Method for calibrating a motor control circuit to improve...

Details Method for calibrating a motor control circuit to improve... Method for calibrating a motor control circuit to improve...

2011-06-28

2011-06-28

Nguyen, Vincent Q (Department: 2858)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

C324S510000

Reexamination Certificate

active

07969138

ABSTRACT:
A method enables measurement of an inverter loss within a motor control circuit for an appliance. The method includes applying a constant DC current generated from a first AC supply voltage to a motor winding through an inverter at a first duty cycle, measuring a first voltage corresponding to the current through the motor at a motor current sense resistor, computing a first ratio of the first measured voltage at the motor current sense resistor to a first DC input voltage corresponding to the first AC supply voltage, identifying a second duty cycle from the first computed ratio, comparing the second duty cycle to the first duty cycle, and identifying a first inverter loss factor from the difference between the first duty cycle and the second duty cycle.

REFERENCES:
patent: 5811956 (1998-09-01), Yamamoto
patent: 6593751 (2003-07-01), Takahashi
patent: 6690137 (2004-02-01), Iwajj et al.
patent: 6949945 (2005-09-01), Klein
patent: 7265954 (2007-09-01), Hikawa et al.
patent: 2006/0179895 (2006-08-01), Thorn et al.

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