JP2008170369A - Watt-hour meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a watt-hour meter that is improved in safety, with respect to leaks and electrical shocks. <P>SOLUTION: The watt-hour meter includes an alternating current to direct current transforming part 103 that transfers an alternating-current voltage, supplied from an outside into a low-level direct-current voltage; an output terminal part 102 that outputs the direct-current voltage of the low-level direct current load; and a watt-hour measuring means for measuring the watt hours used in the load of consumers by the low-level direct-current voltage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a watt-hour meter that measures the power consumption of a system under measurement.

Conventionally, watt-hour meters that measure power data, such as the amount of power used by ordinary households, factories, and offices, have become widespread. The power meter includes a power calculation unit that measures and calculates the power of the system to be measured, a control unit that edits the calculation result calculated by the power calculation unit into power data such as used power amount and maximum used power, And a display unit for displaying the power data edited in the unit. (For example, patent document 1).
JP 2004-226094 A (page 10, FIG. 2)

However, when a conventional watt-hour meter is used, since a distribution line such as an AC 100V is wired in the home, there is a problem that a fire or an electric shock accident may occur due to electric leakage.

An object of the present invention is to provide a watt-hour meter that improves the above-described problems and has improved safety against electric leakage and electric shock.

In order to achieve the above object, a watt-hour meter according to the present invention includes an AC / DC conversion means for converting an AC voltage supplied from the outside into a DC voltage, and a voltage of the DC voltage converted by the AC / DC conversion means. Voltage detecting means for detecting, current detecting means for detecting the current of the DC voltage converted by the AC / DC converting means, a signal relating to the DC voltage detected by the voltage detecting means, and the DC detected by the current detecting means A power calculation means for measuring the power consumption of the system under measurement by multiplying a signal related to the current, and an output means for outputting the power consumption of the system under measurement measured by the power calculation means, To do.

According to the present invention, electrical appliances that can operate at a low level of DC voltage can be supplied with power at a low level of DC, thus improving safety against electric leakage and electric shock. An electricity meter can be provided.

  Examples of the present invention will be described below.

  A first embodiment of a watt-hour meter according to the present invention will be described with reference to FIG. FIG. 1 is an internal configuration diagram showing a first embodiment of a watt-hour meter according to the present invention.

  In FIG. 1, 100 is a watt-hour meter main body.

Reference numeral 101 denotes an input terminal portion, which has a configuration in which a conductive portion made of a conductive metal such as brass or copper is disposed on a fixed portion made of a highly insulating plastic material such as phenol resin or PBT resin. Then, a distribution line from an external power supply facility is connected to the watt hour meter main body 100.

Reference numeral 102 denotes an output terminal portion having a configuration in which a conductive portion made of a conductive metal such as brass or copper is disposed on a fixed portion made of a highly insulating material such as phenol resin or PBT resin. The distribution line to the load in the consumer is connected to the watt-hour meter main body 100.

Reference numeral 103 denotes an AC / DC converter, which includes a DC converter using pulse width modulation and a DC converter using a thyristor, which converts an AC voltage supplied to the input terminal unit 101 into a low-level DC voltage, Output to the output terminal 102 side.

Reference numeral 104 denotes a current detection unit, which is composed of a circuit combining a current sensor composed of a Hall element or the like and an analog-digital converter, and is digital data that is directly proportional to the DC current flowing from the AC / DC converter 103 to the output terminal unit 102. Output a signal.

Reference numeral 105 denotes a voltage detector, which is composed of a circuit combining an attenuator and an analog-digital converter, and outputs a digital data signal that is directly proportional to the DC voltage converted by the AC / DC converter 103.

A multiplication unit 106 includes a digital multiplication circuit and the like. The digital data signal directly proportional to the direct current output from the current detection unit 104 and the digital data signal directly proportional to the direct current voltage output from the voltage detection unit 105 are obtained. Multiply and output a digital data signal that is directly proportional to the power used.

Reference numeral 107 denotes an integration unit which is configured by a counter circuit or the like, and integrates and measures a digital data signal output from the multiplication unit 106 in direct proportion to the consumer's power consumption, and creates data related to the consumer's power consumption.

Reference numeral 108 denotes a display unit that includes a liquid crystal display or the like, and displays data related to the amount of power used by the consumer that is integrated and measured by the integration unit 107.

