DC CURRENT DETECTOR

PURPOSE:To provide a DC current detector which can detect current highly accurately regardless of temperature fluctuation. CONSTITUTION:Currents to be detected are fed in mutually reverse directions through the primary windings n11, n12 of an AC transformer and switch elements 13, 14 are turned on/off alternately at a constant period by means of a logic circuit 15 thus inducing an AC current in the secondary winding n2. The AC current is converted through a DC regenerating circuit 16 into a DC current and a DC current corresponding to the turn ratio between the primary windings n11, n12 and the secondary winding n2 is created from the current to be detected. The DC current thus created is then converted through a resistor 17 into a voltage which is smoothed through a smoothing circuit 18 and delivered, as a monitor voltage, from a detection voltage output terminal 19.