WO2021221293A1

WO2021221293A1 - Display device and power supply device

Info

Publication number: WO2021221293A1
Application number: PCT/KR2021/002872
Authority: WO
Inventors: 주성용; 박선진; 정성범
Original assignee: 삼성전자주식회사
Priority date: 2020-04-28
Filing date: 2021-03-09
Publication date: 2021-11-04
Also published as: KR20210132950A

Abstract

A display device, according to one embodiment, comprises: a plurality of display modules; and at least one power supply device for supplying power to the plurality of display modules. The at least one power supply device comprises: a rectifier circuit which converts AC power to DC power; a plurality of reference converters which each transform the DC power to a first voltage and output the first voltage between a reference ground node and a reference output node; a plurality of floating converters which have a plurality of floating output nodes connected in parallel, and which each transform the DC power to the first voltage and output the first voltage between the floating output node and a floating ground node connected to the reference output node; and a plurality of load share circuits which are respectively provided to the plurality of floating output nodes and are mutually connected so that respective output currents of the plurality of floating converters are equalized.

Description

Display unit and power supply

The present invention relates to a display device of a modular type that provides a large display screen including a plurality of display modules, and a power supply device for supplying power.

In general, a display device is an output device that visually displays received or stored image information to a user, and is used in various fields such as homes and businesses.

Furthermore, like a video wall, a display device of a modular type in which a plurality of display modules work together to output an image in order to implement a large display screen is provided. That is, the modular type display device includes a plurality of display modules arranged in a matrix form, and a part of the entire image may be displayed on each display module.

Recently, a discussion on a power structure for efficiently supplying power to each of the display modules included in such a modular type display device has been actively conducted.

A power supply including a plurality of floating converters that are floated by using an output terminal of each of the plurality of reference converters as a signal ground terminal and providing a load share only between the plurality of floating converters, and a display including the same provide the device.

A display apparatus according to an embodiment includes a plurality of display modules; and at least one power supply for supplying power to the plurality of display modules, wherein the at least one power supply includes: a rectifier circuit for converting AC power into DC power; a plurality of reference converters for converting the DC power to a first voltage and outputting the first voltage between a reference ground node and a reference output node; Transforms the DC power to a first voltage, outputs the first voltage between a floating ground node connected to the reference output node and a floating output node, and a plurality of floating output nodes connected in parallel floating converter; and a plurality of load share circuits provided in each of the plurality of floating output nodes and connected to each other so that the output currents of the plurality of floating converters are equal to each other.

Each of the plurality of display modules may include a reference ground node; and a power supply node connected to the plurality of floating output nodes.

The plurality of reference converters and the plurality of floating converters may be connected in parallel to the rectifier circuit.

Each of the plurality of floating converters may be connected in series with the corresponding reference converter using a reference output node of the corresponding reference converter as a floating ground node.

The plurality of floating converters may be connected in parallel to each other by connecting the plurality of floating output nodes corresponding to each of the plurality of floating converters in parallel to each other.

The plurality of reference converters may output the first voltage to a load having a reference ground node, and the plurality of floating converters may output a voltage corresponding to twice the first voltage to a load having a reference ground node. can

The display device may include a speaker; and a main board provided with a processor for processing image data, wherein the plurality of reference converters may supply power to at least one of the speaker and the main board.

The plurality of floating converters may be connected to at least one display module, and may supply power for driving a display panel to the at least one display module.

The at least one power supply device may include a plurality of power supply devices, and each of the plurality of power supply devices may be connected to a preset number of display modules to supply power.

A first load share circuit among the plurality of load share circuits detects a current value at a first floating output node, obtains a current value at another floating output node from another load share circuit, and the first floating output node and outputting a feedback signal for controlling a switching element to the first floating converter based on a difference in current values between the different floating output nodes.

Each of the plurality of floating converters may output the same power.

A display apparatus according to an embodiment includes a plurality of display modules; and at least one power supply for supplying power to the plurality of display modules, wherein the at least one power supply includes: a rectifier circuit for converting AC power into DC power; a first reference converter that transforms the DC power into a first voltage and outputs the first voltage between a reference ground node and a first reference output node; a first floating converter that transforms the DC power into a first voltage and outputs the first voltage between a floating ground node connected to the first reference output node and a first floating output node; a second reference converter that transforms the DC power into a first voltage and outputs the first voltage between a reference ground node and a second reference output node; a second floating second floating voltage that transforms the DC power into a first voltage and outputs the first voltage between a floating ground node connected to the second reference output node and a second floating output node connected in parallel to the first floating output node converter; a first load share circuit provided in the first floating output node; and a second load share circuit provided at the second floating output node and connected to the first load share circuit.

The first reference converter and the second reference converter output the first voltage to a load having a reference ground node, and the first floating converter and the second floating converter are configured to output the first voltage to a load having a reference ground node. A voltage corresponding to twice the voltage of 1 can be output.

The display device may include a speaker; and a main board provided with a processor for processing image data, wherein the first reference converter and the second reference converter may supply power to at least one of the speaker and the main board.

A power supply including a plurality of floating converters that are floated by using an output terminal of each of the plurality of reference converters as a signal ground terminal and providing a load share only between the plurality of floating converters, and a display including the same By providing the device, it is possible to reduce the size of the output voltage of the converter to enable miniaturization of the components, and to minimize the current deviation between the converters by reducing the number of converters subject to load sharing.

1 illustrates a display device according to an exemplary embodiment.

