Capacitor soft starting circuit and energy storage power supply

Abstract

The utility model relates to the technical field of energy storage power supplies, and mainly provides a capacitor soft start circuit and an energy storage power supply, the circuit comprises a switch module, a charging module and a pre-charging resistor which are respectively connected with the switch module, and an energy storage capacitor which is connected with the pre-charging resistor and the charging module, and the switch module is also connected with a power supply; the switch module is used for starting to work according to the activation signal after receiving the activation signal so as to output the power supply voltage of the power supply; the pre-charging resistor is used for receiving power supply voltage and charging the energy storage capacitor according to the power supply voltage, so that instantaneous current generated when the power supply charges the energy storage capacitor is limited, and devices in the circuit are protected from being damaged. And in the process that the pre-charging resistor charges the energy storage capacitor, the charging module detects the capacitor voltage of the energy storage capacitor in real time and starts to work when the capacitor voltage is greater than the preset voltage, so that the charging module replaces the pre-charging resistor to charge the energy storage capacitor, the loss in the circuit is reduced, and the stability and reliability of the system are improved.

Description

[Technical Field]

[0001] This utility model relates to the technical field of energy storage power supplies, and in particular to a capacitor soft start circuit and an energy storage power supply. [Background Technology]

[0002] When a capacitor is charging, a very large instantaneous current is often generated. If this large current is not controlled, it will cause the power supply output voltage to drop instantly, affecting the normal operation of other circuit modules, and may even damage the power supply itself.

[0003] To address this issue, existing technology utilizes resistors to limit the instantaneous current and charging time of the capacitor. When charging the capacitor at the power supply end, a switch is needed to control the charging time for precise control. To protect the switch from the impact of instantaneous high current, a resistor is typically added to limit the current peak. However, an excessively large resistor will prolong the capacitor charging time, potentially preventing the auxiliary power source from activating, thus affecting the normal startup and operation of the entire system. Furthermore, even after the capacitor is fully charged, the resistor continues to consume power, resulting in significant energy loss and potential damage. Conversely, an excessively small resistor cannot effectively limit the current peak, leading to an excessively large inrush current. This can overwhelm the power transistors and resistors, easily damaging these components and causing the entire charging circuit to malfunction, impacting the system's stability and reliability. [Utility Model Content]

[0004] This utility model provides a capacitor soft-start circuit and an energy storage power supply, aiming to solve the technical problems of difficulty in determining the value of the pre-charge resistance and low system reliability in the existing energy storage power supply.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is: to provide a capacitor soft start circuit, the capacitor soft start circuit including a switching module, a charging module, a pre-charging resistor and an energy storage capacitor;

[0006] The switching module is connected to the power supply, and is also connected to the charging module and the pre-charging resistor respectively. The pre-charging resistor and the charging module are also connected to the energy storage capacitor. The switching module is also used to receive activation signals.

[0007] The switching module is used to start working according to the activation signal after receiving the activation signal, so as to output the power supply voltage of the power supply.

[0008] The pre-charge resistor is used to receive the power supply voltage of the power supply and to charge the energy storage capacitor according to the power supply voltage.

[0009] The charging module is used to detect the capacitor voltage of the energy storage capacitor in real time, and starts working when the capacitor voltage is greater than a preset voltage, so that the power supply charges the energy storage capacitor through the charging module.

[0010] Optionally, the switching module includes a control unit and a switching unit;

[0011] The control unit is connected to the switching unit, the switching unit is connected to the pre-charge resistor and the charging module respectively, the switching unit is also used to connect to the power supply, and the control unit is also used to receive the activation signal;

[0012] The control unit is used to start working after receiving an activation signal and output a control signal to the switching unit;

[0013] The switching unit is used to start working after receiving the control signal, thereby outputting the power supply voltage of the power supply.

[0014] Optionally, the control unit includes a switch Q1, a resistor R3, a resistor R4, and a capacitor C1;

[0015] The control terminal of the switch Q1 receives the activation signal through the resistor R3. The control terminal of the switch Q1 is also grounded through the resistor R4. The capacitor C1 is connected in parallel with the resistor R4. The first terminal of the switch Q1 is connected to the switching unit, and the second terminal of the switch Q1 is used for grounding.

