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Applications of digital platforms/controllers in power electronic/electronic apparatus

B_E_Top

Arnab Dey

B.E., Electrical Engineering, 2009-13

Bengal Engineering and Science University (BESU), Shibpur, Howrah

Advisor : Prof. Mainak Sengupta

Aim :

  • In-house development of low cost digital oscilloscope, function generator and digital voltmeter

  • Implementation of digital hysteresis current controller for motor drive

Implementation :

  • PIC18F452 was chosen for its low cost, easy availability and speed.

  • In-built ADC was utilized and DAC circuit was external

Digital Current Controller

  • Developed algorithm for hysteresis current controller for an SRM motor drive

  • Implemented controller code on PIC18F452

Current_Control.png
Current_Control_waveform.png

Current controller experimental setup

Ch 1: Control signal 

Ch 2: Motor current in eqv. voltage

Function Generator

  • Interfaced keyboard to select function type i.e. sine, square, saw tooth etc.

  • Look-up table based waveform generation

Function_gen.png

Prototype simulation on Proteus

Sawtooth.png

Generated sample waveform

Digital Oscilloscope

  • Graphical LCD was used to show the waveform

  • Developed algorithm to actually convert analog waveform to equivalent graphical LCD representation

Osc_sim.png

Prototype simulation on Proteus

Oscilloscope.png

Simulation Circuit Diagram

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