High-side current sense circuit with common-mode voltage...

Details High-side current sense circuit with common-mode voltage... High-side current sense circuit with common-mode voltage...

2007-05-17

2009-12-15

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S052000, C324S522000

Reexamination Certificate

active

07633317

ABSTRACT:
A high-side current sense circuit comprises a sense resistance Rsenseconnected in series with a signal having an associated current to be measured I, which develops voltages V1and V2on either side of Rsense. A differential gain stage powered by supply voltages VCC and VEE produces an output voltage which varies with the difference between its input signals. To keep the common mode portion of the input signal between voltages VCC and VEE, a voltage modification circuit subtracts or adds a common mode voltage to or from V1and V2to produce modified voltages V1′ and V2′, which are coupled to the gain stage inputs. The voltage modification circuit is arranged to ensure that VEE≦V1′ and V2′≦VCC.

REFERENCES:
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patent: 2007/0273409 (2007-11-01), Pai
Analog Devices; “Secondary-Side Controller With Current Share and Housekeeping” ; ADM1041; Rev. A; pp. 1-64.

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