Power circuit for protecting, from noise, transistor for limiting inrush current, and electronic device comprising same

Abstract

This electronic device may comprise a display panel, and a power circuit for generating, from an alternating current signal, a power signal to be supplied to the display panel. The power circuit may comprise: a capacitor; a power factor conversion circuit connected to one end of the capacitor so as to control charging of the capacitor on the basis of the power factor of the alternating current signal; a direct current-direct current conversion circuit for generating the power signal on the basis of power charged in the capacitor; and a switching circuit for connecting one end of the capacitor to any one of a resistor or a ground node according to the voltage of the other end of the capacitor.

Description

Power circuit for protecting a transistor for limiting inrush current from noise and electronic device including the same

[0001] The present disclosure relates to a power circuit for protecting a transistor for limiting inrush current from noise and an electronic device including the same.

[0002] An electronic device driven by an alternating current signal may include a capacitor used to generate a direct current signal from the alternating current signal. When the electronic device is turned on, the magnitude of the current transmitted to the capacitor may increase rapidly because the alternating current signal is transmitted to the discharged capacitor (e.g., inrush current). The electronic device may include a negative temperature coefficient (NTC) thermistor and a relay to limit the inrush current. The electronic device may establish an electrical connection so that power is consumed through the NTC thermistor at the time when power begins to be supplied to the electronic device. After a different time has elapsed from the said time, the electronic device may remove the power transmitted to the NTC thermistor through the relay.

[0003] The information described above may be provided as related art for the purpose of aiding understanding of the present disclosure.

[0004] No claim or determination is made as to whether any of the foregoing can be applied as prior art related to the present disclosure.

[0005] An electronic device is described. The electronic device may include a display panel. The electronic device may include a power circuit configured to generate a power signal to be supplied to the display panel from an alternating current signal. The power circuit may include a capacitor. The power circuit may include a power factor conversion circuit connected to one end of the capacitor and configured to control the charging of the capacitor based on the power factor of the alternating current signal. The power circuit may include a DC-DC conversion circuit configured to generate the power signal based on the power charged in the capacitor. The power circuit may include a switching circuit configured to connect the other end of the capacitor to either a resistor or a ground node depending on the voltage at the one end of the capacitor.

[0006] A power circuit is described. The power circuit may include a capacitor. The power circuit may include a power factor conversion circuit connected to one end of the capacitor and configured to control the charging of the capacitor based on the power factor of an AC signal. The power circuit may include a DC-DC conversion circuit configured to generate a power signal based on the power charged in the capacitor. The power circuit may include a switching circuit configured to connect the other end of the capacitor to either a resistor or a ground node, depending on the voltage at the one end of the capacitor.

[0007] FIG. 1 illustrates an electronic device according to one embodiment.

[0008] Figure 2 illustrates circuits included in an exemplary electronic device.

[0009] FIG. 3a illustrates an exemplary structure of a switching circuit configured to connect a capacitor to a resistor or ground node.

[0010] FIG. 3b illustrates an exemplary structure of a switching circuit including a plurality of transistors.

[0011] FIG. 3c illustrates an exemplary structure of a switching circuit for multiple capacitors.

[0012] Figure 4 illustrates graphs showing the relationship between the voltage applied to one end of a capacitor, the voltage applied to the gate electrode of a transistor, and the time during which a power signal is transmitted.

[0013] FIG. 1 illustrates an electronic device according to one embodiment.

[0014] Referring to FIG. 1, the electronic device (100) can be described as an electronic device capable of displaying images. For example, the electronic device (100) may include a TV (television), a monitor, a computer, a smartphone, a tablet, a portable media player, a wearable device, a video wall, a digital photo frame, etc. The electronic device (100) may be referred to as a display device. For convenience of explanation, the following description assumes that the electronic device (100) is implemented as a TV, but the embodiments are not limited thereto.

[0015] The electronic device (100) may be configured to operate by power provided from the power system (110) (e.g., an alternating current (AC) power signal, and / or an alternating current signal). The electronic device (100) may include a plug (120) (or an electric cord) configured to be connected to a power outlet (or outlet, socket, receptacle) located at one end of the power system (110). The plug (120) may be connected to a component of the electronic device (100) (e.g., an AC-DC adapter (or electric adapter)) for power conversion (e.g., power conversion from an alternating current signal to a direct current (DC) signal (or a direct current power signal).

[0016] While the plug (120) is electrically connected to the power system (110), the electronic device (100) can perform a function to output video, sound, or a combination thereof (e.g., multimedia content) based on the power of the power system (110). When the electronic device (100) receives information representing video and / or sound, the electronic device (100) can perform the function using said information. The information representing video and / or sound may be stored in the electronic device (100) or received from an external electronic device (e.g., a set-top box (STB)) (130) connected to the electronic device (100). The electronic device (100) may include an antenna configured to receive said information wirelessly or may be electrically connected to said antenna. An exemplary hardware configuration included in the electronic device (100) for processing said information is described with reference to FIG. 2.

[0017] While receiving power from the power system (110) through the plug (120), the electronic device (100) may be driven according to any one of a normal mode (or active mode, enabled mode) and a standby mode (or inactive mode, disabled mode, hibernate mode, sleep mode). The normal mode may be described as a mode that consumes power exceeding the power consumption of the standby mode (e.g., standby power) to output video. The modes of the electronic device (100) are not limited to the normal mode and the standby mode. For example, the electronic device (100) may include, in addition to the normal mode and standby mode, other modes that consume power less than the power consumption of the normal mode and more than the power consumption of the standby mode (e.g., a display-OFF mode and / or an eco mode that turns off only the display panel (160) to play only sound such as music).

[0018] In the present disclosure, the term “mode” may be used interchangeably with the term “state”. In standby mode, the output of video and sound by the electronic device (100) may be substantially stopped or minimized. In standby mode, the electronic device (100) may output a message (e.g., “Press the power button”) guiding input to switch to normal mode. The message may be output through the display and / or speaker of the electronic device (100). In normal mode, the electronic device (100) may output video (e.g., video different from the message) and / or sound. The electronic device (100) may switch between or toggle between standby mode and normal mode based on user input.

[0019] The electronic device (100) may include hardware for receiving user input for controlling the electronic device (100) (e.g., user input for switching between standby mode and normal mode). For example, the electronic device (100) may include a switch (or button) that is at least partially visible through the housing of the electronic device (100). For example, the electronic device (100) may include a touch sensor (e.g., a pressure-sensitive touch sensor and / or a capacitive touch sensor) for detecting touch input on at least a portion of the housing. User input may include a direct action by the user on the electronic device (100) (e.g., pressing the switch and / or button, or touching one side of the housing). Embodiments are not limited thereto, and user input may be identified by an audio signal representing the user's speech received through a microphone. The embodiments are not limited thereto, and user input may include indirect actions of the user related to the electronic device (100) based on the remote controller (140).

[0020] Referring to FIG. 1, the electronic device (100) may be configured to receive a wireless signal (or optical signal) from a remote controller (140) based on infrared (IR). Embodiments are not limited thereto, but the remote controller (140) may be configured to transmit a wireless signal based on Bluetooth, BLE (Bluetooth low energy), NFC (near-field communication), UWB (ultra-wideband), Wi-Fi (wireless fidelity), Wi-Fi-direct, and / or other wireless short-range communication protocols, and the electronic device (100) may be configured to receive a wireless signal based on the illustrated wireless short-range communication protocols. In both standby mode and normal mode, the electronic device (100) may be configured to receive a wireless signal from the remote controller (140).

[0021] The power consumption of the electronic device (100) may depend on the mode of the electronic device (100) (e.g., normal mode and / or standby mode). For example, in standby mode, since the output of video and sound is interrupted, the circuit of the electronic device (100) configured to output video and sound may be at least partially deactivated. By deactivating the circuit, the power consumption of the electronic device (100) may be reduced.

[0022] The power consumption of the electronic device (100) in standby mode may be referred to as standby power. The standby power of the electronic device (100) may be described as the power consumption of the electronic device (100) in standby mode measured at the power system (110) (or plug (120)). Standby power may include the power consumption of the circuit of the electronic device that is at least partially activated. In normal mode, the power consumption of the electronic device (100) may increase significantly above the standby power because the circuit that was deactivated in standby mode is reactivated.

[0023] FIG. 1 includes an exploded perspective view illustrating electronic components included in an electronic device (100). The electronic device (100) may include a housing (150), a display panel (160), a power circuit (170), and a main circuitry (180). The housing (150) may include a rear cover (or back cover, back cover) of the electronic device (100). The housing (150) may include an object for supporting the electronic device (100) (e.g., support legs and / or VESA (video electronics standards association) mount holes). One side of the electronic device (100) where the housing (150) is visible may be described as the rear side (e.g., rear side) of the electronic device (100).

[0024] The other side of the electronic device (100), opposite to one side of the electronic device (100) where the housing (150) is visible, may be described as the front side (e.g., front side) of the electronic device (100). A display panel (160) may be visible from the front side of the electronic device (100). The display panel (160) may include a liquid crystal display (LCD), a plasma display panel (PDP), and a plurality of LEDs. The LEDs of the display panel (160) may include organic LEDs (OLEDs). In one embodiment, the display panel (160) may include electronic paper. If the display panel (160) has a flat shape, the display panel (160) may be referred to as a flat panel display (FPD). If the display panel (160) has a curved shape, the display panel (160) may be referred to as a curved display. If the display panel (160) has a deformable shape, the display panel (160) may be referred to as a bendable display, a flexible display, and / or a rollable display.

[0025] The main circuit (180) may be configured to execute the functions of the electronic device (100) described above (e.g., a function for outputting video, sound, or a combination thereof, a turn-on function, a turn-off function, a function for adjusting volume, a function for changing channels, and / or a function for controlling the execution of a software application (e.g., an OTT (over the top) application) installed on the electronic device (100). For example, the main circuit (180) may control a display panel (160) using information received from an external electronic device (130) to output an image and / or video that appears according to said information. For example, the main circuit (180) may be configured to control the display panel (160). The power circuit (170) may be configured to provide power to the main circuit (180). The power circuit (170) may be configured to convert an alternating current signal received from the power system (110) into a direct current (DC) signal for driving the main circuit (180). For example, the power circuit (170) may be configured to transmit a direct current signal to the main circuit (180).

[0026] The power consumption of the electronic device (100) may be the sum of the power consumption of the display panel (160), the main circuit (180), and the power circuit (170). In a normal mode, where the display panel (160), the main circuit (180), and the power circuit (170) are all activated, the power consumption of the electronic device (100) may be the sum of the power consumption of the display panel (160), the main circuit (180), and the power circuit (170). In a standby mode, where the display panel (160) is deactivated and the main circuit (180) is at least partially activated (e.g., a light sensor for receiving a signal from the remote controller (140)), the power consumption (e.g., standby power) of the electronic device (100) may be the sum of the power consumption of the main circuit (180) and the power circuit (170).

[0027] In order to reduce the standby power of the electronic device (100), a method to reduce the power consumption of the power circuit (170) in standby mode may be required. For example, when switching from normal mode to standby mode, a part of the main circuit (180) (e.g., a circuit for controlling the display panel (160)) may be designed to be turned off, and the main circuit (180) may be designed to operate at a relatively low voltage in standby mode. In the above example, the power circuit (170) may also be designed to output a DC signal having a voltage lower than that of the DC signal output in normal mode, since the voltage required to operate the main circuit (180) is reduced. In the above example, the voltage deviation of the DC signal output from the power circuit (170) between normal mode and standby mode may be increased.

[0028] According to one embodiment, a power circuit (170) of an electronic device (100) may include a capacitor (e.g., capacitor (C1) of FIG. 3a) and a switching circuit (e.g., switching circuit (240) of FIG. 2). For example, the switching circuit may be configured to establish one of a first electrical connection and a second electrical connection based on the voltage of a power signal transmitted from a power factor conversion circuit (e.g., power factor conversion circuit (235) of FIG. 2). For example, the switching circuit may include a transistor (e.g., transistor (M1) of FIG. 3a). For example, the switching circuit may be configured to establish an electrical connection depending on whether the transistor is activated. For example, the power circuit (170) may be configured to transmit a power signal to a display panel (160) and / or a main circuit (180) based on the electrical connection.

