Abstract
This paper is focused on the design of a control approach, based on the detection of events and changing between two different conduction modes, to reach high efficiency over the entire power range, especially at medium and low power levels. Although the proposed control strategy can be generalized for different topologies and specifications, in this paper, the strategy is validated in a SiC-based synchronous boost DC/DC converter rated for 400 V to 800 V and 10 kW. Evaluation of the power losses and current waveforms of the converter for different conduction modes and loads predicts suitable performance of quasi-square wave mode with zero voltage switching (QSW-ZVS) conduction mode for low and medium power and of continuous conduction Mode with hard switching (CCM-HS) for high power. Consequently, this paper proposes a control strategy, taking advantage of digital control, that allows automatic adjustment of the conduction mode to optimize the performance for different power ranges.
Highlights
Energy storage systems, renewable energies, energy recovery systems, power electronic transformers, DC distribution grids, and smart grids [1,2,3,4,5,6] are some examples of current topics related to power electronics
Among the different technologies of commercially available semiconductors, silicon carbide (SiC) MOSFETs are selected since high efficiency operation of the power converter even under high switching frequencies and high voltage requirements is reachable [12]
When the synchronous boost DC/DC converter is working in Closed Loop (CL), MUX blocks provide G1 and G2 with the duty cycle and period calculated by the voltage regulator and the frequency selection block (Dreg and Tselec, respectively)
Summary
Renewable energies, energy recovery systems, power electronic transformers, DC distribution grids, and smart grids [1,2,3,4,5,6] are some examples of current topics related to power electronics. By means of the adequate design of the cells of multilevel converters (with a cell voltage usually around 1 kV), it is possible to integrate low voltage DC or AC power sources (such as wind turbines or photovoltaic panels), loads or energy storage systems at the cell level [9,10,11]. A power converter designed to integrate batteries at the cell level in a multilevel converter must withstand high voltage, while at the same time providing high efficiency (Figure 1). SiC MOSFETs and a variable switching frequency control technique providing zero voltage switching (ZVS) have been used to improve efficiency in a synchronous boost converter while taking into account. DC/DCconverter converterconnected connectedinincascade cascade[13] These days, days,most mostofofthe thehigh-power high-power converters developed digitally controlled, providing.
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