Pre-charging circuit and energy storage device

Abstract

The utility model provides a pre-charging circuit and an energy storage device, and relates to the field of circuit application, and the circuit comprises a control module which is electrically connected with a first switch module and is used for sending a charging start signal or a charging stop signal to the first switch module; the first switch module is also electrically connected with the second switch module and is used for sending a switch-on signal or a switch-off signal to the second switch module when the charging starting signal or the charging stopping signal is received; the second switch module is further electrically connected with the energy storage capacitor and the charging power supply and is used for controlling the charging power supply to be connected with a charging path of the energy storage capacitor when receiving the connection signal, and the charging power supply outputs pre-charging current to the energy storage capacitor; and when the turn-off signal is received, the charging path between the charging power supply and the energy storage capacitor is disconnected. Therefore, the bidirectional turn-off control of the access between the energy storage capacitor and the charging power supply is realized, so that the reverse charging phenomenon after the pre-charging of the energy storage capacitor is finished is avoided, the safety of the circuit is improved, and the service life of the circuit is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of circuit applications, in particular to a pre-charging circuit and an energy storage device. Background Art

[0002] The input end of a power supply product is provided with an energy storage capacitor. When the power supply product is cold started, a large inrush current is generated. In order to prevent the inrush current, the energy storage capacitor is usually pre-charged before starting. However, the pre-charging circuit of the existing technology still has a reverse charging phenomenon, which can easily cause damage to the circuit. Utility Model Content

[0003] In view of this, the purpose of this utility model is to overcome the deficiencies in the prior art and provide a pre-charging circuit and energy storage device. This utility model provides the following technical solutions:

[0004] In a first aspect, an embodiment of the present invention provides a pre-charging circuit, comprising: a control module, a first switch module, and a second switch module; the control module is electrically connected to the first switch module, and is configured to send a start charging signal or a stop charging signal to the first switch module;

[0005] The first switch module is further electrically connected to the second switch module, and is configured to send an on signal or an off signal to the second switch module when receiving the start charging signal or the stop charging signal;

[0006] The second switch module is also electrically connected to the energy storage capacitor and the charging power supply, respectively, and is used to control the charging path between the charging power supply and the energy storage capacitor to be connected when receiving the conduction signal, so that the charging power supply outputs a pre-charge current to the energy storage capacitor; and when receiving the shutdown signal, disconnect the charging path between the charging power supply and the energy storage capacitor.

[0007] In one embodiment, the second switch module includes: an anti-reverse unit and a first switch unit; the input end of the first switch unit is electrically connected to the energy storage capacitor, the control end of the first switch unit is electrically connected to the first switch module, and the output end of the first switch unit is electrically connected to the anti-reverse unit; the anti-reverse unit is also electrically connected to the charging power supply; the anti-reverse unit is used to disconnect the charging path between the charging power supply and the energy storage capacitor.

[0008] In one embodiment, the anti-reverse unit includes: a current limiting diode; the anode of the current limiting diode is electrically connected to the output end of the first switching unit, and the cathode of the current limiting diode is electrically connected to the charging power supply; the current limiting diode is used to disconnect the charging path between the charging power supply and the energy storage capacitor.

[0009] In one embodiment, the anti-reverse unit includes: a first relay, a first end of the first relay is electrically connected to the output end of the first switch unit, a second end of the first relay is electrically connected to the charging power supply, a third end of the first relay is electrically connected to the third end of the first switch module, and a fourth end of the first relay is grounded; the first relay is configured to connect the charging path between the charging power supply and the energy storage capacitor when receiving the conduction signal from the first switch module; and disconnect the charging path between the charging power supply and the energy storage capacitor when receiving the shutdown signal from the first switch module.

