201236512 六、發明說明： 【發明所屬之技術領域】 本龟明係有關一種|區私 〇 其是一種驅動光源的電# 、工制器及驅動方法，尤 电略、控制器和方法。 【先月U技術】 近年來，發光二極體 程技術之進步而隨之改良。(LLED)且2源經由在材料和製 色鮮盤等特點，可以應用有⑧效率、長壽命、顏 用品等領域。比如，L;广車、電腦、電信、軍事和日 明光源。 燈可以替代習知的白熾燈作為照 圖1所示為種習知的⑽驅動電 LED驅動電路1〇〇利用丨 00的不思圖 源。LED鏈106包含一电4 LED String) 106作為光 於將輸入的直流電厂堅電力轉換器劃 η轉換成期望的首流輪屮雪廢 Vmit，以對LED鏈1〇6佴 的置抓翰出電& m m/i 、電。與電力轉換器102耦接的開 關104能致能或除能給Lp ^ 、且。電力轉換器102接收來自電流偵測電阻 Rsen的回授信號並調節輪 木目201236512 VI. Description of the invention: [Technical field of invention] This turtle is related to a kind of area 私 〇 It is a kind of electric drive, drive and drive method for driving light source, especially controller, controller and method. [First Moon U Technology] In recent years, the progress of the light-emitting diode technology has been improved. (LLED) and 2 sources can be applied to areas such as 8 efficiencies, long life, and cosmetics through the characteristics of materials and color fresh disks. For example, L; Guangzhou, computer, telecommunications, military and Japanese light sources. The lamp can be used in place of the conventional incandescent lamp as shown in Fig. 1. (10) The driving electric LED driving circuit 1 utilizes the unintentional source of 00. The LED chain 106 includes an electric 4 LED String) 106 as a light to convert the input DC power plant power converter into a desired first-round rim snow waste Vmit, to capture the LED chain 1〇6佴Electricity & mm / i, electricity. The switch 104 coupled to the power converter 102 can enable or disable Lp^, and. The power converter 102 receives the feedback signal from the current detecting resistor Rsen and adjusts the wheel
..AΛ ^ 珣出電壓v〇ut以使LED鏈106產 生期望的党度。该習知方安A 万案的缺點之一是，該期望亮度是 預先設定好的。在操作中，τ加μ， T LED鏈的亮度輸出被設定 為一預设值’使用者無法調節。 圖2所示為$種習知的LED驅動電路测的示意 圖。電力轉換器1〇2將輪入的直流電壓Vin轉換成期望的 直流輸出電壓V〇ut ’以對LED鏈⑽供電哨電力轉換器 0781 -TW-CH Spec+Claim(sandra.t-2012020 ] ).doc . 201236512 1 二轉接的：關104能致能或除能給LED鏈ι〇6的輸入電 ^或關斷哪燈。LE〇鍵106與線性LED電 ^周=2_接。線性LED電流調節器中的運算放 大益210比較參考信號和來自電流偵測電阻— 號因並產生控制信號，以線性的模式調節電晶 ，m ，流經⑽鏈雨的電流可據此調節。 在此方案中，為控制鍵106的亮度輸出，使 置’例如一個專門設計之具有調節按紐或是 此接收遙控控制信號的開關，來調節參考信號卿。 【發明内容】 本發明的目的為提供-種光源驅動電路，包括： 至:電源’接收來自該電源的電能並根據多個 控制^為-光源提供—調節後電能；以及—調光 益，耗接至該轉換器，監測連接於該電源和該轉換器= 的一電源開關，該調光控制器接收指示該電源開關的 二 =-顏色改變信號，並接收指示該電源開關的： 第二組動作的—賊請求錢；其巾， :到該顏色改變信號時，控制該多個控制信號改= =色’且該調光控制器在接收到該調光請求信號時卞 制该多個控制信號調整該光源的一亮度。 控 本發明還提供-種調光控制器，控制從一轉換 到-光源的電能，包括：—監測端點，接; 該監測信㈣科接L㈣職n之 開關的-導通狀態，·以及多個調光端點，提供多個控制ς 0781 -TW-CH Spec-f-Claim(sandra. t-2012020 ] ).doc 'i ^ 'i ^201236512..AΛ ^ The voltage v〇ut is extracted to cause the LED chain 106 to produce the desired party. One of the disadvantages of the conventional Fangan A million case is that the desired brightness is preset. In operation, τ plus μ, the brightness output of the T LED chain is set to a preset value' that the user cannot adjust. Figure 2 shows a schematic diagram of a conventional LED driver circuit. The power converter 1〇2 converts the in-line DC voltage Vin into a desired DC output voltage V〇ut' to power the LED chain (10) to the whistle power converter 0871-TW-CH Spec+Claim (sandra.t-2012020) .doc . 201236512 1 Two-way: Off 104 can enable or disable the input of the LED chain 〇6 or turn off the light. The LE〇 key 106 is connected to the linear LED ^^=2_. The operational amplifier in the linear LED current regulator compares the reference signal with the current-sense resistor and generates a control signal to adjust the crystal crystal in a linear mode. m, the current flowing through the (10) chain can be adjusted accordingly. In this arrangement, the reference signal is adjusted for the brightness output of the control button 106, such as a specially designed switch having an adjustment button or a remote control signal. SUMMARY OF THE INVENTION An object of the present invention is to provide a light source driving circuit, comprising: to: a power supply 'receives electric energy from the power source and provides power according to a plurality of control lights - and adjusts the power; and Connected to the converter, monitoring a power switch connected to the power source and the converter=, the dimming controller receives a second=-color change signal indicating the power switch, and receives the indication of the power switch: Action-thief requesting money; its towel, : when the color change signal is received, controlling the plurality of control signals to change == color' and the dimming controller clamps the plurality of controls when receiving the dimming request signal The signal adjusts a brightness of the light source. The invention also provides a dimming controller for controlling the electric energy from one to the light source, including: - monitoring the end point, connecting; the monitoring signal (4) is connected to the switch state of the L (four) position n, and more Dimming endpoints with multiple controls ς 0781 -TW-CH Spec-f-Claim(sandra. t-2012020 ] ).doc 'i ^ 'i ^201236512
號來控制該電能，A 個控制信號決定，2料源的—顏色和-亮度由該多 識別指示該f監測信號， 和指示該電__ 顏色改變信號 信號，以該調光控制器調整該多個控制 光控制器調整該多個控號時’該調 本發明還提破“度。 一轉換器傳_動方法，包括：將—電能從 間的-電源開關;接：丄=_於一電源和該轉換器之 指示該電源開關的—第一:=變信號，該顏色改變信號 整該光源的一顏色.挺、且▲，根據該顏色改變信號調 號指示該電源開關的-=-2 =求㈣’該調光請求信 信號調整該光源的動作，以及根據該調光請求 【實施方式】 明將結:==;=:施:給出詳細的說明。雖然本發 限定於這些實施例。相二這並非意指將本發明 本發，:二== 本二=:=::，，為了提供針對 ί技:r中具有通常知識者將：體：這f:體： 即，本發明同樣可以實施。在另外的_些實例/對^ 0781-TW-CH Spec+Claim(sandra.t-20120201 ).doc 6 201236512 家热知的方法、程序、元件和電路未作詳細描述，以便於 凸顯本發明之主旨。 圖3所不為根據本發明—實施例的光源驅動電路3〇〇 的方塊圖。在一實施例中，光源驅動電路300包括用於把 來自電源的交'錢人電壓Vin轉換為直流輸出電壓v〇ut 的=流/直流（AC/DC)轉換器3〇6，耦接於電源和交流/ 直机轉換器306之間用於選擇性將電源搞接至光源驅動電 路300的電力開關304，與交流/直流轉換器3〇6耦接用於 為LED鏈312提供調節後電力的電力轉換器31〇，與電力 轉換盗310耦接用於接收表示電力開關3〇4操作的開關監 測“號、並根據開關監測信號調節來自電力轉換器調 節後電力的調光控制器308,以及用於監測流經1^1)鏈312 的led電流的電流感測器314。在一實施例中’電力開關 304是固接於牆上的導通/關斷（〇n/〇ff)開關。 在操作中，交流/直流轉換器306將輸入交流電壓Vin 轉換為直流輸出電壓Vout。電力轉換器310接收直流電壓 Vout並為LED鏈312提供調節後的電力。電流感測器314 產生電流感測信號，其表示流經Led鏈312的LED電流位 準。調光控制器308監測電力開關304的操作，接收來自 電流感測器314的電流感測信號，並回應電力開關3〇4的 操作控制電力轉換器310以調節LED鏈312的電力。在一 實施例中，調光控制器308操作於類比（anal〇g)調光模 式’透過調節-個表示電流峰㈣參考信絲調節· 鍵312的電力。在另-實施例中，調光控制器3〇8工作於 驟變（burst)調光模式，透過調節一脈衝寬度調變（pwM) 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 7 201236512 h號的貝任週期來調節LED鏈312的電力。透過調節led 鏈312的電力，LED鏈312的亮度輸出能夠相應地被調節。 圖4所示為根據本發明一實施例的光源驅動電路4〇〇 的電路圖。圖4將結合圖3進行描述。圖4中與圖3編號 相同的元件具有類似功能，為簡明起見在此不重複描述。 光源驅動電路400包括電力轉換器31〇 (如圖3所 不）’其耦接至電源和LED鏈312，用於接收來自電源的電 力並為LED鏈312提供調節後電力。在圖4的實例中，電 力轉換器310可為包括電感li、二極體])4和控制開關Q16 的降壓（buck)轉換器。在圖4中所示的實施例中，控制 開關Q16位於調光控制器308之外。在其他的實施例中， 控制開關Q16可以整合於調光控制器3〇8之中。 調光控制器308接收表示電力開關（例如耦接於電源 和光源驅動電路之間的電力開關3Q4)的操作的開關監測 “唬，並根據該開關監測信號控制與lED鏈312串聯耦接 的控制開關⑽’以調節來自電力轉鋪31Q (包括電感 L1、二極體D4和控制開關Q16)的調節後的電力。光源驅 動電路400進一步包括交流/直流轉換器3〇6，用於將交流 輸入電壓Vin轉換成直流輸出電壓v〇ut，以及電流感測器 314,用於監測流經LED鏈312的_電流。在圖4所示 的實例中，交流/直流轉換器3〇6可為包括二極體M、D2、 D7、D8、D10和電容C9的橋式整流器。電流感測器314可 包括電流偵測電阻R5。 在一貫她例中，調光控制器308的端點包括： HV_GATE、SEL、CLK、RT、VDD、CTRL、MON 和 GND。端點 0781 -TW-CH Spec+Claim(sandra.t-20120201 ),doc 8 201236512 HV—GATE經由電阻R3與開關Q27耦接，用於控制與led鏈 312耦接的開關Q27的導通狀態（如導通/關斷的狀態）。 電合C11耦接於端點hv一GATE和地之間，用於調節開關收7 的閘極電壓。 使用者可以選擇藉由把端點SEL經由電阻R4連接到 地（如圖4所示）或者把端點SEL直接連接到地，而選擇 一調光模式’例如類比調光模式或驟變調光模式。 端點CLK經由電阻R3耦接至交流/直流轉換器3〇6， 且經由電阻R6耦接到地。端點CLK接收一個表示電力開 關304操作的開關監測信號。在一實施例中，開關監測信 號在電阻R3和電阻R6之間的一個共同節點（c〇mm〇n n〇de) 上產生。電容C12與電阻R6並聯耦接，用於過濾不期望 的雜訊。端點RT經由電阻以與地耦接，用於確定由調光 控制器308產生的脈衝信號的頻率。 端點VDD經由二極體！)9與開關Q27耦接，用於為調 ，控制器308 #電。在—實施射，-個能量單元（如電 今C10)耦接於端點VDD和地之間，當電力開關關斷 時為調光控制器308供電。在另一實施例中，能量單元整 合於調光控制器308内部。端點GND與地耦接。 端點CTRL與控制開關qi6耦接。控制開關以6與LED 鏈312以及開關Q27串聯耦接，並經由電流感測電阻R5 耦接到地。調光控制器308使用經由端點CTRL的控制信 號控制控制開關Q16的導通狀態（如導通與斷開狀態）， 以調節來自f力轉換H 31G的調節後電力。端點M⑽與電 流感測電阻R5耦接，用於接收表示流經LED鏈312的LE]) 0781 -TW-CH Spec+CIaim(sandra.t-20120201 ).doc 9 201236512 電流的電流感測信號。當開關Q27導通時，調光控制器308 藉由控制控制開關Q16來調節流經LED鏈312的LED電流。 在操作中，當電力開關304導通時，交流/直流轉換 器306將輸入交流電壓Vin轉換為直流輸出電壓V〇ut。端 點HV_GATE上的預設電壓經由電阻R3施加於開關Q2?上， 以導通開關Q27。 如果調光控制器308導通控制開關Q16,直流電壓 Vout會對LED鏈312供電並對電感L1充電。LED電流流 經電感LI、LED鏈312、開關Q27、控制開關Q16以及電 阻R5到地。如果調光控制器308關斷控制開關Q16，則 LED電流流經電感LI、LED鏈312和二極體D4。電咸L1 放電以對LED鏈312供電。因此，調光控制器308可以藉 由控制控制開關Q16而調節來自電力轉換器31〇的調節後 電力。 當電力開關304關斷，電容C1 〇放電以對調光控制器 308供電。電阻R6兩端的電壓下降到〇 ,因此一個指示電 力開關304關斷操作的開關監測信號可經由端點CLK被調 光控制器308監測到。類似的，當電力開關3〇4導通，電 阻R6兩端的電壓升至一預設電壓值，因此一個指示電力 開關3G4導通操作的開關監測信號可經由端點ακ被調光 控制器308監測到。如果監測到關斷操作，調光控制哭3〇8 可以藉由把端點HV—GATE上的電壓下拉到〇 ' Q27,從而使得娜鍵31在電感u完成放電後被斷電。 回應關斷操作，調光控制器3〇8調節一個指示鏈犯 的期望亮度輸出的參考信號。因此，當電力開關別4下次 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).d< 10 201236512 導通時’ LED鍵312能夠根據調節後的期望亮度輸出產生 亮度輸出。換言之，LED鏈3以亮度輸出能夠由調光控 制器308回應電力開關3Q4的_操作而被調節。 圖5所不為根據本發明一實施例圖4中的調光控制器 308的例示性架構圖。圖5將結合圖4進行描述。圖^ 與圖4編號相同的元件具有類似的功能，為簡明起見在此 不重複描述。 调光控制器308包含觸發監測單元5〇6、調光器5〇2 和脈衝信號產生器5G4。觸發監測單元_經由齊納二極 體ZD1連接到地。觸發監測單元5〇6經由端點ακ接收指 示外部電力開關304的操作的開關監測信號，且當外部電 力開關304的操作在端點CLK被監測到時，產生驅動信號 以驅動計數器526。觸發監測單元5〇6還進一步控制開關 Q27的導通狀態。調光器5〇2產生參考信號腳，以類比 調光的模式調節LED鏈312的電力，或產生控制信號538, 調節脈衝寬度調變信號鳄叽的責任週期以調節LED鏈312 的電力。脈衝信號產生器5〇4產生脈衝信號，其可導通控 制開關Q16。調光控制器308還包括與端點VJ)D耦接的= 動及人電壓鎖疋（Under Voltage Lockout, UVL)電路 508， 用於根據不_電力狀況選擇性地導通調光控制器3〇8内 部的一個或多個元件。 在一實施例中，當端點VDD上的電壓高於第一預設電 壓’則啟動及欠電壓鎖定㈣5〇8將導通調光控制器3〇8 中所有的元件。當電力開關304關斷，如果端點VDD上的 電壓低於第二預設電壓，啟動及欠電壓鎖定電路5⑽將關 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 11 201236512 閉調光控制器3G8中除了觸發監測單⑽6和調光哭5〇2 元件以節省能量。當端點™上的電壓低於第 二頁=壓’啟動及欠電襲定電路_將進—步關閉觸 和調光器5〇2。在—實施例中，第-預設 ，[南於第二預設電壓’第二預設電壓高於第三預設電 堅。因為調光控制器308能夠經過端點_由電容⑽供 電，所以即使電力開關304關斷後，觸發監測單元5〇6和 调光器502還可以工作一段時間。 在調光控制1 308中，端點SEL與電流源哪减。 使用者可以藉由配置端點SEL (例如把端點狐直接與地 麵接’或是將端點SEL經由-個電阻與地耦接） 先模式。在-實施例t，調光模式透過測量== 電壓來決定。如果端點SEL直接與地輕 的電壓近似於〇。-控制電路(圖中未示出; 關540，關斷開關541和542。因此，調光控制器咖可 =工作於類_光模式，並且藉由調節參考信號來調 節LED鏈312的電力。在一實施例中，如果端點狐經由 具有一個預設阻值的電阻R4耦接到地（如圖4中所示）， 則端點SEL上的電壓大於〇。該控制電路依序關斷開關 540、導通開關541和導通開關542。因此，調光控制器 308工作於驟變調光模式，並藉由調節脈衝寬度調變信號 PWM1的責任週期來調節LED鏈312的電力。換言之，經由U 控制開關540、541、542的導通狀態，可以選擇不同的調 光模式。而開關540、541、542的導通狀態由端點上 的電壓決定。 0781-TW-CH Spec+Claim(sandra.t-20120201 ).doc \2 201236512 脈衝信號產生器504經由端點RT以及電阻R7耦接到 地，產生用於導通開關Q16的脈衝信號536。脈衝信號產 生器504可以有不同的配置，並不限於圖5中所示的配置。 在脈衝信號產生器504中，運算放大器510的非反相 輸入端接收預設電壓VI。因此運算放大器510的反相輸入 端電壓也為VI。電流Irt透過端點RT和電阻R7流到地。 流經金屬氧化物半導體場效電晶體（MOSFET )514和MOSFET 515的電流h與電流IRT相等。由於MOSFE1T 514和MOSFET 512構成電流鏡，因此流經MOSFE1T512的電流h也與電流 IRT相等。比較器516的輸出和比較器518的輸出分別與SR 正反器520的S輸入端和R輸入端耦接。比較器516的反 相輸入端接收預設電壓V2。比較器518的非反相輸入端接 收預設電壓V3。在一實施例中，V2大於V3且V3大於0。 電容C4耦接於MOSFET 512和地之間，且有一端與比較器 516非反相輸入端和比較器518反相輸入端輸入之間的共 同節點耦接。SR正反器520的Q輸出端與開關Q15及SR 正反器522的S輸入端耦接。開關Q15與電容C4並聯。 開關Q15的導通狀態（例如：導通/關斷）由SR正反器520 的Q輸出端決定。 電容C4兩端的初始電壓近似為〇，小於V3。因此SR 正反器520的R輸入端接收比較器518輸出的數位信號1。 SR正反器520的Q輸出端被設置為數位信號〇，其關斷開 關Q15。當開關Q15關斷，隨著電容C4由電流12充電，電 容C4兩端的電壓升高。當電容C4兩端電壓大於V2，SR 正反器520的S輸入端接收比較器516輸出的數位信號1。 0781 -TW-CH Spec-f-CIaim(sandra.t-20120201 ).doc 13 201236512 SR正反态520的Q輸出端被設置為數位信號工，其導通 關Q15。當開關Q15導通，隨著電容C4經由開關以5放電^ 電容C4兩端的電壓降低。當電容C4兩端的電壓下降到低 於V3，比較器518輸出數位信號丨，且SR正反器52〇的― 輸出端被設置為數位信號〇，其關斷開關Q15。接著電容 C4又由電流12充電。如此，經由上述過程，脈衝信號產^ 器504產生脈衝信號536，其包括在SR正反器52〇的q輪 出端上一系列的脈衝。脈衝信號536被傳送至邠正反器 522的S輸入端。 ° 。觸發監測單S 506透過端點ακ監測電力開關綱的 操作，且當電力開關304的操作在端點CLK被監測到，產 生-個驅動信號以_計數H 526。在—實施例中，當電 力開關304被導通，端點CLKJ^電壓上升至等於電 (圖4所示）兩端電壓的位準。#電力開關3〇4被關斷， 端點CLK上的電壓下降到〇。目此，指示電力開關綱 作的開關監雜號可以在端點咖被監_。在一實施例 中’當-個_猶在端點ακ被監剩時，觸發監測單 元506產生驅動信號。 觸發^則單元506還透過端點HV』ATE控制開關卿 的導，狀悲。當電力開關304被導通，齊納二極體ZM兩 端的崩潰電壓經由電阻R3施加至開關Q27。因此， 關Q27。觸發監測單元5G6可以藉由將端點hv識的^ 壓^拉到〇而關斷開關Q27。在—實施例中，#端點ω 上Uj到電力開關304的關斷操作，觸發 關斷開關Q27,且當端點ακ上於、、則s丨赴a 尤 瓜，則到電力開關304的導 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 14 201236512 通操作，觸發監測單元506就導通開關Q27。 在一實施例中，調光器5〇2包含與觸發監測單元5〇6 麵接、用於對電力開關304的操作進行計數的計數器526， 及與计數器526耦接的數位/類比（j)/A)轉換器528。調 光器502還包括與數位/類比轉換器528耦接的脈衝寬度 調變（PWM)信號產生器530。計數器526由觸發監測單元 506產生的驅動信號所驅動。具體來講，在一實施例中， 备電力開關304關斷，觸發監測單元506在端點〇LK上監 測到一個負緣（negative edge)，並產生一個驅動信號。 。十數盗526的计數值回應該驅動信號被增加（例如加1)。 數位/類比轉換器528從計數器526中讀取計數值，並根 據計數值產生調光信號（例如控制信號538或參考信號 ref)。調光信號可以用來調節電力轉換器31〇的目標電力 值，因而調節LED鏈312的亮度輸出。 在驟變調光模式下，開關540關斷，開關541和542 導通。比較器534的反相輸入端接收參考信號refi，其為 具有預設實質恆定電壓的直流信號。肫打的電壓決^了 LED電流峰值，因此也決定了 LED鏈312的最大亮度輸出。 調光信號可以是施加於脈衝寬度調變信號產生器53〇上的 控制信號538，以調節脈衝寬度調變信號pwM1的責任週 期。透過調節PWM1的責任週期’LED鏈312的亮度可調節 為不大於由REF1所決定的最大亮度。例如，如果pWM1的 責任週期為100% ’則LED鍵312具有最大亮度輸出。如果 PWM1的責任週期小於100%，貝,UED鍵312 &亮度輸出低 於最大亮度輸出。 0781 -TW-CH Spec+Claim(sandra.t-20l20201 ).doc 15 201236512 在類比調光模式下，開關54〇導通，開關541和542 關斷。5周光信號可為具有可調節的電壓的類比參考信號 REF。數位/類比轉換器528根據計數器5邡的計數值調節 REF的電壓。ref的電壓決定了 LED電流峰值，因此也決 定了 LED電流的平均值。因此，透過調節REF，LED鏈312 的亮度輸出可以得到調節。 在一實施例中，數位/類比轉換器528降低REF的電 壓以回應計數值的增加。例如，如果計數值為〇，則數位/ 類比轉換器528調節REF的電壓為V4。如果當觸發監測單 元506在端點CLK監測到電力開關3〇4的關斷操作，計數 值增加到1，則數位/類比轉換器528調節REF的電壓為 V5，且V5小於V4。在另一實施例中，數位/類比轉換器 528增加REF的電壓以回應計數值的增加。 、。 在一實施例中，當計數器526達到其最大計數值後， 計數值被重置為〇。例如，如果計數器526是一個2位元 计數器，計數值將從〇開始依次增加到1、2、3，然後在 第四個關斷操作被監測到後回到〇。據此，LED鏈3丨2的 亮度輸出從第一位準被依次調節到第二位準、第三位準、‘ 第四位準，然後又回到第一位準。 比較器534的反相輸入端可以選擇性地接收參考斤號 REF和參考信號REF1。例如，在類比調光模式下，比較哭 534的反相輸入端經由開關540接收參考信號ref，而在 驟變s周光模式下’比較器534的反相輸入端經由開關Μ! 接收參考信號REF1。比較器534的非反相輸入端經由端點 MON與電阻R5耦接，以接收來自電流感測電阻R5的電流 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 16 201236512 感測信號SEN。電流感測信號SEN的電壓可表示當開關收7 和Q16導通時流經led鏈312的LED電流。 比較器534的輸出端與SR正反器522的[^輸入端耦 接γ Sf正反器522的Q輸出端和及閘524耦接。脈衝寬度 凋交彳5號產生器530產生的脈衝寬度調變信號pwM1施加 至及閘524。及閘524輸出控制信號，經由端點ctrl栌制 控制Q16。 " 如果k擇了類比§周光模式，開關Mo導通，開關“I 和542關斷。開關q16由SR正反器犯2控制。在操作中， 當電力開關304導通，齊納二極體ZD1兩端的崩潰電壓使 得開關Q27導通。回應脈衝信號產生器5〇4產生的脈衝信 號536，SR正反器522在Q輸出端產生數位信號i以導通 控制開關Q16。LED電流流經電感LI、LED鏈312、開關 Q27、控制開關q16、電流感測電阻R5到地。因為電感u 阻止LED電流的突變（sudden change)，LE])電流會逐漸 。因此，電流感測電阻R5兩端的電壓（即電流感測 #唬SEN的電壓）會隨之增大。當SEN的電壓大於參考信 號腳的電壓，比較器534產生數位信號！到SR正反^ 522的R輸入端’以使SR正反器奶產生數位信號〇而關 斷控制開關Q16。控制開關Q16關斷後，電感u放電以對 LED鏈312供電。流經電感u、LED鏈312和二極體的 LED電流逐漸減小。當SR正反器522在s輸入端再度接收 到一個脈衝時，控制開關奶6導通，LED電流再度經由電 流感測電阻R5流到地。當電流感測信號SEN的電壓大於 參考信號REF的電壓，控制開關Q16被SR正反器522關 0781-TW-CH Spec+C] aim(sandra.t-20120201 ).doc 17 201236512 斷。如上述該，參考信號REF決定了流經LED電流的♦值’ =定了 LED㈣2的亮度輪出。藉由調節，⑽鍵 312的焭度輸出得以調節。 nn f圖類Γ周光模式下，如果電力開關304被關斷，電容 "所不）放電以對調光控制器通供電。當觸發 ^測單元_在端點ακ監測到電力開關3Q4的關斷㈣ 時，汁數斋526的計數值加}。回應電力開關3〇4的關斷 操作，觸發監測單元5Q6 _開關Q27。回應計數值的改 變’數位/類比轉換器528把參考信號REF的電壓從第一 位準調節到第二位準。因此，當電力開關3()4導通時，· 鏈312的亮度輸出可根據參考信號的調節而調節。 如果選擇驟變調光模式，開關54〇關斷，開關541和 524導通。比較器534的反相輸入端接收具有預設電壓的 參考信號REF1。控制開關Q16由SR正反器犯2和脈衝寬 度調變信號PWM1二者經由及閘524控制。參考信號REF1 決定了 LED電流的峰值電流，也決定了 LED鏈312的最大 亮度輸出。脈衝寬度調變信號PWM1的責任週期決定了控 制開關Q16的導通/關斷時間。脈衝寬度調變信號pwMi為 邏輯1時，控制開關Q16的導通狀態由SR正反器522的'Q 輸出端決定。當脈衝寬度調變信號PWM1為邏輯〇時，控 制開關Q16關斷。藉由調節脈衝寬度調變信號p聰的責 任週期，可以據此調節LED鏈312的電力。所以，參考信 號REF1和脈衝寬度調變信號pwM1之結合決定Led鏈 的亮度輸出。 在驟變調光模式下，當電力開關3〇4關斷，該關斷操 078 丨-TW-CH Spec+C丨aim(sandra.t-2〇 丨 2〇2〇 1) doc 18 201236512 作在‘點CLK被觸發監測單元506監測到。觸發龄測單元 506關斷Q27並產生驅動信號。回應驅動信號，計數器526 的δ十數值增加（例如加1)。數位/類比轉換器528產生广 制信號538 ’使得脈衝寬度調變信號PWM1的責任週期從^ 一位準調節為第二位準。因此’當電力開關3G4下次導通 時，LED鏈312的亮度輸出將根據由參考信號REn和脈衝 寬度調變信號PWM1所決定的目標亮度輸出進行調節。 圖6所示為類比調光模式下的例示性信號波形圖，其 中包括流經LED鏈312的LED電流602、脈衝信號53/、' 表示SR正反器522輪出的V522、表示及閘524輪出的π% 以及開關Q16的導通/關斷狀態。圖6將結合圖4和圖5 進行描述。 在操作中，脈衝信號產生器504產生脈衝信號536。 回應脈衝信號536的每-個，SR正反器微在㈣出端產 生數位信號卜而在SR正反器522的Q輸出端上的數位 信號1會使得控制開關_導通。當控制開關⑽導通， 電感L1電流斜波上升（rampup)，LED電流6〇2增大。當 LED電流602達到峰值Imax，亦即電流感測信號sen的電 壓與參考信號REF的電壓實質相等時，比較器534產生數 位虎1至SR正反器522的R輸入端，使得SR正反器522 在Q輸出端產生數位信號〇。當紐正反器522 _輸出端 上為數位信號G，控制關_ _。#控制關⑽關 斷電感L1放電為LED鏈312供電，且[ED電流602減 小。在類比調光模式下，藉由調節參考信號REF，LED平 均電流可據此調節，因此LED鏈312的亮度輸出得以調節。 0781 -TW-CH Spec+Claim(sandra.t-2012020] ).d〇c 19 201236512 圖7所示為驟變調光模式下的例示性信號波形圖，其 中包括流經LED鏈312的電流602、脈衝信號536、表示 SR正反器522輸出的V522、表示及閘524輸出的V524、 控制開關Q16的導通/關斷狀態以及脈衝寬度調變信號 PWM1。