Capacitive load voltage release circuit for power supply system and power supply system
By introducing a capacitive load relief circuit into the power system, and utilizing the relief switch and relief load to consume the capacitive load charge, the problem of false voltage judgment after the capacitive load is powered off is solved, and accurate control of the battery management system is achieved.
Patent Information
- Application Number
- CN202423216667.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2034-12-25
AI Technical Summary
In existing battery management systems, after the power system is powered off, the capacitive load generates false voltage due to the capacitor, leading to misjudgments and affecting the accuracy of subsequent actions.
Design a capacitive load relief circuit, including a first switch, a relief switch and a relief load. By opening the first switch and closing the relief switch, the capacitive load and the relief load are connected, consuming the charge stored in the capacitive load and avoiding false voltage judgment.
It effectively eliminates the false voltage of capacitive loads, ensures accurate control of the battery management system, avoids misjudgments, and guarantees the normal operation of the power system.
Smart Images
Figure CN223898985U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of battery technology, and more specifically, to a capacitive load relief circuit and a power supply system for a power supply system. Background Technology
[0002] In existing technologies, a Battery Management System (BMS) is used to effectively manage the power system. Specifically, the BMS monitors the operating status of the power system through high-voltage detection points. However, if the load of the power system is capacitive, a virtual voltage will be generated at one end of the capacitive load after the power is turned off due to the capacitance. This voltage can be detected by the BMS through the high-voltage detection points, causing the BMS to misjudge the operating status of the power system, resulting in the inability to proceed to the next step or the incorrect execution of the next step.
[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention
[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a capacitive load relief circuit and power supply system for a power supply system.
[0005] According to one aspect of this disclosure, a capacitive load relief circuit for a power supply system is provided, electrically connected between the power supply and a capacitive load, the capacitive load relief circuit comprising:
[0006] A first switch has a first power connection terminal and a first load connection terminal. The first power connection terminal is electrically connected to the positive terminal of the power supply, the first load connection terminal is electrically connected to one end of the capacitive load, and the other end of the capacitive load is electrically connected to the negative terminal of the power supply.
[0007] A pressure relief switch and a pressure relief load are provided, wherein the pressure relief switch and the pressure relief load are connected in series and electrically connected between the first load connection terminal and the negative terminal of the power supply.
[0008] In one exemplary embodiment of this disclosure, the capacitive load relief circuit further includes:
[0009] The second switch has a second power connection terminal and a second load connection terminal. The second power connection terminal is electrically connected to the negative terminal of the power supply, and the second load connection terminal is electrically connected to the capacitive load. The pressure relief switch and the pressure relief load are connected in series at the second load connection terminal.
[0010] In one exemplary embodiment of this disclosure, the pressure relief load is electrically connected between the pressure relief switch and the second load connection terminal.
[0011] In one exemplary embodiment of this disclosure, the capacitive load relief circuit further includes:
[0012] The battery management system is electrically connected to the control terminal of the first switch, the control terminal of the second switch, and the control terminal of the pressure relief switch, and is also electrically connected to the first power connection terminal, the first load connection terminal, the second power connection terminal, and the second load connection terminal.
[0013] In one exemplary embodiment of this disclosure, the capacitive load relief circuit further includes:
[0014] A pre-charge circuit is electrically connected to the first switch, and the pre-charge circuit is used to pre-charge the first load connection terminal.
[0015] In one exemplary embodiment of this disclosure, the precharge circuit includes:
[0016] A precharge switch and a precharge load are provided, wherein the precharge switch and the precharge load are connected in series, and the precharge switch and the precharge load are connected in parallel with the first switch.
[0017] In one exemplary embodiment of this disclosure, the precharge circuit includes:
[0018] A pre-charge switch is electrically connected between the first power connection terminal and the positive terminal of the power source;
[0019] The pre-charged load is connected in parallel with the first switch.
[0020] In one exemplary embodiment of this disclosure, the capacitive load relief circuit further includes:
[0021] A fuse is electrically connected between the power source and the first switch.
