Issues related to LED street light inductance

 The LED street light market, the basic use of HID light source with flip flops and inductance ballast model. This model although existing energy efficiency is low and the strobe. However, the use of electronic drive circuit LED street lights, in the field when the use of lighting, the threat of its plasticity is an important aspect of the problem of lightning.

Because of the lightning in the air is a broad spectrum of radio waves, and the overhead LED street lamp power supply lines, can be very good to receive radio waves. Receiving two power lines from the same lightning radio waves, to drive circuit in terms of is belongs to the common mode interference signal, the common mode interference of up to hundreds of volts to thousands of volts, it is easy to breakdown driving circuit of EMC connected capacitor or smaller (shell) clearance, resulting in damage to the drive circuit.

Also due to China's power supply line three-phase four wire system with neutral line connected to the polarity of the power supply, so in two overhead power transmission line segments, the moment of radio waves in the induction lightning, due to the different of the two power cables on the instantaneous impedance for the two power cables between a difference mode interference voltage and the instantaneous differential mode interference voltage can also be reached hundreds of volts to 3000 many volts. This voltage tend to breakdown drive circuit in the power rectifier diode and the printed circuit board of different polarity electrode clearance, LED controller will also make damage to a driving circuit.

To solve this problem, the input of the driving circuit must be in the LED, and then the fast response of the voltage sensitive resistor is connected in order to ensure the discharge of the differential mode interference. Due to lightning induced interference is repeated many times, when the interference voltage is high, the varistor instantaneous guide through vent discharge current can be large, so the varistor should not only have rapid response ability, should also be equipped with instantaneous turn-on tens of AMPS discharge capacity and can not be damaged. In addition to the varistor, LED drive circuit of input should also combined with the protection of conduction interference (EMI), design composite LC network, so that the LC network can not only hinder internal EMI of power leakage, and obvious inhibitory effect on lightning interference signal.

And LED drive circuit at each point of the clearance should be maintained at more than 7mm, EMI protection grounding capacitance and driving circuit of insulation strength, should be reinforced insulation (4V+2750V) and so can the LED drive circuit has good resistance to differential mode and common mode of lightning induction.

Qianshenglight Co.,Ltd.

admin@qianshenglight.com

2016-5-10

7W GU10 MR16 AC220V 4000K spot lamp

Details:

Model： QS-COB7W-GU10 Power： 7w LED Type： COB Lumen： 560Lm Input Voltage： DC12V, AC100-240V Material： Aluminum+Glass Size： Φ50*82mm Base： MR16/GU10 Bean Angle： 30/40° CCT： 3000K/4000K/6000K CRI： ≧80Ra Warranty： 2 years Qianshenglight.com is a high quality LED lighting manufacturer and exporter in China, you can visit our website: www.qianshenglight.com to know more, any need, please contact with us at: sales@qianshenglight.com

How to choose LED strip lighting?

With the improvement of people's living environment requirements, to save power and long life LED strip lightswith known, become more and more families in the decoration of the new house the necessary choices, however, in the purchase of LED strip lights with time, You have to keep their eyes open, beware of traps and errors. Because the market is flooded with a lot of low-quality LED lights, but we can choose to go through the following methods:


1, see the solder.
A formal manufacturer with using SMT SMD technology, used in the production of solder paste and reflow process. Therefore, the LED strip lights with solder joint relatively smooth and not much amount of solder, solder joint is extended arc from FPC to LED at the electrode pad. The uniform version of the cottage LED strip lights with solder solder volume was a dot wrap welding feet, also will have varying degrees of tin tip appears, this is a typical phenomenon in the manual welding.

2, Looking FPC quality.
FPC points of Copper and copper rolling, Bonded Copper foil is projecting, and then look at the connection from the FPC pad see it. And rolled copper FPC is close and connected as a whole can be bent and will not appear pad off phenomenon. Bonded Copper pad will appear if bent too much off, maintenance temperature is too high will cause pad off.

3, See LED strip lights with the cleanliness of the surface.
If the LED lamp produced by SMT technology, the surface cleanliness is very good, can not see any impuritie and dirt. But if by hand welding process for the production of cottage version of LED lamp belt, the surface no matter how cleaning will residual traces of the cleaning of stains and, at the same time the surface of the FPC will have residual flux and tin slag.4, Look at packaging.
Regular LED strip lights will use anti-static packaging roll tray, usually 5 m or 10 m roll of a roll, and then out again with anti-static moisture-proof bag sealed. The cottage version of LED lights because of the cost savings, while the use of recycled roll tray, then there is no anti-static moisture-proof bags, look carefully roll tray can see the appearance of a label when clear traces and scratches.
5, Look at the label.
Regular LED strip lights with bags and roll above the disk will have a printed label instead of printing labels. The cottage version of the label is printed, as well as specifications and parameters are not unified.

