TW398110B

TW398110B - Adjustable 3-phase voltage buck-and-boost AC/DC converter

Info

Publication number: TW398110B
Application number: TW87110224A
Authority: TW
Inventors: Ching-Tsai Pan; Jen-Jung Shie
Original assignee: Pan Ching Tsai; Shie Jen Jung
Priority date: 1998-06-24
Filing date: 1998-06-24
Publication date: 2000-07-11

Abstract

This invented device consists of a conventionally used power semi-conductor switch, electric inductor, capacitor and a set of converter control circuit. It converts the input 3 phase AC power source to a DC voltage output. Another feature is the utilization of balanced 3-phase voltage. Its 120-degree phase shift to each other different six zones for the balanced 3-phase voltage within one cycle the positive and negative peak voltages for each phase. According to the characteristic for the different zones, the conductive status of the six semi-conductor switching elements for 3 phase full bridge type inverter structure is determined. Input side 3 phase currents are all sinusoidal waves with unit power factors that obtains a voltage DC output voltage.

Description

A7 B7 經濟部中央標準局員工消費合作社印裝五、發明説明（1 ) 有關本發明申請之一主要動機，乃是申請人之一有鑑於目前國家正大力推動智慧財產權之觀念，且國內業界亦受到國外極大之壓迫，因此，特別將其所指導之博士班學生之一些成果，於發表至國際上學術期刊之前，先行提出申請，俾有助於建立本土化技術，同時另一方面從教育之觀點，可以讓學生了解專利申請之過程，且藉讓其分享成果，更可以激勵其爾後之創造發明能力，爰有本發明之申請。本發明係關於三相交流變直流之轉換器，特別係關於僅需使用單級轉換器即可獲得高效率之三相升/降壓交流變直流之轉換器，尤指同時兼具備各相電流均爲弦波且爲單位功率因數。這裡所提及之具備單位功率因數之三相交流變直流轉換器係用於譬如是直流馬達驅動器，直流鏈接型交流變交流轉換器之前級，或是需要穩定之直流電源供電之類者。一般習用之三相交流變直流轉換器，其功率因數常因負載輕重之不同而變化甚大，且諧波舍量甚多，若需另兼具有升/降壓之功能者通常需要兩級轉換器串接以達成。即第一級先做整流及功因校正，第二級則爲另一個直/直流轉換器（DC/DC CONVERTER)以供具升/降壓功能之直流電壓，因此甚不易達到很高的效率。圖一所示即爲目前相關文獻常見之單級三相降/ 升壓交流變直流轉換器架構，其中a相之輸入電壓與未經高頻濾波器之輸入電流波形如圖二所示。雖然此種型式之三相交流變直流轉換器亦具升/降壓功能，然而由於輸入a流工作在不連續模式，所以各元件除必需有較高之額定電壓與電流峰値應力， 3 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） J---------\裝— (請先聞讀背面之注意事項再填寫本頁) 訂線經濟部中央標準局貝工消費合作社印製 A7 B7 五、發明説明（2) 因而造成各元件之有效利用率較低且嚴重的電磁干擾.、諧波污染及較低的功率因數。此外，需外加額外之高頻輸入濾波器及開關輔助電路以避免開關元件（例如S1與S3)之同時導通造成電源短路。因此，本發明即針對上述有關諸缺點，再進一步加以改善，而硏發出本發明裝置。 (發明槪述）本發明之主要目的，係提供一種三相交流變直流轉換器裝置，以改善現有之三相交流變直流轉換器之缺點，並藉由一種控制簡單而實用化之電路裝置，以供給穩定且可以升/降壓之直流電壓，而同時達到具高效率、單位功率因數及三相輸入電流均爲弦波並且各半導體功率元件可充份利用之效果。首先，利用平衡三相電壓彼此相移120度之特性可將平衡三相電壓一週期依各相電壓大小之最正或最負，分成六種不同之區間，再依各不同之區間之特性並配合一般習甩之正弦脈波調變（SPWM)技術，以控制反流器架構之六個開關元件之導通狀態。當反流器架構之三個臂的上或下臂開關元件之控制信號在同時導通期間，輸入端之能量經由三相全橋式反流器架構儲存於串接於三相全橋式反流器架構與輸入端間之三個電感器。同時儲存於電容器之能量經由壹濾波電感器釋能到濾波電容器及負載。而當反流器架構之三個臂的上或下臂開關元件之控制信號不同時導通期間，將儲存於三相電感器之能量，經由功率二極體釋能到電容器；同時儲存於濾波電感器之能量亦經由同一功率二極體釋能到濾波電容器及負載。其特徵係將三相電源經 (請先閲讀背面之注意事項再填寫本頁)A7 B7 Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs V. Invention Description (1) One of the main motivations for the application of this invention was one of the applicants. In view of the current state's vigorous promotion of the concept of intellectual property rights, and the domestic industry Due to the great oppression from abroad, in particular, some of the results of the doctoral students under their guidance are applied before they are published in international academic journals, which will help to establish localized technology, and at the same time, from the perspective of education This view allows students to understand the process of patent application, and by letting them share the results, they can also inspire their creativity and invention ability in the future, so that they can apply for the invention. The invention relates to a three-phase AC-to-DC converter, in particular to a three-phase step-up / step-down AC-to-DC converter that can obtain high efficiency by using a single-stage converter, especially having both phases of current Both are sine waves and are unit power factor. The three-phase AC-to-DC converter with unit power factor mentioned here is used in, for example, a DC motor driver, a DC-link type AC-to-AC converter, or a stage that requires a stable DC power supply. Generally used three-phase AC to DC converter, its power factor often changes greatly due to the difference in load and heavy harmonics. If it needs to have the function of step-up / step-down, it usually requires two-stage conversion. Devices are connected in series to achieve. That is, the first stage performs rectification and power factor correction first, and the second stage is another DC / DC converter (DC / DC CONVERTER) for the DC voltage with step-up / step-down function, so it is difficult to achieve high efficiency. . Figure 1 shows the single-phase three-phase step-down / boost AC-to-DC converter architecture commonly used in related literature. The waveforms of the input voltage of phase a and the input current without high-frequency filter are shown in Figure 2. Although this type of three-phase AC to DC converter also has a step-up / step-down function, because the input a-current works in discontinuous mode, each component must have a higher rated voltage and current peak stress. Paper size is applicable to Chinese National Standard (CNS) A4 (210X297mm) J --------- \ installation— (please read the precautions on the back before filling this page). Central Bureau of Standards, Ministry of Economic Affairs A7 B7 printed by Beigong Cooperative Co., Ltd. 5. Description of the invention (2) As a result, the effective utilization of each component is low and serious electromagnetic interference. Harmonic pollution and low power factor. In addition, additional high-frequency input filters and auxiliary switching circuits are required to avoid the short circuit of the power supply when the switching elements (such as S1 and S3) are turned on simultaneously. Therefore, the present invention addresses the above-mentioned disadvantages and further improves it, thereby developing the device of the present invention. (Explanation of the invention) The main object of the present invention is to provide a three-phase AC-to-DC converter device to improve the shortcomings of the existing three-phase AC-to-DC converter, and by a simple and practical circuit device, In order to supply a stable and step-up / step-down DC voltage, and at the same time achieve the effect of high efficiency, unit power factor and three-phase input current are sine waves, and the semiconductor power components can be fully utilized. First, by using the characteristic that the balanced three-phase voltages are phase-shifted by 120 degrees with each other, one cycle of the balanced three-phase voltages can be divided into six different intervals according to the most positive or negative of the voltage of each phase. Cooperate with the common sine pulse modulation (SPWM) technology to control the on-state of the six switching elements of the inverter architecture. When the control signals of the upper or lower arm switching elements of the three arms of the inverter architecture are turned on at the same time, the energy at the input end is stored in the three-phase full-bridge inverter through the three-phase full-bridge inverter architecture. Three inductors between the inductor architecture and the input. At the same time, the energy stored in the capacitor is discharged to the filter capacitor and the load through a filter inductor. And when the control signals of the upper or lower arm switching elements of the three arms of the inverter architecture are not on at the same time, the energy stored in the three-phase inductor is discharged to the capacitor through the power diode; at the same time stored in the filter inductor The energy of the device is also discharged to the filter capacitor and the load through the same power diode. Its characteristics are the three-phase power supply (please read the precautions on the back before filling this page)