2 is a control block diagram of a display apparatus according to an exemplary embodiment.

3 is a schematic diagram of a power supply device according to an embodiment;

4 is a block diagram of a power supply device according to an embodiment.

5 shows an example of a circuit configuration of a power supply device according to an embodiment.

6 shows an example of a load share circuit of a power supply according to an embodiment.

7 is a diagram for explaining a load share in a plurality of floating converters according to an embodiment.

The configuration shown in the embodiments and drawings described in this specification is only a preferred example of the disclosed invention, and there may be various modifications that can replace the embodiments and drawings of the present specification at the time of filing of the present application.

Throughout this specification, when a part is "connected" with another part, this includes not only a case in which it is directly connected but also a case in which it is indirectly connected, and the indirect connection refers to being connected through a wireless communication network. include

In addition, the terms used herein are used to describe the embodiments, and are not intended to limit and/or limit the disclosed invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as "comprises" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It does not preclude the possibility of the presence or addition of figures, numbers, steps, operations, components, parts, or combinations thereof.

In addition, terms including an ordinal number such as "first", "second", etc. used herein may be used to describe various elements, but the elements are not limited by the terms, and the terms are It is used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

In addition, terms such as "~ part", "~ group", "~ block", "~ member", and "~ module" may mean a unit for processing at least one function or operation. For example, the terms may mean at least one process processed by at least one hardware such as a field-programmable gate array (FPGA) / application specific integrated circuit (ASIC), at least one software stored in a memory, or a processor. have.

The signs attached to each step are used to identify each step, and these signs do not indicate the order between the steps, and each step is performed differently from the stated order unless the context clearly indicates a specific order. can be

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a display device according to an exemplary embodiment.

Referring to FIG. 1 , the display apparatus 10 according to an embodiment may include a plurality of display modules 160 , and each of the plurality of display modules 160 is controlled to display a corresponding part of the entire image. By doing so, the entire video can be displayed.

The display device 10 may be a large format display (LFD) installed outdoors, such as on the roof of a building or at a bus stop, like a video wall. Here, the outdoors is not necessarily limited to the outdoors, and the display device 10 according to an embodiment may be installed as long as it is a place where a large number of people can come in and out even if it is indoors, such as a subway station, a shopping mall, a movie theater, a company, or a store.

That is, the display device 10 may correspond to a video wall (eg, THE WALL ^TM ) using a modular technology, and by varying the number and arrangement of the included display modules 160 , various sizes and may be provided in the form.

In this case, the display device 10 may correspond to a micro LED TV in which the display module 160 includes a substrate and a plurality of light emitting diodes mounted on a mounting surface of the substrate, according to an embodiment. That is, a unit pixel in the display module 160 may emit light by itself, including a plurality of light emitting diodes emitting different colors. In addition, the light emitting diode of the display module 160 may be implemented as a micro LED, so that a pixel size may be reduced and a high resolution may be realized.

In addition, the light emitting diode of the display module 160 may be implemented with an inorganic material, depending on the embodiment. Inorganic light emitting diodes have a faster reaction speed than organic light emitting diodes (OLEDs) and can realize high brightness with low power. In addition, organic light emitting diodes require an encapsulation process because they are vulnerable to exposure to moisture and oxygen and have low durability, whereas inorganic light emitting diodes do not require an encapsulation process and have strong durability.

The display device 10 may provide the plurality of display modules 160a - 160i in a matrix form by matching rows and columns. For example, as shown in FIG. 1 , the plurality of display modules 160a - 160i may be arranged in a matrix of 3 rows and 3 columns. However, there is no limitation in the number and matrix form of the display modules 160 included in the display device 10 . Hereinafter, for convenience of description, an example in which the display apparatus 10 provides the first display module 160a to the ninth display module 160i in the form of a mattress of three rows and three columns will be described as an example.

Each of the plurality of display modules 160 is a device capable of processing image data and visually displaying an image.

The display module 160 may include a main body 161 accommodating a plurality of parts for displaying an image, and a display panel 162 provided at one side of the main body 161 to display a part of the image.

The main body 161 forms the outer shape of the display module 160 , and parts for the display module 160 to display an image may be provided inside the main body 161 .

The display panel 162 is formed on the front surface of the main body 161 , and an image that is visual information may be displayed on the display panel 162 . For example, a still image or a moving image may be displayed on the display panel 162 , and a 2D flat image or a 3D stereoscopic image may be displayed.

A plurality of pixels P are formed in the display panel 162 , and an image displayed on the display panel 162 may be formed by a combination of light emitted from the plurality of pixels P. For example, one image may be formed on the display panel 162 by combining the light emitted by the plurality of pixels P like a mosaic.

Each of the plurality of pixels P may emit light of various brightnesses and various colors, and in order to emit light of various colors, each of the plurality of pixels P may include sub-pixels P _R , P _G , and P _B ) may be included.

The sub-pixels P _R , P _G , and P _B are a red sub-pixel P _R capable of emitting red light, a green sub-pixel P _G capable of emitting green light, and a blue light emitting device. It may include a blue sub-pixel P _B that can do this.

