| 摘要 |
A current detecting switching element is connected to an output circuit having switching elements making a bridge connection, current flowing to the switching element is detected by a current detection circuit in response to a torque command signal, a PWM signal generation circuit generates a PWM signal according to the output, a synthesizing circuit synthesizes the output of a power switch circuit for determining an energized phase to a motor coil and the output signal of the PWM signal generation circuit, and PWM operation of a first state and a second state is repeated to control current supply to the motor coil. The first state enables current supply to the motor coil when the switching element on one side is conducting, the switching element on the other side is nonconducting, and the current detecting switching element is conducting. The second state brings the current detecting switching element out of conduction and brings into conduction all the switching elements making a bridge connection in an energizing polarity switch circuit.
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