經濟部中央標準局貝工消費合作社印製 A7 _B7_ 五、發明説明（3 ) 由壹三相全橋式反流器架構之六個半導體開關元件加以適當控制，使得三相電源之電流爲弦波且達到單位功率因數之效果，同時具有調升或調降直流輸出電壓之功能。又本發明之其它目的及優點，可參照下面附圖之詳細說明獲得瞭解。 (圖示說明）首先將各圖式之說明表示如下：圖一：目前相關文獻常見之單級三相降/升壓交流變直流:轉換器 (buckboost type)架構。圖二：圖一中a相之輸入電壓與未經高頻濾波器之輸入電流波形圖。圖三：表示本發明之示意系統方塊圖。圖四：表示本發明之詳細實體結構圖。圖五：表示本發明控制器之功能方塊圖。 < 圖六：表示三相輸入電壓波形示意圖。圖七：本發明裝置選用控制策略1(即控制信號G=l)且在圖六之區間 2(即控制信號Fa=l,Fb = 0，Fc = 〇)及控制信號Ca=l， Cb = 0，Cc = 0時，半導體開關元件SI、S4及S6導通； 5 本紙張尺度適用中國國家標準（CNS ) A4規格（21〇'乂297公釐） 1.1... ^-----裝-------訂---.-----線 (請先閲讀背面之注意事項再填寫本頁) 經濟部中央標準局貝工消費合作社印裝 A7 _ B7___；_ 五、發明説明（4 ) S2、S3、及S5截斷，此時本發明裝置之電路之等效電路。圖八：本發明裝置選用控制策略1(即控制信號G=l)且在圖六之區間 2(即控制信號Fa=l ,Fb = 0，Fc = 0)及控制信號Ca=l， Cb = 〇,Cc=l時，半導體開關元件SI、S4與S5導通； S2、S3及S6截斷，此時牢發明裝置之電路之等效電路。圖九：本發明裝置選用控制策略U即控制信號G=1)且在圖六:之區間 2(即控制信號Fa=l,Fb = 0，Fc = 0)及控制信號Ca=l， Cb=l，Cc = 0,時，半導體開關元件S1、S3與S6導通； S2、S4及S5截斷，此時本發明裝置之電路之等效電路。圖十：本發明裝置選用控制策略1(即控制信號G=l)且在圖六之區間 2(即控制槍號Fa=l，Fb = 0，Fc = 0)及控制信號 Ca=l,Cb=l,Cc=l時，半導體開關元件S1、S3與S5 導通；S2、S4及S6截斷，此時本發明裝置之電路之等 .效電路。圖十一：本發明裝置選用控制策略1(即控制信號G=l)且在圖六之區間2(即控制信號Fa=l，Fb = 0,Fc = 0)及控制信號 C a = 0, C b = 1 (或 C b = 0), Γ c = 1 (或 C c = 0)時，半導體開關元件SI、S2、S3、S4、S5與S6導通，此時本發明 _6_ 本纸張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -------^-----------訂--------一線 (請先閲讀背面之注意事項再填寫本頁) B7 五、發明説明（5 ) 裝置之電路之等效電路。圖十二：本發明裝置之三相電流實測波形圖。圖十三：本發明裝置之a相電壓與電流實測波形圖。上述各圖中’各方塊圖編號表不如下. 11 :表示壹三相高頻L C濾波器。 12,74 :表示三相全橋式反流器之架構。 13,71,72,73,77 :表示電感器。 14,76 :功率二極體。 15,78 :表示濾波電容器。 16,79 :表示負載。 75 :表示電容器。經濟部中央標準局員工消費合作社印製 (請先閱讀背面之注意事項再填寫本頁) (發明之詳細說明）本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐）經濟部中央標準局貝工消費合作社印裝 A7 _B7__ 五、發明説明（6 ) 首先，敬請參閱圖三即本發明之示意系統方塊圖。由圖三知，輸入之三相交流電源（212)其能量經一受控之三相交直流轉換器（211)而轉移至直流電壓Vo輸出端（79 a, 79b)。一負載（79)並聯接於輸出端（79a，79b)以獲取所需之能量。本發明另含一轉換器控制電路（213)，其詳細功能方塊圖如圖五所示。至於本發明之工作原理可由下述之說明瞭解之。第三圖中轉換器之控制電路（213)之詳細說明如圖五所示。圖五中之加法器（26)之反相輸入端爲表示轉換器輸出電壓匕大小的信號，而加法器之非反向輸入端則爲輸出電壓之參考信號F。,#。加法器（26)產生電壓誤差信號&經由一輸出電壓調整器（30)(例如PI 控制器）來控制輸出電壓於設定値。電壓誤差爲正或爲負決定轉換器工作於整流或功率回送模式。控制信號與電壓偵測器（36)所偵測到的三相單位相電壓V%，，vOT分別送進乘法器（27)、（28) 與（29)中計算出轉換器所需之三相參考電流命令 <，<，（之後，再分別送到加法器（23)、（24)與（25)之非反相輸入端。同時，加法器（23)、（24)與（25)之反向輸入端分別接受三相實際電流信號 L44，然後加法器（23)、（24)與（25)分別產生電流誤差信號心’ ~，心分別送入電流調整器（30)、（3 1)與（32)(例如PI控制器），電流調整器（30)、（31)與（32)之輸出信號再與高頻三角波產生器（50)所產生的高頻三角波分別經比較器（51)、（52)與（53)相互比較產生控制信號Ca, Cb與Cc後，再分別送入一驅動信號選擇器（33)之輸入端3d:3e，3f。同時，電壓偵測器（36)所偵測到的三相相電壓va„，，ve„分別送進三相零點檢測電路（60)後獲得輸 8_ 本纸張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） I— I II與訂 „ 線 (請先閲讀背面之注意事項再填寫本頁) A7 B7 五、發明説明（7 ) 出入信號Fa、Fb與Fc，亦分別送入驅動信號選擇控制器（33)之輸入端3a,3b，3c。同時控制策略選擇器（44)之輸出信號令（G)亦送入驅動信號選擇控制器（3 3)之輸入端3 g，驅動信號選擇控制器 (33)則依控制信號G之狀態經驅動信號選擇器 (3 3)決定六個功率半導體開關元件（81，32,83,84,35,86)之驅動信號後，再分別送入一般習用之三相功率半導體開關驅動器（34) 以控制六個功率半導體開關元件（3 1，32,83,84,85,86)的開/關動作，如此完成整個轉換器的運作。由上面的敘述可以看出整個工作原理並不複雜，實體製作相當容易。本發明裝置所採用之可調式三相升/降壓交/直流轉換器主電路如第四圖所示。其中各半導體開關元件之觸發電路，是用壹習用之脈寬調變電路，因此具有控制簡單與固定切換頻率之優點。至於三相全橋式反流器架構之六個半導體開關元件之切換決定乃在於利用平衡三相電壓彼此相移120度之特性可將平衡三相電壓一週期依各相電壓大小之最正或最負，分成如圖六.所示之六種不同之區間，再依各不同之區間之特性及實際回授電流誤差量而決定之。 (請先閲讀背面之注意事項再填寫本莨) ,-rr 經濟部中央標準局貝工消費合作社印裝爲了更進一步說明本發明之操作原理，首先將上述圖五之控制信號Ca,Cb,Cc，Fa，Fb，Fc與G表示如下： 9 本紙張尺度適用中國_家標準（CNS ) A4規格（21〇X29<7公釐） Α7 Β7 五'發明説明（8)Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperative A7 _B7_ V. Description of the invention (3) Six semiconductor switching elements of a three-phase full-bridge inverter architecture are appropriately controlled so that the current of the three-phase power supply is a sine wave And achieve the effect of the unit power factor, at the same time have the function of raising or lowering the DC output voltage. Other objects and advantages of the present invention can be understood with reference to the following detailed description of the accompanying drawings. (Illustration) First, the description of each figure is shown as follows: Figure 1: Single-phase three-phase buck / boost AC to DC: converter (buckboost type) architecture commonly used in related literature. Figure 2: Waveform of input voltage a and input current without high-frequency filter in phase 1. Figure 3: A block diagram showing a schematic system of the present invention. Figure 4: A detailed physical structure diagram of the present invention. Figure 5: A functional block diagram of the controller of the present invention. < Figure 6: Schematic diagram showing the three-phase input voltage waveform. Figure 7: The device of the present invention selects control strategy 1 (ie, control signal G = 1) and is in interval 2 (ie, control signals Fa = 1, Fb = 0, Fc = 0) and control signals Ca = l, Cb = When 0, Cc = 0, the semiconductor switching elements SI, S4, and S6 are turned on; 5 This paper size applies the Chinese National Standard (CNS) A4 specification (21〇 '乂 297 mm) 1.1 ... ^ ----- install ------- Order ---.----- line (please read the precautions on the back before filling this page) Printed by the Central Standards Bureau of the Ministry of Economy, Shellfish Consumer Cooperative, A7 _ B7___; _ V. Invention Explanation (4) S2, S3, and S5 are truncated. At this time, the equivalent circuit of the circuit of the device of the present invention. Figure 8: The device of the present invention selects control strategy 1 (ie, control signal G = 1) and is in interval 2 (ie, control signals Fa = 1, Fb = 0, Fc = 0) and control signals Ca = l, Cb = 〇, Cc = 1, the semiconductor switching elements SI, S4 and S5 are turned on; S2, S3 and S6 are cut off, and the equivalent circuit of the circuit of the device is invented at this time. Figure 9: The device of the present invention selects the control strategy U, that is, the control signal G = 1) and is in the interval 2 of Figure 6: (that is, the control signals Fa = 1, Fb = 0, Fc = 0) and the control signals Ca = 1, Cb = l, when Cc = 0, the semiconductor switching elements S1, S3, and S6 are turned on; S2, S4, and S5 are turned off, and the equivalent circuit of the circuit of the device of the present invention at this time. Figure 10: The device of the present invention selects control strategy 1 (that is, the control signal G = 1) and is in the interval 2 of FIG. 6 (that is, the control gun number Fa = 1, Fb = 0, Fc = 0) and the control signals Ca = 1, Cb When = 1, Cc = l, the semiconductor switching elements S1, S3, and S5 are turned on; S2, S4, and S6 are turned off, and the equivalent circuit of the circuit of the device of the present invention at this time. Figure 11: The device of the present invention selects control strategy 1 (ie, control signal G = 1) and is in interval 2 (ie, control signals Fa = 1, Fb = 0, Fc = 0) and control signals C a = 0, When C b = 1 (or C b = 0) and Γ c = 1 (or C c = 0), the semiconductor switching elements SI, S2, S3, S4, S5, and S6 are turned on. At this time, the present invention_6_ This paper The scale is applicable to China National Standard (CNS) A4 specification (210X297 mm) ------- ^ ----------- Order -------- line (please read the first Note this page, please fill out this page) B7 V. Description of the invention (5) Equivalent circuit of the device circuit. Fig. 12: Three-phase current measurement waveform diagram of the device of the present invention. Fig. 13: Measured waveforms of phase a voltage and current of the device of the present invention. The numbers of the block diagrams in the above figures are not as follows. 