Switch-mode power supply

Details Switch-mode power supply Switch-mode power supply

2007-07-06

2009-10-06

Paladini, Albert W (Department: 2836)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

C307S125000

Reexamination Certificate

active

07598627

ABSTRACT:
A switch-mode power supply for selectively providing power from a main power source and a standby power source to an electronic device is provided. The switch-mode power supply includes a signal input, a first transistor, a second transistor, a driving circuit, and a switching circuit. The signal input is used for receiving a control signal. The driving circuit and switching circuit connect the signal input to the gate of the second transistor in series. When the driving circuit detects the first transistor is switched off, the gate of the second transistor is immediately pulled up to open the second transistor, and when the driving circuit detects the first transistor is switched on, the gate of the second transistor is immediately pulled down to close the second transistor.

REFERENCES:
patent: 4754160 (1988-06-01), Ely
patent: 4788450 (1988-11-01), Wagner
patent: 5598041 (1997-01-01), Willis
patent: 6314523 (2001-11-01), Voltz
patent: 6642697 (2003-11-01), Zuniga et al.
patent: 7420295 (2008-09-01), Omae et al.

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