Electrical transmission or interconnection systems – Plural supply circuits or sources
Patent
1995-07-18
1997-08-26
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
363 21, 363 61, 363126, 363143, 323282, H02J 301
Patent
active
056613482
ABSTRACT:
A universal offline switch mode power supply including an input stage having an input filter inductor and a switch for switching between a first lower AC input voltage or a second higher AC input voltage. A bridge rectifier full-wave rectifies the higher AC voltage when the switch is in a first position, where the filter inductor serves to filter the higher AC voltage. The higher AC voltage is preferably approximately 230 V rms. The bridge rectifier and two bulk capacitors serve to double the lower AC voltage when the switch is in a second position, where the lower AC voltage is preferably approximately 115 V rms. Also, the input filter is bypassed for the lower AC voltage. The switch is preferably an SPST switch. In the preferred embodiment, the inductor is placed between one AC input line and one input of a bridge rectifier circuit. The outputs of the bridge rectifier circuit are placed across two series input bulk capacitors and to the input of a switchmode power converter. The switch is placed between the same AC input line coupled to the inductor and the junction between the bulk capacitors. When the switch is in its closed position, the filter inductor is effectively bypassed and the diodes of the bridge rectifier circuit and the bulk capacitors serve as a voltage doubler for 115 V rms operation. With the switch is in its open position, the filter inductor performs filtering for the 230 V rms operation and the bridge rectifier circuit full-wave rectifies the AC input voltage.
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patent: 5138547 (1992-08-01), Swoboda
patent: 5162984 (1992-11-01), Castagnet et al.
Dell USA L.P.
Paladini Albert W.
Shoop Jr. William M.
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