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Inductive rotary joint with multimode inverter

  • US 10,050,471 B2
  • Filed: 12/17/2015
  • Issued: 08/14/2018
  • Est. Priority Date: 12/18/2014
  • Status: Active Grant
First Claim
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1. An inductive power transfer circuit comprisingan inductive rotating coupler having a primary side rotatably arranged against a secondary side, the primary side comprising at least a primary winding the secondary side comprising at least a secondary winding that is connected to a rectifier configured to deliver a DC output, the inductive rotating coupler further having a stray inductance;

  • a resonance capacitor coupled in series with at least one of the primary winding and secondary winding the resonance capacitor forming a series resonance circuit together with the stray inductance defining at least one series resonance frequency,an inverter configured to convert a DC input voltage from a DC voltage source into an AC voltage, the inverter including at least four semiconductor switches that forma first branch of a first switch and a second switch anda second branch of a third switch and a fourth switch in a full bridge circuit, anda control circuit configured to generate control signals to control the at least four semiconductor switches, the control circuit being configured to generate control signals for a full bridge mode operation wherein alternatingly are closed the first switch together with the fourth switch, and the second switch together with the third switch,wherein the control circuit is further adapted to generate control signals for a half bridge mode operation, in which one switch of one of the first and second branches is closed to connect an inverter output to either a positive output of the DC voltage source or a negative output of the DC voltage source, and switches of the other of the first and second branches are closed alternatingly, andwherein the half bridge mode operation is initiated by independent and asynchronous depowering of one of drivers of one half bridge by a circuit that is independent from a bridge control circuit,wherein the control circuit is adapted to generate control signals for the half bridge mode operation for a given time and to switch later to a full bridge mode operation, wherein the control signals start with a low-duty cycle, which is increased with time.

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