Voltage control circuit and energy storage system

Abstract

The utility model relates to the technical field of energy storage power supply mainly provides a voltage control circuit and energy storage system, this voltage control circuit includes detection module, the switch module that is connected with detection module and the voltage limiting module that is parallel with switch module, switch module is used for connecting power supply and load respectively, detection module is still used for with power supply connection. Detection module is used for detecting the output voltage of power supply, and when the output voltage is less than the first preset value, switch module is controlled to turn on, thereby based on switch module power supply for load. And if the output voltage is greater than the first preset value, then think that the output voltage of power supply is too big, at this moment, detection module will control switch module to open, to make the output voltage input to voltage limiting module. And the voltage limiting module will limit the output voltage in the preset range and output to the load after receiving the output voltage, to avoid the loss of the load caused by the larger voltage, thereby improving the reliability of energy storage system.

Description

[Technical Field]

[0002] This utility model relates to the technical field of energy storage power supply, and in particular to a voltage control circuit and energy storage system. [Background Technology]

[0004] With the rapid development of the new energy industry, especially energy storage power products, a wide variety of energy storage power products with different power ranges and battery capacities are emerging to meet the diverse needs of market customers. For energy storage power supplies with large battery capacities, the battery voltage range is relatively wide.

[0005] Energy storage power supplies typically draw power directly from the battery pack, and the output circuit generally uses a BUCK circuit. In applications with a wide battery voltage input, if the output voltage is high, the BUCK circuit will result in a smaller duty cycle, leading to increased switching losses. Furthermore, the conduction time of the freewheeling diode will be prolonged, further increasing losses. [Utility Model Content]

[0007] This utility model provides a voltage control circuit and an energy storage system, aiming to solve the technical problem of high energy loss in existing energy storage systems.

[0008] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is: to provide a voltage control circuit, the voltage control circuit including a detection module, a switching module and a voltage limiting module;

[0009] The detection module is connected to the switch module, and the switch module is used to connect the power supply and the load respectively. The voltage limiting module is connected in parallel with the switch module, and the detection module is also used to connect to the power supply.

[0010] The detection module is used to detect the output voltage of the power supply and output a control signal when the output voltage is greater than a first preset value.

[0011] The switching module is used to transmit the output voltage to the load by turning on the power supply according to the output voltage of the power source when no control signal is received; and

[0012] Turn off upon receiving the control signal;

[0013] The voltage limiting module is used to limit the output voltage to a preset range when the switching module is turned off, and to output the limited output voltage to the load.

[0014] Optionally, the switching module includes a control unit and a first switching unit;

[0015] The control unit is connected to the first switching unit and the detection module respectively. The control unit is also used to connect to the power supply. The first switching unit is used to connect to the power supply and the load respectively.

[0016] The control unit is configured to receive the output voltage and, when no control signal is received, to start operating based on the output voltage to control the first switching unit to turn on; and

[0017] Upon receiving the control signal, the device stops operating according to the control signal, thereby turning off the first switching unit.

[0018] Optionally, the control unit includes resistor R3, resistor R7, and switching transistor Q3;

[0019] The switching transistor Q3 is connected to the detection module and the resistor R7 respectively. The resistor R3 is connected to the power supply. The first end of the switching transistor Q3 is connected to the first switching unit, and the second end of the switching transistor Q3 is used for grounding.

[0020] Optionally, the first switching unit includes a switching transistor Q5, a resistor R8, and a resistor R9;

[0021] The control terminal of the switch Q5 is connected to the control unit through the resistor R9. The control terminal of the switch Q5 is also connected to the first terminal of the switch Q5 through the resistor R8. The first terminal of the switch Q5 is also connected to the power supply. The second terminal of the switch Q5 is connected to the load.

[0022] Optionally, the detection module includes a Zener diode ZD1, a resistor R1, a resistor R2, and a switching transistor Q1;

[0023] The cathode of the Zener diode ZD1 is connected to the power supply, and the anode of the Zener diode ZD1 is connected to the control terminal of the switch Q1 through the resistor R1. The control terminal of the switch Q1 is also grounded through the resistor R2. The first terminal of the switch Q1 is connected to the switch module, and the second terminal of the switch Q1 is used for grounding.

