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Based on analysis of sources of the noise of switched reluctance motor (SRM), the paper puts forward methods to reduce noise in terms of torque ripple and phase change from the point of control view. In the low speed stage, phase current closed-loop segmented according to the sine and cosine curve, maintain a constant torque to reduce the torque ripple. Put forward soft turn-off method at the time...
NBTI and RTN time-dependent variability is described from a defect-centric perspective. It is shown that NBTI induced threshold voltage shift (ΔVTH) distribution is governed by a compound Exponential-Poisson process. Using the memoryless properties of Poisson statistics, it is shown that not only the stressed but also the relaxed fraction follows the Exponential-Poisson distribution. Moreover, the...
The high frequency voltage oscillation on the DC/DC gate driver of a H-bridge created during the turn-off intervals of the power switches has critical impact on component reliability and control quality. This noise can propagate freely in the low power plane to other functional circuits of the converter due to the performance degradation of EMI filter in high frequency range above 30MHz. In this paper,...
In spite of many exclusive advantages of the switched reluctance motor (SRM), acoustic noise of this motor is high and it is necessary to do more research on the noise reduction which is the main objective of the present paper. The noise reduction procedure proposed here is included three separate parts: (1) stator design parameters optimization, (2) rotor pole design shape optimization and (3) inserting...
A low noise and wide tuning range integrated phase-locked loop (PLL) was proposed. Besides careful design of the low noise and wide tuning range voltage-controlled oscillator, a large loop bandwidth was chosen to suppress the phase jitter contributed by the voltage-controlled oscillator. In addition, a charge pump capable of improving the switching time mismatch and the dynamic current mismatch was...
CT saturation is a phenomenon that can cause inaccurate fault current measurement and may result in related protective relay failure to block the high current flow under a fault condition in a power system. Hence, it is required to develop a method to detect occurrence of CT saturation with a good accuracy under presence of noise in a power system. In this paper, a new method having the afore-mentioned...
Oscillations in power electronic circuits with fast switching semiconductors are commonly known and the corresponding parasitic elements have been investigated in multiple literature. However, this paper investigates the triggering of these electromagnetic interference (EMI)-critical oscillations. An analytical description is derived using a boost converter circuit. Based on this description an optimization...
This paper proposes a soft switching type dc-dc converter. To suppress noise levels, reformed delta-sigma modulation circuit is introduced. To reduce switching loss, the proposed converter also introduces soft switching technique.
In this paper, the leader-following consensus of multi-agent system in noisy environment under fixed and switching topology is investigated. Based on the optimal regulator, a distributed consensus controller is designed, using the stochastic analysis and algebraic graph theory, a sufficient condition that under which the consensus error (disagreement vector) can be exponentially stable in mean square...
The analytical noise model of HgCdTe focal plane array (FPA) pixel based on capacitive transimpedance amplifier (CTIA) is presented. It allows to evaluate the noise-equivalent power (NEP) and input dynamic range (IDR) of short-wavelength infrared HgCdTe FPA. The noise model takes into account the following noise mechanisms: photodiode shot noise due to fluctuations of the radiation flux and dark current,...
In this paper, we propose a new switching median filter with signal dependent thresholds designed by a genetic algorithm (GA). The switching median filter detects noise-corrupted pixels based on a threshold. Then it restores only the detected pixels. The present switching median filter deals with the random-valued impulse noises, whose distribution is ideally assumed as a uniform distribution. In...
This paper investigates various random PWM (RPWM) techniques for conventional two-level inverter-fed traction drives and proposes a discrete RPWM technique for acoustic noise reduction. The proposed RPWM technique randomizes within a set of predefined switching frequencies compared with the continuous nature of randomization in conventional RPWM techniques. The proposed method was compared with conventional...
The combination of deadbeat controller and open-end winding topology is effective for improving the response of current control of induction motor drive system. A deadbeat current controller achieves high gain by compensating the delay element of digital controller with current prediction and excluding it from the control loop. The response of a deadbeat current controller depends on the duration...
Recent control theoretic studies have shown that the sharing of electronic control unit (ECU) bandwidth among multiple controllers can be adaptively regulated to achieve better control performance as opposed to static bandwidth allocation to each controller. Unfortunately the ideal controllers cannot always be implemented, since the computational platform does not admit unrestricted choice of sampling...
This paper proposes a direct rotor-position estimation method for IPMSMs (Interior Permanent Magnet Synchronous Motors) in low-speed regions including standstill. Proposed estimation method does not require phase-locked-loop (PLL) which degrade the response of position estimation and it can improve the response of position estimation.
Increasing the voltage in aircraft applications may induce reliability problems associated to the occurrence of partial discharges (PD) in systems. Moreover, the specificities of both the environmental conditions (temperature, pressure, relative humidity …) and of the harsh electrical conditions (high voltage, high frequency, high dV/dt …) contribute to the risk of partial discharges. This paper describes...
This paper introduces a novel low-power Ion-Sensitive Field Effect Transistor (ISFET) readout configuration compatible with standard CMOS technology that utilizes chopping technique to reduce the 1/f noise and the offset of the readout circuitry. In addition, the proposed scheme tackles the well-known non-idealities of the ISFET such as the trapped charge and the long-term drift by using a resetting...
Chopper stabilization is the most widely used circuit technique to reduce the influence of the flicker noise in an amplifier. Recently, observation of /ƒ2 input-referred noise in the chopper amplifier with a high-impedance input source was reported. However, the mechanism of this /ƒ2 phenomenon has not been completely analyzed. This paper provides the complete analysis of the noise influence generated...
Aside from the benefits it brings, 3D-IC technology inevitably exacerbates the difficulty of power delivery with volumetrically increasing power consumption. Recent work managed to “recycle” current within the 3D stack by linking the different layers' supply/ground nets into a series connection. This charge-recycled (also known as voltage-stacked, or V-S) scheme provides a scalable solution for 3D-IC's...
Discovering an efficient representation that reflects the structure of a signal ensemble is a requirement of many Machine Learning and Signal Processing methods, and gaining increasing prevalence in sensing systems. This type of representation can be constructed by Convolutive Non-negative Matrix Factorization (CNMF), which finds parts-based convolutive representations of non-negative data. However,...
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