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This paper presents a detailed performance comparison (including efficiency, EMC performance and component electrical stress) between boost and buck type PFC under critical conduction mode (CRM). In universal input (90-265Vac) applications, the CRM buck PFC has around 1% higher efficiency compared to its counterpart at low-line (90Vac) condition. Due to the low voltage swing of switch, buck PFC has...
We report the DC and switching performance of a normally-off 5 A/1100 V GaN-on-Si device. The device had a breakdown field of 95 V/??m and a VB2/Ron,sp of 272 MW/cm2. A 360 V/180 W boost converter was operated at 200 KHz, with an efficiency >92%. Respectively, these values are the highest for a normally-off GaN-on-Si device.
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
Common-mode and magnetic emission performance of isolated dc-dc converter modules are identified as parameters critical to the success of next-generation semiconductor test architecture. Specification and application data from commercial suppliers does not include these parameters - making characterization necessary. This paper provides a brief analysis of system architecture leading to a proposalfor...
In recent years, the new field of micromagnetic devices has drawn the attention of an increasing number of researchers. The objective in this field is to develop very small magnetic microdevices with a planar structure for high-frequency applications. Three technologies are being exploited in order to achieve higher scales of integration: the development of new materials, microlithography and dry...
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