Title:
温度検出回路
Document Type and Number:
Japanese Patent JP4818971
Kind Code:
B2
Abstract:
A PWM signal generation circuit in an IPM includes an amplification circuit amplifying a voltage across terminals of a temperature sensor, a comparison circuit generating a PWM signal based on a triangular wave signal and an output signal of the amplification circuit, and a correction circuit setting an amplification ratio of the amplification circuit such that a pulse width of the PWM signal is set to a reference pulse width in an adjustment mode in which a switching element is caused to have a reference temperature. Consequently, characteristic variations in the temperature sensor, the amplification circuit, and the like can be corrected, and the temperature of the switching element can be detected with high accuracy.
Inventors:
Toshiyuki Kumagai
Application Number:
JP2007088108A
Publication Date:
November 16, 2011
Filing Date:
March 29, 2007
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G01K7/01; G01K15/00
Domestic Patent References:
| JP2007336728A | ||||
| JP2003149055A | ||||
| JP2005016992A |
Attorney, Agent or Firm:
Kuro Fukami
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai