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This paper describes a soft‐switching interleaved power factor correction (PFC) converter with a lossless snubber. AC–DC converters require a unity input power factor characteristic with highly efficient operation to prevent the inflow of harmonic current to the power source. The proposed PFC converter improves the input current ripple with interleave control. The converter realizes a high efficiency...
This paper proposes a current compensation method for current reconstruction from a DC-link current sensor. The method has region in which phase current reconstruction is difficult. To solve this problem, voltage reference and carrier compensation methods have been proposed. However, these methods increase the phase current harmonics. This paper proposes a current compensation method that uses the...
An AC servomotor is operated by current sensors. Owing to cost implications, it is often operated by an inverter system based on single DC-link current sensor. However, a current sensor sometimes has offset and gain variation caused by secular and thermal variation. When surface permanent magnet synchronous motor (SPMSM) drive system has the offset and the gain variation of current sensor, SPMSM has...
This paper describes a soft-switching-interleaved power factor correction (PFC) converter. The proposed PFC converter reduces the input-current ripple by using an interleave-control method and realizes high efficiency through the soft-switching operation of all switching devices, without requiring a large auxiliary resonant circuit. In order to confirm that the proposed converter achieves soft-switching...
This paper proposes a new output voltage control for inverter system which contains time-delay and nonlinear load. In the next generation X-ray CT system with the contactless power transfer method, the feedback signal often contains some long delay time by AD/DA conversion and error detection/correction time. When the PID controller of inverter system has the harmful influence on the time-delay, it...
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