FEPET05 – SCR Single Phase AC Power Control

FEPET05 – SCR Single Phase AC Power Control

FE’s Power Electronics Applications Trainers are meant to demonstrate and help the users learn about applying the power devices in their applications using an intelligent study environment, specially designed for the purpose. This is a stand alone, all inclusive facility with high resolution power sourcing and measuring facilities along with most useful oscilloscope functions. The integrated two channel differential oscilloscope functions are used to view all the important voltages and currents enabling users get a through understanding of the design ideas with ease and convenient. The oscilloscope function makes use of TFT colour LCD, professional encoders and switches. In short, the environment helps the users learn, understand and get insights on the principles on engaging the power devices in their applications.

The application circuitry of the trainers give more design options to the users in an encouraging to facilitate maximum learning in the given time. Also, all the parts of the circuitry are well protected against unintended shorts and mis-wiring to provide a long maintenance-free life in the laboratory.

Functional Description

In the trainer, half wave AC power control is designed using a SCR. The SCR is grounded and the load is connected in a floating configuration enabling direct connection to various triggering circuits. Five types of triggering are available on board: R trigger, RC trigger, UJT trigger, Op-amp trigger and Microcontroller triggering. A resistive and lamp loads are also included in the circuitry.

SCR Single Phase AC Power Control

In-built Two Channel Differential Oscilloscope Function

The trainer comes with a built-in, stand alone, two channel differential oscilloscope functions to help the users view voltage and current waveforms around the application circuitry. The oscilloscope function is based on the colour TFT LCD to display the waveforms and take user inputs with digital encoders just like a professional oscilloscopes. In each of the two channels, any one of these waveforms can be displayed: Vac, Ved, Vak, Vgk, Ve, Vc, Vref and Vop. For each channel, a set of mathematical measurements on the acquired signal is displayed in real time. The possibilities are: Peak-to-Peak, Average, RMS, Maximum and Minimum. All these measurements channels are completely differential, enabling the users to make floating measurements without any difficulty.

Application Circuit

The application circuit contains the following:

AC Power Supply.


Study Device: SCR.

R/RC Trigger.

UJT Trigger.

Op-Amp Trigger.

Microcontroller Trigger.