TWI391114B - Light - emitting diode food heaters - Google Patents

Description

Light-emitting diode food warmer

The invention relates to a light-emitting diode food warmer, in particular to a light source which can emit light from a plurality of light-emitting diodes to the outside, and produces a gorgeous gorgeous visual effect, and can also be emitted by using the light-emitting diode. Heat or heat the food or food container.

With the rapid development of the light-emitting diode Light Emitting Diode (LED), the luminous current of the alternating current LED has reached 78mW, which is not only small in size, long in life, fast in response, low in power consumption, color temperature, Stability and color rendering are high, and countries such as the European Union have decided to replace tungsten filament bulbs in 2012. Although the outlook is optimistic, LEDs still have many problems to overcome. The first problem is how to export the heat generated by the alternating current LED (LED) to avoid Overheating affects LED light output and lifetime. The internal structure of the LEDs according to the LEDs is very simple, all of which are constructed using a DC LED in a bridge connection, and the internal structure is as shown in the ninth diagram.

According to the general methods of heat dissipation, there are three methods of conduction, convection, and radiation. Most of the research studies use the heat generated by the AC LEDs to naturally introduce heat into the air using a high thermal conductivity substrate, which is a conduction heat dissipation method. Since the heat produced by the LED of the LED is up to 130 ° C, it is gradually used as an electric heating element for all electric furnaces in the home, which has the disadvantages of large volume, high power consumption, and difficulty in retracting and accommodating. When the body AC LED emits light, there is an 80% heat loss, resulting in unnecessary power consumption.

At present, most known heat-dissipating materials use aluminum substrates as conductive heat-dissipating materials. Generally speaking, many products claim to have a life of 20,000 hours, but they are all exaggerated because one LED product has not only one LED but only one LED. There are other circuits or components such as resistors and capacitors. According to the current knowledge, in the aspect of heat-dissipating substrates, aluminum is mainly used, mainly because its price is relatively cheap. Although other materials have good heat dissipation, the price is too expensive, so that it cannot be mass-produced. It is also necessary to consider the LED arrangement and how the heat is transferred inside the LED. Although some processes can reduce the LED temperature, it is limited to the expensive process, and it is necessary to reduce the cost to commercialize it.

Since the heat energy generated by the watt-level high-power LED loading current is about tens to hundreds of times that of the conventional LED, the heat increases the grain temperature of the LED, thereby affecting the light quality, reducing the reliability and shortening the product life, so the overall LED system must Introduce heat-dissipating components for thermal management to ensure the quality of tile-level LED products. Common heat sink objects include heat sink fins, fans, thermal grease, heat pipes, etc. Metal-based printed circuit boards can also be used as an alternative. Please refer to the table below for the thermal expansion coefficient and thermal conductivity of copper-aluminum and LED materials.

The thermal evaluation design is a key factor in reliable high wattage LED products. The method of heat dissipation evaluation is briefly described as follows: When the current drives the LED die, the chip will generate light and heat due to the combination of electrons and holes, and the wafer position will be It is equivalent to a heat source (Heat Source). The PN Junction Temperature (T _j ) of the LED and the ambient temperature (T _a ) create a temperature gradient, so that heat flows through the adhesive, gold wire or cross to the scaffold, which is then convected by the scaffold to the environment. When the Tj of the LED reaches the limit temperature (T _jMAX ) for a period of time, heat may cause defects in the nature of the semiconductor, resulting in performance degradation or failure. In addition, the thermal expansion coefficient (CTE) of the polymer material before and after the T _g point has a large difference. If the T _g point of the adhesive or the encapsulant in the structure is close to or greater than T _j , the intergranular agent between the crystal grains and the substrate Or the volume expansion shrinkage of the sealant around the grain will increase, even liquefaction. The stress generated by the interface between the die, gold wire and sealant causes the gold wire bond to be displaced, resulting in LED failure. Therefore, the faster the LED structure is designed to take away heat to the environment, the lower the T _j , the reliability of the finished LED product will increase, and the service life can be extended. Generally, the value of T _jMAX is 125~135 °C.

At an operating temperature of -10 to 60 ° C, the heat resistance of the LED element including epitaxial, reflector, lens (Lens), LED array and other materials can reach the temperature of each component during illumination.

