| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a power supply circuit of simple structure which can control dimming and emission color of a light emitting element, and to provide a lighting system. <P>SOLUTION: The power supply circuit includes: a direct current power generating means for generating direct current power to supply the power to a plurality of semiconductor light emitting elements; an external signal receiving means 160 for receiving an external signal having a variable frequency and a variable duty ratio; a control means 170 for generating a control signal for controlling the current, which flows in the semiconductor light emitting elements, based on the external signal received by the external signal receiving means; and a plurality of current control means for separately controlling the current, which flows in each of the semiconductor light emitting elements, based on the control signal generated by the control means. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
