At present, most lawn use LED as a light source, LED, long life, can reach more than 100000h, low voltage, very suitable for application in solar lawn light on. In particular, LED technology has experienced a breakthrough in the key, and its properties in the past 5 years has greatly improved its cost performance has greatly improved. In addition, LED by the low voltage DC power supply, its low cost and light control, so adjust the light and shade, frequent switches are possible, and will not adversely affect the performance of LED. You can also easily control the color, change the distribution of light, resulting in dynamic mirage, so it is particularly applicable in the solar lawn light on. But the LED has its many inherent features, when used will result in negative consequences if not pay attention. LED light is currently on the market efficiency can only reach 15 lm W, can only achieve three-color color Energy efficient 1 3, three-color phosphor luminous efficiency energy efficient lamps can reach 50-60 lm W, from the price , the current production costs per 1m: three-color color energy efficient lamps (with electronic ballasts) 0.022 yuan, in 2002 φ5mm price of 1.9-3.0 million white LED, the current production cost price per 1m very different. From the life point of view, three-color color energy efficient lamps (with electronic ballasts) can achieve the life of 6000h, LED can reach more than 100000h, the surface is a three-color color LED service life of high energy-saving lamps (with electronic ballast ) a few times, but it is not. Most of the current solar lawn light ultra bright white LED, it is under the super bright white LED 20mA lumen maintenance rate of the initial strength of 50% of the time (life) less than 10000h, Fudan University has proved the point light source . This means that, at present, in many cases not the best solar LED lawn light, unless it is a low service life of only 1-2 years, solar lawn light, or less than 1W solar lawn. Solar lawn light for more than 1W, the best use of energy efficient tri-color light color. There are a number of solar lawn lamp ultra bright white light with only 30-40 LED, input power of 2W or more, in this case a three-color color if the energy efficient lamps, the price is only LED’s 1 10, 4 times the original flux , The good news is now successfully developed a low-voltage DC-2-10W Energy efficient three-color color, life can be achieved 6000h.
According to the above analysis, we believe that the following low-power 1W solar lawn light, shading the adjustment, frequent switching function, the general should use LED as light sources. However, when using super bright white LED lumen maintenance with particular attention to the problem, otherwise easily lead to mass accidents. For the power of the larger solar lawn light, three-color color currently in use is reasonable and efficient energy-saving lamps. It should be emphasized that the above conclusion is only the present analysis, when the LED technology to improve after the price drop, the above conclusions need to be adjusted.
Boost circuit efficiency
Low-power solar lawn generally boost circuit, the current oscillation circuit by the manufacturer, inductor boost. Inductor inductor using standard color code, the standard color code used in open circuit inductor, a large loss of flux, so the circuit efficiency is low. If the boost inductor with closed magnetic circuit manufacturing, such as ring, boost circuit efficiency will be greatly improved. We have manufactured using φ10 ring inductance, the control experiment under the same conditions, compared to the sample are a factory in Ningbo, Zhejiang and Jiangsu Zhenjiang, a small power plant solar lawn lamp, manufactured by closed circuit inductance than the standard color code inductor efficiency by 20% to 40%.
(1) LED diode features close to the regulator, the working voltage 0.1V, operating current of approximately 20mA may change. For security, the general circumstances under which the current limiting resistor in series, a great energy loss is obviously not suitable for solar lawn light, and LED brightness with voltage changes. Boost circuit is a good way, can also use a simple constant current circuit, in short, must automatically limit, otherwise it will damage the LED.
(2) General LED peak current 50-100mA, anti-reverse-battery or battery-load high-energy, high peak voltage when the boost circuit is likely to exceed this limit, damage to the LED.
(3) LED is not good temperature characteristics, temperature rise 5 ℃, flux decline of 3%, use in summer to note.
(4) discrete voltage is high, the same model, same batch of LED operating voltage has some differences, not parallel. Must be parallel, both streams should be considered.
