200810606 九、發明說明 【發明所屬之技術領域】 , 本發明是有關於一種自激式電子安定器，且特別是有關 於一種具有全橋轉換器架構之自激式電子安定器。 ? 【先前技術】 隨著科技的發展及生活水準的提高，照明已成為人類曰 Φ $生活中不可缺少的基本需求。近年來由於全球各種產業的 、蓬勃發展、商業活動的頻繁以及居家生活品質的提高，碑明 用電也與日倶增，使得合乎高效率、舒適、安全、高經^效 應之照明系統的開發也漸漸備受重視。而在大多數的照明系 統中，皆需使用安定器來工作。 請參考第1圖，其係繪示習知之自激式半橋電子安定器 之電路示意圖，其中半橋轉換器22係利用上臂開關控制線^ 24來控制上臂開關26，以及利用下臂開關控制線圈來控 鲁制下臂開關30，使得上臂開關26和下臂開關3〇相互切換， 以提供後端電路一方波交流電壓來驅動負載32。請參考第2a 圖至第2B圖，其係繪示習知之自激式半橋電子安定器之各開 關之電流應力示意圖。請參考第2A圖，其係繪示上臂開關％ 之電流應力示意圖，可以發現到，上臂開關26所承受之電流 應力非常大，類似地，請參考第2B圖，其係繪示下臂開關3〇 之電流應力示意圖，可以發現到，下臂開關3〇所承受之電流 應力亦非常的大，導致半橋式電子安定器之輸出功率被大幅 地限制且需要選用較大額定電流規格之元件來使用，造成成 200810606 本的上升。 【發明内容】 因此，本發明的目的就是在提供一種自激式全橋電子安 定器，其開關所需承受之電流應力比習知之自激式半橋電子 女疋益之開關所承受之電流應力還小。 本發明的另一目的就是在提供一種自激式全橋電子安定 器，運用於其中之整流器和開關之額定電流值比運用於習知 之半橋轉換器中之整流器和開關之額定電流值還小。 。。根據本發明之上述目的，提出_種自激式全橋電子安定 :’至少包括一負載；一電源，用以提供一穩定交流輸入電 壓；:整流器’用以將穩定交流輸人電壓轉換為—穩定直流 電壓二一全橋轉換器，用以將穩定直流電壓轉換為一方波交 流電壓；一啟動電路，用以啟動全橋轉換器之作業；以及一 错振電路，用以轉換方波交流電壓為_弦波電壓並提供弦波 電壓給負載；其中，啟動電路啟動全橋轉換器之作業後，全 橋轉換器將整n所提供之穩定直流電壓轉換為方波交流電 壓並提供給諧振電路，而諧振電路將方波交流電壓轉換為弦 波電壓，以提供弦波電壓給負載，並實現零電壓切換（Zero Voltage Switching)之功能。 一依照本發明之較佳實施例，全橋轉換器至少包括：一第 開關’電性連接整流器；一第一控制線圈，用以控制第一 開關i 一第二開關，串聯第一開關；一第二控制線圈，用以 控制第二開關；—第三開關’電性連接整流II ; -第三控制 200810606 線圈，用以控制第三開關·一牮 卜 開關，#四開關，串聯第三開關；一 第四控制線圈，用以控制第四鬥· 制弟四開關，以及一轉向控制線圈， I 用以控制第一控制線圈之雷泠古A 十 瓦_ t罨机方向、第二控制線圈之電流方 :向、第三控制線圈之電流方向和第四控制線圈電流方向；i 中’啟動電路啟動全橋轉換器之作業後，第一開關、第二開· 關：：三開關和第四開關開始相互切換，以將整流器所提供 之穩定直流電壓轉換為方波交流電壓並提供給魏電路，譜 •振電路將方波交流電壓轉換為弦波電壓，以提供弦波電壓給 負載，並實現零電壓切換（zero voltage Switching)之功能。 依照本發明之較佳實施例，全橋轉換器更可包含一第一 限壓益，係並聯第一開關以保護第一開關；一第二限壓器， 係並聯第二開關以保護第二開關；一第三限壓器，係並聯第 二開關以保護第三開關；以及一第四限壓器，係並聯第四開 關以保護第四開關。 依照本發明之較佳實施例，其中一第一限壓器、第二限 馨壓裔、第三限壓器和第四限壓器係各由兩個陽極相對之齊納， 二極體串聯所組成。 依照本發明之較佳實施例，整流器可為半波整流器或全 波整流裔且更可包含一穩壓電容。 依照本發明之較佳實施例，啟動電路至少包含一交流開 關元件’用以啟動全橋轉換器之作業；一啟動電阻， 啟動電阻之一端電性連接整流器，啟動電阻之另一端電性連 接交流開關元件；以及一啟動電容，用以開啟交流開關 元件。 200810606 依照本發明之較佳實施例 二開關之額定電流值、第三開 二開關之額定電流值和整流器 半橋電子安定器之整流器之額 更小。 ’第-開關之額定電流值、第 關之額定電流值、第四開關第 之額定電流值比應用於自激式 定電流值和開關之額定電流值 【實施方式】 鲁、#參考帛3目’其係緣示根據本發明較佳實施例之自激 式全橋電子安定器之電路示意圖。此種電子 交流電源心-整流器211、一啟動電路、一全橋 一諧振電路以及一負載212，其中，負載212例如可以為燈管， 且例如可以為複金屬燈、冷陰極螢光燈、線型螢光燈、陰極 螢光燈、發光二極體、氙氣燈、有機發光二極體等燈管等效 電阻變動範圍小及大的燈管。 > - 根據本發明之較佳實施例，整流器211係用以將交流電 _ '原、〇所^供之穩&父流輸入電壓轉換為一穩定直流電壓。 整流器211可為包含有二個二極體之半波整流器或是包含有 四個一極體之全波整流器，且整流器211更包含有一穩壓電 谷Cdc ’使整流器211所提供之直流電壓之波形能較為平穩。 根據本發明之較佳實施例，啟動電路至少包括一啟動電 阻214、一啟動電容216、一交流開關元件（Dac)2 18以及 一放電二極體219,其中啟動電阻214之一端電性連接整流器 211 ’另一端則電性連接啟動電容216和交流開關元件 2 1 8 °整流器2 1 1所提供之直流電壓透過啟動電阻 200810606 2 1 4對啟動電容2 1 6奋雷，#六& p目日日 令z 1 充電，使父流開關元件2丨8開 啟，以啟動全橋轉換器之作業。放電二極體219係用 以防止交流開關元件2丨8再觸發。 根據本發明之較佳實施例，全橋轉換器至少包括一第一 開關220、一第一控制線圈222、一第一限壓器223、一第二 開關224、一第二控制線圈226、一第二限壓器227、一第三 開關228、——第三控制線圈23〇、一第三限壓器231、一第四 開關232、一第四控制線圈234、一第四限壓器236、以及一 轉向控制線圈238,其中第一控制線圈222、第二控線圈226、 第三控制線圈230、第四控制線圈234以及轉向控制線圈238 皆纏繞於同一顆鐵心繞組上，且第一控制線圈222和第四控 制線圈234之極性與第二控制線圈226、第三控制線圈23〇以 及轉向控制線圈238之極性相反；第一限壓器223、第二限壓 器227、第三限壓器231以及第四限壓器236係各由兩個陽極 相對之齊納二極體串聯所組成。 當交流開關元件2 1 8開啟之後，便會有電流流經第二控 制線圈226，此時，第三控制線圈230會感應產生一電流往第 二開關228的方向流去。當第二控制線圈226的電壓超過第 二開關224之閘極臨界電壓時，第二開關224便會開啟，類 似地，當第三控制線圈230上的電壓超過第三開關228之閘 極臨界電壓時，第三開關228便會開啟。第二限壓器227與 第二控制線圈226並聯以提供第二控制線圈226 —電流釋放 路徑，類似地，第三限壓器231與第三控制線圈230並聯以 提供第三控制線圈230 —電流釋放路徑。全橋轉換器開始工 200810606 作後’父流開關元件218便會進入關閉狀態，在全橋轉換器 工作期間不再開啟。 1 當第二開關224和第三開關228開啟後，便會有電流從 : #振電路肌過轉向控制線圈238，此時，第一控制線圈222會， 感應產生一電流往第一開關22〇的方向流去，第四控制線圈 234會感應產生一電流往第四開關232的方向流去。當第一控 制線圈222的電壓超過第一開關22〇之閘極臨界電壓時，第 φ. 