201247011 六、發明說明： 【發明所屬之技術領域】 本發明係有關一種LED驅動電路。 【先前技術】 美國專利申請案公開號2011/0025216提出一種寬輸入LED 驅動電路’俾讓一串LED在輸入電壓Vin變動過程中保有 同時點亮的效果。參照圖1 ’這種驅動電路使用橋式整流 器10對交流電源Vac整流產生輸入電壓給第一個電源連接 端Vin和第二個電源連接端GND，電流單元12係電流源 或限流器’連接在第一個電源輸入端Vin和一串LED之間 供應一個固定電流Is給該LED串，二極體Dl、D2及D3 將該LED串分隔成多個LED群組Gl、G2、G3及G4，多 對開關[SW1A，SW1B]、[SW2A，SW2B]及[SW3A，SW3B] 連接一極體Dl、D2及D3的陰極和陽極以及LED群組 G卜G2、G3及G4的輸入端G1I、G2I、G3I及G4I和輸 出端G10、G20、G30及G40 ’控制器14偵測該LED串 的輸入電壓Vs ’根據其大小產生控制信號SW1、SW2及 SW3 控制開關 SW1A、SW1B、SW2A、SW2B、SW3A 及 SW3B，以切換該LED串的組態。當Vs<Vrl時，開關 SWIA、 SW1B、SW2A、SW2B、SW3A 及 SW3B 全部導 通’因此LED群組Gl、G2、G3及G4全部並聯；當 Vrl<Vs<Vr2 時，開關 SW1A、SW1B、SW3A 及 SW3B 切 斷，開關SW2A及SW2B導通，因此LED群組G1和G2 串聯’LED群組G3和G4串聯；當Vs>Vr2時，開關SW1A、 SWIB、 SW2A、SW2B、SW3A 及 SW3B 全部切斷，因此 LED群組G卜G2、G3及G4全部串聯。 圖1的驅動電路使用單一電流單元12，當LED組態中有 多條電流路徑並聯時，不能對各電流路徑單獨驅動，且各 電流路徑會互相影響，因此也不能任意增減某一電流路徑 上的串聯LED數量。為了均分電流is，各電流路徑必須有 201247011 串聯數量的LED，造成應用上缺乏彈性 。使用單一電 H70 i2的另-個糕’係限制LED群組的數量必須是 ^數。此外，電流單元12連接在高壓端Vin，如果使用電 机源來實現的話，電路會比較複雜。 ，然這種_電路想藉切換LED組態來提高LED輸出功 ^卜但實巧上無法達成目的。當LED組態中只有一條電流 杈時，每一個LED的驅動電流都是Is ;當[ED組態中 有兩電流路徑時，每一個LED的驅動電流降為一半 s/2，當LED組態中有四條電流路徑時，每一個LED的驅 ，電流低到只有Is/4。LED的亮度與其電流成正比， 因此不同的LED組態會有差異很大的LED輸出功率。而 且要確保1s被分流後仍足以點亮LEO，Is必須很大。這些 情況在LED群組的數量越多時越嚴重，在某些應用中，甚 至有可能讓分流後的電流低到不足以點亮led。 ，外，圖1的驅動電路係假設所有的LED都具有相同的電 ^特性，但實際上各LED彼此之間存有差異，即使同一批 製造的LED也會有不同的切入電壓(cut_in v〇kage)和電流_ 電壓特性曲線(I-V curve)。在多條電流路徑並聯時，led 彼此之間的變異可能導致各電流路徑的電流分配不平均。 再者，一條電流路徑上有多個LED串聯，其累加起來的切 =電壓總合可能與其他電流路徑有明顯的差異，例如某電 流路徑的切入電壓總合比其他電流路徑低了一個LED的 切入電壓，造成該電流路徑先導通，電壓Vs低到不足以 點亮其他電流路徑的LED。 因為LED的變異’圖1的驅動電路還有應用上的不便之 處。當LED串的數量增減或其中的LED更換後，必須重 ，設定參考電壓Vrl及Vr2，才能確保該驅動電路能正常 操作。例如增加LED串的數量或換上的lED具有較高的 切入電壓時，如果不重新設定適當的參考電壓Vri及Vr2， 將來在切換LED組態時，會因為電壓Vs太小不足以克服 201247011 同一條電流路徑上累加起來的切入電壓總合，造成LED串 無法點亮。 .......·…z 【發明内容】 根據本發明，一種寬輸入LED驅動電路將一個LED串分 隔成多個LED群組，並將渠等LED群組組織成多種LED 組態，每一種LED組態含有一或多條電流路徑，該LED 串的驅動電流係隨著該電流路徑的數量而調整，以保持每一 個該LED群組的電流，因而獲得穩定的LED輸出功率。 在一實施例中，該寬輸入LED驅動電路具有一個可變電流單 元供應該驅動電流。 在一實施例中，該寬輸入LED驅動電路具有多個電流單元， 母一個该電流早元串聯該LED組態的一條電流路徑，以單獨 驅動該電流路徑。201247011 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to an LED driving circuit. [Prior Art] U.S. Patent Application Publication No. 2011/0025216 proposes a wide input LED driving circuit </ RTI> to allow a string of LEDs to simultaneously illuminate during the variation of the input voltage Vin. Referring to FIG. 1 'This driving circuit uses the bridge rectifier 10 to rectify the AC power supply Vac to generate an input voltage to the first power connection terminal Vin and the second power connection terminal GND, and the current unit 12 is a current source or a current limiter' connection. A fixed current Is is supplied between the first power input terminal Vin and a string of LEDs to the LED string, and the diodes D1, D2 and D3 divide the LED string into a plurality of LED groups G1, G2, G3 and G4. , multiple pairs of switches [SW1A, SW1B], [SW2A, SW2B] and [SW3A, SW3B] connect the cathode and anode of the poles D1, D2 and D3 and the input terminal G1I of the LED group G, G2, G3 and G4, G2I, G3I, and G4I and output terminals