KR102313484B1 - Mobile X RAY Apparatus - Google Patents

Abstract

A mobile X-ray apparatus according to an exemplary embodiment of the present disclosure includes an X-ray irradiator for irradiating X-rays; a battery for supplying power to the X-ray irradiation unit; a charging unit for charging the battery; BMS receiving power from a battery or a charging unit and outputting a first signal based on the state of the battery; It includes; a first switch that is turned off according to a first signal to cut off the power supplied to the BMS, and the first switch is turned on by the power supplied from the charging unit when the power of the BMS is cut off to supply power to the BMS. have.

Description

Mobile X-ray Apparatus {Mobile X RAY Apparatus}

The present disclosure relates to a mobile X-ray device including a lithium ion battery.

X-ray is an electromagnetic wave with a wavelength of 0.01 to 100 angstroms (Å) in general, and has a property of penetrating an object, so it is generally used in medical equipment for imaging the inside of a living body or non-destructive testing equipment in general industry. It can be widely used.

An X-ray apparatus using X-rays may transmit X-rays emitted from an X-ray source to an object, and an X-ray detector may detect a difference in intensity of the transmitted X-rays to obtain an X-ray image of the object. The X-ray apparatus may identify an internal structure of the object and diagnose the object with the X-ray image. The X-ray apparatus has an advantage in that the internal structure of the object can be easily grasped by using the principle that the transmittance of X-rays varies according to the density of the object and the atomic number of atoms constituting the object.

When the wavelength of the X-ray is short, the transmittance increases and the screen becomes clear (brightness).

Meanwhile, in the X-ray apparatus, an X-ray irradiator and an X-ray detector are fixed in a predetermined space. Therefore, in order to perform X-ray imaging, the patient must move to an examination room in which the X-ray apparatus is located.

However, a mobile X-ray apparatus capable of performing X-ray imaging regardless of location has been developed because it is difficult for a patient with reduced mobility to perform X-ray imaging with a general X-ray apparatus.

Since the mobile X-ray apparatus is equipped with an X-ray irradiator in a movable body and uses a portable X-ray detector, it is possible to directly visit a patient with reduced mobility and perform X-ray imaging.

The present disclosure provides an apparatus for waking up the BMS by supplying power to the BMS in a state in which a battery management system (BMS) is shut down.

A mobile X-ray apparatus according to an exemplary embodiment of the present disclosure includes: a battery for supplying power to an X-ray irradiation unit; a charger for charging the battery; a battery management system (BMS) that detects at least one of a voltage and a temperature of the battery to determine a state of the battery, and outputs a first signal (shut down signal) based on the determined state of the battery; a DC-DC converter that converts power supplied from the battery into driving power for driving the BMS; and a first switch (FET) that is turned off according to a first signal to cut off power supplied to the DC-DC converter, wherein the BMS is shut down as the first switch is turned off, and the first switch is the BMS In the shutdown state, it may be switched to the on state by power supplied from the charging unit. In addition, the mobile X-ray apparatus further includes a second switch, wherein the second switch is turned on based on a first signal output from the BMS. Alternatively, it may be turned off, and the first switch may be turned on as the second switch is turned on.

In addition, the BMS may be characterized in that it outputs the driving power of the second switch.

In addition, the second switch may be characterized in that the BMS is turned off in the shutdown state.

In addition, the BMS outputs a third signal, and the first switch may be turned on by the third signal.

In addition, the mobile X-ray apparatus may further include a third switch, wherein the third switch is turned on by power supplied from the charging unit in a state in which the BMS is shut down.

In addition, the mobile X-ray apparatus further includes a fourth switch, the fourth switch maintains an on state when there is no driving power, and one side of the fourth switch is connected to the third switch to control the third switch can be done with

In addition, the BMS may be characterized in that it outputs the driving power of the fourth switch.

In addition, the mobile X-ray apparatus further includes a discharge FET, the discharge FET is controlled to be on or off based on a signal output from the BMS, is turned on when the battery is discharged, and is turned on when the battery is charged It may be characterized in that it is off.

In addition, when the discharge FET is turned off, a current path may be formed from the negative terminal of the battery to the charging unit.

In addition, the mobile X-ray apparatus further includes a charging FET, and the charging FET is controlled to be on or off based on a signal output from the BMS, and is turned on when charging the battery and on when discharging the battery. It may be characterized in that it is off.

In addition, when the charging FET is turned off, it may be characterized in that a current path is formed from the X-ray irradiator to the negative terminal of the battery.

Also, the battery may be a lithium ion battery.

A mobile X-ray apparatus according to another embodiment of the present disclosure includes: an X-ray irradiator for irradiating X-rays; a battery for supplying power to the X-ray irradiation unit; BMS (Battery Management System) that shuts down based on the state of the battery; and a charging unit for supplying power to the battery and the BMS, wherein the BMS may wake up when power is supplied from the charging unit in a shut-down state.

In addition, the mobile X-ray apparatus further includes a physical switch exposed to the outside, and may be woken up by the physical switch when the BMS is shut down.

According to an embodiment, the mobile X-ray apparatus can wake up the BMS in the shutdown state by disconnecting the AC power cord mounted on the main body from the outlet and then inserting it again without a separate switch.

As another example, the mobile X-ray apparatus may have a wake-up switch mounted on the main body, and may wake up the BMS in a shutdown state by using the switch.

