201236497 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明係提供一種節能裝置，尤指一種發光二極體的節 能裝置。 【先前技術】 [0002] 無自發光性質的液晶面板已被廣泛的應用在如電視、電 腦螢幕、行動電話及個人數位助理（PDA)等不同尺寸的液 晶顯示器（LCD )上；而為了達到顯像的目的，必須搭配一 光源以照射該液晶面板，以使該液晶面板對應一影像信 號產生光影變化。由於該光源係多設置至於液晶面板之 後，乃被稱為「背光源」，目前市面上常見之背光源主 要可區分為兩種，其一為使用冷陰極燈管以做為背光源 之光源提供元件，其二為使用發光二極體以作為背光源 之光源提供元件。 [0003] 配合參閱第一圖A，為一習知之背光模組之電路方塊圖。201236497 VI. Description of the Invention: [Technical Field of the Invention] [0001] The present invention provides an energy-saving device, and more particularly to an energy-saving device for a light-emitting diode. [Prior Art] [0002] Liquid crystal panels without self-luminous properties have been widely used in different sizes of liquid crystal displays (LCDs) such as televisions, computer screens, mobile phones, and personal digital assistants (PDAs); For the purpose of the image, a light source must be used to illuminate the liquid crystal panel, so that the liquid crystal panel generates a light and shadow change corresponding to an image signal. Since the light source is disposed behind the liquid crystal panel, it is called a "backlight". Currently, the backlights commonly used in the market can be mainly divided into two types, one of which is to provide a light source as a backlight using a cold cathode lamp. The component, the second of which is a light source providing component using a light-emitting diode as a backlight. [0003] Referring to FIG. A, it is a circuit block diagram of a conventional backlight module.
[0004] 該背光模組80係電連接於交流電源ACV，該背光模組80包 含一交流/直流轉換器82、一驅動單元84及至少一冷陰極 燈管86。該交流/直流轉換器82電連接於該交流電源ACV ，以將該交流電源ACV轉換為一直流電源輸出；該驅動單 元84電連接交流/直流轉換器82及該冷陰極燈管86，該驅 動單元84係接收該直流電壓，並藉以驅動該冷陰極燈管 86，使該冷陰極燈管86產生一光源輸出。 [0005] 但是，隨著液晶顯示器逐漸的薄型化，發光二極體成為 新一代應用於背光模組之光源產生元件。配合參閱第一 圖B，為另一習知之背光模組之電路方塊圖。該背光模組 1002009080-0 100105293 表單編號A0101 第4頁/共15頁 201236497 9〇包含一交流/直流轉換器92、一直流/直流轉換器以及 一發光二極體矩陣5〇，其中該等發光二極體矩陣5〇係由 複數個發光二極體52〇串聯連接組成一發光二極體串列52 ，再由複數個發光二極體串列並聯組成發光二極體矩陣 50 ’如第二圖所示。 [0006] Ο [0007] [0008] Ο 復參閱第一圖Β及第二圖，該交流/直流轉換器92係電連 接於一交流電源ACV，以將該交流電源ACV轉換為—直流 電源輸出至該直流/直流轉換器94。該直流/直流轉換器 94係供升壓或降壓至可以驅動該等發光二極體50之一驅 動電壓VLED。該等發光二極體5〇係接收該驅動電壓 ，同時對應產生一電流ILED，並產生一光源輸出。 然而，由於該等發光二極體5〇於定電壓模式操作下，該 區動電壓VLED係遠大於該等發光二極體5〇導通所需的最 大電壓值，而此多於的電壓係為該背光模組9〇額外的電 源損失。 並且，習知之使用發光二極體作為光源'之背光模組係提 供一預定電壓值（如：12v、24V)予該發光二極體矩陣50 ，但同時驅動該等發光二極體520導通的電壓值並不一定 剛好等於該預定電壓值，且當該預定電壓值大於導通該 等發光二極體的電壓值時，多餘的電壓係增加該交流/直 流轉換器92的電源轉換損耗。 又’由於上述之該背光模組8 〇、9 〇係皆須透過二段式的 電源轉換’即一交流/直流轉換器82、92搭配一驅動單元 84或一直流/直流轉換器94，並且該交流/直流轉換器82 100105293 表單編號A0101 第5頁/共15頁 1002009080-0 [0009] 201236497 、92、該驅動單元84及該直流/直流轉換器94皆具有轉換 效率的損失，致使具有二段式電源轉換之背光模組80、 9 0的使用效率無法有效的提升。 【發明内容】 [0010] 鑒於先前技術所述，本發明之一目的，在於提供一種可 有效地達到節能功能的發光二極體節能裝置。 [0011] 該發光二極體節能裝置，係應用於一發光二極體矩陣之 導通電流及導通電壓的控制，該發光二極體節能裝置係 電連接於一交流電源。 [0012] 該發光二極體節能電路包含一交/直流轉換器、一控制及 回饋單元及一電阻器，該交/直流轉換器電連接於該交流 電源及該發光二極體矩陣，該交/直流轉換器係提供一電 壓輸出。該控制及回饋單元電連接於該交/直流轉換器及 該發光二極體矩陣，用以偵測導通於該發光二極體矩陣 之一導通電流及一導通電壓。該電阻器電連接於該控制 及回饋單元及地端。其中，當該導通電流滿足該發光二 極體矩陣，該控制及回饋單元係回饋一控制信號至該交/ 直流轉換器，使穩定該交/直流轉換器的電壓輸出，以降 低該交/直流轉換器之電源轉換的損耗。 [0013] 本發明之該發光二極體節能裝置係透過該控制及回饋單 元同時地偵測導通於該發光二極體矩陣的導通電壓及導 通電流，並且當該導通電流滿足於該發光二極體矩陣可 以產生最大光強度輸出時，該控制及回饋單元係送出一 控制信號以穩定該交/直流轉換器的輸出電壓，以有效地 降低電源轉換損耗；並且，該發光二極體節能電路只使 100105293 表單編號 A0101 第 6 頁/共 15 頁 1002009080-0 201236497 用單一的電源轉換器（交流/直流轉換器），可有效地避免 先前所述之兩級式電源轉換的能量損耗，進而達到節能 的效果。 [0014] [0015] Ο 【實施方式】 茲有關本發明之技術内容及詳細說明，配合圖式說明如 下： 配合參閱第三圖’為本發明發光二極體節能裝置之方塊 圖。該發光二極體節能裝置10係供連接於至少一發光二 極體矩陣50，該發光二極體節能裝置10係應用於調節該 發光二極體矩陣50的一導通電流ILED及一導通電壓vled 。復參閱第二圖，該發光二極體矩陣50係由真數個發光 二極體520串聯組成一發光二極體串列52，再並聯複數個 發光二極體串列52而形成之一呈矩陣狀排列之發光二極 體矩陣50。 [0016] ❹ [0017] 100105293 該發光二極體520為一種電流驅動之低電壓單向導通元件 ，且該發光二極體520的光亮度係隨著導通於該發光二極 體520的導通電流11^0而#所改變，因此，提供一穩定的 導通電流ILED予該發光二極體矩陣52可有效的使組成該 發光二極體矩陣52之該等發光二極體520的發光亮度達到 一致。 該發光二極體節能裝置10係提供一穩定的導通電流ILED 予該發光二極體陣列50，並且該導通電流ILED係可以使 該發光二極體矩陣10產生最大光亮度；同時地，該發光 二極體節能裝置10係提供驅動同時該等發光二極體520之 一導通電壓VLED，以避免不必要的電源損耗產生，進而 表單煸號A0101 第7頁/共15頁 1002009080-0 201236497 提升整體電路的效率。 闕復參閱第三圖，該發光二極體節能裝置1〇包含一交流/直 流轉換器12、—控制及回饋單元"、一開關單元16及一 電阻器18。β玄乂流/直流轉換器12係電連接於外部的一交 流電源ACV，以將該交流電源ACV轉換為該發光二極體矩 車50適用@ t流電源，並輸出予該發光二極體矩陣 。該交流/直流轉換器12具有一pwM(pulse width m〇d_ ulation)控制單元122，該pwM控制單元122提供一調光 控制信號以控制該發光二極體矩陣5Q之該等發光二極體 5 2 0的亮暗變化。 酬雜制及回饋單元丨4電連接於該交流/直流轉換器i 2、該 發光二極體矩陣50、該開關單元16及該電阻器18，該開 關元件16電連接於該發光二極體矩陣，並經由該電阻 器18接地，其中該開關單元16係為金屬氧化物半導體場 效電晶體（meta卜oxide-semiconductor field-effect transistor， M0SFET)或雙裁子接面 電晶體 (bipolar jUncti〇ri transist〇r BJT)，但不以此為 限，其他可達到相等功效之均等元件皆應包含於本發明 之範疇中。 [0020]該交流/直流轉換器1 2係將該交流電源ACV經轉換後的一 導通電壓VLED傳遞至該發光二極體矩陣5〇，若該直流電 壓大於或等於驅動該發光二極體矩陣5〇之該等發光二極 體520的最小順向電壓，則該等發光二極體52〇導通（即發 光）；同時地，該等發光二極體520導通有一導通電流 ILED。 100105293 表單編號A0101 第8頁/共15頁 1002009080-0 201236497 [0021] [0022] ❹ [0023]The backlight module 80 is electrically connected to an AC power source ACV. The backlight module 80 includes an AC/DC converter 82, a driving unit 84, and at least one cold cathode lamp 86. The AC/DC converter 82 is electrically connected to the AC power source ACV to convert the AC power source ACV into a DC power supply output; the driving unit 84 is electrically connected to the AC/DC converter 82 and the cold cathode lamp 86, the drive Unit 84 receives the DC voltage and thereby drives the cold cathode lamp 86 to cause the cold cathode lamp 86 to produce a light source output. [0005] However, with the gradual thinning of liquid crystal displays, light-emitting diodes have become a new generation of light source generating elements for backlight modules. Referring to FIG. 24B, it is a circuit block diagram of another conventional backlight module. The backlight module 1002009080-0 100105293 Form No. A0101 Page 4 of 15 201236497 9〇 includes an AC/DC converter 92, a DC/DC converter, and a light-emitting diode matrix 5〇, wherein the illumination The diode matrix 5 is composed of a plurality of light-emitting diodes 52 〇 connected in series to form a light-emitting diode series 52, and then a plurality of light-emitting diodes are connected in parallel to form a light-emitting diode matrix 50' as a second The figure shows. [0006] [0007] Referring to the first diagram and the second diagram, the AC/DC converter 92 is electrically connected to an AC power source ACV to convert the AC power source ACV into a DC power source output. To the DC/DC converter 94. The DC/DC converter 94 is boosted or stepped down to drive a driving