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A parallel ZVS (Zero Voltage Switching) forward converter is proposed to achieve load current sharing, output ripple current cancellation and conversion efficiency improvement. Two forward converters are connected in parallel to achieve interleaved PWM operation. Thus the ripple currents on the output side are partially cancelled each other so that the size of output chokes and capacitor is reduced...
In the Full Bridge (FB) Phase Shifted (PS) PWM converter, external snubber capacitors are connected in parallel to IGBTs in order to decrease turn off losses. The ZVT condition is not provided at light loads, thus the parallel capacitors discharge through IGBT at turn on and this causes switching losses and failure risk of the IGBT. Capacitor discharge through IGBT restricts the use of high valued...
A hybrid pulsewidth modulation (PWM) scheme that hybridizes the advantages of unipolar switching scheme (USS) and bipolar switching scheme (BSS) for grid-connected current source inverter (CSI) is presented. The former switching scheme has the advantage of low switching losses while the latter one has the advantage of generating output with low total harmonic distortion (THD). The inverter bridge...
This paper calculates and compares the efficiency and loss distribution in the three most popular state-of-the-art types of large motor drive systems: 1) current-source drive with active front-end rectifier; 2) current-source drive with 18-pulse thyristor rectifier; and 3) three-level voltage-source drive with 12-pulse/24-pulse diode rectifier. For converter systems with efficiencies better than 90%,...
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