1A to 1C are external views illustrating a mobile X-ray apparatus.
2 is an external view of the X-ray detector.
3 is a block diagram of an X-ray apparatus according to an exemplary embodiment.
4 is a detailed block diagram of a power supply unit of a mobile X-ray apparatus according to an exemplary embodiment.
5 shows an embodiment in which a lithium ion battery is discharged.
6 shows an embodiment in which a lithium ion battery is charged.
7 is a detailed block diagram of a mobile X-ray apparatus according to an exemplary embodiment.
8 illustrates a shutdown process of a mobile X-ray apparatus according to an exemplary embodiment of the present disclosure.
9 and 10 illustrate a shutdown circuit and peripheral components thereof according to an exemplary embodiment of the present disclosure.

Hereinafter, various embodiments of the present disclosure will be described with reference to the accompanying drawings. Examples and terms used therein are not intended to limit the technology described in the present disclosure to specific embodiments, and should be understood to include various modifications, equivalents, and/or substitutions of the embodiments. In connection with the description of the drawings, like reference numerals may be used for like components.

The singular expression may include the plural expression unless the context clearly dictates otherwise. In the present disclosure, expressions such as “A or B” or “at least one of A and/or B” may include all possible combinations of items listed together. Expressions such as "first," "second," "first," or "second," can modify the corresponding elements, regardless of order or importance, and to distinguish one element from another element. It is used only and does not limit the corresponding components. When an (eg, first) component is referred to as being “connected (functionally or communicatively)” or “connected” to another (eg, second) component, that component is It may be directly connected to the component or may be connected through another component (eg, a third component).

In the present disclosure, "configured (or configured to)" means "suitable for," "having the ability to," "modified to, ," "made to," "capable of," or "designed to" may be used interchangeably. In some circumstances, the expression “a device configured to” may mean that the device is “capable of” with other devices or parts. For example, the phrase “a processor configured (or configured to perform) A, B, and C” refers to a dedicated processor (eg, an embedded processor) for performing the operations, or by executing one or more software programs stored in a memory device. , may refer to a general-purpose processor (eg, a CPU or an application processor) capable of performing corresponding operations.

In the present disclosure, a “user” may mean a person who operates the mobile X-ray apparatus. Also, the “user” may refer to a device (eg, an artificial intelligence electronic device or a robot, etc.) that performs manipulation of the mobile X-ray device.

As used herein, the term 'part' (part, portion) may be implemented in software or hardware, and according to embodiments, a plurality of 'parts' may be implemented as one element (unit, element), or one ' It is also possible for part' to include a plurality of elements.

In the present specification, the image may include a medical image obtained by a medical imaging apparatus such as a magnetic resonance imaging (MRI) apparatus, a computed tomography (CT) apparatus, an ultrasound imaging apparatus, or an X-ray imaging apparatus.

In the present specification, an 'object' is a subject to be photographed, and may include a person, an animal, or a part thereof. For example, the object may include a body part (such as an organ or an organ) or a phantom.

Hereinafter, the working principle and embodiments of the present invention will be described with reference to the accompanying drawings.

1A to 1C are external views illustrating a mobile X-ray apparatus.

Referring to FIG. 1A , the X-ray apparatus 100 includes an X-ray irradiation unit 110 for generating and irradiating X-rays, an input unit 151 for receiving a command from a user, a display unit 152 for providing information to the user, and an input command. Accordingly, the control unit 120 controls the mobile X-ray apparatus 100 and the communication unit 140 communicates with an external device.

The X-ray irradiation unit 110 may include an X-ray source that generates X-rays and a collimator that adjusts an irradiation area of X-rays generated from the X-ray source.

When the X-ray apparatus 100 is implemented as a mobile X-ray apparatus, the main body 101 to which the X-ray emitter 110 is connected can move freely, and the arm 103 that connects the X-ray emitter 110 and the main body 101 also rotates and Since linear movement is possible, the X-ray irradiator 110 can be freely moved in a three-dimensional space.

The input unit 151 may receive a command for controlling an imaging protocol, imaging conditions, imaging timing, position control of the X-ray irradiator 110 , and the like. The input unit 151 may include a keyboard, a mouse, a touch screen, a voice recognizer, and the like.

The display 152 may display a screen for guiding a user's input, an X-ray image, a screen indicating the state of the X-ray apparatus 100, and the like.

The controller 120 may control the imaging timing and imaging conditions of the X-ray radiator 110 according to a control command input from the user, and may generate a medical image using the image data received from the X-ray detector 200 . have. Also, the controller 120 may control the position or posture of the X-ray irradiator 110 according to the imaging protocol and the position of the object.

The controller 120 may include a memory in which a program for performing the above-described operation and an operation to be described later is stored and a processor for executing the stored program. The controller 120 may include a single processor or a plurality of processors. In the latter case, the plurality of processors may be integrated on one chip or physically separated.

A storage unit 105 for storing the X-ray detector 200 may be provided in the main body 101 . In addition, a charging terminal capable of charging the X-ray detector 200 is provided inside the storage unit 105 , so that the X-ray detector 200 can be stored while charging can be performed.

The input unit 151 , the display unit 152 , the control unit 120 , and the communication unit 140 may be provided in the main body 101 , and the image data acquired by the X-ray detector 200 is transmitted to the main body 101 to obtain an image. After the processing, it may be displayed on the display unit 152 or transmitted to an external device through the communication unit 140 .

Also, the control unit 120 and the communication unit 140 may be provided separately from the main body 101 , and only some of the components of the control unit 120 and the communication unit 140 may be provided in the main body 101 .

