201123987 六 [0001] [0002] [0003] [0004] [0005] [0006] 發明說明： - 【發明所屬之技術頜威】 本發明涉及一種旁路保護電路及使用其的發光二極體驅 動裝置。 [先前技術] 由於具有低能耗、南光效、使用壽命長等諸多優點，發 光二極體（Light Emitting Diode ’ LED)光源正逐漸 取代傳統光源而被照明燈具、背光源所使用。 通常，LED背光源具有複數LED燈串，且每個LED燈串具 〇 有複數LED燈串聯在一起，同時作用照亮面板。但是串聯 在一起的LED燈存在如下缺點:：當其中'一個LED燈發生損 壞而斷開時，與之串聯的其他LE0燈也將隨著熄滅，這就 降低LED光源的工作可靠度。 【發明内容】 有鑒於此，需提供一種旁路保護電路，為發光二極體提 供旁路支路，使其具有較高的可靠性。, 〇 還需提供一種使甩旁路保護電路的發光二極體驅動裝置 ’為發光二極體提供旁路支路，具有較高的可靠性。 本發明具體實施方式中的一種旁路保護電路，與發光二 極體（Light Emitting Diode，LED)燈組並行連接， 該LED燈組包括複數同向串聯的led燈，且該等同向串聯 的LED燈兩端具有公共陽極與公共陰極。其中，開關電路 包括複數開關元件、異常偵測模組及開關控制模組。每 個開關元件對應與一個LED燈並聯，當異常偵測模組偵測 098144344 表單編號A0101 第4頁/共17頁 0982075802-0 201123987 到某一UD燈斷路時輪“常訊號，開_制模組根據該 異常訊號控制與斷路並聯的開關元件開啟，從而提供旁 路保護。電谷與上述⑽燈並行連接，當·燈於正常工 作模式與脈義光模狀•㈣，其驅動電訊號對電 谷進订充電’且給開關電路提供工作電源；當LED燈於脈 衝調光Μ式第二狀態時，電容放電用以維持開關電路的 工作電源。 [0007] ΟBACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bypass protection circuit and a light-emitting diode driving device using the same . [Prior Art] Due to its low power consumption, south light efficiency, long service life and many other advantages, Light Emitting Diode (LED) light sources are gradually replacing traditional light sources and used by lighting fixtures and backlights. Typically, an LED backlight has a plurality of LED strings, and each LED string has a plurality of LEDs connected in series to simultaneously illuminate the panel. However, the LED lamps connected in series have the following disadvantages: When one of the LED lamps is broken and disconnected, the other LE0 lamps connected in series will also go out, which reduces the operational reliability of the LED light source. SUMMARY OF THE INVENTION In view of the above, it is desirable to provide a bypass protection circuit that provides a bypass branch for a light-emitting diode to provide high reliability. , 〇 It is also necessary to provide a light-emitting diode driving device for the bypass protection circuit to provide a bypass branch for the light-emitting diode, which has high reliability. A bypass protection circuit in a specific embodiment of the present invention is connected in parallel with a Light Emitting Diode (LED) lamp group, the LED lamp group includes a plurality of LED lamps connected in the same direction, and the LEDs in the same direction are connected in series Both ends of the lamp have a common anode and a common cathode. The switch circuit includes a plurality of switching elements, an abnormality detecting module and a switch control module. Each switching element corresponds to an LED lamp in parallel, when the abnormality detecting module detects 098144344 Form No. A0101 Page 4 / Total 17 pages 0982075802-0 201123987 When a certain UD lamp is disconnected, the wheel "normal signal, open_module" The group controls the opening and closing of the switching element in parallel according to the abnormal signal to provide bypass protection. The electric valley is connected in parallel with the above (10) lamp, and when the lamp is in the normal working mode and the pulse light mode (4), the driving signal is electrically connected. The valley feeds the charging and provides the working power to the switching circuit; when the LED is in the second state of the pulse dimming mode, the capacitor discharge is used to maintain the operating power of the switching circuit. [0007]
