Glowing LED problem: technical explanation with 5 possible fixes
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5 سال پیش
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This promised video is long
This promised video is long overdue. The nuisance glowing or flashing of the LED is due to the way the wiring capacitances add or subtract with a susceptibleLED bulb. I hope I have explained more clearly in this video. The original video was to demonstrate the problem where the LED bulbs keep glowing when they are physically switched (or turned) off, at a standard light switch. Please note that if you have a dimmer switch it's really a different problem due to let by current but I will try and make a video addressing that issue in the future.
Other than the first suggestion of getting the correct LED bulb, the other solutions are unsuitable for non electrically qualified/competent people to implement. So for the other solutions you must consult a suitably qualified electrician to fix this for you.
video contents chapter thingy
0:00 introduction
2:00 explaining the kit I'm using for the demo
3:12 Showing the bulbs in normal operation as baseline
4:25 general recap of why the issue happens
6:36 visual emulation of described issue, on equipment
8:01 1 of 5 ways to fix:(get the right product)
8:22 explanation of correct wiring normally recommended
8:50 visual emulation of using correct wiring
9:10 explanation why it didn't work in this instance
9:58 simplified schematic diagrams of both circuits using capacitors
12:35 2 of 5 ways to fix:(ensure wired correctly)
12:45 woolly explanation of why we have an earth in lighting these days
13:35 emulation of a bad wiring setup (switched neutral)
14:50 how you can identify the correct product (difficult)
15:37 emulation showing how earth makes a difference when wired properly
16:34 3 of 5 ways to fix: (using a shunt bulb)
17:19 4 of 5 ways to fix: (using a shunt resistor)
18:20 why you need to be very careful when choosing a shunt resistor
19:29 demo using an 820k shunt resistor
20:15 considerations for location and placement of shunts
21:05 5 of 5 ways to fix: (using a shunt capacitor)
21:47 demo using a 2nf shunt capacitor
22:00 why you need to be very careful when choosing a shunt capacitor
24:35 considerations for capacitor shunts
If you wish to consider the shunt capacitor route, I would suggest 10nf X1 Y1 (or X1 Y2) mains class cap and a value no greater than 100nf, as you will start to need to consider a safety bleed down resistor to dissipate any residual voltage in the capacitor, as it will become a potential shock hazard if you don't. I believe the value stated is 200nf or greater, which is sighted in the UK regulations but cannot recollect precisely. Apparently it is listed in section 559.7 but, as I do not have a copy of the current regulations, I cannot confirm this.
Here is an UK amazon affiliate link for a pack of 10x 10nf caps: amzn.to/3vIdFiR
As described, the location where the shunt is fitted is critical as well as the shrouding of any exposed conductors within a suitable mains rated enclosure, such as the light fitting or pendant enclosure.
previous video: • Curious demo of a glowing LED, even w...
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5 سال پیش
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