121 X SIMPOZIJUM Energetska elektronika 10 th SYMPOSIUM on Power Electronics Novi Sad, Yugoslavia, 14.-16. 10. 1999. Ee'99 A SIMPLE CONTROL CIRCUIT FOR DUAL BOOST RECTIFIER PROVIDING SINUSOIDAL INPUT CURRENTS Predrag Pejović Faculty of Electrical Engineering, Belgrade, Yugoslavia Abstract: In this paper, a novel circuit utilized to generate reference signals for current programming in the three-phase dual boost harmonic-free rectifier is proposed. The circuit is characterized by simplicity and by excellent rejection of zero-sequence harmonic components of the input voltages. Optimal current programming is provided. Analytically obtained results are verified on a 1.5kW rectifier. Keywords: Converter control /Harmonic /Power factor correction /Power quality /Three phase systems 1. INTRODUCTION A three-phase high power factor rectifier proposed in [1] is analyzed in this paper. The rectifier provides near sinusoidal input currents and regulated output voltage applying two boost converters and the current injection. Zero-current switching resonant version of the rectifier is proposed in [2], and the topology is compared to other three-phase high power factor rectifiers in [3]. The rectifier is particularly suitable for application in cases where a voltage-adjustment transformer is applied at the rectifier input. In these cases, the current injection device [4] is not necessary, and the current injection can be provided injecting the current in the transformer secondary neutral point. Current programming in the rectifier is analyzed in [5], and it is shown that ideally sinusoidal waveforms of the input currents could be obtained applying proposed optimal current injection. In this paper, a simple circuit for generation of the reference signals for the optimal current programming is proposed. The circuit provides excellent rejection of zero-sequence components of the input voltages that significantly influence effects of the current shaping in other methods of the reference-signal generation. 2. THE RECTIFIER STRUCTURE The rectifier analyzed in this paper is presented in Fig. 1, and it consists of two boost converters utilized to shape the input currents and to regulate the output voltage. Low distortions of the input currents are obtained applying the current injection technique, which requires a current injection device [4], with a volt-ampere rating of about 20% of the rectifier power, or an insulating transformer at the rectifier input. This Paper No. T1-3.2, pp. 1-6