一開關220便會開啟，類似地，當第四控制線圈234上的電 壓超過第四開關232之閘極臨界電壓時，第四開關232便會 開啟。第一限壓器223與第一控制線圈222並聯以提供第一* 控制線圈222 —電流釋放路徑，類似地，第四限壓器23 6與 第四控制線圈234並聯以提供第四控制線圈234 一電流釋放 路徑。 當第一開關220和第四開關232開啟後，便會有電流流 — 經轉向控制線圈238往諧振電路流去，此時，第二控制線圈 226會感應產生一電流往第二開關224的方向流去，第三控制" 2圈230亦會感應產生一電流往第三開關228的方向流去。 當第二控制線圈226的電壓超過第二開關224之閘極臨界電 壓時，第二開關224便會再度開啟，類似地，當第二 圈230上的電壓超過第三開關228之閘極臨界電㈣控= 開關228亦會再度開啟。 根據本發明之較佳實施例，諧振電路包括一諧振電感 24〇、-濾直流電容242以及—諧振電容244，其中諧振電容 244與負载212並聯。諧振電路係用以將全橋轉換器所輸出之 10 200810606 方波電壓轉換成弦波電壓並輸出至負載212，且諧振電路亦具 有零電壓切換（Zero Voltage Switching)之功能。 ^ 由上述之說明可知，本發明之較佳實施例係利用第一開 , 關220和第四開關232與第二開關224和第三開關228之相 互切換將整流器所輸出直流電壓轉換成方波交流電壓，此方 波交流f壓之電壓值tbf知之自激式半橋電子安定器所提供 給負載之方波交流電壓更高。 —請參考第4A圖至第4D圖，其係分別繪示根據本發明較 佳實施例之第一開關220、第二開關224、第三開關228以及 第四開關232之電流應力示意圖。請參考第4八圖，其係繪示 第一開關220之電流應力示意圖，可以發現到，第一開關22〇 的電流應力比習知之自激式半橋電子安定器之開關電流應力 更小。凊參考第4B圖，其係繪示第二開關224之電流應力示 意圖，可以發現到，第二開關224的電流應力比習知之自激. 式半橋電子女疋器之開關電流應力更小。請參考第4C圖，其 係繪不第二開關228之電流應力示意圖，可以發現到，第三 開|| 228㈣流應力^匕習知之自激式半橋電子安定器之開關 電流應力更小。請參考第4D圖，其係繪示第四開關232之電 流應力不意圖，可以發現到，第四開關232的電流應力比習 知之自激式半橋電子安定器之開關電流應力更小。由此可合 理推知，整肌益211之電流應力亦比習知之自激式半橋電子 安定器之整流器電流應力更小。 由上述本發明之較佳實施例可知，本發明之優點就是， 利用第一開關220、第二開關224、第三開關228以及第四開 11 200810606 關232，來提供後端電路更高的驅動電壓，以減少第一200810606 IX. DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a self-excited electronic ballast, and more particularly to a self-excited electronic ballast having a full bridge converter architecture. [Prior Art] With the development of technology and the improvement of living standards, lighting has become an indispensable basic requirement in human life. In recent years, due to the booming development of various industries around the world, the frequent activities of commercial activities and the improvement of the quality of life at home, the use of electricity in the inscriptions has also increased, making the development of lighting systems that are efficient, comfortable, safe, and highly effective. It is also getting more and more attention. In most lighting systems, stabilizers are required to work. Please refer to FIG. 1 , which is a schematic circuit diagram of a conventional self-excited half bridge electronic ballast. The half bridge converter 22 controls the upper arm switch 26 by using the upper arm switch control line 24 and the lower arm switch. The coil controls the lower arm switch 30 such that the upper arm switch 26 and the lower arm switch 3 are switched to each other to provide a back-end circuit square wave AC voltage to drive the load 32. Please refer to Figs. 2a to 2B, which are schematic diagrams showing the current stress of each switch of the conventional self-excited half bridge electronic ballast. Please refer to FIG. 2A, which is a schematic diagram showing the current stress of the upper arm switch %. It can be found that the current stress on the upper arm switch 26 is very large. Similarly, please refer to FIG. 2B, which shows the lower arm switch 3. The current stress diagram of 〇 can be found that the current stress on the lower arm switch 3〇 is also very large, resulting in a large limitation of the output power of the half bridge electronic ballast and the need to select components with larger rated current specifications. Used, resulting in a rise of 200810606. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a self-excited full-bridge electronic ballast whose current stress is required to be subjected to a current stress of a conventional self-excited half-bridge electronic female switch. Still small. Another object of the present invention is to provide a self-excited full-bridge electronic ballast in which the rated current value of the rectifier and the switch is smaller than the rated current of the rectifier and the switch used in the conventional half-bridge converter. . . . According to the above object of the present invention, a self-excited full-bridge electronic stability is proposed: 'at least one load; one power supply for providing a stable AC input voltage; and a rectifier' for converting a stable AC input voltage to - A stable DC voltage two-bridge full-bridge converter for converting a stable DC voltage into a square-wave AC voltage; a start-up circuit for starting a full-bridge converter; and a wobble circuit for converting a square-wave AC voltage Is the sine wave voltage and provides the sine wave voltage to the load; wherein, after the startup circuit starts the operation of the full bridge converter, the full bridge converter converts the stable DC voltage provided by the whole n into a square wave AC voltage and supplies it to the resonant circuit The resonant circuit converts the square wave AC voltage into a sinusoidal voltage to provide a sinusoidal voltage to the load and implement Zero Voltage Switching. According to a preferred embodiment of the present invention, the full bridge converter includes at least: a first switch 'electrical connection rectifier; a first control coil for controlling the first switch i to the second switch, the first switch in series; a second control coil for controlling the second switch; a third switch 'electrically connected to the rectifier II; - a third control 200810606 coil for controlling the third switch · a switch, #四开关, series third switch a fourth control coil for controlling the fourth bucket, the fourth switch, and a steering control coil, I for controlling the first control coil of the Thunderbolt A 10 watt t 罨 t machine direction, the second control coil The current side: the direction of the current to the third control coil and the direction of the fourth control coil current; i in the 'starting circuit to start the operation of the full bridge converter, the first switch, the second open · off:: three switches and The four switches begin to switch to each other to convert the stable DC voltage provided by the rectifier into a square wave AC voltage and provide it to the Wei circuit. The spectrum oscillator circuit converts the square wave AC voltage into a sine wave voltage to provide a sine wave voltage. Load and realize the function of zero voltage switching. According to a preferred embodiment of the present invention, the full bridge converter may further include a first voltage limiting benefit, the first switch is connected in parallel to protect the first switch; and a second voltage limiter is connected in parallel to protect the second switch. a third voltage limiter is connected in parallel to protect the third switch; and a fourth voltage limiter is connected in parallel with the fourth switch to protect the fourth switch. According to a preferred embodiment of the present invention, a first voltage limiter, a second limiter, a third voltage limiter, and a fourth voltage limiter are respectively connected by two anodes, and the diodes are connected in series. Composed of. In accordance with a preferred embodiment of the present invention, the rectifier can be a half-wave rectifier or a full-wave rectification family and can further include a voltage stabilizing capacitor. According to a preferred embodiment of the present invention, the starting circuit includes at least one alternating current switching element 'for starting the operation of the full bridge converter; and one starting resistor, one end of the starting resistor is electrically connected to the rectifier, and the other end of the starting resistor is electrically connected to the alternating current. a switching element; and a starting capacitor for turning on the alternating current switching element. 200810606 In accordance with a preferred embodiment of the present invention, the rated current value of the switch, the rated current value of the third open switch, and the rectifier of the rectifier half-bridge electronic ballast are smaller. 'The rated current value of the first switch, the rated current value of the second switch, and the rated current value of the fourth switch are applied to the self-excited constant current value and the rated current value of the switch. [Embodiment] Lu, #参考帛3目A schematic diagram of a circuit of a self-excited full-bridge electronic ballast in accordance with a preferred embodiment of the present invention. The electronic AC power supply core-rectifier 211, a start-up circuit, a full-bridge-resonant circuit, and a load 212, wherein the load 212 can be, for example, a lamp tube, and can be, for example, a composite metal lamp, a cold cathode fluorescent lamp, or a line type. Fluorescent lamps, cathode fluorescent lamps, light-emitting diodes, xenon lamps, organic light-emitting diodes, and the like have small variations in lamp equivalent resistance and large lamps. > - In accordance with a preferred embodiment of the present invention, the rectifier 211 is operative to convert the alternating current &amplifier& parent input voltage to a regulated DC voltage. The rectifier 211 can be a half-wave rectifier including two diodes or a full-wave rectifier including four one-poles, and the rectifier 211 further includes a voltage-stabilizing valley Cdc 'the DC voltage provided by the rectifier 211. The waveform can be smoother. According to a preferred embodiment of the present invention, the starting circuit includes at least a starting resistor 214, a starting capacitor 216, an alternating current switching element (Dac) 2 18 and a discharge diode 219, wherein one end of the starting resistor 214 is electrically connected to the rectifier 211 'The other end is electrically connected to the starting capacitor 216 and the AC switching element 2 1 8 ° The rectifier 2 1 1 provides the DC voltage through the starting resistor 200810606 2 1 4 to the starting capacitor 2 1 6 Fenlei, #六& p目The day z1 is charged, causing the parent flow switching element 2丨8 to be turned on to start the operation of the full