作者：Blade

Toyota synthesis productivity goal is to reach 7.5 billion of LED gu10 high power

Jointly designed by the Chinese Academy of Advanced Manufacturing and ASM, costing20 million yuan LED automatic assembly line will be located in the IMC photoelectric, this initiative shows that the LED automation era has come early. The IMC photo electric MCOB package, LED high bay lamps since listing on the market has been highly concerned about the development after the success of last year to 4000-5000 daily output can not meet the market demand,  LED gu10 high power, faced with huge production capacity of vacancies and recruit employees pressure, the IMC the optoelectronic had the introduction of automated production lines. High light efficiency, long life, low cost are the three requirements of the contract energy management products, and the current the IMC photoelectric production of LED lamps just to meet the three conditions, therefore,  LED gu10 high power, market resources, IMC first Sui prospective the EMC and engineering company to the whole light of 105-115LM / W technical specifications, in one fell swoop occupied market opportunities, domestic EMC’s identity; in foreign markets, due to the accumulation of more than six months, the monthly shipments of stability, LED gu10 high power, coupled with IMC the photoelectric international supply chain financing platform to build part of a major support area is also beginning to capacity pressures increasingly emergent. Fluorescent strips to better meet market demand, IMC photoelectric program from 5000 to / from short-term elevated to 50,000 / day, from the  LED gu10 high power, package assembly to fully automated production, the end of the whole lamp135LM / W lights industry, LED gu10 high power,which significantly improves the domestic market share.

Common faults for led solar street lighting system

 

Common faults for led solar street lighting system

 

The first case for the instrument panel of the led solar street lighting system is lit, there are two possibilities, an insufficient amount of oil the engine cannot be the complete lubrication of oil, under normal circumstances, the oil does not consume a lot of, so there may be leakage of engine oil. The second oil pump pressure and you should as soon as possible to stop to avoid traffic continue to operate without oil lubrication conditions resulting in engine damage.

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The second scenario is the dashboard of water level lights, due to the water tank is not no reason to reduce cooling system problem occurs, there are two possibilities, first, somewhere in the system water leakage, and second, the temperature is too high The led solar street lighting system pressure water squeezed out. If the tank leaks can be temporarily to the vice water tank, add water, and then try to open a nearby repair shop technician handling. The location of the vehicle with various sub tank is not the same, it is recommended that the owners should refer to the owner’s manual. Keep in mind is that due to high engine temperature, do not easily open the radiator cap in order to avoid the instant the smoke vapor damage.

 

If the water temperature of led high bay lights Quefei above, the heat with the cooling fan must immediately stop driving, or the temperature suddenly rose, and pressure change stool causes the coolant into a high-pressure steam from leaking out, and also led to the engine cylinder head deformation or cylinder head gasket is damaged, the vehicles that would take 1-2 days to repair.

 

LED street lights occupy 20% of total lighting export

 

LED street lights occupy 20% of total lighting export

 

Last year, the lighting of the city’s export value of about $ 1.345 billion, essentially flat year on year, but energy-saving light export volume has soared to become one of the highlights of the lighting exports. It is reported that nearly 85% of the lighting business in the city has set out to develop the design of the T8 LED street lights source or led high bay lights, and with the LED to achieve the upgrading of product structure.

 

As one of the main export commodities in the city’s lighting products last year exports rose flat, but the energy-saving light source has soared to become one of the highlights of the lighting exports. Inspection and Quarantine Bureau research for T8 LED street lights, close to 85% of the lighting companies have set out to develop the design of the LED light source or lighting, with the help of the LED to achieve the upgrading of product structure.

 

According to statistics, the city in 2011 exports of lighting products inspection value of approximately $ 1.345 billion, a decline of 0.2 percent compared to last year’s annual export of 2011 LED lights 1232 batch, the value of $ 40,120,000, an increase of 25.4 4470 batch% annual export of energy-saving lamps, a value of about $ 268 million, two types of energy-saving products export value accounted for 19.9% ​​of the lighting of total exports, compared to last year grew 3.5 percent share. From the current regulatory situation.

 

Annual exports in 2011 after the transformation of the Huayi Lighting LED lamps 113.2 million U.S. dollars, an increase of 335.4%, and quality products successful T8 LED street lights into the Macau hotel renovation works.

Dimmable led street light is no longer a myth

 

Dimmable led street light is no longer a myth

 

Ever since mankind realized must do everything possible to energy conservation, in order to solve the pressing problems of atmospheric warming, how to reduce electricity for lighting as an important issue on the agenda. Because 20% of the total energy consumption of electricity for lighting. Fortunately, energy efficient dimmable led street light, the LED itself than more than five times that of incandescent lamp, energy-saving fluorescent lamps, energy-saving lamps also about twice, unlike fluorescent lamps, energy saving lamps as mercury. If you can take advantage of dimming to energy conservation, it is also very important means of energy-saving. But in the past all the light sources are not easy to achieve dimming and easy dimming is a great advantage of the dimmable led street light.

