Re: [neonixie-l] SMPSU efficiency

Michel van der Meij Mon, 07 Jan 2013 14:16:21 -0800

Thanks for the confirmation Jeff!
Even if somewhere between 79% and 96% would still be a good result!

Michel

on Jan 08, 2013, Jeff Thomas <[email protected]> wrote:

On Monday, January 7, 2013 2:44:09 PM UTC-7, Michel wrote:
Hello Folks,

While experimenting with an IN-13 bargraph tube I thought it would be

interesting to connect it up to my nixie watch HV supply and see how

far the bar would go. Since the voltage of the tube is lower than the

nixie tubes, the nixies won't light up when the bar graph tube is

wired parallel to the HV (as expected). This means all the current

from the HV supply goes through this bar graph tube and make it very

easy to measure the HV efficiency.

The drawn battery current is 130mA; battery voltage 3.37V. The average

HV supply is 112V and average tube current 3.1mA this would result in

a 79% efficiency.

However, you can only use the average values if either the tube

voltage or tube current is constant; in my case this is not so. So I

would say I need to use the RMS values of tube voltage and tube

current. If I measure these with a scope, I come to 113V RMS and

3.73mA RMS. This would then result in a 96% efficiency!!!

This measuring must be correct, right?

Michel

Hi Michel, if you're using a SEPIC for HV generation, then the calculated efficiency is plausible.
A transformer design could only achieve 80%, or perhaps a little better well tuned.

Regards, Jeff

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