Welcome you to choose LED strip lighting on: http://www.qianshenglight.com/e_products/LED--strip-light-6.html

Qianshenglight Team
Admin@qianshenglight.com

144W SMD Bridgelux 48mil 96pcs 2700K-6500K street light from qianshenglight.com

Model:	QS-LDB144W-1
Power:	144W
LED Type:	Bridgelux 45mil 96pcs
Lumious Flux :	12240LM
Size:	679*292*98mm
Input Voltage:	AC90-265V
Material:	Aluminum+Glass
Bean Angle:	90/120°
CCT:	3000K/4000K/6000K
CRI:	≧75Ra
IP Rating:	65
Warranty:	2 years Links:http://www.qianshenglight.com/e_productshow/?31-144W-SMD-Bridgelux-48mil-96pcs-2700K-6500K-street-light-31.htmlv

What is the basis for judging the failure of LED？

Similar to other electronic components, LED failure is defined as the time required for the device can not be completed within the specified function, that is, the loss of its function as a failure.



When LED failure analysis, it must be followed to carry out non-destructive, reversible and repeatable test, do a half-destructive, non-repeatable experiments, and finally the principle of destructive testing. Should use the appropriate analytical methods to maximize prevent analysis device (DUA) real failure factors, signs of loss or failure of the introduction of new factors, in order to obtain an objective analysis conclusions.

You can use a LED parameter or changes of several parameters as the failure criterion. For example, commonly led luminous strength and the initial value of the ratio of to do judgment, which is defined as: with the growth of such work time, when the luminous intensity IV down to its initial value is a percentage value is considered the LED failure. This percentage value can be 50% or 20%.

Obviously, the assessment of the failure level of a single LED is not significant, usually for a class of the same attributes of the object of the group of failure assessment to have practical significance. That is to say, from a LED group, the number of devices used in a certain period of time and the percentage of the total number of the entire population to evaluate more meaningful, which is to use the so-called failure rate to evaluate the level of device failure.

Best Regards.
sales@qianshenglight.com

http://www.qianshenglight.com/

Key technological breakthroughs in the development of LED(qianshenglight)

In the history of LED development can not be separated from the rapid progress of technology. Every time a breakthrough, the characteristics of LED have been greatly improved. What are the key technological breakthroughs in the development of LED, this paper will analyze the development of LED technology from LED to the present day.

In 1907, the phenomenon of electro luminescence was observed in SiC.

In 1954, the GaP single crystal was made and its properties were studied.

In 1955, observed GaP luminescence phenomenon

In 1962, the observed GaAs PN junction phenomenon

In 1962, the development of GaAs infrared (870-980nm) LED, LD (wavelength of 650nm, is now widely used in laser pen, DVD machine);

In 1962, the development of GaAs system red LED;

In 1963, the development of GaP system red LED;

In 1965, GaP was introduced into the N and other electron luminescence centers.

In 1966, the external quantum efficiency of GaAs infrared LED was 6%;

n 1967, the external quantum efficiency of ZnO GaP: infrared LED was 2%

In 1969, the electro optic conversion efficiency of SiC blue LED was 0.005%

In 1969, the external quantum efficiency of GaP red LED was 7.2%

In 1972, the external quantum efficiency of the GaAsP system was developed by LED, which was 0.2%.

In 1972, the external quantum efficiency of ZnO GaP: red LED was 15%

In 1977, the external quantum efficiency of GaAsP red LED was 0.1%

In 1981, confirm the blue luminescence of GaN system.

In 1985, the development of four yuan crystalline AlGaInP orange LED

In 1986, the development of AIN system GaN low temperature accumulation buffer layer technology

In 1992, the external quantum efficiency of the GaN system of the blue PN homogeneous junction two tube was up to 1%

In 1994, GaInN/AiGaN heterojunction PN junction type high brightness blue LED (1CD)

In 1995, the external quantum efficiency of GaInN double heterojunction blue LED was up to 10%

In 1995, the development of the GaInN system of green LED

1997, developed the use of fluorescent powder white LED, light efficiency of 51m/W

In 2001, A1GaInP series: the processing technology that attached on the transparent substrate

In 2002, the performance of white LED was improved by the use of blue light and yellow phosphor, and the light efficiency was 62lm/W

In 2004, the performance of white LED was improved by the use of blue light and yellow phosphor, and the light efficiency was 80lm/W

In 2009, the research and development of multi surface emitting LED light bulbs, to achieve 360 degree full range of lighting.

For more info,please visit our website: www.qianshenglight.com

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