G10, G20, G30, and G40' controller 14 detects the input voltage Vs of the LED string. The control signals SW1, SW2, and SW3 are generated according to their sizes, and the switches SW1A, SW1B, SW2A, and SW2B are controlled. SW3A and SW3B to switch the configuration of the LED string. When Vs < Vrl, the switches SWIA, SW1B, SW2A, SW2B, SW3A and SW3B are all turned on 'so the LED groups G1, G2, G3 and G4 are all connected in parallel; when Vrl < Vs < Vr2, the switches SW1A, SW1B, SW3A and SW3B is cut off, switches SW2A and SW2B are turned on, so LED groups G1 and G2 are connected in series 'LED group G3 and G4 are connected in series; when Vs>Vr2, switches SW1A, SWIB, SW2A, SW2B, SW3A and SW3B are all cut off, so The LED groups G, G2, G3 and G4 are all connected in series. The driving circuit of Figure 1 uses a single current unit 12. When multiple current paths are connected in parallel in the LED configuration, each current path cannot be driven separately, and each current path affects each other, so that a certain current path cannot be arbitrarily increased or decreased. The number of LEDs in series. In order to share the current is, each current path must have a 201247011 series number of LEDs, resulting in a lack of flexibility in the application. The number of LED groups used to limit the number of LED groups using a single electric H70 i2 must be ^. In addition, the current unit 12 is connected to the high voltage terminal Vin, which is complicated if it is implemented using a motor source. However, this kind of _ circuit wants to improve the LED output by switching the LED configuration. However, it is impossible to achieve the goal. When there is only one current in the LED configuration, the driving current of each LED is Is; when there are two current paths in the ED configuration, the driving current of each LED is reduced to half s/2, when the LED configuration In the case of four current paths, the current of each LED is as low as only Is/4. The brightness of the LED is proportional to its current, so different LED configurations can have very different LED output power. And to ensure that 1s is still enough to light the LEO after being shunted, Is must be large. These conditions are more severe in the number of LED groups. In some applications, it is even possible to make the current after shunting low enough to illuminate the LED. In addition, the driving circuit of Fig. 1 assumes that all the LEDs have the same electrical characteristics, but in fact, the LEDs are different from each other, even if the same batch of LEDs have different cut-in voltages (cut_in v〇 Kage) and current _ voltage characteristic curve (IV curve). When multiple current paths are connected in parallel, variations in the LEDs may cause uneven current distribution across the current paths. Furthermore, there are multiple LEDs connected in series in one current path, and the sum of the combined cut-voltages may be significantly different from other