Download Switched-mode power supply charger

Switched-mode power supply charger
For an electric car
Aarne Liski
Atte Yrjölä
Jere Kinnunen
Background
Switched-mode power supply
• 230V AC input
1. Rectified
2. H-bridge generates square wave voltage
3. Transformer provides galvanic isolation and it also alters the voltage
and current levels supplied from the inverter
4. Full-Wave Bridge Rectifier
5. 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
Start sizing the
components
(diodes, capacitors,
inductors,
transformer etc.)
Study previous
implementation and
converter topology
Select new PWM
implementation
(lock switching
frequency)
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