| 摘要 |
PURPOSE:To improve the power factor of an input by inserting a series circuit of a reactor and a diode into a DC intermediate circuit of a rectifier and an inverter, and providing a capacitor in parallel therewith. CONSTITUTION:An AC power source 1 is converted through a rectifier 2 of diodes and a smoothing condenser 3 into a DC voltage, which is converted by an inverter 4 into an AC, and supplied to a load 5. A reactor 9 for improving the power factor of the input is inserted between the power source 1 and the rectifier 2, a diode 7 is provided, and a capacitor 8 is connected in parallel therewith. Thus, a current flowed to the reactor 9 for improving the power factor is charged reversely in the capacitor 8 in a path of the reactor 9, the diode 7, the condenser 8 and the reactor 9. The reverse redischarge of the condenser 8 is blocked by the diode 7 to remain charged to increase the period that the current of the same direction as the voltage is flowed. |
