CN211821768U

CN211821768U - LED lighting system

Info

Publication number: CN211821768U
Application number: CN201921811437.8U
Authority: CN
Inventors: 周明弘; 范一鸣; 刘文瀚
Original assignee: Liaoning Golden Carbon Management Co ltd
Current assignee: Liaoning Golden Carbon Management Co ltd
Priority date: 2019-10-26
Filing date: 2019-10-26
Publication date: 2020-10-30
Anticipated expiration: 2029-10-26

Abstract

The utility model discloses a LED lighting system, including explosion-proof box, optic fibre-LED coupling device, LED encapsulation entity, optic fibre and lamps and lanterns, optic fibre-LED coupling device and LED encapsulation entity all arrange in the explosion-proof box, the lamps and lanterns are external, optic fibre is connected between optic fibre-LED coupling device and the lamps and lanterns, on the one hand separates the illumination light source circuit from the illumination lamps and lanterns ingeniously, has overcome the easy electric leakage drawback of traditional miner's lamp; on the other hand, the transmission optical fiber and the lighting lamp have small volume and light weight, and the defect of poor comfort of the traditional miner lamp is overcome.

Description

LED lighting system

Technical Field

The utility model relates to a LED equipment specifically is a LED lighting system.

Background

In recent years, the coal mine safety accidents in China are frequent, and most of the accidents are caused by gas contacting with electric sparks. According to investigation, a considerable part of the mine lamp is caused by the mine lamp carried by miners (about 30 percent approximately), and the main reasons are that the design of the mine lamp has defects, and the anti-insulation materials of a lead, a power supply and the like do not reach the standard, so that electric sparks are caused, and explosion is caused after the mine lamp contacts gas; in addition, the method has various disadvantages of poor stability, short service life, poor applicability and the like. The optical fiber illumination is a new development of the optical fiber application technology in recent years and is a new favorite of the illumination technology. It has two application modes of end point light emitting and body light emitting. For the former, the basic principle is by a light-gathering device. The light emitted by the light source is coupled into the plastic optical fiber, transmitted through the optical fiber and converted into light meeting the requirements of specific lighting environment by a certain secondary light distribution system. The plastic optical fiber has the advantages of non-conductivity, no heating, soft material, flexibility and the like, thereby being widely applied to industry and scientific research.

To these defects of traditional miner's lamp and to the comprehensive analysis of the development trend of lighting technology, the utility model provides a novel optic fibre-LED miner's lamp design based on optic fibre lighting technology has realized its principle appearance lamp, adopts the high efficiency Light Emitting Diode (LED) light source with drive circuit integrated design at energy supply power box end, utilizes the plastic optical fiber coupling that the flexibility is good, transmission efficiency is high, reasonable price to export light, and convey to the passive illumination lamps and lanterns of miner's cap end, realize the miner's light. On one hand, the scheme skillfully separates the lighting source circuit from the lighting lamp, thereby overcoming the defect that the traditional miner lamp is easy to leak electricity; on the other hand, the transmission optical fiber and the lighting lamp have small volume and light weight, and the defect of poor comfort of the traditional miner lamp is overcome. The design is the specific application of the optical fiber lighting technology in the design of the miner lamp, has very wide application value and has very important social significance.

SUMMERY OF THE UTILITY MODEL

Because so, the utility model provides a following technical scheme: an LED lighting system comprises an explosion-proof box, an optical fiber-LED coupling device, an LED packaging entity, an optical fiber and a lamp, wherein the optical fiber-LED coupling device and the LED packaging entity are arranged in the explosion-proof box, the lamp is external, and the optical fiber is connected between the optical fiber-LED coupling device and the lamp.

Further, preferably, the optical fiber-LED coupling device includes a metal base, a light reflecting bowl, a lens, a clamping groove, a fixing bolt, and an LED single body, one end of the optical fiber extends into the clamping groove, and the LED single body is located on the metal base.

Further, preferably, the number of the LED single bodies is 3 and the LED single bodies are distributed in a delta shape, and the LED single bodies include an LED metal-based heat sink.

Further, preferably, a light reflecting bowl is installed on each LED metal-based heat sink, the LED chip is located at the focal position of the light reflecting bowl, the light reflecting bowl and the LED chip are located inside the clamping groove, and the lens is arranged on the light reflecting bowl and fixed with the inner wall of the clamping groove through the light reflecting bowl.

