A n-mos and p-mos permanent magnet synchronous motor drive circuit with hardware protection

Abstract

The invention discloses a permanent magnet synchronous motor drive circuit composed of N-MOS and P-MOS with hardware protection. The technical solution adopted in the invention is a new type of permanent magnet synchronous motor drive circuit to control a three-phase permanent magnet synchronous motor Work, use discrete components to drive N-MOSFET, P-MOSFET, including MCU operation control module (1), high-speed optocoupler isolation module (2), reverse output module (3), N-MOSFET control module (4), N -MOSFET dead zone generating module (5), P-MOSFET control module (6), P-MOSFET dead zone generating module (7). The middle and low-end MCU outputs one PWM wave, which can be converted into two complementary symmetrical PWM waves with dead zones after passing through the drive circuit, and drives the power element to control the permanent magnet synchronous operation. This driving method does not use a power driver chip, reduces circuit costs, saves IO resources of low-end MCUs, eases the MCU's computing burden, and generates dead time to prevent the upper and lower bridge arms from simultaneously conducting and breaking down the circuit.

Description

technical field [0001] The present invention relates to a permanent magnet synchronous motor control circuit, especially the driving control using N-type channel MOS tube and P-type channel MOS tube. Two channels of complementary symmetrical PWM waves with dead zone, the dead time generated by the hardware circuit can effectively prevent the power tubes of the upper and lower bridge arms from being turned on at the same time. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) has the advantages of simple structure, small size, light weight, high power density and large output torque, and is widely used in robots, CNC machine tools, smart homes, new energy vehicles and other fields. With the continuous improvement and improvement of the performance of permanent magnet materials and power electronic components, the demand for various types of permanent magnet synchronous motors is also increasing. In the commonly used permanent magnet synchronous motor co...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems caused by using a power drive chip plus two power tubes in a traditional three-phase permanent magnet synchronous motor driver. This drive scheme requires the controller to output six complementary symmetrical PWM waves to control the power drive chip to drive up and down. The switching action of the bridge arm MOS tube

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