Output voltage stabilizing circuit of a power factor correction

Details Output voltage stabilizing circuit of a power factor correction Output voltage stabilizing circuit of a power factor correction

1997-09-03

1999-06-01

Riley, Shawn

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 49, 323222, H02M 3335

Patent

active

059093617

ABSTRACT:
An output voltage stabilizing circuit of a power factor correction circuit, which initially stabilizes an output voltage of a power factor correction circuit by controlling an on/off timing of a reference oscillating waveform which varies in response to an error voltage in accordance with a charge/discharge voltage outputted from a soft start circuit section. The output voltage stabilizing circuit includes a flyback transformer (FBT) connected to a secondary winding of an output transformer for applying a high voltage and outputting a sync signal, a first control driving section for outputting a switching control signal of the FBT, a soft start circuit for charging or discharging according to a first output of the SMPS transformer, a switching section for controlling the operation of charging or discharging of the soft start circuit in response to the sync signal of the FBT, an error amplifier for amplifying the output voltage of the power factor correction circuit section according to the switching operation of the switching section, comparing section for comparing an output voltage of the error amplifier with the initial output voltage of the power factor correction circuit section and outputting a voltage as a result of comparison, and a second control driving section for controlling a duty ratio to stabilize the initial output voltage of the power factor correction circuit section according to the output voltage of the comparing section.

REFERENCES:
patent: 4412167 (1983-10-01), Green et al.
patent: 4890210 (1989-12-01), Myers
patent: 5363020 (1994-11-01), Chen et al.
patent: 5420780 (1995-05-01), Bernstein et al.
patent: 5675485 (1997-10-01), Seong

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