(5) Super bright white LED color temperature for the 6400L-3000K, the current low color temperature of the super bright white LED is still not entered the market, so the manufacture of ultra-bright white LED solar lawn light penetration is rather poor, where the optical design to note.
(6) super bright white LED electrostatic effect on the great need in the installation, anti-static facilities, workers should wear anti-static wrist band, subject to static electricity damage was super bright white LED can not tell by eye, but using life will be shorter.
Battery charge and discharge control and temperature compensation
Since the input of solar energy photovoltaic power generation system unstable, solar photovoltaic system on the battery charge and discharge control than the average battery charge and discharge control complex. Solar Lawn charge and discharge control circuit will determine the success of the product is successful, a proper control circuit should have the following functions: to prevent anti-charging function to prevent over charging to prevent battery over-discharge, lead-acid battery temperature compensation. For solar lawn, if you use Ni-Cd batteries, do not prevent the battery from over discharge function, if the solar battery power relatively small, he can not consider against over-charging. This is the current number of solar lawn use Ni-Cd battery reasons. However, if the battery is necessary to consider use of other features above.
(1) to prevent anti-charging function. Generally speaking circuit in the solar cell is a diode in series, diode to prevent reverse charging, the diode should be a Schottky diode, Schottky diode diode drop lower than normal.
(2) to prevent over charging. You can enter the circuit in series or in parallel with a discharge transistor, the voltage differential transistor switching circuit control, more solar energy than the discharge through the transistor, to ensure that no high voltage to charge the battery. The key is to prevent over charging pressure of selection, a single lead-acid battery is 2.2V.
(3) In addition to Ni-Cd batteries, other batteries generally need to prevent the battery from over discharge function, because the battery over-discharge may cause permanent damage. Note that solar systems are generally small relative to the battery discharge rate, so the discharge cutoff voltage should not be too low.
(4) temperature compensation, battery voltage control described above is that as the ambient temperature changes, so should have a solar lawn lamp system controlled by the temperature reference voltage. For a single lead-acid battery is -3 ~-7mV ℃, we usually use-4mV ℃
Tips of choose LED lamp for Solar Lawn Light
Posted by admin in News
At present, most lawn use LED as a light source, LED, long life, can reach more than 100000h, low voltage, very suitable for application in solar lawn light on. In particular, LED technology has experienced a breakthrough in the key, and its properties in the past 5 years has greatly improved its cost performance has greatly improved. In addition, LED by the low voltage DC power supply, its low cost and light control, so adjust the light and shade, frequent switches are possible, and will not adversely affect the performance of LED. You can also easily control the color, change the distribution of light, resulting in dynamic mirage, so it is particularly applicable in the solar lawn light on. But the LED has its many inherent features, when used will result in negative consequences if not pay attention. LED light is currently on the market efficiency can only reach 15 lm W, can only achieve three-color color Energy efficient 1 3, three-color phosphor luminous efficiency energy efficient lamps can reach 50-60 lm W, from the price , the current production costs per 1m: three-color color energy efficient lamps (with electronic ballasts) 0.022 yuan, in 2002 φ5mm price of 1.9-3.0 million white LED, the current production cost price per 1m very different. From the life point of view, three-color color energy efficient lamps (with electronic ballasts) can achieve the life of 6000h, LED can reach more than 100000h, the surface is a three-color color LED service life of high energy-saving lamps (with electronic ballast ) a few times, but it is not. Most of the current solar lawn light ultra bright white LED, it is under the super bright white LED 20mA lumen maintenance rate of the initial strength of 50% of the time (life) less than 10000h, Fudan University has proved the point light source . This means that, at present, in many cases not the best solar LED lawn light, unless it is a low service life of only 1-2 years, solar lawn light, or less than 1W solar lawn. Solar lawn light for more than 1W, the best use of energy efficient tri-color light color. There are a number of solar lawn lamp ultra bright white light with only 30-40 LED, input power of 2W or more, in this case a three-color color if the energy efficient lamps, the price is only LED’s 1 10, 4 times the original flux , The good news is now successfully developed a low-voltage DC-2-10W Energy efficient three-color color, life can be achieved 6000h.