[0016] Optionally, the switching unit includes a switching transistor Q2, a resistor R1, and a resistor R2;

[0017] The control terminal of the switch Q2 is connected to the first terminal of the switch Q1 through the resistor R2. The first terminal of the switch Q2 is also connected to the resistor R2 through the resistor R1. The first terminal of the switch Q2 is also connected to the power supply. The second terminal of the switch Q2 is connected to the pre-charge resistor and the charging module respectively.

[0018] Optionally, the charging module includes a detection unit, a driving unit, and a charging unit;

[0019] The detection unit is connected to the energy storage capacitor and the driving unit respectively, the driving unit is connected to the charging unit, and the charging unit is connected in parallel with the pre-charge resistor;

[0020] The detection unit is used to detect the capacitor voltage in the energy storage capacitor in real time, and outputs a drive signal to the drive unit when the capacitor voltage is greater than the preset voltage;

[0021] The driving unit is used to start working after receiving the driving signal to control the charging unit to be turned on, so that the power supply charges the energy storage capacitor through the charging unit.

[0022] Optionally, the detection unit includes a Zener diode DZ1 and a resistor R7;

[0023] The cathode of the Zener diode DZ1 is connected to the energy storage capacitor through the resistor R7, and the anode of the Zener diode DZ1 is connected to the drive unit.

[0024] Optionally, the driving unit includes a switching transistor Q4, a capacitor C2, a resistor R5, and a resistor R8;

[0025] The control terminal of the switching transistor Q4 is connected to the anode of the Zener diode DZ1. The control terminal of the switching transistor Q4 is also grounded through the capacitor C2. The first terminal of the switching transistor Q4 is connected to the resistor R5 through the resistor R8. The resistor R5 is also connected to the switching module. The second terminal of the switching transistor Q4 is also used for grounding.

[0026] Optionally, the charging unit includes a switching transistor Q3;

[0027] The control terminal of the switch Q3 is connected to the resistor R8, the first terminal of the switch Q3 is connected to the switch module, and the second terminal of the switch Q3 is connected to the energy storage capacitor.

[0028] Optionally, the switch module further includes a fuse F1;

[0029] The fuse F1 is connected to both the power supply and the switching unit.

[0030] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is: to provide an energy storage power source, the energy storage power source comprising:

[0031] Power supply; and

[0032] The capacitor soft-start circuit described above.

[0033] Unlike related technologies, this utility model provides a capacitor soft-start circuit and an energy storage power supply. The circuit includes a switching module, a charging module, a pre-charging resistor, and an energy storage capacitor. The switching module is connected to the power supply and is also connected to the charging module and the pre-charging resistor. Both the pre-charging resistor and the charging module are connected to the energy storage capacitor. The switching module also receives an activation signal. Upon receiving the activation signal, the switching module starts operating to output the power supply voltage. The pre-charging resistor receives the power supply voltage and charges the energy storage capacitor accordingly, thereby limiting the instantaneous current during charging and protecting the circuit components from damage. During the charging process, the charging module continuously monitors the energy storage capacitor's voltage and starts operating when the voltage exceeds a preset value. This allows the charging module to replace the pre-charging resistor in charging the energy storage capacitor, reducing circuit losses and improving system stability and reliability. [Attached Image Description]

[0034] 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.

[0035] Figure 1 This is a structural block diagram of an energy storage power supply provided in an embodiment of this utility model;

[0036] Figure 2 This is a structural block diagram of a capacitor soft-start circuit provided in an embodiment of the present invention;

[0037] Figure 3 This is a circuit diagram of a capacitor soft-start circuit provided in an embodiment of this utility model.

Detailed Implementation Methods

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Please see Figure 1 , Figure 1 This is a structural block diagram of an energy storage power supply provided in an embodiment of this utility model, as shown below. Figure 1 As shown, the energy storage power supply 100 includes a power supply 10 and a capacitor soft-start circuit 20; the power supply 10 is connected to the capacitor soft-start circuit 20. The capacitor soft-start circuit 20 is used to receive an activation signal and start working according to the activation signal to receive and store the power supply voltage of the power supply 10.

