To reduce switching losses in switching power converters resonant and quasi-resonant circuit topologies are becoming more and more popular. This paper presents resonant inverter systems for drive applications. Resonant DC-Link Inverter and Resonant Pole Inverter are presented. Different discrete pulse modulation strategies are presented and a comparison between Pulse Width Modulation (PWM) and Discrete Pulse Modulation (DPM) is given. Measurements made in a three phase Active Clamped Resonant DC-Link Inverter are shown. A comparison of semiconductor device losses in a hard switched PWM voltage source inverter and in an Activez Clamped Resonant DC-Link Inverter is given.
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