A circuit for sensing a current comprises a substrate having a first and a second major surface, the second major surface being opposite to the first major surface. At least one magnetic field sensing element is arranged on the first major surface of the substrate and is suitable for sensing a magnetic field caused by a current flow in a current conductor coupled to the second major surface. The substrate also comprises at least one insulation layer, substantially buried between the first major surface and the second major surface of the substrate.

Current sensing techniques. In an example, a current sensing method includes: generating a first magnetic field measurement; generating a second magnetic field measurement; generating a frequency estimate of a current; calculating a root-mean-square (RMS) value of an estimated amplitude of the current; and generating a temperature estimate of an integrated circuit (IC) configured to perform the method. The method also includes generating a first weighting factor and a second weighting factor based on the frequency estimate, the RMS value, and the temperature estimate, the first weighting factor to control amplification of the first magnetic field measurement and the second weighting factor to control amplification of the second magnetic field measurement.

A current sensor comprises a magnetic field sensor and a T-shaped ferromagnetic structure having an air gap. The current sensor is arranged in a recess of a busbar.

A snap-on assembly includes a housing that holds an integrated circuit with a sensor. A connector supplies power to the integrated circuit and transmits a signal from the integrated circuit to an electronic circuit. An insert fits into an opening of the housing and secures a conductor in the housing without a mechanical fastener. The sensor measures a magnetic field resulting from a current traveling through the conductor.

A current sensor has at least one support element that is configured to carry at least one sensing coil of at least two sensing coils of the current sensor. The support element has at least one face on which at least one sensing coil is arranged. The sensing coil is to be used in connection with a current transferring conductor. The at least two sensing coils differ from each other in respect of at least one of an angular orientation of the individual sensing coil relative to a longitudinal axis of the current transferring conductor and/or a vertical distance of the individual sensing coil relative to the current transferring conductor.

A monitoring system includes an array of optical sensors disposed within a transformer tank. Each optical sensor is configured to have an optical output that changes in response to a temperature within the transformer tank. An analyzer is coupled to the array of optical sensors. The analyzer is configured to determine a sensed temperature distribution based on the sensed temperature. The sensed temperature distribution is compared to an expected distribution. Exterior contamination of the transformer tank is detected based on the comparison.

A method of sensing electrical power being provided to a structure using a sensing device, a calibration device, and one or more processing modules. The sensing device can include one or more magnetic field sensors. The sensing device can be attached to a panel of a circuit breaker box. The panel of the circuit breaker box can overlie at least a part of one or more main electrical power supply lines for an electrical power infrastructure of a structure. The calibration device can include a load unit. The calibration device can be electrically coupled to the electrical power infrastructure of the structure. The method can include automatically calibrating the sensing device by determining a first transfer function in a piecewise manner based on a plurality of ordinary power consumption changes in the structure. The method also can include determining a power consumption measurement using the one or more processing modules based on one or more output signals of the sensing device and the first transfer function. Other embodiments are provided.

A current sensor includes a primary conductor through which a current to be measured flows and a first magnetic sensor and a second magnetic sensor that each detects an intensity of a magnetic field generated by the current flowing through the primary conductor. The current is diverted into two flow channels and flows through the primary conductor in a length direction of the primary conductor. The primary conductor includes an arch portion that extends in the length direction while bending to project in one thickness direction of the primary conductor, and defines one of the two flow channels. The first magnetic sensor is disposed on an inner side of the arch portion and is located on a side of an undersurface of the primary conductor. The second magnetic sensor is located on a side of a surface of a portion of the primary conductor which defines the other one of the two flow channels.

A technique for an AMR-based sensing circuit allows current measurements over a wide frequency range. This is accomplished by folding the current carrying trace around the AMR sensor to concentrate and normalize the magnetic field generated by the current over a wide frequency range. Experimental results show that the sensor, when implemented with the proposed method, has an improved bandwidth of >10 MHz and enhanced sensitivity to high frequency currents evinced by the sensor output at DC or lower frequencies. The method is applicable for example in high frequency power converters where inductor current is used to control the ripple and transient response.

A current detection device includes: a first conductor providing a part of a current path between a first inverter and a first rotary electric machine; a second conductor providing a part of a current path between a second inverter and a second rotary electric machine; a third conductor providing a part of a current path between a DC power supply and a converter; and first to third elements respectively arranged to face the first to third conductors. Each of the first to third elements is configured to detect a magnetic flux generated by an electric current flowing through a corresponding conductor in a coreless manner. A maximum value of the electric current in the second conductor is smaller than maximum values of the electric current in the first and third conductors. The second conductor is arranged between the first conductor and the third conductor in a predetermined direction.