An improved linear induction converter, also commonly referred to as a linear asynchronous machine, comprising two parallelepipedal magnetic cores which are disposed parallel to each other leaving a small gap wherein a conductor element is lodged, said magnetic cores being provided with two multiphase windings such that the number of wave lengths of each winding is an integer, different for each winding, and the two electric field waves moving at different speeds are always in phase at the cente...

A pipelined analog to digital converter comprises a first ADC stage thatccc receives one of an input voltage and a first residue voltage and a first voltage reference and that generates a first digital signal and a second residue voltage. A second ADC stage receives the second residue voltage from the first ADC stage and a second voltage reference and that generates a second digital signal, wherein the second voltage reference is lower than the first voltage reference.

A high resolution analog to digital converter comprising a low resolution analog to digital converter and an interpolating digital to analog converter, the interpolating digital to analog converter having a second order digital controller and a one bit quantiser arranged in a feedback loop. The low resolution analog to digital converter is coupled to a multi-stage decimation filter having an algorithm of any stage thereof determined in dependence upon the algorithm of the immediately preceding s...

A controller in a CATV converter provides three operating modes comprising: (1) a family viewing mode in which conversion of selected channels is blocked; (2) an enter access code mode for selecting the channels to be blocked from family viewing; and (3) a parental control mode in which all channels may be viewed. The family viewing mode is enabled by turn-on of the converter or by commands by the user or the CATV system operator. The enter access code mode is initiated by a user command. The pa...

The input direct current used to build up the electromagnetic field surrounding the windings of a flyback transformer is converted by direct transformer action to current for replenishing charge in a first capacitor. Flyback current from the flyback transformer is used to replenish charge in a second capacitor. The sum of the voltages across the capacitors is supplied as converted energy to a load. In accordance with the invention, ripple in this output voltage is suppressed by proportioning the...

Apparatus for synchronizing the oscillators of several clocked direct voltage converters where each direct voltage converter has a control circuit with the oscillator as an integrated component and each control circuit has a connection for a capacitor and a connection for a resistor for defining the oscillator frequency. Commercial elements TDA 4714 and TDA 4716 are preferred as the control circuit. The synchronization is attained by adjusting the frequency of the oscillator of a first direct vo...

A multislope, continuously integrating analog-to-digital converter can operate in either a conversion mode or a calibration mode. During the calibration mode, a calibration factor is calculated for use during the conversion mode. When applied to the conversion mode, the calibration factor corrects for errors in the conversion process.

A control system for an converter circuit using two interleaved boost circuits is described which uses a single PWM controller to control the switches in both of the interleaved boost circuits. A voltage feedback control circuit monitors the output voltage of the converter circuit and sends that information to the PWM controller. A current sensing circuit is provided that senses the current in each of the boost converters. The current sensed in the current sensing circuit is converted to a volta...

Extruded rectangular-channel ceramic honeycombs wherein the channels have a rectangular cross-section of aspect ratio 1.2:1 or greater and a hydraulic diameter D.sub.h and constant temperature Nusselt Number N.sub..mu. ("shape" heat transfer characteristic) yielding an "effective" channel surface area factor N.sub..mu. /D.sub.h of at least about 70, provide catalytic substrates for engine exhaust emissions control offering better light-off performance, enhanced conversion efficiency at current c...

A relatively compact and vibration-insensitive electric-to-pressure converter includes an annular flexure from which an annular electromagnetic coil depends into an annular gap defined by the pole pieces of a permanent magnet assembly. A compressed air exhaust nozzle is located below the central region of the flexure which controls the rate of exhaust of air from the nozzle, and therefore the output pressure of the converter, in dependence upon the magnitude of an electrical input current applie...