The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 2006
Filed:
Feb. 11, 2005
Arno Reinhard, Munster, DE;
Armin Wegener, Beckum, DE;
Rudiger Malsch, Bad Schandau, DE;
Ralf Gennant Berghegger Schroder, Glandorf, DE;
Arno Reinhard, Munster, DE;
Armin Wegener, Beckum, DE;
Rudiger Malsch, Bad Schandau, DE;
Ralf Gennant Berghegger Schroder, Glandorf, DE;
FRIWO Mobile Power GmbH, Ostbevern, DE;
Abstract
The present invention relates to a control circuit for controlling the output power of a primary-controlled switched mode power supply unit, which comprises a primary switch and a transformer with an auxiliary winding. Within the auxiliary winding, voltage pulses are induced by primary-sided switching operations, which can be taken into account when controlling the output power. In order to provide an improved control and an enhanced flexibility with respect to the operational parameters, the sampling instance is determined based on the duration of the voltage pulse at the auxiliary winding during a previous switching cycle. In order to detect a defective contact between the auxiliary winding and the control circuit in a particularly simple and secure manner, the negative voltage pulse at the auxiliary winding occurring when the switch is closed may be used for confirming a proper connection. In order to optimize the switching off process of the switch and to reduce power losses, the output power may be controlled by comparing the current through the primary winding with two threshold values.