Power supply circuit of scooter main control board

Abstract

The utility model relates to the technical field of scooters, in particular to a power supply circuit of a scooter main control board. The circuit comprises a controllable switch, a first voltage conversion circuit and a second voltage conversion circuit. The control end of the controllable switch is adaptively connected with a key SW, the input end of the controllable switch is connected with a lithium battery VBatt of the scooter, the output end of the controllable switch is adaptively connected with a first voltage conversion circuit and a second voltage conversion circuit, the first voltage conversion circuit is adaptively connected with a main controller of the scooter main control board, and the second voltage conversion circuit is adaptively connected with a second controller of the scooter main control board. And the main controller is adaptively connected with the control end of the controllable switch. The control circuit is characterized in that the key SW is adaptively connected with a detection circuit, and the detection circuit is used for generating a key detection signal SWCHECK and sending the key detection signal SWCHECK to the main controller to detect whether the key SW is normal or not. The power supply circuit can detect the key state.

Description

Technical Field

[0001] This utility model relates to the field of scooter technology, specifically a power supply circuit for a scooter main control board. Background Technology

[0002] The power circuit of a scooter's main control board converts the lithium battery's voltage into the operating voltage for other components on the board. Its operation is as follows: when in use, the power circuit is activated by pressing a button, and then it converts the lithium battery's voltage into the operating voltage for the other components on the main control board. However, traditional scooter main control board power circuits lack a component for detecting button status; therefore, they cannot detect button status during operation, and it's impossible to determine whether the buttons are functioning correctly. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a power circuit for the main control board of a scooter, which can detect the status of the buttons.

[0004] To solve the above problems, the following technical solutions are provided:

[0005] The power circuit of the scooter main control board of this utility model includes a controllable switch, a first voltage conversion circuit, and a second voltage conversion circuit. A button SW is adapted to the control terminal of the controllable switch. The input terminal of the controllable switch is connected to the lithium battery VBatt of the scooter, and the output terminal is adapted to the first and second voltage conversion circuits. The first voltage conversion circuit is adapted to the main controller of the scooter main control board, and the main controller is adapted to the control terminal of the controllable switch. When the button SW is pressed, the controllable switch enters the conducting state, converting the power supply voltage of the lithium battery VBatt into a self-locking voltage Vclock. The self-locking voltage Vclock forms the operating voltage B+_MCU of the main controller through the first conversion circuit. The main controller is powered on and generates a self-locking signal CLOCK to control the controllable switch to be in the conducting state. The self-locking voltage Vclock forms a power supply voltage +15V through the second conversion circuit. A key feature is that a detection circuit is adapted to the button SW. The detection circuit generates a button detection signal SW_CHECK and sends it to the main controller to detect whether the button SW is functioning correctly.

[0006] The controllable switch is a PMOS transistor Q11, with its source being the input terminal, its drain being the output terminal, and its gate being the control terminal.

[0007] The source of the PMOS transistor Q11 is connected to one end of diode D1, one end of capacitor C37, and one end of resistor R98. The other ends of diode D1, capacitor C37, and resistor R98 are all connected to the gate of PMOS transistor Q11. The gate of PMOS transistor Q11 is connected to one end of resistor R74. The other end of resistor R74 is connected to the anode of diode D24 and the collector of transistor Q15. The cathode of diode D24 is connected to one end of button SW. The other end of button SW is connected to one end of resistor R75. The other end of resistor R75 is connected to the base of transistor Q15 and one end of resistor R40. The other end of resistor R40 is grounded. The emitter of transistor Q15 is grounded.

[0008] The base of the transistor Q15 is connected to one end of the resistor R80, and the other end of the resistor R80 is used to connect to the main controller to receive the self-locking signal CLOCK generated by the main controller.

[0009] The detection circuit includes a diode D10. The cathode of the diode D24 is connected to the cathode of the diode D10. The anode of the diode D10 is connected to the overprotection voltage Over Protect. The anode of the diode D10 is connected to one end of the resistor R46 and one end of the capacitor C63. The other end of the capacitor C63 is grounded. The other end of the resistor R46 forms the key detection signal SW_CHECK.

[0010] The +15V power supply voltage is connected to one end of resistor R23, the other end of resistor R23 is connected to one end of resistor R26, the other end of resistor R26 is grounded, and the end of resistor R23 connected to resistor R26 forms the overprotection voltage OverProtect.

[0011] The first voltage conversion circuit includes a resistor R137. One end of the resistor R137 is connected to the self-locking voltage Vclock, and the other end of the resistor R137 is connected to one end of the resistor R16 and one end of the capacitor C5. The other ends of the resistor R16 and the capacitor C5 are both grounded. The end of the resistor R137 connected to the resistor R16 forms the operating voltage B+_MCU.

