Timeline for Can spike voltage transient at input gates during control signals switching be avoid?
Current License: CC BY-SA 4.0
17 events
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| Oct 18, 2019 at 6:03 | comment | added | EinarA | The scope traces look more like improperly adjusted probes than anything else. | |
| Oct 17, 2019 at 15:41 | history | edited | Suvi_Eu | CC BY-SA 4.0 |
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| Oct 17, 2019 at 15:38 | answer | added | D.A.S. | timeline score: 1 | |
| Oct 17, 2019 at 15:29 | comment | added | Suvi_Eu | @JRE for sure, but this became another question different from the subject. Is it better that I open a new post with this other question? I'm very thankful about fixing a possible problem that seems to be. | |
| Oct 17, 2019 at 15:25 | comment | added | Suvi_Eu | @TonyStewartSunnyskyguyEE75 I'm doing it on a protoboard. I'm just designing the circuit. | |
| Oct 17, 2019 at 15:21 | history | edited | Suvi_Eu | CC BY-SA 4.0 |
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| Oct 17, 2019 at 15:19 | comment | added | D.A.S. | SHow your layout current, high impedance input paths & ground impedance. it may be a floating common mode noise error or more likely inductive pickup. | |
| Oct 17, 2019 at 15:00 | history | tweeted | twitter.com/StackElectronix/status/1184846584330276867 | ||
| Oct 17, 2019 at 14:31 | comment | added | JRE | If the same spikes are occuring even without the relay coils connected, then there's something really wrong, and the schematic diagrams become doubly important. | |
| Oct 17, 2019 at 14:29 | comment | added | JRE | I asked for the circuit because you seem to be trying to solve the wrong problem. You shouldn't be getting spikes on your supply if your flybacks are properly catching the kickback from the relay coils. You are trying to select a TVS to catch something that shouldn't be there. | |
| Oct 17, 2019 at 13:24 | history | edited | Suvi_Eu | CC BY-SA 4.0 |
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| Oct 17, 2019 at 13:17 | history | edited | Suvi_Eu | CC BY-SA 4.0 |
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| Oct 17, 2019 at 13:13 | comment | added | Suvi_Eu | @JRE The second one is that even if I'm not connecting the driver stage to the logic gates circuit I am having the same transient at the same pins. Give me some time for editing my post and share with all of you the transient and circuit pictures. | |
| Oct 17, 2019 at 13:13 | comment | added | Suvi_Eu | Thanks @JRE I doesn't put the circuit scheme because my question is about how to choose the TVS according to the needs (values) I posted and the 3 commented manufacturer voltage values. But my first intention with my question is to know how must I select a TVS according to my requirements: 12V (steady state), maximum spike value = 16V, desired max transient value = 13V (if it is possible - as short as better-), etc.. ? This is the first point. | |
| Oct 17, 2019 at 11:52 | history | edited | SamGibson♦ | CC BY-SA 4.0 |
Fixed typos and spelling. Also some grammar changes to help readability.
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| Oct 17, 2019 at 11:23 | comment | added | JRE | Can you post your circuit? It sounds to me like your flyback diodes aren't working properly. Maybe all you need is a small change in how they are connected. | |
| Oct 17, 2019 at 11:13 | history | asked | Suvi_Eu | CC BY-SA 4.0 |