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. 12, 2013
Filed:
Apr. 21, 2010
Junming Zhang, Hangzhou, CN;
Jiali Cai, Hangzhou, CN;
Lei Du, Hangzhou, CN;
Yuancheng Ren, Hangzhou, CN;
Eric Yang, Saratoga, CA (US);
Junming Zhang, Hangzhou, CN;
Jiali Cai, Hangzhou, CN;
Lei Du, Hangzhou, CN;
Yuancheng Ren, Hangzhou, CN;
Eric Yang, Saratoga, CA (US);
Monolithic Power Systems, Inc., San Jose, CA (US);
Abstract
A circuit for controlling the switch frequency of an inverter that strikes and drives fluorescent lamps is disclosed. The circuit comprises a frequency generator and an offset circuit. The offset circuit provides a current signal in response to the lamp status. The frequency generator provides a frequency control signal in respond to the current signal so as to control the switch frequency of the inverter. When the lamp is open, the switch frequency of the inverter is higher; when the lamp is lighted, the switch frequency of the inverter is lower.