Voltage protection circuit, power supply circuit and high-voltage electric box

Abstract

The embodiment of the invention discloses a voltage protection circuit, a power supply circuit and a high-voltage electric box, and belongs to the field of power supply protection. The voltage protection circuit comprises a first comparison sub-circuit, a second comparison sub-circuit, an OR gate sub-circuit and a circuit breaker. The output end of the first comparison sub-circuit is connected with the first input end of the OR gate sub-circuit, the output end of the second comparison sub-circuit is connected with the second input end of the OR gate sub-circuit, and the output ends of the OR gate sub-circuit and the circuit breaker are connected with the circuit breaker. The input end of the first comparison sub-circuit and the input end of the second comparison sub-circuit are both used for connecting a battery cluster to be protected; and the circuit breaker is used for disconnecting the battery cluster from the power supply output end under the condition that the output signal of the OR gate sub-circuit is the preset level signal. Voltage protection is carried out through a pure hardware voltage protection circuit, control software is not depended on, and power supply protection function failure caused by software crash or system faults is avoided.

Description

Technical Field

[0001] The present invention relates to the field of power protection, and more particularly to a voltage protection circuit, a power supply circuit and a high-voltage electric box. Background Art

[0002] With the rapid development of new energy technologies, battery clusters, as the core components of energy storage systems, are widely used in fields such as electric vehicles and energy storage power stations. The operating voltage range of battery clusters directly affects their safety and service life. When the total DC voltage of a battery cluster exceeds or falls below a set threshold, it may cause overcharging and over-discharging of the battery, and even lead to serious accidents such as fires.

[0003] Most of the existing battery cluster voltage protection solutions rely on software control. Although they can implement relatively complex protection logics, in the case of software crashes or system failures, the protection functions will fail, posing certain safety hazards. In addition, during the software control process, additional time is required to process data and generate control signals, resulting in slow response of the protection function and thus prone to protection function failures. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a voltage protection circuit, a power supply circuit and a high-voltage electric box, which are used to solve the problem that the voltage protection function of the power supply is prone to failure.

[0005] To achieve the above purpose, in a first aspect, the present application provides a voltage protection circuit, which includes a first comparison sub-circuit, a second comparison sub-circuit, an OR gate sub-circuit and a circuit breaker;

[0006] The output end of the first comparison sub-circuit is connected to the first input end of the OR gate sub-circuit, the output end of the second comparison sub-circuit is connected to the second input end of the OR gate sub-circuit, the output ends of the OR gate sub-circuit and the circuit breaker are connected to the circuit breaker, and the input ends of the first comparison sub-circuit and the second comparison sub-circuit are both used to connect to the battery cluster to be protected;

[0007] The first comparison sub-circuit is configured to output a preset level signal when the battery cluster is in an overvoltage state;

[0008] The second comparison sub-circuit is configured to output a preset level signal when the battery cluster is in an undervoltage state;

[0009] The circuit breaker is configured to disconnect the connection between the battery cluster and the power supply output end when the output signal of the OR gate sub-circuit is a preset level signal.

[0010] In the embodiments of the present application, the voltage protection circuit further includes a DC voltage isolation transmitter;

[0011] The input terminals of the first comparator sub - circuit and the second comparator sub - circuit are both used to connect to the output terminal of the DC voltage isolation transmitter, and the input terminal of the DC voltage isolation transmitter is used to connect to the battery cluster;

[0012] The DC voltage isolation transmitter is used to convert the output voltage of the battery cluster into a low voltage.

[0013] In an embodiment of the present application, the first comparator sub - circuit includes a first comparator and a first protection resistor;

[0014] The first input terminal of the first comparator is connected to the output terminal of the DC voltage isolation transmitter, and the output terminal of the first comparator is connected to the first input terminal of the OR gate sub - circuit;

[0015] One side of the first protection resistor is connected to the output terminal of the first comparator, the other side of the first protection resistor is used to connect to the control power supply, and the second input terminal of the first comparator is used to connect to the control power supply;

[0016] The first comparator is used to output a preset level signal when the output of the DC voltage isolation transmitter is lower than the first voltage.

[0017] In an embodiment of the present application, the first comparator sub - circuit further includes a first voltage - dividing resistor and a second voltage - dividing resistor;

[0018] One side of the first voltage - dividing resistor is grounded through the second voltage - dividing resistor, and the other side of the first voltage - dividing resistor is used to connect to the control power supply;

[0019] The second input terminal of the first comparator is connected to the node between the first voltage - dividing resistor and the second voltage - dividing resistor.

[0020] In an embodiment of the present application, the second comparator sub - circuit includes a second comparator and a second protection resistor;

[0021] The first input terminal of the second comparator is connected to the output terminal of the DC voltage isolation transmitter, and the output terminal of the second comparator is connected to the second input terminal of the OR gate sub - circuit;

[0022] One side of the second protection resistor is connected to the output terminal of the second comparator, the other side of the second protection resistor is used to connect to the control power supply, and the second input terminal of the second comparator is used to connect to the control power supply;

[0023] The second comparator is used to output a preset level signal when the output of the DC voltage isolation transmitter is lower than the second voltage, where the first voltage is greater than the second voltage.

[0024] In an embodiment of the present application, the first comparator sub - circuit further includes a third voltage - dividing resistor and a fourth voltage - dividing resistor;

[0025] One side of the third voltage-dividing resistor is grounded through the fourth voltage-dividing resistor, and the other side of the third voltage-dividing resistor is used to connect to a control power supply;

[0026] The second input terminal of the second comparator is connected to the node between the third voltage-dividing resistor and the fourth voltage-dividing resistor.

[0027] In an embodiment of the present application, the OR gate sub-circuit includes a first diode, a second diode, and a third protection resistor;

[0028] The anode of the first diode is connected to the output terminal of the first comparison sub-circuit, the second diode is connected to the output terminal of the second comparison sub-circuit, and the cathodes of the first diode and the second diode are both connected to the circuit breaker;

[0029] The cathodes of the first diode and the second diode are both grounded through the third protection resistor.

[0030] In an embodiment of the present application, the voltage protection circuit further includes a relay;

[0031] The cathodes of the first diode and the second diode are both connected to the circuit breaker through the relay;

[0032] The relay is used to drive the circuit breaker to disconnect when the input is a preset level signal.

[0033] In a second aspect, the present application provides a power supply circuit, including a battery cluster and the above-mentioned voltage protection circuit;

[0034] The output terminal of the battery cluster is connected to the voltage protection circuit;

[0035] The battery cluster is used for high-voltage power supply.

[0036] In a third aspect, the present application provides a high-voltage electrical box, including the above-mentioned power supply circuit;

[0037] The high-voltage electrical box is used for AC power supply.

[0038] The present application provides a voltage protection circuit, including a first comparison sub-circuit, a second comparison sub-circuit, an OR gate sub-circuit and a circuit breaker; the output end of the first comparison sub-circuit is connected to the first input end of the OR gate sub-circuit, the output end of the second comparison sub-circuit is connected to the second input end of the OR gate sub-circuit, the output ends of the OR gate sub-circuit and the circuit breaker are connected to the circuit breaker, and the input ends of the first comparison sub-circuit and the second comparison sub-circuit are both used to connect the battery cluster to be protected; the circuit breaker is used to disconnect the connection between the battery cluster and the power output end when the output signal of the OR gate sub-circuit is a preset level signal. Voltage protection is carried out through a pure hardware voltage protection circuit, which does not rely on a control software, avoiding the failure of the power protection function caused by software freezing or system failure. In addition, no additional circuit operation data needs to be detected and processed during the protection process, reducing the data processing amount, having a short response time, ensuring that the battery cluster can cut off the circuit in time when the voltage is abnormal, avoiding the failure of the power protection function, and further avoiding battery damage or safety accidents.

[0039] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings

[0040] The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification, and are used to explain the embodiments of the present invention together with the following specific implementation manners, but do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0041] Figure 1 The first structural schematic diagram of the voltage protection circuit provided by the embodiment of the present application is shown;

[0042] Figure 2 The second structural schematic diagram of the voltage protection circuit provided by the embodiment of the present application is shown;

[0043] Figure 3 The structural schematic diagram of the power supply circuit provided by the embodiment of the present application is shown.

