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②U802的輦輯訛脚的外接电容C816将和变压器T802的①~②绕组产生串联谐振电路,谐振电路在C816两端产生谐振电压,若在该谐振电压的最低点,使开关管导通,则可将开关管的导通损耗降至最小。③为达到开关管在C816两端电压最低时才导通的目的,电路中设有延迟导通电路,延迟导通电路由D805、R820、R818、C815等组成。在C816与T80“2一次”
② U802 辇 series of erroneous feet of the external capacitor C816 and transformer T802 ① ~ ② windings produce series resonant circuit, resonant circuit resonant voltage in both ends of the C816, if the lowest point in the resonant voltage, the switch is turned on, then Switch on-conduction losses can be minimized. ③ In order to achieve the purpose of turning on the switch when the voltage across C816 is the lowest, the circuit has a delay turn-on circuit, and the delay turn-on circuit consists of D805, R820, R818 and C815. At C816 and T80 “2 Once ”