HUD stepping motor drive circuit

Abstract

The utility model relates to an HUD stepping motor drive circuit, which comprises a main chip and a stepping motor, pins 1, 21, 24 and 26 of the main chip are connected with the input end of the stepping motor, a pin 2 of the main chip is connected with an MENN signal end to control the starting and stopping of the stepping motor, and a pin 16 of the main chip is connected with an MSTEP signal end to carry out microstep control on the stepping motor. The output power is adjustable, the serial port supports 256 microsteps, the overall adaptability is better, the cost is lower, and a power-saving mode can be configured when the motor stops rotating.

Description

Technical Field

[0001] The utility model relates to the technical field of head-up display systems, in particular to a HUD stepping motor driving circuit. Background Art

[0002] HUD, short for Head-Up Display, also known as a head-up display system, is commonly used in automobiles. Its function is to project important driving information such as speed and navigation onto the windshield in front of the driver, allowing the driver to see these information without looking down or turning their head. Existing HUD stepper motor drive circuits have unadjustable output power, and their power consumption and cost are too high. Summary of the Invention

[0003] The utility model provides a HUD stepper motor driving circuit, aiming to solve the problem that the output power of the existing HUD stepper motor driving circuit cannot be adjusted.

[0004] The utility model provides a HUD stepper motor drive circuit, which includes a main chip and a stepper motor. Pins 1, 21, 24, and 26 of the main chip are connected to the input end of the stepper motor, pin 2 of the main chip is connected to the M_ENN signal end to control the start and stop of the stepper motor, and pin 16 of the main chip is connected to the M_STEP signal end to perform micro-step control on the stepper motor.

[0005] As a further improvement of the present invention, when the state of pin 2 of the main chip is high level, the motor rotates, and when the state of pin 2 of the main chip is low level, the motor stops.

[0006] As a further improvement of the present invention, pin 4 of the main chip is connected to one end of the capacitor C512, and the other end of the capacitor C512 is connected to pin 5 of the main chip.

[0007] As a further improvement of the present invention, pin 7 of the main chip is connected to one end of the capacitor C510, the other end of the capacitor C510 is connected to one end of the magnetic bead FB401, the other end of the magnetic bead FB401 is connected to a 12V voltage, pins 22 and 28 of the main chip are both connected to one end of the magnetic bead FB401, one end of the capacitor C403, one end of the capacitor C404 and one end of the capacitor C405 are all connected to one end of the magnetic bead FB401, and the other end of the capacitor C403, the other end of the capacitor C404 and the other end of the capacitor C405 are all grounded.

[0008] As a further improvement of the present invention, pin 22 of the main chip is connected to one end of resistor R401, pin 27 of the main chip is connected to one end of resistor R402, and the other end of resistor R401 and the other end of resistor 402 are both grounded.

[0009] As a further improvement of the present invention, pin 8 of the main chip is connected to one end of the capacitor C402, and the other end of the capacitor C402 is connected to pin 29 of the main chip.

[0010] As a further improvement of the present invention, pin 9 of the main chip is connected to one end of the resistor R409, the other end of the resistor R409 is connected to the MCU_VDD signal end, pin 12 of the main chip is connected to the M_FGO signal end, pin 12 of the main chip is connected to one end of the resistor R405, the other end of the resistor R405 is connected to the other end of the resistor R409, pin 11 of the main chip is connected to the M_FAULT signal end, pin 11 of the main chip is connected to one end of the resistor R407, the other end of the resistor R407 is connected to the other end of the resistor R409, pin 10 of the main chip is connected to one end of the resistor R408, and the other end of the resistor R408 is connected to the other end of the resistor R409.

[0011] As a further improvement of the present invention, pin 17 of the main chip is connected to one end of the resistor R406, the other end of the resistor R406 is connected to the MCU_VDD signal end, one end of the capacitor C407 is connected to one end of the resistor R406, one end of the resistor R403 is connected to one end of the R406, and the other end of the capacitor C407 and the other end of the resistor R403 are both grounded.

[0012] As a further improvement of the present invention, pin 14 of the main chip is connected to the M_PDN signal terminal, pin 19 of the main chip is connected to one end of the resistor R404, and the other end of the resistor R404 is connected to the M_DIR signal terminal.

[0013] As a further improvement of the present invention, the model of the main chip is MS35774A.