The X-ray apparatus 100 is connected to an external device (eg, an external server 31 , a medical device 32 and a portable terminal 33 (smartphone, tablet PC, wearable device, etc.)) through the communication unit 140 . data can be sent or received.

The communication unit 140 may include one or more components that enable communication with an external device, and may include, for example, at least one of a short-range communication module, a wired communication module, and a wireless communication module.

Alternatively, the communication unit 140 receives a control signal from an external device and transmits the received control signal to the control unit 120 so that the control unit 120 controls the X-ray apparatus 100 according to the received control signal. possible.

In addition, the control unit 120 transmits a control signal to the external device through the communication unit 140 , so that it is possible to control the external device according to the control signal of the control unit. For example, the external device may process data of the external device according to a control signal of the controller 120 received through the communication unit 140 .

Also, the communication unit 140 may further include an internal communication module that enables communication between components of the X-ray apparatus 100 . A program for controlling the X-ray apparatus 100 may be installed in the external device, and the program may include a command for performing some or all of the operations of the controller 120 .

The program may be pre-installed in the portable terminal 33, and it is also possible for a user of the portable terminal 33 to download and install the program from a server that provides an application. The server providing the application may include a recording medium in which the corresponding program is stored.

Also, the communication unit 140 may further include an internal communication module that enables communication between components of the X-ray apparatus 100 .

Meanwhile, the main body 101 may be equipped with an AC power cord 750 and/or a switch 716 . A user may wake up the shut down BMS by connecting the AC power cord 750 to an outlet (not shown) in a state in which the BMS (Battery Management System) is shut down. In addition, the user can wake up the shut down BMS by pressing the switch 716 while the BMS is shut down.

According to the embodiment, the main body 101 may use one of the AC power cord 750 or the switch 716 to wake up the BMS in the shutdown state.

Referring to FIG. 1B , the main body 101 has an AC power cord 750 , and the switch 716 is not mounted thereon. In this case, the user can wake up the shutdown BMS by connecting the AC power cord 750 to an outlet (not shown).

Referring to FIG. 1C , a switch 716 is mounted on the main body 101 . In this case, the user can wake up the shut down BMS by pressing the switch 716 while the BMS is shut down. The switch 716 may be disposed outside the X-ray detector storage unit or on the side of the body.

2 is an external view of the X-ray detector.

As described above, the X-ray detector 200 used in the X-ray apparatus 100 may be implemented as a portable X-ray detector. In this case, the X-ray detector 200 may operate wirelessly including a battery for supplying power, and as shown in FIG. 2 , the charging port 201 is connected to a separate power supply and a cable (C). and may work.

Inside the case 203 forming the exterior of the X-ray detector 200, a detection element that detects X-rays and converts them into image data, a memory that temporarily or non-temporarily stores image data, and a control signal from the X-ray apparatus 100 A communication module for receiving or transmitting image data to the X-ray apparatus 100 and a battery may be provided. Also, image correction information of the detector and unique identification information of the X-ray detector 200 may be stored in the memory, and the stored identification information may be transmitted together when communicating with the X-ray apparatus 100 .

3 is a block diagram of an X-ray apparatus according to an exemplary embodiment.

The X-ray apparatus 100 may include an X-ray irradiation unit 305 , a control unit 310 , a power supply unit 320 including a lithium ion battery 322 , and a charging unit 330 . The X-ray apparatus 100 may include a high voltage generator (not shown) provided in the body. The X-ray apparatus shown in FIG. 3 may be implemented as a mobile X-ray apparatus as shown in FIG. 1A, and only components related to the present embodiment are illustrated. Accordingly, it can be understood by those of ordinary skill in the art related to the present embodiment that other general-purpose components may be further included in addition to the components shown in FIG. 3 .

The X-ray irradiator 305 may include the contents of the X-ray irradiator 110 of FIG. 1A , and overlapping contents will be omitted. In addition, since the control unit 310 may include the contents of the control unit 120 of FIG. 1A , overlapping contents will be omitted.

The power supply unit 320 may supply power to a load through the lithium ion battery 322 . The load may include various components to which power of the X-ray apparatus 100 is supplied, such as, for example, the X-ray radiator 305 and the controller 310 . That is, the battery 322 may supply operating power to the X-ray irradiator 305 and the controller 310 .

Also, the power supply unit 320 may supply operating power to each component requiring operating power in the X-ray apparatus 100 through the lithium ion battery 322 . For example, the power supply unit 320 may supply operating power to the input unit 151 , the display unit 152 , and the communication unit 140 of the X-ray apparatus 100 through the lithium ion battery 322 .

The power supply unit 320 may control the overcurrent generated during X-ray irradiation by the X-ray irradiation unit 305 . In other words, as the X-ray irradiator 305 irradiates X-rays, an overcurrent, which is a current higher than a normal use current, may flow in the power supply unit 320 , and the power supply unit 320 may control the overcurrent. According to an embodiment, the power supply unit 320 may configure a circuit including a discharging FET and a charging FET configured in parallel to control overcurrent. According to another embodiment, the power supply unit 320 may configure a circuit including current sensors of different capacities for measuring the amount of discharged current to control overcurrent.

The charging unit 330 may charge the power supply unit 320 . More specifically, the charging unit 330 may supply charging power so that the lithium ion battery 322 of the power supply unit 320 is charged. In this case, the charging power may mean power generated by the charging unit 330 . According to an embodiment, the charging unit 330 may be configured to be coupled to an external power supply unit, and may receive power from the power supply unit. Subsequently, the charging unit 330 may supply charging power to the lithium ion battery 322 by controlling the received power according to a user input or an internal operation of the device.

