A. POWER ELECTRONICS TRAINERS FOR POLYTECHNICS

1. SINGLE PHASE HALF-CONTROLLED CONVERTER (VPET -204).               [TOC]

• Consists of scr firing circuit ,half-controlled scr power circuit and R-L load.

• TCA-785 IC based firing pulse generation.

• One number potentiometer provided for firing angle adjustment (0-180d).

• 230/9v synchronization transformer provided for firing circuit.

• Carrier logic implemented for pulse with on/off switch.

• Pulse transformer used for gate pulse isolation.

• All pulses are terminated in the pcb for scr patching

• Two no. TYN-612 scr and power diode used for power circuit.

• Necessary test points provided for waveform measurement.

• 24v ac ,2amp provided for power circuit input with on/off switch. 

2. SINGLE PHASE FULLY CONTROLLED CONVERTER (VPET-205)               [TOC]

• Consists of scr firing circuit ,fully-controlled scr power circuit and R-L load.

• TCA-785 ic based firing pulse generation.

• One number potentiometer provided for firing angle adjustment (0-180d).

• 230/9v synchronization transformer provided for firing circuit.

• Carrier logic implemented for pulse with on/off switch.

• Pulse transformer used for gate pulse isolation.

• All pulses are terminated in the PCB for scr patching.

• Four No. TYN-612 scr with heatsink provided for power circuit.

• Necessary test points provided for waveform measurement.

• 24v ac ,2amp provided for power circuit input with on/off switch.

4. THREE PHASE HALF CONTROLLED CONVERTER [VPET-215A]                    [TOC]

• Consists of SCR power circuit, Firing circuit

• 3 Nos. of SCR, TYN612 with heat sink & snubber circuit, 3 Nos. of Power diode.

• TCA785 based 3 phase firing pulse generator

• One Pot used to vary firing angle (180°-0°)

• 3 Nos. 1:1 pulse transformer used to isolate the gate pulses.

• Gate carrier logic input provided

• One no. SPDT used for PWM ON/OFF

• Low voltage step - down transformer for power circuit input.
  #Input : 230,230,230V
  #Output : 24,24,24V, 3A

• Fixed R, L Load 

5. RAMP&PEDESTAL TRIGGER CIRCUIT FOR AC LOAD (VPET-203)                [TOC]

• Consists of BTA12 triac based ac regulator for lamp intensity control.

• Tca785 ic based firing pulse generation to trigger triac

• One number of potentiometer used ac variable R-

• One number of potentiometer provided for firing angle adjustment.(0-180d)

• pulse transformer provided for gate pulse isolation 230v on/off.

• pulse output terminated in the pcb with on/off switch.

• Necessary test points provided for firing circuit waveform measurement.

• 230v ac input for power circuit with on/off switch, fuse protection.

• One number of 230v lamp provided for load.

• One number 230/9v step-down transformer provided for output waveform measurement in cro.

• All are mounted in the pcb fixed with wooden cabinets.

• Consists of SCR power circuit, Firing circuit

• 6 Nos. of SCR, TYN612 with heat sink & snubber circuit

• TCA785 based 3 phase firing pulse generator

• One Pot used to vary firing angle (180°-0°)

• 6 Nos. 1:1 pulse transformer used to isolate the gate pulses.

• Gate carrier logic input provided

• One no. SPDT used for PWM ON/OFF

• Low voltage step - down transformer for power circuit input.
  #Input : 230,230,230V
  #Output : 24,24,24V, 3A

• Fixed R, L Load 

• Experiment :
  #Testing of 3 phase AC Voltage regulator using R, RL Load.

• Consists of single quadrant chopper control circuit, mosfet power circuit & load.

• TL494 pwm controller ic based pwm generation for mosfet chopper.

• One number of potentiometer provided for pwm frequency adjustment.

• One number of potentiometer provided for pwm duty cycle adjustment.

• High-speed opto provided for pwm isolation.

• IR2110 driver ic used for pwm driving.

• IRF840 mosfet used for power circuit.

• 24vdc,2amp provided for chopper power circuit input.

• One number on/off switch with indication provided for dc voltage.

• 230v ac input,+15vdc for control circuit.

• Necessary test points provided, all components are mounted in the pcb fixed with wooden cabinet.

• Consists of ujt firing circuit, scr power circuit & load.

• 2n2646 ujt based firing pulse generation.

• 230/24vac provided for ujt firing circuit input and also line synchronization.

• 1:1 pulse transformer used for gate pulse isolation.

• One number of potentiometer used for firing angle adjustment.(10-170d).

• Pulse output terminated at connector in the pcb for scr patching.

• One number Tyn612 scr with heat-sink, fixed load resistor forms half-wave controlled converter power circuit.

• 24v ac,2amp provided for power circuit input with on/off switch.

• Fuse provided for protection.

• Consists of triac based ac regulator for lamp intensity control.

• Diac, r & c used for triac firing pulse variation.

• One number of potentiometer used ac variable R-for firing angle variation.

• 230v ac input for power circuit.

• One number of illuminated switch provided for 230v on/off.

• Fuse provided for input side to avoid overload.

• One number of 230v lamp provided for load.

