TWI546542B - Device and method for measuring the power consumption, device and method for contactless measuring power supply status - Google Patents

Description

Device for measuring power consumption, device and method for measuring non-contact power supply condition

The invention relates to a device and a method for measuring power consumption, and in particular to a device and a method for sensing voltage and current on an AC power supply line in a non-contact manner, thereby measuring power consumption.

The traditional household electric meter is suitable for the accumulation of utility power, and it usually measures the current and voltage directly through the power wire to measure the power. In fact, the electricity calculation is based on real power or active power as the basis for calculation. The real power used to indicate the power consumption is related to the power factor. For resistive loads, the power factor is 1. For non-resistive loads, such as inductive and capacitive loads, the power factor when powering them is not 1. Wire-type measurements yield actual current, actual voltage, and power factors. However, the contact measurement has a measured impedance loss, and there is also a potential danger of leakage, so the design is complicated and the installation is cumbersome.

Also. Current 鉤錶 is the non-contact measurement of the current on the supply line. Compared to contact measurement, it has simple characteristics and avoids the risk of contact leakage. However, with the non-contact measurement of the current 鉤錶, only the energy to the instantaneous current, the simultaneous acquisition of the instantaneous voltage can not obtain the power factor, and because the power factor can not be obtained, the value of the real power cannot be obtained. In other words, in the case where the power factor is not 1, the non-contact measurement of the current 应用 is applied, and the real power cannot be obtained.

Embodiments of the present invention provide a device for measuring power consumption, and a non-contact measurement The device and method for electrical conditions obtain the voltage of the power supply line by measuring the electric field of the power supply line, obtain the current of the power supply line by measuring the magnetic field of the power supply line, and obtain the power factor of the alternating current, thereby obtaining the real power.

The embodiment of the invention provides a device for measuring power consumption, which is used for measuring the real power or the single-phase two-wire 110V delivered by the first live line (L1) and the second live line (L2) of the single-phase three-wire 220V power supply line. The real power transmitted through the live (L) and neutral (N) wires. The device for measuring power consumption includes a detecting unit and a calculating unit, and the calculating unit is electrically connected to the detecting unit, and the calculating unit calculates the phase difference according to the induced voltage signal generated by the detecting unit and the induced current signal to obtain a power factor, and The induced voltage signal, the induced current signal, and the power factor obtain a real power value. The device for measuring power consumption is characterized in that: the detecting unit has an electric field detector and a magnetic field detector, and the detecting unit is disposed adjacent to the first power supply line and the second power supply line, wherein the electric field detector has the first The electrode and the second electrode, the magnetic field detector has a first coil and a second coil respectively matched with the magnetic conductive component. The first electrode and the second electrode are respectively disposed adjacent to the first power supply line and the first power supply line, and the first electrode and the first power supply line cause a first potential on the first electrode according to a capacitive effect, and the second electrode and the second supply The electric wire causes a second potential on the second electrode according to a capacitive effect, and the induced voltage signal is a potential difference between the first potential and the second potential. The first coil and the second coil are respectively disposed adjacent to the first power supply line and the second power supply line, and the winding directions of the first coil and the second coil are opposite, and the first coil and the second coil are coupled in series according to the same induced current direction. Obtaining an induced current signal corresponding to the currents of the first power supply line and the second power supply line, wherein the winding directions are opposite and coupled in series to effectively resist geomagnetism, greatly reducing the difference in geomagnetism in different occasions and affecting the measurement result.

An embodiment of the present invention provides a method for measuring power consumption, which is used for measuring real power transmitted through a first power supply line and a second power supply line. The method includes the following steps. First, the first electrode is The second electrodes are respectively disposed adjacent to the first power supply line and the second power supply line, and the first coil and the second coil are respectively disposed adjacent to the first power supply line and the second power supply line, wherein the first coil and the second coil are wound Line direction anti. Then, a potential difference between the potential of the first electrode and the potential of the second electrode is obtained to generate an induced voltage signal. Then, the first coil and the second coil are coupled in series according to the same induced current direction to obtain an induced current signal corresponding to the currents of the first power supply line and the second power supply line. Then, the phase difference between the induced voltage signal and the induced current signal is used to obtain a power factor, and the computing unit is used to calculate the real power according to the induced voltage signal, the induced current signal, and the power factor.

