4 6 9 75 2 A7 B7 Γ ~ 1 -—-- 五、發明説明（ί ) 1.發明背景 電子式安定器目前市面產品甚多，但眾所皆知者，其 最大之缺點為壽命短’溫度高，效率低，價格高之缺點， 雖然大部份之電子式安定器皆採用半橋式振盪器（Half Bridge oscilhuor)電路，但其電子電路之設計若不理想， 則其壽命將党影響’因此電子式安定器在市面上仍無法普 遍推行’有鑑於此，發明人自美國學成回國後即在實驗室 研究電子式安定器，經歷三年多試驗了多種電子電路，才 研究成功本發明電路，其具有壽命長，價格低，效率高及 雜訊小及完整之電路保護設施等，因習用之功率因數 (Power factor)改善電路不論為積體電路型或諧振電路型均 已相當成熟，因此並不列入本發明之電路中討論，但本發 明亦不排斥應用功率因數改善電路于本發明電路中·> 2.發明概述： 本發明設有A字型保護屬路，全波或倍壓整流電路， 半橋式振盪電路，矽控整流器保護電路及負載五大部份， 茲分述於下： Α· A字型保護電路：為由負溫度係數電阻（Negative Temperature Coefficient Resistor, NTC)，正溫度係數電 MCPositive Temperature Coefficient Resiscor, PTC)，高 頻擴波電容器及突波吸收器（Mars-on Varistars，MOV)等 元件組成；其有三個接點’其中二個接點接電源，一個 接點接共同接地（Common Ground)，其形像A字型故名 A字型保護電路，NTC之作用為供本發明柔性啟動之用 5 PTC之作用為供本發明電路發生短路時，由PTC產 I ^------^ (請先閱讀背面之注意事項再填萬本頁) 752 A7 B7 經濟部中央標荜局員工消费合作杜印製 五、發明説明（2 ) 生高溫高電阻特性來保護，若依安規需求本發明亦加裝 有保險絲或溫度保險絲以加強本電路之保護。 B. 全波或倍壓整流電路：為由一選擇開關’四只整流二極 體，二只濾波電容器及負載電阻所組成：由選擇開關決 定選用全波整流電路或倍壓整流電路以提供負載之所需 而定，其作用為提供本發明電路之直流電源之所需。 C. 半橋式振盪電路為由二只電晶體或MOSFETS ，電晶體 之基極（Base)或MOSFET之閘極（Gate)電子控制電路， 振盪線圈，諧振電感器，諧振電容器及激發電路所組成 :其目的在使直流電源變換為自400Hz到200KHZ間之 弦波電壓，以提供日光燈所需之電能。 D. 矽控整流器保護電路：為由矽控整流器，分壓電阻，檢 測電阻（Detection Resistor)及濾波電容器所組成；其目 的在保護半橋式振盪電路及日光燈之安全。 E. 日光燈：為家庭與工廠照明常用之燈管，本發明亦不排 除應用於高壓鈉燈（High Pressure Sodium Lamps)或複金 屬燈（Metal Haliote Lamps)為負載。 茲為說明本發明動作原理容易起見，提供下列各圖’ 並標示有元件符號及發明詳細說明內有符號之意義； 圖丨所示為習知電子式安定器之例舉電路之一。 圖2所示為習知電子式安定器之例舉電路之二。 圖3所示為本發明新電子式安定器之裝置方塊圖。 圖4所示為本發明新電子式安定器之裝置電路圖。 本纸&尺度遇用中國國家標羋（CMS ) A4規格（210X297公釐） I-------¥------.玎 (請先閲讀背面之注意事項再填寫本頁) 4 69 75 2 A7 B7 五、發明説明（3 ) 3.發明的詳細說明： (請先閲讀背面之注意事項再填寫本頁) 如圖1所示為習知電子式安定器之一例之電路圖，其 與本發明圖4所示最大不同點在習知電子式安定器沒有A 字型保護電路，習知半橋式振盪電路之電晶體基極之 電子控制電路與本發明半橋式振盪電路300所用之電子控制電 路不同；習知電子式安定器沒有設矽控整流器保護電路400， 由此三種比較即可瞭解本發明與習知電子式安定器不同。 如圖2所示為習知之電子式安定器之另一例電路圖， 其與本發明圖4所示最大不同點在習知電子式安定器沒有 A字形保護電路100 ;習知半橋式振盪電路之MOSFETS 之閘極之電子控制電路採屏如圖2所示之特製集體電路， 其與圖4本發明之電子控制電路不同；習知電子式安定器 沒有設矽控整流器保護電路4〇〇，由此三種比較即可瞭解 本發明與習知之電子式安定器不同。 如圖3所示為本發明之方塊圖，其由A字型保護電路 100，全波或倍壓整流電路200，半橋式振盪電路300， 矽控整流器保護電路400與負載5⑼等五部份所組成。 如圖4所示，交流電源(A.C power source)之一端經保險 絲108，至NTC 102及高頻濾波電容器103，MOV 105，交 流電源之另一端經PTC 101至高頻濾波電容器丨03與MOV 104，剛開始NTC 102之電阻值大，此時交流電源流經全 波或倍壓整流電路200之電流受控於NTC 101之電阻值， 因此本發明之啟動電流完全受本發明之NTC 101所控制， 如此本發明可以得一安全之啟動電流’同時PTC 10!因啟 動電流受到限制，因此PTC ίΟΙ所流過之電流小，故PTC i〇!不產生高溫度，而PTC 101維持在小電阻狀態，當 本紙張尺度通用t國國家揉準（CNS M4说格（2ί〇Χ297公釐） 4 嗖濟部中夬標隼帋員工消費合泎/ii印ί 69 752 A7 _B7_ 五、發明説明（Zf ) NTC 1G2因電流通過之關係，其電阻值逐漸下降，相對的 電流也逐漸上昇，此作用即達成電路之柔性啟動（Soft Start)之目的，此即有效的限制湧流（Inrush Current)而避免 造成電路之損壞，同時亦達到日光燈不易黑化之目的，若 交流電源載有高頻電波，此時高頻電波借高頻瀘波電容器 103自電源之一端再回到交流電源之另一端，而不出現於本 發明電路，若此時交流電源帶有雷擊波，此時雷擊波經由 MOV 104或MOV 105而經共同接地端與大地連接，此時電擊 波不出現於本發明電路，因其SIDAC (Silicon Bi-directional Diode ThydstoO與MOV特性相接近，若因需要本發明亦 不排除以SICAC替代MOV，若本發明電路除A字型保護電 路1〇〇外，其他發生短路或過負載(over loading)時，PTC 101 因大電流之關係，其PTC 101之電阻值甚大足以限制電路 電流之增加，以達到保g本發明電路之目的，而保護絲 108亦可設定在某電流值_時燒燬，以保護本發明電路之安 全，當然亦可用熱保險絲以取代保險絲108 ，其為達到柔 性啟動之效能其NTC 102亦可再並聯另一 NTC 107，當然 亦可串聯一 NTC再與NTC 102串聯，其原因為NTC 102之 規格少，為達到一定之柔性啟動效果，不得不採用串並聯之 方式；同理，PTC 101可以採用與另一PTC 106並聯，可 採用串並聯方式，以應負載之需要。 如圖4所示，當選擇開關S (201)往1接通時，其二極 體202. 203, 204與205構成全波整流電路，當選擇開關 S(201)往2接通時，其二極體202, 204，濾波電容器206, 207構成倍壓整流電路，其在整流電路之正負電端，即為 半橋式振盪電路300之直流電源供應端，為了安規之需求 本紙乐尺度逍用中國國家標準（CNS ) Α4規格（210X297公釐） ^-- {請先Μ讀背面之注意事項再填寫本頁) 訂 4 6 9 75 2 A7 B7 經濟部中央樣孳馬員工消費合作，钍印- 五、發明説明（5) ，設有與正負電端並聯之負載電阻208 ，以使正負電端在 交流電源停止供應時，其電位達到最低。 