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Analytical circuit for current sensor working on compensation principle, particular for measurement of dc and ac, and method for operation of said current sensor

A technology of current sensor and compensation principle, applied in the direction of voltage/current isolation, using DC to AC for measurement, instruments, etc.

Inactive Publication Date: 2006-03-01
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there are problems with the direct conversion of the conventional peak rectification of the detection signal into an integrated switching loop

Method used

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  • Analytical circuit for current sensor working on compensation principle, particular for measurement of dc and ac, and method for operation of said current sensor
  • Analytical circuit for current sensor working on compensation principle, particular for measurement of dc and ac, and method for operation of said current sensor
  • Analytical circuit for current sensor working on compensation principle, particular for measurement of dc and ac, and method for operation of said current sensor

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Embodiment Construction

[0036] figure 1 The basic structure of a compensated current converter with the evaluation circuit according to the invention is shown. The left side shows the magnetic part, which contains a main core 1 with primary winding W1 and compensation winding W2 and a flux detector 2 . The primary coil W1 conducts the measurement current i1 and has a much smaller number of turns than the compensating coil W2 , sometimes only one turn. The flux detector 2 is formed, for example, from a Vitrovac(R) strip and a sensor coil W3.

[0037] A controller 3 (an oscillator) activates the magnetic field detector 2 . This is followed by an evaluation circuit with circuit blocks 4 to 7 (which will be described in more detail below) and an output stage 8 operating in switching operation in order to regulate the compensating current i2 such that the magnetic flux is zero. In this case, the compensation current i2 reflects the primary current i1 and can be further processed. exist figure 1 In th...

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Abstract

Signal processing according to the invention permits a complete digital implementation of the control electronics and thus a cost reduction due to complete integration in an ASIC. The magnetic field probe is, for example, supplied with a square wave voltage of determined frequency, by means of resistors, the probe signal is recorded by one or two comparators and the pulse width is digitally measured by counters. Furthermore the conventional analogue final stage for the compensation current is replaced by a PWM end stage with a series connected sigma-delta modulator. A synchronisation with a set synchronisation signal ( for example from the measured value processing) is possible.

Description

technical field [0001] The invention relates to a current sensor based on a compensation principle, in particular for measuring direct currents and alternating currents, wherein the magnetic field generated by the magnetic core of the primary coil through which the current to be measured flows is compensated by a compensation current of the secondary coil , wherein, in order to control the compensation current, at least one sensor affected by the magnetic field measures the deviation of the total magnetic potential and zero magnetic flux, and transmits it as a measurement signal to an amplifying device used to obtain the compensation current through an analysis circuit, the During switching operation, the amplification device controls the compensation current corresponding to a pulsed control signal generated by the control circuit as a function of the measured values. Background technique [0002] Such current sensors are also known technically as compensating current conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/18G01R19/20
CPCG01R15/185
Inventor 汉斯-乔格·科普肯
Owner SIEMENS AG