CN201532936U - Low power electrodeless lamp tube and light source - Google Patents

Abstract

The utility model discloses a low-power electrodeless lamp tube and a light source. A fluorescent powder-covered layer is arranged on the inner surface of the lamp tube; the lamp tube comprises two parallel tube bodies, namely a cylindrical tube body and an ellipsoidal tube body; one end of each parallel tube body is closed, and the other end thereof is smoothly connected with the ellipsoidal tube body; the interiors of the two parallel tube bodies are communicated through the ellipsoidal tube body; and the cylindrical tube body is communicated between the two parallel tube bodies. By adopting the electrodeless lamp tube, excitation coils can be directly wound on the cylindrical tube body to replace a coupler in the prior art, so that the miniaturization design is facilitated.

Description

Low power electrodeless lamp tube and light source

technical field

The utility model relates to the technology of an electrodeless lamp, in particular to a low-power electrodeless lamp tube and a light source.

Background technique

The electrodeless lamp is a high-tech product developed by comprehensively applying the latest scientific and technological achievements in the fields of power electronics, plasma science, and magnetic materials. It represents the future development direction of high light efficiency, long life, and high color rendering in the field of lighting technology. Lighting experts call this new green lighting source "the beginning of a new revolution in the field of lighting", and it will surely become the most promising green and energy-saving lighting source in the 21st century.

At present, the commonly used electrodeless lamp is an electromagnetic induction electrodeless lamp, which is mainly composed of three parts: a high frequency generator, a coupler and a bulb. The function of the high-frequency generator is similar to the electronic ballast of ordinary energy-saving lamps. It converts the power frequency mains into a high-frequency strong signal and transmits it to the coupler. The function of the coupler is like a transmitting antenna, which couples the high-frequency strong signal into the bulb to complete the second transfer of energy. The light bulb is a closed cavity filled with working gases such as rare gas and mercury vapor, and the wall of the light bulb is coated with luminescent substance phosphor. When the coupler couples high-frequency energy into the bulb, the working gas in the bulb undergoes gas avalanche ionization under the action of a strong electromagnetic field to form a plasma. When the excited atoms of the plasma return to the ground state, they spontaneously radiate 254nm ultraviolet rays, and the ultraviolet rays excite fluorescence. The powder emits visible light, thus completing the third conversion of energy. During the three energy conversion processes, there is no filament or electrode involved in the work, so the life of the electrodeless lamp depends only on its electronic circuit, the manufacturing technology of the bulb and the natural attenuation of the phosphor powder, making its life much longer than that of traditional light sources such as incandescent lamps. And gradually reflect its market advantage.

At present, the service life of common electrodeless lamps on the market has exceeded 60,000 hours, which is 60 times that of incandescent lamps and 20 times that of halogen lamps. Compared with ordinary incandescent lamps, it can save energy by more than 80%. There are mainly two forms of its design composition, as follows:

The first is to wind the excitation coil on the ferrite core to form a coupler, and the coupler is built into the light-emitting tube. Please refer to Figure 1 for details. The high-frequency generator is built into the metal sleeve to form the lamp holder 11; the coupler 12 is electrically connected to the high-frequency generator in the lamp holder 11, and placed in the light-emitting lamp tube 13 after assembly. Thus, a discharge space is formed in the luminescent lamp tube 13; the luminescent lamp tube 13 is filled with rare gas and mercury vapor, and the surface is coated with a fluorescent layer.

The second is to hoop the magnetic ring on the lamp body, that is, the magnetic ring coupling form. In this form, the lamp body needs to be designed as a closed structure, such as a closed ring or rectangle. Please refer to FIG. 2 for details. Taking a closed rectangle as an example, magnetic rings 22 are symmetrically arranged on two symmetrical sides of the lamp body 21 , and the magnetic rings 22 are hooped on the lamp body 21 .

The electrodeless lamp with the above design structure has many advantages of the electrodeless lamp. However, with the further improvement of the energy saving requirements, people have more and more requirements for the electrodeless lamp with low power. people's attention. When the above first type of electrodeless lamp is miniaturized, heat dissipation will be encountered, so elements such as heat dissipation pipes need to be added, which complicates the manufacturing process and increases the manufacturing cost. As for the second type of electrodeless lamp, the volume of the magnetic ring and the shape of the electrodeless lamp limit its further miniaturization, which is more suitable for the manufacture of high-power electrodeless lamps.