  Next, the operation of this embodiment will be described. The AC voltage such as 100V input to the input terminal unit 101 is converted into a low-level DC voltage such as 12V by the AC / DC converter 103. The low-level DC voltage is supplied to a load such as an electric appliance in the consumer via the output terminal unit 102. The AC / DC converter 103 is configured by a step-down circuit using pulse width modulation or a DC converter circuit using a thyristor, and converts an AC voltage supplied from the outside into DC. In the AC / DC converter 103, an input side to which AC is input and an output side to which DC is output are insulated by an insulating transformer.

  The current detection unit 104 detects a direct current flowing through the load via the output terminal 102, performs analog-digital conversion, and outputs a digital data signal directly proportional to the current to the multiplication unit 106.

  The voltage detector 105 detects the low-level DC voltage converted by the AC / DC converter 103, performs analog-digital conversion, and outputs a digital data signal directly proportional to the voltage to the multiplier 106.

The multiplication unit 106 is configured by a digital multiplication circuit or the like, and multiplies the digital data signal directly proportional to the current output from the current detection unit 104 and the digital data signal directly proportional to the voltage output from the voltage detection unit 105. Then, it is converted into a pulse frequency signal that is directly proportional to the power used and output to the integrating unit 107.

The integrating unit 107 is configured by a counter circuit or the like, and integrates and measures a pulse frequency signal that is directly proportional to the used power output from the multiplying unit 106, creates data related to the consumed power amount of the consumer, and displays the display unit 108. Is output.

The display unit 108 is composed of a liquid crystal display or the like, and displays data related to the amount of power used by the consumer created by the integrating unit 107.

  In recent years, electrical appliances used in homes are frequently used for electronic components and can operate with low-voltage direct current. Various household appliances convert the supplied voltage, such as AC 100 V, into a low-voltage DC voltage by a so-called AC adapter or a power supply circuit in the appliance and supply it to the appliance. There are many types of electrical appliances that use AC adapters, such as chargers for mobile phones and personal computers. It is not desirable to supply electric power to such electrical appliances that can operate with low-voltage direct current through a distribution line of AC 100 V or the like in the home because it causes a fire due to leakage such as so-called tracking or an electric shock accident. If this embodiment is used, an AC voltage supplied from an external power supply company is converted into a low-level DC voltage and supplied to household appliances. Therefore, the voltage is low, electric leakage is unlikely to occur, and electric shock is also generated. Hateful. It is also possible to simplify household power distribution facilities. Furthermore, the power supply circuit of the electric appliance used at home can be simplified, and a low-cost electric appliance is supplied.

As described above, if the present invention is used, it is possible to supply electric power to electrical appliances that can operate at a DC voltage at a low DC voltage, thereby improving safety against electric leakage and electric shock. An electronic watt-hour meter can be provided.

  Embodiment 2 of the watt-hour meter according to the present invention will be described with reference to FIG. FIG. 2 is an internal block diagram showing Embodiment 2 of the watt-hour meter according to the present invention.

The difference between the second embodiment and the first embodiment is that, in the first embodiment, the AC voltage supplied to the input terminal unit 101 is converted into a low-level DC voltage by the AC / DC conversion unit 103, and then passed through the output terminal unit 102. The data relating to the power consumption of the DC voltage supplied to a load such as an electric appliance in the consumer and used by the consumer at the multiplier 106 and the integrator 107 is created and displayed on the display unit 108. On the other hand, in the second embodiment, the AC voltage supplied to the input terminal unit 101 is converted into a low-level DC voltage by the AC / DC conversion unit 103, and the AC voltage is output to the output terminal unit 202 via the output terminal unit 102. Is supplied to a load such as an electrical appliance in the consumer via the data, and data relating to the amount of power used by the DC voltage used by the consumer at the multiplication unit 106 and the integration unit 107 is created and displayed on the display unit 108. Multiplication 206, data is generated about the electric power consumption of the AC voltage used in consumer by integrating unit 207, a point displayed on the display unit 208.

  In FIG. 2, reference numeral 200 denotes a power meter main body.

Reference numeral 101 denotes an input terminal portion, which has a configuration in which a conductive portion made of a conductive metal such as brass or copper is disposed on a fixed portion made of a highly insulating plastic material such as phenol resin or PBT resin. Then, a distribution line from an external power supply facility is connected to the watt hour meter main body 200.

