| US 7,592,753 B2 | ||
| Inductively-powered gas discharge lamp circuit | ||
| David W. Baarman, Fennville, Mich. (US); and Scott A. Mollema, Rockford, Mich. (US) | ||
| Assigned to Access Business Group International LLC, Ada, Mich. (US) | ||
| Filed on Jan. 08, 2007, as Appl. No. 11/620,859. | ||
| Application 11/620859 is a continuation in part of application No. 10/689499, filed on Oct. 20, 2003, granted, now 7,212,414. | ||
| Application 10/689499 is a continuation in part of application No. 10/689148, filed on Oct. 20, 2003. | ||
| Application 10/689148 is a continuation in part of application No. 10/175095, filed on Jun. 18, 2002, granted, now 6,673,250, filed on Jan. 06, 2004. | ||
| Application 10/175095 is a continuation in part of application No. 09/592194, filed on Jun. 12, 2000, granted, now 6,436,299, filed on Aug. 20, 2002. | ||
| Claims priority of provisional application 60/444794, filed on Feb. 04, 2003. | ||
| Claims priority of provisional application 60/140159, filed on Jun. 21, 1999. | ||
| Claims priority of provisional application 60/140090, filed on Jun. 21, 1999. | ||
| Prior Publication US 2007/0145909 A1, Jun. 28, 2007 | ||
| Int. Cl. H05B 41/16 (2006.01) | ||
| U.S. Cl. 315—274 [315/224; 315/209 R; 315/219; 315/312] | 18 Claims |
| 1. An inductive power supply system for an inductively powered gas discharge lamp assembly comprising:
a primary having a tank circuit operable at a pre-heat frequency and an operating frequency, said primary having a resonant
frequency controller for selectively varying a resonant frequency of said tank circuit;
a lamp having a first electrode and a second electrode spaced apart within a gas;
a secondary coil electrically connected to said first electrode and said second electrode;
a first capacitor connected in series between said first electrode and said second electrode; and
wherein said first capacitor has characteristics selected such that an electrical flow path through said first capacitor has
a lesser impedance than an electrical flow path through said gas when power is applied to the secondary circuit at a pre-heat
frequency, and such that said electrical flow path through said first capacitor has a greater impedance than said electrical
flow path through said gas when power is applied to the secondary circuit at an operating frequency.
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