[0012] The above approach has the following advantages:

[0013] Because the power circuit of the scooter main control board of this utility model has a detection circuit connected to the button SW, the detection circuit generates a button detection signal SW_CHECK and sends it to the main controller to detect whether the button SW is normal. This power circuit can detect the button status. When the button malfunctions and does not rebound, it can be known that the button is in an abnormal state, thus avoiding the situation where the button is malfunctioning during normal operation. Attached Figure Description

[0014] Figure 1 This is a circuit diagram of the power supply circuit of the scooter main control board of this utility model;

[0015] Figure 2 This is a circuit diagram of the first voltage conversion circuit in the power supply circuit of the scooter main control board of this utility model;

[0016] Figure 3 This is a circuit diagram of the second voltage conversion circuit in the power supply circuit of the scooter main control board of this utility model.

[0017] Figure 4 This is a circuit diagram of the main controller of the scooter's main control board. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] like Figure 4 As shown, the scooter's main control board uses an MCU of model LKS32MC071CBT8. The MCU is connected to peripheral circuits for driving its operation. The specific structure is existing technology and will not be described in detail here.

[0020] like Figures 1-4 As shown, the power circuit of the scooter main control board of this utility model includes a controllable switch 101, a first voltage conversion circuit 103, and a second voltage conversion circuit 104. A button SW is adapted to the control terminal of the controllable switch 101. The input terminal of the controllable switch 101 is connected to the scooter's lithium battery VBatt, and the output terminal is adapted to the first voltage conversion circuit 103 and the second voltage conversion circuit 104. The first voltage conversion circuit 103 is adapted to the main controller of the scooter's main control board, and the main controller is adapted to the control terminal of the controllable switch 101. When the button SW is pressed, the controllable switch 101 enters the conducting state, converting the power supply voltage of the lithium battery VBatt into a self-locking voltage Vclock. The self-locking voltage Vclock forms the main controller's operating voltage B+_MCU through the first conversion circuit. The main controller is powered on and starts, generating a self-locking signal CLOCK to control the controllable switch 101 to be in the conducting state. The self-locking voltage Vclock forms a power supply voltage +15V through the second conversion circuit. The button SW is connected to a detection circuit 102. The detection circuit 102 is used to generate a button detection signal SW_CHECK and send it to the main controller to detect whether the button SW is normal.

[0021] like Figure 1 , Figure 2 and Figure 4As shown, in this embodiment, the first voltage conversion circuit 103 includes a resistor R137. One end of the resistor R137 is connected to the latching voltage Vclock, and the other end of the resistor R137 is connected to one end of the resistor R16 and one end of the capacitor C5. The other ends of the resistor R16 and the capacitor C5 are both grounded. One end of the resistor R137 connected to the resistor R16 forms the operating voltage B+_MCU. The controllable switch 101 is a PMOS transistor Q11. The source of the PMOS transistor Q11 is the input terminal of the controllable switch 101, the drain of the PMOS transistor Q11 is the output terminal of the controllable switch 101, and the gate of the PMOS transistor Q11 is the control terminal of the controllable switch 101. The source of the PMOS transistor Q11 is connected to one end of the diode D1, one end of the capacitor C37, and one end of the resistor R98. The other ends of the diode D1, the capacitor C37, and the resistor R98 are all connected to the gate of the PMOS transistor Q11. The gate of the PMOS transistor Q11 is connected to one end of the resistor R74. The other end of resistor R74 is connected to the anode of diode D24 and the collector of transistor Q15. The cathode of diode D24 is connected to one end of button SW. The other end of button SW is connected to one end of resistor R75. The other end of resistor R75 is connected to the base of transistor Q15 and one end of resistor R40. The other end of resistor R40 is grounded. The emitter of transistor Q15 is grounded. The base of transistor Q15 is connected to one end of resistor R80. The other end of resistor R80 is used to connect to the main controller to receive the CLOCK self-locking signal generated by the main controller. Figure 1 As shown, after pressing button SW, the lithium battery VBatt, resistors R98 and R74, diode D24, button SW, resistors R75 and R40 form a circuit. The power supply voltage of the lithium battery VBatt reaches the base of transistor Q15 after passing through resistor R74, diode D24, button SW, and resistor R75. The base of transistor Q15 is at a high level, and transistor Q15 conducts, pulling down the gate voltage of PMOS transistor Q11. PMOS transistor Q11 then conducts, and the power supply voltage of the lithium battery VBatt forms a latch-up voltage through PMOS transistor Q11. Vclock, the self-locking voltage Vclock, is converted into the working voltage B+_MCU by the first voltage conversion circuit 103 to power the MCU. When the MCU starts, it generates a self-locking signal CLOCK, which keeps the base of transistor Q15 at a high level and keeps transistor Q15 in the conducting state. At this time, button SW rebounds, and the path of lithium battery VBatt, resistor R98, resistor R74, diode D24, button SW, resistor R75 and resistor R40 is broken. Transistor Q15 is kept in the open state by using the self-locking signal CLOCK, thus forming a self-lock.

[0022] In this embodiment, the specific structure of the second voltage conversion circuit 104 is as follows: Figure 3As shown, it contains a chip of model EG1192L, which is its peripheral circuit. The specific structure is as follows. Figure 3 As shown, this is existing technology and will not be elaborated here. The self-locking voltage Vclock is converted by the EG1192L chip to form a power supply voltage of +15V, which provides power to other components on the main control board.