[0022] In one exemplary embodiment of this disclosure, the capacitive load includes an electric motor.
[0023] According to another aspect of this disclosure, a power supply system is provided, comprising:
[0024] power supply;
[0025] Capacitive load;
[0026] The capacitive load relief circuit is any one of the capacitive load relief circuits for a power supply system described above, wherein the capacitive load relief circuit is electrically connected between the power supply and the capacitive load.
[0027] The capacitive load relief circuit disclosed herein for a power supply system has the following steps: First switch is opened, the capacitive load is disconnected from the power supply and power is off. Then, the relief switch is closed, connecting the capacitive load and the relief load. The relief load can consume the charge stored in the capacitive load. Once the charge is completely consumed, the relief switch is opened, thereby preventing the battery management system from detecting false voltage generated by the capacitive load, which could lead to misjudgment of the power supply system's operating status by the battery management system. This ensures that the battery management system accurately controls the next step of the operation.
[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description
[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.
[0030] Figure 1 This is a schematic diagram of an example embodiment of the power supply system disclosed herein.
[0031] Figure 2 This is a schematic diagram of another example embodiment of the power supply system disclosed herein.
[0032] Figure 3 for Figure 1 and Figure 2 A schematic diagram of the connection structure between the switch and the battery management system.
[0033] Explanation of reference numerals in the attached figures:
[0034] 10. Capacitive load relief circuit; 101. Pre-charge circuit;
[0035] KM1, first switch; KM11, first power supply connection terminal; KM12, first load connection terminal;
[0036] KM2, second switch; KM21, second power supply connection terminal; KM22, second load connection terminal;
[0037] KM3, pressure relief switch; R1, pressure relief load;
[0038] BMS, Battery Management System; DI1, First Input Interface; DI2, Second Input Interface; DI3, Third Input Interface; DI4, Fourth Input Interface; DO1, First Output Interface; DO2, Second Output Interface; DO3, Third Output Interface; DO4, Fourth Output Interface; DO5, Fifth Output Interface; DO6, Sixth Output Interface; DO7, Seventh Output Interface; DO8, Eighth Output Interface; DC+, Positive Power Interface; DC-, Negative Power Interface;
[0039] KM4, pre-charge switch; R2, pre-charge load;
[0040] FU1, Fuse; DY, Power Supply; FZ, Capacitive Load;
[0041] KM5, charging switch; CD, charging interface. Detailed Implementation
[0042] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.
[0043] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.
[0044] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.
[0045] In this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0046] This disclosure provides an exemplary embodiment of a capacitive load relief circuit 10 for a power supply system, with reference to... Figures 1-3 As shown, the capacitive load relief circuit 10 is electrically connected between the power supply DY and the capacitive load FZ. The capacitive load relief circuit 10 may include a first switch KM1, a relief switch KM3, and a relief load R1. The first switch KM1 has a first power connection terminal KM11 and a first load connection terminal KM12. The first power connection terminal KM11 is electrically connected to the positive terminal of the power supply DY, and the first load connection terminal KM12 is electrically connected to one end of the capacitive load FZ. The other end of the capacitive load FZ is electrically connected to the negative terminal of the power supply DY. The relief switch KM3 is connected in series with the relief load R1 and is electrically connected between the first load connection terminal KM12 and the negative terminal of the power supply DY.
[0047] The capacitive load relief circuit 10 disclosed herein for a power supply system has the following steps: First switch KM1 is open, capacitive load FZ is disconnected from power supply DY and powered down. Then, relief switch KM3 is closed, connecting capacitive load FZ to relief load R1. Relief load R1 can consume the charge stored in capacitive load FZ. After the relief is completed, relief switch KM3 is opened, thereby preventing the battery management system (BMS) from detecting false voltage generated by capacitive load FZ, which could lead to misjudgment of the power supply system's operating status by the BMS. This ensures that the BMS accurately controls the next step of the operation.