11: Represents a three-phase high-frequency LC filter. 12,74: Represents the architecture of a three-phase full-bridge inverter. 13,71,72,73,77: Indicates inductors. 14,76: power diode. 15,78: Represents a filter capacitor. 16,79: indicates the load. 75: indicates a capacitor. Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the notes on the back before filling out this page) (Detailed description of the invention) This paper size applies the Chinese National Standard (CNS) A4 (210X297 mm) Central Standard of the Ministry of Economics A7__B7__ printed by the local shellfish consumer cooperative V. Description of the invention (6) First, please refer to FIG. 3 which is a schematic system block diagram of the present invention. As shown in Figure 3, the energy of the input three-phase AC power supply (212) is transferred to the DC voltage Vo output terminals (79a, 79b) through a controlled three-phase AC-DC converter (211). A load (79) is connected in parallel to the output terminals (79a, 79b) to obtain the required energy. The present invention further includes a converter control circuit (213), and its detailed functional block diagram is shown in Figure 5. The working principle of the present invention can be understood from the following description. The detailed description of the converter control circuit (213) in the third figure is shown in Figure 5. The inverting input terminal of the adder (26) in Fig. 5 is a signal indicating the size of the converter output voltage, and the non-inverting input terminal of the adder is the reference signal F of the output voltage. , #. The adder (26) generates a voltage error signal & controls an output voltage to a set value through an output voltage regulator (30) (e.g., a PI controller). Whether the voltage error is positive or negative determines that the converter works in rectification or power return mode. The control signal and the three-phase unit phase voltage V% detected by the voltage detector (36), and vOT are sent to the multipliers (27), (28), and (29), respectively. The phase reference current commands <, <, (after that, they are sent to the non-inverting input terminals of the adders (23), (24) and (25) respectively. At the same time, the adders (23), (24) and ( The reverse input terminals of 25) respectively receive the three-phase actual current signals L44, and then the adders (23), (24), and (25) generate the current error signal cores, respectively, and the cores are sent to the current regulators (30), (3 1) and (32) (for example, PI controller), the output signals of the current regulators (30), (31), and (32) are passed through the high-frequency triangle wave generated by the high-frequency triangle wave generator (50) respectively. The comparators (51), (52), and (53) compare and generate control signals Ca, Cb, and Cc, and then send them to the input terminals 3d: 3e, 3f of a drive signal selector (33). At the same time, the voltage detection The three-phase phase voltages va „, ve„ detected by the tester (36) are sent to the three-phase zero-point detection circuit (60), and the output is 8_ This paper size is applicable to the Chinese national standard (CNS) A4 specification (210X297mm) I—I II and order line (please read the notes on the back before filling this page) A7 B7 V. Description of the invention (7) The access signals Fa, Fb and Fc, also separately Send to the input terminals 3a, 3b, 3c of the drive signal selection controller (33). At the same time, the output signal command (G) of the control strategy selector (44) is also sent to the input terminal 3 of the drive signal selection controller (3 3) g. The driving signal selection controller (33) determines the driving signals of the six power semiconductor switching elements (81, 32, 83, 84, 35, 86) via the driving signal selector (3 3) according to the state of the control signal G. , And then send them into the conventional three-phase power semiconductor switch driver (34) to control the on / off action of six power semiconductor switching elements (31, 32, 83, 84, 85, 86), thus completing the entire converter It can be seen from the above description that the entire working principle is not complicated, and the physical production is quite easy. The main circuit of the adjustable three-phase step-up / step-down AC / DC converter used in the device of the present invention is shown in the fourth figure. The trigger circuit of each semiconductor switching element is a conventional one. The wide modulation circuit has the advantages of simple control and fixed switching frequency. As for the switching decision of the six semiconductor switching elements of the three-phase full-bridge inverter architecture, the balanced three-phase voltage is shifted by 120 degrees from each other. One cycle of the balanced three-phase voltage can be divided into six different intervals as shown in Figure 6 according to the most positive or negative voltage of each phase, and then according to the characteristics of the different intervals and the actual feedback current error. (Please read the notes on the back before filling in this note), -rr Printed by the Shellfish Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. Cb, Cc, Fa, Fb, Fc and G are expressed as follows: 9 This paper size is applicable to China Standard (CNS) A4 specification (21 × 29 < 7 mm) Α7 Β7 Five 'invention description (8)

