Basic Thyristor

1. Design and operation principles of Thyristor

Components of Thyristor Thyristor symbol similar dotuong Profile

Thyristor is made up of four compound semiconductor layer to form two transistors connected in series, a forward and a Transistor Transistor reverse (as the equivalent diagram above). Thyristor anode is positive with 3, and Gate called Katot AKG, Diode Controlled Thyristor is normally agreed upon polarization, Thyristor not conduct electricity when a voltage on pin size G => Thyristor lead until reverse voltage or cutting voltage Thyristor last stop guide ..

The following experiment illustrates the operation of the Thyristor

The experiment illustrates the operation of the Thyristor.

• Initially the switch K2 is closed, although the polarization Thyristor upon but still no current flows through the LED is not lit.
• When the switch K1 closed, the voltage level on pin G U1 Q2 to light guide => drag the guide tube Q1 => current from U2 as the light passes through Thyristor.
• Next we see the disconnect switch K1 but light is still on, because the lead Q1, Q2 lamp voltage leg B leading up to Q2, as Q2 leading to pressure tube foot B Q1 Q1 drop, led lights, two lights such bias each other and maintain power transmission status.
• Lights remain off until K2 => Thyristor not stop the power supply and operation status.
• When stopped Thyristor guide, we close the K2 but still bright lights like the original case.

Thyristor shape

Measurement test Thyristor

Measurement test Thyristor

Place the ladder x1 W Lake, located on the anode rod black, red stick needles into Katot original, use the short leg A leg Tovit G => see the clock on the needle, then put Tovit out => still on the clock Metal => Thyristor so good.

Application of Thyristor

Thyristor commonly used in the rectifier circuit of the automatic double pulse source color TV.

Examples of the second rectifier in 1490 JVC color TV source diagram as follows:

Application of Thyristor rectifier circuit of two automatic clock source JVC color TV