Switch mode converter and improved primary switch drive therefor

Details Switch mode converter and improved primary switch drive therefor Switch mode converter and improved primary switch drive therefor

1985-04-11

1986-12-16

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

363 16, 307270, H03K 1700

Patent

active

046299718

ABSTRACT:
A switch mode converter is disclosed which has an improved base drive therefor. The switch mode converter includes a pair of primary transistor switches each of which is connected to a transformer having a feedback winding connected to the respective transistor in a proportional base drive configuration. A controller circuit controls a switch connected in series with the primary winding of each transformer to switch the current supplied to the primary winding of each transformer from first and second current supplying circuits. Each second current supplying circuit temporarily supplies current to the transformer during the time that the respective transistor is being switched off to shorten the turn-off time of the transistor. The second current supplying circuits are coupled to the output of the primary switches and each is supplied with energy only when the respective transistor is switched on, and therefore do not saturate the transformer or continuously dissipate power.

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