North Electric Company

Kenneth A Wallace

A transformer-coupled transistor base drive circuit is disclosed wherein the transformer primary control circuit includes a switching transistor, a bias supply, and a RC biasing network arrangement. The biasing arrangement is designed to ensure that the transformer core will never enter the positive saturation region of its hysteresis characteristic; regardless of variations in the power transistor duty cycle. The base drive circuit also features provision of high sweep-out current in the power transistor base during turn-off, reverse base-emitter voltage during the power transistor off state, and regenerative current drive to minimize storage time and to control the bias power drain.

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Franklin, OH, United States of America

Kenneth A Wallace