Development of a Corona Discharge Detector for Flyback Transformers

This paper describes a new corona discharge detector for flyback transformers. It can detect corona discharges which are generated by the flyback pulse and have a great effect on the reliability of flyback transformers. It also adds greatly to the insulation design and quality control of flyback transformers. In measurement of corona discharges generated by flyback pulses, harmonic components of the flyback pulse act as noise and interfere with the detection of corona signals. This detector has improved the S/N ratio extremely by transforming the corona signals and the harmonic components to digital signals and calculating their values. Also, this paper gives some explanations of a New Hermetically-Sealed Flyback Transformer, which was developed by using the detector in insulation design, and of an application for the quality control of the resin-molded flyback transformers which have a tendency to incur corona discharges.