Method and apparatus for improved transition from pulse width mo

Details Method and apparatus for improved transition from pulse width mo Method and apparatus for improved transition from pulse width mo

1997-10-23

1999-11-30

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

330261, H02P 600, H03F 345

Patent

active

059948566

ABSTRACT:
A method and a circuit for switching a motor controller from pulse width modulation to linear control for a brush-less, sensor-less, poly-phase DC motor. The method includes steps of operating a drive circuit for a poly-phase direct current motor in a pulse width modulation mode and determining that a zero crossing will occur within a predetermined interval. The method also includes steps of enabling a bias current to a transconductance operational amplifier and changing an operating state of the drive circuit from the pulse width modulation mode to a linear mode. The method further includes steps of determining that the zero crossing has occurred, disabling the bias current to the transconductance operational amplifier and changing the operating state of the drive circuit from the linear mode to the pulse width modulation mode.

REFERENCES:
patent: 5221881 (1993-06-01), Cameron
patent: 5231338 (1993-07-01), Bulgarelli et al.
patent: 5306988 (1994-04-01), Carobolante et al.
patent: 5317243 (1994-05-01), Cameron
patent: 5319290 (1994-06-01), Yoshino et al.
patent: 5572096 (1996-11-01), Schlager
Sedra/Smith; "Microelectronic Circuits", fourth edition, Oxford University Press, 1998, pp. 603, 658, 704, 736, 1172-1175, 1220.

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