Direct current detection circuit

Details Direct current detection circuit Direct current detection circuit

2007-02-13

2007-02-13

Hollington, Jermele (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

Reexamination Certificate

active

10901249

ABSTRACT:
A direct current detection circuit has a zero-phase current transformer with source lines inserted therethrough for detecting current differences among them and generates a comparison voltage value based on a divided voltage value obtained between the zero-phase current transformer and a voltage divider resistor according to a change in the self-impedance of the zero-phase current transformer. An offset current is passed through the zero-phase current transformer to make it possible to detect on the basis of the comparison voltage value a direct current value in a range which is otherwise difficult to detect accurately on the basis of the comparison voltage value because of influence of hysteresis characteristic of the zero-phase current transformer. A control circuit detects a present direct current value based on the comparison voltage value and the value of the offset current.

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European Search Report, Application No. EP04017130, Nov. 24, 2004.

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