201143515 33655twf.d〇c/n 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種照明裝置與其光源控制電路，且 特別是有關於一種發光二極體的照明裝置與其光源控制電 路。 【先前技術】201143515 33655twf.d〇c/n VI. Description of the Invention: [Technical Field] The present invention relates to an illumination device and a light source control circuit thereof, and more particularly to an illumination device for a light-emitting diode and a light source control circuit thereof . [Prior Art]
發光二極體（Light Emitting Diode，簡稱 LED)具有 諸如壽命長、體積小、高抗震性、低熱產生及低功率消耗 等優點’因此已被廣泛應用於家用及各種設備中的指示器 或光源。近年來，發光二極體已朝多色彩及高亮度發展， 因此其應用領域已擴展至大型戶外看板、交通號誌燈及相 關領域。在未來，發光二極體甚至可能成為兼具省電及環 保功能的主要照明光源。 ^ 一般來說，發光二極體的控制電路大多都是將先將交 流電壓轉換成直流電壓或電流，之後再利用穩定的直流^ 壓或電流來控制發光二極體的光源亮度。換而言之，習^知 發光一極體的控制電路大多内嵌一交流/直流轉換琴 (AC-DC converter)，或者是必須搭配一變壓器，才能藉^ 交流的市電來予以控制。然而，上述控制電路的線路^過 於複雜，並且增加應用於大電壓範圍時的成本。此外:亦 可利用串聯電阻的方式來控制發光二極體的光源亮度，作' 此種控制方式的能效太差。 【發明内容】 201143515 33t3^twt.a〇c/n 本發明提供一種光源控制電路，可以應用於大電壓 圍。 24 本發明提供一種照明裝置，可透過簡單的線路提古 源管理的效能。 円光 本發明提出一種光源控制電路，適於驅動相互串聯的 多個第一發光二極體。光源控制電路包括多個開關單元、' 回授單元及控制單元。這些開關單元與這些第一發光二極 體一對一對應，且這些開關單元分別與其對應的第一^ ，極體並_接。回授單元與這些第—發光二極體串^ 系統電壓與接地電壓之間，並提供回授電壓。控制單 接這些關單元與喊單元，控鮮元依獅授電夕 =控制區段選取其―，並據此控制這闕鮮元的導通【 本發明提出另一種照明裝置，包括多個第一發光二 體及光源控制電路。這些第—發光二極體相互串聯 控制電路包衫個關單元、回授單元及控鮮元 = ，關單元與這些第-發光二極體—對—對應，且這些開二 早二分別與其對應的第—發光二鋪並魏.接。回授單 與^•些第-發光二極體串接在系統親與接地電壓 並提供回授電壓。控制單元耦接這些開關單元與 兀’控制單元依據回授電駿多個控繼段選取其—^ 據此控制些開關單元的導通數目。 、 亚 在本發明之-實施例中，當回授電壓大於第— 堡時’控制單元選擇這些控制區段中的第—㈣區段，】 201143515 33635twf.doc/n 控制單元減少這些開關單元的導通數目，以使通過電流的 發光二極體數目增加。 在本發明之一實施例中，當回授電壓大於第二參考電 ，且小於等於第-參考電麟，控卿元選槪些控制區 I又中的第二控制區段，且控制單元維持這些開關單元的導 通數目。並且，控制單元藉由依序位移這些開關單元的導 通狀態來使各個開關單元的平均導通時間相接近，並可使 • 各個發光二極體的平均能源負載相接近。 ，本發明之一實施例中，當回授電壓小於等於第二參 1電壓時，控制單元選擇些這控制區段中的第三控制區 段、’且控制單元增加這些開關單元的導通數目，以使通過 電流的發光二極體數目減少。 在本發明之一實施例中，照明裝置更包括多個第二發 光二極體，所述多個第二發光二極體與這些第一發光二極 體及回授單元串接。 ❿ 基於上述，本發明的照明裝置與其光源控制電路，其 於，一發光二極體串列中的每一顆發光二極體並聯一個開 關單元，並且控制單元依據回授電壓控制每一開關單元導 通與否。藉此，本發明可施加大電壓範圍於發光二極體串 列，並可提高發光二極體的控制效能。並且，由於控制單 元則有多個控制區段，因此可避免回授電壓產生振盪，進 而抑制發光二極體閃燥。 垂^讓本發明之上述特徵和優點能更明顯易懂，下文特 舉貝把例，並配合所附圖式作詳細說明如下。 201143515 3^〇J3twr.aoc/n 【實施方式】 現將詳細參考本發明之實施例，在附圖中說明所述實 施例之實例。另外，凡可能之處’在圖式及實施方式中使 用相同標號的元件/構件/符號代表相同或類似部分。 圖1為依據本發明一實施例的照明裝置的電路示意 圖。請參照圖1 ’在本實施例中，照明裝置50包括串聯的 第一發光二極體Dp^Dn與第二發光二極體LDi-LDx及光源 控制電路100，其中第一發光二極體Dl接收系統電壓 Vcc，並且系統電壓VCc可以為直流或交流，此可依據設 計需求而調整。 光源控制電路100包括控制單元110、回授單元120 及開關單元130_l〜130__n，其中開關單元130_1〜130_n在 此以開關SW广SWn為例。開關別並聯耦接第 一發光二極體Dr^Dn’亦即開關SWi與第一發光二極體 〇ι相互並聯，開關SW2與第一發光二極體D2相互並聯， 其餘則以此類推。回授單元120與第一發光二極體Di-Dn 及第二發光二極體LDHLDX串接在系統電壓Vcc與接地電 壓之間’並提供回授電壓Vf (可視為一回授信號）至控制 單元110 ’其中回授電壓Vf相關於流經回授單元12〇的電 流。 控制單元110耦接開關SWr^SWn’並具有多個控制 區段。控制單元110依據回授電壓Vf選擇多個控制區段的 其中之一，並依據所選擇的控制區段分別控制開關 SW^SWn的導通與否。其中，當開關^▽1〜8111導通時， 201143515 33635twf.doc/n 相互串接的第一發光二極體Di〜Dn會被短路而無法發光。 換言之，當開關SWi導通時，第一發光二極體D】會被短 路而無法發光；當開關導通時’電流會流經第一發 光二極體D〗，進而致使第一發光二極體〇丨得以發光。當 開關SW2導通時’第一發光二極體D2會被短路而無法發 光，當開關SW；2不導通時’電流會流經第一發光二極體 D2 ’進而致使第一發光二極體D2得以發光。並且，依據 上述’第一發光二極體D3〜Dn可分別依據SW3〜SWn的導 通與否而呈現不發光或是發光。藉此，控制單元11〇可透 過控制開關SWpSWn的導通與否，調整第一發光二極體 的串接個數，以調整流經回授單元12〇的電流。 舉例來說，假設控制單元110具有三個控制區段。當 回授電壓Vf大於I·5伏特（即第一參考電壓）時，控制罩 7L 11〇會選擇第一控制區段。當回授電壓小於等於b 伏特且大^ 1伏特（即第二參考電麗）時，控制單元ιι〇 =選擇第二控制區段。當回授電S vf小於1伏特時，控制 疋110會選擇第三控制區段。當控制單元110選擇第一 卉代表流經回授單元120的電流過大，此時應 的串接個數，以降低流經回授 的導通數目（亦P此，控制早70110會減少開關SW1〜swn 進而Μ笛亦p增加開關SW1〜swn中關斷的數目）， 進而增加弟一發朵_ 1 ^ 制單元110可 體D〗〜Dn中發光的數目。其中，控 則，例如依細1?额增加醜關_，或者依據特定規 9加關斷的開關、先奇數後偶數依序增加關 201143515 33635twf.doc/n 斷的開關’且不以此限制本發明的實施例。 當控制單元110選擇第二控制區段時，代表流經回授 單元120的電流為可容許範圍，此時控制單元會維持 開關SWcSWn的導通數目，也就是維持第—發光二極體 中發光的數目。