You received this message because you are subscribed to the Google Groups "neonixie-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+...@googlegroups.com.
To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/7ae38dca-64ca-459d-a1e5-283a062f8f9en%40googlegroups.com.
On 19 May 2022, at 12:42 pm, David Forbes <nixie...@gmail.com> wrote:
To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAPbqtvcg0ak%2BLMH_7JJ01eFnYjFzu38v2N59k8ZfoFxrRY3J_g%40mail.gmail.com.
On 20 May 2022, at 06:12, SWISSNIXIE - Jonathan F. <jfre...@gmail.com> wrote:
I've used a MAX1771 with ceramic capacitors a while ago for a pandicon-circuit and a smaller nixie project. Both consume less than 15mA@170V. Not sure how the circuit would behave at more current.
To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/bb141fcc-15ab-45de-a7ae-c9b38a3710dbn%40googlegroups.com.
Aging is another characteristic exhibited by ferroelectric, or Class II and III dielectrics. While manufacturing the ceramic capacitor, the dielectric is exposed to temperatures more than 1000°C. For Barium Titanate devices, the Curie temperature can be in the range of 130°C to 150°C, depending on the particular formulation. When exposed to the Curie temperature, the crystalline structure aligns to a tetragonal pattern. Once cooled, the ceramic’s crystalline structure changes to a cubic change. As this structure changes, so does the material’s dielectric constant.
Over time, the capacitance will continue to decline. It is possible to reset this aging cycle by “resetting” the material, by exposing it to its Curie temperature this usually occurs during re-flow. Typically, you can find the aging rate in the catalog for a particular part type. Below is an example of aging rates:"
Our problems started when capacitors started to break and/or fall of the circuit boards even though our designed were approved by the capacitor manufacturer! We also experienced the problems with degrading capacitance in MLCC capacitors but it was even worse with self-healing polypropylene capacitors as it affected the smart-meters power supplies - it all turned out to be manufacturing problems of the capacitors due to moisture in the materials.
"In practical applications, smart meters will fail, and even have batch
quality problems. In addition to the sampling inspection of the arrival
quality of smart meters, the analysis of the failure mechanism of smart
meters has become an important and long-term task. This article mainly
analyzes the component capacitance commonly used in smart meters, and
analyses the failure of chip multilayer ceramic dielectric capacitors
from appearance observation, electrical parameter testing,
metallographic slicing, and at the same time from electrolytic
appearance observation, electrical parameter testing, X- RAY, SEM and
EDS for failure analysis. The results of failure mechanism research not
only help to improve the reliability of the domestic energy meter
manufacturing level, but also can save energy meter maintenance and
transformation costs, and have very important practical significance for
the construction of smart grids."
On 20 May 2022, at 19:00, Dekatron42 <martin....@gmail.com> wrote:
To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/828a3fd5-aef6-4dcf-b413-a9ac327471f9n%40googlegroups.com.