fedaye
Member level 2
Hey guys i have a half bridge like below, its all voltage waveforms are okay but the flowing current is extremely small. my resistor is a short circuited copper cable (despite the skin effect its resistance value becomes very small i have calculated it, roughly 0.09 Ω)
my operating frequency is 200 kHz.
i am doubtful about the capacitors' value (1000µF) maybe the value is very high. what do you think about this interesting stuff?
![20150406_161652.jpg 20150406_161652.jpg](https://www.edaboard.com/data/attachments/52/52049-c569e19d352de7cb06c4ad2e7bf79680.jpg)
![Adsız.jpg Adsız.jpg](https://www.edaboard.com/data/attachments/52/52048-e7c96949a5f074871b7531ecab39b08c.jpg)
this is the waveform of the "a" point in the half bridge picture:
![20150406_162001.jpg 20150406_162001.jpg](https://www.edaboard.com/data/attachments/52/52050-cdcc52597262dfafec144cd89af2ce5a.jpg)
by the way if i decrease the frequency from 200 kHz to 150 kHz then the current is increasing. (from 0.46 A to 0.72 A)
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edit:
my capacitors are electrolytic and i have read somethings about this. someones say electrolytic capacitors can act as an inductor at high frequencies. they are not convenient for high frequency and i must use film capacitors instead of them.
i think this is sensible.
my operating frequency is 200 kHz.
i am doubtful about the capacitors' value (1000µF) maybe the value is very high. what do you think about this interesting stuff?
![20150406_161652.jpg 20150406_161652.jpg](https://www.edaboard.com/data/attachments/52/52049-c569e19d352de7cb06c4ad2e7bf79680.jpg)
![Adsız.jpg Adsız.jpg](https://www.edaboard.com/data/attachments/52/52048-e7c96949a5f074871b7531ecab39b08c.jpg)
this is the waveform of the "a" point in the half bridge picture:
![20150406_162001.jpg 20150406_162001.jpg](https://www.edaboard.com/data/attachments/52/52050-cdcc52597262dfafec144cd89af2ce5a.jpg)
by the way if i decrease the frequency from 200 kHz to 150 kHz then the current is increasing. (from 0.46 A to 0.72 A)
- - - Updated - - -
edit:
my capacitors are electrolytic and i have read somethings about this. someones say electrolytic capacitors can act as an inductor at high frequencies. they are not convenient for high frequency and i must use film capacitors instead of them.
i think this is sensible.
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