2次Δ∑変調インバータにおけるキャリアへの同期化

概要

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The paper describes analytical and experimental studies on a 2nd-order delta-sigma modulated inverter with a carrier signal. Such a system can be interpreted as a triangular-carrier PWM inverter accomodated by a 2nd-order integral feedback control. An accurate waveform and high immunity to disturbances from the power supply can be expected because of a high loop gain due to the integral control. Being synchronized to a high-frequency carrier, the inverter serves as a moter drive with low acoustic noise. The analysis leads to a condition for a high feedback gain and the synchronism to co-exist. Three types of control schemes based on the condition are tested experimentally. Even with the simplest fixed-parameter configuration, a noise level of more than 70dB below the maximal output is recorded over a range including the DC and the carrier frequencies. Disturbance rejection in this system can be improved by about 10dB by a higher-gain control incorporated with on-line adjustment of transfer parameters.
社団法人電気学会の論文