000 02218nam a2200253 a 4500
001 vtls000037741
003 KUKTEM
005 20251114204357.0
008 090615t2008 my a f m 000 0 eng|d
020 _aTHE0006915(Local)
039 9 _a201906131044
_baida
_c201107132136
_dVLOAD
_c200908141629
_dVLOAD
_c200908141603
_dVLOAD
_y200906150936
_zida84
040 _aUMP
090 _aTK7871.89.L53 T38 2008 rs Bc.
100 0 _aMohd Taufik Ab Rahman
245 1 0 _aBuck-boost power LED driver using PIC microcontroller /
_cMohd Taufik Bin Ab Rahman
246 3 _aBuck-boost power LED driver using PIC microcontroller
_h[electronic resource]
260 _aKuantan, Pahang :
_bUMP,
_c2008
300 _a98 p. :
_bill. (some col.) ;
_c30 cm. +
_e1 computer disc
502 _aProject paper (Bachelor of Electrical Engineering (Power systems)) -- Universiti Malaysia Pahang - 2008
520 3 _aOne traditional low-cost way of driving LED in electrical applications uses a resistor in series with the LED device. Although this driving scheme is simple and inexpensive, it suffers several disadvantages. The LED current can vary substantially over the battery voltage range even in normal operation of the device, thus affecting the brightness and reducing the service life of the lighting device. Additionally, protection is needed from automotive voltage transients and reverse polarity. These disadvantages are typically resolved by using constant-current linear regulators. Besides driving the LED at a programmed current, these regulators can inherently protect from a reverse-polarity application and block voltage transients up to tens of volts. Linear current regulators do not require input EMI filters and can yield inexpensive LED driver solutions. However, both the resistor ballasts and the linear regulators exhibit low efficiency. They may become impractical for driving high-brightness LED loads due to the excessive heat dissipation. Therefore, switching power converters are needed for driving many signal and lighting LED devices.
650 0 _aLight-emitting diodes
650 0 _aProgrammable controllers
999 _aVIRTUA40
_c963
_d969
999 _aVTLSSORT0080*0200*0400*0900*1000*2450*2460*2600*3000*5020*5200*6500*6501*9992