Each of the power supply unit 320 , the charging unit 330 , and the control unit 310 may include a communication interface capable of communicating with each other. For example, each of the power supply unit 320 , the charging unit 330 , and the control unit 310 may communicate with each other according to a controller area network (CAN) through a communication interface. In addition, according to another example, communication between the power supply unit 320 , the charging unit 330 , and the control unit 310 is a high-speed digital interface such as LVDS (Low Voltage Differential Signaling), or asynchronous serial such as a universal asynchronous receiver transmitter (UART). A low-latency network protocol such as communication or erroneous synchronous serial communication may be used, and various communication methods may be used within the range apparent to those skilled in the art. In addition, the power supply unit 320 , the charging unit 330 , and the control unit Each of 310 may be configured as a modular unit separate from each other. As each of the power supply unit 320, the charging unit 330, and the control unit 310 is configured as a different modular unit, the control unit 310 does not need to directly monitor the high voltage, so a high voltage circuit can be configured in the control unit 310. There is no need, and as a result, it can be effective in terms of stability by reducing the risk factors caused by high voltage circuits.

Specifically, in a mobile X-ray device using a conventional lead-acid battery, the control unit may include a circuit for monitoring a high voltage, and thus there is a risk that the control unit may be damaged by the high voltage. Since the BMS can monitor the high voltage state and transmit the high voltage state to the control unit 310 , such a risk factor can be reduced.

In addition, as each of the power supply unit 320 , the charging unit 330 , and the control unit 310 is configured in different modularized units, the power supply unit 320 , the charging unit 330 , and the control unit 310 are different from each other in the mobile X-ray apparatus. Since it can be used in , a common platform design may be possible. In addition, as each of the power supply unit 320 , the charging unit 330 , and the control unit 310 is configured as a different modular unit, the power supply unit 320 , the charging unit 330 , and the control unit 310 are provided with a shield case, respectively. ) to prevent EMI (Electro Magnetic Interference)/EMC (Electro Magnetic Compatibility) noise that may occur with each other.

4 is a detailed block diagram of a power supply unit of a mobile X-ray apparatus according to an exemplary embodiment.

The power supply unit 320 may include a lithium ion battery 322 , a battery management system (BMS) 410 , a discharging field effective transistor (FET) 430 , and a charging FET 440 . In the power supply unit 320 shown in FIG. 4, only the components related to this embodiment are shown. In addition, the power supply unit 320 may include a voltage sensor (not shown) for sensing a voltage and a temperature sensor (not shown) for sensing a temperature. Accordingly, it can be understood by those of ordinary skill in the art related to the present embodiment that other general-purpose components may be further included in addition to the components shown in FIG. 4 .

The lithium ion battery 322 is a type of secondary battery and may be divided into three parts, such as a positive electrode, a negative electrode, and an electrolyte. For example, lithium cobalt oxide or lithium iron phosphate (LiFePO4) may be used as the positive electrode, and graphite may be used as the negative electrode. The lithium ion battery 334 may have a structure in which a plurality of battery cells are connected and combined. For example, the lithium ion battery 322 may be configured with 88 series and 4 parallel combinations, for a total of 352 cells.

In addition, the lithium ion battery 334 may be suitable for use in a mobile X-ray device because of its relatively small size and weight compared to a conventional lead-acid battery. For example, the total weight of the power supply unit 320 including the lithium ion battery 334 and the peripheral circuit may be 33.2 kg, which may be less than the 35 kg limit of the air transport regulations. Accordingly, the power supply unit 320 may be transported by air in a single unit state.

The X-ray apparatus 100 supplies power to the X-ray radiator 305 using a battery, and may include a BMS 410 that operates a protection circuit by checking the voltage and temperature of the battery.

The BMS 410 may determine the state of the battery by detecting the state of the voltage, temperature, etc. of the lithium ion battery 322 . According to one example, the BMS 410 may include a circuit called a battery stack monitor capable of monitoring the voltage of the lithium ion battery 322 and the battery cell temperature. The BMS 410 may control and manage the power supply 320 based on the state of the lithium ion battery 322 . In addition, the BMS 410 may control the charging path and the discharging path by controlling the on/off of the charging FET 440 and the discharging FET 430 .

Also, the BMS 410 may operate a protection circuit based on the state of the lithium ion battery 322 . In other words, the BMS 410 may operate a protection circuit to prevent a dangerous state of the lithium ion battery 322 based on the state of the lithium ion battery 322 . Specifically, the BMS 410 may operate a protection circuit for at least one of overdischarge, overcurrent, overheat, and unbalancing between battery cells based on the state of the lithium ion battery 322 .

The BMS 410 may operate a protection circuit by checking overdischarge, overcurrent, overheating, and unbalance states between battery cells based on the state of the battery, and may be shut down accordingly.

