импульсный БП

Dec 07, 2004 2 Replies

Hi All,



Собрал схему сабжа, по прототипу комповых БП (готовая плата БП АТ не годилась из за габаритов). Согласущий транс подключил напрямую к tl494 (вых ключи - на полевиках), ну, как положено, среднюю точку транса на +12В, остальные выводы на коллекторы tl494, эммитеры на землю.



Имеем следующие импульсы -



```````````````````` ``___``````___`````` ``|``|`````|``|````` `_|``|_```_|``|_```` `|`````|__|`````|__` ```````````````````` ````````````````````



Т.е регулируется по ширине только нижняя половинка импульса.



В идеале без транса -



```````````````````` ` _____```_______``` `|`````|``|`````|``` `|`````|``|`````|``` `|`````|__|`````|__` ```````````````````` ````````````````````



Нагружал вторичные обмотки резисторами 300-600 Ом - серединка все равно остается, выходные ключи естесно прошивает. Как быть ? Не хотелось бы применять транзисторный каскад, да и поможет ли он ?...



Bye ..


//Привет Sergey, //

Поделитесь, плз, провренной схемой включения полевых транзисторов, на tl494 (и согласующего трансформатора).

Пока ..

//ðÒÉ×ÅÔ Sergey, //

on *09.12.04* *22:53:08* you wrote in the area *SU.HARDW.SCHEMES*

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