KR100366192B1 - Apparatus and method for converting signal - Google Patents

Abstract

Industrial Applicability The present invention is a technology applied to a measurement control system. In particular, an industrial instrumentation control system is essentially applied to an instrumentation control system for amplifying, transmitting, removing noise, and converting signals from various sensors and detectors. It relates to a signal conversion device. More specifically, the present invention relates to a signal conversion apparatus and method that can be used in connection with any communication system and that can be automatically adjusted in response to an external environment. A digital type signal conversion apparatus according to the present invention includes an input / output condition specifying process for specifying a desired input / output condition through a key provided in the key input unit; Selecting an adjustment program corresponding to the specified input / output condition; Calculating an adjustment value of a corresponding condition based on the selected program and setting the adjustment value; Characterized in that the signal conversion method consisting of processing the input / output signal in accordance with each set adjustment value.

Description

Signal conversion device and method {APPARATUS AND METHOD FOR CONVERTING SIGNAL}

Industrial Applicability The present invention is a technology applied to a measurement control system. In particular, an industrial instrumentation control system is essentially applied to an instrumentation control system for amplifying, transmitting, removing noise, and converting signals from various sensors and detectors. It relates to a signal conversion device. More specifically, the present invention relates to a signal conversion apparatus and method that can be used in connection with any communication system and that can be automatically adjusted in response to an external environment.

In the control system used in each field of the industrial field, the signal converter is an essential device in the field that is responsible for amplifying, transmitting, and removing the signals of sensors, transmitters, and detectors that detect the control signals of each part. It also has major functions such as various function processing functions, signal isolation, and conversion to a clock suitable for the purpose.

The signal converters used in the related art are mostly analog types, which have a low waveform change and have low durability, precision, and reliability because they require periodic adjustment of the calibration point by volume. In addition, depending on the type of input and output, the user may need to set and order (or order) the specifications manually, and even if the specifications change, discard the purchase. The disadvantages of the conventional analog signal conversion apparatus are listed as follows.

1. The adjustment point changes with time after installation and needs to be recalibrated.

2. The temperature varies greatly depending on the surrounding temperature and needs to be adjusted.

3. According to the type of input and output, the user must specify the specifications.

4. Periodic calibration by standard equipment is required.

5. Signal input and output display is impossible.

6. The line analysis calculation is incorrect.

7. Function calculation is impossible.

8. There is no communication function.

9. No software noise canceling function.

Due to the shortcomings of the conventional analog type signal converters listed above, in the case of a system requiring a precise input signal, there is a limitation in using an analog type signal converter, and it is difficult to accumulate and analyze data.

In addition, most of the control devices are in the trend of emphasizing the communication function with the upper computer, the conventional analog type signal conversion device is not equipped with the communication function, it is difficult to link with other systems, and the calibration must be relyed on manual operation. It became the cause of the reliability decline.

Accordingly, an object of the present invention is to provide a signal conversion device and method for solving the problems of the conventional analog signal conversion device.

Another object of the present invention is to provide a signal converting apparatus and method which can be used in connection with any communication system and which can be automatically adjusted corresponding to an external environment.

It is still another object of the present invention to employ a microprocessor capable of digitally implementing a signal conversion apparatus, and to select a program within an input according to any input and output conditions. The present invention provides a conversion device and method.

In order to achieve the above object, the signal conversion device according to the present invention includes: a power supply unit for converting and supplying AC or DC power to power required therein; An input unit connected to an interlocked system, the input unit converting an analog signal input from the system into a digital signal; An output unit connected to the system and outputting an output signal converted into analog according to an adjustment value of an input signal to the system; A key input unit having a key for designating the input and output conditions and generating a corresponding key signal when a specific key is pressed; A program corresponding to a specified input / output condition is selected based on a key signal of an input / output condition designation generated by the key input unit, and the adjustment value is calculated and stored by performing filtering and averaging of the input signal based on the corresponding program. And a controller for processing an input / output signal according to the calculated adjustment value; And a bus providing a communication path between the components.

A signal conversion method using the same includes: an input / output condition specifying process of designating a desired input / output condition through a key provided in the key input unit; Selecting an adjustment program corresponding to the specified input / output condition; Calculating an adjustment value of a corresponding condition based on the selected program and setting the adjustment value; The input / output signal is processed according to each set adjustment value.

