Abstract: 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.

Abstract: Disclosed are a self-assembled catalase nanoparticle and a preparation method therefor and the use thereof. The self-assembled catalase nanoparticle of the present invention is obtained by dissolving catalase freeze-dried powder to obtain a catalase solution, adjusting the pH value of the catalase solution, and then centrifugating or filtering same to obtain a supernatant or a filtrate, and further thermally incubating the supernatant or filtrate. The self-assembling catalase nanoparticle of the present invention can be used in medicines or food products that promote immune cell growth and regulate organic immunity.

Abstract: Two ferromagnetic elements are disclosed that delimit a region for an electrical conductor, in which a current intensity should be measured. Each ferromagnetic element has an end surface. The end surfaces of the two ferromagnetic elements face each other and delimit an air gap. A magnetic field sensor is arranged in the air gap or near the air gap. The region delimited by the ferromagnetic elements is open on a side opposite the air gap and can thus receive the electrical conductor. The current intensity is measured by means of a magnetic field measurement. The ferromagnetic elements can be, in particular, L-shaped.

Abstract: The invention provides a sensing circuit having a driving apparatus, that is, a current drive circuit and a voltage drive circuit. The current drive circuit drives a sensor in a current drive mode, and the voltage drive circuit drives the sensor in a voltage drive mode. The sensing circuit further has a switch apparatus connected to the driving apparatus for controlling the driving apparatus, to enable the driving apparatus to switch between the current drive mode and the voltage drive mode. A temperature testing circuit with a negative temperature coefficient thermistor is further used to sense ambient temperature of the sensor, and the input voltage of the switch apparatus is changed by means of that the resistance of the thermistor changes as the temperature changes, so as to control on and off of the switch apparatus, to switch the drive mode of the sensor.

Abstract: The invention provides a sensing circuit having a driving apparatus, that is, a current drive circuit and a voltage drive circuit. The current drive circuit drives a sensor in a current drive mode, and the voltage drive circuit drives the sensor in a voltage drive mode. The sensing circuit further has a switch apparatus connected to the driving apparatus for controlling the driving apparatus, to enable the driving apparatus to switch between the current drive mode and the voltage drive mode. A temperature testing circuit with a negative temperature coefficient thermistor is further used to sense ambient temperature of the sensor, and the input voltage of the switch apparatus is changed by means of that the resistance of the thermistor changes as the temperature changes, so as to control on and off of the switch apparatus, to switch the drive mode of the sensor.