Power factor correction controlled boost converter with an impro

Details Power factor correction controlled boost converter with an impro Power factor correction controlled boost converter with an impro

1995-11-30

1998-05-26

Wong, Peter S.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

363 89, 363124, G05F 110

Patent

active

057571660

ABSTRACT:
An electronic power supply circuit (12) having a rectifier circuit (18) adapted to receive a source of alternating current (10), a power factor correction driven boost converter (20), and a bulk capacitance (22). The boost converter (20) includes a boost transformer (24) having a primary winding (32) and a secondary winding (34), a boost switch (26), a boost diode (28), a zener diode (46), and a power factor correction control circuit (30) having a zero current detect input (58). The presence of the zener diode (46) effectively adds a fixed offset to the voltage provided to the zero current detect input (58), thereby allowing the boost converter (20) to operate under high input line voltage conditions. The zener diode (46) may be oriented in various ways, and may be incorporated into an integrated circuit containing other elements of the power factor correction control circuit (30). One particular embodiment of the power supply circuit (12) is for use in an electronic ballast (70) for fluorescent lamps.

REFERENCES:
patent: 4163278 (1979-07-01), Onoue et al.
patent: 5019952 (1991-05-01), Smolenski
patent: 5144204 (1992-09-01), Nerone et al.

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