How to check the stand or fall of bidirectional thyristor
: two-way thyristor as an electronic switch, can control the ac load (
Such as incandescent light bulbs)
On and off, according to destroy the light of incandescent lamp, can judge of bidirectional thyristor.
Will any end of the 220 v ac power to T2, the other end with a 220 v, 100 w bulb T1.
Trigger circuit is composed of switch S and door limit flow resistance R.
Small S selection pressure 220 vac toggle switch or pull switch.
R the resistance from 100 ~ 330 Ω, R value obtained is too large, will reduce the conduction Angle.
Below a salt inspection steps: first step, first will disconnect, S bidirectional thyristor turn-off, lamp shall be put out.
If normal light bulb, the bidirectional thyristor T1 -
T2 electrode short circuit, pipe scrap;
T1 - if bulb light shine
T2 leakage current is too large, poor performance of the pipe.
In the above two situations, should stop the test.
The second step: make S, because the gate on the trigger signal, so only a few microseconds, bidirectional thyristor that guide all incandescent lamp with alternating current through the normal light.
The specific working process of the analysis are as follows: in the positive half cycle of alternating current (ac), Ua>
Ub, T2 is positive, T1 is negative, G relative to the T2 is negative, the bidirectional thyristor according to T2 -
The direction of the T1 conduction.
Set in the negative half cycle, of the alternating current (ac) Ua.
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