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Current sensor operating in accordance with the principe of compensation

By using a pulse width and density modulated switching mode amplifier in the closed-loop current sensor and adjusting the switching frequency according to the output current, the problem of semiconductor loss at high current and ripple at low current is solved, and a low-loss and low-cost design is achieved. Simplifies the design of electronic components and filters.

Active Publication Date: 2012-10-31
ASEA BROWN BOVERI AG
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AI Technical Summary

Problems solved by technology

This results in considerable semiconductor losses at high current levels, as well as some design constraints such as size and cost of electronic components

Method used

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Examples

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Effect test

Embodiment Construction

[0036] in Figure 1 to Figure 8 Components with the same function and working mode are provided with the same reference numbers.

[0037] figure 1 The closed loop current sensor structure 1 is schematically shown. The sensor is based on a magnetic circuit including a magnetic core 2 of high magnetic permeability material. The magnetic core 2 surrounds the primary coil 3, which has a plurality of primary windings Np in which the current Ip is to be measured. in figure 1 In the structure shown, the primary coil 3 consists of only one winding. The flux sensor element 4 located in the air gap 5 of the magnetic core 2 will detect any magnetic flux induced in the magnetic circuit and will generate a proportional signal.

[0038] In the active operating mode of the closed-loop sensor, the signal of the flux sensor element is amplified by the electronic power stage as a component of the booster circuit 6 at a low current frequency.

[0039] The secondary current will be generated at a hi...

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PUM

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Abstract

The invention relates to a current sensor operating in accordance with the principle of compensation, comprising - a primary winding through which the current to be measured flows, creating a magnetic field, - a secondary winding, through which a compensation current flows, which generates a magnetic field compensating the primary winding, - a magnetic core ... - a terminating resistor connected in series to the secondary winding, - sensor means, which are exposed to the resulting magnetic field of the primary and secondary windings, - a booster circuit connected downstream of the sensor means which feeds the compensation current to the secondary winding via the terminating resistor, whereby the booster circuit comprises a switched mode amplifier with a pulse width and density modulator that operates based on pulse width and density modulation, turning the compensation current into a pulse width and density modulated current, with a switching frequency that is a function of the compensation current in the sense that the switching frequency is high at small currents and low at high currents.

Description

Technical field [0001] The present invention relates to a current sensor that works according to the principle of compensation. The current sensor includes a primary coil winding through which a current to be measured flows and establishes a magnetic field. The current sensor also includes a secondary coil winding through which a compensation current flows. Coil winding, the compensation current generates another magnetic field to locally compensate the magnetic field generated by the primary coil winding. The current sensor also includes an air gap magnetic core, which is magnetically coupled with the two windings and concentrates the resulting magnetic field into its air gap The current sensor further includes a terminating resistor connected in series with the secondary coil winding, the current sensor further includes a sensor device that is located in the air gap and is exposed to the obtained magnetic fields of the primary winding and the secondary winding, and the current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R15/202G01R15/185G01R33/0005G01R33/07
Owner ASEA BROWN BOVERI AG
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