Direct-current power supply fault latch circuit and energy storage system

Abstract

The utility model relates to the technical field of energy storage power supplies, and mainly provides a direct-current power supply fault latch circuit and an energy storage system, the circuit comprises a switch module connected with a battery and a direct-current power supply, a latch module connected with the switch module, and a sampling resistor connected with the latch module, and the sampling resistor is also connected with the negative electrode of the battery and the negative electrode of the direct-current power supply. The switch module is also used for receiving the driving signal. The sampling resistor outputs a sampling voltage to the latch module according to the output current of the cathode of the DC power supply. The latch module is used for controlling the switch module to start working according to the driving signal when the sampling voltage is smaller than the preset voltage so as to output the power supply voltage of the battery to the direct-current power supply; and when the sampling voltage is greater than the preset voltage, it is considered that an overcurrent short circuit fault occurs, and at the moment, a turn-off signal is continuously output to the switch module to close the switch module and lock the closed state, so that output of the power supply voltage is stopped, and the service life of the energy storage system is prolonged while the energy storage system is protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of energy storage power supply especially relates to a direct current source fault latch circuit and energy storage system. BACKGROUND

[0002] In the energy storage system, the battery is often connected with the direct current source (DC) through the switching tube to realize the switching and collaborative work of multiple power supply modes and meet the power demand of the equipment under different working conditions.

[0003] However, when the equipment connected with the DC output occurs short circuit fault or overcurrent fault, the current in the circuit will increase sharply, and since there is electrical connection between the battery and the DC, the excessive short circuit current will generate a large voltage drop in the circuit, thereby causing the output voltage of the battery to be pulled down. When the input voltage of the battery is lower than the normal working voltage threshold of the switching tube, the switching tube may not be normally turned on or turned off, so that the voltage and current borne by the switching tube exceed its voltage stress and current stress, which easily causes damage to the switching tube. Once the switching tube is damaged, the power transmission path of the entire power supply system will be destroyed, thereby causing the energy storage system to malfunction and reducing the service life of the energy storage system. SUMMARY

[0004] The utility model embodiment provides a direct current source fault latch circuit and energy storage system, it aims at solving the technical problem that the energy storage system in prior art is caused to malfunction when the electric equipment short circuit or overcurrent in the energy storage system, reduces the service life of energy storage system.

[0005] To solve the above technical problems, one technical scheme adopted by the utility model embodiment is to provide a direct current source fault latch circuit, which comprises a switching module, a latch module and a sampling resistor.

[0006] The switching module is connected with the latch module, the latch module is connected with the sampling resistor, the switching module is also connected with the battery and the direct current source, the sampling resistor is also used for being connected with the negative electrode of the battery and the negative electrode of the direct current source, and the switching module is also used for receiving a driving signal.

[0007] The sampling resistor responds to the output current of the negative electrode of the direct current source and outputs a sampling voltage to the latch module based on the output current.

[0008] The latch module is used for judging whether the sampling voltage is greater than a preset voltage, and when the sampling voltage is less than the preset voltage, the switching module is controlled to start working according to the driving signal, so that the power supply voltage of the battery is output to the direct current source.

[0009] outputting the off signal to the switch module continuously when the sampling voltage is greater than the preset voltage, so that the switch module exits work according to the off signal, thereby stopping outputting the power supply voltage.

[0010] Optionally, the latch module comprises a latch unit, a comparison unit and a first control unit.

[0011] The comparison unit is connected with the sampling resistor and the first power supply respectively, and the comparison unit is further connected with the first control unit; the latch unit is connected with the comparison unit and the first power supply respectively, and the first control unit is further used for connecting the switch module.

[0012] The comparison unit is used for receiving the sampling voltage, and outputting a first control signal to the first control unit when the sampling voltage is less than a preset voltage, so that the first control unit controls the switch module to start work based on the driving signal; and

[0013] outputting a second control signal to the first control unit when the sampling voltage is greater than the preset voltage, so that the first control unit outputs an off signal to the switch module based on the second control signal.

[0014] The latch unit is used for locking the working state of the comparison unit according to the second control signal when the comparison unit outputs the second control signal, so that the first control unit outputs the off signal to the switch module continuously.

[0015] Optionally, the comparison unit comprises a comparator U2A, a resistor R10, a resistor R15, a resistor R14 and a capacitor C7.