[0024] Optionally, the voltage limiting module is a Zener diode DZ3;

[0025] The cathode of the Zener diode ZD3 is connected to the power supply, and the anode of the Zener diode ZD3 is connected to the load.

[0026] Optionally, the voltage control circuit further includes an undervoltage detection and control module;

[0027] The undervoltage detection and control module is connected to the switch module and the voltage limiting module respectively, and the undervoltage detection and control module is also used to connect to the power supply.

[0028] The undervoltage detection and control module is used to receive the output voltage of the power supply, and when the output voltage is greater than the second preset value, transmit the output voltage of the power supply to the switching module and the voltage limiting module; and

[0029] When the output voltage is less than a second preset value, the transmission of the power supply output voltage is stopped, wherein the second preset value is less than the first preset value.

[0030] Optionally, the undervoltage detection and control module includes an undervoltage detection unit and a second switching unit;

[0031] The undervoltage detection unit is connected to the second switch unit and the switch module respectively. The second switch unit is connected to the switch module and the voltage limiting module respectively. The second switch unit and the undervoltage detection unit are also used to connect to the power supply.

[0032] The undervoltage detection unit receives the output voltage of the power supply and outputs a power signal to the second switching unit when the output voltage is greater than a second preset voltage, so that the second switching unit is turned on based on the power signal, thereby transmitting the output voltage of the power supply to the switching module and the voltage limiting module; and

[0033] When the output voltage is less than the second preset voltage, the power signal is stopped from being output, so that the second switching unit is turned off, thereby stopping the transmission of the output voltage.

[0034] Optionally, the second switching unit includes a switching transistor Q2, a switching transistor Q4, a resistor R4, a resistor R5, and a resistor R6;

[0035] The control terminal of the switch Q2 is connected to the undervoltage detection unit through the resistor R4. The first terminal of the switch Q2 is connected to the control terminal of the switch Q4 through the resistor R6. The second terminal of the switch Q2 is used for grounding. The control terminal of the switch Q4 is also connected to the first terminal of the switch Q4 through the resistor R5. The first terminal of the switch Q4 is connected to the power supply. The second terminal of the switch Q4 is connected to the switch module and the voltage limiting module respectively.

[0036] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is: to provide an energy storage system, the energy storage system comprising:

[0037] load;

[0038] Power supply; and

[0039] The voltage control circuit described above.

[0040] Unlike related technologies, this utility model provides a voltage control circuit and an energy storage system. The voltage control circuit includes a detection module, a switching module, and a voltage limiting module. The detection module is connected to the switching module, which is used to connect a power supply and a load. The voltage limiting module is connected in parallel with the switching module, and the detection module is also connected to the power supply. The detection module detects the output voltage of the power supply. If the output voltage is less than a first preset value, the output voltage of the power supply is considered to be within the normal range. In this case, the detection module will not output a control signal, and the switching module will conduct based on the output voltage, thereby transmitting the output voltage to the load. If the output voltage is greater than the first preset value, the output voltage of the power supply is considered to be too high. In this case, the detection module will output a control signal to the switching module to disconnect the switching module, thereby allowing the output voltage of the power supply to be input to the voltage limiting module. After receiving the output voltage, the voltage limiting module will limit the output voltage to a preset range before outputting it to the load, so as to avoid excessive voltage causing losses to the load, thereby improving the reliability of the energy storage system. [Attached Image Description]

[0042] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0043] Figure 1 This is a structural block diagram of an energy storage system provided in an embodiment of the present invention;

[0044] Figure 2 This is a circuit diagram of a buck converter provided in an embodiment of the present invention;

[0045] Figure 3 This is a structural block diagram of a voltage control circuit provided in an embodiment of the present invention;

[0046] Figure 4 This is a circuit diagram of a voltage control circuit provided in an embodiment of the present invention;

[0047] Figure 5 This is a structural block diagram of a voltage control circuit provided in another embodiment of the present invention;

[0048] Figure 6This is a circuit diagram of a voltage control circuit provided in another embodiment of the present invention. 【Detailed Implementation Methods】

