Display device comprising power factor correction circuit comprising core for forming leakage inductance

Abstract

A display device according to one embodiment comprises: a first inductor having an end for receiving a rectified alternate current signal; a second inductor having an end for receiving the rectified alternate current signal; an inductor sub-assembly having a core wound with a first portion of the first inductor and a first portion of the second inductor; and a power-factor correction circuit including a switching circuit that switches the current induced in the first inductor and the second inductor of the inductor assembly by the rectified alternate current signal based on the voltage of the rectified alternate current signal, wherein the core of the inductor assembly comprises an extending portion extending from a first end to a second end in a first direction, and a second portion protruding in a second direction perpendicular to the first direction from a first region of the extending portion spaced apart from the first end and the second end. It may include a first protruding portion in which a first part of the first inductor is wound, and a second protruding portion in which a first part of the second inductor is wound, protruding in the second direction from a second region of the extension portion spaced apart from the first region, the first stage, and the second stage.

Description

Technology Field

[0001] The following descriptions relate to a display device including a power factor conversion circuit comprising a core that forms a leakage inductance. Background Technology

[0003] With the recent advancement of electronic technology, various types of display devices are being developed and disseminated, and the demand for large-sized display devices is increasing. As power consumption increases with the enlargement of display devices, display devices may include one or more power factor correction (PFC) circuits to stably supply this relatively high power. With the development of display devices, non-linear loads may be incorporated within the device, and harmonics generated by these non-linear loads may be introduced into the power supply system. Harmonics introduced into the power supply system can cause abnormal operation of the system. The problem to be solved

[0005] The power factor conversion circuit of a display device includes an inductor that stores electrical energy of a rectified AC signal at least temporarily, and a method to reduce the volume of the inductor assembly in which the inductor is formed may be required.

[0006] A method may be required to reduce ripple generated during the process of the power factor conversion circuit of a display device receiving current.

[0007] The technical problems to be solved in this document are not limited to those described above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this invention belongs from the description below. means of solving the problem

[0009] A display device according to one embodiment comprises: a first inductor having an end for receiving a rectified alternate current signal; a second inductor having an end for receiving the rectified alternate current signal; an inductor sub-assembly comprising a core wound with a first portion of the first inductor and a first portion of the second inductor; and a power-factor correction circuit comprising a switching circuit that switches the current induced in the first inductor and the second inductor of the inductor assembly by the rectified alternate current signal based on the voltage of the rectified alternate current signal, wherein the core of the inductor assembly comprises an extending portion extending from a first end to a second end in a first direction, and a first region of the extending portion spaced apart from the first end and the second end that is perpendicular to the first direction. It may include a first protruding portion that protrudes in a second direction and is wound with a first portion of the first inductor, and a second protruding portion that protrudes in the second direction from a second portion of the extension spaced apart from the first region, the first stage, and the second stage and is wound with a first portion of the second inductor.

[0010] A display device according to one embodiment comprises a first inductor including one end for receiving a rectified alternating current signal, a second inductor including one end for receiving the rectified alternating current signal, a first core wound with a first portion of the first inductor and a first portion of the second inductor, a second core spaced apart from the first core and arranged to intersect with a portion of the first magnetic flux, a first switching circuit connected to another end distinguished from one end of the first inductor, and a second switching circuit connected to another end distinguished from one end of the second inductor, wherein the first core may include an extension portion that is oriented toward a second direction distinguished from a first direction from the first portion of the first inductor toward the first portion of the second inductor, and another portion distinguished from the portion of the first magnetic flux is formed. In one embodiment, when the rectified alternating current signal is applied to one end of the first inductor and one end of the second inductor, a portion of the first magnetic flux induced by the first inductor may be reduced by a portion of the second magnetic flux induced by the second inductor within a first core in which the first portion of the first inductor is wound. Effects of the invention

[0012] A display device according to one embodiment accommodates a plurality of inductors based on a core having a shape for reducing the volume of an inductor assembly, thereby reducing the volume of the inductor assembly and the power circuit including the inductor assembly.

[0013] A display device according to one embodiment can reduce the ripple of a current by accommodating a plurality of inductors based on a core capable of forming a leakage inductance necessary to reduce the ripple of a current input to a power factor conversion circuit.

[0014] The effects obtainable from the present disclosure are not limited to those described above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure pertains from the description below. Brief explanation of the drawing

[0016] FIG. 1 is a block diagram of a display device according to an embodiment. FIG. 2 is a block diagram of a power circuit included in a display device according to one embodiment. FIGS. 3a to 3c are drawings illustrating an example of an inductor sub-assembly included in a display device according to one embodiment. FIGS. 4a to 4c are drawings illustrating other examples of an inductor assembly included in a display device according to one embodiment. FIGS. 5a and 5b are exemplary drawings for explaining magnetic flux induced in an inductor assembly included in a display device according to one embodiment. FIG. 6 is a circuit diagram of a power circuit included in a display device according to one embodiment. FIG. 7 is an exemplary graph for explaining the operation of a power factor conversion circuit included in a display device according to one embodiment. FIG. 8 is an exemplary graph for explaining the operation of a power factor conversion circuit included in a display device according to one embodiment. FIG. 9 is an exemplary graph for explaining the operation of a power factor conversion circuit included in a display device according to one embodiment. Specific details for implementing the invention

[0017] Hereinafter, various embodiments of this document will be described with reference to the attached drawings.

[0018] The various embodiments of this document and the terms used therein are not intended to limit the technology described in this document to specific embodiments and should be understood to include various modifications, equivalents, and / or substitutions of such embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar components. A singular expression may include a plural expression unless the context clearly indicates otherwise. In this document, expressions such as "A or B," "at least one of A and / or B," "A, B or C," or "at least one of A, B and / or C" may include all possible combinations of items listed together. Expressions such as "first," "second," "first," or "second" may modify the components, regardless of order or importance, and are used only to distinguish one component from another and do not limit the components. When it is mentioned that a certain (e.g., 1st) component is "(functionally or telecommunicationally) connected" or "connected" to another (e.g., 2nd) component, said certain component may be directly connected to said other component or connected through another component (e.g., 3rd component).

[0019] As used in this document, the term "module" includes a unit composed of hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be a component formed as a whole, or a minimum unit or part thereof that performs one or more functions. For example, a module may be composed of an application-specific integrated circuit (ASIC).

[0021] FIG. 1 is a block diagram of a display device (101) according to an embodiment. The display device (101) may be an electronic device capable of displaying images. For example, the display device (101) may include a TV (television), a computer, a smartphone, a tablet, a portable media player, a wearable device, a video wall, a digital photo frame, etc. For example, the display device (101) may be implemented as various types of devices, such as an image processing device including a set-top box that does not have a display, a home appliance including a refrigerator and a washing machine, or an information processing device including a computer main body. For convenience of explanation, the following description assumes that the display device (101) is implemented as a TV, but the embodiment is not limited thereto.

[0022] Referring to FIG. 1, a display device (101) according to one embodiment may include at least one of a power circuit (110), a main circuit (130), or a display panel (140). The power circuit (110), the main circuit (130), and the display panel (140) may be electrically and / or operably coupled with each other by electronic components, such as, for example, a power line and / or a communication bus. The type and / or number of hardware components included in the display device (101) are not limited to those shown in FIG. 1. For example, the display device (101) may include only some of the hardware components shown in FIG. 1.

[0023] Referring to FIG. 1, a power circuit (110) of a display device (101) according to one embodiment may be electrically connected to a power source (120) provided from a power distribution system. The display device (101) may include a power plug that electrically connects the power circuit (110) and the power source (120). Through the power plug, the power circuit (110) of the display device (101) may receive an alternate current signal (AC signal) from the power source (120). The alternating current signal received by the power circuit (110) is a power signal having a voltage that changes over time, for example, the voltage of the alternating current signal may change according to a sinusoidal wave having a specified frequency (e.g., 60 Hz) and a specified amplitude (e.g., 220 V and / or 110 V). A power circuit (110) of a display device (101) according to one embodiment can output a direct current signal (DC signal) having a constant voltage using an alternating current signal received from a power source (120). The direct current signal output by the power circuit (110) can correspond to a power signal having a voltage that is maintained independently of changes in time.

[0024] A display device (101) according to one embodiment may include a main circuit (130) for controlling a display panel (140). In one embodiment, the main circuit (130) may include a processor and / or memory for executing one or more functions of the display device (101). In one embodiment, the main circuit (130) may include a timing controller for generating a timing signal for outputting an image from the display panel (140). In one embodiment, the main circuit (130) may include a backlight controller for driving a backlight, such as an LED (Light Emitting Diode), included in the display panel (140).

[0025] In one embodiment, the main circuit (130) may be electrically connected to one or more switches for acquiring user input. The one or more switches may be exposed outside at least partially through the housing of the display device (101). In one embodiment, the main circuit (130) may include a communication circuit for communicating with an external electronic device for acquiring user input, such as a remote control. The communication circuit may communicate with the external electronic device based on a wireless communication protocol such as infrared communication, Bluetooth, and / or Wi-Fi. The main circuit (130) may include a Printed Circuit Board (PCB) comprising at least one of a chipset, a processor, memory, electronic components, or wiring for executing one or more functions. In one embodiment, the main circuit (130) may take the form of a System-on-Chip (SoC).

[0026] A display device (101) according to one embodiment may include a display panel (140) that is controlled by a main circuit (130) and outputs an image. By using the display panel (140), the display device (101) may output visualized information to a user. The display panel (140) may include a Flat Panel Display (FPD). The FPD may include a Liquid Crystal Display (LCD), a Plasma Display Panel (PDP), and / or one or more Light Emitting Diodes (LEDs). The LED may include an Organic LED (OLED). In one embodiment, the display panel (140) may include electronic paper.

[0027] In one embodiment, the display panel (140) may include at least one display driver integrated circuit (DDI). For example, if the display panel (140) includes a plurality of LEDs arranged in a two-dimensional matrix form, the DDI may control at least one LED included in a corresponding row or column among the plurality of LEDs. The control of at least one LED by the DDI may include an operation to adjust the luminance and / or brightness of the LEDs.

[0028] Although not illustrated, a display device (101) according to one embodiment may include output means for outputting information in a form other than a visualized form. For example, the display device (101) may further include one or more speakers for outputting an acoustic signal, which is operated by a DC signal provided from a power circuit (110).

[0029] Referring to FIG. 1, a display device (101) according to one embodiment may include a power circuit (110) that provides power to a load such as a main circuit (130) and a display panel (140). The display device (101) may include at least one of a rectifier circuit (112), a power-factor correction circuit (114), an electromagnetic interference (EMI) filter (116), or a DC-DC conversion circuit (118) within the power circuit (110). Hardware components included in the power circuit (110) are not limited to the example of FIG. 1, and, for example, the power circuit (110) may further include circuits such as a lightning protection circuit, a varistor, and a surge arrester.

[0030] A rectifier circuit (112) according to one embodiment can rectify an alternating current signal of a power source (120) and output a rectified alternating current signal. To rectify the alternating current signal, the rectifier circuit (112) may include one or more diodes. For example, the rectifier circuit (112) may include a bridge diode circuit that performs full-wave rectification on the alternating current signal of the power source (120). For example, the power source (120) may perform half-wave rectification on the alternating current signal. The circuit included in the rectifier circuit (112) is not limited to the bridge diode and may include a non-bridge type circuit.

