Hello everyone..
I wanted to build a boost converter, wanted to see how it works, what are the possibilities. I did not wanted to use an IC, so i build from parts that my friend had, used his equipment, and so on.
Edit: VDD is -9V.
U1 created frequency, around 80kHz, u2 provided PWM. Set to 80 KHZ, 80% duty cycle (80% low, 20 % high). This part worked great, verified on osciloscope. Massive heatsing on Q1 to prevent overheating. Q1 was IRF3415 not 3710 as in schematics.
The problem happened from battery, through inductor, through mosfet. All wires got burned after few seconds. Insulation melted, wires melted off. I was able to measure the voltage before disaster to be around 180V without load applied.
What did i do wrong? No load was applied, so there should have been low current draw.
I wanted to build a boost converter, wanted to see how it works, what are the possibilities. I did not wanted to use an IC, so i build from parts that my friend had, used his equipment, and so on.
Edit: VDD is -9V.
U1 created frequency, around 80kHz, u2 provided PWM. Set to 80 KHZ, 80% duty cycle (80% low, 20 % high). This part worked great, verified on osciloscope. Massive heatsing on Q1 to prevent overheating. Q1 was IRF3415 not 3710 as in schematics.
The problem happened from battery, through inductor, through mosfet. All wires got burned after few seconds. Insulation melted, wires melted off. I was able to measure the voltage before disaster to be around 180V without load applied.
What did i do wrong? No load was applied, so there should have been low current draw.
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