Reverse connection detection switching circuit and energy storage power supply

Abstract

The present application relates to a reverse connection detection switching circuit and an energy storage power supply. The reverse connection detection switching circuit includes: a reverse connection detection module, which is used to output a first signal when detecting that there is no alternating current at the neutral line input end, and output a second signal when detecting that there is alternating current at the neutral line input end; a switching control module, which is used to control the live line input end to be connected to the live line connection end of the bidirectional inverter and the neutral line input end to be connected to the neutral line connection end of the bidirectional inverter through the first signal; and to control the live line input end to be connected to the neutral line connection end of the bidirectional inverter and the neutral line input end to be connected to the live line connection end of the bidirectional inverter through the second signal.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage power supplies, and in particular to a reverse connection detection switching circuit and an energy storage power supply. Background Art

[0002] As one of the new energy products, energy storage power supplies are in increasing demand. Consumers are not too concerned about whether the live (L) and neutral (N) wires of the alternating current (AC) input of the energy storage power supply are connected in reverse, because even if the L and N wires are connected in reverse, it will not affect the grid-connected charging of the energy storage power supply, nor will it affect the use of the energy storage power supply with load equipment in bypass mode. However, there are safety hazards in the case of reverse connection of the L and N wires. In the case of reverse connection of the L and N wires, in the bypass mode with load equipment, and the load equipment has leakage protection, since the leakage switch controls the L line, even if the leakage switch controls the N line to disconnect after the reverse connection, the L line is actually always on, so the load equipment will not be protected, and there will be a problem that the load equipment cannot work normally due to the leakage protection being triggered all the time. In addition, if the load equipment has a metal shell and is connected to the N line, if the human body touches the shell, there will be a safety problem of electric shock. Summary of the invention

[0003] Based on this, it is necessary to provide a reverse connection detection switching circuit and energy storage power supply to avoid the safety problem of electric shock to human body in case the L and N lines are connected reversely to solve the above technical problems.

[0004] In a first aspect, the present application provides a reverse connection detection switching circuit, comprising:

[0005] A reverse connection detection module, configured to output a first signal when detecting that there is no alternating current at the neutral line input terminal, and output a second signal when detecting that there is alternating current at the neutral line input terminal;

[0006] A switching control module is used to control the live wire input terminal to be connected to the live wire connection terminal of the bidirectional inverter, and to control the neutral wire input terminal to be connected to the neutral wire connection terminal of the bidirectional inverter through the first signal; and to control the live wire input terminal to be connected to the neutral wire connection terminal of the bidirectional inverter, and to control the neutral wire input terminal to be connected to the live wire connection terminal of the bidirectional inverter through the second signal.

[0007] In one embodiment, the reverse connection detection module includes:

[0008] an electromagnetic induction unit, configured to not output an induced voltage when detecting that there is no alternating current at the neutral line input terminal, and to output the induced voltage when detecting that there is alternating current at the neutral line input terminal;

[0009] The switch unit is configured to be turned on under the control of the induced voltage to output the second signal when the induced voltage is received, and to be turned off to output the first signal when the induced voltage is not received.

[0010] In one embodiment, the electromagnetic induction unit comprises:

[0011] An induction coil connected to the switch unit, wherein the distance between the induction coil and the neutral line input terminal is less than a first preset distance, and the distance between the induction coil and the live line input terminal is greater than or equal to a second preset distance, and the second preset distance is greater than the first preset distance.

[0012] In one embodiment, the switch unit comprises:

[0013] A fourth switch tube and a fifth switch tube, wherein the control end of the fourth switch tube is connected to the induction coil, the first end of the fourth switch tube is connected to the first end of the fifth switch tube and the switching control module, the second end of the fourth switch tube is connected to the control end of the fifth switch tube, and the second end of the fifth switch tube is grounded.

[0014] In one embodiment, the switching control module is specifically used to control the live wire input terminal to be directly connected to the live wire connection terminal of the bidirectional inverter, and to control the neutral wire input terminal to be directly connected to the neutral wire connection terminal of the bidirectional inverter through the first signal; and to control the live wire input terminal to be connected to the neutral wire connection terminal of the bidirectional inverter with a delay of a preset time length, and to control the neutral wire input terminal to be connected to the live wire connection terminal of the bidirectional inverter with a delay of the preset time length through the second signal.

