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In paralleled inverters UPS system, Virtual impedance is applied widely in inverter to decouple the active power and reactive power of inverter and improve the power average sharing accuracy. Proper virtual impedance also can estimate the circulating currents resulted from the asymmetric parameters of different inverter modules. In practical paralleled inverters system, when one inverter prepares...
Due to the disadvantages of lower input power factor, high harmonics and switching loss in the conventional switching mode power supply, a high-power-factor switching mode power supply is presented. The principle of active power factor correction is analyzed. The resonant stage of soft-switching is studied. The experimental circuits are realized. The experimental results show that the input current...
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