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Increased Efficiency Vhf Rectifier/Filter Disclosure Number: IPCOM000047799D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08

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Dobberstein, EA [+details]


Low output voltage power supplies, based upon switching conversion of a high bulk input voltage, use Schottky diodes in their output rectifier/filter stages for obtaining low voltage drop and fast switching characteristics, as suggested in Fig. 1. A circuit of this type is illustrated in Fig. 2. However, with the present trend towards lower voltages for computer power supplies there is a corresponding trend towards operating such low forward drop circuits with decreasing efficiency since, at lower output voltages, the rectifier/filter circuit has a fixed loss at a given current which becomes the dominant factor in determining the efficiency of high frequency switching. For example, a Schottky rectifier operating into an L-C filter (in a circuit configuration such as that shown in Fig.