[0048] In this example embodiment, the power supply DY may include one, two, or more lithium batteries. Two lithium batteries may be connected in series or in parallel; multiple lithium batteries may be connected in series or in parallel, or a combination of series and parallel connections. Lithium batteries are widely used due to their advantages such as high energy density, long cycle life, environmental friendliness, no memory effect, high open-circuit voltage, wide operating temperature range, fast charging and discharging speed, and light weight.
[0049] Of course, in some other exemplary embodiments of this disclosure, the power source DY can also be a nickel-cadmium battery, a nickel-metal hydride battery, a lead-acid battery, etc.
[0050] In this example implementation, refer to Figure 1 and Figure 2 As shown, the first switch KM1 has a first power connection terminal KM11 and a first load connection terminal KM12. The first power connection terminal KM11 is electrically connected to the positive terminal of the power supply DY. The first switch KM1 realizes the conduction and disconnection of the first power connection terminal KM11 and the first load connection terminal KM12. For example, when the first switch KM1 is closed, the first power connection terminal KM11 and the first load connection terminal KM12 are connected; when the first switch KM1 is open, the first power connection terminal KM11 and the first load connection terminal KM12 are disconnected.
[0051] A capacitive load FZ is electrically connected to a power supply DY. Specifically, one end of the capacitive load FZ is electrically connected to the first load connection terminal KM12, and the other end of the capacitive load FZ is electrically connected to the negative terminal of the power supply DY. The connection and disconnection between the capacitive load FZ and the power supply DY can be realized through the first switch KM1. For example, when the first switch KM1 is closed, the capacitive load FZ is connected to the power supply DY, and the power supply DY can provide electrical energy to the capacitive load FZ, so that the capacitive load FZ can work. When the first switch KM1 is open, the capacitive load FZ is disconnected from the power supply DY, and the power supply DY cannot provide electrical energy to the capacitive load FZ, so that the capacitive load FZ stops working.
[0052] A capacitive load FZ can include one, two, or more loads. Two loads can be connected in series or in parallel; multiple loads can be connected in series or in parallel, or a combination of series and parallel connections.
[0053] A capacitive load FZ generally refers to a load with capacitance parameters, that is, a load that exhibits the characteristic of current leading voltage. During charging and discharging, the voltage of a capacitive load FZ cannot change abruptly, and its corresponding power factor is negative, while the power factor of an inductive load is positive. In this example embodiment, the capacitive load FZ may include one, two, or three of the following: a motor, an air compressor, a DC-to-DC converter, etc. Of course, the capacitive load FZ may also include other electrical equipment, which will not be described in detail here.
[0054] In this example implementation, refer to Figure 1 and Figure 2 As shown, the pressure relief switch KM3 and the pressure relief load R1 are connected in series. The pressure relief switch KM3 and the pressure relief load R1 are electrically connected between the first load connection terminal KM12 and the negative terminal of the power supply DY. That is, after the pressure relief switch KM3 and the pressure relief load R1 are connected in series, they are electrically connected between the first load connection terminal KM12 and the negative terminal of the power supply DY.
[0055] The charge stored in the capacitive load FZ can be consumed by the pressure relief switch KM3 and the pressure relief load R1. Specifically, the first switch KM1 is opened, the capacitive load FZ is disconnected from the power supply DY and powered down. Then, the pressure relief switch KM3 is closed, making the capacitive load FZ and the pressure relief load R1 conductively connected. The pressure relief load R1 can consume the charge stored in the capacitive load FZ. After a few seconds, for example, about 3 seconds, the pressure relief load R1 can consume all the charge stored in the capacitive load FZ. After the pressure relief is completed, the pressure relief switch KM3 is finally opened. This avoids the battery management system (BMS) from detecting the false voltage generated by the capacitive load FZ, which would cause the BMS to misjudge the working status of the power system. This ensures that the BMS control the next action accurately.
