Importance

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Abstract

This invention provides a driving circuit for a switched reluctance motor(SRM) comprising a current sensing unit which senses current amount flowing into a driving circuit of the SRM and outputs a signal representing current amount flowing in the driving circuit, a comparing unit which compares a reference current amount with current amount flowing in the driving circuit in response to the output signal from the current sensing means, and outputs a stop signal in case the current amount flowing in the driving circuit of the SRM exceeds the reference current amount, and a signal selecting unit which receives output signal from the comparing means, a Pulse Width Modulated(PWM) signal and a rotor position signal, and outputs a gate controlling signal for turning off the switching element during an input of the stop signal from the comparing means. The protection of the driving circuit against the excess current according to the present invention improves reliability of the SRM, as well as eliminates the ripple component in the driving current(torque ripple) generated at the time of an initial start-up of each phase, which reduces loud noise of the motor.

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First Claim