Patent ID: 7363186
Filing Date: 2008-04-22
Classification: G01R

Abstract:
1. A self calibrating control circuit comprising: a load; a current sensing device connected in series with said load; a high precision load device that includes a precision resistor, said high precision load device having known characteristics, said high precision load device being selectively connected across said load; and a calibration device connected to said current sensing device and said high precision load device, said calibration device monitoring an output voltage of a power supply electrically connected to said load and measuring a first load current flowing through said load without said high precision load device connected across said load, subsequent to measuring said first load current, said calibration device connects said high precision load device across said load and measures a second load current flowing through said load, said calibration device then determines a calibration current by dividing said power supply voltage by the resistive value of said precision resistor and an actual load current by the following formula: I I I