BMS startup and shutdown circuit and electronic equipment

Abstract

The utility model belongs to the technical field of power electronics, and particularly relates to a BMS startup and shutdown circuit and electronic device.The BMS startup and shutdown circuit comprises a key circuit, a startup circuit, a control circuit and a voltage conversion circuit, and the key circuit is used for sending a startup signal to the startup circuit when a first key is triggered; the input end of the starting-up circuit is connected with a first voltage source and is used for outputting an enable signal to the voltage conversion circuit when receiving the starting-up signal; the input end of the voltage conversion circuit is connected to a second voltage source, and the voltage conversion circuit is used for converting the second voltage source into a BMS system voltage source to wake up the control circuit when receiving an enable signal; the control circuit is used for continuously providing a self-locking signal to the voltage conversion circuit after being awakened; the voltage of the first voltage source is smaller than that of the second voltage source, the number of circuit elements can be reduced, and the circuit cost is reduced.

Description

Technical Field

[0001] This application belongs to the field of power electronics technology, and in particular relates to a BMS switching circuit and electronic equipment. Background Technology

[0002] The power-on control of a BMS (Battery Management System) typically uses a PMOS transistor as the main switch (e.g., Figure 1 The switch Q11 shown in the diagram requires a PMOS transistor with high voltage withstand capability (greater than 100V), resulting in high device cost. It also requires numerous external components, occupying a large PCB space. Furthermore, the selection and heat dissipation of the MOS transistor in high-voltage, high-current scenarios further increase design complexity and cost. Utility Model Content

[0003] In view of this, the present application provides a BMS power-on / off circuit and electronic device, which aims to solve the technical problem of circuit complexity and high cost caused by the selection of switching transistors in the prior art BMS power-on / off circuit.

[0004] The first aspect of this application provides a BMS power-on / off circuit, including a button circuit, a power-on circuit, a control circuit, and a voltage conversion circuit;

[0005] The button circuit includes a first button, and the button circuit is connected to the power-on circuit, and is used to send a power-on signal to the power-on circuit when the first button is triggered;

[0006] The input terminal of the power-on circuit is connected to a first voltage source, and the output terminal of the power-on circuit is connected to the control terminal of the voltage conversion circuit. The power-on circuit is used to output an enable signal to the voltage conversion circuit when it receives the power-on signal.

[0007] The input terminal of the voltage conversion circuit is connected to a second voltage source, and the output terminal of the voltage conversion circuit is connected to the control circuit. The voltage conversion circuit is used to convert the second voltage source into a BMS system voltage source to wake up the control circuit when it receives the enable signal.

[0008] The control circuit is used to continuously provide a self-locking signal to the voltage conversion circuit after being awakened;

[0009] The voltage of the first voltage source is less than the voltage of the second voltage source.

[0010] In one embodiment, the power-on circuit includes a first switching transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first diode. The emitter of the first switching transistor is connected to the first voltage source, the base of the first switching transistor is connected to the button circuit, the first resistor is connected between the base and emitter of the first switching transistor, the collector of the first switching transistor is connected to the positive terminal of the first diode through the second and third resistors, and the negative terminal of the first diode is connected to the voltage conversion circuit.

[0011] In one embodiment, the button circuit includes a first button, a first terminal of which is grounded, and a second terminal of which is connected to the base of the first switching transistor through the fourth resistor. When the first button is pressed, the first switching transistor is turned on, so that the power-on circuit outputs the enable signal.

[0012] In one embodiment, the first button is a surface-mount tactile switch.

[0013] In one embodiment, the first switching transistor is a PNP transistor.

[0014] In one embodiment, the voltage conversion circuit includes a DC-DC buck chip, the enable pin of which is connected to the power-on circuit and the control circuit to receive the enable signal and the latching signal.

[0015] In one embodiment, the second voltage source is provided by an energy storage battery, and the voltage conversion circuit is used to step down the second voltage source and output it as power to the BMS system.

[0016] In one embodiment, the voltage of the second voltage source is greater than or equal to 100V, and the voltage of the BMS system voltage source is less than or equal to 12V.

[0017] In one embodiment, the withstand voltage of the first switch is less than the voltage of the second voltage source.

[0018] A second aspect of this application provides an electronic device, including an energy storage battery and a BMS power-on / off circuit provided in the first aspect of this application, wherein the energy storage battery is used to provide the second voltage source.

