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In this paper, we construct three Class-Φ2 resonant converters with GaN HEMT power devices, 1 kW output power, and switching frequencies of 10 MHz, 30 MHz, and 54.24 MHz. The GaN HEMTs in these converters exhibit losses, approximated thermally, that are significantly higher (up to an order of magnitude) than those predicted by simulation. To investigate, we use a Sawyer-Tower circuit to evaluate the...
In high-frequency and very-high-frequency power converters, which operate with switching frequencies between 3 and 300 MHz, efficient power inductors cannot be constructed with commercially available core materials. In this regime, air-core inductors are preferred, and the toroidal geometry best constrains the magnetic field. These inductors have been implemented as printed circuit board (PCB) traces...
High-power, bidirectional DC/DC converters are widely used in electric vehicles. As vehicle volumes increase, the robust and efficient testing of these converters will be key to high reliability and low cost. A highly configurable, closed-loop, regenerative burn-in test system is presented here that reduces power supply and load requirements to less than 1/10th of those required for conventional test...
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