G 本發明具趙實施方式中的—種發光二極_動裝置用 於驅動複數LED燈串，每俩LED燈串可分為複數LED燈組 ，且，每飢ED燈組由複數LED燈同向串聯形成，該發光 一極體驅動裝董包括電源轉換電路與至少一個旁路保護 電路。電_換電路用於料部電源轉換為可驅動LED燈 的電訊號。每一旁路保護電路對應與一個LED燈組並聯， 用於當任意一個LED燈斷路時進行旁路保護，其包括開關 電路及電容。其中’開關電路包括複數開閘元件、異常 偵測模組及開關控制模組。每個開關元應與一個led 燈並聯，當異常偵測模組偵測到某一LED燈斷路時輸出異 常訊號，開關控制模組根據該異常訊號控制與斷路並聯 的開關元件開啟，從而提供旁路保護。電容與上述LED燈 並行連接，當LED燈於正常工作模式與脈衝調光模式第一 狀態時’其驅動電訊號對電容進行充電，且給開關電路 提供工作電源，當LED燈於脈衝調光模式第二狀態時，電 容放電用以維持開關電路的工作電源》 本發明中，每個LED燈串具有至少一個旁路保護電路當 某個LED燈發生斷路時，旁路保護電路可為其提供旁路支 098144344 表單編號A0101 第5頁/共17頁 0982075802-0 [0008] 201123987 路’使得整個LED燈串仍然可以正常工作，具有較高的可 靠性。 - 【實施方式】 [0009] 圖1所示為本發明發光二極體（Light Emitting Di〇de ’ LED)驅動裝置，用於驅動複數LED燈串30點亮，包括 電源轉換電路10與複數旁路保護電路20。其中，電源轉 換電路10用於將外部電源Vi η轉換為可驅動上述led^ _ 3〇的電訊號，該電訊號具有正電壓輸入端與負電壓輸入 端。每個LED燈串30可分為複數LED燈組301，每個Led^ 組301包括複數同向串聯的led燈，且工作於正常工作模 〇 式或脈衝調光模式（burst dimming mod专）。本實施 方式中，每個LED燈組301兩端具有公共.陽極與公共陰極 ，且’所述公共陽極與上述驅動LED燈串ί〇電訊號的正電 壓輸入端相連，所述公共陰極與上述LED燈串30電訊號的 負電壓輪入端相連。同時，每個LED燈組301與一個旁路 保護電路20相並聯，用於當任意一個LED廢斷路時進行旁 路保護，從而使得整個LED燈串30還可以正常發光。本實G The invention has a light-emitting diode-moving device for driving a plurality of LED light strings, and each of the two LED light strings can be divided into a plurality of LED light groups, and each of the hungry ED light groups is composed of a plurality of LED lights. Formed in series, the light-emitting diode driving device includes a power conversion circuit and at least one bypass protection circuit. The electric_changing circuit is used to convert the power supply of the material into an electrical signal that can drive the LED light. Each bypass protection circuit is correspondingly connected in parallel with an LED lamp group for bypass protection when any one of the LED lamps is open, and includes a switching circuit and a capacitor. The 'switching circuit includes a plurality of switching elements, an abnormality detecting module and a switch control module. Each switch element should be connected in parallel with a led lamp. When the abnormality detecting module detects that an LED light is broken, it outputs an abnormal signal, and the switch control module controls the switching element connected in parallel with the open circuit according to the abnormal signal to open. Road protection. The capacitor is connected in parallel with the LED lamp. When the LED lamp is in the normal working mode and the first state of the pulse dimming mode, the driving signal charges the capacitor and supplies the working power to the switching circuit when the LED lamp is in the pulse dimming mode. In the second state, the capacitor discharge is used to maintain the operating power of the switching circuit. In the present invention, each LED string has at least one bypass protection circuit. When an LED lamp is disconnected, the bypass protection circuit can provide a bypass. Road branch 098144344 Form number A0101 Page 5 of 17 0982075802-0 [0008] 201123987 Road 'Let the entire LED string still work, with high reliability. - [Embodiment] FIG. 1 shows a light emitting diode (LED) driving device for driving a plurality of LED strings 30 to be lit, including a power conversion circuit 10 and a plurality of Road protection circuit 20. The power conversion circuit 10 is configured to convert the external power source Vi η into an electrical signal capable of driving the LED _ 3 ,, the electrical signal having a positive voltage input terminal and