Switched-mode power supply charger For an electric car Aarne Liski Atte Yrjölä Jere Kinnunen

Background

Switched-mode power supply 230V AC input Rectified H-bridge generates square wave voltage Transformer provides galvanic isolation and it also alters the voltage and current levels supplied from the inverter Full-Wave Bridge Rectifier LC filter to get rid off the ripple in the output waveform DC voltage to the batteries ~325V 10-15A DC output

SMPS charger

H-bridge pulse-width modulation

Plan Study previous implementation and converter topology Select new PWM implementation (lock switching frequency) Start sizing the components (diodes, capacitors, inductors, transformer etc.) Simulation

PWM implementation solutions Single signal PWM IC with logic subsection Simple design One PWM signal is transformed into gate signals by logic subsection Over 90% efficiency Good document how this is used in practice 4 signal PWM IC with ZVS 4 PWM signals with phase shift Phase shift enables Zero-Voltage-Switching Reduced switching losses and EMI Switching frequencies up to 1 MHz are practical