| 摘要 |
PURPOSE:To obtain a power system circuit having simple circuitry by constituting an H bridge such that a current is fed through a single phase induction motor in one direction by transistors applied, respectively, with a pulse signal and a PWM signal and a current is fed in reverse direction for next different active state. CONSTITUTION:A comparator 9 is provided with an inversion unit 71 on the input side thereof and produces a pulse waveform having an active state generating time shifted by a half period of the sine wave from that of a comparator 10. Since a PWM signal is applied to the gate of a Tr5 when the gate of a power MOSFET(Tr)2 is turned ON, current flows through a capacitor motor (CM)6 from the left to the right. When the Tr4 is turned ON, current flows through the motor from the right to the left. Since PWM signals are fed to the gate terminals of the Tr3 and Tr5, sine wave current flows through the CM6 and thereby a smooth motor circuit is obtained. |
