Controlling apparatus for dimming level of light and controlling method of the same

1. A controlling apparatus for a dimming level of a light disposed on a ceiling surface, the controlling apparatus comprising:

a sampling unit sampling an illumination value of a ceiling area depending on a change in the dimming level of the light;

a communication unit receiving an illumination value of a floor area at a minimum dimming level of the light and an illumination value of the floor area at a maximum dimming level of the light;

an estimation unit estimating an illumination value of the floor area at a current dimming level of the light based on an algorithm defined by using the illumination value of the floor area and the illumination value of the ceiling area at the minimum dimming level of the light, the illumination value of the floor area and the illumination value of the ceiling area at the maximum dimming level of the light, and the illumination value of the ceiling area at the current dimming level of the light; and

a control unit controlling the dimming level of the light so that the estimated illumination value of the floor area and a target illumination value coincide with each other.

2. The controlling apparatus of claim 1 , wherein the sampling unit samples the illumination value of the ceiling area measured through an illumination sensor depending on the change in dimming level of the light.

3. The controlling apparatus of claim 1 , wherein the sampling unit samples the illumination value of the ceiling area depending on the change in the dimming level of the light within a predetermined dimming level range.

4. The controlling apparatus of claim 1 , wherein the communication unit acquires, from an illuminometer disposed on a floor surface, the illumination value of the floor area at the minimum dimming level of the light and the illumination value of the floor area at the maximum dimming level of the light.

5. The controlling apparatus of claim 1 , wherein the algorithm is shown as

Where a=(y1−y2)/(s1−s2), b=((y2−y1)*s2/(s1−s2))+y2, Y represents the estimated illumination value of the floor area, x represents the illumination value of the ceiling area at the current dimming level of the light, y1 represents the illumination value of the floor area at the minimum dimming level of the light, y2 represents the illumination value of the floor area at the maximum dimming level of the light, s1 represents the illumination value of the ceiling area at the minimum dimming level of the light, and s2 represents the illumination value of the ceiling area at the maximum dimming level of the light.

6. The controlling apparatus of claim 5 , wherein the control unit calculates a predicted illumination value x of the ceiling area when the estimated illumination value of the floor and the target illumination value are the same as each other by using the algorithm and decides a dimming level corresponding to the predicted illumination value by using the predicted illumination value and the illumination value of the ceiling area sampled depending on the change in the dimming level of the light.

7. The controlling apparatus of claim 1 , further comprising:

a light data management unit generating and managing light data including at least any one of the illumination value of the ceiling area depending on the change in the dimming level of the light, the illumination value of the floor area at the minimum dimming level of the light, the illumination value of the floor area at the maximum dimming level of the light, a light identifier, an illumination measurement time, and an illumination measurement period.

8. The controlling apparatus of claim 1 , further comprising:

a monitoring unit periodically monitoring whether the dimming level of the light is controlled so that the estimated illumination value of the floor area coincides with the target illumination value.

9. A controlling method for a dimming level of a light disposed on a ceiling surface, the controlling method comprising:

sampling an illumination value of a ceiling area depending on a change in the dimming level of the light;

acquiring an illumination value of a floor area at a minimum dimming level of the light and an illumination value of the floor area at a maximum dimming level of the light;

estimating an illumination value of the floor area at a current dimming level of the light based on an algorithm defined by using the illumination value of the floor area and the illumination value of the ceiling area at the minimum dimming level of the light, the illumination value of the floor area and the illumination value of the ceiling area at the maximum dimming level of the light, and the illumination value of the ceiling area at the current dimming level of the light; and

controlling the dimming level of the light so that the estimated illumination value of the floor area and a target illumination value coincide with each other.

10. The controlling method of claim 9 , wherein in the sampling of the illumination value of the ceiling area depending on the change in the dimming level of the light, the illumination value of the ceiling area measured by using an illumination sensor depending on the change in the dimming level of the light is sampled.

11. The controlling method of claim 9 , wherein in the sampling of the illumination value of the ceiling area depending on the change in the dimming level of the light by using the illumination sensor, the illumination value of the ceiling area depending on the change in the dimming level of the light is sampled within a predetermined dimming level range.

12. The controlling method of claim 9 , wherein in the acquiring of the illumination value of the floor area at the minimum dimming level of the light and the illumination value of the floor area at the maximum dimming level of the light, the illumination value of the floor area at the minimum dimming level of the light and the illumination value of the floor area at the maximum dimming level of the light are acquired by using an illuminometer.

13. The controlling method of claim 9 , wherein an algorithm is shown below, which is defined by using the illumination value of the floor area and the illumination value of the ceiling area at the minimum dimming level of the light, the illumination value of the floor area and the illumination value of the ceiling area at the maximum dimming level of the light, and the illumination value of the ceiling area at the current dimming level of the light.

Y=ax+b   [Equation 1]

Where a=(y1−y2)/(s1−s2), b=((y2−y1)*s2/(s1−s2))+y2, Y represents the estimated illumination value of the floor area, x represents the illumination value of the ceiling area at the current dimming level of the light, y1 represents the illumination value of the floor area at the minimum dimming level of the light, y2 represents the illumination value of the floor area at the maximum dimming level of the light, s1 represents the illumination value of the ceiling area at the minimum dimming level of the light, and s2 represents the illumination value of the ceiling area at the maximum dimming level of the light.

14. The controlling method of claim 13 , wherein in the controlling of the dimming level of the light so that the estimated illumination value of the floor area and a target illumination value coincide with each other, by using the algorithm, a predicted illumination value x of the ceiling area when the estimated illumination value of the floor area and the target illumination value are the same as each other is calculated and a dimming level corresponding to the predicted illumination value is decided by using the predicted illumination value and the illumination value of the ceiling area sampled depending on the change in the dimming level of the light.