The embodiment of the present invention provides a non-contact power supply condition detecting device for simultaneously measuring an induced voltage signal and an induced current signal of a power supply line. The power supply line further includes a first power supply line and a second power supply line, and is characterized in that The power supply detecting device is disposed at a specific distance that is not in contact with the power supply line, and has an electric field detector and a magnetic field detector; the electric field detector has a first electrode and a second electrode respectively disposed adjacent to each other at a specific distance In the first power supply line and the second power supply line, the first electrode and the first power supply line cause a first potential on the first electrode according to a capacitive effect, and the second electrode and the second power supply line are on the second electrode according to a capacitive effect a second potential, the potential difference between the first potential and the second potential is an induced voltage signal; wherein the magnetic field detector has a first coil and a second coil respectively disposed at a certain distance adjacent to the first power supply line and the second power supply line a winding direction of the first coil and the second coil is opposite, and the first coil and the second coil are coupled in series according to the same induced current direction to obtain a corresponding Induced current signal line and the second power supply line.

The embodiment of the invention provides a non-contact measuring device for measuring the supply current, which is used for measuring the amount of current transmitted by the power supply line, and the power supply line further comprises a first power supply line and a second power supply line, and the device for measuring the supply current The detecting unit is characterized in that: the detecting unit has a magnetic field detector, wherein the magnetic field detector has a first coil and a second coil; and the first coil and the second coil are respectively disposed adjacent to the first power supply line and a second power supply line, and the winding directions of the first coil and the second coil are opposite, and the first coil and the second coil are coupled in series according to the same induced current direction to obtain a first power supply line and a second power supply line. The induced current signal of the current.

In summary, the embodiments of the present invention provide a device for measuring power consumption, which is not connected. The device and method for measuring the power supply condition by using the two electrodes to sense the voltage change on the power supply line according to the principle of the capacitance effect, and using two coils to sense the current change on the power supply line, after obtaining the current and voltage changes of the power supply line, Comparing the phase difference between the current and the voltage change results in a power factor, so real power can be obtained. Based on this non-contact measurement, the device and method for measuring power consumption do not have the impedance loss of the wire measurement and the complicated and potentially dangerous application procedure, and there is no potential danger of contact leakage.

The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

1‧‧‧Measurement of power consumption

11‧‧‧ electric field detector

12‧‧‧ Magnetic Field Detector

111‧‧‧First electrode

112‧‧‧second electrode

113‧‧‧Voltage signal supply unit

2‧‧‧Computation unit

3‧‧‧Power supply line

SV‧‧‧ induced voltage signal

SI‧‧‧Induction current signal

EF‧‧‧ electric field

MF‧‧‧ magnetic field

V1‧‧‧ first potential

V2‧‧‧second potential

31‧‧‧First power supply line

32‧‧‧second power supply line

+, -‧‧‧Polar

4, 4'‧‧‧ power supply

5, 6‧‧‧ load

121‧‧‧First coil

122‧‧‧second coil

123‧‧‧ Current signal supply unit

M1‧‧‧first magnetic field

M2‧‧‧second magnetic field

D1‧‧‧First induced current direction

D2‧‧‧second induced current direction

I‧‧‧current

13‧‧‧ modules

121M‧‧‧First Permeance Element

122M‧‧‧Second magnetically conductive element

S110, S120, S130, S140‧‧‧ step procedure

L1‧‧‧First FireWire

L2‧‧‧second firewire

G‧‧‧ Grounding

D‧‧‧Specific distance

FIG. 1 is a functional block diagram of an apparatus for measuring power consumption according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of measuring an electric field of a power supply line of an electric field detector of a device for measuring power consumption according to an embodiment of the present invention.

FIG. 3 is a circuit diagram of a magnetic field detector for measuring a power consumption of a power supply line of a device for measuring power consumption according to an embodiment of the present invention.

FIG. 4 is a schematic structural diagram of measuring power consumption of a power supply line by a device for measuring power consumption according to an embodiment of the present invention.

FIG. 5 is a flow chart of a method for measuring power consumption provided by an example of the present invention.

Fig. 6 is a waveform diagram of voltages of a conventional single-phase three-wire power supply line.

