Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
POWER CONTROL DEVICE
Document Type and Number:
Japanese Patent JP2007230415
Kind Code:
A
Abstract:

To prevent the loss consumed by a current control means for performing control of a load current from exceeding an absolute rated value.

In the power control device in which an electric field effect transistor FET and a heater are connected to an on-vehicle battery in series, when a current ID flowing in the heater is gradually increased by FET (element voltage=VFET), if a heater voltage VH reaches to a first voltage V1 such that loss WD=ID×VFET of FET does not exceed allowance loss PD, i.e., a rated value, it is increased step-by-step to a second voltage V2 larger than it and thereafter VH is gradually increased again. Further, even at gradual reduction of ID, the VH is reduced step-by-step from V2 to V1. Thereby, the loss WD of FET does not exceed PD and the power of the heater can be gradually increased or decreased.

COPYRIGHT: (C)2007,JPO&INPIT


Inventors:
MIYAZAWA KAZUHIRO
KATO YUKUSHI
Application Number:
JP2006055787A
Publication Date:
September 13, 2007
Filing Date:
March 02, 2006
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
DENSO CORP
TOYOTA MOTOR CORP
International Classes:
B60R16/03; G05F1/56; H05B3/00
Attorney, Agent or Firm:
Yoji Ito
Takahiro Miura
Fumihiro Mizuno