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 -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/ioFfr6XdJPMJ. For more options, visit https://groups.google.com/groups/opt_out.