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Please see Figure 1 , Figure 1 This is a structural block diagram of an energy storage system provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the energy storage system 100 includes a power supply 10, a load 20, and a voltage control circuit 30; the voltage control circuit 30 is connected to both the power supply 10 and the load 20. The power supply 10 outputs voltage to the load 20 through the voltage control circuit 30 to supply power to the load 20. When the voltage control circuit 30 receives the output voltage from the power supply 10, it detects the output voltage and limits it to a preset range if the output voltage exceeds a first preset value, thereby preventing excessive output voltage from damaging the load 20 and thus extending the service life of the energy storage system 100.

[0056] In some embodiments, the load 20 may be a converter or any other electrical device. The converter may be a boost converter or a buck converter.

[0057] Please refer to Figure 2 , Figure 2 This is a circuit diagram of a buck converter provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the buck converter includes a switch Q6, an inductor LD1, a diode DS1, and a capacitor C1. The converter primarily achieves its buck function by changing the voltage stored in the inductor LD1 through the switching of the switch Q6. However, when the input voltage to the switch Q6 is too high, its duty cycle decreases, increasing switching losses and output voltage ripple. Therefore, to avoid the problems caused by a low duty cycle, the input voltage to the switch Q6 needs to be limited. In summary, this embodiment connects the voltage control circuit 30 to the load 20 and limits the output voltage within a preset range when the output voltage of the power supply 10 exceeds a first preset value. This prevents excessive voltage input to the switch Q6, thus increasing the duty cycle and reducing the impact on the load 20.

[0058] Furthermore, in some embodiments, please refer to Figure 3 , Figure 3 This is a structural block diagram of a voltage control circuit provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the voltage control circuit 30 includes a detection module 31, a switching module 32, and a voltage limiting module 33;

[0059] The detection module 31 is connected to the switch module 32. The switch module 32 is used to connect the power supply 10 and the load 20 respectively. The voltage limiting module 33 is connected in parallel with the switch module 32. The detection module 31 is also used to connect to the power supply 10.

[0060] The detection module 31 is used to detect the output voltage of the power supply 10, and output a control signal when the output voltage is greater than a first preset value;

[0061] The switching module 32 is used to transmit the output voltage to the load 20 when the control signal is not received, based on the output voltage of the power supply 10; and

[0062] Turn off upon receiving the control signal;

[0063] The voltage limiting module 33 is used to limit the output voltage within a preset range when the switch module 32 is turned off, and to output the limited output voltage to the load 20.

[0064] Specifically, when the energy storage system 100 starts working, the power supply 10 outputs voltage to the detection module 31, the switch module 32, and the voltage limiting module 33. When the detection module 31 receives the output voltage, it determines whether the output voltage is greater than a first preset value. If the output voltage is greater than the first preset value, it outputs a control signal to the switch module 32; otherwise, if the output voltage is less than the first preset value, it does not output a control signal. When the switch module 32 does not receive the control signal, it receives the output voltage of the power supply 10 and turns on according to the output voltage, allowing the power supply 10 to supply power to the load 20 through the switch module 32. When the switch module 32 receives the control signal, it turns off according to the control signal. At this time, the voltage limiting module 33 receives the output voltage of the power supply 10 and limits the output voltage within a preset range before outputting it to the load 20 to avoid damage to the load 20 due to excessive voltage.

[0065] In yet another embodiment, such as Figure 3 As shown, the switch module 32 includes a control unit 321 and a first switch unit 322;

[0066] The control unit 321 is connected to the first switch unit 322 and the detection module 31 respectively. The control unit 321 is also used to connect to the power supply 10. The first switch unit 322 is used to connect to the power supply 10 and the load 20 respectively.

[0067] The control unit 321 is used to receive the output voltage and, when no control signal is received, to start working according to the output voltage to control the first switching unit 322 to be turned on; and

[0068] Upon receiving the control signal, the device stops operating according to the control signal, thereby turning off the first switching unit 322.

