Tuning a Resonant DC/DC Converter on the Second Harmonic for Improving Performance: A Case Study

Pareschi, Fabio; Blecic, Raul; Mangia, Mauro; Barić, Adrijan; Rovatti, Riccardo; Setti, Gianluca

doi:10.1109/iscas.2019.8702181

Cited by 1 publication

(2 citation statements)

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“…This assumption is actually not correct. The existence of multiple solutions has been observed in [49], where authors addressed additional solutions as higher harmonic solutions since currents and voltages waveforms present more than one oscillation in a clock period. The name reflects the common approach to tune an RF amplifier on the second or higher harmonic to increase its operating frequency.…”

Section: F Uniqueness Of the Optimal Solutionmentioning

confidence: 99%

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A Methodology for Practical Design and Optimization of Class-E DC-DC Resonant Converters

et al. 2020

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In recently published papers, an innovative analytical approach for the design of a class-E resonant dc-dc converter has been first proposed and further extended to many other class-E converter topologies. Its peculiarity is to be dimensionless and based on the exact solution of the system of differential equations regulating the behavior of the circuit, ensuring very high precision and reliability with respect to all methodologies previously proposed by the state-of-the-art and based on the so-called sinusoidal approximation. Here, we review this methodology and improve it in a twofold way. On the one hand, we propose alternative modeling for some devices (in particular the transformer), increasing both flexibility and generality, with the possibility to extend the application to more topologies and more working points. On the other hand, a new normalization is proposed, showing that the actual dimension of the design workspace is 2, and not 3 as assumed in the previous works. This has important consequences. As an example, the solution existence condition can be represented on a simple 2D plot, with the possibility to immediately check whether the optimal class-E condition can be ensured or not. Furthermore, we can completely and conveniently explore the entire design space to investigate properties such as the stress on the switching devices or the root-mean-square currents, allowing further optimization of the converter design. INDEX TERMSCircuit theory, class-E converters, dc-dc converters, resonant converters. I. INTRODUCTIONResonant dc-dc converters have been introduced to operate at high switching frequencies and so increase system power density [1]-[8], with advantages also in terms of dynamic performance [2] and EMI [8], [9]. Frequencies up to the VHF range 30 − 300 MHz are possible [6], [7] by lowering switching losses thanks to techniques used in radio-frequency (RF) power amplifiers [1], [2], [10], thus overcoming the main drawback of conventional switching topologies given by the frequency-dependent losses.We focus here on the class-E approach [2], [5], featuring the so-called soft-switching technique in opposition to the hard-switching of class-D converters. It was first proposedThe associate editor coordinating the review of this manuscript and approving it for publication was Yuh-Shyan Hwang.

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Section: F Uniqueness Of the Optimal Solutionmentioning

confidence: 99%

“…According to [49], tuning the design of a converter on the second harmonic may lead to two advantages: i) the reduction of either the size of the magnetic elements or the clock frequency; and ii) a small but non-negligible increase in the converter efficiency. Therefore, this approach deserves investigation.…”

Section: F Uniqueness Of the Optimal Solutionmentioning

confidence: 99%