KR102220529B1 - Transformer power tap changer automatic switching method and system - Google Patents

Abstract

The present invention provides a method and an apparatus for automatically converting a transformer power tap, which select and drive a corresponding relay in accordance with a voltage change of a load, lower breakdown voltage characteristics of an adjacent voltage (current) control element, and automatically convert a power tap by driving an SCR which an electronic switch element. According to the present invention, the apparatus for automatically converting a transformer power tap comprises: a coil winding unit including a primary-side winding having a first to an N^th power tap corresponding to a first voltage to an N^th voltage in accordance with an input-side voltage, and a secondary-side winding to output a voltage to a load side; a load voltage detection unit to detect a voltage of the load side; a control unit which, if the voltage of the load side detected by the load voltage detection unit changes, outputs a command for switching to a power tap corresponding to a changed voltage; and a switching unit to switch to a corresponding power tap in accordance with a power tap switching command of the control unit.

Description

Transformer power tap changer automatic switching method and system}

The present invention relates to an apparatus and method for automatically converting a power supply tap of a transformer, and more particularly, by selecting and driving a corresponding relay according to a voltage fluctuation on a load side to automatically convert the power supply tap to improve the withstand voltage characteristics of a voltage (current) control element. It relates to an apparatus and a method for automatically converting a power supply tap of a transformer that can be reduced.

In general, in large-scale commercial applications, distributed power sources of new and renewable energy are connected to distribution lines, and low voltage and overvoltage occur, including problems such as voltage instability and system, and damage such as excitation inrush current due to harmonics occurs. .

Therefore, the electricity supplier must manually adjust the transformer's tap-changer from time to time whenever fluctuations in the output voltage occur. The power outage for adjusting one tap increases the maintenance cost, causes human accidents and shortens the life of the transformer.

The accumulated heat generated in the tap changer due to incomplete switch changeover or change of tap setting due to uninterrupted operation, for example, can quickly lead to serious failure of the transformer.

This is quite expensive in terms of the cost of replacing the transformer and associated equipment and the downtime it takes to replace it, and there is also a potential risk to the operator.

In addition, when switching the tap according to the voltage fluctuation on the load side of the conventional transformer, the power supply of the transformer is switched off manually by the operator, and the power is applied to the transformer again.

Therefore, due to the excitation inrush current and noise generated during tap switching, a stable current supply to the electronic device is not made, causing a malfunction or shortening the life of the transformer.

As a related prior patent document, there is Korean Patent Publication No. 10-0624496 (registered on September 08, 2006), and the document includes a device for preventing excitation inrush current and excitation overcurrent generated during initial power application and tap switching of a transformer. The control method is described.

It is an object of the present invention to select and drive a corresponding relay according to the voltage fluctuation on the load side, and to automatically convert the power tap by driving the SCR, which is an electronic switch element, to lower the withstand voltage characteristic of the voltage (current) control element, It is to provide a transformer power tap automatic conversion device and method.

A transformer power tap automatic conversion device according to an embodiment of the present invention for achieving the above object is a primary winding having first to Nth power taps respectively corresponding to a first voltage to an Nth voltage according to an input voltage. And, a coil winding unit including a secondary winding for outputting a voltage to the load side; A load voltage detector for detecting a voltage on the load side; A control unit for outputting a command for switching to a power tap corresponding to the changed voltage when the voltage on the load side detected by the load voltage detection unit fluctuates; And a switching unit for switching to a corresponding power tap according to a power tap switching command of the control unit.

Further, when N is 4, the first voltage may be 0V, the second voltage may be 600V, the third voltage may be 1200V, and the fourth voltage may be 1800V.

In addition, the switching unit may include a relay and a thyristor (SCR).

In addition, the input-side voltage is 13200V or 19200V, and each voltage of the first to Nth voltage according to the input-side voltage may be one of 0V voltage, 600V voltage, 1200V voltage, and 1800V voltage.

In addition, the voltage on the load side may vary in units of 7V within a voltage of 225V to 235V.

In addition, a communication unit for communicating with an external device; And a remote control device for transmitting a command to switch to a power tap corresponding to the changed voltage of the load side at a remote location.

In addition, the control unit transmits the voltage value of the load side detected through the load voltage detection unit to the remote control device through the communication unit, and switches from the remote control device to a power tap corresponding to the changed voltage at the load side. It is possible to receive the command to be applied to the switching unit.

In addition, when the voltage on the load side is detected to be 235V or more, the controller may output a command to switch to a power tap corresponding to the voltage on the load side 230V to the switching unit so that the voltage on the load side becomes 230V.

On the other hand, the transformer power tap automatic conversion method according to an embodiment of the present invention for achieving the above-described object is 1 including first to Nth power taps respectively corresponding to the first voltage to the Nth voltage according to the input-side voltage. A method for automatically converting a power supply tap of a transformer comprising a coil winding unit including a secondary winding and a secondary winding for outputting a voltage to a load, the method comprising: (a) a voltage detector detecting a voltage on the load side; (b) determining, by a control unit, whether the voltage on the load side detected through the load voltage detection unit changes; (c) outputting, by the control unit, a command for switching to a power tap corresponding to the changed voltage to a switching unit; And (d) switching the switching unit to the corresponding power tap according to the power tap switching command of the control unit.

In addition, in step (b), the control unit may determine whether the voltage on the load side changes from one voltage to another voltage in units of 7V within 225V to 235V or to a voltage of 235V or more.

Further, in step (c), the control unit may output a command to switch the power tap corresponding to the changed voltage to one of an OV power tap, a 600V power tap, a 1200V power tap, and an 1800V power tap to the switching unit. .

And, in the step (d), the switching unit drives a relay element and a thyristor (SCR) element for switching to an OV power tap or for switching to a 600V power tap according to a power tap switching command of the control unit. Drives a relay device and a thyristor (SCR) device, or drives a relay device and a thyristor (SCR) device for conversion to a 1200V power tap, or drives a relay device and a thyristor (SCR) device for conversion to a 1800V power tap Switching can be switched.

The present invention has the effect of lowering the withstand voltage characteristic of an adjacent voltage (current) control element by selectively driving a corresponding relay according to a voltage fluctuation on the load side.

In addition, according to the present invention, a circuit can be simplified by performing tap change through a relay and a thyristor (SCR) according to a voltage fluctuation on the load side.

In addition, the present invention independently operates the tap change according to the voltage fluctuation on the load side of the transformer, and by remotely switching the tap switching at a remote location, it is possible to easily manage the transformer without the administrator or operator going to the place where the transformer is located. .

1 is a block diagram schematically showing a main configuration of an apparatus for automatically converting a power supply tap for a transformer according to an embodiment of the present invention.
2 is a diagram showing an example of a configuration of a switching unit according to an embodiment of the present invention.
3 is a block diagram schematically showing the configuration of a transformer power tap automatic conversion device according to another embodiment of the present invention.
4 is a diagram illustrating an operation flow chart for explaining a method of automatically converting a power supply tap of a transformer according to an embodiment of the present invention.
5 is a view showing an example of the configuration of a transformer power tap automatic conversion device according to another embodiment of the present invention.
6 is a diagram schematically showing the configuration of a dual interface NFC tag device according to another embodiment of the present invention.
7 and 8 are circuit diagrams illustrating a combination of a first port and a second port of a dual interface NFC tag device according to another embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only this embodiment is to complete the disclosure of the present invention, and the general knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to the possessor, and the invention is only defined by the scope of the claims. Accordingly, in some embodiments, well-known process steps, well-known device structures, and well-known techniques have not been described in detail in order to avoid obscuring interpretation of the present invention. The same reference numerals refer to the same components throughout the specification.

In the drawings, the thicknesses are enlarged to clearly express various layers and regions. The same reference numerals are assigned to similar parts throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where the other part is "directly above", but also the case where there is another part in the middle. Conversely, when one part is "directly above" another part, it means that there is no other part in the middle. Further, when a part such as a layer, film, region, plate, etc. is said to be "under" another part, this includes not only the case where the other part is "directly below", but also the case where there is another part in the middle. Conversely, when one part is "right under" another part, it means that there is no other part in the middle.

Spatially relative terms "below", "beneath", "lower", "above", "upper", etc., as shown in the figure It may be used to easily describe the correlation between the device or components and other devices or components. Spatially relative terms should be understood as terms including different directions of the device during use or operation in addition to the directions shown in the drawings. For example, if an element shown in the figure is turned over, an element described as “below” or “beneath” of another element may be placed “above” another element. Accordingly, the exemplary term “below” may include both directions below and above. The device may be oriented in other directions, and thus spatially relative terms may be interpreted according to the orientation.