[0069] Specifically, when the output voltage of the power supply 10 is less than a first preset value, the detection module 31 will not output a control signal. At this time, the control unit 321 will receive the output voltage and start working according to the output voltage, thereby controlling the first switching unit 322 to turn on. When the first switching unit 322 is turned on, the output voltage of the power supply 10 will be output to the load 20 through the first switching unit 322, thereby supplying power to the load 20.

[0070] When the output voltage exceeds the first preset value, the detection module 31 outputs a control signal. Upon receiving the control signal, the control unit 321 stops operating, thereby turning off the first switching unit 322 and allowing the output voltage to be input to the voltage limiting module 33.

[0071] In another embodiment, please refer to Figure 4 , Figure 4 This is a circuit diagram of a voltage control circuit provided in an embodiment of this utility model, as shown below. Figure 4 As shown, the control unit 321 includes resistors R3 and R7 and a switching transistor Q3; the first switching unit 322 includes a switching transistor Q5, resistors R8 and R9;

[0072] The switching transistor Q3 is connected to the detection module 31 and the resistor R7 respectively. The resistor R7 is connected to the power supply 10. The first end of the switching transistor Q3 is connected to the first switching unit 322, and the second end of the switching transistor Q3 is used for grounding.

[0073] The control terminal of the switch Q5 is connected to the control unit 321 through the resistor R9. The control terminal of the switch Q5 is also connected to the first terminal of the switch Q5 through the resistor R8. The first terminal of the switch Q5 is also connected to the power supply 10. The second terminal of the switch Q5 is connected to the load 20.

[0074] When the detection module 31 does not output the control signal, the output voltage of the power supply 10 is input to the control terminal of the switch Q3 through resistors R3 and R7, causing the switch Q3 to conduct. When the switch Q3 is conducted, the voltage at the control terminal of the switch Q5 is pulled low through resistor R9, thereby causing the switch Q5 to conduct. When the switch Q5 is conducted, the output voltage of the power supply 10 is output to the load 20 through the switch Q5. When the detection module 31 outputs the control signal, the switch Q3 receives the control signal through resistor R7 and turns off according to the control signal, thereby causing the switch Q5 to turn off as well.

[0075] Furthermore, in yet another embodiment, such as Figure 4 As shown, the voltage limiting module 33 is a Zener diode DZ3; the cathode of the Zener diode ZD3 is connected to the power supply 10, and the anode of the Zener diode ZD3 is connected to the load 20.

[0076] Specifically, when the output voltage exceeds the first preset value, the switching transistor Q5 is turned off. At this time, the output voltage of the power supply 10 is input to the Zener diode ZD3, causing it to break down. After the Zener diode ZD3 breaks down, the output voltage of the power supply 10 is stepped down by the Zener diode ZD3 (i.e., the output voltage is limited to a preset range). The maximum value of the preset range is determined based on the Zener voltage of the Zener diode ZD3, which is set according to the first preset value.

[0077] In other embodiments, such as Figure 4 As shown, the detection module 31 includes a Zener diode ZD1, a resistor R1, a resistor R2, and a switching transistor Q1;

[0078] The cathode of the Zener diode ZD1 is connected to the power supply 10, the anode of the Zener diode ZD1 is connected to the control terminal of the switch Q1 through the resistor R1, the control terminal of the switch Q1 is also grounded through the resistor R2, the first terminal of the switch Q1 is connected to the switch module 32, and the second terminal of the switch Q1 is used for grounding.

[0079] Specifically, when the power supply 10 outputs a voltage, the Zener diode ZD1 receives the output voltage and confirms that the output voltage is greater than the first preset value when the output voltage is greater than the Zener diode ZD1's regulated voltage value. At this time, the Zener diode ZD1 breaks down, and the output voltage is input to the control terminal of the switch Q1 through the Zener diode ZD1 and resistor R1, causing the switch Q1 to conduct. When the switch Q1 is conducted, the voltage at the control terminal of the switch Q3 is pulled low (receiving a control signal), and the switch Q3 is turned off, thereby causing the switch Q5 to also be turned off, that is, the switching module 32 is turned off. At this time, the output voltage is output through the voltage limiting module 33.

