經濟部中央標準局員工消費合作社印製 五、發明説明（1 ) 本發明係有關一種切換式高功因電源轉換器交流輸出 之電路系統，特別係有關一種利用接枝開關（graft switch) 原理，將兩級的功率轉換器之連接係併用一切換元件而成 爲一接枝功率處理器之切換式高功因電源轉換器交流輪出 之電路系統。 在習知的切換式高功因電源轉換器交流輸出之電路系 統中，爲增加功率轉換器功能，一般都採用兩級（或以上） 功率轉換器直接進行串聯或並聯。請參考第1圖，其爲習 知切換式高功因電源轉換器交流輸出之電路系統之簡單方 塊圖。在第1圖中，10代表交流輸出電路，其用以輸出交 流電源；11代表整流/濾波電路，其耦合於交流輸出電路 ίο，用以整流/濾波交流輸出電路10所輸出之交流電成爲 具良好波形之直流電；12代表直流/直流轉換器，其耦合 至整流/濾波電路11，一般爲功因校正或前置穩壓電路， 用以改善功因；13代表直流/交流轉換電路，其耦合至直 流/直流轉換器12，其可爲諧振式或PWM式轉換器，其用 以驅動如日光燈，放電燈，壓電元件，或使用在電焊機輪 出級；以及14代表交流負载，其由直流/交流轉換電路13 所推動。交流負裁14可爲電子安定器，超音波熔接機，超 音波洗淨機，或相類似負载。 在習知的做法中，喬克（‘Cuk)轉換器爲適用於直流/直 流轉換器12之電路之一。請參考第2圖，其爲喬克轉換器 之電路圖。在第2圖中，21代表切換元件，其可爲 MOSFET，BJT，IGBT或相類似元件；22代表電感；23 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） --------^--Ίί .裝 I:-----訂------.W (請先閲讀背面之注意事項再填寫本頁} 經濟部中央標隼局員工消費合作社印製 A7 B7 五、發明説明（2) 代表電容；24代表二極體；25代表電感；26代表電容。 於習知技術中，第1圖中之直流/交流轉換器13 —般 可用串聯諸振式半橋（series resonant Half-bridge)交流輸出 換流器，電流馈入諳振式推挽（c.urrent-fed resonant push-pull) 交流輸出換流器’及E類（class E)交流輸出換流器。 接著請參考第3a圖至第3c圖爲三種習知之直流/交流 轉換器之電路圖，其中第3a圖爲串聯謂振式半橋（series resonant Half-bridge)交流輸出換流器，第3b圖爲電流饋入 諳振式推挽（current-fed resonant push-pull)交流輸出換流 器，第3c圖爲E類（class E)交流輸出換流器。 請先參考第3a圖，其中，301與302代表切換元件； 303與304代表二極體；3〇5，307與308代表電容；以及 306代表電感。而14則代表交流負裁。 接著’請參考第3b圖，其中，311與312代表切換元 件，313代表電容；314代表變壓器；315與316代表電 感，以及317與318代表線圏。而14則代表交流負載。 接著，請參考第3c圖，其中，321代表切換元件；322 與323代表電容；324，325與326代表電容。而14則代 表交流負载。 在習知技術中，以高功因電子安定器爲交流負载，以 喬克轉換H爲纽/纽轉換器，以"諳振式半橋式交流 輸出換流器爲直流/交流轉換器爲例，如第4圖所示。由第 4圖可知上述的習知技術中之兩級的功率轉換器共用了三 個切換元件⑵，301，以及302)。交流負载㈣採用串 本紙張尺度適用中國國家榡準（CNs ) a4规格（210X 297公餐） ""= .—^ ^~^ -裝 « 訂 (請先閱讀背面之注意事項再填寫本頁) 聯諳振並聯負載之方式來趨動。 但因切換元件乃是昂貴元件，其對電路的成本有極大 影響。此外，習知技術還有下列之缺失：⑴零件多，使 電路之成本大，尤其是昂贵的切換元件對成本的影響更 大；（2)估用體積大，因習知技術所採用的變壓器是線性 式，其所伯的體積十分龐大；（3)其可靠度的維持相當繁 雜。 < '、 有錯於此，本發明之目的在於提出—種切換式⑽触 mode)高功因電源轉換器交流輸出之電路系統。該電路系 統將直流/直流轉換器與直流/交流轉換器利用接枝開關原 理合併成爲接枝功率處理級。藉此，可減少切換元件，儀 能元件，驅動電路與控制電路之元件數。本發明除了可保 有原先兩級轉換器之良好電路特性外，更具備成本低，體 積小，重量輕，可靠度提高等的優點。 爲讓本發明之上述目的、特徵、和優點能更明顯易懂， 下文特舉較佳實施例，並配合所附圖式，作詳細説明如下： 圖式之簡單説明： 第1圖爲習知技術之簡單方塊圖； 第2圖爲習知之喬克轉換器之電路圖； 經濟部中央標準局員工消費合作社印製 第3a圖至第3c圖爲三種習知之直流/交流轉換器之電 路圖，其中第3a圖爲串聯諳振式半橋交流輪出換流器，第 3b圖爲電流馈入諳振式推挽交流輸出換流器，第^圖爲e 類交流輸出換流器； 第4圖爲習知技術之系統電路圖； 本紙張尺度適用中國國家標隼（CNS ) A#規格（21〇><297公釐） A7 B7 五、發明説明（4 ) 第5圖爲本發明之簡單方塊圖； 第6圖爲本發明第一實施例之系統電路圖； 第7圖爲本發明第二實施例之系統電路圖；以及 第8圖爲本發明第三實施例之系統電路圖。 [符號説明] 10，20〜交流輸出電源；11，30〜整流器；12〜直流/ 直流轉換器；13〜直流/交流轉換器；14，5t)〜負载；21， 301，302，311，312，321 ，322，601，602 » 701， 702，801〜切換元件。 實施例 請參考第5圖，其爲本發明之簡單方塊圖。交流輸出 電源20所輸出之交流電經由橋式整電器30而處理成具良 好波形之直流電。之後再傳送至直流/直流轉換器41來進 行功因改善及直流/交流轉換器42來推動交流負裁50。 底下實施例將接枝功率處理級40内之41+42依喬克+ 串聯諳振式半橋交流輸出換流器，喬克+電流饋入諧振式 推挽交流輸出換流器，以及喬克+E類交流輸出換流器來做 詳細説明。 第一實施例 經濟部中央標準局員工消費合作社印製 (請先閲讀背面之注意事項再填寫本頁) 請參考第6圖，其爲本發明第一實施例之系統電路 圖。在第6圖中，20代表交流電源；30代表橋式整流器； 41代表喬克轉換器；42代表串聯諧振式半橋交流輸出換 流器；50代表交流負載；601 ，602代表切換元件； 603，604，605，606，607 代表二極體；.608，609， 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 經濟部中央標準局員工消費合作社印製 五、發明説明（5) 610 代表電感；611，617， 612，613，614代表電容。 由第6圖可看出，在太|0a、# ^ 本發月<第一實施例中，喬克轉 換器41與串聯諸振式半橋交流輪出換流器42間是併用= $疋件601而連接’省去了原本串騎振式半橋交流輪出 換流器的一切換元件（如第3a圖中的切換元件301)，並 在切換7G件6〇1 <兩邊分別連接可阻隔電壓與引導電流的 二極體603與二極體604。 ‘ 底下將説明本發明第一實施例之操作過程。 當切換元件6〇1導通，而切換元件6〇2截止時，此時 二極體605截止，而二極體6〇3與6〇4則導通。如此，則 原先儲存於電谷611上之能量會經由切換元件6〇1，電感 610及電容612而傳送至交流負载5〇。此時電容614開始 充電，而電容613則開始放電，原先儲存於電容613中之 说量經由電感608，電容611，切換元件6〇1，電感61〇， 以及電容612而傳至交流負裁％。藉由著電感61 〇，電容 612及電容613等之諳振作用而能產生交流負載5〇所需之 高頻交流訊號。 而當切換元件601截止’切換元件602導通時，則二 極體605導通，二極體604與二極體603截止。則電容611 及電容613開始充電。而原先儲存於電容614上之能量則 經由電容612 ’電感610而傳送至交流負裁50，再經切換 元件602 ’電感608及二極體605傳回電容614。藉由著 電感610，電容612及電容613等之諳振作用而能產生交 流負載50所需之高頻交流訊號。 (請先閲讀背面之注意事項再填寫本頁} 棄· . 