[0016] The resistor R10 is connected with the first power supply and the inverting input terminal of the comparator U2A respectively, the inverting input terminal of the comparator U2A is further connected with the ground through the resistor R15, the non-inverting input terminal of the comparator U2A is connected with the sampling resistor, the non-inverting input terminal of the comparator U2A is further connected with the ground through the capacitor C7, the resistor R14 is connected with the capacitor C7 in parallel, and the output terminal of the comparator U2A is connected with the first control unit.

[0017] Optionally, the latch unit comprises a resistor R11 and a diode D3.

[0018] The resistor R11 is connected with the first power supply and the anode of the diode D3 respectively, the anode of the diode D3 is further connected with the output terminal of the comparator U2A, and the cathode of the diode D3 is further connected with the non-inverting input terminal of the comparator U2A.

[0019] Optionally, the first control unit comprises a switch tube Q3.

[0020] The control end of the switch tube Q3 is connected with the comparison unit, the first end of the switch tube Q3 is connected with the switch module, and the second end of the switch tube Q3 is used for grounding.

[0021] Optionally, the direct-current power supply fault latching circuit further comprises an amplification module.

[0022] The amplification module is connected with the sampling resistor and the latching module respectively.

[0023] The amplification module is used for receiving the sampling voltage output by the sampling resistor and outputting the amplified sampling voltage to the latching module.

[0024] Optionally, the amplification module comprises a differential amplifier U1A and a resistor R8.

[0025] Two input ends of the differential amplifier U1A are connected with two ends of the sampling resistor respectively, the non-inverting input end of the differential amplifier U1A is further used for connecting a second power supply, the output end of the differential amplifier U1A is connected with the latching module, and the resistor R8 is connected with the output end of the differential amplifier U1A and the inverting input end of the differential amplifier U1A respectively.

[0026] Optionally, the switch module comprises a second control unit and a switch unit.

[0027] The second control unit is connected with the switch unit and the latching module respectively, the second control unit is further used for receiving a driving signal, and the switch unit is further connected with the battery and the direct-current power supply respectively.

[0028] The second control unit is used for receiving an off signal output by the latching module and stopping working based on the off signal, so as to control the switch unit to be disconnected.

[0029] When the off signal is not received, the second control unit starts working according to the driving signal, so as to control the switch unit to be connected, thereby outputting the power supply voltage of the battery to the direct-current power supply.

[0030] Optionally, the switch unit comprises a switch tube Q1, a resistor R1 and a resistor R2.

[0031] The control end of the switch tube Q1 is connected with the second control unit through the resistor R2, the first end of the switch tube Q1 is connected with the battery, the first end of the switch tube Q1 is further connected with the control end of the switch tube Q1 through the resistor R1, and the second end of the switch tube Q1 is used for connecting the direct-current power supply.

[0032] To solve the above technical problems, the utility model discloses another technical scheme which is: provide a kind of energy storage system, described energy storage system includes:

[0033] Direct-current power supply;

[0034] Battery;And

[0035] Direct-current power supply fault latching circuit as described above.

[0036] Different from the related art, the utility model provides a kind of direct-current power supply fault latching circuit and energy storage system, the direct-current power supply fault latching circuit includes switch module, latching module and sampling resistance;The switch module is connected with the latching module, the latching module is connected with the sampling resistance, the switch module is also connected with battery and direct-current power supply, the sampling resistance is also used to be connected with the negative pole of the battery and the negative pole of the direct-current power supply, and the switch module is also used to receive drive signal.The sampling resistance is in response to the output current of the negative pole of the direct-current power supply, to determine whether the output end of the direct-current power supply occurs short circuit or overcurrent fault according to the output current, then based on the output current output sampling voltage to the latching module.The latching module is used to judge whether the sampling voltage is greater than preset voltage, and when the sampling voltage is less than preset voltage, it is determined that overcurrent and short circuit fault do not appear, at this time, the switch module is controlled according to the drive signal to start working, so that the power supply voltage of the battery is output to the direct-current power supply;When the sampling voltage is greater than the preset voltage, it is considered that overcurrent or short circuit fault appears, at this time, the switch module is continuously output off signal to the switch module, to close and lock the closing state of the switch module, so that the output power supply voltage is stopped when short circuit or overcurrent fault occurs, and then the service life of the energy storage system is improved while the energy storage system is protected.

DRAWINGS

[0037] One or more embodiments are illustrated by way of example in the accompanying drawings, which do not limit the embodiments, and elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified, and the drawings do not constitute a proportional limit.