[0029] Below, with reference to FIG. 2, the structure of the electronic device (100) of FIG. 1 is schematically described.

[0030] Figure 2 illustrates circuits included in an exemplary electronic device.

[0031] Referring to FIG. 2, the electronic device (100) may include a power source (210), a power circuit (170), a display panel (160), and a main circuit (180). For example, the power circuit (170) may include an electromagnetic interference (EMI) filter circuit (220), a rectifier circuit (230), a power factor conversion circuit (235), a switching circuit (240), a first DC-DC conversion circuit (250), and a second DC-DC conversion circuit (260).

[0032] A power circuit (170) may be electrically connected to a power source (210) provided from a power distribution system. For example, an electronic device (100) may include a power plug that electrically connects the power source (210) and the power circuit (170). Through the power plug, the power circuit (170) of the electronic device (100) may receive an alternating current signal from the power source (210). The alternating current signal may be described as 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).

[0033] The EMI filter circuit (220) can remove or reduce noise contained in the AC signal of the power source (210). For example, the EMI filter circuit (220) can reduce noise contained in the AC signal based on a line filter.

[0034] The rectifier circuit (230) can receive an AC signal containing noise reduced by the EMI filter circuit (220) from the EMI filter circuit (220). For example, the rectifier circuit (230) can output a rectified AC signal by rectifying the AC signal of the power source (210). The rectifier circuit (230) may include one or more diodes to rectify the AC signal. For example, the rectifier circuit (230) may include a bridge diode circuit for performing full-wave rectification on the AC signal of the power source (210). For example, the power source (210) may perform half-wave rectification on the AC signal. For example, the circuit included in the power circuit (170) is not limited to the bridge diode. For example, the rectifier circuit (230) may include a non-bridge type circuit.

[0035] The power factor conversion circuit (235) can change the power factor of the AC signal rectified by the rectifier circuit (230). Along with changing the power factor of the rectified AC signal, the power factor conversion circuit (235) can provide power to each of the first DC-DC conversion circuit (250) and the second DC-DC conversion circuit (260).

[0036] The first DC-DC conversion circuit (250) can be used to generate power to be supplied to the display panel (160). The second DC-DC conversion circuit (260) can be used to generate power to be supplied to the main circuit (180).

[0037] A display panel (160) can be used to output visualized information to a user. The display panel (160) 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 LEDs may include Organic LEDs (OLEDs). For example, the display panel (160) may include electronic paper.

[0038] The main circuit (180) can generate a signal representing an image to be displayed on the display panel (160) by the display driving circuit. The main circuit (180) can transmit the generated signal to the display driving circuit. The main circuit (180) may be electrically connected to one or more switches for acquiring user input. The one or more switches may be exposed at least partially through the housing of the electronic device (100). For example, the main circuit (180) may include a communication circuit for communicating with an external electronic device for acquiring user input, such as a control device (e.g., a remote controller). For example, the electronic device (100) may use the main circuit (180) to identify user input associated with the one or more switches and / or the control device. The communication circuit may communicate with the external electronic device based on wireless communication protocols such as infrared communication, Bluetooth, and / or Wi-Fi. The main circuit (180) 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 (e.g., generating a signal representing an image to be displayed by a display panel (160)). For example, the main circuit (180) may be in the form of a System-On-Chip (SoC).

[0039] A display driving circuit can control one or more pixels included in a display panel (160) based on a signal received from a main circuit (180). For example, the display panel (160) may include a plurality of pixels arranged in a two-dimensional matrix form. Based on the signal, the display driving circuit can control at least one pixel included in a corresponding row or column among the plurality of pixels. The operation of the display driving circuit controlling at least one pixel may include an operation of changing the luminance, brightness, and / or color of at least one pixel.

[0040] For example, a switching circuit (240) may be used to limit inrush current. For example, a switching circuit (240) may be used to protect the display panel (160) from inrush current. For example, inrush current can be described as a very large current that flows instantaneously when the electronic device (100) is first turned on. For example, inrush current can damage the circuits contained in the electronic device (100). For example, the electronic device (100) may be required to protect the circuits contained in the electronic device (100) from inrush current.

[0041] The electronic device (100) can protect circuits within the electronic device (100) from inrush current using a negative temperature coefficient (NTC) thermistor and a relay. For example, the NTC thermistor can be described as a resistor whose resistance value decreases as the temperature rises. For example, the temperature of the NTC thermistor may rise with the flow of current. For example, the resistance value of the NTC thermistor may decrease as the temperature rises. For example, when the resistance value of the NTC thermistor decreases, it may be difficult for the NTC thermistor to reduce the inrush current. However, it is not limited thereto. For example, because the NTC thermistor has low resistance in high-temperature regions, it may be difficult to reduce the inrush current. For example, the relay can be described as an electromagnetic switch for opening or closing the circuit. For example, when the electrical connection to an NTC thermistor is controlled using a relay, noise (e.g., sound caused by the collision of components) may be generated from the relay because the relay is configured to control the electrical connection based on the physical movement of internal components. For example, to reduce audio noise generated from the relay, the relay may be replaced with a transistor.

[0042] For example, when a power signal is transmitted to the transistor, the power signal may contain noise. For example, 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, the transistor may be broken down by the noise. For example, the noise may cause the transistor to malfunction. For example, the noise may distort the signal. For example, the voltage caused by the noise may be higher than the breakdown voltage of the transistor. For example, the higher the breakdown voltage of the transistor, the higher the price of the transistor may be. For example, the electronic device (100) may be required to use a transistor with a low breakdown voltage.

[0043] For example, the electronic device (100) may be configured as a switching circuit comprising a plurality of transistors connected in series (e.g., transistors (M1) to (MN) of FIG. 3b) to configure the transistor included in the switching circuit (240) as a low voltage withstand transistor. For example, the electronic device (100) may include a capacitor (e.g., capacitor (C2) of FIG. 3a) connected in parallel with the transistor to configure the transistor included in the switching circuit (240) as a low voltage withstand transistor.

