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Present study analyzed the efficiency characteristics of LLC converters having current doubler rectification circuits. A current doubler rectification circuit has a coupled inductor as rectification circuit on the secondary side output terminal of the converter. A current doubler rectification circuit generally requires inductors on the secondary side however, the characteristic of an LLC converter...
The back emf harmonics of a PM synchronous motor is the main source of the torque ripples. The torque ripples make the mechanical vibration at low speeds and the acoustic noise at high speeds. The feed-forward harmonic currents compensation may reduce the torque ripples at low speeds, but the torque ripples at high speeds can't be reduced due to the limited bandwidth of the current controller. In...
A dead time of the PWM inverter for variable speed motor drives generates the distortion in the phase currents. The current distortion is one of the sources of torque ripples in a PM synchronous motor. In this paper, the effect of the dead time to the torque ripple of a PM synchronous motor is investigated. To reduce the current distortion caused by the dead time, the dead time compensation by the...
This paper presents a new single carrier wave comparison PWM method for 3 level 3 phase Vienna type rectifier. The theoretical background for the single carrier wave comparison PWM is presented. The model for this Vienna rectifier is reviewed briefly and the voltage unbalance problem according to the offset duty is analyzed. Finally, the simulation and experimental results prove the effectiveness...
The input voltage distortion in the three phase PWM rectifier is a main factor in the input current distortion and the voltage ripples across the DC link capacitor. This paper presents the MRAS(Model Reference Adaptive System) based input current harmonics reduction for the PWM rectifier under the input voltage distortion. The dq compensating voltages produced from the dq current difference between...
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