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. 26, 2000
Filed:
May. 18, 1999
Applicant:
Inventors:
Richard Anthony Lakin, Bishop Auckland, GB;
Isaac David Gurwicz, Gateshead, GB;
Assignee:
Micro Tech Limited, Gateshead, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
315291 ; 3152 / ; 315308 ; 315224 ;
Abstract
A lamp driver circuit for a discharge lamp in which a high frequency is used to initiate a discharge and a lower frequency is used to sustain the discharge. A tuned circuit boosts the voltage at the starting frequency. In addition, a transformer is connected to the tuned circuit to provide a further boost to the starting voltage. The transformer core may be made of a different material from that of the inductor of the tuned circuit, and is preferably selected to saturate during starting, to enhance the voltage spikes available for starting the lamp.