A pre-charge driving circuit and an energy storage system

Abstract

This utility model relates to the technical field of energy storage systems, mainly providing a pre-charge drive circuit and an energy storage system, including a voltage detection module, a control module and a delay control module connected to the voltage detection module, a relay RLY1 connected to the delay control module, a relay RLY2 connected to the control module, a pre-charge resistor, and a pre-charge capacitor. Relay RLY2 is also connected to the pre-charge resistor. The voltage detection module outputs a drive signal when the collected power supply voltage is within a preset range, thus avoiding the need to use a controller to collect the voltage. The control module controls the pre-charge resistor to charge the pre-charge capacitor for a first preset time according to the drive signal and relay RLY2; while the pre-charge capacitor is charging, the delay control module controls relay RLY1 to charge the pre-charge capacitor after a second preset time when the bus voltage is greater than the preset voltage and the drive signal is received. Based on this, the working sequence of the pre-charge drive circuit can be ensured, thereby improving the reliability of the energy storage system.

Description

[Technical Field]

[0001] This utility model relates to the technical field of energy storage systems, and in particular to a pre-charge drive circuit and an energy storage system. [Background Technology]

[0002] In the field of energy storage systems, the PV / DC input port needs to have a certain high withstand voltage capability. To meet this requirement, relays are commonly used as input switches in the industry. However, relays generate inrush current when closed, which damages the relay contacts and greatly affects their service life and reliability. Therefore, a pre-charge circuit becomes an indispensable part of this solution to eliminate inrush current. Typically, when the MCU detects that the PV / DC input port voltage is within the normal range, it first closes the pre-charge relay. After a certain delay, if the MCU detects that the pre-charge voltage has reached the expected value, it then closes the main relay and opens the pre-charge relay, thus completing the entire input relay closing process.

[0003] However, this solution has significant limitations. From a hardware resource perspective, it typically requires MCU peripherals such as two ADC sampling channels and two relay control I / Os. More importantly, its operation sequence is extremely strict; if the operation sequence is incorrect, the pre-charging circuit will fail to function, thus reducing the reliability of the entire system. In practical applications, as the number of PV / DC input channels increases, these problems will be further amplified, with a large amount of MCU peripheral resources being occupied, leading to resource shortages and severely restricting the system's scalability and stability. [Utility Model Content]

[0004] This utility model provides a pre-charge drive circuit and energy storage system, aiming to solve the technical problems of low reliability and high MCU resource consumption in the prior art.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is: to provide a pre-charge drive circuit, the pre-charge drive circuit including a voltage detection module, a control module, a relay RLY1, a pre-charge resistor, a relay RLY2, a delay control module, and a pre-charge capacitor;

[0006] The voltage detection module is connected to the control module and the delay control module respectively. The voltage detection module is also connected to the power supply. The control module is connected to the coil terminal of the relay RLY2. The connection terminal of the relay RLY2 is connected to the power supply through the pre-charging resistor. The connection terminal of the relay RLY2 is also connected to the pre-charging capacitor. The delay control module is also connected to the coil terminal of the relay RLY1. The connection terminal of the relay RLY1 is also used to connect to the power supply and the pre-charging capacitor respectively.

[0007] The voltage detection module is used to collect and detect the power supply voltage of the power supply, and when the power supply voltage is within a preset range, it outputs a drive signal to the control module and the delay control module.

[0008] The control module is used to output a first control signal within a first preset time after receiving the drive signal, so as to make the relay RLY2 work, thereby making the power supply charge the pre-charge capacitor through the pre-charge resistor;

[0009] The delay control module is used to collect the bus voltage of the pre-charge capacitor, and after the bus voltage is greater than the preset voltage and the drive signal is received for a second preset time, it outputs a second control signal to the relay RLY1 to control the relay RLY1 to start working, so that the power supply charges the pre-charge capacitor through the relay RLY1, wherein the first preset time is greater than or equal to the second preset time.

[0010] Optionally, the voltage detection module includes a detection unit and a driving unit;

[0011] The detection unit is connected to the power supply and the drive unit respectively, and the drive unit is connected to the control module and the delay control module respectively;

[0012] The detection unit is used to collect the power supply voltage of the power supply, and when the power supply voltage is greater than a first preset value and less than a second preset value, it outputs a first signal to the drive unit, so that the drive unit outputs a drive signal to the control module and the delay control module according to the first signal, wherein the first preset value is less than the second preset value.

