A theory of smart loudspeaker arrays is described where a modified Fourier technique yields complex filter coefficients to determine the broadband radiation characteristics of a uniform array of micro drive units. Beam width and direction are individually programmable over a 180-degree arc, where multiple agile and steerable beams carrying dissimilar signals can be accommodated. A novel method ...

The conventional SVPWM algorithm gives good performance for control of induction motor drive, but it produces more acoustical noise resulting in increased total harmonics distortion. The random pulse width modulation (RPWM) techniques has become an established means for mitigation of undesirable side effects in PWM converters, the use of voltage source inverters in adjustable speed ac drives in...

This paper proposes a single-phase seven-level inverter for grid-connected photovoltaic systems, with a novel pulse width-modulated (PWM) control scheme. Three reference signals that are identical to each other with an offset value that is equivalent to the amplitude of the triangular carrier signal were used to generate the PWM signals. The inverter is capable of producing seven levels of outp...

ABSTRACT A voltage source inverter is commonly used to supply a three-phase induction motor with variable frequency and variable voltage for variable speed applications. A suitable pulse width modulation (PWM) technique is employed to obtain the required output voltage in the line side of the inverter. The different methods for PWM generation can be broadly classified into Triangle comparison b...

The article presents a seven-level reduced switch asymmetrical multilevel inverter with two different methods of pulse width modulation (PWM) techniques. Phase disposition (PD) PWM and hybrid variable-frequency phase (HVFPD-PWM) are the for making quality output voltage waveform. In first method, unipolar sine reference triangular carriers is used. second (sinusoidal trapezoidal) proposed varia...

This paper investigates parallel structure general repetitive control (PSGRC) and its error convergence rate by using exponential function properties. PSGRC offers a general repetitive control solution for power converters to mitigate power harmonics distortions. PSGRC with appropriate settings will lead to various RCs with various error convergence rates at interested harmonic frequencies, e.g...

In Radar applications it is important to generate a sinus signal with low phase distortion. High precision oscillators have a low level of efficiency, they are expensive and also require an analog power amplifier with linear characteristic. The sinus generation with pulse width modulation (PWM) is effective and economical, but adds additional noise to the signal. When the transmission channel i...

The conducted Electromagnetic interference (EMI) emission due to the usage of a fixed frequency Pulse Width Modulation (PWM) controller in a buck switching power supply is studied .The study is based on the variations of PWM waveform due to those of input Voltage, reference Voltage,and load.Line Impedance Stabilization Network (LISN) is introduced to be employed in EMI measurement. An equivalen...

A robust controller for a single-phase Pulse-Width Modulation (PWM) inverter is designed. The single-phase PWM inverter generates an AC sinusoidal output from a DC link voltage. Robustness of the output waveform against load variations and minimum Total Harmonic Distortion (THD) are the main goals in this design. The importance of this design methodology results from the changes in the inverter...

This paper proposes an M-ary amplitude shift keying (MASK) power and information synchronous transmission system based on phase-shifted full-bridge (PSFB) for applications in wireless (WPT). The Pulse Width Modulation (PWM) waveform uses different phases to control the MOSFET inverter MASK modulation. voltage generates M transformation, forming a comprehensive flow. demodulation circuit process...