[0038] Figure 1 Is a kind of application scenario schematic diagram provided by the utility model embodiment;

[0039] Figure 2 It is the structure block diagram of a kind of direct-current power supply fault latching circuit provided by the utility model embodiment;

[0040] Figure 3 It is the circuit diagram of a kind of direct-current power supply fault latching circuit provided by the utility model embodiment;

[0041] Figure 4 This is a circuit diagram of a DC power supply fault latching circuit provided in another embodiment of the present invention.

Detailed Implementation Methods

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0043] The technical features involved in the various embodiments of this application described below do not conflict with each other and can be combined with each other.

[0044] When an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements between them.

[0045] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more.

[0046] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0047] Please see Figure 1 , Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of the present utility model, such as... Figure 1As shown, the application scenario 1 includes an energy storage power supply 100, a direct current power supply 200 and a load 300, the energy storage power supply 100 is connected with the load 300 through the direct current power supply 200, the direct current power supply 200 is used to receive the power voltage output by the energy storage power supply 100, and convert and process the power voltage to output preset direct current to the load 300, so that the load 300 works normally. It should be noted that when the energy storage power supply 100 supplies power to the load 300, the voltage output by the energy storage power supply 100 may be alternating current, and the working voltage of the load 300 is direct current. At this time, the alternating current is output to the direct current power supply 200, so that the alternating current is converted into direct current by the direct current power supply 200 and then input to the load 300, so that the load 300 works normally.

[0048] In yet another embodiment, when the energy storage power supply 100 outputs direct current, there may be a mismatch between the voltage output by the energy storage power supply 100 and the load 300. Therefore, during the process of the energy storage power supply 100 supplying power to the load 300, the energy storage power supply 100 inputs voltage to the direct current power supply 200 to adjust the direct current by the direct current power supply 200, so that the direct current input to the load 300 matches the working voltage.

[0049] In some embodiments, as Figure 1As shown, the energy storage power supply 100 further comprises a battery 10 connected with the direct current power supply 200, and the battery 10 is used to output voltage to the direct current power supply 200. However, when the direct current power supply 200 supplies power to the load 300 based on the voltage output by the battery 10, if the load 300 occurs short circuit fault, the current of the direct current power supply 200 will be sharply increased, so that the voltage of the battery 10 is pulled down, and then the energy storage power supply 100 is damaged. Based on this, in order to protect the energy storage power supply 100, the energy storage power supply 100 further comprises a direct current power supply fault latching circuit 20 connected with the battery 10 and the direct current power supply 200 respectively. The direct current power supply fault latching circuit 20 is used to collect the output current of the output end of the direct current power supply 200 in real time, and judge whether the output end of the direct current power supply 200 occurs overcurrent short circuit fault based on the size of the output current. When the output end of the direct current power supply 200 occurs short circuit fault, the output of the battery 10 is turned off, so that the situation that the energy storage power supply 100 is damaged due to the short circuit of the output end of the direct current power supply 200 is avoided. It should be noted that after the direct current power supply fault latching circuit 20 turns off the output of the battery 10, the direct current power supply fault latching circuit 20 will continuously maintain the current off state, and if the battery 10 needs to output power supply voltage again, the energy storage power supply 100 needs to be restarted.

[0050] In yet another embodiment, as Figure 1 shown, the energy storage power supply 100 further comprises a controller 30 connected with the direct current power supply fault latching circuit 20, and the controller 30 is used to output a driving signal to the direct current power supply fault latching circuit 20 after the energy storage power supply 100 starts to work, so that the direct current power supply fault latching circuit 20 starts to work according to the driving signal.

[0051] In some embodiments, please refer to Figure 2 , Figure 2 is a structural block diagram of a direct current power supply fault latching circuit provided by the embodiment of the utility model, as Figure 2 shown, the direct current power supply fault latching circuit 20 comprises a switch module 21, a latching module 22 and a sampling resistor R7;

[0052] The switch module 21 is connected with the latching module 22, the latching module 22 is connected with the sampling resistor R7, the switch module 21 is further connected with the output end of the battery 10 and the direct current power supply 200, the sampling resistor R7 is further used to be connected with the negative electrode of the battery 10 and the negative electrode of the direct current power supply 100, and the switch module 21 is further used to receive a driving signal;

[0053] The sampling resistor R7 is responsive to an output current of the negative pole of the DC power supply 200 and outputs a sampling voltage to the latch module 22 based on the output current;

[0054] The latch module 22 is configured to determine whether the sampling voltage is greater than a preset voltage, and when the sampling voltage is less than the preset voltage, control the switch module 21 to start working according to the driving signal, so as to output the power supply voltage of the battery 10 to the DC power supply 200; and

[0055] When the sampling voltage is greater than the preset voltage, the latch module 22 continuously outputs an off signal to the switch module 21, so that the switch module 21 exits working according to the off signal, thereby stopping outputting the power supply voltage.

