TW200414658A - Flyback converter with synchronous rectifier - Google Patents

Flyback converter with synchronous rectifier Download PDF

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Publication number
TW200414658A
TW200414658A TW092101095A TW92101095A TW200414658A TW 200414658 A TW200414658 A TW 200414658A TW 092101095 A TW092101095 A TW 092101095A TW 92101095 A TW92101095 A TW 92101095A TW 200414658 A TW200414658 A TW 200414658A
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Taiwan
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mentioned
voltage
winding
synchronous rectifier
patent application
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TW092101095A
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TW591869B (en
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Chang-Lung Kang
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Darfon Electronics Corp
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Priority to TW092101095A priority Critical patent/TW591869B/en
Priority to CNB03103179XA priority patent/CN1287510C/en
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Publication of TW200414658A publication Critical patent/TW200414658A/en

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

The present invention aims to provide a flyback converter with a synchronous rectifier. A sensing impedance is employed to sense a secondary current and convert the secondary current into a control voltage before transmitting the control voltage to a controller. Then, by comparing the control voltage with a reference voltage, a control signal is clipped to drive a synchronous rectifier switch. At the same time, the present invention also provides a protection circuit of the flyback converter. The representative diagram of the present invention is shown in Fig. 2 and the symbols representing elements shown in the representative diagrams are: 1. Flyback switching circuit, 2: First winding, 3: Second winding, 4: Inductive impedance, 5: Synchronous rectifier switch, 6: Controller, 7: Storage capacitor, 100: First ground potential, 101: Second ground potential, 102: Voltage-divider, Vsource: Power source voltage, Vsense: Control voltage, and 500: Load.

Description

200414658 五、發明說明（1) 【發明所屬之技術領域】 本發明係有關於一種反馳式轉換裝置，特別是一種有 關於具有同步整流器的反馳式轉換裝置。 【先前技術】 近年來，開關電源供應器（switching p〇wer SUppiy) 正在急速的發展，並且在電腦及電子產品裡扮演著極為重 要的角色。開關電源供應器和傳統式的電源供應器比較起 來，有著穩定、精簡、以及較有效率等優點。 嚤 在^當中，反驰式開關電源供應器因為有著較低成本 以及簡單化的電路設計而被廣泛的應用。並且，同步整流 的技術也被應用在反馳式轉換器上。第丨圖表示先前技術200414658 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a flyback conversion device, and more particularly to a flyback conversion device having a synchronous rectifier. [Previous technology] In recent years, switching power supplies (switching power supply) are rapidly developing, and have played a very important role in computers and electronic products. Compared with traditional power supplies, switching power supplies have the advantages of stability, simplicity, and efficiency.嚤 Among them, flyback switching power supply is widely used because of its lower cost and simplified circuit design. In addition, synchronous rectification technology is also applied to the flyback converter. Figure 丨 shows the prior art

H Pat. No· 6,353,544，為一具有同步整流器3〇〇的反 馳式轉換裝置。其中包含了一反馳式開關電路2〇〇，同步 整流器30 0，一電流變壓器4〇〇以及一負載5〇〇。此專利乃 是使用上述電流變壓器4〇〇去感應二次側電流，並且在二 次側電流終了時，提供一高頻脈波去關掉同步整流器的閘 極驅動（Gate Drive)。其主要技術特點為應用電流變壓器 而能達成其目的，但缺點為價格昂責。因此，為了降低成 本，本發明提出了一個更有效的解決方案。 【發明内容】 本發明之目的在於提供一 種具有同步整流器的反馳式H Pat. No. 6,353,544 is a flyback converter with a synchronous rectifier 300. It includes a flyback switching circuit 2000, a synchronous rectifier 300, a current transformer 400, and a load 500. This patent uses the above-mentioned current transformer 400 to sense the secondary-side current, and when the secondary-side current ends, it provides a high-frequency pulse to turn off the gate drive of the synchronous rectifier. Its main technical feature is the use of current transformers to achieve its purpose, but the disadvantage is the high price. Therefore, in order to reduce the cost, the present invention proposes a more effective solution. SUMMARY OF THE INVENTION The object of the present invention is to provide a flyback type with a synchronous rectifier.

