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AC/DC converters with wider voltage regulation range

  • US 10,135,350 B2
  • Filed: 04/16/2018
  • Issued: 11/20/2018
  • Est. Priority Date: 08/26/2015
  • Status: Active Grant
First Claim
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1. A converter, comprising:

  • a first DC/DC converter comprising a transformer, a primary side inverter coupled to a primary side of the transformer, and a secondary side rectifier coupled to a secondary side of the transformer, wherein the primary side inverter or the secondary side rectifier operates at multiple operating modes comprising multi-level half-bridge modes;

    a second non-isolated DC/DC converter coupled to the first DC/DC converter, the second non-isolated DC/DC converter being a DC/DC converter without having an isolation transformer in a power train; and

    a control circuit coupled to the first DC/DC converter, configured to determine an operating mode for the primary side inverter and an operating mode for the secondary side rectifier, and change the operating mode of the primary side inverter or the operating mode of the secondary side rectifier, the control circuit determining the operating mode for the primary side inverter or the operating mode for the secondary side rectifier by;

    determining a first input voltage sub-range that an input voltage of the converter falls in;

    determining a second output voltage sub-range that an output voltage required of the converter falls in; and

    determining the operating mode for the primary side inverter or the operating mode for the secondary side rectifier according to a pre-determined mapping between a first combination and a second combination, wherein the first combination comprises the first input voltage sub-range and the second output voltage sub-range, and the second combination comprises the operating mode of the primary side inverter and the operating mode of the secondary side rectifier.

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