Thyristor tetrode
The thyristor tetrode is an electronic component with a semiconductor layer structure that can be seen as a variant of the thyristor , but with two control connections.
The Thyristortetrode has next to the anode (A) and the cathode (K) for controlling so two gate terminals connected to G A and G K are referred to.
functionality
One model to explain how the thyristor works is to break it down into two transistors .
When a voltage is applied to the path AK to be switched, both transistors are blocked. If the voltage is now increased in the positive direction at G K compared to G A , so that T 2 is switched on, a current I 1 begins to flow. This current makes the collector-emitter path at T 1 conductive, which keeps T 2 in the conductive state due to the current I 2 . This in turn means that the base current is maintained through T1. The thyristor thus suddenly becomes conductive from a certain gate current. It can be deleted by a brief interruption of the load current, i.e. i.e., to be returned to the initial state. For the shutdown at the gate, a shutdown current is required that is around 20% to 30% of the load current.
Individual evidence
- ↑ Dieter Sautter, Hans Weinerth: Encyclopedia electronics and microelectronics . Springer, 1997, ISBN 3-540-62131-8 , pp. 1058 .