US Patent 7176673 Direct current detection circuit
Patent 7176673 was granted and assigned to Omron on February, 2007 by the United States Patent and Trademark Office.
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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.
US Patent 07176673 Direct current detection circuit US Patent 7176673 Direct current detection circuit
US Patent 07176673 Direct current detection circuit
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