Gerardo Mino-Aguilar

A Backstepping Approach to Decentralized Active Disturbance Rejection Control of Interacting Boost Converters

In this paper, the local trajectory tracking control problems ascribed to two interacting plants, considered as agents, are formulated as adaptive control problems, which involve online interaction estimation and interaction elimination. This approach gives rise to a robust decentralized collaborative control with virtually no information on the part of the agents. It is shown that when the interconnection effects are viewed as exogenous unstructured disturbances, such disturbance can be actively estimated and canceled from each individual subsystem model dynamics. The case presented deals with two agents, two interconnected boost dc–dc power converters, powered each one by a nonidentical photovoltaic module that represents a time-varying power supply. Then, a backstepping-based control together with an extended state observer is developed by each agent. The mutual goals of agents are to maintain a desired behavior (time-varying current demand) of the entire system in order to maintain the desired output voltage value and an equitable current sharing in each converter in order to supply a dc motor. The proposed distributed control technique is implemented in two TMS320F28335 digital signal processor (each one per agent) and its performance is experimentally evaluated in real time. It is shown that the proposed scheme is robust with respect to interaction, unmodeled nonlinearities, and unmodeled dynamics.

Design constraints for low distortion OTA's in on-chip analog front-ends

This paper discusses design constraints for low distortion Operational Transconductance Amplifiers (OTAs) on integrated analog front ends. It also compares traditional OTA topologies and proposes a new OTA showing significant reduction on distortion for wideband applications, the comparison is presented on a 0.35μm CMOS process. The proposed OTA is designed for on-chip analog front ends for radiation gamma detectors on a 130nm CMOS process.

A CMOS Frequency Doubler from the Analog Cosine Mapping Function

This work presents the design of a new frequency doubler by a simple inductorless active network, without the exigency of additional quadrature signals. The frequency doubling function of the proposed circuit relies on the analog cosine mapping operation. The mapping circuit is possible in voltage mode as the circuit is based on two face-to-face CMOS inverters switched by the same differential input signal. The circuit is designed, with a simple set of functions, according to the nonlinear circuit’s nature. It was designed in a CMOS 0.18-

Design of buck DC-DC converters from the linear quadratic regulator approach

\upmu

P-I nonlinear control for DC-DC buck converter using a Σ-Δ modulator

μm process with a doubling frequency up to

Fuzzy Scheduling Applied on Hydroelectric Power Generation

8~\text{ GHz }