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Patent Searching and Data


Title:
ELECTRONIC DEVICE
Document Type and Number:
Japanese Patent JP2008206349
Kind Code:
A
Abstract:

To provide an electronic device with a simple circuit structure capable of handling various problems such as back-flow prevention in a charging input section, overvoltage input, connection among a plurality of charging power supply sources and breakage of a charging control circuit.

Priority is previously determined among input contacts 1 to 3 connected to chargers. When a plurality of chargers are concurrently connected to the input contacts, a high-priority charging input 1 detection 52 inhibits an AND gate 54 and an AND gate 57, turns off transistors 14, 15 and inhibits charging from lower-priority chargers. Under abnormal conditions, any detection among the overvoltage 1 detection 53, the overvoltage 2 detection 56 and the overvoltage 3 detection 59 of the respective input contacts, or the overcharging detection 62 of a battery voltage 32a inhibits all AND gates 51, 54, 57, turns off transistors 13 to 15 and inhibits charging from all chargers. The transistors 13 to 15 with a small voltage drop prevent back-flow.


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Inventors:
ISHII TAKAAKI
Application Number:
JP2007041218A
Publication Date:
September 04, 2008
Filing Date:
February 21, 2007
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
H02J7/00; H01M10/44; H02H7/18; H02H11/00
Attorney, Agent or Firm:
Hiroshi Horiguchi