[0015] In one embodiment, the switching control module includes:

[0016] a first control unit, configured to control the neutral connection end of the bidirectional inverter to be connected to the first output end of the second control unit, and control the live connection end of the bidirectional inverter to be connected to the second output end of the second control unit, through the first signal; and control the neutral connection end of the bidirectional inverter to be connected to the second output end of the second control unit, and control the live connection end of the bidirectional inverter to be connected to the first output end of the second control unit, through the second signal;

[0017] The second control unit is used to control the neutral line input terminal to be directly connected to the first output terminal of the second control unit, and to control the live line input terminal to be directly connected to the second output terminal of the second control unit through the first signal; and to control the neutral line input terminal to be connected to the first output terminal of the second control unit with a delay of the preset time length, and to control the live line input terminal to be connected to the second output terminal of the second control unit with a delay of the preset time length through the second signal.

[0018] In one embodiment, the first control unit includes: a first relay and a first sub-control unit, wherein the first coil of the first relay is connected to the first sub-control unit;

[0019] the first sub-control unit is configured to supply power to the first coil via the second signal, and stop supplying power to the first coil via the first signal;

[0020] The first relay is used to control the neutral line connection end of the bidirectional inverter to be connected to the first output end of the second control unit, and to control the live line connection end of the bidirectional inverter to be connected to the second output end of the second control unit when the first coil stops supplying power; when the first coil is supplying power, control the neutral line connection end of the bidirectional inverter to be connected to the second output end of the second control unit, and to control the live line connection end of the bidirectional inverter to be connected to the first output end of the second control unit.

[0021] In one embodiment, the second control unit includes: a second relay, a second sub-control unit and a delay sub-unit, and the second coil of the second relay is connected to the second sub-control unit;

[0022] The delay sub-unit is used to control the second sub-control unit after delaying the preset time length to supply power to the second coil when the second signal is received; and directly control the second sub-control unit to supply power to the second coil when the first signal is received;

[0023] The second relay is used to control the neutral line input end to be connected to the first output end of the second control unit, and control the live line input end to be connected to the second output end of the second control unit when the second coil is powered;

[0024] Among them, the preset duration is greater than the target duration, and the target duration is the duration taken by the first control unit to control the neutral wire connection end of the bidirectional inverter to be connected to the second output end of the second control unit and to control the live wire connection end of the bidirectional inverter to be connected to the first output end of the second control unit through the second signal.

[0025] In one of the embodiments, the delay subunit includes: a seventh resistor, a voltage regulator tube, a second capacitor and a second diode;

[0026] One end of the seventh resistor is connected to the first control unit, the other end of the seventh resistor is connected to the cathode of the voltage regulator and the second capacitor, the anode of the voltage regulator is connected to the anode of the second diode, and the cathode of the second diode is connected to the second sub-control unit.

[0027] In a second aspect, the present application further provides an energy storage power supply, comprising: a bidirectional inverter, and a reverse connection detection switching circuit as described in the first aspect or any embodiment thereof.

[0028] The above-mentioned reverse connection detection switching circuit includes: a reverse connection detection module, which is used to output a first signal when it is detected that there is no alternating current at the neutral line input end, and output a second signal when it is detected that there is alternating current at the neutral line input end; a switching control module, which is used to control the live line input end to be connected to the live line connection end of the bidirectional inverter, and to control the neutral line input end to be connected to the neutral line connection end of the bidirectional inverter through the first signal; and to control the live line input end to be connected to the neutral line connection end of the bidirectional inverter, and to control the neutral line input end to be connected to the live line connection end of the bidirectional inverter through the second signal. Through this solution, the reverse connection detection module can detect whether there is alternating current at the neutral line input end. When there is no alternating current, it means that the L and N lines are not connected reversely at this time. At this time, the neutral line input end is controlled to be connected to the neutral line connection end of the bidirectional inverter through the first signal, and the live line input end is controlled to be connected to the live line connection end of the bidirectional inverter; when there is alternating current, it means that the L and N lines are connected reversely at this time. At this time, the live line input end is controlled to be connected to the neutral line connection end of the bidirectional inverter through the second signal, and the neutral line input end is controlled to be connected to the live line connection end of the bidirectional inverter, so that in the case of the L and N lines being connected reversely, it can be switched to L line to L line, N line to N line, thereby improving safety and reliability and avoiding human electric shock safety issues. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 is a structural schematic diagram of a reverse connection detection switching circuit 10;

[0031] Figure 2 A schematic diagram of the structure of an energy storage power supply Figure 1 ;

