Analysis of a Resonant Converter Controlled by Triac
Analytical and experimental considerations in the constant voltage transformer are presented. The constant voltage transformer consists of a linear reactor, a linear transformer, a capacitor, a triac, and a feedback circuit. The feedback circuit is used to make the triac fire precisely at any angle from zero to ¿/2 so as to keep output voltage constant. An analysis of this circuit is presented in which the higher harmonic currents generated in the triac are neglected and the output voltage is assumed to be kept constant. The experimental results agree well with the theoretical value with respect to the load characteristic, the voltage characteristic, the power factor, and the jumping phenomenon.
An analytic and computer study of the jump phenomenon in ferroresonant regulators
At certain ac input levels, discontinuous jumps appear in the ferroresonant regulator's steady-state output-versus-input characteristic. The conditions are derived under which this action, known as jump resonance, can occur. The describing function method of nonlinear system analysis is used to derive the range of circuit parameters in which the jump can occur. It is found that the conditions for the jump can be expressed in terms of the values of the linear energy storage elements and the character of the non-linearity, and that there exists a unit circle in the Nyquist plane which must be avoided to assure the nonoccurrence of the jump. The theoretical analysis is supplemented with a computer study of the circuit using an analog computer simulation program.
ETL Tools in Enterprise Data Warehouse
A B S T R A C T An enterprise data warehouse (EDW) also known as Data warehouse (DW), is a system used for reporting and data analysis. DWs are central repositories of integrated data from one or more disparate sources. ExtractionTransformation-Loading (ETL) processes are responsible for all the operations taking place at the warehouse. These processes are performed by specialized tools known as ETL tools or also called as Data Integration tools. The ETL tools are available in the market either as closed source software or as open source software. An ETL tool from both these categories has their advantages and suffers from some limitations as well. The main objective of this paper is to highlight the importance of the data integration tools or also known as ETL tools in business intelligence environment.