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Dimmable LED Lightbulb - INSANE Schematic!
Teardown of a dimmable 5.5W 470lm LED light bulb from Livarno Lux. Rated 220-240V 50Hz. It is completely filled with a resin. Disassembly was a bit tricky. The circuit is a "little bit" overcomplicated. It has a double sided board with SMD components on both sides, even under the THT components. Drawing a schematic turned into insanity. It has BP3216 chip. The supply seemed to be a buck regulator, but actually it is a switching voltage inverter. This kind of inverter is capable of both step up and step down operation. There's no big capacitor at the output of the bridge rectifier, so that it can work with a triac regulation. The output current of the inverter is proportional to the average input voltage. There are 14 LED packages - Two chains of 7. Each package contains 2 LED chips. Total LED voltage is 40.7V. The LEDs are on an aluminium substrate PCB and a heat sink. This makes contact with another heat sink in the plastic body. This one cost 2.50 USD and comes from a local supermarket.
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