[0010] In one embodiment, the first switching unit includes: a first switching tube and a parasitic diode; the input end of the first switching tube is electrically connected to the cathode of the parasitic diode, and the output end of the first switching tube is electrically connected to the anode of the parasitic diode; the input end of the first switching tube is also electrically connected to the energy storage capacitor, the output end of the first switching tube is also electrically connected to the anti-reverse unit, and the control end of the first switching tube is electrically connected to the first switching module.

[0011] In one embodiment, the second switch module further includes: a current limiting resistor connected in series between the energy storage capacitor and the input end of the first switch unit.

[0012] In one embodiment, the second switch module further includes: a voltage regulator diode; an anode of the voltage regulator diode is electrically connected to the output end of the first switch unit, and a cathode of the voltage regulator diode is electrically connected to the first switch module.

[0013] In one embodiment, the first switch module includes: a second switch unit, a third switch unit and a pull-up resistor; the control end of the second switch unit is electrically connected to the control module and the output end of the second switch unit, respectively, the input end of the second switch unit is electrically connected to the control end of the third switch unit and an external power supply, and the output end of the second switch unit is grounded; the input end of the third switch unit is electrically connected to the external power supply, and the output end of the third switch unit is connected to the second switch module and the pull-up resistor, respectively; the pull-up resistor is also electrically connected to the second switch module.

[0014] In one embodiment, the pre-charging circuit further includes: a trigger module electrically connected to the control module, for sending a pre-charging signal to the control module; the control module is further configured to send the start charging signal to the first switch module when receiving the pre-charging signal.

[0015] In a second aspect, the utility model provides an energy storage device, comprising: a charging power supply, an energy storage capacitor, a second relay, an energy storage unit, and the pre-charging circuit described in the first aspect; the energy storage capacitor is electrically connected to the pre-charging circuit, the second relay, and the charging power supply, respectively; the second relay is also electrically connected to the energy storage unit; and the charging power supply is also electrically connected to the pre-charging circuit and the energy storage unit, respectively.

[0016] An embodiment of the utility model provides a pre-charging circuit and an energy storage device, wherein a control module sends a charging start signal or a charging stop signal to a first switch module; when the first switch module receives the charging start signal or the charging stop signal, it sends a conduction signal or a shutdown signal to a second switch module; when the second switch module receives the conduction signal, it controls the charging path between the charging power supply and the energy storage capacitor to be connected, and the charging power supply outputs a pre-charging current to the energy storage capacitor; when the second switch module receives the shutdown signal, it disconnects the charging path between the charging power supply and the energy storage capacitor, thereby realizing bidirectional shutdown control of the energy storage capacitor and the charging power path, thereby avoiding reverse charging after the pre-charging is completed, and improving the safety and service life of the circuit.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of an application environment of a pre-charging circuit provided in an embodiment of the present application is shown;

[0020] Figure 2 A schematic structural diagram of a pre-charging circuit provided in an embodiment of the present application is shown;

[0021] Figure 3 A schematic diagram of another application environment of the pre-charging circuit provided in an embodiment of the present application is shown;

[0022] Figure 4 A partial schematic diagram of an application environment of a pre-charging circuit provided in an embodiment of the present application is shown;

[0023] Figure 5 A partial schematic diagram of another application environment of the pre-charging circuit provided in an embodiment of the present application is shown;

[0024] Figure 6 A partial schematic diagram of another application environment of the pre-charging circuit provided in an embodiment of the present application is shown;

[0025] Figure 7 A structural schematic diagram of the energy storage device provided in an embodiment of the present application is shown.