[0056] In other example embodiments of this disclosure, reference is made to Figure 1 and Figure 2 As shown, the capacitive load relief circuit 10 may further include a second switch KM2. The second switch KM2 has a second power supply connection terminal KM21 and a second load connection terminal KM22. The second power supply connection terminal KM21 is electrically connected to the negative terminal of the power supply DY, and the second load connection terminal KM22 is electrically connected to the capacitive load FZ. The second switch KM2 enables the second power supply connection terminal KM21 and the second load connection terminal KM22 to be turned on and off. For example, when the second switch KM2 is closed, the second power supply connection terminal KM21 and the second load connection terminal KM22 are turned on; when the second switch KM2 is open, the second power supply connection terminal KM21 and the second load connection terminal KM22 are disconnected.
[0057] The connection and disconnection between the capacitive load FZ and the power supply DY are achieved through the joint action of the first switch KM1 and the second switch KM2. For example, when both switches KM1 and KM2 are closed, the capacitive load FZ is connected to the power supply DY, allowing the power supply DY to provide power to the capacitive load FZ, enabling it to operate. Conversely, if either switch KM1 or KM2 is open, the capacitive load FZ is disconnected from the power supply DY, preventing the power supply DY from providing power and causing the capacitive load FZ to stop operating. This ensures the deterministic connection and disconnection between the capacitive load FZ and the power supply DY, further guaranteeing the safety of the power system.
[0058] In this case, the pressure relief switch KM3 and the pressure relief load R1 are connected in series at the second load connection terminal KM22. Specifically, the pressure relief switch KM3 and the pressure relief load R1 are connected in series between the first load connection terminal KM12 and the second load connection terminal KM22, with the pressure relief switch KM3 closer to the first load connection terminal KM12 and the pressure relief load R1 closer to the second load connection terminal KM22. This arrangement can ensure the safety of the pressure relief circuit.
[0059] The specific power-on process is as follows: First, close the second switch KM2, then close the first switch KM1 to complete the power-on process. That is, connect the negative terminal of the power supply DY first, then connect the positive terminal of the power supply DY. Ground the capacitive load FZ of the circuit first to avoid unexpected situations. The specific power-off and voltage relief process is as follows: First, open the first switch KM1, then open the second switch KM2 to complete the power-off process. That is, disconnect the positive terminal of the power supply DY first, then disconnect the negative terminal of the power supply DY, so that the circuit remains grounded before disconnection to avoid unexpected situations. Then, close the voltage relief switch KM3 to connect the capacitive load FZ and the voltage relief load R1. The voltage relief load R1 can consume the charge stored in the capacitive load FZ. When the battery management system (BMS) detects that the voltage between the first load connection terminal KM12 and the second load connection terminal KM22 is basically 0, the voltage relief process is completed, and then the voltage relief switch KM3 is opened. In addition, setting a second switch KM2 can ensure the normal operation of the power-off process. For example, if the first switch KM1 is damaged and cannot be disconnected, the power-off process can be achieved by disconnecting the second switch KM2.
[0060] The first switch KM1, the second switch KM2, and the pressure relief switch KM3 are all relays. A relay is an electronic control device with a control system (also known as an input circuit) and a controlled system (also known as an output circuit). The working principle of a relay mainly utilizes electromagnetic induction or certain physical effects to control the on / off state of a circuit. When the relay coil is energized, a magnetic field is generated around it. This magnetic field attracts the contacts, causing them to close or open, thereby controlling the on / off state of the circuit. For electromagnetic relays, the basic principle is to use electromagnetic effects to control mechanical contacts to achieve the purpose of on / off switching. Specifically, when the coil is energized, the coil current generates a magnetic field, which attracts the armature to actuate and open / close the contacts. Solid-state relays, on the other hand, achieve electrical isolation and control of input and output through electronic components. This results in the first switch KM1, the second switch KM2, and the pressure relief switch KM3 all having two coil terminals.
[0061] The first switch KM1, the second switch KM2, and the pressure relief switch KM3 can also be contactors. Of course, in some other example embodiments of this disclosure, the first switch KM1, the second switch KM2, and the pressure relief switch KM3 can also be other switching devices with similar functions, which will not be described one by one here.
