M328586 八、新型說明： 【新型所屬之技術領域】 本創作係關於一種發光二極體陣列電路，尤指一種可 均流控制之發光二極體陣列電路。 ^ 【先前技術】 今曰为光模組主要以冷陰極管或發光二極體製作，惟 Φ 由於以發光二極體製作背光模組具有省電、體積小等等優 點，且發光二極體毋需使用冷陰極管所必須使用的汞而得 以減少對於環境的污染，故今日有許多廠商均採用發光二 極體製作背光模組。 請參閱第三圖所示，常見的發光二極體背光模組主要 係由複數個發光二極體燈串（5 0)並聯連接，其中各發 光二極體燈串（5 0 )係由多個發光二極冑（5丄）串聯 連接，且該些發光二極體燈串（5 Q)之―端❹同連接 -輸入電源、（圖t未示），另端則共同連接—均流積體電 路（丨c”60);又常見的均流丨c(6〇)主要係由一 多電晶體電流鏡構成…JT電晶體組成的電流鏡為例， ::广固電晶體的特性必須相同之外，尚必須將每個電晶 月豆操作在主動區内，即是各蘇伞- 疋谷毛先一極體燈串（5 0 )和均 = 60)之間的驅動電慶I必須大於各 在主動區的集極電〜τ)，方可令電流鏡正常運作。 然由於每種發光二極體（51)的順向導通電麼不盡 ㈣’加上各發光二極體燈串（5〇)係共同連接同一輸 M328586 入電源，如此一來將導致該驅動電壓vDs不相同，尤其對 於具有順向導通電壓較大之發光二極體（5 1 )的發光二 極體燈串（5 0 )而言，其與均流丨c ( 6 〇 )之間的電壓 甚至有可能低於電晶體欲操作在主動區的集極電壓 VqAc”，進而使均流ic( 6 0 )内的電流鏡無法正常運作， 導致流過該些發光二極體燈串（5 〇 )電流不盡相同，致 使發光二極體燈串（5 〇 )所發出之光亮度不均。 因此’對於發光二極體背光模組而言，要如何控制令 發光二極體燈串可均流，仍有待進一步之改進方案。 【新型内容】 為此，本創作之主要目的在提供一種可均流控制之發 光一極體陣列電路，其可令流經發光二極體陣列中各發光 一極體之電流維持相同。M328586 VIII. New Description: [New Technology Field] This creation is about a light-emitting diode array circuit, especially a light-emitting diode array circuit with current sharing control. ^ [Prior Art] Today, the optical module is mainly made of cold cathode tube or light-emitting diode, but Φ is made of a light-emitting diode. The backlight module has the advantages of power saving, small size, etc., and the light-emitting diode. There is no need to use the mercury that must be used in cold cathode tubes to reduce environmental pollution. Therefore, many manufacturers today use light-emitting diodes to make backlight modules. Referring to the third figure, the common LED backlight module is mainly connected by a plurality of LED strings (50) in parallel, wherein each LED string (50) is composed of multiple Two light-emitting diodes (5丄) are connected in series, and the light-emitting diode strings (5 Q) are connected to the input power source (not shown), and the other ends are connected together - current sharing The integrated circuit (丨c"60); the common current 丨c(6〇) is mainly composed of a multi-transistor current mirror... the current mirror composed of JT transistor is taken as an example, :: the characteristics of Guanggu crystal In addition to the same, it is necessary to operate each electro-crystal moon bean in the active zone, that is, the drive between the various Su-Umbrellas - Shibuya Mao first pole light string (50) and both = 60) It is greater than the collector current ~τ) in the active area, so that the current mirror can operate normally. However, due to the indirect energization of each of the light-emitting diodes (51), (four) 'plus each light-emitting diode string (5〇) is connected to the same power supply M328586 into the power supply, which will cause the driving voltage vDs to be different, especially for the forward voltage In the case of the light-emitting diode (5 1 ) of the light-emitting diode (5 1 ), the voltage between it and the current-carrying c (6 〇) may even be lower than that of the transistor to be operated in the active region. The collector voltage VqAc", so that the current mirror in the current sharing ic (60) can not operate normally, resulting in different currents flowing through the light-emitting diode strings (5 〇), resulting in a light-emitting diode string (5 〇) The brightness of the light emitted is uneven. Therefore, for the light-emitting diode backlight module, how to control the light-emitting diode string can be evenly distributed, and further improvement is needed. [New content] For this reason, the main purpose of the present invention is to provide a light-emitting diode array circuit capable of current sharing control, which can maintain the same current flowing through each of the light-emitting diodes in the array of light-emitting diodes.
