Full duty cycle forward converter

Details Full duty cycle forward converter Full duty cycle forward converter

1990-05-10

1992-05-26

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 21, 363 97, 363 16, H02M 3335

Patent

active

051173476

ABSTRACT:
This invention discloses apparatus and methods for increasing the duty cycle of forward converters up to 90 percent by adding a quasi-resonant network to the primary circuit. The quasi-resonant network removes the parasitic energy from the primary winding of the transformer during the OFF period of the forward converter. The parasitic energy is stored in a capacitor in the quasi-resonant network. A portion of the stored energy is recovered and transferred back to the input energy source. The increased duty cycle enables the forward converter to maintain a substantially constant output voltage over a wide range of input voltages. In addition, the invention requires less parts and is thus more reliable than previous energy recovery networks. It contains no resistors, which accounts for less loss. It also causes less electromagnetic interference than other methods.

REFERENCES:
patent: 4675796 (1987-06-01), Gautherin et al.
patent: 4760512 (1988-07-01), Loftus
patent: 4783727 (1988-11-01), Neumann

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