KR100210658B1 - Electronics apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device capable of measuring an accurate gas amount by measuring a pressure and temperature of a gas and compensating for a gas volume. Conventionally, when a pulse input check is processed in hardware like a flow pulse generator, noise, There is a problem that the error of the pulse check is easy to be affected by the impulse, and when the power is supplied below the driving voltage to the device such as the analog / digital converter, an error occurs in the calculation of the correction volume, and the temperature and pressure value through the sensor It is very inefficient in terms of power consumption because it continuously reads and performs analog / digital conversion and displays various data including the calculated correction volume value on the LCD.

Therefore, in the present invention, when a pulse input is checked in the gas volume compensator, the hardware is accepted by the software to prevent the malfunction due to noise or the like, thereby preventing the input due to the malfunction, and driving supplied to each element. With the data list that converted the voltage into the analog / digital conversion value in advance, the voltage actually entered into the small intestine is checked and displayed on the display, where the actual pulse value, temperature, and pressure value are displayed as physical quantities through analog / digital conversion. In addition to knowing the authenticity of the value, the microprocessor is separated into the main and sub-peakers, and then the current consumption is minimized by supplying a driving voltage to the sub-seeker only when the main see- ing has a key input or at a set time. .

Description

Electronics

1 is a block diagram of a conventional electronic device.

FIG. 2 is a circuit diagram of the volume compensator in FIG.

3 is a schematic diagram of a pulse generator in FIG.

4 is a block diagram of an electronic device of the present invention.

5 is a circuit diagram of the gas volume compensator in FIG.

6 is a circuit diagram of the check unit in FIG.

7 is a flowchart of operation of the main CPI in FIG.

FIG. 8 is an explanatory diagram showing an operation process in which a driving voltage is supplied from the power supply unit of FIG.

9 is a flow chart of the operation of the sub-CPI in FIG.

* Explanation of symbols for main parts of the drawings

10 gas meter 20 pressure sensor

30: temperature sensor 40: flow pulse generator

50: gas volume compensator 50a: key input unit

50b: pulse input unit 50c: microprocessor

50c1: Main CPI 50c2: Sub CPI

50g: power supply 50j: analog / digital converter

60: computer

The present invention is to compensate for the uncalibrated volume of a gas meter that generates a continuous analog flow pulse proportional to the amount of gas flowing mechanically, and in particular, by measuring the pressure and temperature of the gas to compensate for the gas volume, The present invention relates to an electronic device capable of measuring.

The configuration of a conventional electronic device includes a flow pulse generator connected to the gas meter, as shown in FIG. 1, for generating a continuous analog flow pulse proportional to the amount of gas flowing mechanically into the gas meter; A pressure sensor exposed to the gas, the pressure sensor coupled to the gas meter and measuring a gas pressure proportional to the analog flow pulse and generating an analog signal proportional to the value; A temperature sensor exposed to the gas and connected to the gas meter and measuring a gas temperature proportional to the flow pulse and generating an analog signal proportional to the value; An analog flow pulse received through the pulse generator is composed of a volume compensator for correcting the volume of the gas meter uncompensated for the pressure and temperature by the pressure sensor and the temperature sensor.

The circuit compensator of the volume compensator includes, as shown in FIG. 2, pressure measuring means for receiving an analog signal transmitted through a pressure sensor exposed to a gas of a gas meter and measuring a pressure of the gas; Temperature measuring means for measuring the temperature of the gas by receiving an analog signal transmitted through the temperature sensor exposed to the gas of the gas meter, and a flow pulse proportional to the uncalibrated volume of the gas meter receives the pulse according to the time Time control means for outputting; An analog / digital conversion means for generating a continuous digital output in which the analog signal is proportionally converted into a digital value according to the pressure and temperature conditions transmitted from the pressure and temperature measurement means; And a correction control means for correcting the uncorrected volume pulse transmitted through the time control means based on the digital pulse transmitted through the analog / digital conversion means and displaying the corrected volume pulse on the display means. .

Referring to the prior art configured in this way in detail as follows.

When a gas flowing mechanically enters the gas meter 1, the pressure sensor 2 connected to the gas meter 1 and exposed to the gas measures the pressure of the gas and outputs an analog signal proportional to the measured value. Output to the volume compensator (5).

