A current detection device (100) includes a shunt resistor (1) connected in series to a path through which a current flows; a first circuit (2) that converts a voltage across the shunt resistor (1) into a predetermined differential voltage; a second circuit (3) to which the predetermined differential voltage is input from the first circuit (2) via a pair of wirings (55) and that amplifies the predetermined differential voltage; a constant current circuit (4) connected between the pair of wirings (55); and an arithmetic circuit (5) that operates the current flowing through the path based on the voltage amplified by the second circuit (3).

An isolated voltage probe includes: a conductor including a positive lead, a negative lead, and a resistance via which the positive lead and the negative lead are connected to each other; a magnetic sensor for measuring a magnetic field in a non-contact manner, the magnetic field being generated by a current flowing through the conductor; and a coaxial cable for transmitting a signal that is based on an output supplied from the magnetic sensor.

An isolated voltage probe includes: a conductor including a positive lead, a negative lead, and a resistance via which the positive lead and the negative lead are connected to each other; a magnetic sensor for measuring a magnetic field in a non-contact manner, the magnetic field being generated by a current flowing through the conductor; and a coaxial cable for transmitting a signal that is based on an output supplied from the magnetic sensor.

A current sensor wound and mounted in a coil shape with at least one winding around a measurement conductor where a primary current flows, the current sensor including: an insulated electrical wire including a core wire having a flexible rod-shaped body and an insulating covering portion covering an outer periphery of the core wire; and a coil thin wire having one end electrically connected to one end side of the core wire, and functioning as a secondary coil by being spirally wound around an outer periphery of the insulating covering portion, wherein an other end of the core wire and an other end of the coil thin wire, which are not electrically connected, are used as output terminals.

A system includes a power converter including a primary bridge unit to receive a primary voltage from a voltage source, the primary bridge unit includes a first plurality of electronic switches, and each of the first plurality of electronics switches has a turn ON time and a turn OFF time. Further, the power converter includes a transformer including a primary winding and a secondary winding, the primary winding is coupled to the first plurality of electronic switches. Also, the power converter includes a secondary bridge unit including a second plurality of electronic switches coupled to the secondary winding. Additionally, the system includes a controller to determine an inductance of the power converter based on the primary voltage, the turn ON time of the first plurality of electronic switches, a switching cycle time of the power converter, and one of an average current and a peak current in the power converter.

A system includes a power converter including a primary bridge unit to receive a primary voltage from a voltage source, the primary bridge unit includes a first plurality of electronic switches, and each of the first plurality of electronics switches has a turn ON time and a turn OFF time. Further, the power converter includes a transformer including a primary winding and a secondary winding, the primary winding is coupled to the first plurality of electronic switches. Also, the power converter includes a secondary bridge unit including a second plurality of electronic switches coupled to the secondary winding. Additionally, the system includes a controller to determine an inductance of the power converter based on the primary voltage, the turn ON time of the first plurality of electronic switches, a switching cycle time of the power converter, and one of an average current and a peak current in the power converter.

A downsized current sensor with a switch function is disclosed. The current sensor includes: a magnetic circuit to converge a magnetic flux generated from an electric circuit at a magnetic sensor; a switch to open and close the electric circuit in a way that operates together with a movable magnetic body configuring a part of the magnetic circuit; and a magnetizing coil to generate magnetic force enabling the movable magnetic body to be attracted to a fixed magnetic body configuring a part of the magnetic circuit.

A system includes a sensor configured to detect an electrical leakage current associated with an operation of an industrial machine. The sensor includes a core and a first winding encircling a first portion of the core. The first winding includes a first number of turns. The first winding is configured to obtain a set of electrical current measurements associated with the operation of the industrial machine. The sensor includes a second winding encircling a second portion of the core. The second winding includes a second number of turns. The second winding is configured to obtain the set of electrical current measurements associated with the operation of the industrial machine. The first winding and the second winding are each configured to generate respective outputs based on the set of electrical current measurements. The respective outputs are configured to be used to reduce the occurrence of a distortion of the set of electrical current measurements based on a temperature of the core.

An electric circuit for measuring a current flowing in a conductor comprising: 2×N coils, N being an integer greater than or equal to 2, connected in series together; and a common mode filtering element associated with each of the 2×N coils, each filtering element being placed in parallel with the associated coil and being able to accomplish common mode filtering of the 2×N coils, a core of the 2×N coils having a relative permeability less than 10, and among the 2×N coils, N coils being wound in a direction opposite to the winding direction of the N other coils.

A holder for a current sensor having separable portions with inner surfaces forming an opening and opposing outer surfaces having a groove to accommodate a current sensing coil. The holder includes flexible members on the portions and extending toward the opening such that the flexible members can hold a power cable substantially centered within the opening and concentric with the current sensing coil. The portions are joined together with a hinge pivotally mounted between them at one end and a releasable clasp joining them together at another end, providing for ease of installation around the power cable by hand and without requiring tools or additional fasteners.