.

[0025] In a possible implementation, if the input mode adjustable circuit is in a three-phase power supply mode, the first port of the first switch unit is connected and the second port is disconnected, the first port of the second switch unit is connected and the second port is disconnected, the third switch unit, the fourth switch unit, and the fifth switch unit are all connected, and the sixth switch unit is disconnected.

[0026] In a possible implementation manner, if the input mode adjustable circuit is in the AB two-phase power supply mode, the first port of the first switch unit is turned on and the second port is turned off, the third switch unit and the fourth switch unit are turned on, and the fifth switch unit and the sixth switch unit are turned off;

[0027] If the input mode adjustable circuit is in the AC two-phase power supply mode, the first port of the second switch unit is turned on and the second port is turned off, the third switch unit and the fifth switch unit are turned on, and the fourth switch unit and the sixth switch unit are turned off;

[0028] If the input mode adjustable circuit is in the BC two-phase power supply mode, the first port of the first switch unit is connected and the second port is disconnected, the first port of the second switch unit is connected and the second port is disconnected, the fourth switch unit and the fifth switch unit are connected, and the third switch unit and the sixth switch unit are disconnected.

[0029] In a possible implementation, if the input mode adjustable circuit is in the AN single-phase power supply mode, the first port of the first switch unit is connected and the second port is disconnected, the first port of the second switch unit is disconnected and the second port is connected, the third switch unit, the fifth switch unit, and the sixth switch unit are all connected, and the fourth switch unit is disconnected; or, the first port of the first switch unit is disconnected and the second port is connected, the first port of the second switch unit is connected and the second port is disconnected, the third switch unit, the fourth switch unit, and the sixth switch unit are all connected, and the fifth switch unit is disconnected;

[0030] If the input mode adjustable circuit is in the BN single-phase power supply mode, the first port of the first switch unit is connected and the second port is disconnected, the first port of the second switch unit is disconnected and the second port is connected, the fourth switch unit, the fifth switch unit, and the sixth switch unit are all connected, and the third switch unit is disconnected;

[0031] If the input mode adjustable circuit is in the CN single-phase power supply mode, the first port of the first switch unit is disconnected and the second port is connected, the first port of the second switch unit is connected and the second port is disconnected, the fourth switch unit, the fifth switch unit, and the sixth switch unit are all connected, and the third switch unit is disconnected.

[0032] In a possible implementation manner, the third switch unit, the fourth switch unit, the fifth switch unit, and the sixth switch unit are unidirectional switch units;

[0033] The rectifier circuit is a Vienna rectifier circuit.

[0034] In a second aspect, an embodiment of the present application provides a power supply mode control method, which is applied to the circuit as described in any one of the first aspects, and the method includes:

[0035] A mode switching instruction is detected, where the power supply mode indicated by the mode switching instruction includes any one of the following: a three-phase power supply mode, an AB two-phase power supply mode, an AC two-phase power supply mode, a BC two-phase power supply mode, an AN single-phase power supply mode, a BN single-phase power supply mode, and a CN single-phase power supply mode;

[0036] In response to the mode switching instruction, determining, according to the power supply mode indicated by the mode switching instruction, a first action state to which the first switch unit needs to be adjusted, a second action state to which the second switch unit needs to be adjusted, a third action state to which the third switch unit needs to be adjusted, a fourth action state to which the fourth switch unit needs to be adjusted, a fifth action state to which the fifth switch unit needs to be adjusted, and a sixth action state to which the sixth switch unit needs to be adjusted;

[0037] adjusting the third switch unit to the third action state, the fourth switch unit to the fourth action state, and the fifth switch unit to the fifth action state; and,

[0038] Controlling the sixth switch unit to be in an off state;

[0039] Controlling the first switch unit to the first action state, and controlling the second switch unit to the second action state;

[0040] detecting whether the sixth action state of the sixth switch unit is the disconnected state;

[0041] If it is the disconnected state, controlling the three-phase AC power supply to supply power according to the power supply mode indicated by the mode switching instruction;

[0042] If it is not the disconnected state, the sixth switch unit is controlled to be in the sixth action state, and the three-phase AC power supply is controlled to supply power according to the power supply mode indicated by the mode switching instruction.

