Power Electronic Kit
1. PLOT VI CHARACTERSTICS OF IGBT:
This unit mainly consists of an IGBT whose characteristics are to be studied. A variable DC Power supply from 2.5V to 35V @ 500mA using IC regulator for load current. One max variable DC power supply from 1.5V to 15V @ 100mA for gate voltage. A load resistance of 25 watts for load current variation along with this 3 digital meters are provided to measure Vce, Vge and Ic.
2. RECTIFICATION CHARACTERISTICS SCR BY AC / DC GATE CONTROL:
This unit consists of an SCR, 20V @ 0.5V AC Source and DC Source to study the rectification characteristics of SCR.
3. SCR TURN-ON USING UJT RELAXATION OSCILLATOR:
This unit consists of 2N2646UJT based relaxation oscillator to study its characteristics in synchronized and unsynchronized mode. Its application in SCR triggering all the points are brought out on the front panel for study purpose. A 20V @ 0.5A AC source is provided for SCR Turn-On.
4. LIGHT DIMMER CIRCIUT USING DIAC AND TRIAC:
This unit consists of 50V @ 0.5A step down transformer. The TRIAC is provided with fuse and Snubber protection. A DIAC and associated RC components are provided to vary the firing angle. A lamp is also provided.
5. HALF WAVE CONTROLLED AND FULL WAVE CONTROLLED RECTIFIER USING R-C TRIGGERING CIRCUIT:
This unit consists of R-C components, a Thyristor a bridge rectifier and an AC supply of 20V along with associated components to study Half and Full wave controlled rectifier using R and R-C circuit.
6. TRIGGERING OF SCR USING IC 74121:
This unit consists of SCR firing circuit using IC 74121, 20V @ 0.5A AC source and an SCR to study firing using IC 74121.
7. SINGLE PHASE FULL BRIDGE CONVERTOR CIRCUIT USING R – LOAD:
This unit consists of firing circuits based on Ramp comparative method to trigger 4 SCR’s with Pulse transformer isolation. Firing angle variation from 1800 to 00on a graduated scale. Power circuits consists of 4 SCR’s with Fuse and Snubber protection. A 24V / 1A AC Source as input to bridge converter. A 25 watt resistor as R-load.
8. BASIC SERIES INVERTER:
This unit consists of SCR, DIODE, inductor, Firing circuit and associated components to build basic series inverter with 24V @ 1A built in DC supply.
9. VOLTAGE COMMUTATED CHOPPER BOTH CONSTANT & VARIABLE FREQUENCY:
This unit consists of firing circuits based on Timer, RAMP Generator, Comparator, Amplifier / Pulse Transformer isolation method to trigger. 2 SCR’s connected as voltage Commutated Chopper. Frequency variation from 25Hz to 250Hz and Duty cycle variation from 10% to 90%Power circuit consists of 2 SCR’s, 2 Diodes, L-C Commutation components. All the diodes are mounted on proper heating and protected by Snubbed circuit and fuse. All the connections are brought out on the front panel. A 24V / 0.5A DC supply is also provided as DC input source for the chopper. A 25 Watt resistance is also provided for Load.
10. SINGLE PHASE TO SINGLE PHASE CYCLO CONVERTER:
This unit consists of firing circuit which generates 4 Synchronized firing pulses to trigger 4 SCR’s connected in center tap transformer type Cyclometer. Firing angle can be varied from 1800 to 00. Frequency division by 2,3,4,5,6,7,8,9 & 10. Power circuit consists of 4 SCR’s. Each device is mounted on heat sink and protected by Snubbed and fuse. All the points are brought out on the front panel for interconnection. A 24V-0-24V @ 1A center tap transformer is provided for AC input supply. A 25 Watt resistive load is also provided.
11. SPEED CONTROL OF PMDC MOTOR:
This unit consists of controller unit and a 24V PMDC motor. Controller consists of Power MOSFET Chopper. Duty cycle can be varied from 0 to 100% with soft start / soft stop feature. A 24V / 1A fixed DC supply is provided as input to the chopper. A 24V / 1500 RPM / 20 watts permanent magnet DC motor is provided along with this unit.
Optional : Non contact digital Tachometer.
12. SPEED CONTROL OF UNIVERSAL MOTOR:
This unit consists of Controller and 0.5HP AC / DC Universal motor. Controller consists of SCR’s, Diodes and TRIAC to control the speed by AC voltage control and also by DC voltage control by firing angle variation from 1800 to 00with soft start / soft stop feature. Power circuit consists of 2 SCR’s, 3 Diode’s and a Triac. A 230V / 6000rpm / 0.5HP AC / DC universal motor is provided along with the unit. Optional : Tachometer.
13. GENERATION OF PWM SIGNALS USING TL –494/SG3524:
This unit consists of TL –494/SG3524 PWM controller IC. All associated components with DC Power supply are provided to generate PWM signals with variable frequency and variable pulse width.
14. SEQUENCE TIMER USING IC 555:
This unit consists of two 555 IC’s with built in Power supply, associated R-C components to build two stage sequence timer. R-C components are provided to vary the sequence timing.
15. SPEED CONTROL OF STEPPER MOTOR:
This unit is Microcontroller based controller circuit to accurately generate pulses to energize the stepper motor winding in the desired sequence. Power Transistor based driver circuit to drive the stepper motor. 5 Seven segment display to set and display the parameters. From this controller we can set the speed of the stepper motor in RPM, set the number of steps the motor can move. We can set the direction of rotation – forward and reverse direction. We can also set half step and full step mode.