英文翻譯自動化專業(yè)1.pdf

本科畢業(yè)設(shè)計外文翻譯 學(xué) 院 專業(yè)班級 學(xué)生姓名 指導(dǎo)教師 The Introduction Of High Frequency Switching Power Supply Introduction High frequency switching power supply also called switch rectifier SMR through the MOSFET or the high frequency IGBT switch frequency control in 50 100 KHZ within the scope of efficient and realize miniaturization In recent years switch rectifier power capacity expansion the capacity of himself from the volt 48V 12 5A 48V 20A to48V 200A 48V 400A High frequency switching power supply is traditional rectifier silicon rectifier silicon controlled rectifier upgrade alternative products High frequency switching power supply with convenient use small size high efficiency stable work coating meticulous etc absolute superiority quickly dominate the market Widely used in electroplating electrolysis surface treatment industry oxidation and get old and new customers Product features 一 This product USES imported brand components and international advanced bridge in precision machining technology of inverter and make the performance is stable the quality is reliable 二 For high frequency pulse waveforms output ripple coefficient the 1 can improve the number of plating and surface aestivation refuse the gloss and got a dark corner of plating And can reduce the loss raw materials of plating industry of special requirements 三 SFG series high frequency switching power supply by air filled type design installation convenience With remote control device easy for operation Can bring load switch machine reduce the adjustment of the complex procedures 四 Small volume light weight the comprehensive use of anticorrosive craft enhance the ability of anti corrosion products prolong the life 五 Energy saving high working efficiency reached more than 90 any more than a linear always voltage matching Save the traditional rectifier regulator and the energy loss in more than 35 greatly reduce the cost the reason of surface treatment industry High frequency switching power supply 一 The main circuit From the input and output of dc exchange network including 1 The whole the effect is input filter there will be the clutter power filter also hindered the feedback to produce clutter of public power 2 And rectification and filtering ac power grid directly to a smooth dc rectification in order to the next level 3 Inverter after rectifying dc into high frequency alternating this is the core part of switch power supply the higher the frequency volume and weight and output power than smaller 4 And output rectifier and filtering according to provide reliable load of the dc power supply Second control circuit On one hand the sample from the output terminal with setting standards and then compared to control the inverter change the frequency or pulse width achieve output stability on the other hand according to the test circuit the information provided by differential protection circuit control circuit of various protection measures Third detection circuit In addition to providing protection circuit is running in the various parameters but also provide various display meter data Four the auxiliary power To provide all the different requirements of a circuit switching voltage control principle Switch to certain time interval K repeatedly through and disconnect the switch the power input K E through switch and filter circuits provide load RL throughout the switch power load during to provide energy E When the switch input power disconnection K E will provide energy interrupted Visible to provide the energy input power load is intermittent for the load can be provided for energy switching power supply a storage device must be in switch will be part of the energy stored in the switch to load release In the figure the inductance and capacitance C2 and diode L circuit is composed of D this function Inductance used in storing energy l and stored in the switch of energy through the diode inductance L D released to load get steady and continuous energy because diode D make continuous load current so called free wheeling diode In EAB average voltage between AB says under the type used EAB TON T E For every TON of time the switch to switch the huge T works cycle i e switch time TON TOFF cut off time and sum By type changing