並且，控制單元n〇可藉由依序位 移開關SW〗〜SWn的導通狀態，來致使開關SW1〜SWn的平 均導通時間相接近，並藉此依序位移第—發光二極體 的發光狀態。因此，除了可保持第一發光二極體 A〜Dn中發光的數目，並使第一發光二極體1>1〜1^都有發 光的機會，以此可達到視覺均勻的效果。以㈣為例，假 設開關的狀態在當下為”開關開關關，，，則在下一 個顯示期間可以為”關開關開關”，再來則切換為，，關關開關 開”，其餘則可以此類推，其中”開，，為表示開關的狀態為導 通，”關”為表示開關的狀態為關斷。 抑當控制單元U0選擇第三控制區段時，代表流經回授 單元120的電流過小，此時應降低第一發光二極體Dl〜Dn 的串接個數，以增加流經回授單元12〇的電流。因此，控 制單元110會增加開關SWl〜SWn的導通數目（亦即減少 開關sw〗〜swn中關斷的數目），進而降低第一發光二極 體Di Dn申發光的數目。其中，開關中增加導 通的開關的機制可參照增加關斷的開關的機制，在此則不 再贅述。 另一方面，由於控制單元110是依據回授電壓來調 整第一發光二極體D1〜Dn中發光的數目，因此可透過調整 201143515 33635twf.doc/n 回授單元120所輸出的回授電壓Vf即可調整第一發光二極 體Di〜Dn中發光的數目，以調整第一發光二極體〇1~〇11的 發光功率。並且’由於第一發光二極體中發光的數 目可調整’因此糸統電壓vcc可以使用大電壓範圍。此外， 由於本實施例透過開關SW广SWn調整第一發光二極體Light Emitting Diode (LED) has advantages such as long life, small size, high shock resistance, low heat generation and low power consumption. Therefore, it has been widely used as an indicator or light source in households and various devices. In recent years, light-emitting diodes have developed toward multiple colors and high brightness, so their applications have expanded to large outdoor billboards, traffic lights and related fields. In the future, LEDs may even become the main source of illumination for both power saving and environmental protection functions. ^ Generally speaking, most of the control circuits of the LEDs will convert the AC voltage into a DC voltage or current, and then use a stable DC voltage or current to control the brightness of the light source of the LED. In other words, the control circuit of the light-emitting diode is usually embedded with an AC-DC converter, or it must be matched with a transformer to control it by the AC power. However, the wiring of the above control circuit is complicated and increases the cost when applied to a large voltage range. In addition: the series resistor can also be used to control the brightness of the light source of the LED, so that the energy efficiency of this control method is too poor. SUMMARY OF THE INVENTION 201143515 33t3^twt.a〇c/n The present invention provides a light source control circuit that can be applied to a large voltage range. 24 The present invention provides a lighting device that can improve the performance of ancient source management through a simple circuit. The present invention provides a light source control circuit adapted to drive a plurality of first light emitting diodes connected in series with each other. The light source control circuit includes a plurality of switch units, a 'return unit, and a control unit. The switch units are in one-to-one correspondence with the first light-emitting diodes, and the switch units are respectively connected to the corresponding first and second poles. The feedback unit and these first-light diode strings are connected between the system voltage and the ground voltage, and a feedback voltage is provided. The control unit connects these shutting units and the shouting unit, and the control unit selects the lion according to the lion's power-on-night control section, and controls the conduction of the fresh element according to the present invention. [The present invention proposes another lighting device, including a plurality of first light-emitting devices. Body and light source control circuit. The first-light-emitting diodes are connected in series with each other to control the circuit, the feedback unit, the control unit, and the