In this specification, when a part is said to be connected to another part, this includes not only the case of being directly connected but also the case of being electrically connected with another element interposed therebetween. In addition, when a part includes a certain component, it means that other components may be further included rather than excluding other components unless otherwise indicated.

In the present specification, terms such as first, second, and third may be used to describe various elements, but these elements are not limited by the terms. The terms are used for the purpose of distinguishing one component from other components. For example, without departing from the scope of the present invention, a first component may be referred to as a second or third component, and similarly, a second or third component may be alternately named.

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

Hereinafter, an apparatus and method for automatically converting a power supply tap of a transformer according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram schematically showing a main configuration of an apparatus for automatically converting a power supply tap for a transformer according to an embodiment of the present invention.

Referring to FIG. 1, the transformer power tap automatic conversion device 100 according to an embodiment of the present invention includes a coil winding unit 110, a voltage detection unit 120, a control unit 130, and a switching unit 140. I can.

The coil winding unit 110 includes a primary winding having first to Nth power taps respectively corresponding to a first voltage to an Nth voltage according to an input voltage, and a secondary winding for outputting a voltage to the load side.

For example, when N is 4, the first voltage may be 0V, the second voltage may be 600V, the third voltage may be 1200V, and the fourth voltage may be 1800V. Accordingly, the first to Nth power taps may be 0V power taps, 600V power taps, 1200V power taps, and 1800V power taps.

In addition, the input side voltage of the coil winding unit 110 may be 13200V or 19200V, and each voltage of the first voltage to the Nth voltage according to the input side voltage is one of 0V voltage, 600V voltage, 1200V voltage, and 1800V voltage. Can be

In addition, the voltage on the load side of the coil winding unit 110 may vary in units of 7V within a voltage of 225V to 235V.

The voltage detection unit 120 detects a voltage on the load side output from the coil winding unit 110.

When the voltage on the load side detected by the voltage detector 120 fluctuates, the controller 130 outputs a command for switching to a power tap corresponding to the changed voltage.

For example, when the voltage on the load side is detected to be 235V or more, the control unit 130 outputs a command to switch to the power tap corresponding to the voltage on the load side 230V to the switching unit 140 so that the voltage on the load side becomes 230V. I can.

The switching unit 140 switches to the corresponding power tap according to the power tap switching command of the control unit 130. Here, the switching unit 140 may include a relay RLY and a thyristor SCR.

The transformer power tap automatic conversion device 100 according to an embodiment of the present invention may further include an AC/DC power supply unit, a DC/DC power supply unit, and ISO I/O, although not illustrated in FIG. 1. Since these configurations are devices generally used in the same technical field, detailed descriptions thereof will be omitted.

2 is a diagram showing an example of a configuration of a switching unit according to an embodiment of the present invention.

Referring to FIG. 2, the switching unit 140 according to an embodiment of the present invention includes a relay (RLY) and a thyristor (SCR) for each tap, and a 0V power tap (HK1) and a first relay (RLY1), A 1200V power tap HK2 and a second relay RLY2, a 600V power tap HK3/1800V power tap and a third relay RLY3 may be included.

Each thyristor (SCR) operates as generally operated in the same technical field, and may be configured and operated for each channel (SCR_CH1, SCR_CH2).

In addition, the thyristor (SCR) may be, for example, TRIAC. Thyristor is a silicon-controlled rectifying device, which is compact, has a fast response speed, can control large electric power with a small pressure, and has a semi-permanent and hard lifespan, so it is used for power system control.

3 is a block diagram schematically showing the configuration of a transformer power tap automatic conversion device according to another embodiment of the present invention.

Referring to FIG. 3, an apparatus 200 for automatically converting a power tap of a transformer according to another embodiment of the present invention includes a coil winding unit 110 and a voltage detecting unit 120 as a configuration for converting a tap of a transformer at a remote location. , A control unit 130, a switching unit 140, a communication unit 150, and a remote control device 160.

Here, the coil winding unit 110, the voltage detection unit 120, the control unit 130, and the switching unit 140 have the same configuration and operation as described in FIG. 1.

The communication unit 150 is for communicating with an external device, and transmits and receives data to and from the remote control device 160 through a communication network.

When the remote control device 160 receives the changed voltage data from the load side through the communication unit 150 at a remote location, it displays on the screen or outputs it as a voice so that the user can check it. Sends a command to switch to the power tap corresponding to the changed voltage.

