Power supply circuit with pulse generating circuit and current-limiting circuit
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United States of America Patent
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N/A
Issued Date -
Oct 2, 2008
app pub date -
Mar 31, 2008
filing date -
Mar 30, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An exemplary power supply circuit (200) includes a transformer (240), a first transistor (260), a start-up resistor (261), and a pulse generating circuit (250). The transformer includes a primary winding (241), a secondary winding (243), and an auxiliary winding (242). The first bipolar junction transistor includes a collector connected to a first terminal of the primary winding and an emitter grounded. The start-up resistor is connected between a second terminal of the primary winding and a base of the bipolar junction transistor. The pulse generating circuit is configured for generating a control signal according to an induction voltage of the auxiliary winding. The control signal is provided to the base of the first bipolar junction transistor for switching the first bipolar junction transistor.
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