如圖4所示*半橋式振盪電路300由激發電路，電子 控制電路及諧振電路所組成，激發電路是由時間常數電阻301 ，時間常數電容3G2，激發二極體303，激發Diac 3〇4及第 二MOSFET 306所組成，電子控制電路分有二組，第一組 由第一MOSFET 305 ，第一閘極電阻3 13 ，第一Zener4 6 9 75 2 A7 B7 Γ ~ 1 ----- V. Description of the invention (ί) 1. Background of the invention Electronic ballasts are currently on the market with many products, but as everyone knows, the biggest disadvantage is short life. The disadvantages of high temperature, low efficiency, and high price. Although most electronic ballasts use Half Bridge oscilhuor circuits, if the design of the electronic circuit is not ideal, its life will affect the party. 'Therefore, electronic ballasts are still not universally available in the market.' In view of this, the inventor has researched electronic ballasts in the laboratory since he returned to the United States after studying in the United States. After more than three years of testing a variety of electronic circuits, he successfully studied Invented circuit, which has long life, low price, high efficiency, low noise and complete circuit protection facilities, etc. Because of the conventional power factor improvement circuit, whether it is integrated circuit type or resonant circuit type, it is quite mature Therefore, it is not included in the discussion of the circuit of the present invention, but the present invention does not exclude the application of a power factor improvement circuit in the circuit of the present invention > 2. Summary of the invention: The present invention is provided with an A-shaped It belongs to the following five parts: full-wave or double-voltage rectifier circuit, half-bridge oscillating circuit, silicon-controlled rectifier protection circuit and load, which are described below: Α · A-shaped protection circuit: Negative Temperature Coefficient Resistor (NTC), positive temperature coefficient (MCPositive Temperature Coefficient Resiscor, PTC), high frequency expansion capacitors and surge absorbers (Mars-on Varistars (MOV)) and other components; it has three contacts' two of them A contact is connected to a power source, and a contact is connected to a common ground. Its shape is an A-shaped protection circuit. The function of NTC is for the flexible starting of the present invention. 5 PTC is used for the circuit of the present invention. In the event of a short circuit, produced by PTC I ^ ------ ^ (Please read the precautions on the back before filling in this page) 752 A7 B7 Printed by the Consumers' Co-operation of the Central Bureau of Standards, Ministry of Economic Affairs 2) It is protected by high temperature and high resistance. If required by the safety regulations, the invention also adds a fuse or a temperature fuse to strengthen the protection of the circuit. B. Full-wave or double-voltage rectifier circuit: It consists of a selection switch, four rectifier diodes, two filter capacitors, and load resistance: The full-wave rectifier circuit or double-voltage rectifier circuit is selected by the selection switch to provide the load. It is required to provide the DC power for the circuit of the present invention. C. Half-bridge oscillation circuit is composed of two transistors or MOSFETS, the base of the transistor or the gate of the MOSFET electronic control circuit, the oscillating coil, the resonant inductor, the resonant capacitor and the excitation circuit : Its purpose is to make the DC power supply into a sine wave voltage from 400Hz to 200KHZ to provide the power required for fluorescent lamps. D. Silicon controlled rectifier protection circuit: It is composed of silicon controlled rectifier, voltage divider resistor, detection resistor and filter capacitor; its purpose is to protect the safety of half-bridge oscillation circuit and fluorescent lamp. E. Fluorescent lamps: Lamps commonly used in home and factory lighting. The present invention does not exclude high pressure sodium lamps (Metal Haliote Lamps) used as loads. To make it easy to explain the operation principle of the present invention, the following figures are provided, and the symbols of the components and the meaning of the symbols in the detailed description of the invention are provided. Figure 丨 shows one of the exemplary circuits of the conventional electronic ballast. FIG. 2 shows the second exemplary circuit of a conventional electronic ballast. FIG. 3 is a block diagram of the device of the new electronic ballast of the present invention. FIG. 4 shows a circuit diagram of the device of the new electronic ballast of the present invention. This paper & scale meets China National Standard (CMS) A4 specification (210X297 mm) I ------- ¥ ------. 玎 (Please read the precautions on the back before filling this page ) 4 69 75 2 A7 B7 5. Description of the invention (3) 3. Detailed description of the invention: (Please read the notes on the back before filling out this page) Figure 1 shows the circuit diagram of an example of a conventional electronic ballast The biggest difference from the present invention shown in FIG. 4 is that the conventional electronic ballast does not have an A-shaped protection circuit, the electronic control circuit of the transistor base of the conventional half-bridge oscillation circuit and the half-bridge oscillation circuit of the present invention. The electronic control circuit used in 300 is different; the conventional electronic ballast is not provided with a silicon controlled rectifier protection circuit 400. From the three comparisons, it can be understood that the present invention is different from the conventional electronic ballast. Figure 2 shows another example circuit diagram of the conventional electronic ballast. The biggest difference from the conventional ballast shown in Figure 4 of the present invention is that the conventional electronic ballast does not have an A-shaped protection circuit 100; the conventional half-bridge oscillator circuit The electronic control circuit of the gate of the MOSFETS adopts a special collective circuit as shown in Figure 2, which is different from the electronic control circuit of the present invention shown in Figure 4. The conventional electronic ballast does not have a silicon-controlled rectifier protection circuit 400. These three comparisons show that the present invention is different from the conventional electronic ballast. Figure 3 shows a block diagram of the present invention, which consists of five parts, such as A-shaped protection circuit 100, full-wave or double voltage rectifier circuit 200, half-bridge oscillating circuit 300, silicon-controlled rectifier protection circuit 400, and load 5⑼. Composed of. As shown in Figure 4, one end of the AC power source passes through fuse 108 to NTC 102 and high-frequency filter capacitor 103, MOV 105, and the other end of AC power source passes PTC 101 to high-frequency filter capacitor 03 and MOV 104 At the beginning, the resistance of NTC 102 is large. At