That is, the control unit 130 transmits the voltage value of the load side detected through the voltage detection unit 120 to the remote control device 160 through the communication unit 150, and the changed voltage at the load side from the remote control device 160 The command to switch to the power tap corresponding to is received and applied to the switching unit 140.

Here, when the remote control device 160 is a smart terminal carried by a user, a transformer remote control application is installed in the smart terminal, and the user can check the voltage fluctuation on the load side through the transformer remote control application, and tap accordingly. By selecting and controlling the conversion, tap change corresponding to each fluctuation value is set in advance, a tap change command is automatically transmitted according to the voltage fluctuation on the load side, and the corresponding tap change completion state can be received and checked.

4 is a diagram illustrating an operation flow chart for explaining a method of automatically converting a power supply tap of a transformer according to an embodiment of the present invention.

Referring to FIG. 4, the transformer power tap automatic conversion apparatus 100 according to an embodiment of the present invention detects a voltage on the load side by the voltage detector 120 (S410).

At this time, the voltage detection unit 120 includes an analog/digital converter, converts the detected voltage of the load side into digital data through this, and transmits the converted voltage to the control unit 130.

Subsequently, the control unit 130 determines whether the voltage on the load side detected through the voltage detection unit 120 fluctuates (S420).

For example, the controller 130 may determine whether the voltage on the load side fluctuates within 225V to 235V in units of 7V from one voltage to another voltage, or fluctuates in a voltage of 235V or more.

Subsequently, when there is a change in the voltage on the load side, the control unit 130 outputs a command for switching to a power tap corresponding to the changed voltage to the switching unit 140 (S430).

For example, the control unit 130 may output a command to switch to one of the OV power tap, 600V power tap, 1200V power tap, and 1800V power tap to the switching unit 140 for the power tap corresponding to the changed voltage. I can.

Accordingly, the switching unit 140 switches to the corresponding power tap according to the power tap switching command received from the control unit 130 (S440).

That is, the switching unit 140 drives a relay element and a thyristor (SCR) element for switching to an OV power tap or a relay for switching to a 600V power tap according to a power tap switching command of the controller 130 By driving a device and a thyristor (SCR) device, or a relay device and a thyristor (SCR) device for conversion to a 1200V power tap, or a relay device and a thyristor (SCR) device for conversion to a 1800V power tap, Switching can be switched.

5 is a view showing an example of the configuration of a transformer power tap automatic conversion device according to another embodiment of the present invention.

In the transformer power tap automatic conversion device 500 according to another embodiment of the present invention, an operator or manager installs a transformer management application on the user terminal 510 carried by the operator or the administrator, and voltage fluctuations on the load side through the transformer management application Upon receiving, the transformer tap-changing device automatically converts to a power tap corresponding to a voltage fluctuation on the load side through tagging of the user terminal 510.

5, a transformer power tap automatic conversion device 500 according to another embodiment of the present invention includes a user terminal 510, a dual interface NFC tag device 520, and a transformer tap change device 530. .

Here, the transformer tap-changing device 530 refers to the transformer power tap automatic conversion device 100 described in FIG. 1, and will be referred to as a “transformer tap-changing device” for convenience.

The user terminal 510 is a terminal carried by an administrator or an operator, and has an NFC (Near Field Communication) module therein, and performs NFC tagging when the user approaches the dual interface NFC tag device 520.

In addition, the user terminal 510 has a transformer management application installed, through which the voltage fluctuation of the load side is received and displayed, or a transformer tap change command is transmitted through the tagging operation through the dual interface NFC tag device 520. Send to 530.

The dual interface NFC tag device 520 interlocks with the transformer tap change device 530 and includes an access address flag area in which the access address address is recorded, and shares it with the transformer tap change device 530 and the user terminal 510.

In addition, when the user terminal 510 checks the access address address recorded in the access address flag area and writes a tap change command in the data area of the access address address, the dual interface NFC tag device 520 The tap change command may be read from and transmitted to the transformer tap change device 530.

Here, the user terminal 510 may also be referred to as a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, a user device, or a user equipment (UE). .

User terminal 510 includes a cellular phone, a wireless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless access capability, a computing device or a wireless modem. It may be another processing device connected to. However, the user terminal 510 is not limited to these terms. The user terminal 510 should be understood as any device including an NFC module that is an active device for wireless short-range communication with the dual interface NFC tag device 520. The user terminal 510 performs short-range wireless communication with the dual interface NFC tag device 520 through the antenna 610 of the dual interface NFC tag device 520.

