Motor drive circuit and method

Details Motor drive circuit and method Motor drive circuit and method

2007-08-01

2009-10-27

Masih, Karen (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400350, C318S400130

Reexamination Certificate

active

07609013

ABSTRACT:
A motor drive method which supplies a drive current in a pulse form to a multiphase motor, to drive the motor. The motor drive method includes the steps of: generating a pulse signal having a duty ratio in accordance with torque, alternately repeating an ON time-period and an OFF time-period in accordance with the pulse signal, to supply a drive current in a pulse form to a phase coil currently driving, interpolating back electromotive voltage of the OFF time-period (Toff), using a back electromotive voltage (Vu) of the ON time-period (Ton), with respect to the back electromotive voltage (Vu) occurring in at least one coil of the multiphase motor, to generate an interpolated virtual back electromotive voltage (Vu′), detecting a zero-cross point, by comparing the interpolated virtual back electromotive voltage (Vu′) with a midpoint voltage (Vcom) of the coil, to generate a BEMF detection signal (BEMF_EDGE), and switching a phase to be driven, based on the BEMF signal (BEMF_EDGE).

REFERENCES:
patent: 2008/0157830 (2008-07-01), Kume
patent: 3-207250 (1991-09-01), None
patent: 10-243685 (1998-09-01), None
patent: 11-75388 (1999-03-01), None

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