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電阻 Resistor

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Resistor Series SINLOON®
Description: Carbon Film - CFR Description: Cement Resistor - CM Description: Fixed Power - HPD
Power: 1/16W ~ 3W Power: 2W ~ 50W Power: 10W ~ 3KW
Resistance: 1R ~ 10M Ω Resistance: 0.1R ~ 47K Ω Resistance: 0.5R ~ 800K Ω
Tolerance: ±5% Tolerance: ±5% Tolerance: ±5%
碳膜電阻 水泥電阻 電力型功率電阻
Description: Metal Film - FML Description: Metal Film - FMF Description: Carbon Film - FCR
Power: 1/4W ~ 2WS Power: 2W ~ 50W Power: 1/4W - 3W
Resistance: 0.1R ~ 0.99 Ω Resistance: 10R ~ 1M Ω Resistance: 1R ~ 10M Ω
Tolerance: ±1%, ±5% Tolerance: ±1%, ±5% Tolerance: ±5%
低阻值不燃性金屬膜電阻 金屬膜電阻 不燃性碳膜電阻
Description: Forming Type Description: Fuse Resistor - FR Description: Heat Resistor - HWW
Power: 1/8W ~ 5W Power: 1/4W ~ 3WS Power: 1/2W - 10W
Resistance: Resistance: 1R ~ 1K Ω Resistance: 1R ~ 1K Ω
Tolerance: Tolerance: ±2%, ±5% Tolerance: ±5%
成型電阻 保險絲電阻 繞線發熱電阻
Description: Metal Film - HPMF Description: MELF Carbon - MCF Description: MELF Metal - MMF
Power: 1/4W ~ 1W Power: 1/8W ~ 3WS Power: 1/8WS ~ #WS
Resistance: 10R ~ 10M Ω Resistance: 1R ~ 10M Ω Resistance: 1R ~ 10M Ω
Tolerance: ±0.05%, ±1% Tolerance: ±5% Tolerance: ±1%, ±5%
高精密金屬膜電阻 碳膜晶圓電阻 金屬膜晶圓電阻
Description: Metal Surge - MAS Description: MELF Dimension Description: MELF Glaze - MMG
Power: 1/8W ~ 3W Power: Power: 1/4W ~ 3W
Resistance: 10R ~ 1G Ω Resistance: Resistance: 100K ~ 1M Ω
Tolerance: ±5%, ±10%,±20% Tolerance: Tolerance: ±1%,±2% ,±5%,±10%
脈衝型晶圓電阻(高壓) 保險絲晶圓電阻 玻璃釉高壓晶圓電阻
Description: High Ohm - MGHO Description: MELF Fuse - FRM Description: MELF Glaze - MMG
Power: 1/8W ~ 2WS Power: 1/8W ~ 3WS Power: 1/4W ~ 3W
Resistance: 100K ~ 50GK Ω Resistance: 1R ~ 5K Ω Resistance: 100K ~ 1M Ω
Tolerance: ±0.1%,±25%,±0.5% Tolerance: ±2%,±5% Tolerance: ±1%,±2% ,±5%,±10%
高精密金屬膜晶圓電阻 保險絲晶圓電阻 玻璃釉高壓晶圓電阻
Description: Small Precision - SPM Description: Molding Res.-HPMD Description: Metal Film - HPMF
Power: 1/8W ~ 4Wu Power: 1/4W - 1/2W Power: 1/4W-1W
Resistance: 10R ~ 1M Ω Resistance: 10R ~ 1M Ω Resistance: 10R ~ 1M Ω
Tolerance: ±0.1%,±25%,±0.5% Tolerance: ±0.02%,±0.05%,±0.1% Tolerance: ±0.05%.
小型化高精密金屬膜電阻 模壓高精密金屬膜電阻 高精密金屬膜電阻
Description: Zero Ohm - Jumper Description: Surge Resistor - SUR Description: Glezed Resistor - MG
Power: 1/8W ~ 2W Power: 1/2W ~ 2W Power: 1/8W~3WS
Resistance: Zero ohm Resistance: 3.3R ~ 1M Ω Resistance: 50K ~ 10G Ω
Tolerance: Tolerance: ±5%,±10%,±20% Tolerance: ±0.5%,±1%,±5%,±10%
零歐姆及跳線 脈衝型高壓電阻 玻璃釉(金屬)高壓高阻值電阻器
Description: Wire wound - WWR Description: Ultra Metal - UMR Description: Precision Metal - PMF
Power: 1/2W ~ 15W Power: 0.4W ~ 3W Power: 1/8W ~ 3WS
Resistance: 0.1R ~ 4.7K Ω Resistance: 1R ~ 10M Ω Resistance: 0.1R ~ 1M Ω
Tolerance: ±1%,±5%,±10% Tolerance: ±1%,±2%,±5% Tolerance: ±0.1%,±0.25%,±0.5%
繞線電阻 超小型化金屬膜電阻 高精密金屬膜電阻
Description: Metal Oxide  - MOS Description: Metal Film - MFS Description: Metal Film - MFR
Power: 1/2WS ~ 7WS Power: 1/4WS ~ 2W Power: 1/4WS ~ 2W
Resistance: 1R ~ 510K Ω Resistance: 0.1R ~ 100K Ω Resistance: 0.1R ~ 100K Ω
Tolerance: ±2%,±5%,±10% Tolerance: ±1%,±2%,±5% Tolerance: ±1%,±5%.
小型化氧化膜電阻器 小型化高精密金屬膜電阻器 金屬膜電阻
Description: Carbon Film - CRS Description: Network - NR Description: TO-220 Resistor - ML
Power: 1/4WS ~ 3WS Power: 1/8W~1/4W (5-16pin) Power: 18W ~ 100W
Resistance: 1R ~ 1M Ω Resistance: 10R ~ 1M Ω Resistance: 0.1R ~ 1M Ω
Tolerance: ±5%,±10% Tolerance: ±2%,±5% Tolerance: ±1%,±5%.
小型化碳膜電阻器 排列電阻(排阻) TO-220 / TO-247 功率電阻
Description: Metal Alloy - PVR Description: Chip Array - CRA Description: Color Code (E24/E96)
Power: 1W ~ 10W Power: 1/8W~1/4W (4R/8pin) Power: Standard
Resistance: 5m ~ 300m (0.005R) Resistance: 10R ~ 1M Ω Resistance: Full Series
Tolerance: ±0.1% ~ ±5% Tolerance: ±2%,±5% Tolerance: Full Series
高精密模壓無感合金電阻 貼片型排列電阻(排阻) 標準電阻色碼及其它代碼表示法參考資料

