Showing papers by "Hans Ertl published in 1998"
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TL;DR: The conduction losses of power MOSFETs are calculated analytically for application in three-phase voltage DC-link pulsewidth modulation (PWM) power converter systems and the dependency of the turn-on behavior on the drain current is considered in terms of a quadratic approximation.
Abstract: In this paper, the conduction losses of power MOSFETs are calculated analytically for application in three-phase voltage DC-link pulsewidth modulation (PWM) power converter systems. Contrary to a conventional calculation, the dependency of the turn-on behavior on the drain current is considered in terms of a quadratic approximation. The derived relationships are represented graphically; they can be included directly into the dimensioning of the power transistors.
26 citations
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31 Aug 1998
TL;DR: In this paper, a regenerative braking system is discussed based on a 10 kW laboratory model, where the current flowing into the mains via always two phases from the DC link is controlled by the power transistor of the braking chopper.
Abstract: If the braking resistor of a conventional dissipative braking system (braking chopper) of a three-phase AC motor drive is replaced by a thyristor bridge (loss-free braking resistor) controlled in the full inverter operation, the braking energy of the drive can be fed back into the mains. This means that the current flowing into the mains via always two phases from the DC link is controlled by the power transistor of the braking chopper. In this paper, this regenerative braking system is discussed based on a 10 kW laboratory model.
5 citations