Therearetwokindsofchargingmodeoftheohmpowersupply.Whenthedeviceworksnormallyandtheplasmabreakdownvoltageislow,theohmpowersupplywillruninthelogicalnon-loopcurrentmodewhichcurrentissymmetrical,butwhenthedischargingconditionisnotverywellandtheplasmabreakdownvoltageishigh,theunsymmetricalmodewillbeadopt,i.e.switchingoffthepositiverectifier,