The negative ion generator is a device to generate air negative ions. The device will process the input DC or AC power through EMI processing circuit and lightning protection circuit, and then limit the current through over-voltage through pulse circuit; High and low voltage isolation lines are upgraded to AC high voltage, and then pure DC negative high voltage is obtained after rectification and filtering with special grade electronic materials. The DC negative high voltage is connected to the release tip made of metal or carbon elements, and the DC high voltage at the tip is used to generate high corona, which releases a large number of electrons (e -) at high speed. However, electrons cannot exist in the air for long (the existing electronic life is only nS), and they will be immediately captured by oxygen molecules (O2) in the air, Thus, air negative ions are generated. Ceramic capacitors are widely used in negative ion generators, air purifiers, air purifiers, medical equipment, laser machines, X-ray machines, control and measurement equipment, igniters, generators, transformers, electronic equipment, voltage doubling modules, welding machines, electrostatic spraying and other electromechanical equipment requiring high voltage and high frequency.