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:
Jun. 06, 2017
Filed:
Feb. 22, 2012
Yasuhisa Ueda, Osaka, JP;
Toshiaki Isogai, Osaka, JP;
Kazushige Sugita, Hyogo, JP;
Abstract
A lighting circuit () includes a controller integrated circuit (U) for on and off control of a switching element (Q), a transformer (T) having a primary coil (T) that is connected in series to the switching element and a secondary coil (T), a first voltage supply circuit supplying a voltage that occurs across both ends of the primary coil to an LED module (), and a second voltage supply circuit supplying a voltage induced in the secondary coil to a power source terminal (Vcc) when the switching element is on. A turns ratio N of the primary coil to the secondary coil satisfies Equation 1, where X1 V denotes a voltage that an AC power source supplies, Y V denotes the maximum value of a power source voltage of the control unit at which normal operation is guaranteed, and Z V denotes the minimum value of the power source voltage.