Noise can also be coupled to a different switch through its contact-coil capacitance if it is driven by the same coil supply.

This charge transfer is due to the mechanical release or closure of the contacts, the contact-to-coil capacitance, and the stray capacitance between signal and relay drive lines.

Determined the electrical parameters of the charge IC, booster transformers, rectifiers, capacitance, trigger coil, excitation capacitor and IGBT, I completed the final printed circuit boards.