[0044] Description of the Reference Numerals in the Drawings

[0045] 1000 - High-voltage electrical box; 100 - Voltage protection circuit, 200 - Power supply circuit; 110 - First comparison sub-circuit, 120 - Second comparison sub-circuit, 130 - OR gate sub-circuit, 140 - Circuit breaker, 150 - DC voltage isolation transmitter, 160 - Relay, 210 - Battery cluster; U1 - First comparator, U2 - Second comparator, D1 - First diode, D2 - Second diode, R11 - First protection resistor, R12 - Second protection resistor, R13 - Third protection resistor; R1 - First voltage-dividing resistor, R2 - Second voltage-dividing resistor, R3 - Third voltage-dividing resistor, R4 - Fourth voltage-dividing resistor. Detailed Description of the Invention

[0046] The following will describe in detail the specific implementation manners of the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0047] Generally, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0048] In the following, the terms "including", "having" and their cognates that can be used in various embodiments of the present invention are only intended to represent specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be construed as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or increasing the possibility of one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0049] In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0050] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as those defined in a general-use dictionary) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning unless clearly defined in the various embodiments of the present invention.

[0051] Please refer to Figure 1 , Figure 1 which shows a first structural schematic diagram of the voltage protection circuit provided by the embodiments of the present application.

[0052] The voltage protection circuit 100 in this embodiment includes a first comparison sub-circuit 110, a second comparison sub-circuit 120, an OR gate sub-circuit 130, and a circuit breaker 140;

[0053] The output terminal of the first comparator sub-circuit 110 is connected to the first input terminal of the OR gate sub-circuit 130, and the output terminal of the second comparator sub-circuit 120 is connected to the second input terminal of the OR gate sub-circuit 130. The output terminals of the OR gate sub-circuit 130 and the circuit breaker 140 are connected to the circuit breaker 140. The input terminals of the first comparator sub-circuit 110 and the second comparator sub-circuit 120 are both used to connect to the battery cluster 210 to be protected;

[0054] The first comparator sub-circuit 110 is configured to output a preset level signal when the battery cluster 210 is in an overvoltage state;

[0055] The second comparator sub-circuit 120 is configured to output a preset level signal when the battery cluster 210 is in an undervoltage state;

[0056] The circuit breaker 140 is configured to disconnect the connection between the battery cluster 210 and the power output terminal when the output signal of the OR gate sub-circuit 130 is a preset level signal.

[0057] For ease of understanding, in the embodiments of the present application, the battery cluster 210 is used for 1000V power supply. The input terminals of the first comparator sub-circuit 110 and the second comparator sub-circuit 120 are both used to connect to the battery cluster 210 to be protected.

[0058] The first comparator sub-circuit 110 is used to detect whether the battery cluster 210 is in an overvoltage state, and output a preset level signal when the battery cluster 210 is in an overvoltage state. The second comparator sub-circuit 120 is used to detect whether the battery cluster 210 is in an undervoltage state, and output a preset level signal when the battery cluster 210 is in an undervoltage state. The type of the preset level signal is set according to actual requirements and is not limited herein. For ease of understanding, in the embodiments of the present application, the preset level signal is a high-level signal. When the battery cluster 210 is not in an overvoltage state and an undervoltage state, both the first comparator sub-circuit 110 and the second comparator sub-circuit 120 output low-level signals.

[0059] The output terminal of the first comparator sub-circuit 110 is connected to the first input terminal of the OR gate sub-circuit 130, and the output terminal of the second comparator sub-circuit 120 is connected to the second input terminal of the OR gate sub-circuit 130. The OR gate sub-circuit 130 is used to perform a logical OR operation on the output signals of the first comparator sub-circuit 110 and the second comparator sub-circuit 120 and output a control signal. The output terminals of the OR gate sub-circuit 130 and the circuit breaker 140 are connected to the circuit breaker 140. The circuit breaker 140 controls the on-off according to the output signal of the OR gate sub-circuit 130, and disconnects the connection with the AC terminal when the OR gate sub-circuit 130 outputs a preset level signal.

