Newxito, If heat is a concern I generally invest in cooling and changing the design to reduce heat instead of a thermal shutdown. Providing extra cooling and investing in parts the generate less heat ensures long component life and reduces the likelihood of fire.
When starting fires electrically, there are generally two options: create a spark the lights small tinder or heat any fuel to the point of spontaneous ignition. Physically the process is the same in both cases but the former is a faster process then the latter. Assuming you have a device that creates more than 1000 volts and sparks a fire, a temperature activated power supply shutdown isn't helpful when the power supply is *already on fire*. At which point nearby fire alarms need to be the next line of defense. Alternatively, if you have a device/power supply that is handling 100s of watts, the amount to power being used can approach the point of spontaneous ignition when things go wrong. In these high power situations, thermal measurements can detect when power is being used in dangerous and unhelpful ways and a thermal shutdown will protect the device. Nixie Clocks tend to be somewhat exotic devices but don't generally need 1000s volts or 100s watts to work. Hence Nixie Clocks don't have unavoidable fire/heat concerns that come with devices like large power supplies, electric stoves or electrical discharge insect control systems (bug zappers) and Greg's advice will creating electrical safe where it matters. On Tuesday, January 9, 2018 at 10:55:38 AM UTC-8, newxito wrote: > > I’m redesigning my clock board and I would like to make some safety > improvements. My actual board has two fuses, one for the 12V DC input and > one for the HV output. In order to prevent overheating (fire), I also would > like to monitor the temperature inside the case adding a DS18B20 to the > board. If the temperature exceeds a predefined limit the idea is to shut > down the HV. In normal operation with 6 x IN-18 the only component that > gets a bit warm is the HV coil but you never know. > > Is temperature monitoring an overkill? Any other ideas to improve the > design safety? > -- 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+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/329b1cb1-0db9-4d40-bc4d-14363d7c7ffc%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