[0031] An EMI filter (116) according to one embodiment may remove or reduce noise included in an AC signal of a power source (120). The noise may include voltage ripple caused by other frequency components that differ from the frequency components of the AC signal intended by the producer generating the AC signal. For example, an AC signal having noise reduced by the EMI filter (116) may be provided to a rectifier circuit (112). For example, the EMI filter (116) may include a line filter.

[0032] A power factor conversion circuit (114) according to one embodiment can adjust the power factor (PF) of an AC signal and / or a DC signal provided to a power circuit (110). The power factor refers to the ratio between the active power consumed by the load and the apparent power provided to the load. For example, the power factor conversion circuit (114) can adjust the power factor by reducing the reactive power of the AC signal. For example, the power factor conversion circuit (114) can adjust the power factor by increasing the active power of the AC signal. A power factor conversion circuit (114) according to one embodiment can adjust the power factor by synchronizing the phases of the voltage and current of the AC signal received by the display device (101). A power factor conversion circuit (114) included in the display device (101) according to one embodiment will be described later through the description of FIGS. 2 to 9.

[0033] A display device (101) according to one embodiment can obtain a DC signal from an AC signal of a power source (120) based on a power factor conversion circuit (114). A display device (101) according to one embodiment can change the power factor at the input side of the display device (101) (e.g., an end of the display device (101) connected to the power source (120)) based on the power factor conversion circuit (114). For example, the display device (101) can receive current based on the phase of the voltage of the AC signal of the power source (120) to improve the power factor in the power line connecting the power source (120) and the display device (101). The power factor in the power line connecting the power source (120) and the display device (101) can, for example, exceed a specified power factor threshold related to harmonic regulation. An example of a display device (101) according to one embodiment acquiring a DC signal from an AC signal using a power factor conversion circuit (114) will be described later through the description of FIG. 2.

[0034] A power factor conversion circuit (114) of a display device (101) according to one embodiment may include a plurality of inductors that store magnetic energy using a magnetic field. A power factor conversion circuit (114) according to one embodiment may include one or more cores that are accommodable to the plurality of inductors. The relative position of the plurality of inductors within the power factor conversion circuit (114) may be based at least on the shape of the one or more cores. The shape of the one or more cores may have a shape related to the interaction of magnetic flux induced in the plurality of inductors. For example, the shape of the one or more cores may have a shape related to at least one of magnetization inductance or leakage inductance related to the interaction of the magnetic field. The shape of the one or more cores included in the power factor conversion circuit (114) according to one embodiment will be described later through the description of FIGS. 3a to 3c and FIGS. 4a to 4c. The magnetizing inductance or the leakage inductance formed by the one or more cores included in the power factor conversion circuit (114) according to one embodiment will be described later through the description of FIG. 5a and 5b.

[0035] A DC-DC conversion circuit (118) according to one embodiment can convert a DC signal provided based at least on a power factor conversion circuit (114) into a DC signal having a specified voltage for the operation of the main circuit (130) and the display panel (140). For example, the DC-DC conversion circuit (118) can apply different DC voltages required by each of the hardware components of the display device (101). The DC-DC conversion circuit (118) may include at least one of an isolated DC-DC converter, a flyback converter, or a forward converter.

[0036] As described above, a display device (101) according to one embodiment may provide the inductance required for the operation of a power factor conversion circuit (114) by including one or more cores having a shape related to the interaction of magnetic fields induced in the plurality of inductors within a power factor conversion circuit (114) including a plurality of inductors. By including one or more cores having a shape related to the interaction of magnetic fields induced in the plurality of inductors included in the power factor conversion circuit (114) of the display device (101) according to one embodiment, the power factor conversion circuit (114) may have a relatively light weight and / or a relatively small volume. Hereinafter, with reference to FIG. 2, an embodiment of a power circuit (110) of a display device (101) is described.

[0038] FIG. 2 is a block diagram of a power circuit (110) included in a display device according to one embodiment. The display device of FIG. 2 may include the display device (101) of FIG. 1. The power circuit (110) of FIG. 2 may correspond to the power circuit (110) of FIG. 1. The power source (120), rectifier circuit (112), and power factor conversion circuit (114) of FIG. 2 may correspond to the power source (120), rectifier circuit (112), and power factor conversion circuit (114) of FIG. 1, respectively. In one embodiment, the rectifier circuit (112) and the power factor conversion circuit (114) may include a PCB or one or more circuit elements placed on a PCB, or may be included in one or more integrated circuits. Hereinafter, descriptions that overlap with FIG. 1 are omitted for convenience.

[0039] Referring to FIG. 2, a power factor conversion circuit (114) according to one embodiment may include at least one of an inductor assembly (210), a switching circuit (220), or a control circuit (230). The inductor assembly (210) of the power factor conversion circuit (114) may include a plurality of inductively coupled inductors. Referring to FIG. 2, in one embodiment in which an inductor assembly (210) includes two inductors, the inductor assembly (210) may include a terminal (210-1) corresponding to an end of the first inductor among the two inductors, a terminal (210-3) corresponding to another end of the first inductor, a terminal (210-2) corresponding to an end of the second inductor that is distinct from the first inductor among the two inductors, and a terminal (210-4) corresponding to the other end of the second inductor.

[0040] In one embodiment in which an inductor assembly (210) comprises two inductors, the two inductors of the inductor assembly (210) may be wound around one or more cores of the inductor assembly (210) such that the magnetic flux induced by the current input at each of the stages (210-1, 210-2) intersects with each other within the two inductors. By the magnetic flux induced by the current input at each of the stages (210-1, 210-2) intersects with each other within the two inductors, the two inductors of the inductor assembly (210) may form a differential mode coupled inductor.

[0041] Referring to FIG. 2, each of the terminals (210-3, 210-4) corresponding to each of the plurality of inductors included in the inductor assembly (210) can be connected to the terminals (220-1, 220-2) of the switching circuit (220). The switching circuit (220) can be connected to each of the terminals (230-1, 230-2) of the control circuit (230) through the terminals (220-3, 220-4). The switching circuit (220) can output at least one of the power signals of the inductor assembly (210) received at each of the terminals (220-1, 220-2) to at least one of the terminals (220-5, 220-6) based on at least one of the control signals input through each of the terminals (220-3, 220-4). In one embodiment in which the inductor assembly (210) includes two inductors, the switching circuit (220) of the power factor conversion circuit (114) may operate based on an interleaved boost method based on a specified phase difference (e.g., a phase difference of 180°) based on the control circuit (230). An example of a detailed circuit diagram of the inductor assembly (210) and the switching circuit (220) operating based on the interleaved boost method will be described later through the description of FIG. 6.

[0042] Referring to FIG. 2, a power factor conversion circuit (114) included in a power circuit (110) of a display device according to one embodiment may be electrically connected to other circuits distinct from the power factor conversion circuit (114) through one or more nodes (240, 260). Hereinafter, a node may refer to a part of a circuit connecting circuit elements to one another, where there is substantially no potential difference. For example, a node may correspond to a conductor within a circuit connecting circuit elements. Referring to FIG. 2, at least one of the circuit elements of a display device including a power circuit (110) may be connected to a ground node (290). Hereinafter, a ground node is a node having substantially the same potential as earth, and may include a digital ground node and / or an analog ground node.

[0043] Referring to FIG. 2, the power factor conversion circuit (114) may be connected to the rectifier circuit (112) through a node (240). At the node (240), terminals (210-1, 210-2) of the power factor conversion circuit (114) may be connected in parallel with the rectifier circuit (112). Referring to FIG. 2, the power circuit (110) may include a capacitor (250) having one terminal connected to the node (240) and the other terminal connected to the ground node (290). At the node (240), terminals (210-1, 210-2) of the power factor conversion circuit (114) may be connected in parallel with the rectifier circuit (112) and the capacitor (250). The AC signal of the power source (120) may be rectified by the rectifier circuit (112). The alternating current signal rectified by the rectifier circuit (112) can be applied to the node (240). As the capacitor (250) is connected to the node (240), the ripple contained in the voltage of the rectified alternating current signal applied to the node (240) can be reduced. Although not shown, a line filter can be connected to the node (240) and / or the rectifier circuit (112), independently of the capacitor (250), to reduce the ripple contained in the alternating current signal and / or the ripple of the current input to the power factor conversion circuit (114) through the node (240).

[0044] Referring to FIG. 2, the power circuit (110) may include a capacitor (270) having one end connected to a node (260) and the other end connected to a ground node (290). For example, the capacitor (270) may include at least one of an electrolytic capacitor, a film capacitor, or a multilayer ceramic capacitor (MLCC). At the node (260), the ends (220-5, 220-6) of the power factor conversion circuit (114) may be connected in parallel with the capacitor (270). A power signal provided by the power factor conversion circuit (114) may be applied to the node (260). As the capacitor (270) is connected to the node (260), the ripple contained in the voltage of the power signal of the power factor conversion circuit (114) applied to the node (260) may be reduced. Referring to FIG. 2, the power circuit (110) may include a resistor (280) having one end connected to a node (260) and the other end connected to a ground node (290). Based on a capacitor (270) charged by a power signal of the power factor conversion circuit (114), DC power (e.g., V OUT DC power having a voltage) can be provided to other circuits connected to the node (260) in the display device. For example, the DC-DC conversion circuit (118) of FIG. 1 can generate DC signals having different voltages from power charged by the capacitor (270). The DC signals generated by the DC-DC conversion circuit (118) can be provided to the main circuit (130) and / or the display panel (140) of FIG. 1.

[0045] As described above, a display device according to one embodiment can reduce the saturation current of each of the plurality of inductors by forming a differential mode coupled inductor within an inductor assembly (210) comprising a plurality of inductors. As the saturation current of each of the plurality of inductors is reduced, the volume of each of the plurality of inductors can be reduced. As the volume of each of the plurality of inductors is reduced, the volume of the inductor assembly (210) and the volume of the power circuit (110) including the inductor assembly (210) can be reduced. An example of reducing the saturation current of each of the plurality of inductors will be described later through the description of FIGS. 7 to 9.

[0046] Hereinafter, with reference to FIGS. 3a to 3c, an exemplary structure of an inductor assembly (210) comprising a plurality of inductively coupled inductors is described.

[0048] FIGS. 3a to 3c are drawings illustrating an example of an inductor assembly (210) included in a display device according to one embodiment. The display device of FIGS. 3a to 3c may include the display device (101) of FIG. 1. The inductor assembly (210) of FIGS. 3a to 3c may correspond to the inductor assembly (210) of FIG. 2.

[0049] FIG. 3a is an exploded view of an inductor assembly (210) included in a display device according to one embodiment. The inductor assembly (210) according to one embodiment may include at least one of cores (310, 360), bobbins (320, 330), or inductors (340, 350). The inductor assembly (210) according to one embodiment may further include a thin film (e.g., the thin film (390) of FIG. 3c) wrapping the cores (310, 360), bobbins (320, 330), and inductors (340, 350). For convenience of explanation, the illustration of the thin film is omitted in FIG. 3a and FIG. 3b.

[0050] The cores (310, 360) of the inductor assembly (210) may be ferrite cores comprising, for example, at least one of manganese-zinc (MnZn) ferrite or nickel-zinc (NiZn) ferrite. The bobbins (320, 330) may comprise at least one of plastic or ceramic, for example, bakelite. The inductors (340, 350) may comprise wires based on a conductive material.

