| 摘要 |
PURPOSE: A system for detecting a thyristor phenomenon of a diode is provided to exactly and quickly detect a bad diode in which a thyristor phenomenon occurs by passing a plurality of current bands to the diode. CONSTITUTION: A constant current generator(40) supplies a constant current to a diode(90) to be measured. A voltage detector(60) measures a voltage across the diode(90) to be measured. A controller(10) receives the first voltage which is firstly detected by the voltage detector(60), applies the second voltage greater than the first voltage to two terminals of the diode(90). When the voltage detected by the voltage detector(60) is identical with the first voltage, the controller(10) judges that the diode(90) to be measured is in a normal state. When the voltage detected by the voltage detector(60) is identical with the second voltage, the controller(10) judges that the diode(90) to be measured is in a bad state.
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