bridge converter. The discharge diode 219 is used to prevent the AC switching element 2丨8 from being retriggered. According to a preferred embodiment of the present invention, the full bridge converter includes at least a first switch 220, a first control coil 222, a first voltage limiter 223, a second switch 224, and a second control coil 226. The second voltage limiter 227, the third switch 228, the third control coil 23, the third voltage limiter 231, the fourth switch 232, the fourth control coil 234, and the fourth voltage limiter 236 And a steering control coil 238, wherein the first control coil 222, the second control coil 226, the third control coil 230, the fourth control coil 234, and the steering control coil 238 are all wound on the same core winding, and the first control The polarities of the coil 222 and the fourth control coil 234 are opposite to those of the second control coil 226, the third control coil 23A, and the steering control coil 238; the first voltage limiter 223, the second voltage limiter 227, and the third voltage limiting The 231 and the fourth voltage limiter 236 are each composed of two anodes connected in series with the Zener diodes. When the AC switching element 2 18 is turned on, current flows through the second control coil 226. At this time, the third control coil 230 induces a current to flow in the direction of the second switch 228. When the voltage of the second control coil 226 exceeds the gate threshold voltage of the second switch 224, the second switch 224 is turned on. Similarly, when the voltage on the third control coil 230 exceeds the gate threshold voltage of the third switch 228. The third switch 228 will be turned on. The second voltage limiter 227 is coupled in parallel with the second control coil 226 to provide a second control coil 226 - a current release path. Similarly, the third voltage limiter 231 is coupled in parallel with the third control coil 230 to provide a third control coil 230 - current Release the path. The full-bridge converter starts work 200810606 After the 'parent flow switching element 218 will enter the off state and will not turn on during the full-bridge converter operation. 1 When the second switch 224 and the third switch 228 are turned on, there will be a current from: #振电路肌过转转控线圈238, at this time, the first control coil 222 will induce a current to the first switch 22〇 The direction of the flow, the fourth control coil 234 induces a current to flow in the direction of the fourth switch 232. When the voltage of the first control coil 222 exceeds the gate threshold voltage of the first switch 22, the first switch 220 is turned on, similarly, when the voltage on the fourth control coil 234 exceeds the gate of the fourth switch 232 At the extreme threshold voltage, the fourth switch 232 will be turned on. The first voltage limiter 223 is coupled in parallel with the first control coil 222 to provide a first* control coil 222 - a current release path. Similarly, a fourth voltage limiter 23 6 is coupled in parallel with the fourth control coil 234 to provide a fourth control coil 234. A current release path. When the first switch 220 and the fourth switch 232 are turned on, there is a current flow - flowing through the