Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1997-12-10
1999-06-08
Hecker, Stuart N.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 97, 315411, H02M 3335, H01J 2970
Patent
active
059108878
ABSTRACT:
An apparatus for controlling a switching frequency of a switching mode power supply (SMPS) for a video display appliance which can remove a switching noise generated during the switching-on and switching-off operations of an SMPS transformer by controlling the switching frequency of the SMPS transformer so that the duty of the SMPS transformer is kept in a predetermined range. The apparatus includes a flyback transformer for converting the voltage outputted from the SMPS transformer into a high voltage in accordance with a horizontal sync signal inputted thereto, a control section for outputting a control signal in accordance with the horizontal sync signal, a dividing section for dividing the horizontal sync signal in accordance with the control signal, a pulse transformer for outputting a predetermined pulse signal in accordance with an output pulse signal of the dividing section, a differentiation section for differentiating the pulse signal outputted from the pulse transformer to eliminate a negative pulse component of the pulse signal, a sawtooth sync generating section for generating a sawtooth sync signal by performing a switching operation in accordance with an output signal of the differentiation section, and a switching control section for outputting the switching frequency for a switching operation of the SMPS transformer in accordance with the sawtooth sync signal.
REFERENCES:
patent: 4368409 (1983-01-01), Sivanesan et al.
patent: 4387399 (1983-06-01), Novotny
patent: 5644198 (1997-07-01), Park
patent: 5656890 (1997-08-01), Park
patent: 5764495 (1998-06-01), Faulk
Hecker Stuart N.
LG Electronics Inc.
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