Ca if (0-^(0Ca if (0-^ (0

CbCb

Cc |〇 ifVtrig^t)>ic if Vojg(t)<Jc\t)-icU) 0 ifVan{t)<〇 ----------产—— (請先閲讀背面之注意事項再填寫本頁)Cc | 〇ifVtrig ^ t) > ic if Vojg (t) < Jc \ t) -icU) 0 ifVan (t) < 〇 ---------- Product—— (Please read the back first (Notes for filling in this page)

FbFb

rl i/Vin(0>〇〇 ifVbn{t)<Q (5) 訂rl i / Vin (0 > 〇〇 ifVbn (t) < Q (5) order

Fc Ί i/Vcn(t)>〇〇 ifKA〇<〇 (6) 線Fc Ί i / Vcn (t) > 〇〇 ifKA〇 < 〇 (6) line

G fl選用控制策略1 0選用控制策略2 (7) 經濟部中央標準局貝工消費合作社印製然後，考慮選用控制策略1(G=1)且在圖六之區間2B#，本發明裝置之電路工作狀態。觀察圖六知三相輸入電源在區間2時，Ka(〇爲正値且K⑴與K⑴爲負値。因此，吾等可知此時控制信號Fa= 1, Fb = 0，Fc = 0。再考慮控制信號Ca,Cb，Cc之狀態，吾等可以決定 10 本纸張尺度適用中國國家標準（CNS ) Α4規格（210X 297公釐）經濟部中央標準局貝工消費合作社印製 A7 B7 五、發明説明（9 ) 三相全橋式反流器架構之六個半導體開關元件之導通或截斷。因此，吾等可得下列五種工作模式：模式1-1 :本發明裝置選用控制策略1(即控制信號G=l)且在圖六之區間2(即控制信號Fa=l，Fb = 0，Fc = 0)及控制信號 Ca=l，Cb = 0，Cc = 0時，半導體開關元件S 1、S4及 S6導通：S2、S3及S5.截斷，此時本發明裝置之電路之等效電路。（如圖七所示）模式1-2 :本發明裝置選用控制策略1(即控制信號G=l)且在圖六之區間2(即控制信號Fa=l,Fb = 0，Fc = 0)及控制信號 Ca=l，Cb = 0，Cc=l時，半導體開關元件SI、S4與 S5導通；S2 ' S3及S6截斷，此時本發明裝置之電路之等效電路。（如圖八所示）模式1-3 :本發明裝置選用控制策略1(即控制信號.G=l)且在圖六之區間2(即'控制信號Fa=l，Fb = 0，Fc = 0)及控制信號 Ca=l，Cb=l，Cc = 0,時，半導體開關元件S1 、以與 S6導通；S2、S4及S5截斷，此時本發明裝置之電路之等效電路。（如圖九所示）模式1-4 :本發明裝置選用控制策略1(即控制信號〇=1)且在圖六之區間2(即控制信號Fa=l,Fb = 〇，Fc = 〇)及控制信號 Ca=l，Cb=l，Cc=l時，半導體開關元件Si 、s3與 S5導通；S2、S4及S6截斷，此時本發明裝置之電路之等效電路。（如圖十所示） η__ 本紙張尺度適用中國國家標準（CNS ) Α4規格（210Χ297公釐）； n 裝 1 訂 7 線 (請先閲讀背面之注意事項再填寫本頁) A7 B7 經濟部中央標準局貝工消费合作社印製五、發明説明（i〇) 模式1-5 :本發明裝置選用控制策略1(即控制信號G=l)且在圖六之區間2(即控制信號Fa=l，Fb = 0,Fc = 0)及控制信號 Ca = 0，Cb=.l(或 Cb = 0)，Cc=l(或 Cc = 0)時，半導體開關元件SI、S2、S3、S4、S5與S6導通，此時本發明裝置之電路之等效電路。（如圖i一所示）因第六圖之區間1、3、4、5和6之工作模式與區間2相類似，且原理幾乎完全一致，甚易明瞭，故不再對各區間之工作模式再一-—賛述。接著，考慮選用控制策略2(G = 0)且在圖七之區間2時，本發明裝置之電路工作狀態。同理吾人可知此時控制信號Fa=l,Fb = 0, Fc = 〇。再考慮控制信號Ca，Cb，Cc之狀態，吾等可以決定三相全橋式反流器架構之六個半導體開關元件之導通或截斷。因此，吾等可得下列四種工作模式：模式2-1 :本發明裝置選用控制策略1(即控制信號G=0)且在圖六之區間2(即控制信號Fa=l，Fb = 0，Fc = 0)及控制信號 Ca=l，Cb = 0，Cc = 0時，半導體開關元件S 1、S4及 S6導通；S2、S3及S5截斷，此時本發明裝置之電‘ 路之等效電路。（如圖七所示）模式2-2 :本發明裝置選用控制策略1(即控制信號G=0)且在圖六之區間2(即控制信號Fa=l,Fb = 0，Fc = 0)及控制信號 Ca=l，Cb = 0，Cc=l時，半導體開關元件SI、S4與 ___12 本纸張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） i n n n ϋ n i— an > n n· n d m T m κ. I I n--- 券、\§. - 崩 {請先閲讀背面之注意事項再填寫本頁} 經濟部中央標準局貝工消費合作社印製 A7 B7 五、發明説明（ li) S5導通；S2、S3及S6截斷，此時本發明裝置之電路之等效電路。（如圖八所示）模式2_3 :本發明裝置選用控制策略1(即控制信號G=0)且在圖六之區間2(即控制信號Fa=l,Fb = 0,Fc = 0)及控制信號 Ca=l，Cb=l，Cc = 0,時，半導體開·關元件S1、S3與 S6導通；S2、S4及S5截斷，此時本發明裝置之電路之等效電路。（如圖九所示）模式2-4 :本發明裝置選用控制策略1(即控制信號G=0)且在:圖六之區間2(即控制信號Fa=l，Fb = 0，Fc = 0)及控制信號G fl selects control strategy 1 0 selects control strategy 2 (7) Printed by the Shellfish Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs and then considers the selection of control strategy 1 (G = 1) and the interval 2B # in FIG. Circuit working status. Observing Figure 6 shows that when the three-phase input power is in interval 2, Ka (0 is positive 値 and K ⑴ and K ⑴ are negative 因此. Therefore, we can know that the control signals Fa = 1, Fb = 0, and Fc = 0. Consider again The status of the control signals Ca, Cb, Cc, we can determine 10 paper sizes applicable to the Chinese National Standard (CNS) A4 specifications (210X 297 mm) Printed by the Bayer Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 V. Invention Explanation (9) The six semiconductor switching elements of the three-phase full-bridge inverter architecture are turned on or off. Therefore, we can obtain the following five working modes: Mode 1-1: The control strategy of the device of the present invention is 1 (ie When the control signal G = 1 and the interval 2 in FIG. 6 (that is, the control signals Fa = 1, Fb = 0, Fc = 0) and the control signals Ca = 1, Cb = 0, and Cc = 0, the semiconductor switching element S1 , S4, and S6 are on: S2, S3, and S5 are cut off. At this time, the equivalent circuit of the device of the present invention. (Shown in Figure 7) Mode 1-2: The device of the present invention selects control strategy 1 (ie, control signal G) = l) and in the interval 2 in FIG. 6 (that is, the control signals Fa = 1, Fb = 0, Fc = 0) and the control signals Ca = 1, Cb = 0, and Cc = 1, the semiconductor switches on. The components SI, S4 and S5 are turned on; S2 'S3 and S6 are cut off. At this time, the equivalent circuit of the device of the present invention. (Shown