[0026] Description of main component symbols:

[0027] 100-pre-charging circuit; 110-control module; 120-first switch module; 130-second switch module; 131-anti-reverse unit; 200-charging power supply; 300-energy storage capacitor; Q1-first switch unit; Q2-second switch unit; Q3-third switch unit; K1-first relay; 400-second relay; 700-energy storage device; 710-energy storage unit. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the template description herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] The pre-charging circuit provided by the embodiment of the present invention can be applied to power supply products with energy storage capacitors at the input end. Figure 1, the charging power supply 200 is electrically connected to the energy storage capacitor 300 and the pre-charging circuit 100, respectively, wherein the charging power supply 200 includes a positive power supply electrode BAT+ and a negative power supply electrode BAT-, the positive power supply electrode BAT+ is connected to the energy storage capacitor 300, the negative power supply electrode BAT- is electrically connected to the pre-charging circuit 100, and the energy storage capacitor 300 is also electrically connected to the pre-charging circuit 100. The pre-charging circuit 100 can automatically perform shutdown control, realizing bidirectional shutdown control of the path between the energy storage capacitor and the charging power supply, thereby avoiding the reverse charging phenomenon that occurs after the pre-charging of the energy storage capacitor is completed, and improving the safety and service life of the circuit. The pre-charging circuit is described below with reference to some specific embodiments.

[0032] See Figure 2 The pre-charging circuit 100 includes a control module 110, a first switch module 120, and a second switch module 130. The first switch module 120 is electrically connected to the control module 110 and the second switch module 130, respectively. When the pre-charging circuit 100 is installed in a power supply product with an energy storage capacitor at its input, it can prevent reverse charging after the power supply product pre-charges the energy storage capacitor, thereby improving circuit safety.

[0033] See Figure 3 The power supply product may include a charging power supply 200 and an energy storage capacitor 300. The second switch module 130 of the pre-charging circuit 100 is electrically connected to the negative power supply electrode BAT- of the charging power supply 200 and the first end of the energy storage capacitor 300, respectively. The second end of the energy storage capacitor 300 is electrically connected to the positive power supply electrode BAT+ of the charging power supply 200. When the second switch module 130 is turned on, a conductive pre-charging circuit is formed between the charging power supply 200, the energy storage capacitor 300, and the second switch module 130, and the charging power supply 200 provides power to the energy storage capacitor 300.

[0034] It is understood that the control module 110 can control the on / off state of the charging path between the energy storage capacitor 300 and the charging power source 200 by controlling the first switch module 120 and the second switch module 130. The control module 110 may include a control chip that controls the on / off state of the charging path between the energy storage capacitor 300 and the charging power source 200, but this is not limited here.

[0035] In this embodiment, the control module 110 is configured to send a charge start signal to the first switch module 120. Upon receiving the charge start signal, the first switch module 120 is configured to send a conduction signal to the second switch module 130. Upon receiving the conduction signal, the second switch module 130 is configured to control the connection between the charging path of the charging power source 200 and the energy storage capacitor 300, so that the charging power source 200 outputs a pre-charge current to the energy storage capacitor 300. It will be understood that, at this point, a conductive pre-charge circuit is formed between the charging power source 200, the energy storage capacitor 300, and the second switch module 130, and the charging power source 200 provides electrical energy to the energy storage capacitor 300, so that reverse charging does not occur during the pre-charge process.

[0036] It is understandable that when the energy storage capacitor 300 is charged to a preset condition (for example, the energy storage capacitor 300 is fully charged, or the energy storage capacitor 300 reaches a preset voltage threshold), the control module 110 actively controls the charging power supply 200 to stop charging the energy storage capacitor 300.

[0037] Exemplarily, the control module 110 is further configured to send a stop charging signal to the first switch module 120 based on the electrical parameters and pre-charge current of the energy storage capacitor 300. For example, if the electrical parameter is capacity, the stop charging time is determined based on the capacity of the energy storage capacitor and the pre-charge current. When the stop charging time arrives, the stop charging signal is sent to the first switch module 120. The first switch module 120 is configured to send a shutdown signal to the second switch module 130 upon receiving the stop charging signal. The second switch module 130 is configured to disconnect the charging path between the charging power source 200 and the energy storage capacitor 300 upon receiving the shutdown signal. It will be understood that in this embodiment, when the second switch module 130 receives the shutdown signal, the second switch module 130 enters a disconnected state, thereby completely disconnecting the charging path between the charging power source 200 and the energy storage capacitor 300. The energy storage capacitor 300 will not output a reverse charge current to the pre-charge circuit 100, thereby preventing the pre-charge circuit 100 from being damaged by receiving the reverse charge current, thereby ensuring the safety of the pre-charge circuit 100.