The BMS 410 may operate a protection circuit when the voltage of the lithium ion battery 322 is in an overdischarge state that is lower than a reference value. For example, the BMS 410, when the voltage of the lithium ion battery 322 drops to 275V or less, the BMS 410 itself may be turned off by operating a shutdown circuit. In addition, the BMS 410 may operate the protection circuit when the current of the lithium ion battery 322 is in an overcurrent state that becomes higher than the reference value. For example, the BMS 410 may reset (reset) itself by operating a shutdown circuit when the current of the lithium ion battery 322 is 40A or more. The BMS 410 may operate a protection circuit when the temperature of the lithium ion battery 322 is in an overheating state that is higher than a reference value. For example, when the temperature of the lithium ion battery 322 is 70 degrees or more, the BMS 410 may operate a protection circuit to block the charging and discharging paths. The BMS 410 may operate a protection circuit when the lithium ion battery 322 is in an unbalanced state between cells. For example, the BMS 410 operates a shutdown circuit to turn off the BMS 410 itself when the voltage difference between cells of the lithium ion battery 322 is 0.5V or more and continues for 10 seconds or more. .

The BMS 410 may communicate with the control unit 310 through a communication interface in relation to the state of the power supply unit 320 .

The load 406 may be powered via a charging path and/or a discharging path.

The discharge FET 430 may include a plurality of FETs in parallel. When X-rays are irradiated by the X-ray irradiation unit 305 , an overcurrent may flow in the power supply unit 320 , so that the discharge FET 430 may include FETs having a predetermined capacity in parallel. That is, FETs of a predetermined capacity are connected in parallel to increase the current allowable capacity of the discharge FET 430 . For example, when X-ray irradiation by the X-ray irradiator 305, an overcurrent of 300A or more may flow in the power supply unit 320, so that it can handle an overcurrent of 300A or more, the discharge FET 430 includes four 100A FETs in parallel It may be configured to be connected to

The discharging FET 430 and the charging FET 440 may be configured as N-channel FETs according to an example.

The discharging FET 430 and the charging FET 440 may control the path of a discharging current or a charging current when the lithium ion battery 322 is discharged or charged. According to an embodiment, when the lithium ion battery 322 is discharged, the charging FET 440 may be turned off, and a discharge current loop through the discharging FET 430 may be formed. According to another embodiment, when the lithium ion battery 322 is being charged, the discharge FET 430 may be turned off, and the charging current through the body diode of the discharge FET 430 and the charging FET 440 . A loop may be formed. In addition, the lithium ion battery 322 may be simultaneously discharged or charged through the discharge FET 430 and the charge FET 440 .

In addition, although the load 406 receiving power from the lithium ion battery 332 is illustrated as including the control unit 310 and the X-ray irradiation unit 305 , the load 406 is powered from the X-ray apparatus 100 . It may further include each component that requires

5 shows an embodiment in which a lithium ion battery is discharged.

The discharge FET 430 may be controlled to be on or off based on a signal output from the BMS 410 . The discharge FET 430 may be turned on when the lithium ion battery 322 is discharged, and may be turned off when the battery 322 is being charged. The signal may be coupled to the gate terminal of the discharge FET 430 . When the discharge FET 430 is turned off, a current path may be formed from the negative terminal of the lithium ion battery 322 to the charging unit through the body diode.

Specifically, when the lithium ion battery 322 is discharged, the source (S) voltage of the charging FET 440 is higher than the drain (D) voltage, so that the charging FET 440 may be turned off. In addition, when the lithium ion battery 322 is discharged, the drain (D) voltage of the discharge FET 430 is higher than the source (S) voltage, so that the discharge FET 430 may be turned on.

Thus, a clockwise discharge current loop can be formed in which the discharge current passes through the load 406 , the discharge FET 430 , and the lithium ion battery 322 , as shown in FIG. 5 . Also, even when the charging FET 440 is turned off, the discharging of the lithium ion battery 322 may operate normally.

* Figure 6 shows an embodiment in which a lithium ion battery is charged.

The charging FET 440 is controlled to be on or off based on a signal output from the BMS 410, and may be turned on when charging the lithium ion battery 322 and turned off when discharging the battery. have. Charge FET 440 may form a current path from load 406 to the negative terminal of battery 322 when off.

Specifically, when the lithium ion battery 322 is charged, the source (S) voltage of the discharge FET 430 is higher than the drain (D) voltage, so that the discharge FET 430 may be turned off. Since the discharge FET 430 is turned off, a charging current may flow through the body diode of the discharge FET 430 . In addition, when the lithium ion battery 322 is charged, the drain (D) voltage of the charging FET 440 is higher than the source (S) voltage, so that the charging FET 440 may be turned on.

Accordingly, as shown in FIG. 6 , the charging current flows counterclockwise through the charging unit 330 , the lithium ion battery 322 , the body diode of the discharging FET 430 , and the charging FET 440 . A loop may be formed. Also, even when the discharge FET 430 is turned off, the charging of the lithium ion battery 322 may operate normally.

7 is a detailed block diagram of a mobile X-ray apparatus according to an exemplary embodiment.

The power supply unit 320 includes a lithium ion battery 322 , a BMS 410 , a discharging FET 430 , a charging FET 440 , a shut down circuit 710 , a first current sensor 730 , and a first 2 may include a current sensor 740 , a DC-DC converter 720 , and a fuse 760 . Also, the X-ray apparatus 100 may include a third current sensor 751 . Lithium-ion battery 322, BMS 410, discharge FET 430, and charge FET 440 are the lithium-ion battery 322, BMS 410, discharge FET 430, and charge FETs of FIG. 440), and thus a redundant description will be omitted. The first and second current sensors 730 and 740 may include Hall sensors, and the shutdown circuit 710 as a protection circuit may include a switching circuit such as an FET.

The BMS 410 may sense the current of the lithium ion battery 322 using different current sensors 730 and 740 . The BMS 410 may sense a current flowing through the lithium ion battery 322 using the first current sensor 730 . The first current sensor 730 may be a small-capacity sensor for sensing a relatively low-intensity current. In other words, the first current sensor 730 may be a sensor for detecting a current having an intensity equal to or less than a reference value. For example, the first current sensor 730 may be a sensor for detecting a current of 50A or less. Also, when an overcurrent flows through the lithium ion battery 322 , the BMS 410 may detect the overcurrent flowing through the lithium ion battery 322 using the second current sensor 740 . The second current sensor 740 may be a large-capacity sensor for sensing a relatively high-intensity current. In other words, the second current sensor 740 may be a sensor for detecting a current having an intensity greater than or equal to a reference value. For example, the second current sensor 740 may be a sensor for detecting a current of 300A or more.

According to one embodiment, the BMS 410 activates the first current sensor 730 and deactivates the second current sensor 740 , using the first current sensor 730 to flow through the lithium ion battery 322 . current can be sensed. Subsequently, when the X-ray irradiator 305 irradiates X-rays, the BMS 410 deactivates the first current sensor 730 and activates the second current sensor 740 , using the second current sensor 740 . An overcurrent generated during X-ray irradiation can be detected. Subsequently, when the X-ray irradiation is completed, the BMS 410 deactivates the second current sensor 740 and activates the first current sensor 730 , using the first current sensor 730 to use the lithium ion battery 322 . ) can be detected. According to an example, the BMS 410 receives an X-ray irradiation preparation signal from the controller 310 , activates the second current sensor 740 , and uses the second current sensor 740 to generate overcurrent generated during X-ray irradiation. can detect

The BMS 410 may check the remaining amount of the lithium ion battery 322 based on the amount of current sensed using the current sensors 730 and 740 of different capacities. Specifically, the BMS 410 may check the remaining amount of the lithium ion battery 322 using a current accumulating method (Coulomb Counting Based Gauging) based on the sensed amount of current.

Also, the X-ray apparatus 100 may further include a third current sensor 751 for measuring a charging current. That is, the X-ray apparatus 700 may further include a third current sensor 751 at the output end of the charging unit 330 . When the lithium ion battery 322 is simultaneously charged and discharged, the current measured by the first current sensor 730 or the second current sensor 740 may be the sum of the discharging current and the charging current. Accordingly, in order to accurately measure the discharging current and the charging current, the X-ray apparatus 100 may measure the charging current using the third current sensor 751 .

The BMS 410 may receive a signal that the X-ray emitter 305 radiates X-rays and a signal that the X-ray emitter 305 completes X-ray irradiation from the controller 310 through the communication interface.

The BMS 410 may output a first signal based on the battery state. The first signal may be, for example, a shutdown signal applied to the shutdown circuit 710 . The BMS 410 may be turned off by itself using the shutdown circuit 710 . As a result of detecting the state of the lithium ion battery 322 , the BMS 410 may recognize a dangerous situation such as overdischarge and overcharge, and may be turned off by itself using the shutdown circuit 710 as a protection circuit. When the BMS 410 is turned off, the power supplied to the controller 310 is also stopped, so the controller 310 may also be turned off.

The fuse 760 is a device for preventing an excessive current exceeding a prescribed value from continuously flowing in the power supply unit 320 , and may protect battery cells when the lithium ion battery 322 is externally short-circuited.

The DC-DC converter 720 may convert power supplied from the lithium ion battery 322 into DC power for driving the BMS 410 .

8 illustrates a shutdown process of a mobile X-ray apparatus according to an exemplary embodiment of the present disclosure.

It will be described with reference to FIGS. 7 and 8 .

Each of the power supply unit 320 , the control unit 310 , and the charging unit 330 may include a communication interface, and may communicate with each other through the communication interface. For example, each of the power supply unit 320 , the control unit 310 , and the charging unit 330 may communicate according to CAN.

The power supply unit 320 may include a first temperature sensor 820 . According to an embodiment, the power supply unit 320 may include a BMS-only first temperature sensor 820 that can be directly monitored by the BMS 410 . The BMS 410 may monitor the temperature of the power supply unit 320 using the first temperature sensor 820 to determine whether the power supply unit 320 is overheated. For example, when the temperature of the power supply unit 320 is overheated by a predetermined threshold or higher, the BMS 410 controls the charge FET which is the charge control unit and the discharge FET which is the discharge control unit to control the charging path and the discharging path. It can be turned off by itself by blocking the circuit and controlling the protection circuit.

Also, the power supply unit 320 may further include a second temperature sensor 810 . According to an embodiment, the power supply unit 320 may include a second temperature sensor 810 dedicated to the control unit that can be directly monitored by the control unit 310 . The second temperature sensor 810 may be disposed outside the BMS 410 . In the case of a communication error between the control unit 310 and the BMS 410 , the control unit 310 cannot know the temperature information of the power unit 320 from the BMS 410 , so the control unit 310 controls the second temperature sensor 810 . Through this, the temperature of the power supply unit 320 may be monitored. Therefore, when the communication state is an error, the controller 310 may determine whether to turn off the power supply 320 using the second temperature sensor 810 , regardless of the state of the BMS 410 .

