KR100609124B1 - White led system with active heat controller and its control method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white LED lamp system for lighting having an active thermal controller and a control method thereof, and more particularly, to convert an AC power supplied from the outside into a driving power for driving a white LED lamp and to output the same. A power converter unit outputting a thermal control power corresponding to the input; A white LED lamp provided with a thermal controller of a thermoelectric cooling element which receives a driving power from the power converter unit and drives white light, and receives a thermal control power from the power converter unit and actively performs a thermal control function; And receiving the voltage and current applied to the white LED lamp through feedback, comparing the received voltage and current with a preset parameter, measuring the current temperature of the white LED lamp, and then applying a corresponding thermal control drive signal. Characterized in that it consists of a thermal control unit for outputting to the power converter unit, this invention has an excellent effect that can implement a light output and color rendering of a stable and constant white light irrespective of the change in the ambient temperature.

White LED Lamp, Power Converter Unit, Thermal Control Unit, Thermoelectric Cooling Element, Thermoelectric Generator

Description

White LED lamp system for lighting with active thermal controller and its control method {WHITE LED SYSTEM WITH ACTIVE HEAT CONTROLLER AND ITS CONTROL METHOD}             

1 is a graph showing the brightness characteristics of the LED according to the change of the ambient temperature,

2 is a cross-sectional view schematically showing a conventional LED structure,

3 is a functional block diagram showing a white LED lamp system for lighting having an active thermal controller according to an embodiment of the present invention;

4 is a cross-sectional view for schematically illustrating a structure of a white LED lamp according to FIG. 3;

5 is a schematic diagram illustrating an arrangement pattern of an LED chip in a structure of a white LED lamp according to FIG. 3;

6 is a graph showing a change characteristic of the voltage-current curve of the LED with temperature;

7 is an operation flowchart showing a control method of a white LED lamp system for lighting having an active thermal controller according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: power inverter unit 200: white LED lamp

201: lead frame 202: electrode pattern

203: LED chip (R, G, B) 210: thermal controller (thermoelectric cooling element)

211: low temperature part 212: high temperature part

220: thermoelectric generator 221: low temperature part

222: high temperature unit 300: heat control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white LED lamp system for lighting having an active thermal controller and a control method thereof, and more particularly, to maintain a constant light output characteristic changed by an external ambient temperature when driving a white LED lamp for lighting. The present invention relates to a lighting white LED lamp system and control method having an active thermal controller that enables to maintain a constant driving temperature of an LED in an optimal state through efficient control of heat absorption and heat dissipation using an active thermal controller.

In general, LEDs (Light-Emitting Diodes) have been commercialized in 1962 as red LEDs using GaAsP compound semiconductors. It has been used as an image light source. Since the mid-90s, potassium nitride (GaN) blue LEDs have been developed to enable full-color display using LEDs. These LEDs are representative of cell phone LCDs and back-lights for keypads. In addition, it is used in various places such as outdoor full color large display boards, traffic signals, automobile dashboards, ports, airports, warnings and induction lamps in high-rise buildings.

In addition, as the luminous efficiency of the blue and green LEDs of the nitride semiconductor series and the red and amber LEDs using InGaAlP is rapidly increasing, efforts to use as illumination beyond the conventional display-oriented range of use are rapidly spreading all over the world. to be.

In order to apply these LEDs to general lighting, first, white light must be implemented using LEDs.How to implement white LEDs is to create white light using phosphors on blue LEDs or ultraviolet LEDs, a method using complementary colors, and A method of implementing white light by combining red, green, and blue, which are three primary colors, has been developed and used. The present invention belongs to the field of implementing white light by combining red, green, and blue among the white light implementation methods.

Conventional methods for implementing white light for illumination through a combination of red, green and blue LEDs, as shown in Figure 2, the LED chip 1, the lens 2, and the electrode (3) for supplying power 4) and the LED including the radiator 5 and the body 6 are combined into three colors of three primary colors of red, green, and blue to realize white light.

When the white light is to be implemented by using the combination of the conventional three-color LED as described above, as shown in FIG. 1, the light output of the red, green, and blue LEDs for implementing the white light is changed according to the change of the ambient temperature. As it changes, the simple radiator structure of the LED as shown in FIG. 2 makes it difficult to efficiently control the change in the ambient temperature, and thus, the light efficiency and color rendering of the white light through the combination of red, green, and blue LEDs are reduced. There was a problem with limitations to be used.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a plurality of red, green, and blue LED chips in various structures in which serial, parallel, or parallel-parallel is mixed on a lead frame. White LED lamp system for lighting with active thermal controller to realize efficient white light and active heat control according to brightness characteristics according to ambient temperature of each LED chip to realize constant light output and color rendering of white light. And a control method thereof.

Another object of the present invention is to combine the thermoelectric power generation element with the thermoelectric power generation element used for active heat control to generate a high temperature heat that is discarded as waste heat to feed back the current generated to the power converter unit efficiency of the overall system It is to provide a white LED lamp system for lighting and a control method thereof to further improve the performance.

