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An Alternative Configuration for Digitally Controlled Parallel Connected DC–DC Power Converters Siew-Chong Tan
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... accurate design oriented model and step-by-step design procedure that ensure most merits of LLC converter is presented in [20]. As an extension of [20], another design methodology for optimal efficiency by minimizing the reactive energy is presented in [21], but it involved solving nonlinear equatio ...


... back ~to the ge‘nei'atorrfi’l‘he' magnetizing running; this load consisting m'ere'ly of e?ect -‘ o'f-the winding‘ 17 "alwiiys ‘preponder hi'inpsi ignition-apparatus,‘ signal-‘horn, (etc, ates over the demagnetizirrgie?eettithe so that theieis no‘ danger’ of the battery be ‘llO winding 16,1 *so that‘ ...
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... sufficient to guarantee the level of reliability typically deemed necessary for critical communications elements. Examples of critical communications elements would include transmitters for base station applications and fixed station applications that operate with long term continuous transmission a ...
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Variable-frequency drive



A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.VFDs are used in applications ranging from small appliances to the largest of mine mill drives and compressors. However, around 25% of the world's electrical energy is consumed by electric motors in industrial applications, which are especially conducive for energy savings using VFDs in centrifugal load service, and VFDs' global market penetration for all applications is still relatively small. That lack of penetration highlights significant energy efficiency improvement opportunities for retrofitted and new VFD installations.Over the last four decades, power electronics technology has reduced VFD cost and size and has improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.VFDs are available in a number of different low- and medium-voltage AC-AC and DC-AC topologies.
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