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Driving current of a moving coil loudspeaker, fed from a switched voltage-mode audio amplifier, display non-ideal transfer characteristic relative to the reference audio signal. This is chiefly due to the effective speaker voice coil electrical impedance and phase lag provided by the output filter. This study investigates the deviation in the transfer characteristics from the ideal constant gain and...
The capacitor voltage of an LC-filtered voltage source inverter is fed back for output-voltage regulation, which includes twin aspects of command tracking and output impedance control. The same feedback can also be used for active damping of filter resonance. Compared with the existing active damping techniques using filter inductor or capacitor current feedback, this technique saves a current sensor...
Widespread deployment of Voltage Source Inverters (VSI-s) in high penetration applications like distributed generation, UPS and stand-alone renewable energy conditioning imposes stringent demands on reliability and output voltage regulation. Reported literature offers numerous solutions for output voltage regulation, which includes twin aspects of command tracking and output impedance control. Most...
Grid-tied micro-inverters are reported to ensure higher energy harvest, but the requirement of large unit quantities raises concerns about cost. Low-cost processors as the control platform are therefore desirable but these are hamstrung with low numerical precision, which causes serious errors while numerically executing the control algorithms. In this paper, the crucial aspect of automatic phase...
R-modeled speaker fed by sliding mode(SM) controlled half bridged audio amplifier(HBA) show significant phase difference between reference voltage and speaker current. The causes of phase difference possibly are inaccurate speaker model and phase lead/lag introduced by the output filter. To investigate phase difference, the transfer function of HBA and approximated first order model of the speaker...
This paper proposes a detailed step-by-step design procedure and control of an LCL filter for grid connected three phase sine PWM voltage source inverter. The goal of the design is to ensure high quality of grid current as well as to minimize the size of filter magnetics. In order to ensure unity power factor injection into grid a current controller is designed with a constraint that only the inverter...
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