KR101740861B1 - Self-Powering Smart Current Sensor - Google Patents

Abstract

The present invention relates to a powerless smart electrical current sensor. A power source supplied to a smart electrical current sensor can have an autonomous generation method replaced from a conventional buried battery or external common power source method, and an operation lifespan of a smart sensor is semi-permanently improved. A sensor and a power supply device can be integrated. The powerless smart electrical current sensor according to an aspect of the present invention comprises: a converter including a primary wire, a secondary wire, and a core, wherein the secondary wire includes a first wire having relatively more number of turns than the number of turns of the primary wire and a second wire having relatively less number of turns than the primary wire; a switching unit for switching a first output and a second output respectively outputted from each of the first wire and the second wire; a signal treating unit for generating a measurement signal for measuring an electrical current value or an electrical current waveform of the primary wire on the basis of the first output inputted by being switched through the switching unit; a charging and discharging control unit for controlling charging and discharging of a battery on the basis of the second output inputted by being switched through the switching unit; and a main control unit for integrally controlling the structure of the smart electrical current sensor, and inputting the measurement signal to be treated according to a predetermined algorithm.

Description

[0001] Self-Powering Smart Current Sensor [0002]

The present invention relates to a self-powered smart current sensor that can be operated independently from an external power source by replacing a power source supplied to a smart current sensor with a built-in battery or an external commercial power source.

In general, IoT (Internet of Things) is a new business that can create various solutions as shown in FIG. 1 by intelligent technologies and services that connect all objects by internet and communicate information between people, objects, Field.

Core technologies such as smart sensor technology, wireless communication technology, information communication technology, and application software technology are needed to provide various IoT services.

Here, smart sensor refers to a high-performance, high-precision, high-convenience, high value-added sensor that performs data processing, automatic correction, self-diagnosis, and decision making by combining logic, decision and communication functions with existing sensors.

Conventional power technology related to smart sensor mainly uses ① external power supply device (commercial power or large capacity battery) method and ② internal battery use method for sensing and wireless communication. The above-mentioned method (1) is complicated in the field, is difficult to change its position after installation, and has low flexibility such as expansion of a wireless sensor system. In the case of the above-mentioned method (2), it is possible to manufacture a smart sensor by using the built-in battery, but it is impossible to implement a product having a long operating life due to the restriction of the battery capacity due to the limitation of the product size. It is troublesome to replace the battery.

(3) a method of generating power using energy existing in the installation environment of the smart sensor and supplying power to the object by applying technologies such as Electrodynamic, Small-size Photovoltaic, Thermoelectric, and Piezoelectric However, it is difficult to secure system operation safety and reliability because the environment of the installation site is not always constant.

Particularly, in the case of the conventional smart current sensor, since the sensing current of the sensor (which can be used as the energy present in the installation environment) is a very small current (accurate measurement is possible) There is a problem that it is not suitable to use as a power source.

Patent Registration No. 10-1317220 (registered on April 4, 2013)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a smart sensor capable of replacing a power source supplied to a smart current sensor with a self- A self-powered smart current sensor that provides semi-permanent enhancement of operating life and unifies the sensor and power supply.

According to an aspect of the present invention, there is provided a smart current sensor comprising a primary winding, a secondary winding, and a core, the secondary winding being connected to the primary winding A first winding having a relatively larger number of turns than the number of turns of the first winding and a second winding having a relatively smaller number of turns than the first winding; A switching unit for switching between a first output and a second output respectively output from the first winding and the second winding; A signal processing unit for generating a measurement signal for measuring a current value or a current waveform of the primary winding based on the first output that is switched and input through the switching unit; A charge / discharge control unit for controlling charging and discharging of the battery (as a power source of the smart current sensor) based on the second output that is switched and input through the switching unit; And a main controller for collectively controlling the configuration of the smart current sensor (switching unit, signal processing unit, charge / discharge control unit), and inputting the measurement signal and processing according to a predetermined algorithm, The main control unit may control the switching operation of the switching unit according to a predetermined program.

According to another aspect of the present invention, there is provided a smart current sensor comprising a primary winding, a secondary winding, and a core, the secondary winding comprising at least a first winding And a second winding; A first switch for switching the first winding and the second winding to be connected or disconnected from each other in series, and a second switch for outputting the first coil from the first coil in accordance with an on or off state of the first switch A switching unit including a second switch for selectively switching at least one of a first output, a second output from the second winding, and a third output from a sum of the first and second windings; A charge / discharge control unit for controlling charging and discharging of the battery based on one of the first output and the third output that is switched and input through the switching unit; A signal processing unit for generating a measurement signal for measuring a current value or a current waveform of the primary winding based on one of the first output and the third output that is switched and input through the switching unit; And a main controller for collectively controlling the switching unit, the signal processing unit, and the charge / discharge control unit, and inputting the measurement signal and processing according to a predetermined algorithm, wherein the main winding or the main winding The sum of the first and second windings may have a relatively larger number of turns than the number of turns of the primary winding and the second winding may have a relatively smaller or equal number of turns than the first winding.

