Title:
SWITCHING POWER SUPPLY AND SEMICONDUCTOR USED IN THE SWITCHING POWER SUPPLY
Document Type and Number:
Japanese Patent JP2009165316
Kind Code:
A
Abstract:
To provide a switching power supply with high precious overvoltage protection function having no malfunction.
In an overvoltage detection adjusting circuit 6 connected to an auxiliary winding 1c, a signal of an AC voltage is generated which is proportional to a voltage component obtained by removing a ringing component of the AC voltage induced in the auxiliary winding 1c, and in an overvoltage detection circuit 17, the signal for stopping on/off operation of a switching element 2 is generated to reduce an output DC voltage Vout when an overvoltage state is detected in which a peak value of the signal of the AC voltage generated by the overvoltage detection adjusting circuit 6 becomes a fixed value or more.
Inventors:
KAWABE KEITA
YAMASHITA TETSUJI
YAMASHITA TETSUJI
Application Number:
JP2008002679A
Publication Date:
July 23, 2009
Filing Date:
January 10, 2008
Export Citation:
Assignee:
PANASONIC CORP
International Classes:
H02M3/28
Attorney, Agent or Firm:
Yoshihiro Morimoto
Toshiji Sasahara
Yohei Harada
Toshiji Sasahara
Yohei Harada
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