Apparatus for controlling lamp and method thereof
Disclosed are apparatus for controlling a lamp and a method thereof. The apparatus for controlling a lamp includes an information collection device that receives light amount information and temperature information of LED chips, which correspond to a plurality of LED boards, respectively, from the plurality of LED boards through one port, and a controller that controls a driving current for driving the LED chip based on the light amount information of the LED chip or the temperature information of the LED chip.
1. An apparatus for controlling a lamp, comprising:
an information collection device configured to receive, from a plurality of LED boards respectively having a plurality of LED chips, light amount information and temperature information of the plurality of LED chips; and
a controller configured to control a driving current for driving the plurality of LED chips based on the light amount information or the temperature information of the plurality of LED chips,
wherein the information collection device comprises:
a first information collection device having a port and configured to sequentially receive, via the port of the first information collection device, the light amount information of the plurality of LED chips; and
a second information collection device having a port and configured to sequentially receive, via the port of the second information collection device, the temperature information of the plurality of LED chips.
2. The apparatus of claim 1 , wherein:
the light amount information includes a voltage value across both ends of a BIN resistor included in each of the plurality of LED boards, and
the controller is configured to calculate a resistance value of the BIN resistor based on the voltage value and identify a light amount of the LED chip to control the driving current.
3. The apparatus of claim 2 , wherein the controller is configured to calculate the resistance value of the BIN resistor based on the voltage value at both ends of the BIN resistor included in each of the plurality of LED boards.
4. The apparatus of claim 1 , wherein:
the temperature information includes a voltage value across both ends of a thermal resistor included in each of the plurality of LED boards, and
the controller is configured to calculate a resistance value of the thermal resistor based on the voltage value and identify a temperature of the LED chip to control the driving current.
5. The apparatus of claim 4 , wherein the thermal resistor includes an NTC thermistor having a resistance decreasing when an ambient temperature rises.
6. The apparatus of claim 4 , wherein:
the controller is configured to alternately and repeatedly monitor the voltage value across both ends of the thermal resistor included in each of the plurality of LED boards, and
identify the temperature of the LED chip to control the driving current when the temperature of the LED chip attains a threshold value.
7. The apparatus of claim 6 , wherein the controller is configured to obtain the voltage value across both ends of the thermal resistor after a stabilization time has lapsed.
8. The apparatus of claim 6 , wherein the controller is configured to shorten a period for monitoring the voltage value across both ends of the thermal resistor when the temperature of the LED chip closely approaches the threshold value.
9. A method of controlling a lamp, comprising:
receiving, from a plurality of LED boards respectively including a plurality of LED chips, light amount information and temperature information of the plurality of LED chips; and
controlling a driving current for driving the plurality of LED chips based on the light amount information of the LED chip or the temperature information of the plurality of LED chips,
wherein receiving the light amount information and the temperature information includes:
sequentially receiving, via a port of a first information collection device, the light amount information of the plurality of LED chips; and
sequentially receiving, via a port of a second information collection device, the temperature information of the plurality of LED chips.
10. The method of claim 9 , wherein controlling the driving current includes identifying a light amount of the LED chip after calculating a resistance value of a BIN resistor based on the voltage value across both ends of the BIN resistor included in each of the plurality of LED boards.
11. The method of claim 10 , wherein controlling the driving current includes
calculating the resistance value of the BIN resistor based on the voltage value at both ends of the BIN resistor included in each of the plurality of LED boards.
12. The method of claim 9 , wherein receiving the light amount information and the temperature information of the LED chips includes
controlling the driving current to identify a temperature of the LED chip after calculating a resistance value of a thermal resistor based on a voltage value across both ends of the thermal resistor included in each of the plurality of LED boards.
13. The method of claim 12 , wherein controlling the driving current for driving the LED chip includes:
alternately and repeatedly monitoring the voltage value across both ends of the thermal resistor included in each of the plurality of LED boards; and
identifying the temperature of the LED chip to control the driving current when the temperature of the LED chip attains a threshold value.
14. The method of claim 13 , wherein controlling the driving current for driving the LED chip includes obtaining the voltage value across both ends of the thermal resistor after a stabilization time has lapsed.
15. The method of claim 13 , wherein controlling the driving current for driving the LED chip includes shortening a period for monitoring the voltage value across both ends of the thermal resistor when the temperature of the LED chip closely approaches the threshold value.