M416271 五、新型說明： 【新型所屬之技術領域】 本新型涉及電路領域，更具體地涉及返触結構的開關電源電路。 【先前技術】 減碳，社會面臨能源消耗過大、環境破壞嚴重的壓力，節能 ί彳^ 備及電子產品為降低能源消耗，必須對其《轉換 更高的轉換效率和更麵靜態待機雜。在中小功率 ^社Ϊ聽湖為成本健、設計簡單被普遍採用。目前市面上使用的 的開關„電路哺換效率、賴雜等 【新型内容】 本新型提出了一種新型的返馳結構的開關電源電路。 号和職路包較流魏輸入整流 返馳m電路、輸出舰電路、_取樣電路、 控制電路、以及供電祕。其中’交流電源輸人錢器和電針擾遽波電 入端與交流獅相連接，輸出端與·關電關輸人端和控制電 相連接，·返驰開關電路的輸入端與交流電源輸人整流器和《 =波電路的輸出端和測電路的輸_目連接，輸㈣與輸出遽波 入端、控制電路的輸人端、以及供電電路的輸人端相連接；爾 1路的輸人端與返關關電路的輸出端相連接，輸㈣與回饋取樣 ^ D入iM目連接，回饋取樣電路的輸人端與輸出滤波電路的輸出端相 接’輸η出端與控制電路的輸入端相連接；控制電路的輪入端與交流 電 輸出濾 電路 連 電源輸 回饋取 ^磁干麟波電㈣細端、秘關電料_端、明取的ίΠΪΓ錢供U料輸姆_，輸㈣與猶電路接，輸電1 的輸人端與返馳_路_端相連 饮彌出鈿與控制電路的輸入端相連接。 3 M416271 根據本新型實施例的返驰結構的開關電源電路具備待機功耗低、效率 高、啟動時間短、電磁干擾（EMI)低等特點，並能符合各種安全規範。 【實施方式】 下面將詳細描述本新型各個方面的特徵和示例性實施例。下面的描述 涵蓋了許多具體細節，以便提供對本新型的全面理解。但是，對於熟之該 項技術領域之人來說顯而易見的是，本新型可以在不需要這些具體細節中 的一些細節的情況下實施。下面對實施例的描述僅僅是為了通過示出本新 ' 型的示例來提供對本新型更清楚的理解。本新型絕不限於下面所提出的任 _ 何具體配置’而是在不脫離本新型的精神的前提下覆蓋了相關元素或部件 的任何修改、替換和改進。 圖1不出了根據本新型實施例的返馳機構的開關電源電路的電路圖。 如圖1所示，根據本新型實施例的返馳機構的開關電源電路包括交流電源 (AC)輸入整流和電磁干擾（EM!)渡波電路卜返馳開關電路2、輸出渡 波電路3、回饋取樣電路4、控制電路5、供電電路6、過沖吸收電路7、= 及驅動電路8。 在圖1所示的實施例中，AC輸入整流和EMU慮波電路】包括保險絲 (FUSE)、兩級共模濾波電感、X電容、又放電電阻、變阻器、以及整 橋輸出濾波電容。 籲在圖1所示的實施例中’返桃開關電路2包括返驰變壓器T、開關金屬 氧化層半導體場效電晶體（MOSFET)、以縣電緋樣電阻。 在圖1所示的實施例中，輸出濾波電路3包括輸出整流二極體、和減 波電容兩個主要部分。整流二極體上並有RC吸收電路。RC吸收電路相 根據需要而調整，也可以·。針對不同的輸出紋波要求，輸出濾波電路 可以增加;r型濾波電路或者共模濾波電路。 在圖1所示的實施例中’回饋取樣電路4由並聯穩壓積體電路 (TL431)、光耗、以及回饋電阻和電容構成，用於對返馳結構的開關電源 電路的輸出電壓進行採樣，通過TL431對採樣電壓進行調節並將調節後的 採樣電壓回綱控制電路5中的控制晶片中，進而調節返馳開關電路2中 開關管的工作週期。 4 M416271 在圖1所示的實施例中’控制電路5的主要器件是一顆脈寬調制 (PWM)控制晶片及必要的週邊輔助元件，比如〇B5269或類似功能的控 制晶片。該控制晶片（1C)總共包含8只功能接腳，分別是： 驅動接腳（GATE):用於控制返馳開關電路2中開關管的導通或者關 閉’與驅動電路8的輸入端相連接； 輸出回饋接腳（FB):用於檢測返驰結構的開關電源電路的輸出電壓， 與回饋取樣電路4中的光輕相連接（即，與回饋取樣電路4的輸出端相連 接）； 系統保護接腳（RT):用於該控制晶片中的系統超溫保護或輸入超壓/ 欠壓保護’經由熱敏器件（OTP)接地； 供電輸入接腳（VDD):用於為該控制晶片供電，與供電電路6的輸出 端相連接； 電流採樣接腳（CS):用於對返驰開關電路2中的變壓器的原電流進行 採樣’與返馳開關電路2的輸出端相連接； 间壓啟動接腳（HV):用於該控制晶片的高壓啟動，與AC輸入整流和 EMI濾波電路〗的輸出端相連接； ^曰片接地接腳（GND):用於與該控制晶片的參考接地相連接； 尚壓隔離接腳（NV):用於該控制晶片的高壓啟動接腳和供電輸入接 腳之間的隔離，外部空放，也可以沒有這個接腳。 其中’系統保護接腳RT通過串聯連接的負溫度係數熱敏器件（NTC) 和電阻R來細控制晶片巾的系統溫度，並且在系統溫度過高時關閉驅動 接腳GATE ’從而使得返馳結構的開關電源電路的輸出被酬。圖2示出了 NTC^R的多種連接方式（其中，R可以根據需要被省略掉）。 回饋，樣電路4中的光麵回饋的電壓採樣信號經由輸出回饋接腳FB輸 入2，制BB片巾。職開關電路2巾的原電流取樣電阻獲取的電流採 樣L號通過RC^慮波後經由電流採樣接腳cs輸入到控制晶片中 。經由輸出 =，曰腳B和電流採樣接腳cs輪人的電麟樣信號和電流採樣信號通過 玉日日曰片的内。ρ運鼻產生脈寬調制（pwM)輸出。冑壓啟動接腳爪通過 控制晶片内部的X放電電阻給晶片供電電容充電 ，也可以通過整流電橋後 5 M416271 • 濾波電容給控制晶片供電。圖3至圖5示出了高壓啟動接腳與^輸入整节 和EMI濾波電路1的多種連接方式。 _ 系統保護接腳RT可以既用於控制晶片的系統超溫保護，又用於供電輸 入接腳VDD的保護。也就是說，系統保護接腳RT可以偵測供電輸二接腳 VDD上的電壓是否過高，並且在供電輸入接腳vdd上的電壓過高的情況 下，關閉供電輸入接腳VDD。圖6和圖7示出了系統保護接腳既用於^統 超溫保護又用於供電輸入接腳VDD的保護的情況下的兩種電路連接方式。 過沖吸收電路7連接在返驰開關電路2中的A和B兩點之間。驅^電 路8連接在控制電路5和返馳開關電路2之間。供電電路6連接在控制電 φ 路5和返馳開關電路2之間。更具體地，驅動電路8連接在控制電中 的控制晶片的驅動接腳和返馳開關電路2中的開關管之間（即，連接在圖i 中的C點和D點之間 >供電電路6連接在控制電路5中的供電輸入接^和 返馳開關電路2中的回饋繞組之間（即，連接在圖】中的G點和H點之間 圖8示出了吸收電路在a、b兩點之間的多種接法。圖9示出了驅動 電路在C、D兩點之間的多種接法。圖1〇示出了供電電路在G、H兩點之 間的多種接法。 根據本新型的返驰結構的開關電源電路具備待機功耗低、效率高、啟 動時間短、ΕΜΙ輻射低等特點，並能符合各種安規標準。 以上已經參考本新型的具體實施例來描述了本新型，但是熟之該項技 __域之人均瞭解，可讀這些具體實施舰行各讎改、組合和變更， 而不會脫_所㈣請專利顧或其等_限定的本新_精神和範圍。 此外，附圖中的任何信號箭頭應當被認為僅是示例性的，而不是限制性的， 除非另有具體指示。當術語被預見為使分離或組合的能力不清楚時，元件 或者步驟的組合也將被認為是已經記載了。 【圖式簡單說明】 從下面結合附圖對本新型的具體實施方式的描述中可以更好地理解 本新型，其中： 圖1示出了根據本新型的實施例的返聽機構的開關電源電路的電路 圖； 6 M416271 圖2示出了負溫度係數熱敏器件NTC和電阻R的多種連接方式. 多種連接方式 圖3至圖5示出了高壓啟動接腳與八〇輸入整流和£他濾波電略^的 圖6和圖7示出了系統保護接腳既用於系統超溫保護又用於供 接腳VDD的保護的情況下的兩種電路連接方式； 、’、包輸入 圖8示出了圖1中A、B兩點之間的吸收電路的多種接法. 圖9示出了圖1中c、D兩點之間的驅動電路的夕 ， 圖10示出了圖1中G、Η兩點之間的供電電路的^接法；以及 【主要元件符號說明】 1 電磁干擾（ΕΜΙ)濾波電路 2 返馳開關電路 3 輸出濾波電路 4 回饋取樣電路 5 控制電路 6 供電電路 7 過沖吸收電路 8 驅動電路M416271 V. New description: [New technical field] The present invention relates to the field of circuits, and more particularly to a switching power supply circuit of a return contact structure. [Prior Art] Carbon reduction, the society is facing the pressure of excessive energy consumption and serious environmental damage. Energy-saving and electronic products must reduce their conversion efficiency and make them more stable. In