Power supply device and electronic equipment

Details Power supply device and electronic equipment Power supply device and electronic equipment

2005-01-25

2005-01-25

DeBeradinis, Robert L. (Department: 2836)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Connecting or disconnecting

C307S031000, C307S064000, C307S066000

Reexamination Certificate

active

06847131

ABSTRACT:
A power supply device is presented which can provide a sufficiently long ending process time to an electronic equipment connected thereto even if an input voltage is disconnected abnormally and reduces the circuit area and the power consumption. The power supply device includes a switching power supply section for receiving a DC voltage as an input voltage at a primary side, switching the inputted DC voltage and generating a stabilized output DC voltage at a secondary side isolated from the primary side, a current detection section for generating a synchronization pulse synchronized with supply current to the switching power supply section, and a control section for outputting a detection pulse to convey disconnection of an AC input to the switching power supply section to the electronic equipment side based on the synchronization pulse.

REFERENCES:
patent: 4360853 (1982-11-01), Welk
patent: 4441148 (1984-04-01), Hirata
patent: 5811895 (1998-09-01), Suzuki et al.
patent: 6351401 (2002-02-01), Scheel et al.
patent: 6597074 (2003-07-01), Tsujikado et al.

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