Testing Troubleshooting an Inverter Circuit Discussion

Posted on Feb 4, 2014

Since you say that with my PWM circuit the current consumption of the inverter shoots to a dangerous 14Amps, therefore I just thought, probably we can solve this by reducing the drive voltage to the gates of the mosfets. This can be simply done by controlling the base voltage of the buffer transistors. And that is exactly what we are trying to do

 Testing Troubleshooting an Inverter Circuit Discussion
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by connecting a variable resistor across the base and the ground of each transistor. As discussed earlier, use lamp and ammeter set-up with the inverter and adjust the 15K pot until the current consumption becomes equal to your square wave design. Hi Swagatam, I performed that test with the headlight, Amp meter and PWM circuit, it was drawing 2. 1 Amps, but whenI tried to adjust the Pot, nothing really happened, the Amps did Not increase or decrease, only when i turned the Pot almost all the way left, it would kill the wave form, literly stopping the inverter, then turning the Pot back to the right the wave form would come back and you can hear the inverter run. The whole time the Headlight did not change in brightness. My laptop Oscilloscope is only Software, with a homemade probe. Unfortunately most laptop Mics Input is in Mono, one channel. So I cant test both wave forms at the same time to see if there overlapping. Another observation I made, Ive been studying a few other circuits that are all using the 4017 Chip. Ive noticed that none of them have those buffer transistors that are used in my original square wave circuit. What ifI remove them from the circuit altogether. Ive noticed that in all the other circuits the Clock Input goes directly to the 4017, then out of the two Outputs that they are using, directly to the gate of the mosfet through a small resistor. You may try different configurations taking the help of...

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