圖7將結合圖4和圖5進行描述。 當PWM1為數位信號1時，LED電流602、脈衝信號 536、V522、V524和控制開關Q16的導通/關斷狀態之間的 相互關係與圖6相似。當PWM1為數位信號〇時，及閘524 的輸出變為數位信號〇。因此，開關q16關斷而LED電流 602減小。如果卩龍}保持數位信號〇的狀態足夠久，led 電流602會減小到〇。在此驟變調光模式下，藉由調節pwM1 的責任週期，LED平均電流可據此調節，因此LED鏈312 的亮度輸出也得以調節。 圖8所示為根據本發明一實施例闡釋光源驅動電路之 操作示意圖。圖8將結合圖5進行描述。 在圖8所示的實例裡，每當觸發監測單元5〇6監測到 電力開關304的關斷操作，計數器526的計數值就會加卜 計數器526是-個2位元計數n，最大計數值為3。 隹頰比調光模式下 … 将狹态從計數 526中讀取計數值’並回應計數值的增加而降低來考_ 卿的電壓。參考信號_的電壓決定了⑽電流的^ I酿’也決定了 LED平均電流值。在驟變調光模式下，』 ^比轉換器528從計數器526中讀取計數值，細 计數值的增加而降低脈衝寬度調變信號p簡的另 (例如每次調謂)。計數器跳在達到最大計數值(: 0781 _ΤΛν~(：ί·ί Spec+Claim(sandra.卜20 丨 2腳;l.doc 20 201236512 3)後被重置。 方上!：示為根據本發明一實施例的對光源調節電力的 方法&耘圖。圖9將結合圖4和圖5進行描述。 供⑽2中，電力轉換器（如電力轉換器310)提 供的调郎後的電力對光源（如⑽鏈312)進行供電。在 垃你▲中#收開關監測信號（例如由調光控制器308 接收）。該開關監測信號指示耦接於電源和電力 間的電力開關（如電力開關3⑷的操作。在步驟編°中， 根據，關監測信號產生調光信號。在步驟9〇8中，根據該 調光L號4工制與光源串聯叙接的開關（如控制開關⑽）， 以調節來自電力轉換器的調節後電力。在一實施例中 類比調光模式中，藉由比較調光信號和表示光源的光源電 流土小的回授電流感測信號來調節來自電力轉換器的的 週即後電力。在另-實施例中，在驟變調光模式中，藉由 以，調光信號控制-個脈衝寬度調變信號的責任週期來 調蟥來自電力轉換器的的調節後電力。 據此，根據本發明的實施例提供了一種光源驅動電 路’其可根據指示電力開關（如固定在牆上的電力開關） 操作的開關監測信號來調節光源的電力。該光源的電力由 電力轉換器提供，並由調光控制器經由控制與光源串聯耦 接的開關來進行調節。有利之處在於，如先前所述，使用 者可以透過對普通電力開關的操作（如關斷操作）來調節 光源的壳度輸出。因此，無須使用額外的裝置（如外接調 光器或專門設計的具有調光按紐的開關），因此降低成本。 圖10所不為根據本發明一實施例的光源驅動電路 0781-TW-CH Spec+Claim(sandra.t-20120201) d〇c 21 201236512 1000的電路圖。圖.10將結合圖3進行描述。圖1〇中與圖 3及圖4魏姻的^件具有類似的功能。 光源驅動電路1000包括與電源和LED鏈312耦接的 ，力，，器31G’用於接收來自電源的電力並為lED鏈312 提供心後的電力。調光控制器1_藉由監測端點CLK 上的電壓來監測輕接於電源和光源驅動電路之間的 電力開關304的操作。調光控制器1()()8接收指示電力開 關304,第-複數個操作之調光請求信號和指示電力開關 304的第一複數個操作之調光終止信號。調光控制器1議 左由，點GLK接㈣光請求信號和調光終止錢。如果接 收到调光請求錢’調光控制^麵還可連續調節來自 電力轉換器310的調節後電力，且如果接收到調光終止信 號，停止調節來自電力轉換器31G的調節後電力。換言之， 一旦監測到電力開關304的第一複數個操作，調光控制哭 1〇〇8連續調節來自電力轉換器31G的調節後電力，直到: 測到電力開關綱的第二複數個操作。在一實施例中^ 光控制器1_藉由控制與LED鏈312串聯減的控制開 關Q16來調節來自電力轉換器31〇的調節後電力。 圖11所示為根據本發明一實施例圖10中的調光控制 器1008的例示性架構圖。圖丨丨將結合圖1〇進行描述。 圖11中與圖4、圖5及圖1Q編號相同的元件具有^似的 功能。 、 在圖11的實例中，調光控制器1008的架構盥圖5中 調光控制器308的架構類似。不同之處在於調光器@ 11〇2 和觸發監測單元1106。在圖Π中，觸發監測單元li〇6經 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 22 201236512 由端點ακ減賊财信私調祕止錢 號μ來致能絲能咖產㈡⑽⑽ 還控制與⑽鏈312叙接的開關卿的導通狀i 來調光器1102產生參考信號REF 來调即LED鏈312的電力，或在驟變調光模式下 =02產生控制^虎538來調節脈衝寬度調變信號膽的 二任週期’以調節LE_312的電力。在圖u的實例中， 调光器1102包括與觸發監測單元11()6純的用於產生時 脈信號的時脈產生器_、由時脈信號驅動的計數器 1126 ’以及與計數器1126祕的數位/類比（d/a)轉換 器巧。調光器1102還進一步包括與數位/類比（d/a)轉 換益528耦接的脈衝寬度調變（pwM)信號產生器53〇。 一在操作中，當電力開關304導通或關斷，觸發監測單 元1106能夠在端點CLK分別監測到電壓正緣或負緣。例 如’當電力開關304關斷，電容ci〇放電為調光控制器11〇8 供電。電阻R6兩端的電壓下降到〇。因此，觸發監測單元 1106可以在端點CLK上監測到一個電壓負緣。類似的，當 電力開關304導通，電阻R6兩端的電壓上升至—個預設 的電壓。因此，觸發監測單元11〇6可以在端點clk上監 測到一個電壓正緣。如前所述，藉由監測端點CLK上的電 壓，觸發監測單元1106可以監測到電力開關304的操作， 如導通操作或關斷操作。 在一實施例中，當電力開關304的第一複數個操作被 監测到時，觸發監測單元1106經由端點CLK接收到調光 °月求彳5说。當電力開關304的苐一複數個操作被監測到 0781 TW-CH Spec+Claim(sandra.t-20l20201),doc 23 201236512 時’觸發監測單元1106經由端點CLK接收到調光終止信 =在-實施例中，電力開關3G4的第―複數個操作包^ 第-關斷操作和其後的第一導通操作。在—實施例令，電 力開關304的第二複數個操作包括第二關斷操作和 第一導通操作。 ^果觸發監測單元1106接收到調光請求信號，調光 控制盗1108開始連續調節來自電力轉換器31()的調節後 電力。在類比調光模式下，調光控制器11〇8調節參考信 號REF的電壓以調節來自電力轉換器31〇的調節後電力。。 f驟變調光模式下，調光控制H丨應調節脈衝寬度調變 信號PWM1的責任週期以調節來自電力轉換器的調 後電力。 如果觸發監測單元1106接收到調光終止信號，調光 控制器1108停止調節來自電力轉換器31〇的調節後電力。 圖12所示為根據本發明一實施例的包括圖丨丨中的調 光控制器1108之光源驅動電路的操作示意圖。圖12將結 合圖10以及圖11進行描述。 假設初始時刻電力開關304關斷。在操作中，在—實 施例中，當電力開關304被使用者導通，LED鏈312由來 自電力轉換器310的調節後電力供電，產生一個初始亮度 輸出。在類比調光模式下，該初始亮度輸出由參考信號 的初始電壓決定。在驟變調光模式下，該初始亮度輸出由 脈衝寬度調變信號PWM1的初始責任週期（如：1〇〇%)決 疋。在一實施例中’參考信號REF和脈衝寬度調變信號pw叽 由數位/類比（D/A)轉換器528根據計數器1126的計數 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 24 201236512 和;;：初始〜由 加二者可以對電力開關 -複數個操作’產生調光請求開關3〇4的第 :數:操:包括第一關斷操作;二的;= 此一來，觸發監測單元11〇6在端點 麵作。如 含電壓負緣1204和其後的正緣=到包 應調光請求信號，觸發監測單元⑽ 丫。回 EN信號。因此’致能時脈產生器⑽以產的 由時脈信號驅動的計數器1126可回應時脈信號==時 脈脈衝而改變計數值。在圖12的實财，計數值 脈仏號而增加。在-實施例中，當計數器1126達:音 設的最大計數值後，計數值被重置為Q。在另—實施例中， 計數值增加直到計數H 1126物賴最大計數值，然後 計數值減少直到計數器1126達到預設最小計數值。…、 在類比調米模式下，數位/類比（D/A)轉換器528從 計數器1126中讀料數值，並回應於計數值的增加而降 低參考信號REF的電壓。在驟變調光模式下，數位/類比 (D/A)轉換器528從計數器U26中讀取計數值，並回應 計數值的增加而降低脈衝寬度調變信號PWM1的責任週期 (例如每次降低10%)。據此，因為來自電力轉換器310的 調節後電力是由參考信號REF的電壓決定（在類比調光模 式下）或是由脈衝寬度調變信號PWM1的責任週期決定（驟 在變調光模式下）’所以LED鏈312的亮度可以調節。 0781-TW-CH Spec+Claim(sandra.t-20120201).doc 25 201236512 到期望的⑦度輸出，使用者藉由對電力開關 304加加第二複數個操作來終止亮度…旦監測到第二複 數個操作’產生調光終止信號。在—實施例中，第二複數 ，作包，二關_作和其後的第二導通操作。如此一 :9n«觸心甘皿測單凡1106在端點CLK監測到包含電壓負緣 1208和，、後的正緣⑽之觀終止信號。_到貞測到調 光終止信號’觸發監測單元1⑽產生具有低位準的EN信 號口此除月bB寺脈產生器11〇4,以使得計數器Η%保 持其片數值只。據此’在舰調光模式下，參考信號㈣ 的電壓將鋪在敏的轉。在驟變調光模式下，脈衝寬 度调變MPWM1的責任週期將保持為期望值。因此，㈣ 鏈312的&度輸出將轉為期望的亮度輸出。 圖13所不為根據本發明一實施例的調節一光源的電 力的方法流程圖13〇〇。圖13將結合圖1〇以及圖u進 描述。 在步驟1302中，以來自電力轉換器（如電力轉換器 310)的調節後的電力對光源（如LED鏈312)進行供電 在步驟1304中’接收調光請求信號（如由調光控制 态1108接收）。該調光請求信號指示耦接於該電源和該電 力轉換器之間的電力開關（如電力開關3〇4)的第—複數 個操作。在一實施例中，電力開關的第一複數個操作包括 第一關斷操作和其後的第一導通操作。 在步驟1306中，連續調節來自電力轉換器的調節後 的電力（如利用調光控制器1108進行調節）。在—實施例 中，致能時脈產生器1104來驅動計數器1126。根據計數 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 26 201236512 器1126的計數值產生調光信號（如 信號REF)。在類β 唬538或參考 指干⑽IT 式藉由比較參考信細和 自該電力轉換哭的，節德感測信號來調節來 —^ 即後電力。REF的電壓由計數值決 二變調光模式下’藉由控制信號咖改變脈、 期以調節來自該電力轉換器的; WM1的貝任週期由計數值決定。 器= = 止信號(如由調光控制 力轉換器之間的ϋ門關接於該電源和該電 第:rr，j中，電力開關的第二複數個操作包括 第一關斷刼作和其後的第二導通操作。 131G中’如果接收到調光終止信號，則停止 ^來自該電力轉換器的調節後電力。在—實施例中，除 ΐ日。，11G4以使得計數111126保持其計數值不 , / ，在類比調光模式下，參考信號REF的電壓 铲Pwt期望的位準。在驟變調光模式下，脈衝寬度調變信 的餘職將簡為鮮值。因此 期望的亮度輸出。 于 圖4A所示為根據本發明一實施例光源驅動電路14〇〇 if路圖。圖14A中與圖3、圖4及圖10編號相同的元件 ”有類似的功能。圖14A將結合圖4進行描述。 光源驅動電路14 0 0透過電源開關丨4 〇 4連接到電n (如110/一 120伏交流電，6〇赫兹），並與光源1412搞接。 θ 14B所不為根據本發明一個實施例的圖14a中的電源開 〇781-TW-CHSpec+Claim(sandra.t-2〇i2〇2〇l).d〇c 27 201236512 關1404的圖不。在一實施例中，電源開關腿為置於牆 上的0N/0FF開關。透過切換按叙丨彻至⑽或哪的位 置（如由使用者切換）可控制電源f· 14G4的閉合或斷 開。 。如圖14A所不’光源驅動電路14GQ包括交流/直流轉 換器306、轉換益141〇和調光控制器14〇8。交流/直流轉 ，器306將交流輸入電壓V【N轉換成直流輸出電壓v_。與 父流/直流轉換器306輕接的轉換器141〇接收直流輸出電 壓V，，為光源體提供輪出電能。與交流/直流轉換器 306和轉換益1410耦接的調光控制器14〇8監測電源開關 1404，並根據電源開關1404的動作以調節轉換器141〇的 輸出電能’進而控制光源1412發出的光的顏色和亮度。 在-實施例中，調光控制器廟包括多個端點，如端點 HV、端點CLK、端點VDD、端點GND、端點CTRL1、端點Μ0Ν1、 端點CTRL2和端點Μ0Ν2。 在一個實施例中，光源1412包括多個LED光源，如 光源LED1和光源LED2。為方便說明，圖.所示的光源 LED1包括一個LED鏈，光源LED2包括一個LED鏈。或者 光源LED1和光源LED2的每一個都包括多條LED鏈。光源 LED1能夠發出第一種顏色光（如暖色光源LED2能夠發 出第二種顏色光（如冷色）。因此透過控制光源LED1和光 源LED2，光源1412能夠發出不同顏色的光。 在一個實施例中，轉換器1410包括分別與光源[EDI 和LED2搞接的電力轉換器1414和1416。電力轉換器1414 為包括電感L29、二極體D25、電容C26、電阻R23和開關 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 28 201236512 Q21的降壓轉換器。開關Q21與光源腦串聯。開關控制 1號1450 (如脈衝寬度調變號）控制開關⑽的閉 &或斷開。類似地，電力轉換器㈣也可以是包括電感 L30、;極體D28、電容C27、電阻以3和開關⑽的降壓 換裔。開關控制信號1452 (如脈衝寬度調變pWM信號） 控制與光源LED2串聯的控制開關⑽的閉合或斷開。電 力轉換器1414和1416還可以具有其他結構，並不限 14A中的例子。 與電力轉換器310 (如圖4所示）的操作類似，電力 轉換器1414根據開關Q21的導通狀態將調節後的電能提 供給光源LED1。更具體地說，在—個實施例中，開關⑽ ，合或者⑽交替閉合和斷開（即“開燈”狀態），以使 付電流流過光源led卜電力轉換器1414可工作於驟變調 光模式或類比調光模式來調整調節後的電能。舉例來說， 在驟變調光模式下’調節開關控制信號·的責任週期， 以調節供給錢LED1的電能。在齡調光模式下，根據 開關控制信號1450透過調節光源LED1的電流峰值，以調 節供給光源LED1的電能。 此外，如果開關Q21斷開且斷開狀態的持續時間超過 一個時間臨限值（即“關燈”狀態），透過光源以讥的電 流則降到零安培，因此關斷光源LED1。電力轉換器1416 的操作類似於電力轉換器1414。 基於開關控制信號1450和1452,轉換器1410選擇性 地將調節後的電能提供給光源LED1和LED2。在一個實施 例中，開關Q21和Q31其中一個處於開燈狀態，為對應的 0781-TW-CH Spec+Claim(sandra.t-20120201).doc 29 201236512 光源LED1或LED2供電，另一個處於關燈狀態的開關關斷 對應的光源LED1或LED2。舉例來說，當供電給ledi (如 暖色白LED鏈）且關斷LED2 (如冷色白LED鏈）時，光 1412發出具有暖色溫度的光。同樣地，當關斷且供 電給LED2時，光源1412發出冷色溫度的光。 因此，透過調節供給光源1412的電能（如透過調節 開關控制信號1450和1452) ’光源1412的顏色和亮度都 得到控制。 調光控制器1408監測電源開關1404的動作，並據此 產生對應的開關控制信號1450和1452。當電源開關1404 接通，與交流/直流轉換器306耦接的端點HV從電源Vin 接收電能’並為調光控制器1408供電。在一個實施例中Y 當電源開關1404斷開，與端點VDD耦接的電能儲存單元 (如電容C24)能夠為調光控制器14〇8供電。端點G_與 地耦接。 在一個實施例中，端點MON1與電阻R23耦接，監測 透過光源LED1的電流。同樣地，端點與電阻R33轉 接，監測透過光源LED2的電流。 在圖14A所示的例子中，調光控制器14〇8透過監測 與父流/直流轉換器3 0 6搞接的端點CLK的電壓來監測電 源開關1404。透過端點CLK，調光控制器1408接收指示 電源開關1404的第一組動作的顏色改變信號、接收指示 電源開關1404第二組動作的調光請求信號、以及接收指 示電源開關1404苐二組動作的調光終止信號。根據端點 CLK接收到的信號’調光控制器14〇8產生開關控制信號 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 30 201236512 1450和1452來分別控制開關Q21和Q31。No. to control the electric energy, A control signals determine that the - color and - brightness of the source 2 indicate the f monitoring signal by the multi-identification, and indicate the electric__ color change signal signal, and the dimming controller adjusts the When a plurality of control light controllers adjust the plurality of control numbers, the invention also solves the "degree. A converter transmission method includes: - the power from the - power switch; a power source and a converter indicating a first switch of the power switch - the first: = change signal, the color change signal aligns a color of the light source. and ▲, according to the color change signal, the number indicates the power switch -= -2 = seeking (four) 'the dimming request signal adjusts the action of the light source, and according to the dimming request. [Embodiment] will be described as follows: ==; =: Shi: gives a detailed description. Although the present invention is limited to These embodiments. Phase two does not mean that the present invention will be issued: two == this two =:=::, in order to provide for the technique: the general knowledge in r will be: body: this f: body: That is, the present invention can be implemented as well. In addition, some examples/pairs of 0781-TW-CH Spec+Claim (sandra.t-2) 0120201 ).doc 6 201236512 The methods, programs, components and circuits that are well known are not described in detail in order to highlight the gist of the present invention. Fig. 3 is not a block of a light source driving circuit 3 according to the present invention. In an embodiment, the light source driving circuit 300 includes a current/direct current (AC/DC) converter 3〇6 for converting a power supply voltage Vin from a power source to a DC output voltage v〇ut. A power switch 304 for selectively connecting the power source to the light source driving circuit 300 between the power source and the AC/straight converter 306 is coupled to the AC/DC converter 3〇6 for providing adjustment for the LED chain 312 The post-electric power converter 31A is coupled to the power conversion thief 310 for receiving a switch monitoring signal indicating the operation of the power switch 3〇4, and adjusting the dimming controller from the power converter adjusted power according to the switch monitoring signal 308, and a current sensor 314 for monitoring the led current flowing through the 1?1) chain 312. In one embodiment, the power switch 304 is an on/off (〇n/〇ff) switch that is secured to the wall. In operation, AC/DC converter 306 converts input AC voltage Vin to DC output voltage Vout. Power converter 310 receives DC voltage Vout and provides regulated power to LED chain 312. Current sensor 314 produces a current sense signal indicative of the LED current level flowing through Led chain 312. The dimming controller 308 monitors the operation of the power switch 304, receives the current sense signal from the current sensor 314, and controls the power converter 310 in response to operation of the power switch 3〇4 to regulate the power of the LED chain 312. In one embodiment, the dimming controller 308 operates in an analog (anal) g dimming mode 'transmission adjustment' to indicate the current peak (four) reference wire adjustment key 312 power. In another embodiment, the dimming controller 3〇8 operates in a burst dimming mode by adjusting a pulse width modulation (pwM) 0781 - TW-CH Spec+Claim (sandra.t-20120201) .doc 7 201236512 h number of the Bayesian cycle to regulate the power of the LED chain 312. By adjusting the power of the LED chain 312, the luminance output of the LED chain 312 can be adjusted accordingly. 4 is a circuit diagram of a light source driving circuit 4A according to an embodiment of the present invention. Figure 4 will be described in conjunction with Figure 3. Elements in Figure 4 that are numbered the same as in Figure 3 have similar functions and will not be repeatedly described herein for the sake of brevity. Light source drive circuit 400 includes a power converter 31 ("not shown in Figure 3") coupled to a power source and LED chain 312 for receiving power from a power source and providing regulated power to LED chain 312. In the example of FIG. 4, power converter 310 can be a buck converter that includes an inductor li, a diode 4), and a control switch Q16. In the embodiment shown in Figure 4, control switch Q16 is located outside of dimming controller 308. In other embodiments, the control switch Q16 can be integrated into the dimming controller 3〇8. The dimming controller 308 receives a switch monitoring "表示" indicating the operation of the power switch (eg, the power switch 3Q4 coupled between the power source and the light source driving circuit), and controls the control coupled in series with the lED chain 312 according to the switch monitoring signal. The switch (10)' regulates the regulated power from the power transfer 31Q (including the inductor L1, the diode D4, and the control switch Q16). The light source driving circuit 400 further includes an AC/DC converter 3〇6 for inputting the AC input. The voltage Vin is converted to a DC output voltage v〇ut, and a current sensor 314 for monitoring the current flowing through the LED chain 312. In the example shown in Figure 4, the AC/DC converter 3〇6 can be included The bridge rectifier of the diodes M, D2, D7, D8, D10 and capacitor C9. The current sensor 314 can include a current detecting resistor R5. In her usual example, the endpoints of the dimming controller 308 include: HV_GATE , SEL, CLK, RT, VDD, CTRL, MON, and GND. Endpoint 0781 - TW-CH Spec+Claim (sandra.t-20120201 ), doc 8 201236512 HV-GATE is coupled to switch Q27 via resistor R3 for Controlling the conduction state of the switch Q27 coupled to the LED chain 312 ( Such as the on/off state. The electrical coupling C11 is coupled between the terminal hv and GATE and the ground to adjust the gate voltage of the switch to receive 7. The user can choose to connect the terminal SEL via the resistor R4. To ground (as shown in Figure 4) or connect the endpoint SEL directly to ground, select a dimming mode 'such as analog dimming mode or sudden dimming mode. Endpoint CLK is coupled to AC/DC conversion via resistor R3 The device 3〇6 is coupled to ground via a resistor R6. The terminal CLK receives a switch monitoring signal indicative of the operation of the power switch 304. In one embodiment, the switch monitors a common node between the resistor R3 and the resistor R6. (c〇mm〇nn〇de) is generated. Capacitor C12 is coupled in parallel with resistor R6 for filtering undesired noise. Endpoint RT is coupled to ground via a resistor for determining by dimming controller 308 The frequency of the generated pulse signal. The terminal VDD is coupled to the switch Q27 via the diode !) 9 for the tuning, the controller 308 #电. In the implementation of the -, energy unit (such as the current C10) coupling Connected between the terminal VDD and ground, when the power switch is off, it is dimming control In another embodiment, the energy unit is integrated inside the dimming controller 308. The terminal GND is coupled to the ground. The terminal CTRL is coupled to the control switch qi6. The control switch is 6 with the LED chain 312 and the switch Q27. Coupled in series and coupled to ground via current sense resistor R5. Dimming controller 308 controls the conduction state (eg, on and off states) of control switch Q16 using control signals via endpoint CTRL to regulate the force from f Convert the regulated power of the H 31G. The terminal M (10) is coupled to the current sensing resistor R5 for receiving the LE representing the current flowing through the LED chain 312.) 