24-volt switching power supply why leakage
2, switching power supply high side and low side (that is, optocoupler across the 2 side, the general circuit board between the two sides will have a clear distance between the split) generally have an EMI capacitor (part of the power supply may also be connected in parallel with a high resistance )), Which is the reason why the switching power supply has leakage current.
1, the ground has two y capacitors Neutral grounding way connection, (fire --- || --- --- ---| --- zero) In this way if the socket is good grounding is no problem, But the socket ground if the virtual connection, this time on the line with 110V (may be higher and lower) equivalent potential, if the electrical appliances are metal shell ground, it is possible that the entire shell are charged, the pen will be bright, Ma hand.
3, the real induction power, as long as the power supply, whether it is power or switching power supply, the general transformer high voltage low side will have an equivalent capacitor, can be seen as the first two conditions, there will be a trace of leakage current, This situation can not be avoided.