control unit, and the off unit corresponds to the first-light-emitting diode-pairs, and the two of them are corresponding to each other. The first - luminous two shop and Wei. The feedback order is connected in series with the first-light-emitting diodes in the system and provides the feedback voltage. The control unit is coupled to the switch unit and the 兀' control unit to select the number of conductions of the switch units according to the plurality of control segments of the feedback control unit. In the embodiment of the present invention, when the feedback voltage is greater than the first fort, the control unit selects the (-)th segment of the control segments,] 201143515 33635twf.doc/n control unit reduces the number of these switching units The number of turns is increased to increase the number of light-emitting diodes that pass current. In an embodiment of the present invention, when the feedback voltage is greater than the second reference power and less than or equal to the first reference power, the control unit selects the second control section of the control areas I, and the control unit maintains The number of conduction of these switching units. Moreover, the control unit causes the average on-time of each of the switching units to be close by sequentially shifting the conduction states of the switching units, and the average energy load of each of the light-emitting diodes can be approximated. In an embodiment of the present invention, when the feedback voltage is less than or equal to the second reference voltage, the control unit selects the third control segment of the control segment, and the control unit increases the number of conduction of the switch units. In order to reduce the number of light-emitting diodes that pass current. In an embodiment of the invention, the illumination device further includes a plurality of second light-emitting diodes, and the plurality of second light-emitting diodes are connected in series with the first light-emitting diodes and the feedback unit. ❿ Based on the above, the illumination device of the present invention and its light source control circuit have a switching unit connected in parallel with each of the light emitting diodes, and the control unit controls each switching unit according to the feedback voltage. Turn on or not. Thereby, the present invention can apply a large voltage range to the light-emitting diode series, and can improve the control performance of the light-emitting diode. Moreover, since the control unit has a plurality of control sections, it is possible to avoid oscillation of the feedback voltage, thereby suppressing flashing of the light-emitting diode. The above features and advantages of the present invention will become more apparent and understood from the following description. 201143515 3^〇J3twr.aoc/n [Embodiment] Reference will now be made in detail to the embodiments of the invention, In addition, wherever possible, the same reference numerals and/ BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a circuit diagram of a lighting device in accordance with an embodiment of the present invention. Please refer to FIG. 1 'In the embodiment, the illumination device 50 includes a first LED diode Dp^Dn and a second LED diode LDi-LDx and a light source control circuit 100 connected in series, wherein the first LED