200414658200414658

轉換裝置，利用一感應阻抗 成感應電壓，再將此控制電 考電壓與此控制電壓做比較 同步整流開關。而此轉換裝 出0 去感應二次側電流，將其轉換 壓送到一控制裝置，利用一參 ’切割出一控制信號去推動一 置之保護電路也同時在此提 為達成上述目的，本發明提出一種 反驰式轉換裝置及其保護電路，包括：有门/王抓沖的 一反馳式開關電路，耦接一電源Vs。。苴你田θ力 於輸出一高頻脈波電壓。 urce ’、 疋 壓器，其至少包括一第一繞組，第二繞一 中植上述反馳式開關電路輸出一高頻脈波並施力: 繞、组，使得上述第二繞組及第三繞組產生高頻 θ 一感應阻抗，耦接上述第二繞組之電流輸出。苴作用 是在於將上述高頻電流利用歐姆定律轉換為一控制^壓。 由於此感應阻抗可由一般電阻構成，因此本發明 低成本的方法。 一同步整流開關，耦接上述感應阻抗，用以控 脈波的開關。 一儲存電容器，其第一端耦接上述同步整流開關。 一控制裝置，耦接於上述控制電壓。其中，當上述控 制電壓大於或等於一參考電壓時，則上述控制裝置會輸^ 一控制信號將上述同步整流開關導通，使得上述高頻脈波 電流可以對上述儲存電容器進行充電；然而，當上述控制 2UU414658 五、發明說明（3) 上述參考電壓_，則輸出上述控制信號將上述同 步整流開關關閉。 & -及筮保護電路，包括一第-及第二二極體。《中上述第 mu & 一 =極體之負極與一第一電阻耦接，第一二極體之 、十，批^述第三繞組之第二端耦接，第二二極體之正極與 /二彳電路之輸出端耦接，而上述第一電阻與一第二地 μ ^ ^接。此保護電路可防止電壓的瞬間升高而導致電路 的块動作。 【實施方式】 實施例： 第2加圖係顯示本發明之具有同步整流器的反馳式轉換 裝置之架構圖。其中包括一反馳式開關電路1，耦接於一 ，源Vsource ’其作用是在於輸出一高頻脈波電壓。一變壓 器TR，至少包括一第一繞組2及第二繞組3。其中，上述反 馳^開關電路1輸出一高頻脈波並施加至上述第一繞組2， 使得上述第二繞組3產生高頻脈波電流。 、 本發明之主要特色為感應阻抗4，耦接上述第二繞組 之電流輸出。其作用是在於將上述高頻電流利用歐姆定 轉換為一控制電壓V 。 sense 一同步整流開關5，耦接上述感應阻抗4。一儲存電容The conversion device uses an inductive impedance to generate an inductive voltage, and then compares this control test voltage with this control voltage. A synchronous rectifier switch. And this conversion device is equipped with 0 to sense the secondary current, and the conversion voltage is sent to a control device. A reference signal is used to cut out a control signal to promote a protection circuit. The invention proposes a flyback conversion device and its protection circuit, which includes: a flyback switch circuit with a gate / wang grabbing, coupled to a power source Vs. . You field θ force to output a high-frequency pulse wave voltage. urce ', attenuator, which includes at least a first winding, a second winding and a middle fly-back switch circuit output a high-frequency pulse wave and apply force: winding, grouping, so that the above-mentioned second winding and third winding A high frequency θ-inductive impedance is generated, which is coupled to the current output of the second winding. The chirp function is to convert the above-mentioned high-frequency current into a control voltage by using Ohm's law. Since this inductive impedance can be composed of a general resistance, the method of the present invention is a low-cost method. A synchronous rectifier switch is coupled to the inductive impedance to control the pulse wave switch. A storage capacitor has a first terminal coupled to the synchronous rectifier switch. A control device is coupled to the control voltage. When the control voltage is greater than or equal to a reference voltage, the control device inputs a control signal to turn on the synchronous rectifier switch, so that the high-frequency pulse current can charge the storage capacitor; however, when the Control 2UU414658 5. Description of the invention (3) If the above reference voltage _, the above control signal is output to turn off the synchronous rectifier switch. &-A protection circuit including a first-and a second diode. "The above mu & one = the anode of the pole is coupled to a first resistor, the ten of the first diode is coupled to the second end of the third winding, and the anode of the second diode is positive It is coupled to the output terminal of the / II circuit, and the first resistor is connected to a second ground μ ^. This protection circuit prevents a momentary rise in voltage that could cause the circuit to block. [Embodiment] Embodiment: The second figure is a block diagram showing a flyback conversion device with a synchronous rectifier according to the present invention. It includes a flyback switch circuit 1 which is coupled to a source Vsource ′ whose function is to output a high-frequency pulse voltage. A transformer TR includes at least a first winding 2 and a second winding 3. The flyback switch circuit 1 outputs a high-frequency pulse wave and applies it to the first winding 2 so that the second winding 3 generates a high-frequency pulse current. The main feature of the present invention is the inductive impedance 4, which is coupled to the current output of the second winding. Its role is to convert the high-frequency current into a control voltage V by using Ohm. sense A synchronous rectifier switch 5 is coupled to the above-mentioned induced impedance 4. A storage capacitor

