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:
Apr. 23, 2002
Filed:
Oct. 18, 2000
Peter Langer, Lexington, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
A pulse width modulated driver is provided for driving a load such as a halogen bulb, at a reduced voltage level. The driver includes a switch selectively opening and closing to apply a pulse width modulated signal V to a high voltage end of the load The switch operates responsive to a switch control signal V . The driver further includes a duty cycle control circuit generating the switch control signal V when an input operational voltage V is above a threshold voltage level. Finally, the driver includes an energy storage circuit for storing electrical energy when the switch is open to maintain the input operational voltage V above the threshold voltage level. The driver is connected on a high side of the load and does not require a separate line connected to system ground.