• This equipment should consists of
  A DC Power Supply of 1.5V to 15V/250mA for Gate current/Gate Voltage
  A DC Power Supply of 2.5V to 35V/500mA for load Current.
  A variable load resistance and gate resistance potentiometers which suits the above requirement (Care to be taken so that minimum load
  resistance is present in the load and a short is avoided).
  Meter unit with 4 digital meters consists of DC Ammeters -2Nos; 0-2A& 0-20mA, DC Voltmeters 2 Nos;0-200V& 0-20V
  Rating of Devices:
  SCR : 16A, 600V
  MOSFET : 10A, 400V
  IGBT : 19A, 600V

A) R& RC Triggering of SCR
This unit consists of an SCR, AC Supply of 20V, Resistance
Capacitance and associated components required to study the
 resistance triggering of SCR.
B) Basic DC Firing Circuit
This unit consists of an SCR, DC Source of 10V, AC Source of 10V and
 variable DC source using potentiometer for gate supply to study the
 firing of SCR Using DC Supply.
C) UJT Triggering of SCR
This firing circuit generates two pulse transformers
 isolated trigger pulses to trigger 2 SCR’s/TRIAC
connected in single phase half wave, full wave, half controller converter and AC Phase control using 2SCR’s or using TRIAC.This firing CKT should be useful to study the UJT relaxation Oscillator is synchronous and asynchronous modes.

• This unit consists of 24-0-24V/2A center tapped transformer with
  2SCR’s & 1 TRIAC with firing pulses to trigger 2 SCR’s in anti
  parallel or one TRIAC in single Phase AC Voltage controller configuration.
  Optional equipment

  1. Rheostat -50 ohm/2A-1No
  2. Inductor  -150mH/2A-1No

• A) Single Phase fully control bridge converter power circuit unit(230/5Amps):
  This Unit consists of
  1. 4-SCR’s and freewheeling diode.
  2. All the necessary terminals be brought out on front panel
  3. An MCB,and Fuses provided for input circuit.
  4. A bridge rectifier of 220V/2A DC for field supply

  B) Single Phase bridge converter triggering circuit unit:
  This unit generates 4 pulse transformer isolated trigger pulses to trigger
  SCR’s. Test points should be provided to study the logic circuit and firing
   angle variation from 180-degree to 0-degree on a graduated scale. Soft start
   feature may be provided.
  Optional equipment

  1. Rheostat -150 ohm/5A-1No
  2. Inductor-150mH/5A-1No

  Isolation transformer-1KVA 1:1 50Hz, 230V with tapings

• (Class A, Class B, Class C, Class D, Class E)
  This unit consists of two SCR’s, Two diodes and different values of
   communication components. These components can be interconnected
   to form power circuit to study.
  1. Self communication by load resonance(Class A)
  2. Self-Communication using L-C Circuit(Class B)
  3. Complimentary SCR Communication(Class C)
  4. Auxiliary Communication(Class-D)
  5. External Communication(Class-E)

  Firing circuit for the above circuit should have frequency variation and duty cycle. The unit should come with built in DC unregulated power supply of 24@1A.
  Optional equipment 

  • Rheostat-50 Ohm/2A-2Nos

• A) Jones Chopper Power Circuit:
  This unit consists of 2 SCR’s, 2 diodes and tightly coupled commutating center tap
   inductor interconnected to form Jones chopper power circuit. All the devices are
   mounted on a suitable heat sink and protected by snubber circuit, fuse. All the
  connections are brought out to front panel. DC Chopper Firing Circuit should be
  Provided to trigger the SCR’s in this power circuit.
  1. SCR Ratings: 16A/600V
  2. Diode Ratings:16A/800V

  B) DC Chopper Firing Circuit:
  This Unit generates firing pulses to trigger 2SCR’s connected in Auxiliary commutated Chopper circuit should consists of 1 Main SCR and 1 Auxiliary SCR .They should be based  on timer, Ramp generator, OP-Amp, Comparator, and pulse transformer isolation method, works directly on 230V AC mains, Frequency and duty cycle variation. Test points to study the logic circuit.
  Optional equipment

  1. Rheostat -50 Ohm/2A-1No
  2. 150mH/2A Inductor With tapings-1No
  3. Regulated Power Supply 0-30V/2A (Single Output).

• Parallel Inverter Center tap transformer type:30V/2A
  This unit consists of
  1. 2-SCR’s, 2-Didoe & Commutation circuit. SCR and Diode

   mounted on suitable heat sink with protection circuit.

  1.  A Centre  tap transformer.
  2. All the necessary terminals should be brought out on front panel.
  3. A built in triggering circuit for frequency variation for 100Hz to 500Hz

  The Required  Accessories are:

  • Rheostat -50 Ohm/2A-1No
  • 150mH/2A Inductor With tapings-1No
  • Regulated Power Supply 0-30V/2A (Single Output).

• A) Single phase cyclo converter power circuit (230V/5A):
  This Unit consists of 4 SCR’s to be interconnected in center – tapped
  transformer type to form cyclo converter power circuit.
  Each device should be mounted on a suitable heat sink protected by a
  snubber circuit, fuse and circuit breaker.
  A digital Voltmeter and an ammeter for measurment of output voltage
   and current are to be provided. All the connections are to be brought
  to the front panel. This unit should also be useful for R and RL Loads.
  1. Single Phase  cyclo converter firing unit:

  This Unit generates 4 synchronized firing pulses based on Micro controller to trigger SCR’s connected in center-tapped transformer type cyclo converter.
  Features:-
  Work on 230 AC mains, 200mA gate drive current to trigger wide range of devices. Frequency division - 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. firing angle variation from 180 degree to 0 degree, on a graduated scale. Test points provided in the logic circuit.
  Optional equipment

  • Rheostat -150 Ohm/5A-1No
  • Inductor-150mH/5A-1No with tapings
  • Center tapped isolation transformer -5A,50Hz,230-0-230V SCR Ratings 16A/600

• 1. Single phase half control bridge converter power circuit unit (230V/5A):

  This Unit consists of

  1. 2-SCR ‘s and 2-diodes and a freewheeling diode(SCR and diodes be

  mounted on heat sink with protection Circuits)

  1. All the necessary terminals should be brought out on front panel
  2. A MCB, fuse to be provided for Input circuit.
  3. A Digital Ammeter and voltmeter to measure output current and

   voltage.

