Transformer saturation control circuit for a high frequency swit

Details Transformer saturation control circuit for a high frequency swit Transformer saturation control circuit for a high frequency swit

1976-07-26

1977-04-12

Shoop, William M.

321 11, H02M 7537

Patent

active

040177866

ABSTRACT:
The present circuit prevents the overloading of power switching elements driving the primary winding of a saturable core transformer. The overloading protected against is a consequence of the differential between the volt-seconds supplied to the transformer core from one direction as opposed to the other direction, which differential, in turn, causes the flux level to integrate up the B-H loop resulting initially in unbalanced primary winding currents and ultimately in a premature saturation of the transformer core in one direction. The present circuit controls unbalanced transformer core saturation by forcing the core into saturation in alternate opposite directions during the periods when the power switching elements are off when core saturation can have no deleterious effect on the circuit operation. This is accomplished by providing a reset (bias) current to the transformer core during each off time, which reset current is in a direction that reenforces the trend towards saturation caused by the latest activation of the power switching elements. The effect is that when the next power switching element is activated it looks at a flux level which is as far away from its associated saturation point as possible. This in turn permits a maximum excursion of flux during the power switching elements drive time.

REFERENCES:
patent: 3133241 (1964-05-01), White
patent: 3349311 (1967-10-01), Dudley
patent: 3539905 (1970-11-01), Schwarz

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