Reference numeral 102 denotes an output terminal portion having a configuration in which a conductive portion made of a conductive metal such as brass or copper is disposed on a fixed portion made of a highly insulating material such as phenol resin or PBT resin. The distribution line to the DC load in the consumer is connected to the watt-hour meter main body 200.

Reference numeral 103 denotes an AC / DC converter, which includes a DC converter using pulse width modulation and a DC converter using a thyristor, which converts an AC voltage supplied to the input terminal unit 101 into a low-level DC voltage, Output to the output terminal 102 side.

Reference numeral 104 denotes a current detection unit, which is composed of a circuit combining a current sensor composed of a Hall element or the like and an analog-digital converter, and is digital data that is directly proportional to the DC current flowing from the AC / DC converter 103 to the output terminal unit 102. Output a signal.

Reference numeral 105 denotes a voltage detector, which is composed of a circuit combining an attenuator and an analog-digital converter, and outputs a digital data signal that is directly proportional to the DC voltage converted by the AC / DC converter 103.

A multiplication unit 106 includes a digital multiplication circuit and the like. The digital data signal directly proportional to the direct current output from the current detection unit 104 and the digital data signal directly proportional to the direct current voltage output from the voltage detection unit 105 are obtained. Multiply and output a digital data signal that is directly proportional to the power used.

Reference numeral 107 denotes an integration unit which is configured by a counter circuit or the like, and integrates and measures a digital data signal output from the multiplication unit 106 in direct proportion to the consumer's power consumption, and obtains data related to the consumer's DC load power consumption. create.

Reference numeral 108 denotes a liquid crystal display or the like which is a display unit, and displays data related to the electric power consumption of the consumer's DC load, which is integrated and measured by the integration unit 107.

Reference numeral 202 denotes an output terminal portion having a configuration in which a conductive portion made of a conductive metal such as brass or copper is disposed on a fixed portion made of a material such as phenol resin or PBT resin having high insulating properties. The distribution line to the AC load in the consumer is connected to the watt-hour meter main body 200.

Reference numeral 204 denotes a current detection unit, which includes a circuit that combines a current sensor composed of a current transformer, a Hall element, and the like and an analog-digital converter, and is directly proportional to the alternating current flowing from the input terminal unit 101 to the output terminal unit 202. Outputs digital data signals.

Reference numeral 205 denotes a voltage detection unit, which includes a circuit that combines a voltage transformer and an analog-digital converter, and outputs a digital data signal that is directly proportional to the AC voltage supplied to the input terminal unit 101.

A multiplication unit 206 includes a digital multiplication circuit and the like. The digital data signal directly proportional to the alternating current output from the current detection unit 204 and the digital data signal directly proportional to the alternating voltage output from the voltage detection unit 205 are displayed. Multiply and output a digital data signal that is directly proportional to the power used.

Reference numeral 207 denotes an integration unit that is configured by a counter circuit or the like. The integration unit 207 integrates and measures a digital data signal output from the multiplication unit 206 in direct proportion to the consumer's power consumption, and stores data related to the consumer's AC load power consumption. create.

A display unit 208 includes a liquid crystal display or the like, and displays data related to the power consumption of the AC load of the consumer that is integrated and measured by the integration unit 207.

If the said Example is used, the electric energy used of the direct current load used by a consumer will be measured in the electric current detection part 104, the voltage detection part 105, the multiplication part 106, the integrating | accumulating part 107, and the display part 108, and the electric current detection part 204 will be measured. Since the power consumption of the AC load used by the consumer is measured by the voltage detection unit 205, the multiplication unit 206, the integration unit 207, and the display unit 208, the consumer uses the DC load, the AC load, or both. In this case, it is possible to measure the power consumption of each load.

If this embodiment is used, an AC voltage supplied from an external power supply company is converted into a low-level DC voltage and supplied to household appliances. Therefore, the voltage is low, electric leakage is unlikely to occur, and electric shock is also generated. Hateful. It is also possible to simplify household power distribution facilities. Furthermore, the power supply circuit of the electric appliance used at home can be simplified, and a low-cost electric appliance is supplied.

As described above, according to the present invention, electric appliances that can operate at a DC voltage can be supplied with electric power at a low DC voltage. An improved electronic watt-hour meter can be provided.

