201220956 六、發明說明： 【發明所屬之技術領域】 本發鴨錢於—種冷陰極管驅動電路，_是具有高轉 *換效率、簡易電路設計、低製造成本與低電磁干擾等特性之冷 陰極管驅動電路。 【先前技術】 隨著照明產業的發展，照明並非僅僅只是偈限於傳統的日 * =辭’近縣㈣液關讀幕巾背賴_發展成熟，使 得利用冷陰極螢光燈管以作為照明光源，變成一種可行的替代 光源。 "亥冷陰極螢紐管係具有燈管管徑小、結構簡單、燈管表 面溫度低、表面亮度高與易於加王等特色，且更具有使用壽命 $、顯色性好與發光均勻等特色。然而，在照明的使用上，穩 疋的驅動照明係十分重要的，若將該冷陰極螢光燈管放置於習 • 知日光燈的傳統驅動電路，需要經由安定器或啟動器啟動，亦 或者其運作效補75%〜8G%，且價格昂貴與高電磁干擾等缺 失。 故有必要提供—齡動電路’其除可穩定的提供驅動燈管 的電壓電路外, 【發明内容】 亦包含可減低製造的成本與高發光效率等功效。 本發明之一目的係提供冷陰極管驅動電路，其係利用整流 電路、穩壓電容與穩壓電感穩定輸出整流電壓，用以達到穩定 201220956 驅動§亥冷陰極管的目的。 …本發明之另一目的係提供冷陰極管驅動電路，其係藉由變201220956 VI. Description of the invention: [Technical field of invention] This is a kind of cold cathode tube drive circuit, which is characterized by high conversion efficiency, simple circuit design, low manufacturing cost and low electromagnetic interference. Cathode tube drive circuit. [Prior Art] With the development of the lighting industry, lighting is not just limited to the traditional day * = resignation 'near county (four) liquid reading curtains back to the _ development mature, making the use of cold cathode fluorescent tube as an illumination source Become a viable alternative source. "Hai cold cathode fluorescent tube system has the characteristics of small diameter of lamp tube, simple structure, low surface temperature of lamp tube, high surface brightness and easy to add king, and has more service life, good color rendering and uniform illumination. Features. However, in the use of lighting, it is very important to drive the lighting system. If the cold cathode fluorescent lamp is placed in the traditional driving circuit of the fluorescent lamp, it needs to be activated via the ballast or the starter, or The operating efficiency is 75%~8G%, and the price is high and the electromagnetic interference is high. Therefore, it is necessary to provide an aging circuit which, in addition to stably providing a voltage circuit for driving the lamp, also includes the effects of reducing manufacturing cost and high luminous efficiency. One object of the present invention is to provide a cold cathode tube drive circuit which utilizes a rectifying circuit, a stabilizing capacitor and a stabilizing inductor to stabilize the output rectified voltage for stabilizing the 201220956 driving § HEL cold cathode tube. Another object of the present invention is to provide a cold cathode tube drive circuit which is modified by
壓器與該諧振電容等所域之並_振電路，用以達到降低成 到電磁干擾的目的β X 本發明之另-目的係提供冷陰極管驅動電路，其係藉由推 挽式的開關電路驅動方式，用以達到產生具有—工作週期的交 換切換的驅動目的。 為解決上述目的或其它目的，本發明係提供一種冷陰極管 驅動電路’細於提供照明光源，其包含輸人單元、整流單元、 譜振推挽式與單元。簡人單元雜收料的交流電 j ’違整流早讀触輸人單元連接，且健料元係根據該 乂机電壓對應地產生整流f壓；該諧振推挽式(Res〇咖The voltage-magnetizing circuit and the resonance-magnetizing circuit are used for the purpose of reducing the electromagnetic interference. The other object of the present invention is to provide a cold cathode tube driving circuit which is driven by a push-pull type switch. The circuit driving method is used to achieve the driving purpose of generating switching switching with a duty cycle. In order to solve the above object or other objects, the present invention provides a cold cathode tube driving circuit 'detailed to provide an illumination source comprising an input unit, a rectifying unit, a spectral push-pull type and a unit. The alternating current of the simplified unit is the same as the rectification and early reading of the input unit, and the health element generates the rectified f voltage according to the voltage of the rake; the resonant push-pull type (Res〇