Like the pressure sensor 2, the temperature sensor 3 connected to the gas meter 1 and exposed to the gas measures the temperature of the gas and outputs an analog signal proportional to the measured value. Will output

At this time, the flow rate pulse generator 4 measures the flow rate pulse (gas amount) corresponding to the uncalibrated volume of the gas meter 1 and outputs it to the volume compensator 5.

Then, the volume compensator 5 receives the gas pressure sensed by the pressure sensor 2 and the gas temperature sensed by the temperature sensor 3 and the flow rate pulse generated by the flow rate pulse generator 4, that is, the amount of gas. To correct the uncorrected volume of the meter 1, the operation of the compensator 5 will be described with reference to FIG.

In the pressure measuring unit 5a, the pressure of the gas delivered from the pressure sensor 2 is changed into an analog signal proportional thereto, and in the temperature measuring unit 5b, the temperature value of the gas delivered from the temperature sensor 3 is proportional thereto. The signal is converted into an analog signal and transmitted to the analog / digital converter 5b.

At this time, when a flow pulse corresponding to the uncalibrated volume of the gas meter 1 is generated from the flow pulse generator 4 to the time control unit 5c, the time control unit 5c is set according to time with respect to the input flow pulse. The pulses are output to the analog / digital converter 5b and the correction controller 5e, respectively.

Then, the analog / digital converter 5b proportionally converts the flow rate pulse input from the time controller 5c according to the pressure and temperature conditions transmitted from the pressure measuring unit 5a and the temperature measuring unit 5b. When the continuous digital value is output to the correction controller 5e, the correction controller 5e uses the data value input from the analog / digital converter 5b to output the pulse inputted from the time controller 5c. The volume of (1) is corrected, and the corrected volume pulse is displayed on the LCD display unit 5f.

In the above, the flow rate pulse (gas amount) is a flow rate based on 013 ° C and 1013.25 mBar as the actual flow rate (hereinafter referred to as uncorrected value), but the gas amount is mechanically detected by the gas meter 1, but the temperature and pressure This is an uncorrected value with no effect.

However, an error of 0.366% occurs when the temperature changes by 1 ° C, and an error of 0.987% occurs when the pressure changes by 10 mBar.

Therefore, to compensate for this, a volume compensator 5 is required, and the volume compensator 5 performs volume compensation by checking an uncorrected pulse (gas amount), pressure, and temperature. .

The actual flow rate calculation is calculated by the following equation by the law of BOYLE-GUY LUSSA.

Va: Fine adjustment (pulse value)

Pb: Reference pressure (1013.25mBar) Po: Measuring pressure

T: Reference temperature (273.15K) To: Measurement temperature

K: Compression rate constant of gas (gas compression rate / standard compression rate)

As described above, by measuring the pressure and temperature of the gas flowing into the gas meter 1 to compensate for the gas volume, an accurate amount of gas is measured.

Referring to FIG. 3 for the operation of the device for driving the flow pulse generator 4, when the gear / shaft assembly 7 is configured as the circular orbit of the pin 6, the mechanical display of the uncompensated volume is performed. It is used to drive a counter or to run a pulse generator.

The flow pulse generator 4 includes an orbital magnet 8 and is operated by the rotational force of the assembly and is exposed to a fixed lead switch that is laterally exposed from there and then shifted back to its open position.

Each track of the track magnet 8 instantaneously closes the reed switch to generate a continuous pulse (UVF) expressed in an uncompensated volume, and after a little time, a series of analog signals proportional to the uncorrected volume is generated.

In detail, the relationship between the gas meter 1 and other parts of the gas meter 1 and the pressure sensor 2 and the temperature sensor 3 are exposed to the flowing gas, respectively, located downstream and upstream of the gas meter 1. have.

When the pressure sensor 2 senses the pressure of the gas and delivers the pressure to the pressure measuring unit 5a, the pressure sensor 2 is measured and calculated by the pressure measuring unit 5a and input to the analog / digital converting unit 5b. Outputs an analog signal proportional to the normal input inside and the absolute pressure of the gas.

Because compression rate is 0 This is because the pressure value in the 250 psic range is linearized and can be approached with good results.

Measurements are made so that the compression rate constant is an analog signal, which can easily be obtained from a useful table of the pressure range of the analog / digital converter 5b.

The measurement of the temperature sensor 3 is similar to that of the pressure sensor 2, but the temperature sensor 3 outputs an analog signal proportional to the standard input in the operating range and the absolute temperature of the gas.

However, in the prior art operating as described above, if the pulse input check is processed in hardware like a flow pulse generator, there is a problem that an error occurs in the pulse check due to noise, that is, an instantaneous impulse, and an analog / digital converter. If power is supplied below the driving voltage to the device such as error, correction volume calculation error occurs, continuous reading of temperature and pressure value through sensor, analog / digital conversion, and calculated correction volume value Since data must be displayed on the LCD, there is a very inefficient problem in terms of power consumption.

Accordingly, an object of the present invention for solving the conventional problems is to accept the hardware input when checking the pulse input in the gas volume compensator, and to process the malfunction caused by the noise by software to prevent the input due to the malfunction. It is to provide an electronic device to prevent.

Another object of the present invention is to display the actual pulse value, temperature, pressure value by checking the voltage actually input to the device with a data list in which the driving voltage supplied to each device is converted into an analog / digital conversion value in advance. The present invention provides an electronic device that allows an electronic device to know the authenticity of a value expressed as a physical quantity through analog / digital conversion.

Another object of the present invention is to separate the microprocessor into a main C and a sub C oil, and to supply a driving voltage to the sub C oil only when there is a key input or at a predetermined time. In providing a device.

An apparatus arrangement of the present invention for achieving the above object comprises: a flow pulse generator coupled to the gas meter for generating a continuous analog flow pulse proportional to the amount of gas flowing mechanically into the gas meter; A pressure sensor coupled to the gas meter that is exposed to a gas to measure the pressure of the gas and generate an analog signal proportional to the value; A temperature sensor coupled to the gas meter that is exposed to a gas to measure the temperature of the gas and generate an analog signal proportional to the value; A gas volume compensator for compensating software flow pulses inputted from the flow pulse generator according to pressures and temperature conditions received from pressure and temperature sensors; The gas volume compensator communicates with the gas volume compensator during volume compensation of the gas meter to display a corrected value on the terminal screen or to display the data through a printer.

The circuit configuration of the gas volume compensator includes, as shown in FIG. 5, key input means capable of inputting a key signal so that a customer can view desired data; Pulse input means for receiving an input flow pulse; A microprocessor for controlling peripheral devices by a key signal input through the key input means; Serial communication means for performing communication with a computer to transmit and receive necessary data; Ipyrom which stores data that should not be lost when the battery is discharged or when the equipment itself loses its function; An adjustment switch, which is a kind of locking device for controlling an important parameter value and a possibility of calibration change, and a power supply means for supplying power to the microprocessor and necessary parts; LCD display means for displaying a variety of information on the screen by the control of the microprocessor; Check means for checking the pressure and temperature of the gas flowing into the gas meter and checking whether the voltage supplied to the microprocessor is a reference voltage; Analog / digital conversion means for converting data transmitted through the check means into a digital value which is a physical quantity and providing the same to the microprocessor; It consists of RAM that stores the cumulative uncompensated volume value / compensated value, average temperature / pressure value, and in case of abnormal condition the uncompensated volume / compensated volume value.

In addition, as shown in FIG. 6, the check means includes a temperature sensor that receives a constant current as an input and outputs a change in temperature as a change in resistance, and converts a constant current value through the temperature sensor into a change in voltage. Current / voltage converting means; A pressure sensor that receives a constant voltage as an input and outputs a change in pressure as an amount of change in voltage, and a sample / holder means for separating different inputs input through the current / voltage converting means and the pressure sensor and applying it to an output terminal; ; Temperature and pressure voltage amplifying means for amplifying the input separated through the sample / holder means to a predetermined level, respectively; An analog multiplexer selects only one of the voltages amplified by the amplifying means and applies it to the output terminal.

Referring to the operation and effect of the present invention configured as described in detail as follows.

When the gas enters the gas meter 10, the pressure sensor 20 and the temperature sensor 30 connected to the gas meter 10 and exposed to the gas measure the current pressure and temperature of the gas, respectively. An analog signal proportional to the measured pressure and temperature is output to the gas volume compensator 50.

At this time, the flow rate pulse generator 40 outputs an analog flow rate pulse, that is, an uncorrected value, of the gas flowing into the gas meter 10 to the gas volume compensator 50.