[0043] It can be seen that in the embodiment of the present application, by implementing the embodiment of the present application, since the input mode switching circuit in the input mode adjustable circuit connects the A phase through the third switch unit to realize the control of the A phase line, the first switch unit and the fourth switch unit are connected in series to realize the control of the B phase line, the second switch unit and the fifth switch unit are connected in series to realize the control of the C phase line, and the first switch unit, the second switch unit and the sixth switch unit connected to the N line are used to realize the control of the connection state between the B phase, the C phase line and the N line, so that it can be adapted and adjusted for various different power supply modes, and at the same time, due to the control of the sixth switch in high-power scenarios, the switch unit of the single-phase line is used in parallel with relays without the problem of asynchronous short circuit. It has achieved high adaptability and high reliability in various power supply mode scenarios, and at the same time has the ability to use relays in parallel in high-power scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a circuit diagram provided by the present application for switching the phase line and N line of phase C to the rectifier circuit through the relay K1A;

[0045] Figure 2 This is a circuit diagram provided by the present application for realizing AN single-phase power supply by selecting N line and rectifier circuit through relay K1A;

[0046] Figure 3 It is a circuit diagram provided by the present application in which the C phase single phase is energized but the relay K1A selects the N line and the rectifier circuit;

[0047] Figure 4 It is a circuit diagram provided by the present application in which a parallel relay K1A and a relay K1B are not synchronized and a CN single-phase short circuit occurs;

[0048] Figure 5 is a circuit diagram of an input mode adjustable circuit 10 provided in the present application;

[0049] Figure 6 is a circuit diagram of an input mode adjustable circuit 10 including a Vienna rectifier circuit provided by the present application;

[0050] Figure 7 is a circuit connection diagram of a control circuit 160 and an input mode switching circuit 100 provided in the present application;

[0051] Figure 8It is a flow chart of a power supply mode control method provided in this application. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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".

[0055] 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.

[0056] like Figure 5 As shown, the embodiment of the present application provides an input mode adjustable circuit 10, comprising:

[0057] The input mode switching circuit 100 includes a first switch unit K1, a second switch unit K2, a third switch unit K3, a fourth switch unit K4, a fifth switch unit K5 and a sixth switch unit K6.

[0058] The first port K31 of the third switch unit K3 is connected to the A phase of the three-phase AC power supply;

[0059] The first port K11 of the first switch unit K1 is connected to the B phase of the three-phase AC power supply, the second port K12 of the first switch unit K1 is connected to the first port K61 of the sixth switch unit K6, and the third port K13 of the first switch unit K1 is connected to the first port K41 of the fourth switch unit K4;

[0060] The first port K21 of the second switch unit K2 is connected to the C phase of the three-phase AC power supply, the second port K22 of the second switch unit K2 is connected to the first port K61 of the sixth switch unit K6, and the third port K23 of the second switch unit K2 is connected to the first port K51 of the fifth switch unit K5;

[0061] The second port K62 of the sixth switch unit K6 is connected to the N line of the three-phase AC power supply;

[0062] The rectifier circuit 120 includes a first input port 1201, a second input port 1202, a third input port 1203, a first output port 1204 and a second output port 1205, wherein the first input port 1201 is connected to the second port K32 of the third switch unit K3, the second input port 1202 is connected to the second port K42 of the fourth switch unit K4, the third input port 1203 is connected to the second port K52 of the fifth switch unit K5, the first output port 1204 is connected to the first port 1401 of the load circuit 140, and the second output port 1205 is connected to the second port 1402 of the load circuit 140.

[0063] The third switch unit K3, the fourth switch unit K4, the fifth switch unit K5 and the sixth switch unit K6 are unidirectional switch units; the rectifier circuit 120 is a Vienna rectifier circuit. The first switch unit K1 and the second switch unit K2 are both bidirectional switch units.

[0064] In a specific implementation, the Vienna rectifier circuit includes a three-phase inductor for boosting, a three-phase bridge arm and two DC side voltage balancing capacitors, such as Figure 6 As shown, the three-phase inductor includes a first inductor L1, a second inductor L2, and a third inductor L3, the three-phase bridge arm includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6 that play a clamping role, and a first bidirectional switch tube Q1, a second bidirectional switch tube Q2, a third bidirectional switch tube Q3, a fourth bidirectional switch tube Q4, a fifth bidirectional switch tube Q5, and a sixth bidirectional switch tube Q6 for controlling the charging and discharging of the inductor, and the two DC side equalizing capacitors include a first capacitor C1 and a second capacitor C2.