[0051] Referring to FIG. 3a, an inductor assembly (210) according to one embodiment may include a core (e.g., cores (310, 360)) that accommodates at least a portion of magnetic flux directed toward a different space distinct from the space between the inductors (340, 350). Referring to FIG. 3a, the core (310) may include an extending portion (316) having a length and a width, and protrusions (312, 314) that protrude from the extending portion (316) along the longitudinal direction of the extending portion (316). For example, the core (310) may include the extending portion (316) and protrusions (312, 314) that protrude from a surface of the extending portion (316) and are inserted into the openings (325, 335) of each of the bobbins (320, 330). On one side of the extension (316), the protrusions (312, 314) may be spaced apart from each other. Each of the protrusions (312, 314) may be spaced apart from at least one edge of the extension (316).

[0052] Referring to FIG. 3a, an inductor assembly (210) according to one embodiment may include a bobbin (e.g., bobbins (320, 330)) on which an inductor (e.g., inductors (340, 350)) is directly wound. The bobbin may include a tube portion into which a protrusion of a core is inserted. A wire may be wound around the outer circumference of the tube portion to form an inductor. For example, referring to FIG. 3a, openings (325, 335) formed by each of the tube portions of the bobbins (320, 330) and inductors (340, 350) wound around the outer circumference of the tube portion are shown. The bobbin may include a flange portion extending from the edge of the tube portion in a direction perpendicular to the longitudinal direction of the tube portion.

[0053] According to one embodiment, at least one end of an inductor may be extended on the flange portion of a bobbin of an inductor assembly (210). Referring to FIG. 3a, at least one end of an inductor (340) may be extended on the flange portion of a bobbin (320) on which an inductor (340) is wound. At least one end of an inductor (350) may be extended on the flange portion of a bobbin (330) on which an inductor (350) is wound. The at least one end of the inductor extended on the flange portion may be electrically connected to the inductor assembly (210) and other circuits (e.g., rectifier circuit (112) of FIG. 1 and 2, switching circuit (220) of FIG. 2) and / or other nodes (e.g., node (240) of FIG. 2). For example, at least one end of the inductor (340) extended on the flange portion of the bobbin (320) may include the ends (210-1, 210-3) of FIG. 2. In the above example, at least one end of the inductor (350) extended on the flange portion of the bobbin (330) may include the ends (210-2, 210-4) of FIG. 2.

[0054] Referring to FIG. 3a, the core (360) may include an extension (366) similar to the core (310) and protrusions (362, 364) that protrude from the extension (366) and are inserted into the openings (325, 335) of each of the bobbins (320, 330). The protrusion (362) of the core (360) may be inserted into the opening (325) of the bobbin (320) in a direction other than the one in which the protrusion (312) of the core (310) is inserted into the opening (325) of the bobbin (320) (e.g., opposite to said one direction). The protrusion (364) of the core (360) can be inserted into the opening (335) of the bobbin (330) in a direction distinct from the direction in which the protrusion (314) of the core (310) is inserted into the opening (335) of the bobbin (330) (e.g., opposite to said direction).

[0055] FIG. 3b is a prospective view of an inductor assembly (210) included in a display device according to one embodiment. As each of the protrusions (312, 314, 322, 324) of each of the cores (310, 320) is inserted into the openings (325, 335) of the bobbins (320, 330), at least a portion of the inductors (340, 350) wound on the bobbins (320, 330) can be wound on each of the protrusions (312, 314, 322, 324). As each of the protrusions (312, 314, 322, 324) of the cores (310, 320) is inserted into the openings (325, 335) of the bobbins (320, 330), the flange portions of the bobbins (320, 330) may contact the surfaces of the extensions (316, 366) of the cores (310, 320).

[0056] In one embodiment illustrated in FIG. 3b, the size of the flange portions of the bobbins (320, 330) may correspond to the size of the extension portions of the cores (310, 320) that contact the flange portions. In this case, at least a portion of the edge of the flange portions of the bobbins (320, 330) may contact at least a portion of the edge of the extension portions (316, 366) of the cores (310, 320). For example, the flange portions of the bobbins (320, 330) may form a substantially continuous plane with the faces of the extension portions (316, 366). However, embodiments are not limited to the one embodiment illustrated in FIG. 3b.

[0057] In one embodiment illustrated in FIG. 3b, in a state where the flange portions of the bobbins (320, 330) are in contact with the surfaces of the extension portions (316, 366) of the cores (310, 320), the inductors (340, 350) wound on the bobbins (320, 330) may be electrically insulated from the cores (310, 320). Referring to FIG. 3b, the ends of the inductors (340, 350) extended on the flange portions may be connected to pins (345, 355) spaced apart from the cores (310, 320). For example, the pins (345) connected to the inductor (340) wound on the bobbin (320) may correspond to the terminals (210-1, 210-3) of FIG. 2. In the above example, the pins (355) connected to the inductor (350) wound on the bobbin (330) may correspond to the terminals (210-2, 210-4) of FIG. 2. For example, the number of each pin (345, 355) may correspond to the number of terminals of the corresponding inductor, or may exceed the number of terminals of the corresponding inductor in order to branch and receive the current associated with the inductor. Referring to FIG. 3b, the number of pins (345) corresponding to the inductor (340) may be four, since two pins are connected to each terminal of the inductor (340).

[0058] As described above, the volume of the inductor assembly (210) can be reduced as the inductor assembly (210) includes cores (310, 320) capable of accommodating all of the inductors (340, 350), independently of individually accommodating the inductors (340, 350). As the inductors (340, 350) included in the inductor assembly (210) form an inductive coupling, the inductor assembly (210) can provide at least one of a magnetizing inductance, a leakage inductance, or a coupling factor to a power factor conversion circuit (e.g., the power factor conversion circuit (114) of FIGS. 1 and 2) for driving the power factor conversion circuit (114). For example, the inductor assembly (210) can provide a relatively low coupling factor or a relatively low magnetizing inductance while providing a relatively high leakage inductance. As the inductor assembly (210) provides a relatively high leakage inductance, the ripple contained in the current input to the inductor assembly (210) (e.g., the current of an alternating current signal rectified by the rectifier circuit (112) of FIGS. 1 and 2) can be reduced.

[0059] FIG. 3c is a cross-section view along line AA' of FIG. 3b. For convenience of explanation, the inductors (340, 350) are shown in a shape where the inductors (340, 350) are wound on each of the bobbins (320, 330) instead of a cross-section view of the inductors (340, 350). Each of the inductors (340, 350) of the inductor assembly (210) according to one embodiment may include a terminal (e.g., terminals (210-1, 210-2)) connected to a rectifier circuit (e.g., rectifier circuit (112) of FIG. 1 and 2) to receive an alternating current signal rectified by the rectifier circuit. The other end of each of the inductors (340, 350) distinct from the above-mentioned first end (e.g., ends (210-3, 210-4)) can be connected to a switching circuit (e.g., the switching circuit (220) of FIG. 2) that operates to receive a current having a phase corresponding to the phase of the voltage of the rectified AC signal.

[0060] Referring to FIG. 3c, as the protrusions (312, 314, 362, 364) of the cores (310, 360) are inserted into the openings of each of the bobbins (320, 330), the protrusions (312, 314, 362, 364) can be wound onto at least a portion of the corresponding inductor among the inductors (340, 350). For example, the protrusion (312) of the core (310) can be wound onto a portion of the inductor (340). For example, the protrusion (362) of the core (360) can be wound onto another portion of the inductor (340). For example, the protrusion (314) of the core (310) can be wound onto a portion of the inductor (350). For example, the protrusion (364) of the core (360) can be wound around another part of the inductor (350).

[0061] Referring to FIG. 3c, the core (310) of an inductor assembly (210) according to one embodiment may include an extension (316) extending from a first end (316-1) to a second end (316-2) in a first direction. In one embodiment, the core (310) may include a protrusion (312) that protrudes in a second direction perpendicular to the first direction from a region (316-3) of the extension (316) spaced apart from the first end (316-1) and the second end (316-2), and on which a first portion of the inductor (340) is wound. In one embodiment, the core (310) may include a protrusion (314) in which a first portion of an inductor (314) is wound, which protrudes in a second direction from a region (316-4) of an extension (316) spaced apart from a region (316-3), a first stage (316-1), and a second stage (316-2).

[0062] Referring to FIG. 3c, an inductor assembly (210) according to one embodiment may include a core (360) on which a second portion distinct from the first portion in the inductor (340) and a second portion distinct from the first portion in the inductor (350) are wound. The core (360) may include an extension (366) extending from a first end (366-1) to a second end (366-2) in a first direction of the core (310). The core (360) may include a protrusion (362) on which a second portion of the inductor (340) is wound, which protrudes from a region (366-3) spaced apart from the first end (366-1) and the second end (366-2). The core (360) may include a protrusion (364) that protrudes from a region (366-4) spaced apart from the region (366-3), the first stage (366-1), and the second stage (366-2), and on which the second part of the inductor (350) is wound.

[0063] Referring to FIG. 3c, the bobbin (320) of the inductor assembly (210) according to one embodiment may include a tube portion into which the protrusion (312) of the core (310) and the protrusion (362) of the core (360) are inserted, and the first portion and the second portion of the inductor (340) are wound. The bobbin (330) of the inductor assembly (210) according to one embodiment may include a tube portion into which the protrusion (314) of the core (310) and the protrusion (364) of the core (360) are inserted, and the first portion and the second portion of the inductor (350) are wound. For example, the length of the tube portion of the bobbin (330) may correspond to the length of the tube portion of the bobbin (320). For example, the length of the tube portion of the bobbin (320) may exceed the sum of the length of the protrusion (312) and the length of the protrusion (362).

[0064] Referring to FIG. 3c, an air gap (370) formed within the tube portion is shown as the length of the tube portion of the bobbin (320) exceeds the sum of the length of the protrusion (312) and the length of the protrusion (362). As the air gap (370) is formed within the tube portion of the bobbin (320), one end of the protrusion (312) of the core (310) may be faced away from one end of the protrusion (362) of the core (360) within the tube portion. In one embodiment where the length of the tube portion of the bobbin (330) corresponds to the length of the tube portion of the bobbin (320), an air gap (380) may be formed within the tube portion of the bobbin (330) in a manner similar to how the air gap (370) is formed within the tube portion of the bobbin (320). In one embodiment where the length of the tube portion of the bobbin (330) corresponds to the length of the tube portion of the bobbin (320), the thicknesses of the voids (370, 380) may match each other.

[0065] Referring to FIG. 3c, an inductor assembly (210) according to one embodiment may further include a thin film (390) covering cores (310, 360), bobbins (320, 330), and inductors (340, 350). The thin film (390) may be formed by performing taping after the protrusions (312, 314, 362, 364) of each of the cores (310, 360) are inserted into the openings (325, 335) of each of the bobbins (320, 330) around which the inductors (340, 350) are wound. The thin film (390) may comprise an electrically insulating material. As the thin film (390) wraps around the cores (310, 360), bobbins (320, 330), and inductors (340, 350), the relative positions of each of the cores (310, 360), bobbins (320, 330), and inductors (340, 350) within the thin film (390) can be fixed. As the relative positions are fixed by the thin film (390), the size of the gaps (370, 380) can also be fixed within the bobbins (320, 330). For example, in one embodiment where the length of the tube portion of the bobbin (330) corresponds to the length of the tube portion of the bobbin (320), the size of each of the gaps (370, 380) can be maintained without any variation in size between the gaps (370, 380).