[0060] Voltage protection is carried out through the pure hardware voltage protection circuit 100, which does not rely on the control software, avoiding the failure of the power protection function caused by software crashes or system failures. In addition, no additional circuit operation data needs to be detected and processed during the protection process, reducing the amount of data processing and having a short response time, ensuring that the battery cluster 210 can cut off the circuit in a timely manner when the voltage is abnormal, avoiding the failure of the power protection function, and further avoiding battery damage or safety accidents.

[0061] Please refer to Figure 2 , Figure 2 which shows the second structural schematic diagram of the voltage protection circuit provided by the embodiment of the present application.

[0062] In the embodiment of the present application, the voltage protection circuit 100 further includes a DC voltage isolation transmitter 150;

[0063] The input ends of the first comparison sub-circuit 110 and the second comparison sub-circuit 120 are both used to connect to the output end of the DC voltage isolation transmitter 150, and the input end of the DC voltage isolation transmitter 150 is used to connect to the battery cluster 210;

[0064] The DC voltage isolation transmitter 150 is used to convert the output voltage of the battery cluster 210 into a low voltage.

[0065] For ease of understanding, in the embodiment of the present application, the battery cluster 210 provides a DC voltage of up to 1000V. The input end of the DC voltage isolation transmitter 150 is used to connect to the battery cluster 210. The input ends of the first comparison sub-circuit 110 and the second comparison sub-circuit 120 are both used to connect to the output end of the DC voltage isolation transmitter 150, and the input end of the DC voltage isolation transmitter 150 is used to connect to the battery cluster 210.

[0066] The DC voltage isolation transmitter 150 is used to convert the output voltage of the battery cluster 210 into a low voltage, that is, to convert the total DC voltage of the battery cluster 210 into a low voltage signal for subsequent circuit processing. The voltage conversion ratio of the DC voltage isolation transmitter 150 is set according to actual requirements and is not limited here. For ease of understanding, in the embodiment of the present application, the voltage conversion ratio of the DC voltage isolation transmitter 150 is 1000:10, converting the voltage of the battery cluster 210 into a low voltage signal of 0 to 10V.

[0067] In the embodiment of the present application, the first comparison sub-circuit 110 includes a first comparator U1 and a first protection resistor R11;

[0068] The first input end of the first comparator U1 is connected to the output end of the DC voltage isolation transmitter 150, and the output end of the first comparator U1 is connected to the first input end of the OR gate sub-circuit 130;

[0069] One side of the first protection resistor R11 is connected to the output terminal of the first comparator U1, the other side of the first protection resistor R11 is used to connect to the control power supply, and the second input terminal of the first comparator U1 is used to connect to the control power supply;

[0070] The first comparator U1 is used to output a preset level signal when the output of the DC voltage isolation transmitter 150 is lower than the first voltage.

[0071] Generally, it is necessary to supply power to the first comparison sub-circuit 110 and the second comparison sub-circuit 120 through the control power supply. The DC voltage isolation transmitter 150 is connected to the first comparison sub-circuit 110 and the second comparison sub-circuit 120 to convert the voltage into a voltage value suitable for the control power supply. It should be understood that the DC voltage isolation transmitter 150 can be replaced by other transformer components, and other transformer components are set according to actual needs, which can be current transformers and DC voltage dividers, etc., and are not limited here.

[0072] In this embodiment, the first input terminal of the first comparator U1 is the non-inverting input terminal, and the second input terminal is the inverting input terminal. The first input terminal of the first comparator U1 is connected to the output terminal of the DC voltage isolation transmitter 150, the output terminal of the first comparator U1 is connected to the first input terminal of the OR gate sub-circuit 130, and the second input terminal of the first comparator U1 is used to connect to the control power supply. The first comparator U1 is used to compare the voltage signal output by the DC voltage isolation transmitter 150 with the overvoltage threshold. When the output of the DC voltage isolation transmitter 150 is lower than the first voltage, that is, when the output voltage of the DC voltage isolation transmitter 150 is higher than the overvoltage threshold, the first comparator U1 outputs a preset level signal.