diode D1 The system voltage Vcc is received, and the system voltage VCc can be DC or AC, which can be adjusted according to design requirements. The light source control circuit 100 includes a control unit 110, a feedback unit 120, and switch units 130_1 to 130__n, wherein the switch units 130_1 to 130_n are exemplified by the switch SW wide SWn. The switch is coupled in parallel with the first light-emitting diode Dr^Dn', that is, the switch SWi and the first light-emitting diode 〇1 are connected in parallel, and the switch SW2 and the first light-emitting diode D2 are connected in parallel with each other, and so on. The feedback unit 120 is connected in series with the first LED Di-Dn and the second LED LDHLDX between the system voltage Vcc and the ground voltage and provides a feedback voltage Vf (which can be regarded as a feedback signal) to the control. The unit 110' in which the feedback voltage Vf is related to the current flowing through the feedback unit 12A. The control unit 110 is coupled to the switch SWr^SWn' and has a plurality of control sections. The control unit 110 selects one of the plurality of control sections according to the feedback voltage Vf, and controls whether the switch SW^SWn is turned on or not according to the selected control section. When the switches ^1 to 8111 are turned on, the first light-emitting diodes Di to Dn connected to each other in 201143515 33635twf.doc/n are short-circuited and cannot emit light. In other words, when the switch SWi is turned on, the first light-emitting diode D] is short-circuited and cannot emit light; when the switch is turned on, 'current flows through the first light-emitting diode D〗, thereby causing the first light-emitting diode 〇丨 can shine. When the switch SW2 is turned on, the first light-emitting diode D2 is short-circuited and cannot emit light. When the switch SW; 2 is not turned on, the current flows through the first light-emitting diode D2' to cause the first light-emitting diode D2. Can shine. Further, the first light-emitting diodes D3 to Dn can be rendered non-illuminated or light-emitting depending on whether or not the light-emitting diodes D3 to Dn are turned on or off. Thereby, the control unit 11 can adjust the number of series connection of the first light-emitting diodes by controlling the conduction of the switch SWpSWn to adjust the current flowing through the feedback unit 12A. For example, assume that control unit 110 has three control sections. When the feedback voltage Vf is greater than I·5 volts (i.e., the first reference voltage), the control cover 7L 11 〇 selects the first control section. When the feedback voltage is less than or equal to b volts and greater than 1 volt (ie, the second reference voltage), the control unit ιι〇 = selects the second control section. When the feedback power S vf is less than 1 volt, the control unit 110 selects the third control section. When the control unit 110 selects the first plant to represent the current flowing through the feedback unit 120 is too large, the number of connections should be connected in order to reduce the number of conduction through the feedback (also P, control early 70110 will reduce the switch SW1~ Swn and then the flute also increases the number of turns off in the switches SW1~swn), thereby increasing the number of lights in the body D_~Dn. Among