KR20230070995A - A temperature reader logger which periodically senses, logs, and transmits temperature in a low-power method and can be replaced or managed without opening a fresh logistics box, and a fresh logistics system including the same - Google Patents

Abstract

According to embodiments of the present invention, a detachable member for detachable to a fresh distribution box; A first wireless communication module for performing communication with a passive sensor tag installed in the fresh distribution box to measure the internal temperature of the fresh distribution box; a memory for storing a sensing value sensed by the passive sensor tag; A second wireless communication module for performing communication with an external terminal and transmitting the sensing value to the external terminal; and a power supply unit for driving the first and second wireless communication modules.

Description

A temperature reader logger capable of periodically sensing, storing, and transmitting temperature in a low-power method and capable of replacement management without opening the fresh logistics box, and a fresh logistics system including the same {A TEMPERATURE READER LOGGER WHICH PERIODICALLY SENSES, LOGS, AND TRANSMITS TEMPERATURE IN A LOW-POWER METHOD AND CAN BE REPLACED OR MANAGED WITHOUT OPENING A FRESH LOGISTICS BOX, AND A FRESH LOGISTICS SYSTEM INCLUDING THE SAME}

The present invention relates to a temperature reader logger, and more particularly, to a temperature reader logger capable of periodically sensing, storing, and transmitting temperature in a low-power method and capable of managing replacement without opening a fresh distribution box, and a fresh distribution system including the same. will be.

Various technologies for temperature monitoring of fresh logistics have been proposed, but all of them are satisfied with battery maintenance of temperature sensor, cleaning of distribution box, securing internal temperature of box, securing accuracy of measuring room temperature inside and outside of box, and periodic temperature sensing and management. However, there is a demand for a technology for realizing efficient fresh logistics at a low unit price.

Korean Patent Publication No. 10-2019-0016817 (2019.02.19.) Korean Registered Patent Publication No. 10-1773380 (2017.08.31.)

The present invention has been made to solve the above-described problems, and an object of the present invention is a temperature reader logger capable of periodically sensing, storing, and transmitting temperature in a low-power method and capable of replacement management without opening a fresh distribution box, and including the same It is to provide a fresh logistics system.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to an embodiment of the present invention in order to solve these problems, a detachable member for detachable to the fresh distribution box; A first wireless communication module for performing communication with a passive sensor tag installed in the fresh distribution box to measure the internal temperature of the fresh distribution box; a memory for storing a sensing value sensed by the passive sensor tag; A second wireless communication module for performing communication with an external terminal and transmitting the sensing value to the external terminal; and a power supply unit for driving the first and second wireless communication modules.

The active temperature reader logger is characterized in that it periodically transmits wireless power to the passive sensor tag through the first wireless communication module and periodically receives the sensed value from the passive sensor tag.

The first wireless communication module performs short-range wireless communication with the passive sensor tag in a frequency band of 100 kHz to 15 MHz, and the second wireless communication module performs short-range wireless communication with the external terminal in a frequency band of 1 GHz to 10 GHz. It is characterized in that short-distance wireless communication or mobile communication is performed.

In addition, according to an embodiment of the present invention in order to solve this problem, the sensing circuit unit is driven by the power received from the external reader to measure two or more sensing values; An MCU (Micro Controller Unit) that receives the two or more sensing values; and an antenna unit receiving power and signals from the external reader and transmitting the two or more sensed values to the external reader.

The MCU includes an operational amplifier (OP-AMP), and the sensing circuit unit includes a driving voltage node; a first non-variable resistor having one end connected to the driving voltage node; a second non-variable resistor having one end connected to the driving voltage node and connected in parallel with the first non-variable resistor; a first variable resistor having one end connected in series to the other end of the first non-variable resistor and the other end being grounded; a second variable resistor having one end connected in series to the other end of the second non-variable resistor and the other end being grounded; a first measurement voltage node positioned at a contact point between the other end of the first non-variable resistor and one end of the first variable resistor, and connected to the (-) input terminal of the amplifier; and a second measuring voltage node positioned at a contact point between the other end of the second non-variable resistor and one end of the second variable resistor, and connected to a (+) input terminal of the amplifier, wherein the antenna unit includes the first measuring voltage node. 1 characterized in that the first sensed voltage value at the measured voltage node and the second sensed voltage value at the second measured voltage node are transmitted to the external reader.