[0044] In some embodiments, such as Figure 1As shown, the energy storage power supply 100 also includes a power-consuming device 30, which is connected to the capacitor soft-start circuit 20. The power-consuming device 30 receives the voltage stored in the capacitor soft-start circuit 20 and begins operation when the stored voltage exceeds a certain value. It should be noted that when the power supply 10 starts outputting voltage, if the capacitor soft-start circuit 20 is not present, the power supply voltage of the power supply 10 will be directly input to the power-consuming device 30. Because there is a large voltage difference between the power supply 10 and the power-consuming device 30, the power-consuming device 30 will receive an inrush current output by the power supply 10, potentially causing damage to the power-consuming device 30. Therefore, by receiving and storing the power supply voltage output by the power supply 10 through the capacitor soft-start circuit 20, the voltage received by the electrical device 30 rises slowly and starts working after exceeding a certain value. This means the peak current in the main circuit from the power supply 10 to the energy storage capacitor is divided into two operating states, effectively suppressing peak currents and preventing damage to the electrical device 30 due to inrush current. Optionally, the electrical device 30 can be a load or an auxiliary power supply circuit, etc.

[0045] In yet another embodiment, such as Figure 1 As shown, the energy storage power supply 100 also includes a controller 40, which is connected to the capacitor soft-start circuit 20. The controller 40 outputs an activation signal to the capacitor soft-start circuit 20, causing the capacitor soft-start circuit 20 to start working according to the activation signal. In another embodiment, the capacitor soft-start circuit 20 can also receive the activation signal through other means, such as a button or a signal source. When the user presses the button or the signal source outputs a voltage signal, it is considered that the capacitor soft-start circuit 20 has received the activation signal.

[0046] Please see Figure 2 , Figure 2 This is a structural block diagram of a capacitor soft-start circuit provided in an embodiment of this utility model, as shown below. Figure 2 As shown, the capacitor soft-start circuit 20 includes a switching module 21, a charging module 22, a pre-charging resistor R6, and an energy storage capacitor C3.

[0047] The switching module 21 is connected to the power supply 10. The switching module 21 is also connected to the charging module 22 and the pre-charging resistor R6 respectively. The pre-charging resistor R6 and the charging module 22 are also connected to the energy storage capacitor C3. The switching module 21 is also used to receive activation signals.

[0048] The switching module 21 is used to start working according to the activation signal after receiving the activation signal, so as to output the power supply voltage of the power supply 10;

[0049] The pre-charging resistor R6 is used to receive the power supply voltage of the power supply 10 and to charge the energy storage capacitor C3 according to the power supply voltage.

[0050] The charging module 22 is used to detect the capacitor voltage of the energy storage capacitor C3 in real time, and starts working when the capacitor voltage is greater than a preset voltage, so that the power supply 10 charges the energy storage capacitor C3 through the charging module 22.

[0051] Specifically, when the power supply 10 needs to output power voltage, the switching module 21 receives the activation signal and starts working based on the activation signal, thereby outputting the power supply voltage of the power supply 10. However, at the instant the switching module 21 outputs the power voltage, its inrush current is large. If the power voltage is directly input to the energy storage capacitor C3 at this moment, it will cause damage to the energy storage capacitor C3. Therefore, after the switching module 21 outputs the power voltage, the pre-charging resistor R6 receives the power voltage and inputs it to the energy storage capacitor C3 to charge it. It should be noted that because the resistance of the pre-charging resistor R6 is high, when the switching module 21 outputs the power voltage, the pre-charging resistor R6 will consume a portion of the voltage, thereby preventing a large voltage from being directly input to the energy storage capacitor C3 and causing damage to it.

[0052] As the energy storage capacitor C3 continues to charge based on the pre-charging resistor R6, the voltage drop between the energy storage capacitor C3 and the power supply 10 decreases. If the energy storage capacitor C3 continues to be charged through the pre-charging resistor R6, it will result in high losses. Therefore, to improve voltage utilization and charging rate, the charging module 22 continuously monitors the voltage stored in the energy storage capacitor C3. When the voltage exceeds a preset voltage, it determines that the voltage drop between the energy storage capacitor C3 and the power supply 10 is small. At this point, the charging module 22 starts operating and inputs the power supply voltage from the power supply 10 to the energy storage capacitor C3 to charge it. It should be noted that after the charging module 22 starts operating, the power supply 10 begins charging the energy storage capacitor C3 based on the charging module 22, and the current flowing into the pre-charging resistor R6 is very small, thereby reducing power supply voltage losses.