[0073] One side of the first protection resistor R11 is connected to the output terminal of the first comparator U1, and the other side of the first protection resistor R11 is used to connect to the control power supply. The first protection resistor R11 is used to limit the current at the output terminal of the first comparator U1 to prevent excessive current from damaging the circuit.

[0074] In the embodiment of the present application, the first comparison sub-circuit 110 further includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2;

[0075] One side of the first voltage dividing resistor R1 is grounded through the second voltage dividing resistor R2, and the other side of the first voltage dividing resistor R1 is used to connect to the control power supply;

[0076] The second input terminal of the first comparator U1 is connected to the node between the first voltage dividing resistor R1 and the second voltage dividing resistor R2.

[0077] The first voltage is the overvoltage threshold, and the second voltage is the undervoltage threshold. The values of the first voltage and the second voltage are set according to actual requirements and are not limited herein. For ease of understanding, in the embodiments of the present application, the first voltage is 9V and the second voltage is 6V. The resistance values of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are set according to the actual overvoltage threshold and are not limited herein. For ease of understanding, in the embodiments of the present application, the resistance value of the first voltage-dividing resistor R1 is 5 kΩ, and the resistance value of the second voltage-dividing resistor R2 is 3 kΩ, and the overvoltage value of the battery string 210 is 900V. The second input terminal of the first comparator U1 is connected to the node between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2. The first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 form a first voltage-dividing circuit, and the voltage of the control power supply is divided into 9V through the first voltage-dividing circuit to be used as the overvoltage threshold.

[0078] The voltage signal output by the DC voltage isolation transmitter 150 is input to the non-inverting input terminal of the first comparator U1, and the voltage of the control power supply divided into 9V is input to the inverting input terminal of the first comparator U1. When the real-time voltage of the battery string 210 is higher than 900V, the overvoltage of the battery string 210 causes the output voltage of the DC voltage isolation transmitter 150 to exceed 9V, and the first comparator U1 outputs a preset level signal.

[0079] In the embodiments of the present application, the second comparison sub-circuit 120 includes a second comparator U2 and a second protection resistor R12;

[0080] The first input terminal of the second comparator U2 is connected to the output terminal of the DC voltage isolation transmitter 150, and the output terminal of the second comparator U2 is connected to the second input terminal of the OR gate sub-circuit 130;

[0081] One side of the second protection resistor R12 is connected to the output terminal of the second comparator U2, the other side of the second protection resistor R12 is used to connect to the control power supply, and the second input terminal of the second comparator U2 is used to connect to the control power supply;

[0082] The second comparator U2 is used to output a preset level signal when the output of the DC voltage isolation transmitter 150 is lower than the second voltage, where the first voltage is greater than the second voltage.

[0083] In this embodiment, the first input terminal of the second comparator U2 is the non-inverting input terminal, and the second input terminal is the inverting input terminal. The first input terminal of the second comparator U2 is connected to the output terminal of the DC voltage isolation transmitter 150, and the output terminal of the second comparator U2 is connected to the second input terminal of the OR gate sub-circuit 130. The second comparator U2 is used to compare the voltage signal output by the DC voltage isolation transmitter 150 with the undervoltage threshold. When the output of the DC voltage isolation transmitter 150 is lower than the second voltage, that is, when the output voltage of the DC voltage isolation transmitter 150 is lower than the undervoltage threshold, a preset level signal is output.

[0084] One side of the second protection resistor R12 is connected to the output terminal of the second comparator U2, and the other side of the second protection resistor R12 is used to connect to the control power supply. The second protection resistor R12 is used to limit the current at the output terminal of the second comparator U2 and prevent the circuit from being damaged due to excessive current.

[0085] In the embodiment of the present application, the first comparison sub-circuit 110 further includes a third voltage-dividing resistor R3 and a fourth voltage-dividing resistor R4;

[0086] One side of the third voltage-dividing resistor R3 is grounded through the fourth voltage-dividing resistor R4, and the other side of the third voltage-dividing resistor R3 is used to connect to the control power supply;

[0087] The second input terminal of the second comparator U2 is connected to the node between the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4.