Then, as shown in FIG. 6, the check unit 50i in the gas volume compensator 50 first receives a constant current as the temperature sensor 30, and changes the temperature as an amount of resistance to change the current / When outputting to the voltage converter 50i1, the current / voltage converter 50i1 detects the amount of change in voltage by applying a constant current value and a variable resistance value to Ohm's law and outputs it to the sample / holder 50i2. do.

The pressure sensor 20 receives a constant voltage as an input, and outputs the change in pressure as the change amount of the voltage to the sample / holder 50i2.

Accordingly, the sample / holder 50i2 separates different inputs received from the current / voltage converter 50i1 and the pressure sensor 20 to the pressure voltage amplifier 50i4 and the temperature voltage amplifier 50i3. When outputting, the temperature voltage amplifier 50i3 and the pressure voltage amplifier 50i4 are amplified and output at a constant level.

The analog multiplexer 50i5, in which each voltage value amplified by the amplifiers 50i3 and 50i4 selects and outputs only one input value of the input signal, does not explain the control signal of the sub-cif oil in the gas volume compensator 50, which is not described. Outputs the signal selected by the analog / digital converter 50j.

Then, the analog / digital converter 50j converts the digital / digital converter 50 into a digital value under the control of the microprocessor 50c based on the reference voltage generated from the reference voltage generator 50i6 and outputs the digital value to the gas volume compensator 50.

The sub C oil 50c2 of the gas volume compensator 50 shown in FIG. 5, which has received the digital value converted from the analog / digital conversion unit 50j, operates to compensate for the uncorrected gas volume, and various Data is displayed and stored, and the operation of the sub CPI 50c2 is controlled by a key input through the key input unit 500a or a predetermined time (set to 20 seconds in the present invention) in the main CPI 50c1. do.

Then, referring to FIG. 7 for the operation of the main CPI 50c1, first, when the power is supplied from the power supply unit 50g, the data line to send and receive data, the address line to find the address of the data, and various control signals are controlled. Defining the input and output ports, and also defines the initial value of the port, and cuts off the power supplied to the sub C (50c2) once to reduce the current consumption (S1).

Then, in order to save the previously stored values to store the key input unit and the pulse input unit input through the key input unit 50a and the pulse input unit 50b, the data stored in the RAM 50k is erased, and the initial value is not stored. Put the value (S2).

In order to check whether the flow rate pulse of the gas meter 10 is input, the number of pulses input through the pulse input unit 50b is checked (S3), and the checked pulse number is stored in the RAM 50k, and then RTC (Real Time Clock) Set the definition and check time (here 20 seconds) (S4).

When the RTC (Real Time Clock) defined above is activated, the main CPI (50c1) performs 20 second counting. When the counted value reaches 20 seconds, the sub CPI (50c2) is turned on, and the sub CPI A communication operation is performed at 50c2 to transmit pulse data values, RTC data values, interrupts, and the like (S5).

If it is less than 20 seconds or after the completion of the communication operation, it checks whether there is a key input, and if there is a key input, stores the value in the RAM 50k and passes the key data value when communicating with the sub CPI 50c2 ( S6).

As a result, the main CPI 50c1 turns on the sub CPI 50c2 every 20 seconds and whenever there is a key input, thereby minimizing power consumption. It also prevents current consumption because it does not turn on the LCD power (50h).

In addition, the power supply unit 50g for supplying power to each unit required in FIG. 5 includes four power sources (+ 7.2V, + 3.6V, LCD (+), LCD () as shown in FIG. -)), As in (b), + 3.6V is supplied to the main CPU (50c1) to make a signal of 3VPC to make a signal of 3VCC via the transistor (Q1) of the power supply (50g).

This signal is supplied to the power source of various digital devices like + 3.6V, and especially to the sub CPI (50c2) to make various control signals (5VPC, communication power, LCD power) as in (c). Serve

The two control signals generated by the sub C oil 50c2 are respectively driven through the transistor Q2 and the MOS transistor Q3 and supplied to the analog circuit through the voltage regulators RE1, RE2, RE3, and RE4. In addition, it generates power (+ 5VAC, + 5VDC) and also LCD _- V, the driving power of LCD, and 232 _- VCC, the driving power of communication device.

Here, the reason for supplying the (+) power and the (-) power to the LCD is that the temperature range in which the present invention is used is -20 ° C. It should be + 60 ℃ because the driving condition of the LCD that satisfies this temperature condition must be supplied with (+) power (+ 5V) and (-) power (-3V).

