The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Thanos Kyriazis - One of the best experts on this subject based on the ideXlab platform.
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Ultrasonic Processes
internal, 2017Co-Authors: Thanos KyriazisAbstract:are available with varying levels of process control, from basic to microprocessor-controlled units. Controllers can operate at a constant frequency or, in newer
Slobodan Cuk - One of the best experts on this subject based on the ideXlab platform.
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Constant-Frequency control of quasi-resonant converters
IEEE Transactions on Power Electronics, 1991Co-Authors: Dragan Maksimovic, Slobodan CukAbstract:An additional independent control needed to eliminate the undesirable variable switching Frequency of quasi-resonant (QR) converters is obtained by replacing the output rectifier by an active switch. The concept is applicable to all classes of converters. Compared to QR converters with conventional switch realization, Constant-Frequency quasi-resonant (CF-QR) converters exhibit the same type of switching transitions and similar switch voltage and current stresses. Advantages of CF-QR converters are not restricted to the Constant-Frequency control. In all classes, operation at zero load is possible, so that the available load range is unlimited. The range of attainable, conversion ratios is significantly extended in the classes of zero-voltage quasi-square-wave (CF-ZV-QSW) and zero-voltage multiresonant (CF-ZV-MR) topologies. A practical design example of a 25 W CF-ZV-MR buck converter is constructed and evaluated. The converter operates at 2 MHz from zero load to full load, with a full-load efficiency of 83%. Simple duty ratio control is used to maintain the output voltage Constant for all loads. The circuit is inherently immune to the short-circuit condition at the output. Disadvantages of CF-QR converters are the increased gate-drive losses and increased complexity of the power stage and the control circuitry. >
Li Yan - One of the best experts on this subject based on the ideXlab platform.
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Three-phase Three-wire Active Power Filterswith Unified Constant-Frequency Integration Control
IEEE Transactions on Power Electronics, 2005Co-Authors: Li YanAbstract:Active Power Filter (APF) with Unified Constant-Frequency Integration Control (UCIC) make itself get rid of the traditional control method of sensing harmonics and reactive current components and generating compensating currnts according to signals sensed.It simplifies the structure of APF and makes it cost less.It is supported by experiments that three-phase three-wire APF with unified Constant-Frequency control is a viable solution to mitigate the harmonics and improve the power factor and abate the instability of power supply point.
Dragan Maksimovic - One of the best experts on this subject based on the ideXlab platform.
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Constant-Frequency control of quasi-resonant converters
IEEE Transactions on Power Electronics, 1991Co-Authors: Dragan Maksimovic, Slobodan CukAbstract:An additional independent control needed to eliminate the undesirable variable switching Frequency of quasi-resonant (QR) converters is obtained by replacing the output rectifier by an active switch. The concept is applicable to all classes of converters. Compared to QR converters with conventional switch realization, Constant-Frequency quasi-resonant (CF-QR) converters exhibit the same type of switching transitions and similar switch voltage and current stresses. Advantages of CF-QR converters are not restricted to the Constant-Frequency control. In all classes, operation at zero load is possible, so that the available load range is unlimited. The range of attainable, conversion ratios is significantly extended in the classes of zero-voltage quasi-square-wave (CF-ZV-QSW) and zero-voltage multiresonant (CF-ZV-MR) topologies. A practical design example of a 25 W CF-ZV-MR buck converter is constructed and evaluated. The converter operates at 2 MHz from zero load to full load, with a full-load efficiency of 83%. Simple duty ratio control is used to maintain the output voltage Constant for all loads. The circuit is inherently immune to the short-circuit condition at the output. Disadvantages of CF-QR converters are the increased gate-drive losses and increased complexity of the power stage and the control circuitry. >
E. S. Saraiva - One of the best experts on this subject based on the ideXlab platform.
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Achieving Constant Frequency operation in DC-DC resonant converters through magnetic control
2010 IEEE Energy Conversion Congress and Exposition, 2010Co-Authors: J. Marcos Alonso, Marina S. Perdigao, D. Gacio, L. Campa, E. S. SaraivaAbstract:In this paper a new solution to operate dc-dc resonant converters at Constant Frequency is investigated. The proposed converter is based on the use of a variable inductor to achieve output voltage control and regulation at Constant switching Frequency. The output voltage characteristics for two typical dc-dc resonant converters operating under this so-called magnetic control are analyzed. As an example, the design of a 48V input 5V/10A output, 500 kHz prototype was carried out. Also, the dynamic behavior of this prototype was investigated by performing a step response test. From this result, a compensator for operating in closed loop was designed and experimented. The obtained results showed that the proposed control method could be a good possibility to achieve Constant Frequency operation in dc-dc resonant converters.