V39-29 - World Academy of Science Engineering and T Feed-Forward Control in Half-Bridge Resonant DC Link Inverter Apinan Aurasopon and Worawat

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Abstract— This paper proposes a feed-forward control in a half- bridge resonant dc link inverter. The configuration of feed-forward control is based on synchronous sigma-delta modulation and the half- bridge resonant dc link inverter consists of two inductors, one capacitor and two power switches. The simulation results show the proposed technique can reject non-ideal dc bus improving the total harmonic distortion. Keywords Feed-forward control, Resonant dc link inverter, Synchronous sigma-delta modulation. I. INTRODUCTION HE dc bus voltage of resonant link converter techniques is resonated by an LC network and power switches. The oscillation of this network gives rise to instants of zero voltage. Therefore, the output power switches are connected to the network such that switching occurs at such zero crossing, and then switching losses are significantly reduced [1]. However, the resonant dc link system operates well under condition of an ideal dc bus (ripple-free) obtained by means of a passive dc link filter. To achieve a very low ripple, however, requires large filters. This increases the cost, size, and weight and reduces the overall efficiency of the conversion process. Furthermore, in a practical converter system, it is difficult to realize an ideal dc bus for a number of practical constraints. Most of the dc bus converter systems use a front-end diode bridge for ac–dc rectification. The ripple in the dc bus is undesirable, as it causes low-order harmonics appearing in the inverter output. These harmonics are difficult to filter out and cause deterioration in the quality of the output voltage. This paper therefore proposes a feed forward control using synchronous sigma-delta modulation (SSDM) configuration. This control technique is used to control the new configuration of half-bridge resonant dc link (HB-RDCLI). The features of the proposed pattern generator are highlighted. The simulation results show the ripple rejection capability of the proposed control technique. II. RESONANT DC LINK EQUIVALENT CIRCUIT Fig. 1 shows the resonant dc link equivalent circuit. The switch Ms is turned on by the short pulse to provide initial condition of inverter operation. When Ms is opened, the dc Apinan Aurasopon and Worawat Sa-ngiavibool Faculty of Engineering, Mahasarakham University, Kantharawichai district, Mahasarakham 44150, Thailand (phone: +6645-754321; fax: +6645-754316; e-mail: [email protected]). bus oscillates and returns to zero generating, ) ( t v d , where upon Ms is turned again. Then, this process can be repeated. So, it is possible that the power switches of inverter circuit can operate at high frequency rate without switching losses if they are turned on and turned off at zero crossing of ) ( t v d . Therefore, the well-established modulation techniques such as
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This note was uploaded on 08/22/2011 for the course EEE 230 taught by Professor Subramanian during the Spring '07 term at University of California, Berkeley.

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V39-29 - World Academy of Science Engineering and T Feed-Forward Control in Half-Bridge Resonant DC Link Inverter Apinan Aurasopon and Worawat

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