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. 02, 2009
Filed:
Mar. 08, 2007
Shinichiro Nakata, Takahama, JP;
Hiroyuki Ban, Hazu-gun, JP;
Satoshi Ichikawa, Gamagori, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
An input protection circuit comprises a reverse flow preventing diode, a series circuit of a diode and a Zener diode, and a current path forming resistor or diode. The reverse flow preventing diode is connected between an input terminal and an internal circuit. The series circuit is connected between the input terminal and a ground. The current path forming resistor or diode is connected between a first common connection point of the reverse flow preventing diode and the internal circuit and a second common connection point of the series circuit, and sets a potential at the first common connection point to be less than a potential at the input terminal when the surge voltage is applied to the input terminal.