[0032] Figure 3 A schematic diagram of the structure of an energy storage power supply Figure 2 ;

[0033] Figure 4 A schematic diagram of the structure of an energy storage power supply Figure 3 ;

[0034] Figure 5 A schematic diagram of the structure of an energy storage power supply Figure 4 ;

[0035] Figure 6 A schematic diagram of the structure of an energy storage power supply Figure 5 . DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] New energy will become an important direction for future development. As one of the new energy products, energy storage power supply is in increasing demand. Consumers are not too concerned about whether the L and N lines of the AC input inside the energy storage power supply are connected in reverse, because even if the L and N lines are connected in reverse, it will not affect the grid-connected charging of the energy storage power supply, nor will it affect the use of the energy storage power supply with load equipment in bypass mode.

[0038] However, there are safety hazards in the case where the L and N lines are connected in reverse. In the case where the L and N lines are connected in reverse, in bypass mode with load equipment, and the load equipment has leakage protection, since the leakage switch controls the L line, even if the leakage switch controls the N line to be disconnected after the reverse connection, the L line is actually always on, so the load equipment will not be protected, and there will be a problem that the load equipment cannot work normally due to the leakage protection being triggered all the time. In addition, if the load equipment has a metal shell and is connected to the N line, if the human body touches the shell, there will be a safety problem of electric shock to the human body.

[0039] In order to solve the above problems, the embodiments of the present application provide a reverse connection detection switching circuit and an energy storage power supply. By applying the circuit of the embodiments of the present application, the AC input L and N lines inside the energy storage power supply can be switched to L line to L line and N line to N line when the L and N lines are connected reversely. This can not only improve the safety and reliability of the energy storage product, but also provide safety protection for the user and the load equipment used, thereby effectively solving the problems of load equipment not being able to work normally due to leakage current and electric shock to human body.

[0040] Figure 1FIG. 1 is a schematic diagram of a reverse connection detection switching circuit 10. Figure 1 As shown, the circuit includes:

[0041] The reverse connection detection module 11 is used to output a first signal when it is detected that there is no alternating current at the neutral line input terminal, and to output a second signal when it is detected that there is alternating current at the neutral line input terminal;

[0042] The switching control module 12 is used to control the live wire input terminal to be connected to the live wire connection terminal of the bidirectional inverter, and to control the neutral wire input terminal to be connected to the neutral wire connection terminal of the bidirectional inverter through a first signal; and to control the live wire input terminal to be connected to the neutral wire connection terminal of the bidirectional inverter, and to control the neutral wire input terminal to be connected to the live wire connection terminal of the bidirectional inverter through a second signal.

[0043] The above-mentioned reverse connection detection switching circuit in the embodiment of the present application can be connected to the live wire input end of the energy storage power supply, or between the live wire input end and the connection end of the bidirectional inverter.

[0044] In the embodiment of the present application, the above-mentioned neutral line input terminal may be a terminal connected to the neutral line of the mains, and the above-mentioned live line input terminal may be a terminal connected to the live line of the mains.

[0045] Figure 2 A schematic diagram of the structure of an energy storage power supply Figure 1 The energy storage power supply includes the above Figure 1 The reverse connection detection switching circuit 10 shown in FIG. 1 includes a reverse connection detection module 11 and a switching control module 12, and also includes a bidirectional inverter 14. For example, Figure 2 As shown in , the distance between the reverse connection detection module 11 and the neutral line input terminal GIRD-N is within a certain range, so that the reverse connection detection module 11 can detect whether there is AC power at the neutral line input terminal GIRD-N. Figure 2 As shown in the figure, the reverse connection detection module 11 is connected to the switching control module 12, the switching control module 12 is connected to the neutral line input terminal GIRD-N and the live line input terminal GIRD-L, and the switching control module 12 is connected to the neutral line connection terminal ACIN-N and the live line connection terminal ACIN-L of the bidirectional inverter 14.

[0046] Figure 2 In the embodiment, when the reverse connection detection module 11 detects that there is no alternating current at the neutral line input terminal GIRD-N, it indicates that there is no problem of reverse connection between the neutral line and the live line. At this time, the first signal is output so that the switching control module 12 controls the live line input terminal GIRD-L to be connected to the live line connection terminal ACIN-L of the bidirectional inverter 14, and controls the neutral line input terminal GIRD-N to be connected to the neutral line connection terminal ACIN-N of the bidirectional inverter 14 through the first signal.

