M396534 五、新型說明： 【新型所屬之技術領域】 [0001 ] 本新型主要涉及一種電源系統，尤指一種具有背光模·组 的電源系統。 【先前技術】 [_2]電源系統中的發光二極體（Light Emitting Di〇de， 簡稱LED) —般採用外部交流電源驅動使用，而且這種電 源系統通常採用隔離式電源轉換器對外部交流電源與# 電源系統進行隔離。這種電源系統存在成本高、線路復 雜及不能完全隔離等缺點。 【新型内容】 _]有鑑於此，需提供—種電源线，以有效隱驅動發光 二極體的外部交流電源與該電源系統，並降低成本。 闕本㈣·'種實施方式情提供的電«統包括外邹交流 電源、濾波電路、驅動電路及電流平衡電路。該外部交 流電源用於提供外部交流訊號。該濾波電路連接於該外 部父流電源及該驅動電路之間用於接收該外部交流電源 所提供的外部交流訊號並將接收到的外部交流訊號進行 遽波。該驅動電路躲Μ波後的交流訊號轉換為驅動 j號該電源系統還包括背光模組，該背光模組連接於 =動電路及該電流平衡電路之間並包括複數發光二極 :複數導光#，該背光模組根據_動訊號進行點亮 二等導光片包覆該等發光二極體以使該等發光二極^ —外部交流電源隔I該電流平衡電路連接於該背光 表單編號Α0101 第3頁/共9頁 M396534 模組及該驅動電路之間以平衡流經該等發光二極體的電 流。 [0005] [0006] [0007] 優選地，該發光二極體部分包覆於該導光片内。 優選地，該發光—極體全部包覆於該導光片内。 相較於現有技術，本新型的電源系統由於採用外部交流 電源產生交流訊號，利用濾波電路對交流訊號進行濾波 及利用驅動電路提供的驅動訊號對背光模組進行點亮， 並通過背光模組之導光片將發光二極體包覆以隔離發光 二極體與外部交流電源。 【實施方式】 E0008] 請參閱圖1，電源系統包括外部交流電源1 〇、濾波電路2〇 、驅動電路30、電流平衡電路4〇及複數背光模組50。外 部交流電源10用於提供外部交流訊號。濾波電路2〇連接 於外部交流電源1 〇之輸出端及驅動電路30之輸入端之間 ’用於接收該外部交流電源所提供的外部交流訊號並將 接收到的外部交流訊號進行濾波。驅動電路3〇連接於濾 波電路20之輸出端，用於將濾波後的交流訊號轉換為驅 動訊號’該驅動訊號與外部交流電源並無隔離。電流平 衡電路40連接於背光模組5〇及該驅動電路3〇之間。背光 模組50連接於驅動電路3〇之輸出端及電流平衡電路4〇之 間。 請參閱圖2，每個背光模組50包括發光二極體5〇2及導光 片504。背光模組50根據該驅動訊號點亮各發光二極體 502。導光片504以聚曱基丙烯酸曱酯.（P〇lymethyl 表單編號A0101 第4頁/共9頁 [0009] M396534 methacrylate，簡稱PMMA)或者聚碳酸酯（p〇lycar bonate，簡稱PC)為基材並將光線折射成面光源均光狀 態製造成型《根據所使用發光二極體5〇2的外部形狀，將 導光片504製成與發光二極體502形狀相匹配的形狀並將 發光二極體502包覆以使發光二極體502與該外部交汸電 源10隔離。在本實施方式中，發光二極體5〇2部分或者人 部包覆於導光片504内。在其他實施方式中，導光片5〇4 可由濾光片代替。 [0010] 在本實施方式中’電流平衡電路40用於平衡流經發光二 極體502的電流。 [0011] 本新型雖以較佳實施例揭露如上，然其並非用以限定本 新型。惟，任何熟悉此項技藝者，在不脫離本新型之精 神和範圍内，當可做稍許更動與潤飾，因此本新型之保 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】 [0012] 圖1為本新型之電源系統結構圖》 [0013] 圖2為本新型之背光模組之結構圖。 【主要元件符號說明】 [0014] 外部交流電源：1〇 [0015] 濾波電路：20 [0016] 驅動電路：30 [0017] 電流平衡電路：40 [0018] 背光模組：50 表單編號Α0101 第5頁/共9頁 502 502M396534 [0019] 發光二極體： [0020] 導光片：504 表單編號A0101 第6頁/共9頁M396534 V. New Description: [New Technology Field] [0001] The present invention mainly relates to a power supply system, and more particularly to a power supply system having a backlight module and a group. [Prior Art] [_2] Light Emitting Diode (LED) in the power system is generally driven by an external AC power supply, and this power system usually uses an isolated power converter for external AC power. Isolate from the # power system. Such power systems have disadvantages such as high cost, complicated wiring, and incomplete isolation. [New content] _] In view of this, it is necessary to provide a power cord to effectively drive the external AC power of the LED and the power system, and reduce the cost.阙本(4)·'The electric system provided by the implementation method includes the external power supply, filter circuit, drive circuit and current balance circuit. This external AC power supply is used to provide external AC signals. The filter circuit is connected between the external parent current source and the driving circuit for receiving an external AC signal provided by the external AC power source and chopping the received external AC signal. The power circuit of the driving circuit is converted into a driving j. The power system further includes a backlight module. The backlight module is connected between the driving circuit and the current balancing circuit and includes a plurality of light emitting diodes: a plurality of light guiding lights #, the backlight module illuminates the light-emitting diodes according to the _ motion signal to cover the light-emitting diodes to enable the light-emitting diodes to be connected to the backlight form number. Α0101 Page 3 of 9 M396534 The module and the drive circuit balance the current flowing through the LEDs. [0007] [0007] Preferably, the light emitting