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MOSFETs and their control for bridge diodes

IP.com Disclosure Number: IPCOM000014988D
Original Publication Date: 2002-Jan-22
Included in the Prior Art Database: 2003-Jun-20

Publishing Venue

IBM

Abstract

Summary of invention : This invention is related to the AC/DC power supply and enables to make the input line ON/OFF dynamically with a MOSFET in the power supply. The MOSFET is located immediately after the AC voltage rectifying bridge diode. The following merits are brought by this invention. 1. By turning off the MOSFET, protection against over-current is possible without cutting the fuse in the input line. 2. By turning on the MOSFET gradually(soft start), inrush current to the power supply is prohibited. Conventional power supply had a relay and a resistor in parallel in the input line to prevent the inrush current.