200607216 九、發明說明： 【發明所屬之技術領域】 一種具初級側電壓回授之低功率返馳式交換電路，尤指 一種利用變壓器初級侧之辅助繞組取得回授電壓及回授電 流，同時於變壓器次級側透過低壓差穩壓器輸出一穩定的工 作電壓之低功率返馳式交換電路。 【先前技術】 按目前已知的直流電源供應裝置，如交換式電源供應器 中（AC To DC SWlitching Power Supply)中，為縮小變壓 器之體積，大多使用高頻的脈波寬度調變（PWM)控制直流輸 出電壓，如第一圖所示，係為習知返馳式電源供應裝置之電 路示意圖’變壓器T1係將電路區分成為一次侧之前級電路 101與二次側之後級電路102，該一次侧101與該二次側1〇2 間係以一光電晶體111及一光二極體112分離該一次側1〇1 與該二次側102之電信號，但卻可利用光信號回授二次侧1〇2 之電壓或電流輸出變化信號至一次侧101，以同步調整兮一 次侧101及二次側102之電壓及電流變化量，或者做為^ 流及短路保護之迴授信號。 ° “ 配合第二圖，係為習知返馳式電源供應裝置之電路波妒 示意圖，請復參考第一圖，其中於一次侧1〇1輸入一交流‘ 壓VAC，交流電壓VAC係經過一橋式整流器bD1及一高壓^袁 波電容ci後成為-直流漣波電壓B+，直流漣波電壓 藉由一脈波調整控制單元U1控制功率電子開關則之導调 期，進而傳送道該變壓器T1之一次側繞組。同時，變： T1之二次侧繞組係感應輸出電壓，並透過二極體卯及電= 電容C5整流濾波後，產生穩定直流電壓v〇輸出。直流電壓 200607216 vo並透過-回授穩壓器光偶合器 V0變化回授至一次側101之脈波寬度 電壓 調整脈波輸出顺來歡輪出直流電壓VG^ 藉以 係由該光電晶體111及該先二極體112纽成Γ⑼合器U3 明復翏考#圖，在習知技藝巾，該返馳 置主要是交流電壓轉換成直流電壓輸出的電路，200607216 IX. Description of the invention: [Technical field of invention] A low-power flyback switching circuit with primary side voltage feedback, in particular, an auxiliary winding using a primary side of a transformer to obtain a feedback voltage and a feedback current, The secondary side of the transformer outputs a low-power flyback switching circuit with a stable operating voltage through a low-dropout regulator. [Prior Art] In the currently known DC power supply device, such as AC To DC SWlitching Power Supply, in order to reduce the volume of the transformer, high frequency pulse width modulation (PWM) is often used. Controlling the DC output voltage, as shown in the first figure, is a schematic circuit diagram of a conventional flyback power supply device. The transformer T1 divides the circuit into a primary side previous stage circuit 101 and a secondary side subsequent stage circuit 102. An electrical signal between the primary side 1〇1 and the secondary side 102 is separated between the side 101 and the secondary side 1〇2 by a photoelectric crystal 111 and a photodiode 112, but the optical signal can be used to feedback twice. The voltage or current output change signal of the side 1〇2 is sent to the primary side 101 to synchronously adjust the voltage and current variation of the primary side 101 and the secondary side 102, or as a feedback signal for the current and short circuit protection. ° “With the second diagram, it is a schematic diagram of the circuit ripple of the conventional flyback power supply device. Please refer to the first figure. In the first side, input 1 一 AC VAC, AC voltage VAC through a bridge. The rectifier bD1 and a high voltage ^yuan wave capacitor ci become -DC chopping voltage B+, and the DC chopping voltage is controlled by a pulse wave adjusting control unit U1 to control the power electronic switch, and then the transformer T1 is transmitted. Primary winding. Simultaneously, the secondary winding of T1 senses the output voltage and is rectified and filtered by the diode 卯 and the electric capacitor C5 to generate a stable DC voltage v 〇 output. DC voltage 200607216 vo and pass-back The regulator photocoupler V0 is fed back to the pulse width of the primary side 101. The voltage is adjusted. The pulse output is followed by the DC voltage VG^, whereby the phototransistor 111 and the first diode 112 are formed into a Γ (9) The U3 is a circuit of the conventional technology, and the returning is mainly a circuit for converting an alternating voltage into a direct current voltage output.