• One number 230/9v step-down transformer provided for output waveform measurement in cro.

• All are mounted in the pcb fixed with wooden cabinets.

• Consists of scr firing circuit ,scr inverter power circuit, output L-C filter.

• IC based firing pulse generation to trigger two scrs.

• One number of potentiometer provided for firing pulse frequency variation(300-600hz).

• Pulse transformer used for gate pulse isolation.

• Pulse output terminated at connector in the pcb for scr patching.

• Two number of TYN612 scr, inductor, capacitor forms basic series inverter power circuit.

• 24v dc,2amp provided for series inverter power circuit input.

• One number of toggle switch provided for dc on/off with indication.

• Necessary test points provided for varies sections for waveform measurement.

• 230v ac input,+15vdc for control circuit input.

• All components are mounted in the pcb fixed with wooden cabinet

• Consists of cycloconverter firing circuit , scr power circuit, load.

• Ic based firing pulse generation to trigger four scr.

• One number of potentiometer provided for firing angle variation(0-180d).

• Two number of toggle switch provided to select output frequency 50hz, 50/2, 50/3, 50/4hz etc.

• Pulse transformer provided for gate pulse isolation.

• All four pulses terminated in connector for scr patching.

• Four number of TYN612 scr with heat sink and center tapped inductor provided for power circuit.

• 24-0-24vac,2amp provided for power circuit input.

• One number of fixed resistor provided for load.

• One number of toggle switch provided for ac on/off.

• Necessary test points provided for waveform measurement.

• 230vac input,+15/-15vdc for control circuit.

12. DC MOTOR SPEED CONTROL TRAINER [VPET-211]                                     [TOC]

• One no. of Phase control IC used for pulse generator

• One no.of potentiometer used to vary firing the firing angle (0-180°)

• Pulse amplifier and pulse isolation provided

• 2 Nos. of 1:1 pulse transformer used for pulse isolation

• Necessary test points and SCR input and output connectors are provided for easy studying and patching

• All are mounted on a wooden box

Armature Circuit :  

• 4 Nos. of SCR with heat sink form fully controlled converter

• 230V AC input

• One no. of SPDT to ON/OFF power circuit input voltage

• One no. of fuse provided for output section

• All G,K terminals brought out by special connectors

• Connector output terminated by banana socket for Motor Armature.

Field Circuit

• One no. 1φ diode bridge rectifier (Package) provided

• 230V AC Input for diode rectifier

• One no. of ON/OFF switch for AC Input

• Bridge output terminated by connector for motor field.

• One no. of LED Indicate field voltage status

• One no. of Phase control IC used for pulse generator

• One no.of potentiometer used to vary firing the firing angle (0-180°)

• Pulse amplifier and pulse isolation provided

• 1 No. of 1:1 pulse transformer used for pulse isolation

• TRIAC used as power device

• 230V AC used for power circuit input

• Necessary test points and SCR input and output connectors are provided for easy studying and patching

• One no. of SPDT provided to ON/OFF AC Input

• One no. LED indicate the input AC Status.

• All are mounted on a wooden box

• Universal motor as load

14. CLOSED LOOP CONTROL OF FHP AC INDUCTION MOTOR [VPET-213]        [TOC]

• One no. of Phase control IC used for pulse generator

• One no.of potentiometer used to vary firing the firing angle (0-180°)

• Pulse amplifier and pulse isolation provided

• 2 Nos. of 1:1 pulse transformer used for pulse isolation

• 2 Nos. of SCR used as power device

• 230V AC used for power circuit input

• Necessary test points and SCR input and output connectors are provided. 

• All are mounted on a wooden box

• One Analog PI controller for closed loop operation

• One FHP AC Induction motor without loading arrangement (Make : Panasonic) with tacho feedback arrangement.

• One no. of fuse provided for output section for output current protection

• One no. of SPDT Provided to ON/OFF AC input

• One no. Digital speed indicator provided to indicate set/actual speed of the motor.

15. DC MOTOR SPEED CONTROL TRAINER (CLOSED LOOP) [VPET-214]            [TOC]

Ramp and Pedestal Trigger circuit :

• One no. of Phase control IC used for pulse generator

• One no.of potentiometer used to vary firing the firing angle (0-180°)

• Pulse amplifier and pulse isolation provided

• Nos. of 1:1 pulse transformer used for pulse isolation

• Necessary test points and SCR input and output connectors are provided for easy studying and patching

• All are mounted on a wooden box

Power Devices circuit

• Four nos of SCRs rated for 1200 volts- VAK & 25 Amps 1A

• One diode for free wheeling 

• Each device is provided with 
  #RC Snubber for dv/dt protection

• Necessary terminals are terminated on connectors 

• 24volt AC @ 2Amp provided for low voltage operation 

• In the low voltage operation the student can see the waveform using an Oscilloscope without any Isolation Transformer

• One no. of fuse provided at output section for over current part.

• One no. of SPDT to ON/OFF power circuit AC Input

• One no. of Digital speed indicator indicate set/actual speed of motor.

ANALOG PI CONTROLLER

• One analog PI Controller provided for closed loop operation

LOAD

• 24V PMDC Motor

• Make : Panasonic with output feedback facility.