As described above, according to various aspects of the present invention, it is possible to perform required measurement while generating / supplying necessary power through self-power generation, so that the power supplied to the smart current sensor can be measured by a self- Power generation system.

Accordingly, the present invention solves all the conventional problems of the conventional internal battery or the external commercial power supply system, and can permanently improve the operation life of the smart sensor, thereby enabling the supply of the revolutionary IoT solution, and unifying the sensor and the power supply unit This makes it possible to integrate smart sensor into a single product and miniaturize it, and it can be used as a smart sensor for current measurement in various fields.

FIG. 1 is a diagram illustrating various examples of IoT (Internet of Things) services,
2 is a configuration diagram of a self-powered smart current sensor according to an embodiment of the present invention;
Figure 3 is an illustration of the current transformer of Figure 2,
4 is a view for explaining a general current transformer,
5 is a configuration diagram of a self-powered smart current sensor according to another embodiment of the present invention;
6 is an exemplary view of the current transformer and the switching unit of Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals are used to denote like elements in the drawings, even if they are shown in different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

2, the smart current sensor includes a current transformer 21, a switching unit 22, a signal processing unit 23, a charge / discharge control unit 24 ), A main control unit 25, a communication unit 26, and a battery 27.

A current transformer (CT) 21 is provided for performing a function as a current sensing device and a function as a power generation device. As shown in FIG. 3, a primary winding 211, a secondary winding 212, And a core 213, as shown in FIG.

In this embodiment, the secondary winding 212 may be composed of a plurality of windings including two or more windings. For example, the number N of turns (N2), which is relatively larger than the number of turns N1 of the primary winding 211 And a second winding 212b having a relatively smaller number of turns N3 than the first winding 212a.

Generally, the current output from the CT deflector using the electromagnetic induction phenomenon is in proportion to the current flowing in the primary winding and inversely proportional to the number of turns of the secondary winding surrounding the core (iron core). Therefore, if the number of turns of the secondary winding is large, the induced current can flow precisely because a small amount of current flows through the secondary winding, but it is not suitable for use as a power source because a microcurrent is induced.

4, assuming a current transformer having a number of turns of the secondary winding 10, a magnetic flux of? 1 is formed in the core by the current I1 flowing through the primary winding according to the right-hand rule. At this time, when the secondary winding forms a closed circuit, a secondary electromagnetic conversion occurs in which an induced current is generated in the secondary winding by the magnetic force formed on the iron core. This electromagnetic conversion is the same as that of action-reaction, so that the direction of the current appearing in the secondary winding is in the direction of Ø2 canceling the magnetic flux Ø1 generated in the primary winding and the magnitude of the secondary current I2 is offset by Ø1 by I1 We make Ø2 as much as we can make to create electromagnetic equilibrium in the core. That is, when the current I1 flowing in the primary winding is 10A, the current I2 induced in the secondary winding is 1A, which is inversely proportional to the number of turns.

As described above, the conventional commercial CT current transformer accurately measures the large current flowing through the primary winding (non-contact measurement using a CT current transformer when the current exceeds the allowable current range that can be measured by contact) using such electromagnetic induction phenomenon The secondary winding is fabricated to have a relatively larger number of turns than the primary winding, making it unsuitable for use as a power supply for a smart sensor.

In order to solve this problem, according to the present invention, when the current transformer 21 operates as a current sensing device for current measurement and when it operates as a power generation device using a current induced in the secondary winding, By varying the number of turns, a precise current measurement is possible, but a higher current can be induced in the secondary winding.

3, the current transformer 21 according to the present embodiment includes the secondary winding 212 as a multi-winding including at least a first winding 212a and a second winding 212b, The number of turns N2 of the first winding 212a is formed to have a relatively larger number of turns than the number of turns N1 of the primary winding 211 and the number of turns N3 of the second winding 212b is set to be larger than that of the first winding 212a, So that the current transformer 21 can perform both a role as a current sensing device and a role as a power generation device.

2, the switching unit 22 includes a first output (output 1) and a second output (output 2) respectively output from the first winding 212a and the second winding 212b of the secondary winding 212, To electrically connect the output terminal of the first winding 212a to the input terminal of the signal processing unit 23 or to electrically connect the output terminal of the second winding 212b and the input terminal of the charge and discharge control unit 24 (Or output) of the first output (current) output 1 from the first winding 212a of the secondary winding 212 of the current transformer 21 to the signal processing unit 23 The second output (current) output from the second winding 212b of the secondary winding 212 of the current transformer 21 is connected to (or opened) the output terminal of the first winding 212a and the input terminal of the signal processing unit 23, (or opening) the output terminal of the second winding 212b and the input terminal of the charging / discharging control section 24 so that the output 2 is input (or interrupted) to the charge-discharge control section 24 All.