6 is a diagram schematically showing the configuration of a dual interface NFC tag device according to another embodiment of the present invention.

6, a dual interface NFC tag device 520 according to another embodiment of the present invention includes an antenna unit 610, a first memory unit 620, a port unit 630, and a main control unit (MCU: Main Control Unit) 640.

The antenna unit 610 performs a radio frequency (RF) interface with the user terminal 510 to transmit and receive data in a contactless manner. That is, the antenna unit 610 for the RF interface enables transmission and reception of data as if a wire is connected to a signal according to a radio frequency in the air. To this end, the antenna unit 610 supports wireless short-range (eg, 10 cm) communication. In addition, the antenna unit 610 is configured as a loop antenna, and the loop antenna may be implemented as a PCB, an FPCB, or a general conductor.

The first memory unit 620 records the access address flag area 622 in which the tap change command is written and the number of write counts is recorded, and the tap change command. It includes a data area 624 for doing so. Accordingly, since the first memory unit 620 may be implemented on an integrated circuit (IC), it may be referred to as a'dual interface NFC tag IC'. The first memory unit 620 having the data area 624 for data storage is generally a nonvolatile memory (NVM) and may be, for example, an Electrically Erasable Programmable Read-Only Memory (EEPROM). When implemented as an EEPROM, internal data is erased by applying an electrical signal to the first memory unit 620, so that a dedicated eraser for data deletion is not required, and recording and deletion are performed using a single writer. Can be done. This EEPROM may have a limit of the number of repetitions of about 1 million times. Therefore, if the storage area of the address address is no longer available due to the limitation of the number of recordings, another storage area needs to be secured. In the present invention, the storage area is secured by allocating another access address address that is not used. Is to do.

The port unit 630 includes a first port for recognizing tagging of the user terminal 510, a second port for recognizing data recording from the user terminal 510, and a transformer tap change device 530, And a third port for transmitting and receiving a tap change command. That is, the first port for recognizing tagging of the user terminal 510 for the dual interface NFC tag may include, for example, an energy harvest field detection (EH_FD) port. The second port for recognizing the recording of the dual interface NFC tag from the user terminal 510 may include, for example, a radio frequency write in progress (RF_WIP) port.

In addition, the port unit 630 for wired communication may include other ports in addition to the aforementioned ports. That is, ports for receiving data from the transformer tap change device 530 may also be included. For example, in the case of I2C wired communication, the transformer tap change device 530 records data in the first memory unit 620 through wired communication through a serial clock (SCL) port and/or a serial data (SDA) port. can do.

The main control unit 640, when the signal waveform is toggle-up (Toggle-up) and toggle-down (Toggle down) in the first port, and when the toggle-up is detected again after a predetermined time elapses, the user terminal 510 When the tagging of is recognized and the signal waveform toggle-up in the second port is toggle-down and the toggle-up is detected again, it is recognized as a recording operation of the data area, and a tap change command is read from the corresponding access address to the third port. Transmitted to the transformer tap-changing device 530 through, the number of times the tap-changing command is written to the data area may be counted.

In addition, the main control unit 640, when the interrupt signal is toggle-up from low to high and a predetermined time for determining validity of tagging elapses, the user terminal 510 It can be recognized by tagging.

Further, the main control unit 640 may recognize that the tagging of the user terminal 510 is released when the interrupt signal toggles down from high to low and a predetermined time for determining the end of the event elapses.

In addition, the main control unit 640, when the interrupt signal is toggle-down from high to low and toggle-up from low to high again within a predetermined time, the user terminal 510 for the first memory 620 It can be recognized as data write.

In addition, the main control unit 640, when the user terminal 510 is tagged, the signal waveform is toggled-up at the first port, and the user terminal 510 is interfaced with the user terminal 510 through the antenna unit 610. ) Reads the access address address from the access address flag area 622 and writes a tap change command to the access address address of the data area 624, the toggle-up signal waveform at the second port is toggled down. When the toggle-up is detected again, it is recognized as a write operation of the data area, a tap change command is read from a corresponding access address, and transmitted to the transformer tap change device 530 through a third port.

In addition, the main control unit 640 includes a second memory unit 642 for temporarily recording the number of times the tap change command is written to the data area, and count information on the number of times the tap change command is written. It includes a third memory unit 644 for recording. In this case, the second memory unit 642 may be implemented as, for example, SRAM, and the third memory unit 644 may be implemented as, for example, a Flash memory.

