1273760 九、發明說明： 【發明所屬之技術領域】 一種具附加線圈之順向式轉換電路，尤指一種於變壓 态之次級鉍組連接一附加線圈、一返驰二極體，以提供一 能量回收路徑之順向式轉換電路。 /、 【先前技術】 1月參考第一圖，為習知順向式轉換電路電路示意圖。 其中轉換電路主要由功率開關Q1、變壓器T1、二極體 D2 ’以及輸出電感l〇輸出電容c〇所組成，其工作原理簡 述如下： μ 91 戈0第一 圖所示 一 . I功半開關W净逋吋，輸入電壓νΐ 會，應到變壓器Τ1之初級繞組N1上。此時在變壓^T1 =j級繞組N2上，會感應出與N1繞組相應之電壓，所以 旎I就會順向至次級電路，並經由二極體D1與輪出電感 Lo’然後傳送到負載端(LQad);同時，在初級繞組上會漸 2 :化電流(Magnetizmg Cu麵t)流過，並有磁能量：存 " 在此階段二極體處於逆向偏壓狀態。 电極ϊί考第—圖#功率開關斷開時，變壓器了！上之娃 二極不7.Γ軸而逆轉，如此會使: 、交成逆向不^通而二極體说則進能。 此時負載端之能量係由輸出電@ 、 &、 所儲存之磁m , C〇，及輪出電感Lo 唯卄爻砀能置、經由二極體D2來提供。 導通=考第—圖，由於順向式轉換電路其在功率開關φ 卜間，變壓器T1初級繞組尺 〕Qi 其能量將_存在變㈣T1之磁場/有=化=“通，而 琢中。而當功率開關Q1斷 l27376〇 開時，若是轉換電路中沒有提供 =lai¥ng)或能量回收(Energy ReeQvery)之路^丨，(Voltage :之能量會釋放於功率開關Q1上，產生很: 則所儲 別在功率開關Q1之切換次數㈣下，係：：：壓 關Q1之毁壞。 ㈢V致功率開 電路參二Γ係為習知具吸收網路之順向式轉換1 講不'5 ®。在習知技術中係有彻1 ^奐电路 一返馳二極體D3連接於變犀哭T] 透過 來作Α1二，u T1之初級繞組m上，用 —作為α推制或能量回收之路#，該吸收 用 -極體D3、一電阻器R、與—電容器c組成。係由 請參考第三圖，係為習知具重設緩組之 :,路示意圖。在習知技術中更有利取::d —近於變壓器T1之初級繞組m 二-組Μ纏 D3 VI ；t 之路徑，係將能量回收至輸入電壓Vi。 ’、、、犯里回收 請參考第四圖，係為f知具錄式二極(F D1〇des)之順向式轉換電路電路示意圖。 eelmg 用二組切換M Ql、Q2搭配二飛輪二極㈣^路係利 動作，用以達到輸入電壓VI之取 私又替 的。 ％侍以及肊！之回收等目 請參考第五圖，係為f知具_電 換電路電路示意圖。為了防止由變壓哭 、向式轉 與次級繞組N2間之電場_合所^ =繞組N1 以於習知技術中’更有在轉換電路之所 繞組N2介面上’分別設置有1場屏蔽：。二= 1273760 蔽其一端係分別連接於初級繞組N1與次級繞級N2 一定電位蠕，用以阻斷初次級間交變電場之耦合。 “ π參考第六圖，係為習知具屏蔽繞組之順向式轉換命 2電，示意圖。其中，轉換電路係設置一屏蔽繞級二4、二 ，壓器Τ1之二次側，其一端係連接到次級繞組Ν2之一 4 級苓考端g，另一端則空接，且其繞線相位及匝數與其才人 對應的初級繞組介面層相當，致使其上之交變電場與/、目 對應的初級繞組介面層之交變電場相若，因 的電位差相抵消，用以避免由變壓器T1之 、、、間 次級繞組N2間之電場耦合所引致之電磁 與 屏敝繞組Ν4由於其一端為空接、沒有負載，其σ二一疋， 可以很高，因此在轉換電路高頻的工作中 貝因數 容易因自我諧振(SelfResonance)現象，而Ν4报 磁干擾。 而產生有害的的電 【發明内容】 有鏗於此，本發明具附加線圈之順 利用一附加線圈連接-錢二極體，提路，係 徑’亚經由電路拓樸之設計，係可以:I回收路 次級繞組N2間之電場屏蔽。 #'、、、、，缺N1與 本發明一種具附加線圈之順向式轉 變壓器之初級繞組連接到一電源及—切;=:係利用- 初級電路。並，變壓吸 π卩以形成一 到—輪出雷玄、°。之认、，及、几、，且係峻過―轉換電路連拯 巧輸出电奋，以形成一次級電路 塔連接 於該輸出電容之1载使用。 作到並接 再者，轉換電路中更有一附加線圈，1 咸次級繞組之一端， 、/、力而係連接於 而另一端係透過—堤馬也二極體連接到該 1273760 輸出電容。藉此，該附加線圈連接該返馳二極體，係在該 切換開關斷開時，提供一能量回收路徑將該切換開關導 通時該電源所儲存於該變壓器之能量，回收至該輸出電 容，並藉由該輸出電容，以箝制初級繞組所感應之返馳電 壓。 本發明一種具附加線圈之順向式轉換電路，其更可以利用 該附加線圈，固定鄰近設置於變壓器初級繞組，並連接變 壓器之次級繞組用來作為初級繞組與次級繞組間之電場 屏蔽，從而提供改善電磁干擾的作用。 - 為了進一步暸解本發明特徵及技術内容’請參閱以下 有關本發明之詳細說明與附圖，然而所附圖式僅提供參考 與說明用，並非用來對本發明加以限制。 【實施方式】 請參考第七圖，係為本發明具附加線圈之順向式轉換 電路電路示意圖。本發明一種具附加線圈之順向式轉換電 路1，係利用一變壓器T1之一初級繞組N1連接到一電源 VI、一切換開關Q1及一初級參考端G，以形成一初級電 路P1。並，變壓器T1之次級繞組N2係透過一電力轉換 電路12連接到一輸出電容Co，以形成一次級電路P2，且 用以提供電力到並接於該輸出電容Co之一負載使用。 再者，順向式轉換電路1中更有一附加線圈N3，其一 端係連接於該次級繞組N2之一端，另一端係透過一返馳 二極體D3連接到該輸出電容Co。藉此，該附加線圈N3 連接該返馳二極體D3，係在該切換開關Q1斷開時，提供 一能量回收路徑將該切換開關Q1導通時該電源VI所儲 存於該變壓器T1之磁能量，回收至該輸出電容Co，並藉 1273760 由該輸出電容Co，以箝制初級繞組N2所感應之一返馳電 壓。 複參考第七圖，其中該附加線圈N3，係設置於該初級繞組 N1與該次級繞組N2之間，並，其繞組上交變電場之相位 與該初級繞組N1上的相同。同時，該附加線圈N3之線圈 繞組匝數η，係與其所相對應的初級繞組介面層之線圈匝 數相若。並，該電力轉換電路12，係藉由一順向二極體 D1之一端連接於該次級繞組Ν2之一端，另一端係透過一 輸出電感Lo連接到該輸出電容Co。並，該次級繞組Ν2 之另一端，係連接於一次級參考端g、該輸出電容Co，並 透過一飛輪二極體D2連接到該輸出電感Lo。 如上述說明中，當切換開關Q1導通時，該輸入電源 VI會供應到變壓器T1之初級繞組N1上，此時，變壓器 T1繞組上會漸漸有磁化電流流過，並將能量儲存於其中。 同時，在變壓器T1之次級繞組N2上，係會感應與N1繞 組相當之電壓，所以此能量就會順向轉移至次級繞組N2， 並經由順向二極體D1與儲能元件Lo，然後傳送到負載， 而此時飛輪二極體D2則會處於逆向偏壓狀態。 複參考第七圖，當切換開關Q1斷開時，變壓器T1上 之繞組極性會反轉，如此會使得順向二極體D1變成逆向 不導通，而飛輪二極體D2則進入導通狀態。此時負載之 能量係由輸出電容Co，及輸出電感Lo所儲存之能量、經 由飛輪二極體D2來提供。 複參考第七圖，由於順向式轉換電路1其在切換開關 Q1導通期間，能量會轉移輸出到負載，而變壓器T1初級 繞組N1中會有磁化電流流通，而其能量將儲存在變壓器 1273760 T1之磁場中。而當切換開關Q1斷開時，此能量係會透過 該附加線圈N3、該返馳二極體D3傳送到該輸出電容Co， 以提供一能量回收路徑。能量回收路徑係將該儲存於該變 壓器T1之磁能量，回收至該輸出電容Co，並藉由該輸出 電容Co,用以箝制初級繞組N1在該切換開關Q1斷開時， 所感應之一返馳電壓。因而可以保護切換開關Q1不因返 驰電壓或功率過大而損壞。 複參考第七圖，該附加線圈N3可用以防止順向式轉 換電路中變壓器T1，其初級繞組N1與次級繞組N2間因 電場耦合而誘發之電磁干擾現象。並且，可以改善習知技 術中，因為屏蔽繞組之一端空接，衍生出高頻電磁干擾之 缺點。 綜上所述，本發明一種具附加線圈之順向式轉換電路，係 設置有一附加線圈N3，其一端係連接於變壓器T1之次級 繞組N2 —端，另一端係透過一返馳二極體D3連接到該輸 出電容Co。藉此，該附加線圈N3連接該返驰二極體D3， 係在該切換開關斷開時，提供一能量回收路徑’將該切換 開關導通時電源VI所儲存於該變壓器T1之磁能量，回收 至該輸出電容Co，並藉由該輸出電容Co,以箝制變壓器 T1之初級繞組N1所感應之返馳電壓。