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The dual active bridge converter is examined as the DC/DC stage of a battery charger for the plug-in hybrid electric vehicle where both load voltage and load current have very wide operating range. The load current for sinusoidal charging scheme could swing down to zero. To optimize the battery charger under this charging scheme, a DAB loss model over wide load range is needed. Traditional DAB analysis...
The approach of integrating a GaN phaseleg, current-boost drivers, and decoupling capacitors can significantly minimize the power loop inductance and the gate loop inductance. However, the driving scheme and sensing scheme are still critical and challenging in order to survive the highly noisy environment due to the GaN switching. A driving scheme of digital isolator plus isolated power supply is...
A high frequency, high efficiency bi-directional battery charger for Plug-in Hybrid Electric Vehicle (PHEV) is built with high voltage normally-off GaN-on-Si HFETs. The battery charger topology consists of a 500 kHz Full Bridge (FB) AD/DC stage and a 500 kHz Dual Active Bridge (DAB) DC/DC stage. The system functionality is verified and measured efficiency is 97% for the AC/DC stage and 97.2% for the...
AC and DC impedances of power converters are used for stability analysis of modern power systems at AC and DC interfaces. The basic idea for impedance extraction is AC sweep approach with sinusoidal signal injection, here denoted as single-tone. However, the approach is time consuming because the time-domain measurement will run many times. Therefore the approach of multi-tone signal injection is...
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