Sine wave

About: Sine wave is a research topic. Over the lifetime, 12183 publications have been published within this topic receiving 93013 citations. The topic is also known as: sinusoid.

Electrical load drive and control system

Abstract: A circuit for varying the power supplied from a D.C. power supply to a moderate to high powered load such as a motor is disclosed. Trapezoidal voltage and current waveforms are used approaching the maximum load power delivery available from sine wave drives and the minimum dissipation in the driver circuitry available with square wave drives, while at the same time minimizing the generation of undesirable electromagnetic interference (EMI).

Method of and apparatus for reducing energy consumption

Abstract: The proposed invention is an energy saving load control device primarily intended for inductive loads (i.e., fluorescent lighting, motors, etc.) operating from an alternating current (AC) source. The proposed device switches the load voltage off at arbitrary positions in the sine wave and simultaneously provides a commutating path for any inductive current. By switching the load voltage on and off and providing a commutating current path reduced energy consumption is realized.

A comparative evaluation of some practical algorithms used in the equivalent bits test of waveform recorders

Abstract: A comparative evaluation of three basic algorithms that are used in the equivalent-bit test in digital recorders is presented. The algorithms are used to calculate the parameters of a pure sinusoid which has been digitally recorded. The basic algorithms and their variations are evaluated with regards to relative and absolute accuracy as well as efficiency. Various methods of obtaining the initial estimates of the sine wave parameters are examined. The advantages, disadvantages and effects of the techniques used to arrive at these estimates are discussed and optimum methods are suggested. The work is intended to lead to the specification of a general best-fit algorithm to be used in sine-wave evaluation of digital recorders. >

RSFQ-based D/A converter for AC voltage standard

Abstract: Digital to analog converters based on the Josephson effect are promising for voltage standards, because they produce voltage steps with ultimate precision and stability. In this paper, we describe a project to develop a Josephson D/A converter designed for synthesizing a sinusoidal waveform with metrological accuracy. The D/A converter is based on RSFQ (Rapid Single Flux Quantum) logic circuits, and consists of a frequency multiplier (FM), a pulse distributor (PD), and a number of voltage multipliers (VMs). Each VM circuit, corresponding to the n-th bit digital code, multiplies the number of SFQ pulses by a factor of 2/sup n/. By gating the input SFQ pulses from the FM to the VMs using the PD circuits, a programmable output voltage is obtained. Possible sources of uncertainties in the measurement of the rms value of the synthesized sine wave are discussed.