a negative voltage input terminal. Each of the LED light strings 30 can be divided into a plurality of LED light groups 301, each of which includes a plurality of LED lamps connected in the same direction and operating in a normal working mode or a pulse dimming mode (burst dimming mod). In this embodiment, each LED lamp group 301 has a common anode and a common cathode at both ends, and 'the common anode is connected to the positive voltage input terminal of the above-mentioned driving LED string, the common cathode and the above The negative voltage of the LED string 30 is connected to the input terminal. At the same time, each LED light group 301 is connected in parallel with a bypass protection circuit 20 for bypass protection when any one of the LEDs is broken, so that the entire LED light string 30 can also emit light normally. Real
、 Q 施方式中，每個LED燈組301包括四個相互串聯的LED燈 。其他實施方式中，LED燈組301中的LED燈也可為其他 數目。 [0010] 圖2為本發明一實施方式中旁路保護電路2〇的具體電路圖 。旁路保護電路20並行連接於LED燈組301，該LED燈組 301具有相互串聯的led燈Dl、D2、D3、D4，當任意一個 LED燈斷路時，旁路保護電路2〇可以提供旁路支路。 [0011] 旁路保護電路20包括開關電路200以及電容C1。本實施方 098144344 表單編號A0101 第6頁/共17頁 0982075802-0 201123987 式中，開關電路200係一個積體電路，其包括複數開關元 件Ql、Q2、Q3、Q4、開關控制模組201、異常偵測模組 202以及單向導通元件D5。本實施方式中，開關元件Q1、 Q2、Q3、Q4的數量與LED燈組301中的LED燈Dl、D2、Ρ3 、D4的數量相同，二者--對應，且分別並行連接。具 體而言，開關元件Q1與LED燈D1相並聯，開關元件Q2與 LED燈D2相並聯，開關元件Q3與LED燈D3相並聯，開關元 件Q4與LED燈D1相並聯。 ο [_ 異常偵測模組202與LED燈組301相速，用於分別偵測LEP 燈Dl、D2、D3、Μ的電壓是否正常，從而判斷某一lEP 燈是否斷路，並輸出異常訊號。 [0013] 開關控制模組201與開關元件Qi、Q2、Q3、Q4及異常偵 測模組202相連’用於根據上述異常訊號控制相應的開關 元件開啟，從而提供旁路支路。例如，當異常偵測模組 ❹ 20 2偵測到LED燈D1發奉斷路時，，輸出異常:訊號至開關控 制模組201，從而開關控制:模組2〇1控制開關元件則導通 ，為LED燈D1提供旁路支路，則整個LED燈組3〇1仍然保 持通路；以此類推，當任意—個LED燈發生斷路時，旁路 保護電路20均可提供旁路支路給斷路的LED燈，使其不會 影響整個LED燈組301的工作。 [0014] 電容C1與LED燈組301並行連接，用於根據驅動LE])燈组 301的電訊號進行充放電，並給開關電路2〇〇提供正常工 作電源。通常，每個積體電路均需要電源來使其正常工 作，該電源可以是外部提供，也可以是内部電路轉換得 到。 、 098144344 表單編號A0101 第7頁/共17頁 ' 0982075802-0 201123987 [0015] [0016] [0017] [0018] 在脈衝調光模式下，LED燈組301的驅動電訊號為脈衝寬 度調變（PWM) sfl號’脈衝調光是通過改變pwjj訊號的佔 空比（duty cycle)來改變流經LED燈的電流大小，從 而調整LED背光源的亮度。通常，pWM訊號是—個高/低電 平週期訊號，本實施方式中，高電平是指有LED驅動電訊 號輸出至LED燈組301，該種狀態被定義為脈衝調光模式 的第一狀態；低電平是指無LED驅動電訊號輪出至LED燈 組301，該種狀態被定義為脈衝調光模式的第二狀態。可 見，在LED燈脈衝調光模式第二狀態時，無電流流經LED 燈組301，相應地也就無電訊號給開關電路2〇〇提供工作 電源。那麼，此時電容C1放電给'開關電路2〇〇，使開關電 路200仍然可以正常使用。 因此，當LED燈組301於正常工作模式與脈衝調光模式第 一狀態時，驅動LED燈組301的電訊號給開關電路200提 供工作電源’同時對電容C!進行充電；當led燈組301於 脈衝調光模式第二狀態時，電容C1放電用以維持開關電 路2 0 〇的工作電源。 本實施方式中，單向導通元件D5為二極體，其陽極與LED 燈組301的陽極相連，其陰極與電gC1相連，可以使[£1) 燈級3〇1驅動電訊號順向對電容〇1充電，同時也可避免在 脈衝調光模式下，電容C1對LED燈組301進行放電。 圖3所示為本發明另一實施方式中旁路保護電路2〇的具體 電路圖，其與圖2大體相同，區別在於：單向導通元件D5 放置於積體電路200外部’同樣連接於LED燈組3〇1的陽 098144344 &與電容C1之間 鵝珑 A0101 用於避免電容C1對LED燈組301放電。 第 8 頁/共 17 頁 0982075802-0 201123987 剛本發明中，每個LED燈串30具有至少一個旁路保護電路別 ’當某個LED燈發生斷路時，旁路保護電路2〇可為其提供 旁路支路，使得整個LED燈串30仍然可以正常工作，具有 較高的可靠性。 [0020] 综上所述，本發明符合發明專利要件，爰依法提出專利 申請。惟’以上所述者僅為本發明之較佳實施例，舉凡 熟悉本案技藝之人士，在爰依本案發明精神所作之等效 修飾或變化’皆應包含於以下之申請專利範圍内。 ❹In the Q mode, each LED light group 301 includes four LED lights connected in series with each other. In other embodiments, the LED lights in the LED light set 301 can be other numbers as well. 2 is a specific circuit diagram of a bypass protection circuit 2A according to an embodiment of the present invention. The bypass protection circuit 20 is connected in parallel to the LED lamp group 301. The LED lamp group 301 has LED lamps D1, D2, D3, and D4 connected in series with each other. When any one of the LED lamps is