A battery pack power supply voltage switching circuit

Abstract

This application discloses a battery pack power supply voltage switching circuit, including several control board power supply circuits and a battery pack power supply circuit. The battery pack power supply circuit includes a power converter. The several control board power supply circuits are respectively provided with several first isolation elements to be connected to the battery pack power supply circuit. The control board power supply circuit includes an input circuit, a second isolation element, and an output circuit. The second isolation element is adapted to isolate the input circuit from the input circuit. The battery pack power supply circuit is provided with a power converter. When different input circuits input different level signals, the signals are output to the power converter after two isolations by the first isolation element and the second isolation element, so as to realize the switching of different power supply voltages.

Description

Technical Field

[0001] This application relates to the field of power supply control board technology, and in particular to a battery pack power supply voltage switching circuit. Background Technology

[0002] Currently, battery swapping stations control the charging of battery packs via a charging control board within the charging cabinet. This charging control board requires different external circuitry configurations for different battery packs to ensure proper charging.

[0003] Because the power supply requirements of ordinary passenger car battery packs and heavy truck battery packs are different, the control boards were previously incompatible. To solve the problem of the control boards not being compatible between passenger cars and heavy trucks, we propose a battery pack power supply voltage switching circuit. Utility Model Content

[0004] The purpose of this application is to provide a battery pack power supply voltage switching circuit.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a battery pack power supply voltage switching circuit, comprising several control board power supply circuits and a battery pack power supply circuit. The battery pack power supply circuit includes a power converter. Several control board power supply circuits are respectively provided with several first isolation elements to be connected to the battery pack power supply circuit. The control board power supply circuit includes an input circuit, a second isolation element, and an output circuit. The second isolation element is adapted to isolate the input circuit from the input circuit. The battery pack power supply circuit is provided with a power converter. When different input circuits input different level signals, the signals are output to the power converter after two isolations by the first isolation element and the second isolation element, so as to output different power supply voltages accordingly.

[0006] As a preferred embodiment, the second isolation element is configured as an optocoupler, the input circuit is provided with a light-emitting diode, the input circuit is provided with a phototransistor, and the current input by the input circuit turns on the light-emitting diode to turn on the input circuit.

[0007] As a preferred embodiment, the first isolation element is configured as a relay, the contactor of the relay is configured in the output circuit, and the contacts of the relay are configured in the battery pack power supply circuit.

[0008] As a preferred embodiment, the input circuit is provided with a current limiting element in series, which is suitable for outputting high-level signals and shielding low-level signals.

[0009] As a preferred embodiment, the current-limiting element is configured as a current-limiting resistor.

[0010] As a preferred embodiment, the power supply voltage on the input circuit side is 5V, the power supply voltage on the output circuit side is 12V, and the resistance value of the current limiting resistor is 680 ohms.

[0011] As a preferred embodiment, in the output circuit, the contactor of the relay is provided with a voltage stabilizing element connected in reverse parallel.

[0012] As a preferred embodiment, the voltage regulator is a Zener diode.

[0013] As a preferred embodiment, the optocoupler further includes at least one amplification module, wherein the phototransistor and the amplification module perform at least two signal amplifications.

[0014] As a preferred embodiment, the optocoupler further includes a freewheeling diode.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: By combining multiple control board power supply circuits and battery pack power supply circuits, passenger car batteries, including heavy truck battery packs, can use the same model of control board, increasing the control board's versatility and facilitating adaptation for heavy truck charging, thus enabling the development of subsequent new products. Furthermore, the use of first and second isolation components provides multiple layers of isolation within the circuit, ensuring compatibility with various output power supply functions while also prioritizing safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the combination of the control board power supply circuit and the battery pack power supply circuit.

[0017] Figure 2 This is a schematic diagram of the combination of another control board power supply circuit and battery pack power supply circuit.

[0018] In the diagram: 1. Second isolation element; 2. First isolation element; 3. Voltage regulator element; 4. Current limiting element; K1 and K3 are relays; U16 and U19 are optocouplers; D11 and D13 are Zener diodes; R99 and R103 are current limiting resistors. Detailed Implementation

[0019] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0020] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0021] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0022] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0023] Example: Reference Figure 1 This embodiment proposes a battery pack power supply voltage switching circuit, including several control board power supply circuits and a battery pack power supply circuit. The battery pack power supply circuit includes a power converter. Several control board power supply circuits are respectively equipped with several first isolation elements 2 to connect to the battery pack power supply circuit. Each control board power supply circuit includes an input circuit, a second isolation element 1, and an output circuit. The second isolation element 1 is adapted to isolate the input circuit from other input circuits. The battery pack power supply circuit is equipped with a power converter. When different input circuits input different level signals, the signals are isolated twice by the first isolation element 2 and the second isolation element 1 before being output to the power converter to correspond to different power supply voltages. By setting up several control board power supply circuits, the same control board can simultaneously accommodate multiple different voltage output requirements. This function relies on the inputs of different control board power supply circuits and the coordinated operation of the power converter, increasing the versatility of the circuit board. Simultaneously, the first isolation element 2 is used to separate the control board power supply circuit and the battery pack power supply circuit, and the second isolation element 1 further isolates the input and output circuits within the control board power supply circuit, thereby ensuring safety.

