Tag Archives: solar led street lamps
solar street light operation mode control which high-brightness high-current LED lights,
the same intensity as in the case, saving about 90% compared with
incandescent, has been widely used, has been a gradual trend to replace conventional lighting.
solar street light controller in series by a number of LED lights, adjustable brightness via a PWM mode, the EN pin to change by the current flowing through
the LED to adjust the LED brightness, the current intensity can range from a few milliamps to 1 amp, eventually LED lights to achieve the desired brightness.
PWM signal generated by the microcontroller, but also by the other pulse signal, PWM signal allows the current through the LED light changes from 0 to rated
current, you can make the LED light from the dark into the normal brightness. The smaller the PWM duty cycle (high for a long time), the higher the
brightness. Use of PWM control of LED brightness, very convenient and flexible, is the most common dimming method, PWM frequency from tens Hz to
thousands Hz.
PWM dimming is achieved by controlling the MOSFET transistor.
As the solar street lamp unit controller system uses voltage is generated by several batteries in series, so the selection of MOSFET transistors, the first thing to
consider the MOSFET voltage, the system requires the MOSFET voltage is higher than 40V; Secondly, according to the driver LED lamp current size, choose
the maximum current of the MOSFET IDS. In the case of DC power supply, the first consideration is the maximum current value of IDS and RDS values. Under
normal circumstances, should be used in the MOSFET maximum current IDS drive current of the LED lights more than five times; Also choose the MOSFET
resistance is smaller; LED drive current increases, RDS should be smaller, RDS smaller, more efficient conversion high.
City Solar street light is closely related to people\\ s lives and public facilities, which to some extent reflects the city\\ s prosperity and development. For a long
period of time, lights are mostly confined to update some of its lighting, and electronic technology with the development of the city, the city street system
has undergone a manual control, automatic timer / photoelectric control, control computer program development process. Computer to achieve the city\\ s
automatic control system solar street light, for improving the city\\ s modern management level, save manpower, material resources, have a good economic and
social benefits. Through effective regulation of light switching time, can greatly improve the street system of work quality and efficiency of urban lighting
system for the operation, maintenance, expansion, providing comprehensive solutions and strong technical support to improve the operation of urban lighting
management level.
Interpretation of how to use high-pressure LED to improve the efficiency of LED bulbs
Use LED as light bulbs to replace the threaded screw-in incandescent bulbs has many advantages. In general, we will trumpet (5-9) of the LED in series, using a power supply to line voltage into low voltage (typically a few tens of volts), when the current is about 350 to 700mA. In determining how best to allow users with the line voltage isolation, we need careful consideration, on balance. We can achieve power in isolation, can also be installed in the LED process in such isolation. In some low-power design, LED physical isolation is a common approach, because it allows the use of lower cost non-isolated power supply.
Figure 1 shows a typical LED light alternative. The example of the power supply non-isolated power supply, the means to achieve user isolation voltage protection is embedded in the package rather than the power supply. Obviously, the power of the space is extremely small, and thus pose a challenge to the package. In addition, the power to be buried inside the package, thus preventing the heat, affecting the efficiency.
Figure 2 shows a 120-volt AC power through the LED-powered, non-isolated circuit. It contains a power for the buck power stage rectifier bridge. The buck regulator is an "upside-down version", the power switch Q2 in the circuit, while the circulation diode D3 is connected to power. The power switch conduction period, through a source resistance of the current regulation. Despite this very high efficiency (80% -90%), but there are several limitations of this circuit efficiency shortcomings. Turn the power switch must carry the full output current, while the power switch is off, the output current flows through the circulation diode. In addition, the current sense resistor R8 and R10 of the voltage of about 1 volt. 15 to 30 volts compared to the LED voltage drop across all three are great, and power efficiency will be a constraint. More importantly, these losses will promote bulb temperature. Ability of the LED light will gradually decrease, and this ability with the LED operating temperature are closely related. For example, 70oC conditions, LED light output by 30% of the time exceeded 50,000 hours, and in 80oC conditions, this time only 30,000 hours. As the bulbs are installed in some of the "tube" in which "tube" tend to impede the heat is not conducive to convection cooling, the heat problem is further complicated.
LED manufacturer LED series by the number of teams in a common substrate, to create a higher voltage of the light. The high pressure also brought light or have a lower cost or higher power supply efficiency. Using these high-pressure products, we only need to use a rectifier and a ballast resistor, in order to achieve more cost-effective power method. Although this power can produce very good power factor, but is inefficient because a large part of the input voltage are used in a steady flow resistor, resulting in 30% -50% of the LED power loss. However, it can be used for small volume, low-power applications. However, in some high-power applications, the low efficiency allowed to no avail. Figure 3 shows another alternative: the use of a boost power supply. Most of the circuit the same way as above. However, the switch, diode, and current detection loss is much smaller, bring up to 90% to 95% efficiency. In addition, the circuit also has a good power factor of 97%.
Figure 4 is described in Figure 1-2 Schematic diagram of the power of pictures. Even if the power output generated roughly the same, but there are some significant differences in size affect the power supply. Power boost inductor size was smaller, because of its lower storage requirements. Compared to the step-up power supply, power supply with a larger step-down resistor. The simulation of the load resistor as a resistor (Figure 2 R20), used to determine when to turn dimmer silicon controlled rectifier (SCR). Need to do this because of the dimmer switch in the Triac next to a component of electromagnetic interference (EMI) suppression capacitor, in the case of no-load power supply voltage is relatively higher. This will disrupt the power supply, leading to instability dimming. Shique not necessary to use the power boost, because the LED through the boost inductor connected to the input, to provide sufficient load, so the problem will not be a problem. Not shown in the back of the board, but as shown in the diagram, there are more low step-down power supply circuit. Therefore, the step-up power with lower power consumption, this LED bulb replacement, such as limited space applications is extremely important.