[0065] Wherein, the first end of the first inductor L1 is connected to the second end K32 of the third switch unit 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), and 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. one end (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), the first end of the second inductor L2 is connected to the second end K42 of the fourth switch unit K4, the second end of the second inductor L2 is connected to the anode of the third diode D3, the cathode of the fourth diode D4 and the first end of the third bidirectional switch tube Q3 (the first end of the third bidirectional switch tube Q3 corresponds to the cathode 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), the first end of the third inductor L3 is connected to the second end K52 of the fifth switch unit K5, 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 tube Q5 (the first end of the fifth bidirectional switch tube Q5 corresponds to the cathode of the diode of the fifth bidirectional switch tube Q5 and the drain of the MOS tube of the fifth bidirectional switch tube Q5 in the figure), and the second end of the fifth bidirectional switch tube Q5 (corresponding to the anode of the diode of the fifth bidirectional switch tube Q5 and the drain of the MOS tube of the fifth bidirectional switch tube Q5 in the figure) is connected to the first end of the sixth bidirectional switch tube Q6 (corresponding to 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 in the figure). 6), 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 first capacitor C1, the second end of the first capacitor C1 is connected to the second end of the second bidirectional switch tube Q2 (corresponding to the cathode of the diode of the second bidirectional switch tube Q2 and the drain of the MOS tube of the second bidirectional switch tube Q2 in the figure), the second end of the fourth bidirectional switch tube Q4 (corresponding to the cathode 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), the second end of the sixth bidirectional switch tube Q6 (corresponding to the sixth bidirectional switch tube Q6 in the figure) The cathode of the diode of the third bidirectional switch tube Q3 and the drain of the MOS tube of the sixth bidirectional switch tube Q6) and the first end of the second capacitor C2, the second end of the second capacitor C2 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).

[0066] Among them, the first inductor L1, the first bidirectional switch tube Q1, and the second bidirectional switch tube Q2 constitute the bridge arm corresponding to A in the rectifier bridge, the second inductor L2, the third bidirectional switch tube Q3, and the fourth bidirectional switch tube Q4 constitute the bridge arm corresponding to B in the rectifier bridge, and the third inductor L3, the fifth bidirectional switch tube Q5, and the sixth bidirectional switch tube Q6 constitute the rectifier bridge corresponding to C in the rectifier bridge. The purpose of the rectifier bridge is to make the phase of the input current and input voltage of the rectifier circuit consistent. Specifically, the control circuit samples the input voltage of the three-phase AC power supply in real time, and performs closed-loop control according to the state relationship between the input voltage and the output voltage.

[0067] Since the Vienna circuit is a commonly used circuit, the circuit structure and control mode of the circuit are only examples here and are not limited to the only ones.

[0068] In one possible example, Figure 7 As shown, the input mode adjustable circuit 10 further includes a control circuit 160,

[0069] The multiple control ports (shown as the first port, the second port, the third port, the fourth port, the fifth port, and the sixth port in the figure) of the control circuit 160 are connected to the control port K14 of the first switch unit K1, the control port K24 of the second switch unit K2, the control port K33 of the third switch unit K3, the control port K43 of the fourth switch unit K4, the control port K53 of the fifth switch unit K5, and the control port K63 of the sixth switch unit K6;

[0070] The control circuit 160 is used to select the first port K11 of the first switch unit K1 or the second port K12 of the first switch unit K1, and to select the first port K21 of the second switch unit K2 or the second port K22 of the second switch unit K2; and to control the opening and closing of the third switch unit K3, the fourth switch unit K4, the fifth switch unit K5 and the sixth switch unit K6.

[0071] Specifically, the control circuit 160 may be a circuit unit composed of a single microcontroller or multiple microcontrollers, and its multiple control ports may be connected to the aforementioned control ports in a one-to-one mapping relationship.

[0072] It can be seen that in this example, the control circuit can realize real-time detection and control of the action state of each switch unit in the input mode switching circuit, thereby improving the stability and real-time performance of the circuit control.

[0073] In a possible example, the first switch unit K1 includes two first relays used in parallel, and the second switch unit includes two second relays used in parallel;

[0074] The disconnected state of the sixth switch unit K6 is used to keep the first circuit in an open circuit state when the two first relays switch their states asynchronously to avoid a short circuit state of the first circuit, wherein the first circuit includes the B phase, the two first relays, the sixth switch unit and the N line; or

[0075] The disconnected state of the sixth switch unit K6 is used to keep the second circuit in an open state when the two second relays switch their states asynchronously to avoid a short circuit state of the second circuit, wherein the second circuit includes the C phase, the two second relays, the sixth switch unit and the N line.

