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:
Aug. 10, 1999
Filed:
Jan. 14, 1999
Harald Weinmeier, Vienna, AT;
Volker Potzelberger, Linz, AT;
Siemens Aktiengesellschaft Osterreich, Wien, AT;
Abstract
Switched mode mains power supply unit having a transformer (Tr), which comprises a primary winding (L.sub.P) and at least one secondary winding (L.sub.S) as well as an auxiliary winding (L.sub.H), having a switch (S) controlled by a control circuit (A), by means of which switch the primary winding is connected to an input direct voltage (U.sub.E), having, connected downstream of the secondary winding, a rectifier (D1) together with a filtering means (C1) for producing an output direct voltage (U.sub.A) and having a regulator means (K1) for producing a first control variable (St1) for the control circuit (A) in dependence upon the deviation of the output voltage from a first set value (U.sub.Ref1), wherein the pulse duty ratio and/or the frequency of the control signal of the controlled switch depends upon the control variable, and also having an auxiliary rectifier (D2; Glr) connected downstream of the auxiliary winding (L.sub.H) in order to produce an auxiliary direct voltage (U.sub.H) for the control circuit and/or other consumers, having an auxiliary regulator (K2) to produce a second control variable (St2) for the control circuit (A) in dependence upon the deviation of the auxiliary direct voltage (U.sub.H) from a second set value (U.sub.Ref2), and having a selector circuit (AS) for priority supply of the control variable of that regulator to the control circuit (A), the actual value of which lies below the associated set value.