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Motor control circuit

  • US 9,793,839 B2
  • Filed: 07/04/2016
  • Issued: 10/17/2017
  • Est. Priority Date: 03/14/2016
  • Status: Active Grant
First Claim
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1. A motor control circuit, adapted for driving a three-phase motor from a start state to a normal operation state, and the motor control circuit comprising:

  • a full-bridge circuit, electrically connected to the three-phase motor;

    a hall sensor, configured close to the three-phase motor, and configured for sensing a position of magnetic poles of the three-phase motor to generate a hall signal;

    a storage, electrically connected to the hall sensor and configured for storing six digital models, the six digital models having sequential relationship and being associated with a phase switching of the full-bridge circuit, to provide the operation of the three-phase motor;

    a start controller, electrically connected to the hall sensor and the storage; and

    an operation controller, electrically connected to the hall sensor, the storage, and the full-bridge circuit;

    wherein in the start state, when the start controller receives a start signal indicating start of the motor control circuit, the start controller periodically generates a commutation signal, the storage transmits the digital models in sequence to the operation controller starting from the first digital model according to the level of the commutation signal and the level of the hall signal, and the operation controller executes the phase switching of the full-bridge circuit according to the digital models received in sequence, to drive the three-phase motor;

    wherein in the start state, when the start controller determines that there is a first level conversion of the hall signal, the start controller periodically generates the commutation signal, the storage transmits the fourth, the fifth, and the sixth digital models in sequence to the operation controller according to the commutation signal and the level conversion, and the operation controller executes the phase switching of the full-bridge circuit according to the digital models received in sequence, to drive the three-phase motor;

    wherein in the start state, when the start controller determines that there is the second level conversion of the hall signal, the operation controller averages a total time of the fourth, the fifth, and the sixth digital models to generate a switching time, and to enter the normal operation state, wherein in the normal operation state, the operation controller captures six digital models in sequence from the storage once every switching time, and executes the phase switching of the full-bridge circuit according to the switching time.

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