Switching power supply utilizing switch-selectable resistors to determine output voltage
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United States of America Patent
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-
Nov 11, 2008
Grant Date -
Dec 6, 2007
app pub date -
Aug 9, 2007
filing date -
Apr 26, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A switching power supply includes a source of DC voltage and a transformer having primary and secondary windings. A switching circuit is coupled between the DC voltage and the primary winding to provide alternating current to the primary winding. A rectifier circuit is coupled to the secondary winding to provide a DC output voltage. A controller circuit controls the switching circuit to modulate the alternating current provided to the primary winding. A circuit receives a first input signal having a magnitude which is determined by the DC output voltage and a second input signal having a magnitude which is determined by a selected position of a multiposition switch. An output of the circuit generates a feedback signal which is coupled to the controller circuit.
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