  Embodiment 3 of the watt-hour meter according to the present invention will be described with reference to FIG. FIG. 3 is an internal block diagram showing Embodiment 3 of the watt-hour meter according to the present invention.

The third embodiment is different from the second embodiment in the second embodiment in which the current detection unit 104, the voltage detection unit 105, the multiplication unit 106, the integration unit 107, and the display unit 108 have a DC load used by consumers. The amount of power used is individually measured by the current detection unit 204, the voltage detection unit 205, the multiplication unit 206, the integration unit 207, and the display unit 208. On the other hand, in the third embodiment, the power consumption of the DC load and the AC load is added and measured using the combining unit 301.

  In FIG. 3, 300 is a watt-hour meter main body.

Reference numeral 101 denotes an input terminal portion, which has a configuration in which a conductive portion made of a conductive metal such as brass or copper is disposed on a fixed portion made of a highly insulating plastic material such as phenol resin or PBT resin. Then, a distribution line from an external power feeding facility is connected to the watt-hour meter main body 300.

Reference numeral 102 denotes an output terminal portion having a configuration in which a conductive portion made of a conductive metal such as brass or copper is disposed on a fixed portion made of a highly insulating material such as phenol resin or PBT resin. The distribution line to the DC load in the consumer is connected to the watt-hour meter main body 300.

Reference numeral 103 denotes an AC / DC converter, which includes a DC converter using pulse width modulation and a DC converter using a thyristor, which converts an AC voltage supplied to the input terminal unit 101 into a low-level DC voltage, Output to the output terminal 102 side.

Reference numeral 104 denotes a current detection unit, which is composed of a circuit combining a current sensor composed of a Hall element or the like and an analog-digital converter, and is digital data that is directly proportional to the DC current flowing from the AC / DC converter 103 to the output terminal unit 102. Output a signal.

Reference numeral 105 denotes a voltage detector, which is composed of a circuit combining an attenuator and an analog-digital converter, and outputs a digital data signal that is directly proportional to the DC voltage converted by the AC / DC converter 103.

A multiplication unit 106 includes a digital multiplication circuit and the like. The digital data signal directly proportional to the direct current output from the current detection unit 104 and the digital data signal directly proportional to the direct current voltage output from the voltage detection unit 105 are obtained. Multiply and output a digital data signal that is directly proportional to the power used.

Reference numeral 107 denotes an integration unit which is configured by a counter circuit or the like, and integrates and measures a digital data signal output from the multiplication unit 106 in direct proportion to the consumer's power consumption, and obtains data related to the consumer's DC load power consumption. create.

Reference numeral 202 denotes an output terminal portion having a configuration in which a conductive portion made of a conductive metal such as brass or copper is disposed on a fixed portion made of a material such as phenol resin or PBT resin having high insulating properties. The distribution line to the AC load in the consumer is connected to the watt-hour meter main body 300.

Reference numeral 204 denotes a current detection unit, which includes a circuit that combines a current sensor composed of a current transformer, a Hall element, and the like and an analog-digital converter, and is directly proportional to the alternating current flowing from the input terminal unit 101 to the output terminal unit 202. Outputs digital data signals.

Reference numeral 205 denotes a voltage detection unit, which includes a circuit that combines a voltage transformer and an analog-digital converter, and outputs a digital data signal that is directly proportional to the AC voltage supplied to the input terminal unit 101.

A multiplication unit 206 includes a digital multiplication circuit and the like. The digital data signal directly proportional to the alternating current output from the current detection unit 204 and the digital data signal directly proportional to the alternating voltage output from the voltage detection unit 205 are displayed. Multiply and output a digital data signal that is directly proportional to the power used.

Reference numeral 207 denotes an integration unit that is configured by a counter circuit or the like. The integration unit 207 integrates and measures a digital data signal output from the multiplication unit 206 in direct proportion to the consumer's power consumption, and stores data related to the consumer's AC load power consumption. create.

Reference numeral 301 denotes a synthesizing unit that adds together data related to the power consumption of the DC load output from the integration unit 107 and data related to the power consumption of the AC load output from the integration unit 207.

Reference numeral 302 denotes a display unit that includes a liquid crystal display or the like, and displays a total value of the power consumption of the DC load and the power consumption of the AC load output from the combining unit 301 as the consumer's power consumption.

