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Method and device for digitizing an analog electrical signal and method for digitizing

An electrical signal and signal technology, applied in the direction of analog-to-digital converter, analog-to-digital conversion, electrical components, etc., can solve the problems of complex and laborious, inverse operation, difficult temperature compensation, etc.

Inactive Publication Date: 2011-01-26
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Logarithmic amplifiers are also known, but of course they must first be operated with complex and laborious analog techniques
The inverse operation in a downstream digital section is expensive and difficult to make the necessary temperature compensation

Method used

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  • Method and device for digitizing an analog electrical signal and method for digitizing
  • Method and device for digitizing an analog electrical signal and method for digitizing
  • Method and device for digitizing an analog electrical signal and method for digitizing

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Embodiment Construction

[0021] figure 1 A block diagram of a device for digitizing an analog electrical signal Sa is shown. The device has a plurality (here three) of sub-channels SK1 , SK2 , SK3 connected in parallel, to which the signal Sa is simultaneously applied. The signal Sa is then amplified in each subchannel SK1 , SK2 , SK3 (signal amplification section A1 , A2 , A3 ) before the signal is supplied to the input of the AD converter ADC1 , ADC2 , ADC3 . The output values ​​of the AD converters ADC1 , ADC2 , ADC3 then enter a common digital signal processor DSV, which receives the values ​​(receiver UE) and forms and outputs the total digital value Sd therefrom.

[0022] The AD converters ADC1 , ADC2 , ADC3 are here identical in each case in the exemplary embodiment (but it is also possible to use different AD converters in each sub-channel SK1 , SK2 , SK3 ).

[0023] The amplitude of the signal Sa is within the total amplitude range (total dynamic range) D, and D is 24Bit. When the resoluti...

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Abstract

A method and a device are disclosed for digitizing an analog electrical signal (Sa), in which the signal is applied to a number of subchannels (SK1, SK2, SK3) connected in parallel. In at least one embodiment, the amplitude ranges (AB1, AB2, AB3) of immediately adjacent subchannels with respect to amplitude are in each case displaced overlapping one another, in which the overlapping amplitude ranges (AB1, AB2, AB3) include the total amplitude range (D), in which a subchannel (SK3) serves as reference channel, in which, on the basis of the reference channel, the digital output value of the immediately adjacent subchannel (SK1 or SK2) with respect to amplitude is corrected when the signal (Sa) is in the overlap range of the two subchannels (SK1, SK2 or SK2, SK3) and the digital values differ from one another, and in which a total digital value is output by way of a digital output value, taking into consideration the displacements (V) of the amplitude ranges (AB1, AB2, AB3) with respect to one another.

Description

technical field [0001] The invention relates to a method and a device for digitizing analog electrical signals according to the preambles of claims 1 and 9 . Background technique [0002] Devices (and associated methods) for digitizing, in particular analog voltages, are generally known as AD (Analog-Digital) converters. Problems exist if the digitization is to be performed over a large dynamic range, for example 22 bits or more. It is therefore necessary for circuit breakers to detect alternating currents in the range from 20A to 800000A. With an accuracy of 1%, a resolution of 200 mA is required for a signal of 20 A, whereas a resolution of 20 A is required for a signal of 2000 A. Overall, the resulting dynamic range in this example is 800000 / 0.2=4000000, corresponding to 132DB or 22Bit. When the required scan rate is 8KHz, an AD converter with "true" 22Bit precision is not yet technically possible, and if it is available, it is currently very expensive. [0003] Other...

Claims

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Application Information

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IPC IPC(8): H03M1/12
CPCH03M1/188
Inventor 托马斯·德里霍恩哈拉尔德·京特于尔根·海贝尔
Owner SIEMENS AG
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