In recent years, the issue of electronic heat dissipation has attracted considerable attention and attention in the 3C industry, mainly due to the continuous development of high-performance, high-speed, thin and light electronic wafers, and the power dissipation of electronic components (Power Dissipation) and The relative heat flow (Heat Flux) is getting higher and higher, and the problem of electronic heat dissipation becomes the key issue for electronic products to overcome, which also makes the thermal management industry flourish.

According to the known state of foreign technology development, the reinforcing materials generally used for high-conductivity thermal composite materials are mainly graphite, carbon fiber and artificial diamond powder, mainly composed of carbon atoms, which have higher heat transfer characteristics than metals. . In the case of graphite, the thermal conductivity is between 200 and 600 W/m ‧ K; the carbon fiber is between 500 and 1100 W/m ‧ K, and the carbon fiber in the gas phase can even reach 1600 W/m ‧ K or more; The thermal conductivity generally also has a level of 700 W/m‧K or more. The composite material made of these high-heat-conducting reinforcing materials combined with metal (Al, Cu, Au, Mg) has the characteristics of adjustable high heat conduction, low thermal expansion and light weight, and can surpass the current aluminum, copper, Metal heat sink material such as silver.

According to the known state of domestic technology development, various graphite combinations are made of graphite-aluminum-based composite materials, and the thermal conductivity in the plane direction is about 560 W/m‧K on average, and the thickness direction is only about 100 W/m‧K. Graphite tends to be aligned in a planar direction when pressed into a preform. In addition, the diamond-reinforced aluminum-based composite material has a thermal conductivity of 550~600W/m‧K, which is similar to the foreign products.

Furthermore, the generally known coffee and tea heating warmer comprises a base and a container for placing coffee and tea, and an electric heating element is arranged on the base when the container is placed on the base. The electric heating element converts the commercial AC power into heat energy, so that the temperature of the base is gradually increased to heat and heat the coffee and tea contained in the container.

Although the conventional structure can heat and heat coffee and tea, the base has a groove for heating the shape of the container, so that it can only place a container of a specific shape, so that the food is The cups or other shaped containers cannot be placed directly on the base for heat preservation, so the application range for the heat preservation is limited to a certain extent, which causes inconvenience and trouble in use, and the electric heating element is a considerable power consumption. The components, so will increase the cost of electricity. On the other hand, the conventional structure cannot emit a gorgeous and gorgeous light source to increase the visual perception of the atmosphere, so that the value of the commodity is less obvious.

In view of the fact that the light-emitting diode AC LED has the characteristics of illuminating and generating high thermal energy, the present inventors have not actively used a device which has both brilliance and heat preservation functions, and the inventors have actively studied and researched and finally developed and experimented. Finally, the results of the present invention.

The main object of the present invention is to provide a light-emitting diode food warmer which utilizes the characteristics of light-emitting diode AC LED having light emission and high heat energy, and can not only utilize the brilliant and dazzling visual effect produced by the gorgeous LED. Adding a creating atmosphere, and heating and holding food or food containers with high heat characteristics, thereby extracting the heat energy generated by the light-emitting diodes for thermal energy reuse, thereby prolonging the service life of the light-emitting diodes, and having The function of the simmered food can make the food or food container of different shapes reach the constant temperature heating effect, thus having the atmosphere, the wide application range of the heat preservation, the good heat preservation effect, the high stability and the small power consumption. For personal use, small size, simple collection, can be connected to household electricity 110V without transformer conversion voltage and many other characteristics.

In order to achieve the above-mentioned effects, the technical means adopted by the present invention comprises a base, a heat-conducting plate, a power supply device and a plurality of light-emitting diodes, wherein the top surface of the plate can be used for placing food or food containers, and A plurality of light-emitting diodes are disposed on the board, and when a plurality of light-emitting diodes receive light and heat from the power provided by the power supply device, heat can be transferred to the board, and the food or food container can be heated. By.

壹. Basic technical features of the present invention

Referring to Figures 1 to 3, the present invention is mainly used for the heating or heat preservation of food (1a), especially for food containers (1), cups or foods (1a) containing coffee or tea. Heat insulation. Since the existing light-emitting diodes, especially the LEDs produced by the LEDs, can reach 130 ° C, the heat dissipation problem has always hindered the development of the light-emitting diodes, such as when the LEDs of the LEDs are illuminated. 80% heat loss. In view of the above, the present invention uses a light-emitting diode AC LED to generate a high-heat and heat-dissipating defect, thereby producing a miniaturized heater for personal use, which is not only small in size, low in power consumption, and simple in collection, and When designed as a light-emitting diode AC LED, it can be connected to the mains 110V, without transformer conversion voltage.

