JP3201066B2 - Power measurement system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power measuring system provided with a power detector suitable for power survey for energy saving.

[0002]

2. Description of the Related Art Energy saving has been called for from the viewpoint of the power situation, and it is necessary to check the power consumption status online as a countermeasure. To check the power situation online, you need to check the power consumption of each device individually.
In order to measure the power for this purpose, conventionally, means as shown in FIGS. 5 and 6 have been used. That is, in FIG. 5, reference numeral 11 denotes a wattmeter, which has a voltage input terminal v and a current input terminal i. A load 12 is supplied with commercial power from a power outlet 13 via power lines 14 and 15. The current input terminal i of the power meter 11 is connected in the middle of the power supply line 14, and the voltage input terminal v is connected in parallel between the power supply lines 14 and 15. The voltage and current applied from terminals v and i are
The power consumed by the load 12 is calculated by multiplying by one. The system shown in FIG. 5 is most common for power measurement, but must be cut off once to connect the power supply line 14 to the current input terminal i of the power meter 12, the connection is complicated, and a large number of loads are required. Power cannot be measured at the same time, it is difficult to take a management system in steady operation, data processing is extremely complicated, and it is not suitable for long-term data recording. There are problems such as.

On the other hand, the system shown in FIG. 6 detects the current supplied to the load 12 by clipping the power supply line 14 by using a clip type current transformer 16, and also clips the lines 14 and 15 at 17 and 18. Thus, the voltage is detected. The system of FIG. 6 eliminates the trouble of disconnecting the power supply line as shown in FIG. 5 and can measure the power as it is in a live state. However, similarly to the system of FIG. 4, the power of many loads is measured at the same time. There is a problem that it cannot be performed, and the above-mentioned problems (1) and (2) follow.

In any case, the power system has recently become complicated, and the conventional power measurement method shown in FIGS. 5 and 6 cannot actually cope with a large amount of load in an energy saving survey. is there. In particular, when investigating the situation of power consumption for each floor of a building, when many office equipment such as personal computers or workstations are used, each equipment is connected in a complicated manner. Therefore, there is a problem that the conventional measurement methods shown in FIGS. 5 and 6 are specialized and too complicated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the connection of individual loads is extremely simple, and the power consumption of many loads can be measured online. It is an object of the present invention to provide a power measurement system that can perform the measurement.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a commercial power supply.
The plug inserted into the outlet and the
And a transmitting antenna to supply power to the load.
Digitize the voltage and current or current values respectively
Multiple power detectors that transmit by radio waves from the antenna
Detects whether the load is actually being operated by a human.
Detector that transmits the information of the
Antenna for receiving radio waves transmitted by
The voltage and current or power received by the receiving antenna
The amount of power consumed by the load is calculated based on the flow information.
Calculation, and the load is actually operated by humans.
Receiving device for detecting whether or not
It is composed of a computer connected to the device and performing data processing .

[0007]

According to the present invention, the values of the voltage and current supplied to the load are transmitted to the receiving side by radio waves, and the receiving side receives various information on the power and power consumed by the load based on the received voltage and current information. Find the quantity online.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a configuration diagram of an embodiment of a power measurement system according to the present invention. In the figure, reference numerals 21 and 22 denote outlets of a commercial power supply, and 31 and 32 denote power detectors (hereinafter simply referred to as detectors).
2a, plugs 31b, 32b and transmitting antenna 31
c, 32c. Plugs 31b, 3 of both detectors
2b is used by being inserted into the power outlets 21 and 22, respectively. Details of the detectors 31 and 32 will be described later.

Reference numerals 41 and 42 denote loads (electrical devices such as a personal computer or a work station), which are provided with power plugs 41a and 42a, respectively. This power plug 41a,
42a is connected to the outlets 31a, 3 of the detectors 31, 32.
2a, the commercial power outlet 21,
The commercial power is supplied to these devices 41 and 42 via the power detector 22 and the power detectors 31 and 32 to operate. As a result, the transmitting antennas 31c, 32 of the detectors 31, 32,
“c” transmits the values of the voltage and current applied to the loads 41 and 42 as radio waves. The content of this transmission radio wave is, for example, 25
It has a low power of 0 MHz, 10 mW, FSK system, etc., conforming to mobile communication.

