KR200407586Y1 - Electrical Signal Converter Having LCD Display - Google Patents

Abstract

The present invention measures the current or voltage of the source to be measured and converts it into a DC current signal (4-20 mA current signal), which is a standard transmission signal for instrumentation, and displays the shape and value of the current or voltage component on the LCD display. By providing communication units (RS-232, RS-485), DC, AC and atypical waves can be reproduced without distortion to ensure excellent linearity even in phase or frequency changes and maintain complete isolation from the source under test. In addition, the present invention relates to an electrical signal converter having an LCD display which allows a user to check an operation state through a display device and to remotely control and transmit information. Electrical signal converter having an LCD display unit according to the present invention for achieving the above object, the current or voltage measuring unit for measuring and outputting the current or voltage of the source to be measured, and the signal output from the current or voltage measuring unit A converter for accumulating and performing True RMS to DC conversion; a current loop for converting the signal of the converter into a DC current signal, which is a standard transmission signal for instrumentation; and a signal for the current or voltage measurement unit and the converter. It is characterized by consisting of an LCD display to display.

Electrical signal converter, current, voltage, magnetic material, Hall element, feedback coil, amplifier, measurement lead, resistance, LCD display, communication unit

Description

Electrical Signal Converter Having LCD Display

1 is a block diagram showing the configuration of an electric signal converter having an LCD display according to the present invention.

2 is a perspective view showing the appearance of an electric signal converter with an LCD display according to the present invention.

3 is a perspective view illustrating an input / output unit of an electric signal converter having an LCD display unit according to the present invention.

4 is a structural diagram showing a current measuring unit of the electric signal converter with LCD display according to the present invention.

5 is a structural diagram illustrating a voltage measuring unit of an electric signal converter having an LCD display unit according to the present invention.

-Explanation of symbols for the main parts of the drawings-

1: electric signal converter with LCD display according to the present invention

10: MCU 20: current or voltage measurement unit

21: magnetic material 22: Hall element

23: amplifier 24: wire to be measured

25: resistance 26: coil

27 terminal portion 30 conversion portion

40: current loop portion 50: LCD display portion

51: operation unit 60: communication unit

70 relay unit 80 output unit and connection unit

90: mounting portion 00: feedback coil

The present invention relates to an electrical signal converter having an LCD display, and more particularly, to measure the current or voltage of the source to be measured and convert it into a DC current signal (4-20 mA current signal), which is a standard transmission signal for instrumentation, The shape and numerical value of the current or voltage component are displayed on the LCD display, and communication devices (RS-232, RS-485) are provided to reproduce direct current, alternating current and atypical waves without distortion, thereby changing phase or frequency. In addition to ensuring excellent linearity and maintaining complete insulation with the source to be measured, the present invention relates to an electrical signal converter with an LCD display that allows the user to check the operation status through the display device and to remotely control and transmit information.

In general, a conventional signal converter receives a signal measured using CT (rated current transformer), PT (measurement transformer), and shunt to measure current and voltage components. It performs DC (Direct Current) conversion function and outputs DC 4 ~ 20mA current signal.

However, the CT or PT exhibits a non-linear characteristic (generally known characteristic) in the phase and frequency change of current and voltage components by an electromagnetic induction method, and performs the function of converting the distorted measurement signal in a signal converter without filtering. In view of this, the relative error could not be avoided, and the shunt has a resistance change due to self-heating as an error and it is not insulated from the source to be measured. Therefore, the response and relative error amplification cannot be avoided in the process of making the insulation state in the signal converter. It had a downside.

In addition, the signal converter, which is an instrumentation instrument for instrumentation, has no device for displaying the operation status or has a function of expressing only a simple numerical value. It caused inconvenience.

Accordingly, the present invention is to solve the above problems, the object of the present invention is to reproduce the direct current, alternating current, and atypical wave without distortion in the method of measuring the current and voltage components, even in the phase change or frequency change By constructing 'internal or external current sensor' which can maintain the linearity and maintain complete isolation with the source to be measured, built-in or external type, and forming True RMS to DC conversion function of ΔΣ method and 4 ~ 20mA current loop It transmits current sensor measurement signal and conversion signal to LCD display, displays conversion signal through current loop, and remote control and information through RS-232, RS-485 communication function through MCU with LCD display. It is to provide an electric signal converter with an LCD display to enable transmission.

Electrical signal converter having an LCD display unit according to the present invention for achieving the above object, the current or voltage measuring unit for measuring and outputting the current or voltage of the source to be measured, and the signal output from the current or voltage measuring unit A converter for accumulating and performing True RMS to DC conversion; a current loop for converting the signal of the converter into a DC current signal, which is a standard transmission signal for instrumentation; and a signal for displaying the voltage measurement unit and the converter on the LCD. It is characterized by consisting of an LCD display.

