Advanced Materials Research Vols. 732-733

Abstract: The insulating-gate bipolar transistor, IGBT, is a power component which is developed in the medium power and medium frequency. It inherently integrates the structures of a power bipolar transistor and a power MOSFET, and then it has better performance in many applications. Advantages of this device are the high current density, the outstanding breakdown voltage, as well as the excellent operating frequency and so on. And, it might make up the shortcoming of MOSFETs or BJTs utilized separately. In this paper, a smart IGBT device is developed by using the semiconductor process and device simulation tools. Therefore, a relationship between the depth of drift region, doping concentration, and breakdown voltage in an IGBT will be investigated in this work. Eventually, this device will be with the 200V breakdown voltage and 20A on-state driving current capability. Meanwhile, the ESD and latch-up (LU) protection structures will be accomplished in this study.

Abstract: In this paper, we propose a novel high-voltage (HV) nLDMOS transistor with a small R_on resistance, low trigger voltage (V_t1) and high holding voltage (V_h) characteristics. Here, we introduce a deep N⁺-buried-layer (NBL) into this HV nLDMOS to evaluate the ESD/latch-up (LU) parameters variation. These electric snapback parameters affect the reliability of proposed device and its performance. Eventually, we expect this proposed HV stucture processed better characteristic behaviors, which can be applied to the power electronics and ESD protection application of HV ICs.

Abstract: The propulsion system of ultralight electric aircraft is one of the general aviation technology development directions. It has the advantages such as light pollution, low noise, high energy utilization ratio, simple structure, easy maintenance, high reliability, less heat radiation, little operation cost and so on. Combined with the certain type of ultralight aircraft design parameters, the layout of aircraft electric propulsion, the principles and steps of the parameter matching of electric propulsion system were presented. The method of parameter matching and performance verification of electric propulsion system was put forward. The feasibility of the system is verified from the point of dynamic property. The study of parameter matching of electric propulsion system could not only provide basis for the integrated optimization for electric power system, but also evaluate the performance of the system simulation as reference.

Abstract: To improve the response characteristic of the VSC in SMES (Superconducting Magnetic Energy Storage) with wide load disturbance, a new square of voltage out-loop based feedback linearization control strategy is proposed for the control of VSC. The input variable was controlled by a combining of square of voltage out-loop based direct voltage control and current inner-loop control to achieve fast stabilization of DC bus voltage and accurate tracking of power of PCC. Stability and dynamic response characteristics of the system were verified by simulation results. It is shown that the proposed strategy can improve the DC bus voltage transient response with load step change, with simplified control variable expression and reduced calculating burden.

Abstract: An ANFIS (Adaptive neuro-fuzzy inference system) controller which bases on Takagi-Sugenos method and combines the advantages of neural controller and fuzzy multi-variable controller has been studied and developed for the real-time control of EGR and VGT in a diesel engine. In the AVL-BOOST and Matlab/Simulink co-simulation environment, the control performance of ANFIS controller has been compared with those optimal control strategies based on a fuzzy logic controller. Results show the new controller can have more active control to EGR position and the optimal emission levels can be maintained.

Abstract: The ECU development is an extremely complex process. It includes multiple steps and tasks: modular-oriented modeling, auto code generation, ECU flash, calibration and so on. The configuration and function of MotoTron-based rapid prototyping development platform are introduced. The control function finally meets the basic requirements of engine control.

Abstract: Universal Exhaust Gas Oxygen (UEGO) Sensor is one of the most important sensors for the close-loop air-fuel-ratio control system of automobile engine. Due to its special structure, controller is used to control sensors temperature so that UEGO sensor can work normally. Aiming at nonlinear characteristic of the temperature control module, a subsection heating control method and a PID algorithm is studied. UEGO heating controller is implemented by means of Motohawk real time simulation system. Experimental results show that under the condition of different temperature, the UEGO is also able to maintain the best working temperature.

Abstract: In order to enhance automaticity of inverter efficiency test, an inverter efficiency test system developed with LabVIEW software is designed. the test system can realize the communication between computer and programmable DC power supply via GPIB, and can complete parameter settings and output control of DC power supply. Eventually, output control of inverter is reachable. An experimental verification has been done, which shows that this system runs stably, and certain practicability is available.

Abstract: Distributed renewable energy connected to the power grid in the form of micro-grid, which makes a great impact on the power quality of the grid. Active Power Filter (APF) is a kind of effective device, which can improve the power supply quality and purify the power pollution. It‘s particularly significant to improve the APF’s performance. Based on the selective harmonic current control strategy, which is used to solve the problem, that the main times of the harmonic current is not sufficiently compensated, this paper considers to adopt the LCL filter on the grid-side to further improve the compensation performance of active power filter. This improvement can reduce the high frequency harmonics caused by the way of PWM high frequency modulation. Finally a case study simulated by PSIM software verifies the superiority of the proposed measure.

Abstract: The grid-connected inverters required for distributed generation systems should have high reliability. However, a shoot-through problem, which is a major killer of the reliability of the inverters, exists in the conventional bridge-type voltage-source inverters. In order to solve the aforementioned problem, a non-isolated buck-boost grid-connected inverter with no shoot-through problem is proposed. The hysteresis current control is used. The output voltage of the proposed grid-connected inverter can be larger or lower than the input voltage. The operating principle is illustrated. Simulation verifies the theoretical analysis.