15问答网 > 长虹R2118A型电视机，关机亮点消除电路的工作原理是怎样的？

长虹R2118A型电视机，关机亮点消除电路的工作原理是怎样的？

尽可能详细
2025-03-16 06:08:53
推荐回答（1个）
回答1：

长虹R2118A关机消亮点，主要元件由V610、VD610、C610、R610组成。 正常开机12V上来，经过VD610对C610充电，关机时，12V负载多，电压立刻下降，VD610反向截至的，所以C610电平不会因为12V下降而下降，12V下降后V610-PNP型管的B极成低电平，E极高电平，此时V610的E极对C极饱和导通，C610的电平送至V610的C极分别经过VD611、VD612、VD613送至三个NPN型视放管的B极，此时视放管饱和导通，使200V电平得到释放，完成关机消亮点。此方式叫“释放型消亮点电路”

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