| 摘要 |
PURPOSE:To reduce the capacity of a resistor and to prevent an inverter from burning out or deteriorating in the characteristics by controlling the time constant of a charging/discharging circuit of a regenerative power discharging unit for discharging regenerative power in coincidence with that of a resistor for discharging the regenerative power at the temperature rising and falling time. CONSTITUTION:An inverter power reactor 4 is composed of a 3-phase full-wave rectifier 5 and a smoothing condenser 3. A regenerative power discharging unit 6 is composed of a discharging resistor 22, a transistor 23 and a transistor driving controller 7. In the controller 7, the time constant at the temperature rising and falling time of the resistor 22 is controlled in coincidence with that of the capacitor at the charging and discharging time. |