According to the above analysis, we believe that the following low-power 1W solar lawn light, shading the adjustment, frequent switching function, the general should use LED as light sources. However, when using super bright white LED lumen maintenance with particular attention to the problem, otherwise easily lead to mass accidents. For the power of the larger solar lawn light, three-color color currently in use is reasonable and efficient energy-saving lamps. It should be emphasized that the above conclusion is only the present analysis, when the LED technology to improve after the price drop, the above conclusions need to be adjusted.
Boost circuit efficiency
Low-power solar lawn generally boost circuit, the current oscillation circuit by the manufacturer, inductor boost. Inductor inductor using standard color code, the standard color code used in open circuit inductor, a large loss of flux, so the circuit efficiency is low. If the boost inductor with closed magnetic circuit manufacturing, such as ring, boost circuit efficiency will be greatly improved. We have manufactured using φ10 ring inductance, the control experiment under the same conditions, compared to the sample are a factory in Ningbo, Zhejiang and Jiangsu Zhenjiang, a small power plant solar lawn lamp, manufactured by closed circuit inductance than the standard color code inductor efficiency by 20% to 40%.
(1) LED diode features close to the regulator, the working voltage 0.1V, operating current of approximately 20mA may change. For security, the general circumstances under which the current limiting resistor in series, a great energy loss is obviously not suitable for solar lawn light, and LED brightness with voltage changes. Boost circuit is a good way, can also use a simple constant current circuit, in short, must automatically limit, otherwise it will damage the LED.
(2) General LED peak current 50-100mA, anti-reverse-battery or battery-load high-energy, high peak voltage when the boost circuit is likely to exceed this limit, damage to the LED.
(3) LED is not good temperature characteristics, temperature rise 5 ℃, flux decline of 3%, use in summer to note.
(4) discrete voltage is high, the same model, same batch of LED operating voltage has some differences, not parallel. Must be parallel, both streams should be considered.
(5) Super bright white LED color temperature for the 6400L-3000K, the current low color temperature of the super bright white LED is still not entered the market, so the manufacture of ultra-bright white LED solar lawn light penetration is rather poor, where the optical design to note.
(6) super bright white LED electrostatic effect on the great need in the installation, anti-static facilities, workers should wear anti-static wrist band, subject to static electricity damage was super bright white LED can not tell by eye, but using life will be shorter.
Battery charge and discharge control and temperature compensation
Since the input of solar energy photovoltaic power generation system unstable, solar photovoltaic system on the battery charge and discharge control than the average battery charge and discharge control complex. Solar Lawn charge and discharge control circuit will determine the success of the product is successful, a proper control circuit should have the following functions: to prevent anti-charging function to prevent over charging to prevent battery over-discharge, lead-acid battery temperature compensation. For solar lawn, if you use Ni-Cd batteries, do not prevent the battery from over discharge function, if the solar battery power relatively small, he can not consider against over-charging. This is the current number of solar lawn use Ni-Cd battery reasons. However, if the battery is necessary to consider use of other features above.
(1) to prevent anti-charging function. Generally speaking circuit in the solar cell is a diode in series, diode to prevent reverse charging, the diode should be a Schottky diode, Schottky diode diode drop lower than normal.
(2) to prevent over charging. You can enter the circuit in series or in parallel with a discharge transistor, the voltage differential transistor switching circuit control, more solar energy than the discharge through the transistor, to ensure that no high voltage to charge the battery. The key is to prevent over charging pressure of selection, a single lead-acid battery is 2.2V.
(3) In addition to Ni-Cd batteries, other batteries generally need to prevent the battery from over discharge function, because the battery over-discharge may cause permanent damage. Note that solar systems are generally small relative to the battery discharge rate, so the discharge cutoff voltage should not be too low.
(4) temperature compensation, battery voltage control described above is that as the ambient temperature changes, so should have a solar lawn lamp system controlled by the temperature reference voltage. For a single lead-acid battery is -3 ~-7mV ℃, we usually use-4mV ℃