[0019] The beneficial effects of this application embodiment are as follows: by setting a button circuit, a power-on signal is sent to the power-on circuit when the first button is triggered. The power-on circuit is connected to the first voltage source. When the power-on circuit receives the power-on signal, it outputs an enable signal to the voltage conversion circuit. After the voltage conversion circuit starts, it converts the second voltage source into the BMS system voltage source to wake up the system and realize power-on. The control circuit provides a self-locking signal to the voltage conversion circuit when the system is powered on to realize that the voltage conversion circuit maintains the wake-up state. By setting the voltage of the first voltage source to be less than the voltage of the second voltage source, the high-voltage PMOS transistor and its peripheral circuit in the prior art are eliminated, the number of components is reduced, the circuit cost is reduced, and the board space is saved. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the BMS power-on / off circuit in the prior art;

[0022] Figure 2 A schematic diagram of a BMS power-on / off circuit provided in an embodiment of this application;

[0023] Figure 3 The circuit diagram is shown for a BMS power-on / off circuit provided in one embodiment of this application. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0027] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] Please see Figure 2 and Figure 3 As shown in the figure, this application embodiment provides a BMS power-on / off circuit, including a button circuit 100, a power-on circuit 200, a control circuit 300, and a voltage conversion circuit 400.

[0029] The button circuit 100 includes a first button SW1. The button circuit 100 is connected to the power-on circuit 200 and is used to send a power-on signal to the power-on circuit 200 when the first button SW1 is triggered. The input terminal of the power-on circuit 200 is connected to the first voltage source BAT+. The output terminal of the power-on circuit 200 is connected to the control terminal of the voltage conversion circuit 400. The power-on circuit 200 is used to output an enable signal CTRL to the voltage conversion circuit 400 when it receives the power-on signal.

[0030] The input terminal of the voltage conversion circuit 400 is connected to the second voltage source VIN, and the output terminal of the voltage conversion circuit 400 is connected to the control circuit 300. The voltage conversion circuit 400 is used to convert the second voltage source VIN into the BMS system voltage source VOUT to wake up the control circuit 300 when it receives the enable signal CTRL. The control circuit 300 is used to continuously provide the self-locking signal EN to the voltage conversion circuit 400 after being woken up.

[0031] Among them, the voltage of the first voltage source BAT+ is less than the voltage of the second voltage source VIN.

[0032] Understandably, when the BMS system needs to be powered on, pressing the first button SW1 allows the BMS power-on / off circuit to provide the BMS system voltage source VOUT to wake up the control circuit 300, thus enabling the BMS system to power on. When the BMS system needs to be powered off, pressing the first button SW1 again allows the control circuit 300 to detect the button trigger signal KEYDEC and determine whether power off is required. If power off is required, the control circuit 300 stops outputting the self-locking signal EN, thus powering off the BMS system.

[0033] The BMS power-on / off circuit provided in this application embodiment, by setting a button circuit 100, sends a power-on signal to the power-on circuit 200 when the first button SW1 is triggered. The power-on circuit 200 is connected to the first voltage source BAT+. When the power-on circuit 200 receives the power-on signal, it outputs an enable signal CTRL to the voltage conversion circuit 400. After the voltage conversion circuit 400 starts, it converts the second voltage source VIN to the BMS system voltage source VOUT to wake up the system and realize power-on. The control circuit 300 provides a self-locking signal EN to the voltage conversion circuit 400 when the system is powered on to keep the voltage conversion circuit 400 in a wake-up state. By setting the voltage of the first voltage source BAT+ to be less than the voltage of the second voltage source VIN, the high-voltage PMOS transistor and its peripheral circuits required in the prior art to adapt to the large voltage of the second voltage source VIN are eliminated, greatly reducing the number of components, reducing circuit costs, and saving circuit board space.

[0034] In one embodiment, please refer to Figure 2 and Figure 3 The power-on circuit 200 includes a first switching transistor Q1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first diode D1. The emitter of the first switching transistor Q1 is connected to the first voltage source BAT+, the base of the first switching transistor Q1 is connected to the button circuit 100, the first resistor R1 is connected between the base and emitter of the first switching transistor Q1, the collector of the first switching transistor Q1 is connected to the positive terminal of the first diode D1 through the second resistor R2 and the third resistor R3, and the negative terminal of the first diode D1 is connected to the voltage conversion circuit 400. The first diode D1 is used to prevent current backflow.

[0035] In one embodiment, please refer to Figure 2 and Figure 3 The button circuit 100 includes a first button SW1. The first end of the first button SW1 is grounded, and the second end of the first button SW1 is connected to the base of the first switching transistor Q1 through a fourth resistor R4. When the first button SW1 is pressed, the base of the first switching transistor Q1 is grounded and thus turned on, so that the power-on circuit 200 outputs an enable signal CTRL.

[0036] In one embodiment, please refer to Figure 2 and Figure 3 The first button SW1 is a surface-mount tactile switch. Tactile switches do not require high voltage resistance and can be triggered directly through low-cost mechanical contacts or electronic switches, which significantly reduces the cost of components. Surface-mount packaging occupies less space and saves circuit board space.

[0037] In one embodiment, please refer to Figure 2 and Figure 3 The first switching transistor Q1 is a PNP transistor, which turns on when the base voltage of the first switching transistor Q1 is lower than the emitter voltage.