voltage VLED of one of the LEDs 50. The light-emitting diodes 5 receive the driving voltage, and correspondingly generate a current ILED, and generate a light source output. However, since the light-emitting diodes 5 are operated in a constant voltage mode, the dynamic voltage VLED is much larger than the maximum voltage required for the light-emitting diodes 5 to conduct, and the excess voltage is The backlight module 9 has an additional power loss. Moreover, the conventional backlight module using the light-emitting diode as the light source provides a predetermined voltage value (eg, 12V, 24V) to the light-emitting diode matrix 50, but simultaneously drives the light-emitting diodes 520 to be turned on. The voltage value is not necessarily equal to the predetermined voltage value, and when the predetermined voltage value is greater than the voltage value of the light-emitting diodes, the excess voltage increases the power conversion loss of the AC/DC converter 92. Moreover, since the backlight modules 8 and 9 are all required to be converted by a two-stage power supply, that is, an AC/DC converter 82, 92 is coupled to a driving unit 84 or a DC/DC converter 94, and The AC/DC converter 82 100105293 Form No. A0101 Page 5 / Total 15 pages 1002009080-0 [0009] 201236497, 92, the drive unit 84 and the DC/DC converter 94 all have a loss of conversion efficiency, resulting in two The efficiency of the backlight module 80, 90 of the segment type power conversion cannot be effectively improved. SUMMARY OF THE INVENTION [0010] In view of the prior art, it is an object of the present invention to provide a light-emitting diode energy-saving device that can effectively achieve an energy-saving function. [0011] The light-emitting diode energy-saving device is applied to control of an on-current and a conduction voltage of a light-emitting diode matrix, and the light-emitting diode energy-saving device is electrically connected to an alternating current power source. [0012] The LED energy-saving circuit includes an AC/DC converter, a control and feedback unit, and a resistor electrically connected to the AC power source and the LED matrix. The /DC converter provides a voltage output. The control and feedback unit is electrically connected to the AC/DC converter and the LED matrix for detecting a conduction current and a conduction voltage of the LED matrix. The resistor is electrically connected to the control and feedback unit and the ground. The control and feedback unit feeds back a control signal to the AC/DC converter to stabilize the voltage output of the AC/DC converter to reduce the AC/DC. The loss of power conversion of the converter. [0013] The light-emitting diode energy-saving device of the present invention simultaneously detects a turn-on voltage and a turn-on current that are turned on to the light-emitting diode matrix through the control and feedback unit, and when the turn-on current is satisfied with the light-emitting diode When the body matrix can generate the maximum light intensity output, the control and feedback unit sends a control signal to stabilize