M304164 八、新型說明： 【新型所屬之技術領域】 本新型是有關於一種用以驅動led照明設備之電源供 應裝置’特別是指一種具有多路定電流輸出之電源供應裝 置。 【先前技術】 近年來發光二極體（Light Emitting Diode ;以下簡稱 LED)高輝度化及多色化發展的結果，已使得LED逐漸被應 # 用在例如顯示光源、交通燈號、LCD背光及燈具照明等領 域。因此’ LED的驅動方式遂成為該領域爭相研發的重點 舀头種驅動複數LED點燈之LED驅動電路如圖1及 所不，圖1是將複數串接之LED〗i串聯一限流電阻M304164 VIII. New description: [New technical field] The present invention relates to a power supply device for driving a LED lighting device, in particular to a power supply device having a plurality of constant current outputs. [Prior Art] In recent years, as a result of the development of high-luminance and multi-colorization of Light Emitting Diodes (LEDs), LEDs have been gradually used in, for example, display light sources, traffic lights, and LCD backlights. Lighting and other fields. Therefore, the driving mode of LED has become the focus of research and development in this field. The LED driver circuit for driving multiple LED lighting is shown in Figure 1 and Figure 1, and the LED is connected in series with a series current limiting resistor.
電廢VFall(串聯之 通電壓）為已知數Electric waste VFall (connected voltage) is known
、R2的電阻值： D1 Vi η - V r\] =--------- l/· ” —R%Vm-VF 1 / Γ-rx 〇 知一 ----L·.The resistance value of R2: D1 Vi η - V r\] =--------- l/· ” —R%Vm-VF 1 / Γ-rx 〇 Know one ----L·.
M3 04164 的導通電壓有任何變動，即使是微弱的電壓變動都會改變 流經LED的電流，而造成LED亮度不穩定的現象。 【新型内容】 因此，本新型之目的，即在提供一種可對應LED照明 設備之不同LED燈串的導通電壓對應調整輸出電壓以使流 經各LED燈串之電流維持一定值之具有複數定電流輸出之 電源供應裝置。 於是，本新型具有多路定電流輸出之電源供應裝置， 用以驅動複數LED燈串，該電源供應裝置包含一交流/直流 轉換器及複數直流電壓降壓轉換模組。該交流/直流轉換器 用以將交流市電轉成一直流電壓輸出。該等直流電壓降壓 轉換模組分別電性連接該交流/直流轉換器，並各別設有一 用以連接各該LED燈串之連接器，各該直流電壓降壓轉換 模組可根據與其連接之該LED燈串的導通電壓及工作電流 ，對該交流/直流轉換器輸出之直流電壓進行降壓轉換，以 輸出使該LED燈串導通之一降壓直流電壓，並使流經該 LED燈串之工作電流維持一恆定值。 藉此，當各直流電壓降壓轉換模組分別以連接器連接 LED燈串時，可分別針對各自連接之LED燈争的LED導通 電壓變動，對應調整輸出至LED燈串的直流電壓，以提供 恆定之工作電流給LED燈_，而使LED燈串維持穩定的亮 度。 【實施方式】 有關本新型之前述及其他技術内容、特點與功效，在 M3 04164 以下配合參考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 參閱圖3與圖4，是本新型具有多路定電流輸出之電源 供應裝置的一較佳實施例，其主要是應用在LED照明裝置 中，用以驅動LED點燈。本實施例之電源供應裝置j⑽主 要包含一交流/直流轉換器〗以及用以驅動複數LED燈串3 之複數直流電壓降壓轉換模組2。其中LED燈串3 ^以如 圖5所不之串聯方式或圖6所示之並聯方式形成。There is any change in the turn-on voltage of M3 04164. Even a weak voltage change will change the current flowing through the LED, causing the LED brightness to be unstable. [New content] Therefore, the purpose of the present invention is to provide a plurality of constant currents corresponding to the on-voltage of different LED strings that can correspond to LED lighting devices, so as to adjust the output voltage so that the current flowing through each LED string maintains a certain value. Output power supply unit. Therefore, the novel power supply device with multiple constant current outputs is used for driving a plurality of LED light strings, and the power supply device comprises an AC/DC converter and a plurality of DC voltage step-down conversion modules. The AC/DC converter is used to convert the AC mains to a DC output. The DC voltage step-down conversion modules are respectively electrically connected to the AC/DC converter, and each has a connector for connecting each LED string, and each of the DC voltage step-down conversion modules can be connected thereto. The ON voltage and the operating current of the LED string are step-down converted to the DC voltage outputted by the AC/DC converter to output a step-down DC voltage that turns the LED string on and through the LED lamp. The operating current of the string is maintained at a constant value. Therefore, when each DC voltage step-down conversion module is connected to the LED light string by the connector, respectively, the LED ON voltage of the respective connected LED lamps can be respectively changed, and the DC voltage output to the LED string is adjusted correspondingly to provide A constant operating current is given to the LED lamp _, which maintains a stable brightness of the LED string. [Embodiment] The foregoing and other technical contents, features and effects of the present invention will be apparent from the following detailed description of a preferred embodiment of the accompanying drawings. Referring to Figures 3 and 4, a preferred embodiment of the power supply apparatus having a multi-channel constant current output is mainly used in an LED lighting device for driving LED lighting. The power supply device j (10) of this embodiment mainly includes an AC/DC converter and a plurality of DC voltage step-down conversion modules 2 for driving the plurality of LED strings 3. The LED string 3 ^ is formed in a series mode as shown in Fig. 5 or in a parallel manner as shown in Fig. 6.