麵 Η ^35-9529T1VF(Nl);C92001；RQBERTLIU.ptd 第7頁 200414658 五、發明說明（4) 裔7，其第一端耦接上述同步整流開關5。以及，一 ' ^ Vsense，以控制上述同步整流開關5之動 作。其中，當上述控制電壓、_大於或等於一參考電壓 Γ門關上述控制裝置會輸出一控制信號將上述同步整 =二7進U吏得上述高頻脈波電流可以對上述儲存電 t 而’當上述控制電壓V—小於上述參 ΐ門出上述控制信號將域同步整流開關5 丄1 上述儲存電容器7之第二端耦接-第-地電 二:電 =阻抗與上述同步整流開關5之第-端接 =3圖係、冑示上述控制裝置6之細冑方塊圖， 二電阻9及第三電阻1〇 =裝置8/而分壓電路1 02由-第 成。分壓電路102可生成2裝置8則由一比較器11構 廠V ,, ,μ ^ 生成一參考電壓Vref，並與上述控制電 壓Vsense做比車父’便可切割出一和 步整流開關5。 控制㈣進而去推動上述同 再請參照第4圖，本圖係顯 之反驰式轉換裝置之可能電^不本/士 種同步整流 -感應阻抗12，而上述同步整^ J中上述感應阻抗4為 電議，其第-…:接:開上= 用以接收上述控制裝置6所輪屮夕沒應阻才几12，閘極 低的導通電阻’並且隨著科技的進：U體13擁有非常 义幻進步，此導通電阻值會不^ 35-9529T1VF (Nl); C92001; RQBERTLIU.ptd page 7 200414658 V. Description of the invention (4) The first end is coupled to the synchronous rectifier switch 5 described above. And, a Vsense is used to control the operation of the synchronous rectifier switch 5 described above. Among them, when the control voltage, _ is greater than or equal to a reference voltage, the gate is closed, the control device outputs a control signal to synchronize the synchronization = two, and the high-frequency pulse current can be used to store the electrical energy t. When the above-mentioned control voltage V is smaller than the above-mentioned reference gate and the above-mentioned control signal is output, the domain synchronous rectifier switch 5 丄 1 is coupled to the second terminal of the storage capacitor 7-the first-the ground power two: electricity = impedance and the first -Terminal connection = 3 is a detailed block diagram showing the above-mentioned control device 6, the second resistor 9 and the third resistor 10 = device 8 /, and the voltage dividing circuit 102 is made up of-. The voltage divider circuit 102 can generate 2 devices 8 and a comparator 11 constructs V ,,, μ ^ to generate a reference voltage Vref, and compares it with the above control voltage Vsense to drive the car's rectifier switch. 5. Control and further promote the above. Please refer to FIG. 4. This figure shows the possible electric current of the flyback conversion device. Synchronous rectification-inductive impedance 12 and the inductive impedance in the above-mentioned synchronous integration. 4 is a telegram, the first of which is -...: connected: open on = used to receive the above control device 6 and it should not be blocked for 12 seconds, the gate's low on-resistance 'and as technology advances: U body 13 Has very magical progress, this on-resistance value will not