current paths. For example, the total cut-in voltage of a current path is lower than that of other current paths by one LED. The voltage is cut, causing the current path to conduct first, and the voltage Vs is low enough to illuminate the LEDs of other current paths. Because of the variation of LEDs, the driving circuit of Fig. 1 has application inconvenience. When the number of LED strings is increased or decreased or the LEDs therein are replaced, the reference voltages Vrl and Vr2 must be set to ensure that the drive circuit can operate normally. For example, if the number of LED strings is increased or the converted lED has a higher cut-in voltage, if the appropriate reference voltages Vri and Vr2 are not reset, in the future, when switching the LED configuration, the voltage Vs is too small to overcome 201247011. The sum of the cut-in voltages accumulated on one current path causes the LED string to fail to illuminate. According to the present invention, a wide input LED driving circuit divides a LED string into a plurality of LED groups, and organizes LED groups such as channels into a plurality of LED configurations. Each LED configuration contains one or more current paths, and the drive current of the LED string is adjusted with the number of current paths to maintain the current of each of the LED groups, thereby obtaining a stable LED output power. In one embodiment, the wide input LED drive circuit has a variable current unit to supply the drive current. In one embodiment, the wide input LED drive circuit has a plurality of current cells, the current being connected in series with a current path of the LED configuration to drive the current path separately.
【實施方式】 參照圖2 ’ 一種LED驅動電路包括配置器16及驅動器1 連接在第一個電源連接端Vin及第二個電源連接端gni 之間配置益16及驅動盗18之間以·一或多條路徑連接， 其導通的總電流為II。配置器16具有N對LED連接端[G1] G10]到[GNI，GNO]供連接一串LED，n係等於或大於： 的整數，每一對LED連接端[GjI，Gj〇](j=1，2，，n)可連老 至少一個LED於其間，該LED串因而被分隔成>1個1^1 ，組G1到GN，渠等被配置器16組織成多種LED組態 母一種LED組態含有一或多條電流路徑，例如，當 群組G1到GN全部並聯時會有1<[條電流路徑。配置器1( 苎LED、组態的控制也可以切斷某* 群組使並口 ^動器18提供驅動電流11以驅動該LED串，其大4 乂者電流路徑的數量而調整，例如，lED群組G 因而3ft巧二:彳σ，以維持每一個LED群組的電流大小， 因而獲贿疋的LED輸出功率。如果需要的話，配置器κ 5 201247011 也提供信號ISW控制驅動器18，信號ISW含有單一信號 或夕個#號的組合。在+同的實施例中，驅動器.18係連接 在第一個電源連接端Vin及配置器16之間。驅動器18含 有電$單元，如同本技術領域具有通常知識者所熟知的， 電流單元係以電流源或限流器來實現，限流器可用電阻來 實現。在圖2的電路中，驅動器18係連接在低壓端Vin， 若其包含的電流單元係以電流源來實現，則其電路會比 1的電路簡單。 圖3係圖2的苐一實施例，其係以n=4為例。配置器16 包含分離器20、22及24各連接在兩個相鄰的LED群組之 間，路徑模組26連接第一個電源連接端Vin及各LED連 接端 G1I、G10、G2I、G20、G3I、G30、G4I 及 G40， 控制器28連接第一個電源連接端vin。驅動器丨$包含一 個可變電流單元30以單一電流路徑連接路徑模組26，且 受控制器28提供的信號ISW控制而調整驅動電流^，其 大小係隨著LED組態中的電流路徑的數量而改變。分離^ 2〇、22及24使用二極體、開關或其他可連接及切斷連接 的，件。路徑模組26係使用開關、二極體、電阻、電容、 電晶體或其他元件組成的電路，其與分離器2〇、22及24 及LED群組G1到G4共同建立一或多條電流路徑在第一 個電源連接端Vin及可變電流單元30之間。如果路徑模組 26包含開關或其他需要控制的元件，則由控制器烈提供 控制信號PSW，其含有單-錢或多個錢的組合。如果 =離器20、22及24使用開關，則其控制信號也由控制器 28 f供。控制器28可以使用比較器或其他電路來產生控 •^號，這已經是公知技術。在一實施例中，路徑模組％ 圖 1 所示的開關 sw1a、sw1b、SW2a、SW2B、sw3a 及SW3B且如同圖！的配置，信號psw包含圖i所示的 信號sw卜SW2及SW3。在一實施例中，分離器2〇、22 及24使用開關，其控制信號分別為信號s s w2及$ 201247011 的反相信號。