Low noise forward/flyback switching power supply

Details Low noise forward/flyback switching power supply Low noise forward/flyback switching power supply

1998-03-31

2000-01-04

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

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

363 25, 363 97, H02M 3335, H02M 324

Patent

active

060117028

ABSTRACT:
Low noise DC/DC switching power supply employs a transformer, a main switch and an auxiliary switch. The auxiliary switch merely reflects the switching of the main switch and has lower voltage ratings. A maximum noise suppression is accomplished when both switches have the same current ratings. The power supply takes advantage of some resonant properties but operates in forward and/or flyback square wave modes. When the main switch is turned off, a leakage energy stored in the transformer is delivered to a capacitor. Subsequently, both switches are turned on, wherein the capacitor voltage is applied across the primary winding of the transformer. When the capacitor voltage is reduced to a desired value, the auxiliary switch turns off, wherein the primary voltage is reduced to the input voltage. The difference between both primary voltages is thus regulated. The EMI/RFI performance of the power supply is dramatically improved. A discontinuous mode allows uninterrupted input current at any time.

REFERENCES:
patent: 5239453 (1993-08-01), Remson
patent: 5267132 (1993-11-01), Gulcznski
patent: 5301095 (1994-04-01), Termoto et al.
patent: 5440473 (1995-08-01), Ishii et al.
patent: 5570278 (1996-10-01), Cross
patent: 5600546 (1997-02-01), Ho et al.
patent: 5637988 (1997-06-01), Gucyski
patent: 5652700 (1997-07-01), Tsai et al.

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