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:
Jan. 05, 2010
Filed:
Dec. 29, 2006
Bruce Roberts, Mentor on the Lake, OH (US);
Tony Aboumrad, Parma, OH (US);
Bruce Roberts, Mentor on the Lake, OH (US);
Tony Aboumrad, Parma, OH (US);
General Electric Company, Schenectady, NY (US);
Abstract
A new ballast circuit for automotive high intensity discharge (HID) applications is disclosed. The ballast utilizes two DC/DC converters and two low frequency inverter switches. The ballast also includes an integrated high voltage ignition circuit. The positive DC/DC converter builds up a high ignition voltage in addition to raising the DC position bus. When the lamp breaks down, the DC bus voltage decreases and the ignition circuit falls inactive. The DC/DC stages are then alternately conductive to supply power to the lamp via the low frequency inverter switches. The disclosed ballast reduces the number of the switches used to four from a typical six, it utilizes independently controlled voltage source, and provides a more efficient run-up voltages waveform during pre-steady state running of the lamp.