the output voltage of the AC/DC converter to effectively reduce the power conversion loss; and the LED energy-saving circuit only Making 100105293 Form No. A0101 Page 6 of 15 1002009080-0 201236497 With a single power converter (AC/DC converter), the energy loss of the previously described two-stage power conversion can be effectively avoided, thereby achieving energy savings. Effect. [0015] [Embodiment] The technical content and detailed description of the present invention will be described below with reference to the following drawings: Referring to FIG. 3 is a block diagram of an energy-saving device for a light-emitting diode of the present invention. The light-emitting diode energy-saving device 10 is connected to at least one light-emitting diode matrix 50, and the light-emitting diode energy-saving device 10 is applied to adjust an on-current ILED and a turn-on voltage vled of the light-emitting diode matrix 50. . Referring to the second figure, the LED matrix 50 is composed of a true number of LEDs 520 in series to form a LED array 52, and a plurality of LED arrays 52 are connected in parallel to form a matrix. Light-emitting diode matrix 50 arranged in an array. [0017] 100105293 The light emitting diode 520 is a current-driven low voltage unidirectional conduction element, and the light brightness of the light emitting diode 520 is related to the conduction current of the light emitting diode 520. 11^0# is changed. Therefore, providing a stable on-current ILED to the LED matrix 52 can effectively achieve the uniform brightness of the LEDs 520 constituting the LED matrix 52. . The light-emitting diode energy-saving device 10 provides a stable on-current ILED to the light-emitting diode array 50, and the conduction current ILED can cause the light-emitting diode matrix 10 to generate maximum brightness; meanwhile, the light emission The diode energy-saving device 10 is provided to drive and simultaneously turn on a voltage VLED of the light-emitting diodes 520 to avoid unnecessary power loss, and then form the nickname A0101 page 7/15 pages 1002009080-0 201236497 The efficiency of the circuit. Referring to the third figure, the LED device 1A includes an AC/DC converter 12, a control and feedback unit, a switch unit 16, and a resistor 18. The β Xuanqi flow/DC converter 12 is electrically connected to an external AC power source ACV to convert the AC power source ACV into the LED body 50 for the @t stream power source, and outputs the LED to the LED. matrix. The AC/DC converter 12 has a pwM (pulse width modulation) control unit 122, and the pwM control unit 122 provides a dimming control signal to control the LEDs 5 of the LED matrix 5Q. 2 0 light and dark changes. The compensation and feedback unit 丨4 is electrically connected to the AC/DC converter i2, the LED matrix 50, the switch unit 16 and the resistor 18. The switch element 16 is electrically connected to the LED The matrix is grounded via the resistor 18, wherein the switching unit 16 is a metal-oxide-semiconductor field-effect transistor (MOSFET) or a bipolar jUncti Ri transist〇r BJT), but