1 is a block diagram of a signal conversion apparatus according to an embodiment of the present invention;

2 is a detailed configuration diagram of an input unit of FIG. 1;

3 is a detailed configuration diagram of the output unit of FIG. 1;

4 is a flowchart illustrating a signal conversion process corresponding to an external environment applied to the present invention;

5 is a step-by-step process flow diagram of a signal conversion apparatus according to an embodiment of the present invention;

6 is a flowchart of an analog-digital conversion process of an input unit according to the present invention;

7 is a control flow diagram for processing an adjustment operation of the control unit according to the present invention;

8 is a detailed operation control flow chart for 600 of FIG.

9 is a detailed operation control flow chart for 700 of FIG.

10 is a flowchart of a digital-analog conversion process of an output unit according to the present invention.

(Explanation of symbols for the main parts of the drawing)

10: control unit 20: power supply unit

30: bus 40: input unit

50: output unit 60: key input unit

70: display unit

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as much as possible even if they are displayed on different drawings. In addition, in the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention, such as specific processing flows. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Detailed descriptions of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

1 is an internal block diagram of a signal conversion apparatus according to an embodiment of the present invention, which includes a control unit 10, a power supply unit 20, a bus 30, an input unit 40, an output unit 50, and a key input unit 60. ) And the display unit 70.

The power supply unit 20 converts AC or DC power into power required therein and supplies the same. For example, the power supply unit 20 converts DC 24V or AC 220V into ± 5V and 12V internal power to supply the necessary power to each component through the power supply bus 30.

The input unit 40 and the output unit 50 are connected by a main line to a system requiring a signal (a system configured with a sensor, a transmitter, a detector for detecting a control signal of each part, and a communication system such as wireless communication). .

The input unit 40 converts an analog signal input from a signal input destination connected to the system such as a sensor, a transmitter, a detector, and then converts the analog signal into a digital signal.

The output unit 50 converts and amplifies the digital signal processed by the control unit into an analog and outputs the output signal to the system.

The key input unit 60 has a key for designating the input and output conditions, and when a specific key is pressed, a corresponding key signal is generated and applied to the controller 10.

The bus 30 provides a communication path between the internal components.

The display unit 70 displays the analog-to-digital conversion measurement value of the input signal received from the input unit 40 and the digital-to-analog conversion output value output to the output unit 50, and under the control of the control unit 10. Displays various situations of the signal conversion device.

The controller 10 is implemented with, for example, a microprocessor. The microprocessor includes a switch that is responsible for switching between a CPU, RAM, ROM, ZERO, Span, and RESET. The controller 10, which may be implemented as such a microprocessor, corresponds to an input / output condition specified based on a key signal of input / output condition designation (zero adjustment, span adjustment and reset, etc.) generated by the key input unit 60. Selecting a program to perform, filtering and averaging the input signal based on the program to calculate and store the adjustment value, and processes the input / output signal according to the calculated adjustment value.

FIG. 2 is a detailed configuration diagram of the input unit 40 of FIG. 1. The input unit 40 includes an amplifying unit (OP-AMP) 42 for amplifying an input signal, and converts an input analog signal into a digital signal. An analog-to-digital converter (ADC) 41.

3 is a detailed configuration diagram of the output unit 50 of FIG. 1, wherein the output unit 50 converts an output value adjusted according to the adjustment value calculated by the control unit 10 into an analog signal. (DAC) 51 and an amplifier (OP-AMP) 52 for amplifying and outputting the output signal converted into the analog signal to the system.

Hereinafter, a signal conversion operation corresponding to an external environment based on the configuration of the signal conversion apparatus of FIGS. 1 to 3 will be described in detail with reference to the flowcharts of FIGS. 4 to 10.

First, FIG. 4 is a flowchart illustrating a signal conversion process corresponding to an external environment applied to the present invention. The signal conversion process is an input / output condition designation step 401, and an adjustment program selection step 402 corresponding to a specified condition. ), An adjustment value calculation step 403, and an input / output signal processing step 404 according to the calculated adjustment value. That is, in step 401 of the signal conversion process corresponding to the external environment, a user specifies an input / output condition by operating the key input unit 60. In operation 402, the controller 10 selects an adjustment program corresponding to an input / output condition input through the key input unit 60. The controller 10 has a plurality of programs therein for each input / output condition. In step 403, an adjustment value is calculated based on the selected program. In step 404, the input / output signal is processed according to the calculated adjustment value. The input / output signal processing is an output value adjustment by calculating an offset value in the case of zero adjustment, and an output value adjustment by calculating a slope value in the case of span adjustment. This will be described in detail in the description of FIGS. 6 to 9 described below.

