Wechselstromquelle zur Erzeugung eines durch den Körper zu sendenden Wechselstroms und Verfahren zur Erzeugung eines stabilen Wechselstroms

• Main Author: GERSING, EBERHARD
• Format: Patent
• Language: German
• Published: 28.07.2005
• Edition: 7
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DIAGNOSIS; ELECTRICITY; GENERATION; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; MEDICAL OR VETERINARY SCIENCE; PHYSICS; SURGERY; TESTING

Medical safety requires for measurement of electrical bioimpedance, wherein an alternating current is applied to the human body, an insulation barrier between the energy source, which provides the energy for the current, and the human being. This insulation barrier can be accomplished by utilizing a transformer. According to the invention, a signal representing the voltage at the output of the current source is used for a positive feedback to ensure that the current provided by the alternating current source is constant over a wide range of loads ZX and a wide range of frequencies. For instance, the alternating current applied to the human body by a transformer is measured with the help of a current measuring transformer and the measured signal utilized for controlling in a closed loop the alternating voltage at the input of the current source, which drives the transformer for the purpose of generating the alternating current.