[0038] See Figure 4 The second switch module 130 includes an anti-reverse charging unit 131 and a first switch unit Q1. The input end of the first switch unit Q1 is electrically connected to the energy storage capacitor 300, the control end of the first switch unit Q1 is electrically connected to the first switch module 120, and the output end of the first switch unit Q1 is electrically connected to the anti-reverse charging unit 131. The anti-reverse charging unit 131 is also electrically connected to the charging power supply 200. The anti-reverse charging unit 131 is used to disconnect the charging path between the charging power supply 200 and the energy storage capacitor 300.

[0039] Specifically, when the first switch module 120 receives the start charging signal S1 from the control module 110, the first switch module 120 outputs a conduction signal S3 and inputs the conduction signal S3 to the control terminal of the first switch unit Q1 and the anti-reverse unit 131. When the control terminal of the first switch unit Q1 receives the conduction signal S3, the first switch unit Q1 enters the conduction state, the charging path between the energy storage capacitor 300 and the charging power source 200 is connected, and the energy storage capacitor 300 begins pre-charging.

[0040] When the first switch module 120 receives the stop charging signal S2, the first switch module 120 outputs the shutdown signal S4. Specifically, when the control terminal of the first switch unit Q1 receives the shutdown signal S4, the first switch unit Q1 enters the off state. The first switch unit Q1 and the anti-reverse charging unit 131 work together to bidirectionally shut off the charging path between the energy storage capacitor 300 and the first switch unit Q1, so that there is no reverse charging current.

[0041] The anti-reverse unit 131 may include a relay, a diode, or a freewheeling MOS tube, and the specific selection is based on whether it can completely cut off the reverse charge current in the opposite direction of the pre-charge current. Figure 5 , Figure 5 and Figure 4 The difference is that the anti-reverse unit 131 includes a current limiting diode D1, and the other parts are the same. Among them, the anode of the current limiting diode D1 is electrically connected to the output end of the first switch unit Q1, and the cathode of the current limiting diode D1 is electrically connected to the charging power supply 200. When the control end of the first switch unit Q1 receives the conduction signal S3 from the first switch module 120, the first switch unit Q1 itself enters the conduction state, thereby conducting the charging path between the charging power supply 200 and the energy storage capacitor 300, and the charging power supply 200 provides electrical energy to the energy storage capacitor 300, and the energy storage capacitor 300 starts pre-charging. When the first switch unit Q1 receives the shutdown signal S4 from the first switch module 120, the first switch unit Q1 itself enters the shutdown state to shut off the charging path between the charging power supply 200 and the energy storage capacitor 300. It should be noted that the first switch unit Q1 includes a switch tube and a parasitic diode connected in parallel, wherein the switch tube can be a field effect tube (MOSFET). When the first switch unit Q1 is turned off, due to the presence of the parasitic diode, the first switch unit Q1 cannot be completely turned off, and a small current will flow through the parasitic diode. This small current is the reverse charging current. A current limiting diode D1 is set between the output end of the first switch unit Q1 and the charging power supply 200. By utilizing the unidirectional conduction characteristics of the current limiting diode D1, the charging path of the energy storage capacitor 300 and the pre-charging circuit 100 can be bidirectionally shut off, thereby preventing the generation of reverse charging current. It can be understood that Figure 4The current limiting diode D1 can be replaced by a freewheeling MOS transistor, which includes a parasitic diode. The anode of the parasitic diode is electrically connected to the output end of the first switch unit Q1, and the anode and cathode of the parasitic diode are electrically connected to the charging power supply 200. The working principle of the freewheeling MOS transistor is the same as that of the current limiting diode D1, which will not be described in detail here.