The invention not only has the function of warm food, but also can be designed to make the base (20) emit a gorgeous blue light visual effect, especially in the case of dim light, the effect of the light visual is better, such as the first The four pictures and attached photos are shown. That is, the present invention utilizes the characteristics of the light-emitting diode (11) to emit light and generate high thermal energy, in addition to the blue line light source that can be emitted from the base (20), and the heat energy generated by the light-emitting diode (11) can be generated. Exported to heat the food (1a), in order to achieve the purpose of thermal energy reuse, and at the same time, it has the function of simmered food (1a), so it has good heat preservation effect, and does not limit the shape of the food container (1) or the cup to have A variety of food (1a) heating and insulation purposes and many other characteristics.

Referring to the first to third figures, in order to achieve the above effects, a specific embodiment of the present invention includes a circuit board (10) having a plurality of light emitting diodes (11) and a light transmissive base ( 20) (which may be made of acrylic), a thermally conductive plate (30), and a power supply unit (40) for electrically connecting the LED (11) to an AC power source to form an AC load circuit. The base (20) has a basin shape and a cylindrical shape and has an upward opening (212), and is recessed downward from the opening (212) to form a recess (21), and the recess (21) and The contours of the plates (30) are all circular. In addition, the preferred embodiment of the photodiode (11) used in the present invention may be a light-emitting diode AC LED (11) capable of withstanding a commercial AC, and a specific embodiment of the power supply device (40) may include a power supply. The plug (42) and a power cord set (41) electrically connected to the power plug (42) supply the AC power of the commercial AC to the LEDs (11).

Referring to the first, fifth and sixth figures, the present invention is characterized in that the disc-shaped circuit board (10) is provided with at least one light-emitting diode AC LED (11), and an upward is provided on the base (20). Forming a groove (21) of the opening (212), and dividing the ring wall (22) of the groove (21) into a large section and a small section opposite to each other at the two ends, and the inner wall of the two ends of the small section is connected A partition wall (23) protruding in the center is provided, and the groove (21) is partitioned from the large groove (210) and a small groove (211) by the partition wall (23). (210) is filled with a light transmissive oil (50) (the oil (50) may be glycerin or ash oil). The temperature distributed throughout the large tank (210) is more uniform by the temperature absorbed by the oil (50). A through hole (24) is disposed in a small portion of the ring wall (22) of the base (20), and the small capacity groove (211) can be communicated with the outside through the through hole (24), thereby enabling the power line group (41) to be Passed through the perforation (24).

Referring to Figures 1-4, the profile of the panel (30) of the present invention cooperates with the contour of the opening (212) of the recess (21) to cover the opening (212) of the recess (21). And the top surface of the plate (30) is placed for the food (1a) or the food container (1), and a plurality of positioning holes (31) are provided on the bottom surface thereof, and the circuit board (10) is provided with a bolt (32) By inserting the bolt (32) into the positioning hole (31), the circuit board (10) is fixed on the bottom surface of the board (30), and a plurality of LEDs (11) are placed on the base (20). In the recess (21), when the power supply unit (40) starts supplying the power required for the plurality of LEDs (11), the LED LED (11) is transmitted through the base (20). The blue line source to the outside world can be absorbed by the oil (50) by the heat energy emitted by the LED LED (11), so that the heat temperature distributed in the entire large tank (210) can be further increased. It is uniform to allow the sheet (30) to conduct heat uniformly, and then the food (1a) or the food container (1) can be heated and insulated, as shown in the fifth and sixth figures.

In addition, in order to improve the efficiency of thermal energy reuse, the specific embodiment of the circuit board (10) may be a substrate with high thermal conductivity for naturally introducing thermal energy into the air in the large tank (210), and may be The oil (50) is absorbed, so that the temperature of the heat distributed throughout the large tank (210) can be more uniform.

贰‧Specific embodiment of the invention 2.1 Light-emitting diode AC LED

Referring to the first to fourth figures, the present invention mainly utilizes the characteristics of the light-emitting diode AC LED (11) having light emission and generating high thermal energy. As shown in the eighth figure, not only the blue emitted can be utilized. The color line light source is used to add an atmosphere, and the food (1a) or the food container (1) can be heated and insulated by utilizing the characteristic of generating high heat, thereby transferring and reusing the heat energy generated by the LED LED (11), thereby Extend the life of the LED LED (11).

