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Multi-primary transformer charging circuits for implantable medical devices

  • US 9,643,025 B2
  • Filed: 04/24/2015
  • Issued: 05/09/2017
  • Est. Priority Date: 09/08/2014
  • Status: Active Grant
First Claim
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1. An implantable medical device, comprising:

  • a transformer having;

    a magnetic core;

    a plurality of primary windings wound around the core comprising at least a first primary winding and a second primary winding; and

    a plurality of secondary windings wound around the core and magnetically coupled to the primary windings;

    a power source having at least a first cell and a second cell, the first cell being coupled to the first primary winding defining a first current path between the first cell and the transformer and the second cell being coupled to the second primary winding defining a second current path between the second cell and the transformer;

    a first switching element coupled along the first current path;

    a second switching element coupled along the second current path;

    a plurality of capacitors coupled in a series configuration, wherein each of the plurality of capacitors is coupled to a single winding of the plurality of secondary windings; and

    a low power circuit coupled to the power source for controlling the delivery of charge from the power source to the plurality of capacitors through the transformer.

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