Title:
POWER SUPPLY, DISCHARGE LAMP LIGHTING UNIT AND LIGHTING FIXTURE
Document Type and Number:
Japanese Patent JP3486883
Kind Code:
B2
Abstract:
PURPOSE: To prevent the input current from an AC power supply from being distorted through simple circuitry without causing any trouble in the output circuit.
CONSTITUTION: An output control circuit 23 delivers oscillation signals a1, b1 to first and second switching means 21, 22 which are thereby turned ON/OFF alternately and the ON duty ratio thereof is controlled based on the output voltage from a rectifier circuit 12. At the time of deep dimming, the output control circuit 23 decreases the ON/OFF frequency of the first and second switching means 21, 22 and increases the ON duty ratio of the second switching means 22. Consequently, the input current from an AC power supply can be prevented from being distorted through simple circuitry without causing any trouble in the output circuit.
Inventors:
Tsutomu Kakitani
Noriyuki Kitamura
Yuji Takahashi
Keiichi Shimizu
Noriyuki Kitamura
Yuji Takahashi
Keiichi Shimizu
Application Number:
JP7695695A
Publication Date:
January 13, 2004
Filing Date:
March 31, 1995
Export Citation:
Assignee:
Toshiba Lighting & Technology Corporation
International Classes:
H05B41/24; H02M7/48; H05B41/392; (IPC1-7): H02M7/48; H05B41/24; H05B41/392
Domestic Patent References:
| JP61218095A | ||||
| JP6310293A | ||||
| JP6163166A | ||||
| JP6283286A |
Attorney, Agent or Firm:
Susumu Ito