Switched damper circuit for dc to dc power converters

Details Switched damper circuit for dc to dc power converters Switched damper circuit for dc to dc power converters

1989-12-21

1991-03-26

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 21, H02M 3335

Patent

active

050034510

ABSTRACT:
A damper circuit for switching power supplies to improve the stability thereof with high efficiency. A resistor, having a value which critically damps the flyback transformer in the supply, is selectively coupled to the transformer by a switch when the switching transistor is disabled. The decoupling of the resistor when the switching transistor is on reduces power dissipation, compared to passive damping techniques, and allows integration of the damper onto the same IC as the control circuits of the supply. The damper increases the stability of the supply by absorbing excess energy not transferred to the load. The excess energy would instead be dissipated in the transistor and upsetting the control circuits of the supply, leading to instability of thereof. In addition, a clamp circuit is provided which keeps the switch from turning on due to high slew rate transients across the transformer from the turn-on of the switching transistor.

REFERENCES:
patent: 4063306 (1977-12-01), Perkins et al.
patent: 4389702 (1983-06-01), Clemente et al.
patent: 4402039 (1983-08-01), Jirka
patent: 4499532 (1985-02-01), Hudson et al.
patent: 4616300 (1986-10-01), Santelmann, Jr.
patent: 4704670 (1987-11-01), Gradl et al.
High-Frequency Power Supplies Theory & Design, George Chryssis, pp. 11 through 24, 60 through 63, McGraw-Hill Book Company, 1984.

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