ggQ535-9529TWF(Nl);C92001 ;ROBERTLIU.ptd 第8頁 200414658 五、發明說明（5) 斷的下降。因此，本發明^ 田^ ^ , 赞月了藉由金氧半場效電晶體13的使 用，進而降低功率的消耗。 便 ,、+. Π表示上述控制信號ν-之波形圖，其中VI為橫跨 =第一 f組2之電壓波形，V2為橫跨上述第二繞組3之； 开4形而跨上述感應阻抗4之控制電壓I之波 ’ 玉制佗號V〇ut則為上述控制裝置Θ之輸出波形。者 ，間在tl之刖，VI為高電位而V2為低電 Φ Λν /-k AW ΛΤ ^ ^ τ sense ^ 也變為高電位。隨著時間的增加，Vs的電壓值；；ggQ535-9529TWF (Nl); C92001; ROBERTLIU.ptd page 8 200414658 V. Description of the invention (5) Broken decline. Therefore, the invention ^ field ^ ^, praises the use of the gold-oxygen half field effect transistor 13, thereby reducing power consumption. Then, +. Π represents the waveform of the control signal ν-, where VI is the voltage waveform across the first f group 2 and V2 is across the second winding 3; The wave 4 of the control voltage I 'Jade No. Vout is the output waveform of the control device Θ described above. In the meantime, at t1, VI is high and V2 is low. Φ Λν / -k AW Λτ ^ τ τ sense ^ also becomes high. Over time, the voltage value of Vs;

V ，寸。ut也為低電位。當時間在剛過tl時，VI為低 電位而V2為^高電位，因此Vsense為高電位，使得控制信號- out w y ，， ，sense，王阻I又Ί又 ，彺下降，但是vsense的電壓值仍然保持比的電壓值要 间’使得控制指號7。以仍為高電位。當時間增加至七2時， 也就是在二次側電流結束（時間為13)之前，此時ν的 壓值等於Vref的電壓值”使得控制信號1^轉態成為^電位 而把上述金氧半場效電晶體丨3提前在二次側電流結束之前 關掉。當時間增加至t2以後，此時的電壓值小於Vref 的電壓值，使得控制信號V()ut持續在低電位。 第6圖係顯示本發明之具有同步整流器的反馳式轉換 裝置及其保護電路圖，其中上述變壓器1更具有一第三繞 組14。而上述第三繞組14耦接保護電路2〇。上述保護電路 20包括了 一第一及第二二極體（15、16)，其中上述第一及 第二二極體（15、16)之陰極與一第一電阻I?之第一端耦 接，第一 一極體15之陽極與上述第三繞組14之第二端搞 接，第二二極體16之陽極與上述控制電路丨丨之輸出端耦V, inch. ut is also low. When the time is just after tl, VI is low potential and V2 is high potential, so Vsense is high potential, which makes the control signal-out wy,,, sense, Wang resistance I again and again, 彺 decreases, but the voltage of vsense The value still remains longer than the voltage value 'makes the control number 7. Take it still high. When the time is increased to 7-2, that is, before the end of the secondary current (time is 13), the voltage value of ν at this time is equal to the voltage value of Vref. The half field effect transistor 3 is turned off before the end of the secondary current. When the time is increased to t2, the voltage value at this time is less than the voltage value of Vref, so that the control signal V () ut continues to be at a low potential. Figure 6 It is a flyback converter with a synchronous rectifier and a protection circuit diagram of the present invention. The transformer 1 further has a third winding 14. The third winding 14 is coupled to the protection circuit 20. The protection circuit 20 includes A first and second diode (15, 16), wherein the cathodes of the first and second diodes (15, 16) are coupled to a first end of a first resistor I? The anode of the body 15 is connected to the second end of the third winding 14, and the anode of the second diode 16 is coupled to the output terminal of the control circuit.

