Title:
The LED drive circuit for flashes, and electronic equipment provided with it
Document Type and Number:
Japanese Patent JP5995280
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an LED drive circuit for flash having excellent transition responsiveness from low current driving to flash current driving and having high efficiency.SOLUTION: The LED drive circuit for flash includes: a booster circuit whose input voltage is voltage of a battery; an electric double layer capacitor that is charged by the booster circuit and drives an LED element with an output current; a step-down circuit whose input power supply is the electric double layer capacitor and whose output is a cathode side of the LED element; and a power switch element for feeding a large current to the LED element.
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Inventors:
Yoshinori Ikuta
Application Number:
JP2012242351A
Publication Date:
September 21, 2016
Filing Date:
November 02, 2012
Export Citation:
Assignee:
Sharp Corporation
International Classes:
H02M3/155; G03B15/02; G03B15/03; G03B15/05; H04N5/225
Domestic Patent References:
| JP2007108192A | ||||
| JP2012075201A |
Attorney, Agent or Firm:
Shizuo Sano
Inoue On
Inoue On