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Dual Voltage Input Power Supply Disclosure Number: IPCOM000060851D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09

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Maddock, D [+details]


A power supply includes a bridge rectifier, a pair of smoothing capacitors and a control circuit. When a 240-volt input is supplied, the bridge rectifier acts as a normal bridge. When a 110-volt input is supplied, this is detected by the control circuit which closes a switch to reconfigure the bridge on capacitors to act as a voltage doubling circuit. Thus the power supply will automatically produce roughly the same DC output voltage with an input of 240 V or 110 V. A long time constant circuit is included in the control circuit so that voltage spikes are ignored.