CURRENT MEASUREMENT DEVICE

摘要

A current measurement device includes: an integration circuit which integrates the current to be measured, and outputs an integral signal; a low range current measurement unit which receives the integral signal output from the integration circuit and calculates a low range current measurement value that is proportional to the rate of change of the integral signal; a high range current measurement unit which calculates a high range current measurement value based on a pulse signal corresponding to the cycle of the integral signal; a pumping circuit which, using the pulse signal, discharges a charge stored in the integration circuit; and a measurement value determination unit which determines a measurement value of the current to be measured based on the low range current measurement value calculated by the low range current measurement unit, and the high range current measurement value calculated by the high range current measurement unit.

主权项

1. A current measurement device, a current measurement range of a current to be measured by the current measurement device being divided into at least a low range and a high range, the current measurement device carrying out current measurement in each of the low range and the high range, the current measurement device comprising:
an integration circuit configured to integrate the current to be measured and output an integral signal; a low range current measurement unit configured to receive the integral signal output from the integration circuit and calculate a low range current measurement value that is proportional to a rate of change of the integral signal; a high range current measurement unit configured to calculate a high range current measurement value based on a pulse signal corresponding to a cycle of the integral signal output from the integration circuit; a pumping circuit configured to discharge charge stored in the integration circuit based on the pulse signal; and a measurement value determination unit configured to determine a measurement value of the current to be measured based on the low range current measurement value calculated by the low range current measurement unit and the high range current measurement value calculated by the high range current measurement unit.