Each of the power supply unit 320 and the charging unit 330 may include interrupt pins 831 and 833 directly controllable by the control unit 310 . In other words, the control unit 310 may turn off each of the power supply unit 320 and the charging unit 330 through a disable signal through the interrupt pins 831 and 833 . Therefore, when the control unit 310 determines that the temperature of the power supply unit 320 is greater than or equal to a predetermined threshold through the control unit dedicated temperature sensor 810, the power supply unit 320 and the charging unit 330 are forcibly turned off through the interrupt pins 831 and 833. can do it

In addition, when the BMS 410 operates a shutdown circuit that is a protection circuit to turn itself off, a shutdown signal of the BMS 410 may be transmitted to the controller 310 . The controller 310 may monitor whether the BMS 410 is shut down for a predetermined time after receiving the shutdown signal. As a result of monitoring, if the BMS 410 is not shut down for a certain period of time, the controller 310 may forcibly turn off the BMS 410 through the interrupt pin 831 . For example, after the BMS 410 activates the shut down bit, the controller 310 may monitor whether the BMS 410 is shut down for 10 seconds, and the BMS 410 shuts down for 10 seconds. If not, the controller 310 may forcibly turn off the BMS 410 through the interrupt pin 831 .

9 and 10 show a shutdown circuit and its surroundings according to an exemplary embodiment of the present disclosure.

Referring to FIG. 9 , a shutdown circuit 710 , a DC-DC converter 720 , and a BMS 410 are illustrated.

The shutdown circuit 710 may include a first switch 712 , a second switch 713 , a third switch 714 , and a fourth switch 715 .

The first switch 712 may be implemented using a relay switch, FET, or other switching element. The first switch 712 may cut off the power input to the DC-DC converter 720 .

For example, the first switch 712 may be configured as an FET and may be turned on or off by a voltage applied to a gate terminal. The first switch 712 is turned on by the first signal 410b, the second signal 410c, and/or the third signal 410d output from the BMS 410 when the BMS 410 operates normally. can be off

The second switch 713 is driven by the DC power supply 410a output from the BMS 410 and may be turned on or off based on the first signal 410b. The first switch 712 may be turned on when the second switch 713 is turned on, and may be turned off when the second switch 713 is turned off. The first signal 410b is output from the BMS 410 and may be a shutdown signal for shutting down the BMS 410 . The second switch 713 may be turned off when the BMS 410 is shut down. The second switch 713 may be implemented as, for example, a photo coupler, but is not limited thereto.

The third switch 714 may operate independently of the operation of the BMS 410 and may be turned on by power supplied from the charging unit in a state in which the BMS 410 is shut down. The third switch 714 may be implemented as, for example, a photo coupler, but is not limited thereto.

The fourth switch 715 may be maintained in an on state when there is no driving power. One side of the fourth switch 715 may be connected to the third switch 714 to control an on or off operation of the third switch 714 . When the fourth switch 715 is turned on, the third switch 714 may also be turned on, and when the fourth switch 715 is turned off, the third switch 714 may also be turned off. The fourth switch 715 may be driven by DC power output from the BMS 410 . The fourth switch 715 may be implemented as, for example, a photo coupler, but is not limited thereto.

When the BMS 410 operates normally, it may output a DC power source 410a, a first signal 410b, a second signal 410c, and a third signal 410d.

The DC power may be a driving power for operating the first switch 712 , the second switch 713 , the third switch 714 , and the fourth switch 715 .

The first signal 410b is a shutdown signal for shutting down the BMS 410 and may be connected to one side of the second switch to control on or off of the second switch. For example, when the BMS 410 operates normally, the first signal 410b maintains a logic low state to turn on the second switch 713 , and transitions to a logic high state when the BMS 410 is shut down. The second switch 713 may be turned off.

The second signal 410c is connected to one side of the fourth switch 715 and may turn off the fourth switch 715 when it is in a logic low state.

The third signal 410d may be connected to the gate terminal of the first switch 712 , and may turn on the first switch 712 when it is in a logic low state.

The shutdown circuit 710 may shut down the BMS 410 by blocking the power input to the DC-DC converter 720 by the third signal 410b output from the BMS 410 . When the BMS 410 is shut down, the power supplied to the BMS 410 may be cut off and the BMS 410 may be turned off.

Hereinafter, the operation of the shutdown circuit 710 in a state in which the BMS 410 operates normally will be described.

When the BMS 410 operates normally, the first signal 410b may be output in a logic low state, and the second signal 410c may be output in a logic high state.

The driving power 410a may be applied to one side of the second switch 713 and the first signal 410b in a logic low state may be applied to the other side. Accordingly, the second switch 713 may be in an on state. The second switch may turn on or off the first switch in a state in which the BMS 410 normally operates.

As the second switch 713 is turned on, a current path 717 is formed, and a voltage lower than the source terminal is applied to the gate terminal of the first switch 712 by a resistor 791 and a resistor 792 . When applied, the first switch 712 is turned on, and power applied to the terminal 711 may be supplied to the BMS 410 through the DC-DC converter.

Meanwhile, the fourth switch 715 may be turned on when the driving power 410a is not present. The fourth switch 715 may be turned off when the driving power 410a is applied and the second signal is applied in a logic low state. As the fourth switch 715 is turned off, current cannot flow to the control terminal of the third switch 714 , so that the third switch 714 may also be turned off. That is, when the BMS 410 operates normally, the first switch 712 may be controlled by the driving power output from the BMS 410 and the control signals 410b, 410c, and 410d to maintain the on state.

The following describes an operation in which the BMS 410 is shut down according to an abnormal condition.

