WO2009039715A1

WO2009039715A1 - A heat dissipating method for led lamp by use of air pressure and wind tunnel

Info

Publication number: WO2009039715A1
Application number: PCT/CN2008/000375
Authority: WO
Inventors: Qilin Wang
Original assignee: Qilin Wang
Priority date: 2007-09-25
Filing date: 2008-02-21
Publication date: 2009-04-02

Abstract

A heat dissipating method for a LED lamp by use of air pressure and wind tunnel, wherein the casing (14) of the LED lamp, a circuit board (11) within the casing (14), a heat dissipating plate (10) on a power supply and a constant current source (12) constitute an airflow passage (6), a heat sink (8) is located in an airflow passage (6) and connected to the heat dissipating plate (10), an air inlet aperture (4) is located at the lamp cap and communicated with the airflow passage (6), the aperture diameter of the air inlet aperture (4) is matched with the diameter of a vent pipe, a supporting pole or an electricity pylon (2), the vent pipe, the supporting pole or the electricity pylon (2) is a hollow pipe and is communicated with the airflow passage (6) via the air inlet aperture (4), an air inlet opening (1) is located at the lower end of the vent pipe, the supporting pole or the electricity pylon (2), an air outlet aperture (7) is located at the other end of the airflow passage (6) on the casing (14), as a result of the difference in height of the vent pipe, the supporting pole or the electricity pylon (2), the pressure difference of the cooling air flow can cause nature rise of air in the passage formed by the hollow pipe, an air flow can be formed in the airflow passage (6), heat generated by the circuit board, the power supply and the constant current source can be exhausted out of the casing at any moment, and heat dissipation for a high-power LED lamp is achieved.

Description

LED lamp heat dissipation method using air pressure and wind tunnel

Technical field

The present invention relates to a method of dissipating a semiconductor LED (Lingt emitting diode) lamp using air pressure and a wind tunnel.

Background technique

LED lights consume low power and have huge energy savings. A 100W height is 8 meters from the ground, the illumination is 30LUX, and the luminous light is 4800LM. Compared with the LED lamp of the same indicator, the LED lamp consumes only one-fifth of the energy-saving lamp, and the ordinary tungsten lamp One-twentieth to one-thirtieth. LEDs also have the advantages of long life, small size, and strong design (ie, the random arrangement of illumination light). In the past ten years, many countries in the world have invested heavily in the further development of the potential advantages of LEDs and the industrialization of high-power, high-efficiency LED chip production technology. For example, in Japan in 1998, the United States launched the "National Semiconductor Lighting Program" in 2000. China's 2001 863 Program was established, and in June 2003, the National Semiconductor Lighting Project was launched. Nowadays, due to the number of chips, carrier injection, and the ratio of excitation source and brightness of different colors, the manufacturing process has been gradually solved and mastered, so that the LED lamp achieves low voltage, high efficiency and volume. Small, stable performance, short response time, and variable color. As the power source of the LED illuminator, that is, voltage and current are the key to the LED lamp. The power supply and constant current source are composed of many electronic devices. The heat generated by them in the work causes the electronic devices to be damaged, which directly affects the performance of the whole system and even the life. LED lamps that could work normally for more than 50,000 hours are difficult to discharge due to high heat in the work. It is difficult to break through 10,000 hours in practical applications, and some can only emit light after only a few hundred hours of operation. In order to solve the heat emitted by the LED lamp during the illuminating process and the heat emitted by the LED illuminating circuit system, the world's high-power LED lamps above 10W basically divide the power source, the constant current source and the LED into two parts. Assemble, disperse heat. In solving the heat dissipation problem, the method of dissipating heat through the heat sink in the form of an arc on the back side of the LED illuminator is used. In order to achieve a certain heat dissipation area, the volume is large and the weight is heavy. Not only is the cost high, the use is inconvenient, and the volume is large, and the problem of how to operate the full circuit at a normal temperature with sufficient heat dissipation area or heat dissipation mode has not been fundamentally solved. This defect has largely limited the widespread use of LED lamps. This is one of the reasons why LED lamps, especially high-power LED lamps, cannot be universally applied and promoted. The second reason is that LED lamps are expensive because of the high price of LED illuminators themselves, and the independent fabrication and assembly of power sources and constant current sources to reduce heat build-up during luminaire manufacturing and assembly. Special installation equipment also keeps prices high. The key to heat dissipation depends on the heat sink material and heat dissipation area and ventilation. The air convection heat dissipation is the forbidden zone of the LED lamp. In order to prevent the air from entering the LED lamp, the protection circuit and the electrical components are not oxidized and corroded, and almost all of them are sealed, and the waterproof performance is emphasized, which causes difficulty in heat dissipation. At present, the application of LED lights in the world is limited to power below 10W. How to solve the above-mentioned problems in LED lighting technology, so that LED lamps, especially high-power LED lamps, can be widely applied and promoted. The focus of attention and conquer in technology.

