| 摘要 |
A transistor protection circuit of a monitor for protecting a transistor from a high voltage liable to instantaneously occur during a power on/off or mode conversion includes a driving transformer for generating a high voltage driving signal according to a horizontal oscillating signal, a transistor which switches according the high voltage driving signal received into a base thereof and having an emitter being grounded, a flyback transformer connected to a collector of the transistor for generating a high voltage, and a high voltage cutoff unit connected between the base and collector of the transistor. Thus, the high voltage of the flyback transformer supplied to the collector of the transistor is bypassed to the high voltage cutoff unit when an abnormal high voltage instantaneously occurs to thereby protect the transistor.
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