However, the unit pixel P does not necessarily _{consist of a red sub-pixel P R} , a green sub-pixel P _G , and a blue sub-pixel P _B , and a sub-pixel emitting yellow or white light is used. It is also possible to further include, and at least one of the _{red sub-pixel P R} , the green sub-pixel P _G , or the blue sub-pixel P _{B may be omitted.}

The display device 10 including the plurality of display modules 160a - 160i may integrally form one screen S. In other words, the screen S of the display device 10 is formed by the combination of the display panel 162 of the plurality of display modules 160a-160i, that is, the display device 10, that is, the plurality of display modules 160a-160i. ) can display one image integrally.

Each of the plurality of display modules 160a - 160i may display a portion of an image displayed on the entire screen S. Each of the plurality of display modules 160a - 160i may occupy a partial area of the screen S according to the arrangement, and may output different portions of the entire image according to the arrangement.

The plurality of display modules 160a - 160i may extract a portion of image data of the entire image according to their respective positions, and display an image (a portion of the entire image) corresponding to the extracted partial image data.

For example, the plurality of display modules 160a - 160i may each store a unique identification number according to a location, and may extract a part of image data of the entire image based on the unique identification number.

Specifically, the first display module 160a located in column 1 and row 1 may store a unique identification number '11', and according to the unique identification number '11', a total of 9 images, 3 horizontally and 3 vertically, are displayed. It is divided into regions, and image data of the upper left region among the nine regions can be extracted. Thereafter, the first display module 160a may display an image corresponding to the image data of the upper left region.

In this way, each of the plurality of display modules 160a-160i may display a part of an image, and an integrated image may be displayed by a combination of images output by each of the plurality of display modules 160a-160i. can

In this case, the display device 10 may include a power supply device to supply driving power to the plurality of display modules 160 and components such as speakers or main board, and share a load between the plurality of converters. By providing a load share, it is possible to provide a stable power supply.

Hereinafter, the configuration and operation of the display device 10 and the power supply device for supplying power to the display device 10 will be described.

Hereinafter, the configuration and operation of each of the image processing apparatus 100 and the display apparatus 200 will be described.

2 is a control block diagram of the display device 10 according to an embodiment, and FIG. 3 is a schematic diagram of a power supply device according to an embodiment.

Referring to FIG. 2 , the display apparatus 10 according to an embodiment includes an input unit 110 for receiving an input from a user, and a content receiving unit 120 for receiving content including image data and sound data from an external device. A storage unit 130 for storing data such as contents, a control unit 140 for processing contents received from the outside, and outputting images and sounds corresponding to the contents, and a display apparatus 10 ) a power supply 150 for supplying power to each component, a plurality of display modules 160a-160i for displaying an image corresponding to the content, and a sound output unit for outputting a sound corresponding to the content ( 170).

The input unit 110 according to an embodiment may receive various control commands from a user.

For example, the input unit 110 may include an input button 111 as shown in FIG. 2 . The input button 111 according to an embodiment includes a power button for turning on/off the power of the display device 10 , a selection button for selecting a content source, a play button for playing or stopping playback of content, etc. can do.

On the other hand, the various buttons included in the input button 111 include a push switch and a membrane switch for detecting the user's pressure or a touch switch for detecting the user's body part contact. can be hired However, the present invention is not limited thereto, and the input button 111 may employ various input means capable of outputting an electrical signal to the controller 140 in response to a specific operation of the user.

In addition, the input unit 110 according to an embodiment may include a signal receiver 112 for receiving a remote control signal of the remote controller.

In this case, the remote controller for obtaining the user input may be provided separately from the display apparatus 10 , and may obtain the user input and transmit a wireless signal corresponding to the user input to the display apparatus 10 .

The signal receiver 112 may receive a wireless signal from the remote controller and output an electrical signal corresponding to a user input to the controller 140 .

The content receiving unit 120 may include a wired receiving module 121 that receives content data from a content source by wire, and a wireless receiving module 122 that wirelessly receives content data from the content source.

The wired reception module 121 may receive content data from a content source through various types of image transmission cables. For example, the wired reception module 121 is a component (YPbPr / RGB) cable or a composite (composite video blanking and sync, CVBS) cable or a high definition multimedia interface (HDMI) cable or Ethernet (Ethernet, IEEE 802.3 technology standard) It is possible to receive content data from a content source through a cable or the like.

The wireless reception module 122 may receive content data from a content source using various wireless communication standards.

For example, the wireless receiving module 122 is a wireless device such as Wi-Fi (WiFi, IEEE 802.11 technology standard) or Bluetooth (Bluetooth, IEEE 802.15.1 technology standard) or ZigBee (ZigBee, IEEE 802.15.4 technology standard). It is possible to receive content data from a content source wirelessly using a communication technology standard. In addition, the wireless reception module 122 may wirelessly receive content data from a content source using a wireless communication technology standard such as CDMA, WCDMA, GSM, Long Term Evolution (LTE), and WiBro.

As such, the content receiver 120 may receive content data from a content source by wire or wirelessly, and may output the received content data to the controller 140 .

The storage unit 130 according to an embodiment may store content data and output the stored content data to the controller 140 . To this end, the storage unit 130 may be provided as a known type of storage medium. For example, the storage unit 130 may be provided as a solid stat driver (SSD), a hard disk drive (HDD), or an optical disc drive (ODD).

The control unit 140 according to an embodiment may include at least one memory 142 storing a program for performing the above-described operation and an operation to be described later, and at least one processor 141 executing the stored program. .

The processor 141 according to an embodiment may control the operation of the content receiving unit 120 and/or the storage 130 according to a user input input through the input unit 110 , and the content receiving unit 120 or The content received through the storage unit 130 may be processed to obtain image data and sound data corresponding to the content.

