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. 09, 1991
Filed:
Apr. 13, 1989
Kozo Tamura, Hitachi, JP;
Toshiharu Kodato, Hitachi, JP;
Syoichi Nihira, Hitachi, JP;
Yasuhiro Tsukamoto, Hitachi, JP;
Akira Iida, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Tagasangyo, Ltd., Hitachi, JP;
Abstract
A charging circuit comprises a main circuit for charging a battery and a power unit connected to an electric power source. The main circuit and the power unit are connected through a connector to each other. The power source transformed by a transformer located at the power unit is supplied to the connector through a contact of a direct current relay. After alternating current is introduced to the main circuit from the power unit, the alternating current is rectified by a diode bridge. The direct current from the diode bridge is supplied to the battery through a control circuit. When the battery is charged sufficiently, the control circuit outputs an instruction signal to a diode portion of a photo-triac connected between an output terminal of the diode bridge and the control relay. When the instruction signal is transmitted to the diode portion, a triac portion of the photo-triac, which is connected between one of an input terminal of the diode bridge and the connector, outputs another instruction signal to the relay located at the power unit for opening the contact through the connector.