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:
Apr. 23, 2002
Filed:
Mar. 26, 1999
Yasuhiro Kaneko, Saitama, JP;
NEC Corporation, Tokyo, JP;
Abstract
A charging system of a mobile telephone in which the current of lighting for the mobile telephone does not influence the control of charging of a charger using a car battery is provided. The mobile telephone provides an external connecting terminal connecting to the charger using a car battery and a battery connecting terminal connecting to a secondary battery. At the external connecting terminal of the mobile telephone, a power supply terminal for lighting is provided, the power supply to a lighting circuit of the mobile telephone is connected to either the secondary battery or the power supply terminal for lighting by a change-over switch controlled by a controller. The charger using a car battery provides a power supply for lighting besides a charging circuit. At the time when the mobile telephone is connected to the charger using a car battery, the power supply for lighting in the charger using a car battery is connected to the power supply terminal for lighting of the mobile telephone. The controller monitors the signal from a car battery mode detecting terminal, at the time when the controller detects the connection between the charger using a car battery and the mobile telephone, the controller directs the change-over switch to change the switch to the power supply terminal for lighting.