FIG. 7 is a schematic diagram of a single-phase three-wire power supply to a load according to another embodiment of the present invention.

FIG. 8 is a schematic diagram of an electric field of a power supply line of an electric field detector of a device for measuring power consumption according to another embodiment of the present invention.

FIG. 9 is a circuit diagram of a magnetic field detector for measuring a power consumption of a power supply line of a device for measuring power consumption according to another embodiment of the present invention.

[Example of device for measuring power consumption and device for measuring non-contact power supply condition]

Please refer to FIG. 1. FIG. 1 is a functional block diagram of an apparatus for measuring power consumption according to an embodiment of the present invention. The device for measuring power consumption in the embodiment is configured to measure the real power transmitted by the power supply line 3 in a non-contact manner, and the power supply line 3 includes at least a first power supply line and a second power supply line. In the present embodiment, the first power supply line and the second power supply line are the live line (L) and the neutral line (N) in the single-phase two-wire 110V power supply line specification, but the present invention is not limited thereto.

The device for measuring power consumption includes a detecting unit 1 and a calculating unit 2, and the calculating unit 2 is electrically connected to the detecting unit 1. The calculating unit 2 obtains a power factor according to the induced voltage signal SV generated by the detecting unit 2 and the induced current signal SI. (PF), and obtains a real power value according to the induced voltage signal SV, the induced current signal SI, and the power factor (PF). The device for measuring power consumption is characterized in that the detecting unit 1 has an electric field detector 11 and a magnetic field detector 12 for setting a live line and a neutral line adjacent to the power supply line 3. The electric field detector 11 detects the electric field EF of the power supply line through the non-contact type, generates an induced voltage signal SV according to the electric field EF, and transmits the induced voltage signal SV to the calculation unit 2. The magnetic field detector 12 detects the magnetic field MF of the power supply line through the non-contact, generates an induced current signal SI according to the magnetic field MF, and transmits the induced current signal SI to the calculation unit 2. The computing unit 2 can provide a function of computing the induced voltage signal SV and the induced current signal SI, and storing corresponding parameters or a look-up table (LUT). The calculation unit 2 is, for example, a microprocessor (MCU), but the present invention is not limited thereto. In an embodiment, the computing unit 2 can use the sampling mechanism to convert the induced voltage signal SV and the induced current signal SI of the analogy to the digital signal for digital calculation and recording. However, the present invention is not limited thereto. For the electric field detector 11 and the magnetic field detector 12, refer to the description corresponding to FIGS. 2 and 3, respectively.

2 is a schematic diagram of measuring the electric field of the power supply line of the electric field detector of the device for measuring power consumption according to the embodiment of the present invention. In FIG. 2, the power supply line is represented by a cross section of the first power supply line 31 and the second power supply line 32. Electric field detector The first electrode 111 and the second electrode 112 are provided. The first electrode 111 and the first power supply line 31 (for example, a hot line) cause a first potential V1 on the first electrode 111 according to a capacitive effect, and the second electrode 112 and the second electrode The wire 32 (e.g., a neutral wire) causes a second potential V2 on the second electrode 112 in accordance with a capacitive effect. The induced voltage signal SV in FIG. 2 represents a potential difference (V1 - V2) between the first potential V1 and the second potential V2. The voltage signal supply unit 113 obtains a potential difference (V1 - V2) between the first potential V1 and the second potential V2 to generate an induced voltage signal SV. The voltage signal supply unit 113 includes, for example, at least a voltmeter. However, in actual application, in order to provide the induced voltage signal SV to the computing unit 2 of FIG. 1, the voltage signal providing unit 113 can further convert the induced voltage signal SV into a signal suitable for the calculation unit 2, and the present invention does not limit the sensing. The implementation of the voltage signal SV.

Then, in this embodiment, the first power supply line 31 may also be a neutral line (N), and correspondingly the second power supply line 32 is a hot line (L), and the first power supply line 31 and the second power supply line 32 are The fire line (L) which is the neutral line (N) does not affect the operation of the electric field detector, and the electric field induction principle of the first electrode 111 and the second electrode 112. That is, the relationship between the first electrode 111 and the second electrode 112 of the present embodiment with respect to the two power lines can be exchanged, except for the polarity of the potential difference measured by the voltage signal supply unit 113 (+ polarity as shown in FIG. 2). It may be the opposite of -polar. However, based on the principle of alternating current, it can be known that the potential difference (V1-V2) of the first power supply line 31 and the second power supply line 32 changes periodically, and the polarity of the potential difference (V1-V2) also alternates. Therefore, in practical applications, the polarity of the potential difference (V1-V2) also alternates periodically with time. In general, the voltage of the supply line is a function of time, such as Vm*sin(ωt+θ1), Vm is the maximum value of the voltage, is the frequency of the ω alternating current, θ1 is the voltage phase, and t is the time. The first potential V1 and the second potential V2 are potentials established on the first power supply line 31 and the second power supply line 32 in response to the voltage Vm*sin(ωt+θ1) of the alternating current, and therefore, the potential difference (V1-V2) The phase should correspond to the phase θ1 of the voltage.

Next, please refer to FIG. 3. FIG. 3 is a circuit diagram of a magnetic field detector for measuring a power consumption of the power supply line of the apparatus for measuring power consumption according to an embodiment of the present invention. Power supply 4 utilizes first The power supply line 31 and the second power supply line 32 transmit power to the load 5. The magnetic field detector has a first coil 121 and a second coil 122, and the first coil 121 and the second coil 122 are respectively disposed adjacent to the first power supply line 31 (eg, the hot line (L)) and the second power supply line (eg, the neutral line) (N)) 32, the winding directions of the first coil 121 and the second coil 122 are opposite, and the first coil 121 and the second coil 122 are coupled in series according to the same induced current direction to obtain a line corresponding to the hot line and the neutral line. The induced current signal SI of the current. In the present embodiment, the induced current signal SI is the induced current generated by the first coil 121 and the first coil 122 being affected by the change of the magnetic field of the power supply lines 31, 32 in FIG.

In detail, in the example of FIG. 3, if the first coil 121 is wound clockwise, the second coil 122 is wound counterclockwise, so that in the case of the same magnetic field direction, the first coil 121 and The induced current of the second coil 122 is opposite in direction. The first coil 121 is configured to sense the first magnetic field M1 generated by the current I of the first power supply line 31 (eg, the hot line (L)) to obtain the first induced current direction D1. The first coil 121 is configured to sense a second magnetic field M2 generated by the current I of the second power supply line 32 (eg, the neutral line (N)) to obtain a second induced current direction D2, wherein the direction of the first magnetic field M1 is opposite to the first In the direction of the two magnetic fields M2, the first induced current direction D1 is the same as the second induced current direction D2. In short, the first induced current direction D1 of the first coil 121 and the second induced current direction of the second coil 122 are based on the direction in which the current direction of the first power supply line 31 is opposite to the direction of the current I of the second power supply line 32. D2 is the same. That is to say, by using the first coil 121 and the second coil 122 coupled in series according to the same induced current direction (D1 and D2), the induced current signal SI corresponding to the current I of the live line and the neutral line can be simultaneously obtained.

In addition, in FIG. 3, the magnetic field detector further includes a current signal supply unit 123 in addition to the first coil 121 and the second coil 122. The current signal supply unit 123 is configured to generate an induced current signal SI according to the current flowing through the first coil 121 and the second coil 122. The current signal supply unit 123 is, for example, an ammeter. The current signal providing unit 123 is configured to convert the induced current signal SI into a signal suitable for receiving by the computing unit 2 of FIG. However, the present invention does not limit the actuality of the current signal supply unit 123. Present mode.

Furthermore, when considering the phase of the induced current signal SI, the phase of the induced current of the first coil 121 and the second coil 122 should correspond to the phase of the current I carried on the first power supply line 31 and the second power supply line 32 ( The hysteresis effect is ignored here). For example, current I is expressed as Im*sin(ωt+θ2), Im is the maximum value of current, is the frequency of ω alternating current, θ2 is the current phase, and t is time. Therefore, the phase of the induced current of the first coil 121 and the second coil 122 should correspond to the phase θ2 of the current I.