[0044] The switching circuit (240) may include a transistor and a resistor. For example, the switching circuit (240) may be configured such that, depending on the voltage at one end of the capacitor (C1), the other end of the capacitor (C1) is connected to one of the transistor and the resistor. For example, the price of a transistor having a first withstand voltage may be lower than the price of a transistor having a second withstand voltage higher than the first withstand voltage. For example, the electronic device (100) may be required to use a transistor having a low withstand voltage to reduce costs. For example, the electronic device (100) may be required to reduce the noise of the voltage applied to the transistor in order to use a transistor having a low withstand voltage (e.g., transistor (M1) of FIG. 3a). For example, the switching circuit (240) may be required to configure another capacitor (e.g., capacitor (C2) of FIG. 3a) to reduce the noise. For example, an exemplary configuration of the switching circuit (240) is described and illustrated in more detail with reference to FIG. 3a.

[0045] FIG. 3a illustrates an exemplary structure of a switching circuit configured to connect a capacitor to a resistor or ground node.

[0046] Referring to FIG. 3a, a signal path may be located between a power factor conversion circuit (235) and a first DC-DC conversion circuit (250). For example, the signal path may include a node (311). For example, the node (311) may be located in the signal path. For example, one end of a resistor (R2) may be connected to the node (311). For example, one end of a capacitor (C1) may be connected to the node (311). For example, one end of a capacitor (C2) may be connected to the node (311).

[0047] For example, the other end of the capacitor (C1) may be connected to the node (321). For example, the capacitor (C1) may include one end connected to the node (311) and the other end connected to the node (321). For example, the capacitor (C1) may be described as an aluminum capacitor. However, the embodiments are not limited thereto.

[0048] The drain electrode of the transistor (M1) can be connected to the node (321). For example, the source electrode of the transistor (M1) can be connected to the ground node (331). For example, the gate electrode of the transistor (M1) can be connected to the node (322). For example, the transistor (M1) may include a drain electrode connected to the node (321), a source electrode connected to the ground node (331), and a gate electrode connected to the node (322). For example, the drain electrode of the transistor (M1) can be connected to one end of the resistor (R1). For example, the source electrode of the transistor (M1) and the other end of the resistor (R1) can each be connected to the ground node (331). For example, the transistor (M1) can be connected in parallel with the resistor (R1) and in series with the capacitor (C1). For example, the capacitor (C1) can be connected in series with the transistor (M1) and resistor (R1) connected in parallel.

[0049] According to one embodiment, the transistor (M1) may be described as an N-channel Metal Oxide Field Effect Transistor (MOSFET). For example, the switching circuit (240) may include an N-channel MOSFET. However, the embodiment is not limited thereto. For example, the switching circuit (240) may be implemented based on a P-channel MOSFET, a Metal Insulator Semiconductor FET (MISFET), and / or a Bi-junction Transistor (BJT).

[0050] For example, one end of the resistor (R1) may be connected to the node (321). For example, the resistor (R1) may include one end connected to the node (321) and the other end connected to the ground node (331). For example, the resistor (R1) may be connected in parallel with the transistor (M1) and in series with the capacitor (C1).

[0051] According to one embodiment, the resistor (R1) may include an NTC thermistor.

[0052] For example, the resistor (R2) may include one end connected to the node (311) and the other end connected to the node (322). For example, the resistor (R3) may include one end connected to the node (322) and the other end connected to the ground node (331). For example, the capacitor (C3) may include one end connected to the node (322) and the other end connected to the ground node (331).

[0053] For example, a plurality of resistors (R2, R3) may be located in the signal path between the node (311) and the ground node (331). For example, a node (322) may be located between the plurality of resistors. For example, the plurality of resistors may be connected in series with each other.

[0054] For example, the capacitor (C2) may include one end connected to the node (311) and the other end connected to the ground node (331).

[0055] For example, the other end of the capacitor (C3) can be connected to the ground node (331). For example, the other end of the resistor (R3) can be connected to the ground node (331). For example, the source electrode of the transistor (M1) can be connected to the ground node (331).

[0056] For example, the capacitor (C1) can be charged by a power signal provided from the power factor conversion circuit (235). For example, when a power signal is transmitted to the electronic device (100), the voltage of the capacitor (C1) can be increased. For example, the capacitor (C1) below a threshold voltage can pass the power signal. For example, if the voltage of the charged capacitor (C1) is lower than the voltage of the power signal, the capacitor (C1) can pass the power signal. For example, the passed power signal can be transmitted to either the transistor (M1) and the resistor (R1). For example, if the voltage of the capacitor (C1) is higher than the voltage of the power signal, the charging of the capacitor (C1) based on the voltage of the power signal can be stopped.

[0057] For example, the transistor (M1) may be activated according to the voltage applied to the gate electrode. The activation of the transistor (M1) may include a state in which an electrical connection is established between the drain electrode and the source electrode of the transistor (M1). For example, the transistor (M1) may be activated when the voltage applied to the gate electrode of the transistor (M1) exceeds a preset voltage (e.g., threshold voltage). For example, the voltage applied to the gate electrode of the transistor (M1) may be determined according to resistors (R2) and (R3). For example, the voltage at one end of the capacitor (C1) may be linked to the voltage applied to the gate electrode of the transistor (M1) by resistors (R2, R3), which are a voltage divider circuit. For example, the voltage applied to the gate electrode of the transistor (M1) may be determined according to the ratio between the resistance value of resistor (R2) and the resistance value of resistor (R3). For example, since resistors (R2) and (R3) are connected in series, the voltage of the power signal output from the power factor conversion circuit (235) can be distributed to each of resistors (R2) and (R3). The voltage of the node (322) between resistors (R2, R3) can be determined by applying the ratio between the resistance values ​​of resistors (R2, R3) to the voltage of the power signal output from the power factor conversion circuit (235). For example, resistors (R2, R3) can be a voltage divider circuit for the voltage of the power signal. For example, the switching circuit (240) can be configured such that the transistor (M1) is deactivated when the capacitor (C1) passes the power signal, and the transistor (M1) is activated when the capacitor (C1) does not pass the power signal.

[0058] For example, the capacitor (C3) can be used to reduce noise in the voltage applied to the gate electrode of the transistor (M1). For example, the capacitor (C3) can be configured to protect the transistor (M1) from noise in the power signal (e.g., noise in the voltage of the node (311).