Also, when the main control unit 640 recognizes that the tap change command is recorded in the access address address of the data area by the user terminal 510, the first memory unit 620 records the data area 624 The number of times may be counted and written to the second memory unit 642.

In addition, when the main control unit 640 recognizes power off or drop (PWR_FAIL), the count value for the number of writes of the second memory unit 642 is determined by the third memory unit 644 or It is possible to write to the access address flag area 622 of the first memory unit 620.

In addition, when the main control unit 640 operates again in proximity to the user terminal 510, the count value for the number of writes of the third memory unit 644 or the first memory unit 620 is calculated as the second memory unit. You can read it to (642) and count the number of writes.

Further, the main control unit 640 writes a tap change command to the access address flag area 622 of the first memory unit 620 when the number of write times of the data area is equal to or greater than the specified write count ( The access address address to be written) may be changed, and a count value for the number of write times of the second memory unit 642 may be initialized.

In addition, the main control unit 640 may change the access address by sequentially increasing or decreasing the access address flag area 622 of the first memory unit 620 or not using the first memory unit 620. The address address of the data area 624 may be changed to an access address.

In addition, the main control unit 640, when the user terminal 510 is tagged, the signal waveform is toggled-up at the first port, and the user terminal 510 is interfaced with the user terminal 510 through the antenna unit 610. ) Reads the access address address from the access address flag area 622 and writes a tap change command to the access address address of the data area 624, the toggle-up signal waveform at the second port is toggled down. When the toggle-up is detected again, it is recognized as a write operation of the data area 624, a tap change command is read from a corresponding access address, and transmitted to the transformer tap change device 530 through a third port.

In addition, the first port and the second port are coupled to each other, but are coupled to use the output of the first port as a control signal for controlling the enable and disable of the second port, and the first port And the combined signal of the second port may be used as an interrupt signal for the main control unit 640.

In addition, the main control unit 640, when the interrupt signal toggles from low to high (toggle-up) and a predetermined time for tagging validity determination elapses, the user terminal 510 It can be recognized as tagging.

In addition, the main control unit 640 may recognize that the tagging of the user terminal 510 is released when the interrupt signal toggles down from high to low and a predetermined time for determining the end of the event elapses.

In addition, the main control unit 640, when the interrupt signal is toggle-down from high to low and toggle-up from low to high again within a predetermined time, the user terminal 510 for the first memory 620 It can be recognized as data write.

In addition, the main control unit 640 may recognize an invalid operation when the interrupt signal is toggled-down from high to low and toggled back from low to high within a threshold time.

On the other hand, in the transformer power tap automatic conversion apparatus 500 according to another embodiment of the present invention, the main control unit 640 is the first memory unit 620 by an interrupt signal through a combination of the first port and the second port. It is possible to recognize the data recording operation for For interrupt, the present invention uses a combination of a first port for recognizing tagging of the user terminal 510 and a second port for recognizing data recording from the user terminal 510 to the first memory unit 620.

Here, the combination of the first port and the second port will be described with reference to FIGS. 7 and 8.

7 and 8 are circuit diagrams illustrating a combination of a first port and a second port of a dual interface NFC tag device according to another embodiment of the present invention.

In FIGS. 7 and 8, it is described that the first port is the EH_FD port and the second port is the RF_WIP port.

When the user terminal 510 is tagged to the dual interface NFC tag device 520, the IC of the dual interface NFC tag is powered by an electromagnetic field generated by the user terminal 510. This generated power is output to EH_FD of the dual interface NFC tag in FIGS. 7 and 7. The output of EH_FD may be input to the VCC port of the dual interface NFC tag and used as operation power, and may also be used as a signal for recognizing a state that the user terminal 510 is tagged.

The RF_WIP signal toggles down from high to low when data is recorded in the tagging state from the user terminal 510 to the dual interface NFC tag device 520, and goes from low to high again after a certain period of time has elapsed. This signal is toggled up to indicate that a recording has occurred.

This RF_WIP port is basically an open-drain port. Due to its nature, an open-drain port cannot generate an output without a pull-up resistor outside the port. Here, RF_WIP is a signal that cannot be generated when the EH_FD is low since the write operation occurs on the premise that the user terminal 510 is tagged.

Accordingly, in FIGS. 7 and 8, the EH_FD port and the RF_WIP port are combined so that the enable of the pull-up resistor of RF_WIP can be controlled according to the EH_FD signal. That is, in FIGS. 7 and 8, the RF_WIP output of the dual interface NFC tag IC and the output signal of the GEN INT terminal are composed of EH_FD + RF_WIP, which is a combination of EH_FD and RF_WIP.