them, the control, for example, according to the fine 1 increase the ugly _, or according to the specific regulation 9 plus the shutdown switch, the odd number and the even number sequentially increase the closing switch 201143515 33635twf.doc / n ' and not limited Embodiments of the invention. When the control unit 110 selects the second control section, the current flowing through the feedback unit 120 is an allowable range. At this time, the control unit maintains the conduction number of the switch SWcSWn, that is, maintains the illumination in the first LED. number. Moreover, the control unit n〇 can cause the on-times of the switches SW1 to SWn to be close to each other by sequentially turning on the on states of the switches SW 7-14 SWn, thereby sequentially displacing the illuminating states of the first illuminating diodes. Therefore, in addition to maintaining the number of light-emissions in the first light-emitting diodes A to Dn, and making the first light-emitting diodes 1 > 1 to 1^ have a chance of emitting light, a visually uniform effect can be obtained. Taking (4) as an example, suppose that the state of the switch is "switch switch off at the moment, then it can be "off switch" during the next display, then switch to "off", and the other can be turned on" Where "on" indicates that the state of the switch is on, and "off" indicates that the state of the switch is off. When the control unit U0 selects the third control section, the current flowing through the feedback unit 120 is too small, At this time, the number of series connection of the first light-emitting diodes D1 to Dn should be reduced to increase the current flowing through the feedback unit 12〇. Therefore, the control unit 110 increases the number of conduction of the switches SW1 SWSWn (ie, reduces the switch). Sw 〗 〖Swn in the number of turn off), thereby reducing the number of diodes of the first light-emitting diode Di Dn. Among them, the mechanism of adding a switch to the switch can refer to the mechanism of increasing the switch that is turned off, here is not On the other hand, since the control unit 110 adjusts the number of illuminations in the first LEDs D1 to Dn according to the feedback voltage, it can be adjusted by adjusting the output of the 201143515 33635twf.doc/n feedback unit 120. The feedback voltage Vf can adjust the number of illuminations in the first LEDs Di to Dn to adjust the illumination power of the first LEDs 〇1 to 〇11, and 'because of the illumination in the first LED The number can be adjusted. Therefore, the system voltage vcc can use a large voltage range. In addition, since the present embodiment adjusts the first light-emitting diode through the switch SW wide SWn
Di〜Dn中發光的數目，因此可簡化第一發光二極體d广％ 的控制線路，並據此提升第一發光二極體仏〜^^控制的效 φ 能。 值得一提的是，在本實施例中，回授單元12()為配置 於第二發光二極體1^^與接地電壓之間，但於其他實施例 中，回授單元120可配置於任兩發光二極體之間或配置於 系統電壓Vcc與第一發光二極體Dl之間。並且，在本實 施例中，第一發光二極體D】〜Dn與第二發光二極體 為分開為兩個串列，但於其他實施例中，第一發 光二極體〇1〜〇11與第二發光二極體LDi〜LDx可以交叉串 _ 接此外，雖然本實施例是將第二發光二極體 ，在第-發光二極體如:^訂方，但於其他實施例中， 第一發光二極體LDr^LDx也可配置在第一發光二極體 Di〜Dn的上方、穿插在第一發光二極體D广ο。之中、或是 配置在回授單元12〇與接地電壓之間。其中，當第二發光 了極體LD广LDX配置在第一發光二極體仏〜队的上方時， 系統电虔vcc會先透過第二發光二極體LDi〜LDx產生電屢 差，之後再提供電壓給第一發光二極體Di〜Dn，故有助於 第發光二極體D^Dn的控制。當第二發光二極體 201143515 33635twf.doc/n LD广LDX配置在回授單元12〇與接地電壓之間時，第二發 光二極體L D】與電阻r之間的節點電壓將回傳給控制單^ 11〇，以作為區域性的接地基準點。再者，在實際^用1兀 也可省略第二發光二極體LDi〜LDx。 圖2為依據本發明另一實施例的照明裝置的電路示音 圖。