| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inexpensively formed LED lighting device and illumination device, wherein a dimming signal having gradation corresponding to the degree of dimming of a light-emitting diode is input to dim the light-emitting diode by PWM control, and brightness during dimming transition of the light-emitting diode can be prevented from being coarsely digitally changed. <P>SOLUTION: The LED lighting device 1 includes: drive circuits 3 which are formed so that a PWM signal is input to dim and light light-emitting diodes 6 in accordance with the gradation degree of the PWM signal; and a PWM control circuit 4 in which the graduation of the input dimming signal is calculated into an integral multiple of two or more, and the graduation difference between the dimming signal input at this time and the dimming signal input just before is calculated, and which is formed so that the graduation degree of the PWM signal is changed by the number of times of the graduation difference stepwise and the PWM signal is output into the drive circuits 3 within one cycle time of the dimming signal. <P>COPYRIGHT: (C)2011,JPO&INPIT |
