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:
Oct. 25, 2011
Filed:
Dec. 17, 2008
Mitsuhiko Watanabe, Odawara, JP;
Chihiro Sato, Kasama, JP;
Ryoichi Oura, Hitachinaka, JP;
Hirofumi Kurimoto, Hitachinaka, JP;
Koichi Ono, Naka, JP;
Mitsuhiko Watanabe, Odawara, JP;
Chihiro Sato, Kasama, JP;
Ryoichi Oura, Hitachinaka, JP;
Hirofumi Kurimoto, Hitachinaka, JP;
Koichi Ono, Naka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A load driving and diagnosis system controls the feed and block of a load current flowing into an inductor such as a solenoid. The load driving and diagnosis system holds a counter-electromotive force, which is developed when the load current is blocked, at a voltage higher than a supply voltage so that the load current will decay for a short time. When an overcurrent condition is established in the load driving and diagnosis system because of a short circuit to a power supply, a malfunction of a circuit or destruction thereof may take place. In addition to a voltage holding means that holds a switching circuit output voltage at a predetermined voltage, a voltage holding means having a different predetermined voltage set therein is included. Moreover, a selection switch that switches the predetermined voltages according to a detected overcurrent condition is included.