0781 - TW-CH Spec + CIaim (sandra.t-20120201 ).doc 9 201236512 Current sensing signal . When switch Q27 is turned on, dimming controller 308 regulates the LED current flowing through LED chain 312 by controlling control switch Q16. In operation, when the power switch 304 is turned on, the AC/DC converter 306 converts the input AC voltage Vin into a DC output voltage V〇ut. The preset voltage on the terminal HV_GATE is applied to the switch Q2? via the resistor R3 to turn on the switch Q27. If dimming controller 308 turns on control switch Q16, DC voltage Vout will power LED chain 312 and charge inductor L1. The LED current flows through inductor LI, LED chain 312, switch Q27, control switch Q16, and resistor R5 to ground. If the dimming controller 308 turns off the control switch Q16, the LED current flows through the inductor LI, the LED chain 312, and the diode D4. The electric salt L1 discharges to power the LED chain 312. Therefore, the dimming controller 308 can adjust the regulated power from the power converter 31A by controlling the control switch Q16. When the power switch 304 is turned off, the capacitor C1 〇 is discharged to supply power to the dimming controller 308. The voltage across resistor R6 drops to 〇, so a switch monitor signal indicating that power switch 304 is turned off can be monitored by dimming controller 308 via endpoint CLK. Similarly, when the power switch 3〇4 is turned on, the voltage across the resistor R6 rises to a predetermined voltage value, so a switch monitor signal indicating that the power switch 3G4 is turned on can be monitored by the dimming controller 308 via the terminal ακ. If the shutdown operation is detected, the dimming control cries 3〇8 can be powered down by pulling the voltage on the terminal HV-GATE to 〇 'Q27, so that the key 31 is discharged after the inductor u is discharged. In response to the shutdown operation, the dimming controller 3〇8 adjusts a reference signal indicative of the desired luminance output of the chain. Therefore, when the power switch is 4 next time 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).d < 10 201236512 On-time' The LED key 312 can generate a luminance output based on the adjusted desired luminance output. In other words, the LED chain 3 can be adjusted in such a way that the luminance output can be responded to by the dimming controller 308 in response to the power switch 3Q4. FIG. 5 is not an exemplary architectural diagram of the dimming controller 308 of FIG. 4 in accordance with an embodiment of the present invention. Figure 5 will be described in conjunction with Figure 4. Figure 2 The components numbered the same as in Figure 4 have similar functions, and the description will not be repeated here for the sake of brevity. The dimming controller 308 includes a trigger monitoring unit 5〇6, a dimmer 5〇2, and a pulse signal generator 5G4. The trigger monitoring unit _ is connected to ground via Zener diode ZD1. The trigger monitoring unit 5〇6 receives a switch monitoring signal indicating the operation of the external power switch 304 via the terminal ακ, and generates a drive signal to drive the counter 526 when the operation of the external power switch 304 is detected at the terminal CLK. The trigger monitoring unit 5〇6 further controls the conduction state of the switch Q27. The dimmer 5〇2 generates a reference signal pin, adjusts the power of the LED chain 312 in an analog to dimming mode, or generates a control signal 538 that adjusts the duty cycle of the pulse width modulation signal to adjust the power of the LED chain 312. The pulse signal generator 5〇4 generates a pulse signal which turns on the control switch Q16. The dimming controller 308 further includes an Under Voltage Lockout (UVL) circuit 508 coupled to the terminal VJ) D for selectively turning on the dimming controller 3 according to the non-power condition. 8 one or more components inside. In one embodiment, the startup and undervoltage lockout (4) 5〇8 will turn on all of the components in the dimming controller 3〇8 when the voltage at the terminal VDD is above the first predetermined voltage. When the power switch 304 is turned off, if the voltage at the terminal VDD is lower than the second predetermined voltage, the start and under voltage lockout circuit 5 (10) will be turned off 0781 - TW-CH Spec + Claim (sandra. T-20120201 ). Doc 11 201236512 Closed dimming controller 3G8 saves energy by triggering the monitoring list (10) 6 and dimming crying 5〇2 components. When the voltage on the terminal TM is lower than the second page = voltage 'start and undershoot circuit _ will turn off the touch and dimmer 5 〇 2. In the embodiment, the first preset, [South to the second preset voltage], the second preset voltage is higher than the third preset voltage. Since the dimming controller 308 can be powered by the capacitor (10) via the terminal, the trigger monitoring unit 5〇6 and the dimmer 502 can operate for a period of time even after the power switch 304 is turned off. In dimming control 1 308, the endpoint SEL and the current source are decremented. The user can configure the endpoint SEL (for example, by connecting the endpoint fox directly to the ground plane or by coupling the endpoint SEL to the ground via a resistor). In the embodiment t, the dimming mode is determined by measuring == voltage. If the endpoint SEL is directly at a lighter voltage than ground, it is approximately 〇. a control circuit (not shown; off 540, switches 541 and 542 are turned off. Therefore, the dimming controller can operate in the class-light mode and adjust the power of the LED chain 312 by adjusting the reference signal. In one embodiment, if the endpoint fox is coupled to ground via a resistor R4 having a predetermined resistance (as shown in Figure 4), the voltage at the terminal SEL is greater than 〇. The control circuit is sequentially turned off. The switch 540, the turn-on switch 541, and the turn-on switch 542. Therefore, the dimming controller 308 operates in the sudden dimming mode and adjusts the power of the LED chain 312 by adjusting the duty cycle of the pulse width modulation signal PWM1. In other words, via U The conduction states of the switches 540, 541, and 542 can be controlled to select different dimming modes, and the conduction states of the switches 540, 541, and 542 are determined by the voltage at the terminals. 0781-TW-CH Spec+Claim(sandra. T-20120201 ). Doc \2 201236512 Pulse signal generator 504 is coupled to ground via terminal RT and resistor R7 to generate pulse signal 536 for turning on switch Q16. The pulse signal generator 504 can have a different configuration and is not limited to the configuration shown in FIG. In the pulse signal generator 504, the non-inverting input of the operational amplifier 510 receives the preset voltage VI. Therefore, the inverting input voltage of the operational amplifier 510 is also VI. The current Irt flows to ground through the terminal RT and the resistor R7. The current h flowing through the metal oxide semiconductor field effect transistor (MOSFET) 514 and the MOSFET 515 is equal to the current IRT. Since MOSFE1T 514 and MOSFET 512 form a current mirror, the current h flowing through MOSFE1T512 is also equal to current IRT. The output of comparator 516 and the output of comparator 518 are coupled to the S input and R input of SR flip flop 520, respectively. The inverting input of comparator 516 receives a preset voltage V2. The non-inverting input of comparator 518 receives a preset voltage V3. In an embodiment, V2 is greater than V3 and V3 is greater than zero. Capacitor C4 is coupled between MOSFET 512 and ground and has a common node coupled to the non-inverting input of comparator 516 and the inverting input of comparator 518. The Q output of the SR flip-flop 520 is coupled to the S input of the switch Q15 and the SR flip-flop 522. Switch Q15 is connected in parallel with capacitor C4. The on state of switch Q15 (eg, on/off) is determined by the Q output of SR flip-flop 520. The initial voltage across capacitor C4 is approximately 〇, less than V3. Therefore, the R input of the SR flip-flop 520 receives the digital signal 1 output by the comparator 518. The Q output of the SR flip-flop 520 is set to a digital signal 〇, which is turned off and off Q15. When switch Q15 is turned off, as capacitor C4 is charged by current 12, the voltage across capacitor C4 rises. When the voltage across the capacitor C4 is greater than V2, the S input of the SR flip-flop 520 receives the digital signal 1 output by the comparator 516. 0781 -TW-CH Spec-f-CIaim(sandra. T-20120201 ). Doc 13 201236512 The Q output of the SR forward and reverse 520 is set to a digital signal, which turns off Q15. When the switch Q15 is turned on, the voltage across the capacitor C4 decreases as the capacitor C4 is discharged via the switch. When the voltage across capacitor C4 drops below V3, comparator 518 outputs a digital signal 丨, and the "output" of SR flip-flop 52 is set to a digital signal 〇, which turns off switch Q15. Capacitor C4 is then charged by current 12. Thus, via the above process, the pulse signal generator 504 generates a pulse signal 536 that includes a series of pulses at the q-round of the SR flip-flop 52A. Pulse signal 536 is passed to the S input of flip-flop 522. ° . The trigger monitor S 506 monitors the operation of the power switch class through the terminal ακ, and when the operation of the power switch 304 is detected at the terminal CLK, a drive signal is generated to count H 526. In an embodiment, when the power switch 304 is turned "on", the voltage at the terminal CLKJ^ rises to a level equal to the voltage across the power (shown in Figure 4). # power switch 3〇4 is turned off, the voltage on the terminal CLK drops to 〇. In this case, the switch monitor number indicating the power switch profile can be monitored at the endpoint. In an embodiment, when the terminal _ is still occupied by the endpoint α κ, the triggering monitoring unit 506 generates a drive signal. The triggering unit 506 also controls the switch of the switch through the endpoint HV ATE, which is sad. When the power switch 304 is turned on, the breakdown voltage at both ends of the Zener diode ZM is applied to the switch Q27 via the resistor R3. Therefore, turn off Q27. The trigger monitoring unit 5G6 can turn off the switch Q27 by pulling the voltage of the endpoint hv to 〇. In the embodiment, the shutdown operation of Uj to the power switch 304 on the #terminal ω, triggers the shutdown switch Q27, and when the endpoint ακ is on, then s丨 goes to a 尤瓜, then to the power switch 304 Guide 0781 -TW-CH Spec+Claim(sandra. T-20120201 ). Doc 14 201236512 Through operation, the trigger monitoring unit 506 turns on the switch Q27. In one embodiment, the dimmer 5〇2 includes a counter 526 that interfaces with the trigger monitoring unit 5〇6 for counting the operation of the power switch 304, and a digital/analog coupled to the counter 526 ( j) / A) Converter 528. The dimmer 502 also includes a pulse width modulation (PWM) signal generator 530 coupled to the digital/analog converter 528. Counter 526 is driven by a drive signal generated by trigger monitoring unit 506. Specifically, in one embodiment, the standby power switch 304 is turned off and the trigger monitoring unit 506 monitors a negative edge at the endpoint 〇LK and generates a drive signal. . The count value of the dozens of thieves 526 should be increased by the drive signal (for example, by one). The digit/analog converter 528 reads the count value from the counter 526 and generates a dimming signal (e.g., control signal 538 or reference signal ref) based on the count value. The dimming signal can be used to adjust the target power value of the power converter 31, thus adjusting the luminance output of the LED chain 312. In the sudden dimming mode, switch 540 is turned off and switches 541 and 542 are turned on. The inverting input of comparator 534 receives a reference signal refi which is a DC signal having a predetermined substantially constant voltage. The voltage of the beating determines the peak value of the LED current, thus also determining the maximum brightness output of the LED chain 312. The dimming signal may be a control signal 538 applied to the pulse width modulation signal generator 53A to adjust the duty cycle of the pulse width modulation signal pwM1. By adjusting the duty cycle of PWM1, the brightness of LED chain 312 can be adjusted to be no greater than the maximum brightness determined by REF1. For example, if the duty cycle of pWM1 is 100% ', then LED key 312 has the maximum brightness output. If the duty cycle of PWM1 is less than 100%, the UED key 312 & luminance output is lower than the maximum luminance output. 