Timeline for H-bridge low side current sensing: Current signal with oscillation why?
Current License: CC BY-SA 4.0
24 events
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| Oct 8, 2022 at 12:03 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
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| Aug 26, 2021 at 19:30 | answer | added | bunker89320 | timeline score: 1 | |
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| Apr 17, 2020 at 18:00 | history | tweeted | twitter.com/StackElectronix/status/1251208859282178049 | ||
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| Dec 13, 2019 at 23:03 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
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| Dec 16, 2018 at 0:02 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
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| May 18, 2018 at 16:59 | answer | added | Toby Sanchez | timeline score: 0 | |
| May 18, 2018 at 16:29 | answer | added | Andy aka | timeline score: 0 | |
| May 18, 2018 at 16:12 | comment | added | jms | To me like this looks like something couples capacitively to the current sensing signal path. It only happens after a slight delay relative to the yellow trace (the logic level PWM input), because the driver has a propagation delay. Try replacing the motors with a non-inductive dummy load (resistor), do you still see those spikes? I bet you do. | |
| May 18, 2018 at 16:09 | comment | added | Caleb Reister | Brushed DC motors are extremely noisy and draw large amounts of current in short bursts. You will likely need a lower cutoff frequency on your filter. Also, if it doesn't already have them, make sure you add three capacitors directly to the motor (between the terminals and between each terminal and the shell). | |
| May 18, 2018 at 15:57 | review | First posts | |||
| May 18, 2018 at 17:12 | |||||
| May 18, 2018 at 15:56 | history | asked | Emmanuel | CC BY-SA 4.0 |