[0042] In another embodiment, see Figure 6 , Figure 6 and Figure 4 The difference is that the anti-reverse unit 131 includes a first relay K1, and the other parts are the same. The first end of the first relay K1 is electrically connected to the output end of the first switch unit Q1, the second end of the first relay K1 is electrically connected to the charging power supply 200, the third end of the first relay K1 is electrically connected to the third end of the first switch module 120, and the fourth end of the first relay K1 is grounded. The contacts of the first relay K1 are connected in series between the output end of the first switch unit Q1 and the charging power supply 200, and the coil of the first relay K1 is connected in series between the third end of the first switch module 120 and ground. When the first switch module 120 receives the start charging signal S1, the second end of the first switch module 120 outputs a conduction signal S3, wherein the conduction signal S3 includes a high-level signal.

[0043] Specifically, when the control terminal of the first switch unit Q1 receives a conduction signal, the first switch unit Q1 enters a conducting state. The conduction signal is also output from the third terminal of the first switch module 120 and connected to ground via the coil of the first relay K1. At this time, the coil of the first relay K1 is energized, generating a magnetic force that causes the contacts of the first relay K1 to close. When the contacts of the first relay K1 are closed and the first switch unit Q1 is turned on, the charging path between the energy storage capacitor 300 and the charging power source 200 is connected, and the energy storage capacitor 300 begins pre-charging. When the first switch module 120 receives a stop charging signal S2, the second terminal of the first switch module 120 outputs a shutdown signal S4. The shutdown signal S4 includes a low-level signal that is lower than the rated voltage of the coil of the first relay K1. Specifically, the first switch unit Q1 is turned off when the control terminal receives the shutdown signal S4. The conduction signal is also output from the first switch module 120 and connected to ground via the coil of the first relay K1. At this time, the coil of the first relay K1 loses power, the contact of the first relay K1 is disconnected, and the charging path between the energy storage capacitor 300 and the first switch unit Q1 is bidirectionally cut off, so there is no reverse charging current.

[0044] In one embodiment, see Figure 4-Figure 6The first switch unit Q1 includes: a first switch tube and a parasitic diode; the input end of the first switch tube is electrically connected to the cathode of the parasitic diode, and the output end of the first switch tube is electrically connected to the anode of the parasitic diode. The input end of the first switch tube is also electrically connected to the energy storage capacitor 300, the output end of the first switch tube is also electrically connected to the first end of the anti-reverse unit, and the control end of the first switch tube is electrically connected to the first switch module 120. It should be understood that when the control end of the first switch tube receives a turn-on signal from the first switch module 120, the first switch tube and the anti-reverse unit work together to turn on the charging path between the charging power supply 200 and the energy storage capacitor 300; when the control end of the first switch tube receives a turn-off signal S4 from the first switch module 120, the first switch tube and the anti-reverse unit work together to achieve bidirectional shutoff of the charging path between the charging power supply 200 and the energy storage capacitor 300, preventing reverse charging current.

[0045] Specifically, if the anti-reverse charging unit is a current limiting diode D1, when the control end of the first switch tube receives a conduction signal from the second end of the first switch module 120, the first switch tube is turned on. At this time, the charging path between the energy storage capacitor 300 and the charging power source 200 is connected, and the energy storage capacitor 300 begins to pre-charge; when the control end of the first switch tube receives a shutdown signal S4 from the second end of the first switch module 120, the first switch tube is turned off. At this time, due to the unidirectional conduction characteristic of the current limiting diode D1, the charging path between the energy storage capacitor 300 and the charging power source 200 is also turned off in the direction opposite to the pre-charging current, thereby preventing reverse charging current.