The resistance (R11) of the output terminal of GEN INT is the collector resistance of the transistor (Q2) and the pull-up resistance of RF_WIP. If EH_FH is low in GEN INT, the output transistor Q2 becomes conductive and the EH_FD + RF_WIP node is connected to GND, so R11 does not operate as a pull-up resistor. If EH_FD is High, the output transistor Q2 is not conducting, so R11 can operate as a pull-up resistor, and EH_FD + RF_WIP is in a high state so that it can be recognized that the user terminal 510 is tagged. In this state, when data is recorded from the user terminal 510, the EH_FD + RF_WIP signal toggles low for a certain period of time and then toggles high again, so it can be seen that the write operation has occurred. .

Accordingly, the main control unit 640, when the interrupt signal is toggle-up from low to high and a predetermined time for tagging validity determination elapses, the user terminal 510 It is recognized as tagging of.

In addition, when the interrupt signal toggles from high to low and a predetermined time for determining the end of the event elapses, the main control unit 640 recognizes that the tagging of the user terminal 510 is released.

In addition, the main control unit 640, when the interrupt signal is toggle-down from high to low and toggle-up from low to high again within a predetermined time, the user terminal 510 for the first memory unit 620 It can be recognized as data write of.

In addition, the main control unit 640 may recognize an invalid operation when the interrupt signal is toggled-down from high to low and toggled back from low to high within a threshold time.

That is, in the transformer power tap automatic conversion device 500 according to another embodiment of the present invention configured as described above, the user terminal 510 carried while the user is located within 10 m from the transformer tap conversion device 530 ), from the transformer tap-changing device 530 through the transformer management application, that the voltage on the load side of the transformer has been changed from 230V to 220V. At this time, the transformer management application notifies that the voltage on the load side of the transformer has changed from 230V to 220V and simultaneously displays a message asking whether to execute a command to switch to a power tap corresponding to 230V, for example, a 600V power tap to switch back to 230V. Can give.

Accordingly, the user performs NFC tagging by bringing the user terminal 510 close to the dual interface NFC tag device 520 connected to the transformer tap change device 530 in order to transmit a command to switch to the 600V power tap corresponding to 230V. Run.

In the dual interface NFC tag device 520, the main control unit 640 toggles up the signal waveform at the first port when tagging the user terminal 510, and communicates with the user terminal 510 through the antenna unit 610. By interfacing, the user terminal 510 reads the access address address from the access address flag area 622 and writes a tap change command to the access address address of the data area 624, thereby toggle-up from the second port. When the signal waveform is toggle-down and toggle-up is detected again, it is recognized as a recording operation of the data area 624, and a tap change command is read from the corresponding access address and transferred to the transformer tap change device 530 through the third port. send.

Accordingly, the transformer tap change device 530 transmits a tap change command to the switching unit 140, and the switching unit 140 switches the power tap of the coil winding unit 110 to, for example, a 600V power tap. .

As described above, according to the present invention, according to the voltage fluctuation of the load, by selecting and driving the corresponding relay to automatically convert the power supply tap, it is possible to lower the withstand voltage characteristic of the voltage (current) control element, automatic conversion of the power supply tap of a transformer. Apparatus and method can be realized.

Although the above has been described with reference to embodiments of the present invention, various changes or modifications may be made at the level of a person skilled in the art to which the present invention pertains. Such changes and modifications can be said to belong to the present invention as long as it does not depart from the scope of the technical idea provided by the present invention. Accordingly, the scope of the present invention should be determined by the claims set forth below.

100: transformer power tap automatic conversion device according to an embodiment of the present invention
110: coil winding unit 120: voltage detection unit
130: control unit 140: switching unit
300: Transformer power tap automatic conversion device according to another embodiment of the present invention
150: communication unit 160: remote control device
500: transformer power tap automatic conversion device according to another embodiment of the present invention
510: user terminal 520: dual interface NFC tag device
530: transformer tap change device 610: antenna unit
620: first memory unit 622: access address flag area
624: data area 630: port
640: main control unit (MCU) 642: second memory unit
644: third memory unit

Claims (10)

