Electrical power measurement method, e.g. for use in a power calculation engine for measuring three phase power outputs, employs delta signal modulators, low pass digital filters, multiplication and summation steps

摘要

Method for determining electrical power values using an analogue to digital converter, whereby a first measurement value (a) from a first delta signal modulator (MA) is converted into a bit-stream (Ba) that is filtered through a digital low pass filter to form a value sequence. A second measurement value (b) is passed through a similar processing path, while being delayed by a filter time characteristic before being multiplied by a filter value and summed in an accumulator (S). An independent claim is made for a method for determining electrical effective values using an analogue to digital converter. The invention also relates to a corresponding device.