Importance

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Abstract

According to an embodiment of the present invention, a control circuit of a motor drive device activates a first timer according to the rotational position of a motor, controls, on the basis of the time counted by the first timer, the on-timing of positive-side switching elements that constitute an inverter circuit, and energizes the motor. The control circuit also activates a second timer according to the on-timing, controls the off-timing of the positive-side switching elements, on the basis of the time counted by the second timer, sets negative-side switching elements of two opposing arms to be in an on-state to cause a reflux current to flow, and then changes an energization direction to the motor. When the rotational position is set to a position for activating the first timer before the on-timing, turning on of the positive-side switching elements and activation of the second timer, which are scheduled to be performed at the on-timing, are carried out.

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First Claim