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Switching node based sensorless motor control for PM motor

  • US 7,719,223 B2
  • Filed: 03/07/2007
  • Issued: 05/18/2010
  • Est. Priority Date: 03/09/2006
  • Status: Active Grant
First Claim
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1. A circuit for indirectly measuring a sign of a current flowing in an inverter stage coupled to a phase of a motor or induced by a counter Electromotive Force (EMF) in a coil of the phase of the motor, the inverter stage being connected between a power supply and the ground, the circuit comprising:

  • a gate driver circuit coupled to the inverter stage for alternatively connecting the phase of the motor to the power supply and to ground, the gate driver circuit having a current sign detection circuit,wherein the current sign detection circuit, in a current sign mode, senses the sign of the current flowing in the inverter stage for controlling the commutation of switches in the inverter stage, and, in a voltage sample mode, samples a counter EMF voltage across the coil with respect to a fixed threshold voltage and uses EMF zero crossing information to control the motor.

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