[0056] Specifically, when the energy storage power supply 100 supplies power to the DC power supply 200, the sampling resistor R7 collects the output current of the negative pole of the DC power supply 200 in real time, and outputs a sampling voltage to the latch module 22 based on the output current, so as to determine whether the output end of the DC power supply 200 has a short circuit fault through the latch module 22. When the sampling voltage is less than a preset voltage, it is considered that the output end of the DC power supply 200 is in a normal state, at this time, the latch module 22 controls the switch module 21 to start working based on the driving signal, so as to transmit the power supply voltage of the battery 10 to the DC power supply 200. If the output end of the DC power supply 200 has a short circuit fault, the current flowing through the sampling resistor R7 will increase sharply, thereby causing the sampling voltage to also increase. When the sampling voltage is greater than the preset voltage, the latch module 22 outputs an off signal to the switch module 21, so that the switch module 21 exits working according to the off signal, thereby stopping transmitting the power supply voltage of the battery 10. Based on this, when the output end of the DC power supply 200 is short-circuited, the energy storage power supply 100 is controlled to stop outputting voltage, thereby protecting the energy storage power supply 100 and achieving the purpose of prolonging the service life of the energy storage power supply 100. It should be noted that when the output end of the DC power supply 200 is short-circuited, the current of the DC power supply 200 will increase sharply, and the large current will flow into the negative pole of the battery 10 through the sampling resistor R7. Based on this, the voltage on the sampling resistor R7 can be collected to determine whether the output end of the DC power supply 200 has a short circuit fault.

[0057] In some embodiments, as shown in Figure 2 The latch module 22 includes a latch unit 221, a comparison unit 222, and a first control unit 223;

[0058] The comparison unit 222 is connected with the sampling resistor R7 and a first power supply (not shown in the figure) respectively, and is also connected with the first control unit 223; the latch unit 221 is connected with the comparison unit 222 and the first power supply respectively, and the first control unit 223 is also used for connecting the switch module 21;

[0059] The comparison unit 222 is used for receiving the sampling voltage, and outputting a first control signal to the first control unit 223 when the sampling voltage is less than a preset voltage, so that the first control unit 223 controls the switch module 21 to start working based on the driving signal; and

[0060] The comparison unit 222 is used for receiving the sampling voltage, and outputting a first control signal to the first control unit 223 when the sampling voltage is less than a preset voltage, so that the first control unit 223 controls the switch module 21 to start working based on the driving signal; and

[0061] The latch unit 221 is used for locking the working state of the comparison unit 222 according to the second control signal when the comparison unit 222 outputs the second control signal, so that the first control unit 223 continuously outputs the off signal to the switch module 21.

[0062] Specifically, when the energy storage power supply 100 outputs a power supply voltage to the direct current power supply 200, the sampling resistor R7 outputs a corresponding sampling voltage to the comparison unit 222 based on the direct current power supply 200, so that the comparison unit 222 judges whether the output end of the direct current power supply 200 has a short circuit fault based on the sampling voltage. Wherein, when the comparison unit 222 receives the sampling voltage, it will judge whether the sampling voltage is less than the preset voltage, if the sampling voltage is less than the preset voltage, it is considered that the output end of the direct current power supply 200 is normal, at this time, the comparison unit 222 will output a first control signal to the first control unit 223, so that the first control unit 223 controls the switch module 21 to work based on the driving signal, so that the battery 10 continuously outputs a power supply voltage to the direct current power supply 200 through the switch module 21. If the sampling voltage is greater than the preset voltage, it is considered that the output end of the direct current power supply 200 has a short circuit fault, at this time, the comparison unit 222 will output a second control signal to the first control unit 223, so that the first control unit 223 outputs an off signal to the switch module 21 based on the second control signal, so that the switch module 21 is in the off state based on the off signal. Based on this, when the output end of the direct current power supply 200 fails, the output of the energy storage power supply 100 is turned off, so as to avoid the influence of the short circuit fault of the output end of the direct current power supply 200 on the energy storage power supply 100, and to improve the service life of the energy storage power supply 100. Wherein, the first power supply is the working voltage of the comparator U2A, and its specific voltage value can be determined according to the comparator U2A.