[0013] Optionally, the detection unit includes comparator U1, comparator U2, resistor R7, resistor R9, resistor R11 and resistor R12;

[0014] The first input terminal of comparator U1 is connected to the second input terminal of comparator U2. The first input terminal of comparator U1 is also connected to the power supply through resistor R7. Resistor R7 is also grounded through resistor R9. The second input terminal of comparator U1 is used to receive the first preset value. The output terminal of comparator U1 is connected to the driving unit. The output terminal of comparator U1 is also connected to the first power supply through resistor R11. The first input terminal of comparator U2 is used to receive the second preset value. The output terminal of comparator U2 is connected to the driving unit. The output terminal of comparator U2 is also connected to the first power supply through resistor R12.

[0015] Optionally, the driving unit is an AND gate U3;

[0016] The first input terminal of AND gate U3 is connected to the output terminal of comparator U1, the second input terminal of AND gate U3 is connected to the output terminal of comparator U2, and the output terminal of AND gate U3 is connected to the control module and the delay control module respectively.

[0017] Optionally, the control module includes a signal conversion unit and a first control unit;

[0018] The signal conversion unit is connected to the first control unit, and the first control unit is connected to the coil terminal of the relay RLY2. The signal conversion unit is also used to receive the drive signal.

[0019] The signal conversion unit is used to convert the driving signal into a single pulse signal after receiving the driving signal and then input it to the first control unit.

[0020] The first control unit is used to output a first control signal to the coil terminal of the relay RLY2 after receiving the single pulse signal, so as to control the relay RLY2 to stop working after working for a first preset time, thereby causing the power supply to charge the pre-charge capacitor through the pre-charge resistor.

[0021] Optionally, the signal conversion unit includes a capacitor C3, a resistor R8, and a resistor R10;

[0022] The capacitor C3 is connected to the resistor R8, which is grounded through the resistor R10. The resistor R8 is also connected to the first control unit, and the capacitor C3 is also used to receive the drive signal.

[0023] Optionally, the delay control module includes a data acquisition unit, a second control unit, and a delay unit;

[0024] The acquisition unit is connected to the pre-charge capacitor and the second control unit respectively; the delay unit is connected to the voltage detection module and the second control unit respectively; and the second control unit is connected to the coil terminal of the relay RLY1.

[0025] The acquisition unit is used to acquire the bus voltage of the precharged capacitor, and outputs a second signal to the second control unit when the bus voltage is greater than a preset voltage;

[0026] The delay unit is used to delay the drive signal for a second preset time after receiving the drive signal before inputting it to the second control unit;

[0027] The second control unit is used to output a second control signal to the relay RLY1 when it receives the second signal and the drive signal after a second preset time delay, so as to control the coil terminal of the relay RLY1 to be energized, thereby charging the pre-charge capacitor.

[0028] Optionally, the acquisition unit includes a comparator U5, resistors R1, R2, and R3;

[0029] The non-inverting input of comparator U5 is connected to the pre-charge capacitor through resistor R1. The non-inverting input of comparator U5 is also grounded through resistor R3. The inverting input of comparator U5 is used to receive a preset voltage. The output of comparator U5 is connected to the first power supply through resistor R2. The output of comparator U5 is also connected to the second control unit.

[0030] Optionally, the second control unit includes AND gate U4, resistor R4, resistor R6, and switch Q1;

[0031] The first input terminal of AND gate U4 is connected to the acquisition unit, the second input terminal of AND gate U4 is connected to the delay unit, the output terminal of AND gate U4 is connected to the control terminal of switch Q1 through resistor R4, the control terminal of switch Q1 is also grounded through resistor R6, the first terminal of switch Q1 is connected to the coil terminal of relay RLY1, and the second terminal of switch Q1 is also used for grounding.

[0032] 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:

[0033] Power supply; and

[0034] The precharge drive circuit described above.

[0035] Unlike related technologies, this utility model provides a pre-charge drive circuit and energy storage system. The circuit includes a voltage detection module, a control module, a relay RLY1, a pre-charge resistor, a relay RLY2, a delay control module, and a pre-charge capacitor. The voltage detection module is connected to both the control module and the delay control module, and is also connected to a power supply. The control module is connected to the coil terminal of relay RLY2. The connection terminal of relay RLY2 is connected to the power supply through the pre-charge resistor, and is also connected to the pre-charge capacitor. The delay control module is connected to the coil terminal of relay RLY1, and the connection terminal of relay RLY1 is used to connect to both the power supply and the pre-charge capacitor. The voltage detection module collects the power supply voltage and outputs a drive signal to the control module and the delay control module when the voltage is within a preset range, thus avoiding the need for a controller to collect the voltage and saving MCU peripheral resources. When the control module receives the drive signal, it controls the relay RLY2 to operate for a first preset time and then stop operating, thereby using the pre-charging resistor to charge the pre-charging capacitor and preventing large currents from damaging the components in the circuit. During the charging process of the pre-charging capacitor, the delay control module collects the bus voltage of the pre-charging capacitor in real time, and after the bus voltage exceeds the preset voltage and a second preset time has elapsed since receiving the drive signal, it controls the relay RLY1 to charge the pre-charging capacitor, thereby increasing the charging rate. Based on this, the control module and the delay control module can ensure the working sequence of the pre-charging drive circuit, thus improving the reliability of the energy storage system. [Attached Image Description]

[0036] 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.

[0037] Figure 1 This is a schematic diagram illustrating an application scenario provided by an embodiment of the present utility model;

[0038] Figure 2 This is a structural block diagram of a pre-charge drive circuit provided in an embodiment of the present invention;

[0039] Figure 3 This is a circuit diagram of a pre-charge drive circuit provided in an embodiment of this utility model.

Detailed Implementation Methods

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating an application scenario provided by an embodiment of the present invention, such as... Figure 1 As shown, this application scenario 1 includes an energy storage system 100 and an electrical device 200; the energy storage system 100 is connected to the electrical device 200. The energy storage system 100 is used to supply power to the electrical device 200 so that the electrical device 200 can operate normally.

[0046] Furthermore, in some embodiments, such as Figure 1As shown, the energy storage system 100 includes a power supply 10 and a pre-charge drive circuit 20. The power supply 10 is connected to the electrical device 200 through the pre-charge drive circuit 20. When the power supply 10 is connected to the pre-charge drive circuit 20, the pre-charge drive circuit 20 collects the power supply voltage of the power supply 10 to determine whether the power supply voltage is within a preset voltage range. If the power supply voltage is within the preset voltage range, the pre-charge drive circuit 20 starts working, thereby inputting the power supply voltage to the electrical device 200 to supply power to the electrical device 200. The electrical device 200 can be a storage device such as a battery, or an electrical device such as a load. The power supply 200 can be a photovoltaic input source, a battery, or other power supply equipment.

[0047] It should be noted that when the energy storage system 100 starts supplying power to the electrical device 200, a large voltage difference exists between the energy storage system 100 and the electrical device 200, resulting in a large current in the circuit at the moment of power supply, which can easily damage the device. Therefore, the energy storage system 100 incorporates a pre-charge drive circuit 20. This pre-charge drive circuit 20 ensures that the voltage received by the electrical device 200 rises slowly at the moment of power-on, thereby avoiding a large current in the device and improving the safety and reliability of the energy storage system 100.

[0048] In some embodiments, please refer to Figure 2 , Figure 2 This is a structural block diagram of a pre-charge drive circuit provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the precharge drive circuit 20 includes a voltage detection module 21, a control module 22, a relay RLY1, a precharge resistor RT1, a relay RLY2, a delay control module 23, and a precharge capacitor C1.

[0049] The voltage detection module 21 is connected to the control module 22 and the delay control module 23 respectively. The voltage detection module 21 is also connected to the power supply 10. The control module 22 is connected to the coil terminal of the relay RLY2. The connection terminal of the relay RLY2 is connected to the power supply 10 through the pre-charge resistor RT1. The connection terminal of the relay RLY2 is also connected to the pre-charge capacitor C1. The delay control module 23 is also connected to the coil terminal of the relay RLY1. The connection terminal of the relay RLY1 is also used to connect to the power supply 10 and the pre-charge capacitor C1 respectively.

[0050] The voltage detection module 21 is used to collect and detect the power supply voltage of the power supply 10, and when the power supply voltage is within a preset range, it outputs a drive signal to the control module 22 and the delay control module 23.

[0051] The control module 22 is used to output a first control signal within a first preset time after receiving the drive signal, so as to make the relay RLY2 work, thereby enabling the power supply 10 to charge the pre-charge capacitor C1 through the pre-charge resistor RT1.

[0052] The delay control module 23 is used to collect the bus voltage of the pre-charge capacitor C1, and after the bus voltage is greater than the preset voltage and the drive signal is received for a second preset time, it outputs a second control signal to the relay RLY1 to control the relay RLY1 to start working, so that the power supply 10 charges the pre-charge capacitor C1 through the relay RLY1, wherein the first preset time is greater than or equal to the second preset time.

