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1.Introduction
   The controller and LED driver are the least expensive, but the most important segments in the whole solar streetlight system. It is particularly important to choose intelligent type controller and driver for the system, since they can not only reduce the procurement cost of solar panels and batteries as well as the after-sale workload, but also enhance the competitive advantage in bidding. 
   Considering the frequent under-voltage of streetlights due to poor sunshine in winter which is the most common problem in current solar streetlight application, Evada has developed an intelligent integrated constant-current controller. This controller can automatically check the capacity ratio of battery, and when the battery capacity is low, will automatically output current in proportion to the deficiency of battery capacity so as to increase the lightup days of solar streetlight. Through near two-year practical engineering application of specific customers, it has been proved that with normal configuration, power failure of solar streetlight seldom happens thanks to this controller. It is really a boon for solar streetlight users.
2.Features
I. Integrated structure: as an accessory device specially for LED solar streetlight, the product integrates a mature solar controller and a mature boost LED driver, which can reduce the points of failure, simplify the onsite installation and construction processes and greatly cut down the system cost. 
II. Equipped with cutting-edge, powerful 32-bit DSP digital signal processor from Texas Instruments (TI).
III. Maximum power point tracking (MPPT): according to different luminous efficiencies, the controller can detect in a real-time manner the changes in voltage and current of solar panel and track the maximum voltage and current values (VI), so that the system will charge the battery at the highest efficiency to maximize the solar energy utilization. 
Note: compared to the traditional PWM charger, the electricity generation of MPPT charger will be 10% ~ 45% more, depending on the operating temperature of solar panel. The lower the operating temperature of solar panel, the bigger difference in electricity generation between MPPT charger and PWM charger. For example, when the solar panel works under 25℃, the electricity generation of MPPT charger will be about 28% more than that of the PWM charger; and when the solar panel works under -40℃, the electricity generation of MPPT charger will be about 45% more than that of PWM charger.
IV. Derating based on capacity: the controller is provided with the ground-breaking function of automatic output current reduction based on battery capacity. For example, in a LED lighting system (50W) consisting of 10 lamps in series and 5 lamps in parallel with a total output current of 1650mA, the system output current is normally 1650mA, when it’s detected that the battery capacity has fallen below 70%, the controller will gradually reduce the discharge current to a minimum level of about 30 %, and after the battery is fully charged will automatically restore the current to the normal level.
Note: with regard to the configuration design of solar streetlight, in many cases, for the purpose of keeping the overall system cost as low as possible, the designed power of solar panel could not meet the usage requirements in winter, and the designed capacity of battery usually lasts for 3 to 5 days in case of continual rainy or snowy days. However, in most parts of China in winter, it features very low total solar radiation, longer nights and often over 10-day continual rain or snow, resulting in that most solar streetlights can not stand the test of winter or even fail to work steadily constantly except in summer. However, this controller is able to solve this problem effectively without adding any solar panel or battery. 
V. Wide-range voltage output: the driver in this integrated controller adopt wide-range voltage output design for different applications of LED lamps. For a 12V system, the output voltage is adaptive within a range from 15V to 60V, equivalent to the circuits of 5 - 17 lamps (1W) in series. For a 24V system, the output voltage is adaptive within a range from 30V to 60V, equivalent to the circuits of 10 – 17 lamps (1W) in series. This feature breaks the voltage limitation of traditional constant-current power supply and meets various voltage, power and current requirements of LED lamps. 
VI. 3-period wide-range adjustable current output: Another important advantage of this integrated controller is from its 3-period setting and wide current setting range for the 3 periods. The discharge time at night can be divided arbitrarily into 3 periods, of which, the duration can be set from 10 min to 999 min and the output current can be set from 150mA to 4000mA. Besides, it’s able to reduce the output current of LED lamps during the 2nd period in midnight or switch them off in any period. This controller is well received by many customers, since it is energy-efficient and flexible while saving investment in additional solar panels and batteries. 
VII. High conversion efficiency: the conversion efficiency is one of the important factors determining the quality of driver. A driver of low conversion efficiency means high loss, high heat and short electrolytic capacitor life; what’s more, it implies that the designed capacity of solar panel and battery shall be increased. With this integrated controller, the conversion efficiency for constant-current power supply could be as high as 94%, much higher than that of ordinary constant-current power supply which is only about 85%.
