Title:
POWER UNIT, AND DISPLAY AND ELECTRONIC APPARATUS USING THE UNIT
Document Type and Number:
Japanese Patent JP3487581
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a charge pump system of power circuit which can raise the voltage conversion efficiency and reduce the power consumption and in which the user can set the output voltage optionally.
SOLUTION: A power circuit 1 has a booster 2 which receives the input of input voltage Vin and also receives the input of a clock signal CLKA for boosting and boosts the input voltage Vin to specified output voltage Vout, a voltage dividing circuit 5 which divides the output voltage Vout of this booster 2 by resistors, a comparator 4 which compares the divided voltage Vm generated by this voltage diving circuit 5 with the control voltage Vcon and outputs the result as an output signal Vc, and a boasting controller 3 which receives the input of the output signal Vc and a clock signal VLK1 for operation from the comparator 4 and supplies the clock signal CLKA for boosting to the booster 2.
Inventors:
Koichi Kajimoto
Application Number:
JP25497299A
Publication Date:
January 19, 2004
Filing Date:
September 08, 1999
Export Citation:
Assignee:
Sharp Corporation
International Classes:
G09G3/36; G02F1/133; G09G3/20; H02M3/07; (IPC1-7): H02M3/07; G02F1/133; G09G3/20; G09G3/36
Domestic Patent References:
| JP10241388A | ||||
| JP10248240A |
Attorney, Agent or Firm:
Shusaku Yamamoto