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Title of the Paper: Energy-Based Closing
Control Towards Contact De-bounce
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Authors: Chieh-Tsung Chi
Abstract: This paper describes the dynamic analysis of contactor system. An ac contactor is modeled and
studied focusing on the problem of energy-dissipated efficiency and contact bounce during closing phase. The
performance of contact bounce is characterized in terms of a set of variables, the velocity and position of
movable part. Afterwards, three cost functions related to the energy dissipation of device are proposed, energy
dissipation of coil resistance, energy dissipation of coil inductance, and the kinetic energy of the movable part.
The aim is to understand the influence of the applied coil voltage for different initial voltage phases on the
contact bounce. The best closing angle for an ac contactor is determined by comparing the kinetic energy
needed for moving the movable part in each closing angle. Since the collision velocity or the moving kinetic
energy of contact is decreased significantly, hence the electric life and the mechanical life of contactor can then
be prolonged and the operating reliability is improved. The validation of the performance of the measurements
was performed by means of simulation and experiment approach. Finally, there are some useful and valuable
results are obtained and presented too.
Keywords: Contactor, Energy, Contact bounce, Initial phase angle, Closing
phase, Movable part, Kinetic energy.
Title of the Paper: GP-based Design and
Optimization of a Floating Voltage Source for Low-Power and Highly Tunable
OTA Applications
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Authors: Maryam Shojaei Baghini,
Rajendra Kanphade, D. G. Wakade Priti Gawande, Manisha Chhangani, Manish
Patil
Abstract: Reuse of analog building blocks is a time consuming process as CMOS technology scales down.
Therefore automatic sizing while taking care of second order effects is of great importance. In this paper a
method for automatic sizing and optimization of a floating voltage source (FVS) used in a CMOS Operational
Transconductance Amplifier (OTA) is presented. The optimization determines the optimal component values
and transistor dimensions for FVS in order to minimize the dissipated power and output impedance. The
presented methodology uses geometric programming (GP) and simulation-based optimization in a timeefficient
manner. The CMOS FVS is sized initially using convex optimization. Then the design is further
optimized by a simulation-based circuit optimizer to include second order effects. Since the initial design uses
GP method a globally optimum solution is obtained. The presented approach uses MATLAB version 7.1.0.246
and Cadence Analog Circuit Optimizer. The results are verified by detailed analog simulation using Cadence
Analog Design Environment (ADE from IC 5.0.33) in 0.35um mixed-mode CMOS process. Keywords:
Operational Transconductance Amplifier, Convex Optimization, Geometric
Programming,
Simulation-based Optimization.
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