[0053] Specifically, after the energy storage system 100 starts working, the voltage detection module 21 detects the power supply voltage of the power supply 10 to determine whether the power supply voltage is within a preset range. If the power supply voltage is within the preset range, it outputs a drive signal to the control module 22 and the delay control module 23. After receiving the drive signal, the control module 22 operates for a first preset time based on the drive signal and outputs a first control signal to the relay RLY2 during operation. When the relay RLY2 receives the first control signal, it starts working according to the first control signal, thereby causing the power supply 10 to charge the pre-charge capacitor C1 through the pre-charge resistor RT1. After the first preset time, the first control signal disappears, and the relay RLY2 stops working, thereby stopping the transmission of the power supply voltage.

[0054] During the charging process of the pre-charge capacitor C1 by the power supply 10 based on the pre-charge resistor RT1, the delay control module 23 collects the bus voltage of the pre-charge capacitor C1 in real time to determine whether the bus voltage is greater than a preset voltage. Simultaneously, the delay control module 23 also receives the drive signal and, at a second preset time after receiving the drive signal and when the bus voltage is greater than the preset voltage, outputs a second control signal to the relay RLY1, causing the relay RLY1 to start working according to the second control signal, thereby enabling the power supply 10 to charge the pre-charge capacitor C1 through the relay RLY1. Since the first preset time is greater than or equal to the second preset time, when the bus voltage is greater than the preset voltage, the delay control module 23 will start working before the control module 22 stops working, thus continuously charging the pre-charge capacitor C1. Based on this, the delay control module 23 and the control module 22 can ensure that the pre-charge drive circuit 20 operates strictly according to the operating sequence, thereby improving the reliability of the pre-charge drive circuit 20.

[0055] It should be noted that when the power supply 200 outputs voltage, its inrush current is large. If this power supply voltage is directly input to the pre-charge capacitor C1 at this time, it will damage the pre-charge capacitor C1. Therefore, when charging the pre-charge capacitor C1, the pre-charge resistor RT1 is controlled to pre-charge the pre-charge capacitor C1, so that the voltage of the pre-charge capacitor C1 rises slowly. When the voltage drop between the pre-charge capacitor C1 and the power supply 10 decreases, the pre-charge capacitor C1 is charged through the relay RLY1, thereby improving the voltage utilization rate. The pre-charge resistor RT1 can be a resistor with a large resistance value, a thermistor, or an adjustable resistor, etc. When the resistance value of the pre-charge resistor RT1 is large, when the relay RLY2 is closed, a portion of the power supply voltage can be consumed through the pre-charge resistor RT1, thus preventing a large voltage from being directly input to the pre-charge capacitor C1 and causing damage to it.

[0056] In some embodiments, such as Figure 2 As shown, the voltage detection module 21 includes a detection unit 211 and a driving unit 212;

[0057] The detection unit 211 is connected to the power supply 10 and the drive unit 212 respectively, and the drive unit 212 is connected to the control module 22 and the delay control module 23 respectively;

[0058] The detection unit 211 is used to collect the power supply voltage of the power supply 10, and when the power supply voltage is greater than a first preset value and less than a second preset value, it outputs a first signal to the drive unit 212, so that the drive unit 212 outputs a drive signal to the control module 22 and the delay control module 23 according to the first signal, wherein the first preset value is less than the second preset value.

[0059] Specifically, after the energy storage system 100 starts working, the detection unit 211 collects the power supply voltage of the power supply 10 to determine whether the power supply voltage is greater than a first preset value and less than a second preset value. When the power supply voltage is greater than the first preset value and less than the second preset value, the detection unit 211 outputs a first signal to the drive unit 212. After receiving the first signal, the drive unit 212 outputs a drive signal to the control module 22 and the delay control module 23 according to the first signal.

[0060] Furthermore, in yet another embodiment, please refer to Figure 3 , Figure 3 This is a circuit diagram of a pre-charge drive circuit provided in an embodiment of this utility model, as shown below. Figure 3As shown, the detection unit 211 includes comparator U1, comparator U2, resistor R7, resistor R9, resistor R11, and resistor R12; the driving unit 212 is an AND gate U3;

[0061] The first input terminal of comparator U1 is connected to the second input terminal of comparator U2. The first input terminal of comparator U1 is also connected to the power supply 10 through resistor R7. Resistor R7 is also grounded through resistor R9. The second input terminal of comparator U1 is used to receive the first preset value (V). oL The output of comparator U1 is connected to the driving unit 212, and the output of comparator U1 is also connected to the first power supply (VCC) through the resistor R11. The first input of comparator U2 is used to receive the second preset value (VCC). oH The output of the comparator U2 is connected to the driving unit 212, and the output of the comparator U2 is also connected to the first power supply (VCC) through the resistor R12.

