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Switched mode converter with low-voltage turn-around mode

  • US 9,698,732 B2
  • Filed: 05/07/2015
  • Issued: 07/04/2017
  • Est. Priority Date: 05/08/2014
  • Status: Active Grant
First Claim
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1. A switching power stage for producing an output voltage to a load, comprising:

  • a power converter comprising a power inductor and a plurality of switches arranged to sequentially operate in a plurality of switch configurations;

    a controller configured to sequentially apply the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to operate the power converter in a plurality of modes including at least a turn-around mode and a boost mode, wherein;

    in the turn-around mode, the controller operates the converter as a differential output converter to switch a polarity of the output voltage, such that;

    during a charging phase of the power converter, the power inductor is coupled between (i) one of a first terminal of a power source and a second terminal of the power source and (ii) one of a first terminal of an output load and a second terminal of the output load;

    during a transfer phase of the power converter, at least one of the plurality of switches is activated in order to couple the power inductor between the second terminal of the power source and one of the first terminal of the output load and the second terminal of the output load; and

    the output voltage comprises a differential voltage between the first terminal and the second terminal; and

    in the boost mode, the controller operates the converter as a boost converter in order to boost one of the first terminal and the second terminal to a voltage greater than a supply voltage to the switching power stage; and

    a capacitor coupled to one of the first terminal and the second terminal, wherein the capacitor is coupled to the power inductor via at least one switch of the plurality of switches.

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