[0063] When the comparison unit 222 outputs the second control signal to the first control unit 223, the latch unit 221 also receives the second control signal and locks the working state of the comparison unit 222 according to the second control signal, that is, controls the comparison unit 222 to continuously output the second control signal, so that the first control unit 223 continuously outputs the off signal. It should be noted that since the driving signal is a continuous level signal, when the output end of the direct current power supply 200 is short-circuited, the switching module 21 may be misdirected on. In order to avoid the misdirected on of the switching module 21 when the output end of the direct current power supply 200 is short-circuited, the latch unit 221 is introduced at the output end of the comparison unit 222. When the comparison unit 222 determines that the direct current power supply 200 is short-circuited, the first control unit 223 is controlled by the comparison unit 222 to continuously output the off signal, so that the switching module 21 is continuously in the off state, thereby avoiding the misdirected on of the switching module 21, and further improving the safety of the energy storage power supply 100.

[0064] In some embodiments, referring to Figure 3 , Figure 3 is a circuit diagram of a direct current power supply fault latch circuit provided by the embodiment of the utility model, as Figure 3 shown, the comparison unit 222 includes comparator U2A, resistance R10, resistance R15, resistance R14 and capacitor C7;The latch unit 221 includes resistance R11 and diode D3;The first control unit 223 includes switch tube Q3;

[0065] The resistance R10 is connected with the first power supply and the inverting input end of the comparator U2A respectively, the inverting input end of the comparator U2A is also connected with ground through the resistance R15, the noninverting input end of the comparator U2A is connected with the sampling resistance R7, the noninverting input end of the comparator U2A is also connected with ground through the capacitor C7, the resistance R14 is connected with the capacitor C7 in parallel, and the output end of the comparator U2A is connected with the first control unit 223.

[0066] The resistance R11 is connected with the first power supply and the anode of the diode D3 respectively, the anode of the diode D3 is also connected with the output end of the comparator U2A, and the cathode of the diode D3 is also connected with the noninverting input end of the comparator U2A.

[0067] The control end of the switch tube Q3 is connected with the comparison unit 222, the first end of the switch tube Q3 is connected with the switching module 21, and the second end of the switch tube Q3 is used for grounding.

[0068] Specifically, the resistor R10 and the resistor R15 are used to divide the voltage of the first power supply, so as to provide a preset voltage for the inverting input terminal of the comparator U2A. When the sampling resistor R7 outputs a corresponding sampling voltage based on the output current of the DC power supply 200, the non-inverting input terminal of the comparator U2A receives the sampling voltage and compares the sampling voltage with the preset voltage of the inverting input terminal of the comparator U2A. If the sampling voltage is less than the preset voltage, the comparator U2A outputs a low-level signal (a first control signal). At this time, the switch tube Q3 is cut off, and the switch module 21 is continuously in the on state based on the driving signal. If the sampling voltage is greater than the preset voltage, the comparator U2A outputs a high-level signal (a second control signal). When the comparator U2A outputs the high-level signal, on the one hand, the switch tube Q3 is turned on based on the high-level signal, so as to output an off signal to the switch module 21, thereby causing the switch module 21 to be turned off. On the other hand, the voltage of the first power supply is input to the non-inverting input terminal of the comparator U2A through the resistor R11 and the diode D3, so that the voltage of the non-inverting input terminal of the comparator U2A is continuously greater than the voltage of the inverting input terminal of the comparator U2A, thereby causing the comparator U2A to continuously output the second control signal. The preset voltage is determined based on the voltage of the first power supply, the resistance value of the resistor R10, and the resistance value of the resistor R15.

[0069] It should be noted that when the energy storage power supply 100 is powered on, the voltage of the first power supply charges the capacitor C7 through the resistor R11 and the diode D3, and the voltage of the first power supply also provides a preset voltage for the inverting input terminal of the comparator U2A based on the resistor R10 and the resistor R15. Due to the setting of the capacitance value of the capacitor C7 and the resistance value of the resistor Q10, when the voltage stored on the capacitor C7 is greater than the preset voltage, the comparator U2A has been inverted, that is, during the charging process of the capacitor C7, the comparator U2A outputs a low-level signal. When the comparator U2A outputs the low-level signal, the switch tube Q3 is in the cut-off state, so that the switch module 21 can be turned on according to the driving signal. At this time, if the output end of the DC power supply 200 is in a normal state, the comparator U2A continuously outputs the low-level signal.