[0053] In yet another embodiment, such as Figure 2 As shown, the switch module 21 includes a control unit 211 and a switch unit 212;

[0054] The control unit 211 is connected to the switch unit 212. The switch unit 212 is connected to the pre-charge resistor R6 and the charging module 22 respectively. The switch unit 212 is also used to connect to the power supply 10. The control unit 211 is also used to receive the activation signal.

[0055] The control unit 211 is used to start working after receiving the activation signal and output a control signal to the switching unit 212;

[0056] The switching unit 212 is used to start working after receiving the control signal, thereby outputting the power supply voltage of the power supply 10.

[0057] Specifically, the switch module 21 is mainly used to control whether to output the power supply voltage of the power supply 10. When it is necessary to output the power supply voltage of the power supply 10, the control unit 211 receives the activation signal and starts working based on the activation signal, thereby outputting a control signal to the switch unit 212. After receiving the control signal, the switch unit 212 starts working based on the control signal, thereby outputting the power supply voltage.

[0058] In another embodiment, please refer to Figure 3 , Figure 3 This is a circuit diagram of a capacitor soft-start circuit provided in an embodiment of this utility model, as shown below. Figure 3 As shown, the control unit 211 includes a switch Q1, a resistor R3, a resistor R4, and a capacitor C1; the switching unit 212 includes a switch Q2, a resistor R1, and a resistor R2.

[0059] The control terminal of the switch Q1 receives the activation signal through the resistor R3. The control terminal of the switch Q1 is also grounded through the resistor R4. The capacitor C1 is connected in parallel with the resistor R4. The first terminal of the switch Q1 is connected to the switch unit 212, and the second terminal of the switch Q1 is used for grounding.

[0060] The control terminal of the switch Q2 is connected to the first terminal of the switch Q1 through the resistor R2. The first terminal of the switch Q2 is also connected to the resistor R2 through the resistor R1. The first terminal of the switch Q2 is also connected to the power supply 10. The second terminal of the switch Q2 is connected to the pre-charge resistor R6 and the charging module 22 respectively.

[0061] Specifically, when the switch Q1 receives the activation signal through the resistor R3, the switch Q1 will turn on based on the activation signal. At this time, the voltage at the second terminal of the resistor R2 is pulled low, and the resistors R1 and R2 begin to divide the voltage, causing the switch Q2 to turn on due to the voltage drop. When the switch Q2 is turned on, the power supply voltage of the power supply 10 (V-BAT) will be output through the switch Q2.

[0062] In some embodiments, such as Figure 3 As shown, the control unit 211 further includes a diode D1. The cathode of diode D1 is connected to the resistor R3, and the anode of diode D1 is used to connect to an activation signal source WAKE_BUTTON to receive an activation signal. Diode D1 is used to prevent the power supply voltage from flowing back to the controller / signal source through the switch Q1 when the switch Q1 is turned on. In another embodiment, the switch module 21 can also be connected to a controller, signal source, or button, etc., thereby enabling the switch module 21 to be controlled under different conditions. Figure 3 As shown, the control unit 211 also includes a diode D2, the anode of which is connected to another activation signal source WAKE_ON / OFF, and the diode D2 is used to prevent the power supply voltage from flowing back to the controller / signal source through the switch Q1 when the switch Q1 is turned on.

[0063] In yet another embodiment, such as Figure 3 As shown, the switch module 21 also includes a fuse F1; the fuse F1 is connected to both the power supply 10 and the switch unit 21. The fuse F1 is used to protect the capacitor soft-start circuit 20 when the power supply voltage of the power supply 10 is too high, thereby improving the reliability of the capacitor soft-start circuit 20.

[0064] In some embodiments, such as Figure 2 As shown, the charging module 22 includes a detection unit 221, a driving unit 222, and a charging unit 223;

[0065] The detection unit 221 is connected to the energy storage capacitor C3 and the driving unit 222 respectively. The driving unit 222 is connected to the charging unit 223. The charging unit 223 is connected in parallel with the pre-charging resistor R6.