disconnected, the bypass protection circuit 2 can provide bypass. Branch road. [0011] The bypass protection circuit 20 includes a switching circuit 200 and a capacitor C1. In this embodiment, the switch circuit 200 is an integrated circuit including a plurality of switching elements Q1, Q2, Q3, Q4, a switch control module 201, and an abnormality. The detection module 202 and the unidirectional conduction element D5. In the present embodiment, the number of switching elements Q1, Q2, Q3, and Q4 is the same as the number of LED lamps D1, D2, Ρ3, and D4 in the LED lamp group 301, and the two are correspondingly connected in parallel. Specifically, the switching element Q1 is connected in parallel with the LED lamp D1, the switching element Q2 is connected in parallel with the LED lamp D2, the switching element Q3 is connected in parallel with the LED lamp D3, and the switching element Q4 is connected in parallel with the LED lamp D1. ο [_ The anomaly detection module 202 and the LED lamp group 301 are phase-speeded to detect whether the voltages of the LEP lamps D1, D2, D3, and Μ are normal, thereby determining whether an lEP lamp is open or not, and outputting an abnormal signal. [0013] The switch control module 201 is connected to the switching elements Qi, Q2, Q3, Q4 and the abnormality detecting module 202 for controlling the opening of the corresponding switching elements according to the abnormal signal, thereby providing a bypass branch. For example, when the abnormality detecting module ❹ 20 2 detects that the LED light D1 is disconnected, the output abnormality: the signal is sent to the switch control module 201, so that the switch control: the module 2〇1 controls the switching element to be turned on, The LED lamp D1 provides a bypass branch, and the entire LED lamp group 3〇1 still maintains the path; and so on, when any LED lamp is disconnected, the bypass protection circuit 20 can provide a bypass branch to the open circuit. The LED lights are such that they do not affect the operation of the entire LED light group 301. [0014] The capacitor C1 is connected in parallel with the LED lamp group 301 for charging and discharging according to the electric signal of the driving LE]) lamp group 301, and provides normal working power to the switching circuit 2〇〇. Typically, each integrated circuit requires a power supply to operate properly, either externally or internally. [0018] [0018] [0018] In the pulse dimming mode, the driving signal of the LED lamp group 301 is pulse width modulation (in the pulse dimming mode). PWM) sfl 'pulse dimming is to change the current flowing through the LED lamp by changing the duty cycle of the pwjj signal to adjust the brightness of the LED backlight. Generally, the pWM signal is a high/low level period signal. In the present embodiment, the high level means that the LED driving signal is output to the LED group 301, and the state is defined as the first of the pulse dimming mode. State; low level means that no LED drive signal is taken out to the LED light group 301, and this state is defined as the second state of the pulse dimming mode. It can be seen that in the second state of the LED lamp pulse dimming mode, no current flows through the LED lamp group 301, and accordingly no electrical signal is supplied to the switch circuit 2A to provide operating