Research On Dual Buck DC/AC Inverter For Application

With the development of the electronic technology, the higher requirement of Power Supply are raised including high efficiency, high power density, low EMI, and rapid dynamic response. A hysteresis-band instantaneous current control PWM technique is popularly used because of its simplicity of implementation, fast current control response, and inherent peak current limiting capability. A novel topology—Dual-Buck inverter is researched comprehensively based on hysteresis-band instantaneous current control; the fundamental operation principle and a novel non-biased half cycle control scheme is given. And at the same time, the results of this experiment are given and the control scheme is proved to be correct. This topology has simple main circuit configuration, freedom from shoot-through problems, simple control scheme and capacity of realizing the optimum design of all power devices. This control scheme is used in a 6KVA three-phase combined inverter. This inverter is made up of three independent single –phase inverters and each inverter can work separately. The scheme shows that it has a good performance even with unsymmetrical load. This paper mainly describes the circuit scheme, operation principle and parameter design of the hysteresis current controlled Dual-Buck inverter,analyses the stiffness and stability of the system.