200414658 五、發明說明（6) 接’而上述 接。此保護 作。此外， 晶體1 9所構 出端及上述 以用來推動 第四電阻22 子接面電晶 雖然本 限定本創作 神和範圍内 護範圍當視 第一電 電路可 第一雙 成之推 金氧半 上述金 的作用 體1 8及 創作已 ，任何 ，仍可 後附之 阻1 7之 防止電 載子接 挽式輸 場效電 氧半場 則是在 第二雙 於較佳 熟習此 作些許 申請專 第二端 壓的瞬 面電晶 出級設 晶體13 效電晶 提供上 載子接 實施例 項技藝 的更動 利範圍 與一第 間升高 體18及 置於上 之間， 體13 〇 述控制 面電晶 揭露如 者，在 與潤飾 所界定 二地電 而導致 第二雙 述控制 其作用 而第三 電路11 體19所 上，然 不脫離 ’因此 者為準 位1 01耦 電路的誤動 載子接面電 電路11之輸 為緩衝器， 二極體21及 、第一雙載 需之電源。 其並非用以 本創作之精 本創作之保200414658 V. Description of the invention (6) Connected to the above. This protection works. In addition, the end of the crystal 19 and the above-mentioned transistor used to promote the fourth resistor 22 sub-junction. Although this definition limits the scope of this creation, the scope of protection should be considered as the first electrical circuit can push the first pair of metal oxygen. Half of the above-mentioned gold effect body 18 and the creation has been, any, can still be attached to the resistance of 17 to prevent electric carrier pull-type transfer field effect oxygen half field is in the second pair better familiar with this to make some applications The instantaneous surface crystal output stage dedicated to the second end pressure is provided with a 13-effect crystal to provide a carrier range for the modification of the technique of the embodiment and a first interposed elevated body 18 and placed on top. The body 13 controls The surface-electric crystal is exposed as described above. In the case of the two grounds defined by the retouching, the second dual-state control controls its function, while the third circuit 11 and 19 are not separated from each other. The output of the carrier interface circuit 11 is a buffer, and the diode 21 and the first double carrier need a power source. It is not a guarantee of the essence of the creation.

200414658 圖式簡單說明 第1圖係顯示習知技術之一種同步整流之反馳式轉換 裝置。 第2圖係顯示本發明之一種同步整流之反馳式轉換裝 置。 第3圖係顯示控制裝置之細部方塊圖。 第4圖係顯示本發明之一種同步整流之反馳式轉換裝 置之完整電路圖。 第5圖係顯示本發明之電壓波形圖。 # 第6圖係顯示本發明之具有同步整流器的反驰式轉換 裝置及其保護電路圖。 符號說明 卜反驰式開關電路 2〜第一繞組 3〜第二繞組 4〜感應阻抗 5〜同步整流開關 6〜控制裝置 7〜儲存電容器 8〜比較裝置 9〜第二電阻 1 0〜第三電阻200414658 Brief description of the diagram Figure 1 shows a synchronous rectification flyback converter of the conventional technology. Fig. 2 shows a synchronous rectification flyback converter according to the present invention. Figure 3 is a detailed block diagram showing the control device. Fig. 4 is a complete circuit diagram showing a synchronous rectification flyback converter of the present invention. Fig. 5 is a diagram showing a voltage waveform of the present invention. # FIG. 6 is a diagram showing a flyback converter with a synchronous rectifier and a protection circuit according to the present invention. Explanation of symbols: Flyback switch circuit 2 ~ first winding 3 ~ second winding 4 ~ inductive impedance 5 ~ synchronous rectifier switch 6 ~ control device 7 ~ storage capacitor 8 ~ comparative device 9 ~ second resistor 1 0 ~ third resistor