the small and medium power, the community is widely used for cost-effective and simple design. At present, the switch used in the market is “circuit feeding efficiency, reliance, etc.” [New content] This new model proposes a new type of switching power supply circuit for the flyback structure. The number and the service package are compared with the flow input and rectifier reciprocating m circuit. Output ship circuit, _sampling circuit, control circuit, and power supply secret. Among them, 'AC power input device and electric pin turbulence wave input terminal are connected with AC lion, output terminal and · power off and input terminal and control Electrical phase connection, the input end of the flyback switch circuit and the AC power input rectifier and the output of the = wave circuit and the input circuit of the measuring circuit, the input (four) and the output chopping end, the input end of the control circuit And the input end of the power supply circuit is connected; the input end of the 1st channel is connected with the output end of the returning off circuit, the input (4) is connected with the feedback sampling ^ D into the iM mesh, and the input end and output of the sampling circuit are fed back. The output end of the filter circuit is connected to the input end of the control circuit and the input end of the control circuit; the turn-in end of the control circuit and the AC output filter circuit are connected to the power supply and return to the feed; the magnetic dry lining wave (four) thin end, secret power Material_end, Ming The money is for the U material to lose the _, the input (four) and the Jude circuit, the transmission end of the transmission 1 and the return to the _ road _ end connected to the drinking 弥 and the input end of the control circuit. 3 M416271 According to the new implementation The switching power supply circuit of the return structure has the characteristics of low standby power consumption, high efficiency, short startup time, low electromagnetic interference (EMI), and can meet various safety specifications. [Embodiment] Various aspects of the present invention will be described in detail below. Features and exemplary embodiments. The following description covers many specific details in order to provide a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may not require The details of the details are implemented in the following. The description of the embodiments is merely intended to provide a clearer understanding of the present invention by showing an example of the present invention. The present invention is in no way limited to the following. The specific configuration 'is to cover any modification, replacement and improvement of related elements or components without departing from the spirit of the novel. The circuit diagram of the switching power supply circuit of the flyback mechanism of the new embodiment. As shown in FIG. 1, the switching power supply circuit of the flyback mechanism according to the embodiment of the present invention includes an alternating current power supply (AC) input rectification and electromagnetic interference (EM!) Circuit return switch circuit 2, output wave circuit 3, feedback sampling circuit 4, control circuit 5, power supply circuit 6, overshoot absorption circuit 7, = and drive circuit 8. In the embodiment shown in Figure 1, AC input Rectifier and EMU wave circuit] includes fuse (FUSE), two-stage common mode filter inductor, X capacitor, discharge resistor, varistor, and full bridge output filter capacitor. Call the 'return switch' in the embodiment shown in Figure 1. The circuit 2 includes a flyback transformer T, a switch metal oxide semiconductor field effect transistor (MOSFET), and a county-like resistor. In the embodiment