[0088] The resistance values of the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 are set according to the actual undervoltage threshold, which is not limited here. For the sake of understanding, in the embodiment of the present application, the resistance value of the first voltage-dividing resistor R1 is 3 kΩ, and the resistance value of the second voltage-dividing resistor R2 is 1 kΩ, and the undervoltage value of the battery cluster 210 is 600 V. The second input terminal of the second comparator U2 is connected to the node between the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4. The third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 form a second voltage-dividing circuit, and the voltage of the control power supply is divided into 6 V through the second voltage-dividing circuit to be used as the undervoltage threshold.

[0089] The voltage signal output by the DC voltage isolation transmitter 150 is input to the non-inverting input terminal of the second comparator U2, and the voltage of the control power supply divided into 6 V is input to the inverting input terminal of the second comparator U2. When the real-time voltage of the battery cluster 210 is lower than 600 V, the undervoltage of the battery cluster 210 causes the output voltage of the DC voltage isolation transmitter 150 to be lower than 6 V, and the second comparator U2 outputs a preset level signal.

[0090] In the embodiment of the present application, the OR gate sub-circuit 130 includes a first diode D1, a second diode D2, and a third protection resistor R13;

[0091] The anode of the first diode D1 is connected to the output terminal of the first comparison sub-circuit 110, the second diode D2 is connected to the output terminal of the second comparison sub-circuit 120, and the cathodes of the first diode D1 and the second diode D2 are both connected to the circuit breaker 140;

[0092] The cathodes of the first diode D1 and the second diode D2 are both grounded through the third protection resistor R13.

[0093] The anode of the first diode D1 is connected to the output terminal of the first comparator sub - circuit 110, the second diode D2 is connected to the output terminal of the second comparator sub - circuit 120, and the cathodes of the first diode D1 and the second diode D2 are both connected to the circuit breaker 140. When the first comparator sub - circuit 110 outputs a preset level signal, the first diode D1 conducts, causing the OR - gate sub - circuit 130 to output a high - level control signal. When the second comparator sub - circuit 120 outputs a preset level signal, the second diode D2 conducts, causing the OR - gate sub - circuit 130 to output a high - level control signal.

[0094] The cathodes of the first diode D1 and the second diode D2 are both grounded through the third protection resistor R13. The third protection resistor R13 is used to limit the current at the output terminal of the OR - gate sub - circuit 130 and prevent damage to the circuit due to excessive current.

[0095] In an embodiment of the present application, the voltage protection circuit 100 further includes a relay 160;

[0096] The cathodes of the first diode D1 and the second diode D2 are both connected to the circuit breaker 140 through the relay 160;

[0097] The relay 160 is used to drive the circuit breaker 140 to open when the input is a preset level signal.

[0098] The relay 160 is used to drive the circuit breaker 140 to open when the input is a preset level signal.

[0099] The OR - gate sub - circuit 130 performs a logical OR operation on the output signals of the first comparator sub - circuit 110 and the second comparator sub - circuit 120 and outputs a control signal. The cathodes of the first diode D1 and the second diode D2 are both connected to the circuit breaker 140 through the relay 160. When the first comparator sub - circuit 110 or the second comparator sub - circuit 120 outputs a high - level signal, the OR - gate sub - circuit 130 outputs a high - level signal, driving the relay 160 to act.

[0100] The relay 160 is used to control the on - off of the circuit breaker 140 according to the output signal of the OR - gate sub - circuit 130. When the input is a preset level signal, that is, when the OR - gate sub - circuit 130 outputs a high - level control signal, the coil of the relay 160 is energized, the contacts of the relay 160 are closed, driving the circuit breaker 140 to trip and cut off the circuit. When the OR - gate sub - circuit 130 outputs a low - level control signal, the coil of the relay 160 is de - energized, the contacts of the relay 160 are opened, and the circuit breaker 140 remains closed, and the circuit operates normally. The contacts of the relay 160 should be correctly connected to the control terminal of the circuit breaker 140 to ensure that the circuit can be quickly cut off when the voltage is abnormal.