Summary of the invention

The object of the present invention is to design a heat dissipation structure for an LED lamp using air pressure and a wind tunnel, and applying a gas pressure of the air to form a gas flow in the wind tunnel, so that the low temperature gas in the body enters the LED lamp body due to the cold gas. Flow and exchange take away hot air, accelerate heat dissipation and increase heat dissipation area and ventilation level, and solve the problem of heat dissipation of LED lamps above 52W.

The solution of the invention is: an air flow passage is formed by the tubular LED lamp housing and the circuit board in the housing, the power supply and the heat dissipation plate on the constant current source assembly, and an air inlet hole and an air flow passage are connected at the lamp end, The diameter of the air inlet hole matches the diameter of the air duct or the support rod or the utility pole, and the air duct or the support rod or the electric pole is a hollow tube that communicates with the air flow passage through the air inlet hole, in the air duct or the support rod or the electric pole The air inlet is opened at the lower end, and the air outlet is opened at the other end of the air flow passage on the casing, and the air flow is formed in the hollow tube due to the difference in air pressure formed by the height of the air duct or the support rod or the electric pole. The passage naturally rises, forming a wind flow in the air flow passage formed by the air duct or the support rod or the electric pole and the lamp shell, and the heat generated by the operation of the circuit board, the power source and the constant current source assembly is taken out of the casing at any time to achieve heat dissipation.

DRAWINGS

Figure 1 LED lamp uses the air pressure and wind tunnel heat dissipation schematic.

Figure 2 Schematic diagram of the 51W LED lamp structure.

Figure 3 51W LED lamp A-A surface structure diagram.

Figure 4 Power and constant current source circuit diagram.

1. Air inlet, 2. Support rod or utility pole, 3. Channel, 4. Air inlet hole, 5. Lamp cover, 6. Air flow passage, 7. Air outlet hole, 8. Inner fin, 9. LED light illuminator, 10. Aluminum heat sink, 11. Circuit board, 12. Power supply and constant current source integrated components, 13. Cartridge heat sink, 14. Housing 15. Cover, 16. Shade

detailed description

In this embodiment, a 52W horizontal LED lamp is taken as an example. Referring to Figures 1, 2 and 3, the horizontal LED lamp with air flow passage according to the present invention is a cylindrical casing 14 having a heat dissipation function, a power source and a constant current. The source integration component 12, the LED illuminator 9, the circuit board 11, the aluminum heat sink 10, the inner heat sink 8, the lamp cap 5, the air inlet hole 4, the air outlet hole 7, the cover plate 15, and the lamp cover 16;

An air flow passage 6 is formed by the cylindrical LED lamp housing 14 and the circuit board 11 in the housing, the aluminum heat sink 10 on the power supply and the constant current source integrated assembly 12, and the inner heat sink 8 is vertically fixed in the air flow passage 6. The lamp cap 5 is fixed at one end of the housing 14, and the air inlet hole 4 is connected to the center of the cap 5, and is empty The air flow passage 6 is connected, the diameter of the air inlet hole 4 is matched with the diameter of the support rod or the electric pole 2, and the center of the support rod or the electric pole 2 is a hollow tube passage 3, and communicates with the air flow passage 6 through the air inlet hole 4, in the support The air inlet 1 is opened at the lower end of the rod or the electric pole, and the air outlet hole 7 is opened at the other end of the air flow passage 6 on the casing. The circuit board 11 is fixed on the aluminum heat sink 10, and the LED lamp illuminator 9 is fixed at On the circuit board 11, in a space constituted by the cover 15 and the globe 16, the power source and the constant current source integrated assembly 12 are placed in a vacant chamber constituted by the cylindrical heat sink 13. The power supply and the constant current source integrated component are composed of a constant current source and a power supply two-part circuit;

The constant current source circuit is as follows:

The 1 pin of the resistor R2 is connected to the positive pole of the LED illuminator and connected to the positive pole of the +24V power supply; the 1 leg of the resistor R2 is connected to the connection point of the 2 pin of the transistor Q2 and the 1 pin of the transistor Q3; the 1 pin and the resistor of the transistor Q2 The 1 pin of R6 is connected to the 3 pin of the transistor Q3. The 1 pin of the resistor R7 is connected to the pin 1 of the transistor Q2 and the pin 3 of the transistor Q3. The 3 pin of the transistor Q2, the 2 pin of the resistor R6, and the resistor R7 2 feet of grounding; 2 feet of triode Q3 are connected to the negative pole of the LED illuminator;

Power circuit such as:

The 1 pin of the capacitor C1 is connected to the 1 pin of the vortex ring T1 and the mains +220V; the 2 legs of the capacitor C1 are respectively connected with the 2 pin of the vortex ring T1 and the mains-220V; the 3 pin of the vortex ring T1 and the temperature resistance RT 1 pin connection; 2 pin of temperature resistor RT is connected with pin 1 of rectifier D1; pin 4 of vortex ring T1 is connected with pin 3 of rectifier D1; pin 4 of rectifier D1 is grounded; pin 2 of rectifier D1 is connected to regulator tube D2 The 2 pin and the transformer T2 are connected to the 1 pin of the capacitor C2, and the 2 pin of the capacitor C2 is grounded; the 1 pin of the Zener diode D2 is connected to the 2 pin of the fast recovery diode D3; the 1 leg of the fast recovery diode D3 is connected. The 2 pin of the transformer T2 is connected to the 1 pin of the pulse width modulation converter Q1; the 2 pin of the pulse width modulation converter Q1 is grounded; the 3 pin of the pulse width modulation converter Q1 is connected to the 3 pin of the optocoupler U2 and the resistor R5 Foot connection After the contacts are connected to a pin diode _D6, 2 feet grounded diode D6; resistor R5 pin 2 to the capacitor 1 foot-C8; 2 feet capacitor C8, and a foot capacitor C7, the capacitor 2 feet C5, the transformer T2 6 pin ground; 3 pin of transformer T2 is connected with pin 1 of fast recovery diode D5; pin 2 of fast recovery diode D5 and pin 1 of capacitor C3, pin 1 of L1, pin 1 of optocoupler U2, pin 1 of diode D7 Connection; 4 pin of transformer T2, pin 2 of capacitor C3, pin 2 of capacitor C4 are grounded; pin 5 of transformer T2 is connected with pin 1 of diode D4; pin 2 of diode D4, pin 1 of capacitor C5, optocoupler U2 4 pin connection; 6 pin of transformer T2, pin 2 of capacitor C5 is grounded; pin 2 of optocoupler U2 is connected with one end of resistor R1; the other end of resistor R1, pin 3 of voltage reference U1, pin 2 of diode D7, capacitor C6 pin 1 connection; voltage reference U1 pin 2, capacitor C7 pin 2, resistor R4 pin 2 connected to ground; voltage reference U1 pin 1 connection capacitor C6 pin 2 and resistor R4 pin 1 and resistor R3 pin 2 connection; Inductor L1 pin 2 connection resistor R3 pin 1 and capacitor C4 pin 1 connection, and then connected to the +24V power supply positive, capacitor C4 2 Ground.

Industrial applicability

At an ambient temperature of 22 °C, the normal 52W LED lamp is used for 3 hours or until it is no longer warmed up. The maximum temperature of the heat sink close to the LED is 76 °C, which is beyond the normal use of the LED.

The LED lamp modified by the method of the present invention has a maximum temperature of 68 ° C after 3 hours of use without the air inlet being connected.

After the air inlet is connected, the maximum ambient temperature is 22 °C and the minimum temperature is 8 °C. After several days and nights of continuous use, the maximum temperature of the LED heat sink is 46 °C, which can be cooled by 30 °C. The lamp is 6M above the ground and reaches the optimum operating temperature of the LED below 55. If the radiator is used for heat dissipation, the heat dissipation area of the lamp needs to be more than doubled, and the volume and weight are more than doubled. This not only increases the production cost, but also is cumbersome and causes great inconvenience to the installation. According to the invention, it is only necessary to screw the LED lamp onto the pole. According to the long-term test, in addition to the LED close to the heat sink, the LED surface will change with the ambient temperature. The heat sink board that the LED is in close contact with, due to the large heat release of the LED, the ambient temperature changes, and the temperature of the heat sink is hardly affected. From 8 ° C to 22 ° C, the heat sink is always kept at 46 ° C.