not limited thereto, other equivalent elements that achieve equal efficiency should be included in the scope of the present invention. [0020] The AC/DC converter 12 transmits the converted AC voltage of the AC power source ACV to the LED matrix 5〇, if the DC voltage is greater than or equal to driving the LED matrix. The light-emitting diodes 52 are turned on (ie, light-emitting) at the minimum forward voltage of the light-emitting diodes 520; and simultaneously, the light-emitting diodes 520 are turned on to have an on-current ILED. 100105293 Form No. A0101 Page 8 of 15 1002009080-0 201236497 [0021] [0022] ❹ [0023]
[0024] 該交流/直流轉換器1 2之該P W Μ控制單元1 2 0係同時產生 一調光控制信號，該調光控制信號係經由該控制及回饋 單元14傳遞至該開關元件16，藉由導通（turn-on)或截 止（turn-off)該開關元件16，以有效地控制該發光二極 體矩陣5 0之該等發光二極體520的亮暗變化。 該控制及回饋單元14係同時地偵測該交流/直流轉換器1 2 輸出之該導通電壓VLED以及該導通電流ILED。若該導通 電流ILED小於一預定電流，則該控制及回饋單元14係提 供一回饋控制信號以驅使該交流/直流轉換器1 2提升其輸 出的導通電壓VLED，進而提高該導通電流ILED。直至該 導通電流ILED等於該預定電流時，該控制及回饋單元14 係傳遞一控制信號至該交流/直流轉換器12，使穩定該交 流/直流轉換器12之該導通電壓VLED，進而穩定該導通電 流I LED，使該導通電流穩定於一定值而使該等發光二極 體520穩定光亮度的輸出。 當該導通電流ILED大於該預定導通電流，係容易致使該 等發光二極體520損壞，因此，該控制及回饋單元14係傳 遞一回饋控制信號至該交流/直流轉換單元1 2以驅使該交 流/直流轉換器12降低其輸出之導通電壓VLED，以使該導 通電流ILED對應的下降，以避免該等發光二極體520於高 電流操作下損壞。 综合以上所述，本發明之該發光二極體節能裝置10係透 過該控制及回饋單元14同時地偵測導通於該發光二極體 矩陣50的導通電壓VLED及導通電流ILED，並且於該導通 電流ILED滿足該發光二極體矩陣50可以產生最大光強度 100105293 表單編號A0101 第9頁/共15頁 1002009080-0 201236497 輸出時，該控制及回饋單元14係送出一控制信號以穩定 該交/直流轉換器1 2的輸出導通電壓V L E D，如此，藉由即 時地回饋該導通電流ILED以對應地調整該導通電壓VLED ，可以有效地減除不必要的電源轉換損耗；並且，該發 光二極體節能電路只使用單一的電源轉換器（交流/直流 轉換器），可有效地避免先前所述之兩級式電源轉換的能 量損耗，進而達到節能的效果。 [0025] 然以上所述者，僅為本發明之較佳實施例，當不能限定 本發明實施之範圍，即凡依本發明申請專利範圍所作之 均等變化與修飾等，皆應仍屬本發明之專利涵蓋範圍意 圖保護之範疇。 【圖式簡單說明】 [0026] 第一圖A為一習知之光源模組之電路方塊圖。 [0027] 第一圖B為另一習知之光源模組之電路方塊圖。 [0028] 第二圖為發光二極體矩陣之示意圖。 [0029] 第三圖為本發明之發光二極體節能電路之電路方塊圖。 【主要元件符號說明】 [0030] 〈先前技術〉 [0031] 50發光二極體矩陣 [0032] 52發光二極體串列 [0033] 520發光二極體 [0034] 80、90背光模組 100105293 表單編號A0101 第10頁/共15頁 1002009080-0 201236497 [0035] 82、92交流/直流轉換器 [0036] 84驅動單元 [0037] 86冷陰極燈管 [0038] 9 4直流/直流轉換器 [0039] ACV交流電源 [0040] ILED導通電流 [0041] VLED導通電壓 〇 [0042] 〈本發明〉 [0043] 10發光二極體節能裝置 [0044] 12交流/直流轉換器 [0045] 122PWM控制單元 [0046] 14控制及回饋單元 [0047] 1 6開關單元 Ο [0048] 18電阻器 [0049] 50發光二極體矩陣 [0050] 52發光二極體串列 [0051] ACV交流電壓源 [0052] ILED導通電流 [0053] VLED導通電壓 100105293 表單編號A0101 第11頁/共15頁 1002009080-0[0024] The PW Μ control unit 120 of the AC/DC converter 12 simultaneously generates a dimming control signal, and the dimming control signal is transmitted to the switching element 16 via the control and feedback unit 14, The switching element 16 is turned-on or turned-off to effectively control the light-dark variations of the light-emitting diodes 520 of the light-emitting diode matrix 50. The control and feedback unit 14 simultaneously detects the turn-on voltage VLED output by the AC/DC converter 12 and the on-current ILED. If the on current ILED is less than a predetermined current, the control and feedback unit 14 provides a feedback control signal to drive the AC/DC converter 12 to boost its output conduction voltage VLED, thereby increasing the conduction current ILED. Until the on current ILED is equal to the predetermined current, the