[0038] In one embodiment, please refer to Figure 2 and Figure 3 The voltage conversion circuit 400 includes a DC-DC step-down chip. The enable pin of the DC-DC step-down chip is connected to the power-on circuit 200 and the control circuit 300 to receive the enable signal CTRL and the self-locking signal EN. The DC-DC step-down chip starts working when it receives the enable signal CTRL or the self-locking signal EN.

[0039] In one embodiment, the signal of the DC buck converter chip is ESOP-8.

[0040] In one embodiment, please refer to Figure 2 and Figure 3 The second voltage source VIN is provided by the energy storage battery, and the voltage conversion circuit 400 is used to step down the second voltage source VIN to output the BMS system power supply VOUT. In some embodiments, the first voltage source BAT+ is provided by a separately configured battery pack, or it can be provided by the voltage of the energy storage battery after being stepped down.

[0041] In one embodiment, please refer to Figure 2 and Figure 3 The voltage of the second voltage source VIN is greater than or equal to 100V, and the voltage of the BMS system voltage source VOUT is less than or equal to 12V.

[0042] In one embodiment, please refer to Figure 2 and Figure 3 The withstand voltage of the first switching transistor Q1 is less than the voltage of the second voltage source VIN. In some embodiments, the withstand voltage of the first switching transistor Q1, i.e., the breakdown voltage between its collector and emitter, is 40V.

[0043] In one embodiment, please refer to Figure 2 and Figure 3The button circuit 100 also includes a third diode D3, a fourth diode D4, and an eighth resistor R8. The positive terminal of the third diode D3 is connected to the base of the first switching transistor Q1, and the negative terminal of the third diode D3 is connected to one end of the first button SW1. The positive terminal of the fourth diode D4 is connected to a 3.3V regulated power source through the eighth resistor, and the negative terminal of the fourth diode D4 is connected to one end of the first button SW1.

[0044] In one embodiment, please refer to Figure 2 and Figure 3 The button circuit 100 also includes a second switching transistor Q2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a fifth diode D5. For detailed connection relationships, please refer to [link to details]. Figure 3 This will not be elaborated upon here.

[0045] The second aspect of this application provides an electronic device, including an energy storage battery, and also includes a BMS power-on / off circuit provided in the first aspect of this application, wherein the energy storage battery is used to provide a second voltage source.

[0046] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A BMS power-on / off circuit, characterized in that, This includes button circuits, power-on circuits, control circuits, and voltage conversion circuits; The button circuit includes a first button, and the button circuit is connected to the power-on circuit, and is used to send a power-on signal to the power-on circuit when the first button is triggered; The input terminal of the power-on circuit is connected to a first voltage source, and the output terminal of the power-on circuit is connected to the control terminal of the voltage conversion circuit. The power-on circuit is used to output an enable signal to the voltage conversion circuit when it receives the power-on signal. The input terminal of the voltage conversion circuit is connected to a second voltage source, and the output terminal of the voltage conversion circuit is connected to the control circuit. The voltage conversion circuit is used to convert the second voltage source into a BMS system voltage source to wake up the control circuit when it receives the enable signal. The control circuit is used to continuously provide a self-locking signal to the voltage conversion circuit after being awakened; The voltage of the first voltage source is less than the voltage of the second voltage source.

2. The BMS switching circuit of claim 1, wherein, The power-on circuit includes a first switching transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first diode. The emitter of the first switching transistor is connected to the first voltage source, the base of the first switching transistor is connected to the button circuit, the first resistor is connected between the base and emitter of the first switching transistor, the collector of the first switching transistor is connected to the positive terminal of the first diode through the second and third resistors, and the negative terminal of the first diode is connected to the voltage conversion circuit.

3. The BMS switching circuit of claim 2, wherein, The button circuit includes a first button, a first terminal of which is grounded, and a second terminal of which is connected to the base of the first switching transistor through the fourth resistor. When the first button is pressed, the first switching transistor is turned on, so that the power-on circuit outputs the enable signal.

4. The BMS switching circuit of claim 3, wherein, The first button is a surface mount tactile switch.

5. The BMS switching circuit of claim 3, wherein, The first switching transistor is a PNP transistor.

6. The BMS switching circuit of claim 2, wherein, The voltage conversion circuit includes a DC-DC step-down chip, and the enable pin of the step-down chip is connected to the power-on circuit and the control circuit to receive the enable signal and the self-locking signal.

7. The BMS shutdown circuit of claim 6, wherein, The second voltage source is provided by an energy storage battery, and the voltage conversion circuit is used to step down the second voltage source and output the power supply of the BMS system.

8. The BMS shutdown circuit of claim 7, wherein, The voltage of the second voltage source is greater than or equal to 100V, and the voltage of the BMS system voltage source is less than or equal to 12V.

9. The BMS shutdown circuit of claim 7, wherein, The withstand voltage of the first switching transistor is less than the voltage of the second voltage source.

10. An electronic device comprising an energy storage battery, characterized in that It also includes the BMS power-on / off circuit according to any one of claims 1 to 9, wherein the energy storage battery is used to provide the second voltage source.

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