Title:
PWM CONTROL DEVICE, POWER SUPPLY DEVICE AND LUMINAIRE
Document Type and Number:
Japanese Patent JP2015220537
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a PWM control device, a power supply device and a luminaire that can suppress output of a PWM signal having an unexpected duty ratio when the duty ratio of the PWM signal is varied.SOLUTION: A PWM control device 10 has a detection circuit 1, a first output circuit 2, a second output circuit 3, a control circuit 4 and an AND circuit 5. The control circuit 4 alternately varies a first threshold value and a second threshold value. When the first threshold value is varied, the control circuit 4 varies the first threshold value for a first predetermined period for which the output level V1 of a first PWM signal is fixed to a high level. After the first threshold value is varied and the first predetermined period is terminated, the control circuit 4 fixes the output level V2 of a second PWM signal to a high level. When the second threshold value is varied, the control circuit 4 varies the second threshold value for a second predetermined period for which the output level V2 is fixed to the high level. After the second threshold value is varied and the second predetermined period is terminated, the control circuit 4 fixes the output level V1 to the high level.
Inventors:
TAKEDA TERUHITO
Application Number:
JP2014101597A
Publication Date:
December 07, 2015
Filing Date:
May 15, 2014
Export Citation:
Assignee:
PANASONIC IP MAN CORP
International Classes:
H03K7/08; H02M7/06
Domestic Patent References:
| JP5174529B2 | 2013-04-03 | |||
| JP2008193436A | 2008-08-21 | |||
| JP2001016081A | 2001-01-19 | |||
| JP2010056594A | 2010-03-11 |
Foreign References:
| US20080079407A1 | 2008-04-03 | |||
| US20110221541A1 | 2011-09-15 |
Attorney, Agent or Firm:
Keisei Nishikawa