KR101567394B1 - Digital Water Meter capable of operating using External power supply - Google Patents

Digital Water Meter capable of operating using External power supply Download PDF

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Publication number
KR101567394B1
KR101567394B1 KR1020150053636A KR20150053636A KR101567394B1 KR 101567394 B1 KR101567394 B1 KR 101567394B1 KR 1020150053636 A KR1020150053636 A KR 1020150053636A KR 20150053636 A KR20150053636 A KR 20150053636A KR 101567394 B1 KR101567394 B1 KR 101567394B1
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KR
South Korea
Prior art keywords
water meter
digital water
power supply
battery
voltage
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KR1020150053636A
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Korean (ko)
Inventor
송행숙
송진욱
서창현
송양일
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주식회사 그린플로우
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Priority to KR1020150053636A priority Critical patent/KR101567394B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/06—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with tangential admission
    • G01F1/075—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with tangential admission with magnetic or electromagnetic coupling to the indicating device
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/10—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with axial admission
    • G01F1/115—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with axial admission with magnetic or electromagnetic coupling to the indicating device

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Measuring Volume Flow (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

The present invention relates to a digital water meter capable of operating in response to an external power supply, and more particularly, to a digital water meter capable of supplying power from an outdoor water meter and a digital water meter, The problem that the integrated flow rate value can not be confirmed when a battery problem occurs in the digital water meter is solved and the battery use time is shortened due to a battery or an external environmental problem. In this case, the remaining power from the outdoor indicator is supplied to the digital water meter, so that the operation time of the digital water meter is increased without using the internal battery of the digital water meter. Through power supplied The present invention relates to a digital water meter capable of being operated by being supplied with external power for enabling operation.

Description

[0001] The present invention relates to a digital water meter capable of operating with an external power supply,

The present invention relates to a digital water meter capable of operating in response to an external power supply, and more particularly, to a digital water meter capable of supplying power from an outdoor water meter and a digital water meter, The problem that the integrated flow rate value can not be confirmed when a battery problem occurs in the digital water meter is solved and the battery use time is shortened due to a battery or an external environmental problem. In this case, the remaining power from the outdoor indicator is supplied to the digital water meter, so that the operation time of the digital water meter is increased without using the internal battery of the digital water meter. If a problem occurs in the battery of the digital water meter, Through power supplied The present invention relates to a digital water meter capable of being operated by being supplied with external power for enabling operation.

Generally, water meters are divided into mechanical water meters and digital water meters.

The mechanical water meter transmits the rotation of the impeller to the gear group or the corresponding magnet for transmitting the rotation of the impeller and the upper magnet of the impeller according to the rotation of the impeller, and displays the accumulated value as a scale or number through the gear group The gear is worn out or foreign matter is caught in it and it can not achieve accurate weighing.

In particular, the digital water meter related to the present invention compensates for the disadvantages of the conventional mechanical water meter and, in order to provide convenience of meter reading, when the magnet on the upper part of the impeller rotates without using a gear group, And to use the method of recognition. The rotational speed of the impeller can be known by the rotational angle, and the flow rate according to the rotational speed can be converted.

As described above, since the rotation of the impeller can be detected through the sensor, the conventional disadvantages can be compensated for and convenience of the meter reading can be brought about. However, since the power source for driving the electronic part is required, The life of the battery is shortened due to a temperature factor and a defective production process, and thus the life of the battery can not be guaranteed.

That is, the conventional digital water meter frequently suffers from the loss of function of the digital water meter due to abnormal consumption of the battery.

As mentioned above, the biggest problem of the conventional digital water meter is that when the battery is in trouble, the accumulated flow rate can not be seen.

The mechanical water meter can detect the state before a problem occurs even if a problem occurs. However, since the digital water meter can not know the accumulated amount through the LCD screen or communication when a battery trouble occurs, the maximum It becomes a stumbling block.

A typical digital water meter or battery consumption can be used for at least nine years, but a metering device that can not exceed the minimum life span (8 years) due to changes in various conditions, such as mistakes in production processes and changes in external temperature.

Therefore, a technique for fundamentally solving this has become necessary.

Korean Registered Patent No. 10-1265150 (June 3, 2013)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

An object of the present invention is to solve the problem that the integrated flow rate value can not be confirmed at the time of occurrence of a battery trouble in a digital water meter and the battery use time is shortened due to a battery or an external environment problem. The extra power remaining in the outdoor indication unit is supplied to the digital water meter so as to extend the operation time without using the internal battery of the digital water meter, and if the battery of the digital water meter has a problem, And operation is enabled through power supplied from the instruction unit.

In addition, when the outdoor instruction unit and the digital water meter are all in trouble, it is possible to configure the battery on the power supply line from the outside.

In addition, a protective circuit portion such as an overcurrent and a reverse voltage is provided so as to prevent system breakdown caused by a short circuit at the time of production and storage and a system connection failure caused by a wrong connection at the time of installation.

In order to achieve the object of the present invention,

The digital water meter, which can operate by receiving external power according to an embodiment of the present invention,

An operation voltage adjustment and anti-static circuit 110 for preventing the central processing unit 40 from malfunctioning when a high-voltage static electricity is inputted, adjusting the operation voltage within the operating voltage when the power supply is higher than the set voltage,

An internal leakage current prevention circuit 120 for preventing internal leakage of current in the internal battery when the reverse voltage is applied,

The internal battery power supply is cut off when the external battery voltage is lower than the internal battery power. If the voltage is lower than the operation voltage or when the external power supply is not applied, the internal battery is operated. A digital water meter 100 configured to include an internal battery power source circuit 130;

An external power supply circuit unit 210 for checking the remaining capacity of the internal battery and supplying power to the digital water meter when communication is established with the digital water meter,

An internal battery protection circuit unit 220 for preventing a battery in the outdoor instruction unit from rapidly discharging due to an overcurrent,

An overcurrent output recognition circuit unit 230 for turning off the external power supply circuit unit 210 to interrupt power supply when the overcurrent is recognized,

A noise prevention circuit unit 240 for preventing external noise,

And an outdoor instruction unit 200 configured to include a reverse voltage protection circuit unit 250 formed to protect internal circuits from reverse voltage, thereby solving the problems of the present invention.

A digital water meter capable of operating with an external power supply according to the present invention comprises:

In the case of a digital water meter, the problem that the integrated flow rate value can not be confirmed when the battery trouble occurs is solved, and the battery use time is shortened due to the battery or external environmental problems. In order to extend the internal battery usage time, And the remaining capacity in the digital water meter is supplied to the digital water meter so as to operate without using the internal battery of the digital water meter, thereby greatly increasing the operating time, and even if a problem occurs in the battery of the digital water meter, It is possible to solve the disadvantage that the flow rate value can not be confirmed when the internal water meter of the digital water meter is exhausted and the effect of maximizing the use time can be provided.

In addition, when the outdoor instruction unit and the digital water meter all have a problem, the power supply line can be configured to have an external battery to provide an effect that can be confirmed.

That is, power can be supplied from the outside through a battery without an outdoor instruction unit, thereby solving the problems of the prior art.

For example, if you connect a battery of 2.6V or more and 12V or less from the outside, you can check the status by operating it.

In addition, a protection circuit such as an overcurrent and a reverse voltage can be provided to prevent system breakdown caused by a short circuit during a system breakdown or installation during installation and storage, thereby providing system stabilization.

FIG. 1 is a general block diagram of a digital water meter that can be operated by receiving external power according to an embodiment of the present invention, and FIG. 2 is a general block diagram of an outdoor indicator.
3 is a circuit diagram of a digital water meter capable of operating with an external power supply according to an embodiment of the present invention and an outdoor instruction unit for supplying power.
FIG. 4 is a circuit diagram of a digital water meter capable of operating with an external power supply according to an embodiment of the present invention.
FIG. 5 is an illustration of a power supply circuit for entering an outdoor instruction unit of a digital water meter capable of operating with an external power supply according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a digital water meter capable of operating with external power supply according to the present invention will be described in detail.

FIG. 1 is a general block diagram of a digital water meter that can be operated by receiving external power according to an embodiment of the present invention, and FIG. 2 is a general block diagram of an outdoor indicator.

1, a general digital water meter includes a communication driver 10, an LCD panel 30, an MR sensor 50, a battery 60, and a central processing unit 40 for performing overall control .

The general outdoor unit includes a communication driver 10a, an LCD panel 30a, an outdoor button 50a, a battery 60a, and a central processing unit 40a for performing overall control.

As described above, since the general digital water meter is operated independently from the outdoor instruction unit, if a problem occurs in the life of the battery, the power supply can not be supplied from the outside, and the calculated flow rate value can not be seen.

In addition, since the digital water meter has to be waterproof, the interior is molded and can not be seen.

3 is a circuit diagram of a digital water meter capable of operating with an external power supply according to an embodiment of the present invention and an outdoor instruction unit for supplying power.

3, the digital water meter 100 of the present invention includes an operation voltage adjusting and anti-static circuit unit 110, an internal battery current leakage prevention circuit unit 120, an internal battery power source operation circuit unit 130 ).

The operation voltage adjustment and anti-static circuit unit 110 adjusts the operation voltage within the operation voltage when the supply voltage is equal to or higher than the set voltage, and prevents the central processing unit 40 from malfunctioning when a high-voltage static electricity flows.

In other words, it protects the system from static electricity.

For example, when the power supply is 3.6 V or more, the adjustment is performed within a voltage range for protecting and operating the water meter. When static electricity is supplied, the system is protected by discharging through D11 shown in the figure.

The reverse voltage protection circuit portion is configured to prevent reverse voltage application.

In addition, the battery internal current leakage preventing circuit portion 120 prevents current in the internal battery from leaking to the outside when a reverse voltage is applied.

That is, it is configured on one side of the operation voltage adjustment and anti-static circuit part 110 to prevent the current in the internal battery from leaking to the outside when the external voltage is applied to the reverse voltage or below the operation power source.

In addition, the internal battery power operation circuit unit 130 interrupts the supply of internal battery power when the external battery voltage is lower than the internal battery power but is at an operable voltage. When the voltage is lower than the operable voltage, It is configured to operate with the power of the internal battery.

For example, if the system operation power source is abnormal even when the power is turned on, it is a circuit unit for ensuring Q8 operation. When the external power is applied, the power supply of the internal battery is cut off. When the external power is not applied, As shown in FIG.

The outdoor instruction unit 200 of the present invention includes an external power supply circuit unit 210, an internal battery protection circuit unit 220, an overcurrent output recognition circuit unit 230, a noise prevention circuit unit 240, And a circuit unit 250.

The external power supply circuit unit 210 is configured to receive the power of the digital water meter by checking the remaining amount of the internal battery when communication is established with the digital water meter.

Specifically, the external power supply circuit unit 210 is connected to the digital water meter by serial communication. The external power supply circuit unit 210 maintains the on state when the remaining battery power is equal to or greater than the set value. After the digital power meter is connected to the digital water meter by serial communication, In case of pressing the button of the outdoor indicator, it is turned on for 30 seconds.

This is to power the dead digital water meter and run it, and to read accumulated flow to date.

For example, the ON condition is a connection between the digital water meter and the outdoor display unit through serial communication, and the outdoor indicator battery level is more than 80%.

On the other hand, when the remaining amount of the battery of the outdoor indication unit is less than 80% and the serial waterproof meter no longer responds to the condition, the button 50a of the outdoor instruction unit is turned on for 30 seconds.

The internal battery protection circuit unit 220 prevents an internal battery from rapidly discharging due to an overcurrent flow.

For example, when the Vcc output terminal (EXT_Vcc_OUT) is connected to the ground or is connected to the '-' power supply, the overcurrent is prevented from flowing.

That is, the overcurrent output recognizing circuit unit 230 is configured to recognize the overcurrent.

At this time, the overcurrent output recognition circuit unit 230 turns off the external power supply circuit unit 210 to interrupt the power supply when recognizing the current.

Specifically, since the overcurrent output recognizing circuit unit 230 is in the off state, the current is not consumed. When the overcurrent is recognized, the overcurrent output recognizing circuit unit 230 operates only when the overcurrent is recognized. Therefore, the overcurrent output recognizing circuit 230 provides the recognized state to the central processing unit.

Therefore, in the central processing unit, the external power supply circuit unit 210 is turned off to interrupt the power supply.

The noise prevention circuit unit 240 is configured to prevent noise from entering from the outside.

Also, the reverse voltage protection circuit part 250 is formed to protect the internal circuits from the reverse voltage.

That is, the voltage is higher than the internal battery voltage through the EXT_Vcc_OUT terminal because there is a wrong connection from the outside, and the current flows into the inside to prevent the circuit from being destroyed.

FIG. 4 is a circuit diagram of a digital water meter capable of operating with an external power supply according to an embodiment of the present invention.

That is, the voltage regulation and anti-static circuit 110 constitutes R12 on the EXT_Vcc_IN line and D11 on the other end of R12.

If the operation voltage is exceeded by D11, it is adjusted to within the operating voltage. In case R12 has wrong polarity of the external battery, the external battery is discharged through D11 and it is disabled. .

In addition, D11 absorbs high voltage due to static electricity and prevents high voltage from entering into the system, thus making the system stable operation.