[0014] The beneficial effects of the utility model are: adjustable output power, serial port support for 256 microsteps, better overall adaptability, lower cost, and a configurable power-saving mode when the motor stops rotating. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a specific connection diagram of the circuit of the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1As shown, the utility model provides a HUD stepper motor drive circuit, including a main chip and a stepper motor. Pins 1, 21, 24, and 26 of the main chip are connected to the input end of the stepper motor, pin 2 of the main chip is connected to the M_ENN signal end to control the start and stop of the stepper motor, and pin 16 of the main chip is connected to the M_STEP signal end to perform micro-step control on the stepper motor.

[0018] As an embodiment of the present invention, when the state of pin 2 of the main chip is high level, the motor rotates, and when the state of pin 2 of the main chip is low level, the motor stops.

[0019] As another embodiment of the present invention, pin 4 of the main chip is connected to one end of the capacitor C512, and the other end of the capacitor C512 is connected to pin 5 of the main chip.

[0020] As another embodiment of the present invention, pin 7 of the main chip is connected to one end of capacitor C510, the other end of capacitor C510 is connected to one end of magnetic bead FB401, the other end of magnetic bead FB401 is connected to a 12V voltage, pins 22 and 28 of the main chip are connected to one end of magnetic bead FB401, one end of capacitor C403, one end of capacitor C404, and one end of capacitor C405 are all connected to one end of magnetic bead FB401, and the other ends of capacitors C403, C404, and C405 are all grounded. The function of magnetic bead FB401 is to isolate high frequencies, prevent signal crosstalk, and provide EMI conduction isolation.

[0021] As another embodiment of the present invention, pin 22 of the main chip is connected to one end of resistor R401, pin 27 of the main chip is connected to one end of resistor R402, and the other end of resistor R401 and the other end of resistor 402 are both grounded.

[0022] As another embodiment of the present invention, pin 8 of the main chip is connected to one end of the capacitor C402, and the other end of the capacitor C402 is connected to pin 29 of the main chip.

[0023] As another embodiment of the present utility model, pin 9 of the main chip is connected to one end of the resistor R409, the other end of the resistor R409 is connected to the MCU_VDD signal end, pin 12 of the main chip is connected to the M_FGO signal end, pin 12 of the main chip is connected to one end of the resistor R405, the other end of the resistor R405 is connected to the other end of the resistor R409, pin 11 of the main chip is connected to the M_FAULT signal end, pin 11 of the main chip is connected to one end of the resistor R407, the other end of the resistor R407 is connected to the other end of the resistor R409, pin 10 of the main chip is connected to one end of the resistor R408, and the other end of the resistor R408 is connected to the other end of the resistor R409.

[0024] As another embodiment of the present invention, pin 17 of the main chip is connected to one end of the resistor R406, the other end of the resistor R406 is connected to the MCU_VDD signal end, one end of the capacitor C407 is connected to one end of the resistor R406, one end of the resistor R403 is connected to one end of the R406, and the other end of the capacitor C407 and the other end of the resistor R403 are both grounded.

[0025] As another embodiment of the present invention, pin 14 of the main chip is connected to the M_PDN signal terminal, pin 19 of the main chip is connected to one end of the resistor R404, and the other end of the resistor R404 is connected to the M_DIR signal terminal.

[0026] As another embodiment of the present invention, the model of the main chip is MS35774A.

[0027] The utility model provides a HUD stepper motor drive circuit, which adopts Ruimeng's latest low-cost chip MS35774A design, optimizes the circuit structure and main power ripple, low-noise stepper motor drive, eliminates differential resistance parameters, and uses common materials for greater uniformity.

[0028] The circuit works as follows:

[0029] Motor start: When the 2-pin state of the main chip is high, the motor rotates, and when the state is low, the motor stops;

[0030] Power pump: capacitor C512 bridges pins 4 and 5 of the main chip, and capacitor C510 connects pin 6 of the main chip to boost voltage;

[0031] Internal LDO filter of the chip: capacitor C402 is connected to the 8-pin bypass of the main chip.

[0032] The 1 / 2, 1 / 4, 1 / 8, and 1 / 16 subdivision adjustment of the stepper motor of the main chip is adjusted by connecting the resistor R408 and the resistor R409 pins to the 9 and 10 pins of the main chip to adjust the speed subdivision ratio of the stepper motor inside the chip. The speed subdivision ratio of the stepper motor is shown in the following table, where the 9 pin of the main chip is MS1 and the 10 pin of the main chip is MS2.