Each of the first variable resistor and the second variable resistor is a first thermistor and a second thermistor, and the external reader or a management server capable of communicating with the external reader is provided with the first sensing voltage value and the second sensing voltage value. A first temperature value in a space where the first thermistor is disposed and a second temperature value in a space where the second thermistor is disposed are calculated based on the respective values.

The MCU further includes an analog-to-digital converter (ADC) input port, and the sensing circuit unit has one end connected to the driving voltage node and connected in parallel to the first non-variable resistor and the second non-variable resistor. a third non-variable resistance; a third variable resistor having one end connected in series to the other end of the third non-variable resistor and the other end being grounded; and a third measurement voltage node located at a contact point between the other end of the third non-variable resistor and one end of the third variable resistor and connected to the ADC input port, wherein the antenna unit further includes the third measurement voltage node. It is characterized in that the third sensing voltage value at the node is further transmitted to the external reader.

Each of the first variable resistor, the second variable resistor, and the third variable resistor is a first thermistor, a second thermistor, and a third thermistor, and the external reader or a management server capable of communicating with the external reader operates on the first sensing voltage. a first temperature value in a space where the first thermistor is disposed, a second temperature value in a space where the second thermistor is disposed, and the It is characterized in that the third temperature value in the space where the third thermistor is disposed is calculated.

The passive multi-channel sensor tag receives reference power of 1 mW to 37 mW when the external reader approaches the passive multi-channel sensor tag within a tagging distance of 5 mm to 30 mm, and uses only the received reference power to generate the first to second passive multi-channel sensor tags. 3 sensing voltage values are measured and transmitted with a resolution of 8 bits to 50 bits, and the measurement and transmission of the first to third sensing voltage values are performed while the OP-AMP is turned off.

In addition, according to an embodiment of the present invention for solving the above problems, a temperature management system including at least one passive multi-channel sensor tag, at least one external reader, a management server, and a manager interface is provided.

The passive multi-channel sensor tag includes a sensing circuit unit driven by power received from the external reader and measuring two or more sensing values; An MCU (Micro Controller Unit) that receives the two or more sensing values; and an antenna unit for receiving power and signals from the external reader and transmitting the two or more sensed values to the external reader, wherein the two or more sensed values are selected from among the external reader, the management server, and the manager interface. It is characterized in that it is parsed as two or more temperature values by any one.

According to the embodiments of the present invention, while precisely sensing the inside and outside temperature of the box with a passive sensor tag that does not have a separate power supply unit, and at the same time having an active temperature reader logger installed on the outside of the box, the fresh logistics temperature is accurately and It can be periodically sensed and managed.

In addition, high reliability can be obtained by monitoring the temperature in the entire process of fresh logistics through tagging of the manager's terminal with a passive sensor tag even in the logistics environment or the reader logger battery discharge state.

Furthermore, since the temperature reader logger is fastened in a detachable structure without opening the box, the internal opening of the distribution box is excluded in a series of processes such as distribution box replacement, battery replacement, etc. can be maintained, and maintenance such as box cleaning can be conveniently performed.

In addition, according to the multi-channel passive sensor tag driven by receiving power by the temperature reader logger of the present invention, it is possible to accurately measure the temperature inside and outside the box at a low cost, and thus it is possible to set and maintain the optimal temperature conditions for each environment of fresh logistics. .

Effects according to the technical spirit of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a diagram conceptually showing the configuration of a temperature reader and logger according to some embodiments of the present invention.
2 is a view illustratively showing a state in which a temperature reader logger according to some embodiments of the present invention is mounted in a fresh distribution box.
3 and 4 are diagrams for explaining a fresh logistics system including a temperature reader and logger according to some embodiments of the present invention.
5 is a diagram conceptually showing the configuration of a sensor tag according to some embodiments of the present invention.
6 is a diagram for explaining a method of sensing and managing temperature information for each channel in a temperature management system according to some embodiments of the present invention.
7 is a diagram for explaining a method of sensing and managing temperature information for each channel in a temperature management system according to some other embodiments of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms, only the present embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

Also, in this specification, the singular form may also include the plural form unless otherwise specified in the phrase. As used herein, "comprises" and/or "comprising" means that a stated component, step, operation, and/or element is present in the presence of one or more other components, steps, operations, and/or elements. or do not rule out additions.