[0101] The present application provides a voltage protection circuit 100, which includes a first comparison sub-circuit 110, a second comparison sub-circuit 120, an OR gate sub-circuit 130, and a circuit breaker 140. The output terminal of the first comparison sub-circuit 110 is connected to the first input terminal of the OR gate sub-circuit 130, the output terminal of the second comparison sub-circuit 120 is connected to the second input terminal of the OR gate sub-circuit 130, and the output terminals of the OR gate sub-circuit 130 and the circuit breaker 140 are connected to the circuit breaker 140. The input terminals of the first comparison sub-circuit 110 and the second comparison sub-circuit 120 are both used to connect to the battery cluster 210 to be protected. The circuit breaker 140 is used to disconnect the connection between the battery cluster 210 and the power output terminal when the output signal of the OR gate sub-circuit 130 is a preset level signal. Voltage protection is performed through the pure hardware voltage protection circuit 100, which does not rely on the control software, avoiding the failure of the power protection function caused by software crashes or system failures. In addition, no additional circuit operation data needs to be detected and processed during the protection process, reducing the data processing volume, having a short response time, ensuring that the battery cluster 210 can cut off the circuit in a timely manner when the voltage is abnormal, avoiding the failure of the power protection function, and further avoiding battery damage or safety accidents.

[0102] Please refer to Figure 3 , Figure 3 which shows the structural schematic diagram of the power supply circuit provided by the embodiment of the present application.

[0103] The embodiment of the present application further provides a power supply circuit 200, which includes a battery cluster 210 and the above-mentioned voltage protection circuit 100;

[0104] The output terminal of the battery cluster 210 is connected to the voltage protection circuit 100;

[0105] The battery cluster 210 is used for high-voltage power supply.

[0106] The battery cluster 210 is a battery pack usually composed of multiple batteries connected in series or in parallel to meet various functional requirements. The type of the battery cluster 210 is set according to actual needs and is not limited here. When the battery cluster 210 has overvoltage or undervoltage, the connection can be cut off through the voltage protection circuit 100, thereby realizing the third-level hardware protection.

[0107] The embodiment of the present application further provides a high-voltage electric box 1000, which includes the above-mentioned power supply circuit 200;

[0108] The high-voltage electric box 1000 is used for AC power supply.

[0109] In this embodiment, the high-voltage electrical box 1000 includes a box body and the above-mentioned power supply circuit 200. The first comparison sub-circuit 110, the second comparison sub-circuit 120, the OR gate sub-circuit 130, and the DC voltage isolation transmitter 150 are all integrated inside the box body. The box body also includes a relay 160 output interface, so that the relay 160 and the circuit breaker 140 are arranged outside the box body.

[0110] When the total DC voltage of the battery cluster 210 is normal, the voltage signal output by the DC voltage isolation transmitter 150 is between 6V and 9V. Both the first comparison sub-circuit 110 and the second comparison sub-circuit 120 output low-level signals, the OR gate sub-circuit 130 outputs a low-level signal, the relay 160 does not operate, and the circuit breaker 140 remains closed, and the circuit works normally.

[0111] When the total DC voltage of the battery cluster 210 is greater than the overvoltage threshold, the voltage signal output by the DC voltage isolation transmitter 150 is higher than 9V. The first comparison sub-circuit 110 outputs a high-level signal, the OR gate sub-circuit 130 outputs a high-level signal, the relay 160 is energized, driving the circuit breaker 140 to trip and cutting off the voltage protection circuit 100.

[0112] When the total DC voltage of the battery cluster 210 is lower than the undervoltage threshold, the voltage signal output by the DC voltage isolation transmitter 150 is lower than 6V. The second comparison sub-circuit 120 outputs a high-level signal, the OR gate sub-circuit 130 outputs a high-level signal, the relay 160 is energized, driving the circuit breaker 140 to trip and cutting off the voltage protection circuit 100. The power supply circuit 200 is implemented by low-cost devices, making the cost of the high-voltage box relatively low.

[0113] It should also be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, commodity or device including the element.