[0062] The first input terminal of the AND gate U3 is connected to the output terminal of the comparator U1, the second input terminal of the AND gate U3 is connected to the output terminal of the comparator U2, and the output terminal of the AND gate U3 is connected to the control module 22 and the delay control module 23 respectively.

[0063] Specifically, when the power supply 10 outputs a power voltage, resistors R7 and R9 divide the power supply voltage and input the divided voltage to the first input terminal of comparator U1 and the second input terminal of comparator U2. Upon receiving the divided voltage, comparator U1 compares it with a first preset value. If the divided voltage is greater than the first preset value, comparator U1 outputs a high-level signal. Simultaneously, comparator U2 also compares the divided voltage with a second preset value and outputs a high-level signal when the divided voltage is less than the second preset value. If AND gate U3 simultaneously receives high-level signals from both comparator U1 and comparator U2, it is considered that AND gate U3 has received a first signal and outputs a drive signal (RLY PV) to the control module 22 and the delay control module 23 based on the first signal.

[0064] In some embodiments, the voltage detection module 21 can also be used to detect whether the power supply voltage of the power supply 20 is overvoltage. Specifically, such as... Figure 1 and Figure 3As shown, the energy storage system 100 further includes a controller 30, and the detection unit 211 further includes a diode D3. The anode of the diode D3 is connected to the output terminal of the comparator U2, and the cathode of the diode D3 is connected to the controller 30. When the voltage of the power supply after voltage division is greater than the second preset value, the comparator U2 will output an overvoltage signal to the controller 30 through the diode D3, so that the controller 30 can perform fast overvoltage protection based on the overvoltage signal, thereby improving the reliability and safety of the energy storage system 100.

[0065] It should be noted that resistors R11 and R12 are pull-up resistors. When comparators U1 and U2 output high-level signals, resistors R11 and R12 pull up the voltage of the high-level signal to the voltage corresponding to the first power supply, thereby improving the stability of the signal.

[0066] In some embodiments, such as Figure 2 As shown, the control module 22 includes a signal conversion unit 221 and a first control unit 222;

[0067] The signal conversion unit 221 is connected to the first control unit 222, and the first control unit 222 is connected to the coil terminal of the relay RLY2. The signal conversion unit 221 is also used to receive the drive signal.

[0068] The signal conversion unit 221 is used to convert the driving signal into a single pulse signal after receiving the driving signal and then input it to the first control unit 222.

[0069] The first control unit 222 is used to output a first control signal to the coil terminal of the relay RLY2 after receiving the single pulse signal, so as to control the relay RLY2 to stop working after working for a first preset time, thereby causing the power supply 10 to charge the pre-charge capacitor C1 through the pre-charge resistor RT1.

[0070] Specifically, when the voltage detection module 21 outputs the drive signal, the signal conversion unit 221 receives the drive signal and converts it into a single-pulse signal, which is then input to the first control unit 222. Upon receiving the single-pulse signal, the first control unit 222 starts operating according to the single-pulse signal and outputs a first control signal to the relay RLY2 during operation. This causes RLY2 to close according to the first control signal, allowing the power supply voltage of the power supply 10 to be input to the pre-charge capacitor C1 through the pre-charge resistor RT1 and the relay RLY2, thereby charging the pre-charge capacitor C1. After the single-pulse signal ends (after a first preset time), the first control unit 222 stops operating, thereby stopping the output of the first control signal, causing the relay RLY2 to open, and thus stopping the charging of the pre-charge capacitor C1.

[0071] In yet another embodiment, such as Figure 3 As shown, the signal conversion unit 221 includes a capacitor C3, a resistor R8, and a resistor R10; the first control unit 222 includes a switching transistor Q2;

[0072] The capacitor C3 is connected to the resistor R8, which is grounded through the resistor R10. The resistor R8 is also connected to the first control unit 222, and the capacitor C3 is also used to receive the drive signal.

