This power is ordinary non-isolated, 8-24W, used as a ceiling power, due to the United States, there should be 2500V surge test, I made a few boards, respectively, for surge test.

The first is to use ordinary pressure sensitive resistance, can withstand 1000V no problem. Later, with the inductance and resistance to test, the effect is not, I think of a few years ago with the high sensitivity of the varistor to test, and the use of Shanghai Bao Gong's varistor were tested.

The final conclusion: with the Shanghai Bao Palace of the varistor, a success. And with high sensitivity pin resistance to live in 2000V, and then later added an ordinary varistor, so that you can, because the cost of the relationship, the choice of two high and one low varistor 2 hair a little more, Shanghai Bao Gong pressure Min resistance to a 1.5 yuan, can be used in high-level circuit. If you feel the margin is small, you can also string a 1Ω resistor on the circuit, or with two highly sensitive varistors. The following is a good power image. Non-isolated high P power supply, due to the absorption of electrolysis does not make the surge more difficult.

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