Switching node based sensorless motor control for PM motor
First Claim
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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Accused Products
Abstract
A circuit for indirectly measuring a sign of a current flowing in an inverter stage coupled to a phase of a motor or indirectly measuring the sign of the voltage 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 includes 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 senses the sign of the current flowing in the inverter stage, or the sign of the counter EMF for controlling the commutation of switches in the inverter stage.
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Citations
17 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification