02218nam a2200253 a 4500 vtls000037741 KUKTEM 20251114204357.0 090615t2008 my a f m 000 0 eng|d THE0006915(Local) 201906131044 aida 201107132136 VLOAD 200908141629 VLOAD 200908141603 VLOAD 200906150936 ida84 UMP TK7871.89.L53 T38 2008 rs Bc. Mohd Taufik Ab Rahman Buck-boost power LED driver using PIC microcontroller / Mohd Taufik Bin Ab Rahman Buck-boost power LED driver using PIC microcontroller [electronic resource] Kuantan, Pahang : UMP, 2008 98 p. : ill. (some col.) ; 30 cm. + 1 computer disc Project paper (Bachelor of Electrical Engineering (Power systems)) -- Universiti Malaysia Pahang - 2008 One 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. Light-emitting diodes Programmable controllers 0 0 0 1 20000 20000 2019-09-04 0 TK7871.89.L53 T38 2008 rs Bc. 0000037302 2019-09-04 00:00:00 1 2019-09-04 PSM 0 0 0 1 20000 20000 2019-09-04 0 CD 3215 | TK7871.89.L53 T38 2008 rs Bc. 0000037303 2019-09-04 00:00:00 1 2019-09-04 PSM VIRTUA40 963 969 VTLSSORT0080*0200*0400*0900*1000*2450*2460*2600*3000*5020*5200*6500*6501*9992