Nidec Servo Corporation

Masahiro Tsuchiya

Masatomo Ishikawa

A motor drive circuit includes an upper switch, a lower switch connected in series with the upper switch and drives a brushless DC motor, a gate drive circuit that drives the lower switch and a brake circuit that uses an inductive voltage generated by the brushless DC motor to apply a voltage to a gate terminal of the lower switch via the gate drive circuit and turns on the lower switch. The gate drive circuit includes a push element that applies a predetermined source voltage to the gate terminal when on, a pull element that pulls out charge from the gate terminal when on, and a rectifier between the push element and the gate terminal to rectify current in a direction from the push element toward the gate terminal.

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Kiryu, Japan

Masahiro Tsuchiya