Galvanically isolated voltage sensing circuit

Details Galvanically isolated voltage sensing circuit Galvanically isolated voltage sensing circuit

2005-04-26

2005-04-26

Zarneke, David (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Modulator/demodulator

C324S765010, C324S1540PB

Reexamination Certificate

active

06885184

ABSTRACT:
Method and apparatus for galvanically isolated voltage sensing circuit. A circuit includes a scaling device that provides a scaled signal of an input voltage to a modulator. An oscillator provides a carrier frequency to the modulator, the modulator modulating the scaled signal with the carrier frequency to produce a modulated scaled signal. An isolation transformer is coupled to an output of the modulator. The isolation transformer receives the modulated scaled signal. A demodulator is coupled to an output of the isolation transformer and demodulates the modulated scaled signal to produce an input voltage signal representative of the scaled signal.

REFERENCES:
patent: 5917379 (1999-06-01), Ashby et al.
patent: 6590379 (2003-07-01), Mercier

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