KR20020069692A - Taking apparatus for multi channel sampling data at the same time - Google Patents

Abstract

PURPOSE: A device for simultaneously obtaining multi-channel sampling data is provided to simplify the hardware structure for simplifying the debugging and having a relatively fast sampling frequency. CONSTITUTION: A device for simultaneously obtaining multi-channel sampling data includes a signal conditioner part(200) for converting a plurality of input channel signals to signals required for a system, an A/D converter(300) for converting the output signals from the signal conditioner part to digital signals according to an input conversion-beginning signal and outputting a conversion-finish signal as the conversion is finished, a logic part(400) for generating an interrupt signal as the conversion-finish signal is input from the A/D converter, and a processor(500) for stopping the output of the conversion-beginning signal with respect to the A/D converter and sequentially reading the conversion data input from the A/D converter if the interrupt signal is input from the logic part.

Description

Multi-channel Sampling Data Acquisition System {TAKING APPARATUS FOR MULTI CHANNEL SAMPLING DATA AT THE SAME TIME}

The present invention relates to an apparatus for acquiring sampling data, and more particularly, to an apparatus for simultaneously acquiring multichannel sampling data having a simple hardware configuration and a fast sampling period.

In general, a conventional multi-channel sampling data acquisition apparatus receives multiple channels and sequentially outputs them from the multiplexer to the A / D converters in the order of input channels, and converts the analog signals into digital signals and outputs them to the controller. Then, the controller acquires the sampling data by using the digital signal input from the A / D converter.

However, such a conventional multi-channel sampling data acquisition device has a problem that the sampling period is relatively slow because the multiplexer sequentially outputs the channels.

Therefore, an object of the present invention is to solve the above problems, and to simplify the hardware configuration to have a relatively fast sampling frequency while debugging is easy.

1 is a block diagram schematically showing the configuration of an apparatus for simultaneously acquiring multi-channel sampling data according to the present invention.

<Explanation of symbols for main parts of the drawings>

200: signal conditioner 210. 2n0: first to n signal conditioners

300: A / D converter section 211. 2n1: differential amplifier

212. 2n2: low pass filter 400: logic section

500: Processor

Features of the present invention for achieving the above object,

A signal conditioner unit which receives signals of a plurality of channels, converts them into signals required by the system, and outputs the signals;

An A / D converter unit converting the signal output from the signal conditioner unit into a digital signal according to the input conversion start signal and outputting the conversion end signal when the conversion is completed;

A logic unit which generates and outputs an interrupt signal when the conversion end signal is input from the A / D converter unit;

And a processor for stopping output of the conversion start signal to the A / D converter unit when the interrupt signal is input from the logic unit, and sequentially reading the conversion data input from the A / D converter unit. do.

The signal conditioner may include a differential amplifier for outputting a difference between an input + channel signal and a -channel signal, and a signal conditioner including a low pass filter for passing only signals of a predetermined band or less among the signals output from the differential amplifier. 1 to 1 is connected in correspondence.

Here, the A / D converter is connected to the plurality of A / D converters in correspondence with the signal conditioners 1: 1.

Hereinafter, a configuration of an apparatus for simultaneously acquiring multi-channel sampling data according to the present invention will be described in detail with reference to FIG. 1.

1 is a block diagram schematically illustrating a configuration of an apparatus for simultaneously acquiring multichannel sampling data according to the present invention.

Referring to FIG. 1, an apparatus 100 for simultaneously acquiring multichannel sampling data according to the present invention, a signal conditioner 200, an A / D converter 300, a logic 400, and a processor 500. It consists of.

The signal conditioner 200 receives the signals of the plurality of channels CH1 +, CH1-.CHn +, CHn- and converts them into signals required for the system, and outputs the first to nn signal conditioners 210... The channels CH1 +, CH1 -... CHn +, CHn- are connected in a 1: 1 correspondence. The first to nth signal conditioners 210 ... 2n0 are formed by the number of input channels, and each of the signal conditioners 210 ... 2n0 is an input + channel signal CH1 + ... CHn + and a -channel signal CH1- ... CHn-. Differential amplifiers 211... 2n1 for outputting the difference between the two amplifiers, and low pass filters 212... 2n2 for passing only signals of a predetermined band or less from the signals output from the differential amplifiers 211.

The A / D converter 300 converts a signal output from the first to n signal conditioners 210... 2n0 into a digital signal according to a conversion start signal input from the processor 500, and outputs the converted digital signal. The first to n A / D converters 310 to 3n0 are connected in a 1: 1 correspondence to the first to n signal conditioners 210... 2n0 so as to output an end signal.

