Patent ID: 9112366
Filing Date: 2015-08-18
Classification: A61B,H02J

Abstract:
1. A rotary joint system having stationary and rotating parts for inductively coupling electrical power between the stationary part and the rotating part, the rotary joint system comprising: first and second input circuits for converting an AC power line voltage into a DC voltage, an AC power generator adapted to received the DC voltage and to generate an AC power from the DC voltage, an inductive rotary joint having a primary side, a secondary side, the stationary part and the rotating part, a primary winding at the stationary part and a secondary winding at the rotating part, the AC power generator being operably coupled into the primary winding, said inductive rotary joint configured to transfer the AC power from the AC power generator to the secondary winding, a load at the rotating part operably connected to the secondary winding of the inductive rotary joint, a control unit located at a primary side coupled with and configured to control at least the AC power generator, and a control unit located at the secondary side coupled with and configured to control at least the load, and wherein: the first input circuit is configured to generate a first DC voltage that is lower than a nominal DC voltage and the second input circuit is configured to generate a second DC voltage that is higher than the nominal DC voltage, outputs of the first and second input circuits being operably connected to deliver power to the AC power generator, the AC power generator and the inductive rotary joint aggregately produce (i) a third DC voltage at the secondary side when the AC power generator receives the first DC voltage and (ii) a fourth DC voltage at the secondary side when the AC power generator receives the second DC voltage, the third DC voltage being lower than the nominal DC voltage and the fourth DC voltage being higher than the nominal DC voltage, and the control unit located at the secondary side is adapted to measure the voltage produced for the secondary side, to distinguish between the third DC voltage and the fourth DC voltage, and to enable the load when the fourth DC voltage is measured at the secondary side.