For this reason, there is a need in the market for a new electrodeless lamp that is suitable for low-power applications and that is easy to miniaturize.

Utility model content

The technical problem to be solved by the utility model is the miniaturization of the low-power electrodeless lamp.

In order to solve the above technical problems, the utility model provides a low-power electrodeless lamp tube, which has a fluorescent powder layer on its inner surface. The tube includes: two parallel tube bodies, a cylindrical tube body and an ellipsoid tube body, wherein One end of the two parallel pipes is closed, the other end is smoothly connected to the elliptical pipe, and the inside is communicated through the elliptical pipe, and the cylindrical pipe is connected between the two parallel pipes .

The utility model also provides a low-power electrodeless light source, including: a lamp tube with a fluorescent powder layer on its inner surface, and the lamp tube includes two parallel tube bodies, a cylindrical tube body and an ellipsoid tube body, wherein One end of the two parallel pipes is closed, the other end is smoothly connected to the elliptical pipe, and the inside is communicated through the elliptical pipe, and the cylindrical pipe is connected between the two parallel pipes ; the excitation coil is wound on the cylindrical tube and has a lead-out end for electrically connecting an excitation source; the amalgam is located at the closed end of the two parallel tubes; the rare gas is filled in the Inside the tube.

Further, when the low-power induction lamp light source is applied at 23W, the excitation coil has 14 turns to 22 turns.

Further, when the low-power induction lamp light source is applied at 15W, the exciting coil has 10 turns to 18 turns.

Further, the pressure of the rare gas filled in the lamp tube is 20Pa to 200Pa.

Further, the input frequency of the exciting coil is 2.5MHz to 15MHz.

It can be seen that the application of the above low-power electrodeless lamp tube can directly wrap the excitation coil on the lamp tube, thereby coupling electromagnetic energy into the lamp tube to excite the amalgam and rare gas in the lamp tube to generate plasma. When the excited atoms return to the ground state, they spontaneously radiate ultraviolet rays, and the ultraviolet rays excite the phosphor to emit visible light. Compared with the existing technology, no ferrite core is used, which greatly reduces the heat dissipation during use, so that no special heat dissipation design is required; in addition, the excitation coil is directly wound instead of the magnetic ring, which has the advantages of Conducive to its miniaturized design.

Description of drawings

Fig. 1 is a kind of structural schematic diagram of existing electrodeless lamp;

FIG. 2 is a structural schematic diagram of another existing electrodeless lamp;

Fig. 3 is a schematic structural view of a low-power electrodeless light source provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of the A-A direction of the low-power electrodeless light source in Fig. 3;

Fig. 5 is a schematic diagram of the B-B direction of the low-power electrodeless light source in Fig. 3;

FIG. 6 and FIG. 7 are schematic diagrams showing dimensions of the low-power induction lamp light source provided by an embodiment of the present invention.

Detailed ways

In order to make the above-mentioned features and advantages of the present invention more comprehensible, exemplary embodiments are given below, together with accompanying drawings, for a detailed description as follows.

Please refer to FIG. 3 , which is a schematic structural diagram of a low-power electrodeless light source provided by an embodiment of the present invention. And refer to FIG. 4 and FIG. 5 , which are schematic diagrams of directions A-A and B-B of the low-power induction lamp light source in FIG. 3 , respectively.

As shown in the figure, the lamp tube 100 of the low-power electrodeless light source is designed to be applied to a low-power electrodeless lamp, and the excitation coil 200 can be directly wound on it to replace the existing coupler, and the coupled electromagnetic energy enters the lamp tube 100 , to excite the amalgam and the rare gas in the lamp tube 100 to generate plasma, when the excited atoms in the plasma return to the ground state, they spontaneously radiate ultraviolet rays, and the ultraviolet rays excite the fluorescent powder to emit visible light. Compared with the prior art, the electrodeless light source provided in this embodiment does not use a ferrite core, thereby greatly reducing the heat dissipation during use, so that no special heat dissipation design is required; in addition, the excitation coil 200 The way of direct winding instead of the magnetic ring is beneficial to its miniaturized design.

Specifically, the lamp tube 100 is formed by smoothly connecting two parallel tube bodies 110, a cylindrical tube body 120 and an ellipsoid tube body 130; one end of the two parallel tube bodies 110 is closed, and the other end is connected to the ellipsoid tube body. The body 130 is smoothly connected, and the inside is communicated through the elliptical tube body 130 ; the cylindrical tube body 120 is connected between the two parallel tube bodies 110 .

