Triac switching mains LED lamps- interesting problem - Raspberry Pi Forums

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in current project, iot fashion, set mains lamps controlled across 'net via web page.
software & pi fine.
circuit use- opto-zerocross-triac triggering power triac- i've used years on loads of 200w plus.
when used on 5w mains led circuit keeps either blowing resistor or low-power phototriac output.
image
seems happen holding current bigger load current, main triac @ least turns off within half-cycle of mains, low power 1 stays on. means excessive current/power low power triac , burnout.
i've never seen problem described in text or web.

can circumvent using lower power output triacs lower holding currents. i've been used thinking it's universal circuit 1 moment switches desk lamp, spotlight, or mains drill motor. not now!

is 5w led lamps use bridge , capacitor?

found out led lamp. surge power because need charge capacitors.

maybe try add 47 ohm 1w resistor in series 5w lamps.
if problem resolves it.

daniel


raspberrypi



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