A voltage-controlled current source stepper motor driver

Abstract

The invention discloses a voltage-controlled current source stepping motor driving device, which includes an H-bridge control unit used to drive the stepping motor, and four power devices of the H-bridge control unit respectively pass through a first switch circuit, a second switch circuit, a second switch circuit, and a second switch circuit. The three switch circuits and the fourth switch circuit control the on-off of the power device; the driving device also includes a voltage-controlled current source circuit for controlling the winding current of the stepping motor, and the voltage-controlled current source circuit includes an operational amplifier (N2) and a Darlington tube (Q9), through the switching circuit to drive the MOS tube of the H bridge, so that the H bridge control unit is turned on in sequence, and realize the control of the rotation direction of the stepper motor; through the voltage control current source circuit, the control voltage flows through the stepper motor winding Current control, so as to achieve the purpose of controlling the speed of the stepper motor. The Darlington tube works in the linear region, which curbs the voltage overshoot phenomenon of the stepper motor winding and the straight-through phenomenon of the H bridge drive, and does not need to increase the timing control of the dead zone and Transient overvoltage absorbing circuit, simple structure and high reliability.

Description

technical field [0001] The invention relates to the technical field of motor drive, in particular to a voltage-controlled current source stepper motor drive device. Background technique [0002] As is known, the stepper motor driver is an actuator that converts electrical pulses into angular displacements. When the stepper motor driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle in a set direction. The rotation of the motor runs at a fixed angle step by step, and the angular displacement can be controlled by controlling the number of pulses, so as to achieve the purpose of accurate positioning; at the same time, the speed and acceleration of the motor rotation can be controlled by controlling the pulse frequency to achieve speed regulation. Purpose. At present, it is a common way to drive a DC motor in the form of an H-bridge circuit. "H-Bridge Control System" (Patent No.: ZL200620014994.3) discloses an H-bridge control system for motor spee...

AI Technical Summary

Problems solved by technology

At present, it is a common way to drive a DC motor in the form of an H-bridge circuit. "H-Bridge Control System" (Patent No.: ZL200620014994.3) discloses an H-bridge control system for motor speed and forward and reverse rotation. The system uses the MCU to generate PWM signals to control the H-bridge circuit. Due to the timing of the PWM signals, the H-bridge may appear unilaterally through when it is working, and the power devices also have overshoots. Therefore, it is necessary to increase the timing control of the dead zone and The transient voltage absorption circuit is used to protect the power devices, which will inevitably increase the complexity of the circuit and affect the reliability of the system

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