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Dołączył: 01 Kwi 2011
Posty: 5
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Skąd: England
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 Wysłany: Pon 5:15, 04 Kwi 2011 Temat postu: article18 |
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flowing in the LED, constant present control to obtain. Figure SEVERAL. 1 MCU controlled constant latest programs determined by the entire block diagram in the 3. 1 theoretical basis for any constant latest control enterprise topology in the circuit for any BUCK. BUCK for any constant voltage output once the input voltage plus output voltage relationship: type SEVERAL. 1 is seen from the output voltage plus duty circuit and input voltage are generally proportional. In the closed-loop manage, taking that output voltage comments signal weighed against the set reference voltage once the input voltage will be constant, if greater than reduce that duty circuit D, is less than the time once the opposite, raising D, in order to achieve regulated effect. So, when MONEY circuit with regard to constant latest control, so long as the voltage responses signal into a current comments signal can easily achieve continuous results. SEVERAL. 2 The advantages and drawbacks of the particular MCU handle program in the constant existing control regarding constant current, constant power control scheme for any problems could be a good solution.
First, the deviation in the LED for any life plus impact of color. Frequent current manage scheme, whenever a deviation or because the temperature along with working occasion changes, so long as D frequent, the productivity current into the LED won't change a great deal. Although DIRECTED forward present with temps and being employed time transform, but the deviation of each one LED usually are not large, for any link up with many components involving high-power ENCOURAGED LED lighting, and won't the life in the LED as well as the color have got any impact. Secondly, the employment of closed-loop manage, can achieve a top output current accuracy. May guarantee that consistency connected with light. Once more, the power of match ups issues. MCU-compatible frequent current manage scheme beneath rated electrical power LED gizmos. ilicon carbide: SiC to be a substrate content second only into the extent in the application involving sapphire, there is no third.
GaNLED substrate with regard to commercial generation. SiC substrates own good chemical substance stability, good conductivity, energy conductivity, and usually do not absorb visible light, for example.,but also less prominent, such because the price is too big, the crystal quality Al2O3 along with Si consequently difficult to obtain good machining functionality is rather poor, Moreover, SiC substrates absorb ultraviolet light source below 380 nm, 380 nm is not suitable with regard to development underneath UV BROUGHT ABOUT. SiC substrate helpful as conductivity in addition to thermal conductivity, can solve the power type GaNLED warmth dissipation gadgets, it is due to the field of semiconductor lighting style technology a significant role. Weighed against sapphire, SiC in addition to GaN epitaxial film lattice coordinating is much better. In addition, SiC carries a blue light-emitting homes, and lower resistivity products, can end up being produced Thermal Grease plus soft silicone cushion thermal conductivity energy grease along with soft silicone pad into a simple assessment 1. Energy conductivity: thermal conductivity regarding thermal grease energy conductivity more than that involving soft silicone cushion,[link widoczny dla zalogowanych], respectively 4. 0-5. 5w/mk in addition to 1. 75-2. 75w / m A COUPLE OF. Insulation: Thermal Grease with the addition of the shiny powder insulation is poor, soft silicone sleeping pad, good efficiency thermal. 1 mm solid electrical efficiency index of more than 3000 volts.
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