Further, since the winding directions of the first coil 121 and the second coil 122 are opposite, the induced currents excited by the first coil 121 and the second coil 122 are opposite to each other and cancel each other in the same magnetic field environment. For example, when geomagnetism or external magnetic field interference exists, the first coil 121 and the second coil 122 coupled in series in such a manner can resist the influence or interference of the environmental or external magnetic field on the detection result. Therefore, the design of the first coil 121 and the second coil 122 of the present embodiment can obtain more accurate measurement results.

Next, regarding the power factor, when the load 5 is not a purely resistive load, the phase θ1 of the voltage will be different from the phase θ2 of the current. According to this, when the phase of the induced voltage signal SV and the phase of the induced current signal SI are obtained, the phase difference between the voltage and the current of the power supply line can be obtained, and the power factor is obtained accordingly. In short, the cosine value (Cos(θ1-θ2)) of the phase difference between the induced voltage signal SV and the induced current signal SI (which can be regarded as the difference between the phase θ1 and the phase θ2) is the power factor (PF). The power corresponds to the product of the induced voltage signal SV, the induced current signal SI, and the power factor (PF). Although the induced voltage signal SV and the induced current signal SI are inductive signals, and the absolute values of the voltage and current signal magnitudes on the power supply line are different, the real value of the real power is compared with the induced voltage signal SV, the induced current signal SI, and the power factor. The difference in the product of (PF) is only a proportionality constant, so that the true value of the real power can be easily obtained by simply passing through the calibration procedure. It is only necessary to perform a calibration before using this device that measures the power consumption. Even if the relative position of the device for measuring the power consumption relative to the power supply line 3 (including the first power supply line 31 and the second power supply line 32) does not change, the correct consumption can be maintained. Battery detection.

In practice, the computing unit 2 can compare the induced voltage signal SV and the induced current signal SI with a look-up table (LUT) to correct the real power value. In the calibration procedure, the device for measuring the power consumption is first positioned in the vicinity of the power line according to the foregoing manner, and then measured with a standard contact wire power measuring device, and then the measurement of the embodiment is Measure the value of the real power obtained by the device that measures the power consumption to obtain the relevant correction parameters such as the proportional parameter, and measure the power under various power levels, and establish a lookup table to make the measurement power consumption The quantity of the device can obtain accurate real power values through the previously determined look-up table with simple calculations during normal operation.

Referring to FIG. 4, FIG. 4 is a schematic structural diagram of measuring power consumption of a power supply line by a device for measuring power consumption according to an embodiment of the present invention. The first electrode 111 and the second electrode 112 are disposed adjacent to the first power supply line 31 and the second power supply line 32 of the two-wire power supply line 3, respectively. The first coil 121 and the second coil 122 are also disposed adjacent to the first power supply line 31 and the second power supply line 32 of the two-wire power supply line 3, respectively.

In practice, for ease of use, the electric field detector 11 (including the first electrode 111 and the second electrode 112) and the magnetic field detector 12 (including the first coil 121 and the second coil 122) are integrated into the same module. 13. In this manner, the module 13 including the first electrode 111, the second electrode 112, the first coil 121, and the second coil 122 is disposed adjacent to the first power supply line 31 and the second power supply line 32, and is measured. With the correcting means, that is, the correct power consumption can be calculated.

In FIG. 4, the first electrode 111 is disposed between the first power supply line 31 and the first coil 121, but the present invention is not limited thereto. The second electrode 112 is disposed between the second power supply line 32 and the second coil 122, but the present invention is not limited thereto. Basically, the relative positions of the two electrodes (the first electrode 111 and the second electrode 112) with respect to the two coils (the first coil 121 and the second coil 122) do not affect the result of the detection. Because the first electrode 111 and the second electrode 112 are related to electric field detection (affected by the variable voltage (or potential) of the first power supply line 31 and the second power supply line 32 of the power supply line 3). and Moreover, the first coil 121 and the second coil 122 are related to magnetic field detection, which are affected by the currents of the first power supply line 31 and the second power supply line 32 of the power supply line 3, and it is particularly noted here that the first coil 121 and The winding direction of the second coil 122 is opposite, and the first coil 121 and the second coil 122 are coupled in series according to the same induced current direction to obtain an induced current signal SI corresponding to the current of the live line and the neutral line.

Based on the description of FIG. 2 to FIG. 4, the electric field detector 11 and the magnetic field detector 12 of the detecting unit 1 are disposed at a specific distance D that is not in contact with the power supply line 3, for example, the specific distance D is a quantity. The shortest distance from the power supply line to the detection unit 1 is greater than 15 mm.

In FIG. 4, the magnetic field detector 12 further includes a first magnetic conductive element 121M and a second magnetic conductive element 122M. The first coil 121 is wound around the first magnetic conductive element 121M, and the second coil 122 is wound around the second magnetic Conductor element 122M. The magnetically permeable element is typically a silicon steel sheet or iron oxide or magnet, usually referred to as a core, to help the coil concentrate the magnetic lines of force. The present invention does not limit the shape of the magnetic conducting element, and those skilled in the art should be able to easily understand the implementation of the magnetic conducting element, and will not be described again.

[Embodiment of Method for Measuring Power Consumption]

Please refer to FIG. 5. FIG. 5 is a flowchart of a method for measuring power consumption provided by an example of the present invention. The method of measuring the power consumption is used to measure the real power transmitted through the first power supply line and the second power supply line, which can be applied to the apparatus for measuring the power consumption of the previous embodiment. This method includes the following steps. First, in step S110, the first electrode (111) and the second electrode (112) are respectively disposed adjacent to the first power supply line and the second power supply line, and the first coil (121) and the second coil (122) The first power supply line and the second power supply line are respectively disposed adjacent to each other, wherein the winding directions of the first coil (121) and the second coil (122) are opposite. In an embodiment, referring to FIG. 3, in comparison with step S110, the first coil (121) is configured to sense a first magnetic field (M1) generated by a current of the first power supply line to obtain a first induced current. Direction (D1), the second coil (122) is configured to sense a second magnetic field (M2) generated by a current of the second power supply line to obtain a second induced current direction (D2), wherein the first magnetic field (M1) has the opposite direction In the direction of the second magnetic field (M2), the first induction The current direction (D1) is the same as the second induced current direction (D1). In addition, in practice, the step S110 may further include: the first coil (121) is wound around the first magnetic conductive element (121M), and the second coil (122) is wound around the second magnetic conductive element (122M). Figure 4 of the previous embodiment is shown.

Then, in step S120, a potential difference between the potential of the first electrode (111) and the potential of the second electrode (112) is obtained to generate an induced voltage signal (SV). Next, in step S130, the first coil (121) and the second coil (122) are coupled in series according to the same induced current direction to obtain an induced current signal corresponding to the currents of the first power supply line and the second power supply line. (SI).

Then, in step S140, a phase difference between the induced voltage signal (SV) and the induced current signal (SI) is calculated to obtain a power factor (PF), and the calculating unit (2) is used according to the induced voltage signal (SV), The induced current signal (SI) and the power factor (PF) are calculated to obtain real power. In the step of obtaining real power (S140), the cosine of the phase difference between the induced voltage signal (SV) and the induced current signal (SI) is a power factor (PF), and the calculating unit (2) will induce the voltage signal ( SV), the induced current signal (SI) is multiplied by the power factor (PF) to obtain real power. In addition, when the apparatus for measuring the power consumption is used for the first time, the following steps may be further included after the step S140, and the calculating unit (2) compares the induced voltage signal (SV) and the induced current signal (SI) with the lookup table ( LUT) to correct for real power values.

[Another embodiment of a device for measuring power consumption and a device for measuring non-contact power supply conditions]

Referring to FIG. 1 again, in the embodiment, the power supply line 3 is changed to a single-phase three-wire 220V power supply line specification, and the power supply line 3 includes a first power supply line, a second power supply line, and a ground line (G). The electric wire and the second power supply line are the first live line (L1) and the second live line (L2) of the single-phase three-wire 220V power supply line, respectively. Referring to FIG. 6, the single-phase three-wire 220V has two live wires with a difference of 180 degrees, which can be regarded as a single-phase two-wire with a current direction due to the loop structure. The effect of one-in-one-out is as shown in FIG.

Next, referring to FIG. 8, similar to the embodiment of FIG. 2, the electric field detector 11 The first electrode 111 and the first power supply line (the first live line L1) cause a first potential V1 on the first electrode 111 according to the capacitive effect, and the second electrode 112 and the second power supply line 32 (the second live line L2) are based on the capacitance. The effect causes a second potential V2 on the second electrode 112. The induced voltage signal SV in FIG. 8 represents a potential difference (V1 - V2) between the first potential V1 and the second potential V2.

