1359339 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種升壓轉換系統及方法，特別是指 一種可提高升壓比之升壓轉換系統及方法。 【先前技術】 電源供應器的燒機測試或電池定電流放電等場合常需 要使用升壓系統，目前的升壓系統以升壓型轉換器（b_ Converter)及升降壓型轉換器（Buck_B〇〇st c〇nverter)較為普 遍，但不論為升壓型轉換器或升降壓型轉換器均存在無法 無限制提高升壓比的問題。 參閱圖1，一種升壓型轉換器包括一電感、一功率開 關S〇、一二極體D〇及一電容c〇，且由一脈波控制器㈤未 不）輸出的一脈波控制訊號901的一責任週期（dutycycle)D 控制功率開關S〇的開啟/閉合，其工作原理說明如下： 當導通時間為DT(0<D<1)時，功率開關％閉合（〇n)， 電流1l流經電感L〇且使電感L〇儲能的迴路；當不導通時間 為（l-D)T時，功率開關s〇斷開（0ff)，電流iL流經電感、 二極體D0且對電容C〇充電，由於電感^可以視為一同向 的電源，其電壓與外加電源vin累加，使得輸出電壓v〇ut高 於原本的電壓vin。 參閱圖2，升壓型轉換器在連續導通模式（CCM)下其 升壓比f = ，理論上，雖然升壓比&沒有上限（如虛線部 分）’但貫際上因受限於元件寄生效應以及控制器之能力， 其升壓比達到4至5倍時將下降（如實線部分），因此，實際 5 的升壓型轉換器不能無限制的提高升壓比。 【發明内容】 —有鑑於目則的架構無法有效提高升壓比且同時兼顧扮 决電机源角色’因Λ ’本發明的創作原理是採用具有兩級 之電流源控制架構。 本發明之目@，即I提供一種可提高升壓比之升麼轉 換系統。 於疋，本發明可提高升壓比之升壓轉換系統包含一第 一級升壓電路及一第二級升壓電路。 »亥第級升壓電路具有一第一升壓型轉換器及一第一 回授電路’該第-升壓型轉換器用以接收—輸人電壓並具 有一文一第一脈波控制訊號控制開啟/閉合的第一功率開關 ’該第-回授電路耦接該第一升壓型轉換器，用以偵測載 於該第-功率開關的—電流訊號並回授控制該第—脈波控 制訊號，令該第-升壓型轉換器產生—高於該輸人電壓: 中繼電壓。 該第二級升壓電路具有一第二升壓型轉換器及—第二 回授電路，該第二升壓型轉換器用以接收一中繼電壓並具 有一文一第二脈波控制訊號控制開啟/閉合的第- —刀平開關 ，該第二回授電路耦接該第二升壓型轉換器，用以依據該 中繼電壓回授控制該第二脈波控制訊號，令該第二升壓型 轉換器產生高於該中繼電壓的一輸出電壓。 【實施方式】 有關本發明之前述及其他技術内容、特點盥 /、W 5c又，在 1359339 以下配合參考圖式之較佳實施例的詳細說明中，將可清楚 的呈現。 參閱圖3，本發明可提高升壓比之升壓轉換系統剛的 較佳實施例具有ϋ升壓電路i及—第二級升壓電路2 :其中，第一級升壓電路1接收一輸入電壓％並產生一中 繼電壓Vd’第二級升壓電路2接收該中繼電壓％並產生一 輸出電壓V。。 如圖4所示，第一級升壓電路丨具有一第一升壓型轉 換器（Boost ConVerter)ll及一第一回授電路12，第一升壓型 轉換器11具有一電感L,、一功率開關Si、一二極體D|及 一電容C,，且第一升壓型轉換器u用以接收輸入電壓％ 並受一第一脈波控制訊號301控制。 第一升壓型轉換器11的作用原理是當第一脈波控制訊 301的導通時間為ιηχίΚΕΚ!)時，功率開關&閉合（〇n)，電 流iL流經電感L,且使電感L!儲能的迴路；當不導通時間為 (l-D)T時，功率開關S,斷開（off)，電流圪流經電感Ll、二 極體D,且對電容Q充電’由於電感Ll可以視為一同向的 電源’其電壓與外加電源V i累加，進而輸出一高於該輸入 電壓Vi的中繼電壓vd。 第一回授電路12具有一第一脈寬調變產生器（PWM Generator) 121 及一電流回授控制器（if Current Controller)122，電流回授控制器122用以接收使用者所輸 入的一電流命令101’並取得第一升壓型轉換器11之電感 電流102，且將該電感電流1〇2之回授值與該電流命令1〇1 7 1359339 其輸入電流穩定於所+ αχ ^ '所下之電流命令，以做為一個可控之電 流源輸入。 細納上述’有鐘於目前的架構無法有效提高升壓比， 因此’本發明可提高升壓比之升壓轉換系統 100採用兩級 電流源控制的架構’包括第-級升壓電路1及第二級升壓 電路2 ’利用第一級升壓電路i的電流控制將其輸入電流穩 疋於所下之電流命令，及第二級升壓電路2之輸出電壓v。 被箝制於直流匯流排DCbus，因此能有效的提高升壓比。 惟以上所述者’僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一立電路圖，說明現有的一種升壓型轉換器； 圖2是一示意圖，說明該升壓型轉換器在連續導通模 式下的升壓比； 圖3是一系統方塊圖，說明本發明可提高升壓比之升 壓轉換系統的較佳實施例’其具有第一級升壓電路及一第 —級升壓電路； 圖4是一電路圖’說明第一級升壓電路具有一第一升 壓型轉換器及一第一回授電路； 圖5是一電路圖’說明第二級升壓電路具有一第二升 壓型轉換器及一第二回授電路；及 圖6是一波形示意圖，說明本發明可提高升壓比之升 10 1359339 壓轉換系統實驗所用的輸入電壓、輸出電壓及輸入電流。1359339 IX. Description of the Invention: [Technical Field] The present invention relates to a boost converter system and method, and more particularly to a boost converter system and method that can increase a boost ratio. [Prior Art] The booster system is often required for the power supply's burn-in test or battery constant current discharge. The current boost system is a boost converter (b_ Converter) and a buck-boost converter (Buck_B〇〇). St c〇nverter) is more common, but there is a problem that the boost converter or the buck-boost converter cannot increase the boost ratio without limitation. Referring to FIG. 1 , a boost converter includes an inductor, a power switch S 〇 , a diode D 〇 , and a capacitor c 〇 , and a pulse wave control signal output by a pulse controller (5). A duty cycle D of 901 controls the opening/closing of the power switch S〇, and its working principle is as follows: When the conduction time is DT (0<D<1), the power switch % is closed (〇n), current 1l A circuit that flows through the inductor L〇 and stores the inductor L〇; when the non-conduction time is (1D)T, the power switch s〇 is turned off (0ff), and the current iL flows through the inductor, the diode D0, and the capacitor C. 