Power converter with demand pulse isolation

  • US RE47,031 E1
  • Filed: 04/05/2016
  • Issued: 09/04/2018
  • Est. Priority Date: 07/03/2012
  • Status: Active Grant
First Claim
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1. Apparatus configured to provide switched-mode power conversion, the apparatus comprising:

  • an input port configured to receive input power;

    a switch configured to commutate the input power;

    galvanic isolation circuitry configured to provide galvanic isolation between the input port and an output port, wherein the galvanic isolation circuitry comprises a transformer comprising (i) a primary winding arranged in circuit with the input port and the switch and (ii) a secondary winding arranged in circuit with a first rectifier and the output port, wherein the transformer is configured to transfer power from the input port to supply voltage or current to a load connected to the output port;

    anda demand pulse generator galvanically connected to the secondary winding and configured to generate demand pulses applied via the galvanic isolation circuitry to the switch to adjust a frequency of the commutation of the input power to supply a desired amount of voltage or current to the load; and

    a capacitor and a second rectifier both galvanically connected to the secondary winding, wherein;

    the second rectifier is different from the first rectifier and is poled to charge the capacitor during forward pulses of the apparatus; and

    the demand pulse generator is powered by energy stored in the capacitor to generate the demand pulses.

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