Dual voltage power supply

Details Dual voltage power supply Dual voltage power supply

1994-03-15

1995-05-02

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

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

323222, 323272, 307 75, G05F 1577

Patent

active

054123089

ABSTRACT:
A high efficiency power supply for producing two regulated output voltages (i.e. 3.3 and 5 volts) from an unregulated input voltage. The supply includes a 4-15 volt battery pack, a first (5.0 volt) output, a second (3.3 volt) output, and a ground. The positive terminal of the battery is connected directly to the second output. The 3.3 volt differential with ground is maintained by a voltage regulator that couples the negative terminal of the battery pack to ground (i.e. ground floats relative to the battery). A second voltage regulator couples the positive terminal of the battery pack to the first output, and maintains this first output at 5.0 volts relative to ground. This latter regulator is capable of boost operation, permitting a 5.0 volt output to be maintained even if the battery pack voltage is less than this value. Neither regulator includes a transformer, making the supply particularly well suited for use in miniaturized equipment, such as palmtop computers.

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Huffman, "Switching Regulator Provides a Constant 5V Output from 3.5V to 40V Input Without the Use of a Transformer," Linear Technology Corporation, Jul. 30, 1992, 6 pages.
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Williams, "Switching Regulators for Poets," Linear Technology Corporation Linear Applications Handbook, A Guide to Linear Circuit Design, 1990, Application Note 25, Sep., 1987, pp. AN25-1-AN25-24.
Huffman, "Switching Regulator Circuit Collection," Linear Technology Corporation Linear Applications Handbook, A Guide to Linear Circuit Design, 1990, Application Note 30, Feb., 1989, pp. AN30-1-AN30-44.
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Huffman, "A Battery Powered Lap Top Computer Power Supply," Linear Technology Corporation Linear Applications Handbook, A Guide to Linear Circuit Design, 1990, Design Notes, DN18-1-DN18-2.

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