之功率電子開關Q1導通時能量因變二理f二 认f侧極性相反，以致二次侧1G2之二極W 通存於變壓11T1上’待功率電子開關Q1導== 變壓為T1極性反轉，改由二次侧1〇2之 接著口 4 以釋放儲存在變壓器T1上之儲存能量。胺以接者導通， 、、由於習知返馳式電源供應裝置 :電路f要搭 滤波電容α、回授穩壓器U2與光偶合器U3才能正=， 使得交換電路的製作成本高，並且元件在交換電路中乍係 佔有很大之面積，使得交換電路產品體積非常大。 【發明内容】 有鑑於此，本發明具初級侧電壓回授之低功率返馳式交 換，路，其主要目的係使用變壓器初級侧回授方式取得回授 電壓及回授電流，並藉此由變壓器次級侧透過一低壓差穩壓 器輸出穩定之直流工作電壓。同時，可以省去習用技術^所 使用之高壓濾波電容C1、回授穩壓器U2與光偶合器U3，用 來降低電路製作成本和電路面積。 為達上述目的，本發明具初級侧電壓回授之低功率返馳 式交換電路，係利用一脈寬調變控制器驅動一功率電子開關 之切換動作，使得一輸入直流電力可以分別透過一變壓器及 一笫一整流儲能單元送出一輸出電壓，該變壓器具有一初級 200607216 繞組、一次級繞阻及一輔助繞阻。該輸入直流電力係由連接 於5亥-次側繞組之-整流單TL ’將—交流電力作整流轉換而 得，並傳送到該一次側繞組。交換電路利用一電壓回授單元， 連接於該輔助繞組與該脈寬調變控制器，並從該輔助繞组取 得-回授電壓’同時將該回授電壓傳送到該脈寬調^控制 器。再者交換電路利用-電流回授單元，連接於該脈寬調變 控制器與該功率電子開關，藉著透過該功率電子開關取得一 回授電流，並將該回授電流轉換成為電壓值傳送到該脈寬調 變控制器。交換電路係利用-低壓差穩壓器，連接於該整流 儲能單元储該輸出電壓敎成為—卫作電独提供負載使 用0 、 為了使f審查委貝能更進—步瞭解本發明特徵及技 容，請參閱以下有關本發明之詳細說明與附圖， 圖式僅提供參考與說㈣，並_來對本發以 【實施方式】 請參考第三ffi，係為本發日月具初級侧電壓回授 返，式交換電路示意圖。本發明使用—個具有—初級繞组 TH、-次級繞阻Tr2及-辅助繞阻加之 ^量轉換之料。同時脈寬霞控制器π = 率電子開關Q1之切換動作，使得—輪 變壓器Μ一第一整流儲能單元==透過: 該輪入直流電力係由連接_ —次側繞組Τη之―^再者元 BD1，將一交流電力作整流轉換而得， 正极早 TH。交換電路利用-電壓回授單元&，^卜次侧繞組 ，該脈寬調變控制器U卜並從_繞=== 授電壓，同時將該回授電壓傳送到該脈寬調變控制 200607216 者交換電路利用-電流回授單元24，連祕該脈寬 器Ui與該功㈣子開_，縣透過該功㈣相關Q1 工取 並iT授電流轉換成為電隸傳送到該脈 見凋、交控制盗U1。父換電路係利用一低壓差穩壓器26， 於該第-整流儲能單元20係將該輸出電壓穩定成 電壓VO以提供負载使用。 _ #When the power electronic switch Q1 is turned on, the energy is changed according to the second principle, and the polarity of the f side is opposite, so that the second pole of the secondary side 1G2 is stored on the transformer 11T1. The power electronic switch Q1 is controlled == the voltage is changed to the T1 polarity. Reverse, change to the secondary port 4 of the secondary side 1 to release the stored energy stored on the transformer T1. The amine is turned on by the receiver, and, due to the conventional flyback power supply device, the circuit f is required to filter the capacitor α, and the feedback regulator U2 and the optical coupler U3 can be positively =, so that the switching circuit is expensive to manufacture, and The components occupy a large area in the switching circuit, making the switching circuit product very large. SUMMARY OF THE INVENTION In view of the above, the present invention has a low-power flyback switching with primary side voltage feedback, and the main purpose thereof is to obtain a feedback voltage and a feedback current by using a transformer primary side feedback method, and thereby The secondary side of the transformer outputs a stable DC operating voltage through a low dropout regulator. At the same time, the high-voltage filter capacitor C1 used by the conventional technology can be omitted, and the regulator U2 and the photocoupler U3 can be used to reduce the circuit manufacturing cost and circuit area. In order to achieve the above object, the low-power flyback switching circuit with primary side voltage feedback is driven by a pulse width modulation controller to drive a power electronic switch, so that an input DC power can be transmitted through a transformer. And a rectifier energy storage unit sends an output voltage, the transformer has a primary 200607216 winding, primary winding and an auxiliary winding. The input DC power is rectified and converted by the rectified single TL ' connected to the 5 Hz-secondary winding, and transmitted to the primary side winding. The switching circuit utilizes a voltage feedback unit coupled to the auxiliary winding and the pulse width modulation controller, and takes a feedback voltage from the auxiliary winding while transmitting the feedback voltage to the pulse width modulation