The signal processing unit 23 generates a measurement signal for measuring the current value or the current waveform of the primary winding 211 based on the first output (output 1) that is switched and input through the switching unit 22 .

The signal processing unit 23 includes at least one of an RMS (Root Mean Square) method for measuring the current value flowing through the primary winding 211 and a WF (Wave Form) method for measuring the current waveform of the primary winding 211 Or a combination of the two methods.

For example, since the current flowing in the primary winding is AC (60 Hz sinusoidal wave) in general, the RMS signal processing unit 23 for measuring the current value basically has a rectifying unit for converting AC to DC through half wave rectification, And a precision analog-to-digital converter (ADC) for reading the current value.

However, the self-generated smart current sensor according to the embodiment of the present invention can analyze the current waveform through the analysis algorithm as well as the current value measurement, Estimation of life expectancy and failure can be diagnosed by analysis of the device's current consumption pattern.

The charge / discharge control unit 24 is for controlling the charging and discharging of the battery 27 (as a power source of the smart current sensor) based on the second output (output 2) inputted through the switching unit 22 and inputted.

The main control part 25 performs overall control of the switching part 22, the signal processing part 23, the charging and discharging control part 24 and the communication part 26 as the configuration of the smart current sensor, Signal for processing according to a predetermined algorithm.

The main control unit 25 may control the switching operation of the switching unit 22 according to a preset program. For example, the main control unit 25 may control the switching operation of the switching unit 22 according to a schedule program set on the basis of time .

The communication unit 26 communicates with a remote IoT service server (not shown), for example, in a wireless or wired manner under the control of the main control unit 25 and performs processing in the main control unit 25 The measurement signal can be transmitted.

The main control unit 25 and the communication unit 26 may be implemented as a single device physically coupled to each other.

The battery 27 is for storing the generated power and can be constituted by a supercap (large capacity capacitor) or a secondary battery. When the secondary battery is used, the charge / discharge control section 24 is provided with a regeneration charging algorithm .

FIG. 5 is a configuration diagram of a self-powered smart current sensor according to another embodiment of the present invention, and FIG. 6 is an illustration of a current transformer and a switching unit of FIG.

5, the self-generated smart current sensor according to another embodiment of the present invention includes a current transformer 51, a switching unit 52, a signal processing unit 53, a charge / discharge control unit 54, a main control unit 55, a communication unit 56, and a battery 57. [

A current transformer (CT) 51 is provided for performing a function as a current sensing device and a function as a power generating device. As shown in FIG. 6, a primary winding 511, a secondary winding 512, And a core 513.

In the present embodiment, the secondary winding 512 may be composed of multiple windings including two or more windings, for example, may include a first winding 512a and a second winding 512b.

The current transformer 51 according to the present embodiment operates as a current sensing device for measuring the current flowing in the primary winding 511 and as a power generating device using the current induced in the secondary winding 512 In some cases, by varying the number of turns of the secondary winding 512, a higher current can be induced in the secondary winding 512, while accurate current measurement is possible.

In other words, the current transformer 51 according to the present embodiment is configured such that, as shown in Fig. 6, the secondary winding 512 is composed of a multi-winding including at least a first winding 512a and a second winding 512b The number of turns n2 of the first winding 512a of the secondary winding 512 or the total number of turns n2 + n3 of the sum of the first and second windings 512a and 512b is the number of turns of the primary winding 511 the number of turns n3 of the second winding 512b is relatively smaller than or equal to the number of turns n2 of the first winding 512a n3).

As another example, the secondary winding 512 may be constituted by a single winding in which at least a first winding 512a and a second winding 512b are connected in series. In this case, the number of turns of the secondary winding 512 (n2 + n3 Has a relatively larger number of turns than the number of turns (n1) of the primary winding 511 and has a number of turns optimized for co-use with the current sensing and power sources.

The switching unit 52 according to the present embodiment may include a first switch 521 and a second switch 522, as shown in Figs. 5-6.

The first switch 521 operates in an on or off state under the control of the main controller 55 to connect the first winding 512a and the second winding 512b of the secondary side to each other in series Or non-connection.

The second switch 522 outputs the first output (output 1) output from the first winding 512a according to the on or off state of the first switch according to the control of the main controller 55, For selectively switching at least one of a second output (output 2) output from the two windings 512b and a third output (output 3) output from the sum of the first and second windings 512a + 512b will be.

