Yangzhou Global Solar's simple analysis and introduction of LED street light design requirements solar street light-l

1 LEDs for lighting are characterized by the function of directional emission of light, because almost all power LEDs are equipped with reflectors, and the efficiency of such reflectors is significantly higher than that of lamps and lanterns. In addition, the efficiency of the self-reflector has been included in the light efficiency detection of the LED. Road lamps using LEDs should make use of the directional light emission characteristics of LEDs as much as possible, so that each LED in the road lamps directly emits light to each area of u200bu200bthe illuminated road, and then uses the auxiliary light distribution of the lamp reflector to achieve A very reasonable comprehensive light distribution of road lamps. It should be said that to truly meet the illuminance and illuminance uniformity requirements of CJJ45-2006, CIE31 and CIE115 standards, the lamps should contain three light distribution functions to achieve better realization. , and the LED with a reflector and a reasonable beam output angle itself has a good primary light distribution function. In the lamp, the installation position of each LED and the direction of the emitted light can be designed according to the height of the street lamp and the width of the road, so that a good secondary light distribution function can be realized. The reflector in such lamps is only used as an auxiliary three-time light distribution method to ensure better uniformity of road illumination. In the actual design of road lighting fixtures, it is possible to fix each LED on the fixture with a spherical joint on the premise of basically setting the radiation direction of each LED. When the fixtures are used for different heights and illumination widths When , the irradiating direction of each LED can achieve satisfactory results by adjusting the spherical gimbal. When determining the power and beam output angle of each LED, according to E(lx)u003dI(cd)/D(m)2 (the law of inverse square of the distance between light intensity and illuminance), it is possible to calculate the basic selection of each LED separately. The power that the beam should have at the output angle, and the light output of each LED can reach the expected value by adjusting the power of each LED and the different power output by the LED drive circuit to each LED. These adjustment methods are unique to road lamps that use LED light sources. By making full use of these characteristics, it is possible to reduce the lighting power density and achieve the purpose of energy saving on the premise of satisfying the illuminance and illuminance uniformity of the road surface. 2. The power supply system of LED solar street light is also different from traditional light sources. The constant current driving power required by LED is a cornerstone to ensure its normal operation. Simple switching power supply solutions often cause damage to LED devices. How to make a group of LEDs tightly packed together safely is also an indicator to investigate LED solar street light. The requirement of the LED for the drive circuit is to ensure the characteristics of constant current output. Because the junction voltage changes relatively small area when the LED is working in the forward direction, the constant LED drive current is guaranteed to basically ensure the constant LED output power. For the current situation of unstable power supply voltage supply in our country, it is very necessary for the driving circuit of the road lamp LED to have a constant current output characteristic, which can ensure the constant light output and prevent the over-power operation of the LED.
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