switch time and work cycle the ratio between the average voltage AB also changed therefore with the load and the input voltage changes automatically adjusted TON and the proportion of T he can make the output voltage V0 remain unchanged Change through Time and work cycle TON of pulse that changing proportion of this method SHCH as Time Ratio Control from Time abbreviation for TRC According to the control principle TRC have three ways A Pulse Width Modulation Pulse Width Modulation the abbreviation for PWM Switch is constant by changing the pulse width to change the way SHCH Second Pulse Frequency Pulse Modulation some Modulation abbreviated PFM The constant change of the pulse width through the working frequency switches to change the way SHCH Third mix modulation Conduction pulse width and switch jobs are not fixed frequency each other can change the way and it is more than two ways of mixed High frequency switching power supply 1 don t need to increase speed switches can theoretically the switch loss to zero and noise is small The development of switch power Switching power supply for has the advantages of small size light weight high efficiency low calorific value and stable performance advantages and gradually replace traditional manufacturing technology of continuous work power and widely used in electronic machine and equipment In the 1980s the full realization of computer the switching power supply complete computer In the 1990s switch power supply in electronics electrical equipment and home appliance field has been widely applied switch power technology into rapid development Switching voltage stabilizer adopts power semiconductor as switch through the control switch SHCH adjustment output voltage In power transistors GTR for example when a switch tube saturated conductivity the collector and emitter on both ends of the pressure drop to zero When the switch tube the collector current deadline to zero So the consumption efficiency can be up to 70 95 While consumption also decrease Radiator switching voltage stabilizer for grid voltage directly rectifier filter and then adjusted by adjusting voltage switch pipe need not power transformer In addition switch frequency for dozens of KHZ filter capacitor inductor value Therefore switching power supply is light weight small size etc In addition due to the low consumption low temperature improve the stability and reliability of the machine And on the grid adaptive capability has increased the average power serial Manos tat allows for 220 10 fluctuate but switching voltage stabilizer in voltage in a 110 260 volts range change can obtain stable output voltage The high frequency switching power supply is the development of technology innovation technology high frequency of the benefit is that switching power supply device to miniaturization and make an unprecedented power switch into a wide range of areas especially in the high tech fields of application promote the high tech products of miniaturization light Now on the market of switch power supply power tube with a bipolar transistor switch frequency can reach several KHZ The switch power MOSFET using frequency conversion of hundreds of KHZ To improve the switch frequency must adopt high speed switching devices For the power switch frequency than MHZ available resonant circuit this way of working is called resonant switching mode It can greatly improve switch speed theoretically switch loss to zero the noise is small and it is to improve the working frequency of switch power By way of resonant switching converter has practical level MHZ Pursuit of switch power supply technical development trend and can be summarized in the following four aspects A miniaturization thin light high frequency switching power supply of of volume weight is mainly composed of storage devices magnetic components and capacitance so the miniaturization of switch power supply is essentially to minimize the volume of storage devices In a certain range the switch frequency not only can effectively reduce capacitance and inductance and the size of the transformer but also can restrain the interference improve the dynamic performance of the system Therefore high frequency switching power is the main development direction Second high reliability