8-18 電源供應器基本觀念.pdf電源供應器基本觀念電源供應器:線性式電源供應器及切換式電源供應

文件名称: 8-18 電源供應器基本觀念.pdf

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详细说明：電源供應器基本觀念電源供應器:線性式電源供應器及切換式電源供應器The basic functions of a dc-dc converter are as follows to provide conversion of a dc input voltage VI to the desired dc output voltage within a tolerance range . to regulate the output voltage Vo against variations in the input voltage VI, the load current lo(or the load resistance RL), and the temperature; 3) to reduce the output ripple voltage below the specified level to ensure fast response to rapid changes in the input voltage and load current (or load resistance) to provide dc isolation; to provide multiple outputs to minimize the electromagnetic interference (EMi below levels specified by EMI stan dards Static characteristics of DC voltage regulators Large signal analysis: using kcl Kvl) Const TA= Const Actual 望⑤ Ideal Odom △ 属好 △V 0 〔单俞入电 Imin Inom Imax Output voltage Vo versus input voltage VI for voltage regulators, illustrating line lation V= Const TA= Const Ideal O(NL) V之妻萝国 O(minl)F-L Actual 包 O(FL) 0 min 如m合(戴烹剪 Output voltage Vo versus output current lo for voltage regulators, illustrating load regulation Dynamic characteristics of DC voltage regulators (small signal analysis: using Laplace transformation Omax Voltage 尸n Regulator Circuit for testing the line transient response of voltage regulators 大Yes s足 △ 0 k s i Omax Odom Omin 0 Waveforms illustrating line transient response of voltage regulators.(a) Waveform of the input voltage vI.(b) Waveform of the output voltage vo Circuit for testing the load transient response using an active current sink DC-DC Converter △l III k resist YRgow Unregulated Regulated AC Low- Frequency Rectifier Filter Linear DC Voltage Load Transformer Regulator Unregulated Requlated AC DC Isolated DC Rectifier Filter Switching Load Regulator 3 高④ Block diagrams of ac-dc power supplies. (a) with a linear regulator.(b)With a switching-mode voltage regulator Isolated SMPS function blocks RFI filter AC/DC DC/DC 2 Feedback control Depending on noise transmission, there are two categories of noise conducted noise(450khz to 30 MHz) radiated noise(30 MHz to 1 GHz) AC/DC converter: without PFC function(diode rectifier)and with PFC function DC/DC converter: flyback, forward, half-bridge and full-bridge(with high fre transformer Feedback& control: output filter(L, C), voltage divider, OVP, OCP, OTP, optocoupler, OP amp or TL431, PWM IC 12 17W Flyback adaptor GeR t208 2 -=--==-=== O+1V 博上=gx楼器 2 EM」 OV 4 t-.---m 4 T spv 18 : s0087 83at/25v COMa vce 4 .LF/5 [ /50\ 1 Output Voltage Adjust 1-------------------------------- SMPS Considerations In-rush current Voltage and current stresses of rectifier diode input filter inductor design with PFC: inductance, core size core and copper losses, saturation problem Isolation transformer: core and copper losses, winding turns wire size, magnetizing inductance, air gap) Power MOSFET: drive loss(Qo), switching loss( ds max and ids, max), conduction loss (is.rms and Ras, on), lump capacitor loss lump and v ds max/,vds stress and ldsstress High frequency rectifier diodes: vdstress, idav, iRM,t Filter inductor(choke): inductance, core size, Bmax, winding turns, core and copper losses Filter capacitor: ims, capacitance, r esI Feedback and controller: TL431, Optocoupler, type II and type III controller design, oVP, OCP OTP, current or voltage mode control, current slope compensator, max. duty cycle limit 14 高壓端整流與濾波(AC/C: (1)指撥開關式交流對直流整流電路 (2)全範圍交流輸入之交流對直流整流電路 (3)全範圍交流輸入功因改善器 NTC RI Cy 110V Cx Cx(大 Cy 立 R2 圆較小八)指撥開關式交流對直流整流電路 2X(85~5 ￠3好5:1305) 330K 224x35 550uF/20vV VARI 103/1K 150v 1乐kE350A DIP.1K D=5. 0mm 5w(min) 5w(min) 330K TI-A ERL35 103/1kv DIpLe DIP.tRy RCD BYV26E(NC) VAR2 D041 560uF200V 150V 330K 0805 1N4148 D035 平句 Q1 1200 STV12NK9OZ 指撥開關AC/C √sNDA 社电电配 51R 3 TO3P 10R 1-SW 0503 uC38438 soap CoMp 0R12 3w R102 OUT 0603 RT/CT GND 0603 HEATSINK C103 GNDA (824W~22) NTC 人人 ac Cx Cx大) K上到大 2)全範圍交流輸入之交流對直流整流電路 N左右 V4>265*1.414 妾化配圆 5 七 3)全範圍交流輸入功因改善器 d o n5, pak,m ax=52v265 功率因數的改善諧波的定義:指電壓或電流除本身所含之基本波外·其餘高頻量均稱為諧波。 ()=v2 ig,sine(2+)+∑√2 insId(27ft+, 諧波的來源:■電力電子轉換器類鐵心激磁類諧波造成的影響∶翰電線損失増加丶對通訊糸統干擾丶引起保護設備的誤動作丶電力儀表值的損失……等。在電力電子轉換器中’非線性負載通常為橋式整流電路優點:·價格便宜構造簡單堅固耐用 D,7 缺點:·低功率因數 °高電流諧波產生高脈衝電流

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