A load driving circuit, BMU board and energy storage battery system

Abstract

The utility model discloses a kind of load driving circuit, BMU board and energy storage battery system, can be used to drive different rated current load, comprising: signal detection circuit, drive voltage circuit and drive MOS tube;Signal detection circuit is used to receive control signal, and according to control signal control drive voltage circuit conduction or open;Drive voltage circuit is connected with the gate of drive MOS tube, and when conduction, it is used to provide drive voltage to drive MOS tube;Drive MOS tube source ground and its drain electrode is connected with load, for controlling the working state of load;Drive MOS tube works in saturation zone under the drive of drive voltage, and drain electrode current is greater than or equal to the maximum value of rated current;Drive MOS tube is high-power MOS tube.The driving circuit, BMU board and energy storage battery system adopt high-power MOS tube as drive MOS tube and drain electrode current Id greater than or equal to the maximum value of rated current when working in saturation zone under the drive of this drive voltage, and driving current range is wide, suitable for a variety of load occasions.

Description

Technical Field

[0001] This utility model relates to the field of drive circuit technology, and in particular to a load drive circuit, a BMU board, and an energy storage battery system. Background Technology

[0002] Energy storage battery systems include various loads, such as control coils of relays and circuit breakers, and heat dissipation loads such as fans. These loads have significantly different current ranges. For example, the control coil current of a 24V relay is typically between 10mA and 60mA, and the rated operating current of a 24V relay contact is 5A or 20A. When multiple fans are connected in parallel, the current can even range from tens of milliamps to tens of amps. However, the BMU (Battery Management Unit) of a typical energy storage battery uses an MCU (Microcontroller Unit) or an AFE (Analog Front End) as its controller, which has limited driving capability and cannot drive high-current loads.

[0003] Current technologies typically employ multiple drive circuit interfaces with varying current ranges to control different load operating states. This results in suboptimal utilization of load interface resources and an inability to adapt to the changing load requirements of various loads in different scenarios. Furthermore, in systems such as energy storage battery systems, expansion interfaces are often provided in the controller for subsequent connection and driving of unknown loads. Existing drive circuit interfaces limit the types of loads that can be connected, making them unsuitable for various load applications with different current ranges. Summary of the Invention

[0004] To improve the driving current range of the drive circuit and make it applicable to various load system applications, this utility model proposes a load drive circuit, a BMU board, and an energy storage battery system.

[0005] Based on the above objectives, on the one hand, this utility model provides a load driving circuit that can drive loads with different rated currents, including: a signal detection circuit, a driving voltage circuit, and a driving MOSFET; the signal detection circuit is used to receive control signals and control the driving voltage circuit to be turned on or off according to the control signals; the driving voltage circuit is connected to the gate of the driving MOSFET and is used to provide a driving voltage to the driving MOSFET when it is turned on; the source of the driving MOSFET is grounded and its drain is connected to the load to control the working state of the load; the drain current of the driving MOSFET when it is working in the saturation region under the driving voltage is greater than or equal to the maximum value of the rated current; the driving MOSFET is a high-power MOSFET.

[0006] Optionally, the maximum value of the rated current is 20A, and the driving current range of the load driving circuit is 0-20A.

[0007] Optionally, the signal detection circuit includes: a detection MOS transistor; the gate of the detection MOS transistor is connected to a control port to receive a control signal, its source is grounded, and its drain is connected to a drive voltage circuit.

[0008] Optionally, when the control signal is high, the MOSFET is detected to be turned on and the driving voltage circuit is controlled to turn on to output the driving voltage; when the control signal is low, the MOSFET is detected to be turned off and the driving voltage circuit is controlled to turn off to stop outputting the driving voltage.

[0009] Optionally, the signal detection circuit further includes: a first resistor, a second resistor, and a third resistor; the gate of the detection MOS transistor is connected to the control port through the first resistor, its source is connected to the control port through the second resistor, and its drain is connected to the voltage drive circuit through the third resistor.

[0010] Optionally, the voltage driving circuit includes: a voltage MOSFET, a fourth resistor, a fifth resistor, and a sixth resistor; the gate of the voltage MOSFET is connected to the third resistor, its source is connected to a power supply, and its drain is grounded through the fourth resistor; the gate and source of the voltage MOSFET are also connected to the two ends of the fifth resistor, and its drain also outputs a driving voltage to the gate of the driving MOSFET through the sixth resistor.

[0011] On another front, this utility model provides a BMU board, comprising: the aforementioned load drive circuit and an MCU; one end of the load drive circuit is connected to the MCU to receive control signals, and the other end serves as a load interface for connecting to a load.

[0012] In another aspect, this utility model provides an energy storage battery system, including: the aforementioned BMU board, battery pack, fan module, power circuit, and relay; the BMU board is provided with at least one load interface; the fan module is used to dissipate heat from the battery pack; the fan module is connected to the power circuit through relay contacts; the load interface is connected to the low-voltage control terminal of the relay coil for controlling the operating state of the fan module.