In order to achieve the above object, the lighting white LED lamp system having an active thermal controller of the present invention converts AC power supplied from the outside into driving power for driving a white LED lamp, and outputs a thermal control drive signal. A power converter unit outputting a thermal control power corresponding to the input;

A white LED lamp provided with a thermal controller of a thermoelectric cooling element which receives a driving power from the power converter unit and drives white light, and receives a thermal control power from the power converter unit and actively performs a thermal control function; And

The voltage and current applied to the white LED lamp are input through feedback, and the current temperature of the white LED lamp is measured by comparing the received voltage and current with a predetermined parameter, and then the corresponding thermal control drive signal is read. Characterized in that the heat control unit for outputting to the power converter unit.

On the other hand, the control method of the white LED lamp system for lighting having an active thermal controller according to the present invention, the heat control unit is supplied with driving power from the power converter unit voltage, current applied to drive the LED from the white LED lamp which is emitting white light Receiving a first step through the feedback;

A second step of measuring the current temperature of the white LED lamp by comparing the voltage and current received by the thermal controller with a preset parameter;

A third step of the thermal control unit outputting a thermal control driving signal for active thermal control corresponding to the power conversion unit based on the measured current temperature of the white LED lamp;                         

A fourth step of supplying, by the power converter, a thermal control power corresponding to a thermal control driving signal received from a thermal control unit to the thermal controller of the white LED lamp; And

The thermal controller is driven by the thermal control power supplied from the power converter unit to absorb the abnormal high temperature heat generated by the white LED lamp and is characterized in that the fifth step is repeated in sequence.

Hereinafter, a lighting white LED lamp system having an active thermal controller according to an embodiment of the present invention and a control method thereof will be described in detail with reference to the accompanying drawings.

Figure 3 is a functional block diagram showing the configuration of a white LED lamp for lighting having an active thermal controller according to an embodiment of the present invention, the white LED lamp system for lighting with an active thermal controller according to an embodiment of the present invention It is largely comprised of the inverter part 100, the white LED lamp 200 in which the heat controller 210 was installed, and the heat control part 300. FIG.

The power converter 100 converts AC power supplied from the outside into a drive power for driving the white LED lamp 200 and outputs the same to the white LED lamp 200, while the thermal controller When the thermal control drive signal is received from the 300, the thermal control power corresponding to the thermal control drive signal is output to the thermal controller 210.

In addition, the white LED lamp 200 serves to generate a white light that can be used for lighting by driving the driving power from the power converter 100.

In this case, the thermal controller 210 installed in the white LED lamp 200 is driven by receiving a thermal control power from the power converter 100, and generated in the white LED lamp 200 according to the change of the ambient temperature. Absorbs heat of abnormal temperature and releases it to the outside.

Here, the specific configuration of the white LED lamp 200, as shown in Figure 4, the lens 2, the electrode 3, 4 for supplying power, and the configuration of the body 6 is a conventional LED The structure is the same as that of the lead frame 201, the LED chip 203, and the thermal controller 210 composed of the low temperature portion 211 and the high temperature portion 212 is made of a different configuration.

In the white LED lamp 200, a plurality of red, green, and blue LED chips 203 are arranged in a series or parallel or a mixture of serial and parallel on the lead frame 201 to efficiently implement white light for illumination. 5, a structure in which a plurality of red, green, and blue LED chips 203 according to the present invention are connected in a series pattern is illustrated as one example. Unexplained reference numeral 202 is an electrode pattern.

In addition, the number of the LED chips 203 is not particularly limited when the white light is implemented through the combination of the red, green, and blue LED chips 203, and may be variously designed according to the purpose of implementing the white light. .

In addition, the thermal controller 210 of the white LED lamp 200 is composed of a low temperature portion 211 and a high temperature portion 212 driven by a thermal control power supplied from the power converter 100 to generate a temperature difference. As the thermoelectric cooling device 210, the high temperature heat generated by the white LED lamp 200 is absorbed through the low temperature unit 211 and serves to discharge to the outside through the high temperature unit 212.

At this time, the thermoelectric cooling element 210 is a device having a Peltier effect that endothermic and exothermic action according to the supplied current, the endothermic and exothermic can be switched according to the current direction, the endothermic and the calorific value is adjusted according to the current Has the function.

In addition, the thermal controller 210 has a high temperature portion 212 of the thermal controller 210, that is, the thermoelectric cooling element 210, so that the thermal controller 210 can be generated and reused as a current by using high temperature heat, which is waste heat emitted to the outside. The thermoelectric generator 220 may be additionally configured to include a high temperature unit 222 and a low temperature unit 221 coupled to each other.

Meanwhile, the thermal controller 300 receives the voltage and current applied to the white LED lamp 200 through feedback, and compares the received voltage and current with a preset parameter to determine the white LED lamp 200. After measuring the current temperature and outputs a corresponding thermal control drive signal to the power converter 100.