control and feedback unit 14 transmits a control signal to the AC/DC converter 12 to stabilize the turn-on voltage VLED of the AC/DC converter 12, thereby stabilizing the conduction. The current I LED stabilizes the on-current to a constant value to stabilize the output of the luminance of the light-emitting diodes 520. When the on-current ILED is greater than the predetermined on-current, the light-emitting diodes 520 are easily damaged. Therefore, the control and feedback unit 14 transmits a feedback control signal to the AC/DC conversion unit 12 to drive the communication. The /DC converter 12 lowers the on-voltage VLED of its output to cause a corresponding drop in the on-current ILED to prevent the LEDs 520 from being damaged under high current operation. In summary, the LED energy-saving device 10 of the present invention simultaneously detects the turn-on voltage VLED and the on-current ILED that are turned on the LED matrix 50 through the control and feedback unit 14 and is turned on. The current ILED satisfies the LED matrix 50 to generate maximum light intensity 100105293. Form No. A0101 Page 9/15 pages 1002009080-0 201236497 When outputting, the control and feedback unit 14 sends a control signal to stabilize the AC/DC. The output of the converter 12 is turned on by the voltage VLED. Thus, by instantaneously feeding back the on-current ILED to adjust the on-voltage VLED correspondingly, unnecessary power conversion loss can be effectively reduced; and the light-emitting diode is energy-saving. The circuit uses only a single power converter (AC/DC converter), which effectively avoids the energy loss of the previously described two-stage power conversion, thereby achieving energy savings. [0025] The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention should still belong to the present invention. The patent covers the scope of the intent to protect. BRIEF DESCRIPTION OF THE DRAWINGS [0026] FIG. 1A is a circuit block diagram of a conventional light source module. [0027] FIG. B is a circuit block diagram of another conventional light source module. [0028] The second figure is a schematic diagram of a light emitting diode matrix. [0029] The third figure is a circuit block diagram of the LED energy-saving circuit of the present invention. [Description of Main Component Symbols] [Prior Art] [0031] 50 Light Emitting Diode Matrix [0032] 52 Light Emitting Diodes [0033] 520 Light Emitting Diodes [0034] 80, 90 Backlighting Modules 100105293 Form No. A0101 Page 10 of 15 1002009080-0 201236497 [0035] 82, 92 AC/DC Converter [0036] 84 Drive Unit [0037] 86 Cold Cathode Tube [0038] 9 4 DC/DC Converter [ 0039] ACV AC Power [0040] ILED On Current [0041] VLED On Voltage [0042] <Invention> [0043] 10 LED Energy Saving Device [0044] 12 AC/DC Converter [0045] 122 PWM Control Unit [0046] 14 control and feedback unit [0047] 1 6 switch unit Ο [0048] 18 resistor [0049] 50 light-emitting diode matrix [0050] 52 light-emitting diode series [0051] ACV AC voltage source [0052 ] ILED On Current [0053] VLED On Voltage 100105293 Form No. A0101 Page 11 / Total 15 Page 1002009080-0