請參照圖2 ’在本實施例中，光源控制電路= 電晶體MHV[n實現開關單元⑽少請』，並且以= 實，回授單元12G。電晶體Μι的没極祕發光二極體& 的陽極’電晶體Μ,的源極耦接第—發光二極體 極’電晶體地的閘極轉接控制單元u〇 : 陽極，電晶體 lno ^u；Z7, 电曰曰股“3 Mn與第一發光二極體 述，在此财在_ 1阻R㈣ n體、、 :凡110會施加向電墨（例如系統電壓Vcc)至要導通的 電晶體的閘極。當要關斷:雷a鍊 4壓控;電晶體Μ! 〜V[為導、甬戈 ~ :、、、 施加至電日日日體M1〜M: 。並且，可透過位移 M—態，靴^_=的=壓達到位移電晶體 在本實施例中，回授電麗t極❹成的狀悲。 及流經電阻流，電阻值 1j透過調整電阻R的電阻值調 201143515 33635twf.doc/n =回授電壓vf的大小。因此’可透_整調整電阻r的 ^且值調整第-發k極體Dl〜Dn中發糾數目，以調整 第一發光一極體D^Dn的發光功率。The number of illuminates in Di~Dn can simplify the control line of the first illuminating diode d, and thereby improve the efficiency of the first illuminating diode 仏~^^ control. It is to be noted that, in this embodiment, the feedback unit 12 is disposed between the second LED and the ground voltage. However, in other embodiments, the feedback unit 120 can be configured. Between any two light-emitting diodes or between the system voltage Vcc and the first light-emitting diode D1. Moreover, in the embodiment, the first LEDs D_Dn and the second LED are separated into two series, but in other embodiments, the first LEDs 〇1~〇 11 and the second light-emitting diodes LDi LD LDx may be cross-connected. Further, although the second light-emitting diode is in the present embodiment, the first light-emitting diode is in the same manner as the first light-emitting diode, but in other embodiments, The first light emitting diode LDr^LDx may also be disposed above the first light emitting diodes Di1 to Dn and interposed in the first light emitting diode D. It is either placed between the feedback unit 12〇 and the ground voltage. Wherein, when the second illuminating body LD is widely disposed above the first illuminating diode 仏 队 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , The voltage is supplied to the first light-emitting diodes Di to Dn, which contributes to the control of the second light-emitting diode D^Dn. When the second light-emitting diode 201143515 33635twf.doc/n LD wide LDX is disposed between the feedback unit 12〇 and the ground voltage, the node voltage between the second light-emitting diode LD and the resistor r is returned to The control unit is 11 〇 as a regional ground reference point. Furthermore, the second light-emitting diodes LDi to LDx may be omitted in practice. 2 is a circuit diagram of a lighting device in accordance with another embodiment of the present invention. Referring to Fig. 2', in the present embodiment, the light source control circuit = transistor MHV [n realizes that the switching unit (10) is small", and returns the unit 12G with =. The transistor of the transistor Μι 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极 极Lno ^u; Z7, electric cymbal "3 Mn and the first illuminating diode, in this _ 1 resistance R (four) n body,: where 110 will apply to the ink (such as system voltage Vcc) to The gate of the transistor is turned on. When it is to be turned off: Thunder a chain 4 voltage control; transistor Μ! ~V [for the conduction, 甬戈~:,,,,,,,,,,,,,,,,,,,, Through the displacement M-state, the pressure of the shoe ^_= reaches the displacement transistor. In this embodiment, the feedback of the electric pole t is formed, and the resistance flows through the resistor, and the resistance value is 1j through the adjustment resistor R. The resistance value is adjusted to 201143515 33635twf.doc/n = the magnitude of the feedback voltage vf. Therefore, the number of corrections can be adjusted by adjusting the value of the first-k electrode D1 to Dn. The luminous power of the light-emitting diode D^Dn.