[0013] Optionally, there are multiple BMU boards, battery packs, fan modules, and relays. Each fan module is connected in series with each relay contact. The load interface of each BMU is connected to a low-voltage control terminal of a relay coil to independently control the working state of each fan module. Multiple fan modules connected in series with the relay contacts are connected in parallel to each other and then connected to the power supply circuit.

[0014] Optionally, there are multiple load interfaces, and the load interfaces also serve as reserved interfaces for connecting different loads as needed.

[0015] This utility model has the following beneficial effects: 1. The load drive circuit, BMU board, and energy storage system of this utility model use a high-power MOSFET as a drive MOSFET to control the working state of the load. The drive voltage circuit outputs a drive voltage. When the drive MOSFET is working in the saturation region under the drive voltage, the drain current Id is greater than or equal to the maximum value of the rated current. That is, the drain current of the drive MOSFET under the drive voltage can work in the range of 0-Id. In other words, the drive current range of this load drive circuit is very wide, which can meet the needs of driving and controlling different loads with very large differences in rated current.

[0016] 2. The signal detection circuit of the load drive circuit of this utility model is equipped with a detection MOSFET, which can realize the drive control of the MCU and other low voltage level signals by detecting the high and low level states of the control signal; at the same time, the drive voltage circuit is equipped with a voltage MOSFET connected to the signal detection circuit, and outputs a drive voltage that meets the drive current range of the drive MOSFET according to the state of the control signal; that is, a wide drive current range is achieved by using three MOSFETs to achieve low level control, simplifying the circuit structure and reducing costs.

[0017] 3. The battery management system of this utility model is equipped with a load interface that can be used as a reserved interface, which can drive a 0-20A load and facilitate the connection of various loads to the energy storage battery system. Attached Figure Description

[0018] Figure 1 This is a load drive circuit diagram provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the BMU board structure provided in this embodiment of the utility model; Figure 3 This is a schematic diagram of the energy storage battery system provided in an embodiment of the present invention.

[0019] Explanation of icon numbers: 10. BMU board; 1. Load drive circuit; 2. MCU; 20. Battery pack; 30. Power supply circuit. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0021] Reference Figure 1A load driving circuit 1, capable of driving loads with different rated currents, includes: a signal detection circuit, a driving voltage circuit, and a driving MOSFET Q1; the signal detection circuit receives a control signal SW1 and controls the driving voltage circuit to turn on or off according to the control signal SW1; the driving voltage circuit is connected to the gate of the driving MOSFET Q1 and provides a driving voltage to the driving MOSFET Q1 when it is on; the source of the driving MOSFET Q1 is grounded to GND and its drain is connected to the load to control the operating state of the load; the drain current Id of the driving MOSFET Q1 when it operates in the saturation region under the driving voltage is greater than or equal to the maximum value of the rated current; the driving MOSFET Q1 is a high-power MOSFET.

[0022] Furthermore, the maximum value of the rated current is 20A, the driving current range of the load driving circuit is 0mA-20A, and the model of the driving MOSFET Q1 is NCE6020 T0-252-2N.

[0023] The signal detection circuit includes: a detection MOSFET Q2; the gate of the detection MOSFET Q2 is connected to a control port to receive a control signal, the source is grounded, and the drain is connected to a drive voltage circuit; when the control signal is high, the detection MOSFET Q2 is turned on and controls the drive voltage circuit to turn on and output a drive voltage; when the control signal is low, the detection MOSFET Q2 is turned off and controls the drive voltage circuit to turn off and stop outputting the drive voltage.

[0024] The signal detection circuit further includes: a first resistor R1, a second resistor R2, and a third resistor R3; the gate of the detection MOSFET Q2 is connected to the control port through the first resistor R1, the source is connected to the control port through the second resistor R2, and the drain is connected to the voltage drive circuit through the third resistor R3; the control port is used to transmit control signals, which are level signals; furthermore, the detection MOSFET Q2 is a low-power MOSFET with a low threshold voltage; specifically, the model of the detection MOSFET Q2 is: L2N7002SLTIG S0T23-MOS-N.

[0025] The voltage driving circuit includes: a voltage MOSFET Q3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; the gate of the voltage MOSFET Q3 is connected to the signal detection circuit, i.e., connected to the third resistor R3, the source is connected to the power supply VIN, the drain is grounded through the fourth resistor R4, and the gate and source are respectively connected to the two ends of the fifth resistor R5. The drain also outputs a driving voltage to the gate of the driving MOSFET Q1 through the sixth resistor R6; the power supply VIN is a 24V+ power supply.

[0026] Furthermore, the voltage MOSFET Q3 is a low-power MOSFET; specifically, the voltage MOSFET Q3 is model BSS84S0T-23-MOSP.

