Forum www.public4you.fora.pl Strona Główna

www.public4you.fora.pl
Forum gazetki blogowej The Public.
 

characteristics of light emitted

 
Napisz nowy temat   Odpowiedz do tematu    Forum www.public4you.fora.pl Strona Główna -> Statute
Zobacz poprzedni temat :: Zobacz następny temat  
Autor Wiadomość
pzl927o1r
Jakiś taki cichy
Jakiś taki cichy



Dołączył: 22 Lut 2011
Posty: 24
Przeczytał: 0 tematów

Ostrzeżeń: 0/5
Skąd: England

PostWysłany: Pon 3:42, 21 Mar 2011    Temat postu: characteristics of light emitted

flowing through the LED, constant current control to achieve. Figure 3.1 MCU controlled constant current programs based on the overall block diagram of the 3.1 theoretical basis for the constant current control circuit topology of the circuit for the BUCK.
BUCK for the constant voltage output when the input voltage and output voltage relationship: type 3.1 can be seen from the output voltage and duty cycle and input voltage are proportional. In the closed-loop control, taking the output voltage feedback signal compared with the preset reference voltage when the input voltage is constant, if greater than reduce the duty cycle D, is less than the time when the opposite, increasing D, in order to achieve regulated effect.
So, when BUCK circuit for constant current control, as long as the voltage feedback signal into a current feedback signal can achieve constant results. 3.2 The advantages and disadvantages of the MCU control program of the constant current control of constant current, constant power control scheme for the problems can be a good solution; First, the deviation of the LED for the life and impact of color.
Constant current control scheme, when a deviation or as the temperature and working time changes, as long as D constant,[link widoczny dla zalogowanych], the output current to the LED does not change much. Although LED forward current with temperature and working time change, but the deviation of each LED are not large, for the link up with multiple components of high-power LED LED lights,[link widoczny dla zalogowanych], and will not the life of the LED and the color have any effect. Secondly,[link widoczny dla zalogowanych], 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.


Post został pochwalony 0 razy
Powrót do góry
Zobacz profil autora
Wyświetl posty z ostatnich:   
Napisz nowy temat   Odpowiedz do tematu    Forum www.public4you.fora.pl Strona Główna -> Statute Wszystkie czasy w strefie EET (Europa)
Strona 1 z 1

 
Skocz do:  
Możesz pisać nowe tematy
Możesz odpowiadać w tematach
Nie możesz zmieniać swoich postów
Nie możesz usuwać swoich postów
Nie możesz głosować w ankietach


fora.pl - załóż własne forum dyskusyjne za darmo
Powered by phpBB © 2001, 2005 phpBB Group
deoxGreen v1.2 // Theme created by Sopel stylerbb.net & programosy.pl

Regulamin