how to detect the transient voltage suppression diode?
how to detect the transient voltage suppression diode?
using a multimeter RX 10kilo-ohm for a monopole type TVS,the positive and reverse resistors can be measured by measuring ordinary diodes.The general positive resistance is about thousands of Europe and the reverse resistance is infinity.If the positive and reverse resistors are zero or infinity,the tube has been damaged.For bipolar TVS,the resistance values between the two pins should be infinite when replacing the red and black pens.Otherwise,it indicates that the pipe is defective or damaged.It should be noted that this method is incapable of judging the internal pole breaking or open circuit faults of pipes.
measuring reverse breakdown voltage VB and maximum reverse leakage current IR figure shows transient voltage suppressor diode test circuit.The adjustable power supply can be provided with the MEG table to provide the test voltage.The voltmeter is a DC 500V voltage block,and the ammeter is a DC mA current block.During the test,the mega ohmmeter is swinging to observe the reading of the meter.The indication is the reverse breakdown voltage VB.
the indication of the table is the reverse leakage current IR.
what is a two-way trigger diode?
Bidirectional trigger diodes are also called end - to - end AC devices (DIAO),which have the advantages of simple structure and low price.A variety of control circuits can be built in conjunction with bidirectional thyristors.
The equivalent circuit and volt ampere characteristic of the bidirectional trigger diode's structure circuit are shown in Figure.
The bidirectional trigger diode belongs to the three layer two end semiconductor device. When the voltage V at both ends of the device is less than the forward turning voltage V, the tube is in a high resistance state,and the negative resistance zone is entered when V>VBo. In the same way,when V exceeds the reverse turn.When the voltage is VBR, the tube can also enter the negative resistance zone.The symmetry of the turning voltage is expressed by delta VB,Delta VB=VBo a 1VBRI.The general requirement is delta Vp<2V.The voltage withstand value (VBo) of bidirectional trigger diodes can be roughly divided into three grades: 20~ 60V, 100~ 150V, 200~ 250V.