[0080] In some embodiments, to prevent the power supply 10 from experiencing power depletion, the voltage control circuit 30 further includes an undervoltage detection control module 34. This module detects the output voltage of the power supply 10 and shuts off the output when the output voltage is lower than a second preset value, thereby achieving undervoltage protection. (See also...) Figure 5 , Figure 5 This is a structural block diagram of a voltage control circuit provided in another embodiment of the present invention, as shown below. Figure 5 As shown, the voltage control circuit 30 also includes an undervoltage detection control module 34;

[0081] The undervoltage detection and control module 34 is connected to the switch module 32 and the voltage limiting module 33 respectively, and the undervoltage detection and control module 34 is also used to connect to the power supply 10;

[0082] The undervoltage detection control module 34 is used to receive the output voltage of the power supply 10, and to stop transmitting the output voltage of the power supply 10 when the output voltage is less than a second preset value; and

[0083] When the output voltage is greater than the second preset value, the output voltage of the power supply 10 is transmitted to the switch module 32 and the voltage limiting module 33, wherein the second preset value is less than the first preset value.

[0084] Specifically, when the power supply 10 outputs voltage, the undervoltage detection control module 34 receives and detects the output voltage. When the output voltage is less than the second preset value, it stops working and stops transmitting the output voltage to avoid the power supply 10 experiencing undervoltage. When the output voltage is greater than the second preset value, the output voltage of the power supply 10 is output to the switch module 32 and the voltage limiting module 33 respectively, so that the output voltage can be output through the switch module 32 or the voltage limiting module 33.

[0085] In yet another embodiment, such as Figure 5 As shown, the undervoltage detection control module 34 includes an undervoltage detection unit 341 and a second switching unit 342;

[0086] The undervoltage detection unit 341 is connected to the second switch unit 342 and the switch module 32 respectively. The second switch unit 342 is connected to the switch module 32 and the voltage limiting module 33 respectively. The second switch unit 342 and the undervoltage detection unit 341 are also used to connect to the power supply 10.

[0087] The undervoltage detection unit 341 is used to receive the output voltage of the power supply 10, and when the output voltage is greater than a second preset voltage, output a power signal to the second switching unit 342, so that the second switching unit 342 is turned on based on the power signal, thereby transmitting the output voltage of the power supply 10 to the switching module 32 and the voltage limiting module 33; and

[0088] When the output voltage is less than the second preset voltage, the power signal is stopped from being output, so that the second switching unit 342 is turned off, thereby stopping the transmission of the output voltage.

[0089] Specifically, when the power supply 10 outputs voltage, the undervoltage detection unit 341 also receives the output voltage and detects whether the output voltage is greater than a second preset value. If the output voltage is greater than the second preset value, the undervoltage detection unit 341 outputs a power signal to the second switching unit 342 to turn on the second switching unit 342. When the second switching unit 342 is turned on, the output voltage is output to the switching module 32 and the voltage limiting module 33. If the output voltage is less than the second preset value, the power supply 10 is considered to be in an undervoltage state. At this time, the undervoltage detection unit 341 stops outputting a power signal to the second switching unit 342, thereby turning off the second switching unit 342 and causing the power supply 10 to stop outputting, thus preventing the power supply 10 from being over-discharged.

[0090] When the undervoltage detection unit 341 detects that the output voltage is greater than the second preset value, the undervoltage detection unit 341 will also output the power signal to the control unit 321, so that the control unit 321 can start working according to the power signal when it does not receive the control signal.

[0091] In yet another embodiment, please refer to Figure 6 , Figure 6 This is a circuit diagram of a voltage control circuit provided in another embodiment of the present invention, as shown below. Figure 6 As shown, the undervoltage detection unit 341 is a Zener diode DZ2; the second switching unit 342 includes a switching transistor Q2, a switching transistor Q4, a resistor R4, a resistor R5, and a resistor R6;

[0092] The cathode of the Zener diode DZ2 is connected to the power supply 10, and the anode of the Zener diode DZ2 is connected to the control unit 321 and the second switching unit 342 respectively.

