Uploaded January 2012 | Updated September 2026, 1 week ago
Hi all
This my first replication of the Rosemary Ainslie circuit as per described on her last paper.
I ordered some of those IRFPE 40 mosfet because they are high voltage and low rds(on), and they are much cheaper than the IRFPG50.
The load is a heating element of the grill part of a Micro wave oven. it is a heating inductor.(rolled resistive wire)
The shunt sensing resistor for measuring the current, are 4 paralleled 0.01 ohm 5 w ceramic resistors.
The circuit works with about all the range of my signal generator and i have to adjust the dutycycle to get an acceptable result.depending of the frequency.
But it seems that the down current surface (wave) increases with frequency.
I have tried the circuit with 12 volt battery and it works too, By working i mean that i can get this "negative current" and the voltage peak, which is higher than the nominal voltage of the supply.
I could heat the resistive element higher than 60 degrees celcius (depending ofdutycycle and frequency)
I am impressed by the fact that there is this very strong negative current wave, and does it show that a great part or almost all the current drawn goes back to the power supply ?
If any explanations ?
Good luck at all
Laurent
PS
I made this experiment with my low material and knowledge, so please don't flame me if error.
If any explanation
Hi all
This my first replication of the Rosemary Ainslie circuit as per described on her last paper.
I ordered some of those IRFPE 40 mosfet because they are high voltage and low rds(on), and they are much cheaper than the IRFPG50.
The load is a heating element of the grill part of a Micro wave oven. it is a heating inductor.(rolled resistive wire)
The shunt sensing resistor for measuring the current, are 4 paralleled 0.01 ohm 5 w ceramic resistors.
The circuit works with about all the range of my signal generator and i have to adjust the dutycycle to get an acceptable result.depending of the frequency.
But it seems that the down current surface (wave) increases with frequency.
I have tried the circuit with 12 volt battery and it works too, By working i mean that i can get this "negative current" and the voltage peak, which is higher than the nominal voltage of the supply.
I could heat the resistive element higher than 60 degrees celcius (depending ofdutycycle and frequency)
I am impressed by the fact that there is this very strong negative current wave, and does it show that a great part or almost all the current drawn goes back to the power supply ?
If any explanations ?
Good luck at all
Laurent
PS
I made this experiment with my low material and knowledge, so please don't flame me if error.
If any explanation