For example, when a power supply of 3.6V or more is connected from the outside, 3.6V or more is consumed by D11 (TVS diode) to protect the circuit, and current consumption is limited by R12.

When external static electricity is applied, D11 (TVS diode) absorbs and protects the circuit, and high frequency surge voltage passing through D11 is blocked by L4 (bead).

Meanwhile, a bead L4 is formed on one side of the voltage regulation and anti-static circuit part 110, an external leakage current prevention circuit part 120 is formed on the other end of the bead L4, The circuit unit 120 includes a rectifying diode D7 at the other end of the bead L4 line and a rectifying diode D9 between the bead L4 and the rectifying diode D7 , A rectifying diode D8 is formed on one side, and a Vcc line is formed between the rectifying diode D9 and the rectifying diode D8.

In addition, C6 is formed on the Vcc line, and this power source is used as a power source of the digital water meter.

As described above, when the voltage is lower than the reverse voltage or the internal battery voltage, the internal current in the internal battery is prevented from leaking to the outside.

For example, if 0 V or less is applied to the outside, reverse bias is applied to D9 to prevent the internal power source from going out, and D7 prevents Q11 from malfunctioning.

D8 is an external voltage of 3.5V and internal battery voltage is 3V, it prevents the reverse flow to the battery. Since it is not a rechargeable battery, it is not charged because it flows in the reverse direction. It only increases.

The internal battery power supply circuit unit 130 forms Q10, connects R15 to the base of Q10, connects R11 to the collector, and Q8 between R11 and the collector.

Further, Q11 is formed at the other end of R15, and R13 and R14 are formed at the base of Q11.

For example, when 3.5 V is applied from the outside, Q11 is operated by R13 and R14 voltage distribution through D7 through R12 through R12.

When Q11 operates, Q10 operates. When Q10 operates, Q8 becomes 0ff.

If external power is less than 2.5V, Q11 does not operate due to R13, R14 voltage distribution through R12, L4 and D7. If Q11 does not operate, Q10 does not operate, and Q8 operates do.

When Q8 is activated, battery power is supplied via Q8 and D8.

FIG. 5 is an illustration of a power supply circuit for entering an outdoor instruction unit of a digital water meter capable of operating with an external power supply according to an embodiment of the present invention.

The embodiment of Fig. 5 is presented to explain the circuit configuration of Fig. 3 in more detail.

The external power supply circuit unit 210 constitutes R8 and constitutes Q6 in parallel.

As described above, when communication is established with the digital water meter, the remaining power of the internal battery is checked to supply power to the digital water meter.

The internal battery protection circuit unit 220 is composed of R7, which is a resistor for recognizing an overcurrent and for limiting an overcurrent.

That is, R7 is configured to prevent the internal battery from being rapidly discharged due to the discharge of the overcurrent.

The overcurrent output recognizing circuit unit 230 includes R9 at the other end of R7, connects R9 to the base of Q7, constitutes R10 at the collector, and C4 in parallel with R10.

Therefore, when recognizing the overcurrent, Q7 turns on and sends the status value to the central processing unit.

Thereafter, the external power supply circuit unit 210 is turned off to interrupt the power supply.

The noise prevention circuit unit 240 prevents noise from the outside.

The reverse voltage protection circuit part 250 is formed of D6 at the other end of L3 and is formed to protect internal circuits from reverse voltage.

At this time, the EXT_Vcc_OUT terminal is provided on one side of D6 as shown in the figure, and the supplied power is supplied to the digital water meter.

For example, if the digital water meter is normally connected to the EXT_Vcc_OUT terminal, the status is requested through the serial communication.

Preferably, a request is made once a day, but the number of requests can be changed depending on the situation.

At this time, if there is a status response, check the internal battery status and if it is kept 80% or more, turn on Q6 to supply power to the digital water meter.

If the internal battery capacity drops below 80%, Q6 is turned off.

If the user can not obtain data even if the user requests the data through serial communication while the power supply is turned off, pressing the button of the outdoor indicator turns on Q6 for 30 seconds so that the user can check the state of the digital water meter.

However, if gnd is connected to the EXT_Vcc_OUT terminal due to improper wiring, turning on Q6 to supply power at 80% or more of battery condition causes overcurrent to flow. In this case, most of the voltage is applied to R7. When the voltage of R7 is ON and Q7 is ON, voltage is applied to R10 and the central processing unit recognizes this signal. At this time, Q6 is turned off, It is to block the supply.

In this case, after one day has elapsed, it is judged again and the power supply is confirmed again.

