REVERSE CONTROLLER OF ELECTRIC AUTOMOBILE

摘要

PURPOSE:To control the speed with high reliability by varying an input voltage to a chopper by switching between forward and reverse. CONSTITUTION:A control switch 22 is closed at forward time. When an accelerator lever is operated to move a potentiometer 24 to a power source side, a voltage in response to the accelerator opening is input to an operational amplifier 27. A PWM modulator 39 applies a pulse signal in response to the output voltage of the amplifier 27 to a power transistor 19. The switch 22 is opened at the reverse time. Thus, a control transistor 29 is conducted to reduce the maximum input voltage of the amplifier 27. Thus, the prescribed maximum conduction rate can be obtained at both forward and reverse times.