。雖然上述各個實施湘舉了以單—元件來實現開關 早;^ ’但本發明並不僅以此為限。圖3為依據本發明另一 實施例之開關單元130—1的電路示意圖。請參照圖丄及圖 3,在此僅繪示開料元既丨的電路作為綱，而開關單 元130_2〜130一η的電路可參照開關單元13(u的說明而自 行理解，在此則不再贅述。 在本實施例中，開關單元13(L1包括第一電流源 CS卜第二電流源CS2、開關SI、電晶體⑽、及齊納二 極體(zener diodepD〗。第一電流源CS1提供第一電流l。 第一電流源CS2提供第二電流12，其中第二雷流〗女笛 一電流I】。開關s w i耦接於第一電流源c s i及第二電流源 CS2之間。電晶體]VI】的閘極（即控制端）麵接第—電流 源CS1及開關SWi ’電晶體Μ〗的没極（即第一端）搞接 第發光一極體Di的b極，電晶體Μ!的源極（即第二端） 輕接第一發光二極體Di的陰極。齊納二極體ZD]的陰極 耦接電晶體Mi的閘極，齊納二極體ZD!的陽極麵接電晶 體Mi的源極。 當開關SWi為不導通時，齊納二極體ZD!會受第—電 流I】的影響呈現逆向偏壓，導致電晶體閘極的電壓會 大於其源極的電壓，進而導致電晶體Mi導通。此時，開 關單元130_1也會呈現導通的狀態。另一方面，當開關sWi 11 201143515 33635twf.doc/n ft時么由於第二電流12大於第-電流Ii’故齊納二極 體1為呈現順向偏壓，以將電流匯集至第二電流源 CS:— 相對地’跫到齊納二極體ZD〗$順向偏壓的影響’ 電晶體M]之開極的電壓會小於其源極的電壓，進而導致 電晶體Ml不導通。此時，開關單元130 1也會呈現不導 通的狀態。 — 值得一提的是，在圖3所示的開關單元13〇J[中，開 關SW!並非直接輕接至第一發光二極體，因此控制單 元110可利用小電壓信號來控制開關SWi。換言之，儘管 電晶體的汲極及源極間被施加大電壓，控制單元11〇 依舊可利用小電壓信號來控制電晶體M1的導通與否，進 而控制開關單元130一 1的導通狀態。並且，雖然圖3實施 例中的電aa體M!是以N型電晶體為例，但在其他實施例 中電as體Μι可以為P型電晶體，且此時的齊納二極體 的陽極耦接電晶體的閘極，齊納二極體ZDi的陰極耦 接電晶體Μ:的源極。 綜上所述’本發明實施例的照明裝置與其光源控制電 路’其於發光二極體串列中的每一顆第一發光二極體並聯 一個開關單元，並且控制單元依據回授電壓控制每一開關 單元導通與否。藉此，本發明可施加大電麗範圍於發光二 極體串列，並可透過簡單的線路提高第一發光二極體的控 制效能。並且，由於控制單元具有多個控制區段，因此可 避免回授電壓產生振盪，進而抑制第一發光二極體閃燦。 再者，本發明可透過調整回授電壓（亦即調整電阻的電阻 12 201143515 33635twfdoc/n 值）即可調整第一發光二極體的發光功率。 雖然本發明已以實施例揭露如上，然其並非用以限定 本發明’任何所屬技術領域中具有通常知識者，在不脫離 本發明之精神和範圍内，當可作些許之更動與潤飾，故本 發明之保護範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 • 圖1為依據本發明一實施例的照明裝置的電路示意 圖。 圖2為依據本發明另一實施例的照明裝置的電路示意 圖。 圖3為依據本發明另一實施例之開關單元丨扣」的電 路不意圖。 【主要元件符號說明】 5〇 :照明裝置 100、200 :光源控制電路 110:控制單元 120 :回授單元 130_1〜130_n :開關單元. Although the above various implementations have implemented the switch as a single component, the present invention is not limited thereto. FIG. 3 is a circuit diagram of a switching unit 130-1 according to another embodiment of the present invention. Referring to FIG. 3 and FIG. 3, only the circuit of the open element is shown as the outline, and the circuit of the switch unit 130_2~130-n can be understood by referring to the description of the switch unit 13 (u, but not here) In the present embodiment, the switch unit 13 (L1 includes a first current source CS, a second current source CS2, a switch SI, a transistor (10), and a Zener diode (zener diodepD). The first current source CS1 Providing a first current 1. The first current source CS2 provides a second current 12, wherein the second lightning current is a female current, and the switch swi is coupled between the first current source csi and the second current source CS2. The gate (ie, the control end) of the crystal]VI] is connected to the b-pole of the first light-emitting diode Di, which is connected to the first current source CS1 and the switch SWi 'transistor Μ.源! The source (ie the second end) is lightly connected to the cathode of the first light-emitting diode Di. The cathode of the Zener diode ZD] is coupled to the gate of the transistor Mi, the anode of the Zener diode ZD! The surface is connected to the source of the transistor Mi. When the switch SWi is non-conducting, the Zener diode ZD! is reversely biased by the influence of the first current I]. The voltage of the gate of the transistor will be greater than the voltage of its source, which will cause the transistor Mi to conduct. At this time, the switching unit 130_1 