Patent ID: 7839021

Claim:
A multiplexed direct current regulation output circuit comprising a feedback circuit, a sampling circuit, a power control chip, a first output, a second output, a first half wave rectifier circuit, a second half wave rectifier circuit, a first filter circuit, a second filter circuit, a transformer, and a balance control circuit, the transformer configured to provide low voltages to the first output via the first half wave rectifier circuit and the first filter circuit in series, and provide high voltages to the second output via the second half wave rectifier circuit and the second filter circuit in series, the balance control circuit configured to control a voltage at the second output, the sampling circuit configured to sample voltages of the first and second outputs and provide the sampling voltages to the feedback circuit, the feedback circuit configured to selectively provide the sampling voltages to the power control chip, and the power control chip configured to adjust a pulse duty ratio of the transformer according to the received sampling voltages and thereby adjust the voltages at the first and second outputs; wherein the balance control circuit comprises a transistor, a clamping diode, a first bias resistor, a second bias resistor, and a balance resistor, the first bias resistor, the clamping diode, and the second bias resistor being connected in series between the first output and the second output, a node between the cathode of the clamping diode and the first bias resistor being connected to the base of the transistor, the emitter of the transistor being connected to the second output, and the collector of the transistor being connected to the first output via the balance resistor.