Bi-directional energy diode converter using multipulse control

Details Bi-directional energy diode converter using multipulse control Bi-directional energy diode converter using multipulse control

1998-02-23

1999-12-07

Han, Y. J.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 16, 363 17, 363 98, H02H 7125

Patent

active

05999424&

ABSTRACT:
A control method and apparatus for reducing transformer core volume in a power converter of the type having a switching circuit coupled to a primary winding of the transformer for selectively coupling the primary winding to a dc voltage source, a secondary winding of the transformer being coupled to an output rectifier circuit for developing a relatively high dc voltage across an output capacitor. The apparatus includes a high voltage zener diode clamp for limiting the maximum voltage on the capacitor, and the rectifier circuit includes at least a pair of zener diodes connected for blocking reverse current flow through the rectifier circuit. The method includes the steps of coupling the transformer primary winding to the dc voltage source to establish a relatively short resonant charging pulse for developing an initial charging current to the output capacitor, disconnecting the dc voltage source from the transformer primary winding for a time interval which is relatively long with respect to the charging interval to allow the transformer reactances and resonant capacitor to reset to zero energy conditions, and repeating the steps of coupling and disconnecting until the output capacitor is charged to the zener clamp voltage. A reverse process is used to step-wise discharge the output capacitor.

REFERENCES:
patent: 4527228 (1985-07-01), Chi Yu
patent: 4578732 (1986-03-01), Draper et al.

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