Author Topic: High impulse voltage from 5W power supply  (Read 314 times)

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Offline ankurb

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High impulse voltage from 5W power supply
« on: January 13, 2018, 01:59:31 pm »
Hi experts!

I'm doing a test with a 3B 5kV power supply U33010?115 and noticed during fast short circuits I'm getting large power impulses of high wattage. It could be my faultly oscilloscope but was wondering if it is possible for the power supply to reach very high wattage output or is there something internally that prevents this. Hoping to pinpoint the problem.

I have a capacitor that is going short circuit periodically at time of approximately every 200 us and trying to measure the voltage over the resistor that is in series with it. Goes short for maybe 0.5 us or so. During the 0.5 us I am getting very high voltages hence very large currents over my smaller ohm resistor.

Any thoughts would be appreciated.


Offline jeroen79

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Re: High impulse voltage from 5W power supply
« Reply #1 on: January 13, 2018, 04:22:53 pm »
What exactly are you observing?
Post some numbers or scopeviews to make things more exact.
Large power and high wattage would be the same thing, high voltage something else.

How is your capacitor going short circuit?

Connecting an uncharged capacitor to a voltage source could result in a large inrush current.
And connecting the charged output capacitor of the power supply to a low impedance load could cause a high discharge current.

Offline T3sl4co1l

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Re: High impulse voltage from 5W power supply
« Reply #2 on: January 13, 2018, 04:56:53 pm »
Yes, consider the equivalent circuit of the power supply, which I'm guessing has capacitors on its output.

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