Active clamp used to maintain proper current transformer operati

Details Active clamp used to maintain proper current transformer operati Active clamp used to maintain proper current transformer operati

1997-03-28

1999-07-13

Nguyen, Matthew

Electric power conversion systems

Current conversion

Including automatic or integral protection means

H02M 7122

Patent

active

059235489

ABSTRACT:
An active clamp used to maintain proper current transformer operation in a resonant transition converter circuit or any circuit having a wide range of reverse current present in a current transformer primary at the beginning of a power pulse. The active clamp is connected directly to a secondary of the current transformer and is placed in an active state for the duration of the "on" time of a switch associated with a particular current transformer. A diode, FET combination of the active clamp provides a path for current to flow when primary current is reversed or negative flow. Thereby only small amounts of voltage, and thus volt-seconds will be developed on the transformer during reverse primary current, in turn keeping the current transformer out of reverse saturation. A resistive-capacitive network allows the active clamp to use the circuit drive signal to place the active clamp in an on state.

REFERENCES:
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patent: 4659942 (1987-04-01), Volp
patent: 4958268 (1990-09-01), Nagagata et al.
patent: 5057698 (1991-10-01), Widener et al.
patent: 5068776 (1991-11-01), Polivka
patent: 5157592 (1992-10-01), Walters
patent: 5379206 (1995-01-01), Davidson
patent: 5418703 (1995-05-01), Hitchcock et al.
patent: 5488554 (1996-01-01), Green
patent: 5610508 (1997-03-01), Kammiller
patent: 5636107 (1997-06-01), Lu et al.

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