0781 -TW-CH Spec+Claim(sandra. T-20l20201 ). Doc 15 201236512 In analog dimming mode, switch 54 is turned on and switches 541 and 542 are turned off. The 5 week light signal can be an analog reference signal REF with an adjustable voltage. The digital/analog converter 528 adjusts the voltage of REF based on the count value of the counter 5邡. The voltage of ref determines the peak value of the LED current and therefore the average value of the LED current. Therefore, by adjusting REF, the luminance output of LED chain 312 can be adjusted. In one embodiment, the digital/analog converter 528 lowers the voltage of REF in response to an increase in the count value. For example, if the count value is 〇, the digital/analog converter 528 adjusts the voltage of REF to V4. If the count value increases to 1 when the trigger monitoring unit 506 detects the turn-off operation of the power switch 3〇4 at the terminal CLK, the digital/analog converter 528 adjusts the voltage of REF to V5 and V5 is less than V4. In another embodiment, the digital/analog converter 528 increases the voltage of REF in response to an increase in the count value. ,. In one embodiment, the counter value is reset to 当 when the counter 526 reaches its maximum count value. For example, if the counter 526 is a 2-bit counter, the count value will be incremented from 〇 to 1, 2, 3, and then returned to 〇 after the fourth shutdown operation is monitored. Accordingly, the luminance output of the LED chain 3丨2 is sequentially adjusted from the first level to the second level, the third level, the ‘fourth level, and then back to the first level. The inverting input of comparator 534 can selectively receive reference REF and reference signal REF1. For example, in the analog dimming mode, the inverting input of the comparison cry 534 receives the reference signal ref via the switch 540, and in the sudden change s ambient mode, the inverting input of the comparator 534 receives the reference signal via the switch Μ! REF1. The non-inverting input of comparator 534 is coupled to resistor R5 via terminal MON to receive current from current sense resistor R5 0781 - TW-CH Spec + Claim (sandra. T-20120201 ). Doc 16 201236512 Sensing signal SEN. The voltage of the current sense signal SEN may represent the LED current flowing through the LED chain 312 when the switches 7 and Q16 are turned on. The output of comparator 534 is coupled to the Q output of γ Sf flip-flop 522 and to gate 524 of the [^ input of SR flip-flop 522. Pulse width The pulse width modulation signal pwM1 generated by the 彳5 generator 530 is applied to the AND gate 524. The gate 524 outputs a control signal, which is controlled by the terminal ctrl to control Q16. " If k selects the analog § Zhouguang mode, the switch Mo is turned on, the switch "I and 542 are turned off. The switch q16 is controlled by the SR flip-flop 2. In operation, when the power switch 304 is turned on, the Zener diode The breakdown voltage across ZD1 causes switch Q27 to conduct. In response to pulse signal 536 generated by pulse signal generator 5〇4, SR flip-flop 522 generates digital signal i at the Q output to turn on control switch Q16. LED current flows through inductor LI, LED chain 312, switch Q27, control switch q16, current sense resistor R5 to ground. Because inductor u prevents the sudden change of LED current, LE]) current will gradually. Therefore, the voltage across current sense resistor R5 ( That is, the voltage of the current sense #唬SEN will increase accordingly. When the voltage of SEN is greater than the voltage of the reference signal pin, the comparator 534 generates a digital signal! to the R input terminal of the SR positive and negative ^ 522 to make the SR positive and negative The milk generates a digital signal and turns off the control switch Q16. After the control switch Q16 is turned off, the inductor u discharges to supply power to the LED chain 312. The LED current flowing through the inductor u, the LED chain 312, and the diode is gradually reduced. SR flip-flop 522 receives again at the s input When one pulse is passed, the control switch milk 6 is turned on, and the LED current flows to the ground again via the current sensing resistor R5. When the voltage of the current sensing signal SEN is greater than the voltage of the reference signal REF, the control switch Q16 is turned off by the SR flip-flop 522 0871- TW-CH Spec+C] aim(sandra. T-20120201 ). Doc 17 201236512 Broken. As described above, the reference signal REF determines the value of ♦ passing through the LED current' = the brightness of the LED (4) 2 is turned on. By adjusting, the twist output of the (10) key 312 is adjusted. In the nnf diagram, in the peripheral mode, if the power switch 304 is turned off, the capacitor is not discharged to supply power to the dimming controller. When the trigger unit _ is detected at the end point ακ to turn off the power switch 3Q4 (4), the count value of the juice number 529 is added. In response to the shutdown operation of the power switch 3〇4, the monitoring unit 5Q6_switch Q27 is triggered. The response to the change in the count value 'digital/analog converter 528 adjusts the voltage of the reference signal REF from the first level to the second level. Therefore, when the power switch 3() 4 is turned on, the luminance output of the chain 312 can be adjusted according to the adjustment of the reference signal. If the sudden dimming mode is selected, the switch 54 is turned off and the switches 541 and 524 are turned on. The inverting input of comparator 534 receives a reference signal REF1 having a predetermined voltage. The control switch Q16 is controlled by both the SR flip-flop 2 and the pulse width modulation signal PWM1 via the AND gate 524. The reference signal REF1 determines the peak current of the LED current and also determines the maximum brightness output of the LED chain 312. The duty cycle of the pulse width modulation signal PWM1 determines the on/off time of the control switch Q16. When the pulse width modulation signal pwMi is logic 1, the conduction state of the control switch Q16 is determined by the 'Q output terminal of the SR flip-flop 522. When the pulse width modulation signal PWM1 is logic ,, the control switch Q16 is turned off. The power of the LED chain 312 can be adjusted accordingly by adjusting the duty cycle of the pulse width modulation signal p. Therefore, the combination of the reference signal REF1 and the pulse width modulation signal pwM1 determines the luminance output of the Led chain. In the sudden dimming mode, when the power switch 3〇4 is turned off, the shutdown operation 078 丨-TW-CH Spec+C丨aim(sandra. T-2〇 丨 2〇2〇 1) doc 18 201236512 The POINT CLK is triggered by the monitoring unit 506. The trigger ageing unit 506 turns off Q27 and generates a drive signal. In response to the drive signal, the delta value of counter 526 is incremented (e.g., incremented by one). The digital/analog converter 528 produces a wide signal 538' such that the duty cycle of the pulse width modulated signal PWM1 is adjusted from a bit to a second level. Therefore, when the power switch 3G4 is turned on next time, the luminance output of the LED chain 312 is adjusted in accordance with the target luminance output determined by the reference signal REn and the pulse width modulation signal PWM1. 6 is an exemplary signal waveform diagram in analog dimming mode, including LED current 602 flowing through LED chain 312, pulse signal 53/, 'V522 indicating SR flip-flop 522, indicating and gate 524. The π% of the turn and the on/off state of the switch Q16. Figure 6 will be described in conjunction with Figures 4 and 5. In operation, pulse signal generator 504 generates pulse signal 536. In response to each of the pulse signals 536, the SR flip-flop generates a digital signal at the (four) output and the digital signal 1 at the Q output of the SR flip-flop 522 causes the control switch _ to conduct. When the control switch (10) is turned on, the inductor L1 current ramps up and the LED current 6〇2 increases. When the LED current 602 reaches the peak value Imax, that is, the voltage of the current sensing signal sen is substantially equal to the voltage of the reference signal REF, the comparator 534 generates the R input terminal of the digital tiger 1 to SR flip-flop 522, so that the SR flip-flop 522 Generates a digital signal at the Q output. When the flip-flop 522 _ output is a digital signal G, the control is off _ _. #控关(10) Turns off the inductor L1 to supply power to the LED chain 312, and [ED current 602 is reduced. In the analog dimming mode, by adjusting the reference signal REF, the LED average current can be adjusted accordingly, so that the luminance output of the LED chain 312 is adjusted. 0781 -TW-CH Spec+Claim(sandra. T-2012020] ). D〇c 19 201236512 Figure 7 shows an exemplary signal waveform diagram in the sudden dimming mode, including current 602 flowing through LED chain 312, pulse signal 536, V522 indicating the output of SR flip-flop 522, representation and gate The 524 output V524, the on/off state of the control switch Q16, and the pulse width modulation signal PWM1. Figure 7 will be described in conjunction with Figures 4 and 5. When PWM1 is the digital signal 1, the correlation between the LED current 602, the pulse signals 536, V522, V524 and the on/off state of the control switch Q16 is similar to that of Fig. 6. When PWM1 is a digital signal ,, the output of AND gate 524 becomes a digital signal 〇. Therefore, the switch q16 is turned off and the LED current 602 is decreased. If the }龙} keeps the state of the digital signal 足够 long enough, the led current 602 will decrease to 〇. In this sudden dimming mode, by adjusting the duty cycle of pwM1, the average LED current can be adjusted accordingly, so the luminance output of the LED chain 312 is also adjusted. Figure 8 is a block diagram showing the operation of a light source driving circuit in accordance with an embodiment of the present invention. Figure 8 will be described in conjunction with Figure 5. In the example shown in FIG. 8, whenever the trigger monitoring unit 5〇6 detects the turn-off operation of the power switch 304, the count value of the counter 526 is incremented by the counter 526, which is a 2-bit count n, the maximum count value. Is 3. In the dim-to-dim dimming mode ... the narrow state is read from the count 526 and the count value is lowered in response to the increase in the count value. The voltage of the reference signal _ determines the (10) current of the current, which also determines the average LED current value. In the sudden dimming mode, the ratio converter 528 reads the count value from the counter 526, and increases the fine count value to lower the pulse width modulation signal p (e.g., each time). The counter jumps to the maximum count value (: 0781 _ΤΛν~(:ί·ί Spec+Claim(sandra. Bu 20 丨 2 feet; l. Doc 20 201236512 3) was reset afterwards. The above is shown as a method & diagram for adjusting power to a light source according to an embodiment of the present invention. Figure 9 will be described in conjunction with Figures 4 and 5. In (10) 2, the power supplied by the power converter (e.g., power converter 310) supplies power to the light source (e.g., (10) chain 312). The switch monitor signal (for example, received by the dimming controller 308) is received. The switch monitoring signal indicates a power switch coupled between the power source and the power (such as the operation of the power switch 3 (4). In the step, the dimming signal is generated according to the off monitoring signal. In step 9〇8, according to the dimming A switch (such as a control switch (10)) that is connected in series with the light source to regulate the regulated power from the power converter. In an analog dimming mode, in an analog dimming mode, the dimming signal and the representative light source are compared. The light source current is small to feedback the current sensing signal to adjust the power of the power from the power converter. In another embodiment, in the sudden dimming mode, the pulse is controlled by the dimming signal. The duty cycle of the width modulation signal is used to tune the regulated power from the power converter. Accordingly, embodiments in accordance with the present invention provide a light source driving circuit that can be based on an indication power switch (eg, power fixed to the wall) Switch) The operated switch monitors the signal to regulate the power of the light source. The power of the light source is provided by the power converter and is controlled by the dimming controller via a switch that is coupled in series with the light source. Adjustment is made. Advantageously, as previously described, the user can adjust the shell output of the light source through operation of a normal power switch (eg, a shutdown operation). Therefore, no additional devices (such as an external dimmer) are required. Or a specially designed switch with a dimming button), thus reducing the cost. Figure 10 is not a light source driving circuit according to an embodiment of the invention 0081-TW-CH Spec+Claim (sandra. T-20120201) d〇c 21 201236512 1000 circuit diagram. Figure. 10 will be described in conjunction with FIG. Figure 1〇 has similar functions to those of Figure 3 and Figure 4. The light source driving circuit 1000 includes a force coupled to the power source and the LED chain 312 for receiving power from the power source and providing power to the lED chain 312. The dimming controller 1_ monitors the operation of the power switch 304 between the power source and the light source driving circuit by monitoring the voltage at the terminal CLK. The dimming controller 1()() 8 receives a dimming request signal indicating the power switch 304, the first plurality of operations, and a dimming termination signal indicating the first plurality of operations of the power switch 304. The dimming controller 1 is left-handed, and the point GLK is connected to the (four) optical request signal and the dimming termination money. The adjusted power from the power converter 310 can also be continuously adjusted if the dimming request money 'dimming control' face is received, and if the dimming termination signal is received, the adjusted power from the power converter 31G is stopped. In other words, once the first plurality of operations of the power switch 304 are monitored, the dimming control cries 1 8 continuously adjusts the regulated power from the power converter 31G until: the second plurality of operations of the power switch are detected. In one embodiment, the light controller 1 adjusts the regulated power from the power converter 31 by controlling the control switch Q16 that is subtracted in series with the LED chain 312. Figure 11 is a diagram showing an exemplary architecture of the dimming controller 1008 of Figure 10 in accordance with an embodiment of the present invention. The figure will be described in conjunction with FIG. Elements in Fig. 11 that are identical in number to those in Figs. 4, 5, and 1Q have a similar function. In the example of FIG. 11, the architecture of the dimming controller 1008 is similar to that of the dimming controller 308 of FIG. The difference is in the dimmer @11〇2 and the trigger monitoring unit 1106. In the figure, the trigger monitoring unit li〇6 is 0781 -TW-CH Spec+Claim(sandra. T-20120201 ). Doc 22 201236512 The dimming device 1102 generates the reference signal REF by the end point ακ minus the thief's financial value and the secret money number μ to enable the silk energy production (2) (10) (10) also controls the conduction state of the switch with the (10) chain 312. To adjust the power of the LED chain 312, or in the sudden dimming mode = 02 to generate a control hu 538 to adjust the two-cycle period of the pulse width modulation signal bile to adjust the power of the LE_312. In the example of FIG. u, the dimmer 1102 includes a clock generator _ for generating a clock signal purely with the trigger monitoring unit 11() 6, a counter 1126' driven by the clock signal, and a counter 1126 Digital/analog (d/a) converter is smart. The dimmer 1102 also further includes a pulse width modulation (pwM) signal generator 53A coupled to the digital/analog ratio (d/a) conversion benefit 528. In operation, when power switch 304 is turned "on" or "off", trigger monitoring unit 1106 can monitor the positive or negative edge of the voltage at endpoint CLK, respectively. For example, when the power switch 304 is turned off, the capacitor ci〇 discharges power to the dimming controller 11〇8. The voltage across resistor R6 drops to 〇. Therefore, the trigger monitoring