Phase-Shifted Full-Bridge ZVS DC-DC Converter with Synchronous Double Rectifiers for Battery Charging Applications
Table 1
Comparison of the full-bridge converter system.
Topologies
Full-bridge LLC
PSFB
Frequency
Variables are used as control inputs. Therefore, it is difficult to synchronize and parallelize multiple converters. The design of magnetic components is also more complicated because the frequency changes when required to control.
Easier fixes for synchronization. Easy to parallelize multiple converters and share current.
Conversion ratio
The output voltage is easy to find.
Complex, approximate expression that is not accurate from resonance frequency.
ZVS
Yes, but harder at higher frequencies due to noise.
Yes, ZVS is possible for all primary and even secondary-side active and passive switches.
Efficiency
Good. The efficiency is higher than the phase-shifted full bridge.