the use of switch power supply for a job than components ten times thus increasing the reliability From the Angle of life capacitors optical coupler and platoon devices such as life determines the communication power of life So from design use less as far as possible improve integration Such not only solved the reliability of complex the circuit also increases protection function simplify the circuit improve MTBF Third low noise one of switch power supply noise is Simply pursuit of high frequency and noise also is met subsequently increased The partial resonant converting circuit technology in principle on which can not only improve the frequency and can reduce the noise So as far as possible to reduce the noise influence of switch power supply is a development direction Four using computer aided design and control USES the latest technology design CDD CAA and transformation of topology and the best parameters make the switch power structure and the best condition Jane in the circuit into microcomputers detection and control monitoring system can form multi function real time detection record and automatic alarm and etc The development of switch power supply is and semiconductor devices and the development of magnetic components The high frequency need corresponding high speed semiconductor A high frequency electromagnetic with excellent performance Development power MOSFET IGBT etc develop new high speed device with low frequency magnetic materials improving the loss of magnetic components of the structure and the design method enhances the filter capacitor dielectric constant and reduce its equivalent series resistor etc to switch power miniaturization has produced a great impetus 高頻開關(guān)電源介紹高頻開關(guān)電源介紹 簡介 高頻開關(guān)電源 也稱為開關(guān)型整流器 SMR 通過 MOSFET 或 IGBT 的高頻工 作 開關(guān)頻率一般控制在 50 100kHz 范圍內(nèi) 實現(xiàn)高效率和小型化 近幾年 開關(guān)整流器的功率容量不斷擴大 單機容量己從 48V 12 5A 48V 20A 擴大到 48V 200A 48V 400A 高頻開關(guān)電源是傳統(tǒng)整流器 硅整流器 可控硅整流器 的升級替代產(chǎn) 品 高頻開關(guān)電源以使用方便 體積小 效率高 工作穩(wěn)定 鍍層細致等絕對 的優(yōu)勢迅速占領(lǐng)市場 廣泛使用于電鍍 電解 氧化等表面處理行業(yè) 并得到 新老客戶的一致好評 產(chǎn)品特點 1 本產(chǎn)品采用進口名牌元器件和國際先進的全橋逆變換流技術(shù)精密加工而 成 使整機的性能穩(wěn)定 質(zhì)量更加可靠 2 流輸出波形為高頻方波 紋波系數(shù)大大主小于 1 可提高鍍數(shù) 拒 絕鈍化 增強鍍層表面的光澤度和鍍件暗角的鉆芯度 并可減少原材料的損 耗 達到電鍍行業(yè)的各種特殊要求 3 SFG 系列高頻開關(guān)電源采用風(fēng)冷式設(shè)計 安裝方便 并配有遠控裝 置 操作簡單 可以帶負載開關(guān)機 減少調(diào)節(jié)的煩瑣程序 4 體積小 重量輕 整機運用了全方位的防腐工藝制作 增強了產(chǎn)品 的防腐蝕能力 延長了使用壽命 5 高效 節(jié)能 工作效率達到 90 以上 任意電壓電流比始終成線性匹 配 省去了傳統(tǒng)整流器的調(diào)壓器和主變的損耗 節(jié)能在 35 以上 大大的減輕 了電鍍成本 實為表面處理行業(yè)最理智的選 高頻開關(guān)電源原理 一 主電路 從交流電網(wǎng)輸入 直流輸出的全過程 包括 1 輸入濾波器 其作用是將電網(wǎng)存在的雜波過濾 同時也阻礙本機產(chǎn) 生的雜波反饋到公共電網(wǎng) 2 整流與濾波 將電網(wǎng)交流電源直接整流為較平滑的直流電 以供下 一級變換 3 逆變 將整流后的直流電變?yōu)楦哳l交流電 這是高頻開關(guān)電源的核 心部分 頻率越高 體積 重量與輸出功率之比越小 4 輸出整流與濾波 根據(jù)負載需要 提供穩(wěn)定可靠的直流電源 二 控制電路 一方面從輸出端取樣 經(jīng)與設(shè)定標準進行比較 然后去控制逆變器 改變 其頻率或脈寬 達到輸出穩(wěn)定 另一方面 根據(jù)測試電路提供的資料 經(jīng)保護 電路鑒別 提供控制電路對整機進行各種保護措施 三 檢測電路 除了提供保護電路中正在運行中各種參數(shù)外 還提供各種顯示儀表資料 四 輔助電源 提供所有單一電路的不同要求電源 開關(guān)控制穩(wěn)壓原理 開關(guān) K 以一定的時間間隔重復(fù)地接通和斷開 在開關(guān) K 接通時 輸入電源 E 通過開關(guān) K 和濾波電路提供給負載 RL 在整個開關(guān)接通期間 電源 E 向負載 提供能量 當開關(guān) K 斷開時 輸入電源 E 便中斷了能量的提供 可見 輸入電 源向負載提供能量是斷續(xù)的 為使負載能得到連續(xù)的能量提供 開關(guān)穩(wěn)壓電源 必須要有一套儲能裝置 在開關(guān)接通時將一部份能量儲存起來 在開關(guān)斷開 時 向負載釋放 圖中 由電感 L 電容 C2 和二極管 D 組成的電路 就具有這 種功能 電感 L 用以儲存能量 在開關(guān)斷開時 儲存在電感 L 中的能量通過二 極管 D 釋放給負載 使負載得到連續(xù)而穩(wěn)定的能量 因二極管 D 使負載電流連 續(xù)不斷 所以稱為續(xù)流二極管 在 AB 間的電壓平均值 EAB 可用下式表示 EAB TON T E 式中 TON 為開關(guān)每次接通的時間 T 為開關(guān)通斷的工作周期 即開關(guān)接通 時間 TON 和關(guān)斷時間 TOFF 之和 由式可知 改變開關(guān)接通時間和工作周期的比例 AB 間電壓的平均值也隨 之改變 因此 隨著負載及輸入電源電壓的變化自動調(diào)整 TON 和 T 的比例便能 使輸出電壓 V0 維持不變 改變接通時間 TON 和工作周期比例亦即改變脈沖的占 空比 這種方法稱為 時間比率控制 Time Ratio Control 縮寫為 TRC 按 TRC 控制原理 有三種方式 一 脈沖寬度調(diào)制 Pulse Width Modulation 縮寫為 PWM 開關(guān)周期恒定 通過改變脈沖寬度來改變占空比的方式 二 脈沖頻率調(diào)制 Pulse Frequency Modulation 縮寫為 PFM 導(dǎo)通脈沖寬度恒定 通過改變開關(guān)工作頻率來改變占空比的方式 三 混合調(diào)制 導(dǎo)通脈沖寬度和開關(guān)工作頻率均不固定 彼此都能改變的方式 它是 以上二種方式的混合 高頻開關(guān)電源 1 不需要大幅度提高開關(guān)速度就可以在理論上把開關(guān)損耗降 到零 而且噪聲也小 開關(guān)電源的發(fā)展 開關(guān)電源因具有體積小 重量輕 效率高 發(fā)熱量低 性能穩(wěn)定等優(yōu)點而 逐漸取代傳統(tǒng)技術(shù)制造的連續(xù)工作電源 并廣泛應(yīng)用于電子整機與設(shè)備中 20 世紀 80 年代 計算機全面實現(xiàn)了開關(guān)電源化 率先完成計算機的電源換代 20 世紀 90 年代 開關(guān)電源在電子 電器設(shè)備 家電領(lǐng)域得到了廣泛的應(yīng)用 開關(guān) 電源技術(shù)進入快速發(fā)展期 開關(guān)型穩(wěn)壓電源