unit 1106 can detect a voltage negative edge on the terminal CLK. Similarly, when the power switch 304 is turned on, the voltage across the resistor R6 rises to a predetermined voltage. Therefore, the trigger monitoring unit 11〇6 can monitor a voltage positive edge on the terminal clk. As previously discussed, by monitoring the voltage on the terminal CLK, the trigger monitoring unit 1106 can monitor the operation of the power switch 304, such as a turn-on or turn-off operation. In one embodiment, when the first plurality of operations of the power switch 304 are monitored, the trigger monitoring unit 1106 receives the dimming via the endpoint CLK. When a plurality of operations of the power switch 304 are monitored to 0781 TW-CH Spec+Claim (sandra. T-20l20201), doc 23 201236512 When the 'trigger monitoring unit 1106 receives the dimming termination signal via the endpoint CLK=in the embodiment, the first plurality of operation packets of the power switch 3G4 are first-off operation and thereafter The first conduction operation. In an embodiment, the second plurality of operations of the power switch 304 includes a second shutdown operation and a first conduction operation. The fruit trigger monitoring unit 1106 receives the dimming request signal, and the dimming control thief 1108 begins to continuously adjust the regulated power from the power converter 31(). In the analog dimming mode, the dimming controller 11A adjusts the voltage of the reference signal REF to adjust the regulated power from the power converter 31A. . In the dimming dimming mode, the dimming control H丨 should adjust the duty cycle of the pulse width modulation signal PWM1 to regulate the regulated power from the power converter. If the trigger monitoring unit 1106 receives the dimming termination signal, the dimming controller 1108 stops adjusting the regulated power from the power converter 31A. Figure 12 is a block diagram showing the operation of a light source driving circuit including a dimming controller 1108 in the drawing, in accordance with an embodiment of the present invention. Fig. 12 will be described in conjunction with Fig. 10 and Fig. 11. It is assumed that the power switch 304 is turned off at the initial moment. In operation, in an embodiment, when the power switch 304 is turned on by the user, the LED chain 312 is powered by the regulated power from the power converter 310 to produce an initial luminance output. In analog dimming mode, the initial luminance output is determined by the initial voltage of the reference signal. In the sudden dimming mode, the initial luminance output is determined by the initial duty cycle (e.g., 1〇〇%) of the pulse width modulation signal PWM1. In one embodiment, the reference signal REF and the pulse width modulation signal pw are counted by the digital/analog ratio (D/A) converter 528 according to the count of the counter 1126 0781 - TW-CH Spec + Claim (sandra. T-20120201 ). Doc 24 201236512 and ;;: initial ~ by adding both can be power switch - a plurality of operations 'generating dimming request switch 3 〇 4 number: number: including the first shutdown operation; two; = this one Then, the trigger monitoring unit 11〇6 is made at the end face. If the voltage negative edge 1204 and the subsequent positive edge = to the package dimming request signal, the monitoring unit (10) is triggered. Return to the EN signal. Thus, the enable clock generator (10) can change the count value in response to the clock signal == clock pulse by the generated counter 1126 driven by the clock signal. In the real money of Fig. 12, the count value is increased by the pulse number. In the embodiment, when the counter 1126 reaches the maximum count value of the tone setting, the count value is reset to Q. In another embodiment, the count value is incremented until the count H 1126 is based on the maximum count value, and then the count value is decreased until the counter 1126 reaches the preset minimum count value. ..., in the analog meter mode, the digital/analog ratio (D/A) converter 528 reads the value from the counter 1126 and reduces the voltage of the reference signal REF in response to an increase in the count value. In the sudden dimming mode, the digital/analog ratio (D/A) converter 528 reads the count value from the counter U26 and reduces the duty cycle of the pulse width modulation signal PWM1 in response to the increase in the count value (eg, 10 reductions per time). %). Accordingly, since the adjusted power from the power converter 310 is determined by the voltage of the reference signal REF (in the analog dimming mode) or by the duty cycle of the pulse width modulation signal PWM1 (in the dimming mode) 'So the brightness of the LED chain 312 can be adjusted. 0781-TW-CH Spec+Claim(sandra. T-20120201). Doc 25 201236512 To the desired 7 degree output, the user terminates the brightness by applying a second plurality of operations to the power switch 304. Once the second plurality of operations are detected, a dimming termination signal is generated. In the embodiment, the second plurality, the packet, the second gate, and the subsequent second conduction operation. Such a: 9n « touch-hearted meter test 1106 at the end point CLK monitored to include the voltage negative edge 1208 and the rear positive edge (10) of the stop signal. _ 贞 贞 调 调 调 ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ According to this, in the ship dimming mode, the voltage of the reference signal (4) will be spread in the sensitive turn. In the sudden dimming mode, the duty cycle of the pulse width modulation MPWM1 will remain at the desired value. Therefore, the &degree output of (4) chain 312 will be converted to the desired luminance output. Figure 13 is a flow chart 13 of a method of adjusting the power of a light source in accordance with an embodiment of the present invention. Figure 13 will be described in conjunction with Figure 1 and Figure u. In step 1302, power is supplied to the light source (eg, LED chain 312) with the adjusted power from the power converter (eg, power converter 310). In step 1304, the dimming request signal is received (eg, by dimming control state 1108). receive). The dimming request signal indicates a first plurality of operations of a power switch (e.g., power switch 3〇4) coupled between the power source and the power converter. In an embodiment, the first plurality of operations of the power switch includes a first shutdown operation and a subsequent first conduction operation. In step 1306, the regulated power from the power converter is continuously adjusted (as adjusted by dimming controller 1108). In an embodiment, the clock generator 1104 is enabled to drive the counter 1126. According to the count 0781 -TW-CH Spec+Claim(sandra. T-20120201 ). Doc 26 201236512 The count value of 1126 produces a dimming signal (such as signal REF). In the class β 唬 538 or the reference finger (10) IT formula, by comparing the reference signal and the crying of the power conversion, the node senses the signal to adjust the power. The voltage of REF is determined by the count value. The dimming mode is changed by the control signal to adjust the pulse from the power converter. The Bayesian period of WM1 is determined by the count value. == stop signal (such as by the switch between the dimming control force converter is connected to the power supply and the electric: rr, j, the second plurality of operations of the power switch includes the first shutdown operation and Subsequent second conduction operation. In 131G, 'if the dimming termination signal is received, the adjusted power from the power converter is stopped. In the embodiment, except for the next day, 11G4 is such that the count 111126 holds it. The count value is not, /, in the analog dimming mode, the reference signal REF is the desired level of the voltage shovel Pwt. In the sudden dimming mode, the remainder of the pulse width modulation signal will be a simple value. Therefore, the desired brightness The output of the light source driving circuit 14 according to an embodiment of the present invention is shown in Fig. 4A. The components of the same reference numerals as those of Figs. 3, 4, and 10 in Fig. 14A have similar functions. Fig. 14A will be combined. The light source driving circuit 14 0 0 is connected to the electric n (such as 110/120 VAC, 6 Hz) through the power switch 丨4 〇4, and is connected with the light source 1412. θ 14B is not according to the present. Power supply opening 781-TW-CHSpec+Cla in Fig. 14a inventing an embodiment Im(sandra. T-2〇i2〇2〇l). D〇c 27 201236512 Close the picture of 1404. In one embodiment, the power switch legs are 0N/0FF switches placed on the wall. The closing or disconnection of the power supply f·14G4 can be controlled by switching the position (10) or where (for example, by the user). . The light source driving circuit 14GQ as shown in Fig. 14A includes an AC/DC converter 306, a conversion benefit 141, and a dimming controller 14A8. The AC/DC converter 306 converts the AC input voltage V[N to a DC output voltage v_. The converter 141, which is connected to the parent/DC converter 306, receives the DC output voltage V to provide the wheel body with the output power. The dimming controller 14〇8 coupled to the AC/DC converter 306 and the conversion benefit 1410 monitors the power switch 1404 and adjusts the output power of the converter 141〇 according to the action of the power switch 1404 to control the light emitted by the light source 1412. The color and brightness. In an embodiment, the dimming controller temple includes a plurality of endpoints, such as endpoint HV, endpoint CLK, endpoint VDD, endpoint GND, endpoint CTRL1, endpoint Μ0Ν1, endpoint CTRL2, and endpoint Μ0Ν2. In one embodiment, light source 1412 includes a plurality of LED light sources, such as light source LED1 and light source LED2. For convenience of explanation, figure. The illustrated light source LED1 includes an LED chain and the light source LED2 includes an LED chain. Or each of the light source LED1 and the light source LED2 includes a plurality of LED chains. The light source LED1 is capable of emitting a first color of light (eg, the warm light source LED2 is capable of emitting a second color of light (eg, a cool color). Thus, by controlling the light source LED1 and the light source LED2, the light source 1412 can emit light of a different color. In one embodiment, The converter 1410 includes power converters 1414 and 1416 respectively coupled to the light sources [EDI and LED2. The power converter 1414 includes an inductor L29, a diode D25, a capacitor C26, a resistor R23, and a switch 0871-TW-CH Spec+Claim. (sandra. T-20120201 ). Doc 28 201236512 Q21 buck converter. The switch Q21 is connected in series with the light source brain. Switch Control No. 1 1450 (such as pulse width modulation number) controls the closing and closing of the switch (10). Similarly, the power converter (4) may also be a step-down converter including an inductor L30, a pole body D28, a capacitor C27, a resistor 3, and a switch (10). A switch control signal 1452 (such as a pulse width modulation pWM signal) controls the closing or opening of the control switch (10) in series with the source LED2. Power converters 1414 and 1416 may also have other configurations and are not limited to the examples in 14A. Similar to the operation of the power converter 310 (shown in Figure 4), the power converter 1414 supplies the adjusted power to the light source LED1 in accordance with the on state of the switch Q21. More specifically, in an embodiment, the switches (10), (10), or (10) are alternately closed and opened (ie, "turned on" state) to allow a current to flow through the light source. The power converter 1414 can operate in a sudden change. Light mode or analog dimming mode to adjust the adjusted power. For example, in the sudden dimming mode, the duty cycle of the switch control signal is adjusted to adjust the power supplied to the LED1. In the age dimming mode, the peak current of the light source LED1 is adjusted according to the switch control signal 1450 to adjust the power supplied to the light source LED1. In addition, if switch Q21 is open and the duration of the off state exceeds a time threshold (i.e., "off" state), the current through the source drops to zero amps, thus turning off source LED1. The operation of power converter 1416 is similar to power converter 1414. Based on the switch control signals 1450 and 1452, the converter 1410 selectively provides the regulated power to the light sources LED1 and LED2. In one embodiment, one of the switches Q21 and Q31 is in the on state, corresponding to 0781-TW-CH Spec+Claim (sandra. T-20120201). Doc 29 201236512 The light source LED1 or LED2 is powered, and the other switch in the off state turns off the corresponding light source LED1 or LED2. For example, when power is supplied to a ledi (e.g., a warm white LED chain) and LED 2 is turned off (e.g., a cool white LED chain), light 1412 emits light having a warm color temperature. Similarly, when turned off and powered to LED 2, light source 1412 emits light of a cool color temperature. Thus, by adjusting the power supplied to source 1412 (e.g., by adjusting switch control signals 1450 and 1452), the color and brightness of light source 1412 are controlled. The dimming controller 1408 monitors the action of the power switch 1404 and accordingly generates corresponding switch control signals 1450 and 1452. When the power switch 1404 is turned on, the terminal HV coupled to the AC/DC converter 306 receives power from the power supply Vin and supplies power to the dimming controller 1408. In one embodiment, when power switch 1404 is open, an electrical energy storage unit (e.g., capacitor C24) coupled to terminal VDD can power dimming controller 14A8. The endpoint G_ is coupled to the ground. In one embodiment, the terminal MON1 is coupled to the resistor R23 to monitor the current through the source LED1. Similarly, the terminal is coupled to resistor R33 to monitor the current through source LED2. In the example shown in Fig. 14A, the dimming controller 14A monitors the power switch 1404 by monitoring the voltage of the terminal CLK connected to the parent/DC converter 306. Through the endpoint CLK, the dimming controller 1408 receives a color change signal indicating a first set of actions of the power switch 1404, receives a dimming request signal indicating a second set of actions of the power switch 1404, and receives a set of power switch 1404 苐 two sets of actions The dimming termination signal. The dimming controller 14〇8 generates a switch control signal according to the signal received by the endpoint CLK 0781 -TW-CH Spec+Claim(sandra. T-20120201 ). Doc 30 201236512 1450 and 1452 to control switches Q21 and Q31, respectively.
