Method for promoting large power LED solar energy road lamp efficiency
A technology for solar street lamps and LED lamps, applied in the field of solar street lamps, can solve the problems of reducing the cost of lamps, not fully considering the matching of LEDs and batteries, not designing luminous efficiency, etc., so as to achieve the effect of improving the utilization rate of electric energy and improving the light efficiency.
Inactive Publication Date: 2007-11-28
JIANGSU WENRUN OPTOELECTRONICS
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Problems solved by technology
[0005] At present, the design deficiencies of LED solar lamps on the market are mainly manifested in three aspects: one is that there is no design for the characteristics of LEDs to improve the luminous efficiency of existing LEDs; the other is that the matching between LEDs and batteries is not fully considered. , resulting in a low utilization rate of the electric energy in the storage battery; the third is that the cost of the entire lamp is not ultimately reduced by greatly reducing the cost of solar cells and storage batteries.
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[0014] Example: Taking the luminous efficiency of a 1-watt LED applied to an LED solar street lamp as an example, take the battery voltage in the circuit as 12V. If the LED’s saturated working current is 350mA, the forward voltage drop of the LED is about 3.5V. At this time, only 3 LEDs can be connected in series in the driving circuit, and the forward voltage drop of the LEDs after the series connection is 10.5V, which shows that part of the electric energy is consumed in the circuit. In the present invention, the forward voltage drop of the LED is designed to be 3V, and then 4 LEDs can be connected in series with the 12V battery, so that the utilization rate of electric energy is increased to more than 94%. According to the volt-ampere characteristics of the LED, the forward voltage drop of the LED decreases with the decrease of the working current. Therefore, reducing the working current of the LED can make the forward voltage drop of the LED equal to 3V, so that 4 LEDs can be ...
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The invention discloses a method for improving light efficiency of LED solar street lamp with big power. Solar battery module is connected with controller and the storage battery stores electricity by the controller. A driving circuit is set between the storage battery and the LED lamp. The storage battery transports electricity to LED lamp. The working current of driving circuit is less than the rating current of LED so that LED lamp with unsaturated working current emits light and it matches with the driving circuit in voltage. One or more LED is connected with the original LED in series in LED street lamps. The invention improves the light efficiency of solar street lamp by decreasing LED working current and at the same time the utilization ratio of electricity can be improved to more than 49%.
Description
Technical field [0001] The invention relates to a solar street lamp using a white high-power LED as a light source, and in particular to a method for improving its light efficiency. Background technique [0002] Solar street lights using white high-power LEDs (LEDs for short) as light sources have developed rapidly in the past two years. This is mainly due to the long life and high luminous efficiency of LEDs. The structure is connected to the controller through solar cell components, and the battery stores electrical energy through the controller. And can deliver electric energy to LED lamps. [0003] At present, there are mainly three typical circuits for driving circuits between LED lamps and batteries: one is to use a current-limiting resistor circuit; the other is to use a constant current circuit; the third is to use a DC / DC boost circuit, which has a part of electric energy Consumed on the current limiting resistor or constant current circuit, the utilization rate of the f...
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IPC IPC(8): F21S9/03H05B37/02F21W131/103F21Y101/02F21Y115/10
CPCY02B20/72
Inventor 林其国胡建红包书林陈和生
Owner JIANGSU WENRUN OPTOELECTRONICS