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.

A switched capacitor, inductorless DC to AC voltage step-up power converter

Abstract: A technique for efficiently producing low-harmonic, 60 Hz sinusoidal 110 V AC from a 24 V DC source without inductors or transformers is presented. The novel circuit topology allows the same power MOSFETs that sequentially charge a bank of capacitors to synthesize the staircase sine wave approximation. A Fourier analysis of the effects of MOSFET on-resistance and switching time on a 1 kW prototype is presented. >

Fractional-N frequency synthesizer with sine wave generator

Abstract: A fractional-N frequency synthesizer is disclosed wherein the multi-modulus frequency divider in the feedback path of the phase locked loop is controlled by a delta-sigma modulator to achieve the desired division ratio. The fractional input control signal to the delta sigma modulator is dithered to break any periodicity in the modulator output signal to avoid the generation of fractional spurious frequencies.

Digital filter design at gate-level using evolutionary algorithms

Abstract: Traditionally digital filters are designed using the concept of a linear difference equation with the output response being a weighted sum of signal samples with usually floating point coefficients Unfortunately such a model is necessarily expensive in terms of hardware as it requires many large bit additions and multiplications In this paper it is shown how it is possible to evolve a tiny feed-forward rectangular array of logic gates to perform various filtering tasks – lowpass, bandpass, and multiband The circuit is evolved by assessing its response to digitised pure sine waves Some of the evolved circuits possess almost linear properties, which means that they are capable of filtering composite signals which have not been encountered in training

Power factor compensation device for motor driving inverter system

Abstract: The present invention relates to a power factor compensation device for a motor driving inverter which can improve a power factor of a voltage and a current inputted to the inverter driving a motor. The present invention detects a zero crossing point of an utility alternating current power, and outputs a driving signal corresponding to a plurality of sine wave form voltage values stored in a memory according to a detection result, when the zero crossing point of the utility alternating current power is detected in a state where the plurality of sine wave form voltage values corresponding to a voltage of the utility alternating current power and frequencies are stored in the memory. A switching transistor is switched according to the driving signal, and the voltage applied to the inverter is switched according to the switching operation, thereby improving the power factor.