Method of sensing motor winding current in integrated...

Details Method of sensing motor winding current in integrated... Method of sensing motor winding current in integrated...

2007-03-06

2007-03-06

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S701000, C324S762010, C324S177000

Reexamination Certificate

active

11343762

ABSTRACT:
A method and motor controller for sensing motor winding current. An FET drive transistor has its ON resistance periodically increased to about five times the normal ON resistance for short sensing intervals during motor drive. An analog-to-digital converting senses the voltage across this FET during the sensing intervals. The resulting digital signal is used to calculate motor current. The time at high ON resistance is much less than the time at normal. The ON resistance can be changed using two FETs or one FET with gate fingers over differing parts of the channel region.

REFERENCES:
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patent: 5867001 (1999-02-01), Lagerquist et al.
patent: 5959417 (1999-09-01), Maggio et al.
patent: 7034542 (2006-04-01), Peterson
patent: 7068062 (2006-06-01), Kitagawa et al.
patent: 02073598 (1990-03-01), None

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