Load current control of pulse width modulated drive signal inclu

Details Load current control of pulse width modulated drive signal inclu Load current control of pulse width modulated drive signal inclu

1995-04-19

1997-05-20

Hecker, Stuart N.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 41, H02M 324, H02M 542

Patent

active

056318170

ABSTRACT:
A PWM pulse of a duty ratio according to a current instruction value D of a servo control section is outputted from a pulse width modulating section to a driving section, thereby current driving a load. In a calibrating process, a calibration processing section outputs a reference current instruction value Dr corresponding to a reference load current Ir and measures a drive current Is of a load. When the measurement current Is doesn't coincide with the reference load current Ir, the current instruction value is adjusted, a current instruction value Ds of the measurement current Is which coincides with the reference load current Ir is obtained, and a correction coefficient K=Ds/Dr of the current instruction value is decided. A correcting section corrects the current instruction value D which is outputted from a control section by the correction coefficient K obtained by the calibrating section and outputs to the pulse width modulating section.

REFERENCES:
patent: 4455520 (1984-06-01), Ward et al.
patent: 4757241 (1988-07-01), Young
patent: 5436545 (1995-07-01), Bahr et al.
patent: 5450306 (1995-09-01), Garces et al.
patent: 5526252 (1996-06-01), Erdman

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