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Power supplies used on the electric power environment test process for electronic products and audio-amplifiers are required to generate arbitrary ac voltage waveforms in the wide frequency range. Traditionally, analogue amplifier technologies have been used for those application even though those have the disadvantages of low-efficiency, bulky in volume, and heavy in weight. Recently, however, research on the arbitrary waveform power generator becomes to be attractive among power electronics engineers, because the audio amplifiers utilizes the D-Mode switching technologies have been move into the market. This paper presents an arbitrary ac power generator utilizes a novel instantaneous waveform control method for a single-phase voltage source PWM inverter. Fig. 1 shows the proposed system. Table 1 shows the circuit parameters. Switching frequency is set to 14 kHz. A main circuit is composed by a general single-phase voltage source PWM inverter with output LC filter. A remarkable feature of this study is the control circuit that an adaptive frequency lossless resonator based on a rotation frame transformation and a command generator on the rotation frame are used. The proposed filter can suppress the resonance caused by the LC filter, and hence it enables to generate an arbitrary ac voltage waveforms like a triangular voltage waveform or a rectangular voltage waveform without overshoot or oscillation. The command generator generates both an instantaneous frame angle and accurate voltage commands on the rotating frame from an single-phase analogue signal. Fig. 2 shows the experimental results when a triangular voltage waveform and a rectangular voltage waveform is generated through 500 W experimental set-up. Although the damping coefficient is set to 0.27, the experimental results show that arbitrary ac voltage waveforms can be accurately generated with small control error, vr − vo. Table 1. Parameters

A Generation Control of Arbitrary AC Waveforms for the Single-phase Voltage Source PWM Inverter Utilizing an Adaptive Frequency Loss-less Resonator