System for current sensing in switched DC-to-DC converters

Details System for current sensing in switched DC-to-DC converters System for current sensing in switched DC-to-DC converters

2008-05-20

2008-05-20

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S299000, C323S288000

Reexamination Certificate

active

07375503

ABSTRACT:
A system for sensing the supply current of a switched DC-to-DC converter. The system includes a first circuit that senses a first voltage that is proportional to the supply current, wherein the first voltage has first ripple; a second circuit coupled to the first circuit, wherein the second circuit outputs a second voltage that is based on the first voltage, and wherein the second voltage has a second ripple that is smaller than the first ripple; and a third circuit coupled to the second circuit, wherein the third circuit compares the second voltage to a reference voltage to provide an indication of the supply current.

REFERENCES:
patent: 4682081 (1987-07-01), Sikora
patent: 5028861 (1991-07-01), Pace et al.
patent: 6466188 (2002-10-01), Cato
patent: 7095215 (2006-08-01), Liu et al.
patent: 2003/0107358 (2003-06-01), Isham
patent: 2003/0111984 (2003-06-01), Isham
patent: 2005/0127888 (2005-06-01), Marschalkowski et al.

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