[0047] Figure 2In the embodiment, when it is detected that there is alternating current at the neutral line input terminal GIRD-N, it indicates that there is a problem of reverse connection between the neutral line and the live line. At this time, a second signal is output so that the switching control module 12 controls the live line input terminal GIRD-L to be connected to the neutral line connection terminal ACIN-N of the bidirectional inverter 14, and controls the neutral line input terminal GIRD-N to be connected to the live line connection terminal ACIN-L of the bidirectional inverter 14 through the second signal.

[0048] In the above-mentioned reverse connection detection switching circuit and energy storage power supply, the reverse connection detection module can detect whether there is alternating current at the neutral line input end. When there is no alternating current, it means that the L and N lines are not connected reversely at this time. At this time, the neutral line input end is controlled to be connected to the neutral line connection end of the bidirectional inverter through the first signal, and the live line input end is controlled to be connected to the live line connection end of the bidirectional inverter; when there is alternating current, it means that the L and N lines are connected reversely at this time. At this time, the live line input end is controlled to be connected to the neutral line connection end of the bidirectional inverter through the second signal, and the neutral line input end is controlled to be connected to the live line connection end of the bidirectional inverter, so that in the case of reverse connection of the L and N lines, it can be switched to L line to L line, N line to N line, so that safety and reliability can be improved and human electric shock safety problems can be avoided.

[0049] Combination Figure 2 ,like Figure 3 The figure shows a schematic diagram of the structure of an energy storage power supply. Figure 2 . Figure 3 The reverse connection detection module 11 may include an electromagnetic induction unit and a switch unit:

[0050] The electromagnetic induction unit is used for not outputting an induced voltage when it is detected that no alternating current is present at the neutral line input terminal GIRD-N, and for outputting an induced voltage when it is detected that alternating current is present at the neutral line input terminal GIRD-N; the switch unit is used for being turned on under the control of the induced voltage when the induced voltage is received to output a second signal, and being turned off when the induced voltage is not received to output a first signal.

[0051] In some embodiments, Figure 3 As shown, the electromagnetic induction unit may include: an induction coil G connected to the switch unit, the distance between the induction coil G and the neutral line input terminal GIRD-N is less than a first preset distance, the distance between the induction coil G and the live line input terminal GIRD-L is greater than or equal to a second preset distance, and the second preset distance is greater than the first preset distance.

[0052] Exemplarily, the first preset distance and the second preset distance may be set according to the sensing range of the induction coil G, wherein the first preset distance needs to be within the sensing range, and the second preset distance may be outside the sensing range.

[0053] It should be noted that the first preset distance and the second preset distance can be set according to actual needs, and the specific values ​​of the settings are not limited in the embodiments of the present application.

[0054] Figure 3 In the embodiment, the induction coil G needs to be placed close to the neutral line input terminal GIRD-N to ensure that it can sensitively sense whether there is AC power on the neutral line input terminal GIRD-N, and the induction coil G must be placed away from the live line input terminal GIRD-L to avoid misdetection of the live line input terminal GIRD-L.

[0055] In some embodiments, Figure 3 As shown, the switch unit includes: a fourth switch tube Q4 and a fifth switch tube Q5, the control end of the fourth switch tube Q4 is connected to the induction coil G, the first end of the fourth switch tube Q4 is connected to the first end of the fifth switch tube Q5 and the switching control module 12, the second end of the fourth switch tube Q4 is connected to the control end of the fifth switch tube Q5, and the second end of the fifth switch tube Q5 is grounded GND.

[0056] Among them, the fourth switch tube Q4 and the fifth switch tube Q5 are Darlington tubes. Because when the L and N lines are connected reversely, the current of the alternating current induced by the induction coil G is very weak, and its sensitivity must be adjusted through multi-stage amplification. If the induction sensitivity needs to be increased or decreased, the amplification level can be adjusted by increasing or decreasing the Darlington tubes.

[0057] It should be noted that the above-mentioned increase or decrease of Darlington tubes refers to increase or decrease in the number of Darlington tubes. Among them, Darlington tubes have the function of amplifying current, and when the number of Darlington tubes is increased, the effect of multi-stage amplification will be enhanced, thereby improving the amplification ability of weak current, that is, increasing the inductive sensitivity. Conversely, when the number of Darlington tubes is reduced, the effect of multi-stage amplification will be weakened, and the amplification ability of weak current will be reduced, that is, reducing the inductive sensitivity.