[0076] It can be seen that in this example, due to the disconnected state of the sixth switch unit K6, the two first relays can keep the first circuit in an open circuit state when the state switching is not synchronized to avoid the short-circuit state of the first circuit, and the two second relays can keep the second circuit in an open circuit state when the state switching is not synchronized to avoid the short-circuit state of the second circuit. This can improve the safety and stability of the circuit and avoid circuit failures caused by open circuits.

[0077] In a possible example, the disconnected state of the third switch unit K3 is used to overcome the first surge voltage generated by the rectifier circuit when the A phase is switched from a non-powered state to a powered state;

[0078] The disconnected state of the fourth switch unit K4 is used to overcome the second surge voltage generated by the rectifier circuit when the B phase is switched from a non-powered state to a powered state;

[0079] The disconnected state of the fifth switch unit K5 is used to overcome the third surge voltage generated by the rectifier circuit when the C phase is switched from a non-powered state to a powered state.

[0080] It can be seen that in this example, since the disconnected state of the third switch unit K3, the fourth switch unit K4, and the fifth switch unit K5 can overcome the surge voltage of the corresponding phase line, it is beneficial to improve the safety and stability of the circuit during the power supply mode switching process and reduce the probability of circuit failure due to surge voltage.

[0081] In a possible example, the rectifier circuit 120 includes a first rectifier bridge arm corresponding to the A, a second rectifier bridge arm corresponding to the B, and a third rectifier bridge arm corresponding to the C;

[0082] The first switch unit K1 is used to switch the bridge arm of the second rectifier bridge in the rectifier circuit 120 to the N line, so that the rectifier circuit 120 can control the transmission power in the AN single-phase power supply mode or the CN single-phase power supply mode;

[0083] The second switch unit K2 is used to switch the rectifier circuit 120 and the third rectifier bridge arm to the N line, so that the rectifier circuit 120 can control the transmission power in the AN single-phase power supply mode or the BN single-phase power supply mode.

[0084] It can be seen that in this example, the switching capability of the first switch unit K1 and the second switch unit K2 for each phase of the rectifier bridge enables any one of the AN single-phase power supply mode, BN single-phase power supply mode, and CN single-phase power supply mode to control the transmission power, which is beneficial to improving the success rate and stability of the circuit power control.

[0085] In a possible example, if the input mode adjustable circuit is in a three-phase power supply mode, the first port K11 of the first switch unit K1 is connected and the second port K12 is disconnected, the first port K21 of the second switch unit K2 is connected and the second port K22 is disconnected, the third switch unit K3, the fourth switch unit K4, and the fifth switch unit K5 are all connected, and the sixth switch unit K6 is disconnected.

[0086] In the specific implementation, the control circuit 160 specifically implements the control of the states of the first port K11 of the first switch unit K1, the second port K12 of the first switch unit K1, the first port K21 of the second switch unit K2, the second port K22 of the second switch unit K2, the third switch unit K3, the fourth switch unit K4, the fifth switch unit K5, and the sixth switch unit K6.

[0087] It can be seen that in this example, by controlling the state of the relevant switch unit in the input mode switching circuit 100, the control of the electrical circuit state required by the three-phase AC power supply in the three-phase power supply mode can be achieved, thereby improving the feasibility of switching the three-phase power supply mode.

[0088] In a possible example, if the input mode adjustable circuit 10 is in the AB two-phase power supply mode, the first port K11 of the first switch unit K1 is turned on and the second port K12 is turned off, the third switch unit K3 and the fourth switch unit K4 are turned on, and the fifth switch unit K5 and the sixth switch unit K6 are turned off; wherein the action state of the second switch unit K2 is not limited in the AB phase power supply mode, because the fifth switch unit K5 is in the off state;

[0089] If the input mode adjustable circuit 10 is in the AC two-phase power supply mode, the first port K21 of the second switch unit K2 is connected and the second port K22 is disconnected, the third switch unit K3 and the fifth switch unit K5 are connected, and the fourth switch unit K4 and the sixth switch unit K6 are disconnected; wherein, in this mode, the action state of the first switch unit K1 is not limited, because the fifth switch unit K5 is in the disconnected state;

[0090] If the input mode adjustable circuit 10 is in the BC two-phase power supply mode, the first port K11 of the first switch unit K1 is connected and the second port K12 of the first switch unit K1 is disconnected, the first port K21 of the second switch unit K2 is connected and the second port K22 of the second switch unit K2 is disconnected, the fourth switch unit K4 and the fifth switch unit K5 are connected, and the third switch unit K3 and the sixth switch unit K6 are disconnected.