In this way, the excitation coil 200 can be directly wound on the cylindrical tube body 120 and has a lead end 210 for electrically connecting an excitation source. In addition, the inner surface of the lamp tube 100 has a fluorescent powder layer 101 filled with a rare gas, and an amalgam 300 is provided at the closed ends of the two parallel tube bodies 110 .

The above low-power electrodeless light source, the coil is directly wound on the lamp tube to form a closed pear-shaped discharge tube, and the high-frequency current coupled electromagnetic field energy generated by it enters the lamp tube to excite the amalgam and rare gas in it, and Plasma is generated, and when the excited atoms of the plasma return to the ground state, they spontaneously radiate ultraviolet rays, and the ultraviolet rays excite the fluorescent powder to emit visible light. The specific principles are as follows:

Firstly, the excitation coil is wound around the cylindrical tube body as the energy input primary side; secondly, the excitation coil passes a current with MHz frequency as the coupled electrical signal; finally, the high-frequency electromagnetic energy generated by the high-frequency current is coupled into the lamp tube, Excited plasma radiates luminescence. This type of light source uses _a high-frequency electric field to ionize mercury atoms to form a discharge current (the ionization potential of Hg is ^10.4eV ). ) when it spontaneously transitions to the ground state, 253.7nm photons are generated; the 253.7nm photons excite the phosphor layer in the tube wall to generate three primary colors of visible light and form white light output.

Preferably, the above excitation coil is wound in a densely parallel winding manner, and the number of turns of the coil can be changed according to the actual power of the light source required, and is limited to wrapping the entire cylindrical tube body. Hereinafter, it will be described with reference to FIG. 6 and FIG. 7 through two specific embodiments.

Embodiment one:

Please refer to Figure 6, Figure 7 and Table 1 together, where Table 1 is a list of dimensions when the utility model is applied to a 23W electrodeless lamp.

Table 1

At this time, the number of turns of the excitation coil 200 is not less than 14 turns, and due to the limitation of the length L2 of the cylindrical tube body 120 , it can be wound up to 22 turns.

Taking 14 turns as an example, when the input frequency of the excitation coil 200 is 2.5MHz~15MHz, match the safety capacitor with a certain capacitance above 2KV withstand voltage value, and adjust the excitation voltage to increase the power of the light-emitting lamp from 10W to 40W. can be adjusted arbitrarily. Under the same conditions, when the excitation coil 200 has 18 turns, the power of the light-emitting lamp can be adjusted arbitrarily from 10W to 45W. Under the same conditions, when the magnetic coil 200 has 22 turns, the power of the light-emitting lamp can be adjusted arbitrarily from 10W to 55W.

It is worth mentioning that when the power of the above-mentioned light-emitting tubes increases, the light will show a tendency and characteristics of gradual diffusion. That is to say, when the luminous power is small, the luminous area mainly gathers around the excitation coil; when the power gradually increases, the luminous area develops to the parallel tubes on both sides, and gradually spreads to the ellipsoidal tube. After the final power is greater than 16W (regardless of the number of coil turns or the input frequency), the light emitting area covers the entire lamp tube, that is, the entire electrodeless lamp. However, if the power is reduced to below 12W, the light-emitting area is suddenly reduced to only a small area inside the light-emitting coil (regardless of the number of coil turns or the input frequency change).

Embodiment two:

Please refer to Figure 6, Figure 7 and Table 2 together, where Table 2 is a list of dimensions when the utility model is applied to a 15W electrodeless lamp.

Table 2

At this time, the number of turns of the excitation coil 200 is not less than 10 turns, and due to the limitation of the length L2 of the cylindrical tube body 120 , it can be wound up to 18 turns.

Taking 10 turns as an example, when the input frequency of the excitation coil 200 is 2.5MHz to 15MHz, match the safety capacitor with a certain capacitance above 2KV withstand voltage, and adjust the excitation voltage to increase the power of the light-emitting lamp from 5W to 30W. can be adjusted arbitrarily. Under the same conditions, when the excitation coil 200 has 14 turns, the power of the light-emitting lamp can be adjusted arbitrarily from 5W to 35W. Under the same conditions, when the magnetic coil 200 has 18 turns, the power of the light-emitting lamp can be adjusted arbitrarily from 5W to 40W.