[0059] Depending on the voltage at one end of the capacitor (C1) connected to the node (311), an electrical connection of the transistor (M1) can be established. For example, if the voltage at one end of the capacitor (C1) is lower than the voltage of the power signal transmitted from the power factor conversion circuit (235), the transistor (M1) is deactivated, and a series connection of the capacitor (C1) and the resistor (R1) can be formed between the node (311) and the ground node (331). For example, when the power signal transmitted from the power factor conversion circuit (235) is applied to the capacitor (C1) which is (completely) discharged, the transistor (M1) can be deactivated. For example, the applied power signal can be transmitted from the capacitor (C1) to the resistor (R1). For example, when the transistor (M1) is deactivated, the power signal received by the resistor (R1) through the capacitor (C1) can be transmitted to the ground node (331). For example, the power signal transmitted to the capacitor (C1) can be limited by the resistor (R1). For example, based on the resistor (R1), the strength of the current transmitted from the power factor conversion circuit (235) may not increase rapidly.

[0060] For example, the transistor (M1) can be coupled with the voltage at one end of the capacitor (C1). For example, when the voltage at one end of the capacitor (C1) is less than the threshold voltage, the power signal transmitted from the power factor conversion circuit (235) can pass through the capacitor (C1) and the resistor (R1) sequentially. For example, when the voltage at one end of the capacitor (C1) is less than the threshold voltage, the current applied to the resistor (R1) may be smaller than when there is no resistor (R1) because the resistor (R1) is in the path through which the power signal transmitted from the power factor conversion circuit (235) passes.

[0061] When the voltage at one end of the capacitor (C1) is higher than the voltage of the power signal transmitted from the power factor conversion circuit (235), the transistor (M1) is activated, and a series connection of the capacitor (C1) and the transistor (M1) can be formed between the node (311) and the ground node (331). When the transistor (M1) is activated, the current of the capacitor (C1) can be transmitted to the ground node (331) through the transistor (M1) instead of being transmitted to the resistor (R1). For example, when the transistor (M1) is activated, the current of the capacitor (C1) can be transmitted to the ground node (331) through the transistor (M1) among the resistor (R1) and the transistor (M1). For example, the switching circuit (240) can be configured so that the current of the capacitor (C1) is transmitted to the ground node (331) through the transistor (M1) among the resistor (R1) and the transistor (M1) based on the activation of the transistor (M1). For example, when the transistor (M1) is activated, the capacitor (C1) can be charged without a power signal being transmitted to the resistor (R1).

[0062] A capacitor (C2) can be used to reduce noise in the power signal transmitted to the transistor (M1). For example, the capacitor (C2) can be used to stabilize the transistor (M1). For example, a switching circuit (240) can be configured to reduce noise in the power signal transmitted to the transistor (M1). For example, because the capacitor (C2) reduces noise in the power signal transmitted to the transistor (M1), the switching circuit (240) may include a transistor having a lower voltage rating. For example, a transistor having a lower voltage rating may be cheaper than a transistor having a higher voltage rating.

[0063] The capacitor (C1) can provide electrical energy to the first DC-DC conversion circuit (250). For example, after the capacitor (C1) is charged by a power signal transmitted from the power factor conversion circuit (235), the electrical energy stored in the capacitor (C1) can be discharged. For example, when the transistor (M1) is activated based on a plurality of resistors (e.g., resistor (R2) and resistor (R3)) on the node (311) and the ground node (331), the transistor (M1) can be activated until the power source (210) is removed.

[0064] When the transistor (M1) is activated, the power consumed by the switching circuit (240) may be less than the power consumed by the switching circuit (240) when the transistor (M1) is deactivated. For example, when the transistor (M1) is deactivated, the power signal transmitted from the power factor conversion circuit (235) may be transmitted to the resistor (R1) through the capacitor (C1). For example, the power signal may be transmitted to the ground node (331) through the resistor (R1). For example, power may be consumed in the resistor (R1) because the power signal passes through the resistor (R1).

[0065] When the transistor (M1) is activated, the power signal transmitted from the power factor conversion circuit (235) can be transmitted to the transistor (M1) through the capacitor (C1). For example, the power signal can be transmitted to the ground node (331) through the activated transistor (M1) among the resistor (R1) and the activated transistor (M1). For example, when the power signal is transmitted to the ground node (331) through the transistor (M1), the power signal does not pass through the resistor (R1), so power consumption in the resistor (R1) can be stopped. For example, based on the removal of power consumed in the resistor (R1), the power consumption (or standby power) of the electronic device (100) including the switching circuit (240) can be reduced.

[0066] For example, the switching circuit (240) may be configured to include a transistor with low voltage withstand capability. For example, the switching circuit (240) may include a plurality of transistors. For example, a plurality of transistors is described and illustrated in more detail with reference to FIG. 3b.

[0067] FIG. 3b illustrates an exemplary structure of a switching circuit including a plurality of transistors.

[0068] Referring to FIG. 3b, the switching circuit (340) may be configured to include a plurality of transistors (M1 to MN) (N is a natural number greater than or equal to 2). For example, the switching circuit (340) may be an example of the switching circuit (240). For example, transistor (M1) may include a drain electrode connected to node (321), a source electrode connected to the drain electrode of transistor (M2), and a gate electrode connected to node (322). For example, transistor (M2) may include a drain electrode connected to the source electrode of transistor (M1), a source electrode connected to the drain electrode of transistor (MN), and a gate electrode connected to node (322). For example, transistor (MN) may include a drain electrode connected to the source electrode of transistor (MN-1), a source electrode connected to ground node (331), and a gate electrode connected to node (322).

[0069] For example, transistors (M1), (M2), and (MN) can be connected in series. For example, since transistors (M1) and (MN) are connected in series, a portion of the voltage of the power signal transmitted from the power factor conversion circuit (235) can be assigned to each of the plurality of transistors (M1, M2, and MN). For example, when each of transistors (M1) and (MN) is activated, a portion of the voltage of the power signal transmitted from the power factor conversion circuit (235) can be assigned to each of transistors (M1) and (MN). For example, when N is 2, half of the voltage of the power signal transmitted from the power factor conversion circuit (235) can be applied to transistor (M1), and the other half of the power signal can be applied to transistor (M2). For example, because the voltage applied to each of the plurality of transistors is reduced, the switching circuit (340) can be composed of a plurality of transistors with a relatively lower voltage rating than when using a single transistor.

[0070] For example, the electronic device (100) may include a switching circuit (e.g., the switching circuit (350) of FIG. 3c) for a plurality of capacitors (e.g., capacitor (C1) and capacitor (C4)) between the power factor conversion circuit (235) and the first DC-DC conversion circuit (250). The switching circuit for the plurality of capacitors is described and illustrated in more detail with reference to FIG. 3c.

[0071] FIG. 3c illustrates an exemplary structure of a switching circuit for multiple capacitors.

[0072] Referring to FIG. 3c, the electronic device (100) may include a power factor conversion circuit (235), a plurality of capacitors (C1, C4), a switching circuit (350), and a first DC-DC conversion circuit (250). For example, the switching circuit (350) may be an example of the switching circuit (240). For example, the switching circuit (350) may include at least one of a plurality of resistors (e.g., resistor (R2) and resistor (R3)), a capacitor (C3), a transistor (M1), a transistor (M2), a capacitor (C1), a resistor (R1), a transistor (M3), a transistor (M4), a capacitor (C4), a resistor (R4), and a capacitor (C2). For example, a signal path may be located between the power factor conversion circuit (235) and the first DC-DC conversion circuit (250). For example, the signal path may include a node (311). For example, a node (311) can be located in the signal path.

[0073] For example, a plurality of resistors (e.g., resistor (R2) and resistor (R3)) may be arranged in series on the signal path between node (311) and ground node (331). For example, resistor (R2) may include one end connected to node (311) and the other end connected to node (322). For example, resistor (R3) may include one end connected to node (322) and the other end connected to ground node (331). For example, capacitor (C3) may include one end connected to node (322) and the other end connected to ground node (331).

[0074] A capacitor (C1) may include one end connected to a node (311) and the other end connected to a node (321). For example, a transistor (M1) may include a drain electrode connected to a node (321), a source electrode connected to the drain electrode of a transistor (M2), and a gate electrode connected to a node (322). For example, a transistor (M2) may include a drain electrode connected to the source electrode of a transistor (M1), a source electrode connected to a ground node (331), and a gate electrode connected to a node (322). For example, a resistor (R1) may include one end connected to a node (321) and the other end connected to a ground node (331).

[0075] The capacitor (C4) may include one end connected to the node (311) and the other end connected to the node (323). For example, the transistor (M3) may include a drain electrode connected to the node (323), a source electrode connected to the drain electrode of the transistor (M4), and a gate electrode connected to the node (322). For example, the transistor (M4) may include a drain electrode connected to the source electrode of the transistor (M3), a source electrode connected to the ground node (331), and a gate electrode connected to the node (322). For example, the resistor (R4) may include one end connected to the node (323) and the other end connected to the ground node (331).

[0076] According to one embodiment, the resistance value of resistor (R4) may be the same as the resistance value of resistor (R1). However, it is not limited thereto. For example, the resistance value of resistor (R4) may be different from the resistance value of resistor (R1).

[0077] The capacitor (C2) may include one end connected to the node (311) and the other end connected to the ground node (331). For example, the capacitor (C2) may be used to remove or reduce noise in a power signal transmitted to transistors (M1), transistor (M2), transistor (M3), and transistor (M4).

[0078] The capacitance of capacitor (C1) may be the same as the capacitance of capacitor (C4). However, it is not limited thereto. For example, the capacitance of capacitor (C1) may be different from the capacitance of capacitor (C4).

[0079] The capacitance of capacitor (C2) may be smaller than the capacitance of capacitor (C1). The capacitance of capacitor (C2) may be smaller than the capacitance of capacitor (C4). For example, capacitor (C2) may be described as a film capacitor. For example, capacitor (C2) may be described as a ceramic capacitor.

[0080] For example, when the switching circuit (350) is configured to establish an electrical connection according to the voltage of each capacitor (C1) and capacitor (C4), the electronic device (100) may be easily miniaturized. For example, using a plurality of capacitors with a second capacitance smaller than the first capacitance (e.g., capacitor (C1) and capacitor (C4) in FIG. 3c) rather than a single capacitor with a first capacitance (e.g., capacitor (C1) in FIG. 3a) may be advantageous for miniaturizing the electronic device (100).

[0081] For example, the switching circuit (350) may be configured to establish an electrical connection according to the voltage at one end of the capacitor (C1) and the voltage at one end of the capacitor (C4). For example, the voltage at one end of the capacitor (C1) may be linked to the voltage applied to the gate electrodes of each of the transistors (M1), transistor (M2), transistor (M3), and transistor (M4). For example, when the electrical energy of the capacitor (C1) is discharged, the switching circuit (350) may be configured to establish an electrical connection with the plurality of transistors (M1, M2) and resistor (R1). For example, when the electrical energy of the capacitor (C4) is discharged, the switching circuit (350) may be configured to establish an electrical connection with the plurality of transistors (M3, M4) and resistor (R4). For example, based on the establishment of an electrical connection between a capacitor (e.g., capacitor (C1) or capacitor (C4)) and a plurality of transistors (e.g., transistor (M1) to transistor (M4)), when the electrical energy of the capacitor is discharged, the electrical energy consumed by the resistor (e.g., resistor (R1) or resistor (R4)) can be reduced or eliminated.

[0082] For example, the transistor (M1) can be activated depending on the voltage of one end of the capacitor (C1). The activation of the transistor (M1) based on the voltage of one end of the capacitor (C1) is described and illustrated in more detail with reference to FIG. 4.

[0083] Figure 4 illustrates graphs showing the relationship between the voltage applied to one end of a capacitor, the voltage applied to the gate electrode of a transistor, and the time during which a power signal is transmitted.

[0084] Referring to FIG. 4, the graph (410) may represent the voltage of the power signal applied to the node (311) and the voltage of the power signal applied to the node (322) over time. For example, the horizontal axis of the graph (410) may represent time. For example, the vertical axis of the graph (410) may represent the voltage of the power signal. For example, the power signal may be transmitted from the power factor conversion circuit (235) based on the alternating current signal received from the power source (210).

[0085] After the capacitor (C1) is (completely) discharged, it can be charged based on a power signal transmitted from the power factor conversion circuit (235). For example, based on the power signal transmitted from the power factor conversion circuit (235), the voltage of the power signal applied to the node (311) can appear in the form of a sinusoidal wave.

[0086] In the time interval (412), since one end of the capacitor (C1) is connected to the node (311), the voltage of one end of the capacitor (C1) can be equal to the voltage of the power signal applied to the node (311). For example, the voltage of one end of the capacitor (C1) can rise in the time interval (412).

[0087] In the time interval (412), since the gate electrode of the transistor (M1) is connected to the node (322), the voltage applied to the gate electrode of the transistor (M1) may be equal to the voltage of the power signal applied to the node (322). For example, the voltage of the gate electrode of the transistor (M1) may increase in the time interval (412). For example, the voltage of the gate electrode of the transistor (M1) may increase in the time interval (412) based on a voltage divider circuit including a plurality of resistors (R2, R3). For example, when the voltage of the gate electrode of the transistor (M1) is below a preset voltage, the transistor (M1) may be deactivated. For example, when the transistor (M1) is deactivated, the electrical energy discharged through the other end of the capacitor (C1) may be transmitted to the ground node (331) through the resistor (R1).

[0088] In the time interval (414), the voltage at one end of the capacitor (C1) can be varied based on the alternating current signal of the power source (210). For example, the voltage at one end of the capacitor (C1) can be coupled with the rectified alternating current signal transmitted from the power factor conversion circuit (235).

[0089] In the time interval (414), the transistor (M1) can be activated. For example, in the time interval (414), when the voltage of the gate electrode of the transistor (M1) exceeds a preset voltage, the transistor (M1) can be activated. For example, when the transistor (M1) is activated, the electrical energy of the capacitor (C1) can be transmitted to the ground node (331) through the transistor (M1) among the transistor (M1) and the resistor (R1).

[0090] In the time interval (414), even if the voltage of the node (311) decreases, the voltage applied to the gate electrode of the transistor (M1) can be maintained. For example, even if the voltage of the node (311) is lower than the peak voltage, the voltage of the gate electrode of the transistor (M1) is maintained, and the transistor (M1) can be activated. For example, when the voltage of the node (311) is lower than the voltage corresponding to the boundary between the time interval (412) and the time interval (414), the gate electrode of the transistor (M1) can transmit a power signal transmitted from the capacitor (C1). For example, when the voltage of the node (311) is lower than the voltage corresponding to the boundary between the time interval (412) and the time interval (414), the gate electrode of the transistor (M1) can exceed a preset voltage due to the electrical energy discharged from the capacitor (C1). For example, due to the electrical energy discharged from the capacitor (C1), the transistor (M1) can maintain an activated state. For example, as the transmission of a power signal from a capacitor (C1) to a resistor (R1) is interrupted depending on the maintenance of the active state of the transistor (M1), the power consumption of the electronic device (100) including the switching circuit (240) may be smaller than the power consumption of another electronic device that does not include the switching circuit (240).

[0091] The technical problems to be solved in this disclosure are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this disclosure pertains.

[0092] An electronic device as described above (e.g., electronic device (100)) may include a display panel (e.g., display panel (160)). The electronic device may include a power circuit (e.g., power circuit (170)) configured to generate a power signal to be supplied from an alternating current signal to the display panel. The power circuit may include a capacitor (e.g., capacitor (C1)), a power factor conversion circuit (e.g., power factor conversion circuit (235)) connected to one end of the capacitor and configured to control the charging of the capacitor based on the power factor of the alternating current signal, a DC-DC conversion circuit (e.g., first DC-DC conversion circuit (250)) configured to generate the power signal based on the power charged in the capacitor, and a switching circuit (e.g., switching circuit (240)) configured to connect the other end of the capacitor to either a resistor (e.g., resistor (R1)) or a ground node (e.g., ground node (331)) depending on the voltage at the one end of the capacitor.

[0093] According to one embodiment, the switching circuit may include a transistor comprising a drain electrode connected to the other end of the capacitor and a source electrode connected to the ground node.

[0094] According to one embodiment, one end of the resistor may be connected to a node between the other end of the capacitor and the drain electrode of the transistor. The other end of the resistor may be connected to another ground node.

[0095] According to one embodiment, the power circuit may include a plurality of resistors (e.g., resistor (R2) and resistor (R3)) connected in series, which are located between a node (e.g., node (311)) on a signal path where a power signal is transmitted and another ground node (e.g., ground node (331)). The gate electrode of the transistor may be connected to another node (e.g., node (322)) between the plurality of resistors.

[0096] According to one embodiment, the transistor may be configured to connect the other end of the capacitor to the resistor when the voltage at the one end of the capacitor is less than the threshold voltage, and to connect the other end of the capacitor to the ground node when the voltage at the one end of the capacitor exceeds the threshold voltage.

[0097] According to one embodiment, the switching circuit may include a first transistor and a second transistor. The first transistor may include a first drain electrode connected to the other end of the capacitor and a first source electrode connected to the second drain electrode of the second transistor. The second transistor may include the second drain electrode and a second source electrode connected to the ground node.

[0098] According to one embodiment, the power circuit may include a plurality of resistors (e.g., resistor (R2) and resistor (R3)) connected in series, located between a node on a signal path where a power signal is transmitted (e.g., node (311)) and the ground node. The first gate electrode of the first transistor and the second gate electrode of the second transistor may be connected to another node between the plurality of resistors.

[0099] According to one embodiment, the power circuit may include another capacitor (e.g., capacitor (C2)) located between a node (e.g., node (311)) on a signal path where a power signal is transmitted and another ground node (e.g., ground node (331)).

[0100] According to one embodiment, the other capacitor may include one end connected to the one end of the capacitor and the other end connected to the other ground node.

[0101] According to one embodiment, the capacitance of the capacitor may be greater than the capacitance of the other capacitor.

[0102] According to one embodiment, the other capacitor may be a film capacitor.

[0103] According to one embodiment, the other capacitor may be a ceramic capacitor.

