Sensorless brushless direct current motor drive using pulse...

Electricity: motive power systems – Switched reluctance motor commutation control

Reexamination Certificate

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Details

C318S132000, C318S434000, C318S599000

Reexamination Certificate

active

11396758

ABSTRACT:
Disclosed is a variable speed brushless direct current (BLDC) motor drive circuit. The circuit includes a plurality of high-side and low-side controlled switches coupled in a three-phase bridge configuration for commutating a BLDC motor, each phase of the bridge being connected to a corresponding phase of the motor, a controller for providing a drive signal to drive each of the high-side and low-side switches, and a speed control loop for controlling the motor by PWM of a DC bus voltage to achieve a constant motor speed. The speed control loop includes a pulse circuit receiving the drive signals provided from the controller for controlling the high-side switches and for providing a pulse signal that is related to a desired motor speed, a plurality of high-side drivers for driving the high-side switches, each high-side switch being coupled to a respective high-side driver, and a plurality of gating circuits each receiving the pulse signal from the pulse circuit and a drive signal for a respective high-side controller from the controller for generating a pulse width modulation (PWM) control signal having a pulse duration determined by said pulse signal from said pulse circuit to thereby drive each of the high-side drivers to modulate their corresponding high-side switches.

REFERENCES:
patent: 4631458 (1986-12-01), Furuichi
patent: 5289097 (1994-02-01), Erickson et al.
patent: 5689162 (1997-11-01), Li
patent: 5731670 (1998-03-01), Galbiati et al.
patent: 6034494 (2000-03-01), Kitamine et al.
patent: 6337548 (2002-01-01), Kawabata et al.
patent: 6903523 (2005-06-01), Peterson
patent: 2005/0029976 (2005-02-01), Terry
patent: 0 698 769 (1996-02-01), None
patent: 04 322173 (1992-11-01), None

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