shown in FIG. 1, the output filter circuit 3 includes an output rectifier diode, and The two main parts of the wave-reducing capacitor. There is an RC absorbing circuit on the rectifier diode. The RC snubber circuit can be adjusted as needed. For different output ripple requirements, the output filter circuit can be added; r-type filter circuit or common mode filter circuit. In the embodiment shown in FIG. 1, the feedback sampling circuit 4 is composed of a shunt regulated integrated circuit (TL431), a light consumption, and a feedback resistor and a capacitor for sampling the output voltage of the switching power supply circuit of the flyback structure. The sampling voltage is adjusted by the TL431 and the adjusted sampling voltage is returned to the control wafer in the control circuit 5, thereby adjusting the duty cycle of the switching transistor in the flyback switching circuit 2. 4 M416271 In the embodiment shown in Figure 1, the main component of control circuit 5 is a pulse width modulation (PWM) control chip and the necessary peripheral auxiliary components, such as 〇B5269 or similarly functioning control wafer. The control chip (1C) comprises a total of eight function pins, respectively: a drive pin (GATE): for controlling the conduction or closing of the switch tube in the flyback switch circuit 2 to be connected to the input end of the drive circuit 8; Output feedback pin (FB): the output voltage of the switching power supply circuit for detecting the flyback structure is lightly connected to the light in the feedback sampling circuit 4 (ie, connected to the output of the feedback sampling circuit 4); Pin (RT): for system over temperature protection or input overvoltage/undervoltage protection in the control chip 'ground via thermal device (OTP); power input pin (VDD): used to power the control chip Connected to the output of the power supply circuit 6; current sampling pin (CS): used to sample the original current of the transformer in the flyback switch circuit 2 'connected to the output of the flyback switch circuit 2; Start pin (HV): for high-voltage start-up of the control chip, connected to the output of the AC input rectification and EMI filter circuit; ^ 曰 chip ground pin (GND): for reference grounding with the control chip Connected; still pressure isolation pin (NV): The isolation between the high-voltage start pin and the power input pin of the control chip is externally placed, and the pin may not be provided. The 'system protection pin RT' controls the system temperature of the wafer towel through the negative temperature coefficient thermal device (NTC) and the resistor R connected in series, and turns off the driving pin GATE ' when the system temperature is too high, thereby making the flyback structure The output of the switching power supply circuit is paid. Figure 2 shows the various connections of NTC^R (where R can be omitted as needed). The feedback, the voltage sampling signal of the smooth surface feedback in the sample circuit 4 is input to the FB piece via the output feedback pin FB. The current sample L obtained by the original current sampling resistor of the service switch circuit 2 is input to the control chip via the current sampling pin cs through the RC^ wave. Through the output =, the foot B and the current sampling pin cs round the person's electric signal and the current sampling signal through the inside of the jade. The ρ nose produces a pulse width modulation (pwM) output. The rolling start pin charges the chip supply capacitor by controlling the X discharge resistor inside the wafer, and can also supply power to the control chip through the rectifier bridge 5 M416271 • filter capacitor. 