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:
Jul. 17, 1984
Filed:
Dec. 02, 1981
Hans-Jurgen Fahnrich, Munich, DE;
Abstract
Connected in parallel to the lamp through a fuse (10) is a triac (2) the control electrode of which is connected through a diac (3) to the tap (4) of a voltage divider likewise in parallel with the lamp. The first branch of the voltage divider contains, in addition to a fixed resistor (5), at least one variable series impedance (6) which may be either a capacitor or a voltage-dependent resistor. The second branch of the voltage divider is provided by a capacitor (7). A temperature dependent NTC resistance (8) bridges a portion of the first branch and all of the second branch of the voltage divider. For use with ballasts containing a choke, it is desirable to interpose a diode bridged by a NTC resistor in the first branch of the voltage divider adjacent to the tap. An anti-interference capacitor (9) is connected across the triac and can be replaced by a capacitive voltage divider for use with lamps of higher ignition voltage, in which case one capacitive branch of the capacitive voltage divider is bridged by a self-switching four-layer diode, to which it is possible to add a small series inductor. The starter circuit is suitable for a wide range of operating conditions of the lamp.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile