Current detector

摘要

A current detector that detects, based on output signals of N coreless current sensors, where N is a natural number of 3 or more, currents flowing in N conductors in a circuit connected so that the sum of the currents flowing in the N conductors becomes zero. The current detector has a signal-current correlation acquiring section that acquires a signal-current correlation representing a correlation between the output signals of the N coreless current sensors and the currents flowing in the N conductors. Furthermore, a current calculating section that calculates the currents flowing in the N conductors based on the output signals of all the N coreless current sensors by using the signal-current correlation.

主权项

1. A current detector that detects, based on output signals of N coreless current sensors (where N is a natural number of 3 or more), currents flowing in N conductors in a circuit connected so that a sum of the currents flowing in the N conductors becomes zero, comprising:
a signal-current correlation acquiring section that acquires a signal-current correlation representing a correlation between the output signals of the N coreless current sensors and the currents flowing in the N conductors; a current calculating section that calculates the currents flowing in the N conductors based on the output signals of all the N coreless current sensors by using the signal-current correlation; an inter-signal correlation acquiring section that acquires an inter-signal correlation representing a correlation between each output signal from (N−1) coreless current sensors and an output signal of a remaining one coreless current sensor, the inter-signal correlation being derived based on such a relation that the sum of the currents flowing in the N conductors becomes zero and the signal-current correlation; and an abnormality determining section that determines if the output signals of the N coreless current sensors are normal or abnormal, wherein if it is determined that the output signal of any one of the N coreless current sensors is abnormal, the current calculating section estimates the output signal of the coreless current sensor determined to be abnormal, based on the output signals of all the normal (N−1) coreless current sensors by using the inter-signal correlation, and calculates the currents flowing in the N conductors based on the estimated output signal and the output signals of all the normal (N−1) coreless current sensors by using the signal-current correlation.