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Method and apparatus for rapidly and dynamically adjusting current limiting in a portable communication device

  • US 10,470,062 B1
  • Filed: 03/12/2019
  • Issued: 11/05/2019
  • Est. Priority Date: 07/30/2018
  • Status: Active Grant
First Claim
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1. A portable communication device, comprising:

  • a battery having battery profile;

    a master processor for controlling a primary load providing mission critical land mobile radio (LMR) radio operations;

    a slave processor for controlling a secondary load of non-LMR processes, the LMR operations and non-LMR processes operating in parallel;

    a comparator bank coupled to the master processor and the battery, the comparator bank being configured with a plurality of trip thresholds based on the battery profile, the comparator bank monitoring the battery for a predetermined high current LMR radio condition;

    a logic interface coupled to the comparator bank, the logic interface generating a current limit control signal and an interrupt control signal in response to the comparator bank detecting the predetermined high current LMR radio condition at a primary load, the current limit control signal being applied to a current limiter selection stage, and the interrupt control signal being applied to the slave processor; and

    the current limiter selection stage providing scaled back current to the primary load in response to the current limit control signal indicating the predetermined high current LMR radio condition, the slave processor scaling down maximum allowable clock rates of non-LMR peripherals in response to the interrupt control signal, the current limiter selection stage restoring maximum current to the LMR operations of the primary load in response to the slave processor scaling down core clock rates of non-LMR peripherals at the secondary load, the non-LMR processes being restored after the predetermined high current LMR radio condition ceases, thereby enabling parallel operation of LMR radio operations and non-LMR radio processes to resume.

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