[0066] Referring to FIG. 3c, the length between the region (316-3) of the extension (316) where the protrusion (312) extends from the core (310) and the first section (316-1) adjacent to the region (316-3) may correspond to the length of the flange portion extending from the tube portion of the bobbin (320). In this case, at least a portion of the edge of the extension (316) may be in contact with the edge of the flange portion of the bobbin (320). As a method for forming the thin film (390) (e.g., taping) is performed with at least a portion of the edge of the extension (316) in contact with the edge of the flange portion of the bobbin (320), the relative positions of the cores (310, 360) and bobbins (320, 330), respectively, may be fixed within the thin film (390). As the relative positions of the cores (310, 360) and bobbins (320, 330) are stably fixed by the formation of the thin film (390), the production yield of the inductor assembly (210) can be improved.

[0067] As described above, as the inductor assembly (210) is assembled based on the cores (310, 360) shown in FIGS. 3a through 3c, the inductors (340, 350) contained within the inductor assembly (210) can form an inductively coupled inductor (e.g., a differential mode coupled inductor). As the extensions (316, 366) of the cores (310, 360) extend flatly between the protrusions (312, 314, 362, 364) around which the inductors (340, 350) are wound, the window area of ​​the inductor assembly (210) can be utilized to the maximum extent. As described below through the explanation of FIG. 5a, the inductors (340, 350) included in the inductor assembly (210) can be wound such that the magnetic fluxes of the inductors (340, 350) generated by the current received at each of the stages (210-1, 210-2) are canceled out in the interior of the cores (310, 360) in which each of the inductors (340, 350) is wound (e.g., protrusions (312, 314, 362, 364)).

[0068] Hereinafter, with reference to FIGS. 4a to 4c, an embodiment of an inductor assembly including cores having shapes different from the cores (310, 360) of FIGS. 3a to 3c is described.

[0070] FIGS. 4a to 4c are drawings illustrating other examples of an inductor assembly (215) included in a display device according to one embodiment. The display device of FIGS. 4a to 4c may include the display device (101) of FIG. 1. The inductor assembly (215) of FIGS. 4a to 4c may correspond to the inductor assembly (210) of FIG. 2.

[0071] FIG. 4a is an exploded perspective view of an inductor assembly (215) included in a display device according to one embodiment. The inductor assembly (215) according to one embodiment may include at least one of cores (410, 420), bobbins (320, 330), inductors (340, 350), or a thin film (390). For convenience of explanation, the illustration of the thin film (390) is omitted in FIG. 4a and 4b. In the description of the bobbins (320, 330) and inductors (340, 350), a description similar to FIG. 3a and 3c is omitted.

[0072] Referring to FIG. 4a, the core (410) of an inductor assembly (215) according to one embodiment may include an extension (416) having a length and a width, and protrusions (412, 414) protruding from the extension (416) along the longitudinal direction of the extension (416). The protrusions (412, 414) may protrude along the direction in which the one surface of the extension (416) faces, on one surface of the extension (416) spaced apart from the edge of the extension (416). Referring to FIG. 4a, the protrusions (412, 414) of the core (410) may be inserted into each of the openings (325, 335) of each of the bobbins (320, 330). Inductors (340, 350) can be wound onto tube portions forming openings (325, 335) in each of the bobbins (320, 330).

[0073] Referring to FIG. 4a, the core (420) of an inductor assembly (215) according to one embodiment may include an extension (425) having a length and width corresponding to the length and width, respectively, of the extension (416) of the core (410). Independently of the extension (416) of the core (410), the extension (425) of the core (420) may be extended flatly along the length direction and the width direction. As the extension (425) of the core (420) is extended smoothly along the length direction and the width direction, one side of the extension (425) may come into contact with the flange portions of each of the bobbins (320, 330). One side of the extension (425) in contact with the flange portions of each of the bobbins (320, 330) may be spaced apart from the ends of the protrusions (412, 414) inserted into the openings of each of the bobbins (320, 330).

[0074] FIG. 4b is a perspective view of an inductor assembly (215) included in a display device according to one embodiment. As the protrusions (412, 414) of the core (410) are inserted into each of the openings (325, 335), inductors (340, 350) can be wound around each of the protrusions (412, 414). As the extension (425) of the core (420) extends flatly in the longitudinal and width directions, the core (420) can come into contact with the flange portions of each of the bobbins (340, 350), independently of being inserted into the openings (325, 335) of each of the bobbins (340, 350). For example, the core (420) can come into contact with the edge of each of the tube portions included in the bobbins (340, 350).

[0075] As described above, as the inductors (340, 350) included in the inductor assembly (215) utilize a single core (e.g., core (410)), the volume of the inductor assembly (215) can be reduced.

[0076] FIG. 4c is a cross-sectional view along line AA' of FIG. 3b. For convenience of explanation, the inductors (340, 350) are shown in a shape where the inductors (340, 350) are wound on each of the bobbins (320, 330), rather than in a cross-sectional view of the inductors (340, 350). Referring to FIG. 4c, similar to FIG. 3c, the inductors (340, 350) can be wound on each of the bobbins (320, 330) such that the magnetic flux induced by the current received at each of the stages (210-1, 210-2) is canceled out at the protrusions (412, 414) on which each of the inductors (340, 350) is wound. With the inductors (340, 350) receiving current from the terminals (210-1, 210-2), the current modified by the canceled magnetic flux can be output from the terminals (210-3, 210-4).

[0077] A core (410) of an inductor assembly (215) according to one embodiment may include an extension (416) extending from a first end (416-1) to a second end (416-2) in a first direction. The core (410) may include protrusions (412, 414) protruding in a second direction perpendicular to the first direction in regions (416-3, 416-4) spaced apart from the first end (416-1) and the second end (416-2). The first direction may correspond to the longitudinal direction of the extension (416). Referring to FIG. 4c, with each of the protrusions (412, 414) inserted into the openings (325, 335) of the bobbins (320, 330), each of the protrusions (412, 414) can fill most of the tube portion of the bobbins (320, 330) on which each of the inductors (340, 350) is wound.

[0078] Referring to FIG. 4c, the core (420) of an inductor assembly (215) according to one embodiment may include an extension (425) extending from a first end (425-1) corresponding to a first end (416-1) of the core (410) to a second end (425-2) corresponding to a second end (416-2) of the core (410). For example, the direction from the first end (425-1) of the core (420) to the second end (416-2) may be parallel to the direction from the first end (416-1) of the core (410) to the second end (416-2). The extension (425) of the core (420) may be in contact with the edge of the tube portion of each of the bobbins (320, 330). One side of the extension (425) of the core (420) adjacent to the edge of the tube portions may be spaced apart from the ends of the protrusions (412, 414) of the core (410).

[0079] Referring to FIG. 4c, as one side of the extension (425) of the core (420) is spaced apart from the ends of the protrusions (412, 414) of the core (410), voids (430, 440) may be formed within the tube portions of the bobbins (320, 330), in the portion of the core (420) and the core (410) adjacent to the core (420). In one embodiment where the lengths of the tube portions of the bobbins (320, 330) match each other, the volumes of the voids (430, 440) may match each other. For example, the length of the tube portions of the bobbins (320, 330) may exceed the length of the protrusions (412, 414) of the core (410).

[0080] Referring to FIG. 4c, an inductor assembly (215) according to one embodiment may further include a thin film (390) covering cores (310, 360), bobbins (320, 330), and inductors (340, 350). The thin film (390) may fix a core (425) having an extension (425) independent of a protrusion inserted into each opening (325, 335) of the bobbins (320, 330), in a direction parallel to the extension (416) of the core (410) within the inductor assembly (215). For example, the thin film (390) can fix the cores (410, 420) within the inductor assembly (215) such that the first end (425-1) and the second end (425-2) of the extension (425) of the core (420) are each parallel to the first end (416-1) and the second end (416-2) of the extension (415) of the core (410).

[0081] As described above, the inductors (340, 350) may be arranged such that, within the inductor assembly (215), while receiving current through each of the stages (210-1, 210-2), the magnetic fluxes of each of the inductors (340, 350) induced by the received current within the wound protrusions (412, 414) of the inductors (340, 350) are directed in different directions. At least some of the magnetic fluxes of each of the inductors (340, 350) may be formed to be directed from the regions (416-3, 416-4) toward the stages (416-1, 416-2).

[0082] Hereinafter, with reference to FIGS. 5a to 5b, an embodiment is described in which each of the inductor assemblies (210, 215) of FIGS. 3a to 3c and FIGS. 4a to 4c forms a magnetic flux by a current received from the stages (210-1, 210-2).

[0084] FIGS. 5a and 5b are exemplary drawings for illustrating magnetic flux induced in an inductor assembly included in a display device according to one embodiment. The display device of FIGS. 5a and 5b may include the display device (101) of FIG. 1. The inductor assembly of FIGS. 5a and 5b may correspond to the inductor assembly (210) of FIG. 2.

[0085] FIG. 5a is an exemplary diagram illustrating the magnetic flux induced in the inductor assembly (210) of FIG. 3a to 3c. Each of the inductors (340, 350) included in the inductor assembly (310) can receive current through the terminals (210-1, 210-2). For example, an alternating current signal rectified by the rectifier circuit (112) of FIG. 1 to 2 can be input to each of the inductors (340, 350) through the terminals (210-1, 210-2). The current received through the terminals (210-1, 210-2) can pass through the wound wires of the inductors (340, 350) and be output to the terminals (210-3, 210-4).

[0086] In one example where current moves from terminal (210-1) to terminal (210-3) of the inductor (340), magnetic flux due to said current may be generated in the inductor (340). Since the inductors (340, 350) form inductive coupling within the inductor assembly (210), at least a portion of the magnetic flux generated in the inductor (340) may be changed by the inductor (350). The aforementioned change in magnetic flux may cause a difference between the magnitude of the current output at terminal (210-3) and the magnitude of the current output at terminal (210-1). In a state where current moves from terminal (210-2) to terminal (210-4) of the inductor (350), similar to the above example, a change in the magnetic flux of the inductor (350) due to the inductor (340) may occur.

[0087] Referring to FIG. 5a, magnetic fluxes (510, 520, 530, 540) induced in each of the inductors (340, 350) are illustrated while the inductor assembly (210) receives an alternating current signal rectified through the terminals (210-1, 210-2). The magnetic fluxes (510, 530) may be formed by the inductor (340) receiving the alternating current signal rectified through the terminal (210-1). The magnetic flux formed in the inductor (340) may be radiated from the protrusion (312) of the core (310) around which the inductor (340) is wound to the region (316-3) of the extension (310) where the protrusion (312) is formed, and then radiated from the region (316-3) to another region of the extension (316) that is distinct from the region (316-3). Since the magnetic flux forms a closed loop, the magnetic flux formed in the inductor (340) can converge into the region (366-3) and / or the protrusion (362) around which the inductor (340) is wound within the core (360). The magnetic fluxes (520, 540) can be formed by an inductor (350) that receives an alternating current signal rectified through the terminal (210-2). The magnetic flux formed in the inductor (350) can also radiate from the region (316-4) of the core (310) around which the inductor (350) is wound to another region of the extension (316) distinct from the region (316-4), and then converge into the protrusion (364) and / or region (366-4) of the core (360) around which the inductor (350) is wound.