The sensor tag of the present invention is a passive type sensor tag not equipped with its own power source (for example, a battery), and a single sensor tag can perform a role of sensing and transmitting two or more sensed values to a reader. For example, the sensor tag may be implemented to include a plurality of temperature sensors for respectively measuring the temperatures of two or more different spaces.

1 is a view conceptually showing the configuration of a temperature reader logger according to some embodiments of the present invention, and FIG. 2 is an exemplary view of the temperature reader logger according to some embodiments of the present invention being mounted in a fresh distribution box. , and FIGS. 3 and 4 are diagrams for explaining a fresh logistics system including a temperature reader and logger according to some embodiments of the present invention.

1 and 2, the active temperature reader logger 100 includes a body 110, a display unit 120 and a user input unit 130 provided on the front of the body unit 110, and internal battery charging. It may include an external input terminal 140 for the like, and detachable parts 151 and 152 for attaching and detaching to the fresh distribution box.

In addition, although not shown, the active temperature reader logger 100 includes a first wireless communication module for communicating with the passive sensor tag 1000 installed in the fresh distribution box to measure the internal temperature of the fresh distribution box, and a passive sensor. A memory for storing the sensing value sensed by the tag 1000, a second wireless communication module for performing communication with an external terminal and transmitting the sensing value to the external terminal, and the first and second wireless communication modules A power supply unit for driving them may be included.

The active temperature reader/logger 100 periodically transmits wireless power to the passive sensor tag 1000 through the first wireless communication module and periodically receives the sensing value from the passive sensor tag 1000.

Here, the first wireless communication module performs short-range wireless communication with the passive sensor tag 1000 in a frequency band of 100 kHz to 15 MHz, and the second wireless communication module performs wireless communication with the external terminal at 1 GHz to 10 GHz. It is characterized by performing short-range wireless communication or mobile communication in a frequency band of.

For a more specific example, one active temperature reader logger 100 is mounted on a box to be matched 1:1 with one passive sensor tag 1000, and the first wireless communication module of the active temperature reader logger 100 is a passive sensor tag 1000. Wireless power is supplied to the passive sensor tag 1000 through short-range wireless communication (eg, NFC or RFID communication), and accordingly, the temperature value inside and outside the fresh distribution box sensed by the passive sensor tag 1000 can be transmitted. .

That is, the first wireless communication module is a reader module that supplies wireless power to the passive sensor tag 1000 and receives sensing values when the active temperature reader logger 100 performs passive short-range wireless communication with the passive sensor tag 1000. It may be a module that serves as (eg, an NFC reader module).

The second wireless communication module may be, for example, an active short-range wireless communication module (eg, a BLE (Bluetooth Low Energy) module) or a mobile communication module. It may include both a module and a mobile communication module.

That is, the second wireless communication module may be a module for performing communication with a delivery manager terminal, a manager terminal, a management server, etc. without a user's tagging operation.

As shown in FIG. 6, when the second wireless communication module is a BLE module, at least one active temperature reader/logger 100 may be paired with an external terminal (eg, a smartphone of a delivery driver delivering distribution boxes). . That is, the box temperature information collected by the active temperature reader logger 100 provided in each of the plurality of boxes can be collected and managed by an external terminal (6, for example, a delivery manager or manager terminal).

The temperature reader logger 100 may transmit the temperature value to the external terminal 6 whenever a temperature value is received from the sensor, or store the temperature value for each cycle in the memory and transmit the temperature values for a plurality of cycles at once.

The external terminal 6 includes the temperature value received from the temperature reader logger 100, external terminal information other than the temperature (eg, time information matched with individual temperature values, GPS information), and other management information (eg, , product information in the distribution box, transportation information, etc.) can be collected and transmitted to the management server.

Alternatively, as shown in FIG. 7 , when the second wireless communication module is a mobile communication module, the temperature reader logger 100 may periodically transmit sensing temperature value information to the management server 3 through the information communication network 5 .

