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State of Charge (SoC) is the most important parameter to be estimated on a Battery Management System (BMS). Improper SoC management can cause faster battery degradation, reduce its operational lifetime and, on extreme cases of overcharge, it may lead to an explosion. In addition, batteries are complex electrochemical systems, and both the electrical components and chemical reactions vary significantly...
The Thermal Sigma-Delta (TΣΔ) modulator is a thermal-electric system where the resistive element performs in the thermal domain part of the ΣΔ modulator (sum and integration). In this work, we propose the modeling and we perform simulations of 1st and 2nd order TΣΔ modulators using bolometers as the thermal-electric device. This study has the purpose of achieving a complete solution of a bolometer...
Microelectrode arrays have extensive applications in the biomedical field. These applications range from the study of the influence of drugs in cell cultures to neuro-implants for attenuation of diseases, such as Parkinson's disease and epilepsy. The main block of the analog front-end attached to the MEA is the bioamplifier that amplifies biomedical potential signals. Different designs for this block...
This paper presents a procedure for testing physical layer fault tolerances of Wire/essHART, one of the most important industrial wireless sensor networks protocol. In order to evaluate radio weakness of this protocol, a set of conditions are evaluated in a typical network that can lead to possible faults. It has been identified an error situation that induces to a misinterpretation of the network...
This paper proposes an architecture of a conditioning circuit for dual-modality wire-mesh sensors, applied to multiphase flow measuring. The proposed circuit topology uses an AC-based impedance measurement technique, and is able to process signals from a 4×4 wire-mesh structure, performing an I/Q demodulation for the direct extraction of fluid permittivity and conductivity values. System-level considerations...
In this paper a new analog behavioral model of a negative temperature coefficient thermoresistive sensor developed using SPICE for a hot-wire Wheatstone-Bridge Constant Temperature Anemometer is proposed. The analog model was developed using a capacitor and voltage and current dependent sources. This model is suitable for transient and steady-state time domain analysis. Sensor's behavior is detailed...
This paper proposes a new architecture of a controlled-temperature hot-wire anemometer using voltage feedback linearization. The voltage feedback linearizes the sensor input-output relationship and the controller is designed to achieve null steady-state error and reduce the system response time. Analysis of the behavior of the architecture modeled using Simulink is presented for a NTC sensor. Simulation...
This paper derives a new approach for analyzing dc-dc converters for feedback control design. The control-to-output voltage transfer function of the converters, usually predicted by averaging models, and the classical feedback control techniques are replaced by the state space average state block diagram analysis. These state block diagrams are obtained for state space averaging matrixes of the converters...
The thermoresistive-based hot-wire anemometer operating at a controlled temperature is a classical architecture that is vastly found in the literature. Nevertheless, this architecture presents a problem due to dynamic range variation with respect to the fluid temperature. In this work an alternative architecture of a controlled temperature anemometer with automatic adjustment of the dynamic range...
This work presents the design of a 1st-order sigma-delta thermal modulator using a thermoresistive sensor in its feedback loop, as the summing and integrating elements. The proposed system architecture allows the measurement of physical quantities that interact with the sensor, as temperature, thermal radiation and fluid velocity. Procedures for obtaining the design specifications needed for its modeling...
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