[0088] Referring to FIG. 5a, in one embodiment in which inductors (340, 350) form a differential mode coupled inductor, the magnetic fluxes (510, 520) formed by each of the inductors (340, 350) may intersect each other in a portion of the extension (316) between the protrusions (312, 314, 362, 364) and protrusions (312, 315) of the cores (310, 360). For example, the directions of the magnetic fluxes (510, 530) may be opposite to each other within the cores (310, 360).

[0089] Referring to FIG. 5a, in one example where inductors (340, 350) form a differential mode coupled inductor, the magnetic flux (530) formed by the inductor (340) can be formed from the region (316-3) of the extension (316) where a protrusion (312) corresponding to the inductor (340) is formed toward the first end (316-1) adjacent to the region (316-3) among the first end (316-1) and the second end (316-2) of the extension (316). Since the magnetic flux (530) is formed in a direction distinct from the direction (e.g., from region (316-3) to region (316-4)) and the direction (e.g., from region (316-3) to the first stage (316-1)) of the inductor (350) inductively coupled with the inductor (340) corresponding to the magnetic flux (530) based on the shape of the extension (316) of the core (310), the leakage inductance of the differential mode coupled inductor formed by the inductors (340, 350) can be increased.

[0090] Referring to FIG. 5a, the magnetic flux (540) formed by the inductor (350) can also be formed in a direction opposite to the direction toward the inductor (340) inductively coupled with the inductor (350), similar to the magnetic flux (530). For example, the magnetic fluxes (530, 540) may correspond to leakage magnetic flux, which is magnetic flux independent of the inductive coupling between the inductors (340, 350). The magnetic flux (540) formed in the opposite direction may be formed based on a part of the extension (316) between the region (316-4) corresponding to the protrusion (314) around which the inductor (350) is wound and the second end (316-2) of the extension (316). For example, the extension (316) of the core (310) may include a portion for forming a magnetic flux (540) in a different direction distinct from the direction from the inductor (350) to the inductor (340) while the inductor (350) receives current through the terminal (210-2). For example, the extension (316) may include a portion between the region (316-4) where the protrusion (314) is formed and the second terminal (316-2). As the extension (316) includes a portion between the region (316-3) and the first terminal (316-1), and a portion between the region (316-4) and the second terminal (316-2), magnetic fluxes (530, 540) associated with leakage inductance may be formed within the inductor assembly (210). The leakage inductance associated with the magnetic fluxes (530, 540) can reduce the ripple of the current received by the power factor conversion circuit (e.g., the power factor conversion circuit (114) of FIG. 2) including the inductor assembly (210).

[0091] In one embodiment where inductively coupled inductors (340, 350) form a differential mode coupled inductor, the leakage inductance L of the differential mode coupled inductor lk The inductance L of the inductors (340, 350) in a state where a short circuit is formed between the terminals (210-2, 210-3) of the inductor assembly (210). aBased on this, it can be measured as in mathematical formula 1.

[0092]

[0093] Leakage inductance L in Equation 1 lk The inductor (340, 350) may be proportional to the number of turns wound on the bobbins (320, 330) for each. Referring to FIG. 5a, since each core (310, 360) includes a portion for forming a leakage flux (e.g., flux (530, 540)), the leakage inductance L lk The leakage inductance L can be modified based on a portion for forming leakage flux (e.g., flux (530, 540)) in each of the cores (310, 360). lk Since the leakage inductance L can be increased independently of the change in the number of turns based on the shape of the cores (310, 360), lk The number of turns required to secure it can be reduced. Leakage inductance L lk As the number of turns of each of the inductors (340, 350) required to secure the volume and weight of the inductor assembly (210) including the inductors (340, 350) and the power circuit including the inductor assembly (210) may be reduced.

[0094] A portion for forming a leakage magnetic flux in the core (310) may include, for example, a portion of the extension (316) between region (316-3) and the first stage (316-1) and / or a portion of the extension (316) between region (316-4) and the second stage (316-2). A portion for forming a leakage magnetic flux in the core (360) may include, for example, a portion of the extension (366) between region (366-3) and the first stage (366-1) and / or a portion of the extension (366) between region (366-4) and the second stage (366-2).

[0095] In one embodiment where inductively coupled inductors (340, 350) form a differential mode coupled inductor, the magnetizing inductance L of the differential mode coupled inductor m The inductance L of the inductors (340, 350) in a state where a short circuit is formed between the terminals (210-3, 210-4) of the inductor assembly (210). b Based on this, it can be measured as in mathematical formula 2.

[0096]

[0097] Magnetizing inductance L in Equation 2 m ...can be related to the size of the air gaps (370, 380). For example, as the size of the air gaps (370, 380) increases, the magnetization inductance L m This can be reduced. As the size of the gaps (370, 380) increases, winding loss due to the fringing effect may occur.

[0098] In one embodiment where inductively coupled inductors (340, 350) form a differential mode coupled inductor, based on the proportional relationship between leakage inductance and magnetization inductance, the coupling coefficient k of the differential mode coupled inductor can be expressed as Equation 3.

[0099]

[0100] The air gaps (370, 380) formed within the tube portions of each of the bobbins (320, 330) may be related to at least one of magnetizing inductance or leakage inductance generated by the interaction of magnetic fluxes (510, 520, 530, 540) generated in each of the inductors (340, 350). For example, based on the volume of the air gaps (370, 380), the magnetizing inductance L of Equation 2 m This may change. Magnetizing inductance L m As this changes, the coupling coefficient k of Equation 3 may change.

[0101] The magnetic saturation of the inductors (340, 350) included in the inductor assembly (210) is, in one embodiment where the inductively coupled inductors (340, 350) form a differential mode coupled inductor, the magnetizing inductance L m It may be related to the current of the magnetizing inductor of the differential mode coupled inductor corresponding to. For example, as the maximum value of the current of the magnetizing inductor decreases, an inductor having a reduced saturation current may be selected as the inductors (340, 350). As an inductor having a reduced saturation current is selected as the inductors (340, 350), the volume of the inductor assembly (210) containing the inductors (340, 350) may be reduced.

[0102] FIG. 5b is an exemplary drawing for explaining the magnetic flux induced in the inductor assembly (215) of FIG. 4a through 4c. Any description that overlaps with or is similar to FIG. 5a is omitted for convenience. Magnetic fluxes (515, 525, 535, 545) induced in each of the inductors (340, 350) are illustrated when the inductor assembly (210) receives an alternating current signal rectified through the terminals (210-1, 210-2). In one embodiment where the inductors (340, 350) form a differential mode coupled inductor, the magnetic fluxes (515, 525) may radiate in opposite directions within the cores (410, 420). The magnetic fluxes (535, 545) may correspond to leakage magnetic fluxes that do not intersect each other within the cores (410, 420).

[0103] As described above, in order to form magnetic fluxes (535, 545) corresponding to leakage magnetic flux, the cores (410, 420) of the inductor assembly (215) may include a portion independent of the intersecting magnetic fluxes (515, 525). For example, the extension (416) of the core (410) may include a portion extending from region (416-3) to a first stage (416-1), and / or a portion extending from region (416-4) to a second stage (416-2). For example, the core (420) may include an extension (425) extending to a different region, excluding the region connecting the protrusions (412, 414) around which the inductors (340, 350) are wound.

[0104] Hereinafter, with reference to FIG. 6, in an embodiment in which inductors (340, 350) included in an inductor assembly (e.g., inductor assembly (210) of FIG. 5a and / or inductor assembly (215) of FIG. 5b) form a differential mode coupled inductor, the operation of the differential mode coupled inductor is described based on the power circuit of a display device including the inductor assembly.

[0106] FIG. 6 is a circuit diagram of a power circuit (110) included in a display device according to one embodiment. The display device of FIG. 6 may include the display device (101) of FIG. 1. The power circuit (110) of FIG. 6 may correspond to the power circuit (110) of FIG. 1 to FIG. 2. For example, the power source (120) and rectifier circuit (112) of FIG. 6 may correspond to the power source (120) and rectifier circuit (112) of FIG. 1 to FIG. 2, respectively. For example, each of the inductor assembly (210), switching circuit (220), node (240), capacitor (250), node (260), capacitor (270), resistor (280), and ground node (290) of FIG. 6 may correspond to the inductor assembly (210), switching circuit (220), node (240), capacitor (250), node (260), capacitor (270), resistor (280), and ground node (290) of FIG. 2.

[0107] Referring to FIG. 6, an embodiment is shown in which the rectifier circuit (112) is a full-wave rectifier circuit based on a bridge diode. In this case, the rectifier circuit (112) can output an AC signal having a voltage corresponding to the absolute value of the voltage of the AC signal of the power source (120). Referring to FIG. 6, in an embodiment in which inductors included in an inductor assembly (210) (e.g., inductors (340, 350) of FIG. 3a to 3c, FIG. 4a to 4c and FIG. 5a to 5b) form a differential mode coupled inductor, an equivalent circuit of the inductors is shown. The ends (210-1, 210-3) of the inductor assembly (210) may correspond to both ends of the first inductor (e.g., the inductor (340) of FIGS. 3a to 3c, FIGS. 4a to 4c and FIGS. 5a to 5b) among the inductors included in the inductor assembly (210). The ends (210-2, 210-4) of the inductor assembly (210) may correspond to both ends of the second inductor (e.g., the inductor (350) of FIGS. 3a to 3c, FIGS. 4a to 4c and FIGS. 5a to 5b) among the inductors included in the inductor assembly (210).

[0108] Referring to FIG. 6, the equivalent circuit of the inductors included in the inductor assembly (210) has a leakage inductance L lk1 and L lk2 Two leakage inductors having and magnetization inductance L m It can be expressed based on a magnetizing inductor having. The leakage inductance L of Equation 1 lk Regarding, the leakage inductance L of the two leakage inductors mentioned above lk1 and L lk2 Each is L lk =L lk1 =L lk2 It can have the relationship. In this case, the currents i output from the terminals (210-3, 210-4) Llk1 , i Lik2 Each of these can be determined by the two leakage inductors and the magnetization inductor.

[0109] Referring to FIG. 6, the switching circuit (220) may include a node (610) corresponding to a terminal (220-1) connected to a terminal (210-3) of the inductor assembly (210), a diode (620) connected to the node (610), and a switch (630). The switch (630) may include a transistor. Although an N-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is shown as an example of a transistor, a P-channel MOSFET and / or a BJT (bipolar junction transistor) may be included in the switch (630). At the node (610), the drain of the transistor included in the switch (630) and the anode of the diode (620) may be connected. The cathode of the diode (620) is connected to terminal (220-5) of the switching circuit (220) to cause a flow of current from node (610) to node (260) based on the potential difference between the anode and cathode of the diode (620). The source of the transistor included in the switch (630) is connected to the ground node (290) to cause a flow of current between node (610) and the ground node (290) based on the voltage applied to the gate of the transistor. Referring to FIG. 6, the gate of the transistor included in the switch (630) can be connected to terminal (220-3). If the switching circuit (220) of FIG. 6 corresponds to the switching circuit (220) of FIG. 2, terminal (220-3) can be connected to terminal (230-1) of the control circuit (230) of FIG. 2.

