Timeline for BLDC/BLAC controller motor voltage reverse protection
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 4, 2019 at 10:51 | comment | added | Alex Er | @Ocanath yes, agreed. I was really too fixated on an integrated sollution and overthinking things with this LM5050. I appreciate the simplicty. Thank you very much! | |
| Dec 4, 2019 at 10:51 | vote | accept | Alex Er | ||
| Dec 4, 2019 at 10:51 | comment | added | Alex Er | @BruceAbbott that's a good sollution, I think i was really too fixated on an integrated sollution and overthinking things with this LM5050. I appreciate the simplicty. Thank you very much! | |
| Dec 3, 2019 at 23:47 | comment | added | Bruce Abbott | Perhaps I didn't make it clear enough. You don't want an ideal diode (which prevents reverse current flow during regeneration), but a device that only blocks negative power supply polarity. I don't think the LM5050 can do that. | |
| Dec 3, 2019 at 18:13 | comment | added | Ocanath | Using a high side gate driver for this 'works' but is over-engineering IMO for a feature with debatable value. Plus, I think either of the posted alternatives should fix your undervoltage issue | |
| Dec 3, 2019 at 14:59 | comment | added | Alex Er | The sensing and GND pins of the LM are isolated from the device ground. IMO this is not an incorrect technique as the IC has a gate driver, and sense input for rpp. The body diode doesn't really matter as it only conducts when everything is polarized correctly. When conduction occurs the internal comporator of the LM5050 checks the difference between drain and source and drives the gate if all is ok. | |
| Dec 3, 2019 at 11:25 | history | answered | Bruce Abbott | CC BY-SA 4.0 |