[0073] The control terminal of the switching transistor Q2 is connected to the signal conversion unit 221, the first terminal of the switching transistor Q2 is connected to the coil terminal of the relay RLY2, and the second terminal of the switching transistor Q2 is used for grounding.

[0074] Specifically, when the voltage detection module 21 outputs the drive signal (RLY EN), due to the characteristics of the capacitor, capacitor C3 is effectively short-circuited. At this time, the drive signal is input to the control terminal of the switching transistor Q2 through the resistor R8, thereby turning on the switching transistor Q2. After the switching transistor Q2 is turned on, the coil terminal of the relay RLY2 is grounded through the switching transistor Q2. At this time, current flows through the coil terminal of the relay RLY2, thereby closing the relay RLY2. When the relay RLY2 is closed, the power supply voltage of the power supply 10 is input to the pre-charging capacitor C1 through the connection terminal of the pre-charging resistor RT1 and the relay RLY2, thereby charging the pre-charging capacitor C1. After a first preset time, capacitor C3 receives the drive signal and starts charging according to the drive signal. At this time, the drive signal is not input to the control terminal of the switching transistor Q2, the switching transistor Q2 is in the off state, and the relay RLY2 also stops working, thereby stopping the charging of the pre-charging capacitor C1. The width of the single pulse signal is determined by the capacitance value of capacitor C3 and the resistance value of resistor R8.

[0075] In another embodiment, such as Figure 2 As shown, the delay control module 23 includes a data acquisition unit 231, a second control unit 232, and a delay unit 233;

[0076] The acquisition unit 231 is connected to the pre-charge capacitor C1 and the second control unit 232 respectively; the delay unit 233 is connected to the voltage detection module 21 and the second control unit 232 respectively; and the second control unit 232 is connected to the coil terminal of the relay RLY1.

[0077] The acquisition unit 231 is used to acquire the bus voltage of the pre-charge capacitor C1, and outputs a second signal to the second control unit 232 when the bus voltage is greater than a preset voltage;

[0078] The delay unit 233 is used to delay the drive signal for a second preset time after receiving the drive signal and then input it to the second control unit 232;

[0079] The second control unit 232 is used to output a second control signal to the relay RLY1 when it receives the second signal and the drive signal after a second preset time delay, so as to control the coil terminal of the relay RLY1 to be energized, thereby charging the pre-charge capacitor C1.

[0080] Specifically, during the process of the power supply 10 charging the pre-charge capacitor C1 through the pre-charge resistor RT1 and the relay RLY2, the acquisition unit 231 will collect the bus voltage of the pre-charge capacitor C1 in real time to determine whether the bus voltage is greater than the preset voltage. When the bus voltage is greater than the preset voltage, the second signal will be output to the second control unit 232. When the delay unit 233 receives the drive signal output by the voltage detection module 21, the delay unit 233 will delay the drive signal for a second preset time before inputting it to the second control unit 232. When the second control unit 232 receives the second signal and also receives the drive signal delayed for the second preset time, the second control unit 232 will output a second control signal to the coil terminal of the relay RLY1 to energize the coil terminal of the relay RLY1. When the coil terminal of the relay RLY1 is energized, the relay RLY1 starts to work, thereby outputting the power supply voltage of the power supply 10 to the pre-charge capacitor C1 through the relay RLY1 to charge the pre-charge capacitor C1.

[0081] In yet another embodiment, such as Figure 3 As shown, the acquisition unit 231 includes a comparator U5, resistors R1, R2, and R3; the second control unit 232 includes an AND gate U4, resistors R4 and R6, and a switching transistor Q1; the delay unit 233 includes a capacitor C2 and a resistor R5.

[0082] The non-inverting input of the comparator U5 is connected to the pre-charge capacitor C1 through the resistor R1. The non-inverting input of the comparator U5 is also grounded through the resistor R3. The inverting input of the comparator U5 is used to receive the preset voltage. The output of the comparator U5 is connected to the first power supply (VCC) through the resistor R2. The output of the comparator U5 is also connected to the second control unit 232.

[0083] The first input terminal of AND gate U4 is connected to the acquisition unit 231, the second input terminal of AND gate U4 is connected to the delay unit 233, the output terminal of AND gate U4 is connected to the control terminal of switch Q1 through resistor R4, the control terminal of switch Q1 is also grounded through resistor R6, the first terminal of switch Q1 is connected to the coil terminal of relay RLY1, and the second terminal of switch Q1 is also used for grounding.