Push-Pull)單讀與該整解元雜且該雜減式單元提供 "亥整机電堡以-工作週期(duty cycle)交互切換；以及該變壓器 單元係具有她端與她_端，該變鮮元之該初級線 圈端係_雜減式單元賴，域㈣雜減式單元於 該工作週期的交互切換，用以於該次級線圈端產生輸出電壓。 與習知技術相較，本發明之冷陰極管驅動電路係藉由整流 電路、穩㈣容與繼縣觀_整流龍，並_諧振推 挽式的電路，用以降低電磁干擾。此外，藉由本發明之驅動電 路係可藉㈣易設計，達雜高的鶴效率，其效率可較 習知電路增加10〇/〇以上。 201220956 【實施方式】 為充分瞭解本發明之目的、特徵及功效，兹藉由下述具體 之實施例，並配合所附之圖式，對本發明做—詳細說明，說明 如後： 參考第1圖’係本發明實施例之冷陰極管驅動電路之方塊 不忍圖。於第1圖中，冷陰極管驅動電路1〇係用於提供照明光 源’其包含：輸入單元12、整流單元1心諧振推挽式單元16 • 與變壓器單兀18。該輸入單元12係接收外部的交流電壓AC， 例如該交流電壓AC係可為一般習知的市電；該整流單元Μ係 與該輸入單元12連接，整流單元14餘_錢電壓Μ 對應_生整流電壓Dc，其中該整流電路之該整流電壓係可 為半波整流電壓或全波整流電壓，例如可利用橋式整流器產生 該全波整流電壓。 該譜振推挽式單元16係與該整流單元14連接，且該譜振 • 推挽式單元16提供該整流電壓DC以工作週敝互切換；以 及’該變壓器單几18係具有初級線圈端182與次級線圈端 184 ’該變壓單元18之該初級線圈端182係與該諧振推挽式單 元16連接，且藉由總振推挽式單元16於該X作週期的交互 切換，用以於該次級線圈端184產生輸出電壓伽。 且於另-實施例巾’該整流單元14係可更進—步包括穩麼 電路20,而該穩屢電路2(H系可提供穩定的整流電屋％，而穩 定的電Μ輸出係十分重要的，其係由於若輸出·Push-Pull) single-reading and the whole-decryption unit and the hybrid unit provides "Huidian electromechanical----------------------------------------------------------------------------------------------------- The primary coil end of the varnish is _subtractive unit ray, and the domain (four) nuisance unit is alternately switched during the duty cycle to generate an output voltage at the secondary coil end. Compared with the prior art, the cold cathode tube driving circuit of the present invention is used to reduce electromagnetic interference by means of a rectifying circuit, a stable (four) capacitance, a relay, and a resonant push-pull circuit. In addition, the driving circuit system of the present invention can be designed to achieve high efficiency, and the efficiency can be increased by more than 10 〇/〇 compared with the conventional circuit. 201220956 [Embodiment] In order to fully understand the object, features and effects of the present invention, the present invention will be described in detail by the following specific embodiments and the accompanying drawings. The block of the cold cathode tube drive circuit of the embodiment of the present invention is not tolerated. In Fig. 1, a cold cathode tube drive circuit 1 is used to provide an illumination source ** which includes an input unit 12, a rectification unit 1 cardiac resonant push-pull unit 16 and a transformer unit 18. The input unit 12 receives an external AC voltage AC. For example, the AC voltage AC can be a conventionally known utility power; the rectifier unit is connected to the input unit 12, and the rectification unit 14 has a corresponding voltage. The voltage Dc, wherein the rectified voltage of the rectifier circuit is a half-wave rectified voltage or a full-wave rectified voltage, for example, the full-wave rectified voltage can be generated by a bridge rectifier. The spectral push-pull unit 16 is connected to the rectifying unit 14, and the spectroscopic push-pull unit 16 provides the rectified voltage DC to switch between working cycles; and 'the transformer single 18 series has a primary coil end 182 and the secondary coil end 184 'the primary coil end 182 of the transformer unit 18 is connected to the resonant push-pull unit 16 and is switched by the total-vibration push-pull unit 16 during the X cycle. The secondary coil end 184 produces an output voltage gamma. In another embodiment, the rectifying unit 14 can further include a circuit 20, and the stable circuit 2 (the H system can provide a stable rectifying electric house%, and the stable electric output system is very Important, because it is output
Vout不穩 201220956 定則會引響到與该輪出電壓v〇ut電連接的冷陰極管因不穩定 的電壓造舰明光_嗎、，故若能提供敎的整流電壓DC， 可用以解決上述照明光源不穩定的問題，而於本實施例中，穩 壓電路2G係可為由選擇適當電感與電容所組成。 參考第2圖，係本發明實施例之冷陰極管驅動電路之詳細 電路圖。於第2圖中，冷陰極管驅動電路1()係包含：輸入單元 12、整流單兀14、諧振推挽式單元16、變壓器單元18與穩壓 電路20。輸入單元12係接收外部的交流電壓Ac，而該交流電 壓AC係以具有正負半週之正弦波為例說明，而於本實施例 中，該輸入單元12更可包含如同保險絲122等的保護元件。 该整流單元14係與該輸入單元12連接，且該整流單元14 係根據該交流電壓AC對應地產生整流電壓DC，其中於此係 以橋式整流器為例，用以產生該全波整流電壓，而該橋式整流 器係由四個二極體D1〜D4組合而成’其可使得輸入具有正弦波 的交流電壓AC ’於正半週時通過二極體di與二極體D2用以 形成第一電迴路L1 ;以及，於負半週時通過丄極體D3與二極 體D4用以形成第二電迴路L2，如第3圖所示。 此外’該整流單元14再透過與其連接之穩壓電路2〇，使 其整流電壓DC可透過該穩壓電路2〇用以提供穩定的整流電壓 DC。