| 摘要 |
PURPOSE:To normally perform a flywheel function even if a switching frequency increases by turning ON flywheel elements of positive and negative directions alternately between one AC cycle and continuously during a half cycle. CONSTITUTION:A switching transistor TR1 is switched by a frequency higher than an AC power source frequency. In the positive half cycle of an AC power source (e), a transistor TR2 is turned ON, and when a transistor TR1 is turned OFF, an induced current flowed to a motor M is circulated through the transistor TR2 and a diode D7. In the negative half cycle of the power source (e), a transistor TR3 is turned ON, and when the transistor TR1 is turned OFF, the induced current flowed to the motor M is circulated through the transistor TR3 and a diode D8. |