言 Γ 本纸張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 經濟部中央標準局員工消費合作社印製 A7 B7 五、發明説明（6 ) ~~ :一 如此便完成-週期的切換動作。由第6圖中可知，本 發明之第一實施例只須2個切換元件（6()1，Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the invention (1) The present invention relates to a switching system of a high-power factor AC converter output circuit, and particularly relates to a principle using a graft switch. A two-stage power converter connection system and a switching element are used to form a switch-type high-power factor AC power converter circuit system of a grafted power processor. In conventional switching high power factor power converter AC output circuit systems, in order to increase the power converter function, two-stage (or more) power converters are usually used in series or parallel. Please refer to Figure 1, which is a simple block diagram of the circuit system of a conventional switching high power factor AC power converter. In Figure 1, 10 represents an AC output circuit, which is used to output AC power; 11 represents a rectifier / filter circuit, which is coupled to the AC output circuit, and used to rectify / filter the AC power output by the AC output circuit 10 to have a good Waveform DC; 12 represents a DC / DC converter, which is coupled to a rectifier / filter circuit 11, which is generally a power factor correction or pre-regulator circuit to improve the power factor; 13 represents a DC / AC conversion circuit, which is coupled to DC / DC converter 12, which may be a resonant or PWM converter, which is used to drive, for example, a fluorescent lamp, a discharge lamp, a piezoelectric element, or is used in the stage of a welding machine wheel; and 14 represents an AC load, which is provided by a DC / AC conversion circuit 13 is promoted. The AC negative cutter 14 may be an electronic ballast, an ultrasonic welding machine, an ultrasonic cleaner, or a similar load. In the known practice, a 'Cuk' converter is one of the circuits suitable for a DC / DC converter 12. Please refer to Figure 2 for the circuit diagram of the Jock converter. In the second figure, 21 represents a switching element, which can be a MOSFET, BJT, IGBT or similar element; 22 represents an inductor; 23 This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) ---- ---- ^-Ίί .Installation I: ----- Order ------. W (Please read the precautions on the back before filling out this page} Printed by the Staff Consumer Cooperative of the Central Bureau of Standards, Ministry of Economic Affairs A7 B7 V. Description of the invention (2) represents the capacitor; 24 represents the diode; 25 represents the inductance; 26 represents the capacitor. In the conventional technology, the DC / AC converter 13 in the first figure can generally use series vibration modes Series resonant half-bridge AC output converter, current fed into c.urrent-fed resonant push-pull AC output converter 'and class E AC output converter Please refer to Figures 3a to 3c for three conventional DC / AC converter circuit diagrams, where Figure 3a is a series resonant half-bridge AC output converter. Figure 3b shows the current-fed resonant push-pull AC output converter. Figure 3c shows E. Class E AC output converter. Please refer to Figure 3a, where 301 and 302 represent switching elements; 303 and 304 represent diodes; 30.5, 307 and 308 represent capacitors; and 306 represents inductance. And 14 represents the negative AC cut. Then 'refer to Figure 3b, where 311 and 312 represent switching elements, 313 represents capacitors; 314 represents transformers; 315 and 316 represent inductors, and 317 and 318 represent line coils. And 14 is Represents the AC load. Next, please refer to Figure 3c, where 321 represents the switching element; 322 and 323 represent the capacitor; 324, 325, and 326 represent the capacitor. 