If static electricity enters the EXT_Vcc_OUT terminal during normal wiring or wiring or not during storage or transportation, it is blocked by the reverse voltage protection circuit part 250, and a part of the static electricity is blocked again by the noise prevention circuit part 240 .

The above-described configuration and operation improves the problem that the accumulated flow rate value can not be confirmed at the time of occurrence of the battery problem in the digital water meter, and the battery use time is shortened due to the battery or external environment problem. In order to extend the usage time, extra power remaining in the outdoor indicator is supplied to the digital water meter, so that the operation time of the digital water meter is increased without using the internal battery of the digital water meter, It is possible to maximize the use time and the effect of solving the disadvantage that the flow rate value can not be confirmed when the internal battery of the digital water meter is exhausted by making the operation possible through the power supplied from the outdoor instruction unit.

It will be appreciated by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is to be understood, therefore, that the embodiments described above are to be considered in all respects as illustrative and not restrictive.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Digital water meter
200: outdoor indicator

Claims (4)

In a digital water meter,
An operation voltage adjustment and anti-static circuit 110 for preventing the central processing unit 40 from malfunctioning when a high-voltage static electricity is inputted, adjusting the operation voltage within the operating voltage when the power supply is higher than the set voltage,
An internal leakage current prevention circuit 120 for preventing internal leakage of current in the internal battery when the reverse voltage is applied,
The internal battery power supply is cut off when the external battery voltage is lower than the internal battery power. If the voltage is lower than the operation voltage or when the external power supply is not applied, the internal battery is operated. A digital water meter 100 configured to include an internal battery power source circuit 130;
An external power supply circuit unit 210 for checking the remaining capacity of the internal battery and supplying power to the digital water meter when communication is established with the digital water meter,
An internal battery protection circuit unit 220 for preventing a battery in the outdoor instruction unit from rapidly discharging due to an overcurrent,
An overcurrent output recognition circuit unit 230 for turning off the external power supply circuit unit 210 to interrupt power supply when the overcurrent is recognized,
A noise prevention circuit unit 240 for preventing external noise,
It shall be composed, including,; outdoor instruction unit 200 is composed of a reverse voltage protection circuit part 250 is formed to protect the internal circuitry from the reverse voltage
The outdoor indicator and the digital water meter make it possible to configure the battery from the outside on the power supply line in case of trouble,
A bead L4 is formed on one side of the voltage regulation and antistatic circuit section 110 and an external leakage current prevention circuit section 120 is formed on the other end of the bead L4, 120 constitute a rectifying diode D7 at the other end of the bead L4 line and a rectifying diode D9 between the bead L4 and the rectifying diode D7 and are connected to one end of the rectifying diode D9 A rectifier diode D8 and a Vcc line between the rectifier diode D9 and the rectifier diode D8 . The digital water meter according to claim 1,
The method according to claim 1,
Wherein the digital water meter and the outdoor instruction unit comprise:
Wherein the power supply unit is connected to the power supply line, the ground line, the transmission line, the water supply line, and the power supply line so as to perform data transmission / reception and power supply between the digital water meter and the outdoor indication unit.
The method according to claim 1,
The external power supply circuit unit 210,
It is kept on when connected to digital water meter by serial communication, or when the remaining battery level is over the set value,
And a digital water meter capable of operating in response to an external power supply when the external data is not received, or when an external battery remaining amount is less than a set value after the digital water meter is connected with the serial communication. . The method according to claim 1,
The internal battery protection circuit part (220)
And the Vcc output terminal is connected to the ground or is connected to the power source, the overcurrent is prevented.
KR1020150053636A 2015-04-16 2015-04-16 Digital Water Meter capable of operating using External power supply KR101567394B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101632931B1 (en) * 2015-12-11 2016-06-23 주식회사 디엠파워 Method and system for measuring based on two wire power line communication using low voltage
KR20220145607A (en) 2021-04-22 2022-10-31 주식회사 청호정밀 Apparatus for supplying auxiliary power to digital water meter and transmitting detection signal, and control method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200468933Y1 (en) * 2012-04-27 2013-09-10 송창석 Measuring apparatus to measure discharge and reading system using the same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200468933Y1 (en) * 2012-04-27 2013-09-10 송창석 Measuring apparatus to measure discharge and reading system using the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101632931B1 (en) * 2015-12-11 2016-06-23 주식회사 디엠파워 Method and system for measuring based on two wire power line communication using low voltage
KR20220145607A (en) 2021-04-22 2022-10-31 주식회사 청호정밀 Apparatus for supplying auxiliary power to digital water meter and transmitting detection signal, and control method thereof

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