Timeline for Strange behavior on transformer driver
Current License: CC BY-SA 3.0
11 events
| when toggle format | what | by | license | comment | |
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| May 27, 2016 at 14:34 | comment | added | Marcovecchio | Let us continue this discussion in chat. | |
| May 27, 2016 at 14:18 | comment | added | Marcovecchio | @Sparky256, thanks once again. I will add the capacitor today, I hope this will make the driver finally useable. Just a last question, please: do you recommend using bipolar transistor as I did, or mosfets? | |
| May 27, 2016 at 3:31 | comment | added | user105652 | The diodes are not needed as long as Q1 and Q4 are rated for 3 times the supply voltage, or about 50 volts. | |
| May 27, 2016 at 3:24 | comment | added | Marcovecchio | @Sparky256, thanks again, indeed I had huge spikes, and I was going to try adding diodes to filter them. I will use capacitors instead. | |
| May 27, 2016 at 3:08 | comment | added | user105652 | The capacitors filter out the noise spikes on the power supply rails. I think a 470uF 16v to 25vdc capacitor connected at emitter of Q2 and Q3 (-terminal or lead), and the + lead connected to the +12 vollts where the transformer center tap is connected. You only want the drive (pulse) current at the transformer, not on your 12 volts power lines. That should clean up the waveform even more. | |
| May 27, 2016 at 2:54 | comment | added | Marcovecchio | Thanks for the suggestions, @Sparky256! It seems I reversed the whole thing... I made the changes you suggested, and it seems to be working way better! However, could you please explain why do I need the caps on the power supply? | |
| May 27, 2016 at 2:49 | history | edited | Renan | CC BY-SA 3.0 |
deleted 64 characters in body
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| May 27, 2016 at 2:45 | vote | accept | Marcovecchio | ||
| May 27, 2016 at 1:51 | answer | added | Bruce Abbott | timeline score: 2 | |
| May 27, 2016 at 0:53 | comment | added | user105652 | You should be grounding the emitters and use the collectors as outputs to the transformer. The center-tap then connects to the +12 volt rail. You need bypass caps on the power supply. The PWM drive signals should not overlap, but have a 'dead' time. Do NOT test without the transformer connected. Much work to do. | |
| May 26, 2016 at 23:56 | history | asked | Marcovecchio | CC BY-SA 3.0 |