Referring to the first, seventh and ninth diagrams, in one embodiment, the number of LEDs (11) of the LEDs is ten, and is electrically connected to the AC AC power source by a bridge connection. For the purpose of reducing the voltage, the maximum voltage effective value of each LED diode (11) is 85V, and each LED diode (11) is connected in series with a 3.9KΩ resistor. The voltage is divided by 25V _rms , and the volume ratio of the recess (21) of the base (20) to the LED LED (11) is at least 0.25/cm 2 , and each LED is AC. The maximum effective voltage of the LED (11) is 85V, and each LED diode (11) is connected in series with a 3.9KΩ resistor, and the resistor is used for voltage division to withstand a voltage of 25V _rms .

In the above embodiment, at least one of the plurality of light emitting diodes (11) can emit a blue light source, and at least two of the plurality of light emitting diodes (11) emit light sources of different frequency colors.

2.2 base and plate

Referring to the fourth and fifth figures, the base (20) of the present invention is made of an acrylic transparent material, so that the light source emitted by the light emitting diode (11) can penetrate to the outside, and the base (20) The bottom part is provided with a plurality of mirror surface structures (25), each mirror surface structure (25) corresponding to a light emitting diode (11), which can reflect the light emitted by the light emitting diode (11), and the base (20) The circumference of the circumference is shot out to enhance the intensity and light layering of the effective external shot of the light source. In addition, in order to ensure that the proportion of the oil (50) in the groove (21) is relatively large, the volume of the large volume (210) of the present invention is about seven times the volume of the small volume (211), such as A picture shows.

Referring to the first and fifth figures, the sheet (30) of the present invention is made of aluminum material with good heat conduction effect and low cost, and since the top surface of the sheet (30) is flush, it is Both the food (1a) and the food container (1) can be placed on the sheet (30) for heating and heat preservation, and thus are not limited in shape as in the conventional structure described above. Furthermore, for the purpose of protecting the power cord set (41), the present invention is provided with a long slot (33) extending from the center to the outside outwardly on the bottom surface of the panel (30), and the power supply device (40) includes a power source a wire group (41), the power wire group (41) is embedded in a long groove (33) of the plate (30), and one end is passed out to the outside through the small groove (211) and the through hole (24), and the long groove (33) Filling the epoxy (51) to cover the power cord set (41), thereby insulating the oil (50) from the power cord set (41).

Referring to the third figure, in order to make the present invention have a simmering function, especially a stuffed egg, the present invention forms a shallow groove (27) for water to be placed on the top surface of the sheet (30). In order to enhance the smoldering effect, the present invention is provided with an open cover (26) on the plate (30) to enhance the stuffy food (1a). The speed of ripening.

In the above embodiment, the present invention fixes the plate (30) on the base (20) by a fixing means, and the fixing means can adhere the adhesive (60), as shown in the fifth figure; or is a bolt ( 61) The locking method is to fix the plate (30) on the base (20) as shown in the sixth figure.

An experimental example of a specific embodiment of the present invention

Referring to Figures 7 and 8, the following is the power emitted by an AC LED (11): power: voltage × current (V _LED = 85 Vrms; I = 9 Ma; P = V _LED × I = 85 × 9m = 0.765W), 80% of each LED will be converted into thermal energy so 0.768 × 0.8 = 0.712W, the heat supplied per second is 0.24 × 0.612 × t (sec ) = 22.6 × 0.897 × ΔT.

From the above calculations, we know the heat emitted by each LED diode (11), but on the plate (30), the aluminum plate (30) absorbs heat while dissipating heat. In the end, it will maintain the state of thermal equilibrium. In this experimental example, the temperature on the plate (30) is slowly recorded in 30 seconds, 1 minute, and 2 minutes, and the time-to-temperature characteristic curve is drawn through the Origin, such as The eighth picture is shown.

Please refer to the seventh figure, which is the basic circuit diagram of the present invention. It can be found from the above temperature test that the most suitable LED LED (11) has 10 LEDs and one LED diode (LED). The maximum voltage effective value is 85V, so a 3.9KΩ resistor should be connected in series on the LED. The function of the resistor is divided voltage, and the resistor is subjected to a voltage of 25V _rms . Here is the power consumed to calculate the resistor:

P=V×I=25V×9mA=0.225W

It is ok to use a 1/4W resistor on the surface, but considering the peak voltage and peak current of the AC, the calculated power is multiplied by 2 (0.225 × 2 = 0.45W), which is what the resistor really can withstand. From the power, it is known that the resistance wattage used in the present invention is 1/2W.

