H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/27, 323/4
H02M 3/335 (2006.01)
Patent
CA 1229873
ABSTRACT OF THE DISCLOSURE A swiching power source circuit intermittently switches a primary winding current of a transformer according to a repeatedly switching bipolar transistor,rectifying and smoothing an output voltage induced at a secondary transformer winding. A capacitor is charged by a voltage induced by a feedback winding of the transformer. The base-emitter path of the bipolar transistor is reverse biased by the capacitor voltage to perform high-speed switching, so that a compact transformer and capacitor can be used, and the switching power source circuit becomes low in cost. The application of the reverse bias voltage is performed by a transistor which is turned on when an emitter grounded through a resistor) voltage of the bipolar transistor is increased to a predetermined level (threshold). A switching period of the bipolar transistor is determined by an R-C period determining circuit. The capacitor of this circuit is charged to reverse bias the bipolar transistor when the bipolar transistor is turned on, and is discharged when the bipolar transistor is turned off. An auxiliary winding is arranged in the transformer to detect flyback energy, and the ON and OFF times of the bipolar transistor are controlled to stabilize the output voltage even in an overload.
470684
R. William Wray & Associates
Stanley Electric Co. Ltd.
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