14 represents the AC load. In the conventional technology, a high power factor is used. The electronic ballast is an AC load, taking Jock's conversion H as a New Zealand / New Zealand converter, and "quoting half-bridge AC output converter as a DC / AC converter as an example, as shown in Figure 4. Fig. 4 shows that the two-stage power converter in the above-mentioned conventional technology shares three switching elements ⑵, 301, and 302). For AC load, adopt the standard paper size. Applicable to China National Standards (CNs) a4 size (210X 297 meals) " " = .— ^ ^ ~ ^ -Packing «Order (Please read the precautions on the back before filling this page ) It is actuated in the way of parallel vibration and parallel load. But because the switching element is an expensive element, it has a great impact on the cost of the circuit. In addition, the conventional technology has the following shortcomings: (1) The large number of parts makes the cost of the circuit large, especially the expensive switching components have a greater impact on cost; (2) the estimated volume is large, because the transformer used in the conventional technology is The linear form has a very large volume; (3) maintaining its reliability is quite complicated. < 'There is something wrong with this, the object of the present invention is to propose a circuit system of switching output (high-efficiency power converter AC output). This circuit system combines a DC / DC converter and a DC / AC converter using a graft switch principle to form a graft power processing stage. This can reduce the number of switching elements, instrumentation elements, drive circuits and control circuits. In addition to the good circuit characteristics of the original two-stage converter, the invention has the advantages of low cost, small size, light weight, and improved reliability. In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, the following describes specific embodiments in combination with the accompanying drawings in detail as follows: Brief description of the drawings: FIG. 1 is conventional A simple block diagram of technology; Figure 2 is a circuit diagram of a conventional Jock converter; Figures 3a to 3c printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs are three conventional DC / AC converter circuit diagrams. Figure 3a is a series oscillating half-bridge AC wheel output converter, Figure 3b is a current-fed oscillating push-pull AC output converter, and Figure ^ is a type e AC output converter; Figure 4 is System circuit diagram of conventional technology; This paper size is applicable to China National Standard (CNS) A # specification (21〇 > < 297 mm) A7 B7 V. Description of the invention (4) Figure 5 is a simple block diagram of the invention Figure 6 is a system circuit diagram of the first embodiment of the present invention; Figure 7 is a system circuit diagram of the second embodiment of the present invention; and Figure 8 is a system circuit diagram of the third embodiment of the present invention. [Symbols] 10, 20 ~ AC output power; 11,30 ~ Rectifier; 12 ~ DC / DC converter; 13 ~ DC / AC converter; 14,5t) ~ Load; 21, 301, 302, 311, 312 , 321, 322, 601, 602 »701, 702, 801 ~ switching