於本實施例中’該穩壓電路20係由穩壓電感202與穩壓 電容204所組成。 該諧振推挽式單元16係與該整流單元14連接，且該諧振 201220956 推挽式單元16提供穩定的該整流電壓DC以工作週期交互切 換’例如該I作週齡可以5G%的工作週期交互替進行切換。 再者’該譜振推挽式單元16係進-步包含電阻162、電感164、 諧振電容166與複數電子開關168。該等電子開關168係可為 電晶體、金氧半場效電晶體(MOSFET)或上述之組合。於此， 該等電子開關16係以電晶體Q1、Q2為例說明，且根據穩定的 整流電壓DC，電晶體Q1與電晶體Q2係可藉由該工作週期運 • 作，亦即於一時間内，僅電晶體Q1或電晶體Q2導通開啟。其 中，該諳振電容166係連接該等電晶體Φ、Q2之集極端與該 電阻162與該電感164係連接至該電晶體Q1、Q2之基極端， 藉由上述之電連接方式’其可根獅加於該電阻162與該電感 164上的電壓，使得該電晶體φ、Q2之射極端與該集極端之 間導通。而於另-實酬中，該等電晶體QbQ2係可由該等 金氧半場效應電晶體取代，脚該連接方式係可 : • 電容166與該等金氧半場效電晶體之汲極端與該電阻⑹與該 電感164係連接料金氧半場效應電晶體之祕端，而藉由上 述之電連接方式’其可根據施加於該電阻162與該電感164上 的電壓’使得該等金氧半場效電晶體之雜端與麵極端之 導通。 該變壓器單元18倾有她線_182與次級線圈端 184 ’該變壓單元18之該初級線圈端182係與該譜振推挽式單 元I6連接’且藉㈣鞠峨式單元10於社作棚的交互 7 201220956 切換，用以於該次級線圈端184產生輸出電壓v〇ut。此外，該 初級線圈端182係為中心抽頭式型態，且該初級線圈端182係 與該諧振電容166並聯，用以形成並聯諧振電路。 與習知技術相較，本發明之冷陰極管驅動電路係藉由整流 電路、穩壓電容與穩壓電感穩定輸出整流電壓，並利用諧振推 挽式的電路，用以降低電磁干擾。此外，藉由本發明之驅動電 路係可藉由簡易電路設計，達成較高的驅動效率，其效率可較 習知電路增加10%以上。 本發明在上文中已以較佳實施例揭露，然熟習本項技術者 應理解的是，該實施例僅用於描繪本發明，而不應解讀為限制 本發明之範圍。應注意的是，舉凡與該實施例等效之變化與置 換，均應設為涵蓋於本發明之範疇内。因此，本發明之保護範 圍當以下文之申請專利範圍所界定者為準。 【圖式簡單說明】 第1圖係本發明實施例之冷陰極管驅動電路之方塊示意圖； 第2圖係本發明實施例之冷陰極管驅動電路之詳細電路圖；以 及 第3圖係本發明實施例之冷陰極管驅動電路之整流示意圖。 【主要元件符號說明】 10 冷陰極管驅動電路 12 輸入單元 122 保險絲 201220956 14 16 162 164 166 168 18Vout instability 201220956 will cause the cold cathode tube electrically connected to the turn-off voltage v〇ut to be built by the unstable voltage, so if the rectified voltage DC can be provided, it can be used to solve the above illumination. The problem that the light source is unstable, and in this embodiment, the voltage stabilizing circuit 2G can be composed of selecting an appropriate inductor and capacitor. Referring to Fig. 2, there is shown a detailed circuit diagram of a cold cathode tube driving circuit of an embodiment of the present invention. In Fig. 2, the cold cathode tube drive circuit 1 () includes an input unit 12, a rectifying unit 14, a resonant push-pull unit 16, a transformer unit 18, and a voltage stabilizing circuit 20. The input unit 12 is configured to receive an external AC voltage Ac, and the AC voltage AC is exemplified by a sine wave having a positive and negative half cycle. In the embodiment, the input unit 12 may further include a protection component such as a fuse 122. . The rectifying unit 14 is connected to the input unit 12, and the rectifying unit 14 correspondingly generates a rectified voltage DC according to the AC voltage AC, wherein the bridge rectifier is taken as an example to generate the full-wave rectified voltage. The bridge rectifier is composed of four diodes D1 to D4, which can make the input AC voltage AC' having a sine wave pass through the diode di and the diode D2 during the positive half cycle. An electrical circuit L1; and, in the negative half cycle, is used to form the second electrical circuit L2 through the diode D3 and the diode D4, as shown in FIG. In addition, the rectifying unit 14 is further connected to the voltage stabilizing circuit 2 与其 connected thereto so that the rectified voltage DC can pass through the stabilizing circuit 2 to provide a stable rectified voltage DC. In the present embodiment, the voltage stabilizing circuit 20 is composed of a voltage stabilizing inductor 202 and a voltage stabilizing capacitor 204. The resonant push-pull unit 16 is connected to the rectifying unit 14, and the resonant 201220956 push-pull unit 16 provides stable rectification voltage DC to switch between duty cycles. For example, the I can be 5G% of duty cycle interaction. Switch for. Further, the spectral push-pull unit 16 includes a resistor 162, an inductor 164, a resonant capacitor 166, and a plurality of electronic switches 168. The electronic switches 168 can be transistors, metal oxide half field effect transistors (MOSFETs), or combinations thereof. Here, the