in Figure 8) Mode 1-3: The device of the present invention selects control strategy 1 (ie, control signal) .G = l) and in the interval 2 of FIG. 6 (that is, 'control signal Fa = 1, Fb = 0, Fc = 0) and control signal Ca = 1, Cb = 1, Cc = 0, the semiconductor switching element S1 , To be connected to S6; S2, S4, and S5 are cut off, at this time the equivalent circuit of the device of the present invention. (Shown in Figure 9) Mode 1-4: The device of the present invention selects control strategy 1 (that is, the control signal 0 = 1) When interval 2 in FIG. 6 (that is, control signals Fa = 1, Fb = 〇, Fc = 〇) and control signals Ca = 1, Cb = 1, and Cc = 1, the semiconductor switching elements Si, s3, and S5 are turned on. ; S2, S4 and S6 are cut off. At this time, the equivalent circuit of the circuit of the device of the present invention. (As shown in Fig. 10) η__ This paper size applies the Chinese National Standard (CNS) A4 specification (210 × 297 mm); Line 7 (Please read the notes on the back before filling out this page) A7 B7 Printed by the Shellfish Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the invention (i〇) Mode 1-5: The invention Set control strategy 1 (ie control signal G = 1) and select interval 2 (ie control signals Fa = 1, Fb = 0, Fc = 0) and control signals Ca = 0, Cb = .l (or Cb = 0), Cc = 1 (or Cc = 0), the semiconductor switching elements SI, S2, S3, S4, S5 and S6 are turned on. At this time, the equivalent circuit of the circuit of the device of the present invention. (As shown in Figure i) Because the working modes of interval 1, 3, 4, 5, and 6 in the sixth diagram are similar to interval 2, and the principle is almost the same, it is easy to understand, so the work of each interval is no longer Another pattern-praise. Next, consider the use of control strategy 2 (G = 0) and the state of the circuit of the device of the present invention when interval 2 in Fig. 7 is selected. In the same way, we can know that the control signals Fa = 1, Fb = 0, and Fc = 0. Considering the states of the control signals Ca, Cb, and Cc, we can determine whether the six semiconductor switching elements of the three-phase full-bridge inverter architecture are turned on or off. Therefore, we can obtain the following four working modes: Mode 2-1: The device of the present invention selects control strategy 1 (that is, the control signal G = 0) and is in the interval 2 of FIG. 6 (that is, the control signals Fa = 1 and Fb = 0. , Fc = 0) and control signals Ca = 1, Cb = 0, Cc = 0, the semiconductor switching elements S1, S4, and S6 are turned on; S2, S3, and S5 are cut off, at this time, the electric circuit of the device of the present invention is equivalent to Effective circuit. (As shown in Figure 7) Mode 2-2: The device of the present invention selects control strategy 1 (that is, the control signal G = 0) and is in interval 2 in FIG. 6 (that is, the control signals Fa = 1, Fb = 0, and Fc = 0) And control signals Ca = 1, Cb = 0, Cc = 1, the semiconductor switching elements SI, S4, and ___12 This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X 297 mm) innn ϋ ni — an > nn · ndm T m κ. II n --- coupons, \ §.-collapse {Please read the notes on the back before filling out this page} A7 B7 printed by the Shellfish Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 5. Description of the invention (Li) S5 is on; S2, S3, and S6 are cut off. At this time, the equivalent circuit of the circuit of the device of the present invention. (As shown in Figure 8) Mode 2_3: The device of the present invention selects control strategy 1 (that is, control signal G = 0) and is in interval 2 (that is, control signals Fa = 1, Fb = 0, Fc = 0) and control When the signals Ca = 1, Cb = 1, and Cc = 0, the semiconductor switching elements S1, S3, and S6 are turned on; S2, S4, and S5 are cut off. At this time, the equivalent circuit of the circuit of the device of the present invention. (As shown in Figure 9) Mode 2-4: The device of the present invention selects control strategy 1 (that is, the control signal G = 0) and is in: interval 2 in FIG. 6 (that is, the control signals Fa = 1, Fb = 0, and Fc = 0 ) And control signals

