A Doublesided Cycloconverter

High power factor high power density high voltage converter based on AC link

“…Due to different resonant links, control strategies and output types, there exist several different kinds of converter, including three-phase series-resonant cyclo-converter [8][9][10][13][14][15][16], AClink TM [12,[17][18][19][20], soft-switched three-phase buck-boost converter [11,21], parallel-resonant direct converter [22,23], series-resonant induction heating converter [24][25][26] and seriesresonant capacitor-charging-power-supply (CCPS) [27,28]. The application of AC-link TM based converter has been reported used in many fields, including high voltage application, motor driver, renewable generation and grid interconnection.…”

Novel operation and control modes for series-resonant converters

“…In the following section it will be shown that these interruptions may frequently occur in normally operated multiphase s.r.-converters, due to the absence of condition (10). Moreover, it will be shown that a control method exists which guarantees the occurrence of condition (12) [5], [7], [8] in fact necessary to control the capacitor peak voltage independently from the average current and maintain it at a sufficiently high value. The problem stated above can be solved by taking advantage of the specific structure of multiphase s.r.-converters.…”

A DC to 3-Phase Series-Resonant Converter with Low Harmonic Distortion

“…The s.r. dc to 3-phase ac converter presented, which is based on a concept presented by Schwarz [2] , does not possess these disadvantages. Moreover, the system has the common features of series-resonant converters (s.r.-converters) such as, 1) the system is inherently short-circuit proof, 2) the size of the system is small due to the high internal frequency, and 3) the system is capable of controlling and turning off power by a fraction of a millisecond.…”

“…From a fundamental point of view, the s.r.-converter is capable of dealing with multiphase ac power in a more sophisticated way [2]. A s.r.-converter can be considered as a network which generates an array of current pulses at a high frequency .…”

“…From (1) it follows that QD S¾2Es-S22Vo QT S11Es -S21 Vo (2) Because both QD and QT are positive, the sign of the lefthand term is negative. To satisfy (2), the coefficients Si, unconstrained, so that they are chosen such that the power is transferred in the desired direction.…”