[0070] In some embodiments, as shown in Figure 2 The DC power supply fault latching circuit 20 further includes an amplification module 23; the amplification module 23 is connected with the sampling resistor R7 and the latching module 22, respectively;

[0071] The amplification module 23 is configured to receive the sampling voltage output by the sampling resistor R7 and output the amplified sampling voltage to the latch module 22.

[0072] Specifically, after the sampling resistor R7 outputs the sampling voltage based on the output current, the sampling voltage is input to the amplification module 23, so that the amplification module 23 amplifies the sampling voltage and inputs the amplified sampling voltage to the latch module 22. It should be noted that, since the sampling resistor R7 has a small resistance value, when the output current flows through the sampling resistor R7, the voltage drop on the sampling resistor R7 is also small. Therefore, in order to accurately determine whether the output end of the DC power supply 200 is short-circuited, the amplification module 23 is introduced, and the sampling voltage is amplified by the amplification module 23, thereby improving the detection accuracy.

[0073] In some embodiments, as shown in Figure 3 The amplification module 23 includes a differential amplifier U1A and a resistor R8.

[0074] The two input ends of the differential amplifier U1A are respectively connected to the two ends of the sampling resistor R7, and the non-inverting input end of the differential amplifier U1A is also configured to be connected to a second power supply (not shown). The output end of the differential amplifier U1A is connected to the latch module 22, and the resistor R8 is respectively connected to the output end of the differential amplifier U1A and the inverting input end of the differential amplifier U1A.

[0075] The differential amplifier refers to a device that amplifies the difference between two input signals. Therefore, when current flows through the sampling resistor R7, a corresponding sampling voltage will also be generated on the sampling resistor R7. At this time, the differential amplifier U1A acquires the voltage drop (sampling voltage) on the sampling resistor R7 and amplifies the voltage drop, and finally inputs the amplified sampling voltage to the latch module 22.

[0076] In another embodiment, as shown in Figure 2 The amplification module 23 further includes a diode D2, the anode of the diode D2 is connected to the output end of the differential amplifier U1A, and the cathode of the diode D2 is connected to the latch module 22. The diode D2 is configured to prevent the current in the latch module 22 from flowing back to the differential amplifier U1A.

[0077] In yet another embodiment, as shown in Figure 2 The switch module 21 includes a second control unit 211 and a switch unit 212.

[0078] The second control unit 211 is connected with the switch unit 212 and the latch module 22 respectively, and is used for receiving a driving signal.

[0079] The second control unit 211 is used for receiving an off signal output by the latch module 22, and stopping working based on the off signal, so as to control the switch unit 212 to be disconnected.

[0080] When the off signal is not received, the second control unit 211 starts working based on the driving signal, so as to control the switch unit 212 to be connected, thereby outputting the power supply voltage of the battery 10 to the direct current power supply 200.

[0081] Specifically, the second control unit 211 is used for receiving a driving signal output by the controller 30 or an off signal output by the latch module 22, and when the off signal is not received, the second control unit 211 controls the switch unit 212 to be connected based on the driving signal, so as to output the power supply voltage of the battery 10 to the direct current power supply 200, and when the off signal is received, the second control unit 211 controls the switch unit 212 to be disconnected based on the off signal, so as to stop transmitting the power supply voltage of the battery 10.

[0082] In another embodiment, please refer to Figure 4 , Figure 4 is a circuit diagram of a direct current power supply fault latch circuit provided by another embodiment of the utility model, as Figure 4 shown, the second control unit 211 includes a switch tube Q2, a resistor R3 and a resistor R6;The switch unit 212 includes a switch tube Q1, a resistor R1 and a resistor R2;

[0083] The control end of the switch tube Q2 receives a driving signal through the resistor R3, and the control end of the switch tube Q2 is also connected with the second end of the switch tube Q2 through the resistor R6, and the control end of the switch tube Q2 is also connected with the latch module 22, the first end of the switch tube Q2 is connected with the switch unit 212, and the second end of the switch tube Q2 is used for grounding.

[0084] The control end of the switch tube Q1 is connected with the second control unit 211 through the resistor R2, the first end of the switch tube Q1 is connected with the battery 10, and the first end of the switch tube Q1 is also connected with the control end of the switch tube Q1 through the resistor R1, and the second end of the switch tube Q1 is used for connecting the direct current power supply 200.

[0085] Specifically, when the switch tube Q2 receives the driving signal output by the controller 30 and is in the on state based on the driving signal, the switch tube Q1 is also turned on, thereby outputting the power supply voltage of the battery 10 to the DC power supply 200. If the switch tube Q2 receives the off signal output by the latch module 22, the switch tube Q2 is turned off based on the off signal, and the switch tube Q1 is also turned off, thereby stopping the output of the power supply voltage of the battery 10.

