Power supply circuit having a DC-DC conversion circuit and...

Details Power supply circuit having a DC-DC conversion circuit and... Power supply circuit having a DC-DC conversion circuit and...

2006-02-14

2006-02-14

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S274000, C323S284000

Reexamination Certificate

active

06998824

ABSTRACT:
A power supply circuit includes a DC—DC conversion circuit including a high side transistor and a low side transistor connected in series between a power supply voltage and a reference potential and producing a voltage as PWM controlled output which is obtained by turning “on” and “off” each of the transistors with each PWM signal. The power supply circuit also includes a PWM circuit and output driver that detects a level of an intermediate node potential at a junction point of the high side transistor and the low side transistor after turning “off” the high side transistor, and turning “on” the low side transistor when the intermediate node potential becomes below or equal to a predetermined potential.

REFERENCES:
patent: 5805433 (1998-09-01), Wood
patent: 5982160 (1999-11-01), Walters et al.
patent: 6246220 (2001-06-01), Isham et al.
patent: 6791306 (2004-09-01), Walters et al.
patent: 6798180 (2004-09-01), Sase et al.
patent: 2000-092824 (2000-03-01), None
patent: 2001-037213 (2001-02-01), None
patent: 2002-526013 (2002-08-01), None
patent: 2004-023846 (2004-01-01), None
patent: 00/16469 (2000-03-01), None

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