FIG. 5 is a step-by-step process flow diagram of a signal conversion apparatus according to an exemplary embodiment of the present invention. When the main driving of the signal conversion apparatus starts in step 500, the signal input through the input unit 40 is analog-digital in step 510. (A / D) Performs signal conversion operation. Thereafter, in step 520, the controller 10 processes the adjustment (zero and span adjustment) according to input / output condition designation. In step 530, the adjusted signal is converted into a digital-analog (D / A) signal through the output unit 50 and outputs the converted signal.

A detailed operation of step 510 is shown in FIG. 6, a detailed operation of step 520 is shown in FIGS. 7 to 9, and a detailed operation of step 530 is shown in FIG. 10.

6 is an analog-to-digital conversion processing flowchart of the input unit 40 according to the present invention. When the analog-digital conversion operation of the input unit 40 is started in step 511, the input unit 40 is inputted in step 512. At this time, the control unit 10 measures the analog-to-digital conversion (ADC) measurement value by performing filtering and averaging on the analog-to-digital conversion input signal. In operation 513, the controller 10 controls the display unit 70 to display the analog-to-digital conversion measurement value on the display unit 70. At this time, the measured ADC value is converted to a HEX code or DECIMAL code and displayed on the display unit 70.

In addition, for each input signal, steps 512 and 513 are performed through step 514 of return.

7 is a control flow diagram for processing the adjustment operation of the controller 10 according to the present invention,

In step 521, the controller 10 checks whether there is a key input through the key input unit 60. If there is a key input, the process proceeds to step 522. If it is determined whether the input key signal is a zero adjustment key, the process proceeds to step 523 if the input key signal is a zero adjustment key, and otherwise proceeds to step 525. In step 523, the controller 10 selects a program corresponding to zero adjustment to calculate a zero offset. In step 524, the controller 10 stores the zero offset in a designated storage area, for example, an EEPROM. If the key signal input in step 522 is not the zero adjustment key, the controller proceeds to step 525 to check whether the span adjustment key is applied. If the input key signal is a span adjustment key, the controller proceeds to step 526, otherwise proceeds to step 528. Performs a function corresponding to the input key signal. The function performed in step 528 may be, for example, a reset. After the span adjustment key is pressed, the control unit 10 proceeds to step 526 to calculate a span slope by selecting a program corresponding to the span adjustment, and then, in step 527, the control unit 10 calculates the span slope calculation value to a designated storage area, for example, an EEPROM. Store in

When the zero adjustment, span adjustment, and reset operation according to this one key operation is completed, the controller returns to wait for the next key signal. In FIG. 7, operations 523 and 524 (zero adjustment process according to the zero adjustment program) are referred to by reference numeral 600 and the detailed operation is illustrated in FIG. 8, and steps 526 and 527 (span according to the span adjustment program). The detailed operation of FIG. 9 is illustrated by reference numeral 700.

FIG. 8 is a detailed operation control flowchart of 600 of FIG. 7. In step 601, the controller 10 receives a zero voltage (0.0 V). If the zero adjustment key is input through the key input unit 60 in step 602, the process proceeds to step 603. Otherwise, the zero adjustment process ends. In step 603, the control unit 10 calculates a zero offset based on a program, where the equation for calculating the offset is as shown in Equation 1 below.

Offset = output value at zero voltage input-zero voltage input value (0.0)

The offset is averaged by the Nth sampling. The offset calculation value obtained by averaging the sample after the Nth sampling by Equation 1 is stored in the storage area, for example, EEPROM, by the controller 10 in step 604. Thereafter, the controller 10 determines an output in step 605, and the output is a value obtained by subtracting the offset calculation value from an input value.

FIG. 9 is a detailed operation control flowchart of 70 of FIG. 7, and in step 701, the controller 10 receives a maximum range value. In step 702, when the span adjustment key is generated through the key input unit 60, the control unit 10 proceeds to steps 703 and 704 to calculate the input voltage Vin and the slope calculated by the span adjustment program. It sets based on Formula 2 and Formula 3.

Vin = Maximum Range Input-Offset

Slop = Vout / Vin

The slope is averaged by the Nth sampling. The slope calculation value obtained by averaging the samples after the Nth sampling by Equation 2 and Equation 3 is stored in the storage area, for example, EEPROM, in step 705 by the controller 10. In operation 706, the controller 10 determines an output. The output of the controller 10 is a value obtained by multiplying the slope calculated value by an input voltage Vin.

10 is a flowchart of a digital-to-analog conversion process of an output unit according to the present invention. When the DAC operation of the output unit 50 is performed, in step 532, the controller 10 is configured to control the input signal input through the input unit 40. Apply the zero adjustment set in the input value. The result of the zero adjustment at this time is "input value + zero offset".

