Rev. A | Page 1 of 12 INTRODUCTION This application note describes the circuit architecture and details required to measure the impedance profile of a commercial loudspeaker using the AD5933 impedance-to-digital converter. By evaluating the acoustic properties of loudspeakers through an impedance measurement from 1960 to 1970, two Australian pioneers, N. Thiele and R. Small, defined the Thiele-...

Switched-capacitor (SC) DC-DC converters have several advantages over inductive DC-DC converters in that they are easily integrated on-chip and can scale to desired power levels, rendering themselves promising for integrated voltage regulators, especially for small, low-power systems. However, many SC DC-DC converters offer only a few conversion ratios, limiting their use for systems in which e...

In this paper conducted electromagnetic interference (EMI) of boost converter with switching frequency modulation (SFM) is theoretically analyzed in details. In the analysis line impedance stabilization network parameters, power inductor and input filtering capacitor parameters are taken into account. The analysis shows that the conducted EMI attenuation due to the use of SFM depends not only o...

Due to ready availability of resources, there is a vast spike in the growth of sustainable power sources. Among them solar photovoltaic (PV) world power technique is presently careful, being an of great magnitude substitute influence supplier, for the reason that of the set availability of eminent able PV panels with the aim of eliminate the depressing environmental aspects. Low voltage PV syst...

This paper proposes an inductive coupled wireless power transfer (WPT) system with class-E2 dc-dc converter along with its design procedure. The proposed WPT system can achieve high power-conversion efficiency at high frequencies because it satisfies the class-E zero-voltage switching and zero-derivative-voltage switching conditions on both the inverter and the rectifier. By using the class-E i...

This paper proposes a theory for optimizing the power generated from stationary stochastic vibratory disturbances, using a resonant energy harvester. Although the theory is general, the target application of the paper concerns ocean wave energy harvesting. The control technique involves the use of a causal discrete-time feedback algorithm to dynamically optimize the power extracted from the wav...

This work was supported by CNPq. Dr. Spiazzi visit to the University of Campinas was supported by FAPESP. Abstract The effects of a non negligible source impedance, due to the presence of an input EMI filter, on the stability of Power Factor Preregulators with average current control are analyzed by using a State Space Averaged model. The modeling allows to derive a simple expression for the lo...

The paper describes a battery storage unit for small DC micro-grids based on a multi-cell topology. The system consists of a series arrangement of lead-acid type battery cells where each cell is equipped with an individual DC-DC buck converter located directly at the battery terminals. For minimizing the output ripple the cells are operated in interleaved PWM mode. With this the cell-to-cell wi...

A method for the on-line calibration of a circuit Most of the methods described sense the inductor curboard trace resistance at the output of a buck converter is rent, which has the same DC value as the output current, described. The input current is measured with a precision and tracks it well up to the closed-loop bandwidth of the resistor and processed to obtain a DC reference for the output...