The processor 141 according to an exemplary embodiment may control the display module 160 to output an image corresponding to the image data by outputting the image data to the display module 160 , and generate a sound corresponding to the sound data. It is possible to control the sound output unit 170 to output.

In addition, the processor 141 according to an embodiment may control the power supply 150 to supply power to the display module 160 and various components.

The power supply 150 according to an embodiment may rectify external power, transform the rectified power, and supply it to each component.

In this case, the display device 10 may include at least one power supply device 150 .

Specifically, the display device 10 may include one power supply device 150 according to an embodiment, and the one power supply device 150 is configured as each of the plurality of display modules 160a-160i. power can be supplied.

In addition, the display device 10 may include a plurality of power supply devices 150 according to an embodiment. In this case, each of the plurality of power supply devices 150 includes a preset number of display modules 160 . ) can be supplied with power. That is, some display modules among the plurality of display modules 160a-160i may be connected to each of the plurality of power supply devices 150 , and each of the plurality of display modules 160a-160i includes the plurality of power supply devices 150 . Power may be supplied from the connected power supply 150 . For example, the plurality of power supply devices 150 may be provided in a number corresponding to the number of display modules 160 , or may be provided in the main body 161 of each display module 160 .

The power supply 150 according to an embodiment may include at least one rectifying circuit 151 for rectifying external power, a plurality of reference converters 153 for transforming the rectified power, and a plurality of floating A (floating) converter 155 may be included.

According to an embodiment, one reference converter 153 and one floating converter 155 may be configured as one power supply module. In this case, the power supply device 150 includes a plurality of power supply modules. can do. One power supply module may further include a rectifying circuit 151 according to an embodiment, and may be provided to correspond to at least one display module 160 .

In this case, the reference converter 153 may include a reference ground node and a reference output node, and by providing the reference output node as a floating ground node of the floating converter 155 , the floating converter 155 becomes the reference converter 153 . ) can be made to float as much as the output voltage magnitude. As such, the reference converter 153 may be a reference for floating in the floating converter 155 , and the floating converter 155 may be floated based on the reference converter 153 .

The rectifier circuit 151 according to an embodiment has a circuit configuration for rectifying an external power source, and may be provided as a known type of rectifier, for example, as a diode bridge. At least one rectifier circuit 151 may be provided, and according to an embodiment, the number of the

converters

153 and 155 or the power supply module may be provided, and the number is not limited according to design.

That is, the rectifier circuit 151 may convert AC power into DC power. In this case, the plurality of reference converters 153 and the plurality of floating converters 155 may be connected in parallel to the rectifier circuit 151 and receive DC power converted by the rectifier circuit 151 .

The reference converter 153 and the floating converter 155 may be provided as a known type of DC/DC converter, may include a plurality of inductors having a preset turns ratio, and may include a plurality of switching elements. have.

The reference converter 153 according to an embodiment may transform the rectified power to a first voltage, and includes a reference ground node and a reference output node to output a first voltage between the reference ground node and the reference output node. can

In this case, the output voltage (first voltage) output from the reference output node of the reference converter 153 may be supplied to a load having a reference ground node. For example, the first voltage is the speaker 171 , or a main board (not shown) on which at least one of the input unit 110 , the content receiving unit 120 , the storage unit 130 , and the control unit 140 is provided. It can be supplied as the driving voltage of the load.

The floating converter 155 according to an embodiment may transform the rectified power into a second voltage, and may include a floating ground node connected to a reference output node of the reference converter 153, and may include a floating output node. In addition, the second voltage may be output between the signal output node and the floating output node. The floating ground node may correspond to a signal ground node, and may be connected to an output node of the reference converter 153 to provide an output voltage of the reference converter 153 as a ground voltage of the floating converter 155 .

That is, the floating converter 155 may be connected in series with the corresponding reference converter 153 using the reference output node of the corresponding reference converter 153 as a floating ground node.

In this case, the floating converter 155 may correspond to a converter having the same structure as the reference converter 153 , only changing the connection position of the grounding complex according to an embodiment. Accordingly, when the reference converter 153 outputs a first voltage (eg, 12V) between the reference ground node and the reference output node, the floating converter 155 operates between the floating ground node and the floating output node. 153) may output the same first voltage (eg, 12V) as the output voltage. In this case, a load having a reference ground node and connected to the floating output node may receive a voltage corresponding to twice the first voltage.

The plurality of floating converters 155 may perform load sharing, and through this, each floating converter 155 may supply the same current and the same voltage to the load to supply the same power. To this end, the floating output nodes of each of the plurality of floating converters 155 may be connected in parallel to share an output node, and a load share circuit 158 for load sharing may be provided in each of the floating output nodes. .

That is, the plurality of floating converters 155 included in one power supply 150 may be connected in parallel to each other by connecting a plurality of floating output nodes corresponding to each of the plurality of floating converters 155 in parallel to each other. have.

As such, the power supply 150 is provided at the floating output node of each of the plurality of floating converters 155 and is connected to each other so that the output current of each of the plurality of floating converters 155 becomes the same as a plurality of load share circuits. (158).

The first load share circuit corresponding to any one of the plurality of load share circuits 158 senses a current value at the first floating output node, obtains a current value at another floating output node from another load share circuit, and , may output a feedback signal for controlling the switching element to the first floating converter based on a difference in current value between the first floating output node and the other floating output node.