[0093] The control terminal of the switch Q2 is connected to the undervoltage detection unit 341 through the resistor R4. The first terminal of the switch Q2 is connected to the control terminal of the switch Q4 through the resistor R6. The second terminal of the switch Q2 is used for grounding. The control terminal of the switch Q4 is also connected to the first terminal of the switch Q4 through the resistor R5. The first terminal of the switch Q4 is connected to the power supply 10. The second terminal of the switch Q4 is connected to the switch module 32 and the voltage limiting module 33 respectively.

[0094] When the power supply 10 outputs a voltage, the Zener diode ZD2 receives the output voltage. If the output voltage is greater than the Zener diode ZD2's regulated voltage value (second preset value), the Zener diode ZD2 breaks down, thereby outputting a power signal to the control unit 321 and the control terminal of the switching transistor Q2. When the switching transistor Q2 receives the power signal, it turns on according to the power signal, and the switching transistor Q4 also turns on, so that the output voltage can be input to the first switching unit 322 or the voltage limiting module 33. If the output voltage is less than the Zener diode ZD2's regulated voltage value, the Zener diode ZD2 turns off, and the switching transistors Q2 and Q4 also turn off. When the switching transistor Q4 turns off, the output voltage of the power supply 10 stops, thereby achieving undervoltage protection.

[0095] In another embodiment, such as Figure 6 As shown, when the power supply 10 (V) in After the output voltage is received, both Zener diodes ZD1 and ZD2 will receive the output voltage. When the output voltage is greater than a second preset value, Zener diode ZD2 will break down, and both switching transistors Q2 and Q4 will turn on. When the output voltage is less than a first preset value, the power signal will be input to the control terminal of switching transistor Q3 through resistor R3, thereby turning on switching transistor Q3 and Q5. At this time, the output voltage of the power supply 10 will be input to switching transistor Q6 through switching transistors Q4 and Q5. If the output voltage is greater than the first preset value, Zener diode ZD1 will break down, switching transistor Q1 will turn on, the voltage at the second terminal of resistor R3 will be pulled low, and switching transistors Q3 and Q5 will turn off. At this time, the output voltage transmitted by the switch Q4 will break down the Zener diode ZD3, thereby limiting the output voltage to a preset range and outputting it to the switch Q6. This avoids the loss of the switch Q6 due to the reduced duty cycle caused by the excessively high output voltage, and improves the reliability of the energy storage system 100.

[0096] This utility model embodiment provides a voltage control circuit, which includes a detection module, a switching module, and a voltage limiting module. The detection module is connected to the switching module, which is used to connect a power supply and a load. The voltage limiting module is connected in parallel with the switching module, and the detection module is also connected to the power supply. The detection module detects the output voltage of the power supply. If the output voltage is less than a first preset value, the output voltage of the power supply is considered to be within the normal range. In this case, the detection module will not output a control signal, and the switching module will conduct based on the output voltage, thereby transmitting the output voltage to the load. If the output voltage is greater than the first preset value, the output voltage of the power supply is considered to be too high. In this case, the detection module will output a control signal to the switching module to disconnect the switching module, thereby allowing the output voltage of the power supply to be input to the voltage limiting module. After receiving the output voltage, the voltage limiting module will limit the output voltage to a preset range before outputting it to the load, so as to avoid the loss of the load due to excessive voltage, thereby improving the reliability of the energy storage system.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above, which are not provided in detail for the sake of brevity; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A voltage control circuit, characterized in that, The voltage control circuit includes a detection module, a switching module, and a voltage limiting module; The detection module is connected to the switch module, and the switch module is used to connect the power supply and the load respectively. The voltage limiting module is connected in parallel with the switch module, and the detection module is also used to connect to the power supply. The detection module is used to detect the output voltage of the power supply and output a control signal when the output voltage is greater than a first preset value. The switching module is used to turn on according to the output voltage of the power supply when no control signal is received, thereby transmitting the output voltage to the load; as well as Turn off upon receiving the control signal; The voltage limiting module is used to limit the output voltage to a preset range when the switching module is turned off, and to output the limited output voltage to the load.