[0058] Above Figure 3 The two Darlington tubes including the fourth switch tube Q4 and the fifth switch tube Q5 in the middle switch unit are only an exemplary description. In practice, the specific number of Darlington tubes can be set according to the required sensing sensitivity, which is not limited in the embodiment of the present application.

[0059] In some embodiments, Figure 3 As shown, Figure 3 The reverse connection detection module 11 may further include a fifth resistor R5 and a first capacitor C1.

[0060] Above Figure 3The reverse connection detection module 11 shown in the figure can sense whether there is alternating current on the live wire GIRD-L through the induction coil G. When the presence of alternating current is sensed, an induction voltage is output to control the fourth switch tube Q4 and the fifth switch tube Q5 to be turned on to output a second signal. When the presence of alternating current is not sensed, an induction voltage is not output. When the presence of alternating current is sensed, an induction voltage is output to control the fourth switch tube Q4 and the fifth switch tube Q5 to be turned off to output a first signal.

[0061] Above Figure 3 The switching control module 12 is specifically used to control the live wire input terminal to be directly connected to the live wire connection terminal of the bidirectional inverter, and to control the neutral wire input terminal to be directly connected to the neutral wire connection terminal of the bidirectional inverter through a first signal; and to control the live wire input terminal to be connected to the neutral wire connection terminal of the bidirectional inverter with a delay of a preset time length, and to control the neutral wire input terminal to be connected to the live wire connection terminal of the bidirectional inverter with a delay of a preset time length through a second signal.

[0062] Combination Figure 3 ,like Figure 4 The figure shows a schematic diagram of the structure of an energy storage power supply. Figure 2 . Figure 4 The switching control module 12 includes: a first control unit 401 and a second control unit 402.

[0063] The first control unit 401 is used to control the neutral line connection terminal ACIN-N of the bidirectional inverter 14 to be connected to the first output terminal of the second control unit 402, and to control the live line connection terminal ACIN-L of the bidirectional inverter 14 to be connected to the second output terminal of the second control unit 402 through a first signal; and to control the neutral line connection terminal ACIN-N of the bidirectional inverter 14 to be connected to the second output terminal of the second control unit 402, and to control the live line connection terminal ACIN-L of the bidirectional inverter 14 to be connected to the first output terminal of the second control unit 402 through a second signal.

[0064] The second control unit 402 is used to control the neutral line input terminal GIRD-N to be directly connected to the first output terminal of the second control unit 402, and to control the live line input terminal GIRD-L to be directly connected to the second output terminal of the second control unit 402 through a first signal; and to control the neutral line input terminal GIRD-N to be connected to the first output terminal of the second control unit 402 with a delay of the preset time length, and to control the live line input terminal GIRD-L to be connected to the first output terminal of the second control unit 402 with a delay of the preset time length through the second signal.

[0065] In some embodiments, Figure 4 As shown, the first control unit 401 includes: a first relay RLY1 and a first sub-control unit 4012 , and the first coil of the first relay RLY1 is connected to the first sub-control unit 4012 .

[0066] Among them, the first sub-control unit 4012 is used to supply power to the first coil through the second signal, and to stop supplying power to the first coil through the first signal; the first relay RLY1 is used to control the neutral line connection terminal ACIN-N of the bidirectional inverter 14 to connect to the first output terminal of the second control unit 402, and to control the live line connection terminal ACIN-L of the bidirectional inverter 14 to connect to the second output terminal of the second control unit 402 when the first coil stops supplying power; when the first coil is powered, the neutral line connection terminal ACIN-N of the bidirectional inverter 14 is controlled to connect to the second output terminal of the second control unit 402, and the live line connection terminal ACIN-L of the bidirectional inverter 14 is controlled to connect to the first output terminal of the second control unit 402.

[0067] In some embodiments, Figure 4 As shown, the second control unit 402 includes: a second relay RLY2, a second sub-control unit 4022 and a delay sub-unit 4023, the second coil of the second relay RLY2 is connected to the second sub-control unit 4022; the delay sub-unit 4023 is used to control the second sub-control unit 4022 after delaying for a preset time when receiving the second signal, and to power the second coil; when receiving the first signal, directly control the second sub-control unit 4022 to power the second coil; the second relay is used to control the neutral line input terminal GIRD-N to connect to the first output terminal of the second control unit 402, and control the live line input terminal GIRD-L to connect to the second output terminal of the second control unit 402 when the second coil is powered;

[0068] The preset duration is greater than the target duration. The target duration is the duration that the first control unit 401 controls the neutral connection terminal ACIN-N of the bidirectional inverter 14 to connect to the second output terminal of the second control unit 402 and controls the live connection terminal ACIN-L of the bidirectional inverter 14 to connect to the first output terminal of the second control unit 402 through the second signal.

