PROTECTIVE CIRCUIT

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PROBLEM TO BE SOLVED : To provide a circuit, capable of protecting a flyback transformer from abnormality occurrence at an earlier stage by detecting the damper current of a switching circuit, even if abnormalities occur in the flyback transformer of a high-voltage stabilization method. SOLUTION : A current flowing through the damper diode of the high-voltage output switching circuit is detected for checking the abnormal stage of a switching operation. Thus, generation of rare short circuit in the flyback transformer at an earlier state even in a high-voltage stabilization operation, and the high-voltage output switching is stopped. COPYRIGHT : (C)2006, JPO&NCIPI