Ca=l，Cb=l，Cc=l (或（Ca=0，Cb=0,Cc=0);或 (Ca = 0,Cb = 0,Cc = l)；或(Ca = 0,Cb= 1 ,Cc = 0)； (Ca = 0，Cb=l，Cc=l))時，半導體開關元件SI 、 S2、S3、S4、S5與S6導通，此時本發明裝置之電路之等效電路。（如圖十一所示） • . · 因第六圖之區間1、3、4、5和6之工作模式與區間2相類似，且原理幾乎完全一致，甚易明瞭，故不再對各區間之工作模式再--賛述。本發明裝置之三相輸入電流由實作電路所測得之波形圖與a.‘ 相輸入電壓及電流實測波形圖分別如圖十二與圖十三所示。由圖十二至十三之結果，甚易瞭解本發明裝置除具單級轉換之功能外，並可獲得單位功因及乾淨弦波之三相輸入電流。至於本發 13__ 本紙張尺度適用中國國家標準（CNS )人4規^ 210 X 297公釐） M. -------IT--^-----.^- (請先閲讀背面之注意事項再填寫本頁)Ca = l, Cb = l, Cc = l (or (Ca = 0, Cb = 0, Cc = 0); or (Ca = 0, Cb = 0, Cc = l); or (Ca = 0, Cb = (1, Cc = 0); (Ca = 0, Cb = 1, Cc = 1)), the semiconductor switching elements SI, S2, S3, S4, S5, and S6 are turned on, and the equivalent circuit of the circuit of the device of the present invention at this time . (As shown in Figure 11) •. • Because the working modes of interval 1, 3, 4, 5, and 6 in the sixth diagram are similar to interval 2, and the principle is almost the same, it is easy to understand, so it is no longer The working mode of the interval again-praise. The waveform diagram of the three-phase input current of the device of the present invention measured by the implementation circuit and a. ‘Phase input voltage and current measured waveform diagrams are shown in FIGS. 12 and 13 respectively. From the results of Figures 12 to 13, it is easy to understand that in addition to the single-stage conversion function, the device of the present invention can obtain a three-phase input current with a unit power factor and a clean sine wave. As for this issue 13__ This paper size applies to Chinese National Standards (CNS) Standard 4 ^ 210 X 297 mm) M. ------- IT-^ -----. ^-(Please read the back first (Notes for filling in this page)

