Timeline for What is the most used bi-polar output SMPS topology in gate driver isolation?
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
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| S Jan 26, 2023 at 7:19 | vote | accept | Younes Thabet | ||
| Jan 25, 2023 at 20:21 | answer | added | Tim Williams | timeline score: 1 | |
| Jan 25, 2023 at 19:06 | comment | added | Younes Thabet | @TimWilliams Yeah, I am planning to redesign it but first I need to review my schematic as there is always the possibility that I made an error during rev-eng. There are 3 tl494 each one providing power for 2 gate drivers which makes it a total of 6 gate drivers specifically for inverter applications. Why would PNPs make more sense than N-MOS? in the datasheet and in most TL494 schematics they always use MOSFETs! in the PCB these switching devices are SOT-23 packages with JCT8 SMD code so at first, I thought they might be transistors and then saw most schematic uses MOSFETs so I made them so. | |
| Jan 25, 2023 at 17:41 | comment | added | Tim Williams | So what do you want to do with this, repair it? Make a new one? Is this power supply section a module on top of the drivers, or is there more? There are enough oddities in this circuit (as designed, that I don't think can be attributed to tracing errors) that I'd completely redesign it (but, I am a designer, so of course I would). | |
| Jan 25, 2023 at 17:38 | comment | added | Tim Williams | Oh, I didn't see the C1/C2 net labels before. I guess they are cross-connected. PNPs would make more sense than N-MOS then, and the TL494 itself would be the DC return path. A tip, better to draw connections than to use net labels -- always go for clarity. | |
| Jan 25, 2023 at 15:17 | vote | accept | Younes Thabet | ||
| S Jan 26, 2023 at 7:19 | |||||
| Jan 25, 2023 at 12:33 | history | edited | Younes Thabet | CC BY-SA 4.0 |
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| Jan 25, 2023 at 11:52 | comment | added | Andy aka | The two PNP BJTs driving the transformer primary look like they won't do the job; shouldn't there be some other components? Have you drawn it correctly? Please change your diagram to include reference designators and explain why the +15 volts needs boosting to 16.7 volts. Add all data sheet links and name the transistors on the schematic. | |
| Jan 25, 2023 at 10:58 | answer | added | Rohat Kılıç | timeline score: 0 | |
| Jan 25, 2023 at 10:17 | comment | added | Younes Thabet | @TimWilliams X? is a gate driver transformer and as far as I know, the primary side isn't connected to GND. | |
| Jan 25, 2023 at 10:15 | comment | added | Younes Thabet | @TimWilliams This is a broken legacy gate driver board used to drive inverter IGBTs. I use this power supply to isolate the input and output sides of the gate driver and provide bi-polar rails (15V and -15V). I am currently trying to create a schematic for it. | |
| Jan 25, 2023 at 10:07 | history | edited | ocrdu | CC BY-SA 4.0 |
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| Jan 25, 2023 at 10:04 | comment | added | Tim Williams |
We need some context here: what is this circuit from? What does it do, or supposed to do, or be a part of? Why does it have no designators (this makes it very hard to discuss)? Is X? missing a DC return path?
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| S Jan 25, 2023 at 9:40 | review | First questions | |||
| Jan 25, 2023 at 10:07 | |||||
| S Jan 25, 2023 at 9:40 | history | asked | Younes Thabet | CC BY-SA 4.0 |