Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
DUTY RATIO MEASURING CIRCUIT, LIGHTING DEVICE, AND ILLUMINATOR
Document Type and Number:
Japanese Patent JP2010226658
Kind Code:
A
Abstract:

To accurately measure the duty ratio of a light adjusting signal even when the frequency etc. of the light adjusting signal is different.

A signal transmission circuit 152 receives a light adjusting signal subjected to pulse width modulation and transmits the received light adjusting signal. A cycle measuring part 162 measures the cycle of the light adjusting signal transmitted by the signal transmission circuit 152. An ON-time measuring part 161 measures the ON-time of the light adjusting signal transmitted by the signal transmission circuit 152. A correction-value calculation part 164 calculates a correction value for the transmission characteristics of the signal transmission circuit 152. A duty-ratio calculation part 165 calculates a duty ratio based on the cycle measured by the cycle measuring part 162, the ON-time measured by the ON-time measuring part 161, and the correction value calculated by the correction value calculation part 164.


Inventors:
NISHIKAWA HIROAKI
SHIBATA KOJI
EGUCHI KENTARO
Application Number:
JP2009074393A
Publication Date:
October 07, 2010
Filing Date:
March 25, 2009
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
MITSUBISHI ELECTRIC CORP
MITSUBISHI ELEC LIGHTING CORP
International Classes:
H03K9/02; H05B37/02; H05B41/392; H02M7/48
Attorney, Agent or Firm:
Shoji Mizoi
Yoshihisa Yamazaki