[0062] Reference Figure 3 As shown, Figure 3 The diagram only shows the connection relationships between the Battery Management System (BMS) and the coil terminals of the first switch KM1, the second switch KM2, and the pressure relief switch KM3. The connection relationships between the first switch KM1, the second switch KM2, and the pressure relief switch KM3 and other devices are not shown. The connection relationships between the first switch KM1, the second switch KM2, and the pressure relief switch KM3 and other devices are as follows: Figure 1 and Figure 2 As shown, the capacitive load relief circuit 10 may further include a battery management system (BMS). The BMS is electrically connected to the control terminals of the first switch KM1, the second switch KM2, and the relief switch KM3. Specifically, the BMS has a first output interface DO1, a second output interface DO2, a third output interface DO3, a fourth output interface DO4, a fifth output interface DO5, and a sixth output interface DO6. The first output interface DO1 and the second output interface DO2 can be electrically connected to the two coil terminals of the first switch KM1, the third output interface DO3 and the fourth output interface DO4 can be electrically connected to the two coil terminals of the second switch KM2, and the fifth output interface DO5 and the sixth output interface DO6 can be electrically connected to the two coil terminals of the relief switch KM3. The BMS can control the closing or opening of the first switch KM1, the second switch KM2, and the relief switch KM3.
[0063] The Battery Management System (BMS) is also electrically connected to the first power connection terminal KM11, the first load connection terminal KM12, the second power connection terminal KM21, and the second load connection terminal KM22. Specifically, the BMS has a first input interface DI1, a second input interface DI2, a third input interface DI3, and a fourth input interface DI4. The first input interface DI1 can be electrically connected to the first power connection terminal KM11, the second input interface DI2 can be electrically connected to the first load connection terminal KM12, the third input interface DI3 can be electrically connected to the second power connection terminal KM21, and the fourth input interface DI4 can be electrically connected to the second load connection terminal KM22. The BMS can collect the voltages at the first power connection terminal KM11, the first load connection terminal KM12, the second power connection terminal KM21, and the second load connection terminal KM22, and then use the collected voltages to control the closing or opening of the first switch KM1, the second switch KM2, and the pressure relief switch KM3.
[0064] The battery management system (BMS) may also include a positive power interface DC+ and a negative power interface DC-, which are electrically connected to a DC power supply, allowing the BMS to be powered by the DC power supply.
[0065] Of course, in some other example embodiments of this disclosure, the first switch KM1, the second switch KM2, and the pressure relief switch KM3 can be manual switches. In this case, the battery management system (BMS) may not be set up, or the battery management system (BMS) may be set up, but the first switch KM1, the second switch KM2, and the pressure relief switch KM3 may not be electrically connected to the battery management system (BMS).
[0066] In some exemplary embodiments of this disclosure, reference is made to Figure 1 and Figure 2 As shown, the capacitive load relief circuit 10 may also include a pre-charge circuit 101, which is electrically connected to the first switch KM1 and is used to pre-charge the first load connection terminal KM12.
[0067] Specifically, refer to Figure 1 As shown, the precharge circuit 101 may include a precharge switch KM4 and a precharge load R2. The precharge switch KM4 and the precharge load R2 are connected in series, and the precharge switch KM4 and the precharge load R2 are connected in parallel with the first switch KM1. That is, the precharge switch KM4 and the precharge load R2 are connected in series and then connected in parallel with the first switch KM1. Specifically, one end of the precharge switch KM4 is electrically connected to the first power connection terminal KM11, and the other end of the precharge switch KM4 is electrically connected to one end of the precharge load R2. The other end of the precharge load R2 is electrically connected to the first load connection terminal KM12. This configuration allows for pre-charging of the first load connection terminal KM12, preventing excessive current from the first switch KM1 at the moment of power-on, which could damage the first switch KM1.
[0068] The power-on process in this example implementation is as follows: First, close the second switch KM2, then close the pre-charge switch KM4 to pre-charge the first load connection terminal KM12. When the battery management system (BMS) detects that the voltage between the first load connection terminal KM12 and the second load connection terminal KM22 is close to the power supply voltage, specifically, when the BMS detects that the voltage between the first load connection terminal KM12 and the second load connection terminal KM22 is greater than or equal to 90% of the power supply voltage, for example, when the BMS detects that the voltage between the first load connection terminal KM12 and the second load connection terminal KM22 is 93%, 95%, or 97.5% of the power supply voltage, etc., the first switch KM1 is closed, and then the pre-charge switch KM4 is opened to complete the power-on process.
[0069] The power-down pressure relief process in this example implementation is the same as that in the previous example implementation, and will not be described again here.
[0070] Reference Figure 2As shown, in some exemplary embodiments of this disclosure, the precharge circuit 101 may include a precharge switch KM4 and a precharge load R2. The precharge switch KM4 is electrically connected between the first power connection terminal KM11 and the positive terminal of the power supply DY. The precharge load R2 is connected in parallel with the first switch KM1. Specifically, one end of the precharge switch KM4 is electrically connected to the first power connection terminal KM11, and the other end of the precharge switch KM4 is electrically connected to the positive terminal of the power supply DY. One end of the precharge load R2 is electrically connected to the first load connection terminal KM12, and the other end of the precharge load R2 is electrically connected to the first power connection terminal KM11. With this configuration, the first load connection terminal KM12 can also be precharged, avoiding excessive current in the first switch KM1 at the moment of power-on, which could damage the first switch KM1.
[0071] The power-on process in this example implementation is as follows: First, close the second switch KM2, then close the pre-charge switch KM4 to pre-charge the first load connection terminal KM12. When the battery management system (BMS) detects that the voltage between the first load connection terminal KM12 and the second load connection terminal KM22 is close to the power supply voltage, specifically, when the BMS detects that the voltage between the first load connection terminal KM12 and the second load connection terminal KM22 is greater than or equal to 90% of the power supply voltage, for example, when the BMS detects that the voltage between the first load connection terminal KM12 and the second load connection terminal KM22 is 93%, 95%, or 97.5% of the power supply voltage, the first switch KM1 is closed to complete the power-on process.
[0072] The power-down process in this example implementation is as follows: First, disconnect the first switch KM1 and the pre-charge switch KM4, then disconnect the second switch KM2 to complete the power-down process; then close the pressure relief switch KM3 to connect the capacitive load FZ with the pressure relief load R1, and the pressure relief load R1 can consume the charge stored in the capacitive load FZ. When the battery management system (BMS) detects that the voltage between the first load connection terminal KM12 and the second load connection terminal KM22 is basically 0, the pressure relief process is completed and the pressure relief switch KM3 is disconnected.
[0073] The precharge switch KM4 can be a relay, thus also having two coil terminals. In this case, refer to... Figure 3 As shown, the battery management system (BMS) can have a seventh output interface DO7 and an eighth output interface DO8. The seventh output interface DO7 and the eighth output interface DO8 can be electrically connected to the two coil terminals of the precharge switch KM4 in a one-to-one correspondence. The battery management system (BMS) can control the closing or opening of the precharge switch KM4.
[0074] The precharge switch KM4 can also be a contactor. Of course, in some other example embodiments of this disclosure, the precharge switch KM4 can also be other switching devices with similar functions, which will not be described in detail here.
[0075] In some exemplary embodiments of this disclosure, reference is made to Figure 1 and Figure 2 As shown, the capacitive load relief circuit 10 may further include a fuse FU1, which is electrically connected between the power supply DY and the first switch KM1. Specifically, the fuse FU1 is electrically connected between the power supply DY and the first power supply connection terminal KM11. In the event of a short circuit, the fuse FU1 will melt due to the large current flowing through it generating significant heat. Therefore, the safety of the power supply system can be ensured by the fuse FU1.
