论文部分内容阅读
(6)准谐振电路准谐振电路由IC6构成的开关为准谐振电源或最低点电源,通过检测开关变压器T2有无感应信号(“二次”绕组的回扫电压)或者开关管Q5的D极电压的最低点来触发导通Q5。当IC6的①脚电压高于65mV时,其⑤脚输出低电平,Q5保持关断状态;当IC6①脚电压低于65mV时,经内部消隐延迟时间后,其⑤脚输出高电平,Q5导通,开始新的变换周期。这样,可使EMI电磁噪声干扰最小。设置消隐延迟电
(6) Quasi-resonant circuit Quasi-resonant circuit consists of IC6 switches constitute the quasi-resonant power supply or the lowest point of power, by detecting the presence of transformer T2 switching signal ( “secondary ” winding flyback voltage) or switch Q5 The lowest point of the D pole voltage to trigger conduction Q5. When IC6 ① pin voltage is higher than 65mV, its ⑤ pin output low, Q5 remain off; when IC6 ① pin voltage is lower than 65mV, after the internal blanking delay time, the ⑤ pin output high, Q5 turn on, start a new conversion cycle. In this way, EMI electromagnetic noise can be minimized. Set the blanking delay