在一實施例中，當Vs<Vrl時，LED組態如 圖4'所示，共有4條電流路徑，控制器28根據此電流路徑 的數量控制可變電流單元30供應較大的電流41s，因此每 一個LED群組Gl、G2、G3或G4各分配到電流Is ;當 Vrl<Vs<Vr2時，如圖5所示，電流路徑減少為2條，控制 器28控制可變電流單元30減少電流為2Is，因此每一個 LED仍保有相同的驅動電流Is ;當Vs>vr2時，如圖6所 示，可變電流單元30的電流再減少為is，因此每一個LED 的驅動電流還是保持Is。如此，在每一種LED組態下，皆 可保持穩定的LED輪出功率。因為在各組態下每一條電流 路徑都保持電流Is ’所以可避免驅動能力不足&情況出 現。在另一實施例中，分離器20、22及24使用圖1所示 的二極體Dl、D2及D3，路徑模組26包含圖1所示的開[Embodiment] Referring to FIG. 2, an LED driving circuit includes a configurator 16 and a driver 1 connected between a first power connection terminal Vin and a second power connection terminal gni. Or multiple paths are connected, and the total current that is turned on is II. The configurator 16 has N pairs of LED terminals [G1] G10] to [GNI, GNO] for connecting a string of LEDs, n is an integer equal to or greater than:, each pair of LED terminals [GjI, Gj〇] (j= 1, 2,, n) can be connected with at least one LED in the middle, and the LED string is thus divided into > 1 1 1 , group G1 to GN, and the channel is organized by the configurator 16 into a plurality of LED configuration types. The LED configuration contains one or more current paths, for example, 1<[strip current path] when groups G1 to GN are all connected in parallel. Configurator 1 (苎LED, configured control can also cut off a * group to enable parallel porter 18 to provide drive current 11 to drive the LED string, which is adjusted by the number of current paths, for example, The lED group G thus 3ft is two: 彳σ, in order to maintain the current level of each LED group, thus obtaining the LED output power of the bribe. If necessary, the configurator κ 5 201247011 also provides the signal ISW control driver 18, the signal The ISW contains a single signal or a combination of the ##. In the same embodiment, the driver 18. is connected between the first power connection Vin and the configurator 16. The driver 18 contains the electricity unit, as in the present technology. The field is well known to those skilled in the art, the current unit is implemented as a current source or a current limiter, and the current limiter can be implemented with a resistor. In the circuit of Figure 2, the driver 18 is connected to the low voltage terminal Vin if it contains The current unit is realized by a current source, and the circuit thereof is simpler than the circuit of 1. Fig. 3 is a first embodiment of Fig. 2, taking n=4 as an example. The configurator 16 includes separators 20, 22 and 24 Each connection is between two adjacent LED groups, the road The diameter module 26 is connected to the first power connection terminal Vin and the LED connection terminals G1I, G10, G2I, G20, G3I, G30, G4I and G40, and the controller 28 is connected to the first power connection terminal vin. The drive 丨$ contains one The variable current unit 30 is connected to the path module 26 in a single current path, and is controlled by the signal ISW provided by the controller 28 to adjust the drive current ^, the size of which varies with the number of current paths in the LED configuration. 