【導(dǎo)讀】circuitwiring.

　　

【正文】 circuit, similar to the pulsating direct current sensor. Part of the magic coupling through the air gap. Why I understand the principle of open air gap as follows: As the power ferrite also has a similar rectangle of the operating characteristics (hysteresis loop), operating characteristics curve in the Yaxis magic induction (B), now the general production process saturation point in 400mT above, the general value in the design of this value should be more appropriate in the 200300mT, Xaxis magic field strength (H) the value of current intensity is proportional to the magization. Open magic circuit air gap equal to the magic hysteresis loop to the X axis tilt, in the same magic induction intensity, can withstand a greater magizing current, equivalent to core store more energy, this energy cutoff switch When spilled into the load through the transformer secondary circuit, flyback power core to open the air gap is twofold. One is to transfer more energy, and the second to prevent the core into saturation. Flyback Power Transformer magization state in one way, not only to pass through the magic coupling energy, is also responsible for input and output isolation voltage transform multiple roles. Therefore, the treatment gap need to be very careful, the air gap leakage inductance can bee too large, increase the hysteresis loss, iron loss, copper loss increases, affecting the power of the whole performance. Air gap is too small has the potential to transformer core saturation, resulting in damage to power The socalled flyback power supply is continuous and discontinuous mode transformer working conditions, working in full load condition in the power transformer plete transfer, or inplete transmission mode. General design of the working environment, conventional flyback power supply should work in continuous mode, this switch, circuit loss are relatively small, and can reduce the stress of work input and output capacitors, but that there are some exceptions. Requires in particular that: As the characteristics of the flyback power supply is also more suitable for design into a highvoltage power supply, and highvoltage power transformers generally work in discontinuous mode, I understand the need for as high voltage power supply output voltage of the rectifier diodes. Because of the manufacturing process characteristics, hightension diode, reverse recovery time is long, low speed, the current continuous state, the diode has a positive bias in the recovery, reverse recovery energy loss is very large, is not conducive to converter performance increase, ranging from reduced conversion efficiency, rectifiers, severe fever, weight is even burnt rectifier. As in the intermittent mode, the diode is reverse biased under zero bias, loss can be reduced to a relatively low level. Therefore, high voltage power supply work in discontinuous mode, and the frequency can not be too high. Another type of flyback power supply work in the critical state, the general type of power supply work in FM, or FMwidthmodulated dualmode, a number of