如上述說明中，本 發明更可以利用該附加線圈N3，固定鄰近設置於變壓器 T1之初級繞組N1，並連接變壓器T1之次級繞組N2，用 來作為初級繞組N1與次級繞組N2間之電場屏蔽作用。 惟，上述所揭露之圖式、說明，僅為本發明之實施例 而已，凡精于此項技藝者當可依據上述之說明作其他種種 之改良，而這些改變仍屬於本發明之發明精神及以下所界 10 1273760 定之專利範圍中。 【圖式簡單說明】 第一圖為習知順向式轉換電路電路示意圖； 第二圖為習知具吸收網路之順向式轉換電路電路示意圖； 第三圖為習知具重設繞組之順向式轉換電路電路示意圖； 第四圖為習知具飛輪式切換開關之順向式轉換電路電路 示意圖； 第五圖為習知具EMI電場屏蔽之順向式轉換電路電路示 意圖； 第六圖為習知具屏蔽繞組之順向式轉換電路電路示意圖； 及 第七圖為本發明具附加線圈之順向式轉換電路電路示意 圖。 【主要元件符號說明】 習知： Q1功率開關 T1變壓器 D卜D2二極體 Lo輸出電感 Co輸出電容 N1初級繞組 N2次級繞組 Load負載端 11 1273760 SN吸收網路 D3返馳二極體 R電阻器 C電容器 N3擷取繞組 VI輸入電壓 Ql、Q2切換開關 D4、D5二極體 EM固定之電場屏蔽 N4屏蔽繞組 G初級參考端 g次級參考端 本發明： 1順向式轉換電路 T1變壓器 N1初級繞組 N2次級繞組 VI電源 Q1切換開關 G初級參考端 P1初級電路 P2次級電路 12電力轉換電路 Co輸出電容 12 12737601273760 IX. Description of the invention: [Technical field of the invention] A forward-type conversion circuit with an additional coil, in particular, a secondary coil in a variable-pressure state, an additional coil, and a returning diode are provided to provide A forward conversion circuit of an energy recovery path. /, [Prior Art] Referring to the first figure in January, it is a schematic diagram of a conventional forward conversion circuit. The conversion circuit is mainly composed of a power switch Q1, a transformer T1, a diode D2', and an output inductor l〇 output capacitor c〇. The working principle is as follows: μ 91 戈0 The first figure shows one. When the switch W is clean, the input voltage νΐ will be applied to the primary winding N1 of the transformer Τ1. At this time, on the transformer NT1 = j winding N2, the voltage corresponding to the N1 winding is induced, so 旎I will go to the secondary circuit and pass through the diode D1 and the wheel inductance Lo'. To the load end (LQad); at the same time, on the primary winding will gradually become 2: the current (Magnetizmg Cu surface t) flows, and there is magnetic energy: save " At this stage the diode is in a reverse bias state. Electrode ϊί考第图# When the power switch is disconnected, the transformer is gone! On the second pole, the pole is not reversed by the axis. This will make: At this time, the energy of the load terminal is provided by the output power @, &, the stored magnetic m, C〇, and the wheel-out inductance Lo, which can be provided via the diode D2. Conduction = test - map, because the forward conversion circuit is between the power switch φ, the transformer T1 primary winding scale] Qi its energy will be _ existed (four) T1 magnetic field / have = = = pass, and 琢. When the power switch Q1 is turned off, the circuit is not provided with =lai¥ng) or energy recovery (Energy ReeQvery). (Voltage: the energy is released on the power switch Q1, resulting in: The number of switchings in the power switch Q1 is (4), the system::: the pressure of Q1 is destroyed. (3) The V-power-opening circuit is a conventional conversion of the absorption network with a absorbing network. In the prior art, there is a 1 ^ 奂 circuit, a returning diode D3 is connected to the rhinoceros crying T] through the first winding, u T1 primary winding m, with - as α push or energy recovery The road #, the absorption is composed of a polar body D3, a resistor R, and a capacitor c. Please refer to the third figure, which is a conventional resetting group: a schematic diagram of the road. It is more advantageous to take::d—near the primary winding of the transformer T1, m-group entangled D3 VI; the path of t is to recover energy to Into the voltage Vi. ',,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, With the two flywheel two poles (four) ^ road system action, to achieve the input voltage VI of the private and replacement. % wait and 肊! Recycling, please refer to the fifth picture, is the knowledge of the _ electric circuit circuit Schematic. In order to prevent the electric field between the variable pressure crying, the turning mode and the secondary winding N2 _ _ ^ winding N1 in the prior art 'more on the winding circuit N2 interface of the conversion circuit' respectively set 1 Field Shield: 2 = 1273760 One end is connected to the primary winding N1 and the secondary winding N2 with a certain potential creep to block the coupling of the alternating electric field between the primary and secondary. " π refers to the sixth figure, A conventional schematic diagram of a shielded winding is shown in Fig. 2, wherein the conversion circuit is provided with a shield winding stage 2, 2, and a secondary side of the pressure device ,1, one end of which is connected to one of the secondary windings Ν2 Level 4 is at the end g, and the other end is empty, and its winding phase and number of turns correspond to its talents. The primary winding interface layer is equivalent, so that the alternating electric field on it is similar to the alternating electric field of the corresponding primary winding interface layer, and the potential difference is cancelled to avoid the transformer T1, The electromagnetic field and the screen winding Ν4 caused by the electric field coupling between the secondary windings N2 are vacant and have no load at one end, and the σ 二 疋 can be very high, so the factor of the shell is easy to be used in the high frequency operation of the conversion circuit. Self-resonance (SelfResonance) phenomenon, while Ν4 reports magnetic interference, and produces harmful electricity. [Invention] In this case, the present invention has an additional coil connection with an additional coil connection - money diode, path, system The path 'sub-circuit design through the circuit topology can be: I recover the electric field shielding between the secondary winding N2. #',,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, And, the pressure is increased by π 卩 to form a to - turn out Xuan Xuan, °. The recognition, the sum, the few, and the sturdy--conversion circuit evenly output the electric excitement to form a primary circuit tower connected to the output capacitor for one load. In addition, there is an additional coil in the conversion circuit, one of the two ends of the salt secondary winding, the /, the force is connected to the other end, and the other end is connected to the 1273760 output capacitor. Thereby, the additional coil is connected to the flyback diode, and when the switch is turned off, an energy recovery path is provided to turn on the energy stored in the transformer when the switch is turned on, and the output capacitor is recovered. And the output capacitor is used to clamp the flyback voltage induced by the primary winding. The invention relates to a forward conversion circuit with an additional coil, which can further utilize the additional coil to be fixed adjacent to the primary winding of the transformer and connect the secondary winding of the transformer for shielding the electric field between the primary winding and the secondary winding. Thereby providing the effect of improving electromagnetic interference. The detailed description of the present invention and the accompanying drawings are to be understood as the [Embodiment] Please refer to the seventh figure, which is a circuit diagram of a forward conversion circuit with an additional coil according to the present invention. A forward switching circuit 1 with an additional coil