Specifically, the processor 159 of the power supply device 150 outputs a switching element control signal to the floating converter 155 based on a feedback signal received from the load share circuit 158 , thereby generating the switching element control signal in the floating converter 155 . The output current can be controlled by adjusting the duty ratio of the switching element.

Each of the plurality of display modules 160a - 160i; 160 according to an embodiment includes a display panel 162 that visually displays an image, and a display driver that provides an image signal according to image data to the display panel 162 . 163).

The display panel 162 may generate an image according to the image signal received from the display driver 163 and display the image.

The display panel 162 may include pixels serving as a unit for displaying an image. Each pixel may receive an electrical signal representing an image from the display driver 163 and output an optical signal corresponding to the received electrical signal. As such, one image may be displayed on the display panel 162 by combining optical signals output from a plurality of pixels.

The display panel 162 may be of various types such as a liquid crystal display panel (LCD Panel), a light emitting diode panel (LED Panel), or an organic light emitting diode panel (OLED Panel). may include a display panel of

A light emitting diode panel or an organic light emitting diode panel is a self-luminous panel, and a light emitting diode (LED) or an organic light emitting diode (OLED) may emit light when a current is supplied. In particular, the amount of light emitted by the light emitting diode or the organic light emitting diode may increase as the amount of supplied current increases. In other words, the luminance of the light emitting diode panel or the organic light emitting diode panel may increase as the amount of supplied current increases.

For example, the display panel 162 may correspond to a self-luminous panel including a substrate and a plurality of light emitting diodes mounted on a mounting surface of the substrate, and may be implemented as a micro LED implemented with an inorganic material.

Hereinafter, for convenience of description, it will be described that the display panel 162 is provided as a light emitting diode panel or an organic light emitting diode panel as an example.

The display driver 163 may receive image data from the controller 140 and output a driving current corresponding to the image data to the display panel 162 . Specifically, the display driver 163 may output a driving current corresponding to image data to each of a plurality of pixels constituting the display panel 162 .

When the display driver 163 outputs a driving current corresponding to image data to each pixel constituting the display panel 162 , each pixel outputs light according to the received driving current, and the light output by each pixel These may be combined to form one image.

As such, the display module 160 may display an image according to the image data output from the controller 140 .

The sound output unit 170 according to an embodiment may receive sound data of the content received through the content receiver 120 or the storage unit 130 under the control of the processor 141 and output sound. . In this case, the sound output unit 170 may include one or two or more speakers 171 that convert an electrical signal into a sound signal.

In the above, each configuration of the display device 10 has been described. Hereinafter, the configuration and operation of the power supply 150 will be described in more detail.

3 is a schematic diagram of a power supply device 150 according to an embodiment, and FIG. 4 is a block diagram of a power supply device according to an embodiment.

The power supply 150 according to an embodiment may include at least one rectifying circuit 151 for rectifying external power, a plurality of reference converters 153 for transforming the rectified power, and a plurality of floating A converter 155 may be included.

For example, the power supply 150, as shown in FIGS. 3 and 4, includes one rectifying circuit 151, two

reference converters

153a, 153b; 153, and two floating converters 155a. , 155b; 155). That is, the power supply device 150 may include two

power supply modules

150a and 150b according to an embodiment.

Hereinafter, for convenience of description, it will be described that the power supply 150 includes two

reference converters

153a, 153b; 153 and two floating

converters

155a, 155b; 155 as an example.

The rectifying circuit 151 rectifies the external power to supply the rectified power to each of the first reference converter 153a, the second reference converter 153b, the first floating converter 155a, and the second floating converter 155b. can

However, as described above, the rectifier circuit 151 may be provided for each

converter

153 and 155 or for each

power supply module

150a or 150b according to an embodiment.

The reference converter 153 according to an embodiment may transform the rectified power into a first voltage, and includes a reference ground node 152 and a reference output node 154 , a reference ground node 152 and a reference output. A first voltage of a constant voltage may be output between the nodes 154 .

That is, each of the first reference converter 153a and the second reference converter 153b includes the

reference ground nodes

152a, 152b; 152 and has 0V as a ground voltage, and the

reference ground nodes

152a, 152b; 152). _{and a first voltage (V 1a} , V _1b ; V ₁ ) (eg, 12V) between the

reference output nodes

154a , 154b ; 154 _{to the output voltage V 01a} , V _O1b ; V ₀₁ ) can be output. In other words, a load connected to the reference output node 154 with 0V as the ground voltage including the reference ground node may receive the first voltage as the output voltage.

For example, the first voltage is the speaker 171 , or a main board (not shown) on which at least one of the input unit 110 , the content receiving unit 120 , the storage unit 130 , and the control unit 140 is provided. It can be supplied as the driving voltage of the load.

The floating converter 155 according to an embodiment may transform the rectified power into a second voltage, and may include a floating ground node 156 connected to the reference output node 154 of the reference converter 153 . and may include a floating output node 157 to output a second voltage between the signal output node 156 and the floating output node 157 .

In this way, the floating converter 155 may use the reference output node of the corresponding reference converter 153 as the signal ground, and use the first voltage of the reference converter 153 as the ground voltage. That is, the first floating converter 155a may include a first floating ground node 156a connected to the first reference output node 154a of the first reference converter 153a, and the second floating converter 155b. may include a second floating ground node 156b connected to the second reference output node 154b of the second reference converter 153b.