this time, the current of the AC power flowing through the full-wave or voltage doubler rectifier circuit 200 is controlled by the resistance of NTC 101. Therefore, the starting current of the present invention is completely controlled by the NTC 101 of the present invention. In this way, the present invention can obtain a safe starting current. At the same time, PTC 10! Is limited by the starting current, so the current flowing through PTC ΙΟΙ is small, so PTC i〇! Does not generate high temperature, and PTC 101 is maintained in a small resistance state. When the size of this paper is in accordance with the standard of the country and country (CNS M4) (2ί297 × 297 mm) 4 Ministry of Economic Affairs of the People's Republic of China Standard for Employee Consumption / II India 69 752 A7 _B7_ V. Description of the Invention (Zf ) NTC 1G2's resistance gradually decreases due to the passage of current, and the relative current gradually increases. This function achieves the purpose of soft start of the circuit, which effectively limits the inrush current and avoids the inrush current. The circuit is damaged, and the purpose of the fluorescent lamp is not easily blackened. If the AC power source carries high-frequency waves, at this time, the high-frequency waves are returned from one end of the power source to the other end of the AC power source by the high-frequency chirp capacitor 103. Appears in the circuit of the present invention. If the AC power supply has a lightning wave at this time, then the lightning wave is connected to the earth through the common ground terminal via MOV 104 or MOV 105. At this time, the electric shock wave does not appear in the circuit of the present invention because of its SIDAC ( Silicon Bi-directional Diode ThydstoO has similar characteristics to MOV. If the present invention is needed, it does not exclude the replacement of MOV by SICAC. If the circuit of the present invention is short-circuited or overloaded in addition to the A-shaped protection circuit 100, At this time, due to the large current, the resistance of PTC 101 is very large enough to limit the increase of circuit current to achieve the purpose of protecting the circuit of the present invention, and the protection wire 108 can also be set to burn at a certain current value. To protect the safety of the circuit of the present invention, of course, it is also possible to replace the fuse 108 with a thermal fuse. In order to achieve the effect of flexible starting, the NTC 102 can also be connected in parallel with another NTC 107. Of course One NTC can be connected in series with the NTC 102. The reason is that the NTC 102 has few specifications. In order to achieve a certain flexible start-up effect, it must be connected in series and parallel. Similarly, PTC 101 can be connected in parallel with another PTC 106. It adopts series-parallel mode to meet the needs of the load. As shown in Figure 4, when the selection switch S (201) is turned to 1, its diodes 202. 