[0046] If the anti-reverse charge unit is the first relay K1, when the first switch module 120 sends a turn-on signal, the first switch tube is turned on and the coil of the first relay K1 is energized, causing the contacts of the first relay K1 to close. As a result, the charging path between the energy storage capacitor 300 and the charging power source 200 is connected, and the energy storage capacitor 300 begins to pre-charge. When the first switch module 120 sends a turn-off signal S4, the first switch tube is turned off and the first relay K1 is de-energized, causing the contacts of the first relay K1 to open. As a result, the charging path between the energy storage capacitor 300 and the charging power source 200 is bidirectionally disconnected, thereby preventing reverse charge current.

[0047] In one embodiment, see Figure 4-Figure 6 The second switch module 130 further includes a current-limiting resistor R7 connected in series between the energy storage capacitor 300 and the input terminal of the first switch unit Q1. By providing the current-limiting resistor R7, when the charging path between the energy storage capacitor 300 and the charging power source 200 is connected, the charging power source 200 can trickle charge the energy storage capacitor 300, thereby increasing the charge saturation of the energy storage capacitor 300.

[0048] It can be understood that in order to prevent the inrush current generated when the power supply product is started, the energy storage capacitor 300 is pre-charged. As the capacitance of the energy storage capacitor 300 increases, the voltage of the energy storage capacitor 300 gradually increases. When the power supply product is started, the voltage change rate will decrease, thereby reducing the risk of damage to the power supply product caused by the inrush current.

[0049] Please continue to see Figure 4-Figure 6 The second switch module 130 further includes a Zener diode D2; the anode of the Zener diode D2 is electrically connected to the output terminal of the first switch unit Q1, and the cathode of the Zener diode D2 is electrically connected to the first switch module 120. Due to the voltage-stabilizing characteristics of the Zener diode D2, when the voltage across the Zener diode D2 exceeds its breakdown voltage, the Zener diode D2 breaks down, and the anode voltage of the Zener diode D2 stabilizes at a value close to its breakdown voltage, thereby preventing the first switch unit Q1 from being damaged by excessive voltage at the input terminal.

[0050] In one embodiment, the first switch module 120 includes a second switch unit Q2, a third switch unit Q3, and a pull-up resistor R6. The control terminal of the second switch unit Q2 is electrically connected to the control module 110 and the output terminal of the second switch unit Q2, respectively. The input terminal of the second switch unit Q2 is electrically connected to the control terminal of the third switch unit Q3 and an external power supply VCC, respectively. The output terminal of the second switch unit Q2 is grounded. The external power supply VCC provides a supply voltage, for example, 12V. The input terminal of the third switch unit Q3 is electrically connected to the external power supply VCC, and the output terminal of the third switch unit Q3 is electrically connected to the second switch module 130 and the pull-up resistor R6, respectively. The pull-up resistor R6 is also electrically connected to the second switch module 130. When the control end of the second switch unit Q2 receives a turn-on signal from the control module 110, the second switch unit Q2 is turned on, and the external power supply is grounded through the second switch unit Q2. At this time, the input end of the third switch unit Q3 receives a high-level signal, the third switch unit Q3 is turned on, and the external power supply is grounded through the third switch unit Q3, the pull-up resistor R6 and the current-limiting diode D1, or the external power supply is grounded through the third switch unit Q3, the pull-up resistor R6 and the coil of the first relay K1. At this time, the input end of the first switch unit Q1 receives a high-level signal, and the first switch unit Q1 is turned on.

[0051] The second switch module 130 further includes a plurality of resistors. Figure 4-Figure 6, including a first resistor R1 connected in series between the control module and the input end of the second switch unit Q2; a second resistor R2 connected in series between the input end and the output end of the second switch unit Q2; a third resistor R3 connected in series between the input end of the second switch unit Q2 and the control end of the third switch unit Q3; a fourth resistor R4 connected in series between the input end and the control end of the third switch unit Q3; and a fifth resistor R5 connected in series between the output end of the third switch unit Q3 and the second switch module 130. It can be understood that the above-mentioned resistors are all used to protect the corresponding switch unit to prevent the corresponding switch unit from being overloaded and damaged.