That is, the reference converter 153 is configured as a reference ground and may have 0V as a ground voltage, and the floating converter 155 is configured as a signal ground for the reference output node 154 of the reference converter 153 . , the first voltage may be a ground voltage.

Accordingly, the floating converter 155 may supply an output voltage corresponding to the sum of the first voltage and the second voltage to a load having a reference ground node through the floating output node 157 . For example, an output voltage from the floating output node 157 may be supplied to the display module 160 , and may be used as a driving voltage of the display panel 162 by the display driver 164 . In this case, the floating converter 155 is, according to an embodiment, a converter having the same structure as the reference converter 153 , and a first voltage corresponding to the same voltage as that of the reference converter 153 between the floating ground node and the floating output node. voltage can be output. In this case, the floating converter 155 may supply an output voltage corresponding to twice the first voltage to a load having a reference ground node through the floating output node 157 .

For example, the floating

converters

155a, 155b; 155 may _{transform the rectified power into a second voltage V 2a} , V _2b ; V ₂ (eg, 12V) that is a constant voltage, and the first voltage V _{Since 1a} , V _1b ; V ₁ ) (eg 12V) is the ground voltage, the sum of the first and second voltages (V _1a +V _2a , V _1b +V _2b ; V ₁ +V ₂ ) (eg: _{24V) as output voltages V 02a} , V _O2b ; V ₀₂ for a load having a reference ground node.

In other words, a load connected to the floating output node 157 having 0V as the ground voltage including the reference ground node may receive a voltage corresponding to the sum of the first voltage and the second voltage as the output voltage.

As such, the power supply device 150 according to an embodiment configures the signal ground of the floating converter 155 as an output node of the reference converter 153 so that the floating converter 155 can be floated. Accordingly, it is possible to prevent the floating converter 155 from transforming the output voltage level (the first voltage) of the reference converter 153 . That is, the floating converter 155 needs to receive the first voltage output by the reference converter 153 and transform only the second voltage.

For example, in a system that requires 24V as an output voltage, when the floating converter 155 is not floating, a 24V transformation is required for the floating converter 155 , whereas the floating converter 155 uses the reference converter 153 . When the output voltage of ) is floated by 12V, only 12V transformation is required for the floating converter 155 .

Through this, the floating converter 155 may be designed with a smaller component (eg, an output capacitor) compared to the existing one, and the output of the reference converter 153 is a component requiring a low output voltage (eg, a display device (eg, a display device) 10) by supplying the speaker 171, etc.), a separate converter for a low output voltage can be omitted, thereby minimizing the number of parts.

In this case, the plurality of floating converters 155 may perform load sharing, and through this, each floating converter 155 may supply the same current and the same voltage to the load to supply the same power. To this end, the floating output node 157 of each of the plurality of floating converters 155 may be connected in parallel to share an output node, and each of the floating output nodes 157 has a load share circuit 158 for load sharing. ) can be provided.

For example, the first floating output node 157a of the first floating converter 155a and the second floating output node 157b of the second floating converter 155b may be connected in parallel to share an output node, , and floating

output nodes

157a, 157b; 157 may be provided with

load sharing circuits

158a, 158b; 158 for load sharing, respectively.

A first load share circuit 158a among the plurality of load share circuits 158 senses a current value at the first floating output node 157a, and receives a second floating output node ( 157b), and a feedback signal for controlling the switching element to the first floating converter 155a based on the difference in the current value between the first floating output node 157a and the second floating output node 157b can be printed out. As such, the second load share circuit 158b may also output a feedback signal for controlling the switching element to the second floating converter 155b.

As such, in the power supply 150 according to an embodiment, by configuring the load share only for the floating converter 155 excluding the reference converter 153 , the number of load shares can be reduced by half, and through this , the current deviation between the load-shared floating converters 155 can be minimized. In addition, since the plurality of floating converters 155 share the load with each other in a state where the output voltage of the reference converter 153 maintaining the constant voltage is used as the ground voltage, the output voltage transferred to the load connected to the floating output node is Since the fluctuation is small, it may be advantageous to the constant voltage characteristic.

FIG. 5 shows an example of a circuit configuration of the power supply device 150 according to an embodiment, and FIG. 6 shows an example of a load share circuit 158 of the power supply device 150 according to an embodiment. and FIG. 7 is a view for explaining a load share in a plurality of floating converters 155 according to an embodiment.

Referring to FIG. 5 , the power supply 150 according to an embodiment includes a first reference converter 153a and a second reference converter 153b that transforms rectified power into a first voltage, and a rectified power supply. It may include a first floating converter 155a and a second floating converter 155b for converting to a second voltage.

Each of the first reference converter 153a and the second reference converter 153b includes a

reference ground node

152a, 152b; 152 configured as a reference ground, and a

reference output node

154a, 154b; 154 connected to a load. ) may be included.

In this case, reference-grounded first output capacitors C _1a , C _1b ; C ₁ may be provided in each of the

reference output nodes

154a, 154b; 154, and the first output capacitor C ₁ is the reference It is charged by the first voltage output from the converter 153 to maintain the reference output node 154 at a potential increased by the first voltage from the reference ground node 152 .

Through this, the reference converter 153 may supply _{the first voltage V 1} to the load connected to the reference output node 154 . For example, the first reference converter 153a may apply a first voltage to the speaker 171 that has a reference ground node and is connected to the first reference output node 154a. Also, the second reference converter 153b may apply the first voltage to the main board 15 having a reference ground node and connected to the second reference output node 154b.