141,142,143 144 145 146 147 14 8 1 4 Q A7 B7 五、發明説明（i2) 明裝置輸出直流電壓大小之調整，則是利用電壓回路之回授控制配合本發明裝置之可調式電路架構以達成。第十四圖所示係爲根據第四圖所示之本發明基本配置之第二實施例之架構圖。在第十四圖中，表示電感器。表示三相全橋式反流器架構。表示電容器。表示電感器。：功率二極體。表示濾波電容器。表示負載。比較第四圖及第十四圖，可見本發明之第一實施例及第二實施例最大之不同在於第四圖中之功率二極體（76)與電感器 (77)，於第十五圖中_，分別以壹電感器（146)與壹功率二極體 (147)取代之。因第十四圖與第四圖之工作模式相類似，且原理幾乎完全一致，甚易明瞭，故不再對各工作模式再一一贅述。第十五圖所示係爲本發明第三實施例（即第四圖之隔離型架' 構），在第十五圖中， 1 5 1,1 5 2,1 5 3 :表示電感器。 ‘ 154 :表示三相全橋式反流器架構。 ____14 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） ---------^------、訂---------^ (請先閲讀背面之注意事項再填寫本頁) 經濟部中央標準局貝工消費合作社印製五、發明説明（l3 ) A7 B7 經濟部中央樣準局貝工消費合作社印製 155,157 :表示電容器。 15 6 :表示高頻變壓器。 15 8 :功率二極體。 1 59 :表示電感器。 170 :表示濾波電容器。 17 1 :表示負載。· 比較第十五圖及第四圖，可知於第十五圖中僅將第四圖中後半部之直流變直流轉換器（即C’uk converter)部份以其習用之隔離型取代之。二因第十五圖與第四圖之工作原理幾乎完全相同，故不再對各工作模式再——贅述。第十六圖所示係爲本發明第四實施例（即第十四圖之隔離型架構），在第十六圖中_， . 16 1,162,163 表示電感器。 164 表示三相全橋式反流器架構。 1 65 表示電容器。 ‘ 1 66 表示高頻變壓器。 1 67 功率二極體。 16 8 表示瀘波電容器。 1 69 :表示負載。 15 私紙張尺度適用中國國家標準（CNS ) A4規格（21〇><297公產） -----------,4J------iT—lll··--^1)1 (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（14 ) 比較第十六圖及第十四圖，可知於第十六圖中僅將第十四圖之電感器（146)以高頻變壓器（166)取代之，以達電源與負載隔離之效果。因第十六圖與第十四圖之工作原理幾乎完全一致，亦甚易明瞭，故不再對各工作模式一一贅述。如是，本發明具有以下之特點： (1) 本發明僅由單級轉換器即可達成所需功能，故甚易獲得高效率。 (2) 輸入之三相交流電源各相電壓及電流均爲弦波且同相，故可達到單位功率因數且無諧波污染之高性能。 (3) 輸入之三相交流各相電流工作於連續模式，因此各開關元件之電流應力小，可降俾設備成本，甚適合大功率之應用。 (4) 此轉換器其輸出之直流電壓具有升/降壓之功能。 (5) 此轉換器具有固定切換頻率，故濾波器設計容易。上述各點，在在顯示本發明確能達到預期之目的、功效，且申請前從未見諸於國內外任何刊物或公開使用，符合發明專利申請。 16 本紙張尺度適用中國國家標準（CNS )人4規格（210X 297公釐） (請先閲讀背面之注意事項再填寫本頁) 訂 -綉141,142,143 144 145 146 147 14 8 1 4 Q A7 B7 V. Description of the invention (i2) The adjustment of the output DC voltage of the device is achieved by using the feedback control of the voltage loop and the adjustable circuit architecture of the device of the invention. The fourteenth figure is a structural diagram of a second embodiment according to the basic configuration of the present invention shown in the fourth figure. In the fourteenth figure, an inductor is shown. Represents a three-phase full-bridge inverter architecture. Represents a capacitor. Represents an inductor. : Power Diode. Represents a filter capacitor. Represents the load. Comparing the fourth diagram and the fourteenth diagram, it can be seen that the biggest difference between the first embodiment and the second embodiment of the present invention lies in the power diode (76) and the inductor (77) in the fourth diagram. In the figure, _ is replaced by an inductor (146) and a power diode (147), respectively. Since the working modes of the fourteenth diagram are similar to that of the fourth diagram, and the principle is almost the same, it is easy to understand, so I will not repeat the details of each mode. The fifteenth figure shows a third embodiment of the present invention (the isolated structure of the fourth figure). In the fifteenth figure, 1 5 1, 1 5 2, 1 5 3: represents an inductor. ‘154: Represents a three-phase full-bridge inverter architecture. ____14 This paper size is applicable to China National Standard (CNS) A4 specification (210X297 mm) --------- ^ ------, order --------- ^ (Please read first Note on the back, please fill in this page again.) Printed by the Shellfish Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. 5. Description of the invention (l3) A7 B7. 15 6: indicates a high-frequency transformer. 15 8: Power diode. 1 59: indicates an inductor. 170: indicates a filter capacitor. 17 1: indicates load. · Comparing the fifteenth figure and the fourth figure, it can be seen that in the fifteenth figure, only the DC-to-DC converter (ie, C'uk converter) in the second half of the fourth figure is replaced with its conventional isolation type. 2. As the working principle of the fifteenth figure is almost the same as that of the fourth figure, it will not be repeated for each working mode. The sixteenth figure shows the fourth embodiment of the present invention (that is, the isolated structure of the fourteenth figure). In the sixteenth figure, _,. 16 1,162,163 represent inductors. 164 indicates a three-phase full-bridge inverter architecture. 1 65 indicates a capacitor. ‘1 66 represents a high-frequency transformer. 1 67 Power diode. 16 8 represents a chirped wave capacitor. 1 69: indicates the load. 15 Private paper standards are applicable to China National Standard (CNS) A4 specifications (21〇 < 297 public products) -----------, 4J ------ iT—lll · ·-^ 1) 1 (Please read the notes on the back before filling out this page) A7 B7 printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the invention (14) Comparing the sixteenth and fourteenth pictures, you can see in the tenth In the sixth figure, only the inductor (146) of the fourteenth figure is replaced by a high-frequency transformer (166) to achieve the effect of power supply and load isolation. Since the working principles of Figure 16 and Figure 14 are almost the same, and it is easy to understand, the detailed description of each working mode will not be repeated. If so, the present invention has the following characteristics: (1) The present invention can achieve the required function only by a single-stage converter, so it is easy to obtain high efficiency. (2) The voltage and current of each phase of the input three-phase AC power supply are sine waves and in phase, so it can achieve high performance with unit power factor and no harmonic pollution. (3) The input three-phase AC current of each phase works in continuous mode, so the current stress of each switching element is small, which can reduce equipment cost and is suitable for high-power applications. (4) The output DC voltage of this converter has the function of stepping up / down. (5) This converter has a fixed switching frequency, so the filter design is easy. The above-mentioned points, before showing that the present invention can indeed achieve the intended purpose and efficacy, have never been seen in any domestic or foreign publications or publicly used before application, and are in line with the invention patent application. 16 This paper size is applicable to China National Standard (CNS) Person 4 specifications (210X 297 mm) (Please read the precautions on the back before filling this page) Order-Embroidery