 

Because on many occasions, in fact, do not need to turn on the lights or at least not so bright, but very bright light, such as midnight to dawn hours of street lights; subway cars from the ground to open the car to the outskirts of the ground lights; more common in a sunny office near the window, schools, factories, such as fluorescent lamps are also opened there. These places every day do not know a waste of electricity! The past because of the high-pressure sodium lamps, fluorescent lamps, ceiling lamps, energy saving lamps cannot dimming, only to forget it. To switch to led high bay, you can freely adjust light, electrical energy can be saved! So for lamp dimming, the dimming is not the main applications of the family wall, the market is also very small. But demand dimming of street lights, offices, shopping malls, schools, factories, it is more important occasions, not only a huge market, and considerable energy saving. These occasions do not need manual dimming, but auto-dimming, intelligent light!

The future development for high efficiency led lighting

 

The future development for high efficiency led lighting

 

Have already said that the best LED dimming is a simple PWM generator PWM dimming using the PWM dimming can be installed in the wall switch, and then use a potentiometer to control the PWM dimming ratio in order to achieve. To bright light switch off, then you need to add a pair of lines. It is not compatible with the original wall of the high efficiency led lighting switch leads. The lead of the led high bay lighting technology switch is only 2, you can while dimming can switch. This advantage is difficult to be compatible. But actually, truly the most commonly used dimming lamps table lamp or floor lamp dimmer switch are installed on the power cord is not a wall, that just do not care to take advantage of the wall of the two leads. In other words, the tone of the PWM alone can be directly applied to Dimmable high efficiency led lighting.

 

Taiwan has a company launched four sections called the EZ-Dimming GM6182 switch tone light of high efficiency led lighting would be a good program. Only the use of ordinary light switch on the wall will be able to achieve the dimming, the first time open for all light, the second on 60% brightness, third on 40% brightness, the fourth open for 20% brightness. The advantage of this system can use an ordinary wall switch dimming. And the power factor more than 0.92. Did not produce interfering signals into account. The disadvantage cannot be continuous dimming. There are operational high efficiency led lighting problems.

The disadvantages of high intensity led lamp used in the house

 

The disadvantages of high intensity led lamp used in the house

 

1) high intensity led lamp is more than half a century old technology, it has many shortcomings explained above, is a long overdue elimination technology. It should be and incandescent lamps, halogen lamps and stage of history.

 

2) many of these chips claim has the PFC can improve the power factor, in fact, it only improves the load power factor as the high intensity led lamp, to make them look close to the pure resistance of incandescent and halogen lamps, and has not improved, including the power factor of the entire system, including the led high bay.

 

4) all of the LED dimming system are also to adjust the LED forward current, the existence of the previously described chromatographic offset shortcomings.

 

5) the installation of high intensity led lamp proportion of less than one ten thousandth, while the proportion of thyristor switches installed in the wall even one ten thousandth of the SCR dimming lamps not because the vast majority of the installation of SCR dimming are table lamps, bedside lamps, floor lamp. Moreover, There are dozens of different specifications of the SCR and transistor tone light switch, in fact the development of IC is impossible to compatible with all of the thyristor switch, but only compatible with a small part of.

 

6) high intensity led lamp is a new Genesis technology, it has incomparable superiority. There is no need to sacrifice the advantages of the LED in order to take care of the backward of other LED lighting products. Should not go to the wall of the newly installed SCR switch to LED dimming.

RGB dimmable LED down lights using SCR

 

RGB dimmable LED down lights using SCR

 

Ordinary incandescent and halogen lamps commonly used SCR to dimmer. Led high bay lights and RGB dimmable LED down lights is a pure resistance device, it does not require the input voltage sine wave, because the current waveform is always the same voltage waveform, so regardless of how the voltage waveform deviate from the sine wave, as long as the change of the valid values ​​of the input voltage, can be dimming. SCR of the AC sine wave to be cut to achieve change its valid values ​​for the purpose. Load and thyristor switch in series.

 

Change the variable resistor divider ratio can change the conduction angle, in order to achieve the purpose of change of RGB dimmable LED down lights valid values​​. Usually the potentiometer with a switch connected to the input of n for the light switch. In addition to the SCR, there are transistors along the dimming technology, because their basic problem is the same, not in this introduces.

 

SCR dimming the shortcomings and problems

However, SCR dimming range of issues.

