Bias circuit for a switching power supply

Details Bias circuit for a switching power supply Bias circuit for a switching power supply

2008-11-06

2010-10-26

Nguyen, Hai L (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

Reexamination Certificate

active

07821323

ABSTRACT:
A bias circuit for a switching power supply includes a rectifier that is connected to an AC power source and outputs a full wave rectified voltage Vs; a voltage divider, a diode, a first transistor, and a second transistor connected in parallel between Vs and ground; a capacitor connected between a first terminal of the second transistor and ground; and a node between the capacitor and the first terminal of the second transistor providing an output bias voltage Vcc from the bias circuit. A voltage from the voltage divider is provided to a gate of the first transistor, and the diode and a first terminal of the first transistor are connected to a gate of the second transistor.

REFERENCES:
patent: 6404268 (2002-06-01), Hung et al.
patent: 7078937 (2006-07-01), Baude et al.
patent: 7256638 (2007-08-01), Vice

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