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:
Feb. 15, 2011
Filed:
May. 29, 2006
Protection circuit, and semiconductor device and light emitting device using such protection circuit
Mitsuru Okazaki, Kyoto, JP;
Naoki Takahashi, Kyoto, JP;
Akira Shimizu, Kyoto, JP;
Kenichi Nakata, Kyoto, JP;
Mitsuru Okazaki, Kyoto, JP;
Naoki Takahashi, Kyoto, JP;
Akira Shimizu, Kyoto, JP;
Kenichi Nakata, Kyoto, JP;
Rohm Co., Ltd., , JP;
Abstract
In a protection circuit connected, via lines including an inductance component, to a circuit to be protected, a first transistor is arranged on a path to ground from a connection point of the protection circuit and the line. A second transistor is arranged on a path to ground from a connection point of the circuit to be protected and the line, and extracts, from a connection point, a current corresponding to a current flowing in the first transistor. The first and the second transistors are NPN bipolar transistors having a base and an emitter are commonly connected. A resistor is connected between the base and the emitter of the first transistor, and a diode is connected between the base and a collector.