3 to 5 show various connections of the high voltage start pin and the input full section and EMI filter circuit 1. _ The system protection pin RT can be used to control both the system over temperature protection of the chip and the power supply input pin VDD. That is to say, the system protection pin RT can detect whether the voltage on the power supply and output pin VDD is too high, and if the voltage on the power supply input pin vdd is too high, the power supply input pin VDD is turned off. 6 and 7 show two circuit connections in the case where the system protection pin is used for both the over temperature protection and the protection of the power supply input pin VDD. The overshoot absorbing circuit 7 is connected between the two points A and B in the flyback switch circuit 2. The drive circuit 8 is connected between the control circuit 5 and the flyback switch circuit 2. The power supply circuit 6 is connected between the control circuit 5 and the flyback switch circuit 2. More specifically, the drive circuit 8 is connected between the drive pin of the control chip in the control circuit and the switch tube in the flyback switch circuit 2 (ie, connected between point C and point D in FIG. The circuit 6 is connected between the power supply input terminal in the control circuit 5 and the feedback winding in the flyback switch circuit 2 (i.e., connected between points G and H in the figure). Figure 8 shows the absorption circuit at a. There are various connections between the two points of b. Figure 9 shows the various connections between the two points of the drive circuit at C and D. Figure 1 shows the multiple connections between the two points G and H of the power supply circuit. The switching power supply circuit according to the flyback structure of the present invention has the characteristics of low standby power consumption, high efficiency, short starting time, low enthalpy radiation, and can meet various safety standards. The above has been described with reference to the specific embodiments of the present invention. This new type, but familiar with the technology __ domain people understand, read these specific implementation of the ship's various tampering, combination and change, and will not take off _ (4) please patent Gu or its _ limited new _ Spirit and scope. In addition, any signal arrow in the drawing should be considered as only The use of the elements or combinations of steps is also considered to have been described in the context of the singularity of the elements. The present invention can be better understood from the following description of the specific embodiments of the present invention in conjunction with the accompanying drawings in which: FIG. 1 is a circuit diagram of a switching power supply circuit of a returning mechanism according to an embodiment of the present invention; 6 M416271 2 shows a variety of connection methods of the negative temperature coefficient thermal device NTC and the resistor R. A variety of connection modes Figure 3 to Figure 5 shows the high voltage start pin and the gossip input rectification and the other filter Figure 6 and FIG. 7 shows two circuit connection modes in the case where the system protection pin is used for both system over-temperature protection and pin VDD protection; ', package input FIG. 8 shows A in FIG. A plurality of connections of the absorbing circuit between the two points. Fig. 9 shows the driving circuit between the two points c and D in Fig. 1, and Fig. 10 shows the difference between the two points G and 图 in Fig. 1. The connection method of the power supply circuit; and [the main component symbol 1] electromagnetic interference (ΕΜΙ) filter circuit 2 flyback switching circuit 3 outputs sampling filter circuit 4 feedback circuit power supply circuit control circuit 6 5 7 8 overshoot driving absorbing circuit