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.
A new feedback-controlled ferroresonant regulator employing a unique magnetic component
A new feedback-controlled ferroresonant voltage regulator employing a single magnetic structure is presented. By introducing an additional magnetic path through the use of a second set of shunts, all the magnetic functions are provided in a minimum volume. In this new circuit, instead of permitting saturation of the output section of the core, an external control circuit simulates core saturation and provides a means of obtaining precision regulation. This circuit retains all the advantages of ferroresonant regulators such as high reliability and simplicity; in addition it reduces the stray magnetic field and proves to be economical.
Laminar heat or mass transfer in rectangular channels and in cylindrical tubes for fully developed flow: comparison of solutions obtained for various boundary conditions
Abstract A comparison is made of results obtained with various boundary conditions at the wall of the channels. By comparing blood Sherwood numbers for finite wall resistance with those for constant concentration boundary condition only a small variation is found for various points along the blood channel.