[0024] The preferred second isolation element 1 is configured as an optocoupler. The input circuit includes a light-emitting diode (LED) and a phototransistor. Current input from the input circuit activates the LED, thus turning on the input circuit. (Continue referring to...) Figure 1 The optocoupler also includes at least one amplification module, with the phototransistor and amplification module performing at least two signal amplifications. To ensure the circuit structure is protected from the effects of back electromotive force generated by electromagnetic induction, the optocoupler also includes a freewheeling diode. The optocoupler described above is preferably a TLP127 or TLP187 model.

[0025] Preferably, the first isolation element 2 is configured as a relay, with the relay contactor located in the output circuit and the relay contacts located in the battery pack power supply circuit. A preferred relay model is HF46F / 12-HS1T.

[0026] A current-limiting element 4 can be connected in series in the input circuit. The current-limiting element 4 is suitable for outputting high-level signals and shielding low-level signals. The current-limiting element 4 is configured as a current-limiting resistor. Preferably, in this embodiment, the power supply voltage on the input circuit side is set to 5V, and the power supply voltage on the output circuit side is 12V. In this environment, the preferred resistance value of the current-limiting resistor is 680 ohms.

[0027] In the output circuit, to reduce the impact of the reverse electromotive force generated by electromagnetic induction when the relay contactor is de-energized, a voltage regulator element 3 is connected in reverse parallel to the relay contactor. Preferably, the voltage regulator element 3 is a Zener diode, such as a diode with model number NRVA4007T3G.

[0028] Based on the above structure, a battery pack power supply circuit compatible with both 24V and 12V can be further proposed. The control board power supply circuit can be configured as two circuits. The aforementioned power converter can use an ISO POWER power supply, capable of converting the input voltage into the required output voltage. The two control board power supply circuits share the same ISO POWER. Each of the two control board power supply circuits has an input circuit and an output circuit, with optocouplers U16 and U19 (TLP127 or TLP187) placed between them respectively. The two input circuits are connected in series with 680-ohm resistors R99 and R103, respectively, and are each connected to a 5V power supply. The two output circuits are equipped with relays K1 and K3, respectively. Relays K1 and K3 are connected in reverse series with Zener diodes D11 and D13, respectively. Both output circuits are connected to a 12V power supply. The two control board power supply circuits operate on the same principle. When a signal is input from OUT0 or OUT2, it passes through current-limiting resistor R99 or R103 and connects to pin 3 of optocoupler U16 or U19. The LED turns on, causing the phototransistor to conduct. At this time, pin 6 of U16 / U19 connects to pin 6 of relay K1 / K3, closing the switch of K1 / K3 and thus enabling ISO POWER and ISO OUT to conduct, providing power for subsequent charging. The power supplies from OUT0 and OUT2 correspond to 12V and 24V respectively, thus achieving compatibility with both 12V and 24V power supplies on a single control board.

[0029] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A battery pack supply voltage switching circuit, characterized by, The system includes several control board power supply circuits and a battery pack power supply circuit. The battery pack power supply circuit includes a power converter. Each of the control board power supply circuits is equipped with several first isolation elements to connect to the battery pack power supply circuit. Each control board power supply circuit includes an input circuit, a second isolation element, and an output circuit. The second isolation element is adapted to isolate the input circuit from other circuits. The battery pack power supply circuit includes a power converter. When different level signals are input from different input circuits, they are output to the power converter after being isolated twice by the first isolation element and the second isolation element, so as to output different supply voltages.

2. The battery pack supply voltage switching circuit of claim 1, wherein, The second isolation element is configured as an optocoupler, the input circuit is configured with a light-emitting diode, the input circuit is configured with a phototransistor, and the current input by the input circuit turns on the light-emitting diode to turn on the input circuit.

3. The battery pack supply voltage switching circuit according to claim 1 or 2, wherein The first isolation element is configured as a relay, the contactor of the relay is configured in the output circuit, and the contacts of the relay are configured in the battery pack power supply circuit.

4. The battery pack supply voltage switching circuit of claim 2, wherein, The input circuit is equipped with a current limiting element connected in series. The current limiting element is suitable for outputting high-level signals and shielding low-level signals.

5. The battery pack supply voltage switching circuit of claim 4, wherein, The current-limiting element is set as a current-limiting resistor.

6. The battery pack supply voltage switching circuit of claim 5, wherein, The power supply voltage on the input circuit side is 5V, the power supply voltage on the output circuit side is 12V, and the resistance of the current limiting resistor is 680 ohms.

7. The battery pack supply voltage switching circuit of claim 3, wherein, In the output circuit, the contactor of the relay is provided with a voltage stabilizing element connected in reverse parallel.

8. The battery pack supply voltage switching circuit of claim 7, wherein, The voltage regulator is configured as a Zener diode.

9. The battery pack supply voltage switching circuit of claim 2, wherein, The optocoupler further includes at least one amplification module, and the phototransistor and the amplification module perform at least two signal amplifications.

10. The battery pack supply voltage switching circuit of claim 9, wherein, The optocoupler also includes a freewheeling diode.

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