Each of the first floating converter 155a and the second floating converter 155b includes a floating

ground node

156a, 156b; 156 configured with a signal ground coupled to a

reference output node

154a, 154b; 154; It may include a floating output node (157a, 157b; 157) connected to the load.

At this time, the floating output nodes (157a, 157b; 157), respectively, the reference output nodes (154a, 154b; 154) to the signal ground second output capacitors (C _2a , C _2b ; C ₂ ) may be provided, The second output capacitor C ₂ is charged by the second voltage output from the floating converter 155 to connect the floating output node 157 by the second voltage from the floating ground node 156 connected to the reference output node 154. It can be maintained at an elevated potential. Through this, the floating output node 157 may be maintained at a potential that is increased by a voltage corresponding to the sum of the first voltage and the second voltage from the reference ground (0V).

The first floating output node 157a and the second floating output node 157b may be connected in parallel to each other for load sharing. Through this, each of the first floating output node 157a and the second floating output node 157b may share a load connected to the node and supply the same power to the load by supplying the same current and the same voltage. .

For example, the first floating output node 157a and the second floating output node 157b may be connected to the display module 160 and supply the same power to the display module 160 . That is, when the required power of the display module 160 is 400W, the first floating converter 155a may supply 200W of power through the first floating output node 157a, and the second floating converter 155b , 200W of power may be supplied through the second floating output node 157b. At this time, since the display module 160 is configured as a reference ground (0V) and connected to the floating output node 157 , a voltage corresponding to the sum of the first voltage and the second voltage may be applied.

As such, each of the plurality of display modules 160 included in the display device 10 includes a reference ground node connected to a reference ground (0V), and a plurality of floating output nodes in the corresponding power supply device 150 . It may include a power supply node connected to (157a, 157b; 157).

In addition, each of the first floating output node 157a and the second floating output node 157b may be provided with

load sharing circuits

158a, 158b; 158 for load sharing.

For example, the first load share circuit 158a includes resistors _{R 2a} , R _3a , and R _4a for adjusting the voltage ratio between both ends of _{the load resistor R 1a provided on the first floating output node 157a .} , R _5a ). However, according to an embodiment, the first load share circuit 158a may be directly connected to both ends of the load resistor R _1a _{without resistors R 2a} , R _3a , R _4a , R _{5a for voltage ratio adjustment.} can In addition, the second load share circuit 158b includes resistors _{R 2b} , R _3b , R _4b , and R for adjusting the voltage ratio between both ends of _{the load resistor R 1b provided on the second floating output node 157b .} _5b ) can be connected.

Through this, the first load share circuit 158a may sense the current value at the first floating output node 157a, and the second load share circuit 158b is configured to operate at the second floating output node 157b. current value can be detected.

A first load share circuit 158a among the plurality of load share circuits 158 senses a current value at the first floating output node 157a, and receives a second floating output node ( 157b), and a feedback signal for controlling the switching element to the first floating converter 155a based on the difference in the current value between the first floating output node 157a and the second floating output node 157b (F/B) can be output. As such, the second load share circuit 158b may also output the feedback signal F/B for controlling the switching element to the second floating converter 155b.

For example, when the current value in the first floating output node 157a is lower than the current value in the second floating output node 157b, the first load share circuit 158a may ) may output the feedback signal F/B to increase the output current, and when the current value in the first floating output node 157a is higher than the current value in the second floating output node 157b, The first floating converter 155a may output the feedback signal F/B to lower the output current.

As such, the load share circuit 158 may include at least one comparator to compare current values between the floating output nodes 157 .

For example, the first load share circuit 158a, as shown in FIG. 6 , includes an amplifier 1581a, a first comparator 1582a, a second comparator 1583a, a third comparator 1584a, and switching It may include an element 1585a and an internal resistor 1586a, and the second load share circuit 158b also includes an amplifier 1581b, a first comparator 1582b, a second comparator 1583b, and a third comparator ( 1584b), a switching element 1585b, and an internal resistor 1586b.

If the amount of output current of the first floating converter 155a through the first floating output node 157a is higher than the amount of output current of the second floating converter 155b through the second floating output node 157b, the first load As the output voltage of the amplifier 1581a of the share circuit 158a increases, the first comparator 1582a of the first load share circuit 158a may output a high signal, and the second comparator 1583a and the third comparator 1584a may output a low signal.

On the other hand, as the output of the amplifier 1581b of the second load share circuit 158b decreases, it may be smaller than the signal output from the first comparator 1582a of the first load share circuit 158a and passed through the diode 1587a. . Accordingly, the first comparator 1582b of the second load share circuit 158b outputs a low signal, and the second comparator 1583b and the third comparator 1584b of the second load share circuit 158b output a high signal. can be printed out. The switching element 1585b of the second load share circuit 158b may be turned on to output the feedback signal F/B, and as a result, the output of the second floating converter 155b may be increased.

Through this, as shown in FIG. 7 , the output current amount I ₁ (eg, 4A) of the first floating converter 155a through the first floating output node 157a is the second floating output node 157b. _{The output current amount I 2} (eg, 4A) of the second floating converter 155b through The sum of the currents supplied from each of the two floating output nodes 157b (I ₀₂ ) (eg, 8A) may be supplied.

Also, a hot swap control circuit for preventing a current from flowing in a reverse direction may be connected to the floating output node 157 . The hot swap control circuit may control the switching element to prevent a reverse current in the floating output node 157 , thereby preventing loss of the floating converter 155 due to the reverse current.