5 is a diagram conceptually showing the configuration of a sensor tag according to some embodiments of the present invention.

The internal configuration of the sensor tag 1 shown in FIG. 5 is conceptually shown for convenience of explanation, but is not limited thereto. In addition, it goes without saying that the sensor tag 1 may include other additional components (excluding a battery) other than the sensing circuit unit, MCU, and antenna unit to be described later. Furthermore, the sensing circuit unit, MCU, and antenna blocks are shown with simplified shapes and arrangements. For example, the variable resistors Th1, Th2, and Th3 shown in FIGS. 1 and 2 are physically separated from the sensor tag body. It can be branched and placed in a location.

On the other hand, the MCU 20 employed in the sensor tags 1, 1', 1" of the present invention is an MCU having a short-range wireless communication interface such as RFID or NFC, and the MCU 20 has at least one OP- An MCU including an operational amplifier (AMP 210) and at least one analog-digital converter (ADC) input port 220, which will be described in detail later.

The passive 2-channel multi-channel sensor tag (1) includes a sensing circuit unit (10) that measures two sensing values driven by power received from an external reader, an MCU (20, Micro Controller Unit) that receives two sensing values, and an external It may be configured to include an antenna unit 30 that receives power and signals from the reader and transmits two sensed values to an external reader.

The sensing circuit unit 10 includes at least two or more non-variable/variable resistor sets connected in series from the driving voltage node Vdd to the ground terminal.

Specifically, the sensing circuit unit includes a first non-variable resistor R1 having one end connected to the driving voltage node Vdd and one end connected to the driving voltage node vdd as shown in FIG. 1 . A second non-variable resistor (R2) connected in parallel with (R1), one end connected in series with the other end of the first non-variable resistor (R1) and a first variable resistor (Th1) whose other end is grounded, one end of the second A second variable resistor Th2 connected in series to the other end of the non-variable resistor R2 and the other end of which is grounded, located at a contact between the other end of the first non-variable resistor R1 and one end of the first variable resistor Th1 However, the first measurement voltage node (V ^- _in ) connected to the (-) input terminal of the amplifier (ie, OP-AMP 210) and the other end of the second non-variable resistor R2 and the second variable resistor Th2 ), but may include a second measurement voltage node (V ⁺ _in ) connected to the (+) input terminal of the OP-AMP (210).

In some embodiments, each of the first variable resistor Th1 and the second variable resistor Th2 may be a thermistor whose resistance characteristics change according to temperature. For example, each of the first variable resistor Th1 and the second variable resistor Th2 may be a negative temperature coefficient thermistor (NTC), a positive temperature coefficient thermistor (PTC), or a critical temperature resistor (CTR).

In this case, the antenna unit 30 of the sensor tag 1 measures the voltage values (more precisely, after the measurement) measured at each of the first measurement voltage node (V ^- _in ) and the second measurement voltage node (V ⁺ _in ). voltage values digitized in the MCU) to an external reader, and the external reader or the management server capable of communicating with the external reader is a first sensing voltage value and a second sensing voltage value, respectively, based on a preset voltage-temperature conversion table. From this, it is possible to calculate a first temperature value in a space where the first thermistor is disposed and a second temperature value in a space where the second thermistor is disposed.

On the other hand, in the case of the 3-channel sensor tag 1' shown in FIG. 5, the sensing circuit unit 10' has one end connected to the driving voltage node Vdd as shown, and the first non-variable resistor R1 and the second non-variable resistor R1. 2 A third non-variable resistor R3 connected in parallel with the non-variable resistor R2, one end connected in series with the other end of the third non-variable resistor R3 and the other end connected to the third variable resistor Th3 ), and a third non-variable resistor (R3) and a third measurement voltage node (V ^ADC _in ) located at the contact point of one end of the third variable resistor (Th3) and connected to the ADC input port 220. can include The third variable resistor Th3 may also be a thermistor similarly to the first and second variable resistors, and for example, the third variable resistor Th3 may be an NTC, PTC, or CTR.

