| 摘要 |
PURPOSE:To prevent the trigger operation of a trigger circuit by connecting a condenser for a noise power source bypass to the secondary side of a pulse transformer. CONSTITUTION:A condenser 17 for a noise current bypass is connected in parallel with the secondary coil of a pulse transformer 10. When a trigger switch 9 is opened so that a noise voltage is applied from a noise source 15 to between the input and the output of the trigger circuit, the noise current I1a does not flow through the secondary coil of the transformer 10 having high impedance, but entirely flows through the condenser 17. Accordingly, no gate current to erroneously operate a triac 3 flows. |