為達成前述目的所採取之主要技術手段係令前述發光 二極體陣列電路，其包括·· X ♦複數發光二極體燈串，各發光二極體燈串係由多個發 光二極體串聯而構成，且各發光二極體燈串具有一電源^ 和-驅動端’纟中該些發光二極體燈串之電源端係—同： 接至一外部電源； 么一均流單元，係具有複數驅動接腳，又該些驅動接腳 係對應連接至該複數發光二極體燈串之驅動端； 電壓補偵模組，係連接於該些發光二極體燈串之電 '、而f忒外部電源之間，又該電壓補償模組係具有複數輸 M328586 入端，該些輸入端係分別連接該均流單元之複數驅動接 腳’以取得任一均流單元之驅動接腳上的回饋電壓，並由 該電壓補償模組判斷該回饋電壓是否低於一基準電壓，若 是，即將取自該外部電源之電壓提高後輸入該些發光二極 體燈串。 上述技術手段主要係藉由該電壓補償模組偵測該均流 單元之複數驅動接腳上的電壓是否夠大，若太小則增加輸 入發光二極體燈串之電壓，藉此提高該均流單元之複數驅 動接腳上的電壓，而得以令該均流單元正常運作，控制八 流經各發光二極體燈串之電流維持均流。 【實施方式】 關於本創作之一較佳實施例，請參閱第一圖所示，係 包括複數發光二極體燈串（丄0 )、一均流單元（2 〇 )'、 以及一電壓補償模組（3 〇 )。 上述複數發光二極體燈串（工〇 )中，各發光二極體 燈串（1 0 )係由多個發光二極體（丄0丄）串聯而構成， 並具有一電源端T1和一驅動端，其中該些發光二極體产 串（1 0 )之電源端T1係一同連接至一外部電源（4 〇 _) 上述均流單元（2 〇 )係具有複數驅動接腳τ2，又兮 些驅動接腳Τ2係對應連接該些發光二極體燈串（1 〇 ^ 之驅動端；於本實施例中，該均流單元（2 〇 )係為一 含有多電晶體電流鏡之均流積體電路（丨c )，其另具有 偏壓接腳Τ3,該偏壓接腳Τ3係透過一偏壓電阻/、 一The main technical means for achieving the foregoing purpose is to enable the above-mentioned light-emitting diode array circuit, which comprises a plurality of light-emitting diode strings, and each light-emitting diode string is connected in series by a plurality of light-emitting diodes. And the light-emitting diode string has a power supply ^ and - drive end '纟 in the power supply terminal of the light-emitting diode string - the same: connected to an external power supply; a plurality of driving pins, wherein the driving pins are correspondingly connected to the driving end of the plurality of LED strings; the voltage compensation module is connected to the LEDs of the LED strings, and f忒Between the external power supplies, the voltage compensation module has a plurality of input terminals M328586, and the input terminals are respectively connected to the plurality of drive pins of the current sharing unit to obtain drive pins of any current sharing unit The feedback voltage is determined by the voltage compensation module whether the feedback voltage is lower than a reference voltage, and if so, the voltage from the external power source is increased and then input to the LED strings. The above technical means mainly detects whether the voltage on the plurality of driving pins of the current sharing unit is large enough by the voltage compensation module, and if it is too small, increases the voltage of the input LED string, thereby improving the average The plurality of flow units drive the voltage on the pins to enable the current sharing unit to operate normally, and control the current flowing through each of the light-emitting diode strings to maintain current sharing. [Embodiment] A preferred embodiment of the present invention, as shown in the first figure, includes a plurality of LED strings (丄0), a current sharing unit (2 〇)', and a voltage compensation. Module (3 〇). In the above composite light-emitting diode string (work), each of the light-emitting diode strings (10) is formed by connecting a plurality of light-emitting diodes (丄0丄) in series, and has a power terminal T1 and a The driving end, wherein the power terminals T1 of the light emitting diode strings (10) are connected together to an external power source (4 〇 _), wherein the current sharing unit (2 〇) has a plurality of driving pins τ2, and The driving pins 2 are connected to the driving diode strings (1 〇 ^ driving end; in this embodiment, the current sharing unit (2 〇) is a current sharing circuit comprising a multi-transistor current mirror The integrated circuit (丨c) further has a biasing pin 3, and the biasing pin 3 is transmitted through a bias resistor/,