FIG. 6 is a graph showing a change characteristic of a voltage-current curve of an LED according to temperature, which is a red, green, and blue LED using the change in characteristics of a voltage-current (VI) according to each temperature. This means that the current temperature of the LED can be measured by detecting the voltage and current.

Next, a control method of a lighting white LED lamp system having an active thermal controller according to an embodiment of the present invention using the lighting white LED lamp system having an active thermal controller having the above configuration will be described.

First, FIG. 7 is an operation flowchart showing a control method of a lighting white LED lamp system having an active thermal controller according to an embodiment of the present invention.

The thermal controller 300 receives driving power from the power converter 100 and receives a voltage and a current applied for driving the LED from the white LED lamp 200 emitting white light through a feedback (S1).

Subsequently, the thermal controller 300 compares the voltage and current received from the white LED lamp 200 with a preset parameter to measure the current temperature of the white LED lamp 200 (S2).

Here, the measurement of the current temperature of the white LED lamp 200 is measured by a predefined parameter using the change characteristic of the voltage-current curve of the LED according to the temperature shown in FIG.

Then, the thermal control unit 300 outputs a thermal control drive signal for active thermal control corresponding to the power converter 100 based on the measured current temperature of the white LED lamp 200 ( S3).

Then, the power converter 100 supplies the thermal control power corresponding to the thermal control driving signal received from the thermal control unit 300, that is, the specific current amount to the thermal controller 210 of the white LED lamp 200. (S4).

Subsequently, the thermal controller 210 is driven by the thermal control power supplied from the power converter 100 to absorb the abnormally high temperature heat generated by the white LED lamp 200 through the low temperature unit 211. , It is released to the outside through the high-temperature unit 212 (S5).

The present invention enables the temperature of the white LED lamp 200 to be kept constant by repeatedly performing the above-described control step sequentially, and thus the brightness of the LED according to the change of the ambient temperature as shown in FIG. By implementing the characteristics under the optimum conditions, it is possible to secure a constant light output and color rendering.

As described above, according to the present invention, an illumination white LED lamp system having an active thermal controller and a method of controlling the same, in order to maintain a constant light output characteristic changed by an external ambient temperature when driving a white LED lamp for illumination. Through efficient control of heat absorption and heat dissipation using an active heat controller, it is possible to keep the driving temperature of the LED in an optimal state consistently so that the light output and color rendering of the stable and constant white light regardless of the external ambient temperature change There is an outstanding effect that can be implemented.

Claims (5)

A power conversion unit converting AC power supplied from the outside into driving power for driving the white LED lamp and outputting the same, and outputting a corresponding thermal control power when a thermal control driving signal is received; A white LED lamp provided with a thermal controller of a thermoelectric cooling element which receives a driving power from the power converter unit and drives white light, and receives a thermal control power from the power converter unit and actively performs a thermal control function; And The voltage and current applied to the white LED lamp are input through feedback, and the current temperature of the white LED lamp is measured by comparing the received voltage and current with a predetermined parameter, and then the corresponding thermal control drive signal is read. White LED lamp system for lighting having an active thermal controller, characterized in that the thermal control unit for outputting to the power converter unit. The method of claim 1, The white LED lamp is an active column, characterized in that the red, green, and blue LED chips have a structure in which a plurality of LED chips are connected in series or in parallel or a mixture of series and parallel on a lead frame in order to efficiently implement white light for illumination. White LED lamp system for lighting with controller. The method of claim 1, The thermal controller of the white LED lamp includes a low temperature unit and a high temperature unit that generate a temperature difference by driving by a heat control power supplied from the power converter unit, and absorbs high temperature heat generated by the white LED lamp through the low temperature unit. White LED lamp system having an active thermal controller, characterized in that consisting of a thermoelectric cooling element for emitting to the outside through a high temperature portion. The method according to claim 1 or 3, The thermo controller further comprises a thermoelectric generator comprising a high temperature part and a low temperature part coupled to a high temperature part of the heat controller so as to be generated and reused by using high temperature heat, which is waste heat emitted to the outside, to be reused. White LED lamp system for lighting with active thermal controller. A first step of the thermal control unit receiving driving power from the power converter unit and receiving a voltage and a current applied for driving the LED from the white LED lamp emitting white light through a feedback; A second step of measuring the current temperature of the white LED lamp by comparing the voltage and current received by the thermal controller with a preset parameter; A third step of the thermal control unit outputting a thermal control driving signal for active thermal control corresponding to the power conversion unit based on the measured current temperature of the white LED lamp; A fourth step of supplying, by the power converter, a thermal control power corresponding to a thermal control driving signal received from a thermal control unit to the thermal controller of the white LED lamp; And An active type characterized in that the thermal controller is driven by a thermal control power supplied from the power converter unit to sequentially absorb the high temperature heat generated by the white LED lamp and release it to the outside A method of controlling a white LED lamp system for lighting having a thermal controller.

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