(12) United States Patent (10) Patent No.: US 8,698,406 B2 Radermacher (45) Date of Patent: Apr
USOO8698406B2 (12) United States Patent (10) Patent No.: US 8,698,406 B2 Radermacher (45) Date of Patent: Apr. 15, 2014 (54) ADAPTIVE CIRCUIT (56) References Cited (75) Inventor: Harald Radermacher, Aachen (DE) U.S. PATENT DOCUMENTS (73) Assignee: Koninklijke Philips N.V., Eindhoven 4,801,887 A 1/1989 Wegener (NL) 5,828,562 A 10, 1998 Rivet 2008/O197786 A1 8, 2008 Schaible et al. 2010/0201285 A1 8, 2010 Dellian et al. ..... ... 315,294 (*) Notice: Subject to any disclaimer, the term of this 2013/0278157 A1* 10/2013 Radermacher ..... 315, 186 patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days. FOREIGN PATENT DOCUMENTS (21) Appl. No.: 13/695,803 EP O72O237 A1 T 1996 JP 57097361 A 6, 1982 (22)22) PCT Fled:1. Mavay 5,S. 2011 * cited by examiner (86). PCT No.: PCT/B2011/051992 Primary Examiner — Anh Tran S371 (c)(1), (74) Attorney, Agent, or Firm — Mark L. Beloborodov (2), (4) Date: Nov. 2. 2012 (57) ABSTRACT (87) PCT Pub. No.: WO2011/141856 The invention describes an adaptive circuit (1,1) for driving a lower-voltage DC load (2) from a rectified higher-voltage PCT Pub. Date: Nov. 17, 2011 AC supply (3), which adaptive circuit (1, 1') comprises a O O charge-storage circuit (21, 21'), which charge storage circuit (65) Prior Publication Data (21, 21') comprises a first capacitor (C1) and a second capaci US 2013/OO49618 A1 Feb. 28, 2013 tor (C2) connected essentially in series, wherein the second capacitor (C2) is connected at least in parallel with the load (30) Foreign Application Priority Data (2); and an active switch (22, 22") realized as a controlled current source (22, 22") for controlling a load current (I) May 14, 2010 (CN) .........................
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