controller . Further, the switching circuit utilizes a current feedback unit connected to the pulse width modulation controller and the power electronic switch, and obtains a feedback current through the power electronic switch, and converts the feedback current into a voltage value transmission. Go to the pulse width modulation controller. The switching circuit is connected to the rectifying energy storage unit to store the output voltage by using a low-dropout voltage regulator, and the utility model provides that the load is used by the Guardian Electric Co., Ltd., so that the f-review can be further improved. Please refer to the following for a detailed description of the present invention and the accompanying drawings. The drawings only provide reference and say (4), and _ to the present invention. [Embodiment] Please refer to the third ffi, which is the primary side of the current day and month. Voltage feedback, schematic diagram of the switching circuit. The present invention uses a material having a primary winding TH, a secondary winding Tr2, and an auxiliary winding plus a quantity conversion. At the same time, the pulse width Xia controller π = rate electronic switch Q1 switching action, so that the wheel transformer Μ a first rectification energy storage unit == transmission: the wheel DC power is connected by the _ - secondary winding Τ η ^ The BD1 is obtained by rectifying and converting an AC power, and the positive electrode is TH early. The switching circuit utilizes a voltage feedback unit &, a second side winding, the pulse width modulation controller Ub and a voltage from the _wrap ===, and simultaneously transmits the feedback voltage to the pulse width modulation control 200607216 The switching circuit utilizes a current feedback unit 24, which is connected to the pulse width Ui and the power (4) sub-opening _, the county through the work (4) related Q1 work and iT current conversion into electric splicing to the pulse And control theft U1. The parent switching circuit utilizes a low dropout regulator 26 in which the output voltage is stabilized to a voltage VO to provide load utilization. _ #
請復參考第三圖，其中該整流單元則係為—全样敗、★ 單70。亚该電壓回授單元22係透過一整流濾波單元2加 辅助繞組ΊΥ3取得之回授電壓進行整流及濾波動作，同時， 整川l及濾波後之回授電壓係經由一分壓電阻224進行分壓， 並傳送到該脈寬調變控制器识。再者，上述中本發明：二 之該功率電子開關Q1係為一 _道場效電晶體。並該功率電 子開關Q1係串接於該初級繞組Trl，因此該功率電子開關以 取得之回杈電流係為流過該初級繞組之電流，並該功率電子 開關Q1之控制端連接到該脈寬調變控制器讥，係 端接受該脈寬調變控制器π控制。 fJ 復多考弟一圖其中该輔助繞阻Tr3與該次級繞阻τΓ2 之繞組極性係為同相，因此，本發明可以透過變壓器繞組之 磁通偶合關係，使得在次級繞阻Tr2錢之電壓變化會和輔 助繞阻T/3所感應之回授電壓成近似正比。同時，於^一整 流儲能單元20送出之輸出電壓v〇係為含有兩倍交流輸入頻 =之/連波電壓Vr，该輸出電壓係經過低壓差穩壓器π穩 壓後，產生穩定的直流輸出工作電壓v〇以提供負载使用。上 述說明中，本發明交換電路更有一突波消除單元28並接於該 初級繞組Trl，係於該功率電子開關Q1截止時，進行該初級 繞組Trl間突波電壓之消除。 200607216 配合第二圖，請參考第四圖，係為本發明具初級侧電壓 回授之低功率返馳式交換電路波形示意圖。一交流電力VAC 透過該整流單兀BD1整流轉換成該輸入直流電力B+，並傳 达到該初級繞組Trl。同時，脈寬調變控制器讥係透過該電 壓回授單元22從輔助繞組Tr3取得回授電壓，及透過該電流 回授單元24從該功率電子卩· Q1取得回授電流。脈寬調變 控制器U1取得回授電壓與回授電流並輸出—脈寬調整訊號 PWM，傳送到功率電子開關Q1之控制端以控制該功率電子開 關Q1之切換動作。直流電力B+藉由功率電子開關Q1之切 ，動作，係透過變壓器Tr作能量轉換，並透過第一整流儲能 單兀20輸出含有兩倍交流輸入頻率漣波電μ &之輸出電壓 V〇。亥輸出電壓VCM系經過低壓差穩壓器2β穩壓後，係將漣 波電£ Vr除去進而產生穩定的直流輸^卫作電壓—，以提 供負載使用。 -配合第三圖，請參考第五®，係為本發明另-實施例電 路不意圖。第五圖所示之低功率返馳式交換電路與第三圖所 不之電路其差異處，係在於其巾該M|| Tr更具有—次級侧 =繞組τη，該次級側輔助繞組Tr4係感應輸出—次級侧 助電力’並次級侧輔助電力透過—第二整流儲能單元2了， 提供該低壓紐壓器26卫作所f之電力。並，於電路其他單 =功能上與動作，細本發明第三圖所示之低功率返驰 式父換電路相同，在此不多加贅述。 換:Γ上所述’本發明係彻變壓11初級彻授方式取得回 回杈電流’亚藉此由變壓器次級側透過-低壓差穩 戶斤之直流工作電麼。同時，可以省去習用技術t 斤使用之〶壓濾、波電容回授穩塵器與光偶合器，使得降低零 200607216 件成本和電路板面積，並可縮小產品體積。 專利2中ίΓί全符合發明專利之進步性要件，故爰依 ί = 查並准予本案，以保障創作者之權益， 4局之貝審查委Μ有任何的稽疑，請衫來函指示。 