[0114] The above are only embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A voltage protection circuit, characterized in that: The voltage protection circuit includes a first comparison subcircuit, a second comparison subcircuit, an OR gate subcircuit and a circuit breaker; The output end of the first comparison subcircuit is connected to the first input end of the OR gate subcircuit, the output end of the second comparison subcircuit is connected to the second input end of the OR gate subcircuit, the output end of the OR gate subcircuit and the circuit breaker is connected to the circuit breaker, and the input end of the first comparison subcircuit and the input end of the second comparison subcircuit are both used to connect to the battery cluster to be protected; The first comparison subcircuit is used to output a preset level signal when the battery cluster is in an overvoltage state; The second comparison subcircuit is used to output a preset level signal when the battery cluster is in an undervoltage state; The circuit breaker is used to disconnect the battery cluster from the power output terminal when the output signal of the OR gate subcircuit is a preset level signal.

2. The voltage protection circuit according to claim 1, characterized in that: The voltage protection circuit also includes a DC voltage isolation transmitter; The input end of the first comparison subcircuit and the input end of the second comparison subcircuit are both used to connect to the output end of a DC voltage isolation transmitter, and the input end of the DC voltage isolation transmitter is used to connect to the battery cluster; The DC voltage isolation transmitter is used to convert the output voltage of the battery cluster into a low voltage.

3. The voltage protection circuit according to claim 2, characterized in that: The first comparison subcircuit includes a first comparator and a first protection resistor; The first input end of the first comparator is connected to the output end of the DC voltage isolation transmitter, and the output end of the first comparator is connected to the first input end of the OR gate subcircuit; One side of the first protection resistor is connected to the output end of the first comparator, the other side of the first protection resistor is used to connect to the control power supply, and the second input end of the first comparator is used to connect to the control power supply; The first comparator is used to output a preset level signal when the output of the DC voltage isolation transmitter is lower than the first voltage.

4. The voltage protection circuit according to claim 3, characterized in that: The first comparison subcircuit further includes a first voltage-dividing resistor and a second voltage-dividing resistor; One side of the first voltage-dividing resistor is grounded through the second voltage-dividing resistor, and the other side of the first voltage-dividing resistor is used to connect the control power supply; The second input terminal of the first comparator is connected to a node between the first voltage-dividing resistor and the second voltage-dividing resistor.

5. The voltage protection circuit according to claim 3, characterized in that: The second comparison subcircuit includes a second comparator and a second protection resistor; The first input end of the second comparator is connected to the output end of the DC voltage isolation transmitter, and the output end of the second comparator is connected to the second input end of the OR gate subcircuit; One side of the second protection resistor is connected to the output end of the second comparator, the other side of the second protection resistor is used to connect to the control power supply, and the second input end of the second comparator is used to connect to the control power supply; The second comparator is used to output a preset level signal when the output of the DC voltage isolation transmitter is lower than a second voltage, wherein the first voltage is greater than the second voltage.

6. The voltage protection circuit according to claim 5, characterized in that: The first comparison subcircuit further includes a third voltage-dividing resistor and a fourth voltage-dividing resistor; One side of the third voltage-dividing resistor is grounded through the fourth voltage-dividing resistor, and the other side of the third voltage-dividing resistor is used to connect the control power supply; The second input terminal of the second comparator is connected to a node between the third voltage-dividing resistor and the fourth voltage-dividing resistor.

7. The voltage protection circuit according to claim 1, characterized in that: The OR gate subcircuit includes a first diode, a second diode and a third protection resistor; An anode of the first diode is connected to an output end of the first comparison subcircuit, the second diode is connected to an output end of the second comparison subcircuit, and a cathode of the first diode and a cathode of the second diode are both connected to the circuit breaker; The cathode of the first diode and the cathode of the second diode are both grounded through the third protection resistor.

8. The voltage protection circuit according to claim 7, characterized in that: The voltage protection circuit also includes a relay; The cathode of the first diode and the cathode of the second diode are both connected to the circuit breaker through the relay; The relay is used to drive the circuit breaker to open when the input is a preset level signal.

9. A power supply circuit, characterized in that: comprising a battery cluster and a voltage protection circuit according to any one of claims 1 to 8; The output end of the battery cluster is connected to the voltage protection circuit; The battery cluster is used for high voltage power supply.

10. A high voltage electric box, characterized in that: The power supply circuit comprising claim 9; The high-voltage electric box is used for AC power supply.

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