Buck regulator circuit for use in a power supply
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United States of America Patent
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May 14, 2002
Grant Date -
N/A
app pub date -
Sep 13, 2001
filing date -
Sep 13, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a modified buck regulator circuit capable of providing two output voltage levels. The circuit includes an inductive element connected between the input and output of the circuit. Further, the circuit includes an auto-transformer and two switches creating separate current paths with a load connected to the output of the circuit. In one mode, the switches are operated in parallel to provide a first voltage across the load. Because the switches are in parallel with respect to each other, the load current is divided between the two switches. In a second mode, the switches are operated in a push-pull mode. In this mode, the auto-transformer steps down the load voltage and also effectively steps down the current across each switch. As such, the buck regulator circuit of the present invention may provide two separate voltages, while also reducing the current across the switches of the buck regulator circuit.
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