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Suppressing DC plug insertion surge

IP.com Disclosure Number: IPCOM000057507D
Original Publication Date: 2005-Feb-15
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Abstract

Disclosed is a circuit to suppress transient voltage which is generated when a DC plug is plugged to a notebook PC. This transient is modeled by an L-C resonant circuit. Therefore the transient is dumped by a dumper resistor of the critical damping value. Combining this resistor and a DC block capacitor suppresses the transient without wasting power.