交流/直流轉換器1與提供交流電源之市電5連接，用 以將市電5轉成-直流電壓Vi輸出（本實施例以輪出㈣ 直流電壓為例)，|由於交流/直流_ !是一習知電路且 非本案重點，在此不予詳述。 々v '又丨L ’且 轉換哭 之輪出端並聯，並且各別設有一用以連接 、二 拉哭m Ύ 3 -〇。直流電壓降壓轉換模組2可根據㈣燈串3所X =電壓及工作電流’對交流/直流轉換器〗輸出之直: ::1進行降壓轉換，以對應輸出相當於咖燈 〜）⑼電麼vF的降塵直流電愿v〇^led燈串3， 經咖燈串3之工作電流—維持_恆定值。且二： :流電塵降壓轉換模、组2之作用相同，因此：該’ 。、中i流電壓降壓轉換模組2之細部電路及其作動方式 如圖4所示， 波寬度調變）控制器 直流電壓降壓轉換模組2包括一 2】，一連接在pwm控制器21 PWM (脈 與連接器 M3 04164 20之間的濾波電路22，以及一連接在連接器20與PWM控 制器21之間的回授電路23。其中PWM控制器21是使用 ON Semiconductor生產之型號MC34063積體電路，其詳細 電路如圖7所示，且由於PWM控制器21之細部電路作動 是一習知技術，於此不加詳述。 PWM控制器21與交流/直流轉換器1之輸出端連接， 接受直流電壓Vi輸入，並根據回授電路23產生之一回授電 壓Vfb，對應產生一 PWM訊號210輸出。 濾波電路22由一電感L、一電容C及一二極體D串聯 構成，用以對PWM控制器21輸出之PWM訊號210進行 濾波以產生降壓直流電壓Vo輸出至LED燈串3。回授電路 23是由兩個並聯的電阻Rl、R2構成，且電阻Rl、R2之電 阻值是根據PWM控制器21内部之一參考電壓（1·25 V)以及 LED燈串3之工作電流ILED而決定，亦即，以圖5為例， 若11£〇為2〇111八’貝1】電阻值（1^1//1^2)：=].25\7/1[]£〇。 因此，當PWM控制器21輸出之PWM訊號210經過 濾波電路22濾波產生之降壓直流電壓Vo不等於LED燈串 3之（總）導通電壓VF，而使得流經LED燈串3之電流不等 於工作電流時，回授電壓Vfb將不等於PWM控制器21之 參考電壓（1.25V)，而促使PWM控制器21改變輸出之PWM 訊號的工作周期，直到濾波電路22產生之降壓直流電壓Vo 使得回授電壓Vfb等於I.25V時，PWM控制器21即輸出 一穩定的PWM訊號210，使濾波電路22產生一相當於 LED燈串2之（總）導通電壓VF的降壓直流電壓Vo，而使得 M3 04164 流經哪7 3的工作電流^維持一值定值。 、01此备各直流電壓降壓轉換模組2分別以連接器2〇 連接LED k串3時，可分別針對各自連接之LED燈串3的 ^電㈣動，對應調整輸出至LED燈串3的直流電M V0 ^ 1、良疋之工作電流1LED、給LED燈串3，使LED燈串3 維持穩定的亮度。 ^I本新型具有多路定電流輸出之電源供應裝 ED…、明叙置内時’藉由在交流/直流轉換器η之 =端並聯複數直流電料麼轉換模組2,可供複數㈣ 且3對應連接，以對應驅動各led燈串2點燈，並達到 提供恆定電流輸出以穩定LED亮度之功效與目的。 a、惟以上所述者，僅為本新型之較佳實施例而已，當不 匕乂此限疋本新型實施之範圍，即大凡依本 ，新型說明内容所作之簡單的等效變化與修飾= 蜀本新型專利涵蓋之範圍内。 【圖式簡單說明】 圖1顯示習知一種串聯LED之點燈驅動電路； 圖2頒示習知一種並聯LED之點燈驅動電路； 圖3顯示本新型具有多路定電流輸出之電源供應裝置 的車父隹實施例之電路方路圖； 細部電 圖4顯示本實施例之直流電壓降壓轉換模組的 路； 圖5顯示本實施例之led燈串之一連接方式； 圖6顯示本實施例之LED燈串之另一連接方式；及 M3 04164 圖7顯示本實施例之PWM控制器21的内部電路。The AC/DC converter 1 is connected to the commercial power supply 5 that supplies AC power to convert the commercial power 5 into a DC voltage Vi output (this embodiment takes the turn-off (four) DC voltage as an example), | because AC/DC_ is a The conventional circuit is not the focus of this case and will not be described in detail here. 々v '又丨L ’ and the switch to the end of the crying wheel is connected in parallel, and each has one for connecting, two for crying m Ύ 3 -〇. The DC voltage step-down conversion module 2 can be based on (4) the light string 3 X = voltage and the operating current 'to the AC / DC converter〗 output straight: ::1 to step down conversion, corresponding to the output equivalent to the coffee light ~) (9) Electricity vF's dust-collecting DC power is willing to v〇^led light string 3, the working current of the string of coffee lights 3 - maintain _ constant value. And two: : the flow of electricity dust step-down conversion mode, the role of group 2 is the same, therefore: the '. The detailed circuit of the i-stream voltage buck conversion module 2 and its actuation mode are shown in Figure 4. The wave width modulation controller DC voltage buck conversion module 2 includes a 2], a connection to the pwm controller 21 PWM (filter circuit 22 between the pulse and connector M3 04164 20, and a feedback circuit 23 connected between the connector 20 and the PWM controller 21. The PWM controller 21 is a model MC34063 manufactured by ON Semiconductor. The integrated circuit, the detailed circuit is shown in Figure 7, and because the detailed circuit operation of the PWM controller 21 is a conventional technique, it will not be described in detail here. The output of the PWM controller 21 and the AC/DC converter 1 Connected, receives the DC voltage Vi input, and generates a feedback signal Vfb according to the feedback circuit 23, correspondingly generates a PWM signal 210. The filter circuit 22 is composed of an inductor L, a capacitor C and a diode D connected in series. The PWM signal 210 outputted by the