Timeline for Getting 12Amps of 0-12VDC from relatively low frequency PWM
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 3, 2020 at 8:00 | comment | added | Dampmaskin | If you're going to add a dedicated IC for PWM, you might as well look into specialized parts. Google high frequency pwm controller. | |
| Jan 3, 2020 at 1:39 | comment | added | Meta | @Dampmaskin Yeah, that seems like the best bet! Even if it screws up I2C (can't remember if it relies on the timer or not), I could at the very least use a second 328, and use parallel IO to send it commands. Certainly beats being stuck at 960Hz! | |
| Jan 2, 2020 at 23:48 | comment | added | Dampmaskin | You can get faster PWM by sacrificing resolution. Apparently the Atmega328 can output up to 8 MHz PWM with 1 bit resolution (and probably an external clock). Of course a 1 bit PWM is not very useful for most purposes, but if you can get 2 MHz with 4 bit resolution, maybe that will be sufficient for you? withinspecifications.30ohm.com/2014/02/20/Fast-PWM-on-AtMega328 | |
| Jan 2, 2020 at 23:24 | answer | added | D.A.S. | timeline score: 1 | |
| Jan 2, 2020 at 22:48 | comment | added | Meta | I would, but the micro I am using can only PWM at 490Hz or 960Hz, without changing registers. (Which may have unintended consequences.) Apparently it can go as high as 62kHz, but you start loosing resolution above that. I don't know what that would do to it's ability to use I2C, etc, but this definitely seems like it's worth looking into. Possibly even using another micro. | |
| Jan 2, 2020 at 22:35 | comment | added | D.A.S. | The false spec is the low frequency, increase 100k to 2M | |
| Jan 2, 2020 at 22:01 | answer | added | user69795 | timeline score: 0 | |
| Jan 2, 2020 at 21:45 | review | First posts | |||
| Jan 3, 2020 at 6:22 | |||||
| Jan 2, 2020 at 21:40 | history | asked | Meta | CC BY-SA 4.0 |