0535-9529TWF(Nl) ;C92001 ;ROBERTLIU.ptd 第11頁 200414658 圖式簡單說明 1 1〜比較器 1 2〜感應阻抗 1 3〜金氧半場效電晶體 1 4〜第三繞組 1 5〜第一二極體 1 6〜第二二極體 1 7〜第一電阻 18〜第一雙載子接面電晶體 19〜第二雙載子接面電晶體 2 0〜保護電路 21〜第三二極體 2 2〜第四電阻0535-9529TWF (Nl); C92001; ROBERTLIU.ptd Page 11 200414658 Brief description of the diagram 1 1 ~ Comparer 1 2 ~ Inductive impedance 1 3 ~ Metal Oxide Field Effect Transistor 1 4 ~ Third Winding 1 5 ~ First Diode 1 6 ~ Second Diode 1 7 ~ First Resistor 18 ~ First Bipolar Junction Transistor 19 ~ Second Bipolar Junction Transistor 2 0 ~ Protection Circuit 21 ~ Third Diode Body 2 2 to 4th resistor

102 200 300 400 500 V source 1 0 0〜第一地電位 1 0 1〜第二地電位 分壓電路 反驰式開關電路 同步整流器 電流變壓器 負載 〜電源 vsense〜控制電壓 ^ef〜參考電壓 V 1〜橫跨上述第一繞組2之電壓波形 V2〜橫跨上述第二繞組3之電壓波形102 200 300 400 500 V source 1 0 0 ~ first ground potential 1 0 1 ~ second ground potential voltage divider circuit flyback switch circuit synchronous rectifier current transformer load ~ power supply vsense ~ control voltage ^ ef ~ reference voltage V 1 ~ Voltage waveform V2 across the first winding 2 ~ Voltage waveform across the second winding 3

0535-9529TWF(Nl);C92001;ROBERTLIU.ptd 第12頁 200414658 圖式簡單說明 〜為上述控制裝置6之輸出波形 第13頁 0535-9529TWF(Nl) ;C92001 ;ROBERTLIU.ptd0535-9529TWF (Nl); C92001; ROBERTLIU.ptd Page 12 200414658 Simple explanation of the drawing ~ is the output waveform of the above control device 6 Page 13 0535-9529TWF (Nl); C92001; ROBERTLIU.ptd

Claims (1)

