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This paper examines the system design of a range of RF amplifiers for science and industry that are in an advanced stage of development at e2v. It describes how traditional industrial motor drive power electronics and modern industrial high voltage converter design have been integrated into a compact modular unit and how system control and monitoring is achieved via a new generation of embedded, real...
This paper compares the calculated reliability of a matrix converter with an 18-pulse rectifier-inverter topology for a typical aerospace motor drive application. The military handbook MIL-HDBK-217F guidelines have been used to predict reliability. Although the matrix converter has a higher number of semi-conductor switches, these switches are subjected to a lower voltage stress, which can shown to...
Iron losses due to flux harmonics in stator cores of pulse-width-modulation [PWM] back-to-back inverter-fed induction motors have a major effect on system efficiency. A new generation of direct AC-AC matrix converters offer important advantages over classical frequency converters such as absence of bulky and temperature sensitive DC-links and possible adjustment of power factor. The paper presents...
This paper is concerned with the development of a new type of power supply for high power RF applications for CW operation. Losses are reduced by the use of zero current switching. This allows for a high operating frequency and minimised transformer and filter size. Preliminary practical results have been found to be promising, with design of the resonant circuit and isolating transformer being fundamental...
This paper investigates the utilization of a buck-type current source rectifier as an active front-end stage for an AC/AC converter for applications that require adjustable step-down DC-link voltage with improved upper voltage limit robust to unbalanced voltage supply and additionally eliminating the low-frequency common mode voltage from its DC-link voltage. The proposed solution is to add two asymmetric...
Iron losses due to flux harmonics in stator cores of Pulse-Width-Modulation [PWM] back -to-back inverter-fed induction motors have a major effect on system efficiency. A new generation of direct ac-ac matrix converters offer important advantages over classical frequency converters such as absence of bulky and temperature sensitive dc-links and possible adjustment of power factor. The paper presents...
This paper focuses on new control techniques for a direct power converter having a resonant tank on the output side feeding a rectifier. The application being considered is for HV power supplies. The objective of the control is to provide a stable output, with good supply current quality. Two predictive controllers are described, one based on the output tank dynamics and one based on the input filter...
This paper investigates the utilization of a buck-type current source rectifier as an active front-end stage for an AC/AC converter for applications that require adjustable step-down DC-link voltage with improved upper voltage limit robust to unbalanced voltage supply and additionally eliminating the low-frequency common mode voltage from its dc-link voltage. The proposed solution is to add two asymmetric...
This paper compares the calculated reliability of a Matrix Converter with an 18-pulse rectifier/inverter topology for a typical aerospace motor drive application. The military handbook MIL-HDBK-217F guidelines have been used to predict reliability. Although the Matrix Converter has a higher number of semi-conductor switches, these switches are subjected to a lower voltage stress, which can shown to...
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