Quasi-Resonant ZVSPWM Inverter.

Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)

Sodeyama²,

Morizane³

et al.

In t h~s paper, a new soft-switching utility pulse amplitude modulation (PAM) inverter system for motor drive is proposed. In general, an induction motor dnven by the non-sinusoidal pulse width modulation (PWM) voltage generates a torque ripple. Therefore, the inverter for the motor drive generally improves the output voltage waveform by removing the lower-order harmonics. Although the output voltage waveform is a non-sinusoidal waveform, the motor dnven by the proposed modulating signal produces approximately constant torque. It is possible to reduce the number of commutation, to increase the amplitude of the fundamental component and to reduce the torque ripple in the new PWh4 strategy.

Section: Introductionmentioning

confidence: 99%

Novel strategy for soft-switching PAM inverter system

Proceedings of the Power Conversion Conference-Osaka 2002 (Cat. No.02TH8579)

Sodeyama²,

Morizane³

et al.

Soft-switching technique in pulse width modulation inverters

Guo-cheng

Nakamura

2000

J. of Shanghai Univ.

In this paper, a new soft-switching inverter using a minimum number of devices, and a new PWM (pulse-width modulation) method suitable for 3-phase soft-switching inverters are proposed. The circuit is used as an interface between the DC supply and the conventional voltage source of a PWM inverter. The number of switching operations can be reduced by using the PWM strategy. Increasing the amplitude of the fundamental component contained in the output waveform results in an effective utilization of the DC supply, a reduction of nominated capacity of the inverter elements, and a reduction of switching loss in the switching devices.

Simulation on soft-switching PWM converter with high power factor

Guocheng

Nakamura

2001

J. of Shanghai Univ.

A new PWM converter based on soft-switching is introduced. The converter uses a minimum number of devices, and requires less switching operations than conventional techniques. Switching is realized solely in a ZVS (zero voltage switching) mode, therefore the loss is reduced and EMI (electromagnetic interference) is suppressed. The paper analyzes the operation of ZVS, and discusses the methods for maintaining a unit power factor and constant DC voltage. Changing the modulation index M and the phase angle 0 keeps the input current in phase with the voltage. It also keeps the current sinusoidal, and ensures a constant output voltage.