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SWITCH -MODE POWER SUPPLIES AND SYSTEMS

SWITCH -MODE POWER SUPPLIES AND SYSTEMS. Lecture No 1. Silesian University of Technology Faculty of Automatic Control, Electronics and Computer Sciences Ryszard Siurek Ph.D., El. Eng. Program of the course. Lecture No 1 - General overview of power supplies, basic func-

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SWITCH -MODE POWER SUPPLIES AND SYSTEMS

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  1. SWITCH-MODE POWER SUPPLIES AND SYSTEMS Lecture No 1 Silesian University of Technology Faculty of Automatic Control, Electronics and Computer Sciences Ryszard Siurek Ph.D., El. Eng.

  2. Program of the course Lecture No 1 - General overview of power supplies, basic func- tions, static and dynamic parameters related to the output Lecture No 2 - protection circuits (overcurrent, overvoltage etc.), additional functions and indications, paralleling of power supplies, redundancy Lecture No 3 - Input parameters specified for power supplies, Electomagnetic Noise emission, Power Factor, Immunity against electromagnetic disturbances, general overview of power supply systems Lecture No 4 - Linear regulator in comparison to switching one, analysis of basic topology – step-down switching regulator, general equations and waveforms Lecture No 5 - Analysis of step-up and flyback switching topolo- gies, basic equations and waveforms, problem of discontinuous current (magnetic flux) flow Lecture No 6 - Switching converters, pulse power transformer, analysis of single-ended forward converter, trans- former reset circuits, transformer saturation

  3. Lecture No 7 - Push-pull converter analysis, transformer opera- tion explanation on hysteresis curve, core satu- ration problems, bridge an half bridge converters Lecture No 8 - Single-ended flyback converter analysis, parasitic (leakage) inductance problems, multi-output power supplies Lecture No 9 - Output filter components - capacitors, inductors, influence on switching regulator performance Lecture No 10 - Power losses in magnetic components, skin and proximity effects Lecture No 11 - Pulse transformer designing basis – flyback, for- ward and push pull converter, power losses in switching regulator, power losses reduction Lecture No 12 - Regulated switching converters, closed feedback loop analysis

  4. Recommended books and articles 1. Abraham I. Pressman - Switching Power Supply Design, Second Edition, McGraw-Hill, New York, 1998 2. Billings K. - Switchmode Power Supply Handbook, McGraw-Hill, New York, 1989 3. Texas Instrument - Power Supply Design Seminars(1996 to 2007), to view or download go to: power.ti.com (Support/Training/Seminar Materials) 4. Ferenczi O.-Zasilanie układów elektronicznych. Zasilacze impulsowe, WNT, Warszawa, 1989 5. Pałczyński B., Stefański W. - Półprzewodnikowe układy i urządzenia techniki impulsowej, WKL, Warszawa, 1973

  5. Basic requirements for low and medium power DC Power Supplies General configuration of the Power Supply safety low voltage area (ELV or SELV) hazardous/lethal voltage area -15% - +10% regulated voltages = / ~ U1 ~ = U2 primary circuit secondary circuit(s) . . isolated output . Un input/line voltage AC or DC isolation barrier output DC voltages

  6. Essential functions performed by the typical Power Supply • Delivering of one or several output voltages with certain load capabilities, mostly DC voltages in the range of 3V to 48V • Protection against electric shock – sufficient isolation of low voltage outputs from hazardous supply/line voltage • Output voltage/voltages regulation against input voltage and load changes

  7. Output voltage static (steady state) parameters Equation describing the influence of most important factors on the output voltage dUout dIo dUout dUwe dUout dT DUout = DIo + DUwe+ DT x x x (1.1) Load regulation coefficient Line regulation coefficient Temperature coefficient %Uout %Uout %Uout DIo DUwe deg (Iomin – Iomax) (Uwemin – Uwemax) Presented usually in technical data sheets Presented usually in technical data sheets Presented usually in technical data sheets

  8. Ripple and noise – observed within the range of several hundreds of Hz Uwy 10ms - 100Hz t ms

  9. Output voltage dynamic parameters output voltage – mean value DUwyp-p basic ripple switching ripple Output voltage ripple & noise 5 10 15 20 25 30 Magnified output voltage waveforms observed within the range of several hundreds of kHz

  10. Dynamic output voltage swing related to load current step change load current output voltage load current step change output voltage dynamic reaction output voltage static change - load regulation

  11. Start-up overshoot) Uout low load Uo heavy load t

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