關二，收到顏色改變信號，調光控制器1408改變開 關Q21和Q31的導通狀能 m L A血， 因此’改變了光源1412的顏 。二列説明’當光源1412的光具有一個暖色溫度時（如 =開錄態且⑽處於_狀態），概控制器剛 :別刀換開關Q21和Q31至關燈和開燈的狀態。因此，光 為i冷色溫度。同樣地，如果當光源i4i2的 門ί狀⑼2^溫度時（如⑽處於關燈狀態且卿處於 開^ 收到顏色改變信號，調光控㈣剛分別 刀=關⑽和Q31至開燈和關燈的狀態。因此，光色被 切換為一個暖色溫度。 整光請求信號，調光控湘刪對應調 整先源1412的免度。舉例說明，當光源1412的光且有一 :暖色溫/時(如卿處於開燈狀態且⑽處於關燈狀 模式或類比㈣M 作於驟變調光On the other hand, upon receiving the color change signal, the dimming controller 1408 changes the conduction state of the switches Q21 and Q31, and thus changes the color of the light source 1412. The second column shows that when the light of the light source 1412 has a warm color temperature (such as = on-record state and (10) in the _ state), the controller has just changed the state of the switches Q21 and Q31 to the off and on lights. Therefore, the light is i cool color temperature. Similarly, if the temperature of the light source i4i2 is (9) 2^ temperature (if (10) is in the off state and the qing is in the open ^ receive color change signal, the dimming control (four) has just knife = off (10) and Q31 to turn on and off The state of the lamp. Therefore, the light color is switched to a warm color temperature. The dimming request signal, the dimming control, and the adjustment of the adjustment source 1412. For example, when the light of the light source 1412 has a warm color temperature/time ( If Qing is in the light-on state and (10) is in the light-off mode or analogy (4) M is used for sudden dimming
類比調杨式’進而在預設的時間段（％ N 者直到接收到調光終止信號，提高或降低供給光源14ί2 同樣地，當光源1412的光具有一個冷色溫度時 (如⑽處_燈狀態且⑽處於開燈㈣），調光控制 =408控制開關⑽，以工作於驟變調光模式或類比調光 模式，進而在預設的時間段（如Ττη2)内或者直到接收到 調光終止信號，提高或降低供給電源1412的電能。 有利之處在於’使用者能夠透過對電源開關⑽施 以第-組動作來控制發光的顏色。使用者也能夠透過對古亥 電源開關14G4施以第二組動作來控制發光的亮度，使得 0781-TW-CH Spec+Claim(sandra.t-20120201).doc 31 201236512 光源1412的冗度逐漸降低或升高。如果達到了期望的亮 度一使，者可透過對電源開關施以第三組動作來終 =儿度，。因此避免了光色選擇和雛的額外設備（如 1置而控制态或是專門設計的具有調光按鈕的開關） 來進行亮度調節，進而節省成本。 —個實施例的圖14A中的調光 圖15將結合圖5和圖14A進 11和圖14A編號相同的元件 圖15所示為根據本發明 控制器1408的結構示意圖。 行描述。圖15中與圖5、圖 具有類似的功能。 在圖15所示的例子中’調光控制器1408包括啟動電 ，1502、低壓鎖定電路15Q4、觸發監測單元⑽6、調光 =和」554 '脈衝信號產生器5G4以及邏輯電路1556Analogy Yang type 'and then in a preset period of time (% N until receiving the dimming termination signal, raising or lowering the supply light source 14ί2 Similarly, when the light of the light source 1412 has a cool color temperature (such as (10) at the light state And (10) is on (4), dimming control = 408 control switch (10) to operate in a sudden dimming mode or analog dimming mode, and then within a preset time period (such as Ττη2) or until a dimming termination signal is received The power of the power supply 1412 is increased or decreased. The advantage is that the user can control the color of the light by applying a first-group action to the power switch (10). The user can also apply the second power to the Guhai power switch 14G4. The group action is used to control the brightness of the light, so that the redundancy of the light source 1412 is gradually reduced or increased by 0078-TW-CH Spec+Claim(sandra.t-20120201).doc 31 201236512. If the desired brightness is reached, By applying a third set of actions to the power switch, the light color selection and the additional equipment of the chick (such as a control state or a specially designed switch with a dimming button) are avoided. The brightness adjustment is performed to save the cost. The dimming pattern 15 in Fig. 14A of an embodiment will be numbered the same as that in Fig. 5 and Figs. 14A and 11A. Fig. 15 shows the structure of the controller 1408 according to the present invention. Fig. 15 has a similar function to Fig. 5. In the example shown in Fig. 15, the dimming controller 1408 includes a starter, a 1502, a low voltage lock circuit 15Q4, a trigger monitoring unit (10) 6, and dimming. = and "554" pulse signal generator 5G4 and logic circuit 1556
HV接收雪:電關1404接通時’啟動電路1502從端點 電月b，為端點VDD提供電源電壓。盥端點VDD =3路_檢測輯壓，並^ 二眸工'二_。在—個實施例中，當電源開關1404閉 &時’低壓鎖定電路1504接通調光控制器HV receives snow: When the power switch 1404 is turned on, the start circuit 1502 supplies the power supply voltage to the terminal VDD from the terminal power month b.盥 Endpoint VDD = 3 _ Detected voltage, and ^ 2 ' '二_. In one embodiment, when the power switch 1404 is closed & low voltage lockout circuit 1504 turns on the dimming controller
保持斷開且持續時間小於時間臨限值J t Γ=14Α所示)放電’為端點提供電能。 IS = ，調光控制器_仍然㈣被供電並 於:門::：τ _4 簡 值電Γ: :Γ=::的電壓下降至預設的臨限 _。HL此日夺低壓鎖疋電路15〇4關斷調光控制器 如上針對圖14A的描述， 顏色改變信號指示了電源開 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 32 201236512 了咖關1綱 組動作。右一徊香/了電源開關1404的第三 和其後的第一閉人：中莖第一組動作包括第-斷開動作 第-閉一個實施例中’第-斷開動作和 閉合動;=Γ時間間隔與第二斷開動作和第二 另 而第二時間間隔小於Tm。 合動作。纟作包括第二斷開動作和其後的第三閉 動作，第開動作跟隨著第二閉合 第二時間臨眼(:丨：動作之間_Disconnected and the duration is less than the time threshold J t Γ = 14 )) Discharge provides power to the endpoint. IS = , dimming controller _ still (four) is powered and: gate:::τ _4 simple value: :Γ=:: The voltage drops to the preset threshold _. HL this day to win the low voltage lock circuit 15〇4 turn off the dimming controller as described above for the description of Figure 14A, the color change signal indicates the power supply open 0081 - TW-CH Spec + Claim (sandra.t-20120201 ).doc 32 201236512 The coffee gate 1 group action. The right first musk/the third and subsequent first closed persons of the power switch 1404: the first set of actions of the middle stem includes a first-off action, a first-closed embodiment, a 'first-off action and a closing action; = Γ time interval and second disconnection action and second and second time interval less than Tm. Combined action. The action includes a second disconnection action and a subsequent third closing action, the first opening action follows the second closing second time to the eye (: 丨: between actions _
接收接的觸發監測電路1506透過端點CLK 關Γ導通狀態的監測信號。基於監測信 判斷電源開關14G4執行的是閉合 簡測量3 透過計時器1508，觸發監測電路 個斷開動作之間的時間間隔或是-個閉合 單元1咖=固閉°動作之間的時間間隔）。結果，觸發監測 =臟識別出顏色改變信號、調光請求信號和調光終止 #破。 調光器1552包括計數器151〇、數位/類比轉換器 、脈衝寬度調變信號產生器1514和時脈產生器1516。 與，11 +调光器1102中的操作類似’調光器1552根據計 數器1510所儲存的計數值產生調光信號抑肋。在一個實 0781-TW-CH Spec+Claim(sandra.t-20120201).doc 33 201236512 施例中，調光信號PWM3的責任週期由計數值決定。與調光 器1552耦接的邏輯電路1556包括比較器1530、SR正反器 1532和及閘1534。與包括比較器534、SR正反器522和及 閘524的電路（如圖5所示）操作類似，邏輯電路1556 根據調光信號PWM3在端點CTRL1產生開關控制信號 1450。在一個實施例中，開關控制信號145〇的責任週期由 計數器1510的計數值決定。因此，根據開關控制信號145〇 控制開關Q21，可實現調節供給光源LED1的電能。 類似地’調光器1554包括計數器1520、數位/類比轉 換器1522、脈衝寬度調變產生器1524和時脈產生器1526。 調光器1554用於產生調光信號PWM4。與調光器1554耦接 的邏輯電路1558包括比較器1540、SR正反器1542和及閘 1544。邏輯電路1558產生開關控制信號1452。調光信號 PWM4和開關控制信號1452的貴任週期由計數器152〇的計 數值決定。因此，根據開關控制信號1452控制開關Q31， 可實現調節供給光源LED2的電能。 表1描述了根據本發明一個實施例的計數器1510或 1520的計數值’也描述了對應計數值的開關控制信號145〇 或1452的責任週期。如表1所示，如果計數值設為〇，責 任週期為0，因此，對應的控制開關Q21或Q31工作於關 燈狀態，以關斷對應的LED光源。如果計數值大於〇 (如j 〜10)，責任週期大於0，因此對應的開關Q21或Q31工作 於開燈狀態，為對應的LED光源供電。 0781 -TW-CH Spec+Claim(sandra.t-20 \ 20201 ).doi 34 201236512 表1 計數 值 0 1 2 3 4 5 6 7 8 9 10 責任 週期 0 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 低壓鎖定電路1504在端點VDD檢測電源電壓。在一個 貫施例中，低壓鎖定電路15〇4根據端點VDD的電源電壓調 整計數器1510和1520的計數值。更具體地說，當端點VDD 上的電源電壓降到限值電壓VTHL以下時，低壓鎖定電路 1504將計數器1510和1520的計數值設置為第一組預設 值。當端點VDD的電源電壓上升到yTHL以上時，低壓鎖定 電路1504將計數器1510和1520的計數值設置為第二組預 設值。例如，當電源電壓降到低於臨限值電壓Vm時，計 數器1510和1520的計數值都被設為〇。因此，光源LED1 和LED2被關斷。當電源電壓升到高於Vm時，計數器151〇 和1520的计數值分別被设為1 〇和〇。因此，接通光源[ED 1 並關斷光源LED2。 在一個實施例中，調光控制器14〇8還包括匯流排 1560，用於連接調光器1552、調光器1554和觸發監測單 元1506。在一個實施例中，觸發監測單元15〇6產生致能 信號ENcql、ΕΝ·】和EN爾2，用以調整計數器151〇和152〇 的計數值。 更具體地說，在一個實施例中，當接收到顏色改變信 號時，觸發監測單元15 0 6產生致能信號E NeGL。匯流排丨5 6°〇 將致能信號ENm傳送到計數器ι51〇和152〇。在一個實施 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 35 201236512 例中，计數器1510和1520的計數值相互交換，以回應致 能信號ENcm。例如，如果計數器151〇和152〇的計數值分 別為5和0，表示光源1412發出的光具有暖色溫度（LED1 接通而LED2斷開）。在接收到致能信號·孤之後，計數器 1510和1520的計數值分別變成了 〇和5,因此光源變成了 冷色溫度（LED1斷開而LED2接通）。優點在於，雖然光的 顏色被改變，但是光的亮度保持不變。或者，計數器151〇 和1520的計數值可改變為其他值。例如，計數器ι51〇和 1520的si*數值可設為〇和1〇。在這樣的情況下，光的顏色 和亮度都發生改變。 在一個實施例中，如果接收到調光請求信號，觸發監 測單元1506透過監測計數值來判斷哪一個開關處於開燈 狀癌，並據此產生有效的致能彳§ 5虎£NDIM1來控制處於開燈狀 態的開關。舉例說明，如果開關Q21處於開燈狀態，時脈 產生器1516根據有效的致能信號ΕΝ_為計數器151〇提供 一個時脈信號CLOCK1。因此，計數器15ι〇調整計數值， 進而調整光源LED1的亮度。例如，計數值連續增加，因此 光源LED1的壳度逐漸增加。如果接收到調光終止信號，或 者焭度調整超過了一個預設的時間間隔，觸發監測單元 1506產生無效的致能信號ENdimi。因此時脈信號CLOCK1被 終止，計數器1510停止調整計數值。即亮度調整結束。 因此透過調整計數器1510和1520的計數值，調節了 供給光源1412的電能，進而實現光色的改變和亮度的調 整。 圖16所示為根據本發明一個實施例的光源驅動電路 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 36 201236512 的運作時序圖’光源驅動電路包含圖15中所示的調光控制 器1408 °圖16將結合圖14A和圖15進行描述。圖16描 述了端點CLK的電壓Vaic、由觸發監測單元1506產生的致 能信號ENcol、eNihm丨和EN_、時脈信號CLOCK1和CLOCK2， 以及計數器1510和1520的計數值VALUE_1510和 VALUE_1520。圖16所示的例子描述了光源1412的亮度是 如何調整的。 在時刻t0，電壓Vm為低電位，指示電源開關1404斷 開。在一個實施例中，計數值VALUE_1510和VALUE_1520 都為0。因此開關Q21和Q31都處於關燈狀態，光源LED1 和LED2關斷。 在時刻tl ’電源開關1404閉合。端點HV接收來自交 流/直流轉換器306的電能。此時端點VDD的電壓上升到 Vm。在一個實施例中，低壓鎖定電路15〇4分別設 VALUE—1510 和 VALUE一 1520 為 10 和 〇。因此，開關 Q21 被 切換為開燈狀態而開關Q31保持關燈狀態^對應地，光源 1412在時刻tl發出具有暖色溫度的光。 在時刻t2’電壓Vclk具有指示電源開關1404斷開動作 的負緣。在時刻t3,電壓VcLk具有指示電源開關14〇4閉合 動作的正緣。由於t2和t3之間的時間間隔ή小於第一時 間臨限值ΤτΗ1，觸發監測單元1506辨別出接收到調光請求 信號。因此在時刻t3，觸發監測單元1506產生有效的致 能信號ENdIMi ’使得時脈產生器1516產生時脈信號 CL0CK1。在圖16所示的例子中，計數值VAlue_151〇增加 (如從1到6)，逐漸提高光源1412的亮度。 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 37 201236512 的斷t 在壓-的負緣，指示電源開關1404 源開關^ 時 檢測到電壓VcLK的正緣，指示電 T2小於黛4的閉合動作。由於t3和t4之間的時間間隔 桃限值ΤτΗ2,贿㈣料讓識別出接 信號。對應地，致能信號εν_變為無效（如 r日_、冬止時脈信號CL0CK1。因此，計數值VALUE」510 ^變^ t5開始保持計數值為6 ’即保持光源1412的亮度 馳Ϊ時刻t6 ’電壓VaK有—個負緣，指示電源開關1404 拉歼動作。電源開關斷開的時間間隔（如從忧到口的 =間間隔）達到時間臨限值ΤτΗ ，指示端點的電源電 I：下降到vTILVDD。由此，在一個實施例中，低壓鎖定電路 1504將VALUE一1510和VALUE—1512再次設為〇。因此，在 時刻t7，光源1412被關斷。 圖Π所不為根據本發明一個實施例的光源驅動電路 的另一種運作時序圖，光源驅動電路包含有圖15中所示的 凋光控制器1408。圖Π將結合圖14A和圖15進行描述。 圖Π描述了端點CLK的電壓vCLK、由觸發監測單元1506 產生的致能信號ENcql、EN_丨和ENdim2、時脈信號CLOCK1和 CLOCK2，以及計數器1510和1520的計數值VALUE—1510 和VALUE_1520。圖17所示的例子描述了光源丨412的顏色 和亮度是如何調整的。 在時刻t0’，電壓Vm(為低電位，指示電源開關1404 斷開。計數值VALUE」510和VALUE—1520為0。因此開關 Q21和開關Q31處於關燈狀態，LED1和LED2熄滅。 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 38 201236512 在時刻tl’ ，電源開關1404接通。低壓鎖定電路1504 將VALUE_1510和VALUE—1520分別設為10和0。因此，開 關Q21被切換到開燈狀態而開關Q31保持在關燈狀態。對 應地’光源1412發出具有暖色溫度的光。 在時刻t2’ ，電壓Vcu有一個負緣，在時刻t3，，電 壓Vcu有一個正緣，即在時刻t2，發生斷開動作，隨後在 時刻t3’發生閉合動作。t2’到t3，之間的時間間隔大於 第一時間臨限值Tthi，指示接收到顏色改變信號。因此，在 一個實施例中，觸發監測單元1506在時刻ΐ3，產生有效 的致能信號ENcgl (如脈衝信號），用以交換儲存在計數器 1510 和 1520 内的計數值。因此，VALUE_151〇 和 VALUE—152〇 分別被設為0和10。對應地’開關Q21被切換到關燈狀態， 開關Q31被切換到開燈狀態。因此，在時刻u，，光源mi〗 的顏色變為冷色溫度而其亮度保持不變。 在時刻t4’，電壓VaK有一個負緣，在時刻t5，，電 壓VaK有一個正緣，即在時刻t4’發生斷開動作，隨後在 時刻t5’發生閉合動作。t4’到t5’夕士 一 之間的時間間隔小於 Τ™ ’即指示接收到調光請求信號。作為回應、，觸_ 元1506產生有效的致能信號ΕΝ_。由此，產 CLOCK2，計數值VALUE—1520增加（如從i到 步提高光源1412的亮度。 、 在時刻t6! 电您^具有負緣，在時刻以，電壓 VCLK具有正'緣’即在時刻t6’發生斷開動作 ，閉合動作。由於t6，到t7，之間的時間間隔= τ·，表雜㈣碱終止錢。料叫料錢en_ 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 39 201236512 變為無效，時脈信號CL0CK2被終止。因此，從時刻t7, 開始，計數值VALUE—1510保持為3，以保持光源1412的 亮度不變。 在時刻t8’ ，電壓Vcu具有負緣，表示電源開關14〇4 的斷開動作。在—個實施例中，電源開關14 G 4斷開的時間 間隔（如從t8,到t9,）達到了時間臨限值Vvdd，表示 端點VDD #供電電壓下_ Vth⑽。此時，低壓鎖定電路 1504再次將VALUE—1510和VALUE_152〇設為〇。因此，在 時刻t9’，光源丨412熄滅。 圖18所示為根據本發明一個實施例的光源驅動電路 的又-運作時序圖，光源驅動電路包含有圖15中所示的調 光控制器1408。® 18將結合圖14A和圖15進行描述。圖 18描述了端‘點CLK $電壓VcLK、由觸發監測單元簡產生 =信號El、ENdimi和El2、時脈信號咖和 L計數器1510和1520的計數值VALUE 1510和 ALUE—1520。圖18所示的例子描述了 _ 如何調整的。 厌疋 在從t0到t3之間的時間間隔内，調光控哭1棚 的操作類似於圖16中描述的從_t3的操作。^，時 trThe receiving trigger monitoring circuit 1506 transmits the monitoring signal of the on state through the endpoint CLK. Based on the monitoring signal, it is judged that the power switch 14G4 performs the closed simple measurement 3 through the timer 1508, triggers the time interval between the opening actions of the monitoring circuit or the time interval between the closing units 1 and the closed operation. . As a result, the trigger monitoring = dirty recognizes the color change signal, the dimming request signal, and the dimming termination #break. The dimmer 1552 includes a counter 151A, a digital/analog converter, a pulse width modulation signal generator 1514, and a clock generator 1516. Similar to the operation in the 11 + dimmer 1102, the dimmer 1552 generates a dimming signal rib based on the count value stored by the counter 1510. In a real example of the 0781-TW-CH Spec+Claim (sandra.t-20120201).doc 33 201236512, the duty cycle of the dimming signal PWM3 is determined by the count value. Logic circuit 1556 coupled to dimmer 1552 includes a comparator 1530, an SR flip-flop 1532, and a gate 1534. Similar to the operation of the circuit including comparator 534, SR flip-flop 522, and AND gate 524 (shown in Figure 5), logic circuit 1556 generates switch control signal 1450 at terminal CTRL1 based on dimming signal PWM3. In one embodiment, the duty cycle of switch control signal 145A is determined by the count value of counter 1510. Therefore, according to the switch control signal 145 〇 controlling the switch Q21, the electric energy supplied to the light source LED1 can be adjusted. Similarly, the dimmer 1554 includes a counter 1520, a digital/analog converter 1522, a pulse width modulation generator 1524, and a clock generator 1526. A dimmer 1554 is used to generate the dimming signal PWM4. Logic circuit 1558 coupled to dimmer 1554 includes comparator 1540, SR flip-flop 1542, and AND gate 1544. Logic circuit 1558 generates a switch control signal 1452. The duty cycle of the dimming signal PWM4 and the switch control signal 1452 is determined by the count value of the counter 152A. Therefore, by controlling the switch Q31 according to the switch control signal 1452, it is possible to adjust the electric energy supplied to the light source LED2. Table 1 depicts the count value of the counter 1510 or 1520' in accordance with one embodiment of the present invention also describing the duty cycle of the switch control signal 145A or 1452 of the corresponding count value. As shown in Table 1, if the count value is set to 〇, the duty cycle is 0. Therefore, the corresponding control switch Q21 or Q31 operates in the off state to turn off the corresponding LED light source. If the count value is greater than 〇 (such as j ～10), the duty cycle is greater than 0, so the corresponding switch Q21 or Q31 operates in the light-on state to supply power to the corresponding LED light source. 