The LED lamp of the same power, the higher the height of the support rod or the pole of the lamp, the better the heat dissipation effect. For every 1 meter increase in the height of the lamp support bar or utility pole, the highest temperature range of the LED lamp can be cooled by more than 1 °C. As the power of the LED lamp increases, the tube diameter increases appropriately. The support rod or the electric pole tube of the LED lamp can be made of an iron tube, preferably an aluminum tube, which can help the LED lamp to conduct heat. When the LED lamp is connected to the appropriate ventilation pipe, the height of the LED lamp is increased without using the lamp post, and the heat dissipation capability of the LED lamp is also increased, which has the same effect as the lamp post. In high buildings, as long as the 1.5 5-2M long ventilation pipe (straight pipe or elbow, hose or pipe) can be installed, the addition of the ventilation pipe to the pole has the same function. This LED can also be mounted in a house that can hold a pole of 2 meters or more. This tube can be used as a support rod.

The use of air and wind tunnel LED lights, really solve the big problem of high-power LED lights cooling, so that not only can use high-power LED lights on advertising lights, street lights, high pole lights, but also can be operated at airports, stadiums, hospitals The LED high power lamp can be used in rooms, theaters, conference hall tunnels, and warships.

The use of air pressure and wind tunnel LED lights to solve the practical benefits of LED lamp heat dissipation: First, the high-power LED lamps can be popularized; Second, LED lamps can be manufactured in kilowatts; Third, reduce weight and reduce costs, (Taiwan has a home 200W LED lights, weighing more than 20 kg). For the 52W LED lamp tested above, for example, only the heat dissipation part weighs 1. 87 kg, which is RMB 52.32. If you do not use the air pressure and wind tunnel LED light, reach the highest temperature range below 55 ° C, the heat dissipation area. Need to increase more than 1 time, increase the cost of 52. 32 yuan, the most important thing is to increase the weight. The higher the power of the LED lamp, the more the weight of the LED lamp increases, and the larger the volume and weight. The 100W LED lamp that uses air pressure and wind tunnel is only less than 3 kilograms. Single radiator Cost savings of more than 100 yuan.

Using the LED lights of the air pressure and wind tunnel, the maximum temperature of the LED lamp (that is, the temperature of the aluminum substrate and the LED itself when the LED is in operation) generally does not exceed 50 ° C, which is more than the LED safety range of 55 ° C. Low, thus ensuring the service life of the LED is more than 6 to 100,000 hours.

Claims

Rights request

A heat dissipation method for an LED lamp using a gas pressure and a wind tunnel, characterized in that: an air flow passage is formed by a cylindrical LED lamp housing and a circuit board in the housing, a power supply, and a heat dissipation plate on the constant current source assembly. The air inlet hole is connected with the air flow passage, and the air inlet hole has a hole diameter matching the diameter of the air duct or the support rod or the electric pole. The air duct or the support rod or the electric pole is a hollow tube, and passes through the air inlet hole and the air. The flow passage is connected, and an air inlet is formed at a lower end of the air duct or the support rod or the electric pole, and an air outlet is opened at the other end of the air flow passage on the casing, and the cold air flow is due to the air duct or the support rod or the electric pole The upper and lower air pressure difference formed by the height causes the air to naturally rise in the passage formed by the hollow tube, and a wind flow, that is, a wind tunnel, is formed in the air flow passage, and the heat generated by the operation of the circuit board, the power source and the constant current source is taken out of the casing at any time. Achieve heat dissipation.

2. The method according to claim 1, wherein the air duct is a hose or a hard tube.

3. The LED lamp for cooling a LED lamp using air pressure and a wind tunnel according to claim 1, wherein: the tubular housing 14 having a heat dissipation function, the power source and the constant current source integrated component 12,

LED illuminator 9, circuit board 11, aluminum heat sink 10, inner heat sink 8, lamp cap 5, air inlet hole 4, air outlet hole 7, cover plate 15, lamp cover 16;

