217915 ⎘
Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by combination of static with dynamic converters; by combination of dynamo-electric with other dynamic or static converters
Nonlinear trim head power supply with a wide input range and a high efficiency
#2Electro-mechanical kinetic energy storage device and method of operation
#3Electro-mechanical kinetic energy storage device and method of operation
#4Controlled contactless power transmission