[0091] It can be seen that in this example, by controlling the state of the relevant switch unit in the input mode switching circuit 100, it is possible to control the electrical circuit state required by the three-phase AC power supply in any two-phase power supply mode of AB, AC, and BC, thereby improving the feasibility of switching the two-phase power supply mode.

[0092] In a possible example, if the input mode adjustable circuit 10 is in the AN single-phase power supply mode, the first port K11 of the first switch unit K1 is connected and the second port K12 is disconnected, the first port K21 of the second switch unit K2 is disconnected and the second port K22 is connected, the third switch unit K3, the fifth switch unit K5, and the sixth switch unit K6 are all connected, and the fourth switch unit K4 is disconnected; or, the first port K11 of the first switch unit K1 is disconnected and the second port K12 is connected, the first port K21 of the second switch unit K2 is connected and the second port K22 is disconnected, the third switch unit K3, the fourth switch unit K4, and the sixth switch unit K6 are all connected, and the fifth switch unit K5 is disconnected;

[0093] If the input mode adjustable circuit 10 is in the BN single-phase power supply mode, the first port K11 of the first switch unit K1 is turned on and the second port K12 is turned off, the first port K21 of the second switch unit K2 is turned off and the second port K22 is turned on, the fourth switch unit K4, the fifth switch unit K5, and the sixth switch unit K6 are all turned on, and the third switch unit K3 is turned off;

[0094] If the input mode adjustable circuit 10 is in the CN single-phase power supply mode, the first port K11 of the first switch unit K1 is disconnected and the second port K12 is connected, the first port K21 of the second switch unit K2 is connected and the second port K22 is disconnected, the fourth switch unit K4, the fifth switch unit K5, and the sixth switch unit K6 are all connected, and the third switch unit K3 is disconnected.

[0095] It can be seen that in this example, by controlling the state of the relevant switch units in the input mode switching circuit 100, it is possible to control the electrical circuit state required by the three-phase AC power supply in any one of the AN single-phase power supply mode, the BN single-phase power supply mode, and the CN single-phase power supply mode, thereby improving the feasibility of switching the single-phase power supply mode.

[0096] like Figure 8 As shown, the embodiment of the present application provides a flow chart of a power supply mode control method of the control circuit 160 applied to the aforementioned input mode adjustable circuit 10, and the method includes the following steps:

[0097] S810: A mode switching instruction is detected.

[0098] The power supply mode indicated by the mode switching instruction includes any one of the following: three-phase power supply mode, AB two-phase power supply mode, AC two-phase power supply mode, BC two-phase power supply mode, AN single-phase power supply mode, BN single-phase power supply mode, and CN single-phase power supply mode;

[0099] In a specific implementation, the mode switching instruction may be created by manual entry or in real time according to the circuit state, etc., and no limitation is made here.

[0100] S820, responding to the mode switching instruction, determining, according to the power supply mode indicated by the mode switching instruction, a first action state to which the first switch unit needs to be adjusted, a second action state to which the second switch unit needs to be adjusted, a third action state to which the third switch unit needs to be adjusted, a fourth action state to which the fourth switch unit needs to be adjusted, a fifth action state to which the fifth switch unit needs to be adjusted, and a sixth action state to which the sixth switch unit needs to be adjusted;

[0101] Wherein, the circuit system can selectively control the three-phase AC power supply to shut down first; and,

[0102] In a specific implementation, the shutdown action can be executed by the control circuit directly controlling the switch device or can be executed indirectly by the control circuit notifying other control circuits.