[0104] According to one embodiment, the power circuit may further include another capacitor (e.g., capacitor (C4)). The other capacitor may include one end connected to a node (e.g., node (311)) on a signal path where a power signal is transmitted, and the other end connected to another node (e.g., node (323)) between another transistor (e.g., transistor (M3)) and another resistor (e.g., resistor (R4)). The switching circuit may be configured to connect the other end of the other capacitor to either the other resistor or another ground node (e.g., ground node (331)) depending on the voltage at one end of the other capacitor.

[0105] According to one embodiment, the other transistor may include a drain electrode connected to the other node and a source electrode connected to the other ground node.

[0106] According to one embodiment, the other transistor may be a third transistor. The switching circuit may include the third transistor (e.g., transistor (M3)) and the fourth transistor (e.g., transistor (M4)). The third transistor may include a drain electrode connected to the other end of the other capacitor (e.g., capacitor (C4)), and a source electrode connected to the other drain electrode of the fourth transistor.

[0107] The fourth transistor may include the other drain electrode and the other source electrode connected to the other ground node (331).

[0108] According to one embodiment, the resistor may be an NTC (negative temperature coefficient) thermistor.

[0109] According to one embodiment, the electronic device may further include an electromagnetic interference (EMI) filter circuit configured to reduce noise of the alternating current signal.

[0110] According to one embodiment, the power circuit may further include a rectifier circuit configured to rectify the alternating current signal.

[0111] According to one embodiment, the electronic device may further include a main circuit configured to control the display panel.

[0112] According to one embodiment, the display panel may further include a plurality of pixels and a display driving circuit configured to control the plurality of pixels based on a signal received from the main circuit.

[0113] A power circuit as described above (e.g., power circuit (170)) may include a capacitor (e.g., capacitor (C1)). The power circuit may include a power factor conversion circuit (e.g., power factor conversion circuit (235)) connected to one end of the capacitor and configured to control the charging of the capacitor based on the power factor of an AC signal. The power circuit may include a DC-DC conversion circuit (e.g., first DC-DC conversion circuit (250)) configured to generate a power signal based on the power charged in the capacitor. The power circuit may include a switching circuit (e.g., switching circuit (240)) configured to connect the other end of the capacitor to either a resistor or a ground node depending on the voltage at the one end of the capacitor.

[0114] The effects obtainable from the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure belongs.

[0115] 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.

[0116] 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.

[0117] 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 computer-executable program, 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 combined hardware, 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.

[0118] 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 may 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.

[0119] Therefore, other implementations, other embodiments, and equivalents to the claims set forth below are also within the scope of the claims. According to one embodiment, the method according to the various embodiments disclosed herein may be provided as a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily created in a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0120] According to various embodiments, each component (e.g., module or program) of the components described above may include a singular or multiple entities, and some of the multiple entities may be separated and placed in other components. According to various embodiments, one or more of the components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Generally or additionally, multiple components (e.g., module or program) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the multiple components in the same or similar manner as those performed by the corresponding component among the multiple components prior to integration. According to various embodiments, operations performed by the module, program, or other components may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

Claims

1. In an electronic device, Display panel; and It includes a power circuit configured to generate a power signal to be supplied to the display panel from an alternating current signal, and The above power circuit is, Capacitor; A power factor conversion circuit connected to one end of the capacitor and configured to control the charging of the capacitor based on the power factor of the AC signal; A DC-DC conversion circuit configured to generate the power signal based on the power charged in the capacitor; and A switching circuit comprising, depending on the voltage at one end of the capacitor, the other end of the capacitor configured to be connected to either a resistor or a ground node. Electronic device.

2. In claim 1, the switching circuit is, A transistor comprising a drain electrode connected to the other end of the capacitor and a source electrode connected to the ground node, Electronic device.

3. In claim 2, one end of the resistor is, Connected to the node between the other end of the capacitor and the drain electrode of the transistor, and The other end of the above resistor is, connected to another ground node, Electronic device.

4. In claim 2, the power supply circuit is, It is located between a node on a signal path where a power signal is transmitted and another ground node, and includes a plurality of resistors connected in series, and The gate electrode of the above transistor is, connected to another node between the above plurality of resistors, Electronic device.

5. In claim 2, the transistor is, When the voltage at one end of the capacitor is less than the threshold voltage, the other end of the capacitor is configured to be connected to the resistor, and Configured to connect the other end of the capacitor to the ground node when the voltage at the first end of the capacitor exceeds the threshold voltage. Electronic device.

6. In claim 1, the switching circuit is, It includes a first transistor and a second transistor, and The first transistor above is, It includes a first drain electrode connected to the other end of the capacitor, and a first source electrode connected to the second drain electrode of the second transistor, The second transistor mentioned above is, A second source electrode connected to the second drain electrode and the ground node, Electronic device.

7. In claim 6, the power supply circuit is, It includes a plurality of resistors connected in series, located between a node on a signal path where a power signal is transmitted and the ground node. The first gate electrode of the first transistor and the second gate electrode of the second transistor are, connected to another node between the above plurality of resistors, Electronic device.

8. In claim 1, the power circuit is, including another capacitor located between a node on the signal path where a power signal is transmitted and another ground node. Electronic device.

9. In claim 8, the other capacitor is, One end connected to the one end of the capacitor, and the other end connected to the other ground node, Electronic device.

10. In claim 8, the capacitance of the capacitor is, Larger than the capacitance of the other capacitor mentioned above, Electronic device.

11. In claim 8, the other capacitor is, film capacitor, Electronic device.

12. In claim 8, the other capacitor is, ceramic capacitor, Electronic device.

13. In claim 1, the power supply circuit is, Includes other capacitors, The other capacitor mentioned above is, It includes one end connected to a node on a signal path where a power signal is transmitted, and the other end connected to another node between another transistor and another resistor, and The above switching circuit is, Configured to connect the other end of the other capacitor to either the other resistor or the other ground node, depending on the voltage of one end of the other capacitor. Electronic device.

14. In claim 13, the other transistor is, A drain electrode connected to the other node and a source electrode connected to the other ground node, Electronic device.

15. In claim 13, the other transistor is, It is the third transistor, and The above switching circuit is, Including the above third transistor and fourth transistor, The above third transistor is, It includes a drain electrode connected to the other end of the other capacitor, and a source electrode connected to the other drain electrode of the fourth transistor, and The above fourth transistor is, A different drain electrode and a different source electrode connected to the different ground node, comprising Electronic device.

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