elements. Example Please refer to FIG. 5, which is a simple block diagram of the present invention. AC output The AC power output from the power source 20 is processed into a DC power with a good waveform via the bridge rectifier 30. It is then sent to the DC / DC converter 41 for power factor improvement and the DC / AC converter 42 to drive the AC negative cut 50. In the following embodiment, 41 + 42 Ejock + series oscillating half-bridge AC output converters in the graft power processing stage 40, Jock + current-fed resonant push-pull AC output converter, and Jock + E type AC output converter for detailed explanation. First Embodiment Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling out this page) Please refer to Figure 6, which is a system circuit diagram of the first embodiment of the present invention. In Figure 6, 20 represents AC power; 30 represents bridge rectifier; 41 represents Jock converter; 42 represents series resonant half-bridge AC output converter; 50 represents AC load; 601 and 602 represent switching elements; 603 604, 605, 606, 607 represent diodes; .608, 609, This paper size applies to China National Standard (CNS) A4 (210X297 mm) Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5) 610 represents inductance; 611, 617, 612, 613, 614 represents capacitance. It can be seen from FIG. 6 that in the first embodiment of the present invention, the Jock converter 41 and the series-connected half-bridge AC wheel-out converter 42 are used in parallel. File 601 and connection 'eliminates a switching element (such as switching element 301 in Figure 3a) of the original string-riding half-bridge AC wheel-out converter, and switches 7G parts 601 < A diode 603 and a diode 604 that can block voltage and guide current are connected. 'The operation of the first embodiment of the present invention will be described below. When the switching element 601 is turned on and the switching element 602 is turned off, the diode 605 is turned off at this time, and the diodes 603 and 604 are turned on. In this way, the energy originally stored in the power valley 611 will be transmitted to the AC load 50 through the switching element 601, the inductor 610, and the capacitor 612. At this time, the capacitor 614 starts to charge, and the capacitor 613 starts to discharge. The amount originally stored in the capacitor 613 is transmitted to the negative AC cut rate through the inductor 608, the capacitor 611, the switching element 6〇1, the inductor 61 电容, and the capacitor 612. . The high-frequency AC signal required by the AC load 50 can be generated by the vibration of the inductor 61, capacitor 612, and capacitor 613. When the switching element 601 is turned off, the switching element 602 is turned on, and the diode 605 is turned on, and the diode 604 and the diode 603 are turned off. The capacitor 611 and the capacitor 613 start to charge. The energy originally stored in the capacitor 614 is transmitted to the negative AC 50 via the capacitor 612 ′ and the inductor 610, and then returned to the capacitor 614 via the switching element 602 ′ and the inductor 608 and the diode 605. The high-frequency AC signal required by the AC load 50 can be generated by the vibration of the inductor 610, the capacitor 612, and the capacitor 613. (Please read the precautions on the back before filling this page} Discard ·. Γ This paper size is applicable to China National Standard (CNS) A4 (210X297 mm) Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 5. Description of the invention (6) ~~: This completes the cycle-to-cycle switching action. As can be seen from FIG. 6, the first embodiment of the present invention requires only two switching elements (6 () 1,
