Current sensing devices that are capable of surviving harsh ambient environment of ocean worlds, such as Jupiter and Saturn moons are disclosed. The described devices can meet 300 Krad radiation requirements and can survive at cold temperatures down to −184° C. Exemplary implementations of the constituent circuits of the devices are presented. A scheduling algorithm to perform various measurement by the disclosed current sensing devices is also described.

A detection apparatus for unbalanced DC link capacitor voltage, the DC link provides a DC voltage and includes a plurality of capacitors coupled in series to two ends of the DC link and a plurality of balanced resistors coupled in series to two ends of the DC link and corresponding to the capacitors. The detection apparatus includes a plurality of sense resistors and a current sensor. One end of each sense resistor is coupled to a common-connected node of two capacitors, and the other end thereof is coupled to a common-connected node of two balanced resistors. The current sensor is coupled to one of the sense resistors and measures a current value of a current flowing through the sense resistor coupled to the current sensor.

A detection apparatus for unbalanced DC link capacitor voltage, the DC link provides a DC voltage and includes a plurality of capacitors coupled in series to two ends of the DC link and a plurality of balanced resistors coupled in series to two ends of the DC link and corresponding to the capacitors. The detection apparatus includes a plurality of sense resistors and a current sensor. One end of each sense resistor is coupled to a common-connected node of two capacitors, and the other end thereof is coupled to a common-connected node of two balanced resistors. The current sensor is coupled to one of the sense resistors and measures a current value of a current flowing through the sense resistor coupled to the current sensor.

Method and system for measuring electrical quantities. The method comprising: the dispatching of a synchronization message on a data bus, by a synchronization module connected to the data bus, the dispatching being carried out with an emission period, the emission period being counted down with the aid of a first clock of the synchronization module; the reception of the synchronization message, by measurement modules connected to the data bus, each measurement module comprising a sensor adapted to measure an electrical quantity, each measurement module also comprising a second clock; the countdown, by each measurement module that has received the synchronization message, of a first waiting duration, the countdown being carried out, for each of the said measurement modules, using the second clock belonging to this measurement module; and for each of the said measurement modules, the measurement of the electrical quantity by means of the corresponding sensor, at the end of the countdown of the first waiting duration.

A measurement apparatus has a current sensor and at least one A/D converter, which current sensor has at least two channels (CH1, CH2), via which channels (CH1, CH2) the current sensor (30) respectively provides a measurement signal (CH1_SIG, CH2_SIG) characterizing the current. The at least two channels (CH1, CH2) include a first channel (CH1) and a second channel (CH2), which second channel (CH2) is designed to measure a greater maximum current than the first channel (CH1). Also described is a method for measuring a current flowing through a conductor by way of the measurement apparatus.

A measurement apparatus has a current sensor and at least one A/D converter, which current sensor has at least two channels (CH1, CH2), via which channels (CH1, CH2) the current sensor (30) respectively provides a measurement signal (CH1_SIG, CH2_SIG) characterizing the current. The at least two channels (CH1, CH2) include a first channel (CH1) and a second channel (CH2), which second channel (CH2) is designed to measure a greater maximum current than the first channel (CH1). Also described is a method for measuring a current flowing through a conductor by way of the measurement apparatus.

A current sensor circuit comprises multiple resistive circuit elements of different values of electrical resistance arranged between at least one input terminal of the current sensor circuit and an output terminal; a first plurality of switching circuits coupled between the input terminal and the resistive circuit elements, wherein each switching circuit of the first plurality of switching circuits includes a pair of transistors connected in series; at least one drive amplifier including an output and an input connected to the output terminal; and a second plurality of switching circuits, each switching circuit including a first switch terminal coupled to the at least one drive amplifier output and a second switch terminal coupled to a common connection of a pair of transistors of the first plurality of switching circuits.

A current sensor circuit comprises multiple resistive circuit elements of different values of electrical resistance arranged between at least one input terminal of the current sensor circuit and an output terminal; a first plurality of switching circuits coupled between the input terminal and the resistive circuit elements, wherein each switching circuit of the first plurality of switching circuits includes a pair of transistors connected in series; at least one drive amplifier including an output and an input connected to the output terminal; and a second plurality of switching circuits, each switching circuit including a first switch terminal coupled to the at least one drive amplifier output and a second switch terminal coupled to a common connection of a pair of transistors of the first plurality of switching circuits.

An abnormality detection method according to one aspect of the present disclosure is a method of detecting an abnormality in an AC signal to be input from an AC power supply. The method includes, where an ideal AC signal is represented as V.sub.0 sin ωt (V.sub.0: amplitude, co: angular frequency, t: time), calculating an arithmetic value including a value represented by sin.sup.2ωt+cos.sup.2ωt and determining that the AC signal is abnormal when the arithmetic value is out of a threshold range.

A measurement circuit comprises an input terminal to receive a current signal, a first circuit branch coupled to the first terminal and including one or more circuit elements to receive a portion of the current signal, a second circuit branch coupled to the first terminal and including one or more additional circuit elements to receive another portion of the current signal, a nonlinear circuit element coupling the first circuit branch to the second circuit branch, and a quantization circuit configured to produce an input current measurement of current in the first and second circuit branches, and to include current in the second circuit branch in the input current measurement according to a magnitude of the input current signal.