2, 22, and 24 use diodes, switches, or other components that can be connected and disconnected. Path module 26 is a circuit that uses switches, diodes, resistors, capacitors, transistors, or other components. One or more current paths are established between the first power connection terminal Vin and the variable current unit 30 together with the splitters 2, 22 and 24 and the LED groups G1 to G4. If the path module 26 includes a switch or other If the component needs to be controlled, the controller will provide the control signal PSW, which contains a combination of single-money or multiple money. If the switches 20, 22 and 24 use switches, the control signals are also supplied by the controller 28f. Controller 28 can use a comparator or Other circuits are used to generate the control number, which is already known in the art. In one embodiment, the path module % switches 1 shown in Figure 1 are sw1a, sw1b, SW2a, SW2B, sw3a, and SW3B and are arranged as shown in Figure! Psw includes the signals sw and SW3 shown in Figure i. In one embodiment, the splitters 2, 22, and 24 use switches whose control signals are inverted signals of the signals ss w2 and $ 201247011, respectively. In the example, when Vs < Vrl, the LED configuration is as shown in Fig. 4', there are 4 current paths, and the controller 28 controls the variable current unit 30 to supply a larger current 41s according to the number of the current paths, so each one The LED groups G1, G2, G3 or G4 are each assigned to the current Is; when Vrl < Vs < Vr2, as shown in Fig. 5, the current path is reduced to two, and the controller 28 controls the variable current unit 30 to reduce the current to 2Is. Therefore, each LED still retains the same drive current Is; when Vs > vr2, as shown in Fig. 6, the current of the variable current unit 30 is further reduced to is, so the drive current of each LED remains Is. In this way, stable LED turn-out power can be maintained in each LED configuration. Since each current path maintains the current Is ' in each configuration, it is possible to avoid the insufficient driving capability & In another embodiment, the splitters 20, 22, and 24 use the diodes D1, D2, and D3 shown in FIG. 1, and the path module 26 includes the opening shown in FIG.
關 SW2A 及 SW2B，開關 SW1A、SW1B、SW3A 及 SW3B 的位置各以一個電阻取代，信號PSW只包含單一信號 SW2。 圖7係路徑模組26的另一個實施例，以n=2為例，其包 含電阻R1連接在LED連接端G1I及G2I之間，電阻R2 連接在LED連接端G10及G20之間。此實施例使用二極 體D1作為分離器。當輸入電壓vin還不足以導通6個串 聯的LED時，會建立起兩條電流路徑，一條包含電阻R1 及LED群組G2 ’另一條包含LED群組G1及電阻R2。當 輸入電壓Vin上升到足夠大時，會建立起一條電流路徑從 ^ED群組G1經二極體D1到LED群組G2。信號ISW也. 是根據電壓Vin的大小控制可變電流單元30的電流II的大 小，例如，在兩條電流路徑時的驅動電流是n(2)，一條電 流路彳f時的驅動電流是11(1)，11(2它11(1)。此實施例可以增 加電容C1連接在LED連接端G2I及第二個電源連接端 GND之間’或增加電容C2連接在LED連接端G1I及第二 個電源連接端GND之間，當輸入電壓νΐη下降到較低值 201247011 ?或·02 ΐ以維持LED導通。 的第二實施例，驅動器18包含多個電流單元 政ί;路徑模組32與第二個電源連接端GND之間， Φ二二且A和驅動器18之間有4條電流路徑，LED組態 的节'，流路徑將會串聯一個電流單元12。如果需要 阒》控制态34提供信號PSW控制路徑模組％。圖9係 sw r =i施例’分離器20、22及24分別使用開關 C及SW3C ’路徑模組32包含開關SW1A連 ί Ϊ入1 GU，二極體D4、D5及D6分別連接在開關顯A 二輸入鳊G2I、G3I及G4I之間，開關SW2A連接在輸入 鳊 G1I 與 G3I 之間，開關 swm、SW2B、SW3B 及 sw4 ί別連接在輸出端G1〇、G20、G30及G40與一個電流 單το 12之間。