Patent ID: 7741983

Claim:
A method of measurement and calibrating a power conversion circuit including an input power node, an output power node and a capacitive device coupled between the input and output power nodes, the method comprising: measuring a voltage differential across the capacitive device to derive a pre-calibration voltage; setting a pair of switching elements of a calibration circuit tied to the output power node to permit a fixed known current to flow through the pair of switching elements; measuring a voltage across a resistance element of the calibration circuit, the resistance element being tied to at least one of the pair of switches; calibrating any errors associated with the power conversion circuit based on the measured voltage across the resistance element; re-measuring the voltage differential across the capacitive device after calibrating for any errors to derive a calibration voltage; deriving a calibrated voltage from the calibration voltage and the pre-calibration voltage; and storing the calibrated voltage in memory for use during operation of the power conversion circuit.