200414658 六、申請專利範圍 -種同步整流之反馳式轉換裝置，包括： 反馳式開關電路，耦接一電源用以輸出一高頻脈波 良壓盗，至少包括一第一繞組及第二繞組；其中， ^述尚頻脈波施加至上述第一繞組，使得上述第二繞組產 生—高頻脈波電流； 上、f - ί f’耦接上述第二繞組之電流輸出，用以將 上迹南頻電流轉換為一控制電壓； 二同=整流開關，麵接上述感應阻抗； 及一儲存電容器，其第—端搞接上述同步整流開關；以 徑剌裝置 —^ m w丄处衩制電壓· 輸出=制：大於或等於-參考電壓時，1 脈波電流得。述儲存Ξ 開關導通’使得上述高; 小於上述參考電壓時，則；充電；當上述控㈣ 流開關關閉。 、輸出上述控制信號將上述同步j 2 ·如申請專利範圍第1項所 馳式轉換裝置，其中，上述控a之具有同步整流器的反 -分壓電路’用以生成：述: -比較裝置’用於比較上述拎3:f，以& 壓。 k控制電壓及上述參考電 i如申請專利範圍第2項 馳式轉換裝置，其中，上述分厂之具有同步整流器的 刀蹙電路係由電阻所構成c200414658 6. Scope of Patent Application-A synchronous flyback flyback converter, including: a flyback switch circuit, coupled to a power supply to output a high-frequency pulsed good voltage thief, including at least a first winding and a second Winding; wherein, the frequency pulse is applied to the first winding, so that the second winding generates a high-frequency pulse current; and f-f 'is coupled to the current output of the second winding to The upper frequency of the south frequency current is converted into a control voltage; two identical = a rectifier switch, which is connected to the above-mentioned inductive impedance; and a storage capacitor, whose first terminal is connected to the synchronous rectifier switch; Voltage · Output = Control: When it is greater than or equal to-the reference voltage, 1 pulse current is obtained. The storage Ξ switch is turned on to make the above high; when it is less than the above reference voltage, then; charging; when the above-mentioned current control switch is turned off. The output of the above control signal will synchronize the above-mentioned synchronous j 2 · As described in the first patent application scope, a conversion device, wherein the above-mentioned control-a anti-dividing circuit with a synchronous rectifier is used to generate: 'For comparison of 拎 3: f above, press &. k Control voltage and the above reference voltage i As in the scope of the patent application No. 2 Chi-type conversion device, in which the knife 蹙 circuit with a synchronous rectifier in the above branch is composed of a resistor c 200414658 六、申請專利範圍 ^如申請專利範圍第2項所述之具 ^^s ^ „tb4Λ；^ 5·如申請專利範圍第1項所述之具有同步整法时成。 驰式輳拖驴罢 ^ J，整机裔的反 〇 ' 2 ，，、中上述感應阻抗係由電阻所構成。 b.如申請專利範圍第丨項所述之具有同 奐ΐΓ ΐ/中上述同步整流開關係為-：氧。半場〜 ΐ::;::信號，而第二源/汲極為上父具 L益的反馳式轉換裝置之輸出端。 登 7·如申印專利範圍第6項所述之具有同步整流 地inu:上述儲存電容器之第二端耦接-第-源/㈣接於述一感第應二阻地抗電^ 8·種具有同步整流器的反馳式轉換裝置，包括· ㈣m㈣電路，^接—電源用以輸出—高頻脈波 一變壓器，至少包括一第一繞組，第二繞组及 組；其中，上述高頻脈波施加至 ”，二％ 第二繞組產生一高頻脈波電流；过第％組’使传上述 一感應阻抗，耦接上述第二繞組之電流輸出， 上述高頻電流轉換為一控制電虔； 乂將 一同步整流開關，耦接上述感應阻抗； 一儲存電容器，其第一她紅社[、丄、 -控制裝置，接上述：Πΐ迷同步整流開關’· 2UU414658 六、申請專利範圍 檢出1二制二j =控制電壓大於或等於一參考電壓時，則 财:波電：得；：述以！整流開關導通丄使得上述高頻 小於上述參考電Π:器進行充電；當上述控制電壓 流開關關閉；以及’輪出上述控制信號將上述同步整 -及第:、蔓包括—第-及第二二極體’ ▲中上述第 二ϋ??極與—第-電阻之第-端耗接，第- 上述第三繞組之第二端耦接，第二二極體 第二端與上述第出端耦接，而上述第-電阻之 述同步整流開第二端耦接至上述感應阻抗與上 驰式9轉：Π專述之具有同步整流器的反 丹τ上述控制電路包括： 一刀f電路，用以生成一參考電壓；以及 電壓。比車父裝s，用於比較上述第-控制電壓及上述參考 馳式裝申/，專:中， 、 置 /、中上述分壓電路係由電阻所構成。 馳式丄換如裝申/Λ利中範Η圍第8項所述之具有同步整流器的反 、、 八中上述比較裝置係由比較器所構成。 馳式轉換V:專二範圍第8項所述之具有同步整流器的反 、裝置’其中上述阻抗元件係由電阻所構成。 如申請專利範圍第12項所述之具有同步整流器的 ^ 換裝置’其中上述儲存電容器之第二端耦接一第200414658 VI. Scope of patent application ^^ s ^ tb4Λ as described in item 2 of the scope of patent application ^ 5 · Contemporary integration as described in item 1 of the scope of patent application. ^ J, the inverse impedance of the whole machine is 2 ', and the above-mentioned inductive impedance is composed of resistance. B. As described in item 丨 of the patent application, it has the same 整流 Γ 整流 / the above-mentioned synchronous rectification open relationship is -: Oxygen. Half-time ~ ΐ ::; :: signal, and the second source / drain is the output terminal of the flyback converter with L benefit from the father. Deng 7. As described in item 6 of the scope of patent application With synchronous rectification ground inu: the second end of the above storage capacitor is coupled-the first-source / ㈣ is connected to the first sense, the second resistance and the second resistance of the ground ^ 8 · Flyback conversion device with synchronous rectifier, including · ㈣m㈣ A circuit, which is connected to a power source to output a high-frequency pulse wave. A transformer includes at least a first winding, a second winding, and a group. Among them, the above-mentioned high-frequency pulse wave is applied to "2%. The second winding generates a high voltage. Frequency