[0069] The first coil and the second coil are important components of the first relay and the second relay, respectively. The coil in the relay can be wound by enameled wire, and its function is to generate a magnetic field when a current passes through it. From the working principle, when a certain voltage or current is applied to the coil, a magnetic field will be formed around the coil according to the law of electromagnetic induction. This magnetic field will act on the iron core or other magnetic components inside the relay, thereby causing the contacts of the relay to move and realize the on-off control of the circuit.

[0070] Above Figure 4As shown in the figure, the first control unit 401 can control the neutral line connection terminal ACIN-N of the bidirectional inverter 14 to connect to the second output terminal of the second control unit 402, and control the live line connection terminal ACIN-L of the bidirectional inverter 14 to connect to the first output terminal of the second control unit 402 through the second signal; the second control unit 402 is used to control the neutral line input terminal GIRD-N to connect to the first output terminal of the second control unit 402 with a delay of the preset time length, and control the live line input terminal GIRD-L to connect to the second output terminal of the second control unit 402 with a delay of the preset time length through the second signal. In this way, it can be achieved that within the preset time length, the first control unit 401 first controls the neutral line connection terminal ACIN-N of the bidirectional inverter 14 to connect to the second output terminal of the second control unit 402, and controls the live line connection terminal ACIN-L of the bidirectional inverter 14 to connect to the first output terminal of the second control unit 402 through the second signal, so as to avoid the situation that the L and N lines are connected in reverse within the preset time length, so as to improve safety and reliability and avoid the safety problem of electric shock to human body.

[0071] Exemplary, combined Figure 4 ,like Figure 5 The figure shows a schematic diagram of the structure of an energy storage power supply. Figure 3 ,like Figure 5 As shown above Figure 4 The first sub-control unit 4012 includes: a first resistor R1, a second resistor R2, a fourth resistor R4, an eighth resistor R8, a second switch tube Q2, and a third switch tube Q3;

[0072] Among them, one end of the first resistor R1 is connected to one end of the first coil, the other end of the first resistor R1 is connected to the first end of the third switch tube Q3, the control end of the third switch tube Q3 is connected to the first end of the fourth resistor R4, one end of the eighth resistor R8 and the control end of the second switch tube Q2, and the second end of the third switch tube Q3 is grounded; the other end of the fourth resistor R4 is connected to the power supply connection end VCC and one end of the second resistor R2, the other end of the second resistor R2 is connected to the first end of the second switch tube Q2, and the second end of the second switch tube Q2 is grounded; the other end of the eighth resistor R8 is connected to the second control unit 402 and the reverse connection detection module 11.

[0073] For example, Figure 5 As shown above Figure 4 The second sub-control unit 4022 may include: a first switch tube Q1, a third resistor R3, a sixth resistor R6, and a first diode D1.

[0074] Among them, one end of the third resistor R3 is connected to one end of the second coil, the other end of the second coil is connected to the power connection end VCC, the other end of the third resistor R3 is connected to the first end of the first switch tube Q1, the control end of the first switch tube Q1 is connected to the cathode of the first diode D1 and one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the second end of the first switch tube Q1 and the ground end GND, and the anode of the first diode D1 is connected to the first control unit 401 and the reverse connection detection module 11.

[0075] like Figure 5 As shown in , when the L and N lines are not connected reversely, GIRD-N is actually connected to the N line, and the induction coil is close to the actual N line. Since the N line has a voltage fluctuation of 0 to the ground, its voltage will not fluctuate, that is, there is no alternating electromagnetic field, and the induction coil has no induced current entering the b pole (i.e., the control end) of the fourth switch tube Q4, the fourth switch tube Q4 is turned off, and the fifth switch tube Q5 is also turned off. Figure 5 If point A in the circuit is not pulled to the ground, the b pole (i.e., the control end) and the e pole (i.e., the first end) of the second switch tube Q2 are at the same potential, and the b pole (i.e., the control end) and the e pole (i.e., the first end) of the third switch tube Q3 are at the same potential, the second switch tube Q2 and the third switch tube Q3 are turned off, the first relay RLY1 does not switch, and keeps pins 8 and 7, and pins 5 and 4 in contact. VCC controls the first switch tube Q1 to turn on through the loop of the fourth resistor R4, the eighth resistor R8 and the first diode D1, so that the second relay RLY2 is closed, and the energy storage power supply works normally.