控制器34提供信號SW1、SW2、SW3及 SW4、、、5路徑模纟且32 ,信號5ΤΠ、5TF2及5TF3分別給開關 SW1C > SW2C ^ SW3C 〇 t Vs<Vrl ，LED ^ f〇 所不’ 4條電流路徑各串聯一個電流單元l2 ;當 Vrl<^s<Vr2時’如圖π所示，2條電流路徑各串聯一個 電流單元12 ;當Vs>Vr2時，如圖12所示，LED串只連接 二個電流單元12。在此實施例中，不論在那一種組態下， 每一條電流路徑都有一個電流單元丨2單獨驅動，不^可以 保持穩定的LED輸出功率，而且釋放了應用上的限制。例 如參照圖10,各LED群組的LED串聯數量可以不同，而 且使用者可以增減任一個LED群組中串聯的led數量。 此實施例還可以藉切斷SW1、SW2、SW3或SW4以排除 某些LED群組不點亮，因為每一條電流路徑都有一個電^ 卓元12卓獨驅動，所以不點觉某些LED群組不影塑其他 LED群組。在此實施例中，不但LED的變異因素被排除 了，而且不必要求各電流路徑必須包含相同數量的LED群 組’因此LED串可以被分隔成奇數個LED群組，在某些 組態下，一條電流路徑包含比其他電流路徑更多的LED群 201247011 組 、，*_*» 組導通後，其輸出端的電壓會，反映輪入端的電 W如參照圖13及圖14，在;led導 ϋ接 / t的輸出端電壓VI都會隨著輸人電壓變 =電麗Vs的方式也可以改用偵測電壓= Η可以進一步改良為適應性的參考電壓。例如 3心貞測至ij電壓V1得知LED開始導通時，此時]的以卜 月心ΪΓ足以驅動一個LED群組的跨壓，此時的電壓Vs ”V可用來動態設定參考電屢。如果_個^ 的，聯LED數量有增減’驅動電路可自動調整參J電 伯ϋ’持最佳的效能。债測電壓V1的方式也可^改用 ^ ^的方式。電壓或電流_已經是公知技術。Off SW2A and SW2B, the positions of switches SW1A, SW1B, SW3A and SW3B are each replaced by a resistor, and the signal PSW contains only a single signal SW2. 7 is another embodiment of the path module 26. Taking n=2 as an example, the resistor R1 is connected between the LED terminals G1I and G2I, and the resistor R2 is connected between the LED terminals G10 and G20. This embodiment uses a diode D1 as a separator. When the input voltage vin is not enough to turn on the six serially connected LEDs, two current paths are established, one containing the resistor R1 and the LED group G2' and the other comprising the LED group G1 and the resistor R2. When the input voltage Vin rises sufficiently large, a current path is established from the ^ED group G1 via the diode D1 to the LED group G2. The signal ISW is also controlled according to the magnitude of the voltage Vin. The magnitude of the current II of the variable current unit 30 is, for example, the driving current in the two current paths is n(2), and the driving current in one current path 彳f is 11 (1), 11 (2 it 11 (1). This embodiment can increase the capacitance C1 is connected between the LED connection terminal G2I and the second power connection terminal GND' or increase the capacitance C2 is connected to the LED connection terminal G1I and the second Between the power supply terminals GND, when the input voltage νΐη drops to a lower value 201247011 ? or · 02 ΐ to maintain the LED conduction. In the second embodiment, the driver 18 includes a plurality of current units; the path module 32 and the Between the two power supply terminals GND, Φ 22 and A and the driver 18 have four current paths, the LED configuration section ', the flow path will be connected in series with a current unit 12. If required 阒" control state 34 provides Signal PSW controls the path module %. Figure 9 is sw r = i Example 'Separators 20, 22 and 24 use switches C and SW3C respectively. Path module 32 contains switch SW1A ί Ϊ 1 GU, diode D4 , D5 and D6 are respectively connected between the switch display A two inputs 鳊 G2I, G3I and G4I, and the switch SW2A