[0033] MS2 MS1 Stepper motor speed subdivision ratio 0 0 1 / 8 0 1 1 / 2 1 0 1 / 4 1 1 1 / 16

[0034] Fault output: connected to pin 11 of the main chip through an external pull-up resistor R407;

[0035] Motor current output: connected to pin 12 of the main chip through external resistor R405;

[0036] Single-wire serial port control: receive instructions and send status through pin 14 of the main chip;

[0037] VIO level voltage: connected to the control chip power supply through pin 15 of the main chip to achieve level matching;

[0038] Micro-step control: fine-tune the PPS of the motor through the 16 pins of the main chip;

[0039] Motor output port: pins 1, 21, 24, and 26 of the main chip are output to the motor;

[0040] Motor drive current setting: After voltage division by resistors R403 and R406, input to pin 17 of the main chip;

[0041] Motor forward and reverse control: The motor forward and reverse rotation is controlled by the high and low pin 19 of the main chip;

[0042] Motor coil current sensing: Connect to pins 23 and 27 of the main chip through resistors R401 and R402.

[0043] Compared with the existing technology, this circuit has the following advantages: the output power is adjustable, the peak current of the motor is determined by the ground resistors R401 and R402 between pins 23 and 27 of the main chip and the input voltage of pin 17 of the control chip, and the peak current MAX=2A; the microstepping pins 2, 4, 8, and 16 are externally adjusted, the serial port supports 256 microsteps, and a power saving mode can be configured when the motor stops rotating.

[0044] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A HUD stepper motor drive circuit, characterized in that: It includes a main chip and a stepper motor. Pins 1, 21, 24, and 26 of the main chip are connected to the input end of the stepper motor. Pin 2 of the main chip is connected to the M_ENN signal end to control the start and stop of the stepper motor. Pin 16 of the main chip is connected to the M_STEP signal end to perform micro-step control on the stepper motor.

2. The HUD stepper motor driving circuit according to claim 1, characterized in that: When the 2-pin state of the main chip is high, the motor is rotating; when the 2-pin state of the main chip is low, the motor is stopped.

3. The HUD stepper motor driving circuit according to claim 1, characterized in that: Pin 4 of the main chip is connected to one end of the capacitor C512, and the other end of the capacitor C512 is connected to pin 5 of the main chip.

4. The HUD stepper motor driving circuit according to claim 1, characterized in that: Pin 7 of the main chip is connected to one end of capacitor C510, the other end of capacitor C510 is connected to one end of magnetic bead FB401, the other end of magnetic bead FB401 is connected to 12V voltage, pins 22 and 28 of the main chip are both connected to one end of magnetic bead FB401, one end of capacitor C403, one end of capacitor C404 and one end of capacitor C405 are all connected to one end of magnetic bead FB401, the other end of capacitor C403, the other end of capacitor C404 and the other end of capacitor C405 are all grounded.

5. The HUD stepper motor driving circuit according to claim 1, characterized in that: Pin 22 of the main chip is connected to one end of the resistor R401 , pin 27 of the main chip is connected to one end of the resistor R402 , and the other ends of the resistors R401 and R402 are both grounded.

6. The HUD stepper motor driving circuit according to claim 1, characterized in that: Pin 8 of the main chip is connected to one end of capacitor C402, and the other end of capacitor C402 is connected to pin 29 of the main chip.

7. The HUD stepper motor driving circuit according to claim 1, characterized in that: Pin 9 of the main chip is connected to one end of the resistor R409, and the other end of the resistor R409 is connected to the MCU_VDD signal end. Pin 12 of the main chip is connected to the M_FGO signal end. Pin 12 of the main chip is connected to one end of the resistor R405, and the other end of the resistor R405 is connected to the other end of the resistor R409. Pin 11 of the main chip is connected to the M_FAULT signal end. Pin 11 of the main chip is connected to one end of the resistor R407, and the other end of the resistor R407 is connected to the other end of the resistor R409. Pin 10 of the main chip is connected to one end of the resistor R408, and the other end of the resistor R408 is connected to the other end of the resistor R409.

8. The HUD stepper motor driving circuit according to claim 1, characterized in that: Pin 17 of the main chip is connected to one end of the resistor R406, the other end of the resistor R406 is connected to the MCU_VDD signal end, one end of the capacitor C407 is connected to one end of the resistor R406, one end of the resistor R403 is connected to one end of the R406, and the other end of the capacitor C407 and the other end of the resistor R403 are both grounded.

9. The HUD stepper motor driving circuit according to claim 1, characterized in that: Pin 14 of the main chip is connected to the M_PDN signal terminal, pin 19 of the main chip is connected to one end of the resistor R404, and the other end of the resistor R404 is connected to the M_DIR signal terminal.

10. The HUD stepper motor driving circuit according to any one of claims 1 to 9, characterized in that: The main chip model is MS35774A.

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