G - Physics – 05 – F
Patent
G - Physics
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F
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G05F 3/06 (2006.01) H02M 3/337 (2006.01)
Patent
CA 1068335
Title of the Invention TRANSFORMER SATURATION CONTROL CIRCUIT FOR A HIGH FREQUENCY SWITCHING POWER SUPPLY Abstract of the Disclosure 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 con- sequence 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 un- balanced primary winding currents and ultimately in a premature saturation of the transformer core in one direction. The pre- sent circuit controls unbalanced transformer core saturation by forcing the core into saturation in alternate opposite di- rections 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 re- set (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 dur- ing the power switching elements drive time.
277092
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