[0084] The resistor R5 is connected to the second input terminal of the AND gate U4 and the voltage detection module 21, respectively. The resistor R5 is also grounded through the capacitor C2.

[0085] Specifically, when the voltage detection module 21 outputs the drive signal, the drive signal will charge the capacitor C2 through the resistor R5, and after the capacitor C2 finishes charging (second preset time), the drive signal will be input to the second input terminal of the AND gate U4 through the resistor R5.

[0086] Simultaneously, when the pre-charge resistor RT1 pre-charges the pre-charge capacitor C1, resistors R1 and R3 divide the bus voltage of the pre-charge capacitor C1 and input the divided bus voltage to the non-inverting input of comparator U5. Upon receiving the divided bus voltage, comparator U5 compares it with a preset voltage (Vref). If the divided bus voltage is greater than the preset voltage, it outputs a second signal to the first input of AND gate U4. If AND gate U4 simultaneously receives the second signal and a drive signal delayed by a second preset time, it controls the switch Q1 to turn on. When switch Q1 is turned on, it outputs a second control signal to the coil of relay RLY1, energizing the coil and allowing the power supply 10 to charge the pre-charge capacitor C1 through relay RLY1.

[0087] In yet another embodiment, such as Figure 3 As shown, the pre-charge drive circuit 20 further includes diodes D1 and D2. Diode D1 is connected to the coil terminal of relay RLY1, and diode D2 is connected to the coil terminal of relay RLY2. Diode D1 is used to release the residual voltage in the coil terminal of relay RLY1 when relay RLY1 is disconnected. Diode D2 is used to release the residual voltage in the coil terminal of relay RLY2.

[0088] This utility model embodiment provides a pre-charge drive circuit, which includes a voltage detection module, a control module, a relay RLY1, a pre-charge resistor, a relay RLY2, a delay control module, and a pre-charge capacitor. The voltage detection module is connected to both the control module and the delay control module, and is also connected to a power supply. The control module is connected to the coil terminal of the relay RLY2. The connection terminal of the relay RLY2 is connected to the power supply through the pre-charge resistor, and is also connected to the pre-charge capacitor. The delay control module is also connected to the coil terminal of the relay RLY1, and the connection terminal of the relay RLY1 is used to connect to both the power supply and the pre-charge capacitor. The voltage detection module collects the power supply voltage and outputs a drive signal to the control module and the delay control module when the power supply voltage is within a preset range, thereby avoiding the need for a controller to collect the voltage and saving MCU peripheral resources. When the control module receives the drive signal, it controls the relay RLY2 to operate for a first preset time and then stop operating, thereby using the pre-charging resistor to charge the pre-charging capacitor and preventing large currents from damaging the components in the circuit. During the charging process of the pre-charging capacitor, the delay control module collects the bus voltage of the pre-charging capacitor in real time, and after the bus voltage exceeds the preset voltage and a second preset time has elapsed since receiving the drive signal, it controls the relay RLY1 to charge the pre-charging capacitor, thereby increasing the charging rate. Based on this, the control module and the delay control module can ensure the working sequence of the pre-charging drive circuit, thus improving the reliability of the energy storage system.

[0089] 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 pre-charge drive circuit, characterized in that, The precharge drive circuit includes a voltage detection module, a control module, a relay RLY1, a precharge resistor, a relay RLY2, a delay control module, and a precharge capacitor. The voltage detection module is connected to the control module and the delay control module respectively. The voltage detection module is also connected to the power supply. The control module is connected to the coil terminal of the relay RLY2. The connection terminal of the relay RLY2 is connected to the power supply through the pre-charging resistor. The connection terminal of the relay RLY2 is also connected to the pre-charging capacitor. The delay control module is also connected to the coil terminal of the relay RLY1. The connection terminal of the relay RLY1 is also used to connect to the power supply and the pre-charging capacitor respectively. The voltage detection module is used to collect and detect the power supply voltage of the power supply, and when the power supply voltage is within a preset range, it outputs a drive signal to the control module and the delay control module. The control module is used to output a first control signal within a first preset time after receiving the drive signal, so as to make the relay RLY2 work, thereby making the power supply charge the pre-charge capacitor through the pre-charge resistor; The delay control module is used to collect the bus voltage of the pre-charge capacitor, and after the bus voltage is greater than the preset voltage and the drive signal is received for a second preset time, it outputs a second control signal to the relay RLY1 to control the relay RLY1 to start working, so that the power supply charges the pre-charge capacitor through the relay RLY1, wherein the first preset time is greater than or equal to the second preset time.

