Temperature controlled thyristor performance test

　　Performance Testing

　　The internal structure of temperature-controlled thyristors is similar to that of ordinary thyristors, so the electrodes of temperature-controlled thyristors can also be found by the method of identifying the electrodes of ordinary thyristors. The quality of temperature-controlled thyristors can also be roughly measured with a multimeter. The specific method can refer to the detection method of ordinary thyristors.

　　Figure 1 is the test circuit of the temperature-controlled thyristor. In the circuit, R is a shunt resistor, which is used to set the switching temperature of the thyristor VT. The smaller its resistance, the higher the setting value of the switching temperature. C is an anti-interference capacitor, which can prevent the thyristor VT from being triggered by mistake. HL is a 6.3 V indicator light (a small electric bead), and S is a power switch. After turning on the power switch S, the thyristor VT is not turned on, and the indicator light HL is not on. Use the "hot air gear" of a hair dryer to heat the thyristor VT. When its temperature reaches the set temperature value, the indicator light is on, indicating that the thyristor VT has been triggered to turn on. If the thyristor VT is cooled down to a certain temperature value by using the "cold air" gear of a hair dryer (or wait for it to cool naturally), the indicator light can go out, indicating that the performance of the thyristor is good. If the indicator light comes on immediately after the power switch is turned on, or the indicator light does not come on after the thyristor is heated, or the indicator light does not go out after the thyristor is cooled down, then the thyristor under test is damaged by breakdown or has poor performance.

Figure 1 Detection circuit diagram of temperature-controlled thyristor