TWI457052B - 狀態指示燈的亮度控制 - Google Patents

狀態指示燈的亮度控制 Download PDF

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Publication number
TWI457052B
TWI457052B TW102107088A TW102107088A TWI457052B TW I457052 B TWI457052 B TW I457052B TW 102107088 A TW102107088 A TW 102107088A TW 102107088 A TW102107088 A TW 102107088A TW I457052 B TWI457052 B TW I457052B
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Taiwan
Prior art keywords
change
luminosity
target
width modulation
signal
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TW102107088A
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TW201325319A (zh
Inventor
Bryan Hoover
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Apple Inc
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10Controlling the intensity of the light

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Claims (15)

  1. 一種用於改變一燈之一光度之方法,其包括:判定一信號內之一目標變化,該信號設定該光之該光度,該光之該光度具有一最小光度位準及一最大光度位準;判定該目標變化是否小於該信號之一最大允許變化;及若該目標變化小於該信號之該最大允許變化,則將該信號內之變化限制為該目標變化;或若該信號之該最大允許變化小於該目標變化,則將該信號內之變化限制為該信號之該最大允許變化,從而限制該光之該光度之一變化速率。
  2. 如請求項1之方法,其中該燈為一發光二極體。
  3. 如請求項1之方法,其中使用者可選擇該最大允許變化。
  4. 如請求項2之方法,其中:該信號係為一具有一負載循環之脈衝寬度調變信號;及該信號之變化係為該信號之負載循環之變化。
  5. 如請求項1之方法,其進一步包含:決定欲達到該光之該光度之一目標光度,其中該目標光度係至少部分基於周圍光位準之變化而決定;決定達到該目標光度之一最小時間;設定必須將該光度自一初始光度改變至該目標光度之一最小數量之計時器滴答聲;及使將該光之該光度自該初始光度改變至該目標光度之計時器滴答聲之數量至少等於該最小數量之計時器滴答聲。
  6. 一種光度控制電路,其包括:與一光通信之一開關,該光具有一最小光度位準及一最大光 度位準;一脈衝寬度調變產生器,其經組態以產生一脈衝寬度調變信號來控制該開關之操作;及與該脈衝寬度調變產生器通信之一控制暫存器,其經組態以藉由將該脈衝寬度調變之一最大允許變化或該脈衝寬度調變信號之一已決定目標值之其中一者提供至該該脈衝寬度調變產生器來決定該脈衝寬度調變信號之一負載循環;其中該電路經組態以判定該脈衝寬度調變信號之該已決定目標值是否小於該脈衝寬度調變信號之該最大允許變化;及若該脈衝寬度調變信號之該已決定目標值小於該脈衝寬度調變信號之該最大允許變化,則提供該已決定目標值至該脈衝寬度調變產生器;且若該脈衝寬度調變信號之該已決定目標值大於該脈衝寬度調變信號之該最大允許變化,則提供該最大允許變化至該脈衝寬度調變產生器。
  7. 如請求項6之電路,其中該開關包含一電晶體。
  8. 如請求項6之電路,其進一步包含一電源供應器。
  9. 如請求項8之電路,其中該電源供應器包含一電流源。
  10. 如請求項8之電路,其進一步包含一電流限制電路,其以電性串聯方式與該光耦合。
  11. 如請求項6之電路,其中該控制暫存器包含一16位元控制暫存器。
  12. 一種用於改變一燈之一光度之方法,其包括:判定該光之一初始光度;使用一周圍光感測器來判定周圍光位準之變化;決定欲達到該光之該光度之一目標光度,其中該目標光度係 至少部分基於周圍光位準之變化而決定;決定達到該目標光度之一最小時間;設定將該光度自該初始光度改變至該目標光度之一最小數量之計時器滴答聲;及使將該光之該光度自該初始光度改變至該目標光度之計時器滴答聲之數量至少等於該最小數量之計時器滴答聲。
  13. 如請求項12之方法,其進一步包含:判定該最小數量之計時器滴答聲是否大於1;且若該最小數量之計時器滴答聲大於1,則計算達成該目標光度之變化之大小;判定該變化之大小是否小於欲達到該目標光度之該最小數量之計時器滴答聲之兩倍;若該變化之振幅小於欲達到該目標光度之該最小數量之計時器滴答聲之兩倍,則將一最大變化設定為1;若該變化之振幅未小於欲達到該目標光度之該最小數量之計時器滴答聲之兩倍,則決定一最大變化;檢查一初始限制是否小於該最大變化;且若該初始限制小於該最大變化,則將該最大變化設定為該初始限制;若該初始限制未小於該最大變化,則將每滴答聲之一允許脈衝寬度調變化設定為該最大變化。
  14. 如請求項13之方法,其中決定該最大變化包含使用整除法將該目標之變化除以該計時器滴答聲之該最小數量。
  15. 如請求項13之方法,其中該初始限制係為一不受約束之值。
TW102107088A 2006-11-09 2007-11-09 狀態指示燈的亮度控制 TWI457052B (zh)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/558,376 US8373355B2 (en) 2006-11-09 2006-11-09 Brightness control of a status indicator light

Publications (2)

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TW201325319A TW201325319A (zh) 2013-06-16
TWI457052B true TWI457052B (zh) 2014-10-11

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TW102107088A TWI457052B (zh) 2006-11-09 2007-11-09 狀態指示燈的亮度控制

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US (4) US8373355B2 (zh)
EP (3) EP2437575A3 (zh)
CN (1) CN101578917B (zh)
TW (2) TWI448206B (zh)
WO (1) WO2008060842A2 (zh)

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US20080111500A1 (en) 2008-05-15
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US9144132B2 (en) 2015-09-22
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US20100253239A1 (en) 2010-10-07
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US8373355B2 (en) 2013-02-12
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US8610367B2 (en) 2013-12-17

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