驅動交流負載50之功效。 J I 第二實施例 請參考第7圖，其爲本發㈣二實施例之系、统電路 圖。在第7圖中’ 20代表交流電源；30代表橋式整流器； 41代表喬克轉換42代表電流饋人㈣式推挽交流輸 出換流器；50代表交流負载；7〇1，7 如，綱，期代表二極體；·，代表電^ 708，709代表變壓器712 一次側之第一，第二繞組線圖； 710 , 711代表電容；712代表變壓器。 由第7圖可看出，在本發明之第二實施例中，喬克轉 換器41與電流饋入諳振式推挽交流輸出換流器42間是併 用切換元件701而連接，省去了原本串聯諧振式半橋交流 輸出換流器42的一切換元件與一電感（如第3b圖中的切換 元件311與電感316)。並在切換元件7〇1之兩邊分別連接 可阻隔電壓與引導電流的二極體704與二極體705。 底下將説明本發明第二實施例之操作過程。 當切換元件701導通，而切換元件702截止時，此時 二極體703截止’而二極體704與705則導通。如此，則 原先错存於電容711上之能量釋放於變壓器7丨2上。就能 量的傳送路徑而言，一方面經由變壓器712 一次侧之第二 繞組709，電容710及切換元件701而送回電容711。另 一方面，則經由變壓器712 —次側之第一繞組708及切換 本紙張尺度適用中國國家標準（CNS > A4規格（210X297公釐） 1 · ~Ί ί' 裝 —，. ，tT- . (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 A7 B7 i、發明説明（7 ) 元件7〇1而傳回，則變壓器712之二次侧感應能量會經由 電感7〇7而傳至交流負载50。 藉由電容710，電感7〇7 ’及變壓器712之諳振作用 而產生推動交流負载50所需之高頻交流訊號。 而當切換元件701截止，切換元件702導通時，則二 極體703導通，而二極體704與二極體7〇5截止。此時， 能量經由電感706及二極體7〇3而傳送至變壓器712。一 方面’能量經由變壓器712 —次側之第二繞組709及切锋 元件7〇2而傳送至二極體703及電容711，再傳回橋式整 流器30。而另一方面，係經由變壓器7丨2 一次側之第一繞 組708及電容710，切換元件702，二極體7 〇3及電容711 傳回。 藉由電容710，電感707，及變壓器712之諧振作用 而產生推動交流負载50所需之高頻交流訊號。 如此便完成一週期的切換動作。由第7圖中可知，本 發明之第二實施例只須2個切換元件（7〇1，702)即可達成 驅動交流負载50之功效。 第三實施例 请參考第8圖，其爲本發明第三實施例之系統電路 圖。在第8圖中，20代表交流電源；30代表橋式整流器； 41代表喬克轉換器；42代表E類交流輸出換流器；50代 表文’"1負裁；801代表切換元件；802，803，804代表 二極體；805，806，807 代表電感；808，809，810， 811代表電容。 9 本纸張尺度剌t酬家縣（CNS)纟4驗（21GX297公廣） —i--------·1('袭------------,L·. C請先閲讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 A7 B7五、發明説明（8) 由第8圖可看出，在本發明之第三實施例中，喬克轉 換器41與E類交流輸出換流器42間是併用切換元件801 而連接，省去了原本E類交流輸出換流器42的一切換元件 與一電感（如第3c圖中的切換牟件321與電感322)。並在 切換元件801之兩邊分別連接可阻隔電壓與引導電流的二 極體803與二極體804。 底下將説明本發明第三實施例之操作過程。 當切換元件801導通時，此時二極體802截止，而二 極體803與804則導通。如此，則原先儲存於電容808上 之能量經由電感806再經由電容809及電感807而傳送至 交流負裁50，再經由二極體803與切換元件801而傳回， 此時，電容810開始充電。 藉由電容809，電容811及電感807之諳振作用而產 生推動交流負載50所需之高頻交流訊號。 而當切換元件801截止時，則二極體802導通，而二 極體803與二極體804截止。此時，原先儲存於電容810 上之能量傳送至交流負裁50，經由電感807及電容809而 傳回。而電容808則是電容810經由電感805及二極體802 所構成之迴路而充電。 藉由電容809，電容811及電感807之諳振作用而產 生推動交流負载50所需之高頻交流訊號。 如此便完成一週期的切換動作。由第8圖中可知，本 發明之第三實施例只須1個切換元件（801)即可達成驅動交 流負裁5 0之功效。 10 (請先閲讀背面之注意事項再填寫本頁) 本纸張尺度適用中國國家標準（CNS ) A4規格（210 X 297公釐） 五、發明説明（9 ) 本發明之上述三個實施例中，立 電流的之二極體(如第6圖中 微中爲阻隔電壓與引導 第？圖中的二極體_與;=體綱， 二核體_)可视情況而給予省略第8圖中的二極體咖與 本發明之上述三個實施例中， MOSFET，B;T或腦τ等電 彳^㈣元件可爲 广__，如此可：二第直:二':: 新加的直流/交流轉換器後連接直流負載。 若將本發明應㈣交流輸^多㈣、统，可藉由本發 明減少功因級，換流器級，電池充電級..等各子系統中之 切換元件，驅動電路與控制電路，對於成本的降低與 度的提昇有很大的助益。應用本發明將對產業的競爭力^ 很大的提昇，並可因成本下降而提高利潤。 經濟部中央標隼局員工消費合作社印策 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何熟習此項技藝者，在不脱離本發明之精 神和範圍内，當可作更動與潤飾，因此本發明之保護範^ 當視後附之申請專利範圍所界笔者爲準。 11 本紙張尺度適用中國國家標準（CNS ) A4規格（210 X 297公釐）The effect of driving AC load 50. J I Second Embodiment Please refer to FIG. 7, which is a circuit diagram of the second embodiment of the present invention. In Figure 7, '20 represents AC power; 30 represents bridge rectifier; 41 represents Jock conversion; 42 represents current-fed push-pull AC output converter; 50 represents AC load; 701, 7 The period represents a diode; ·, represents electricity ^ 708, 709 represents the first and second winding diagrams of the primary side of the transformer 712; 710, 711 represents a capacitor; and 712 represents a transformer. It can be seen from FIG. 7 that in the second embodiment of the present invention, the Jock converter 41 and the current-feeding oscillating push-pull AC output converter 42 are connected in parallel by using a switching element 701, eliminating