Next, referring to Fig. 9, similar to the embodiment of Fig. 3, the power source 4' transmits power to the load 6 using the first power supply line (first live line L1) and the second power supply line (second live line L2). The magnetic field detector 12 has a first coil 121 and a second coil 122. The first coil 121 and the second coil 122 are respectively disposed adjacent to the first power supply line (the first live line L1) and the second power supply line (the second live line L2). The winding directions of the first coil 121 and the second coil 122 are opposite, and the first coil 121 and the second coil 122 are coupled in series according to the same induced current direction to obtain currents corresponding to the first live line L1 and the second live line L2. The induced current signal SI.

Then, the computing unit 2 of FIG. 1 can use the sampling mechanism to convert the induced voltage signal SV and the induced current signal SI, which are analogous to the detecting unit 1, into digital signals for digital calculation and recording. For the contents of the induced voltage signal SV and the induced current signal SI, and the manner of calculating the processing thereof, please refer to the description of the previous embodiment, and details are not described herein again.

[Possible effects of the examples]

In summary, the apparatus and method for measuring power consumption provided by the embodiments of the present invention utilize two electrodes to induce a voltage change on a power supply line according to a principle of a capacitive effect, and use two coils to sense a current change on a power supply line. The power factor is obtained after the current and voltage changes of the power supply line are obtained, so that real power can be obtained. The detecting unit of the device for measuring the power consumption can be arranged in a modular form adjacent to the power supply line to be measured. Based on this non-contact measurement, the device and method for measuring power consumption have no wire-measurement impedance loss and no potential danger of contact leakage.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

1‧‧‧Measurement of power consumption

11‧‧‧ electric field detector

12‧‧‧ Magnetic Field Detector

2‧‧‧Computation unit

3‧‧‧Power supply line

SV‧‧‧ induced voltage signal

SI‧‧‧Induction current signal

EF‧‧‧ electric field

MF‧‧‧ magnetic field

Claims (15)