The state which attached the watt-hour meter concerning Example 3 to the consumer is shown in FIG.

If the said Example is used, the electric energy used of the DC load used by a consumer will be measured in the electric current detection part 104, the voltage detection part 105, the multiplication part 106, and the integrating | accumulating part 107, and the electric current detection part 204, the voltage detection part 205, the multiplier 206 and the accumulator 207 measure the amount of power used by the AC load used by the consumer, and the combining unit 301 sums the amount of power used by the DC load and the amount of power used by the AC load. It is possible to measure the total amount of power used when a consumer uses a DC load, an AC load, or both.

If this embodiment is used, an AC voltage supplied from an external power supply company is converted into a low-level DC voltage and supplied to household appliances. Therefore, the voltage is low, electric leakage is unlikely to occur, and electric shock is also generated. Hateful. It is also possible to simplify household power distribution facilities. Furthermore, the power supply circuit of the electric appliance used at home can be simplified, and a low-cost electric appliance is supplied.

As described above, according to the present invention, electric appliances that can operate at a DC voltage can be supplied with electric power at a low DC voltage. An improved electronic watt-hour meter can be provided.

The internal block diagram which shows the structure of Example 1 of the watt-hour meter by this invention The internal block diagram which shows the structure of Example 2 of the watt-hour meter by this invention The internal block diagram which shows the structure of Example 3 of the watt-hour meter by this invention The figure which shows the attachment state to the consumer of the electricity meter by this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Power meter main body 101 Input terminal part 102 Output terminal part 103 AC / DC conversion part 104 Current detection part 105 Voltage detection part 106 Multiplication part 107 Integration part 108 Display part 200 Wattmeter main body 202 Output terminal part 204 Current detection part 205 Voltage Detection unit 206 Multiplying unit 207 Accumulating unit 208 Display unit 300 Energy meter body 301 Combining unit 302 Display unit

Claims (3)

AC / DC conversion means for converting AC voltage supplied from the outside into DC voltage;
Voltage detection means for detecting the voltage of the DC voltage converted by the AC / DC conversion means;
Current detecting means for detecting a current of a DC voltage converted by the AC / DC converting means;
Power calculating means for multiplying a signal related to the DC voltage detected by the voltage detecting means and a signal related to the DC current detected by the current detecting means to measure the power consumption of the system under measurement;
An watt-hour meter comprising: output means for outputting the power consumption of the system under measurement measured by the power calculation means. AC / DC conversion means for converting AC voltage supplied from the outside into DC voltage;
First voltage detection means for detecting the voltage of the DC voltage converted by the AC / DC conversion means;
First current detection means for detecting a current of a DC voltage converted by the AC / DC conversion means;
A first power calculation for multiplying a signal related to a DC voltage detected by the first voltage detection means and a signal related to a DC current detected by the first current detection means to measure the power consumption of the system under measurement. Means,
First output means for outputting the power consumption of the system under measurement measured by the first power calculation means, and second voltage detection means for detecting the voltage of the AC voltage supplied from the outside,
Second current detection means for detecting a current of an alternating voltage supplied from the outside;
Second power calculation for measuring the power consumption of the system under test by multiplying the signal related to the AC voltage detected by the second voltage detection means and the signal related to the AC current detected by the second current detection means Means,
A watt-hour meter comprising: second output means for outputting the power consumption of the system under measurement measured by the second power calculation means. AC / DC conversion means for converting AC voltage supplied from the outside into DC voltage;
First voltage detection means for detecting the voltage of the DC voltage converted by the AC / DC conversion means;
First current detection means for detecting a current of a DC voltage converted by the AC / DC conversion means;
A first power calculation for multiplying a signal related to a DC voltage detected by the first voltage detection means and a signal related to a DC current detected by the first current detection means to measure the power consumption of the system under measurement. Means,
A second voltage detecting means for detecting the voltage of the AC voltage supplied from the outside;
Second current detection means for detecting a current of an alternating voltage supplied from the outside;
Second power calculation for measuring the power consumption of the system under test by multiplying the signal related to the AC voltage detected by the second voltage detection means and the signal related to the AC current detected by the second current detection means Means,
A summing means for summing the power consumption of the measured system measured by the first power computing means and the power consumption of the measured system measured by the second power computing means;
An watt-hour meter comprising output means for outputting the amount of power used summed by the summing means.

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