2. The pre-charge drive circuit according to claim 1, characterized in that, The voltage detection module includes a detection unit and a driving unit; The detection unit is connected to the power supply and the drive unit respectively, and the drive unit is connected to the control module and the delay control module respectively; The detection unit is used to collect the power supply voltage of the power supply, and when the power supply voltage is greater than a first preset value and less than a second preset value, it outputs a first signal to the drive unit, so that the drive unit outputs a drive signal to the control module and the delay control module according to the first signal, wherein the first preset value is less than the second preset value.

3. The pre-charge drive circuit according to claim 2, characterized in that, The detection unit includes comparator U1, comparator U2, resistor R7, resistor R9, resistor R11 and resistor R12; The first input terminal of comparator U1 is connected to the second input terminal of comparator U2. The first input terminal of comparator U1 is also connected to the power supply through resistor R7. Resistor R7 is also grounded through resistor R9. The second input terminal of comparator U1 is used to receive the first preset value. The output terminal of comparator U1 is connected to the driving unit. The output terminal of comparator U1 is also connected to the first power supply through resistor R11. The first input terminal of comparator U2 is used to receive the second preset value. The output terminal of comparator U2 is connected to the driving unit. The output terminal of comparator U2 is also connected to the first power supply through resistor R12.

4. The pre-charge drive circuit according to claim 3, characterized in that, The driving unit is an AND gate U3; The first input terminal of AND gate U3 is connected to the output terminal of comparator U1, the second input terminal of AND gate U3 is connected to the output terminal of comparator U2, and the output terminal of AND gate U3 is connected to the control module and the delay control module respectively.

5. The pre-charge drive circuit according to claim 1, characterized in that, The control module includes a signal conversion unit and a first control unit; The signal conversion unit is connected to the first control unit, and the first control unit is connected to the coil terminal of the relay RLY2. The signal conversion unit is also used to receive the drive signal. The signal conversion unit is used to convert the driving signal into a single pulse signal after receiving the driving signal and then input it to the first control unit. The first control unit is used to output a first control signal to the coil terminal of the relay RLY2 after receiving the single pulse signal, so as to control the relay RLY2 to stop working after working for a first preset time, thereby causing the power supply to charge the pre-charge capacitor through the pre-charge resistor.

6. The pre-charge drive circuit according to claim 5, characterized in that, The signal conversion unit includes capacitor C3, resistor R8 and resistor R10; The capacitor C3 is connected to the resistor R8, which is grounded through the resistor R10. The resistor R8 is also connected to the first control unit, and the capacitor C3 is also used to receive the drive signal.

7. The pre-charge drive circuit according to claim 1, characterized in that, The delay control module includes a data acquisition unit, a second control unit, and a delay unit; The acquisition unit is connected to the pre-charge capacitor and the second control unit respectively; the delay unit is connected to the voltage detection module and the second control unit respectively; and the second control unit is connected to the coil terminal of the relay RLY1. The acquisition unit is used to acquire the bus voltage of the precharged capacitor, and outputs a second signal to the second control unit when the bus voltage is greater than a preset voltage; The delay unit is used to delay the drive signal for a second preset time after receiving the drive signal before inputting it to the second control unit; The second control unit is used to output a second control signal to the relay RLY1 when it receives the second signal and the drive signal after a second preset time delay, so as to control the coil terminal of the relay RLY1 to be energized, thereby charging the pre-charge capacitor.

8. The pre-charge drive circuit according to claim 7, characterized in that, The acquisition unit includes a comparator U5, resistors R1, R2, and R3; The non-inverting input of comparator U5 is connected to the pre-charge capacitor through resistor R1. The non-inverting input of comparator U5 is also grounded through resistor R3. The inverting input of comparator U5 is used to receive a preset voltage. The output of comparator U5 is connected to the first power supply through resistor R2. The output of comparator U5 is also connected to the second control unit.

9. The pre-charge drive circuit according to claim 7, characterized in that, The second control unit includes AND gate U4, resistor R4, resistor R6, and switch Q1; The first input terminal of AND gate U4 is connected to the acquisition unit, the second input terminal of AND gate U4 is connected to the delay unit, the output terminal of AND gate U4 is connected to the control terminal of switch Q1 through resistor R4, the control terminal of switch Q1 is also grounded through resistor R6, the first terminal of switch Q1 is connected to the coil terminal of relay RLY1, and the second terminal of switch Q1 is also used for grounding.

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

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