The label of the transformer is reversed, so when it is connected incorrectly, the sampling resistor R11 is broken. I don't understand the mechanism of transformer, ZCD and GD. I hope someone can explain it to me.
Raul postato su October 14, 2020
You should use RCD to absorb it, TVS may not be very good, especially for larger power.
Kristian postato su October 14, 2020
Be sure to remember to string a light bulb before powering it up if you are not sure whether it will explode.
Niko postato su October 14, 2020
Sometimes a few cycles can damage MOS. Even if the light bulb is stringed. After the large capacitor is fully charged, the energy is still sufficient. After it broke, I saw the light was on all the time.
Matias postato su October 14, 2020
Is it because the transformer is not loaded?
