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The transfer efficiency of WPT system is affected seriously by the AC internal resistance of power coils, the transverse offset and the separation distance between coils. Sometimes the user sets the tolerance of the relatively larger transverse offset as the primary aim, but they never give up high efficiency. This paper theoretically analyzes the effects of the ratio between AC internal resistance...
This paper discusses several sampling signal conditioning circuits for grid-connecting photovoltaic inverter. In this inverter design, the main circuit is isolated with the control parts for safety and anti-interference, therefore all the voltages and currents are sampled by relative sensors. In consideration of the process speed of DSP and the switching period of the inverter, almost all the signal...
This paper researches the electronic ballast based on self-coupled transformer for 70 W high pressure sodium lamp. The original power source comes from the grid, a boost pre-regulator between the input rectifier bridge and the filter capacitor serves unity power factor purpose. A buck topology with the LCpCs resonant circuit, which consists of self-coupled transformer and capacitors, satisfies the...
This paper researches the components and operations of a 10 kW grid-connecting photovoltaic power system and gives 2 whole year yield data and their analyses. The single phase transformerless grid-connecting inverter has two-stage structure, DC-DC and DC-AC, but often operates only with last DC-AC stage according to the panel string output voltage. Apparently, weather is the remarkable influence factor...
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