[0052] In one embodiment, the pre-charging circuit 100 further includes a trigger module, which is electrically connected to the control module 110, and the trigger module is used to send a pre-charging signal to the control module 110. It is understood that the trigger module may include a button, and when the button receives an input operation from the user, a pre-charging signal is generated. When the pre-charging signal is received, the control module 110 sends a start charging signal to the first switch module 120 to control the first switch module 120 to send a conduction signal to the second switch module 130 to realize the charging path between the charging power supply 200 and the energy storage capacitor 300. In this way, pre-charging can be started by user operation.

[0053] The pre-charging circuit 100 provided in the embodiment of the present invention realizes bidirectional shutoff control of the energy storage capacitor and the charging power supply path, thereby avoiding reverse charging after the pre-charging is completed, and improving the safety and service life of the circuit.

[0054] Also, see Figure 7 The embodiment of the present invention also provides an energy storage device 700, which includes: a charging power supply 200, an energy storage capacitor 300, a second relay 400, an energy storage unit 710 and a pre-charging circuit 100. The energy storage capacitor 300 is electrically connected to the pre-charging circuit 100, the second relay 400 and the charging power supply 200 respectively; the second relay 400 is also electrically connected to the energy storage unit 710; the pre-charging circuit 100 and the energy storage unit 710 are also electrically connected to the charging power supply 200 respectively. Among them, the charging power supply 200 includes a positive power supply electrode BAT+ and a negative power supply electrode BAT-. Specifically, the energy storage capacitor 300 is electrically connected to the positive power supply electrode BAT+, and the negative power supply electrode BAT- of the charging power supply 200 is electrically connected to the pre-charging circuit 100.

[0055] In this embodiment, the pre-charging circuit 100 can control the charging circuit between the charging power supply 200, the energy storage capacitor 300, and the pre-charging circuit 100 to be conductive, so that the charging power supply 200, the energy storage capacitor 300, and the pre-charging circuit 100 form a loop to generate a pre-charging current, so that the charging power supply 200 pre-charges the energy storage capacitor 300. The pre-charging circuit 100 controls the charging power supply 200, the energy storage capacitor 300, and the pre-charging circuit 100 to disconnect the loop based on the electrical parameters of the energy storage capacitor 300 and the pre-charging current, so that the charging power supply 200 stops pre-charging the energy storage capacitor 300. Among them, the pre-charging circuit 100 determines the pre-charging stop charging time according to the electrical parameters of the energy storage capacitor 300 and the pre-charging current. When the stop charging time arrives, the circuit composed of the charging power supply 200, the energy storage capacitor 300, and the pre-charging circuit 100 is controlled to be in a disconnected state, thereby realizing flexible control of the pre-charging time and bidirectional blocking of the circuit composed of the charging power supply 200, the energy storage capacitor 300, and the pre-charging circuit 100.

[0056] At this time, the second relay 400 can receive an external control signal, so that the coil of the second relay 400 is energized, the contacts of the second relay 400 are attracted, and a conductive loop is formed by the charging power supply 200, the energy storage capacitor 300, the second relay 400 and the energy storage unit 710. The charging power supply 200 charges the energy storage unit 710, and no inrush current will appear in the conductive loop formed by the charging power supply 200, the energy storage capacitor 300, the second relay 400 and the energy storage unit 710, thereby avoiding circuit damage.

[0057] It can be understood that the optional items in the above embodiment are also applicable to this embodiment. To avoid redundancy, they will not be repeated here.

[0058] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not limiting, and thus other examples of the exemplary embodiments may have different values.

[0059] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0060] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A precharge circuit, characterized in that, The circuit includes: a control module, a first switch module and a second switch module; The control module is electrically connected to the first switch module and is used to send a charging start signal or a charging stop signal to the first switch module; The first switch module is further electrically connected to the second switch module, and is configured to send an on signal or an off signal to the second switch module when receiving the start charging signal or the stop charging signal; The second switch module is also electrically connected to the energy storage capacitor and the charging power supply, respectively, and is used to control the charging path between the charging power supply and the energy storage capacitor to be connected when receiving the conduction signal, so that the charging power supply outputs a pre-charge current to the energy storage capacitor; and when receiving the shutdown signal, disconnect the charging path between the charging power supply and the energy storage capacitor.

