Basic: Thyristor

1. Design and principle of operation of the Thyristor

Components of Thyristor Thyristor symbol relative dotuong Profile

Thyristor is made up of four layers of semiconductor composite made up of two transistors in series, a forward and a Transistor Transistor backwards (as the equivalent diagram above). Thyristor anode is positive with 3, Katot and Gate called AKG, a Diode Thyristor controlled, normal polarity is convenient, Thyristor not conductive when a voltage stimulus to the foot G => Thyristor lead until reverse voltage or voltage cut new Thyristor stop guide ..

The following experiments illustrate the operation of the Thyristor

The experiment illustrates the operation of the Thyristor.

• Initially the switch K2 is closed, although the polarization Thyristor agreement but no current flows through the LED does not light.
• When the switch K1 is closed, the voltage level on pin G U1 as leading lights = Q2> Q1 pulling light guide => current from passing through Thyristor U2 to light.
• Next we see the disconnect switch K1 but still bright lights, because the Q1 result, the voltage increases to pin B Q2 Q2 led lights, led to pressure to leg B Q2 Q1 lights down as Q1 led lights, so the two lights of heaven each other and maintain the status conductivity.
• Lights remain off until K2 => Thyristor not stop the power supply and operating status.
• Thyristor stopped leading when we close the K2 but not bright light as the original case.

Shape Thyristor

Measure test Thyristor

Measure test Thyristor

Set the clock scale x1 W , located on the anode rod black, red stick needles into Katot original, use the short leg A leg Tovit G => clock to find the needle, then remove Tovit out => clock is still on Metal => so Thyristor t

Application of Thyristor

Thyristor commonly used in the rectifier automatically doubles the clock source color TV.

For example, rectifier power of 2 in 1490 JVC color TV with the following diagram:

Application of Thyristor rectifier in 2 of the clock source automatically JVC color TV