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:
Oct. 13, 1987
Filed:
Jul. 28, 1986
Dale E Folwell, Placentia, CA (US);
Howard Handler, Westminster, CA (US);
Intelite Inc., Placentia, CA (US);
Abstract
A high frequency ballast circuit powered by a dc input voltage source for starting and operating a gas discharge lamp load, comprising: a means for providing drive signals, each the drive signal having a first and second state, a series switch having a conduction channel having a first and second terminal, the series switch having a control terminal responsive to the drive signals, the conduction channel is on (conductive) in responsive to the interval characterized by the first state of the drive signal and off (non-conductive) in response to a drive signal having a second state, and an inductor. A clamp diode is included. The inductor is coupled to the clamp diode cathode and to the series switch. A ballast reactance is included with a a power oscillator circuit, the power oscillator circuit has a transformer having, a primary winding having a first, a second and a center-tap terminal, a drive winding having a first and a second and a center-tap terminal, and an output winding. A reactance tunning means coupled between the transformer primary winding first and second terminal, a first and second drive switch, the primary winding first terminal is coupled to the first drive switch, the primary winding second terminal is coupled to the second drive switch, and the primary winding center-tap is coupled to the inductor; the drive winding first and second terminal are respectively coupled to the first and second a switch control terminals. A boost circuit means, and a timer circuit operating from the boost circuit means power, and means for adjusting the duty cycle ratio of the timer circuit.