BRAKING FUNCTION FOR BRUSHLESS DC MOTOR CONTROL
First Claim
1. A motor control circuit comprising:
- a motor driver circuit to apply a brake current to a coil of an external motor for active braking of the motor;
a braking control circuit, coupled to the motor driver circuit and responsive to an externally generated control signal, to control the active braking by the motor drive circuit so that the active braking occurs in two phases; and
wherein the two phases include a first phase comprising a first portion of the active braking, and a second phase comprising back electromotive force (BEMF) voltage sensing and a second portion of the active braking.
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Accused Products
Abstract
A motor control circuit that features a smart, two-phase braking operation is presented. The motor control circuit includes a motor drive circuit to apply a brake current to a coil of an external motor for active braking of the motor. The motor control circuit further includes a braking control circuit, coupled to the motor drive circuit and responsive to an externally generated control signal, to control the active braking by the motor drive circuit so that the active braking occurs in two phases. The two phases include a first phase that includes a first portion of the active braking and a second phase that includes back electromotive force (BEMF) voltage sensing and a second portion of the active braking.
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Citations
20 Claims
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1. A motor control circuit comprising:
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a motor driver circuit to apply a brake current to a coil of an external motor for active braking of the motor; a braking control circuit, coupled to the motor driver circuit and responsive to an externally generated control signal, to control the active braking by the motor drive circuit so that the active braking occurs in two phases; and wherein the two phases include a first phase comprising a first portion of the active braking, and a second phase comprising back electromotive force (BEMF) voltage sensing and a second portion of the active braking. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A system comprising:
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a system logic controller; and a motor control circuit, coupled to the controller, comprising; a motor drive circuit to apply a brake current to a coil of an external motor for active braking of the motor; a braking control circuit, coupled to the motor drive circuit and responsive to a control signal by the system logic controller, to control the active braking by the motor drive circuit so that the active braking occurs in two phases; and wherein the two phases include a first phase comprising a first portion of the active braking, and a second phase comprising back electromotive force (BEMF) voltage sensing and a second portion of the active braking.
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Specification