Transcript Slide 1
This is a photographic template – your photograph should fit precisely within this rectangle. Practical AC Circuits Dr. Phillip Hunter © 2008 Eaton Corporation. All rights reserved. Practical AC Circuits • Eaton - Christchurch • Job Overview • Rectifier Design • Resonant Power Conversion 2 2 Eaton Corporation • Diversified power management company ~75,000 employees worldwide (2008 Sales $15.4 billion) • Truck • Automotive • Aerospace • Hydraulics • Electrical • Telecommunications Power, Christchurch ~130 Staff 3 3 Telecommunications Power Systems 4 4 Rectifier Design EMC Filter 230V AC EMC DC-DC PFC Filter 400V DC 48V DC 5 5 Power Factor Corrector (PFC) • Convert AC to DC • Draw sinusoidal current from the mains • Charge the bulk storage capacitors 6 6 Power Factor Corrector (PFC) • Switch Closed Inductor stores energy • Switch Opened Inductor energy is transferred to output 7 7 DC-DC • Provide electrical isolation • Output voltage control / regulation 400V DC 48V DC 8 8 DC-DC • Output Voltage is adjusted by on time 9 9 DC-DC LLC Frequency adjusts output voltage 10 10 ‘Soft’ Switching • Inductive load and Switch capacitance needed for ‘Zero Voltage Switch’ 11 11 High Frequency Magnetics • Transformer Construction 12 12 Simulation • SPICE (Simulation Program with Integrated Circuit Emphasis) Developed 1960 & 70s at the Electronics Research Laboratory of the University of California, Berkeley • PSPICE - SPICE for a Personal Computer First released 1984 • Convergence issues with power electronic ‘switching’ circuits due to default tolerance settings can be overcome 13 13 Simulation - Time Domain 14 14 Simulation - Frequency Domain 15 15 16 16