Description
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Single Phase Cyclo Converter
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.
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Single Phase Bridge Firing Circuit
Specification
• Line synchronized IC based linear firing circuit for SCR applications. • Line synchronization achieved by 230 / 9V step down transformer. • Four nos. firing pulses to trigger four SCRs. • 1:1:1 Pulse transformer used for gate pulse isolation. • One no. potentiometer used to vary the firing angle (180° - 0°). • All four pulses terminated on the front panel for external SCR device module interface. • Carrier logic circuit implemented for SCR self start, carrier frequency 4KHz. • Debounce logic circuit implemented for SCR gate pulse ON/OFF. • One no. toggle switch for gate pulse ON/OFF. • 230V, 5Hz AC input, fuse provided for over load protection. • One no. ON/OFF switch with LED indication for power ON/OFF. • Provision to control the firing angle through external 0 to 5V DC.
SCR Characteristics Trainer
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.
Three Phase Cyclo Converter
This module is designed for three phase half wave-step down cycloconverter. It consists of 18 Synchronized firing pulses, 18 SCRs, Relevant power supply and circuitry for frequency divisions.
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