Single Phase Bridge Firing Circuit

Specification

• Basic static characteristics study trainer. • LM723 based variable DC power supply (0-30V) for SCR Vak. • LM723 based variable DC power supply (0-12V) for gate voltage of all devices. • Separate section for SCR/TRIAC characteristics. • Separate section for IGBT/MOSFET characteristics. • Two nos. fixed load resistor for all devices. • Four nos. potentiometer to vary all voltages. • LED indication for all power supply. • Three nos. digital multimeter for measurement of device parameters. • For Diac external power supply to the provided.

Specification

• Consists of firing circuit, SCR power circuit and load. • Line synchronized IC based linear firing circuit. • Line synchronization achieved by step - down transformer. • Four nos. firing pulse with pulse transformer isolation to trigger four SCR. • One no. potentiometer used to vary the firing angle (180° - 0°). • Carrier logic implemented with carrier frequency of 4KHz. • One no. toggle switch with debounceogic for pulse ON/OFF. • EPROM Based firing pulse frequency variation. • Two nos. toggle switch to select different frequency (Hz, 50/2Hz, 50/3Hz, 50/4Hz). • Power circuit consists of Four nos. SCR with fuse protection. • Anode, Cathode, Gate terminals are terminated in the front panel for user connection. • 24V AC, 1Amp Provided for power circuit input with ON/OFF switch. • One no. fixed R, load provided Center tapped inductor for power circuit. • 230V, 50Hz AC input with ON/OFF rocker switch, fuse for over load.