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

2. Background

3. 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

4. SMPS charger

5. H-bridge pulse-width modulation

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

7. 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