[0027] Reference Figure 2 A BMU board 10 includes: the aforementioned load drive circuit 1 and MCU 2; one end of the load drive circuit 1 is connected to the MCU 2 to receive control signals, and the other end serves as a load interface for connecting to a load.

[0028] Furthermore, the load drive circuit is connected to the control port of the MCU; the control port of the MCU is an I / O port.

[0029] Reference Figure 3 An energy storage battery system includes: a BMU board 10, a battery pack 20, a fan module, a power circuit 30, and a relay J1; the BMU board 10 is provided with at least one load interface LSD1; the fan module is used to dissipate heat from the battery pack; the fan module is connected to the power circuit 30 through relay contacts; the load interface LSD1 is connected to the low-voltage control terminal of the relay coil and is used to control the operating state of the fan module.

[0030] The relay J1, BMU board 10, battery pack 20 and fan module are multiple in number. Each fan module is connected in series with each relay contact. The load interface LSD1 of each BMU is connected to a low-voltage control terminal of a relay coil to independently control the working state of each fan module. The multiple fan modules and relay contacts connected in series are connected in parallel to each other and then connected to the power supply circuit.

[0031] Furthermore, the fan module is formed by two fans M1 and M2 connected in parallel.

[0032] In another embodiment, there is one relay J1, and multiple BMU board 10, battery pack 20 and fan modules. The multiple fan modules are connected in parallel and then connected to the power circuit through relay contacts.

[0033] The system also includes multiple load interfaces, with the load interface LSD2 serving as a reserved interface for connecting different loads as needed.

[0034] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A load driving circuit, characterized in that, This device can drive loads with different rated currents and includes: a signal detection circuit, a drive voltage circuit, and a drive MOSFET; the signal detection circuit receives control signals and controls the drive voltage circuit to turn on or off according to the control signals; the drive voltage circuit is connected to the gate of the drive MOSFET and provides a drive voltage to the drive MOSFET when it is on; the source of the drive MOSFET is grounded and its drain is connected to the load to control the operating state of the load; the drain current of the drive MOSFET when it operates in the saturation region under the drive voltage is greater than or equal to the maximum value of the rated current; the drive MOSFET is a high-power MOSFET.

2. The load drive circuit according to claim 1, characterized in that, The maximum value of the rated current is 20A, and the driving current range of the load driving circuit is 0-20A.

3. The load drive circuit according to claim 1, characterized in that, The signal detection circuit includes: a detection MOS transistor; the gate of the detection MOS transistor is connected to a control port to receive a control signal, its source is grounded, and its drain is connected to a drive voltage circuit.

4. The load drive circuit according to claim 3, characterized in that, When the control signal is high, the MOSFET is detected to be turned on and the drive voltage circuit is controlled to turn on to output the drive voltage; when the control signal is low, the MOSFET is detected to be turned off and the drive voltage circuit is controlled to turn off to stop outputting the drive voltage.

5. The load drive circuit according to claim 4, characterized in that, The signal detection circuit further includes a first resistor, a second resistor, and a third resistor; the gate of the detection MOS transistor is connected to the control port through the first resistor, its source is connected to the control port through the second resistor, and its drain is connected to the voltage drive circuit through the third resistor.

6. The load drive circuit according to claim 5, characterized in that, The voltage driving circuit includes: a voltage MOSFET, a fourth resistor, a fifth resistor, and a sixth resistor; the gate of the voltage MOSFET is connected to the third resistor, its source is connected to a power supply, and its drain is grounded through the fourth resistor; the gate and source of the voltage MOSFET are also connected to the two ends of the fifth resistor, and its drain also outputs a driving voltage to the gate of the driving MOSFET through the sixth resistor.

7. A BMU board, characterized in that, include: The load drive circuit and MCU as described in any one of claims 1-6; one end of the load drive circuit is connected to the MCU to receive control signals, and the other end serves as a load interface for connecting to the load.

8. An energy storage battery system, characterized in that, include: The BMU board, battery pack, fan module, power circuit, and relay as described in claim 7; the BMU board is provided with at least one load interface; the fan module is used to dissipate heat from the battery pack; the fan module is connected to the power circuit through relay contacts; the load interface is connected to the low-voltage control terminal of the relay coil for controlling the operating state of the fan module.

9. The energy storage battery system according to claim 8, characterized in that, The BMU board, battery pack, fan module, and relay are multiple in number. Each fan module is connected in series with each relay contact. The load interface of each BMU is connected to the low-voltage control terminal of a relay coil to independently control the working state of each fan module. The multiple fan modules and relay contacts connected in series are then connected in parallel to the power supply circuit.

10. The energy storage battery system according to claim 8, characterized in that, There are multiple load interfaces, and each load interface also serves as a reserved interface for connecting different loads as needed.

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