[0023] like Figure 1 and Figure 3 As shown, in this embodiment, the overprotection voltage Over Protect is converted by a third voltage conversion circuit, which contains a resistor R23. The power supply voltage +15V is connected to one end of resistor R23, and the other end of resistor R23 is connected to one end of resistor R26. The other end of resistor R26 is grounded, and the end of resistor R23 connected to resistor R26 forms the overprotection voltage Over Protect.

[0024] like Figure 1 As shown, the detection circuit 102 includes diode D10. The cathode of diode D24 is connected to the cathode of diode D10. The anode of diode D10 receives the overprotection voltage Over Protect. The anode of diode D10 is connected to one end of resistor R46 and one end of capacitor C63. The other end of capacitor C63 is grounded. The other end of resistor R46 forms the key detection signal SW_CHECK. During normal circuit operation, key SW is open, and transistor Q15 remains open using the latching signal CLOCK. The key detection signal SW_CHECK represents the overprotection voltage Over Protect. When key SW malfunctions and fails to rebound, a path is formed between the overprotection voltage Over Protect, diode D10, resistor R75, resistor R40, and GDN, causing the overprotection voltage Over Protect to decrease. This, in turn, causes the key detection signal SW_CHECK to decrease, allowing the MCU to detect the key's failure to rebound.

Claims

1. A power supply circuit for a scooter main control board, comprising a controllable switch, a first voltage conversion circuit, and a second voltage conversion circuit; the control terminal of the controllable switch is adapted to be connected to a button SW; the input terminal of the controllable switch is connected to the lithium battery VBatt of the scooter, and the output terminal is adapted to be connected to the first voltage conversion circuit and the second voltage conversion circuit; the first voltage conversion circuit is adapted to be connected to the main controller of the scooter main control board, and the main controller is adapted to be connected to the control terminal of the controllable switch; when the button SW is pressed, the controllable switch enters the conducting state, converting the power supply voltage of the lithium battery VBatt into a self-locking voltage Vclock; the self-locking voltage Vclock forms the operating voltage B+_MCU of the main controller through the first conversion circuit; the main controller is powered on and starts, generating a self-locking signal CLOCK to control the controllable switch to be in the conducting state; the self-locking voltage Vclock forms a power supply voltage +15V through the second conversion circuit; characterized in that… The button SW is connected to a detection circuit, which generates a button detection signal SW_CHECK and sends it to the main controller to detect whether the button SW is working properly.

2. The power supply circuit of the scooter main control board as described in claim 1, characterized in that, The controllable switch is a PMOS transistor Q11. The source of the PMOS transistor Q11 is the input terminal of the controllable switch, the drain of the PMOS transistor Q11 is the output terminal of the controllable switch, and the gate of the PMOS transistor Q11 is the control terminal of the controllable switch.

3. The power supply circuit of the scooter main control board as described in claim 2, characterized in that, The source of the PMOS transistor Q11 is connected to one end of diode D1, one end of capacitor C37, and one end of resistor R98. The other ends of diode D1, capacitor C37, and resistor R98 are all connected to the gate of PMOS transistor Q11. The gate of PMOS transistor Q11 is connected to one end of resistor R74. The other end of resistor R74 is connected to the anode of diode D24 and the collector of transistor Q15. The cathode of diode D24 is connected to one end of button SW. The other end of button SW is connected to one end of resistor R75. The other end of resistor R75 is connected to the base of transistor Q15 and one end of resistor R40. The other end of resistor R40 is grounded. The emitter of transistor Q15 is grounded.

4. The power supply circuit of the scooter main control board as described in claim 3, characterized in that, The base of the transistor Q15 is connected to one end of the resistor R80, and the other end of the resistor R80 is used to connect to the main controller to receive the self-locking signal CLOCK generated by the main controller.

5. The power supply circuit of the scooter main control board as described in claim 4, characterized in that, The detection circuit includes a diode D10. The cathode of the diode D24 is connected to the cathode of the diode D10. The anode of the diode D10 is connected to the overprotection voltage Over Protect. The anode of the diode D10 is connected to one end of the resistor R46 and one end of the capacitor C63. The other end of the capacitor C63 is grounded. The other end of the resistor R46 forms the key detection signal SW_CHECK.

6. The power supply circuit of the scooter main control board as described in claim 5, characterized in that, The +15V power supply voltage is connected to one end of resistor R23, the other end of resistor R23 is connected to one end of resistor R26, the other end of resistor R26 is grounded, and the end of resistor R23 connected to resistor R26 forms the overprotection voltage.

7. The power supply circuit of the scooter main control board as described in claim 1, characterized in that, The first voltage conversion circuit includes a resistor R137. One end of the resistor R137 is connected to the self-locking voltage Vclock, and the other end of the resistor R137 is connected to one end of the resistor R16 and one end of the capacitor C5. The other ends of the resistor R16 and the capacitor C5 are both grounded. The end of the resistor R137 connected to the resistor R16 forms the operating voltage B+_MCU.

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