Electric Motor Drive Isolation Circuit

摘要

An isolation circuit is coupled between motor driver half bridge circuits and an electric motor. A motor controller circuit supplies motor drive signals to the motor driver half bridge circuits. The isolation circuit includes transistors coupled in series with the motor windings. Low to medium power diodes are coupled between a reference voltage source and control terminals of the transistors.

主权项

1. A motor driver circuit, comprising:
an isolation circuit, comprising:
a plurality of transistors, each one of the plurality of transistors having a respective first current passing terminal, a respective second current passing terminal, and a respective control terminal, wherein each respective first current passing is configured to couple to a respective one of a plurality of half bridge circuits, and wherein each respective second current passing terminal is configured to couple to a respective winding of an electric motor; anda plurality of diodes, each one of the plurality of diodes having a respective anode end and a respective cathode end, wherein each respective cathode end or each respective anode end is coupled to a respective control terminal of a respective one of the plurality of transistors, and wherein the other one of each respective anode end or each respective cathode end is coupled to a reference voltage source.