  1. A Bridge rectifier of 220V/2A DC for field supply.
  2. Single Phase Bridge converter triggering circuit unit:

  This unit generates 4 pulse transformer isolated trigger pulses to trigger SCR’s, Test points are to be provided to study the logic circuit, firing  angle vary from 180-degree to  0-Degree on a graduated scale. Soft start and stop feature.
  Optional equipment

  • Rheostat -150ohms/5A -1No
  • Isolation transformer 1KVA 1:1, 50Hz, 230V with tapings.

This setup consists of:
1. Three Phase converter firing circuit based on Ramp-comparator method:

This unit generates  6Nos of three phase synchronized isolated trigger pulses to fire SCR’s connected in three phase half wave, half controlled bridge, fully controller bridge and AC
 phase control power circuit. The firing circuit is based on ZCD, Ramp
generator, Op-amp, comparator, Amplifier/Pulse transformer isolation
method.

1. Three Phase Half controlled converter power circuit:-
2. Three SCR’s (25TTS12) rated for 1200V/16A and three diodes

with heat sink, snubber and fuse.

1. One free Wheeling diode.
2. Two digital meters to measure Output voltage and current.
3. This unit is enclosed in powder coated MS box with screen printed front panel PVC striker.

Optional equipment

• R-Load   : 600V/5A loading Rheostat
• L-Load   : 0-15mH/5A with tapings
• 0-440V/5A Three phase isolation transformer with tapings.

• Series inverter -30/2A:
  Firing circuit to vary the frequency from 50Hz to 250Hz and pulse
  transformer isolation circuit for trigger O/P’s and power circuit
  consists of 2SCRs, 2 diodes and LC commutation components
   interconnected to form modified series inverter. All the devices
   are mounted on suitable heat sink and protected by snubber circuit
  and fuse. All the terminals are brought out on the front panel.
  Optional equipment
  1. Rheostat:50 Ohms/2Amps-1No
  2. L-load    :0-50-100-250mH/2A

  DC Regulated Power Supply: 30V/2A (Single output)

• 1. 1-Phase Mc Murry bridge inverter with firing circuit 30V/2A:

  Bridge inverter firing circuit generates 8 isolated trigger outputs to trigger 8 SCR’s connected in 1-Phase MC murry bridge inverter.
  Potentiometer to vary the frequency from 50Hz to 250Hz with test points and power circuit consists of 8 SCRs, 4 diodes and LC commutation components interconnected to form 1-Ph Mc Murry bridge inverter. All the devices are mounted on suitable heat sink and protected by snubber circuit and fuse. All the terminals are brought out on the front panel

  1. Single Phase Bridge Mc Murry Bedford Inverter 30V/2A:

  Bridge inverter firing circuit generates 4 isolated trigger outputs to trigger 8 SCR’s connected in
  1-Ph Mc Murry bridge inverter.
  Potentiometer to vary the frequency from 50Hz to 250Hz with test points and power circuit consists of 4 SCRs, 4 diodes and LC commutation components interconnected to form 1-Ph Mc Bedford inverter. All the devices are brought out on the front panel.

  1. Single Phase Parallel bridge Inverter with firing circuit 30V/2A:

  Bridge inverter firing circuit generates 4 isolated trigger output to trigger 8 SCR’s connected in 1-Ph Parallel Bridge inverter.
  Potentiometer to vary the frequency from 50Hz to 250Hz with test points and power circuit consists of  4 SCRs, 4 diodes and LC commutation components interconnected to form 1-Ph parallel bridge inverter. All the devices are mounted on suitable heat sink and protected by snubber circuit and fuse. All the terminals are brought out on the front panel.
  Optional equipment

  • R-Load            : 50Ohms/2A Rheostat
  • L-Load                        : 0-50-100-250 mH/2A
  • Regulated power supply: 0-30V/2A(Single Output)

• 1. Single Phase dual converter power circuit (220V/5A):

  This unit consists of 4 SCR’s in P-converter and 4 SCR’s N-Converter.
   Each device should be mounted on a suitable heat sink and protected
  by snubber circuit, fuse and circuit breaker. Voltmeter and Ammeter
  for measurement of output voltage and current are to be provided. All
   the connections are brought out on to the front panel.

  1. Single Phase Dual Converter Firing Unit:

  This unit is micro controller based with LCD display with keys to
  increment and decrement the firing angle with resolution of 1 degree to generate 8 synchronized firing pulses to trigger 4 SCR’s in P-Converter and 4SCR’s in N-Converter in non-circulatory current mode dual converter as well for circulatory current mode dual converter
  Features:
  Work on 230 AC mains, 200mA, Gate drive current to trigger wide range of devices. Firing angle variations from 180 to 0 degree with LCD display.
  Optional equipment

  1. Rheostat           : 150ohm/5A-1No
  2. Inductor           : 150mH/5A-1No with tapings.
  3. Isolation Transformers: 1KVA 1:1, 50Hz, 230V with tapings.
  4. Circulatory current limiting inductor: 100mH-0-100mH/5A
  5. Ratings of SCR: 16A/1200V

  Diode Ratings  : 16A/1200V