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:
May. 28, 2002
Filed:
Sep. 28, 2000
Hirokazu Itakura, Aichi-ken, JP;
Junichi Nagata, Okazaki, JP;
Denso Corporation, Kariya, JP;
Abstract
A load actuation circuit is provided which is capable of placing a limit on load current to a load below a predetermined value with high accuracy. In the load actuation circuit, a series circuit comprising a detection transistor and an NPN transistor is connected in parallel with an output transistor for supplying a load current to the load, and a diode is placed between the gates of the output transistor and the detection transistor for producing a voltage drop equal to a voltage drop in the NPN transistor. In addition, a constant-current circuit for supplying a constant current is connected to the gate of the detection transistor, and another transistor for constituting a current mirror circuit together with the NPN transistor is connected to the gate of the output transistor. This circuit arrangement prevents a limit value of the load current from fluctuating due to the non-uniformity of circuit elements or the like, thus achieving high-accuracy load-current limitation.