1) SCR destruction of the sinusoidal waveforms, thereby reducing the power factor value, usually the PF is less than 0.5, and the conduction angle is smaller the worse the power factor (1/4 brightness only 0.25).

2) Similarly, the non-sinusoidal waveforms to increase the harmonic coefficients.

3) non-sinusoidal waveform line to cause serious interference signal (EMI)

 

Also produce unexpected problems, in the ordinary thyristor dimmer circuit output to the LED drive power for RGB dimmable LED down lights is input LC filter causes SCR oscillation, this oscillation is insignificant for the incandescent because the thermal inertia of the incandescent lamp makes the human eye do not see this oscillation.

AC power supplied LED dimming technology

 

AC power supplied LED dimming technology

 

How to achieve the PWM dimming

Concrete realization of the PWM dimming method in series with a MOS switch is in the LED load, the anode of the LED dimming technology with a constant current power supply.

Then added to the gate of the MOS transistor with a PWM signal to quickly switch the led high bay in order to achieve dimming. Also a lot of constant current chip itself with a PWM led high bay interface, you can directly receive the PWM signal, and then output to control the MOS switch. PWM dimming method are the advantages and disadvantages?

 

Eliminate the dimming caused by whistling: 200Hz or above the human eye cannot detect, but until 20kHz are human auditory range. At this time it is possible to hear the slightest sound. To solve this problem there are two ways, Firstly, increasing the switching frequency above 20kHz, out of the human auditory range. However, the frequency of LED dimming technology is too high can also cause some problems, because the impact of various parasitic causes the pulse waveform distortion (along the front and rear).This reduces the accuracy of dimming. Another method is to identify the sound device to be addressed. In fact, the main sound device output ceramic capacitors, ceramic capacitors are usually made ​​of high dielectric constant ceramic, these ceramics have piezoelectric properties. 200Hz pulse will produce a mechanical vibration and sound. The solution is the use of tantalum capacitors instead. However, the high voltage tantalum capacitors is difficult to obtain, but the price is very expensive, will increase the cost of LED dimming technology.

Change the brightness of the high intensity uv led

 

Change the brightness of the high intensity uv led

 

To work long hours at low brightness may make the step-down constant current source efficiency to reduce the temperature rise increased unable to work. Most people may think that just down to reduce the output power of constant-current source, so it can not cause the power consumption of high intensity uv led of the step-down constant current source to increase the temperature rise increased. Little do they know when the forward voltage drop caused by the lower forward current make buck than the lower. The efficiency of the step-down constant current source and high intensity uv led, buck ratio, the lower the efficiency the greater the wear and tear on the chip’s power consumption.

 

Adjust the forward current cannot be precise dimming. Because the forward current and light output is not completely proportional relationship between the different high intensity uv leds have different forward current and light output curve. So adjust the forward current is difficult to achieve precise light output control.

 

The led high bay is a diode, it can achieve fast switching. The switching speed can be up to the microsecond above. Is unmatched by any light-emitting devices. Therefore, as long as the power source into a pulsed constant current source, the method of changing the pulse width can change its brightness. This method is called pulse width modulation (PWM) dimming method. If the pulse cycle tpwm, pulse width of the ton, the D (or called porosity) ton / tpwm. Work to change the pulse of constant current source can change the brightness of the high intensity uv led.

Problems suffer for high lumen led flashlights used in daily life

 

Problems suffer for high lumen led flashlights used in daily life

 

In the specific implementation, however, adjust the forward current dimming may produce a more serious problem.

 

We know that the c is usually driven DC-DC constant current drive power, and such constant current drive source is usually divided into two kinds of step-up or step-down (of course, the buck, but because of low efficiency, The prices are not commonly used). LED forward voltage is determined by its forward current. We can see from the volt-ampere characteristic of the LED forward current changes will cause the corresponding changes of the forward voltage, or more precisely, the decrease of the forward current can also cause the forward voltage decreases. Therefore, to reduce the current, led high bay light forward voltage will follow reduced. This will change the relationship between supply voltage and load voltage.

 

For example, an input of 24V LED lamps, 8 1W high power LED series. For a boost type constant current source must work at the buck does not work, the last high lumen led flashlights will flicker. In fact, as long as the boost type constant current source, adjust the forward current dimming transferred to the low brightness almost certainly will produce flicker. Time of the LED load voltage must be lower than the supply voltage. Many people do not understand one of the problems, but also the total going to the dimming circuit to find the problem, it is futile.

 

Step-down constant current source of as if originally the supply voltage is higher than the load voltage when the brightness is to low-key, the load voltage is reduced, they still need to step-down constant current source.