Rbias運接 M328586 該外部電源（4 Ο )以取得一偏壓電壓 。 bias 上述電壓補償模組（q ^、在、击4 、3 0 )係連接於該些發光二極體 燈串（1 0 )之電源端T1㈣外部電源（4 〇 )之間， 又該電壓補償模組（3Q)係、具有複數輸人端，該些輸入 端係分別連接該均流單元（2 Q )之複數㈣接腳丁2，以 取得任-均流單元（2 0)之驅動接"上的回饋電壓 vT2，並由該電壓補償模組（3〇)判斷該回饋電壓是否低 ，一基準電壓，若是’即將取自該外部電源、（4 0 )之電 壓提高後輸人該些發光二極體燈串（1Q);又於本實施 例中’該電壓補償模組（3〇)係、包含有一回授輸入單元 —(3 1 ) # 一升壓補償單元（3 2 ) ’而該基準電壓係為 句机單兀（2 0 )内多電晶體電流鏡中電晶體欲操作在主 動區的集極電壓。 上述回授輸入單元（3 1 )係連接該均流單元（2 〇 ) 之複數驅動接腳T2以及該外部電源（4 〇 )，以取得該 均流單元（2 0 )之複數驅動接腳T2上的回饋電壓Vt2 ; 請參閱第二圖所示，於本實施例中，該回授輸入單元（3 1 )係包括： 複數回授二極體DF，其負極係分別連接該均流單元（2 〇 )上的複數驅動接腳丁2，且其導通電壓係為vd; 一第二電阻R2，其一端係連接該些回授二極體df之 正極； 弟 笔阻R1，其一^係連接該外部電源（4 〇 )以 取得一回授參考電壓vREF，而另端則與該第二電阻R2之 M328586 另端連接於一串聯節點； 則此時該串聯節點上的電壓係為 (Vref_Vd-VT2)*[R2/(R1+R2)] + (Vd + VT2)，其中若回饋 電壓vT2越小，則串聯節點上的電壓也就越小。 上述升壓補償單元（3 2 )係連接該外部電源（4 〇 ) 以取得一輸入電壓VIN、一工作電壓vcc和該回授參考電 壓VREF、連接該回授輸入單元（3 1)以及連接該些發光 二極體燈串（1 〇 )之電源端T1，當比較該均流單元（2 〇）之複數驅動接腳T2上的回饋電壓vT2係低於該塞準電 壓時，即將輸入電壓VIN提高後再輸出予該些發光二極體 燈串（1 0 );於本實施例中，該升壓補償單元（3 2 ) 係包括： 係具有一回授參考電 脈寬調變控制器（3 2 壓接腳VREF、一工作電壓接腳VCC、一輸出接腳〇υτ 以及一輸入接腳VFB，並内建有一偏壓單元（3 2 2 )與 一比較器（3 2 3 )，其中該參考電壓接腳VREF和工;|乍 電壓接腳VCC係連接該外部電源（4 〇 )，以分別取得 該工作電壓Vcc和該回授參考電壓Vref，該輸入接腳 係連接該回授輸入單元（3 i )中第一電阻R1和第二電 阻R2之串聯節點，而該偏壓單元（3 2 2 )係連接該回 授參考電壓接腳VREF，以將該回授參考電壓I偏壓轉 換為一參考電M Vref ’該比較器（3 2 3 )之正端輪入係 連接該偏壓單元（3 2 2 )以取得該參考電壓v^負端 輪入係連接該輸入接腳VFB以取得該第一電阻R1筮二 M328586Rbias transports the M328586 to the external power supply (4 Ο) to obtain a bias voltage. The voltage compensating module (q ^, in, 4, 3 0) is connected between the power terminals T1 (4) of the LED strings (10) and the external power source (4 〇), and the voltage compensation The module (3Q) has a plurality of input terminals, and the input terminals are respectively connected to the plurality (four) pins 2 of the current sharing unit (2 Q ) to obtain the drive connection of the any-average unit (20) " the feedback voltage vT2, and the voltage compensation module (3〇) determines whether the feedback voltage is low, a reference voltage, if it is to be taken from the external power supply, (4 0) the voltage is increased and the input is Light-emitting diode string (1Q); in this embodiment, the voltage compensation module (3〇) includes a feedback input unit - (3 1 ) # a boost compensation unit (3 2 ) 'The reference voltage is the collector voltage of the transistor in the multi-transistor current mirror in the multi-transistor current mirror. The feedback input unit (3 1 ) is connected to the plurality of driving pins T2 of the current sharing unit (2 〇) and the external power source (4 〇) to obtain the complex driving pin T2 of the current sharing unit (2 0 ) The feedback voltage Vt2 is shown in the second figure. In the embodiment, the feedback input unit (3 1 ) includes: a plurality of feedback diodes DF, and the negative poles are respectively connected to the current sharing unit ( 2 〇) on the complex drive pin 2, and its turn-on voltage is vd; a second resistor R2, one end of which is connected to the positive electrode of the feedback diode df; the pen resistance R1, one of the system Connect the external power supply (4 〇) to obtain a feedback reference voltage vREF, and the other end is connected to a series node of the M328586 of the second resistor R2; then the voltage on the series node is (Vref_Vd) - VT2) * [R2 / (R1 + R2)] + (Vd + VT2), wherein if the feedback voltage vT2 is smaller, the voltage on the series node is smaller. The boost compensation unit (32) is connected to the external power source (4 〇) to obtain an input voltage VIN, an operating voltage vcc, and the feedback reference voltage VREF, connected to the feedback input unit (3 1), and connected to the The power supply terminal T1 of the light-emitting diode string (1 〇), when the feedback voltage vT2 on the complex drive pin T2 of the current sharing unit (2 〇) is lower than the plug-in voltage, the input voltage VIN is input. After being boosted, the LEDs are outputted to the LED strings (10). In this embodiment, the boost compensation unit (32) includes: a feedback reference electrical pulse width modulation controller ( 3 2 crimping pin VREF, a working voltage pin VCC, an output pin 〇υτ and an input pin VFB, and a biasing unit (3 2 2 ) and a comparator (3 2 3 ) are built therein, wherein The