Here, the LCD display may further include a communication unit such as RS-232 or RS-485 communication for remote control.

In addition, the current or voltage measuring unit, a high permeability magnetic material for magnetizing the electromagnetic field of the measured current or voltage component, a Hall element for measuring the magnetic force of the magnetic body and outputs the electrical displacement amount, the signal output from the Hall element It is preferable that the amplification unit is configured to maintain the state of the magnetic flux density '0' because the amplification of the reverse current flows through the feedback coil.

In addition, the current measuring unit may further include a terminal unit for connecting the measurement target wire, the current measuring unit is separated into the outside is preferably provided in an external type and further comprises a connection portion connected thereto.

The apparatus may further include a connection unit for outputting a 4-20 mA current signal through the current loop unit and connecting a supply power for the operation of the signal converter.

In addition, it is preferable to further include an operation unit having an external setting button for setting the LCD display.

The electrical signal converter device also includes a mounting portion having a mounting groove that can be mounted on a 3.5 cm DIN-rail and a fixing hole that can be directly attached to a wall.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

1 is a block diagram showing the configuration of an electrical signal converter with an LCD display according to the present invention, Figure 2 is a perspective view showing the appearance of an electrical signal converter with an LCD display according to the present invention, Figure 3 is the present invention 4 is a perspective view illustrating an input / output unit of an electric signal converter having an LCD display unit according to the present invention, and FIG. 4 is a structural diagram showing a current measuring unit of the electric signal converter having an LCD display unit according to the present invention, and FIG. 5 is an LCD display unit according to the present invention. As a structural diagram showing a voltage measuring unit of an electrical signal converter having a structure, it will be described together for convenience of description.

First, as shown in FIG. 1, the electrical signal converter 1 having an LCD display unit according to the present invention includes a current or voltage measuring unit 20 that measures and outputs a current or voltage of a source to be measured (not shown). , The converter 30 accumulatively sampling the signal output from the current or voltage measurement unit 20 to perform True RMS to DC conversion, and converting the signal from the converter 30 into a DC current signal that is a standard transmission signal for instrumentation. The current loop part 40 to convert, and the LCD display part 50 which displays the signal of the voltage measurement part 20 and the conversion part 30 on an LCD. Here, the MCU 10 performs a remote control of the LCD display unit 50 through the communication unit 60, a control role according to the setting of the LCD display unit 50, and the like of the electrical signal converter 1 according to the present invention. All functions are centrally controlled.

The current or voltage measuring unit 20 has a high permeability magnetic body 21 for magnetizing the electromagnetic field of the measured current or voltage component, and the Hall element 22 for measuring the magnetic force of the magnetic body 21 and outputting it as an electrical displacement amount. And an amplifying part 23 which amplifies the signal output from the Hall element 22 and flows a reverse current through a feedback coil (not shown), thereby maintaining a magnetic flux density of '0'.

As shown in Figures 4 and 5, the current measurement and the voltage measurement by the electric signal converter 1 with the LCD display according to the present invention is based on the same current measurement method. The current measuring method penetrates the measurement target wire 24 through the magnetic body endurance to measure the magnetization intensity of the magnetic body 21, and at the same time, the measured signal transmits the magnetic flux through a feedback coil (not shown) composed of a closed loop. Since the canceling reverse current flows in proportion to the current of the source under test, a closed loop zero flux current sensor having no structure of magnetic flux density is consequently constructed, and the measurement of voltage is the current measuring method. In order to configure the coil 26 for hundreds to thousands of times, the ratio of the current according to the size of the resistor 25 × N times (Turn) is equal to the amount of current equal to the measured current [(measured voltage ÷ resistance (25). )) × N] by allowing the magnetic material to fully magnetize and measuring the current to replace the result with the voltage component. This is due to the reason that the shape of the current passing through the resistor 25 is the same as that of the voltage. This method is for complete isolation from the source to be measured, and the method of measuring the magnetic strength of the magnetic material has the advantage of measuring regardless of the shape of the waveform such as DC and AC.

As shown in FIG. 4, the current measuring unit 20-1 has a built-in type when the measuring current is 50 [A] or less, and penetrates the current through the terminal unit 27 of FIG. 2. In the measurement current, in consideration of the magnitude of the current and the thickness of the conductor to be measured, the current measuring unit 20-1 as a current sensor is configured as an external device and connected to the electrical signal converter 1 through the connection unit 80 (see FIG. 3). It is composed.

As shown in FIG. 5, the voltage measuring unit 20-2 is connected to the polarity of the voltage through the terminal unit 27 (see FIG. 2), and the resistance 25 and the voltage sensor inside the electric signal converter 1 are connected to each other. By the voltage measuring unit 20-2 as a built-in type.

