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:
Dec. 02, 2014
Filed:
Sep. 12, 2013
Toshiba Lighting & Technology Corporation, Yokosuka, JP;
Noriyuki Kitamura, Yokosuka, JP;
Toshiba Lighting & Technology Corporation, Yokosuka-shi, Kanagawa-ken, JP;
Abstract
According to one embodiment, a detection circuit including first and second comparators and a determining unit is provided. The first comparator includes a first input terminal for inputting a first detection voltage, a second input terminal for inputting a first threshold voltage, and a first output terminal configured to output a first output signal. The second comparator includes a third input terminal for inputting a second detection voltage, a fourth input terminal for inputting a second threshold voltage higher than the first threshold voltage, and a second output terminal configured to output a second output signal. The determining unit is configured to determine the presence or absence of conduction angle control of an AC voltage and whether the conduction angle control is a phase control system or an opposite phase control system on the basis of a time difference between the first output signal and the second output signal.