明之t以上所述’僅為本發明讀之具體實關，惟本發 t特被亚不侷限於此，任何熟悉該項技藝者在本創作 利範’可㈣思及之變化或修飾’皆可涵蓋在以下本案之專 【圖式簡單說明】 弟圖為習知返馳式電源供應裝置之電路示意圖· 第一圖為習知返馳式電源供應裝置之電路波形示意圖· 第三圖為本發明具初級侧電壓回授之低功率返馳式交換電路 示意圖； 第四圖為本發明具初級侧電壓回授之低功率返馳式交換電路 波形示意圖；及 第五圖為本發明另一實施例電路示意圖。 【主要元件符號說明】 習知： τι變壓器 前級電路 1〇2後級電路 Ul光電晶體 U2光二極體 BDl橋式整流器 200607216 ci高壓濾波電容 U1脈波調整控制單元 Q1功率電子開關 D2二極體 C5電解電容 U2回授穩壓器 U3光偶合器 本發明：Please refer to the third figure, where the rectification unit is - all-in-one, ★ single 70. The voltage feedback unit 22 performs a rectification and filtering operation through a rectification voltage obtained by the rectifying and filtering unit 2 and the auxiliary winding ΊΥ3, and the retort voltage and the filtered feedback voltage are divided by a voltage dividing resistor 224. Press and transfer to the pulse width modulation controller. Furthermore, in the above invention, the power electronic switch Q1 is a one-channel field effect transistor. The power electronic switch Q1 is connected in series to the primary winding Tr1. Therefore, the power electronic switch obtains a return current as a current flowing through the primary winding, and the control end of the power electronic switch Q1 is connected to the pulse width. The modulation controller 讥, the system accepts the pulse width modulation controller π control. fJ is a multi-cricket picture in which the auxiliary winding Tr3 and the winding resistance of the secondary winding τ Γ 2 are in phase, therefore, the present invention can pass the magnetic flux coupling relationship of the transformer winding, so that the secondary winding Tr2 money The voltage change is approximately proportional to the feedback voltage induced by the auxiliary winding T/3. At the same time, the output voltage v〇 sent by the rectifying energy storage unit 20 is twice the AC input frequency=the continuous wave voltage Vr, and the output voltage is stabilized by the low-voltage difference regulator π. DC output operating voltage v〇 to provide load usage. In the above description, the switching circuit of the present invention further includes a surge removing unit 28 connected to the primary winding Tr1 for eliminating the surge voltage between the primary windings Tr1 when the power electronic switch Q1 is turned off. 200607216 With the second figure, please refer to the fourth figure, which is a schematic diagram of the waveform of the low-power flyback switching circuit with primary side voltage feedback. An AC power VAC is rectified by the rectifying unit BD1 to be converted into the input DC power B+ and transmitted to the primary winding Tr1. At the same time, the pulse width modulation controller 取得 receives the feedback voltage from the auxiliary winding Tr3 through the voltage feedback unit 22, and obtains the feedback current from the power electron 卩·Q1 through the current feedback unit 24. The pulse width modulation controller U1 obtains the feedback voltage and the feedback current and outputs a pulse width adjustment signal PWM, which is transmitted to the control terminal of the power electronic switch Q1 to control the switching operation of the power electronic switch Q1. The DC power B+ is cut by the power electronic switch Q1, and the energy is converted by the transformer Tr, and the output voltage V〇 containing the double-current AC input frequency chopping electric μ is output through the first rectifying energy storage unit 20 . The output voltage VCM is regulated by the