pulse wave current; passing through the% group 'causes the above-mentioned induced impedance to be coupled to the above-mentioned second winding Current output, the above-mentioned high-frequency current is converted into a control signal; 乂 a synchronous rectifier switch is coupled to the above-mentioned inductive impedance; a storage capacitor, the first of which is a red society [, 丄,-control device, connected to the above: Πΐ 迷Synchronous rectifier switch '· 2UU414658 6. The scope of patent application detected 1 two systems and two j = when the control voltage is greater than or equal to a reference voltage, then: The rectifier switch is turned on so that the high frequency is smaller than the reference voltage and the device is charged; when the control voltage flow switch is turned off; and 'the control signal is turned out to synchronize the above-mentioned and the first, the first, the second, and the second. The second pole of the diode ▲ is connected to the first terminal of the -th resistor, the second terminal of the third winding is coupled, and the second terminal of the second diode is connected to the first terminal. The above-mentioned first resistor is synchronously rectified, and the second terminal is coupled to the above-mentioned inductive impedance and the 9-turn type: the anti-dan τ with synchronous rectifier described above includes the following control circuit: Used to generate a reference voltage; and voltage. Than the car-mounted device, it is used to compare the above-mentioned control voltage and the above-mentioned reference type. Special, medium,, and /, and the above-mentioned voltage dividing circuit is composed of resistors. The above-mentioned comparison device with a synchronous rectifier as described in item 8 of the installation method / 中 利 中 范 Η 围 item 8 is composed of a comparator. Flyback conversion V: An inverter device with a synchronous rectifier as described in item 8 of the second range, wherein the impedance element is composed of a resistor. The switching device with a synchronous rectifier according to item 12 of the scope of patent application, wherein the second end of the storage capacitor is coupled to a first ?.5?1'9529TWF(N1)；C92001 iROBERTI τπ 第16頁 200414658 六、申請專利範圍 一地電位，而上述第三繞組之第二端、上述感應阻抗與上 述同步整流開關之連接點耦接於一第二地電位。 1 4.如申請專利範圍第1 3項所述之具有同步整流器的 反驰式轉換裝置，其中上述同步整流開關係為一金氧半場 效電晶體。? .5? 1'9529TWF (N1); C92001 iROBERTI τπ page 16 200414658 6. The scope of patent application is a ground potential, and the second end of the third winding, the above-mentioned inductive impedance and the connection point of the synchronous rectifier switch are coupled. At a second ground potential. 1 4. The flyback conversion device with a synchronous rectifier as described in item 13 of the scope of the patent application, wherein the synchronous rectification on-off relationship is a metal-oxygen half field-effect transistor. 0535-9529TWF(Nl);C92001;ROBERTLIU.ptd 第 17 頁 Λ .►•"ν Λ0535-9529TWF (Nl); C92001; ROBERTLIU.ptd page 17 Λ .► • " ν Λ
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TWI622257B (en) * 2017-07-05 2018-04-21 力林科技股份有限公司 Power conversion apparatus and synchronous rectification circuit thereof

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KR100568319B1 (en) * 2004-10-22 2006-04-05 삼성전기주식회사 Flyback converter with synchronous rectifier
CN101888171B (en) * 2009-05-15 2012-11-28 洋鑫科技股份有限公司 No bridge type power factor corrector with logical control
CN102761237A (en) * 2011-04-26 2012-10-31 江苏兆能电子有限公司 Shutdown scheme for synchronous rectifier DC-DC (Direct Current) converter
CN102437725A (en) * 2011-12-21 2012-05-02 华为技术有限公司 Self-driven synchronous rectification power supply and switching-off method thereof
CN103368423B (en) * 2013-06-24 2015-07-15 冠捷显示科技（厦门）有限公司 Flyback synchronous rectifying circuit controlled by operational amplifier or comparator and flyback power supply thereof
CN108155817A (en) * 2016-12-02 2018-06-12 中惠创智（深圳）无线供电技术有限公司 A kind of synchronous rectification switch, circuit and chip
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI622257B (en) * 2017-07-05 2018-04-21 力林科技股份有限公司 Power conversion apparatus and synchronous rectification circuit thereof

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