Meanwhile, the load share circuit 158 may be connected to the front end of the floating output node 157 based on the current flow as shown in FIG. 5 , and according to an embodiment, the second capacitor C ₂ and the hot It may be connected to the rear end of the swap control circuit.

As a result, the power supply 150 according to an embodiment configures the signal ground of the floating converter 155 as an output node of the reference converter 153 so that the floating converter 155 can float. Accordingly, it is possible to prevent the floating converter 155 from transforming the output voltage level (the first voltage) of the reference converter 153 . That is, the floating converter 155 needs to receive the first voltage output by the reference converter 153 and transform only the second voltage.

In addition, in the power supply 150 according to an embodiment, by configuring the load share only for the floating converter 155 excluding the reference converter 153, the number of load shares can be reduced by half, and through this, Current deviation between the load-shared floating converters 155 may be minimized. In addition, since the plurality of floating converters 155 share the load with each other in a state where the output voltage of the reference converter 153 maintaining the constant voltage is used as the ground voltage, the output voltage transferred to the load connected to the floating output node is Since the fluctuation is small, it may be advantageous to the constant voltage characteristic.

Meanwhile, the disclosed embodiments may be implemented in the form of a recording medium storing instructions executable by a computer. Instructions may be stored in the form of program code, and when executed by a processor, may generate program modules to perform the operations of the disclosed embodiments. The recording medium may be implemented as a computer-readable recording medium.

The computer-readable recording medium includes any type of recording medium in which instructions readable by the computer are stored. For example, there may be read only memory (ROM), random access memory (RAM), magnetic tape, magnetic disk, flash memory, optical data storage, and the like.

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

a plurality of display modules; and

Including; at least one power supply for supplying power to the plurality of display modules;

the at least one power supply,

a rectifier circuit that converts AC power to DC power;

a plurality of reference converters for converting the DC power to a first voltage and outputting the first voltage between a reference ground node and a reference output node;

Transforms the DC power to a first voltage, outputs the first voltage between a floating ground node connected to the reference output node and a floating output node, and a plurality of floating output nodes connected in parallel floating converter; and

and a plurality of load share circuits provided at each of the plurality of floating output nodes and connected to each other so that the output currents of the plurality of floating converters are equal to each other.
According to claim 1,

Each of the plurality of display modules,

reference ground node; and

and a power supply node connected to the plurality of floating output nodes.
According to claim 1,

The plurality of reference converters and the plurality of floating converters are

A display device connected in parallel to the rectifier circuit.
According to claim 1,

Each of the plurality of floating converters,

A display device connected in series with the corresponding reference converter by using the reference output node of the corresponding reference converter as a floating ground node.
According to claim 1,

The plurality of floating converters,

A display device in which the plurality of floating output nodes corresponding to each of the plurality of floating converters are connected in parallel to each other by being connected in parallel to each other.
According to claim 1,

The plurality of reference converters,

outputting the first voltage to a load having a reference ground node;

The plurality of floating converters,

A display device for outputting a voltage corresponding to twice the first voltage to a load having a reference ground node.
According to claim 1,

The display device is

speaker; and

It further includes; a main board on which a processor for processing image data is provided;

The plurality of reference converters,

A display device for supplying power to at least one of the speaker and the main board.
According to claim 1,

The plurality of floating converters,

A display device connected to at least one display module and configured to supply power for driving a display panel to the at least one display module.
According to claim 1,

the at least one power supply,

comprising a plurality of power supplies;

Each of the plurality of power supplies,

A display device that is connected to a preset number of display modules to supply power.
According to claim 1,

A first load share circuit among the plurality of load share circuits,

Sense a current value at the first floating output node, obtain a current value at another floating output node from another load share circuit, and based on the difference in the current value between the first floating output node and the other floating output node A display device for outputting a feedback signal for controlling a switching element to the first floating converter.
According to claim 1,

Each of the plurality of floating converters,

Display devices that output equal power to each other.
a plurality of display modules; and

Including; at least one power supply for supplying power to the plurality of display modules;

the at least one power supply,

a rectifier circuit that converts AC power to DC power;

a first reference converter that transforms the DC power into a first voltage and outputs the first voltage between a reference ground node and a first reference output node;

a first floating converter that transforms the DC power into a first voltage and outputs the first voltage between a floating ground node connected to the first reference output node and a first floating output node;

a second reference converter that transforms the DC power into a first voltage and outputs the first voltage between a reference ground node and a second reference output node;

a second floating second floating voltage that transforms the DC power into a first voltage and outputs the first voltage between a floating ground node connected to the second reference output node and a second floating output node connected in parallel to the first floating output node converter;

a first load share circuit provided in the first floating output node; and

and a second load share circuit provided at the second floating output node and connected to the first load share circuit.
13. The method of claim 12,

Each of the plurality of display modules,

reference ground node; and

and a power supply node connected to the first floating output node and the second floating output node.
13. The method of claim 12,

The first reference converter and the second reference converter,

outputting the first voltage to a load having a reference ground node;

The first floating converter and the second floating converter,

A display device for outputting a voltage corresponding to twice the first voltage to a load having a reference ground node.
13. The method of claim 12,

The display device is

speaker; and

It further includes; a main board on which a processor for processing image data is provided;

The first reference converter and the second reference converter,

A display device for supplying power to at least one of the speaker and the main board.