Patent ID: 9106137
Filing Date: 2015-08-11
Classification: H02M

Abstract:
1. A direct current (DC) voltage generating apparatus for generating stable DC voltages comprising: a voltage conversion circuit adapted to receive an alternating current (AC) voltage, and convert the AC voltage to a first DC voltage; a voltage control circuit adapted to receive the first DC voltage, and convert the first DC voltage to a second DC voltage and a control signal; and a voltage regulating circuit adapted to receive the control signal, and regulate the second DC voltage to a stable second DC voltage at the voltage control circuit according to the control signal, wherein the voltage control circuit comprises a first transistor and a variable resistor; the variable resistor comprises an adjusting terminal; the voltage regulating circuit comprises a second transistor and a third transistor; the adjusting terminal of the variable resistor is slid to a position wherein the first transistor, the second transistor, and the third transistor turn on in order and an emitter of the first transistor outputs the stable second DC voltage.