reference voltage pin VREF and the ; voltage pin VCC are connected to the external power source (4 〇) to respectively obtain the operating voltage Vcc and the feedback reference voltage Vref, and the input pin is connected to the feedback input. a series node of the first resistor R1 and the second resistor R2 in the unit (3 i ), and the bias single (3 2 2 ) is connected to the feedback reference voltage pin VREF to convert the feedback reference voltage I bias into a reference power M Vref 'the positive end wheel connection of the comparator (3 2 3 ) a biasing unit (3 2 2 ) to obtain the reference voltage v^ negative terminal is connected to the input pin VFB to obtain the first resistor R1筮2 M328586
電阻R2串聯節點上的分屢，當該第-電阻…和第二電阻 串聯節點上的分壓大於和等於參考電壓、時，該比較 .(3 2 3 )係輸出一低準位信號，此時該脈寬調變控制 器1 )的輸出接腳OUT係輸出一標準脈寬信號， 而當該第-電阻R1和第二電阻R2串聯節點上的分壓小於 參考電塵％時，該比較器（3 2 3 )則輸出—高準位信 號，此時該脈寬調變控制器（3 2 i)的輸出接腳ουτ 係輸出一脈寬較該標準脈寬信號小的信號； 一脈波控制開關Qs，係連接該脈寬調變控制器（3 2 1)，於本實施例中該脈波控制開關〇3係為一接面場效 型电日日體（JFET )，其閘極係連接該脈寬調變控制器（3 2 1 )之輸出接腳〇UT，又該脈波控制開關〇3係依據該 脈寬調變控制器（3 2 i )之輸出信號而開啟和關閉； 一升壓電感L，其一端係連接該外部電源（4 〇 )以 取得輸入電壓vIN，另端則連接該脈波控制開關Qs，於本 實施例中係連接該』FET的源極； 一整流二極體D，其正極係連接該脈波控制開關qs 和升壓電感L，負極則連接該發光二極體燈串（1 〇 )之 電源端T1 ; 一儲能電容C，係連接該整流二極體D之負極和該發 光二極體燈串（1 〇 )之電源端T1，當該脈波控制開關Qs 關閉時，該儲能電容C係開始充電，反之則該儲能電容c 係開始放電，若該第一電阻R1和第二電阻R2串聯節點上 的分壓小於參考電壓Vref，使該脈寬調變控制器（3 2 1 ) M328586 的輸出接腳OUT輸出一脈寬較該標準脈寬信號小的信號， 將令該儲能電纟C之充電時間大於放電時間，因而可對該 發光二極體燈串（10)輸出一較大之電壓。The resistor R2 is connected to the series node. When the voltage divider between the first resistor and the second resistor is greater than or equal to the reference voltage, the comparison (3 2 3 ) outputs a low level signal. The output pin OUT of the pulse width modulation controller 1) outputs a standard pulse width signal, and when the partial pressure on the series node of the first resistor R1 and the second resistor R2 is less than the reference dust percentage, the comparison The device (3 2 3 ) outputs a high-level signal. At this time, the output pin ουτ of the pulse width modulation controller (3 2 i) outputs a signal having a pulse width smaller than the standard pulse width signal; The wave control switch Qs is connected to the pulse width modulation controller (3 2 1). In the embodiment, the pulse wave control switch 〇3 is a junction field effect type electric solar body (JFET), the gate thereof The pole is connected to the output pin UT of the pulse width modulation controller (3 2 1 ), and the pulse wave control switch 〇3 is turned on according to the output signal of the pulse width modulation controller (3 2 i ) Shutdown; a boost inductor L, one end of which is connected to the external power supply (4 〇) to obtain the input voltage vIN, and the other end is connected to the pulse wave control switch Qs, in this embodiment, is connected to the source of the FET; a rectifying diode D, the positive pole of which is connected to the pulse wave control switch qs and the boosting inductor L, and the negative pole is connected to the light emitting diode string ( 1 〇) power supply terminal T1; a storage capacitor C is connected to the negative pole of the rectifier diode D and the power supply terminal T1 of the light-emitting diode string (1 〇), when the pulse wave control switch Qs is turned off The storage capacitor C starts to charge. Otherwise, the storage capacitor c starts to discharge. If the partial pressure on the series node of the first resistor R1 and the second resistor R2 is smaller than the reference voltage Vref, the pulse width modulation control is performed. (3 2 1 ) The output pin OUT of the M328586 outputs a signal with a pulse width smaller than the standard pulse width signal, which will make the charging time of the energy storage device C larger than the discharge time, so that the LED string can be used for the LED string (10) Output a large voltage.