As described above, the power control is performed through several steps to reduce the current consumption to the maximum. That is, the main CPI 50c1 using +3.6 V as a driving power supply controls the transistor Q1 on / off with a 3PVC signal, except for the case where necessary (key input and service at 20 second intervals). By turning off the driving power of), it maximizes the driving period of using the DC power by using the DC power with the minimum current.

In addition, referring to FIG. 9, the operation of the sub C oil 50c2 is received. When the power and the reset signal RESET are received from the main C oil 50c1, the sub C oil 50c2 is in a state in which power is supplied. Start a unique day.

That is, when the sub CPI 50c2 is supplied with power, after checking the CALIBRATION switch, if the switch is in the ON state, the temperature and pressure is carved out (S11).

TEMP is temperature and AD is analogue / digital conversion value

X is the slope, Y is the offset value

If you define three points for reverse and temperature, and define the X and Y values as HIGH, MIDUM, and LOW, you can use the high-medium-medium-low relationship. same.

Of these three, we find X and Y in (2) and (3),

Also, if we find X and Y in (3) and (4),

Where you choose X and Y values in (1) and X, Y in (5) and (6), or X and Y in (5 ') and (6'). The standard of is based on the analog / digital value in the middle of the set temperature range.If the analog / digital value of the input temperature is larger than the standard value, select X and Y in (5) and (6). If it is small, it is transmitted to the computer 60 through the serial communication unit 50d so as to select X and Y of the formulas (5 ') and (6'), so that the computer 60 processes the software.

And PRESS

Here, the equations are set in a high-medium-medium-low relationship when defining the X and Y values by setting three points of pressure as high, medium, and low, as follows.

Of these three, we find X and Y in (8) and (9),

Also, if you find X and Y in (9) and (10),

Where you choose X and Y values for Eq. (8), X, Y in (11) and (12), or X, Y in (11 ') and (12'). The criterion of is based on the analog / digital conversion value corresponding to the middle of the set pressure range.If the analog / digital value of the input pressure is larger than the reference value, select X and Y in the formulas (11) and (12). If it is small, it is transmitted to the computer 60 through the serial communication unit 50d so as to select X and Y in the formulas (11 ') and (12') so that the computer 60 processes the software.

Then, various initial values of the sub C oil 50c2 are set, and whether or not a key is input from the main C oil 50c1 is checked.

As a result of the check, if there is a key input, first turn on the LCD and execute the work for each key (S12). First, if the input key is an accumulated key, the corresponding information is displayed on the LCD while updating the counter for the accumulated key. The information is as follows.

1 time

A: Normally corrected value B: Normally corrected value

Episode 2

C: Normal correction value D: Abnormal correction value

3rd time

E: Cumulative uncorrected value F: Cumulative corrected value

When the second input key is a diagnostic key, the corresponding information is displayed on the LCD while the counter for the diagnostic key is updated. The displayed information is as follows.

1 time

G: State constant (Z) H: Measurement temperature / pressure

Episode 2

I: previous month's fine adjustment value J: previous month's correction value

3rd time

K: Self diagnostic data L: Total operating time

Third, when an information key is input, a message as shown below is displayed on the LCD screen, and when a number is input, an information value corresponding to the number is processed by the information processing routine and displayed again on the LCD.

Fourth, when the variable key is input, the following message is displayed on the LCD screen. If the number is entered, the variable value corresponding to the number is displayed on the LCD again in the variable processing routine.

There is a variable processing routine that shows the variable value entered above, and there is a variable information input mode. In the latter case, a cursor appears on the LCD screen to enter data to be entered into the variable, and then press the ENTER key to complete the variable information input routine. The program stores the data value entered in the variable number in RAM and displays the initial screen on the LCD screen when a key other than Enter is entered.

If there is no key input as a result of the check, the data (pulse, time, date) received from the main CPI 50c1 is updated, and the analog / digital conversion unit 50j is used for + 3V, + 6V, temperature and pressure. The analog / digital conversion for + 3V and + 6V is performed by checking whether the operating power supply of the analog / digital conversion unit 50j and the operating power of the sub-cpu 50c2 and peripheral devices are good. Each routine is executed (S13).