[0086] In some embodiments, in combination with Figure 3 and Figure 4 When the energy storage power supply 100 is powered on, the controller 30 outputs a driving signal to the switch tube Q2 to control the switch tube Q2 to be turned on, and the switch tube Q1 is also turned on, thereby allowing the battery 10 (BAT+) to output the power supply voltage to the DC power supply 200 (PD+) through the switch tube Q1. Since the comparator U2A outputs a low-level signal at the moment when the energy storage power supply 100 is powered on, the switch tube Q2 maintains the on state based on the driving signal. During the process of the battery 10 outputting the power supply voltage to the DC power supply 200, the sampling resistor R7 also collects the output current of the negative electrode of the DC power supply 200 in real time and outputs a corresponding sampling voltage to the differential amplifier U1A based on the output current. When the differential amplifier U1A receives the sampling voltage, it amplifies the sampling voltage and inputs the amplified sampling voltage to the non-inverting input terminal of the comparator U2A. At this time, if the amplified sampling voltage is less than the preset voltage of the inverting input terminal of the comparator U2A, it is considered that the output terminal of the DC power supply 200 is in a normal state, and the comparator U2A outputs a low-level signal, thereby making the switch tube Q3 in the off state, and the switch tube Q2 continues to be in the on state based on the driving signal, and the switch tube Q1 also continues to transmit the power supply voltage of the battery 10.

[0087] If the amplified sampling voltage is greater than the preset voltage of the inverting input end of the comparator U2A, it is considered that a short circuit fault occurs at the output end of the DC power supply 200, the comparator U2A outputs a high level signal, so that the switch tube Q3 is turned on, after the switch tube Q3 is turned on, the control end voltage of the switch tube Q2 is pulled down, the switch tube Q2 is cut off, and the switch tube Q1 is also cut off, so that the power supply voltage is stopped. At the same time, after the comparator U2A outputs a high level signal, the voltage of the first power supply flows into the non-inverting input end of the comparator U2A through the resistor R11 and the diode D2, so that the voltage of the non-inverting input end of the comparator U2A is continuously greater than the voltage of the inverting input end of the comparator U2A, so that the comparator U2A continuously outputs a high level signal, the switch tube Q3 is continuously in the on state, and the switch tube Q1 is continuously in the off state. Based on this, when the output end of the DC power supply 200 is short-circuited, the circuit is locked, so that the power supply voltage of the battery 10 cannot be output to the DC power supply 200, thereby protecting the energy storage power supply 100 and prolonging the service life of the energy storage power supply 100.

[0088] The utility model provides a kind of DC power supply fault latching circuit, the DC power supply fault latching circuit includes switch module, latching module and sampling resistance;The switch module is connected with the latching module, the latching module is connected with the sampling resistance, the switch module is also connected with battery and DC power supply, the sampling resistance is also used to be connected with the negative pole of the battery and the negative pole of the DC power supply, and the switch module is also used to receive drive signal.The sampling resistance is in response to the output current of the negative pole of the DC power supply, to determine whether the output end of the DC power supply occurs short circuit or overcurrent fault according to the output current, then based on the output current output sampling voltage to the latching module.The latching module is used to judge whether the sampling voltage is greater than preset voltage, and when the sampling voltage is less than preset voltage, it is determined that overcurrent and short circuit fault do not occur, at this time control the switch module starts to work according to the drive signal, so that the power supply voltage of the battery is output to the DC power supply;When the sampling voltage is greater than the preset voltage, it is considered that overcurrent or short circuit fault occurs, at this time, off signal is continuously output to the switch module, to close the switch module and lock closed state, so that power supply voltage is stopped when short circuit or overcurrent fault occurs, to protect the energy storage system while improving the service life of the energy storage system.

[0089] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, rather than limiting them; under the idea of the present application, the technical features in the above examples or different examples can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above, which are not provided in detail for simplicity; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A DC power supply fault latching circuit, characterized in that, The direct current power supply fault latching circuit comprises a switching module, a latching module and a sampling resistor; The switching module is connected with the latching module, the latching module is connected with the sampling resistor, the switching module is further connected with a battery and a direct current power supply, the sampling resistor is further used for being connected with a negative electrode of the battery and a negative electrode of the direct current power supply, and the switching module is further used for receiving a driving signal; The sampling resistor is used for responding to an output current of the negative electrode of the direct current power supply and outputting a sampling voltage to the latching module based on the output current; The latching module is used for judging whether the sampling voltage is greater than a preset voltage, and when the sampling voltage is less than the preset voltage, the latching module is used for controlling the switching module to start working according to the driving signal, so as to output a power voltage of the battery to the direct current power supply; and When the sampling voltage is greater than the preset voltage, a turn-off signal is continuously output to the switching module, so that the switching module exits working according to the turn-off signal, thereby stopping outputting the power voltage.