203, 204 and 205 constitute a full-wave rectifier circuit. When the selection switch When S (201) is turned on, its diodes 202, 204 and filter capacitors 206 and 207 form a voltage doubler rectifier circuit. The positive and negative electrical terminals of the rectifier circuit are the DC power supply of the half-bridge oscillating circuit 300. In order to meet the requirements of safety regulations, the paper scale is free to use the Chinese National Standard (CNS) Α4 specification (210X297mm) ^-{Please read the precautions on the back before filling this page) Order 4 6 9 75 2 A7 B7 Economy The central government's sample consumer cooperation, seal-V. Description of the invention (5), a load resistor 208 is provided in parallel with the positive and negative electrical terminals, so that the potential of the positive and negative electrical terminals reaches the lowest level when the AC power supply is stopped. As shown in Figure 4 * The half-bridge oscillation circuit 300 is composed of an excitation circuit, an electronic control circuit, and a resonance circuit. The excitation circuit is composed of a time constant resistor 301, a time constant capacitor 3G2, an excitation diode 303, and an excitation diode 304. And the second MOSFET 306, the electronic control circuit is divided into two groups, the first group consists of the first MOSFET 305, the first gate resistance 3 13, the first Zener
Diode 312，第一限流電阻 310，第二 Zener Diode 311 及第一 振盪線圈307所組成；第二組由第二M0SFET 306，第二閘極 電阻3 17，第三Zener Diode 3 16，第二限流電阻3 14，第四 Zener Diode 315及第二振盪線圈309所組成；諧振電路是由 第三振盪線圈308，諧振線圈1321，第一諧振電容320及 第2諧振電容318所組成；當直流電源開始供應半橋式振 盪電路3⑽時，其直流電源往-時間常數電阻301及時間常 數電容302充電，當時間常數電容302之電壓約為32V時 激發Diac304導通（Turn on)，此時激發二極體3〇3供應直 流電壓於第二M0SFET 306之受極（Drain) ’而第二 MOSFET 306之源極（source)，與時間常數電容器302共地 端，因此當Diac 304導通時，第二M0SFET 3 06之閘極受 有電壓，因此第二M0SFET 3〇6亦為導通狀態’同時半橋 式振盪電路動作開始；當第三振盪線圈30S導通時，其若 ’設第一振盪線圈307之上端因受感應產生一正電壓，此時 感應電壓經第一限流電阻3 10，第一 Zener Diode 3 12而到 達第一 M0SFET 305之閘極，此時第一 M0SFET 305之 受極與源極呈導通狀態，因設定振盪線圈極性之關係，其 第一振盪線圈3〇7與第二M0SFET 306為截斷（Turn OFF) 本紙法尺度適用t國國家禕準（CNS ) A4規格（2〖0X 297公釐） ^------V (請先Μ讀背面之注意事項再填寫本頁) 4 69 75 2 A7 B7 五、發明説明（6 ) *同樣的當第一MOSFET 305截斷時，第二！MOSFET 306 為導通，如此動作形成一FHp-Flop電路，而產生振盪，當 第一振盪線圈307之上端產生突波電壓時，其突波電壓經 第一限流電阻310到第二Zener Diode 311 ，而被第二 經濟部令央螵準曷員工消资合作社印装 裝-- (請先閲讀背面之注意事項再填寫本頁)Diode 312, the first current limiting resistor 310, the second Zener Diode 311 and the first oscillating coil 307; the second group consists of the second MOSFET 306, the second gate resistor 3 17, the third Zener Diode 3 16, the second The current-limiting resistor 314, the fourth Zener Diode 315, and the second oscillating coil 309; the resonant circuit is composed of a third oscillating coil 308, a resonant coil 1321, a first resonant capacitor 320, and a second resonant capacitor 318; When the power starts to supply the half-bridge oscillation circuit for 3 hours, its DC power is charged to the time constant resistor 301 and the time constant capacitor 302. When the voltage of the time constant capacitor 302 is about 32V, Diac304 is turned on (Turn on). The pole body 30 supplies a DC voltage to the drain of the second MOSFET 306 and the source of the second MOSFET 306 is in common with the time constant capacitor 302. Therefore, when Diac 304 is turned on, the second The gate of M0SFET 3 06 receives voltage, so the second M0SFET 3 06 is also on. At the same time, the operation of the half-bridge oscillation circuit starts; when the third oscillation coil 30S is on, if it is set to the first oscillation coil 307 Upper end A positive voltage is generated upon induction. At this time, the induced voltage reaches the gate of the first M0SFET 305 through the first current limiting resistor 3 10 and the first Zener Diode 3 12. At