low-dropout regulator 2β, which removes the chopping electric current V Vr to generate a stable DC output voltage to provide load. - In conjunction with the third diagram, please refer to the fifth®, which is a circuit of the other embodiment of the invention. The difference between the low-power flyback switching circuit shown in FIG. 5 and the circuit not shown in the third figure is that the M|| Tr of the towel has a secondary side=winding τη, and the secondary side auxiliary winding The Tr4 system senses the output of the secondary side auxiliary power and the secondary side auxiliary power through the second rectifying energy storage unit 2, and supplies the power of the low voltage button 26. Moreover, in the other circuit of the circuit, the function and the action are the same as the low-power fly-back type parent-changing circuit shown in the third figure of the present invention, and will not be described here. For the above description, the present invention is a step-by-step method of obtaining a return current, which is transmitted by the secondary side of the transformer, which is stabilized by the low voltage of the transformer. At the same time, it is possible to eliminate the use of the conventional technology, the pressure filter, the wave capacitor feedback dust collector and the optical coupler, so that the cost and board area of the zero 200607216 can be reduced, and the product volume can be reduced. In patent 2, ίΓί is in full compliance with the progressive requirements of the invention patent. Therefore, according to ί = check and grant the case to protect the rights and interests of the creators The above description is only for the specific implementation of the present invention, but the present is not limited to this, any person familiar with the skill in this creation can be changed or modified. The following is a brief description of the case [Simple description of the drawing] The schematic diagram of the circuit is a circuit diagram of a conventional power-supply device. The first figure is a schematic diagram of the circuit waveform of a conventional fly-back power supply device. Schematic diagram of a low power flyback switching circuit with primary side voltage feedback; FIG. 4 is a schematic diagram of a waveform of a low power flyback switching circuit with primary side voltage feedback according to the present invention; and FIG. 5 is another embodiment of the present invention Circuit diagram. [Main component symbol description] Convention: τι transformer preamp circuit 1〇2 rear stage circuit Ul photoelectric crystal U2 optical diode BDl bridge rectifier 200607216 ci high voltage filter capacitor U1 pulse wave adjustment control unit Q1 power electronic switch D2 diode C5 electrolytic capacitor U2 feedback regulator U3 optical coupling device of the present invention:
Tr變壓器 Trl初級繞組 Tr2次級繞阻 Tr3輔助繞阻 Tr4次級側輔助繞組 U1脈寬調變控制器 Q1功率電子開關 20第一整流儲能單元 BD1整流單元 22電壓回授單元 220整流濾波單元 224分壓電阻 24電流回授單元 26低壓差穩壓器 27第二整流儲能單元 28突波消除單元Tr transformer Tr primary winding Tr2 secondary winding Tr3 auxiliary winding Tr4 secondary side auxiliary winding U1 pulse width modulation controller Q1 power electronic switch 20 first rectification energy storage unit BD1 rectification unit 22 voltage feedback unit 220 rectification and filtering unit 224 voltage divider resistor 24 current feedback unit 26 low dropout regulator 27 second rectification energy storage unit 28 surge elimination unit