[0066] The detection unit 221 is used to detect the capacitor voltage in the energy storage capacitor C3 in real time, and output a drive signal to the drive unit 222 when the capacitor voltage is greater than the preset voltage.

[0067] The driving unit 222 is used to start working after receiving the driving signal to control the charging unit 223 to be turned on, so that the power supply 10 charges the energy storage capacitor C3 through the charging unit 223.

[0068] Specifically, during the charging process of the pre-charging resistor R6 to the energy storage capacitor C3, the detection unit 221 monitors the capacitor voltage on the energy storage capacitor C3 in real time. When the capacitor voltage exceeds a preset voltage, it outputs a drive signal to the drive unit 222, causing the drive unit 222 to start working according to the drive signal. After the drive unit 222 starts working, it controls the charging unit 223 to start working. At this time, the power supply voltage output by the switching module 21 charges the energy storage capacitor C3 through the charging unit 223, thereby reducing the current on the pre-charging resistor R6 and thus reducing voltage loss.

[0069] Furthermore, in another embodiment, such as Figure 3 As shown, the detection unit 221 includes a Zener diode DZ1 and a resistor R7; the driving unit 222 includes a switch Q4, a capacitor C2, a resistor R5 and a resistor R8; and the charging unit 223 includes a switch Q3.

[0070] The cathode of the Zener diode DZ1 is connected to the energy storage capacitor C3 through the resistor R7, and the anode of the Zener diode DZ1 is connected to the drive unit 222.

[0071] The control terminal of the switching transistor Q4 is connected to the anode of the Zener diode DZ1. The control terminal of the switching transistor Q4 is also grounded through the capacitor C2. The first terminal of the switching transistor Q4 is connected to the resistor R5 through the resistor R8. The resistor R5 is also connected to the switching module 21. The second terminal of the switching transistor Q4 is also used for grounding.

[0072] The control terminal of the switch Q3 is connected to the resistor R8, the first terminal of the switch Q3 is connected to the switch module 21, and the second terminal of the switch Q3 is connected to the energy storage capacitor C3.

[0073] Specifically, when the switching module 21 starts working, the energy storage capacitor C3 begins charging based on the pre-charging resistor R6. When the voltage stored in the energy storage capacitor C3 exceeds the voltage regulation value of the Zener diode ZD1, the Zener diode ZD1 breaks down, causing the switching transistor Q4 to receive the capacitor voltage and turn on according to the capacitor voltage. When the switching transistor Q4 turns on, the voltage at the second terminal of the resistor R8 is pulled low, and the voltage is divided between the resistor R5 and the resistor R8, thereby turning on the switching transistor Q3. When the switching transistor Q3 turns on, the power supply voltage output by the switching module 21 charges the energy storage capacitor C3 through the switching transistor Q3. It should be noted that since the switching transistor Q3 is connected in parallel with the resistor R6, when the switching transistor Q3 turns on, the resistor R6 is effectively short-circuited. Therefore, the power supply voltage output by the switching module 21 is input to the energy storage capacitor C3 through the switching transistor Q3, thereby reducing voltage loss.

[0074] It is known that the preset voltage is the voltage regulation value of the Zener diode ZD1. When determining the voltage regulation value of the Zener diode ZD1, it is necessary to determine the voltage regulation value to be relatively large in order to avoid the Zener diode ZD1 being broken down when the voltage drop between the power supply 10 and the electrical equipment 30 is large, which would result in a large current flowing through the switching transistor Q3.

[0075] This invention provides a capacitor soft-start circuit, comprising a switching module, a charging module, a pre-charging resistor, and an energy storage capacitor. The switching module is connected to a power supply and is also connected to the charging module and the pre-charging resistor. Both the pre-charging resistor and the charging module are connected to the energy storage capacitor. The switching module also receives an activation signal. Upon receiving the activation signal, the switching module starts operating to output the power supply voltage. The pre-charging resistor receives the power supply voltage and charges the energy storage capacitor accordingly, thereby limiting the instantaneous current during charging and protecting the circuit components from damage. During the charging process, the charging module continuously monitors the energy storage capacitor's voltage and starts operating when the voltage exceeds a preset value. This allows the charging module to replace the pre-charging resistor in charging the energy storage capacitor, reducing circuit losses and improving system stability and reliability.