Further, preferably, the diameter of the slot is the same as that of the optical fiber, the optical fiber passes through the slot, and the front end face of the optical fiber is located at the focal point of the lens.

Further, preferably, the light reflecting bowl is used for collecting and collimating light rays emitted by the LED chip, and the lens focuses collimated approximately parallel light into the optical fiber.

Further, preferably, the optical fiber is a plastic optical fiber.

Further, preferably, a power supply in the LED lighting system is a lithium battery, and the LEDs are driven by a constant current driving method.

Further, the lithium battery charging circuit preferably uses LTC4059 chips from lite corporation.

The utility model has the advantages that: on one hand, the lighting source circuit is skillfully separated from the lighting lamp, so that the defect that the traditional miner lamp is easy to leak electricity is overcome; on the other hand, the transmission optical fiber and the lighting lamp have small volume and light weight, and the defect of poor comfort of the traditional miner lamp is overcome.

Drawings

FIG. 1 is a schematic diagram of an LED lighting system;

FIG. 2 is an overall block diagram of an LED lighting system;

fig. 3 is a 1W LED driving circuit of the present invention;

fig. 4 is a lithium battery driving circuit of the present invention;

fig. 5 is a control circuit of the present invention;

fig. 6 is a diagram of the arrangement of LEDs according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 shows the whole structure of the novel miner's lamp. From the appearance structure, the miner's lamp consists of three parts, namely an explosion-proof box, a transmission optical fiber and a lighting lamp. From the functional technology, the miner lamp consists of four parts, namely a power supply circuit, an optical fiber-LED coupling device, a transmission optical fiber and a lamp secondary light distribution system, wherein the power supply circuit comprises a lithium battery charging circuit, an LED driving circuit and a control circuit. Different from the traditional LED mine lamp, the design centralizes the lithium battery, the charging circuit, the driving circuit and the optical fiber-LED coupling device in the explosion-proof box, and the outer part of the explosion-proof box only carries out light transmission and secondary conversion, thereby realizing the innovative design of separating the lighting source from the lighting lamp and the innovative design of integrating the lighting source with the driving circuit. The circuit part, the optical fiber-LED coupling device, the transmission optical fiber and the 4 parts of the secondary light distribution system of the lamp are respectively described below.

According to the standard KL type miner's lamp of the coal industry of the people's republic of China issued by the Council of national development and reform in 2004, when the capacity of the storage battery is 13Ah, the rated voltage of the LED is 3.7V, the power is not less than 0.4W, the maximum illumination at the position 1m away from the lamp holder is more than 1400lx at the beginning of the lamp, and more than 900lx after 11 h. The lithium battery has the advantages of small volume, light weight, high energy ratio, long service life, no pollution and the like, so the design selects the lithium battery (group) as the storage battery. At present, the working voltage of the white light LED is between 3V and 4V, the rated voltage is 3.6V, the white light LED meets the national standard, and meanwhile, in order to meet the illumination requirement, a plurality of LEDs are selected to be connected in parallel in the design. In order to ensure that the luminous flux is not lower than 25lm when the illuminance of the miner's lamp is more than 1000lx, about 20 percent of the total luminous flux should be considered as surplus. The optical fiber-LED lithium battery miner lamp selects three 1W white light LED monomers as light sources, the working voltage of each LED is 3.1V to 3.7V, and the working current is 350 mA. The circuit part adopts 1 charging circuit board to charge a large-capacity lithium battery (group), the lithium battery supplies power to the driving board, then drives three 1 WLEDs and is connected with the driving board and controlled by the control circuit, and the general block diagram is shown in figure 2.

The brightness of the LED is proportional to the driving current, so that stable illumination requires a constant current driving method. The design is based on the circuit of LTC3215 chip produced by Linte corporation, as shown in FIG. 3. The LTC3215 is a chip specially used for driving a high-power LED, has a wide voltage input range of 2.9-4.4V, is matched with the input voltage of the existing popular lithium battery, has the characteristics of pulse output current up to 700mA at most, continuous output current up to 350mA, static power consumption as low as 2.5uA, open circuit of the LED, short circuit protection and overheating protection. The chip output current can be accurately set through programming the resistor Rset, the relationship between the output current and the resistor is 3990/R (R unit k Ω, I unit mA), the LED working current is 350mA, Rset is calculated to be 11.4k Ω, and the standard value is 11.5k Ω. The drive circuit has the characteristics of constant current output, stable work, high efficiency of 90 percent, few peripheral devices and simple circuit.

