September 07, 2012

Induction heating simulation

Hello friends this post is about "induction heating" project on which i was working in final year.
                  I have already post about PWM pulses generation and MOSFET triggering with microcontroller which are two important aspects I found out during my final year project.
                  Here is the Pwm scheme which i have used to generate pulses.



pwm pulses mosfet bridge induction heating
Triangular wave and two reference levels



  • First of all I generated a triangular wave (inside microcontroller) this is called Phase correct PWM in AVR microcontroller.




pwm pulses with guard band with microcontroller
Pwm pulses with guard band

  • Then I generated two levels with which I want to compare my triangular wave... which leads to the following type of pulses with guard band.
Gate pulse logic
  •  here is the logic which i used to generate gate pulse.

  • these pulses are then applied to MOSFET as discussed in this post via  opto-couplers to this bridge configuration
inverter bridge circuit
Inverter bridge


  • with inductor and capacitor series resonant circuit as  load I got this current output waveform from the load.
inverter with inductive and capacitive load
Current waveforms of inductor

Questions and suggestions are always welcomed in comment box.......so feel free to comment.

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