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An approach to power circuit estimation on the base of simple energy-based heuristics was derived by analysing the mathematical principles of resonant power systems intuitively. Practical illustration of the use of this approach is demonstrated for power electronics application design especially of class-E and half-bridge topologies. Experiments indicate that optimisation with intelligent restrictions allows to avoid huge computational expense, and provide prediction of areas with both, high parameter sensitivity, and low parameter sensitivity. The energy-based heuristic approach was proved by logical consistence of topological construction principles, as well as by a remarkable number of load-resonant topologies confirming the theory. To confirm this method to be mathematically applicable, the exact calculation of the used energy-based operators of the heuristic method provided improved agreement between exact system solutions at ideal ZVS/ZCS conditions of the conside red power converters, and their solutions of the approach within parameter-insensitive operation areas. The provided solution understands optimization first of all as a sensitivity analysis to identify the robust areas of system operation in terms of parameter deviation influence before operating areas are set

Design for specific customer service plays a crucial role for the majority of the market in modern electronics. However, adaptability to an individual customer results in increasing design costs. A key to manage these opposite requirements is a wide application of computer aided design tools for multi-objective optimisation of existing IP blocks. In this paper we introduce a new approach to multi-objective optimisation of mixed analogue-digital signal circuits on the base of the univariate marginal distribution algorithm. Practical illustration of the use of this approach is demonstrated for an industrial electronics application design. Experiments indicate that multi-objective optimisation of mixed analogue-digital signal circuits on the base of the univariate marginal distribution algorithm meets different design specifications

In this paper, a new small-signal model for the Class-E DC-DC converter with piezoelectric transformer is presented. The model was obtained using the generalized averaging method, through Fourier harmonics approximation. The model describes all poles and zeros of the system, being accurate for heavy and light loads. The converter was suppose to work under Zero Voltage Switching conditions, and this information was used to simplify the model derivation. Experimental frequency responses demonstrate similar results with the presented model, what validates the method for a higher order resonant converter. The measurements were achieved for a 3W step-down converter, with universal 85-265 V AC input and 6 V DC output voltages

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An array of solutions to handle the losses in switching mode power supplies such as zero-voltages-witching (ZVS), or as zero-current-switching (ZCS), have been developed and applied. There is still a limitation to eliminate the losses in the switching devices to be near to zero. The loss characteristics of a switching IGBT, such as turn-off switching loss due to the tail current under either ZVS or ZCS condition is defined as an important factor that limits the efficiency of the converter, especially in small size power supplies used at high operation switching frequency. In this work the dissipative energy of a resonant converter using PT is not reduced only by ZVS condition, but also by non-switched intervals during the operation, called burst mode. The system is classified to represent two cases of output load, called full load and light load. In the light load situation, the converter can optimize the transferred energy without losing the constant output regulation behaviour, which is done by burst mode control. Different burst mode classification methods between full load and light load have been investigated for different control techniques. The frequency based burst mode classification was evaluated to be most advantageous over phase-angle or switch current time interval observation, perspectively independent of the resonant converter topology. An active burst mode technique has been derived for output voltage feed-back. The work has been proved for a Class-E topology, fulfilling the "Code of conduct on efficiency of external power supplies" in a 3 Watts off-line power supply application [7]

Micro-electromechanical systems are ubiquitous in several energy harvesting solutions and can be used in applications such as bio-implantable devices and wireless micro-sensors. Piezoelectricity is an interesting key to perform the interface between environmental extracted energy and the power delivered to the load due to the use of mechanical vibration and resonance features. However, it is necessary for a detailed analysis in order to obtain an accurate understanding of the system. In this regard, some works deal with the normalization procedures to analyze the piezoelectric component behavior based on the mechanical resonance frequency. In order to enhance the system modeling, the electromechanical resonance frequency must also be analyzed. This paper deals with an approach to model the piezoelectric component that allows analyzing several unitless parameters that are critical to improve the performance of the system. In addition, a state-space model for the piezo-harvester based on the Class-E resonant rectifier is presented. Some experimental results are shown to validate the theoretical approach.[2019-0082]