We recently received a Ultravolt 2AA24-P20 unit. During the testing, we observed a peak in the current plot (attached plot), which then quickly returned to normal levels, while the voltage plot remained consistently stable. The load applied during the test consisted of a 100 MΩ resistor and a 500 kΩ resistor in parallel, with an applied voltage of 500 V.
Hello yuejun.xu22,
Welcome to the DigiKey TechForum.
I’m not familiar with this device. Hopefully one of the Engineers can add to this post, and help with these test results.
From the plot provided that looks like a tun-on transient; a brief period when power is applied to the device where internal energy storage devices are being filled.
That would be an extremely common behavior and quite normal.
Hi rick_1976,
Thank you for providing the information. We have another unit from the same company (Ultravolt 10A12-P4), and we haven’t observed this issue with that one. Do you have any suggestions on how we can eliminate this effect?
Devices from different product series can be expected to have different internal designs and may not behave in precisely the same ways.
Depending on the specific cause, it may be possible to reduce the effect by slowing the rate at which the supply voltage rises. Such a solution is often more troublesome than the problem however, which is why it is not uncommon to see even small AC-DC adapters drawing 10’s of amps at startup.