〇 Charging, since the inductor ^ can be regarded as a power source in the same direction, its voltage is added to the external power supply vin, so that the output voltage v〇ut is higher than the original voltage vin. Referring to Figure 2, the boost converter has a boost ratio f = in continuous conduction mode (CCM). In theory, although the boost ratio & has no upper limit (such as the dotted line), the factor is limited by the component. The parasitic effect and the controller's ability to reduce the boost ratio by 4 to 5 times (such as the solid line portion), therefore, the actual 5 boost converter cannot increase the boost ratio without limit. SUMMARY OF THE INVENTION - In view of the fact that the architecture of the present invention cannot effectively increase the boost ratio while at the same time taking into account the role of the motor source, the authoring principle of the present invention is to employ a two-stage current source control architecture. The object of the present invention, i.e., I, provides a system for improving the boost ratio. In the present invention, the boost converter system with improved boost ratio of the present invention comprises a first booster circuit and a second booster circuit. The first stage boost circuit has a first boost converter and a first feedback circuit. The first boost converter is configured to receive and input a voltage and has a first pulse control signal to be turned on. a first power switch coupled to the first boost converter for detecting a current signal carried on the first power switch and feedback controlling the first pulse control The signal causes the first step-up converter to generate - above the input voltage: the relay voltage. The second stage boosting circuit has a second boosting type converter and a second feedback type circuit for receiving a relay voltage and having a second pulse control signal to be turned on. a closed-to-blade switch, the second feedback circuit coupled to the second boost converter for controlling the second pulse control signal according to the relay voltage feedback, so that the second rise The profiler produces an output voltage that is higher than the relay voltage. [Embodiment] The foregoing and other technical features and features of the present invention will be apparent from the following description of the preferred embodiments of the preferred embodiments. Referring to FIG. 3, a preferred embodiment of the boost converter system of the present invention capable of increasing the boost ratio has a boost boost circuit i and a second boost circuit 2: wherein the first boost circuit 1 receives an input The voltage % generates a relay voltage Vd'. The second stage boosting circuit 2 receives the relay voltage % and generates an output voltage V. . As shown in FIG. 4, the first step-up converter circuit has a first boost converter (Boost ConVerter) 11 and a first feedback circuit 12, and the first boost converter 11 has an inductor L, A power switch Si, a diode D| and a capacitor C, and the first boost converter u receives the input voltage % and is controlled by a first pulse control signal 301. The function of the first boost converter 11 is that when the on-time of the first pulse control signal 301 is ιηχίΚΕΚ!), the power switch & closes (〇n), the current iL flows through the inductor L, and the inductor L The circuit of energy storage; when the non-conduction time is (lD)T, the power switch S, off (off), the current 圪 flows through the inductor L1, the diode D, and charges the capacitor Q 'because the inductance Ll can be regarded The power supply for the same direction 'the voltage is added to the applied power source V i , and further outputs a relay voltage vd higher than the input voltage Vi. The first feedback circuit 12 has a first pulse width modulation generator (PWM Generator) 121 and a current current feedback controller (if current controller) 122. The current feedback controller 122 receives a user input. The current command 101' obtains the inductor current 102 of the first boost converter 11, and the feedback current of the inductor current 1 〇 2 and the current command 1 〇 1 7 1359339 stabilize the input current of + α χ ^ ' The current command is used as a controllable current source input. The above-mentioned 'Yu Zhong's current architecture can not effectively improve the boost ratio, so the present invention can improve the boost ratio of the boost converter system 100 using a two-stage current source control architecture' including the first-stage boost circuit 1 and The second stage boost circuit 2' uses the current control of the first stage boost circuit i to stabilize its input current to the current command and the output voltage v of the second stage boost circuit 2. It is clamped to the DC bus DCbus, so it can effectively increase the boost ratio. However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention, All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical circuit diagram illustrating a conventional boost converter; FIG. 2 is a schematic diagram showing a boost ratio of the boost converter in continuous conduction mode; FIG. System block diagram illustrating a preferred embodiment of a boost converter system with improved boost ratio of the present invention having a first stage boost circuit and a first stage boost circuit; FIG. 4 is a circuit diagram illustrating the first stage The booster circuit has a first boost converter and a first feedback circuit; FIG. 5 is a circuit diagram illustrating that the second boost circuit has a second boost converter and a second feedback circuit; FIG. 6 is a waveform diagram showing the input voltage, output voltage, and input current used in the experiment of the voltage conversion system of the 10 1359339 voltage boosting system.
11 135933911 1359339
【主要元件符號說明】 〔習知 ] 器 901…… …脈波控制訊號 22.. .......第二回授電路 Co…… …電容 201 .......電壓命令 D〇…… * * * -—極體 202 .......分壓電壓 L〇…… …電感 203 .......第二控制訊號 S〇…… …功率開關 301 .......第一脈波控制訊 Vin •…· …外加電源 號 vout…… …輸出電壓 302 ......第二脈波控制訊 〔本創作〕 號 1 ........ …第一級升壓電路 C丨、 c2 ··電容 11....... …第一升壓型轉換 D, ' d2··二極體 器 DCb US ····直流匯流排 12....... …第一回授電路 L, ' L2···電感 100 .·.· …升壓轉換系統 Ri ' r2 · ·電阻 101 ----- …電流命令 S, ' s2···功率開關 102 …· …電感電流 V, ·· .......輸入電壓 103 .··· …第一控制訊號 Vd.· .......中繼電壓 2 ........ …第二級升壓電路 V〇._ .......輸出電壓 21....... …第二升壓型轉換 12[Description of main component symbols] [Practical] 901...... ...pulse control signal 22..............Second feedback circuit Co... Capacitance 201 .... Voltage command D 〇...... * * * - - Polar body 202 . . . Divided voltage L 〇 ... ... Inductance 203 .... Second control signal S 〇 ... ... Power switch 301 ... ....The first pulse control signal Vin.......plus the power supply number vout...... ...output voltage 302...the second pulse control message [this creation] No.1...... ...first stage booster circuit C丨, c2 ··capacitor 11........first boost type conversion D, 'd2··diode DCb US ···· DC busbar 12 ....... ...the first feedback circuit L, ' L2 ···Inductance 100 ···· ... boost converter system Ri ' r2 · · resistance 101 ----- ... current command S, ' s2 ···Power switch 102 ...· ...inductor current V, ·· ....... input voltage 103 ........ first control signal Vd.·....... relay voltage 2 .. ... ... second stage booster circuit V〇._ .......output voltage 21....... ...second boost type conversion 12