The logic unit 400 generates and outputs an interrupt signal when a conversion end signal is input from the first to n A / D converters 310... 3n0 of the A / D converter unit 300. Here, the logic unit 400 is implemented with a gate array logic (GAL).

When the interrupt signal is input from the logic unit 400, the processor 500 stops outputting the conversion start signal to the A / D converter unit 300 and the first to n A / Ds of the A / D converter unit 300. The conversion data input from the converters 310 ... 3n0 are read sequentially. In this case, the processor 500 uses the DSP TMS320C40. Here, the processor 500 also outputs an A / D converter selection signal and a data read signal of the A / D converters 310 ... 3n0 to each of the A / D converters 310 ... 3n0.

Hereinafter, an operation of an apparatus for simultaneously acquiring multi-channel sampling data according to the present invention will be described in detail with reference to FIG. 1.

First, when the system is turned on, the processor simultaneously outputs a conversion start signal to the first to n A / D converters 310 ... 3n0 of the A / D converter unit 300.

On the other hand, when the channel CH1 +, CH1 -... CHn +, CHn- signals are input to the first to n signal conditioners 210 ... 2n0 of the signal conditioner 200, each of the first to n signal conditioners 210... Differential amplifiers 211... 2n1 output a difference of channel signals, and each low pass filter 212... 2n2 is a signal having a predetermined band or less among the difference signals of the sum of two signals output from each differential amplifier 211. Only the path is passed and output to the first to n A / D converters 310 ... 3n0 of the A / D converter unit 300.

Then, the first to n A / D converters 310 ... 3n0 of the A / D converter unit 300 are operated by the data read signal and the conversion start signal output from the processor 500, so that each low pass filter 212. The signal input from 2n2) is converted into a digital signal and output.

When the conversion of the digital signal is completed, the first to n A / D converters 310 ... 3n0 output the conversion end signal to the logic unit 400, and the logic unit 400 generates an interrupt signal to the processor 500. Output

The processor 500 stops the output of the data read signal and the conversion start signal to the A / D converter unit 300, and turns off the first to n A / D converters 310... 3n0 of the A / D converter unit 300. The A / D converter selection signal to be selected is output and the digital output signals output from the first to n A / D converters 310 ... 3n0 are sequentially read.

For example, in more detail, if there are 10 A / D converters, the processor outputs data read signals and conversion start signals to the 10 A / D converters, and data conversion of each A / D converter is completed. When the interrupt signal is output from the logic unit, the processor stops outputting the data read signal and the conversion start signal to 10 A / D converters, and outputs the digital output signal by outputting the A / D converter selection signal to the first A / D converter only. Read and check if it is the last channel, and if it is not the last channel, output the A / D converter selection signal only to the second A / D converter to read the digital output signal, and again, the third A / D converter and the fourth A / D converter. The digital output signal is read in order of the fifth A / D converter, the sixth A / D converter, the seventh A / D converter, the eighth A / D converter, the ninth A / D converter, and the tenth A / D converter.

Therefore, it has relatively fast sampling frequency, hardware configuration is simple, debugging is easy, processor interrupt processing burden is small, and program structure for A / D conversion and interrupt processing is simple.

The multi-channel sampling data acquisition device can be used for vector control of AC motors, acquisition of high-voltage three-phase signals for transmission line fault protection systems, tachometers using the Coriolis effect, and I and Q signal processing for satellite receivers.

As described above, according to the apparatus for simultaneously acquiring multi-channel sampling data according to the present invention, the hardware configuration can be simplified, so that debugging is easy and the sampling frequency can be relatively high.

Claims (3)

A signal conditioner unit which receives signals of a plurality of channels, converts them into signals required by the system, and outputs the signals; An A / D converter unit converting the signal output from the signal conditioner unit into a digital signal according to the input conversion start signal and outputting the conversion end signal when the conversion is completed; A logic unit which generates and outputs an interrupt signal when the conversion end signal is input from the A / D converter unit; And a processor for stopping output of the conversion start signal to the A / D converter unit when the interrupt signal is input from the logic unit, and sequentially reading the conversion data input from the A / D converter unit. Multi-channel sampling data acquisition at the same time. The method of claim 1, The signal conditioner unit, A signal conditioner comprising a differential amplifier for outputting a difference between an input + channel signal and a-channel signal, and a low pass filter for passing only signals of a predetermined band or less out of the signals output from the differential amplifier corresponding to 1: 1 for each channel Apparatus for acquiring multi-channel sampling data simultaneously, characterized in that connected. The method according to claim 1 or 2, The A / D converter unit, And a plurality of A / D converters are connected to the signal conditioners in correspondence with 1: 1.