In addition, in step 533, the controller 10 applies the span adjustment set to the zero adjusted input value. The result of the span adjustment at this time is "(ADC input-offset) * slope calculation value".

In step 534, the controller 10 outputs the zero- and span-adjusted adjustment values through the output unit 50 through digital-to-analog conversion (DAC), and then controls the display unit 70 in step 535. Display the DAC output value.

On the other hand, the detailed description of the present invention has been described with reference to specific embodiments, of course, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention can be used in conjunction with any communication system, and there is an advantage in that it is possible to implement a signal conversion device capable of automatic adjustment corresponding to an external environment.

Another effect of the present invention is to employ a microprocessor capable of digitally implementing a signal conversion device, the advantage of being able to properly perform the required signal conversion only by selecting the program inside, given any input and output conditions There is this.

Another effect of the present invention is that it can be applied to a system requiring a precise input signal because it can be applied to a product that requires high precision, the digital type has the advantage of easy data accumulation and analysis, and control the signal line one by one By connecting the signal lines by connecting to the communication lines of the system without wiring to the control room, there is an advantage of reducing the wiring cost and improving reliability.

Another effect of the present invention has the advantage of being competitive in terms of quality and price.

Claims (9)

In the signal conversion device, A power supply unit converting an AC or DC power supply into an internally required power supply; An input unit connected to an interlocked system, and converting an analog signal input from the system into a digital signal; An output unit connected to the interworking system and outputting an output signal converted into analog according to an adjustment value of an input signal to the system; A key input unit having a key for designating the input and output conditions and generating a corresponding key signal when a specific key is pressed; A program corresponding to a specified input / output condition is selected based on a key signal of an input / output condition designation generated by the key input unit, and the adjustment value is calculated and stored by performing filtering and averaging of the input signal based on the corresponding program. And a controller for processing an input / output signal according to the calculated adjustment value; And And a bus providing a communication path between the components. The method of claim 1, wherein the control unit; Signal converting device, characterized in that implemented by a microprocessor. The method of claim 2, wherein the input unit; An amplifier for amplifying the input analog signal, And an analog-to-digital converter for converting the amplified analog signal into a digital signal. According to claim 3, The output unit; A digital-analog converter for converting an output value adjusted according to the adjustment value calculated by the controller into an analog signal; And an amplifier for amplifying the output signal converted into the analog signal and outputting the amplified signal to the interlocking system. The method according to claim 1 or 4, And a display unit for displaying the analog-to-digital conversion measurement value of the input signal received from the input unit and the digital-analog conversion output value output to the output unit, and displaying various situations of the signal conversion apparatus under the control of the controller. Signal conversion device characterized in that. An input unit connected to an interlocking system and converting an analog signal input from the interlocking system into a digital signal; An output unit connected to the interlocking system and outputting an output signal converted into analog according to an adjustment value of an input signal to the interlocking system; A key input unit having a key for designating the input and output conditions; A display unit; Built-in various programs corresponding to the input / output condition, select the corresponding program corresponding to the specific input / output condition, calculate and store the adjustment value according to the input / output condition based on the program, and then calculate the calculated adjustment value A controller for processing an input / output signal according to the present invention; And a bus providing a communication path between the respective components. Designating a desired input / output condition through a key provided in the key input unit; Selecting an adjustment program corresponding to the specified input / output condition; Calculating an adjustment value of a corresponding condition based on the selected program and setting the adjustment value; And a process of processing an input / output signal according to each set adjustment value. The method of claim 6, wherein the adjusting value calculation process; A zero adjustment step of setting a zero offset obtained by subtracting the zero voltage input value to an output value at zero voltage input to a value obtained by averaging by N samplings, and setting the output value to an input value subtracted from the offset calculation value; And The span that divides the input voltage obtained by subtracting the offset from the maximum range input value to the output voltage is set to the value obtained by averaging N samplings, and the output value is set to the value obtained by multiplying the slope calculated value by the input voltage. Signal conversion method characterized in that the adjustment step. The method of claim 7, wherein the input / output signal processing step; An analog-digital conversion step of converting the input analog signal into a digital signal; Applying a zero adjustment to add a zero offset to an input value of the input signal, Applying a span adjustment to the zero adjusted result value to multiply the offset value by the input value back to a slope value; And outputting an output signal obtained by digitally-analog converting the zero and span adjusted values. The method according to claim 6 or 8, And displaying the analog-digital conversion input value and the digital-analog conversion output value on the display unit.