Transformerless low voltage switching power supply

Details Transformerless low voltage switching power supply Transformerless low voltage switching power supply

1993-04-30

1995-11-21

Sterrett, Jeffrey L.

Electricity: power supply or regulation systems

Output level responsive

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

323285, 323282, G05F 1565

Patent

active

054690463

ABSTRACT:
A power supply system employs a control circuit to regulate the voltage across a load capacitor by monitoring the capacitor voltage by means of a differential voltage sensor and by monitoring the drain-source voltage of a switching power FET connected in series with the load capacitor across input terminals that supply a full wave rectified voltage derived from a commercial AC supply voltage. The control circuit controls the switching action of the power FET in a manner such that the load capacitor is charged at least once during each cycle of the rectified voltage (unfiltered). This method of voltage regulation by monitoring the load capacitor voltage and the FET voltage (V.sub.ds) provides significant advantages over other forms of voltage regulation.

REFERENCES:
patent: 3323034 (1967-05-01), Dubin et al.
patent: 4242629 (1980-12-01), Shuey
patent: 4685046 (1987-08-01), Sanders
patent: 4709322 (1987-11-01), Mirow
patent: 4771373 (1988-09-01), Rademaker
patent: 4967138 (1990-10-01), Obergfell et al.
patent: 5180964 (1993-01-01), Ewing
patent: 5373225 (1994-12-01), Poletto et al.

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