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最近更新在 週六, 21 十一月 2015 02:01  
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Newsflash

LED 光度控制

LED驅動芯片 LED 光度控制

 

LED 光度控制

要改變LED的光度有兩種方式:直接改變流過LED的電流,或以快速開關LED以達至改變LED的平均功耗。

要設定LED光度,最直接的方法就是設定LED的電流,LED光度與電流並不成線性關系,要知道什麼的電流值才可以達到預期的光度,可以參考生產商資料提供有關電流與光度關係的資料,又或以可變電流源推動LED下找出合適電流值。

LED光度與電流並不成線性關系,若在使用中須要調變光度,以線性電路產生所需控制訊號的改變較難達至預期相對應的光度變化。

D是佔空比,D=0%LED全閉,D=100%LED全導通,改變佔空比可任意調變LED光度  D 是佔空比

另一改變LED光度的方法是快速開關LED,以脈衝寬度調製(Pulse width modulation - PWM),在每個重複的開關週期內,改變導通與關閉的時間比例(也即是占空比),改變流經LED的平均電流(平均功耗),從而控制LED的光度,由於LED導通時工作在較大電流,偏壓比連續導通高,因此消耗在控制元件上的功耗較少,效率略高。只要閃爍頻率高於人眼的視覺暫留,LED看起來就象連續發光一樣。而只要改變占空比,LED的光度就能在使用中調變。

在白色LED使用脈衝寬度調製控制LED光度有另一好處,白色LED的色溫隨電流強弱而轉變,在脈衝寬度調製控制下,導通電流在不同光度下都不變,因此能在不同光度保持色溫不變。