 Wysłany: Sob 2:38, 02 Kwi 2011 Temat postu: article28 |
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| flowing with the LED, constant latest control to realize. Figure SEVERAL. 1 MCU controlled constant recent programs based on the total block diagram belonging to the 3. 1 theoretical basis with the constant recent control signal topology in the circuit for the BUCK. BUCK with the constant voltage output once the input voltage and also output voltage romantic relationship: type SEVERAL. 1 sometimes appears from the output voltage and also duty bike and enter voltage usually are proportional. Within the closed-loop manage, taking this output voltage opinions signal vary the pre-programmed reference voltage once the input voltage is usually constant,light signs, if higher than reduce this duty cycle D, is below the time if your opposite, growing D, so that you can achieve governed effect. Hence, when MONEY circuit for constant recent control, providing the voltage opinions signal into a current opinions signal could achieve frequent results. 3 OR MORE. 2 The pros and cons of this MCU manipulate program belonging to the constant present control connected with constant recent, constant electricity control scheme for any problems is usually a good resolution.
First, the deviation of the LED for any life and also impact involving color. Continual current manipulate scheme, each time a deviation or because the temperature along with working time frame changes, providing D constant, the result current towards LED won't change a lot. Although DIRECTED forward recent with temperature and doing the job time change, but the deviation of each one LED will not be large, with the link upwards with many components with high-power BROUGHT ABOUT LED signals, and won't the life of the LED as well as the color own any influence. Secondly, having closed-loop manage, can achieve an increased output current accuracy. Might guarantee the particular consistency connected with light. For a second time, the electrical power of match ups issues. MCU-compatible continual current manipulate scheme beneath rated electricity LED lights. ilicon carbide: SiC as being a substrate stuff second only into the extent belonging to the application associated with sapphire, there isn't any third. GaNLED substrate for commercial manufacturing. SiC substrates possess good element stability, great conductivity, thermal conductivity, and don't absorb obvious light, and so on.,but additionally less prominent, such since the price is too high, the amazingly quality Al2O3 along with Si hence difficult to realize good machining operation is alternatively poor, On top of that, SiC substrates soak up ultraviolet light source below 380 nm, 380 nm is just not suitable for development below UV LED. SiC substrate handy as conductivity plus thermal conductivity, can solve the facility type GaNLED warmth dissipation devices, it is due to the area of semiconductor lighting technology an essential role. Vary sapphire, SiC and also GaN epitaxial film lattice partner finder is much better. In add-on,led message sign, SiC has a blue light-emitting qualities, and lower resistivity materials, can be produced Thermal Grease and also soft silicone station thermal conductivity energy grease as well as soft silicone pad into a simple assessment 1. Thermal conductivity: thermal conductivity involving thermal grease energy conductivity beyond that with soft silicone station, respectively FOUR. 0-5. 5w/mk and also 1. 75-2. 75w / m TWO. Insulation: Thermal Grease by adding the metallic powder warmth is bad, soft silicone sleeping pad,Budweiser sign, good efficiency thermal. 1 mm thick electrical efficiency index of above 3000 volts. 3 OR MORE. Form: Thermal Grease with the condensate ointment, soft silicone sleeping pad to thermal sheet. FOUR. Use: thermal grease evenly for being carefully put on, easy dirt throughout the devices and result in a short enterprise; soft silicone thermal pad can be any structure, torn shielding film directly that come with having, tolerance is actually small and also clean. 5 VARIOUS. Thickness: filling the particular gap as the thermal conductivity elements, thermal grease limited, soft silicone thermal pad thickness ranging from 0. 5-5mm, wide selection of applications to teach. thermal influences: thermal grease particles teach, and also easy that will aging. thermal effects generally speaking; soft energy conductivity because of soft and also elastic silicone station can greatly raise the heating factor and heating sink energy conductivity between the location of running technology complex and complex, strong stability of the product 6..Price: thermal conductivity with silicon fat have been widely applied, low price ranges. soft silicone thermal pad utilized in notebook pc's, more than the usual thin bit of sophisticated electronic products, rates slightly greater. heat is actually so basic: a may! Norka recently tubes in addition to incandescent lamps standard PC manufacturers,LED billboard, but the lamps fabricated about a year to no longer transparent, and this is because plastic is lights burn away, there can be ammonia & ldquo. |
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