| 摘要 |
PURPOSE:To reduce the loss of electric power, by driving a driving circuit of the inverter control part with an auxiliary winding provided at a choke of the inverter in the steady operation mode of the inverter and with a DC input power supply in the start and stop modes of the inverter. CONSTITUTION:The voltage that charged a capacitor C2 is applied to an inverter control part 4 by the voltage of a DC input power supply 1 via TRQ3 and TRQ4 and resistances R4 and R5 when an inverter 2 is started. The energy which is stored at a choke L1 when a TRQ1 conducts is partially fed back to the power supply through a feedback winding N3 via a diode D1 when the TRQ1 conducts, and at the same time a capacitor C1 is charged via a diode D2 and a resistance R1 by the electromotive force induced at an auxiliary winding N2 when the inverter 2 has a steady operation. When the charged voltage rises up, a TRQ2 conducts with flowing of the base current. Thus the TRQ3 becomes nonconductive. As the resistance value of a resistance R2 is sufficiently large compared with that of the R4, the flowing current is reduced to minimize the loss of the electric power. |