When the voltage (+ 6V, + 3V) is higher than the standard, it updates the total uncompensated volume, uncompensated volume per hour, uncompensated flow rate, etc. with the data received from the main CPI, and converts the current temperature and pressure value into analog / digital converter. The correction volume is calculated from 50j) and the total correction volume, hourly correction volume, correction flow rate, and normal uncorrected / corrected volume values are updated.

When the voltage is less than the standard, the voltage is not enough, so the power is abnormal. Therefore, the temperature and pressure values are not suitable for calculating the correction value. Update the uncorrected / corrected volume values at flow rate and abnormality (S14).

At the end of the routine when the voltage is above the reference and below the reference, the time counter is checked to update the total operating time on the ePyrom 50e after one hour, and the data is backed up on the SRAM 50e. Check to back up 12 months of corrected / uncorrected cumulative totals and check for leap year.

After all the above processes, the sub CPI 50c2 notifies the main CPI 50c1 of the work completion so that the main CPI 50c1 sets the power-off mode (S15).

As described in detail above, the present invention mechanically checks the amount of gas that has not been calibrated, so that a continuous analog flow pulse proportional to the amount of flowing gas is inputted from the gas volume compensator to communicate with a computer to perform software processing. By measuring the amount of gas accurately, the microprocessor is separated into the main and sub-cif oils, and the sub-cif oil with a large current consumption is supplied only when there is a key input or at a predetermined time to minimize the current consumption. .

Claims (6)

A flow pulse generator coupled to the gas meter for generating a continuous analog flow pulse proportional to the amount of gas mechanically flowing to the gas meter; A pressure sensor coupled to the gas meter that is exposed to a gas to measure the pressure of the gas and generate an analog signal proportional to the value; A temperature sensor coupled to the gas meter that is exposed to a gas to measure the temperature of the gas and generate an analog signal proportional to the value; A gas volume compensator for compensating software flow pulses inputted from the flow pulse generator according to pressures and temperature conditions received from pressure and temperature sensors; And a computer that communicates with the gas volume compensator when the gas volume compensator performs volume compensation of the gas meter to show the corrected value on the terminal screen or through a printer. The gas volume compensator of claim 1, further comprising: key input means capable of inputting a key signal so that a customer can view desired data; Pulse input means for receiving an input flow pulse; A microprocessor for controlling peripheral devices by a key signal input through the key input means; Serial communication means for performing communication with a computer to transmit and receive necessary data; Ipyrom which stores data that should not be lost when the battery is discharged or when the equipment itself loses its function; A storage switch, which is a kind of locking device for controlling important parameter values and possibility of calibration change; Power supply means for supplying power to the microprocessor and required portions; LCD display means for displaying a variety of information on the screen by the control of the microprocessor; Check means for checking the pressure and temperature of the gas flowing into the gas meter and checking whether the voltage supplied to the microprocessor is a reference voltage; Analog / digital conversion means for converting data transmitted through the check means into a digital value which is a physical quantity and providing the same to the microprocessor; An electronic device, comprising: a RAM for storing cumulative uncorrected volume values / corrected values, average temperature / pressure values, and uncorrected / corrected volume values in an abnormal state. The method of claim 2, wherein the check means includes a temperature sensor for receiving a constant current as an input and outputting a change in temperature as a change in resistance, a current / voltage converting means for converting a constant current value through the temperature sensor into a change in voltage; ; A pressure sensor that receives a constant voltage as an input and outputs a change in pressure as an amount of change in voltage, and a sample / holder means for separating different inputs input through the current / voltage converting means and the pressure sensor and applying it to an output terminal; ; Temperature and pressure voltage amplifying means for amplifying the input separated through the sample / holder means to a predetermined level, respectively; And an analog multiplexer for selecting only one of the voltages amplified by the amplifying means and applying it to the output terminal. The microprocessor of claim 2, further comprising: a main CPU for outputting a reset signal and necessary data every key input or at a predetermined time; And a sub-CPI that operates according to the reset signal of the main CPI, manages uncorrected values, correction values, and various data, checks the pressure and temperature of the gas, and controls each part requiring control. The electronic device according to claim 2, wherein the power supply means generates and supplies a driving power source, a communication power source, and an LCD driving power source. The method of claim 2, wherein the power supply means can supply the + voltage (+ 5V) and-voltage (-3V) to the LCD display means to meet the temperature conditions (-20 ~ +60 ℃) of the place where the LCD is installed. Electronic device characterized in that.