3 Phase Half/Full Controlled Bridge Converter/Rectifier

Features:

The board consists of following built-in parts:

UJT relaxation oscillator and triggering pulse generator with resistance ramp control
Three numbers of pulse transformers each 1:1:1 type
Mains transformer having outputs 0-12V at 100 mA, 0-12V at 100 mA & 0-32V at 500 mA
Two SCRs connected in pulse amplifier and extender configuration and used as auxiliary SCR for triggering main SCRs underreactive load
Two SCRs and two diodes connected in half-controlled bridge configuration
Four SCRs connected in full wave bridge configuration
Resistive, Inductive and Capacitive load which can be used individually or in combinations
Mains ON/OFF switch, Fuse and Jewel light
The unit is operative on 230V ±10% at 50Hz A.C. Mains
Weight : 3 Kg. (Approx.)
Dimension : W 340 x H 110 x D 210

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Object:

Study of SCR triggering in half controlled bridge under reactive loads-limitations of simple UJT triggering circuits
Study of SCR triggering in half controlled bridge under reactive loads using auxiliary SCR triggering circuit with extended pulse technique
Study of half controlled bridge and action of free wheeling diode
Study of fully controlled full wave 4-SCR bridge operation under converter mode