Reference numeral 50 denotes a receiving device, and the detectors 31, 32
, An antenna 51 for receiving radio waves transmitted from the transmitting antennas 31c and 32c,
An interface of a start-stop synchronization system based on the S-232C standard is provided. The receiving device 50 calculates various power amounts (voltage, current, power, power amount, power factor, frequency, charge, etc.) consumed by the loads 41 and 42 from the information received by the antenna 51, and calculates the values. It has a function of displaying, taking out the data from the connector 52 via the interface, and outputting the data to a computer (personal computer) described later.

Reference numeral 60 denotes the personal computer.
A desk 61, a keyboard 62, and a CRT 63 are provided. The personal computer 60 includes standard software for data processing, and displays, for example, power data consumed for each floor from data obtained by the receiving device 50.

When the loads 41 and 42 are personal computers, word processors, or the like, there are times when the power is turned on and those that are actually used by humans and times when they are not used. If the power is not turned on and the operation is not actually performed, the power is wasted, which is against energy saving. Reference numerals 71 and 72 denote detectors for detecting that the loads 41 and 42 are being used by humans, and include sensors 71a and 72a and antennas 71b and 72b, respectively. These detectors 71, 7
2 is provided for each of the loads 41 and 42 as needed.

FIG. 2 shows the power detector 3 used in FIG.
1 is a specific circuit configuration diagram. In the figure, 31a is the load outlet shown in FIG.
1c is a transmitting antenna, which is connected to the load outlet 31a as shown in FIG.
Is connected, and the plug 31b is inserted into the commercial power outlet 21. Reference numeral 31d denotes an analog / digital converter (hereinafter, referred to as an A / D converter), and 31e denotes a known frequency shift keying circuit (FSK modulation circuit) to which the transmitting antenna 31c is connected. 31f is a resistor for detecting the voltage supplied to the load, 31g is a resistor for similarly detecting the current, and the resistor 31f is connected in parallel to the lines 14 and 15 connecting the load outlet 31a and the plug 31b.
The resistor 31g is connected to the line 14 in series. The voltage dividing point of the resistor 31f is connected to the voltage input terminal v of the A / D converter 31d, one end of the resistor 31g is connected to the current input terminal i, and
The connection points of 1f and 31g are respectively connected to the common terminal COM.

Reference numeral 31h denotes a transformer whose primary coil is connected between the power supply lines 14 and 15, and whose secondary coil is a rectifier circuit 3.
1j. The output of the rectifier circuit 31j is connected as a power supply voltage to each power supply terminal of the A / D converter 31d and the FSK modulation circuit 31e. The power detector 31 composed of these components is integrated in a case as one unit as shown in FIG. The antenna 31c is arranged in the case so as not to go out.

The detector 32 shown in FIG. 1 has exactly the same configuration as the detector 31. Note that a large number (for example, 64 or 128) of such detectors are prepared, and the radio wave oscillated by each detector is sequentially received by the receiving device 50 for each channel. The operation of the system of FIG. 1 having the detectors 31 and 32 having such a configuration will be described below.

After the plug 31b of the detector 31 is inserted into the power outlet 21, the outlet 31
The plug 41a of the load 41 is inserted into a. This allows
The load 41 is supplied with commercial power from the power outlet 21 via the detector 31 and enters an operating state. On the other hand, transformer 3
The commercial power detected at 1h is rectified by the rectifier circuit 31j, and the rectified output is used as a DC power by the A / D converter 31d.
And the FSK modulation circuit 31e, and the detector 31 is activated.

When the detector 31 enters the operating state,
The AC voltage v and the current i applied to the load 41 are equal to the resistance 31f.
And 31g respectively, and A / D converter 31d
To be sampled and converted into a digital signal as shown in FIG. In the embodiment, the voltage v and the current i are both A / D converted at (12 bits, 15 data) / cycle. Each data of the voltage v and the current i converted into the digital signal is applied to the FSK modulation circuit 31e and is modulated into an FSK signal, respectively, and then transmitted through the antenna 31c. In this case, each data of the voltage v and the current i may be transmitted simultaneously using two channels, and v0, i0, v1, i1, v
, I2,..., And the voltage v
And the data of the current i.

The voltage v transmitted via the antenna 31c
And a radio wave corresponding to the value of the current i is received by the antenna 51 of the receiving device 50. The received radio wave is synchronized with the transmitting side, and the above-mentioned various electric power amounts consumed by the load 41 are calculated online on the basis of the received radio wave.

Similarly, voltage v and current i consumed by detector 32 at load 42 connected thereto are FSK modulated. The signal modulated into the FSK signal is the antenna 32c
And the transmitted radio wave is received by the antenna 51,
Various amounts of power consumed by the load 42 in the receiving device 50 are calculated. The number of detectors is not limited to two as described above. For example, 128 detectors are provided, and an address is determined for each detector. The 128 detectors are simultaneously set in a measurement state, and the receiving device 50 selects a necessary portion according to an address and performs measurement.

The receiving device 50 obtains various amounts of power consumed by the loads 41 and 42 from the received information by calculation, and the various amounts of power are provided to the personal computer 60 in the personal computer 60 via the connector 52. The desired data processing is performed on-line by the software and displayed or printed.

The detectors 71 and 72 detect data on whether or not the loads 41 and 42 are actually used by humans, together with various amounts of power consumed by the loads 41 and 42, respectively. Antenna 71b, 72b
Sent via The information is detected by the receiving device 50, and the correspondence with the loads 41 and 42 is determined from the address, and it is determined whether or not the load is actually used by a human.

FIG. 3 is a block diagram showing another embodiment of the detector 31. As shown in FIG. In the detector shown in FIG. 2, a resistor 31g is used for current detection, but in FIG. 3, a current transformer is used for current detection. 31k is the current transformer, which clips the line 14 at the primary winding, takes out the current detected at the secondary winding via the resistor 31m, and extracts the current from the A / D converter 31
This is added to the current input terminal i of d.
Further, in the description of the above-described embodiment, the case where both the voltage and the current applied to the load are transmitted has been described. However, when the load is a small scale such as only OA equipment, only the current information is transmitted by radio waves, and the voltage is The receiver may be used.

As described above, according to the present invention, the load to be measured only needs to be plugged into the outlet, and there is no disconnection of the electric wire or any complicated wiring connection for power measurement, and the load is consumed by many loads. Power can be measured online at the same time. Since the received data is processed by a personal computer, desired processed data can be easily obtained. Note that the detectors 31 and 32 are always supplied with a commercial power supply, but the power consumed here is about 0.5 W, and even if they are left unplugged for one year, the power fee is at most 100 yen or less.

According to the present invention, the power consumption of a large number of loads can be measured online by extremely simple means,
It is possible to obtain a power measurement system that matches the era of energy saving measures.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a system according to the present invention.

FIG. 2 is a circuit configuration diagram of an embodiment of a power detector used in the system of FIG. 1;

FIG. 3 is a circuit configuration diagram of another embodiment of the power detector used in the system of FIG. 1;

FIG. 4 is a waveform chart for explaining the operation of the system of FIG. 1;

FIG. 5 is a circuit configuration diagram of an example of a conventional power detector.

FIG. 6 is a circuit configuration diagram of another example of the conventional power detector.

[Explanation of symbols]

 21, 22 Commercial power outlets 31, 32 Power detectors 31a, 32a Load outlets 31c, 32c Transmitting antennas 41, 42 Load 50 Receiving device 51 Receiving antenna 60 Computer

Claims (2)

(57) [Claims] An antenna for transmitting power, comprising: a plug inserted into an outlet for a commercial power supply; an outlet to which a load is connected; and a transmitting antenna. A plurality of power detectors that transmit by radio waves, a detector that detects whether the load is actually operated by a human, and transmits the information from an antenna, and a reception that receives radio waves transmitted by both antennas Antenna for calculating the amount of power consumed by the load based on the information on the voltage and current or the current received by the receiving antenna, and determining whether the load is actually operated by a human. A power measurement system comprising: a receiving device that detects information as to whether the data is received; and a computer that is connected to the receiving device and performs data processing. Wherein said computer power measuring system according to claim 1, characterized in that it is a personal computer.