[0110] Referring to FIG. 6, the switching circuit (220) may include a node (615) corresponding to a terminal (220-2) connected to a terminal (210-4) of the inductor assembly (210), and a diode (625) and a switch (635) connected to the node (615). The switch (635) may include a transistor (e.g., an N-channel MOSFET). At the node (615), the drain of the transistor included in the switch (635) and the anode of the diode (625) may be connected. The cathode of the diode (625) is connected to a terminal (220-6) of the switching circuit (220) to cause a flow of current from the node (625) to the node (260) based on the potential difference between the anode and the cathode of the diode (625). The source of the transistor included in the switch (635) is connected to the ground node (290), and based on the voltage applied to the gate of the transistor, it can cause a flow of current between the node (615) and the ground node (290). Referring to FIG. 6, the gate of the transistor included in the switch (630) can be connected to terminal (220-4). If the switching circuit (220) of FIG. 6 corresponds to the switching circuit (220) of FIG. 2, terminal (220-4) can be connected to terminal (230-2) of the control circuit (230) of FIG. 2.

[0111] As described above, the switching circuit (220) of a display device according to one embodiment has currents (i) flowing from an inductor assembly (210) based on a differential mode coupled inductor to nodes (610, 615). Llk1 , i Lik2 ) can be selectively transmitted to either the ground node (290) or the node (260). Below, a first operation is described in which the flow of current between the node (610), the node (260), and the ground node (290) is controlled based on the switch (630).

[0112] Referring to FIG. 6, in a first state in which a voltage exceeding the threshold voltage of the transistor is applied to the terminal (220-3) connected to the gate of the transistor included in the switch (630), a current flow occurs between the drain and source of the transistor, and a current (i) input to the node (610) Lik1 ) can flow to the ground node (290). Current (i) input to the node (610) Lik1 While the current flows to the ground node (290), the voltage at node (610) is kept lower than the voltage at node (260) based on the potential difference between the drain and source of the transistor of the switch (630), so that the flow of current between node (610) and node (260) can be blocked by the diode (620). If the switch (630) is an ideal switch, the voltage at node (610) can match the voltage at the ground node (290). In the first state, the potential difference between the terminals (210-1, 220-1) of the inductor assembly (210) can be substantially the same as the potential difference between node (240) and the ground node (290). In this case, the current (i) input to node (610) Lik1 The size of ) can be gradually increased based on the inductors of the inductor assembly (210) which are gradually charged based on the potential difference between the stages (210-1, 220-1). For example, the first state may correspond to a build-up period for storing electrical energy within the inductor assembly (210) for charging the capacitor (270).

[0113] Referring to FIG. 6, in a second state where a voltage below the voltage threshold of the transistor is applied to the terminal (220-3) connected to the gate of the transistor included in the switch (630), the flow of current between the drain and source of the transistor may be blocked. In this case, the current (i) input from the terminal (220-1) of the inductor assembly (210) to the node (610) Lik1) can pass through the diode (620) and flow to the node (260). Referring to FIG. 6, since the node (260) is connected to one end of the capacitor (270), the current (i) flowing to the node (260) through the diode (620) in the second state Lik1 ) can be used to charge the capacitor (270). The current (i) flowing through the node (260) Lik1 As ) is used to charge the capacitor (270), the current (i) input to the node (610) Lik1 The size of ) can be gradually reduced. For example, the second state may correspond to a period for powering the capacitor (270) with electrical energy stored in the inductor assembly (210).

[0114] The transition between the first state and the second state may be generated by a control circuit (e.g., control circuit (230) of FIG. 2) that provides voltage to the terminal (220-3). A control circuit connected to the switching circuit (220) according to one embodiment may operate based on a critical-conduction mode (CRM), which is a mode that maintains the first state for a specified time interval. For example, the control circuit may further include a circuit that generates a changing voltage to measure the specified time interval, such as a ramp function and / or a sawtooth function. During the specified time interval, the control circuit may apply a first voltage to the terminal (220-3) that exceeds the voltage threshold of the transistor of the switch (630). In response to identifying the completion of the specified time interval, the control circuit may apply a second voltage to the terminal (220-3) that is less than the first voltage. By applying the second voltage, a transition from the first state to the second state may occur at the switch (630). Current (i Lik1When the magnitude of ) gradually decreases from the second state to 0, the control circuit may reapply the first voltage, which is distinct from the second voltage, to the terminal (220-3). As the first voltage is reapplied, a transition from the second state to the first state may occur at the switch (630).

[0115] Referring to FIG. 6, a second operation in which the flow of current between node (615), node (260), and ground node (290) based on switch (635) is regulated can be performed similarly to the first operation based on the similarity of the connection relationship between diode (620) and switch (630) at node (610) and the connection relationship between diode (625) and switch (635) at node (615). For example, in a state where the transition between the first state and the second state at switch (630) occurs based on the first phase, the control circuit can control the switch (635) based on a second phase delayed by 180° from the first phase. In this case, the transition between the first state and the second state at switch (635) can occur based on the second phase.

[0116] The switching circuit (220) controls the currents (i) flowing from the inductor assembly (210) to each of the nodes (610, 615) based on a control signal provided to the terminals (220-3, 220-4) (e.g., a control signal provided from the control circuit (230) of FIG. 2). Llk1 , i Lik2 Each of the following can make the timings at which it is transmitted to the node (260) different. For example, if a power factor conversion circuit (e.g., power factor conversion circuit (114) of FIG. 2) including an inductor assembly (210) and a switching circuit (220) operates based on an interleaved boost method, the currents (i Llk1 , i Lik2The difference between the times when each is transmitted to the node (260) may correspond to a specified phase difference (e.g., a phase difference of 180°). In the above example, the power factor conversion circuit may correspond to an interleaved boost power factor conversion circuit based on a differential mode coupled inductor. The operation of the interleaved boost power factor conversion circuit according to the voltage of the AC signal applied to the power source (120) will be described later based on the graphs of FIGS. 7 and 8.

[0117] In FIG. 6, an example of a boost power factor conversion circuit capable of providing a voltage exceeding the voltage of the power source (120) according to the duty cycle of the switches (630, 640) is shown, but the embodiment is not limited thereto. For example, a buck power factor conversion circuit capable of providing a voltage less than the voltage of the power source (120) may include an inductor assembly (210).

[0118] As described above, the power circuit (110) of a display device according to one embodiment provides a power signal output from terminals (220-1, 220-2) of an inductor assembly (210) to a capacitor (270) based on an interleaved method, thereby reducing the maximum value of the instantaneous current flowing through each of the inductors included in the inductor assembly (210). As the inductor assembly (210) according to one embodiment forms a differential mode coupled inductor based on the cores (310, 360, 410, 420) of FIGS. 3a to 3c and FIGS. 4a to 4c, the maximum value of the instantaneous current flowing through each of the inductors included in the inductor assembly (210) can be further reduced. In this case, as an inductor having a relatively low saturation current is included in the inductor assembly (210), the volume of the inductor assembly (210) can be reduced. In this case, based on the differential mode coupled inductor, the ripple of the current input to the inductor assembly (210) can be reduced. The reduction of the ripple can cause a reduction in the volume of the line filter included in the power circuit (110) that reduces the ripple. For example, the volume of the power circuit (110) including both the inductor assembly (210) and the line filter can be reduced.

[0119] Hereinafter, with reference to FIGS. 7 and 8, examples of operation at different voltages of a power factor conversion circuit of a display device according to one embodiment will be described.

[0121] FIG. 7 is an exemplary graph for explaining the operation of a power factor conversion circuit included in a display device according to one embodiment. The display device of FIG. 7 may include the display device (101) of FIG. 1. The power factor conversion circuit of FIG. 7 may correspond to the power factor conversion circuit of FIG. 6. Hereinafter, voltages and currents measured at each node of the power factor conversion circuit of FIG. 6 are described while the display device receives an AC signal of 90 Vac. Referring to FIG. 7, voltages and currents measured at each node of the power factor conversion circuit of FIG. 6 are plotted along the same time axis while the display device receives an AC signal of 90 Vac.

[0122] Referring to FIG. 7, graph (710) may represent the voltage of a control signal for controlling the switch (630) of FIG. 6. Graph (720) may represent the voltage of a control signal for controlling the switch (635) of FIG. 6. Graph (730) represents the current (i) output from the terminal (210-3) of FIG. 6. Lik1 ) can be represented. The graph (740) shows the current (i) output from the terminal (210-4) of FIG. 6. Lik2 ) can be represented. The graph (750) is contained within the inductor assembly (210) of FIG. 6 and the magnetization inductance L m Current flowing through a magnetizing inductor having (i Lm It can represent ). Referring to the graphs (710, 720), the voltage of the control signal for controlling the switches (630, 635) can have a duty cycle of 0.5 or more.

[0123] Referring to the graphs (730, 740) of FIG. 7, in one embodiment where the power factor conversion circuit operates based on an interleaved method, the current (i) indicated by the graph (730) Lik1 Within a single cycle (780) of ), the current (i) indicated by the graph (740) Lik2) may have a delay (785) corresponding to half of the single period (780) (i.e., a phase difference of 180°) while having the same period as the single period (780). Similarly, the control signal applied to each of the switches (630, 635) indicated by each of the graphs (710, 720) may also have the same period and change based on a specified phase difference.

[0124] In one embodiment where the inductors included in the inductor assembly (210) of FIG. 6 form a differential mode coupled inductor, the current (i) flowing through the magnetizing inductor Lm ) are the currents flowing through each of the leakage inductors included in the inductor assembly (210) (i.e., i Lik1 and i Lik2 It can be determined based on the difference of )(i Lm =i Llk1 -i Llk2 Referring to the graph (750) in Fig. 7, the current (i) flowing through the magnetizing inductor Lm The absolute value of ) can be maximized in time intervals (760, 770). Referring to the graphs (710, 720) of FIG. 7 within the time intervals (760, 770), the time intervals (760, 770) may correspond to time intervals in which the switches (630, 635) are simultaneously activated. Referring to FIG. 6, within the time intervals (760, 770), as all switches (630, 635) are activated, all switches (630, 635) cause currents (i) flowing through each of the leakage inductors to the ground node (290). Lik1 and i Lik2 ) can be transmitted. For example, the time intervals (760, 770) may be time intervals in which all of the switches (630, 635) of FIG. 6 are controlled based on the first state.

[0125] As described above, as the inductors included in the power factor conversion circuit according to one embodiment form a differential mode coupled inductor, the magnetic saturation of the inductors is the current (i) flowing in the magnetizing inductor Lm It can be determined based on ). As shown in the graph (750) of FIG. 7, the current (i) flowing through the magnetizing inductor Lm The absolute value of ) is the currents flowing through each of the leakage inductors (i.e., i Lik1 and i Lik2 The difference of ) (i Lm =i Llk1 -i Llk2 Since it is limited by ), inductors with relatively low saturation current can be used in the implementation of power factor conversion circuits. Since the saturation current of the magnetizing inductor determines the volume of the differential mode coupled inductor, the volume of the differential mode coupled inductor can be reduced as the maximum value of the current flowing through the magnetizing inductor is limited. As the volume of the differential mode coupled inductor is reduced, the volume of the inductor assembly in which the differential mode coupled inductor is formed and the volume of the power circuit including the inductor assembly can be reduced.