When the BMS 410 detects overcharging, overdischarging, or overheating of the battery, the BMS 410 may output the first signal 410b to a logic high state and shut down the BMS 410 . That is, the power supplied to the BMS 410 can be cut off.

As the first signal 410b transitions from the logic low state to the logic high state, the second switch 713 is turned off. As the second switch 713 is turned off, the gate terminal of the first switch 712 is opened. Accordingly, the first switch 712 is turned off and the power supplied to the DC-DC converter 720 is cut off and the BMS The power supplied to the 410 is also cut off, and the BMS 410 is shut down.

As the BMS 410 is cut off, the power source 410a and the first signal 410b, the second signal 410c for driving the second switch 713, the third switch 714, and the fourth switch 715, The third signal 410d is not output.

The following describes a process of waking up after the BMS 410 is shut down. The wake-up operation may mean supplying power so that the shut-down BMS 410 can operate normally. In a state in which the BMS 410 is shut down, power is not supplied from the battery because the discharge path of the battery is blocked.

In this case, when the AC power cord ( 750 of FIG. 1A ) is connected to an outlet (not shown) in order to operate the BMS 410 normally, power may be applied to the terminal 711 through the charging unit 330 .

In a state in which the BMS 410 is shut down, the fourth switch 715 is turned on, and as power is applied to the terminal 711 , power is supplied to the third switch 714 through a resistor 791 and a resistor 792 . As this is applied, a current path 718 may be formed. Accordingly, the third switch 714 is turned on, and as the third switch 714 is turned on, a current path 717 may be formed. As the current paths 717 and 718 are formed, power is applied to the gate terminal of the first switch 712 through the resistor 791 and the first switch 712 is turned on. As the first switch 712 is turned on, power is applied to the BMS 410 through the DC-DC converter 720 and the BMS 410 may operate normally. That is, the BMS 410 may be automatically turned on as the BMS 410 is shut down and power is supplied to the power supply through the charging unit 330 by connecting the AC power cord.

10 illustrates a shutdown circuit and its surroundings according to an exemplary embodiment of the present disclosure.

Referring to FIG. 10 , a shutdown circuit 710 , a DC-DC converter 720 , and a BMS 410 are illustrated.

The shutdown circuit 710 may include a first switch 712 , a second switch 713 , a third switch 714 , a fourth switch 715 , and a fifth switch 716 .

The operations of the first switch 712 , the second switch 713 , the third switch 714 , and the fourth switch 715 are omitted since they have been described in FIG. 9 , and here the operation of the fifth switch 716 is described Explain.

The shutdown circuit 710 may include a fifth switch 716 . The fifth switch 716 may be a physical switch 716 , and as the physical switch 716 operates, the BMS 410 may operate as described with reference to FIG. 9 . The physical switch 716 may be, for example, a push switch that can be turned on or off by a user's pressing action.

The fifth switch 716 is mounted on the outside of the main body (101 in FIG. 1A) and can be pressed by the user.

The fifth switch 716 may wake up the BMS 410 when the BMS 410 is in a shutdown state.

One side of the fifth switch 716 may be connected to the gate terminal of the first switch 712 through a resistor 792 , and the other side may be grounded. When the user connects the AC power cord while the BMS 410 is shut down, power is applied to the terminal 711 and when the fifth switch 716 is pressed, one side of the fifth switch 716 is grounded and the current passes ( 717) may be formed. Accordingly, a voltage drop occurs at the gate terminal of the first switch 712 , and the first switch 712 is turned on to supply power to the BMS 410 . The fifth switch 716 may be mounted in a state exposed to the outside of the mobile X-ray apparatus 101 in FIG. 1A , and the user operates the fifth switch 716 while the BMS 410 is shut down to operate the mobile device. The X-ray apparatus may be woken up.

Conventionally, when the BMS is shut down after blocking the charging path and the discharging path, the X-ray apparatus may not be driven for safety reasons. In this state, even if power is applied from the outside of the main body, the BMS cannot be woken up, so that current does not flow through the charging path and the discharging path, and as a result, the X-ray device is still not driven. However, according to the present disclosure, it is possible to wake up the shut down BMS by connecting the AC power cord mounted on the main body to an outlet, and accordingly, the X-ray apparatus may be driven. In addition, according to the present disclosure, it is possible to wake up the shutdown BMS by pressing a switch mounted on the body.

The disclosed embodiments have been described with reference to the accompanying drawings as described above. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be practiced in other forms than the disclosed embodiments without changing the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

Claims (4)

an X-ray irradiator for irradiating X-rays to the object;
a battery for supplying power to the X-ray irradiation unit;
a battery management system (BMS) that monitors at least one of voltage, current, and temperature of the battery to determine a state of the battery, and operates a shutdown circuit that is a protection circuit according to the determined state of the battery; and
Receives a shut down signal from the BMS, monitors the status of the BMS for a preset time from the time when the shutdown signal is received, and turns off the BMS based on the status of the BMS a control unit for controlling the BMS to be possible;
Including, a mobile X-ray device.
According to claim 1,
The control unit turns off the BMS when the BMS is not shut down for a preset time from a time point when the shutdown signal is received.
According to claim 1,
a charging unit supplying charging power to the battery and the BMS; further comprising,
The BMS is switched from the off state to the on state by the power supplied from the charging unit, the mobile X-ray apparatus.
4. The method of claim 3,
The charging unit includes an interrupt pin controlled by the control unit,
The control unit turns off the charging unit through a disable signal through the interrupt pin (disable signal) through the mobile X-ray apparatus.

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