PWM controller 21 is filtered to generate a step-down DC voltage Vo output to the LED string 3. The feedback circuit 23 is composed of two parallel resistors R1 and R2, and the resistors R1 and R2 are The resistance value is based on the PWM controller 21 The reference voltage (1·25 V) and the operating current ILED of the LED string 3 are determined, that is, as shown in Fig. 5, if 11 〇 is 2 〇 111 八 'Bei 1] resistance value (1^ 1//1^2):=].25\7/1[]£〇 Therefore, when the PWM signal 210 outputted by the PWM controller 21 is filtered by the filter circuit 22, the step-down DC voltage Vo is not equal to the LED string. The (total) turn-on voltage VF of 3, such that when the current flowing through the LED string 3 is not equal to the operating current, the feedback voltage Vfb will not be equal to the reference voltage (1.25 V) of the PWM controller 21, causing the PWM controller 21 Changing the duty cycle of the output PWM signal until the step-down DC voltage Vo generated by the filter circuit 22 causes the feedback voltage Vfb to be equal to 1.25V, the PWM controller 21 outputs a stable PWM signal 210, so that the filter circuit 22 generates a It is equivalent to the step-down DC voltage Vo of the (total) turn-on voltage VF of the LED string 2, so that the operating current of the M3 04164 flows through the sustaining value of a constant voltage. When the group 2 is connected to the LED k string 3 by the connector 2, respectively, the corresponding electric power (four) movement of the LED string 3 connected to each other can be adjusted correspondingly. The DC current M V0 ^ 1 to the LED string 3, the working current 1 LED of the Liangzhu, and the LED string 3 ensure that the LED string 3 maintains a stable brightness. ^I This new type of power supply with multiple constant current output ED ..., when the inside of the set is inside, 'by the AC/DC converter η = end parallel multiple DC power conversion module 2, for multiple (four) and 3 corresponding connection, to drive each led light string 2 lights, And to achieve the effect and purpose of providing a constant current output to stabilize the brightness of the LED. a, but the above is only the preferred embodiment of the present invention, and is not limited to the scope of the present invention, that is, the simple equivalent change and modification of the new description content. Within the scope of this new patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a conventional lighting driving circuit for a series LED; FIG. 2 shows a conventional lighting driving circuit for a parallel LED; FIG. 3 shows the power supply device with multi-channel constant current output. The circuit diagram of the circuit diagram of the embodiment of the vehicle; the detailed circuit diagram 4 shows the circuit of the DC voltage step-down conversion module of the embodiment; FIG. 5 shows the connection mode of the LED string of the embodiment; Another connection mode of the LED light string of the embodiment; and M3 04164 FIG. 7 shows the internal circuit of the PWM controller 21 of the present embodiment.
10 M3 04164 【主要元件符號說明】 100 電源供應裝置 Vi 直流電壓 1 交流/直流轉換器 Vo 降壓直流電壓 2 直流電壓降壓轉換模 Iled 工作電流 組 Vfb 回授電壓 3 LED燈串 VF LED導通電壓 5 市電 L 電感 20 連接器 C 電容 21 PWM控制器 D 二極體 22 濾波電路 R1、 R2 電阻 23 回授電路 210 PWM訊號10 M3 04164 [Main component symbol description] 100 Power supply device Vi DC voltage 1 AC/DC converter Vo Buck DC voltage 2 DC voltage step-down conversion mode Iled Operating current group Vfb Feedback voltage 3 LED string VF LED turn-on voltage 5 mains L inductor 20 connector C capacitor 21 PWM controller D diode 22 filter circuit R1, R2 resistor 23 feedback circuit 210 PWM signal