It is known from the above experimental examples that since the light-emitting diode AC LED is composed of a plurality of DC LEDs electrically connected by bridge rectification, the disadvantage is that the alternating current is not brighter than the on-voltage of the LED, although That time is very short, it can't be seen by the naked eye, but when measuring its current, it can be clearly found that the positive and negative half cycles are not conductive for a certain period of time, making the efficiency of the LED LED (11) It is reduced; however, the heating rate difference of the present invention can be found from the temperature profile, and the temperature balance point is indeed the holding temperature required by the present invention. In a preferred embodiment, a plurality of LED diodes (LEDs) can be added and a temperature sensor is added to allow all of the LEDs (11) to work together at low temperatures. When the insulation point is reached, only 10 LEDs (11) of the LEDs are kept at a constant temperature of 55 °C.

In addition, since the present invention is directly connected to the AC power source of the commercial power supply, it is necessary to consider whether the board will be short-circuited with the circuit, and the specifications of the resistors and the wires must meet the requirements of the highest current in the circuit. To ensure that the product does not explode or the wire is ignited during use. The invention adopts the light-emitting diode AC LED (11) as a heat source component, and can also be developed into a DC LED and a solar panel in the future, so that the invention is not limited by the power source, and can be conveniently used in various places, thereby achieving development. The purpose of green energy.

肆‧Conclusion

Therefore, with the above technical features, the present invention does have the following features:

1. The present invention utilizes the characteristics of light-emitting diode AC LED having luminescence and generating high thermal energy, which can not only utilize the effect of the gorgeous light source to add an atmosphere, but also utilize high-heat characteristics for food or food containers. Heating and heat preservation is performed to derive the heat energy generated by the LED of the LED to achieve the purpose of reusing heat, thereby prolonging the service life of the LED of the LED.

2. The invention not only has the function of simmering food, but also can achieve the constant temperature heating and heating effect of different shapes of food or food containers, thus having the atmosphere of building, wide application range of heat preservation, good heat preservation effect and high stability. Low power consumption and many other characteristics.

The above is only one of the possible embodiments of the present invention, and is not intended to limit the scope of the patents of the present invention, and the equivalent implementations of other changes according to the contents, features and spirits of the following claims are It should be included in the scope of the patent of the present invention. The invention is specifically defined in the structural features of the request item, is not found in the same kind of articles, and has practicality and progress, has met the requirements of the invention patent, and has filed an application according to law, and invites the bureau to approve the patent according to law to maintain the present invention. The legal rights of the applicant.

(1). . . Food container

(1a). . . food

(10). . . Circuit board

(11). . . Light-emitting diode

(20). . . Base

(twenty one). . . Groove

(210). . . Large capacity

(211). . . Small pocket

(212). . . Opening

(twenty two). . . Ring wall

(twenty three). . . Partition wall

(twenty four). . . perforation

(25). . . Mirror structure

(26). . . Cover

(27). . . Shallow groove

(30). . . Plate

(31). . . Positioning hole

(32). . . Bolt

(33). . . Long slot

(40). . . Power supply unit

(41). . . Power cord set

(42). . . Power plug

(50). . . Oil

(51). . . Epoxy resin

(60). . . Adhesive

(61). . . bolt

The first figure is an exploded schematic view of the basic structure of the present invention.

The second drawing is a schematic diagram of a specific embodiment of the present invention.

The third figure is a schematic diagram of another embodiment of the present invention.

The fourth figure is a schematic diagram of the lightening effect of the present invention in dim light.

The fifth drawing is a schematic cross-sectional view of a specific embodiment of the present invention.

Figure 6 is a schematic cross-sectional view showing another embodiment of the present invention.

The seventh figure is a schematic diagram of a circuit for connecting a voltage dividing resistor of the present invention.

The eighth figure is a schematic diagram of the control curve of the heating time of the present invention.

The ninth drawing is a schematic circuit diagram of the bridge connection method of the present invention.

Attachment: A photograph of the dimming effect of the sample of the present invention in dim light.