Claims

A8 B8 C8 D8六、申請專利範園經濟部中央標隼局貝工消費合作社印製 1 · 一種可調式三相升/降壓交流變直流轉換器，其特徵爲串接三個電感器於電源與習用之三相全橋式反流器架構之輸入端’而於該三相全橋式反.流器架構之輸出端並聯一個由電容器及一個功率二極體所組成之串聯電路後，再於功率二極體之兩端再並聯一個由濾波電感器及一個濾波電容器所組成之串聯電路，而_負載電阻則並接於此濾波電容器。 2 ·依申請專利範圍第一項所述之可調式三相升/降壓交流變直流轉換器，其中，將功率二極體與濾波電感器依序分別以壹濾波電感器與壹功率二極體取代，而形成另一型式可調式三相升/降壓交流變直流轉換器。 3 ·依申請專利範圍第一項所述之可調式三相升/降壓交流變直流轉換器，其中，將左側電路含三相電感器、反流器及所串聯電容器部份與後面並聯二極體部份之右側電路分開成二個電路，然後將左側電路串接（cascade)—高頻變壓器之一次側，而將高頻變壓器二次側先串聯另一電容器後再並接於前述已分離之右側電路部份，以形成另一種隔離型之可調式三相升/降壓交流變直流轉換器。 4 ·依申請專利範圍第三項所述之可調式三相升/降壓交流變直流轉換器，其中，將高頻變壓器之二次側繞組以多繞組取代，並於各二次側繞組之輸出端加入與原單一繞組相同之二 (請先閱讀背面之注意事項再填寫本頁) 裝. ,ιτ PJ·: 17 紙張尺度逋用中國國家標準（CNS ) A4規格（210X297公釐） A8 B8 C8 D8 六、申請專利範圍次側電路架構，而形成另一種隔離型多輸出之可調式三相升 /降壓交流變直流轉換器。 5 ·依申請專利範圍第二項所述之可調式三相升/降壓交流變直流轉換器，其中，將濾波電感器以壹高頻變壓器取代，以達電源與負載隔離之效果，而形成另一型式之可調式三相升/ 降壓交流變直流轉換器。 6 ·依申請專利範圍第五項所述之可調式三相升/降壓交流變直流轉換器，其中，將高頻變壓器之二次側繞組以多繞組取代，並於各二次側繞組之輸出端加入原單一繞組相同之二次側電路架構，而形成另一種隔離型多輸出之可調式三相升/ 降壓交流變直流轉換器。 7·依申請專利範圍第一項至六項所述之可調式三相升/降壓交流變直流轉換器，其中，將三相全橋式反流器架構以壹具柔性切換（soft switching)之三相全橋式反流器架構取代，而形成另六種可調式三相升/降壓交流變直流轉換器。 I---^-----f--- (請先閲讀背面之注意事項再填寫本頁) 訂經濟部中央標準局員工消費合作社印製本紙张尺度適用中國國家標準（CNS ) A4规格（210X297公釐）A8 B8 C8 D8 VI. Patent Application Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Printed by Shellfish Consumer Cooperatives1. An adjustable three-phase step-up / step-down AC-to-DC converter, characterized by three inductors connected in series to the power supply Connect a series circuit composed of a capacitor and a power diode in parallel with the input terminal of the conventional three-phase full-bridge inverter architecture and the output of the three-phase full-bridge inverter architecture in parallel. A series circuit composed of a filter inductor and a filter capacitor is connected in parallel at both ends of the power diode, and the load resistor is connected in parallel to the filter capacitor. 2 · The adjustable three-phase step-up / step-down AC-to-DC converter according to the first item of the scope of the patent application, wherein the power diode and the filter inductor are sequentially divided into a filter inductor and a power two pole, respectively. Instead, it forms another type of adjustable three-phase step-up / step-down AC-to-DC converter. 3 · According to the adjustable three-phase step-up / step-down AC-to-DC converter described in the first item of the scope of patent application, the left circuit contains three-phase inductors, inverters and capacitors connected in series with the rear two The right circuit of the polar part is divided into two circuits, and then the left circuit is cascaded-the primary side of the high-frequency transformer, and the secondary side of the high-frequency transformer is connected in series with another capacitor and then connected in parallel to the aforementioned The separated right circuit part forms another adjustable three-phase step-up / step-down AC-to-DC converter. 4 · The adjustable three-phase step-up / step-down AC-to-DC converter according to the third item of the scope of the patent application, wherein the secondary winding of the high-frequency transformer is replaced by a multi-winding, and The output end is added with the same two as the original single winding (please read the precautions on the back before filling this page).., Ιτ PJ ·: 17 Paper size: Chinese national standard (CNS) A4 specification (210X297 mm) A8 B8 C8 D8 VI. Patent application scope Secondary side circuit architecture, forming another isolated multi-output adjustable three-phase step-up / step-down AC-to-DC converter. 5 · According to the adjustable three-phase step-up / step-down AC-to-DC converter described in the second item of the patent application scope, wherein the filter inductor is replaced by a high-frequency transformer to achieve the effect of isolating the power source from the load. Another type of adjustable three-phase step-up / step-down AC-to-DC converter. 6. The adjustable three-phase step-up / step-down AC-to-DC converter according to item 5 of the scope of the patent application, wherein the secondary winding of the high-frequency transformer is replaced by a multi-winding and The output side is added with the same secondary circuit structure as the original single winding, and forms another isolated multi-output adjustable three-phase step-up / step-down AC-to-DC converter. 7. The adjustable three-phase step-up / step-down AC-to-DC converter according to the first to sixth items of the scope of the patent application, wherein the three-phase full-bridge inverter architecture is soft-switched. The three-phase full-bridge inverter architecture was replaced to form another six adjustable three-phase step-up / down AC-to-DC converters. I --- ^ ----- f --- (Please read the notes on the back before filling out this page) Order printed by the Central Consumers Bureau of the Ministry of Economic Affairs, Consumer Cooperatives This paper is sized for China National Standard (CNS) A4 (210X297 mm)