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Current sense accuracy improvement for MOSFET RDS (on) sense based voltage regulator by adaptive temperature compensation

  • US 10,338,669 B2
  • Filed: 10/27/2015
  • Issued: 07/02/2019
  • Est. Priority Date: 10/27/2015
  • Status: Active Grant
First Claim
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1. An Information Handling System (IHS) having temperature-compensated power control, the IHS comprising:

  • a computing component;

    a voltage regulation (VR) module comprising;

    an integrated circuit die;

    a power stage component contained in the integrated circuit die and comprising a high side driver and a low side driver both electrically connected to power the computing component with voltage-regulated power;

    a current sensor contained in the integrated circuit die to measure a monitored current (Imon) value of the voltage-regulated power; and

    a temperature sensor contained in the integrated circuit die and which measures a temperature value at one location of the integrated circuit die, wherein the temperature value sensed at the location has a nonlinear temperature coefficient relationship with a second temperature of the high side driver; and

    a VR controller in communication with the current sensor and the temperature sensor and which executes instructions that configure the VR controller to;

    receive the Imon value from the current sensor;

    receive the temperature value from the temperature sensor;

    determine a temperature-compensated Imon value based at least in part on the Imon value, the temperature value, and an empirically-derived temperature coefficient defined at the Imon value and the temperature value, the empirically-derived temperature coefficient being determined by a testing phase wherein a testing system;

    identifies an identifier (ID) for a power stage (Pstage) of the integrated circuit;

    performs an iterative process for thermal coefficient tuning, which records temperature and an Iout matrix;

    empirically captures sample values as an integrated circuit die temperature of the VR module continues to rise across an operating temperature range of the VR module;

    samples output current (Iout) and forms an output current matrix as an array, based on sampled output voltage and defined temperature points; and

    in response to completion of the iterative process, generates, by the testing system, a nonlinear thermal coefficient, current offset curve by performing one of;

    (i) calculating piecewise linear values to extrapolate between sampled values stored within an empirical database;

    or (ii) performing high-order polynomial curve fitting to extrapolate between the sampled values within the empirical database, wherein the empirical database is processed to create a look-up table that stores temperature coupling coefficients that provides fine-tuned temperature compensation for Imon across a VR operation range; and

    control the voltage-regulated power at least in part based on the temperature-compensated Imon value determined at least in part by the empirically-derived temperature coefficient.

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