[0076] Figure 5 The first relay RLY1 includes 8 pins, namely Figure 5 The second relay RLY2 has 6 pins, namely Figure 6 Pins 1, 2, 3, 4, 5 and 6 of RLY2.

[0077] like Figure 5 As shown in , when the L and N lines are connected in reverse, GIRD-N is the actual L line, the induction coil is close to the actual L line, and the L line is AC. The AC will form an alternating electromagnetic field in the induction coil, and then a very weak induced current will enter the b pole of the fourth switch tube Q4, and the fourth switch tube Q4 will be turned on. At this time, after amplification at the first stage, it will enter the b pole of the fifth switch tube Q5, and the fifth switch tube Q5 will also be turned on. The induced current of the induction coil is amplified by the second stage. Figure 5Point A in the circuit is pulled to the ground, the fourth resistor R4 and the eighth resistor R8 divide the VCC voltage, the e-pole voltage of the second switch tube Q2 and the third switch tube Q3 is higher than the b-pole voltage, the second switch tube Q2 and the third switch tube Q3 are turned on, and the first relay RLY1 is switched to make pin 8 contact with pin 6, and pin 5 contact with pin 3. In this way, when the L and N lines are connected reversely, they can be switched to L line to L line, and N line to N line, which can improve safety and reliability and avoid human electric shock safety problems.

[0078] Combination Figure 4 and Figure 5 ,like Figure 6 The figure shows a schematic diagram of the structure of an energy storage power supply. Figure 3 .like Figure 6 As shown above Figure 4 The delay subunit 4023 in the first control unit includes: a seventh resistor R7, a voltage regulator ZD1, a second capacitor C2 and a second diode D2; one end of the seventh resistor R7 is connected to the first sub-control unit in the first control unit (specifically, it can be connected to Figure 6 The other end of the seventh resistor R7 is connected to the cathode of the voltage regulator tube ZD1 and the second capacitor C2, the anode of the voltage regulator tube ZD1 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the second sub-control unit (specifically, it can be connected to Figure 6 R6 and D1 in the circuit).

[0079] like Figure 6 As shown, when the L and N lines are connected in reverse, VCC charges the second capacitor C2 through the second resistor R2, the second switch tube Q2 and the seventh resistor R7. When the voltage of the second capacitor C2 is greater than the voltage value of the voltage regulator tube ZD1, the voltage regulator tube ZD1 is broken down, and the signal enters the b pole (i.e., the control end) of the first switch tube Q1 through the second diode D2, so that the first switch tube Q1 is turned on, and the second relay RLY2 is closed, completing the switching of the L and N lines. Thus, the L line is connected to the L line, and the N line is connected to the N line, and the energy storage power supply starts to work normally.

[0080] One end of the second capacitor C2 is connected to the seventh resistor R7, and the other end of the second capacitor C2 is grounded.

[0081] It should be noted that Figure 6The above-mentioned delay subunit 4023 is used to make the second relay RLY2 close only after the first relay RLY1 completes the switching when the L and N lines are connected reversely. Because the first relay RLY1 needs a certain time to complete the switching, if there is no delay, there will be a certain period of time when the reverse connection of the L and N lines enters the energy storage power supply, that is, due to the action of the induction coil G and the conduction of the third switch tube Q3, it takes a certain time, then the reverse LN line will be powered by the first relay RLY1, and then the first relay RLY1 will switch again. Under the condition of large current, on the one hand, the power-off restart phenomenon will occur, and on the other hand, the switching of the first relay RLY1 during the energization process will easily generate sparks, damaging the first relay RLY1. Therefore, the setting of the above-mentioned delay module can avoid the power-off restart phenomenon and avoid damage to the first relay RLY1.

[0082] In summary, when L and N are not connected reversely, the second relay RLY2 is closed normally. When L and N are connected reversely, the second relay RLY2 is closed with a delay, so that the energy storage power supply can achieve L line to L line and N line to N line from AC input to AC output.

[0083] An embodiment of the present application further provides an energy storage power supply, which may include a bidirectional inverter and a reverse connection detection switching circuit as in the above embodiment.