0781 -TW-CH Spec+Claim(sandra.t-20 \ 20201 ).doi 34 201236512 Table 1 Count value 0 1 2 3 4 5 6 7 8 9 10 Cycle of responsibility 0 10% 20% 30% 40% 50% 60 % 70% 80% 90% 100% The low voltage lockout circuit 1504 detects the supply voltage at the terminal VDD. In one embodiment, the low voltage lockout circuit 15〇4 adjusts the count values of the counters 1510 and 1520 based on the supply voltage of the terminal VDD. More specifically, when the supply voltage at the terminal VDD falls below the limit voltage VTHL, the low voltage lockout circuit 1504 sets the count values of the counters 1510 and 1520 to the first set of preset values. When the power supply voltage of the terminal VDD rises above yTHL, the low voltage lock circuit 1504 sets the count values of the counters 1510 and 1520 to the second set of preset values. For example, when the power supply voltage drops below the threshold voltage Vm, the count values of the counters 1510 and 1520 are both set to 〇. Therefore, the light sources LED1 and LED2 are turned off. When the power supply voltage rises above Vm, the count values of the counters 151 〇 and 1520 are set to 1 〇 and 〇, respectively. Therefore, the light source [ED 1 is turned on and the light source LED 2 is turned off. In one embodiment, dimming controller 14A8 further includes a busbar 1560 for connecting dimmer 1552, dimmer 1554, and trigger monitoring unit 1506. In one embodiment, the trigger monitoring unit 15〇6 generates enable signals ENcq1, ΕΝ·] and EN 2 for adjusting the count values of the counters 151〇 and 152〇. More specifically, in one embodiment, when a color change signal is received, the trigger monitoring unit 156 generates an enable signal E NeGL . Busbar 丨5 6°〇 The enable signal ENm is transmitted to the counters ι51〇 and 152〇. In an example 0781 - TW-CH Spec + Claim (sandra.t-20120201 ).doc 35 201236512, the count values of the counters 1510 and 1520 are exchanged in response to the enable signal ENcm. For example, if the count values of the counters 151 〇 and 152 分 are 5 and 0, respectively, it means that the light emitted by the light source 1412 has a warm color temperature (LED1 is turned on and LED 2 is turned off). After receiving the enable signal and the lone, the count values of the counters 1510 and 1520 become 〇 and 5, respectively, so that the light source becomes a cool color temperature (LED1 is turned off and LED2 is turned on). The advantage is that although the color of the light is changed, the brightness of the light remains unchanged. Alternatively, the count values of the counters 151 〇 and 1520 can be changed to other values. For example, the si* values for counters ι51〇 and 1520 can be set to 〇 and 1〇. In such a case, the color and brightness of the light change. In one embodiment, if a dimming request signal is received, the trigger monitoring unit 1506 determines which switch is in the on-card cancer by monitoring the count value, and accordingly generates an effective enablement 彳 5 5 tiger £NDIM1 to control the Switch on the light state. For example, if the switch Q21 is in the on state, the clock generator 1516 provides a clock signal CLOCK1 to the counter 151 根据 according to the valid enable signal ΕΝ_. Therefore, the counter 15 is adjusted to adjust the count value, thereby adjusting the brightness of the light source LED1. For example, the count value continuously increases, so the shell of the light source LED1 gradually increases. If a dimming termination signal is received, or the temperature adjustment exceeds a predetermined time interval, the trigger monitoring unit 1506 generates an invalid enable signal ENdimi. Therefore, the clock signal CLOCK1 is terminated, and the counter 1510 stops adjusting the count value. That is, the brightness adjustment ends. Therefore, by adjusting the count values of the counters 1510 and 1520, the electric energy supplied to the light source 1412 is adjusted, thereby realizing the change of the light color and the adjustment of the brightness. Figure 16 is a timing diagram showing the operation of the light source driving circuit 0771-TW-CH Spec+Claim(sandra.t-20120201).doc 36 201236512 according to an embodiment of the present invention. The light source driving circuit includes the tone shown in FIG. Light controller 1408 ° Figure 16 will be described in conjunction with Figures 14A and 15. Fig. 16 depicts the voltage Vaic of the terminal CLK, the enable signals ENcol, eNihm, and EN_ generated by the trigger monitoring unit 1506, the clock signals CLOCK1 and CLOCK2, and the count values VALUE_1510 and VALUE_1520 of the counters 1510 and 1520. The example shown in Figure 16 describes how the brightness of the light source 1412 is adjusted. At time t0, voltage Vm is low, indicating that power switch 1404 is off. In one embodiment, the count values VALUE_1 510 and VALUE_1 520 are both zero. Therefore, the switches Q21 and Q31 are both turned off, and the light sources LED1 and LED2 are turned off. At time t1' the power switch 1404 is closed. The endpoint HV receives power from the AC/DC converter 306. At this point, the voltage at the terminal VDD rises to Vm. In one embodiment, the low voltage lockout circuit 15〇4 sets VALUE-1510 and VALUE-1520 to 10 and 分别, respectively. Therefore, the switch Q21 is switched to the on state and the switch Q31 is kept turned off. Accordingly, the light source 1412 emits light having a warm color temperature at time t1. At time t2', the voltage Vclk has a negative edge indicating that the power switch 1404 is turned off. At time t3, the voltage VcLk has a positive edge indicating that the power switch 14〇4 is closed. Since the time interval t between t2 and t3 is less than the first time threshold ΤτΗ1, the trigger monitoring unit 1506 recognizes that the dimming request signal is received. Therefore, at time t3, the trigger monitoring unit 1506 generates a valid enable signal ENdIMi' such that the clock generator 1516 generates the clock signal CL0CK1. In the example shown in Fig. 16, the count value Valuue_151 is increased (e.g., from 1 to 6), and the brightness of the light source 1412 is gradually increased. 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 37 201236512 break t at the negative edge of the voltage, indicating the positive edge of the voltage VcLK when the power switch 1404 source switch ^ is detected, indicating that the electric T2 is less than 黛4 closing action. Since the time interval between t3 and t4 is the peach limit ΤτΗ2, the bribe (four) material is used to identify the signal. Correspondingly, the enable signal εν_ becomes invalid (such as r day _, winter stop clock signal CL0CK1. Therefore, the count value VALUE" 510 ^ change ^ t5 starts to keep the count value of 6 ', that is, keep the brightness of the light source 1412 gallop At time t6 'voltage VaK has a negative edge, indicating that the power switch 1404 is pulling. The time interval of the power switch being off (such as from the worry to the mouth = interval) reaches the time threshold ΤτΗ, indicating the power supply of the terminal I: Drop to vTILVDD. Thus, in one embodiment, the low voltage lockout circuit 1504 resets VALUE-1510 and VALUE-1512 to 〇 again. Therefore, at time t7, the light source 1412 is turned off. Another operational timing diagram of the light source driving circuit of one embodiment of the present invention, the light source driving circuit includes the lightening controller 1408 shown in Fig. 15. The drawing will be described with reference to Figs. 14A and 15. The voltage vCLK of the point CLK, the enable signals ENcql, EN_丨 and ENdim2 generated by the trigger monitoring unit 1506, the clock signals CLOCK1 and CLOCK2, and the count values VALUE-1510 and VALUE_1520 of the counters 1510 and 1520 are shown in FIG. Example description The color and brightness of the light source 丨 412 are adjusted. At time t0', the voltage Vm (which is low, indicating that the power switch 1404 is off. The count value VALUE" 510 and VALUE-1520 are 0. Therefore, the switch Q21 and the switch Q31 In the off state, LED1 and LED2 are off. 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 38 201236512 At time t1', power switch 1404 is turned on. Low voltage lock circuit 1504 will VALUE_1510 and VALUE-1520 Set to 10 and 0 respectively. Therefore, switch Q21 is switched to the on state and switch Q31 is kept in the off state. Correspondingly, 'light source 1412 emits light having a warm color temperature. At time t2', voltage Vcu has a negative edge, At time t3, the voltage Vcu has a positive edge, that is, at time t2, an opening action occurs, and then a closing action occurs at time t3'. The time interval between t2' and t3 is greater than the first time threshold Tthi, The indication receives the color change signal. Thus, in one embodiment, the trigger monitoring unit 1506 generates a valid enable signal ENcgl (eg, a pulse signal) at time ΐ3 for exchange at the counters 1510 and 1520. Therefore, VALUE_151〇 and VALUE_152〇 are set to 0 and 10. Accordingly, the switch Q21 is switched to the off state, and the switch Q31 is switched to the on state. Therefore, at time u, The color of the light source mi is changed to a cool color temperature and its brightness remains unchanged. At time t4', the voltage VaK has a negative edge. At time t5, the voltage VaK has a positive edge, i.e., an opening operation occurs at time t4', and then a closing operation occurs at time t5'. The time interval between t4' and t5's is less than ΤTM', indicating that the dimming request signal is received. In response, the touch element 1506 generates a valid enable signal ΕΝ_. Thus, CLOCK2 is generated, and the count value VALUE-1520 is increased (for example, the brightness of the light source 1412 is increased from i to step. At time t6! The electric has a negative edge, and at time, the voltage VCLK has a positive 'edge', that is, at the moment T6' disconnection action, closing action. Since t6, to t7, the time interval = τ·, the table miscellaneous (four) alkali terminates the money. The material is called en_ 0781 -TW-CH Spec+Claim(sandra.t- 20120201 ).doc 39 201236512 becomes invalid, the clock signal CL0CK2 is terminated. Therefore, starting from time t7, the count value VALUE-1510 remains at 3 to keep the brightness of the light source 1412 unchanged. At time t8', the voltage Vcu Having a negative edge, indicating a disconnection action of the power switch 14 〇 4. In one embodiment, the time interval (e.g., from t8 to t9) at which the power switch 14 G 4 is off reaches a time threshold Vvdd, indicating The terminal VDD # supply voltage is _Vth(10). At this time, the low voltage lock circuit 1504 sets VALUE-1510 and VALUE_152 to 〇 again. Therefore, at time t9', the light source 丨 412 is turned off. Fig. 18 shows a light source according to the present invention. Still-operating timing diagram of the light source driving circuit of the embodiment, the light source The dynamic circuit includes a dimming controller 1408 as shown in Fig. 15. 18 will be described in conjunction with Fig. 14A and Fig. 15. Fig. 18 depicts the end point CLK$ voltage VcLK, generated by the trigger monitoring unit = signal El, ENdimi and El2, clock signal and L counters 1510 and 1520 have count values VALUE 1510 and ALUE-1520. The example shown in Figure 18 describes how to adjust _ 疋 in the time interval from t0 to t3 The operation of the dimming control crying 1 shed is similar to the operation from _t3 described in Fig. 16. ^, time tr
