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. 04, 2002
Filed:
Apr. 02, 2001
Kazumasa Ohya, Utsunomiya, JP;
NEC Tokin Tochigi, Ltd., Utsunomiya, JP;
Abstract
The present invention provides a mutual connection judging circuit for judging mutual connection between a device with an incorporated battery and a charger wherein there are provided transistors Q and Q on the charger side and the device side respectively, bases of the transistors Q and Q on the charger side and the device side are connected with each other, and mutual connection is judged by collector potential of the transistors Q and Q The charger controls the charging by judging mutual connection depending upon whether the collector of the PNP transistor Q is in opened state or not. The device comprises a circuit Q for controlling emitter potential of the NPN transistor Q , controls emitter potential depending upon whether the charging is in enable state or not, and turns on or off the NPN transistor Q and the charger starts the charging by judging collector potential of the PNP transistor Q . With the features of construction as described above, the mutual connection can be confirmed by a single signal line, and it is possible to control connection signal from the device side.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile