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Conventional CMOS technology provides a lot of opportunities in the field of electronics device. But presently, carbon nanotube field effect transistor (CNTFET) is a new technology for the application in the field of electronic device. Due to the limitation of the size of CMOS, CNTFETs are the promising substitute due to its nano scale size. CNTFET also shows the high stability, low power circuit...
The purpose of this paper is to present a multi-inverter control technique to achieve fast dynamics and current sharing. The system is designed for back-up power system applications, especially for base station, etc. The multi-inverter system consists of one master module and several slave modules. The master module is with voltage and current control. The voltage controller is with proportional and...
In this paper, a simple variable integral gain PI controller for a single-phase Inverter is presented. The controller is based on a conventional PI by adding a rule of Fuzzy Logic Control (FLC), the complete mathematical model is derived. Compared with the conventional PI controller, the integral gain of the proposed controller can be adjusted online. The efficacy and feasibility of the proposed methods...
This paper presents a Resolution Adaptive Flash A/D Converter design and its performance. To achieve high speed, the proposed A/D converter utilizes Threshold Inverter Quantization technique replacing conventional analog comparators with digital comparators. The replacement results in a faster digital conversion and a reduction of the analog nodes in the ADC. The proposed ADC is a true variable resolution...
In this paper, a control technique is developed for parallel inverters with no control interconnections in microgrid. The proposed control technique, based on droop control method and virtual impedance method, uses only locally measurable feedback signals to make some of the parallel inverters supply only reactive power equally for loads while the others share only active power. Simulation results...
The effect of the connection cable impedance on the performances of individual inverter and multi-inverter parallel system is analyzed based on the small signal model. The theoretical analysis and the simulated results show that the cable impedance has little impact on the individual inverter performance, but it has great effect on the multi-inverter parallel system, even it may result in instability...
Unstable problem of PMSM current control system in the overmodulation range of an inverter is a well known problem, however, the cause and mechanism of this problem are still not investigated well. Actually, the main reasons which are large amount of harmonic components and voltage saturation of an inverter in this range are already known. However, the effects from current controller such as PI controller...
The implementation of complex functionality in low-power nano-CMOS technologies leads to enhance susceptibility to parametric disturbances (environmental, and operation-dependent). The purpose of this paper is to present recent improvements on a methodology to exploit power-supply voltage and temperature variations in order to produce fault-tolerant structural solutions. First, the proposed methodology...
A planar edge termination technique of trenched field limiting ring is investigated by using 2-dimensional numerical analysis and simulation. The better voltage blocking capability and reliability can be obtained by trenching the field-limiting ring site which would be implanted. The trench etch step makes the junction depth deeper so that junction curvature effect and surface breakdown are less happened...
This paper introduces a novel current sense amplifier (CSA) in sub-32nm fully depleted (FD) double-gate (DG) silicon-on-insulator (SOI) technology with planar independent self-aligned gates. A new architecture is proposed which takes advantage of the back gate in order to improve circuit properties. Compared to the reference circuit, the new architecture proves to be faster (21% sensing delay decrease),...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
In this paper, a 12-bit 50MHz Pipelined Low-Voltage ADC is presented, which consists of 8-stage-pipelined low resolution ADCs and a 4-bit flash ADC. Several critical technologies are used to guarantee the resolution and high sampling and converting rate such as 1.5bits per stage conversion, digital correction logic, gain-boosted telescopic OTA and so on. Finally the whole system is taped out in SMIC...
This paper proposes a novel Z-source dc-dc converter topology. Compared to the existing dc-dc converter circuits, they can reduce in-rush and harmonic current, provide larger range of output dc voltage and improve reliability. It can operate in voltage-fed and current-fed when the place of the source and load is exchanged each other, and it can be perform buck-boost function in these two conditions...
DC injection is a critical issue in the distributed generation systems according to IEEE Std. 1547-2003. Unfortunately, few literatures discuss this problem. In this paper, a novel control strategy is proposed to achieve zero steady-state DC injection. The proposed idea stems from a well-known fact that a capacitor can block DC component naturally. Generally, this capacitor should be large enough...
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