Triggering circuit | Power electronics lab report

Abstract

In this experiment we will construct the triggering panel used as control panel for triggering the thyristors and we will construct the single phase half wave controlled rectifier and study the output R,Rl and RC loads.

Introduction and Theory:

The six-pulse control unit is used to trigger Thyristors and IGBTs in controlled rectifier circuits, choppers and inverters.

The control unit is to be connected with a symmetric supply voltage ±15V.

A clockwise rotating field is to be connected to the synchronization input. The circuit itself produces a center point, for this reason, the N- conductor must not be connected.

When the unit is used as a single-phase control unit, the N-conductor should be connected.

The half wave single phase controlled rectifiers is called 'Controlled' because using the Thyristor rather than a diode, the Thyristor has an extra terminal called the Gate, the Thyristor, in addition to the necessary forward bias voltage, needs a pulse at the gate to start conduction, this process is called the firing or triggering of the Thyristor, also firing angle (α) is controlled using the triggering circuit.

Used equipment

1. Thyristor
2. AC power supply
3. Circuit breakers
4. R, RL and RC loads
5. Oscilloscope
6. Digital Multimeter
7. Connecting wires
8. Pulse generator circuit.

Equations:

The output voltage is