[0103] S830, adjusting the third switch unit to the third action state, the fourth switch unit to the fourth action state, and the fifth switch unit to the fifth action state;

[0104] as well as,

[0105] S840, controlling the sixth switch unit to be in an off state;

[0106] S850, controlling the first switch unit to be in the first action state, and controlling the second switch unit to be in the second action state;

[0107] S860, detecting whether the sixth action state of the sixth switch unit is the disconnected state;

[0108] S8601, if it is the disconnected state, controlling the three-phase AC power supply to supply power according to the power supply mode indicated by the mode switching instruction;

[0109] S8602: If it is not the disconnected state, control the sixth switch unit to the sixth action state, and control the three-phase AC power supply to supply power according to the power supply mode indicated by the mode switching instruction.

[0110] There is no restriction on the order of the actions of S840 and S850.

[0111] Among them, in the power supply mode indicated by the mode switching instruction, the first action state of the first switch unit K1, the second action state of the second switch unit K2, the third action state of the third switch unit K3, the fourth action state of the fourth switch unit K4, the fifth action state of the fifth switch unit K5, and the sixth action state of the sixth switch unit K6, refer to the states of the switch units in the above-mentioned power supply modes for details, which will not be repeated here.

[0112] It can be seen that in the embodiment of the present application, the input mode adjustable circuit 10 can dynamically and adaptively adjust the circuit state according to the mode switching instruction to achieve rapid switching of the power supply system, without the need for manual participation of maintenance personnel throughout the process, and due to the early disconnection of the sixth switch unit K6, the short-circuit scene caused by the asynchronous action of relays in the multi-relay parallel scenario can be effectively avoided, thereby improving the stability and safety of circuit switching control.

Claims

1. An input mode adjustable circuit, characterized in that: include: An input mode switching circuit includes a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a fifth switch unit and a sixth switch unit, The first port of the third switch unit is connected to phase A of the three-phase AC power supply; The first port of the first switch unit is connected to the B phase of the three-phase AC power supply, the second port of the first switch unit is connected to the first port of the sixth switch unit, and the third port of the first switch unit is connected to the first port of the fourth switch unit; The first port of the second switch unit is connected to the C phase of the three-phase AC power supply, the second port of the second switch unit is connected to the first port of the sixth switch unit, and the third port of the second switch unit is connected to the first port of the fifth switch unit; The second port of the sixth switch unit is connected to the N line of the three-phase AC power supply; A rectifier circuit, comprising a first input port, a second input port, a third input port, a first output port, and a second output port, wherein the first input port is connected to the second port of the third switch unit, the second input port is connected to the second port of the fourth switch unit, the third input port is connected to the second port of the fifth switch unit, the first output port is connected to the first port of a load circuit, the second output port is connected to the second port of the load circuit, and the rectifier circuit is a Vienna rectifier circuit; If the input mode adjustable circuit is in the three-phase power supply mode, the first port of the first switch unit is connected and the second port is disconnected, the first port of the second switch unit is connected and the second port is disconnected, the third switch unit, the fourth switch unit, and the fifth switch unit are all connected, and the sixth switch unit is disconnected; If the input mode adjustable circuit is in the AB two-phase power supply mode, the first port of the first switch unit is connected and the second port is disconnected, the third switch unit and the fourth switch unit are connected, and the fifth switch unit and the sixth switch unit are disconnected; If the input mode adjustable circuit is in the AC two-phase power supply mode, the first port of the second switch unit is turned on and the second port is turned off, the third switch unit and the fifth switch unit are turned on, and the fourth switch unit and the sixth switch unit are turned off; If the input mode adjustable circuit is in the BC two-phase power supply mode, the first port of the first switch unit is turned on and the second port is turned off, the first port of the second switch unit is turned on and the second port is turned off, the fourth switch unit and the fifth switch unit are turned on, and the third switch unit and the sixth switch unit are turned off; If the input mode adjustable circuit is in the AN single-phase power supply mode, the first port of the first switch unit is connected and the second port is disconnected, the first port of the second switch unit is disconnected and the second port is connected, the third switch unit, the fifth switch unit, and the sixth switch unit are all connected, and the fourth switch unit is disconnected; or, the first port of the first switch unit is disconnected and the second port is connected, the first port of the second switch unit is connected and the second port is disconnected, the third switch unit, the fourth switch unit, and the sixth switch unit are all connected, and the fifth switch unit is disconnected; If the input mode adjustable circuit is in the BN single-phase power supply mode, the first port of the first switch unit is connected and the second port is disconnected, the first port of the second switch unit is disconnected and the second port is connected, the fourth switch unit, the fifth switch unit, and the sixth switch unit are all connected, and the third switch unit is disconnected; If the input mode adjustable circuit is in the CN single-phase power supply mode, the first port of the first switch unit is disconnected and the second port is connected, the first port of the second switch unit is connected and the second port is disconnected, the fourth switch unit, the fifth switch unit, and the sixth switch unit are all connected, and the third switch unit is disconnected.