In this case, the antenna unit 30 of the sensor tag is a voltage value measured at each of the first measurement voltage node (V ^- _in ), the second measurement voltage node (V ⁺ _in ), and the third measurement voltage node (V ^ADC _in ). may be transmitted to an external reader, and the external reader or the management server capable of communicating with the external reader generates a first sensing voltage value from each of the first sensing voltage value, the second sensing voltage value, and the third sensing voltage value based on a preset voltage-temperature conversion table. The first temperature value in the space where the thermistor is disposed (eg, space outside the distribution box), the second temperature value in the space where the second thermistor is disposed (eg, upper space inside the distribution box), and the third thermistor It is possible to calculate a third temperature value in a space where is disposed (eg, a lower space inside the distribution box).

Meanwhile, regardless of the number of channels described above, a series of processes in which the multi-channel sensor tag of the present invention receives power from an external reader, measures a sensed value, and then transmits the measured value to the external reader is the MCU of the multi-channel sensor tag. It is performed in a state in which the OP-AMP 210 provided in (20) is turned off. Here, that the OP-AMP 210 is turned off may mean that power supply to the OP-AMP or power consumption by the OP-AMP is not substantially made, and the OP-AMP is the input value (V ^- It may also mean that an operation amplification function based on _in , V ⁺ _in ) (eg, V _out =A*(V ⁺ _in -V ^- _in ), etc.) is not performed.

In order to secure sufficient measurement voltage/conversion temperature resolution in the turn-off state of the OP-AMP and at the same time perform sufficient operation with only the wirelessly transmitted power without self-power, the sensor tag MCU of the present invention transmits each sensed analog value for each channel. It is preferable to use an MCU capable of digital conversion with a resolution of 8bit to 50bit, and in this case, even in a low power environment, sufficiently precise temperature measurement is possible without using the OP-AMP's V ⁺ _in , _V ^-in difference value amplification method.

The reason why the OP-AMP 210 is turned off is because the amplifier inside the OP-AMP consumes a lot of power, so the voltage values themselves are transmitted through wireless communication such as NFC (via a reader such as a smartphone) without operation amplification. and transmits it to the server (transferred voltage values are converted into temperature values by table matching in the server as described above).

In addition, even though OP-AMP amplification is unnecessary, the reason why MCUs with OP-AMPs are adopted is that the need for development/production management for a separate MCU for implementing multi-channel tags can be eliminated.

That is, by unifying the MCU used in the conventional single-channel sensor tag and the MCU of the multi-channel sensor tag in the present invention, development and production management costs for single-channel/multi-channel sensor tags can be drastically reduced.

Accordingly, the present invention measures and transmits sensing values for each channel having a high resolution of 8 bits to 50 bits through low power of 1 mW to 37 mW received at a sufficient tagging distance of 5 mm to 30 mm, thereby realizing a passive multi-channel sensor tag with low power and high reliability. there will be

6 is a diagram for explaining a method of sensing and managing temperature information for each channel in a temperature management system according to some embodiments of the present invention, and FIG. 7 is a diagram in a temperature management system according to some other embodiments of the present invention. It is a diagram for explaining a method of sensing and managing temperature information for each channel.

6 to 7, the temperature management system includes at least one passive multi-channel sensor tag (1, 1', 1"), at least one tag reader 2, a management server 3, and a manager. It may include an interface 4. In addition, the tag reader 2 may also have a separate user interface for tagging for sensing, confirmation of sensing, and management of confirmation of a sensing value.

At least one of the tag reader 2, the management server 3, and the manager interface 4 can perform data communication with each other in real time through the information communication network 5. The information communication network 5 is, for example, a wired network or mobile radio communication network such as a local area network (LAN), a wide area network (WAN), or a value added network (VAN). network), a satellite communication network, Bluetooth, Wibro (Wireless Broadband Internet), HSDPA (High Speed Downlink Packet Access), and the like.

The management server 3 stores and processes the information input from the tag reader 2 and/or the manager interface 4, and responds to requests from each terminal to process the corresponding process without delay. A high-performance processor and A server device including a workstation or the like having a large storage space may be used.

The consumer interface and manager interface 4 of the tag reader 2 may be implemented in various smart devices such as, for example, smart phones, smart notes, tablet PCs, smart cameras, smart TVs, and wearable computers, and PCS (Personal Communication System), GSM (Global System for Mobile communications), PDC (Personal Digital Cellular), PHS (Personal Handyphone System), PDA (Personal Digital Assistant), IMT (International Mobile Telecommunication)-2000, CDMA (Code Division Multiplex) Access)-2000, W-CDMA (W-Code Division Multiple Access), Wibro (Wireless Broadband Internet) terminal, etc. may be implemented by all types of handheld-based wireless communication devices, and web browsers (WEB Browser) may be implemented by a desktop, a notebook, a laptop, or the like.

Each terminal that physically implements the consumer interface and manager interface 4 of the tag reader 2 has a communication unit that communicates with the management server 3 to implement the above-described functions and a user interface for each function. A recording medium capable of being read and written by a computing device on which an application program displayed through is recorded may be mounted.

Each of the passive multi-channel sensor tags (1, 1', 1") in the temperature management system may have various numbers of sensors depending on the purpose and environment. For example, the first sensor tag (1) shown in FIG. ) or three sensors 11, 12, 13 like the second and third sensor tags 1' and 1". Also, some of the sensors may be sensors branched from the tag body, and some other sensors may be sensors disposed inside the tag body.

When the tag reader 2 is tagged with the sensor tag 1, the sensor tag 1 supplies power for driving the sensor tag 1 through the RF field energy generated from the antenna of the tag reader 2. can be obtained

The sensor unit of the sensor tag 1 obtains sensing values for each channel using the obtained power, and the MCU transfers the acquired sensing values for each channel to the NFC interface without parsing. Sensed values for each channel may be transmitted to the tag reader 2 . That is, the sensor tag 1 is the voltage measured at each of the first measurement voltage node (V ^- _in ), the second measurement voltage node (V ⁺ _in ) and the third measurement voltage node (V ^ADC _in ) shown in FIG. 2 . The values are transmitted to the tag reader (2) without converting them into temperature values.

In some embodiments, as shown in FIG. 4, the tag reader 2 transmits sensing values for each channel (ie, measured voltage values) to the management server 3, and the management server 3 transmits the Based on the set voltage-temperature conversion table, sensing values for each channel are parsed to calculate temperature information for each sensor tag/channel of the sensor tag, and the calculated temperature information for each channel is stored in the tag reader (2) and/or the manager interface (4). ) can be transmitted. The transmitted temperature information for each channel can be displayed through the user interface of the tag reader 2 or the manager interface 4 .

In some other embodiments, as shown in FIG. 5 , the tag reader 2 parses the sensing values for each channel received from the sensor tag 1 based on a preset voltage-temperature conversion table, and for each sensor tag/sensor. Temperature information for each channel of the tag is calculated, and the calculated temperature information for each channel can be displayed through the GUI of the tag reader 2. The calculated temperature information for each channel may be collected by the management server 3 and converted into big data through the manager interface 4 or the like.

Those skilled in the art related to the present embodiment will be able to understand that it may be implemented in a modified form within a range that does not deviate from the essential characteristics of the above description. Therefore, the disclosed methods are to be considered in an illustrative rather than a limiting sense. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent scope will be construed as being included in the present invention.

Claims (3)

As an active temperature reader logger,
Detachable member for attachment and detachment to the fresh distribution box;
A first wireless communication module for performing communication with a passive sensor tag installed in the fresh distribution box to measure the internal temperature of the fresh distribution box;
a memory for storing a sensing value sensed by the passive sensor tag;
A second wireless communication module for performing communication with an external terminal and transmitting the sensing value to the external terminal; and
A power supply unit for driving the first and second wireless communication modules; including, an active temperature reader and logger.
According to claim 1,
Characterized in that the active temperature reader logger periodically transmits wireless power to the passive sensor tag through the first wireless communication module and periodically receives the sensed value from the passive sensor tag. .
According to claim 1,
The first wireless communication module performs short-range wireless communication with the passive sensor tag in a frequency band of 100 kHz to 15 MHz,
The second wireless communication module is an active temperature reader logger, characterized in that for performing short-range wireless communication or mobile communication with the external terminal in a frequency band of 1 GHz to 10 GHz.

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