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On the white LED packaging and testing FAQ _led di

 
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Dołączył: 22 Lut 2011
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PostWysłany: Wto 3:17, 08 Mar 2011    Temat postu: On the white LED packaging and testing FAQ _led di

LED forward current with temperature and working time change, but the deviation of each LED are not large,[link widoczny dla zalogowanych], for the link up with multiple components of high-power LED LED lights, and will not the life of the LED and the color have any effect. Secondly, the use of closed-loop control,[link widoczny dla zalogowanych], can achieve a high output current accuracy. Can guarantee the consistency of light. Again, the power of compatibility issues. MCU-compatible constant current control scheme below rated power LED lights.
For the series of LED lights, change the size of the output power, but only changed the number of LED lights to LED lights n and output voltage, output current does not change the size. When the output power than the rated power hour, plus the LED lights on the clamping voltage, the output voltage to the LED is rated at this time still, so the current flowing through the LED will become large, making the current feedback signal is greater than the baseline voltage, the duty cycle becomes smaller, the output voltage, current flows through the LED's are small, until the rated current value.
Rated power so it can be compatible with the following LED lights. The problem for the no-load losses can be used to detect whether a load access MCU, LED access when not detected, you can turn off the circuit after the class BUCK, reducing the load loss. Finally,[link widoczny dla zalogowanych], the SCR compatibility issues. Constant power control scheme, using pure hardware mode to stabilize the SCR turns on, the adaptability of dimmer or limited.
There are 60cm, 80cm and so on, different users have different specifications. And can be arbitrarily cut off the light can not affect any extension. The FPC flexible material can be bent, folded, winding, three-dimensional space can be moved around and stretch without breaking. Irregular areas for small places and space, but also because any bending and winding can be suitable for any combination of advertising in a variety of decorative motifs.
, LED light bar is made with the PCB board assembly circuit board hardware, LED useful for the assembly of SMD LED, LED-line is also useful for assembly, depending on the different needs of different components. Light bar has the advantage of easier fixation, processing and installation are relatively easy; disadvantage is not free to bend, not suitable for irregularities. SMD LED light bar have used 18 LED, 24 �� LED, 30 �� LED, 36 �� LED, 40 �� LED such a good variety of specifications; with line LED's are 18,[link widoczny dla zalogowanych], 24, 36, 48 different specifications, there is also a positive side, the side known as the Great Wall Light shining.


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