It E」51G從時刻t3，，開始調整。 f夺』t4，党度調整達到一個預設的時間間隔因 元1506產生失效的致_虎抓_，時脈 :ϊ _Ε」5ί〇從t4，，開始保持為10 且党度調整結束。 07S Ϊ -TW-CH Spec+Claim(sancira.t-201202⑴）.doc 201236512 在時刻t5”，電壓Vou有一個指示電源開關1404斷開 動作的負緣。在時刻t6”，電源開關1404斷開的時間間 隔（如彳t5 到t6 )達到時間臨限值Tth_vdd，表示端點 VDD的電源電麼下降到yTH_VDD。在一個實施例中，作為回應， 低壓鎖定電路1504再次將VALUE_1510和VALUE_1520設為 0。因此’在時刻t6”，光源1412熄滅。 回到圖15 ’調光控制器1408也可工作於類比調光模 式來調整光源1412的亮度。在一個實施例中，比較器153〇 的反相輸入端與數位/類比轉換器1512的輸出端耦接，比 較器1540的反相輸入端與數位/類比轉換器1522的輸出端 耦接。因此，參考信號REF1和REF2分別由計數器1510 和1520的計數值決定。由此，根據計數值來控制透過光源 LED1和LED2的電流峰值，實現亮度調整。 圖19所示為根據本發明一個實施例的對光源進行電 能調整的方法流程圖1900。圖19將結合圖14A至圖18進 行把述。儘管圖19公開了某些特定的步驟，這些步驟僅僅 作為示例。本發明適合執行與圖19類似或等同的其他步 驟。 在步驟1902中’將電能從轉換器141〇傳送到光源（如 光源1412)。 在步驟1904中’監測輕接於電源和轉換器141〇之間 的電源開關（如電源開關1404)。 _在步驟1906中，接收顏色改變信號，彥貝色改變信號指 示電源開關（如電源開關1404)的第一組動作。 在步驟1908中，根據顏色改變信號，調整光源（如光 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 41 201236512 源1412)的顏色。 在步驟1910中，接收調光請求信號，調光請求信號指 示電源開關的第二組動作。 在步驟1912中，根據調光請求信號，調整光源亮度。 在一個貫施例中，接收監測信號，監測信號指示電源 開關的導通狀態。根據監測信號識別出電源開關的多種動 作，包括斷開動作和閉合動作。根據動作之間的時間間隔 識別出第一組動作和第二組動作。在一個實施例中，調整 冗度#又預5又的時間間隔（如Tm )，或者直到接收到調光 終止k號’該調光終止信號指示電源開關14〇4的第三組動 作。在一個實施例中，透過調整計數器（如計數器1522 和1554)的計數值.，調整光源的顏色和亮度。 如前所述，本發明彼露了一種驅動LED光源的光源驅 動電路。優點在於，使用者可透過對電源開關施以第一組 開關動作來選擇光源顏色，也可透過對該電源開關施以第 二組開關動作來實現亮度的調整。在亮度調整過程中，光 源的亮度逐步增加或減小。當LED光源達到期望的亮度， 使用者透過對電源開關施以第三組動作來終止亮度調整過 私。因為避免了使用額外的元件（如外置的遠端控制哭咬 是專門設計的具有調光按鈕的開關）來進行亮度調節，進 而節省成本。 上文具體貫施方式和附圖僅為本發明之常用實施例 顯然’在不脫離權利要求書所界定的本發明精神和^明範 圍的前提下可以有各種增補、修改和替換。本領域^術2 員應該理解，本發明在實際應用中可根據具體的環境和工 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 42 201236512 作要求在不背離發卿則的前提下在形^、結構、佈局、 比例#材料、元素'元件及其它方面有所變化。因此，在 此彼露之實施例僅祕說明而非限制，本發明之範圍由後 附權利要求及其合法等同物界定，*不·此前之描述。 【圖式簡單說明】 以下結合附圖和具體實施例對本發明的技術方法進 H細的描述’以使本發明的特徵和優點更為明顯。其中： 圖1所示為一種習知的LED驅動電路的電路圖。 圖2所示為另一種習知的LED驅動電路的電路圖。 圖3所不為根據本發明—實施例的光源驅動電路的例 示性方塊圖。 圖4所示為根據本發明—實施例的光源驅動電路的例 示性電路圖。 圖5所示為根據本發明一實施例圖4中的調光控制器 的例示性架構圖。 圖6所示為根據本發明一實施例類比調光模式下的例 示性信號波形圖。 圖7所示為根據本發明一實施例驟變調光模式下的例 示性信號波形圖。 圖8所示為根據本發明一實施例闡釋包含圖5所示之 调光控制器的光源驅動電路之操作示意圖。 圖9所示為根據本發明一實施例的對光源調節電力的 方法流程圖。 圖10所示為根據本發明一實施例的光源驅動電路的 07S1 -TW-CH Spec+C1aim(sandra.t-20120201 ).doc 43 201236512 例示性電路圖。 圖U所示為根據本發明一實施例圖1〇中的調光控制 器的例示性架構圖。 圖12所示為根據本發明一實施例闡釋包含圖11所示 之調光控制H的光源驅動電路之操作示意圖。 圖13所示為根據本發明一實施例的對光源調節電力 的方法流程圖。 圖14A所示為根據本發明一實施例光源驅動電路的電 路圖。 圖14B所示為根據本發明一個實施例的圖μα中的電 源開關的圖示。 圖15所示為根據本發明一個實施例的圖14A中的調 光控制斋的結構示意圖。 圖16所示為根據本發明一個實施例的光源驅動電路 的運作時序圖。 圖Π所示為根據本發明一個實施例的光源驅動電路 的另一種運作時序圖。 圖18所示為根據本發明一個實施例的光源驅動電路 的又一運作時序圖。 圖19所示為根據本發明一個實施例的對光源進彳_ 能調整的方法流程圖。 T _ 【主要元件符號說明】 100 : LED驅動電路 102 :電力轉換器 0781 -TW-CH Spec-fClaim(sandra.t-20120201 ).do< 44 201236512 104 :開關 106 : LED 鏈 200 : LED驅動電路 208 :線性LED電流調節器 210 :運算放大器 300 :光源驅動電路 304 :電力開關 306 :交流/直流轉換器 308 :調光控制器 310 :電力轉換器 312 : LED 鏈 314 :電流監測器 400 :光源驅動電路 502 :調光器 504:脈衝信號產生器 506 :觸發監測單元 508 :啟動及欠電壓鎖定（UVL)電路 510 :運算放大器 512、514、515 :金屬氧化物半導體場效電晶體 (M0SFET) 516、518 :比較器 520、522 : SR 正反器 524 :及閘 526 :計數器 528 :數位/類比轉換器 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 45 201236512 530 :脈衝寬度調變信號產生器 532 :電流源 534 :比較器 536 :脈衝信號 538 :控制信號 540、54卜 542 :開關 602 : LED 電流 900 :流程圖 902、904、906、908 :步驟 1000 :光源驅動電路 1008 :調光控制器 1102 :調光器 1104 :時脈產生器 1106 :觸發監測單元 1126 :計數器 1204 :負緣 1206 :正緣 1208 :負緣 1210 :正緣 1300 :流程圖 1302、1304、1306、1308、1310 :步驟 1400 :光源驅動電路 1404 :電源開關 1408 :調光控制器 1410:轉換器 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 46 201236512 1412 :光源 1414、1416 :電力轉換器 1450、1452 :開關控制信號 1480 :按鈕 1502 :啟動電路 1504 :低壓鎖定電路 1506 :觸發監測單元 1508 :計時器 1510 :計數器 1512 :數位/類比轉換器 1514 :脈衝寬度調變信號產生器 1516 :時脈產生器 1520 :計數器 1522 :數位/類比轉換器 1524 :脈衝寬度調變信號產生器 1526 :時脈產生器 1530 :比較器 1532 : SR正反器 1534 :及閘 1540 :比較器 1542 : SR正反器 1544 :及閘 1552、1554 :調光器 1556、1558 :邏輯電路 1560 :匯流排 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 47 201236512 1900 :流程圖 1902、1904、1906、1908、1910、1912 :步驟 0781 -TW-CH Spec+Claim(sandra.t-20120201 ).doc 48It E" 51G starts to adjust from time t3. f wins t4, the party's adjustment reaches a preset time interval. Because of the failure of the 1506, the _ _ _ Ε, the clock: ϊ _ Ε 5ί〇 from t4, began to remain at 10 and the party adjustment ended. 07S Ϊ -TW-CH Spec+Claim(sancira.t-201202(1)).doc 201236512 At time t5", the voltage Vou has a negative edge indicating that the power switch 1404 is turned off. At time t6", the power switch 1404 is turned off. The time interval (such as 彳t5 to t6) reaches the time threshold Tth_vdd, indicating that the power supply of the terminal VDD drops to yTH_VDD. In one embodiment, in response, low voltage lockout circuit 1504 again sets VALUE_1 510 and VALUE_1 520 to zero. Thus, at time t6, light source 1412 is extinguished. Returning to Figure 15 - dimming controller 1408 can also operate in analog dimming mode to adjust the brightness of light source 1412. In one embodiment, the inverting input of comparator 153 〇 The terminal is coupled to the output of the digital/analog converter 1512, and the inverting input of the comparator 1540 is coupled to the output of the digital/analog converter 1522. Therefore, the reference signals REF1 and REF2 are counted by the counters 1510 and 1520, respectively. The numerical value is determined. Thus, the current peaks transmitted through the light sources LED1 and LED2 are controlled according to the count value to achieve brightness adjustment. Fig. 19 is a flow chart 1900 of a method for adjusting the power source according to an embodiment of the present invention. The description will be made in conjunction with Figures 14A through 18. Although Figure 19 discloses certain specific steps, these steps are merely examples. The present invention is suitable for performing other steps similar or equivalent to those of Figure 19. In step 1902, 'converting electrical energy from The device 141 is transmitted to a light source (such as the light source 1412.) In step 1904, 'the power switch (such as the power switch 1404) that is lightly connected between the power source and the converter 141A is monitored. In 1906, a color change signal is received, and the color change signal indicates a first set of actions of a power switch (such as power switch 1404). In step 1908, the light source is adjusted according to the color change signal (eg, light 078-TW-CH Spec+ Claim (sandra.t-20120201).doc 41 201236512 Source 1412) In step 1910, a dimming request signal is received, the dimming request signal indicating a second set of actions of the power switch. In step 1912, according to dimming The signal is requested to adjust the brightness of the light source. In one embodiment, the monitoring signal is received, and the monitoring signal indicates the conduction state of the power switch. According to the monitoring signal, various actions of the power switch are recognized, including the opening action and the closing action. The time interval identifies the first set of actions and the second set of actions. In one embodiment, the adjustment redundancy # is again a 5 time interval (eg, Tm), or until the dimming termination k number is received. The termination signal indicates a third set of actions of the power switch 14 〇 4. In one embodiment, the source is adjusted by adjusting the count value of the counters (e.g., counters 1522 and 1554). Color and brightness. As mentioned above, the present invention discloses a light source driving circuit for driving an LED light source. The advantage is that the user can select the color of the light source by applying a first set of switching actions to the power switch, and also The power switch applies a second set of switching actions to achieve brightness adjustment. During the brightness adjustment process, the brightness of the light source is gradually increased or decreased. When the LED light source reaches the desired brightness, the user applies a third set of actions to the power switch. To terminate the brightness adjustment, because it avoids the use of additional components (such as the external remote control crying bit is a specially designed switch with dimming button) to adjust the brightness, thereby saving costs. The above-mentioned embodiments and the accompanying drawings are merely exemplary embodiments of the present invention. It is obvious that various additions, modifications and substitutions may be made without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood by those skilled in the art that the present invention can be used in practical applications according to the specific environment and the requirements of 0781 - TW-CH Spec + Claim (sandra.t-20120201 ).doc 42 201236512 without deviating from the hair Under the premise, there are changes in shape, structure, layout, proportion #material, element 'components and other aspects. Therefore, the embodiments of the present invention are to be considered as illustrative and not limiting, and the scope of the invention is defined by the appended claims and their legal equivalents. BRIEF DESCRIPTION OF THE DRAWINGS The technical method of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments to make the features and advantages of the present invention more obvious. Wherein: Figure 1 is a circuit diagram of a conventional LED driving circuit. FIG. 2 is a circuit diagram of another conventional LED driving circuit. Fig. 3 is not an exemplary block diagram of a light source driving circuit in accordance with the present invention. Fig. 4 is a view showing an exemplary circuit of a light source driving circuit according to an embodiment of the present invention. Figure 5 is a diagram showing an exemplary architecture of the dimming controller of Figure 4 in accordance with an embodiment of the present invention. Figure 6 is a diagram showing an exemplary signal waveform in analog dimming mode in accordance with an embodiment of the present invention. Fig. 7 is a diagram showing an exemplary signal waveform in a sudden dimming mode according to an embodiment of the present invention. Figure 8 is a block diagram showing the operation of a light source driving circuit including the dimming controller shown in Figure 5, in accordance with an embodiment of the present invention. Figure 9 is a flow chart showing a method of adjusting power to a light source in accordance with an embodiment of the present invention. Figure 10 is a diagram showing an exemplary circuit diagram of a light source driving circuit 07S1 - TW-CH Spec + C1aim (sandra.t-20120201 ).doc 43 201236512 according to an embodiment of the present invention. Figure U is a diagram showing an exemplary architecture of the dimming controller of Figure 1 in accordance with an embodiment of the present invention. Figure 12 is a block diagram showing the operation of a light source driving circuit including the dimming control H shown in Figure 11 in accordance with an embodiment of the present invention. Figure 13 is a flow chart showing a method of adjusting power to a light source in accordance with an embodiment of the present invention. Figure 14A is a circuit diagram of a light source driving circuit in accordance with an embodiment of the present invention. Figure 14B is a diagram showing the power switch in Figure [alpha], in accordance with one embodiment of the present invention. Figure 15 is a block diagram showing the configuration of the dimming control panel of Figure 14A in accordance with one embodiment of the present invention. Figure 16 is a timing chart showing the operation of a light source driving circuit in accordance with one embodiment of the present invention. Figure Π shows another operational timing diagram of a light source driving circuit in accordance with one embodiment of the present invention. Fig. 18 is a timing chart showing still another operation of the light source driving circuit according to an embodiment of the present invention. FIG. 19 is a flow chart showing a method of adjusting the light source according to an embodiment of the present invention. T _ [Main component symbol description] 100 : LED drive circuit 102 : Power converter 0871 - TW-CH Spec-fClaim (sandra.t-20120201 ).do < 44 201236512 104 : Switch 106 : LED chain 200 : LED drive circuit 208: Linear LED current regulator 210: operational amplifier 300: light source driving circuit 304: power switch 306: AC/DC converter 308: dimming controller 310: power converter 312: LED chain 314: current monitor 400: light source Drive circuit 502: dimmer 504: pulse signal generator 506: trigger monitoring unit 508: start and under voltage lockout (UVL) circuit 510: operational amplifiers 512, 514, 515: metal oxide semiconductor field effect transistor (M0SFET) 516, 518: comparator 520, 522: SR flip-flop 524: and gate 526: counter 528: digital / analog converter 0871 - TW-CH Spec + Claim (sandra.t-20120201).doc 45 201236512 530: pulse Width Modulation Signal Generator 532: Current Source 534: Comparator 536: Pulse Signal 538: Control Signals 540, 54 Bu 542: Switch 602: LED Current 900: Flowchart 902, 904, 906, 908: Step 1000: Light Source Drive Circuit 1008: dimming control 1102: dimmer 1104: clock generator 1106: trigger monitoring unit 1126: counter 1204: negative edge 1206: positive edge 1208: negative edge 1210: positive edge 1300: flowcharts 1302, 1304, 1306, 1308, 1310: Step 1400: Light source driving circuit 1404: power switch 1408: dimming controller 1410: converter 0581-TW-CH Spec+Claim (sandra.t-20120201).doc 46 201236512 1412: light source 1414, 1416: power converter 1450 , 1452 : switch control signal 1480 : button 1502 : start circuit 1504 : low voltage lock circuit 1506 : trigger monitoring unit 1508 : timer 1510 : counter 1512 : digital / analog converter 1514 : pulse width modulation signal generator 1516 : clock Generator 1520: counter 1522: digital/analog converter 1524: pulse width modulation signal generator 1526: clock generator 1530: comparator 1532: SR flip-flop 1534: and gate 1540: comparator 1542: SR positive and negative 1544: and gates 1552, 1554: dimmer 1556, 1558: logic circuit 1560: busbar 0783-TW-CH Spec+Claim (sandra.t-20120201).doc 47 201236512 1900: flow chart 1902, 1904, 1906 , 1908, 1910, 1912: Step 0781 -TW-CH Spec + Claim (sandra.t-20120201) .doc 48