<p> This paper provides a practical guideline for conductor arrangement in a planar inductor by investigating various arrangements for conductors. In order to have a comprehensive study, four different structures have been considered and compared. Numerous design parameters such as track width, track length, location of the conductors between the central limb and the lateral limb, and number of transposition points among sub-tracks for both air-core and ferrite-core inductors are considered. Each structure is evaluated according to AC resistance, RAC /RDC, and inductance. Measurement results reveal that it is critical to take into account all three characteristics when deciding the suitable structure for the conductors. Studies are carried out based on measurement results for experimental prototypes in the frequency range of 10Hz-1MHz and a set of guidelines has been provided with regard to the design of planar inductors to achieve desired characteristics. </p>
SUMMARY
In this paper, a high efficiency quasi‐Z‐source inverter with a single high‐frequency switch is proposed to achieve a high efficiency and more compact topology. The converter utilizes a single high‐speed GaN FET. In the proposed converter, four switches operate with low frequency sinusoidal pulse width modulation while the fifth switch short circuits the inverter switch‐legs with a high switching frequency and prepares the shoot‐through current path. The operation of the fifth switch in high switching frequency helps the inverter to operate with modulation index equal to unity. Also, the impedance network operates in high switching frequency, which makes it possible to decrease the components' size. The operation principles, efficiency, and switches' losses of the proposed converter are investigated analytically. A comparison between theoretical and simulation results is performed to validate the theoretical description of the inverter. To validate the well‐behavior of the inverter under various operation modes, the performance of the proposed converter is examined under different types of load. Moreover, loss breakdown and efficiency comparisons are utilized to show improvements with respect to the conventional inverter. The performance of the converter has been examined and validated through a 300 W prototype of the inverter.
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