[0076] In this example implementation, refer to Figure 1 and Figure 2 As shown, the capacitive load relief circuit 10 may further include a charging switch KM5, which is electrically connected between the charging interface CD and the positive terminal of the power supply DY. Specifically, the charging switch KM5 is electrically connected between the charging interface CD and the first power connection terminal KM11. The charging interface CD is also electrically connected to the negative terminal of the power supply DY. Specifically, the charging interface CD is also electrically connected to the second load connection terminal KM22. When the power supply DY needs to be charged, the charging switch KM5 and the second switch KM2 are closed, so that the power supply DY and the charging interface CD are connected, thereby realizing the charging of the power supply DY.
[0077] Based on the same inventive concept, this disclosure provides a power supply system, with reference to... Figure 1 and Figure 2 As shown, the power supply system may include a power supply DY, a capacitive load FZ, and a capacitive load relief circuit 10; the capacitive load relief circuit 10 is any of the capacitive load relief circuits for power supply systems described above, and the capacitive load relief circuit 10 is electrically connected between the power supply DY and the capacitive load FZ. The specific structure of the capacitive load relief circuit 10 has been described in detail above, and therefore will not be repeated here.
[0078] Compared with the prior art, the beneficial effects of the power supply system provided by the exemplary embodiments of the present invention are the same as the beneficial effects of the capacitive load relief circuit 10 provided by the above exemplary embodiments, and will not be repeated here.
[0079] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.
Claims
1. A capacitive load relief circuit for a power supply system, electrically connected between the power supply and the capacitive load, characterized in that, The capacitive load relief circuit includes: A first switch has a first power connection terminal and a first load connection terminal. The first power connection terminal is electrically connected to the positive terminal of the power supply, the first load connection terminal is electrically connected to one end of the capacitive load, and the other end of the capacitive load is electrically connected to the negative terminal of the power supply. A pressure relief switch and a pressure relief load are provided, wherein the pressure relief switch and the pressure relief load are connected in series and electrically connected between the first load connection terminal and the negative terminal of the power supply.
2. The capacitive load relief circuit for a power supply system according to claim 1, characterized in that, The capacitive load relief circuit also includes: The second switch has a second power connection terminal and a second load connection terminal. The second power connection terminal is electrically connected to the negative terminal of the power supply, and the second load connection terminal is electrically connected to the capacitive load. The pressure relief switch and the pressure relief load are connected in series at the second load connection terminal.
3. The capacitive load relief circuit for a power supply system according to claim 2, characterized in that, The pressure relief load is electrically connected between the pressure relief switch and the second load connection terminal.
4. The capacitive load relief circuit for a power supply system according to claim 2, characterized in that, The capacitive load relief circuit also includes: The battery management system is electrically connected to the control terminal of the first switch, the control terminal of the second switch, and the control terminal of the pressure relief switch, and is also electrically connected to the first power connection terminal, the first load connection terminal, the second power connection terminal, and the second load connection terminal.
5. The capacitive load relief circuit for a power supply system according to claim 1, characterized in that, The capacitive load relief circuit also includes: A pre-charge circuit is electrically connected to the first switch, and the pre-charge circuit is used to pre-charge the first load connection terminal.
6. The capacitive load relief circuit for a power supply system according to claim 5, characterized in that, The pre-charge circuit includes: A precharge switch and a precharge load are provided, wherein the precharge switch and the precharge load are connected in series, and the precharge switch and the precharge load are connected in parallel with the first switch.
7. The capacitive load relief circuit for a power supply system according to claim 5, characterized in that, The pre-charge circuit includes: A pre-charge switch is electrically connected between the first power connection terminal and the positive terminal of the power source; The pre-charged load is connected in parallel with the first switch.
8. The capacitive load relief circuit for a power supply system according to claim 1, characterized in that, The capacitive load relief circuit also includes: A fuse is electrically connected between the power source and the first switch.
9. The capacitive load relief circuit for a power supply system according to claim 1, characterized in that, The capacitive load includes an electric motor.
10. A power supply system, characterized in that, include: power supply; Capacitive load; The capacitive load relief circuit is the capacitive load relief circuit for a power supply system as described in any one of claims 1 to 9, wherein the capacitive load relief circuit is electrically connected between the power supply and the capacitive load.