SOFT START OF A SWITCHED SECONDARY CONTROL CIRCUIT FOR A SWITCHED MODE POWER SUPPLY

Usually when switched secondary control is used to regulate output voltages in a flyback converter, high peak currents through the secondary switch occur during startup. Traditional soft-start methods cannot be applied to limit these peak currents. With the inventive control circuit and method, curr...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
1. Verfasser:	JULICHER PAUL JOHANNES MARIE
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONTROLLING CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION PHYSICS REGULATING SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	Usually when switched secondary control is used to regulate output voltages in a flyback converter, high peak currents through the secondary switch occur during startup. Traditional soft-start methods cannot be applied to limit these peak currents. With the inventive control circuit and method, current limiting during startup is achieved by measuring the magnetic flux in the fly-back transformer, and by advancing the time instant at which current flow through the secondary switch (11) starts with respect to the end of the flyback stroke in dependence of the magnetic flux in the transformer.