is connected to a power supply VI, a switching switch Q1 and a primary reference terminal G by a primary winding N1 of a transformer T1 to form a primary circuit P1. Further, the secondary winding N2 of the transformer T1 is connected to an output capacitor Co through a power conversion circuit 12 to form a primary circuit P2, and is used to supply power to a load connected to the output capacitor Co. Further, the forward converting circuit 1 further has an additional coil N3 connected at one end to one end of the secondary winding N2 and the other end connected to the output capacitor Co through a flyback diode D3. Thereby, the additional coil N3 is connected to the flyback diode D3, and when the switch Q1 is turned off, an energy recovery path is provided to turn on the magnetic energy stored in the transformer T1 when the switch Q1 is turned on. Recycling to the output capacitor Co, and borrowing 1273760 from the output capacitor Co to clamp a return voltage induced by the primary winding N2. Referring to the seventh figure, the additional coil N3 is disposed between the primary winding N1 and the secondary winding N2, and the phase of the alternating electric field on the winding is the same as that on the primary winding N1. At the same time, the number of winding turns η of the additional winding N3 is similar to the number of turns of the primary winding interface layer corresponding thereto. The power conversion circuit 12 is connected to one end of the secondary winding Ν2 by one end of a forward diode D1, and the other end is connected to the output capacitor Co through an output inductor Lo. And the other end of the secondary winding Ν2 is connected to the primary reference terminal g, the output capacitor Co, and is connected to the output inductor Lo through a flywheel diode D2. As described above, when the switch Q1 is turned on, the input power source VI is supplied to the primary winding N1 of the transformer T1. At this time, a magnetizing current gradually flows through the winding of the transformer T1, and energy is stored therein. At the same time, on the secondary winding N2 of the transformer T1, the voltage corresponding to the N1 winding is induced, so this energy is transferred to the secondary winding N2 in the forward direction, and via the directional diode D1 and the energy storage element Lo, It is then transferred to the load, while the flywheel diode D2 is in a reverse biased state. Referring back to the seventh figure, when the switch Q1 is turned off, the polarity of the winding on the transformer T1 is reversed, which causes the forward diode D1 to become reversely non-conducting, and the flywheel diode D2 enters an on state. At this time, the energy of the load is supplied from the output capacitor Co and the energy stored in the output inductor Lo via the flywheel diode D2. Referring back to the seventh figure, since the forward switching circuit 1 is in the conduction state of the switching switch Q1, the energy is transferred to the load, and the magnetizing current flows in the primary winding N1 of the transformer T1, and the energy thereof is stored in the transformer 1273760 T1. In the magnetic field. When the switch Q1 is turned off, the energy is transmitted to the output capacitor Co through the additional coil N3 and the flyback diode D3 to provide an energy recovery path. The energy recovery path recovers the magnetic energy stored in the transformer T1 to the output capacitor Co, and the output capacitor Co is used to clamp the primary winding N1 when the