steering control coil 238 to the resonant circuit. At this time, the second control coil 226 induces a current to the second switch 224. Flowing, the third control " 2 turns 230 will also induce a current to flow in the direction of the third switch 228. When the voltage of the second control coil 226 exceeds the gate threshold voltage of the second switch 224, the second switch 224 will be turned on again. Similarly, when the voltage on the second coil 230 exceeds the gate critical voltage of the third switch 228. (4) Control = Switch 228 will also be turned on again. In accordance with a preferred embodiment of the present invention, the resonant circuit includes a resonant inductor 24A, a -filtered DC capacitor 242, and a resonant capacitor 244, wherein the resonant capacitor 244 is coupled in parallel with the load 212. The resonant circuit is used to convert the 10 200810606 square wave voltage outputted by the full bridge converter into a sinusoidal voltage and output to the load 212, and the resonant circuit also has the function of Zero Voltage Switching. As can be seen from the above description, the preferred embodiment of the present invention converts the DC voltage outputted by the rectifier into a square wave by switching between the first opening, closing 220 and the fourth switch 232 and the second switch 224 and the third switch 228. The AC voltage, the voltage value tbf of the square wave AC f voltage, is known to be higher in the square wave AC voltage supplied to the load by the self-excited half bridge electronic ballast. - Refer to Figures 4A through 4D, which are schematic diagrams showing current stresses of the first switch 220, the second switch 224, the third switch 228, and the fourth switch 232, respectively, in accordance with a preferred embodiment of the present invention. Please refer to FIG. 4, which is a schematic diagram showing the current stress of the first switch 220. It can be found that the current stress of the first switch 22〇 is smaller than that of the conventional self-excited half bridge electronic ballast. Referring to Fig. 4B, which illustrates the current stress of the second switch 224, it can be seen that the current stress of the second switch 224 is smaller than that of the conventional self-excited half-bridge electronic female device. Please refer to FIG. 4C, which is a schematic diagram showing the current stress of the second switch 228. It can be found that the third open || 228 (four) flow stress has a smaller switching current stress than the conventional self-excited half bridge electronic ballast. Referring to FIG. 4D, which illustrates the current stress of the fourth switch 232, it can be found that the current stress of the fourth switch 232 is smaller than that of the conventional self-excited half bridge electronic ballast. It can be reasonably inferred that the current stress of the whole muscle 211 is also smaller than that of the conventional self-excited half bridge electronic ballast. It will be apparent from the above-described preferred embodiments of the present invention that the first switch 220, the second switch 224, the third switch 228, and the fourth switch 11 200810606 are used to provide a higher drive for the back end circuit. Voltage to reduce the first
