Improvement in power efficiency and utilization rate of LED driver in the packaged LEDs
| Autor: | Shih-Min Lin, 林世民 |
|---|---|
| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 This paper is to be applied for when the current LED lighting power needed to analyze and study how to improve the efficiency of LED drive power application paper describes the circuit and its application in illumination can reduce the drive current due to LED VF voltage variations the output current has changed so much and thus affect the overall light output produce different lumen (lm) values, affect the overall lighting vision. LED is the most likely to replace conventional lighting elements, so the paper also introduced the principle of LED's move to do to stimulate the principle of phosphor, color system conversion efficiency, packaging process. Today LED packaging technology is growing, although improved, but its VF value for packaged LED is still unable to control in a very precise range, so often there will be some deviation from the specification but it is the yield of the LED will now have to rely on with BIN the way to do this yield the LED of the action, but before making a go of action is necessary to carefully choose the drive power, Because LED If the difference between the VF 0.2V, then when it more stars strung together, the pressure is likely to reach more than 10 a few volts, so the driver must be able to supply covers the voltage difference in these ranges, and even more in order to use. When the drive power supply design is complete, you must go through a lot of verification, such as verification of the circuit, safety verification, the text proposed in the special analytical methods EMI, through pragmatic actual measurements, making a group is not added EMI drive power and a group of circuit elements utilizing EMI, EMI components through this circuit to increase or decrease, to watch one of the changes, the effectiveness and feasibility of verification by the changes therein. Keywords: electric excitation light, the energy gap, lumens, brightness, constant current diodes, detect network, radiation interference, conduction disturbances, laser diode. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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