electronic switches 16 are exemplified by the transistors Q1 and Q2, and according to the stable rectified voltage DC, the transistors Q1 and Q2 can be operated by the duty cycle, that is, at a time. Inside, only the transistor Q1 or the transistor Q2 is turned on. The oscillating capacitor 166 is connected to the collector terminal of the transistors Φ and Q2, and the resistor 162 and the inductor 164 are connected to the base terminals of the transistors Q1 and Q2, and the above-mentioned electrical connection method The root lion is applied to the resistor 162 and the voltage across the inductor 164 such that the emitters of the transistors φ, Q2 are electrically connected to the collector terminal. In another payment, the transistors QbQ2 can be replaced by the MOS field-effect transistors, and the connection method can be: • The capacitance 166 and the 汲 terminal of the MOS field-effect transistor and the resistor (6) and the inductor 164 is connected to the secret end of the gold-oxygen half-field transistor, and the above-mentioned electrical connection mode 'which can make the gold-oxygen half-field effect according to the voltage applied to the resistor 162 and the inductor 164 The heterojunction of the crystal is conductive to the surface extreme. The transformer unit 18 is tilted with her wire _182 and the secondary coil end 184 'the primary coil end 182 of the transformer unit 18 is connected to the spectral push-pull unit I6' and the (four) 单元 unit 10 The interaction of the shed 7 201220956 is used to generate an output voltage v〇ut at the secondary coil end 184. In addition, the primary coil end 182 is of a center tap type and the primary coil end 182 is coupled in parallel with the resonant capacitor 166 for forming a parallel resonant circuit. Compared with the prior art, the cold cathode tube driving circuit of the present invention stabilizes the output rectified voltage by a rectifying circuit, a stabilizing capacitor and a stabilizing inductor, and utilizes a resonant push-pull type circuit to reduce electromagnetic interference. In addition, the driving circuit of the present invention can achieve higher driving efficiency by simple circuit design, and the efficiency can be increased by more than 10% compared with the conventional circuit. The invention has been described above in terms of preferred embodiments, and it should be understood by those skilled in the art that the present invention is not intended to limit the scope of the invention. It should be noted that variations and modifications equivalent to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the scope of protection of the present invention is defined by the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a cold cathode tube driving circuit of an embodiment of the present invention; FIG. 2 is a detailed circuit diagram of a cold cathode tube driving circuit of an embodiment of the present invention; and FIG. 3 is an embodiment of the present invention. A rectification schematic of a cold cathode tube drive circuit. [Main component symbol description] 10 Cold cathode tube drive circuit 12 Input unit 122 Fuse 201220956 14 16 162 164 166 168 18
• 182 184 20 202 204 AC DC H Vout D1-D4 LI L2 整流單元 言皆振推挽式單元 電阻 電感 諳振電容 電子開關 變壓器單元 初級線圈端 次級線圈端 穩壓電路 穩壓電感 穩壓電容 交流電壓 整流電壓 輸出電壓 二極體 第一電迴路 第二電迴路 Q1 >Q2 電晶體 9• 182 184 20 202 204 AC DC H Vout D1-D4 LI L2 Rectifier unit 皆 振 push-pull unit resistance inductance 谙 vibration capacitor electronic switch transformer unit primary coil end secondary coil terminal voltage regulator circuit regulator inductance voltage regulator capacitor exchange Voltage rectified voltage output voltage diode first electric circuit second electric circuit Q1 > Q2 transistor 9