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:
Feb. 20, 2001
Filed:
Mar. 27, 2000
Hubertus C. Miermans, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A switched-mode power supply with a burst mode comprises an integrated circuit (Ic) with a minimal number of terminals. The integrated circuit (Ic) comprises a switching element (S) for periodically switching on and off the current (Id) in a primary winding (Lp) of a transformer (T), and a control circuit (Cc) for controlling the on and off-switching of the switching element (S). The integrated circuit (Ic) has three terminals (T,, T,, T,). A main current path of the switching element (S) is arranged between two of the terminals (T,, T,). A capacitor (C,) is connected to the third terminal (T,). A capacitor voltage (Vc) across the capacitor (C,) is used as power supply voltage for the control circuit (Cc). A feedback circuit (Fb) has an input connected to a DC output voltage (Vout) supplied by a secondary winding (Ls) of the transformer (T), and an output connected to the third terminal (T,). The control circuit (Cc) further receives the capacitor voltage (Vc) for periodically switching said main current path on and off when the capacitor voltage (Vc) is in a first range indicating that the power supply voltage (Vout) is lower than the predetermined value (Vp), and for keeping said main current path in a non-conductive state when said capacitor voltage (Vc) is in a second range indicating that the power supply voltage (Vout) exceeds the predetermined value (Vp).