A self-powered current sensor is described. The self-powered current sensor including an electrical signal input configured to receive a current signal. Further, the self-powered current sensor includes a power circuit configured to generate a power voltage from an electrical signal. The self-powered current sensor also includes a variable resistor configured to set a value corresponding to one or more indicators on the electrical sensor and an amplifier coupled with a variable resistor and a power circuit. And, the self-powered current sensor includes an alarm coupled with an amplifier, an alarm configured to activate based on a value set by said variable resistor.

A current sensing circuit includes a current detection unit having a first resistance element; a first MOS-transistor and a first constant current source connected between a first output end of the current detection unit and a ground terminal; a second MOS-transistor and a second constant current source connected between a second output end of the current detection unit and the ground terminal; a third MOS-transistor having a source connected to the first output end and a gate connected to a drain of the second MOS-transistor; a second resistance element connected between an output terminal and the ground terminal; and a high withstand-voltage MOS-transistor connected between the third MOS-transistor and the output terminal to receive a predetermined control voltage, wherein the gates of the first and second MOS-transistors are commonly connected, and the gate of the first MOS-transistor is connected to the drain thereof.

A hybrid current sensor assembly has a conductor, Hall core, Hall sensor, shunt terminal, and a microprocessor. The conductor has a first terminating end and a second terminating end. The Hall core generates a magnetic field from current flow in the conductor. The Hall sensor measures potential difference between first terminating end and the second terminating end of the conductor based on the magnetic field applied to the Hall core. The shunt terminal is positioned on a central portion of the conductor. The microprocessor is connected to the shunt terminal to measure the current flow in the conductor.

A method for producing a device for measuring current intensities, including: providing a resistor arrangement having connection elements and a resistor element arranged therebetween in a current flow direction. The resistor element and the connection elements consist of different electrically conductive materials; forming a contact pin from the material of at least one connection element; positioning a printed circuit board with a conductor track and a passage bore on the resistor arrangement such that the contact pin projects through the passage bore and has on the side of the printed circuit board facing away from the resistor arrangement a protrusion; laterally widening the contact pin in the region of the protrusion by deforming the material such that the printed circuit board is mechanically fixed to the resistor arrangement; and producing an electrically conductive connection between the contact pin and the conductor track of the printed circuit board.

Techniques for improving current sensing via a shunt resistance are provided. In an example, an apparatus for sensing current can include a substrate, and a plurality of metal layers stacked on the substrate and separated from the substrate and from each other by an insulation material. In certain examples, a first one or more metal layers can form a sense resistance configured to pass current between a source and a load, and a second one or more metal layers can form one or more gain resistances coupled to the sense resistance and configured to couple to a current sense amplifier. In some example, a metal layer can include portions of both the sense resistance and the gain resistance to compensate for environmental anomalies, material anomalies or manufacturing anomalies.

A shunt resistor module which is coupled to a printed circuit board to be used for current measurement, includes: a resistor portion configured to have predetermined resistance; at least two terminal portions configured to extend from opposite ends of the resistor portion; lead pins fixed to first sides of the terminal portions to protrude to be electrically connected to the printed circuit board; and an exterior member formed to at least partially cover first surfaces of the terminal portions and to have pin holes opened to expose the lead pins and screw holes formed to be screwed to the printed circuit board.

A system current sensor module can accurately sense or measure system current flowing through a sense current resistor by shunting current through a gain-setting resistor and using an amplifier to measure a resulting voltage, with an output transistor controlled by the amplifier controlling current through the gain setting resistor in a manner that tends to keep the amplifier inputs at the same voltage. The resistors can be thermally coupled to maintain similar temperatures when a system current is flowing. The thermal coupling can include conducting heat from a first resistor layer carrying the current sense resistor to a thermal cage layer located beyond a second resistor layer carrying the gain-setting resistor. This preserves accuracy, including during aging.

A current sensing circuit is provided for measuring a current in an electrical line connecting an electrical supply to a load. The current sensing circuit includes a magnetic circuit having: a magnetic core, a reference winding wound around the magnetic core, and a conductor passing through center of the magnetic core. The conductor is being connected to the electrical line. The current sensing circuit further includes a detection circuit connected to the reference winding of the magnetic circuit. The detection circuit is configured to detect a change in condition of the magnetic core and generate a detection signal in response to determination of the change. Furthermore, the current sensing circuit includes a controller coupled to the detection circuit for receiving the detection signal. The controller measures the current in the electrical line in response to the detection signal from the detection circuit.

A current-measuring unit, especially for measuring a battery current in a vehicle, includes a printed circuit board (12) and a first bus bar (16) leading to and fixed at the printed circuit board that provides at least one first shunt contact surface (30). A second bus bar (18) leading to and fixed at the printed circuit board provides at least one second shunt contact surface (42). A first measuring strip conductor (44) is associated with the first bus bar at the printed circuit board. A second measuring strip conductor (46) is associated with the second bus bar at the printed circuit board. A shunt resistor (48) has a first contact area (50) connected by soldering to the first bus bar and to the first measuring strip conductor and has a second contact area (52) connected by soldering to the second bus bar and to the second measuring strip conductor.

An apparatus for analyzing currents in an electric load is provided with a current measuring circuit, which can be connected in series with the parallel circuit of the load branches, and a detector for detecting a change in the current when the switching element in a load branch is switched on or off. The apparatus also has an analysis unit which is connected to the control unit and to the detector and analyzes the temporal correlation of a control signal for switching a switching element in a load branch on or off with the detection of the change in the current and/or analyzes the change in the current at a plurality of times of switching a relevant switching element in a load branch or the switching elements in a plurality of load branches.