Study on Driving Technology of Piezoelectric Solid-State Micro Gyroscope

2013 ◽  
Vol 278-280 ◽  
pp. 817-820
Author(s):  
Yong Song He ◽  
Xiao Sheng Wu ◽  
Fu Zheng ◽  
Wen Yuan Chen ◽  
Wei Ping Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Resonance Frequency ◽  
Closed Loop ◽  
Phase Lock Loop ◽  
Open Loop ◽  
Reference Voltage ◽  
Driving Voltage ◽  
Noise Compensation ◽  
Piezoelectric Solid ◽  
Driving Circuit

In order to compensate the noise brought by piezoelectric gyroscope or external environment and track the resonance frequency, Closed Loop Driving Circuit (CLDC) of piezoelectric solid-state micro gyroscope is proposted in the paper which will stabilize the driving voltage value and keep the resonance frequency tracked. CLDC mainly contains Phase Lock Loop (PLL) circuit, Automatic Gain Circuit (AGC). Experimental results show that the fluctuation of reference voltage is within ±7mv, while the fluctuation of reference voltage in Open Loop Driving Circuit (OLDC) without noise compensation is ±23mv. The frequency of CLDC drifts within 0.03 kHz with the resonance frequency of 357.9 kHz while the OLDC can’t track any drifting.

scholarly journals Piezoelectric MEMS Resonators for Cigarette Particle Detection

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 145 ◽  
Author(s):  
Javier Toledo ◽  
Víctor Ruiz-Díez ◽  
Maik Bertke ◽  
Hutomo Suryo Wasisto ◽  
Erwin Peiner ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Closed Loop ◽  
Low Cost ◽  
Open Loop ◽  
Piezoelectric Resonator ◽  
Particle Detection ◽  
Interface Circuit ◽  
Mems Resonators ◽  
Loading Effects ◽  
Working Principle

In this work, we demonstrate the potential of a piezoelectric resonator for developing a low-cost sensor system to detect microscopic particles in real-time, which can be present in a wide variety of environments and workplaces. The sensor working principle is based on the resonance frequency shift caused by particles collected on the resonator surface. To test the sensor sensitivity obtained from mass-loading effects, an Aluminum Nitride-based piezoelectric resonator was exposed to cigarette particles in a sealed chamber. In order to determine the resonance parameters of interest, an interface circuit was implemented and included within both open-loop and closed-loop schemes for comparison. The system was capable of tracking the resonance frequency with a mass sensitivity of 8.8 Hz/ng. Although the tests shown here were proven by collecting particles from a cigarette, the results obtained in this application may have interest and can be extended towards other applications, such as monitoring of nanoparticles in a workplace environment.

A low-noise readout interface for silicon MEMS vibratory gyroscope

2020 ◽  
pp. 2150069
Author(s):  
Xiaowei Liu ◽  
Dongliang Chen ◽  
Keguan Song
Keyword(s):  
Closed Loop ◽  
Open Loop ◽  
Low Noise ◽  
Driving Frequency ◽  
Noise Performance ◽  
Zero Bias ◽  
Vibratory Gyroscope ◽  
Noise Optimization ◽  
Bias Instability ◽  
Driving Circuit

This paper proposes a novel readout interface for a high-precision silicon MEMS vibratory gyroscope. The readout interface contains a closed-loop self-resonating driving circuit and a low-noise open-loop capacitance sensing circuit. In order to achieve an overall optimization in noise performance, the noise in driving loop of the interface is analyzed in detail. After the noise optimization, the driving frequency stability achieves 0.93 ppm, the front-end capacitance resolution achieves 0.002 [Formula: see text]. The total zero bias instability achieves [Formula: see text]/h, and angle random walk (ARW) achieves 0.014[Formula: see text]/s/[Formula: see text].

Closed loop driving and detect circuit of piezoelectric solid-state micro gyroscope

2013 ◽  
Vol 20 (2) ◽  
pp. 185-191 ◽  
Author(s):  
Yongsong He ◽  
Xiaosheng Wu ◽  
Fu Zheng ◽  
Wenyuan Chen ◽  
Weiping Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Closed Loop ◽  
Piezoelectric Solid

scholarly journals Grid Stability Analysis with LCL Filter using 1-phase Inverter

2020 ◽  
Vol 8 (5) ◽  
pp. 4435-4441
Keyword(s):  
Solid State ◽  
Natural Resources ◽  
Closed Loop ◽  
Function Analysis ◽  
Dynamic Control ◽  
Open Loop ◽  
Lcl Filter ◽  
Phase Inverter ◽  
Transfer Function Analysis ◽  
The Stability

The demand for power generation is increased day to day due to increase of industrial loads as well as domestic loads like machines, air conditioners,etc.This will lead to increase of utilization of natural resources. Whenever natural resources with solid state devices interfaced with grid, the stability of the grid will become an important issue. So the additional use of LCL filter will lead to protect the stability of the grid along with its closed loop dynamic control. In this paper the grid stability is analyzed using LCL filter with 1-phase inverter in open loop as well as closed loop. Different LCL configurations along with transfer function analysis are also proposed in this paper. Interfacing of renewable sources with solid state non linear switching devices cause the harmonics and other disturbances on the grid. The LCL filter will reduce these harmonics and increase the quality of the grid. The application of LCL filter for weak grids is very significant in the sense of stability..