2. precharge circuit according to claim 1, is characterized in that, The second switch module includes: an anti-reverse unit and a first switch unit; The input end of the first switch unit is electrically connected to the energy storage capacitor, the control end of the first switch unit is electrically connected to the first switch module, and the output end of the first switch unit is electrically connected to the anti-reverse unit; The anti-reverse unit is also electrically connected to the charging power supply; The anti-reverse unit is used to disconnect the charging path between the charging power supply and the energy storage capacitor.

3. precharge circuit according to claim 2, is characterized in that, The anti-reverse unit includes: a current limiting diode; The anode of the current limiting diode is electrically connected to the output end of the first switch unit, and the cathode of the current limiting diode is electrically connected to the charging power supply; The current limiting diode is used to disconnect the charging path between the charging power supply and the energy storage capacitor.

4. precharge circuit according to claim 2, is characterized in that, The anti-reverse unit includes: a first relay, a first end of the first relay is electrically connected to the output end of the first switch unit, a second end of the first relay is electrically connected to the charging power supply, a third end of the first relay is electrically connected to the third end of the first switch module, and a fourth end of the first relay is grounded; The first relay is configured to connect the charging path between the charging power supply and the energy storage capacitor when receiving the on signal from the first switch module; and disconnect the charging path between the charging power supply and the energy storage capacitor when receiving the off signal from the first switch module.

5. precharge circuit according to claim 2, is characterized in that, The first switch unit includes: a first switch tube and a parasitic diode; The input end of the first switch tube is electrically connected to the cathode of the parasitic diode, and the output end of the first switch tube is electrically connected to the anode of the parasitic diode; The input end of the first switch tube is also electrically connected to the energy storage capacitor, the output end of the first switch tube is also electrically connected to the anti-reverse unit, and the control end of the first switch tube is electrically connected to the first switch module.

6. precharge circuit according to claim 2, is characterized in that, The second switch module further includes: A current limiting resistor is connected in series between the energy storage capacitor and the input end of the first switch unit.

7. precharge circuit according to claim 6, is characterized in that, The second switch module further includes: a voltage stabilizing diode; An anode of the voltage stabilizing diode is electrically connected to the output end of the first switch unit, and a cathode of the voltage stabilizing diode is electrically connected to the first switch module.

8. precharge circuit according to claim 1, is characterized in that, The first switch module includes: a second switch unit, a third switch unit and a pull-up resistor; The control end of the second switch unit is electrically connected to the control module and the output end of the second switch unit respectively, the input end of the second switch unit is electrically connected to the control end of the third switch unit and the external power supply respectively, and the output end of the second switch unit is grounded; An input end of the third switch unit is electrically connected to the external power supply, and an output end of the third switch unit is electrically connected to the second switch module and the pull-up resistor respectively; The pull-up resistor is also electrically connected to the second switch module.

9. according to the precharge circuit described in any one of claim 1-8, it is characterized in that, The pre-charge circuit also includes: a trigger module, electrically connected to the control module, and configured to send a pre-charge signal to the control module; The control module is further configured to send the start charging signal to the first switch module when receiving the pre-charging signal.

10. An energy storage device, characterized in that: The device comprises: a charging power supply, an energy storage capacitor, a second relay, an energy storage unit and the pre-charging circuit according to any one of claims 1 to 9; The energy storage capacitor is electrically connected to the pre-charging circuit, the second relay and the charging power supply respectively; The second relay is also electrically connected to the energy storage unit; The charging power supply is also electrically connected to the pre-charging circuit and the energy storage unit respectively.

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