will also be in a conducting state. On the other hand, when the switch sWi 11 201143515 33635twf.doc/n ft Since the second current 12 is greater than the first current Ii', the Zener diode 1 exhibits a forward bias to concentrate the current to the second current source CS: - relatively '跫 to the Zener diode ZD 〗 〖The effect of the forward bias 'The opening voltage of the transistor M' will be less than the voltage of its source, which will cause the transistor M1 to be non-conducting. At this time, the switching unit 130 1 will also be in a non-conducting state. It is worth mentioning that, in the switch unit 13〇J shown in FIG. 3, the switch SW! is not directly connected to the first light-emitting diode, so the control unit 110 can control the switch SWi with a small voltage signal. Although a large voltage is applied between the drain and the source of the transistor, the control unit 11 can still control the conduction of the transistor M1 by using a small voltage signal, thereby controlling the conduction state of the switching unit 130-1. The electric aa in the embodiment of Fig. 3 M! is an example of an N-type transistor, but in other embodiments, the electro-aso can be a P-type transistor, and the anode of the Zener diode is coupled to the gate of the transistor, Zener II. The cathode of the polar body ZDi is coupled to the source of the transistor 。: In summary, the illumination device of the embodiment of the invention and its light source control circuit are each of the first light-emitting diodes in the string of light-emitting diodes. The body is connected in parallel with a switching unit, and the control unit controls whether each switching unit is turned on or not according to the feedback voltage. Thereby, the invention can apply a large battery range to the LED array, and can improve the first through a simple circuit. The control efficiency of the light-emitting diode. Moreover, since the control unit has a plurality of control sections, it is possible to prevent the feedback voltage from oscillating, thereby suppressing the flashing of the first light-emitting diode. Furthermore, the present invention can adjust the luminous power of the first light-emitting diode by adjusting the feedback voltage (that is, adjusting the resistance of the resistor 12 201143515 33635twfdoc/n). The present invention has been disclosed in the above embodiments, and it is not intended to limit the invention to those skilled in the art, and it is possible to make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit diagram of a lighting device in accordance with an embodiment of the present invention. Fig. 2 is a circuit diagram showing a lighting device in accordance with another embodiment of the present invention. Fig. 3 is a circuit diagram of a switch unit snap according to another embodiment of the present invention. [Main component symbol description] 5〇: illumination device 100, 200: light source control circuit 110: control unit 120: feedback unit 130_1~130_n: switch unit
Vcc:系統電壓 vf:回授電壓 D】〜Dn ' LDpLDx :發光二極體 SUI :開關 13 201143515 33635twf.doc/nVcc: system voltage vf: feedback voltage D]~Dn ' LDpLDx : light-emitting diode SUI : switch 13 201143515 33635twf.doc/n
Mi〜Mn :電晶體 R :電阻 CS1、CS2 :電流源 工1、I2 電流 ZDi :齊納二極體Mi~Mn: transistor R: resistance CS1, CS2: current source work 1, I2 current ZDi: Zener diode