the need for A switching element and an inductor (such as the switching element 311 and the inductor 316 in FIG. 3b) of the series resonant half-bridge AC output converter 42. A diode 704 and a diode 705 that can block the voltage and guide the current are connected to the two sides of the switching element 701, respectively. The operation of the second embodiment of the present invention will be described below. When the switching element 701 is turned on and the switching element 702 is turned off, the diode 703 is turned off 'and the diodes 704 and 705 are turned on. In this way, the energy originally stored in the capacitor 711 is released to the transformer 7 丨 2. In terms of the quantity transmission path, on the one hand, the capacitor 711 is returned via the second winding 709 on the primary side of the transformer 712, the capacitor 710, and the switching element 701. On the other hand, through the transformer 712-the first winding 708 on the secondary side and switching the paper size, the Chinese national standard (CNS > A4 specification (210X297 mm) 1 · ~ Ί ί 'installed —,., TT-. (Please read the precautions on the back before filling out this page) A7 B7 printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs i. Invention Description (7) Element 701 and returned, the secondary side induction energy of transformer 712 will be It is transmitted to the AC load 50 via the inductor 707. The high-frequency AC signal required to propel the AC load 50 is generated by the vibration effect of the capacitor 710, the inductor 707 'and the transformer 712. When the switching element 701 is turned off, When the switching element 702 is turned on, the diode 703 is turned on, and the diode 704 and the diode 705 are turned off. At this time, the energy is transferred to the transformer 712 through the inductor 706 and the diode 703. On the one hand, ' The energy is transmitted to the diode 703 and the capacitor 711 through the transformer 712-the second winding 709 and the cutting element 702 on the secondary side, and then back to the bridge rectifier 30. On the other hand, it is transmitted once through the transformer 7 丨 2 Side first winding 708 and capacitor 710, switched Piece 702, diode 703, and capacitor 711 are returned. The high-frequency AC signal required to drive the AC load 50 is generated by the resonance effect of the capacitor 710, the inductor 707, and the transformer 712. This completes one cycle of switching It can be seen from FIG. 7 that the second embodiment of the present invention only needs 2 switching elements (701, 702) to achieve the effect of driving the AC load 50. For the third embodiment, please refer to FIG. 8, which This is a system circuit diagram of the third embodiment of the present invention. In FIG. 8, 20 represents an AC power source; 30 represents a bridge rectifier; 41 represents a Jock converter; 42 represents a class E AC output converter; 50 represents a text '& quot 1 negative cut; 801 represents the switching element; 802, 803, 804 represents the diode; 805, 806, 807 represents the inductance; 808, 809, 810, 811 represents the capacitance. ) 纟 4 test (21GX297 public broadcasting) —i -------- · 1 ('Shocking ------------, L ·. C Please read the notes on the back before filling in (This page) Printed A7 B7 by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs 5. Description of the Invention (8) As can be seen in Figure 8, in the third implementation of the present invention In the example, the