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关于波段开关的应用
Time:2018-12-25 Read: 1241

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按操作方式可分为:旋转式,拨动式及杠杆式,通常应用较多的是旋转式开关。 2,波段开关结构 结构特点常见的波段开关及万用电表的换挡开关均为波段开关,其结构有两种:一种BBM(BreakBeforeMake)接点型,其特点是在换位时动接点先断开前接点后再接通后接点,其间有一个与前后接点。

二,波段开关结构

结构特点常见的波段开关及万用电表的换挡开关均为波段开关,其结构有两种:一种是BBM(BreakBeforeMake)接点型,其特点是在换位时动接点先断开前接点后再接通后接点,其间有一个与前后接点都断开的状态:另一种是MBB(MakeBeforeBreak)接点型,其特点是在换位时动接点有一个与前后接点都接触的状态.然后再断开前接点,与后接点保持接触状态。在电路设计中应根据电路用途和电路安全来选择合适的波段开关。

三,波段开关原理

原理将电源开关K2闭合,再按下按钮开关K1,这时,晶体二极管V1、V2导通,继电器吸合。同时电源对电容器C充电。当K1断开后由于C已被充电,它将通过R和V1V2放电,从而维持三极管继续导通,继电器仍然吸合。经过一段时间的放电,C两极间电压下降到一定值时,不足以维持三极管继续导通,继电器才释放。从K1断开到继电器释放的时间间隔称为延时时间。它决定于R和C的大校一般C为100微法时,调节可调电阻器R可获得10秒至90秒的延时时间。

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