A magnetic sensor whose output characteristic is less sensitive to the environmental temperature is provided. Magnetic sensor 1 has free layer 24 whose magnetization direction changes in response to an external magnetic field, pinned layer 22 whose magnetization direction is fixed with respect to the external magnetic field, spacer layer 23 that is located between pinned layer 22 and free layer 24 and that exhibits a magnetoresistance effect, and at least one magnet film 25 that applies a bias magnetic field to free layer 24. The film thickness of the magnet film is 15 nm or more and 50 nm or less. The relationship of 0.7≤T.sub.C_HM/T.sub.C_FL≤1.05 is satisfied, where T.sub.C_HM is Curie temperature of the magnet film, and T.sub.C_FL is Curie temperature of the free layer.

A cable condition monitoring sensor device includes a TMR magnetic field sensor module, a high-pass filtering module, and a signal-amplifying module which are sequentially connected. The TMR magnetic field sensor module measures a magnetic field change signal of a cable, converts the same into a voltage signal, and outputs the voltage signal to the high-pass filtering module. The high-pass filtering module filters out DC bias of the voltage signal, and transmits the filtered voltage signal to the signal-amplifying module. The signal-amplifying module amplifies the filtered voltage signal to obtain an output voltage signal and outputs the output voltage signal. In the present invention, a common mode current to be measured in the cable is extracted by placing the magnetic shielding ring made of ferromagnetic material outside the cable to filter out a differential mode load current in the cable, and the magnitude of the common mode current is determined.

According to one embodiment, a sensor includes an element part, and a control circuit part. The element part includes first and second elements. Each of the first and second elements includes a first magnetic element and a first conductive member. The control circuit part includes a first current circuit, a differential circuit, and a phase detection circuit. The first current circuit is configured to supply a first current to the first conductive member. The differential circuit is configured to output a differential signal corresponding to a difference of a first signal and a second signal. The first signal corresponds to a change in a first electrical resistance of the first magnetic element of the first element, The second signal corresponds to a change in a second electrical resistance of the first magnetic element of the second element. The phase detection circuit is configured to perform a phase detection of the differential signal.

A system having a control unit, which has a housing in which at least one processing unit of the control unit is situated. The system further includes an electrical ground connection situated outside the housing; a first ground line by which the control unit and the ground connection are electrically connected; a second ground line by which the control unit and the ground connection are electrically connected; and a sensor device, which is developed to monitor an electrical first ground current flowing through the first ground line and an electrical second ground current flowing through the second ground line. The sensor device has an XMR sensor for monitoring the first and the second ground current.

A current sensor includes a conductor, and first and second magnetic sensing elements. The first magnetic sensing element is positioned such that the magnetic field component in the second direction of the magnetic field generated by the measurement target current flowing through the first conductor portion is opposite in polarity to the magnetic field component in the second direction of the magnetic field generated by the measurement target current flowing through the third conductor portion. The second magnetic sensing element is positioned such that the magnetic field component in the second direction of the magnetic field generated by the measurement target current flowing through the second conductor portion is opposite in polarity to the magnetic field component in the second direction of the magnetic field generated by the measurement target current flowing through the third conductor portion.

A device for measuring electric currents includes multiple current sensors of Rogowski type, each suitable for measuring an electric current flowing through an electrical conductor, these current sensors being in adjacent pairs and each including coils for measuring the current and a central aperture for receiving the corresponding electrical conductor. Each current sensor includes two of the coils, which coils are positioned in parallel and facing one another on opposite edges of the central aperture and two ferromagnetic bars extending between ends of the coils, perpendicularly to a longitudinal axis of the coils.

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.

An electronic fuse for a power supply includes at least two switching elements and a regulation unit, wherein a first switching element is arranged in a main branch, where the regulation unit is switches off the first switching element when a predetermined threshold value is exceeded by a prevailing current value, and a second switching element that is also actuated by the regulation unit, which is arranged in an auxiliary branch parallel to the first switching element and assumes a substantial proportion of a resulting power loss when an overload occurs, and the second switching element, which is arranged in at least one auxiliary branch, is configured or optimized for linear operation, and where the at least two switching elements are configured such that the line resistance of the second switching element is at least twice the line resistance of the first switching element.

Methods and apparatus for a current sensor having an elongate current conductor having an input and an output and a longitudinal axis. First, second, third and fourth magnetic field sensing elements are coupled in a bridge configuration and positioned in a plane parallel to a surface of the current conductor such that the second and fourth magnetic field sensing elements comprise inner elements and the first and third magnetic field sensing elements comprise outer elements. Embodiments of the sensor reduce the effects of stray fields on the sensor.

According to one embodiment, a sensor includes an element part, and a control circuit part. The element part includes first and second elements. Each of the first and second elements includes a first magnetic element and a first conductive member. The control circuit part includes a first current circuit, a differential circuit, and a phase detection circuit. The first current circuit is configured to supply a first current to the first conductive member. The differential circuit is configured to output a differential signal corresponding to a difference of a first signal and a second signal. The first signal corresponds to a change in a first electrical resistance of the first magnetic element of the first element. The second signal corresponds to a change in a second electrical resistance of the first magnetic element of the second element. The phase detection circuit is configured to perform a phase detection of the differential signal.