[0076] 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 capacitive soft-start circuit, comprising: The capacitor soft starting circuit comprises a switch module, a charging module, a pre-charging resistor and an energy storage capacitor; The switch module is connected with a power supply, and is also connected with the charging module and the pre-charging resistor respectively; the pre-charging resistor and the charging module are also connected with the energy storage capacitor; and the switch module is also used for receiving an activation signal; The switch module is used for starting work according to the activation signal after receiving the activation signal, so as to output a power supply voltage of the power supply; The pre-charging resistor is used for receiving the power supply voltage of the power supply, and charging the energy storage capacitor according to the power supply voltage; The charging module is used for detecting a capacitor voltage of the energy storage capacitor in real time, and starting work when the capacitor voltage is greater than a preset voltage, so as to make the power supply charge the energy storage capacitor through the charging module.

2. The capacitive soft-start circuit of claim 1, wherein, The switch module comprises a control unit and a switch unit; The control unit is connected with the switch unit, and the switch unit is connected with the pre-charging resistor and the charging module respectively; the switch unit is also used for connecting the power supply; and the control unit is also used for receiving the activation signal; The control unit is used for starting work after receiving the activation signal, and outputting a control signal to the switch unit; The switch unit is used for starting work after receiving the control signal, so as to output the power supply voltage of the power supply.

3. The capacitor soft-start circuit of claim 2, wherein, The control unit comprises a switch tube Q1, a resistor R3, a resistor R4 and a capacitor C1; The control end of the switch tube Q1 receives an activation signal through the resistor R3, and is also grounded through the resistor R4; the capacitor C1 is connected with the resistor R4 in parallel; the first end of the switch tube Q1 is connected with the switch unit; and the second end of the switch tube Q1 is used for grounding.

4. The condenser soft-start circuit of claim 3, wherein, The switch unit comprises a switch tube Q2, a resistor R1 and a resistor R2; The control end of the switch tube Q2 is connected with the first end of the switch tube Q1 through the resistor R2; the first end of the switch tube Q2 is also connected with the resistor R2 through the resistor R1; the first end of the switch tube Q2 is also connected with the power supply; and the second end of the switch tube Q2 is connected with the pre-charging resistor and the charging module respectively.

5. The capacitive soft-start circuit of claim 1, wherein, The charging module comprises a detection unit, a driving unit and a charging unit; The detection unit is connected with the energy storage capacitor and the driving unit respectively; the driving unit is connected with the charging unit; and the charging unit is connected with the pre-charging resistor in parallel; The detection unit is used for detecting a capacitor voltage in the energy storage capacitor in real time, and outputting a driving signal to the driving unit when the capacitor voltage is greater than the preset voltage; The driving unit is used for starting work after receiving the driving signal, so as to control the charging unit to be turned on, thereby making the power supply charge the energy storage capacitor through the charging unit.

6. The capacitive soft-start circuit of claim 5, wherein, The detection unit comprises a voltage stabilizing tube DZ1 and a resistor R7; The cathode of the voltage stabilizing tube DZ1 is connected with the energy storage capacitor through the resistor R7; and the anode of the voltage stabilizing tube DZ1 is connected with the driving unit.

7. The capacitive soft-start circuit of claim 6, wherein, The driving unit comprises a switch tube Q4, a capacitor C2, a resistor R5 and a resistor R8; The control end of the switch tube Q4 is connected with the anode of the stabilizing tube DZ1, the control end of the switch tube Q4 is also grounded through the capacitor C2, the first end of the switch tube Q4 is connected with the resistor R5 through the resistor R8, the resistor R5 is also connected with the switch module, and the second end of the switch tube Q4 is also used for grounding.

8. The condenser soft-start circuit of claim 7, wherein, The charging unit comprises a switch tube Q3; The control end of the switch tube Q3 is connected with the resistor R8, the first end of the switch tube Q3 is connected with the switch module, and the second end of the switch tube Q3 is connected with the energy storage capacitor.

9. The condenser soft-start circuit of claim 2, wherein, The switch module further comprises a fuse F1; The fuse F1 is connected with the power supply and the switch unit respectively.

10. An energy storage power supply, characterized by, The energy storage power supply comprises: a power supply; and The capacitor soft starting circuit according to any one of claims 1-9.

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