Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Reexamination Certificate
2008-05-14
2009-12-29
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
C327S112000, C318S256000, C318S434000, C361S079000
Reexamination Certificate
active
07639050
ABSTRACT:
In a load-drive controller, a first comparing unit compares a load current supplied from an H bridge circuit and a desired setting current; a PWM control unit generates a control signal to control the load current; a gate driver drives and controls output transistors of the H bridge circuit based on the control signal, and a load current monitoring unit determines which is larger a level shift equivalent value of the setting current or a peak hold equivalent value of the load current, and the PWM control unit controls increase or decrease of the load current based on a comparison result of the first comparing unit and on a determination result of the load current monitoring unit, so that the load current quickly reaches the setting current of a micro step drive during decrease of the setting current.
REFERENCES:
patent: 7142050 (2006-11-01), Risbo
patent: 9-219995 (1997-08-01), None
patent: 2005-184897 (2005-07-01), None
Donovan Lincoln
Panasonic Corporation
RatnerPrestia
Rojas Daniel
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