BREAKDOWN PREVENTING CIRCUIT FOR ELECTRONIC DEVICE AGAINST REVERSE INSERTION OF BATTERY

Title:

BREAKDOWN PREVENTING CIRCUIT FOR ELECTRONIC DEVICE AGAINST REVERSE INSERTION OF BATTERY

Document Type and Number:

Japanese Patent JP2003339117

Kind Code:

A

Abstract:

To prevent an electronic device from breaking down, even if a battery is inserted in reverse into the electronic device.

This breakdown preventing circuit (30) for an electronic device includes a cut-off circuit for cutting off a current running through the portable electronic device (20) from the battery (10), if a battery (10) is inserted in reverse into the portable electronic device (20). Specifically, the breakdown preventing circuit (30) includes a resistor (R) with a high resistance, of which one end is connected with a positive terminal (21) of the portable electronic device (20) and an n-channel field effect transistor (FET), connected in between the other end of the resistor and a negative terminal (22) of the portable electronic device (20).

Inventors:

SAKAMOTO TOSHIKI

Application Number:

JP2002145900A

Publication Date:

November 28, 2003

Filing Date:

May 21, 2002

Export Citation:

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Assignee:

MITSUMI ELECTRIC CO LTD

International Classes:

H02J7/00; H01M2/10; H02H11/00; (IPC1-7): H02H11/00; H01M2/10; H02J7/00

Attorney, Agent or Firm:

Yosuke Goto (1 person outside)

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