Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1997-10-28
1999-06-29
Riley, Shawn
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
H02M 3335
Patent
active
059177152
ABSTRACT:
A forward converter having an improved power factor and suppressing a harmonic noise component appearing at an input current waveform. The forward converter includes a bridge diode, a first smoothing capacitor, a control circuit, a switching element, a transformer, a waveform shaper, a rectifying element, and a second smoothing capacitor. The bridge diode full-wave rectifies an AC input voltage to generate a first DC voltage. The first smoothing capacitor smooths the first DC voltage to generate a second DC voltage. The control circuit generates a switching control signal in response to an input of the second DC voltage. The switching element, which is connected between the first smoothing capacitor and a ground terminal, switches on or off in response to the switching control signal. The transformer, having a primary winding and a secondary winding, receives the second DC voltage through the primary winding when the switching element is switched on, and induces the second DC voltage to the secondary winding. The waveform shaper, which is connected between the bridge diode and the first smoothing capacitor, causes a current flowing into the first smoothing capacitor to have a sine waveform. The rectifying element, which is connected between the secondary winding of the transformer and a load, rectifies a DC voltage induced to the secondary winding to generate a third DC voltage. The second smoothing capacitor smooths the third DC voltage to supply a stable DC voltage to the load.
REFERENCES:
patent: 4355353 (1982-10-01), Farrer
patent: 4541039 (1985-09-01), Sandller
patent: 4561046 (1985-12-01), Kuster
patent: 4870554 (1989-09-01), Smith
Riley Shawn
Samsung Electronics Co,. Ltd.
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