The invention relates to a controllable
power output circuit for a vehicle and a control method thereof. The controllable
power output circuit comprises a power supply VCC connected with an
overcurrent protection circuit, and the
overcurrent protection circuit is connected with the emitter and the base of an
audion Q1 in parallel; the base of Q1 is connected with the collector of an
audion Q2, the base of Q2 is connected with a
resistor R5, a
resistor R6 and a
resistor R10, R10 is connected with a reference
voltage terminal VDD, R5 is connected with the emitter of Q2, the emitter of Q2 is further connected with the
electrode A of a
diode D1, the
electrode K of D1 is connected with the
electrode K of a
diode D5 and the electrode A of a
diode D6 through a resistor R15, and the electrode K of D6 is connected with an output
voltage control terminal VIC-Con; the collector of Q1 is connected with the collector of an
audion Q3; the base of Q3 is connected with a resistor R7 and a resistor R8, R8 is connected with a power supply output terminal Vout and a resistor R16 at the same time, and R6, the electrode A of D5 and R16 are grounded; R7 is connected with the emitter of Q3, the emitter of Q3 is further connected with the electrode A of a diode D7, and the electrode K of D7 is connected with the electrode K of D1. The controllable
power output circuit can control
voltage output and is low in
power consumption.