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The switching dead time to protect the inverter main transistors from the arm shortage is investigated. The dead time causes not only waveform distortion, but also zero clamping phenomena. The zero clamping phenomena increase as the switching frequency increases. The inductance model was used to clarify the mechanism of the zero-clamping phenomena, and the(More)
This paper proposes a new position sensorless control for interior permanent-magnet synchronous motor (IPMSM) drives fed by overmodulation mode pulsewidth modulation (PWM) voltage source inverter. It is attractive to expand the speed range of the IPMSM for application to electric vehicles, electrical household appliances, and so on. An overmodulation mode(More)
With the development of devices for high performance, the circuit technologies have been also studied. One of the main streams concerns a soft switching technology to mitigate switching stress, leading to the reduction in switching losses or electromagnetic noise. On the other hand, as a characterized orthodox technology, the existing chopper circuit is(More)
A technique for the regenerative control of a voltage source inverter is described. In the proposed equipment, the rectifier bridge is utilized for regeneration through a medium of a DC reactor. Another type of regenerative control that involves a modified Cuk converter method is described. A frequency analysis approach using the switching function is used(More)
Techniques for the regenerative control of a voltage source inverter are described. In these techniques, the thyristor rectifier bridge is used for regeneration through a DC reactor or a capacitor. The first method of regenerative control uses a pulse-width modulation (PWM) strategy in which the polarity of the sawtooth carrier waveforms are reversed(More)
EDLCs (Electric Double Layer Capacitors) offer high energy density and long life span, so various applications may be anticipated in the realm of energy storage devices, such as those used in electric vehicles or electric power stabilisation in power systems, etc. However, since the voltage limit is low of the devices, it is necessary to connect them in(More)
For consumer electronics and appliances, rectifier circuits of the capacitor input type are generally used. The various harmonics generated within such a power system become a serious problem. Various studies to reduce these effects have been presented so far. However, most of these employ switching devices, such as MOSFETs and the like. Removing the need(More)
–This paper shows a parameter identification scheme for speed sensorless vector controlled induction motor using output inter-sampling approach and experimentally evaluates this method. It is well known that both the rotor speed and the rotor time-constant of induction motors cannot be identified under steady state operation. This is because vector control(More)
Various harmonics in power systems are measured typically by the heterodyne receiver in analog techniques or the FFT (fast Fourier transform) analyzer in digital methods. Using these methods, the harmonics can be analyzed over a wide range of frequency. However, circuit configurations using such methods become very complicated and the devices become too(More)