[0127] FIG. 8 is an exemplary graph for explaining the operation of a power factor conversion circuit included in a display device according to one embodiment. The display device of FIG. 8 may include the display device (101) of FIG. 1. The power factor conversion circuit of FIG. 8 may include the power factor conversion circuit (114) of FIG. 1 and FIG. 2 and / or the power factor conversion circuit of FIG. 6. Hereinafter, voltages and currents measured at each node of the power factor conversion circuit of FIG. 6 are described while the display device receives an AC signal of 264 Vac. Referring to FIG. 9, voltages and currents measured at each node of the power factor conversion circuit of FIG. 6 are plotted along the same time axis while the display device receives an AC signal of 264 Vac.

[0128] Referring to FIG. 8, graph (810) may represent the voltage of a control signal for controlling the switch (630) of FIG. 6. Graph (820) may represent the voltage of a control signal for controlling the switch (635) of FIG. 6. Graph (830) represents the current (i) output from the terminal (210-3) of FIG. 6. Lik1 ) can be represented. The graph (840) shows the current (i) output from the terminal (210-4) of FIG. 6. Lik2 ) can be represented. The graph (850) is contained within the inductor assembly (210) of FIG. 6 and the magnetizing inductance L m Current flowing through a magnetizing inductor having (i Lm ...can be represented. Referring to the graphs (810, 820), the voltage of the control signal for controlling the switches (630, 635) may have a duty cycle of less than 0.5. Similar to what is described above in FIG. 7, in one embodiment where the power factor conversion circuit operates based on an interleaved method, the current (i) indicated by the graph (840) Lik2 ) is the current (i) indicated by the graph (830). Lik1 It can have a delay (885) corresponding to a phase difference of 180° while having the same period as a single period (880) of ).

[0129] In one embodiment where the inductors included in the inductor assembly (210) of FIG. 6 form a differential mode coupled inductor, similar to what was described above in FIG. 7, the current (i) flowing through the magnetizing inductor as shown in the graph (850) of FIG. 8 Lm The absolute value of ) is the currents flowing through each of the leakage inductors (i.e., i Lik1 and i Lik2 The difference of ) (i Lm =i Llk1 -i Llk2 It can be limited by ). For example, the current flowing through a magnetizing inductor (i LmThe absolute value of ) can be maximized in time intervals (860, 870). Referring to the graphs (810, 820) of FIG. 8 within time intervals (860, 870), time intervals (860, 870) may correspond to time intervals in which the switches (630, 635) are simultaneously deactivated. Referring to FIG. 6, within the time intervals (860, 870), as all switches (630, 635) are deactivated, all switches (630, 635) cause currents (i) flowing through each of the leakage inductors to a node (260) connected to one end of the capacitor (270). Lik1 and i Lik2 ) can be transmitted. For example, the time intervals (860, 870) may be time intervals in which all of the switches (630, 635) of FIG. 6 are controlled based on the second state.

[0130] As described above, even when receiving an AC signal of a voltage different from that of FIG. 7, the maximum value of the current flowing through the magnetizing inductor can be limited by the difference between the currents flowing through each of the leakage inductors. As the maximum value of the current flowing through the magnetizing inductor is limited, the volume of the differential mode coupled inductor and the power circuit including the differential mode coupled inductor can be reduced.

[0132] FIG. 9 is an exemplary graph for explaining the operation of a power factor conversion circuit included in a display device according to one embodiment. The display device of FIG. 9 may include the display device (101) of FIG. 1. The power factor conversion circuit of FIG. 9 may include the power factor conversion circuit (114) of FIG. 1 and FIG. 2 and / or the power factor conversion circuit of FIG. 6. Hereinafter, voltages and currents measured at each node of the power factor conversion circuit of FIG. 6 within any one cycle of the AC signal while the display device is receiving an AC signal are described.

[0133] Referring to FIG. 9, graph (910) may represent the voltage (e.g., voltage of a rectified AC signal) at node (260) when the node (260) connected to the terminals (220-5, 220-6) of FIG. 6 is open (e.g., capacitor (270) and resistor (280) are electrically disconnected from node (260). Graph (920) represents the current (i) flowing through the inductor assembly (210) of the power factor conversion circuit through node (240) of FIG. 6. in = i Lik1 + i Lik2 ) can be represented. The graph (930) shows the current (i) output from the terminal (210-3) of FIG. 6. Lik1 ) can be represented. The graph (940) shows the current (i) output from the terminal (210-4) of FIG. 6. Lik2 ) can be represented. The graph (950) is contained within the inductor assembly (210) of FIG. 6 and the magnetization inductance L m Current flowing through a magnetizing inductor having (i Lm ) can be represented. The graph (960) represents the voltage applied to the node (240) by the rectifier circuit (112) of FIG. 6 receiving the alternating current signal, and can represent the voltage of the node (240) when the node (240) is open (e.g., when the capacitor (250) and the inductor assembly (210) are separated from the node (240).

[0134] Referring to the graphs (920, 960) of FIG. 9, the current (i) indicated by graph (920) in The phase of the envelope of ) can match the phase of the voltage of the rectified AC signal represented by the graph (960). For example, the currents (i) represented by the graphs (930, 940). Lik1 , i Lik2 Current (i) indicated by ) and graph (950) LmThe phase of the envelope of the ) can match the phase of the voltage of the rectified AC signal represented by the graph (960). As the power factor conversion circuit of the display device according to one embodiment synchronizes the phases of the voltage and current of the AC signal to adjust the power factor of the display device, the phase of the voltage and the phase of the current of the AC signal input to the display device can substantially match.

[0135] Referring to the graphs (930, 940) of FIG. 9, as the power factor conversion circuit according to one embodiment operates based on an interleaved method, the currents (i Lik1 , i Lik2 A phase difference may occur between them. The phase difference may correspond, for example, to the delay (785) in FIG. 7 and / or the delay (885) in FIG. 8. For example, the graphs in FIG. 7 and FIG. 8 may correspond to a portion of a single cycle of the AC signal in FIG. 9.

[0136] In an embodiment where the inductors included in the power factor conversion circuit are differential mode coupled inductors, as shown in the graph (920) of FIG. 9, the current (i) input to the power factor conversion circuit in) may include ripple (925) reduced by the magnetizing inductance and leakage inductance of the differential mode coupled inductor. An increase in leakage inductance by a core shape that increases leakage inductance (e.g., cores (310, 360) of FIG. 3a to 3c and / or cores (410, 420) of FIG. 4a to 4c) (or, based on Equation 3, a decrease in the coupling coefficient due to an increase in leakage inductance) may cause a reduction in ripple (925). As described above, reducing ripple (925) can be achieved based on an increase in leakage inductance and a decrease in the coupling coefficient. Referring to Equation 3, a decrease in the coupling coefficient may mean a decrease in magnetizing inductance. As an inductor assembly according to one embodiment includes a core with a shape that increases leakage inductance, ripple (925) can be reduced without changing the size of the air gap (e.g., the air gaps (370, 380) of FIG. 5a and 5b) or changing the number of turns of the inductor to change the magnetization inductance. As the ripple (925) is reduced, the volume of other circuits (e.g., line filters) for reducing ripple (925) can be reduced.

[0138] As described above, a display device according to one embodiment can improve the power factor based on inductors operating based on a differential mode coupled inductor. The inductors may be disposed on one or more cores having a shape for forming a leakage inductance of the differential mode coupled inductor. For example, the formation of a leakage inductance may cause the inductors to have a relatively low saturation current. For example, the formation of a leakage inductance may reduce the ripple contained in the current received by the inductors.

[0140] A display device according to one embodiment as described above comprises: a first inductor having an end for receiving a rectified alternate current signal; a second inductor having an end for receiving the rectified alternate current signal; an inductor sub-assembly comprising a core wound with a first portion of the first inductor and a first portion of the second inductor; and a power-factor correction circuit comprising a switching circuit that switches the current induced in the first inductor and the second inductor of the inductor assembly by the rectified alternate current signal based on the voltage of the rectified alternate current signal, wherein the core of the inductor assembly comprises an extending portion extending from a first end to a second end in a first direction, and a first region of the extending portion spaced apart from the first end and the second end in the first direction and It may include a first protruding portion that protrudes in a vertical second direction and is wound with a first portion of the first inductor, and a second protruding portion that protrudes in the second direction from a second region of the extension spaced apart from the first region, the first stage, and the second stage and is wound with a first portion of the second inductor.

[0141] In a display device according to one embodiment, the inductor assembly further comprises another core on which the second portion of the first inductor and the second portion of the second inductor are wound, and the other core may include, within the inductor assembly, another extending portion extending from a first end to a second end in the first direction, a first protruding portion protruding from a first region of the other extending portion spaced apart from the first end of the other extending portion and the second end of the other extending portion and on which the second portion of the first inductor is wound, and a second protruding portion protruding from a second region spaced apart from the first region of the other extending portion, the first end of the other extending portion and the second end of the other extending portion and on which the second portion of the second inductor is wound.

[0142] In a display device according to one embodiment, one end of a first protrusion of the other core is separated from one end of a first protrusion of the core, and one end of a second protrusion of the other core may be separated from one end of a second protrusion of the core.

[0143] In a display device according to one embodiment, the inductor assembly may further include a first bobbin comprising a tube portion into which a first protrusion of the core and a first protrusion of the other core are inserted, and a first portion of the first inductor and a second portion of the first inductor are wound.

[0144] In a display device according to one embodiment, the inductor assembly further comprises a second bobbin having a tube portion into which a second protrusion of the core and a second protrusion of the other core are inserted, and a first portion of the second inductor and a second portion of the second inductor are wound, and the length of the tube portion of the second bobbin may correspond to the length of the tube portion of the first bobbin.

[0145] In a display device according to one embodiment, the length of the tube portion of the first bobbin may exceed the sum of the length of the first protrusion of the core and the length of the first protrusion of the other core, such that the space between one end of the first protrusion of the core inserted into the tube portion and one end of the first protrusion of the other core inserted into the tube portion is formed to adjust at least one of the magnetizing inductance or leakage inductance based on the interaction of magnetic flux generated in each of the first inductor and the second inductor.

[0146] In a display device according to one embodiment, the first inductor of the inductor assembly receives the rectified alternating current signal through one end of the first inductor, and is induced toward the first end of the member adjacent to the first protrusion of the core among the first end of the member and the second end of the member, and can output a current according to a magnetic flux based on an air gap formed in the tube portion of the first bobbin to the other end distinguished from the first end of the first inductor.

[0147] In a display device according to one embodiment, the inductor assembly may further include another core that extends along the first direction from a third end corresponding to a first end of the core to a fourth end corresponding to a second end of the core, and is spaced apart from one end of the first protrusion and one end of the second protrusion.

[0148] In a display device according to one embodiment, each of the first inductor and the second inductor may be wound on each of the first protrusion of the core and the second protrusion of the core, such that the first direction of the magnetic flux induced by the first inductor receiving the rectified alternating current signal is distinguished from the second direction of the magnetic flux induced by the second inductor receiving the rectified alternating current signal, within the second protrusion of the core where the first portion of the second inductor is wound.

[0149] A display device according to one embodiment further includes a capacitor charged by the power factor conversion circuit, and the switching circuit may include a first switch connected to the other end of the first inductor to control the current between the capacitor and the first inductor, and a second switch connected to the other end of the second inductor to control the current between the capacitor and the second inductor.

