This paper proposes a fully distributed control methodology for secondary control of AC microgrids. The control framework includes three modules: voltage regulator, reactive power regulator, and active power/frequency regulator. The voltage regulator module maintains the average voltage of the microgrid distribution line at the rated value. The reactive power regulator compares the local normal...

This article aims to present the design of a 4.5-V, 450mA low drop-out (LDO) voltage linear regulator based on a twostage cascoded operational transconductance amplifier (OTA) as error amplifier. The aforementioned two-stage OTA is designed with cascoded current mirroring technique to boost up the output impedance. The proposed OTA has a DC gain of 101 dB under no load condition. The designed r...

In this paper, a new circuit of power supply for microprocessors, named as switched-inductor multiphase voltage regulator module (VRM), is presented and designed. One of the main requirements of VRMs for today’s microprocessors is fast transient response. The other issues associated with conventional VRMs are small duty ratio, large ripple and low efficiency. A solution to the limitations of th...

An active filter-based on-chip DC–DC voltage converter for application to distributed on-chip power supplies in multivoltage systems is described in this paper. No inductor or output capacitor is required in the proposed converter. The area of the voltage converter is therefore significantly less than that of a conventional low-dropout (LDO) regulator. Hence, the proposed circuit is appropriate...

The PC industry continues to move closer to the goal of having DC/DC converters that deliver up to 150–200 Amp at 0.95V in the near future. This goal may be an achievable one if engineers carefully consider all of the loss mechanisms, especially loss mechanisms are that most pronounced at high currents such as 30A to 40A per phase. As a step in moving closer to this goal, we have developed a se...

Low-ac-resistance planar or foil-wound inductors constructed using a quasidistributed gap comprising multiple small gaps that approximate a distributed gap are analyzed. Finite-element simulations are used systematically to develop a model broadly applicable to the design of such quasidistributed gap inductors. It is shown that a good approximation of a distributed gap is realized if the ratio ...

Renewable energy sources like wind, sun, and hydro are considered as a reliable alternative to the traditional energy sources such as oil, natural gas, or coal. This paper describes modeling and simulations to determine a method for the power performance evaluation of autonomous wind turbine system. A speed control regulator is utilized to control the DC bus voltage. The inverter gate’s signals...

Efficient ac/dc rectification of low voltages is critical for the realization of fully-functional vibrational energy harvesting systems. This paper presents the design and experimental characterization of low-power ac/dc converter designed to operate with very low input voltage amplitudes (as low as 20 mV) for magnetic induction energy harvesters. The bridge voltage doubler provides a dc output...

This paper investigates the application of a nonlinear controller to the multi-input multi-output model of a system consisting of a hydraulic turbine and a synchronous generator. The controller proposed is based on a feedback linearization scheme. Its main goal is to control the rotor angle as well as the terminal voltage, to improve the system's stability and damping properties under large dis...

Recently, battery-operated wireless communication systems with low power consumption and high sustainability on operating time for batteries have wide applications. In these systems, low-power CMOS RF ICs are the key components for achieving system performance goals. One effective means of reducing power dissipation is to decrease supply voltage. Moreover, as CMOS technology moves below 100 nm,...