VIII. Complete waterproof protection: some customers find that the circuit board of non-waterproof controller may become corroded or rusted after a year or so, and in a environment with high humidity or salinity, or a high likelihood of water seepage or overflow, the controller is easier to corrode or damage, which increases the after-sale work load of contractor and sometimes even leads to customer outflow. The integrated constant-current control is designed with fully sealed waterproof structure. Users don’t have to worry about the influence of air moisture, salt mist, water seepage through light pole or impounded surface water in the working environment, or any malfunction, short circuit or burnout of controller due to any invading water. Thanks to its above IP67 design, the controller can work properly for long time even when being put into water, greatly improving the stability and reliability. 
IX. Excellent heat dissipation: Sound heat dissipation is essential to the efficient and sustained functioning of both controller and driver in the LED system. For cost reasons, some controllers are provided with plastic enclosure or iron bottom plate, which can not meet the continuous heat dissipation requirements, especially in the high temperature areas, poor heat dissipation effects will lead to reduced efficiency and accelerated aging of the field effect transistors in the controller resulting in system disorder or damage. Moreover, the short board in the service life of constant-current power supply lies in electrolytic capacitor which requires extremely high heat dissipation effects. With full aluminum enclosure and multi-edge bottom plate, this integrated constant-current controller features a larger heat radiation area and permanent optimal heat dissipation results, which together with its high efficiency and low heat generation ensure long life expectancy of the product. 
X. Wide temperature range: In addition to imported field effect transistor, single-chip microcomputer and metalized polyester capacitor, this integrated controller is equipped with high quality parts to guarantee high stability. Besides, Evada has an imported SMT production line, powerful comprehensive laboratories and complete aging equipment, and carries out the ISO9001 Quality Management System and strict quality assurance in production, test and other processes. Experiments show that the product is stable in the performance test (-45℃~70℃) in the high and low temperature experimental oven, which guarantees that it can work stably for long time in a wide temperature range of -40℃~60℃.
XI. Intelligent protection for temperature rise: thanks to its high-quality heat radiating components and high efficiency, this controller in general has a relatively lower temperature rise. However, if overheat is detected, the intelligent protection for temperature rise will be activated to protect LED lamps since they are more likely to damage under ultra-high temperature. When it’s detected that the temperature inside is over 70℃, the controller will regard it as overheat and reduce the output current of LED lamps, if the situation continues, it continues to reduce the current up to 45%. When it’s detected that the temperature inside is over 85℃, the controller will regard it as exceptional overheat, cut off output and automatically resume the next day.
XII. Temperature compensation for battery: due to the negative temperature characteristic of battery, at room temperature (25℃), for a 12V battery the voltage will be reduced by 0.014-0.018V for every 1℃ increase in ambient temperature. This controller will automatically provide voltage compensation to prolong the battery life, thus, resolve the charge difficulties of battery, i.e., undercharge under low temperature and overcharge under high temperature.
XIII. Trickle current protection: during charging, after the battery voltage is at its peak, if HV charging continues, it may lead to water loss or loss of control of the battery, however, if charging is s ped, the battery can not be fully charged. To solve this problem, this controller after the peak voltage will immediately step down to 1V and then go into the trickle charging mode. In this way, the battery can be fully charged and be protected from water loss or loss of control. Similar to cycle charging, this function can offer effective protection to the battery while  increasing its recharge cycles and extending its life. 
XIV. Wireless computer connection: in combination with the infrared programmable remote control from Evada, this integrated controller can enable multiple operating modes and setting of protective voltage, light illumination and other parameters. With the help of necessary software supplied by Evada, it’s able to query the data about solar panel, battery voltage and times of under-voltage in the controller, and set other working parameters of the controller (please refer to the software operation instruction for details).
XV. Settable activation/deactivation of under-voltage protection: in a conventional controller, the voltage settings of activation and deactivation of under-voltage protection are . But in practical use, the under-voltage setting point varies depending on the battery type, for example, low-power load discharge requires a high setting point of under-voltage, yet high-power load discharge requires a low setting point of under-voltage. With regard to this integrated controller, the voltage settings of activation and deactivation of under-voltage protection, and the light illumination are settable, featuring high convenience. 
XVI. Without electrolytic capacitor: compared to the traditional design with electrolytic capacitor, this controller has a longer designed life (as long as 25 years) and more stable and reliable performance. 
In addition to the above functions, this integrated controller is provided with:
A full range of protection such as reliable lightning protection; protection against reverse polarity of battery; protection against reverse discharge at night; protection for open circuit, short circuit, over-current, over-voltage and overpower at output end, to safeguard the long-term stable operation of the whole system. 

Please contact Evada for detailed technical parameters. The above information is for reference only, please subject to the actual product.


 
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