Timeline for Measuring Output Ripple Voltage
Current License: CC BY-SA 4.0
12 events
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| Jun 11, 2020 at 15:10 | history | edited | CommunityBot |
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| Nov 22, 2019 at 9:24 | comment | added | Bimpelrekkie | Have you researched "DCDC converter ripple voltage" and understood what causes this ripple voltage and what it (theoretically) looks like? You have to decrease the timebase value and sensitivity to see the right waveform. please help me clearly I'm not going to "hold your hand" to guide you, I expect that you do your own research/study first. | |
| Nov 22, 2019 at 8:58 | comment | added | user220456 | What can be taken as the ripple voltage? As you can see from the waveform, both sets (both equal amplitude) of yellow peaks have the same switching frequency? So, what can I take as the ripple voltage in the yellow waveform? please help me clearly | |
| Nov 22, 2019 at 8:43 | comment | added | Bimpelrekkie | You can measure the switching frequency from the ripple at the output. | |
| Nov 22, 2019 at 8:43 | comment | added | user220456 | Am I adding more capacitance by probing the switching node which is influencing my ripple voltage measurement? Is this the reason? | |
| Nov 22, 2019 at 8:42 | comment | added | user220456 | So, I can't measure the ripple voltage and the switching frequency at the same time to get a clean waveform? | |
| Nov 22, 2019 at 8:40 | comment | added | Bimpelrekkie | The switching node is simply very sensitive and has high frequency content. So anything you touch it with will influence the DCDC's behavior! So: just don't touch it unless you have a really-really low inductance/capacitance probe like a FET probe. A proper one will be quite expensive though. | |
| Nov 22, 2019 at 8:40 | comment | added | user220456 | Thank you! Could you please clarify my comments? | |
| Nov 22, 2019 at 8:39 | comment | added | user220456 | Or does it have to do something with my grounding ? Nothing related to grounding? | |
| Nov 22, 2019 at 8:38 | history | edited | Bimpelrekkie | CC BY-SA 4.0 |
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| Nov 22, 2019 at 8:37 | comment | added | user220456 | Thank you! But how does measurement influence my output capacitor ripple voltage? Are you meaning to say that by measuring the switching frequency at the switching node, I am adding more capacitance. And this additional capacitance is reflected at the output capacitor of the converter and therefore I see high Ripple voltage? | |
| Nov 22, 2019 at 8:34 | history | answered | Bimpelrekkie | CC BY-SA 4.0 |