| 摘要 |
PURPOSE:To eliminate the discharge of a regenerative capacitor at every stopping time by connecting the capacitor with the DC power side of a switch connected in series between a DC power source and an inverter and a regenerative brake resistor with the inverter side. CONSTITUTION:In a circuit in which a switch SW2 having relay contacts (a)- (c) is connected in series between a DC power source E1 and an inverter, a regenerative condenser C2 is connected in parallel with the DC power source E1 side of the switch SW2, and a regenerative brake resistor R3 connected in series with a switching element Q13 is connected in parallel with the inverter side. Further, a regenerative diode D1 is connected in parallel between the DC power source side contact (c) of the switch SW2 and the inverter side contact (a). Thus, since the charge of the capacitor C2 is not discharged at the regenerative braking time, energy-saving is intended to increase the life of the switch SW2. |