Between the inputs 1G1I and G3I, the switches swm, SW2B, SW3B, and sw4 are connected between the output terminals G1〇, G20, G30, and G40 and a current single το 12. The controller 34 provides signals SW1, SW2, and SW3. And SW4,,, and 5 path modules and 32, signals 5ΤΠ, 5TF2, and 5TF3 are respectively given to switches SW1C > SW2C ^ SW3C 〇t Vs < Vrl , LED ^ f〇 '4 current paths are connected in series with one current unit l2 When Vrl<^s<Vr2', as shown in Fig. π, two current paths are connected in series with one current unit 12; when Vs > Vr2, as shown in Fig. 12, the LED string is connected to only two current units 12. In this embodiment, in each configuration, each current path has a current unit 丨2 driven alone, which can maintain a stable LED output power and release application limitations. For example, referring to FIG. The number of LEDs connected in series of LED groups can be different, and the user can increase or decrease the number of LEDs connected in series in any one of the LED groups. This embodiment can also eliminate SW1, SW2, SW3 or SW4 to exclude certain LED groups. Does not light because there is one for each current path ^ Zhuo Yuan 12 is uniquely driven, so it is not obvious that some LED groups do not affect other LED groups. In this embodiment, not only the variation of LEDs is eliminated, but also the current paths do not have to contain the same number. The LED group 'so the LED string can be divided into an odd number of LED groups. In some configurations, one current path contains more LED groups than the other current paths 201247011 group, after the *_*» group is turned on, The voltage at the output terminal will reflect the electric power W at the wheel input end. As shown in Fig. 13 and Fig. 14, the voltage VI at the output terminal of the led ϋ / / t can be changed according to the input voltage change = the electric Vs The detection voltage = Η can be further improved to an adaptive reference voltage. For example, when the 3 heart test reaches ij voltage V1 to know that the LED starts to conduct, at this time, the voltage of the moon is enough to drive the voltage across a group of LEDs, and the voltage Vs ”V at this time can be used to dynamically set the reference power. If _ ^ ^, the number of LEDs is increased or decreased 'the drive circuit can automatically adjust the parameters of the J-Electronics' to maintain the best performance. The way to measure the voltage V1 can also be changed to ^ ^. Voltage or current _ It is already a well-known technique.
，圖3或圖8的實施例中，在lED群組G ^式把兩個LED群組G1及G2串聯_測器％，^人 電阻Rt、二極體Dt、電流源It、電晶體Mt ς =，藉偵測器36偵測到的電壓Vtl判斷電壓=In the embodiment of FIG. 3 or FIG. 8, in the lED group G^, two LED groups G1 and G2 are connected in series, and the resistance Rt, the diode Dt, the current source It, and the transistor Mt are connected. ς =, the voltage detected by the detector 36 Vtl determines the voltage =