由上述可知，若該均流單元（20)上任一驅動接腳 T2的回饋電壓Vt2變小，將使第一電阻R1和第二電阻r2 之串聯節點上的電壓—同變小，若第_電B R1和第二電 阻R2之串聯節點上的電麼小於參考電壓％時，則該脈 二調變控制器（3 2 I)的輸出接腳〇υτ將會輸出一脈 寬較小的信號，使脈波控制開關Qs開啟的時間較短，而 得以由該儲能電容c輸出較輸人電壓V|n高的電壓予該發 光二極體燈串（1 〇 )，進而使該均流單元（2 〇 )上各 驅動接腳T2的回饋電壓vT2大於電晶體欲操作在主動區的 集極電壓，因而令該均流單& (2Q)可正f運作，藉此 令流經該些發光二極體燈串（工〇 ) i的電流均流，而使 該些發光二極體燈串（i 〇 )得以發出均勻的光。It can be seen from the above that if the feedback voltage Vt2 of any of the driving pins T2 on the current sharing unit (20) becomes smaller, the voltage on the series node of the first resistor R1 and the second resistor r2 becomes smaller, if When the power at the series node of the electric B R1 and the second resistor R2 is less than the reference voltage %, the output pin τ of the pulse two-modulation controller (3 2 I) will output a signal with a small pulse width. The pulse control switch Qs is turned on for a short period of time, and the storage capacitor c outputs a voltage higher than the input voltage V|n to the light-emitting diode string (1 〇), thereby causing the current sharing. The feedback voltage vT2 of each driving pin T2 on the unit (2 〇) is greater than the collector voltage of the transistor to be operated in the active region, so that the current sharing unit & (2Q) can operate positively f, thereby flowing through the The currents of the light-emitting diode strings (work) i are evenly distributed, so that the light-emitting diode strings (i 〇) emit uniform light.
、、不上所述，本創作實為一極具進步性與實用性之佳 作，且未見於刊物或公開使用，符合新型專利之申請要件， 爰依法提出申請。 【圖式簡單說明】 第一圖··係本創作一較佳實施例之電路暨功能方塊 第二圖：係本創作一較佳實施例之實施電路圖。 第二圖·係既有發光二極體陣列電路之電路圖。 10 M328586 【主要元件符號說明】 (ίο)發光二極體燈串 （ (2 0 )均流單元 （ (3 1 )回授輸入單元 （ (3 2 1 )脈寬調變控制器 （ (3 2 3 )比較器 （ (5 0 )發光二極體燈串 （ (6 0 )均流積體電路 101)發光二極體 3 0 )電壓補償模組 3 2 )升壓補償單元 3 2 2 )偏壓單元 4 0 )外部電源 51)發光二極體 (S ) 11As stated above, this creation is a highly progressive and practical work, and it is not found in publications or public use, and meets the requirements for new patent applications. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a preferred embodiment of the present invention. FIG. The second figure is a circuit diagram of an array circuit of a light-emitting diode. 10 M328586 [Key component symbol description] (ίο) LED light string ( (2 0 ) current sharing unit ( (3 1 ) feedback input unit ( (3 2 1) pulse width modulation controller (3 2 3) Comparator ((5 0) light-emitting diode string ((6 0) current-sink circuit 101) light-emitting diode 3) voltage compensation module 3 2) boost compensation unit 3 2 2) Press unit 4 0) external power source 51) light emitting diode (S) 11