For example, the switching section 52 outputs the first output (output 1) output from the first winding 512a to the signal processing section 53 (second output) according to the switching states of the first switch 521 and the second switch 522 ) Or the input of the charge / discharge control section 54 or the second output (output 2) output from the second winding 512b as the input of the signal processing section 53 or the charge / discharge control section 54, or The third output (output 3) output from the sum of the first and second windings 512a and 512b may be provided to the signal processing unit 53 or the charge / discharge control unit 54 as inputs.

For example, the switching unit 52 may provide a third output (output 3) when the first switch 521 is on as an input to the signal processing unit 53, The first output (output 1) or the second output (output 2) may be provided to the charge / discharge control unit 54 as an input.

The signal processing unit 53 is connected to the output of the current transformer 51 based on one of the first output (output 1), the wp2 output (output 2), and the third output (output 3) And generates a measurement signal for measuring the current value or the current waveform of the primary winding 511. For example, the measurement signal is generated based on the third output (output 3) input through the switching unit 52 .

The signal processing unit 53 includes at least one of an RMS (Root Mean Square) method for measuring the current value flowing through the primary winding 511 and a WF (Wave Form) method for measuring the current waveform of the primary winding 511 Or a combination of the two methods.

For example, since the current flowing in the primary winding is AC (60 Hz sinusoidal wave) in general, the RMS signal processing unit 53 for measuring the current value basically has a rectifying unit for converting AC to DC through half wave rectification, And a precision analog-to-digital converter (ADC) for reading the current value.

Conventional current sensors generally measure only a quantitative current value. However, the non-power smart current sensor according to the embodiment of the present invention can analyze the current waveform through the analysis algorithm as well as the current value measurement, The estimation of the life expectancy and the failure can be diagnosed through analysis of the consumption current pattern of the battery.

Discharge control unit 54 is based on one of a first output (output 1), a wp2 output (output 2), and a third output (output 3) that is switched and input through the switching unit 52 The first output or second output energy inputted through the switching unit 52 is supplied to the battery 57 (for example, Or discharges the energy stored in the battery 57 so that the battery can be used as a power source of the self-generated smart current sensor.

The main control part 55 collectively controls the operations of the switching part 52, the signal processing part 53, the charge / discharge control part 54 and the communication part 56 as the configuration of the (self-generated) smart current sensor, 53 and processes it according to a predetermined algorithm.

The main control unit 55 may control the switching operations of the first and second switches 521 and 522 of the switching unit 52 according to a predetermined program. For example, So that the switching operation of the unit 22 can be controlled.

The communication unit 56 communicates with a remote IoT service server (not shown), for example, in a wireless or wired manner under the control of the main control unit 55, The measurement signal can be transmitted.

The main control unit 55 and the communication unit 56 may be implemented as a single device physically coupled to each other.

The battery 57 is for storing the generated power energy and can be constituted by a supercap (a large capacity capacitor) or a secondary battery. When a secondary battery is used, the charge / discharge control unit 54 is equipped with a regeneration charging algorithm can do.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

21,51: Current transformer (CT)
22, 52:
23, 53:
24, 54: Charge /
25,55: Main Controller (MCU)
26, 56:
27,57: Battery

Claims (7)

delete delete delete In a smart current sensor,
A primary winding, a secondary winding, and a core, said secondary winding comprising at least a first winding and a second winding;
A first switch for switching the first winding and the second winding to be connected or disconnected from each other in series, and a second switch for outputting the first coil from the first coil in accordance with an on or off state of the first switch A switching unit including a second switch for selectively switching at least one of a first output, a second output from the second winding, and a third output from a sum of the first and second windings;
A charge / discharge control unit for controlling charging and discharging of the battery based on the first output or the second output inputted through the switching unit;
A signal processing unit for generating a measurement signal for measuring a current value and a current waveform of the primary winding based on the third output that is switched and input through the switching unit;
A main controller for collectively controlling the switching unit, the signal processing unit, and the charge / discharge control unit, for inputting the measurement signal and processing the measurement signal according to a predetermined algorithm; And
And a communication unit for communicating in a wireless or wired manner under the control of the control unit,
Wherein the sum of the first winding or the first winding and the second winding of the secondary winding has a relatively larger number of turns than the number of turns of the primary winding and the second winding has a relatively smaller or equal number of turns than the first winding The number of turns,
Wherein the predetermined algorithm analyzes the current waveform to analyze a consumed current pattern of the electric device, and performs an estimation of life expectancy and a diagnosis of failure, the charge / discharge control unit includes a regeneration charging algorithm for regeneration charging of the battery Wherein the main controller controls the switching operation of the switching unit according to a preset program.
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