A device for measuring power consumption for measuring a real power transmitted by a power supply line, the power supply line further comprising a first power supply line and a second power supply line, and the device for measuring power consumption includes a detect a measuring unit and a computing unit, the computing unit is electrically connected to the detecting unit, and the calculating unit obtains a power factor according to an induced voltage signal generated by the detecting unit and an induced current signal, and according to the induced voltage signal, The sensing current unit and the power factor obtain the real power, wherein the detecting unit has an electric field detector and a magnetic field detector for setting adjacent to the first power supply line and the second power supply line, The electric field detector has a first electrode and a second electrode. The magnetic field detector has a first coil and a second coil. The first electrode and the second electrode are respectively disposed adjacent to the first electrode. And the first power supply line and the first power supply line cause a first potential on the first electrode according to a capacitive effect, and the second electrode and the second power supply line are based on a capacitance effect A second potential is generated on the second electrode, the induced voltage signal is a potential difference between the first potential and the second potential; wherein the first coil and the second coil are respectively disposed adjacent to the first power supply line The second power supply line is opposite to the winding direction of the second coil, and the first coil and the second coil are coupled in series according to the same induced current direction to obtain a corresponding corresponding to the first power supply line The induced current signal of the current of the second power supply line. The device for measuring power consumption according to the quantity of claim 1 , wherein a cosine of a phase difference between the induced voltage signal and the induced current signal is a power factor, and the real power corresponds to the induced voltage signal, the sensing The product of the current signal and the power factor. The device for measuring the power consumption according to the first item of claim 1, wherein the magnetic field detector further comprises a first magnetic conductive component and a second magnetic conductive component, wherein the first magnetic coil is wound around the first magnetic conductive component The second coil is wound around the second magnetically permeable element. The device for measuring the power consumption according to the quantity of the first item of the claim, wherein the first coil is configured to sense a first magnetic field generated by the current of the first power supply line to obtain a first induction a direction of the current, the second coil is configured to sense a second magnetic field generated by the current of the second power supply line to obtain a second induced current direction, wherein the direction of the first magnetic field is opposite to the direction of the second magnetic field, The first induced current direction is the same as the second induced current direction. The device for measuring power consumption according to the quantity of claim 1 , wherein the calculating unit compares the induced voltage signal and the induced current signal to a lookup table to correct the real power value. A method for measuring power consumption for measuring a real power transmitted by a first power supply line and a second power supply line of a power supply line, wherein the method comprises: combining a first electrode and a second The electrodes are respectively disposed adjacent to the first power supply line and the second power supply line, and a first coil and a second coil are respectively disposed adjacent to the first power supply line and the second power supply line, wherein the first coil is The winding direction of the second coil is opposite; a potential difference between the potential of the first electrode and the potential of the second electrode is obtained to generate an induced voltage signal; the first coil and the second coil are connected in series according to the same induced current direction Coupling to obtain an induced current signal corresponding to currents of the first power supply line and the second power supply line; and obtaining a power factor according to a phase difference between the induced voltage signal and the induced current signal, and utilizing A computing unit calculates the real power according to the induced voltage signal, the induced current signal, and the power factor. The method for measuring power consumption according to the item of claim 6, wherein in the step of obtaining the real power, a cosine value of a phase difference between the induced voltage signal and the induced current signal is a power factor, and the calculating unit The induced voltage signal, the induced current signal is multiplied by the power factor to obtain the real power. The method for measuring power consumption according to item 6 of the request includes: The computing unit compares the induced voltage signal and the induced current signal to a lookup table to correct the real power value. The method for measuring power consumption according to the item of claim 6, wherein the first coil and the second coil are respectively disposed adjacent to the first power supply line and the second power supply line, the first The coil is configured to sense a first magnetic field generated by the current of the first power supply line to obtain a first induced current direction, and the second coil is configured to sense a second magnetic field generated by the current of the second power supply line. a second induced current direction, wherein the direction of the first magnetic field is opposite to the direction of the second magnetic field, and the first induced current direction is the same as the second induced current direction. The method for measuring the power consumption according to the quantity of the sixth item of the claim, the step of respectively setting the first coil and the second coil adjacent to the first power supply line and the second power supply line further comprises: making the first The coil is wound around a first magnetically conductive element, and the second coil is wound around a second magnetically conductive element. A non-contact power supply condition detecting device for simultaneously measuring an induced voltage signal and an induced current signal of a power supply line, the power supply line further comprising a first power supply line and a second power supply line, wherein the power supply The condition detecting device is disposed at a position that is not in contact with the power supply line by a certain distance, and has an electric field detector and a magnetic field detector; the electric field detector has a first electrode and a second electrode respectively The specific distance is disposed adjacent to the first power supply line and the second power supply line, and the first electrode and the first power supply line generate a first potential on the first electrode according to a capacitive effect, the second electrode and the second electrode The second power supply line generates a second potential on the second electrode according to the capacitive effect, and the potential difference between the first potential and the second potential is the induced voltage signal; wherein the magnetic field detector has a first coil and a second coil is respectively disposed adjacent to the first power supply line and the second power supply line at the specific distance, and the winding direction of the first coil and the second coil is opposite, the first coil and the first coil Second coil induced current according to the same direction are coupled in series, to obtain a corresponding to the first power supply line and the second power supply line induced current signal. According to the non-contact power supply condition detecting device of claim 11, the first coil is wound around a first magnetic conducting element, and the second coil is wound around a second magnetic conducting element. The non-contact power supply condition detecting device of claim 11, wherein the specific distance is the shortest distance of the power supply line to the non-contact power supply detecting device is greater than 15 mm. A non-contact device for measuring a supply current for measuring a quantity of current transmitted by a power supply line, the power supply line further comprising a first power supply line and a second power supply line, and the device for measuring the supply current includes a detect The detecting unit is characterized in that: the detecting unit has a magnetic field detector, wherein the magnetic field detector has a first coil and a second coil; and the first coil and the second coil are respectively disposed adjacent to the The first power supply line and the second power supply line are opposite to each other, and the first coil and the second coil are coupled in series according to the same induced current direction to obtain a corresponding An induced current signal of the current of the first power supply line and the second power supply line. The device for measuring the supply current according to the non-contact type of claim 14, wherein the first coil is wound around a first magnetically conductive element, and the second coil is wound around a second magnetically conductive element.