TRIGGERING CIRCUIT FOR SINGLE PHASE CONVERTER

This unit generates four line synchronized isolated triggering pulse to fire thyristors connected in single phase (1) Half wave, (2) Full wave, (3) Half controlled Bridge, (4) Fully controlled Bridge and (5) AC phase control power circuit.The firing circuit is based on Ramp-comparator method. Isolation is provided by pulse Transformer.

FEATURES :

1. Works directly on 230V AC mains.
2. Gate drive current of 200mA to trigger wide range of devices. Provision for feed back control.
3. Firing angle variation from 180 to 0 on a graduated scale.
4. Test points to study the logic circuit.
5. Soft start and soft stop feature.
6. Neatly designed front panel.

This unit along with our SCR converter modules, Rectifier diode modules, Single phase half controlled converter power circuit and single phase fully controlled converter power circuit can be used to conduct Power Electronics Experiments on single phase.

FRONT PANEL DETAILS :

1. POWER : Mains on/off Switch with built in LED Indicator
2. FIRING ANGLE: Potentiometer to very the firing angle from 180 to 0 when the control switch is in INT position.
3. CONTROL: Switch for internal (INT) or external / feedback (EXT) control
4. Vc: External control input when the control switch is in EXT Position. 0 to 5V.
5. GND: Equipment ground for connecting external control input and to observe the test point signals.
6. ON/OFF: Switch for trigger output with soft start and soft stop feature.
7. TEST POINTS: To observe the signals at various points in the logic circuit for study purpose.
8. TRIGGER OUTPUTS:
   T1 & T1 For +ve Half Cycle.
   T2 & T2 For -ve Half Cycle.