On closed-loop equilibrium strategies for mean-field stochastic linear quadratic problems

2020 ◽  
Vol 26 ◽  
pp. 41
Author(s):  
Tianxiao Wang
Keyword(s):  
Optimal Control ◽  
Closed Loop ◽  
Optimal Control Problems ◽  
Mean Field ◽  
Open Loop ◽  
Time Inconsistency ◽  
Control Problems ◽  
Linear Quadratic ◽  
Linear Quadratic Optimal Control ◽  
Equilibrium Strategies

This article is concerned with linear quadratic optimal control problems of mean-field stochastic differential equations (MF-SDE) with deterministic coefficients. To treat the time inconsistency of the optimal control problems, linear closed-loop equilibrium strategies are introduced and characterized by variational approach. Our developed methodology drops the delicate convergence procedures in Yong [Trans. Amer. Math. Soc. 369 (2017) 5467–5523]. When the MF-SDE reduces to SDE, our Riccati system coincides with the analogue in Yong [Trans. Amer. Math. Soc. 369 (2017) 5467–5523]. However, these two systems are in general different from each other due to the conditional mean-field terms in the MF-SDE. Eventually, the comparisons with pre-committed optimal strategies, open-loop equilibrium strategies are given in details.

Comparison of Dc-Dc SEPIC, CUK and Flyback Converters Based LED Drivers

2020 ◽  
pp. 99-107
Author(s):  
Erdal Sehirli
Keyword(s):  
Integrated Circuit ◽  
Closed Loop ◽  
Input Voltage ◽  
Open Loop ◽  
Current Sensor ◽  
Switching Frequency ◽  
Led Driver ◽  
Advantages And Disadvantages ◽  
Led Drivers ◽  
Conduction Mode

This paper presents the comparison of LED driver topologies that include SEPIC, CUK and FLYBACK DC-DC converters. Both topologies are designed for 8W power and operated in discontinuous conduction mode (DCM) with 88 kHz switching frequency. Furthermore, inductors of SEPIC and CUK converters are wounded as coupled. Applications are realized by using SG3524 integrated circuit for open loop and PIC16F877 microcontroller for closed loop. Besides, ACS712 current sensor used to limit maximum LED current for closed loop applications. Finally, SEPIC, CUK and FLYBACK DC-DC LED drivers are compared with respect to LED current, LED voltage, input voltage and current. Also, advantages and disadvantages of all topologies are concluded.

scholarly journals Parallel Point Clouds: Hybrid Point Cloud Generation and 3D Model Enhancement via Virtual–Real Integration

2021 ◽  
Vol 13 (15) ◽  
pp. 2868
Author(s):  
Yonglin Tian ◽  
Xiao Wang ◽  
Yu Shen ◽  
Zhongzheng Guo ◽  
Zilei Wang ◽  
...  
Keyword(s):  
Point Cloud ◽  
Closed Loop ◽  
Real Data ◽  
Point Clouds ◽  
Autonomous Driving ◽  
Training Model ◽  
Labor Cost ◽  
Open Loop ◽  
Training Dataset ◽  
Data Annotation

Three-dimensional information perception from point clouds is of vital importance for improving the ability of machines to understand the world, especially for autonomous driving and unmanned aerial vehicles. Data annotation for point clouds is one of the most challenging and costly tasks. In this paper, we propose a closed-loop and virtual–real interactive point cloud generation and model-upgrading framework called Parallel Point Clouds (PPCs). To our best knowledge, this is the first time that the training model has been changed from an open-loop to a closed-loop mechanism. The feedback from the evaluation results is used to update the training dataset, benefiting from the flexibility of artificial scenes. Under the framework, a point-based LiDAR simulation model is proposed, which greatly simplifies the scanning operation. Besides, a group-based placing method is put forward to integrate hybrid point clouds, via locating candidate positions for virtual objects in real scenes. Taking advantage of the CAD models and mobile LiDAR devices, two hybrid point cloud datasets, i.e., ShapeKITTI and MobilePointClouds, are built for 3D detection tasks. With almost zero labor cost on data annotation for newly added objects, the models (PointPillars) trained with ShapeKITTI and MobilePointClouds achieved 78.6% and 60.0% of the average precision of the model trained with real data on 3D detection, respectively.

scholarly journals Converting MST to TSP Path by Branch Elimination

2020 ◽  
Vol 11 (1) ◽  
pp. 177
Author(s):  
Pasi Fränti ◽  
Teemu Nenonen ◽  
Mingchuan Yuan
Keyword(s):  
Spanning Tree ◽  
Closed Loop ◽  
Minimum Spanning Tree ◽  
Travelling Salesman Problem ◽  
Open Loop ◽  
Travelling Salesman ◽  
Elimination Algorithm ◽  
Number Of Iterations ◽  
Number Of Branches

Travelling salesman problem (TSP) has been widely studied for the classical closed loop variant but less attention has been paid to the open loop variant. Open loop solution has property of being also a spanning tree, although not necessarily the minimum spanning tree (MST). In this paper, we present a simple branch elimination algorithm that removes the branches from MST by cutting one link and then reconnecting the resulting subtrees via selected leaf nodes. The number of iterations equals to the number of branches (b) in the MST. Typically, b << n where n is the number of nodes. With O-Mopsi and Dots datasets, the algorithm reaches gap of 1.69% and 0.61 %, respectively. The algorithm is suitable especially for educational purposes by showing the connection between MST and TSP, but it can also serve as a quick approximation for more complex metaheuristics whose efficiency relies on quality of the initial solution.

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