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Tham khảo tài liệu 'new trends and developments in automotive system engineering part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 10 DC DC Step-Up Converters for Automotive Applications a FPGA Based Approach M. Chiaberge G. Botto and M. De Giuseppe Mechatronics Laboratory - Politecnico di Torino Italy 1. Introduction One emerging application of power electronics is the driving of piezoelectric actuators. These actuators can be used for different kinds of application. They are employed for micro and nano positioning tasks as well as hydraulic or pneumatic valves where they replace magnetic control elements. Piezoelectric actuators have some specific advantages such as high resolution of the displacement excellent dynamic properties and energy consumption near to zero for static or quasi static operations. So high performances low emissions and less fuel consumption bring car designers to adopt new technologies in automotive systems. The use of piezoelectric actuators used as injectors allows less response time with respect to traditional magnetic actuators but requires high driving voltages in order to be driven in a smaller time. This is a big concern in automotive environment where the battery voltage is still the main power source available. A switching amplifier for reactive loads generally consists of two components. A unidirectional DC DC converter with a small input power loads and large buffer capacitor and a second bidirectional DC DC converter that controls the energy exchanged between the buffer capacitor and the reactive load. The requirements on the unidirectional DC DC converter are few. It only needs to compensate the power losses of the two stages plus the energy dissipated in the actuator and the connected mechanical system. Second stage presents more problems because it must be designed for full system power. Conventional DC DC boost converter is not the best solution in piezoelectric based applications where high step-up ratio and high efficiency power conversion is required. The coupled inductor boost converter meets the demanding requirements of these applications .