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Controlling lead angle using a single motor integrated circuit pin

  • US 9,887,652 B2
  • Filed: 06/17/2016
  • Issued: 02/06/2018
  • Est. Priority Date: 06/17/2016
  • Status: Active Grant
First Claim
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1. A system, comprising:

  • an analog-to-digital converter (ADC) configured to;

    receive a discrete analog voltage via a single integrated circuit pin to control a lead angle in a motor; and

    generate a digital bit value comprising a plurality of digital bits representing said analog voltage, said digital bit value encoding a target intercept indicator value as at least a first of the plurality of digital bits and a target slope indicator value as at least a second of the plurality of digital bits according to the discrete analog voltage; and

    control logic, coupled to the ADC, configured to;

    identify a target intercept and a target slope for a lead angle curve by decoding the digital bit value to determine the target intercept at least partially according to the first of the plurality of digital bits and determine the target slope at least partially according to the second of the plurality of digital bits, wherein the target intercept indicates a lead angle value at zero motor rotation frequency, and wherein the target slope indicates a rate of change of the lead angle curve corresponding to a change in the motor rotation frequency; and

    control the motor based on the lead angle identified using said lead angle curve.

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