[0150] A display device according to one embodiment further includes a control circuit for controlling each of the first switch and the second switch, and the capacitor receives a current based at least on magnetic flux induced from the first inductor toward the first terminal adjacent to the first protrusion among the first and second terminals of the extension part by the first switch controlled by the control circuit, and receives a current based at least on magnetic flux induced from the second inductor toward the second terminal adjacent to the second protrusion among the first and second terminals of the extension part by the second switch controlled by the control circuit.

[0151] In a display device according to one embodiment, the control circuit controls the first switch based on a specified phase within a period of the rectified alternating current signal, thereby initiating the charging of the capacitor by the first inductor at time intervals based on the phase.

[0152] In a display device according to one embodiment, the control circuit controls the second switch based on another phase having a specified phase difference from the phase of the first signal within the cycle, so as to initiate the charging of the capacitor by the second inductor at different time intervals based on the other phase.

[0153] A display device according to one embodiment comprises a first inductor including one end for receiving a rectified alternating current signal, a second inductor including one end for receiving the rectified alternating current signal, a first core wound with a first portion of the first inductor and a first portion of the second inductor, a second core spaced apart from the first core and arranged to intersect with a portion of the first magnetic flux, a first switching circuit connected to another end distinguished from one end of the first inductor, and a second switching circuit connected to another end distinguished from one end of the second inductor, wherein the first core may include an extension portion that is oriented toward a second direction distinguished from a first direction from the first portion of the first inductor toward the first portion of the second inductor, and another portion distinguished from the portion of the first magnetic flux is formed. In one embodiment, when the rectified alternating current signal is applied to one end of the first inductor and one end of the second inductor, a portion of the first magnetic flux induced by the first inductor may be reduced by a portion of the second magnetic flux induced by the second inductor within a first core in which the first portion of the first inductor is wound.

[0154] In a display device according to one embodiment, the extension portion extends from a first portion to a second portion, and the first core may include a first protrusion in which a first portion of the first inductor is wound, and a second protrusion in which a first portion of the second inductor is wound, protruding parallel to the first protrusion in the first portion and a second portion of the extension portion in which a first portion of the second inductor is wound, and a first portion of the second inductor is wound, in the first portion and a second portion of the extension portion that is spaced apart from the first portion and the second portion.

[0155] In a display device according to one embodiment, the second core may include: another extension extending from a first end to a second end in a direction parallel to the extension of the first core; a first end protruding from a first region of the other extension spaced apart from the first end and the second end of the other extension, and a first end facing and separated from a first end of the first protrusion of the first core; a first protrusion on which the second part of the second inductor is wound; and a second protrusion on which the second part of the second inductor is wound, protruding parallel to the first protrusion of the second core and a second end facing and separated from a first end of the second protrusion of the first core.

[0156] A display device according to one embodiment may further include a first bobbin having a tube portion into which a first protrusion of the first core and a first protrusion of the second core are inserted and a first portion of the first inductor and a second portion of the first inductor are wound, and a second bobbin having a tube portion into which a second protrusion of the first core and a second protrusion of the second core are inserted and a first portion of the second inductor and a second portion of the second inductor are wound.

[0157] In a display device according to one embodiment, the length of the tube portion of the first bobbin may exceed the sum of the length of the first protrusion of the first core and the length of the second protrusion of the second core, such that the space between one end of the first protrusion of the first core inserted into the tube portion and one end of the first protrusion of the second core inserted into the tube portion is formed to adjust at least one of the magnetization inductance or leakage inductance based on the interaction of each of the first magnetic flux and the second magnetic flux.

[0158] In a display device according to one embodiment, the second core extends from a first end to a second end in a direction parallel to the extension of the first core, and may be spaced apart from one end of the first protrusion of the first core and one end of the second protrusion of the first core.

[0159] In a display device according to one embodiment, the display device further comprises a capacitor having one end connected in parallel with the first switching circuit and the second switching circuit, and a control circuit for controlling each of the first switching circuit and the second switching circuit, wherein the capacitor receives a current induced in the first inductor based on a specified phase within the period of the rectified AC signal by the first switching circuit, and receives a current induced in the second inductor based on another phase having a specified phase difference from the specified phase within the period by the second switching circuit.

[0161] The device described above may be implemented as a hardware component, a software component, and / or a combination of a hardware component and a software component. For example, the device and components described in the embodiments may be implemented using one or more general-purpose or special-purpose computers, such as a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA), a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing unit may execute an operating system (OS) and one or more software applications executed on said operating system. Additionally, the processing unit may access, store, manipulate, process, and generate data in response to the execution of the software. For ease of understanding, the processing unit may be described as being used as a single unit, but those skilled in the art will understand that the processing unit may include multiple processing elements and / or multiple types of processing elements. For example, the processing unit may include multiple processors or one processor and one controller. In addition, other processing configurations, such as parallel processors, are also possible.

[0162] Software may include computer programs, code, instructions, or a combination of one or more of these, and may configure a processing unit to operate as desired or instruct the processing unit independently or collectively. Software and / or data may be embodied in any type of machine, component, physical device, computer storage medium, or device so as to be interpreted by the processing unit or to provide instructions or data to the processing unit. Software may be distributed over networked computer systems and may be stored or executed in a distributed manner. Software and data may be stored on one or more computer-readable recording media.

[0163] The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. In this case, the medium may continuously store a program executable by a computer, or temporarily store it for execution or download. Additionally, the medium may be various recording or storage means in the form of a single or several hardware combined, and may not be limited to a medium directly connected to a computer system but may exist distributed over a network. Examples of media may include magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs and DVDs; magneto-optical media such as floptical disks; and media configured to store program instructions, including ROM, RAM, and flash memory. Additionally, other examples of media may include recording or storage media managed by app stores that distribute applications or sites and servers that supply or distribute various other software.

[0164] Although the embodiments have been described above with reference to limited examples and drawings, those skilled in the art can make various modifications and variations from the description above. For example, suitable results can be achieved even if the described techniques are performed in a different order than described, and / or the components of the described system, structure, device, circuit, etc. are combined or assembled in a form different from described, or replaced or substituted by other components or equivalents.

[0165] Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the claims set forth below.

Claims

Claim 1 In a display device, an inductor sub-assembly comprising a first inductor having an end for receiving a rectified alternate current signal, a second inductor having an end for receiving the rectified alternate current signal, and a core wound with a first portion of the first inductor and a first portion of the second inductor; The power-factor correction circuit includes a switching circuit that switches the current induced in the first inductor and the second inductor of the inductor assembly by the rectified AC signal based on the voltage of the rectified AC signal, and the core of the inductor assembly comprises: an extending portion extending from a first end to a second end in a first direction; a first protruding portion protruding in a second direction perpendicular to the first direction from a first region of the extending portion spaced apart from the first end and the second end, and on which a first portion of the first inductor is wound; A display device comprising a second protrusion that protrudes in the second direction from a second region of the extension portion spaced apart from the first region, the first stage, and the second stage, and on which a first portion of the second inductor is wound. In a state of receiving the rectified alternating current signal through the first stage of the first inductor, the magnetic flux induced by the first inductor of the inductor assembly is radiated toward the first stage of the extension portion adjacent to the first protrusion among the first stage of the extension portion and the second stage of the extension portion. Claim 2 A display device according to claim 1, wherein the inductor assembly further comprises another core on which the second portion of the first inductor and the second portion of the second inductor are wound, and the other core comprises: another extending portion extending from a first end to a second end in the first direction within the inductor assembly; a first protruding portion protruding from a first region of the other extending portion spaced apart from the first end of the other extending portion and the second end of the other extending portion, on which the second portion of the first inductor is wound; and a second protruding portion protruding from a second region spaced apart from the first region of the other extending portion, the first end of the other extending portion, and the second end of the other extending portion, on which the second portion of the second inductor is wound. Claim 3 In paragraph 2, one end of the first protrusion of the other core is separated from the end of the first protrusion of the core, and one end of the second protrusion of the other core is separated from the end of the second protrusion of the core. Claim 4 In paragraph 2, the inductor assembly further comprises a first bobbin having a tube portion into which a first protrusion of the core and a first protrusion of the other core are inserted and a first portion of the first inductor and a second portion of the first inductor are wound, and a second bobbin having a tube portion into which a second protrusion of the core and a second protrusion of the other core are inserted and a first portion of the second inductor and a second portion of the second inductor are wound, and the length of the tube portion of the second bobbin corresponds to the length of the tube portion of the first bobbin. Claim 5 A display device according to claim 1, wherein the magnetic flux induced by the second inductor of the inductor assembly in a state of receiving the rectified alternating current signal through the first end of the second inductor is radiated toward the second end of the extension adjacent to the second protrusion among the first end of the extension and the second end of the extension. Claim 6 A display device according to claim 4, wherein the length of the tube portion of the first bobbin exceeds the sum of the length of the first protrusion of the core and the length of the first protrusion of the other core, such that the space between one end of the first protrusion of the core inserted into the tube portion and one end of the first protrusion of the other core inserted into the tube portion is formed to adjust at least one of the magnetizing inductance or leakage inductance based on the interaction of magnetic flux generated in each of the first inductor and the second inductor. Claim 7 A display device according to claim 1, wherein the first inductor of the inductor assembly receives the rectified alternating current signal through one end of the first inductor, is induced toward the first end of the extension adjacent to the first protrusion of the core among the first end of the extension and the second end of the extension, and outputs a current according to a magnetic flux based on an air gap formed within the tube portion of the first protrusion to the other end distinguished from the one end of the first inductor. Claim 8 A display device according to claim 1, wherein the inductor assembly further comprises another core extending along the first direction from a third end corresponding to a first end of the core to a fourth end corresponding to a second end of the core, and spaced apart from one end of the first protrusion and one end of the second protrusion. Claim 9 In a display device, an inductor sub-assembly comprising a first inductor having an end for receiving a rectified alternate current signal, a second inductor having an end for receiving the rectified alternate current signal, and a core wound with a first portion of the first inductor and a first portion of the second inductor; The power-factor correction circuit includes a switching circuit that switches the current induced in the first inductor and the second inductor of the inductor assembly by the rectified AC signal based on the voltage of the rectified AC signal, and the core of the inductor assembly comprises: an extending portion extending from a first end to a second end in a first direction; a first protruding portion protruding in a second direction perpendicular to the first direction from a first region of the extending portion spaced apart from the first end and the second end, and on which a first portion of the first inductor is wound; A display device comprising a first inductor and a second protrusion that protrudes in the second direction from a second region of the extension portion spaced apart from the first region, the first stage and the second stage, and on which a first portion of the second inductor is wound, wherein each of the first inductor and the second inductor is wound on each of the first protrusion of the core and the second protrusion of the core, such that, inside the second protrusion of the core on which the first portion of the second inductor is wound, the first direction of the magnetic flux induced by the first inductor receiving the rectified alternating current signal is distinguished from the second direction of the magnetic flux induced by the second inductor receiving the rectified alternating current signal. Claim 10 The display device according to claim 1 further comprises a capacitor charged by the power factor conversion circuit, and the switching circuit comprises: a first switch connected to the other end of the first inductor to control the current between the capacitor and the first inductor; and a second switch connected to the other end of the second inductor to control the current between the capacitor and the second inductor. Claim 11 delete Claim 12 delete Claim 13 delete Claim 14 delete Claim 15 delete Claim 16 delete Claim 17 delete Claim 18 delete Claim 19 delete Claim 20 delete

Images