Title:
PROTECTION CIRCUIT FOR REGULATOR AND POWER UNIT EQUIPPED WITH THE SAME
Document Type and Number:
Japanese Patent JP3732190
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To offer a power unit which can lessen the malfunction of a load being the output supply destination of a regulator due to the repetition of the detection and cancel of an overvoltage.
SOLUTION: The power unit comprises a regulator 1 and a protection circuit 2 for a regulator. An overvoltage detecting circuit 3 within the protection circuit 2 for a regulator switches off the regulator 1 when it detects the overvoltage. An overvoltage detection frequency judging circuit 4 within the protection circuit 2 for a regulator judges whether overvoltage is detected a specified number of times within a specified time or not based on the output of the overvoltage detecting circuit 3. An overvoltage detection level setting circuit 5 within the protective circuit for a regulator lowers the detection level of the overvoltage detecting circuit 3 when overvoltage is detected a specified number of times within a specified time by the overvoltage detection frequency judging circuit 4.
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Inventors:
Masahito Kondo
Koichi Inoue
Koichi Inoue
Application Number:
JP2003136125A
Publication Date:
January 05, 2006
Filing Date:
May 14, 2003
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H02H5/04; H02M3/00; G05F1/56; H02H1/04; H02H3/20; H02H7/12; H02H7/20; (IPC1-7): H02M3/00; G05F1/56; H02H5/04; H02H7/20
Domestic Patent References:
| JP2003033015A | ||||
| JP2002145022A | ||||
| JP9191647A |
Attorney, Agent or Firm:
Shizuo Sano
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