diode is partially covered in the light guide sheet. Preferably, the light-emitting body is entirely covered in the light guide sheet. Compared with the prior art, the power supply system of the present invention generates an AC signal by using an external AC power source, filters the AC signal by using a filter circuit, and illuminates the backlight module by using a driving signal provided by the driving circuit, and passes through the backlight module. The light guide plate covers the light emitting diode to isolate the light emitting diode from the external AC power source. [Embodiment] E0008] Referring to FIG. 1, the power supply system includes an external AC power supply 1 , a filter circuit 2 , a drive circuit 30 , a current balance circuit 4 , and a plurality of backlight modules 50 . The external AC power source 10 is used to provide an external communication signal. The filter circuit 2 is connected between the output terminal of the external AC power source 1 and the input terminal of the drive circuit 30 for receiving an external AC signal provided by the external AC power source and filtering the received external AC signal. The driving circuit 3 is connected to the output end of the filtering circuit 20 for converting the filtered AC signal into a driving signal. The driving signal is not isolated from the external AC power source. The current balancing circuit 40 is connected between the backlight module 5A and the driving circuit 3A. The backlight module 50 is connected between the output terminal of the driving circuit 3〇 and the current balancing circuit 4〇. Referring to FIG. 2, each backlight module 50 includes a light-emitting diode 5〇2 and a light guide sheet 504. The backlight module 50 lights each of the LEDs 502 according to the driving signal. The light guide sheet 504 is based on poly(fluorene acrylate) (P〇lymethyl form number A0101, page 4/9 pages [0009] M396534 methacrylate, referred to as PMMA) or polycarbonate (p〇lycar bonate, PC for short). The material is refracted into a surface light source and is uniformly formed. According to the outer shape of the light-emitting diode 5〇2, the light guide sheet 504 is formed into a shape matching the shape of the light-emitting diode 502 and the light is emitted. The pole body 502 is coated to isolate the light emitting diode 502 from the external switching power source 10. In the present embodiment, the light-emitting diode 5〇2 portion or the human portion is covered in the light guide sheet 504. In other embodiments, the light guide sheet 5〇4 may be replaced by a filter. [0010] In the present embodiment, the current balancing circuit 40 is for balancing the current flowing through the light emitting diode 502. [0011] The present invention has been described above in terms of preferred embodiments, but is not intended to limit the present invention. However, any person skilled in the art will be able to make minor changes and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this new type is subject to the definition of the patent application scope. BRIEF DESCRIPTION OF THE DRAWINGS [0012] FIG. 1 is a structural diagram of a power supply system of the present invention. [0013] FIG. 2 is a structural diagram of a backlight module of the present invention. [Main component symbol description] [0014] External AC power supply: 1〇[0015] Filter circuit: 20 [0016] Drive circuit: 30 [0017] Current balance circuit: 40 [0018] Backlight module: 50 Form number Α 0101 5 Page / Total 9 pages 502 502M396534 [0019] Light Emitting Diode: [0020] Light Guide: 504 Form No. A0101 Page 6 of 9