[0084] For example, the energy storage power supply in the embodiment of the present application can be as described above. Figures 2 to 6 Any one of the following is shown.

[0085] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A reverse connection detection switching circuit, characterized in that: include: A reverse connection detection module, configured to output a first signal when detecting that there is no alternating current at the neutral line input terminal, and output a second signal when detecting that there is alternating current at the neutral line input terminal; a first control unit, configured to control the neutral connection end of the bidirectional inverter to be connected to the first output end of the second control unit, and control the live connection end of the bidirectional inverter to be connected to the second output end of the second control unit, through the first signal; and control the neutral connection end of the bidirectional inverter to be connected to the second output end of the second control unit, and control the live connection end of the bidirectional inverter to be connected to the first output end of the second control unit, through the second signal; The second control unit is used to control the neutral line input terminal to be directly connected to the first output terminal of the second control unit, and to control the live line input terminal to be directly connected to the second output terminal of the second control unit through the first signal; and to control the neutral line input terminal to be connected to the first output terminal of the second control unit with a delay of a preset time length, and to control the live line input terminal to be connected to the second output terminal of the second control unit with a delay of the preset time length through the second signal; The reverse connection detection module comprises: an electromagnetic induction unit, configured to not output an induced voltage when detecting that there is no alternating current at the neutral line input terminal, and to output the induced voltage when detecting that there is alternating current at the neutral line input terminal; The switch unit is configured to be turned on under the control of the induced voltage to output the second signal when the induced voltage is received, and to be turned off to output the first signal when the induced voltage is not received.

2. The circuit according to claim 1, characterized in that The electromagnetic induction unit comprises: An induction coil connected to the switch unit, wherein the distance between the induction coil and the neutral line input terminal is less than a first preset distance, and the distance between the induction coil and the live line input terminal is greater than or equal to a second preset distance, and the second preset distance is greater than the first preset distance.

3. The circuit according to claim 1, characterized in that The switch unit comprises: A fourth switch tube and a fifth switch tube, wherein the control end of the fourth switch tube is connected to the induction coil in the electromagnetic induction unit, the first end of the fourth switch tube is connected to the first end of the fifth switch tube, the first control module and the second control module, the second end of the fourth switch tube is connected to the control end of the fifth switch tube, and the second end of the fifth switch tube is grounded.

4. The circuit according to claim 1, characterized in that The first control unit comprises: a first relay and a first sub-control unit, wherein a first coil of the first relay is connected to the first sub-control unit; the first sub-control unit is configured to supply power to the first coil via the second signal, and stop supplying power to the first coil via the first signal; The first relay is used to control the neutral line connection end of the bidirectional inverter to be connected to the first output end of the second control unit, and to control the live line connection end of the bidirectional inverter to be connected to the second output end of the second control unit when the first coil stops supplying power; when the first coil is supplying power, control the neutral line connection end of the bidirectional inverter to be connected to the second output end of the second control unit, and to control the live line connection end of the bidirectional inverter to be connected to the first output end of the second control unit.

5. The circuit according to claim 4, characterized in that The second control unit comprises: a second relay, a second sub-control unit and a delay sub-unit, and the second coil of the second relay is connected to the second sub-control unit; The delay sub-unit is used to control the second sub-control unit after delaying the preset time length to supply power to the second coil when the second signal is received; and directly control the second sub-control unit to supply power to the second coil when the first signal is received; The second relay is used to control the neutral line input end to be connected to the first output end of the second control unit, and control the live line input end to be connected to the second output end of the second control unit when the second coil is powered; Among them, the preset duration is greater than the target duration, and the target duration is the duration taken by the first control unit to control the neutral wire connection end of the bidirectional inverter to be connected to the second output end of the second control unit and to control the live wire connection end of the bidirectional inverter to be connected to the first output end of the second control unit through the second signal.

6. The circuit according to claim 5, characterized in that The delay sub-unit includes: a seventh resistor, a voltage regulator, a second capacitor and a second diode; one end of the seventh resistor is connected to the first sub-control unit in the first control unit, the other end of the seventh resistor is connected to the cathode of the voltage regulator and one end of the second capacitor, the other end of the second capacitor is grounded, the anode of the voltage regulator is connected to the anode of the second diode, and the cathode of the second diode is connected to the second sub-control unit.

7. An energy storage power supply, characterized in that: It comprises a bidirectional inverter and a reverse connection detection switching circuit as claimed in any one of claims 1 to 6.

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