An air flow passage 6 is formed by the cylindrical LED lamp housing 14 and the circuit board 11 in the housing, the aluminum heat sink 10 on the power supply and the constant current source integrated assembly 12, and the inner heat sink 8 is vertically fixed in the air flow passage 6. The lamp cap 5 is fixed at one end of the casing 14, and the air inlet hole 4 is connected to the center of the cap 5, and communicates with the air flow passage 6. The diameter of the air inlet hole 4 matches the diameter of the support rod or the electric pole 2, and the support rod Or the center of the utility pole 2 is a hollow tube passage 3, communicates with the air flow passage 6 through the air inlet hole 4, and an air intake port 1 is opened at the lower end of the support rod or the utility pole, and the other end of the air flow passage 6 is provided on the casing. Open The air outlet hole 7, the circuit board 11 is fixed on the aluminum heat sink 10, and the LED lamp illuminator 9 is fixed on the circuit board 11, in the space formed by the cover 15 and the lamp cover 16, the power source and the constant current source integrated component 12 It is placed in an empty chamber formed by the cylindrical heat sink 13.

4 . The LED lamp of claim 3 , wherein the power source and the constant current source integrated component are composed of a constant current source and a power supply;

The constant current source circuit is as follows:

The 1 pin of the resistor R2 is connected to the positive pole of the LED illuminator and is connected to the positive pole of the +24V power supply; the 1 leg of the resistor R2 is connected to the connection point of the 2 pin of the transistor Q2 and the 1 pin of the transistor Q3; the 1 pin and the resistor of the transistor Q2 The 1 pin of R6 is connected to the 3 pin of the transistor Q3. The 1 pin of the resistor R7 is connected to the pin 1 of the transistor Q2 and the pin 3 of the transistor Q3. The 3 pin of the transistor Q2, the 2 pin of the resistor R6, and the resistor R7 2 feet of grounding; 2 feet of triode Q3 are connected to the negative pole of the LED illuminator;

Power circuit such as:

The pin 1 of the capacitor C1 is connected to the 1 pin of the vortex ring T1 and the mains +220V; the 2 legs of the capacitor C1 are respectively connected with the 2 pin of the vortex ring T1 and the mains-220V; the 3 pin of the vortex ring T1 and the temperature resistance RT 1 pin connection; 2 pin of temperature resistor RT is connected with pin 1 of rectifier D1; pin 4 of vortex ring T1 is connected with pin 3 of rectifier D1; pin 4 of rectifier D1 is grounded; pin 2 of rectifier D1 is connected to regulator tube D2 The 2 pin and the transformer T2 are connected to the 1 pin of the capacitor C2, and the 2 pin of the capacitor C2 is grounded; the 1 pin of the Zener diode D2 is connected to the 2 pin of the fast recovery diode D3; the 1 leg of the fast recovery diode D3 is connected. The 2 pin of the transformer T2 is connected to the 1 pin of the pulse width modulation converter Q1; the 2 pin of the pulse width modulation converter Q1 is grounded; the 3 pin of the pulse width modulation converter Q1 is connected to the 3 pin of the optocoupler U2 and the resistor R5 After the connection point of the pin is connected to pin 1 of diode D6, pin 2 of diode D6 is grounded; pin 2 of resistor R5 is connected to pin 1 of capacitor C8; pin 2 of capacitor C8, pin 1 of capacitor C7, pin 2 of capacitor C5, Transformer T2 6 The ground of the foot is connected; the 3 pin of the transformer T2 is connected to the 1 pin of the fast recovery diode D5; the 2 pin of the fast recovery diode D5 is connected with the 1 pin of the capacitor C3, the 1 pin of the L1, the 1 pin of the optocoupler U2, and the 1 pin of the diode D7. 2 pin of transformer T2, pin 2 of capacitor C3, pin 2 of capacitor C4 are grounded; pin 5 of transformer T2 is connected with pin 1 of diode D4; pin 2 of diode D4, pin 1 of capacitor C5, 4 of optocoupler U2 Pin connection; 6 pin of transformer T2, pin 2 of capacitor C5 is grounded; pin 2 of optocoupler U2 is connected with one end of resistor R1; the other end of resistor R1, pin 3 of voltage reference U1, pin 1 of diode D7, capacitor C6 1 pin connection; voltage reference U1 pin 2, capacitor C7 pin 2, resistor R4 pin 2 connected to ground; voltage reference U1 pin 1 connection capacitor C6 pin 2 and resistor R4 pin 1 and resistor R3 The 2-pin connection of the inductor L1 is connected to the 1 pin of the resistor R3 and the 1 pin of the capacitor C4, and then connected to the positive terminal of the +24V power supply, and the 2 pin of the capacitor C4 is grounded.