SJSU EE 136 - Line Rectification and Capacitor (19 pages)

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Line Rectification and Capacitor



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Line Rectification and Capacitor

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Pages:
19
School:
San Jose State University
Course:
Ee 136 - Semiconductor Power Electronics

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Line Rectification and Capacitor Input Filters For Direct off Line Switchmode Power Supplies Overview Switchmode Supplies vs Linear Supplies Characteristics of typical Direct off line Circuit for Switchmode Supplies Characteristics of Switchmode Supplies Simulation Calculations Applications What is Direct off Line Power supply operates directly from AC line No transformer prior to rectification and filtering Switchmode vs Linear Switchmode Linear Near constant efficiency and power load Constant current load Wide input voltage range Low cost Low heat generation Low noise High reliability Easy to use Small size transformer Large bulky transformer Frequency 100 300 kHz Frequency 50 60 Hz Types of Switchmode Supplies Flyback topology Forward topology Half Bridge topology Push Pull topology Full Bridge topology Typical Off line Dual Voltage Rectifier Filter Circuit Off line AC Power Line Series Resistance ESR DC DC Converter Load Characteristics Voltage Operation 120Vac 240Vac 120V operation for voltage doubler 240V operation for full bridge rectifier Effective Series Resistance Source resistance reduce peak currents 20mOhms 600mOhms Inrush Limiting thermistor used for startup 1Ohm Characteristics Constant Power Load Output voltage fixed under steady state conditions Near Constant efficiency for load Rising Current Resistance Factor Parameter used for calculating current loads Designing Effective Input Current Ie RMS Input Current Iin rms Capacitor Current Icap Peak Input Current Ipeak Capacitor Size Ce DC Output voltage Vo Designing Designing Simulation Simplified Capacitive Input Filter w Single Phase Full Wave Bridge Rectifer and Lumped Total Effective Source Resistance Ipe ak Ie VAL RMS 7 0 7 A 2 1609 2 Ie Icap rms VAL VinRMS VAL W Icap rms 0 169913 k VM1 RMS 7 0 7 2 07 848 R 42 RS WM1 V C 375u AMPL 0 240416305603426k FREQ 50 RMS 7 0 7 D2 D1 R 425 E1 Ce RL VinRMS Vout DC VAL Converter load MEAN VALUE 0 2321 03k D3 D4 Vout DC 0 2 5k VM 1 V V Vload V V RS R Ohm 0 2k 0



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