The lithium battery charging circuit is designed by using LTC4059 chips of Linte corporation, as shown in FIG. 4. LTC4059 is an intelligent chip specially used for lithium battery charging, and can adapt to 3.75-8V input electricityThe voltage changes, modes such as vortex charging, constant-current charging, constant-voltage charging and the like can be automatically selected according to the voltage of the rechargeable battery, the maximum charging current can reach 900mA, and the static power consumption is as low as 10 uA. Can be programmed through the resistor R_PROGSetting a charging current with a relation of I_BAT＝1000×V_PROG/R_PROGIn the formula V_PROG＝1.21V， I_BATWhen the power is 900mA, R_PROG1.34K Ω. The charging circuit is characterized in that: peripheral components are very few, and the method is simple and convenient; the input voltage is 3.75V-8V, which is convenient for supplying power by using the common 5VDC voltage, and a charging prompt and alarm circuit can be added on the basis of the circuit.

The main function of the control circuit is to realize the switching of three lamps on, 1 (or 2) lamps on and three lamps off, namely the function of the main and auxiliary lamps specified in the standard of miner's lamps. The implementation method of the control circuit is various, and a control circuit using a four-pole double-throw (4P2T) switch design is provided, as shown in FIG. 5. The parts marked with the third part represent the whole series connection of the driving circuit and the LED with corresponding numbers, and black and white circles represent switch pins.

The design of the novel miner's lamp also pays attention to the overall energy utilization rate of the novel miner's lamp while showing the safety of the novel miner's lamp, and the energy utilization rate is mainly reflected in the efficiency of coupling light emitted by the LED monomer into an optical fiber. The basic structure of the device is composed of a metal base, a reflecting bowl, a lens, a clamping groove and a fixing bolt, wherein one end of the optical fiber extends into the clamping groove, and the LED single body is arranged on the metal base (figure 6). The three LED single bodies are arranged on the metal base in a structure like the Chinese character 'pin' and are fixed through fixing bolts; in order to improve the coupling efficiency, a reflecting bowl is arranged on each LED metal-based heat sink, an LED chip is positioned at the focal point of the reflecting bowl, the reflecting bowl and the LED chip are positioned in a clamping groove, a lens is arranged on the reflecting bowl and fixed with the inner wall of the clamping groove through the reflecting bowl, the diameter of the clamping groove is the same as that of the optical fiber, the optical fiber penetrates through the clamping groove, and the front end face of the optical fiber is positioned at the focal point of the lens. The light reflecting bowl is used for collecting light rays emitted by the LED chip and collimating the light rays, the lens focuses the collimated approximately parallel light rays into the optical fiber so as to improve the coupling efficiency, and the clamping groove and the bolt jointly play a role in fixing and enable the optical fiber and the LED monomer to achieve the effect of coaxial connection.

And (3) performing analog simulation on a single optical fiber-LED coupling device in the miner lamp by using optical simulation software TracePro. And (3) introducing the part of the three-dimensional model into TracePro, establishing a light distribution model, and defining parameters such as surface properties, surface luminous flux of the LED chip and the like, so that analog simulation can be performed. The LED chip is arranged to be 1mm multiplied by 0.1mm, the other 5 surfaces except the back surface are all Marble light sources, the total emergent ray of the luminous surface is set to be 50000, the total luminous flux is 90lm (distributed to each surface of the chip according to the area), and the inner surface of the reflecting bowl is a total reflecting mirror. Most of light emitted by the LED with the reflecting bowl and the lens can enter the optical fiber for transmission, and only a small part of light is diffused out, so that the coupling efficiency is high.