this time, the acceptor and the source of the first M0SFET 305 are turned on. State, due to the polarity of the oscillating coil, the first oscillating coil 307 and the second M0SFET 306 are turned off (Turn OFF) This paper method is applicable to the national standard (CNS) A4 standard (2 〖0X 297 mm ) ^ ------ V (Please read the notes on the back before filling in this page) 4 69 75 2 A7 B7 V. Description of the invention (6) * Similarly, when the first MOSFET 305 is turned off, the second! The MOSFET 306 is turned on, so that an FHp-Flop circuit is formed, and oscillation occurs. When a surge voltage is generated at the upper end of the first oscillation coil 307, the surge voltage passes through the first current limiting resistor 310 to the second Zener Diode 311. It was printed by the Order of the Second Ministry of Economic Affairs of the Central Government's Employees Cooperatives-(Please read the precautions on the back before filling this page)
Zener Diode 311之Zener Vo丨fage限制之上之電壓傍路到 第一 MOSFET 305之源極，而不出現於閘極，而其第二 Zener Diode 311 之下限電壓經第一Zener Diode 312，而 此時若超過Zener Diode 312之上限電壓則到達閘極，而其 第一Zener Diode 312之下限電壓則無法到達閘極，舉例於 說明如下：若設第一Zener Diode 312之Zener Voltage為 2V，而第二 Zener Diode 3:11 之 Zener Diode Voltage 為 7V ，則出現在第一MOSFET 305閘極之電壓為2V至7V之間 ，閘極之電壓可由第一閘極電阻313之兩端測量之，由此 可知其突波及脈波之上昇被與下降波永遠不出現於第一 MOSFET 305之閘極：第二組電子控制電路與第一組控制 電路完全相同，因此其動作原理與功能亦皆相同，而不多 述；諧振電路當第一組與第二組電子電路與激發電路配合 執行Flip-Flop狀態時，諧振電路之第三振盪線圈308，振 •盪線圈321，第一諧振電容302與第二諧振電容3丨8亦開 始配合執行振盪之動作，其振盪頻率的高低，依第三振盪 線圈308之電感量，第二諧振電容318非常大於第一諧振 電容302之電容量，因此本發明即是利用第一諧振電容 320之小電容量大阻抗之特性，而在第一諧振電容320之 兩端得到大之日光燈500點火電壓’而執行日光燈500之點 亮動作，其點火電壓依日光燈500之特性而定，一般皆在 700VAC以上，在此必需強調的是本諧振電路屬串聯諧振電 本紙伕尺度通用中國國家標準（CNS 現格（210X29：?公釐) 469752 A7 B7 __ 五、發明説明（7 ) 路特性，而其諧振電阻319並聯於第一諧振電容320之雨 端，使第一諧振電容320之兩端電壓得以控制。 如圖4所示，矽控整流器保護電路4〇〇是由檢測電阻 4W護得半橋式振盪電路300及日光燈500所使用之總和 電流，因此在檢測電阻405之兩端得一參考電壓而供應於 分壓電阻401，402，其矽控整流器4〇4之閘極電壓則自 分壓電阻401 ，402之中點取得，其閘極取得之電壓經並 聯連接之濾波電容403給予電壓平滑化，若半橋式振盪電 路300或日光燈500發生短路或過載時，其檢測電阻405 兩端之電壓上昇，使矽控整流器404之閘極得一使矽控整 流器404導通（Turn on)之電壓，此時矽控整流器404之陽 極（Anode)與陰極（Cathode)導通，此時因陽極接於半橋式 振盪電路300之第一M0SFET 306之源極與第二M0SFET 306受極間，因而使半橋式振盪電路300之振盪動作停止 ，而達到保護半橋式振盪電路3⑽與日光燈500之效果， 當半橋式振盪電路300或日光燈500之故障排除後，再重 新啟動交流電源，而恢復本發明之正常動作。 如圖4所示，本發明電路以日光燈500為負載，因日 光燈500屬放電管（Discharge Tube)之一，因此本發明亦可 應用於其他放電管或其他相關之電路應用。 ----------^------1T (請先®讀背面之注意事項再填寫本頁) 本紙乐尺度適用中国國家榇準（CNS ) A4規格（2ί〇Χ 29?公釐）The voltage above the Zener Vofage limit of Zener Diode 311 is bypassed to the source of the first MOSFET 305 without appearing at the gate, and the lower limit voltage of its second Zener Diode 311 passes through the first Zener Diode 312, and this If it exceeds the upper limit voltage of Zener Diode 312, it will reach the gate, but the lower limit voltage of its first Zener Diode 312 cannot reach the gate. For example, the description is as follows: If the Zener Voltage of the first Zener Diode 312 is 2V, and the first The Zener Diode Voltage of the second Zener Diode 3:11 is 7V, then the voltage of the gate of the first MOSFET 305 is between 2V and 7V, and the voltage of the gate can be measured by the two ends of the first gate resistor 313. It can be seen that the rise and fall of the surge and pulse waves never appear on the gate of the first MOSFET 305: the second group of electronic control circuits is exactly the same as the first group of control circuits, so their operating principles and functions are also