power. Then, at this time, the capacitor C1 is discharged to the 'switching circuit 2', so that the switching circuit 200 can still be used normally. Therefore, when the LED lamp group 301 is in the normal operation mode and the pulse dimming mode first state, the electric signal driving the LED lamp group 301 provides the working power supply to the switch circuit 200 while charging the capacitor C!; when the LED lamp group 301 is charged In the second state of the pulse dimming mode, the capacitor C1 is discharged to maintain the operating power of the switching circuit 20 〇. In the present embodiment, the unidirectional conduction element D5 is a diode, the anode of which is connected to the anode of the LED lamp group 301, and the cathode thereof is connected to the electric gC1, so that the [£1) lamp stage 3〇1 drives the electric signal forward direction pair. The capacitor 〇1 is charged, and at the same time, the capacitor C1 is discharged to the LED lamp group 301 in the pulse dimming mode. 3 is a specific circuit diagram of the bypass protection circuit 2〇 according to another embodiment of the present invention, which is substantially the same as FIG. 2, except that the one-way conduction element D5 is placed outside the integrated circuit 200 and is also connected to the LED light. The group 〇 144 144 144144344 & and the capacitor C1 between the geese A0101 is used to prevent the capacitor C1 from discharging the LED lamp group 301. Page 8 of 17 0982075802-0 201123987 In the present invention, each LED string 30 has at least one bypass protection circuit. 'When an LED lamp is disconnected, the bypass protection circuit 2 can provide it. The bypass branch allows the entire LED string 30 to still operate normally with high reliability. [0020] In summary, the present invention complies with the requirements of the invention patent, and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims. ❹
【圖式簡單說明】 [0021] 圖1所示為本發明發光二極體驅動裝置。 [0022] 圖2所示為本發明一 圖。 實施方式中旁路保護電路的具體電路 : . [0023] 圖3所示為本發明另 路圖。 一實施方式中旁路保護電路的具體電 [0024] 【主要元件符號說明】 電源轉換電路 ' if ¢. :, | :· '：：" ' i ' :i: π; 1 ·<......* if ·ί. 10 [0025] 旁路保護電路 20 [0026] 開關電路 200 [0027] 開關控制模組 201 [0028] 異常偵測模組 202 [0029] 開關元件 Ql、Q2、Q3、Q4 [0030] 電容 Cl 表單編號A0101 第9頁/共17頁 098144344 0982075802-0 201123987 [0031] 單向導通元件 D5 [0032] LED燈串 30 [0033] LED燈組 301 [0034] LED燈 Dl、D2、D3、D4 Ο 098144344 表單編號Α0101 第10頁/共17頁 0982075802-0BRIEF DESCRIPTION OF THE DRAWINGS [0021] FIG. 1 shows a light-emitting diode driving device of the present invention. 2 is a view of the present invention. A specific circuit of the bypass protection circuit in the embodiment: [0023] FIG. 3 is a different road diagram of the present invention. The specific circuit of the bypass protection circuit in one embodiment [0024] [Description of main component symbols] Power conversion circuit ' if ¢. :, | :· '::" ' i ' :i: π; 1 ·<. [0025] bypass protection circuit 20 [0026] switch circuit 200 [0027] switch control module 201 [0028] abnormality detection module 202 [0029] switching elements Ql, Q2 , Q3, Q4 [0030] Capacitance Cl Form No. A0101 Page 9 / Total 17 Page 098144344 0982075802-0 201123987 [0031] One-way conduction element D5 [0032] LED light string 30 [0033] LED light group 301 [0034] LED Lamp Dl, D2, D3, D4 Ο 098144344 Form number Α 0101 Page 10 / Total 17 page 0982075802-0