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Mikrocontroller-Steuerung mit serieller Schnittstelle für den Photovoltaik-Kennlinien-Analysator

Mikrocontroller-Steuerung mit serieller Schnittstelle für den Photovoltaik-Kennlinien-Analysator

          
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About the Book

Inhaltsangabe: Zusammenfassung: Die Diplomarbeit ist eine Weiterentwicklung eines schon existierenden, sehr bewährten Meßsystems zur Kennlinienaufnahme von Photovoltaikzellen und -generatoren. Die Arbeit ist am Institut für Solarenergieforschung in Emmerthal sehr praxisnah entstanden. Das Meßsystem wird nach der erfolgten Serienreife noch heute verkauft. Zu Anfang wird kurz auf Photovoltaik und die Kennlinien von PV-Generatoren eingegangen. Nachdem die Besonderheiten und Eigenheiten verstanden sind, wird die prinzipielle Meßwertaufnahme erklärt. Soviel vorweg: Durch Aufladen eines festen Lastkondensators werden die Werte ermittelt. Um Kennlinien von einer Zelle bis hin zu großen PV-Generatoren (Verschaltung vieler einzelner Zellen) mit einem festen Kondensator aufnehmen zu können, muß die Meßwertaufnahme sehr schnell und auch variabel sein. Dieses erfordert eine leistungsstarke Hardware, die jedoch durch den Einsatz eines 8051 Mikrocontrollers mit ausgeklügelter Software auf ein Minimum beschränkt bleibt. Somit teilt sich die Diplomarbeit in zwei Abschnitte auf: Die Hardware und die Software. Die Hardware: Das Mikrocontroller-System ist das verbindende Herzstück aller Funktionsblöcke. Für diese Anwendung reicht der kleinste Standard 8051 Mikrocontroller, ein 80C31 voll und ganz aus. Ein Konverter (MAX232) für die serielle Schnittstelle übernimmt die Anpassung der TTL-Signale an den RS232-Standard. Da im Leistungsteil (Analogteil) mit hohen Strömen und Spannungen gearbeitet wird, ist die Schnittstelle, für einen optimalen Schutz des PCs, galvanisch über Optokoppler getrennt. Neben den Komponenten für die Steuerung des Leistungsteils gibt es den Block für die Analog-Digital-Umformung der Meßwerte. Dieser besitzt einen 333 ksamples/s schnellen und 12 Bit auflösenden ADU. Über 4 Sample&Hold-Stufen können 4 Analogwerte (hier Strom, Spannung, Temperatur und Bestrahlungsstärke) zeitdiskret erfaßt werden. Die Digitalwerte werden im Daten-RAM zur weiteren Verarbeitung abg


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Product Details
  • ISBN-13: 9783838601854
  • Publisher: Diplom.de
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 7 mm
  • Width: 148 mm
  • ISBN-10: 3838601858
  • Publisher Date: 06 Aug 1997
  • Height: 210 mm
  • No of Pages: 112
  • Series Title: German
  • Weight: 154 gr


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