 PC Psu series tank Heater problems
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Davebmx
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Wed Feb 08 2012, 09:57AM
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Registered Member #4394
Joined: Mon Feb 06 2012, 07:43PM
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Posts: 40
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Hi everyone I have built a very simple induction heater according to Dinges specification in an attempt to better understand induction heating and simple electronics. I built a Variac and connected it to a 230w fan cooled psu that uses the tl494 chip. I then replaced the frequency modulation resistor with a 200k pot. I also soldered some leads to the chip to allow it to be powered by a 12v gel cell. I have connected the 12v leads to a small motor and can get it to turn with an input of 30v from the variac and with positioning the pot at about 80% throw (so 160k ish?). When i connect my series tank circuit using 13 0.15uF/440Vac Capacitors and a work coil consisting of 5 turns of 5mm copper brakline. I have however wound the work coil internally to create a bore heater arrangment. However i am unsure about how to go about getting the heater to heat anything now. What should I test first? Should I solely connect a wound toroid and see if it creates an inductance field first? How should I increase voltage compared to the frequency of the pot? If anyone can see any glaring failures in my set up I would be very grateful for the assistance! Also at around 30v (the voltage and frequency arrangement thjat makes the motor turn) I can hear a whining from the power supply that changes pitch with input from the pot but it dissapears above 30v. Is this normal? Also I have bothe powdered and ferrite toroids.
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