Current sensing structure for integrated power switches

Details Current sensing structure for integrated power switches Current sensing structure for integrated power switches

2007-04-10

2007-04-10

Patel, Rajnikant B. (Department: 2838)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

C324S765010, C363S070000, C363S080000, C323S282000

Reexamination Certificate

active

11039137

ABSTRACT:
Circuits and methods to sense the current through a coil of an integrated switching converter, applicable to boost and to buck converters, have been achieved. The present invention uses a “replica biasing” technique to avoid a resistor for current measurement. The current through a pass device is mirrored into a replica, having a scale of n and being much smaller in size, of said pass device. The current through the replica is mirrored to another branch of the circuit and back again to achieve a fast stabilization of the current. The current through the replica is mirrored again to an output branch of the circuit, which conducts exactly a fraction 1
of the current flowing through the pass device. The self-biasing current loop of the invention adapts quickly to the actual current level through the pass device of the switching converter. Accuracies better than 5% are achieved over a wide range of dynamic range.

REFERENCES:
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“CMOS Analog Circuit Design”, by Allen et al., Oxford University press 1987, p. 248.

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