2. The voltage control circuit according to claim 1, characterized in that, The switching module includes a control unit and a first switching unit; The control unit is connected to the first switching unit and the detection module respectively. The control unit is also used to connect to the power supply. The first switching unit is used to connect to the power supply and the load respectively. The control unit is used to receive the output voltage and, when no control signal is received, to start working according to the output voltage to control the first switching unit to be turned on; as well as Upon receiving the control signal, the device stops operating according to the control signal, thereby turning off the first switching unit.

3. The voltage control circuit according to claim 2, characterized in that, The control unit includes resistor R3, resistor R7, and switching transistor Q3; The switching transistor Q3 is connected to the detection module and the resistor R7 respectively. The resistor R3 is connected to the power supply. The first end of the switching transistor Q3 is connected to the first switching unit, and the second end of the switching transistor Q3 is used for grounding.

4. The voltage control circuit according to claim 2, characterized in that, The first switching unit includes a switching transistor Q5, a resistor R8, and a resistor R9; The control terminal of the switch Q5 is connected to the control unit through the resistor R9. The control terminal of the switch Q5 is also connected to the first terminal of the switch Q5 through the resistor R8. The first terminal of the switch Q5 is also connected to the power supply. The second terminal of the switch Q5 is connected to the load.

5. The voltage control circuit according to claim 1, characterized in that, The detection module includes a Zener diode ZD1, a resistor R1, a resistor R2, and a switching transistor Q1; The cathode of the Zener diode ZD1 is connected to the power supply, and the anode of the Zener diode ZD1 is connected to the control terminal of the switch Q1 through the resistor R1. The control terminal of the switch Q1 is also grounded through the resistor R2. The first terminal of the switch Q1 is connected to the switch module, and the second terminal of the switch Q1 is used for grounding.

6. The voltage control circuit according to any one of claims 1-5, characterized in that, The voltage limiting module is a Zener diode DZ3; The cathode of the Zener diode ZD3 is connected to the power supply, and the anode of the Zener diode ZD3 is connected to the load.

7. The voltage control circuit according to claim 1, characterized in that, The voltage control circuit also includes an undervoltage detection and control module; The undervoltage detection and control module is connected to the switch module and the voltage limiting module respectively, and the undervoltage detection and control module is also used to connect to the power supply. The undervoltage detection and control module is used to receive the output voltage of the power supply, and when the output voltage is greater than the second preset value, transmit the output voltage of the power supply to the switching module and the voltage limiting module; as well as When the output voltage is less than a second preset value, the transmission of the power supply output voltage is stopped, wherein the second preset value is less than the first preset value.

8. The voltage control circuit according to claim 7, characterized in that, The undervoltage detection and control module includes an undervoltage detection unit and a second switching unit. The undervoltage detection unit is connected to the second switch unit and the switch module respectively. The second switch unit is connected to the switch module and the voltage limiting module respectively. The second switch unit and the undervoltage detection unit are also used to connect to the power supply. The undervoltage detection unit is used to receive the output voltage of the power supply, and when the output voltage is greater than the second preset voltage, it outputs a power signal to the second switching unit, so that the second switching unit is turned on based on the power signal, thereby transmitting the output voltage of the power supply to the switching module and the voltage limiting module; as well as When the output voltage is less than the second preset voltage, the power signal is stopped from being output, so that the second switching unit is turned off, thereby stopping the transmission of the output voltage.

9. The voltage control circuit according to claim 8, characterized in that, The second switching unit includes a switching transistor Q2, a switching transistor Q4, a resistor R4, a resistor R5, and a resistor R6; The control terminal of the switch Q2 is connected to the undervoltage detection unit through the resistor R4. The first terminal of the switch Q2 is connected to the control terminal of the switch Q4 through the resistor R6. The second terminal of the switch Q2 is used for grounding. The control terminal of the switch Q4 is also connected to the first terminal of the switch Q4 through the resistor R5. The first terminal of the switch Q4 is connected to the power supply. The second terminal of the switch Q4 is connected to the switch module and the voltage limiting module respectively.

10. An energy storage system, characterized in that, The energy storage system includes: load; Power supply; and The voltage control circuit as described in any one of claims 1-9.

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