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(l)开关管工作过程市电(AC220V)整流、滤波后的300V直流电压,经开关变压器T803的⑥～④、③～①绕组及L824加到开关管Q823的集电极,并经启动电阻R828及L828、R821加到Q823的基极,从而使Q823开启导通。Q823集电极电流流过T803的⑥～④、③～①绕组,在其中产生“⑥端正、①端负”的感应电势,该电势耦合到T803的⑨～⑦绕组,在其中产生“⑨端正、⑦端负”的正反馈电势。此正反馈电势经R826、C820加到Q823基极,
(l) Work process of switching power supply Mains (AC220V) rectifier, filtered DC voltage of 300V, the switch transformer T803 ⑥ ~ ④, ③ ~ ① winding and L824 added to the collector switch Q823, and the start resistor R828 And L828, R821 added to the base of the Q823, so Q823 turn on. Q823 collector current flows through the T803’s ⑥ ~ ④, ③ ~ ① winding, which produces “⑥ correct, ① end negative ” of the induced potential, which is coupled to the T803 ⑨ ~ ⑦ winding, in which produce “ ⑨ correct, ⑦ end negative ”positive feedback potential. This positive feedback potential by R826, C820 added to the base Q823,