A coil winding unit including a primary winding having first to Nth power taps respectively corresponding to a first voltage to an Nth voltage according to an input voltage, and a secondary winding for outputting a voltage to a load side;
A voltage detector for detecting a voltage on the load side;
A control unit for outputting a command for switching to a power tap corresponding to the changed voltage when the voltage on the load side detected by the voltage detection unit fluctuates;
A switching unit for switching to a corresponding power tap according to a power tap switching command of the control unit; And
An NFC tag device having an access address flag area in which an access address address is recorded;
Including,
The NFC tag device includes: a first port for recognizing tagging of a user terminal receiving a voltage fluctuation on the load side; A second port for recognizing data recording from the user terminal; And a third port for transmitting/receiving the control unit and the power tap switching command,
When the user terminal checks the access address address recorded in the access address flag area by tagging of the user terminal and writes the power tap switching command in the data area of the access address address, the NFC tag device When a signal waveform is toggle-up and toggle-down at port 1, and when a toggle-up is detected again after a certain period of time, the tagging of the user terminal is recognized, and the second port When the toggle-up signal waveform is toggle-down and the toggle-up is detected again, it is recognized as a recording operation of the data area of the access address address, and the power tap switching command is read from the access address address and passed through the third port. Transformer power tap automatic conversion device for transmitting to the control unit.
The method of claim 1,
When N is 4, the first voltage is 0V, the second voltage is 600V, the third voltage is 1200V, and the fourth voltage is 1800V.
The method of claim 1,
The switching unit, a transformer power tap automatic conversion device including a relay and a thyristor (SCR).
The method of claim 1,
The input side voltage is 13200V or 19200V,
Each voltage in the first voltage to the N-th voltage according to the input-side voltage is one of 0V voltage, 600V voltage, 1200V voltage, and 1800V voltage.
The method of claim 1,
The voltage on the load side is a voltage of 225V to 235V, the transformer power tap automatic conversion device that fluctuates in units of 7V.
The method of claim 1,
The control unit, when the voltage on the load side is detected to be 235V or higher, outputs a command to switch to a power tap corresponding to the voltage on the load side 230V to the switching unit so that the voltage on the load side becomes 230V, automatic conversion of the transformer power tap Device.
Transformer power tap including a coil winding unit having a primary winding having first to Nth power taps respectively corresponding to a first voltage to an Nth voltage according to an input voltage, and a secondary winding for outputting a voltage to a load side As an automatic conversion method,
(a) detecting a voltage on the load side by a voltage detector;
(b) determining, by a control unit, whether the voltage on the load side detected through the voltage detection unit changes;
(c) outputting, by the control unit, a command for switching to a power tap corresponding to the changed voltage to a switching unit; And
(d) switching, by a switching unit, to a corresponding power tap according to a power tap switching command of the control unit;
Including,
In the step (b), the control unit transmits the voltage fluctuation of the load side to the user terminal,
The user terminal receives the voltage fluctuation on the load side and records the power tap switching command in the data area of the access address address of the NFC tag device through a tagging operation,
The NFC tag device includes: a first port for recognizing tagging of a user terminal that has received a voltage fluctuation on the load side; A second port for recognizing data recording from the user terminal; And a third port for transmitting/receiving the control unit and the power tap switching command,
When the user terminal checks the access address address by tagging of the user terminal and records the power tap switching command in the data area of the access address address, the NFC tag device toggles the signal waveform at the first port- When a toggle-up is detected again after a certain period of time has elapsed, the tagging of the user terminal is recognized, and the signal waveform toggled-up in the second port is toggle- When down and toggle-up is detected again, the power tap of the transformer recognizes as a recording operation of the data area of the access address address, reads the power tap switching command from the access address address, and transmits it to the controller through the third port Automatic conversion method.
The method of claim 7,
In the step (b), the control unit determines whether the voltage on the load side changes from one voltage to another voltage in units of 7V within 225V to 235V, or changes to a voltage of 235V or more.
The method of claim 7,
In the step (c), the control unit outputs a command to switch the power tap corresponding to the changed voltage to one of an OV power tap, a 600V power tap, a 1200V power tap, and a 1800V power tap to the switching unit. Automatic conversion method.
The method of claim 7,
In the step (d), the switching unit drives a relay device for switching to an OV power tap and a thyristor (SCR) device, or a relay device for switching to a 600V power tap according to a power tap switching command of the control unit. Switching by driving a thyristor (SCR) device or a relay device and a thyristor (SCR) device for conversion to a 1200V power tap, or a relay device and a thyristor (SCR) device for conversion to a 1800V power tap Switching, transformer power tap automatic conversion method.

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