In short, because of its low power consumption, high-voltage LED, a small temperature rise characteristics, can help increase the spin-LED lamp life. It is through the use of alternative buck-boost power supply, thereby enhancing the power efficiency to achieve. Boost the power loss is about half the buck regulator. In addition, fewer components boost power, power factor better, smaller, and the use of a triac dimmer switch assembly is easier to achieve.
Ningbo Bright terminal 20 using high-power LED lighting energy-saving effect
Recently, the reporter came to light in operation near Ningbo port. At night, like a day here. It turned out the light in the terminal used by the dim light of Electronics Co., Ltd. Ningbo s LED High Pole, which is the nation s first to use high-power LED lighting pier. Although the lighting is only 400 watts of power, less than half of the other terminals lamp power, but was able to reach the ground brightness 20Lux (lux), about twice that of other terminals.
Optronic Devices Corporation was incorporated in June last year in Ningbo Free Trade Zone, the main use in the municipal road, port terminals, traffic tunnels, airports and other large-scale outdoor LED lighting.
Use bright lighting terminals, it is a special Central Optronic s white LED pole lamp, a total of a total of 120. Optronic Devices chairman Chuying Jun said the pier using the 1000-watt high pressure sodium lamps compared to 400 watt LED pole lamp, electricity can reduce the 396,800 yuan per year, maintenance costs can be reduced 283,800 yuan. Rough calculation, using as little as five years, 793.66 tons of coal, 539.69 tons reduced dust emissions 1978.19 tons of carbon dioxide, reducing the 59.52 tons of sulfur dioxide emissions.
Since the high pole lamp LED lighting, and energy saving, why not rate in the country s terminal high?
"Although there are many domestic LED light manufacturer, but can do large-scale outdoor LED lighting business but not much." Chuying Jun said, generally high power outdoor LED lights, heat capacity, but also consider the complex external environment, such as lightning, salt spray, dust, etc., which will affect the quality of light and life.
Electronics companies in the dim light was able to overcome these problems, because of its use of the Group s technological advantage. Ningbo is the parent company of electronics in the dim light of the dim light of Electronics Group in Shandong, 16 in America by American joint venture founded by Chinese, is the earliest development of LED lighting technology into one of the companies with R & D capability of chip and package , in Taiwan, Shandong Weifang and the U.S. Silicon Valley have research and development base and R & D team, is currently the global LED street lamp market, shipments of the largest suppliers.
Relying on the parent technical advantages, Ningbo, Zhejiang AMEC with the geographical conditions and lighting requirements, lighting requirements for port operations, design and development of the GN40 type LED pole lamp, pole, 30 meters high, an increase of mine-protected, using teardrop-shaped with a light way to optimize the effect of light irradiation distance.
Good results, but also attracted the attention of other customers. Terminals located in the Merchants Daxie, also introduced in the dim light provided by LED High Pole electronics. Currently, the project has entered the commissioning phase.
2 011, LED lamps will force home lighting
According to preliminary statistics, China s LED sales in 2010 will exceed 150 billion yuan output value, the data is twice that in 2008, and the rate of 30% per
year continues to grow. It is understood that only a province of Guangdong, is expected to scale of the industry in 2012 will reach 120 billion yuan. Following
the 2010 Copenhagen meeting our government made the policy and implementation of low-carbon economy, unswervingly after the launch of two of the
"Eleventh Five-Year" development plan the green light, making the LED semiconductor lighting industry, lighting industry quickly became a courtesan, lighting
Lighting companies have sniffed out energy subsidies, and market power. Since the emergence of white LED, luminous principle or whether it is functional and
so have other advantages unmatched by conventional light sources.gu10 led light bulbs
LED lighting has become the 21st century, a trend in the field of indoor lighting, LED has shown a trend to replace traditional incandescent and fluorescent
lamps, traditional lighting room has been facing severe challenges. By a light bulb to illuminate a room is a thing of the past. Now people pay more attention to
the details of the decoration room, bathroom mirror at the top of a small lamp, corridor wall paintings at the top of a spot light, can reflect the unique fashion
taste.
Many designers believe that the domestic interior lighting design from the past focus on only a single light source and gradually transition to the pursuit of
more lighting effects, this change has been realized that a good designer lighting design on people s lives impact. LED light source to promote the development
of innovative lighting design, lighting a large extent changed the concept, so that from the traditional point, line source limitations freed, visual and forms of
creative expression that has a more flexible space, room will be more energy-efficient lighting technology, health, art and human development. Meanwhile, the
lighting of the brand is top priority.solar power garden lights
Lighting exhibition in Frankfurt, Germany, the Netherlands Royal Philips Electronics demonstrated its lighting and mood lighting in general achieved in the area
of ??LED technology and innovative solutions, these series include home, office, service industry and other segments the market. "Philips" has become the first
to introduce LED home lighting, is the first systematic introduction of a full range of home lighting industry s international lighting manufacturers. In Guangya
Exhibition, Osram, GE, three male Aurora, really bright, Addison and other leading brands have launched experiential LED home lighting shop. Op lighting from the
development of a single LED "Meizu" ceiling transition to a new generation of LED home lighting products.led street lighting
In summary, it is easy to see LED as the primary light source luminous efficiency of home lighting experience will gradually become the mainstream product
brand development. If 2009 is LED home lighting, landing the "signs of Year" in 2010, is "trying year", then 2011 is likely to be "into years."