，，個串聯的LED群組G1&G2，如果電^ ^ 大，則切回原來的led組態，稍後再重霜卜、+，丰_不夠 ^ VS 至I兩個LED群組串聯的組態，然後在經過_段$切^ ，間為t2時，如圖μ所示，嘗試把三個咖群組⑺、 v f 串聯到偵測器36 ’再從偵測到電壓Vt2判斷電壓 =疋否已足夠大，據以決定LED組態。在不同的= ’也可以在時間t2.時嘗試把全部的群組· ^及G4改為串聯’再侧電壓呢判斷電壓％是否已 炎i^決定LED組g。如此難動電路可以不需要 後?切換組態的依據。偵測電壓心 的方式，也可以改㈣測電流的方式。計時的功能# 9 201247011 以使用計時器來實現，健 _h)、記.隱體、數^^考電壓可以使用電容、栓鎖 (ADC)等各比轉換器(DAC)、類比數位轉換器 【圖式簡單說現’這些都已經是公知技術。 圖1係習知的LED驅動電路· 圖2係本發明的實施例； 圖3係圖2的LED驅動雷％ 圖4係圖3的LED驅第-實施例； 圖5係圖3的；lED驅^ Ϊ路產生的一種LED組態 圖6係圖3的LED驅生的-種LED組態 圖7係路魏_另產生的一種LED組態 圖8係圖2的LED驅動#例， 圖9係圖8的LED 2 =的第二實施例； 圖η係圖9的LED驅2路產生的一種led組態； 圖12係圖9的LED驅J :路產生的-種LED組態； 圖13制貞測LED群^^產生的—種哪組態； 圖14係偵測LED群•且 圖15係LED驅動出端電壓的-個實施例； 仙駆動電路§試改變LED組態的示意圖；以及 回係LED驅動電路嘗試改變二印組態的示意圖。 L主要元件符號說明】 10橋式整流器 12 電流單元 14控制器 16配置器 18驅動器 20第一分離器 22 第二分離器 24第三分離器 26 路徑模組 10 201247011 28 控制器 3CT可雙電流單元 32 路徑模組 34 控制器 36 偵測器,, a series of LED groups G1 & G2, if the electric ^ ^ large, then cut back to the original led configuration, later heavy frost, +, Feng _ not enough ^ VS to I two LED groups in series Configuration, and then after the _ segment $ cut ^, between t2, as shown in Figure μ, try to connect three groups of coffee (7), vf to the detector 36 'and determine the voltage from the detected voltage Vt2 =疋 No is large enough to determine the LED configuration. In the case of different = ', it is also possible to change all the groups · ^ and G4 to the series 're-side voltage at time t2. It is judged whether the voltage % has been determined or not. Such a difficult circuit can be used without the need to switch configurations. The way to detect the voltage core can also be changed (4) the way the current is measured. Timing function # 9 201247011 To use the timer to achieve, _h), remember. The hidden body, the number of test voltage can use capacitors, latches (ADC) and other ratio converters (DAC), analog digital converter [The diagram is simple and simple] These are already well-known technologies. 1 is a conventional LED driving circuit. FIG. 2 is an embodiment of the present invention; FIG. 3 is an LED driving laser of FIG. 2. FIG. 4 is a third embodiment of the LED driving of FIG. 3. FIG. Figure 6 shows the LED configuration generated by the LED driving circuit. Figure 6 shows the LED configuration of the LED driver. Figure 7 is a different type of LED configuration. Figure 8 is the LED driver of Figure 2. 9 is a second embodiment of the LED 2 = of FIG. 8; FIG. 11 is a LED configuration generated by the LED driver 2 of FIG. 9; FIG. 12 is a LED configuration of the LED driver J of FIG. 9; Figure 13 shows the configuration of the LED group ^^ which is generated; Figure 14 is the detection LED group • and Figure 15 is the LED driving the output voltage - an embodiment; Schematic; and schematic diagram of the return LED drive circuit attempting to change the second print configuration. L main component symbol description] 10 bridge rectifier 12 current unit 14 controller 16 configurator 18 driver 20 first splitter 22 second splitter 24 third splitter 26 path module 10 201247011 28 controller 3CT dual current unit 32 path module 34 controller 36 detector