(10). . . Circuit board

(11). . . Light-emitting diode

(20). . . Base

(twenty one). . . Groove

(210). . . Large capacity

(211). . . Small pocket

(212). . . Opening

(twenty two). . . Ring wall

(twenty three). . . Partition wall

(twenty four). . . perforation

(30). . . Plate

(31). . . Positioning hole

(32). . . Bolt

(33). . . Long slot

(40). . . Power supply unit

(41). . . Power cord set

(42). . . Power plug

(50). . . Oil

Claims (15)

A light-emitting diode food warmer includes: a base having a basin shape and having an upward opening, and a recess is formed in the recess from the opening, and the ring wall of the recess is divided into two ends. a large section and a small section of the connecting portion, the inner wall of the two ends of the small section is connected with a partition wall protruding toward the center, and the partition wall partitions the recessed area into a large capacity slot and a small pocket The large tank can be filled with oil with uniform heat conduction. The small section of the ring wall of the base is provided with a perforation, and the perforation is used to make the small tank communicate with the outside; a heat conducting function a plate covering the opening of the groove, the top surface of the plate is for placing a food or food container; a power supply device having a power cord set, the power cord set has one end traversing the perforation, and the other end is Electrically connecting an alternating current power source; and a plurality of light emitting diodes (AC LEDs) disposed on the board, the plurality of light emitting diodes (AC LEDs) being electrically connected to one end of the power line group to form an alternating current load a loop when the plurality of light emitting diodes (AC LEDs) are received by the power supply unit When the electrical energy of the emitted light and emitting heat, the heat can be uniformly transferred onto the sheet by the oil, and then heating the food or the food container. The light-emitting diode food warmer of claim 1, wherein the bottom surface of the plate is provided with a long groove extending from the center to the outside, the power wire group is embedded in the long groove, and the long groove is Fill the epoxy to cover the power cord set. The light-emitting diode food warmer according to claim 1, wherein the base is permeable to light, and the inside is filled with a light-transmissive oil and accommodates the plurality of light-emitting diodes. (AC LED), the light emitted by the plurality of LEDs is transmitted from the base to the outside, and the oil absorbs heat generated by the LED (AC LED) Make the temperature more uniform. A light-emitting diode food warmer according to claim 1 or 3, wherein the oil may be glycerin or ash oil. The light-emitting diode food warmer of claim 1 or 3, wherein the ratio of the volume of the base to the plurality of light-emitting diodes (AC LEDs) is at least 0.25 particles/cm 3 , each of which The maximum effective voltage of the light-emitting diode (AC LED) is 85V, and each of the light-emitting diodes (AC LED) is connected in series with a 3.9K Ω resistor, and the resistor is used for voltage division to withstand a voltage of 25V _rms . The light-emitting diode food warmer of claim 1, wherein the plurality of light-emitting diodes (AC LEDs) are fixed on a circuit board, and the circuit board is further fixed on the board. The light-emitting diode food warmer of claim 6, wherein the bottom surface of the plate is provided with a plurality of positioning holes, and the circuit board is provided with a plurality of bolts, and the bolts are inserted into the positioning holes. The circuit board is fixed to the bottom surface of the board. The light-emitting diode food warmer of claim 1, wherein the base has a cylindrical shape, and the groove and the plate have a circular shape. The light-emitting diode food warmer of claim 1, wherein the number of the plurality of light-emitting diodes (AC LEDs) is 10, and the maximum voltage effective value of each of the light-emitting diodes (AC LEDs) It is 85V, and each of the light-emitting diodes (AC LEDs) is connected in series with a 3.9K Ω resistor, and the resistor is used for voltage division to withstand a voltage of 25V _rms . The light-emitting diode food warmer of claim 1, wherein at least one of the plurality of light-emitting diodes (AC LEDs) emits a blue-ray source. The light-emitting diode food warmer of claim 1, wherein at least two of the plurality of light-emitting diodes (AC LEDs) emit light of different frequency colors. The illuminating diode food warmer of claim 1, wherein the bottom of the base is provided with a plurality of conical mirror structures, each of the mirror structures corresponding to the LED (AC LED), The light emitted by the light emitting diode (AC LED) is reflected and emitted from the peripheral surface of the base. The light-emitting diode food warmer of claim 1, wherein the base is made of an acrylic material. The light-emitting diode food warmer of claim 1, wherein the sheet is made of aluminum. The light-emitting diode food warmer according to claim 1, wherein the top surface of the plate forms a shallow groove into which water can be placed, and a cover is disposed on the top of the plate to be placed in the opposite direction. The shallow grooved food is simmered.