Circuitry to maintain proper current transformer operation

Details Circuitry to maintain proper current transformer operation Circuitry to maintain proper current transformer operation

1994-06-16

1997-03-11

Hecker, Stuart N.

Electricity: power supply or regulation systems

Including a transformer or an inductor

Current transformer

363 97, H01F 3828, H02M 324

Patent

active

056105088

ABSTRACT:
A circuit 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 circuit includes an active clamp which is applied to an extra secondary on the current transformer for the duration of a "on" time of a switch associated with a particular current transformer. A diode of the active clamp is polarized to accept current in the secondary 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 current generator provides a bias current during the on time of the switch associated with the particular current transformer and switches a bias current into the main current transformer secondary during the power pulse to offset the negative primary current which occurs at the beginning of a power pulse.

REFERENCES:
patent: 4605865 (1986-08-01), Yuzurihara
patent: 4659942 (1987-04-01), Volp
patent: 4922404 (1990-05-01), Ludwig et al.
patent: 4958268 (1990-09-01), Negagata et al.
patent: 5057698 (1991-10-01), Widener et al.
patent: 5068776 (1991-11-01), Polivka
patent: 5157592 (1992-10-01), Walters
patent: 5418703 (1995-05-01), Hitchcock et al.

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