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Detection of thyristor

In Electronic Infomation Category: D | on April 19,2011

SCR (SCR) International generic name for ThyyiSToy, the Chinese referred to as the thyristor. It at high voltage, high current conditions of work, with pressure, high-capacity, small size and TPS54331DR datasheet and so on.

It is high power switching semiconductor devices, widely used in electrical, electronic circuits.

1. SCR characteristics.

SCR SCR sub-way, bi-directional SCR. A one-way thyristor anode A, cathode K, control three leads to a very G feet. A first triac anode A1 (T1), second anode A2 (T2), control three leads to a very G feet.

Only when the one-way thyristor anode A and TPS54331DR price and cathode K are in between the forward voltage, while controlling the pole between G and TPS54331DR suppliers and the cathode with a positive trigger voltage required, be triggered to conduct. At this point A, K showed a low resistance conduction state between the anode voltage drop between A and cathode K of about 1V. One-way thyristor conduction, the controller G even if the loss trigger voltage, as long as between the anode A and cathode K remains positive voltage, one-way continue to be low resistance silicon conduction state. A voltage is removed only the anode or anode A, cathode voltage polarity change between K (AC zero), the one-way only by the low-resistivity silicon conduction cut-off state to high impedance state. Once the cut-off thyristor way, even between the anode A and cathode K again with a positive voltage, still in control of most G and K between the cathode with a positive trigger voltage before re-conduction. One-way turn-on and cut-off thyristor switch is closed and the state is equivalent to a disconnected state, it can be made with non-contact switch.

Triac first anode A1 and A2 between the second anode, regardless of the applied voltage polarity is positive or negative, as long as the control pole and the first anode A1 G plus a polarity between the different trigger voltage, showed a low resistance can be triggered on-state. At this point A1, A2 between the pressure drop of about 1V. Once the triac turns on, even if the loss trigger voltage, it can continue to maintain the conduction state. Only when the first anode A1, A2 the second anode current decreases, less to maintain current or A1, A2, and between when the voltage polarity change does not trigger the voltage, the triac was cut off, then re-add the trigger voltage side only permeable.

2. Unidirectional SCR detection.

Multimeter resistance R * 1 election gear, with red and black two tables document any two pins were measured resistance between positive and negative reading for the tens of ohms up to find a pair of pins, pin-point black pen for the control of the table pole G, the red pen to the cathode pin K, the other foot as the anode space A. At this point the black table pen then have to determine the anode A, then the red pen is still the cathode K. Meter pointer should not move at this time. Moments with short-term shorting and control the anode A very G, then multimeter power block pointer should be deflected to the right, the resistance reading of 10 ohms or so. A connection, such as the black pen anode and cathode K then the red pen, meter pointer deflected, indicating breakdown of the one-way thyristor is damaged.

3. TRIAC testing.

R * 1 resistor with a multimeter block, with red and black two tables pen were measured between any two pins to the positive and negative resistance, the result of which two groups of reading is infinite. If a group of a few tens of ohms, the group of red, black two-pin connection table for the first anode A1 and control highly G, the other foot space is the second anode A2. Determine A1, G pole, and then carefully measure the A1, G pole between forward and reverse resistance readings that measure the relatively small black table pen the first anode connected to pin A1, take the red pen of the pin CONTROL G. The black table pen then identified the second anode A2, take the red pen first anode A1, then the pointer should not deflect the multimeter, the resistance is infinite. Then a short connection to A2, G shorted very moment, to the G pole with positive trigger voltage, A2, A1 resistance about 10 ohms or so between. Then disconnect the A2, G between the short wiring, meter reading should be kept around 10 ohms. Swap red and black table pen wiring, the red pen then the second anode A2, the first black table pen then anode A1. Meter pointer should not occur the same deflection, the resistance is infinite. Use short wires to A2, G very moment between the shorted again, to the G pole with a negative trigger voltage, A1, A2 is 10 ohms of resistance between the left and right. Then disconnect the A2, G a very short connection between the multimeter reading should be the same, to maintain about 10 ohms. Comply with these laws, that does not damage the triac and measured three pins to determine the correct polarity. Detection of high power SCR

, the need to meter a black pen 1.5V batteries in series to increase the trigger voltage.

Thyristor (SCR) of the pin identification

Identification pin thyristor available following methods: first with a multimeter R * 1K block measuring the resistance between the three legs, small feet, respectively, resistance to control pole and the cathode, the anode is left foot . Then put R * 10K Multimeter block, with your fingers and hold the anode and the other foot, and do not let feet touch the table pen then black anodized, the red pen then the rest of the foot, such as table needle swing to the right, indicating that the red pen The connection to the cathode, compared to control non-swing pole.

4 Summary

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