Jock converter 41 and the E-type AC output converter 42 are connected together by using a switching element 801, eliminating a switching element and an inductor of the original E-type AC output converter 42 (as shown in FIG. 3c). The switching element 321 and the inductor 322) are connected to the switching element 801, and a diode 803 and a diode 804 that can block voltage and guide current are connected to the two sides of the switching element 801. The operation of the third embodiment of the present invention will be described below. When the switching element 801 is turned on, the diode 802 is turned off, and the diodes 803 and 804 are turned on. In this way, the energy originally stored in the capacitor 808 is transmitted to the negative AC 50 through the inductor 806, then the capacitor 809 and the inductor 807, and then returned through the diode 803 and the switching element 801. At this time, the capacitor 810 starts to be charged . The high-frequency AC signal required to drive the AC load 50 is generated by the vibration of the capacitor 809, the capacitor 811 and the inductor 807. When the switching element 801 is turned off, the diode 802 is turned on, and the diode 803 and the diode 804 are turned off. At this time, the energy originally stored in the capacitor 810 is transmitted to the AC negative cutter 50, and is returned through the inductor 807 and the capacitor 809. The capacitor 808 is charged by the capacitor 810 through a loop formed by the inductor 805 and the diode 802. The high-frequency AC signal required to drive the AC load 50 is generated by the vibration of the capacitor 809, the capacitor 811 and the inductor 807. This completes a cycle of switching actions. It can be seen from FIG. 8 that the third embodiment of the present invention only needs one switching element (801) to achieve the effect of driving the negative 50 of the alternating current. 10 (Please read the notes on the back before filling out this page) The paper size applies to the Chinese National Standard (CNS) A4 (210 X 297 mm) 5. Description of the invention (9) In the above three embodiments of the invention The diode of the vertical current (such as the blocking voltage and the guide in Figure 6 in the micrograph in Figure 6), the diode _and in the figure? And the body class, the dinuclear body _ can be omitted according to the situation. Figure 8 In the above two embodiments of the present invention and the above-mentioned three embodiments of the present invention, electrical elements such as MOSFET, B; T or brain τ can be wide __, so it can be: second straight: second ':: Connect a DC load after the DC / AC converter. If the present invention is applied to multiple AC systems, the power factor stage, the inverter stage, the battery charging stage, etc. can be reduced by the present invention, such as switching elements, driving circuits and control circuits in each subsystem. The reduction and improvement of the degree will greatly help. The application of the present invention will greatly improve the competitiveness of the industry ^ and increase profits due to cost reduction. Although the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art will not depart from the spirit and scope of the present invention. When it can be modified and retouched, the scope of protection of the present invention ^ shall be determined by the author within the scope of the appended patent application. 11 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)