the same, and Not to elaborate; when the first group and the second group of electronic circuits and the excitation circuit cooperate to perform the Flip-Flop state, the third oscillation coil 308, the oscillation coil 321, the first resonance capacitor 302 and The second resonant capacitor 3 丨 8 also starts to perform the operation of oscillation. The level of its oscillation frequency depends on the inductance of the third oscillation coil 308. The second resonant capacitor 318 is very much larger than the capacitance of the first resonant capacitor 302. Therefore, the present invention is It uses the characteristics of small capacitance and large impedance of the first resonant capacitor 320, and obtains the ignition voltage of the large fluorescent lamp 500 at both ends of the first resonant capacitor 320 to perform the lighting operation of the fluorescent lamp 500. The ignition voltage of the fluorescent lamp is according to that of the fluorescent lamp 500. Depending on the characteristics, generally above 700VAC, it must be emphasized here that this resonant circuit is a series resonant electrical paper. The general Chinese national standard (CNS is now (210X29:? Mm) 469752 A7 B7 __ V. Description of the invention ( 7), and its resonance resistance 319 is connected in parallel to the rain terminal of the first resonance capacitor 320, so that the voltage across the first resonance capacitor 320 can be controlled. As shown in FIG. 4, the silicon controlled rectifier protection circuit 400 is composed of The detection resistor 4W protects the total current used by the half-bridge oscillating circuit 300 and the fluorescent lamp 500, so a reference voltage is obtained at both ends of the detection resistor 405 and supplied to the voltage dividing resistor 40. 1,402, the gate voltage of its silicon-controlled rectifier 400 is obtained from the midpoint of the voltage-dividing resistors 401 and 402, and the voltage obtained by its gate is smoothed by the filter capacitor 403 connected in parallel. When the circuit 300 or the fluorescent lamp 500 is short-circuited or overloaded, the voltage across the detection resistor 405 rises, so that the gate of the silicon-controlled rectifier 404 has a voltage that turns on the silicon-controlled rectifier 404. At this time, the silicon-controlled rectifier 404 The anode (Anode) and cathode (Cathode) are turned on. At this time, because the anode is connected between the source of the first MOSFET 306 of the half-bridge oscillating circuit 300 and the receiver of the second MOSFET 306, the half-bridge oscillating circuit 300 The oscillating operation is stopped to achieve the effect of protecting the half-bridge oscillating circuit 3⑽ and the fluorescent lamp 500. When the failure of the half-bridge oscillating circuit 300 or the fluorescent lamp 500 is eliminated, the AC power is restarted to resume the normal operation of the present invention. As shown in FIG. 4, the circuit of the present invention uses a fluorescent lamp 500 as a load. Since the fluorescent lamp 500 is one of the discharge tubes, the present invention can also be applied to other discharge tubes or other related circuit applications. ---------- ^ ------ 1T (Please read the notes on the back before filling this page) The paper scale is applicable to China National Standard (CNS) A4 specification (2ί〇Χ 29 ? Mm)