The illumination light emitted from the explosion-proof box needs to be transmitted to the lamp cap part through the optical fiber, and the optical fiber is required to have high light receiving capacity, low loss, diameter suitable for being coupled with a light source and good flexibility so as to realize flexible transmission of the illumination light. The design selects the Plastic Optical Fiber (POF), and the practicability and the economy of the miner lamp are enhanced while the optical coupling efficiency is improved by utilizing the advantages of large core diameter, good flexibility, large numerical aperture, strong plasticity, light weight, low price and the like of the POF. Each LED monomer is coupled by one optical fiber through an optical fiber-LED coupling device, the three optical fibers are bundled and parallel to guide illumination light to the lamp holder from the explosion-proof box, and secondary processing is carried out by the lamp holder light distribution system, so that the emergent light spots are proper in size and uniform in illumination. The light receiving capacity of the optical fiber is determined by the Numerical Aperture (NA) and the core diameter (a), and the larger the NA and the core diameter are, the stronger the light receiving capacity is, and the higher the optical coupling efficiency is; the light transmission performance of an optical fiber is determined by its loss characteristics. The diameter of the core is selected by considering the diameter of the selected LED single body, and for the LED single body with the diameter of about 1mm multiplied by 0.1mm, a plastic optical fiber with the diameter of 3mm and the NA of 0.5 can be selected. The illumination quality of the miner's lamp is mainly reflected in the aspects of spot size, illumination uniformity, system light utilization efficiency and the like, generally, the radius of a spot is required to be about 120mm, the illumination is uniform, and the high light utilization rate is favorable for saving electricity. In the design, the illuminating light is transmitted to the lamp part through the three plastic optical fibers, the divergence full angle of the light output by the optical fibers is 2 theta (60 degrees) (NA (0.5)), the radius of a light spot at one meter away from the lamp reaches 1/3 (approximately equal to 0.58 m), and the size and the illumination of the light spot are not satisfactory at the moment. Therefore, a light distribution system is required to be designed to process the emergent light, so that the spot size is appropriate and the illumination intensity is uniform. The combination of the conical reflecting cavity and the Fresnel lens is used as a light distribution system, the emergent end face of the optical fiber is arranged at the focus of the lens, and a mechanical spiral device is designed to control the distance between the lens and the emergent end face of the optical fiber, so that the size of a light spot is adjusted. Compared with the traditional miner's lamp, the lamp of the design does not contain a driving circuit and a light source, so that the lamp has smaller volume and lighter weight.

The radius of a small hole at the bottom of the conical cavity is 1.5mm, the radius of the top of the conical cavity is 10.5mm, the length of the conical cavity is 15mm, the Fresnel lens is made of PMMA material, the caliber is 21mm, the thickness is 1.5mm, the ring distance is 0.5mm, and the rest of the Fresnel lens are provided with the same coupling part. If the radius of the light spot is defined as the radius of the area with the illumination value in the light spot not less than 20% of the central illumination value, and the light utilization efficiency is defined as the ratio of the luminous flux received by the test surface to the luminous flux emitted by the LED chip, the simulation result shows that the light utilization efficiency is 42.94%, the radius of the light spot is about 140mm, the illumination is uniform, and the requirement on the illumination quality of the miner lamp is basically met.

The above description is only for the preferred embodiment of the present invention, and the structure is not limited to the above-mentioned shape, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An LED lighting system is characterized by comprising an explosion-proof box, an optical fiber-LED coupling device, an LED packaging entity, optical fibers and a lamp, wherein the optical fiber-LED coupling device and the LED packaging entity are arranged in the explosion-proof box, the lamp is external, the optical fibers are connected between the optical fiber-LED coupling device and the lamp, the optical fiber-LED coupling device comprises a metal base, a reflecting bowl, a lens, a clamping groove, a fixing bolt and LED monomers, one end of each optical fiber extends into the clamping groove, the LED monomers are positioned on the metal base, the number of the LED monomers is 3 and distributed in a shape like a Chinese character 'pin', each LED monomer comprises an LED metal base heat sink, the reflecting bowl is arranged on each LED metal base heat sink, an LED chip is positioned at the position of a reflecting bowl focus, the reflecting bowl and the LED chip are both positioned in the clamping groove, the lens is arranged on the reflecting bowl, the LED lighting system is characterized in that the LED lighting system is fixed with the inner wall of a clamping groove through a light reflecting bowl, the diameter of the clamping groove is the same as that of an optical fiber, the optical fiber penetrates through the clamping groove, the front end face of the optical fiber is located at the focus of a lens, the light reflecting bowl is used for collecting light rays emitted by an LED chip and collimating the light rays, the lens focuses the collimated approximately parallel light into the optical fiber, a power supply in the LED lighting system is a lithium battery, the LED is driven in a constant current driving mode.

2. An LED lighting system according to claim 1, wherein: the lithium battery charging circuit adopts an LTC4059 chip of Linte company.