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In this paper, a method to synchronize the carrier wave of parallel three-phase inverters without communication is proposed. This method is based on the digital-based virtual dead-zone oscillators coupled with each other through electrical connections between parallel inverters. These oscillators are synchronized based on the phenomenon of synchronization in networks of coupled oscillators. Thus,...
This paper presents the influence of switching frequency on the dual active bridge (DAB) dc-dc converter on the power transmission characteristics and the soft switching realization. Based on this, a switching frequency optimization of dual phase shift control is proposed to realize ZVS over the whole load range. It is an optimization of the PWM plus phase-shift control, which can reduce switching...
There are circulating currents among the parallel inverters. Based on the existing researches on circulating currents, an accurate model of switching frequency circulating current is proposed in this paper. Moreover, the relationships between the circuit parameters and switching frequency circulating current are investigated and analyzed in detail. Based on the analytical results, favorable design...
In this paper, the detailed analysis and design for DC-AC buck inverter with sliding mode control is presented. As the new inverter is composed of two independent current bi-directional buck converters, the sliding mode controller is analyzed by an equivalent circuit. The design of the sliding surface coefficient is analyzed according to its relationship with the dynamic response of the system, the...
This paper proposed an improved digital control algorithm of power factor preregulators (PFP) to reduce the CPU time requirement. One main problem to implement digital control for PFP is the limited switching frequency due to limited DSP speed. The new digital PFP control method avoids the complex calculations for the duty cycles needed in the conventional methods. Based on the improved algorithm,...
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