switch Q1 is turned off. Chi voltage. Therefore, the changeover switch Q1 can be protected from damage due to the flyback voltage or excessive power. Referring to the seventh figure, the additional coil N3 can be used to prevent the electromagnetic interference phenomenon induced by the electric field coupling between the primary winding N1 and the secondary winding N2 in the forward-transforming circuit. Moreover, it is possible to improve the conventional technique because the one end of the shield winding is vacant, and the disadvantage of high frequency electromagnetic interference is derived. In summary, the present invention provides a forward-type conversion circuit with an additional coil, which is provided with an additional coil N3, one end of which is connected to the secondary winding N2 end of the transformer T1, and the other end is transmitted through a returning diode. D3 is connected to the output capacitor Co. Thereby, the additional coil N3 is connected to the flyback diode D3, and when the switch is turned off, an energy recovery path is provided, and the magnetic energy stored in the transformer T1 by the power source VI when the switch is turned on is recovered. To the output capacitor Co, and by the output capacitor Co, to clamp the flyback voltage induced by the primary winding N1 of the transformer T1. As described above, the present invention can further utilize the additional coil N3 to fix the primary winding N1 disposed adjacent to the transformer T1 and connect the secondary winding N2 of the transformer T1 for use as an electric field between the primary winding N1 and the secondary winding N2. Shielding effect. However, the drawings and descriptions disclosed above are only examples of the present invention, and those skilled in the art can make various other modifications according to the above description, and these changes still belong to the inventive spirit of the present invention. The following is bounded by the patent scope of 10 1273760. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a schematic diagram of a conventional forward conversion circuit; the second figure is a schematic diagram of a conventional forward conversion circuit with an absorption network; Schematic diagram of the circuit of the conversion circuit; the fourth figure is a schematic diagram of the forward-to-conversion circuit of the conventional flywheel type switch; FIG. 5 is a schematic diagram of the circuit of the forward conversion circuit with the EMI electric field shielding; A circuit diagram of a forward conversion circuit having a shield winding; and a seventh diagram of a forward conversion circuit having an additional coil according to the present invention. [Main component symbol description] Convention: Q1 power switch T1 transformer D Bu D2 diode Lo output inductor Co output capacitor N1 primary winding N2 secondary winding Load load terminal 11 1273760 SN absorption network D3 flyback diode R resistor C capacitor N3 draw winding VI input voltage Ql, Q2 switch D4, D5 diode EM fixed electric field shield N4 shield winding G primary reference end g secondary reference end The present invention: 1 forward conversion circuit T1 transformer N1 Primary winding N2 secondary winding VI power supply Q1 switching switch G primary reference terminal P1 primary circuit P2 secondary circuit 12 power conversion circuit Co output capacitor 12 1273760
Lo輸出電感 Load負載 D1順向二極體 D2飛輪二極體 D3返馳二極體 g次級參考端Lo output inductance Load load D1 forward diode D2 flywheel diode D3 flyback diode g secondary reference