The output signal of the current measuring unit 20-1 or the voltage measuring unit 20-2 is shown as the same shape and proportional value as that of the measurement target (not shown), which is the conversion unit 30 and the LCD display unit 50. ), The LCD display unit 50 displays the shape, and the conversion unit 30 converts the True RMS to DC converted signal in the ΔΣ method. The ΔΣ True RMS to DC conversion function uses a known effective value-to-DC conversion program through a MCU or a calculation chip with a dedicated conversion function. The ΔΣ True RMS to DC conversion function is widely known. Detailed descriptions will be omitted.

As shown in FIG. 5, the LCD display unit 50 outputs the output signal measured from the current side of the current or voltage measuring unit 20 or the voltage measuring unit and the True RMS to DC converted signal converted by the conversion unit 30. The input signal is transmitted to the LCD display unit 50 through the MCU 10 and the output signal of the current or voltage measuring unit 20 is transferred to a graphic program that draws a waveform and displayed as a waveform. The measured value is displayed on the LCD display unit 50 together with the converted signal received from the conversion unit 30.

The MCU 10 controls ON / OFF the relay unit 70 by utilizing various setting functions and storage functions through a memory embedded therein, and the contact point is an input / output unit 80 (Fig. 3) to provide a connection, and to input / output the remote control signal by a communication port such as RS-232 or RS-485 of the communication unit 60. Of course, when the user uses the direct setting function in the electrical signal converter 1, the external setting button 51 can be utilized.

The current loop unit 40 converts the converted signal of the converter 30 into a DC 4-20 mA current signal, which is a standard transmission signal for instrumentation, and outputs it through the input / output unit 80 (see FIG. 3). Supply power is also received through the input / output unit 80.

In addition, the electrical signal converter 1 according to the present invention is provided with a mounting unit 90 is a structure that allows 35mm din rail attachment and wall mounting at the same time.

As described above, the electrical signal converter 1 having the LCD display unit 50 includes the MCU 10, which can be expanded to a variety of functions in the function of expressing, measuring, and transmitting a current / voltage signal. By applying energy measurement and various programs, self-diagnostics and failure prevention functions can be set up to extend and reproduce electrical signal converter functions.

As described above, according to the electric signal converter having the LCD display according to the present invention, the true RMS, which is a standard transmission signal for instrumentation, is measured by measuring the current or voltage of the source under measurement as a closed loop zero flux current sensor. -Conventional measurement by converting into a DC current signal (4-20 mA current signal) while displaying the shape and value of the current or voltage component through the LCD display unit and including communication devices (RS-232, RS-485) It overcomes the technical limitations of the technology (problems with CT, PT or SHUNT) and provides accurate measurement information to the user, while the user can display the current / current through the LCD display function of the signal converter installed in the field without carrying the measurement equipment. It is possible to check voltage phase, effective value, frequency, etc., and not only very efficient management, but also RS-232 and RS-485 communication functions can be monitored by the administrator without going to the field. There is an effect that it is possible to maximize the amount of time and administrative efficiency as possible.

Although the present invention has been described in detail with reference to the preferred embodiments according to the present invention, it is not intended to limit the present invention only to illustrate the present invention, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention. It should be noted that not only is this possible, but also this is within the scope of the present invention.

Claims (8)

A current or voltage measuring unit measuring and outputting a current or voltage of a source to be measured; A converter for accumulating and sampling the signal output from the current or voltage measurer to perform True RMS to DC conversion; A current loop unit for converting a signal of the conversion unit into a DC current signal which is a standard transmission signal for instrumentation; And an LCD display unit for displaying signals of the current or voltage measuring unit and the converting unit on the LCD. The method of claim 1, Electrical signal converter further comprises a communication unit for remote control via the LCD display. The method of claim 1, The current or voltage measuring unit, A high permeability magnetic material for magnetizing the electromagnetic field of the measured current or voltage component, Hall elements for measuring the magnetic force of the magnetic material and outputs the amount of electrical displacement; And an amplifier configured to amplify a signal output from the hall element and flow a reverse current through a feedback coil to maintain a magnetic flux density of '0'. The method of claim 1, The electrical signal converter further comprises a terminal unit for connecting the measurement lead of the current measuring unit. The method of claim 1, The current measuring unit is separated into the outside is installed external, the electrical signal converter, characterized in that it further comprises a connection connected to it. The method of claim 1, And a connection unit for outputting a 4-20 mA current signal through the current loop unit and connecting a supply power for the operation of the electric signal converter. The method of claim 1, And an operation unit having an external setting button for setting the LCD display unit. The method of claim 1, An electrical signal converter further comprising a mounting portion having a mounting groove for mounting on a 3.5 cm din-rail and a fixing hole for direct attachment to a wall.

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