Same as in Embodiment 1, when the power of the above-mentioned light-emitting lamp tubes increases, the light emission presents a tendency and characteristic of gradual diffusion. That is to say, when the luminous power is small, the luminous area mainly gathers around the excitation coil; when the power gradually increases, the luminous area develops to the parallel tubes on both sides, and gradually spreads to the elliptical tube. After the final power is greater than 16W (regardless of the number of coil turns or the input frequency), the light emitting area covers the entire lamp tube, that is, the entire electrodeless lamp. However, if the power is reduced to below 12W, the light-emitting area is suddenly reduced to only a small area inside the light-emitting coil (regardless of the number of coil turns or the input frequency change).

It can be seen that the electrodeless light source provided by the utility model can realize the adjustment of the brightness of the light source, and can be flexibly applied according to the requirements for the brightness of the light source in different fields.

In addition, through the selection of phosphor powder, it is possible to configure light-emitting lamps with different color temperatures from 2700K to 6500K.

Experiments show that the low-power electrodeless light source provided by the utility model can guarantee a light effect of 20-40lm/W, and compared with traditional fluorescent lamps, it has the characteristics of high efficiency, low failure rate, and long life. In addition, experiments have shown that when the pressure of the rare gas filled in the lamp tube is 20 to 200 Pa, the life of the light source is longer, for example, 50 Pa of krypton gas. Of course, the utility model is not limited thereto, and the lamp tube can also be filled with other rare gases, of course, it can also be filled with a mixture of various rare gases, or even a mixture of rare gases and mercury vapor.

To sum up, using the above low-power electrodeless lamp tube, the excitation coil can be directly wound on the lamp tube, so as to couple electromagnetic energy into the lamp tube to excite the amalgam and rare gas in the lamp tube to generate plasma. When the excited atoms of the body return to the ground state, they spontaneously emit ultraviolet rays, and the ultraviolet rays excite the phosphor to emit visible light. Compared with the existing technology, no ferrite core is used, which greatly reduces the heat dissipation during use, so that no special heat dissipation design is required; in addition, the excitation coil is directly wound instead of the magnetic ring, which has the advantages of Conducive to its miniaturized design.

Furthermore, the obtained electrodeless light source is an electrodeless fluorescent light source that directly winds the discharge tube through a coil to couple electromagnetic energy and then emit light. While ensuring the light effect reaches 20-40lm/W, compared with traditional fluorescent lamps, it does not use ferrite cores, which greatly reduces the heat dissipation during use, so that no special heat dissipation design is required; in addition, The method of directly winding the excitation coil instead of the magnetic ring is beneficial to its miniaturization design. The small and compact shape structure can make it have application value in various search lighting, construction and maintenance lighting, and civil lighting.

The above are examples only, and are not intended to limit the utility model, and the protection scope of the utility model shall be subject to the scope covered by the claims.

Claims (6)

1. A low-power electrodeless lamp tube, which has a phosphor layer on its inner surface, is characterized in that the tube comprises: Two parallel tubes, one cylindrical tube and one ellipsoidal tube, one end of the two parallel tubes is closed, the other end is smoothly connected to the elliptical tube, and the inside communicates with the ellipsoidal tube , the cylindrical tube communicates between the two parallel tubes. 2. A low-power electrodeless light source, characterized by comprising: The lamp tube has a fluorescent powder layer on its inner surface, and the lamp tube includes two parallel tube bodies, a cylindrical tube body and an ellipsoid tube body, wherein one end of the two parallel tube bodies is closed, and the other end is connected to the ellipse tube body The spherical tubes are smoothly connected, and the interior is communicated through the ellipsoidal tubes, and the cylindrical tubes are connected between the two parallel tubes; an excitation coil wound on the cylindrical tube body and has a lead end for electrically connecting an excitation source; amalgam, located at the closed ends of the two parallel tubes; Rare gas is filled in the lamp tube. 3. The low-power induction lamp light source according to claim 2, characterized in that, when the low-power induction lamp light source is applied at 23W, the excitation coil has 14 turns to 22 turns. 4. The low-power electrodeless lamp light source according to claim 2, characterized in that, when the low-power electrodeless lamp source is applied at 15W, the excitation coil has 10 turns to 18 turns. 5. The low-power electrodeless light source according to claim 2, wherein the pressure of the rare gas filled in the lamp tube is 20Pa to 200Pa. 6. The low-power electrodeless lamp light source according to claim 2, wherein the input frequency of the exciting coil is 2.5MHz to 15MHz.

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