lowcost selfexcitation power (RCC) is often used this form in order to ensure stable output transformer As the operating frequency, output current or input voltage change, close to the fully loaded transformer is always maintained at between continuous and intermittent, this power is only suitable for small power output, otherwise the handling characteristics of electromagic patibility will be a headache Flyback switching power supply transformer should work in continuous mode, it required relatively large winding inductance, of course, is to some extent continuous, excessive pursuit of absolute continuity is not realistic, may need a great core, very much coil turns, acpanied by a large leakage inductance and distributed capacitance, worth the trouble. So how does this parameter to determine, through repeated practice, and analysis of peer design, I think, in the nominal voltage input, the output reached 50% and 60% transformer from intermittent, continuous state of transition to more appropriate. Or at the highest input voltage state, the full output, the transformer can transition to the continuous state on it. 中文譯文： 開關(guān)電源設(shè)計 開關(guān)電源狀態(tài)，電源工作在高頻率，高脈沖的模擬電路的一個比較特殊的一種。布板布線原則遵循高頻電路。 一 ，布局： 脈沖電壓連接盡可能短，包括輸入開關(guān)連接到變壓器，輸出變壓器的整流管電纜。脈沖電流回路盡可能小，如輸入濾波電容的負(fù)返回變壓器開關(guān)電容器。 一些外端輸出變壓器，輸出整流變壓器電 路 X 電容盡可能靠近開關(guān)電源的輸入輸出電容， 輸入線 能 避免與其他電路平行 的 ，應(yīng)該 盡量 避免。 Y 電容應(yīng)放置在機(jī)箱的接地端子或 FG 連接器。 一個觸摸感應(yīng)和變壓器總要保持一定的距離，以避免磁耦合。 總的輸出電容可以使用的其他兩個緊密整流器輸出端應(yīng)接近，可能會影響電源的輸出紋波指標(biāo)，兩個小電容并聯(lián)電容器 的結(jié)果 應(yīng)該比使用大。 加熱裝置 要保持一定的距 離，電解電容，延長機(jī)器壽命，鋁電解電容器是開關(guān)電源的 供電 瓶頸，如變壓器，電源控制，高功率電阻器和電解空間的距離為維持電解質(zhì)之間需要離開耗散，條件允許的話，可能被放置在入口。 控制部分要注意：高阻抗電路連接到樣品的反饋回路短弱信號處理中盡量避免干擾，電流采樣信號的電路，特別是電流控制電路，容易處理一些意想不到壞的事故，其中有一些技巧 . 二，路徑 對準(zhǔn)電流密度：現(xiàn)在大部分的電路板使用絕緣銅電子構(gòu)成并列。常見的 PCB銅層厚度 35μm ， 標(biāo)準(zhǔn)值為 1A/mm，按照目前的密度值，具體計算可以 參考 教科書。為了確保機(jī) 械強(qiáng)度的對齊原則應(yīng)大于或等于 毫米寬（其他非電源電路板可能會 為 更小的最小線條寬度）。 PCB 的厚度為 70μm 銅也是常見的開關(guān)電源供應(yīng)，則電流密度可以更高。 補(bǔ)充一點(diǎn)，現(xiàn)在 常用 電路板設(shè)計工具設(shè)計軟件性參數(shù)，一般的項(xiàng)目，如線寬，線間距，孔大小等 數(shù)值可根據(jù) Guo Jin Xing 參量 設(shè)置。在電路板的設(shè)計， 設(shè)計軟件自動按照規(guī)格 ，可以節(jié)省時間，減少工作量，減少一些錯誤率。 一般來說 ,更高的可靠性 ,在線或線密度布線 可用于雙面板。其特點(diǎn)是價格適中，可靠性高，能滿足大多數(shù)應(yīng)用。 一些產(chǎn)品的電 源模塊 行列， 也被用于膠合板，主要是方便設(shè)備的集成，如電力變壓器電感優(yōu)化布線，制冷等行業(yè)的功率管。良好的一致性與工藝美觀，變壓器冷卻良好的優(yōu)勢，但其缺點(diǎn)是成本高，彈性差，只適合于工業(yè)化大生產(chǎn)。 單面，電力供應(yīng)市場上流通使用的幾乎是普遍的切換單雙面電路板，它具有技術(shù)優(yōu)勢和生產(chǎn)成本較低的設(shè)計，也采取了一些措施，以確保其性能。 單 PCB 設(shè)計，今天談一些經(jīng)驗(yàn)，為制造功能單一的面板，成本低，易于開關(guān)電源的電路已被廣泛使用，因?yàn)樗倪吔壷挥秀~，設(shè)備的電氣連接，機(jī)械固定要依靠銅層，處理一定要慎重。 為了保證焊接結(jié)構(gòu)件的機(jī)械性能良好，單面墊應(yīng)該再大一點(diǎn)，以確保良好的銅和基材并列焦點(diǎn)，因而不會感到震 動 時，銅帶，折斷。 一般焊接環(huán)寬度應(yīng)大于 毫米。焊盤直徑應(yīng)略大于銷直徑的設(shè)備，但不太大，確保了最短的距離引腳和焊盤之間的連接由焊料，板孔尺寸應(yīng)不妨礙調(diào)查的正常程度的條件，墊直徑一般大于銷直徑 的。多針裝置，確保順利調(diào)查 元 件也 可以 較大。 電氣連接應(yīng)盡可能廣泛，原則上應(yīng)直徑大于墊寬度，特殊情況應(yīng)連接線的需要擴(kuò)闊路口墊（通常稱為淚水代），以避免破壞某些條件，線，墊。最小線條寬度 原則應(yīng)大于 毫米。 單板組件接近電路板。需要冷卻設(shè)備到設(shè)備的開銷和電路板之間加套管針，可以起到支撐裝置，提高保溫的雙重作用，盡量減少或避免外部沖擊的影響交界的墊腳，提高了焊接的堅定性。 電路板支持點(diǎn)的大部分重量可以增加連接，可以提高連接強(qiáng)度板，如變壓器之間的電路，功率器件的