An Improved Closed-Loop Switched Capacitor Capacitance-to-Frequency Converter and Its Evaluation

2018 ◽  
Vol 67 (5) ◽  
pp. 1028-1035 ◽  
Author(s):  
Vijayakumar Sreenath ◽  
Boby George
Keyword(s):  
Closed Loop ◽  
Frequency Converter ◽  
Switched Capacitor ◽  
Capacitor Capacitance

Reasoning of the Use of TVR-IM Electric Drives of Closed-Loop Type by the Angular Velocity Observer for Solving Technological Problems

2014 ◽  
Vol 698 ◽  
pp. 131-135 ◽  
Author(s):  
V. Timoshkin ◽  
A. Glazyrin ◽  
L. Kozlova
Keyword(s):  
Angular Velocity ◽  
Electric Drive ◽  
Closed Loop ◽  
Frequency Converter ◽  
Electric Drives ◽  
Advantages And Disadvantages ◽  
Velocity Observer

This article describes the main advantages and disadvantages of electric drive TVR-IM compared with a frequency converter. The necessity to use electric drives TVR-IM and angular velocity observers to solve technological problems is substantiated. Promising directions in the field of constructing closed-loop by the speed observer systems TVR-IM are shown.

Applied Research on the Closed-Loop Control of Oil Production System with Progressing Cavity Pump

2012 ◽  
Vol 248 ◽  
pp. 119-123
Author(s):  
Duan Yin Zhu ◽  
Jian Ning Xu ◽  
Yan Xiong Gao ◽  
Wen Jie Lv
Keyword(s):  
Production System ◽  
Closed Loop ◽  
Frequency Conversion ◽  
Rotation Speed ◽  
Frequency Converter ◽  
Dynamic Change ◽  
Oil Production ◽  
Closed Loop Control ◽  
Loop Control ◽  
Highly Efficient

It aimed to dynamic change of oilfield productivity, maked sure that the progressing cavity pump is working in a highly efficient region. It combined variable frequency conversion technology and dynamic liquid level height control technology, the closed-loop control of oil production system with progressing cavity pump is made up of rotation-speed and torsion sensor, stepless motor, frequency converter, PLC and progressing cavity pump. The result show that the system can control the pump submergence depth by adjusting the rotation-speed and torsion of polish rod, and make sure the pump working in a highly efficient region finally. This system also can increase recovery efficiency and pump service life.

HIGH-GAIN/EFFICIENCY MULTISTAGE SWITCHED-CAPACITOR-VOLTAGE-MULTIPLIER DC–DC CONVERTER

2012 ◽  
Vol 21 (03) ◽  
pp. 1250023
Author(s):  
YUEN-HAW CHANG
Keyword(s):  
Power Efficiency ◽  
Closed Loop ◽  
Pulse Width Modulation ◽  
High Efficiency ◽  
Conversion Ratio ◽  
Switched Capacitor ◽  
Two Phase ◽  
Analysis And Design ◽  
Voltage Multiplier ◽  
Capacitor Voltage

A closed-loop interleaved multistage switched-capacitor-voltage-multiplier (mc × nc-stage SCVM) dc–dc converter is proposed by combining a variable-conversion-ratio (VCR) and pulse-width-modulation (PWM) control for low-power step-up conversion and high-efficiency regulation. In this SCVM, the power part is composed of two mc-stage SC cells (front) and two nc-stage SC cells (rear) in cascade, and these cells are operated by two-phase nonoverlapping clocks for an interleaved operation with voltage gain of mc × nc at most. This paper presents the VCR control to change the running stage number m,n and topological path for a more flexible and suitable gain level m × n (1 × 1, 2 × 1, 2 × 2, 3 × 1, 3 × 2, 3 × 3,…, mc × nc) according to the desired output so as to improve power efficiency, especially for the lower output. Besides, PWM is adopted not only to enhance output regulation for different outputs, but also to reinforce output robustness to source/loading variation. Further, some theoretical analysis and design include: SCVM model, steady-state analysis, conversion ratio, power efficiency, output ripple, stability, capacitance selection, and control design. Finally, the closed-loop SCVM is simulated, and the hardware is implemented and tested. All the results are illustrated to show the efficacy of the proposed scheme.

scholarly journals An Analytical Approach for Design of a Cross-Connected Fibonacci Switched Capacitor Converter

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 431
Author(s):  
Wanglok Do ◽  
Hassan Bevrani ◽  
Qobad Shafiee ◽  
Kei Eguchi
Keyword(s):  
Analytical Approach ◽  
Equivalent Circuit Model ◽  
Switched Capacitor ◽  
Voltage Gain ◽  
Gain Function ◽  
Magnetic Components ◽  
High Voltage Gain ◽  
Switched Capacitor Converter ◽  
Capacitor Capacitance ◽  
Operation Frequency

Switched capacitor converters (SCCs) are used for low-power applications because they are designed without magnetic components. Among various types of SCCs, the Fibonacci SCC (FSCC) features a small size and high voltage gain. However, the FSCC performance can be more improved, which leads to suggest a cross-connected FSCC (CCFSCC). However, in the considered four-terminal equivalent circuit model for analyzing the CCFSCC, some circuit parameters, such as the operation frequency and capacitor capacitance of the SCC are neglected. In this paper, we propose an analytical approach to optimize the CCFSCC circuit parameters by deriving its voltage gain function. The validity of the addressed methodology is confirmed by comparing the outcomes with the results of simulations and experiments. It is shown that the average errors between the calculated and experimental voltage gains are 9%, and the average absolute errors between the calculated and simulated ones are under 0.1.

Stability Analysis of Switched-capacitor Closed-loop Micro-accelerometers

2013 ◽  
Vol 34 (9) ◽  
pp. 2254-2258
Author(s):  
Zhen-hua Ye ◽  
Hai-gang Yang ◽  
Tao Yin ◽  
Fei Liu
Keyword(s):  
Stability Analysis ◽  
Closed Loop ◽  
Switched Capacitor

A closed-loop switched-capacitor interface for high-quality microaccelerometer

2010 ◽  
Author(s):  
Zhen-hua Ye ◽  
Hai-gang Yang ◽  
Tao Yin ◽  
Yu Wang ◽  
Qi-song Wu ◽  
...  
Keyword(s):  
Closed Loop ◽  
Switched Capacitor ◽  
High Quality
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