220、弟二開關224、黛：戸弓關»键 SH J ^弟二開關228以及弟四開關232的電漭 應力。 < 由上述本發明之較佳實施例可知，本發明之另一優點 二，當開關的電流應力減少後，應用於本發明之開關和整二 盗之額定電流值亦可以大幅地減少’進而達到節省成本之： # 雖然本發明已以—較佳實施例揭露如上，然其並非心 =本㈣，任何熟W技藝者，在不脫離本發明之精神和 =圍内，备可作各種之更動與潤飾，因此本發明之保護範圍 备視後附之申請專利範圍所界定者為準。 【圖式簡單說明】220, the second switch 224, 黛: 戸 bow off » key SH J ^ brother two switch 228 and the fourth switch 232 electric 应力 stress. < From the above preferred embodiment of the present invention, another advantage of the present invention is that, when the current stress of the switch is reduced, the rated current value of the switch and the second thief applied to the present invention can be greatly reduced. To achieve cost savings: # Although the present invention has been disclosed in the preferred embodiment as above, but it is not the heart = this (four), any skilled person skilled in the art, without departing from the spirit and scope of the present invention, can be made into various The scope of protection of the present invention is defined by the scope of the appended claims. [Simple description of the map]
為讓本發明^述和其他目 易懂，下文特舉一較佳實施例， 明如下： 的、特徵、和優點能更明顯 並配合所附圖式，作詳細說 圖 第1圖繪示習知之自激式半橋電子安定器之電路示意 第2A圖至第2B圖繪示習知+ Α λ ， .Ρ9 曰丁‘知之自激式半橋電子安定器之 各開關之電流應力示意圖。 苐3圖係緣不根據本發明齡社 Θ榖佳實施例之自激式全橋電子 女定器之電路示意圖。 第4Α圖至第4D圖係分別洽 』、、日不根據本發明較佳實施例之 弟—開關、第二開關 '第三開關 ]關以及第四開關之電流應力示 12 200810606 意圖。 【主要元件符號說明】In order to make the present invention and others understandable, the following description of the preferred embodiments will be as follows, and the features, advantages and advantages will be more obvious and in accordance with the drawings. The circuit diagram of the self-excited half-bridge electronic ballast is shown in Figs. 2A to 2B. The current stress diagrams of the switches of the self-excited half-bridge electronic ballast of the conventional + Α λ , . The schematic diagram of the self-excited full-bridge electronic daughter device according to the preferred embodiment of the invention is not shown. 4th to 4D are respectively intended to be in accordance with the preferred embodiment of the present invention, the switch, the second switch 'third switch' off, and the fourth switch current stress indication 12 200810606. [Main component symbol description]
22 ： 半橋轉換器 24 ； 26 ； 上臂開關 28 ： 30 ： 下臂開關 32 ： 210 :交流電源 211 212 _•負載 214 216 :啟動電容 218 219 :放電二極體 220 222 :第一控制線圈 223 224 :第二開關 226 227 :第二限壓器 228 230 :第三控制線圈 231 232 :第四開關 234 236 ••第四限壓器 238 240 :諧振電感 242 244 :諧振電容 Cdc 上臂開關控制線圈 下臂開關控制線圈 負載 :整流器 啟動電阻 交流開關元件 第一開關 第一限壓器 第二控制線圈 第三開關 一第三限壓器 第四控制線圈 轉向控制線圈 濾直流電容 穩壓電容 1322: Half-bridge converter 24; 26; Upper arm switch 28: 30: Lower arm switch 32: 210: AC power supply 211 212 _• Load 214 216: Starting capacitor 218 219: Discharge diode 220 222: First control coil 223 224: second switch 226 227: second voltage limiter 228 230: third control coil 231 232: fourth switch 234 236 • • fourth voltage limiter 238 240: resonant inductor 242 244: resonant capacitor Cdc upper arm switch control coil Lower arm switch control coil load: rectifier starting resistor AC switching element first switch first voltage limiter second control coil third switch first third voltage limiter fourth control coil steering control coil filter DC capacitor voltage regulator capacitor 13