Автоматический стабилизатор напряжения

30 июля 2015г. - 14:16 3459 просмотров

Автоматический стабилизатор напряженияАвтоматические стабилизаторы напряжения необходимы для автоматического регулирования питающихся напряжений, а также для обеспечения сравнительного постоянства токов. При изменении напряжения сети и сопротивления нагрузки применяются ряды автоматических регулирований, которые позволяют упростить управление радиоприемными устройствами и автоматически обеспечивают и поддерживают оптимальные условия приема сигнала.

Сигнал изменения непрерывной величины и изменения напряжения питания компенсирует авторегулирование. Применяется автоматические стабилизаторы напряжения также в радиопередающих, телевизионных, радиоприемных и в разных устройствах. Отсутствие стабильного источника питания может либо значительно усложнить схему устройства, либо сделать невозможной его нормальную работу.

Использование сухих батарей и аккумуляторов как источников стабильного (устойчивого) напряжения в подавляющем большинстве случаев нерационально из-за большого обьема, веса и эксплуатационных неудобств этих источников питания. Желая использовать для питания сеть переменного или постоянного тока, необходимо включить между сетью и нагрузкой то или иное устройство, например однофазовый автоматический стабилизатор напряжения, позволяющее получить напряжение с нужной степенью стабильности (рис.1). В питающей сети наблюдаются изменения двух типов: постепенное увеличение и уменьшение общей нагрузки сети, вызванное медленным изменением напряжения, а быстрые изменения вызываются пуском и выключением отдельных электрических установок (электродвигателей).

Схема включения стабилизатора напряжения

Рис.1 Схема включения стабилизатора напряжения

Изменения отрицательно сказываются на качестве радиоприема и, в ообенности, на качестве телевизионного изображения. Медленные колебания в автоматическом стабилизаторе напряжения вызывают изменения размеров изображения, а также его яркости и контрастности с течением времени.
Стабилизация напряжения питания в настоящее время должна быть обязательной. Это очень важно для всех измерительных приборов. Большинство устройств обладают способностью поддерживать постоянство не только при изменениях напряжения сети, но и при изменениях тока.

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