2. The DC power fail latch circuit of claim 1, wherein, The latching module comprises a latching unit, a comparison unit and a first control unit; The comparison unit is connected with the sampling resistor and a first power supply respectively, the comparison unit is further connected with the first control unit, the latching unit is connected with the comparison unit and the first power supply respectively, and the first control unit is further used for connecting the switching module; The comparison unit is used for receiving the sampling voltage, and when the sampling voltage is less than a preset voltage, the comparison unit is used for outputting a first control signal to the first control unit, so that the first control unit controls the switching module to start working based on the driving signal; and When the sampling voltage is greater than the preset voltage, a second control signal is output to the first control unit, so that the first control unit outputs a turn-off signal to the switching module based on the second control signal; The latching unit is used for locking a working state of the comparison unit according to the second control signal when the comparison unit outputs the second control signal, so that the first control unit continuously outputs the turn-off signal to the switching module.

3. The fault latching circuit of claim 2, wherein, The comparison unit comprises a comparator U2A, a resistor R10, a resistor R15, a resistor R14 and a capacitor C7; The resistor R10 is connected with the first power supply and an inverting input terminal of the comparator U2A respectively, the inverting input terminal of the comparator U2A is further connected with the ground through the resistor R15, a non-inverting input terminal of the comparator U2A is connected with the sampling resistor, the non-inverting input terminal of the comparator U2A is further connected with the ground through the capacitor C7, the resistor R14 is connected with the capacitor C7 in parallel, and an output terminal of the comparator U2A is connected with the first control unit.

4. The fault latching circuit of claim 3, wherein, The latching unit comprises a resistor R11 and a diode D3; The resistor R11 is connected with the first power supply and an anode of the diode D3 respectively, the anode of the diode D3 is further connected with the output terminal of the comparator U2A, and a cathode of the diode D3 is further connected with the non-inverting input terminal of the comparator U2A.

5. The fault latching circuit of claim 2, wherein, The first control unit comprises a switching tube Q3; The control end of the switch tube Q3 is connected with the comparison unit, the first end of the switch tube Q3 is connected with the switch module, and the second end of the switch tube Q3 is used for grounding.

6. The fail-safe latch circuit of claim 1, wherein, The direct current power supply fault latching circuit further comprises an amplification module; The amplification module is connected with the sampling resistor and the latching module respectively; The amplification module is used for receiving the sampling voltage output by the sampling resistor and outputting the amplified sampling voltage to the latching module.

7. The fault latching circuit of claim 6, wherein, The amplification module comprises a differential amplifier U1A and a resistor R8. Two input ends of the differential amplifier U1A are connected with two ends of the sampling resistor respectively, the non-inverting input end of the differential amplifier U1A is further used for connecting a second power supply, the output end of the differential amplifier U1A is connected with the latching module, and the resistor R8 is connected with the output end of the differential amplifier U1A and the inverting input end of the differential amplifier U1A respectively.

8. The fail-safe latch circuit of claim 1, wherein, The switch module comprises a second control unit and a switch unit; The second control unit is connected with the switch unit and the latching module respectively, the second control unit is further used for receiving a driving signal, and the switch unit is further connected with the battery and the direct current power supply respectively; The second control unit is used for receiving an off signal output by the latching module and stopping working based on the off signal, so as to control the switch unit to be disconnected; and When the off signal is not received, the second control unit starts working according to the driving signal, so as to control the switch unit to be connected, thereby outputting the power supply voltage of the battery to the direct current power supply.

9. The fault latching circuit of claim 8, wherein, The switch unit comprises a switch tube Q1, a resistor R1 and a resistor R2. The control end of the switch tube Q1 is connected with the second control unit through the resistor R2, the first end of the switch tube Q1 is connected with the battery, the first end of the switch tube Q1 is further connected with the control end of the switch tube Q1 through the resistor R1, and the second end of the switch tube Q1 is used for connecting the direct current power supply.

10. An energy storage system characterized by, The energy storage system comprises: a direct current power supply; a battery; and The direct current power supply fault latching circuit according to any one of claims 1-9.

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