Patent ID: 8698425
Filing Date: 2014-04-15
Classification: H05B,Y02B

Abstract:
1. An LED lighting device comprising: a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually; and a control circuit for generating first and second switching control signals based on a chromaticity control signal and a luminance control signal, and executing a cyclic light/quench control of the first light-emitting unit and the second light-emitting unit so as to have a lighting period and a quenching period for lighting/quenching the first light-emitting unit and the second light-emitting unit, according to the generated first and second switching control signals, and for generating a pulse number modulation output signal based on the chromaticity control signal and the luminance control signal, and executing a light control of the first light-emitting unit and the second light-emitting unit by a pulse number modulation control according to the first and second switching control signals on which the generated pulse number modulation output signal is superimposed, wherein the control circuit comprises a first driving circuit for output the first switching control signal, and a second driving circuit for output the second switching control signal.