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:
Nov. 30, 2010
Filed:
Aug. 25, 2006
Shigeru Hirata, Kyoto, JP;
Shigeru Hirata, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
In an overcurrent protection circuitaccording to the present invention, a timer circuit TMR that generates an overcurrent protection signal EN according to the results of comparison between a detection voltage Va (Vb) and VrefL and VrefH is configured as follows. When Va (Vb) has reached VrefL, the timer circuit TMR starts to count T. When Thas elapsed with Va (Vb) kept above VrefL, the timer circuit TMR changes EN to a disabled state and starts to count T. When Thas elapsed, the timer circuit TMR returns EN to an enabled state. On the other hand, after Va (Vb) has reached VrefL and Tstarts to be counted, when Va (Vb) has reached VrefH, the timer circuit TMR forcibly stops the counting of Twithout waiting for Tto elapse, changes EN to a disabled state, and starts to count T. With this configuration, it is possible to offer necessary and sufficient protection for an object to be protected (for example, a load or an element provided inside a device).