2. The circuit according to claim 1, characterized in that The input mode adjustable circuit further includes a control circuit, The plurality of control ports of the control circuit are connected to the control port of the first switch unit, the control port of the second switch unit, the control port of the third switch unit, the control port of the fourth switch unit, the control port of the fifth switch unit and the control port of the sixth switch unit; The control circuit is used to select the first port of the first switch unit or the second port of the first switch unit, and to select the first port of the second switch unit or the second port of the second switch unit; and to control the opening and closing of the third switch unit, the fourth switch unit, the fifth switch unit and the sixth switch unit.

3. The circuit according to claim 1 or 2, characterized in that: The first switch unit includes two first relays used in parallel, and the second switch unit includes two second relays used in parallel; The disconnected state of the sixth switch unit is used to keep the first circuit in an open circuit state when the two first relays switch their states asynchronously to avoid a short circuit state of the first circuit, wherein the first circuit includes the B phase, the two first relays, the sixth switch unit and the N line; or The disconnected state of the sixth switch unit is used to keep the second circuit in an open state when the two second relays switch their states asynchronously to avoid a short circuit state of the second circuit, wherein the second circuit includes the C phase, the two second relays, the sixth switch unit and the N line.

4. The circuit according to claim 1 or 2, characterized in that: The disconnected state of the third switch unit is used to overcome the first surge voltage generated by the rectifier circuit when the A phase is switched from a non-powered state to a powered state; The disconnected state of the fourth switch unit is used to overcome the second surge voltage generated by the rectifier circuit when the B phase is switched from a non-powered state to a powered state; The disconnected state of the fifth switch unit is used to overcome the third surge voltage generated by the rectifier circuit when the C phase is switched from a non-powered state to a powered state.

5. The circuit according to claim 1 or 2, characterized in that: The rectifier circuit comprises a first rectifier bridge arm corresponding to A, a second rectifier bridge arm corresponding to B, and a third rectifier bridge arm corresponding to C; The first switch unit is used to switch the rectifier circuit and the second rectifier bridge arm to the N line, so that the rectifier circuit can control the transmission power in the AN single-phase power supply mode or the CN single-phase power supply mode; The second switch unit is used to switch the rectifier circuit and the third rectifier bridge arm to the N line, so that the rectifier circuit can control the transmission power in the AN single-phase power supply mode or the BN single-phase power supply mode.

6. The circuit according to claim 1 or 2, characterized in that: The third switch unit, the fourth switch unit, the fifth switch unit, and the sixth switch unit are unidirectional switch units.

7. A power supply mode control method, characterized in that: Applied to the circuit according to any one of claims 1 to 6, the method comprises: A mode switching instruction is detected, where the power supply mode indicated by the mode switching instruction includes any one of the following: a three-phase power supply mode, an AB two-phase power supply mode, an AC two-phase power supply mode, a BC two-phase power supply mode, an AN single-phase power supply mode, a BN single-phase power supply mode, and a CN single-phase power supply mode; In response to the mode switching instruction, determining, according to the power supply mode indicated by the mode switching instruction, a first action state to which the first switch unit needs to be adjusted, a second action state to which the second switch unit needs to be adjusted, a third action state to which the third switch unit needs to be adjusted, a fourth action state to which the fourth switch unit needs to be adjusted, a fifth action state to which the fifth switch unit needs to be adjusted, and a sixth action state to which the sixth switch unit needs to be adjusted; adjusting the third switch unit to the third action state, the fourth switch unit to the fourth action state, and the fifth switch unit to the fifth action state; and, Controlling the sixth switch unit to be in an off state; Controlling the first switch unit to the first action state, and controlling the second switch unit to the second action state; detecting whether the sixth action state of the sixth switch unit is the disconnected state; If it is the disconnected state, controlling the three-phase AC power supply to supply power according to the power supply mode indicated by the mode switching instruction; If it is not the disconnected state, the sixth switch unit is controlled to be in the sixth action state, and the three-phase AC power supply is controlled to supply power according to the power supply mode indicated by the mode switching instruction.

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