Power supply device, operating method thereof, and display device

Abstract

The power supply device includes: an EMI filter; a rectifying unit that rectifies the AC voltage that has passed through the EMI filter; a power factor compensation unit that performs power factor compensation on the rectified voltage and outputs a DC voltage; and a control circuit that controls the power factor compensation unit. The power factor compensation part comprises a capacitor which is connected to the output end of the rectification part; an inductor connected in parallel with the capacitor; and a switch connected in parallel with the inductor. The control circuit may obtain whether the capacitor is abnormal based on a detection signal detected by the inductor, and differently control switching of the switch according to whether the capacitor is abnormal.

Description

Technical Field

[0001] The embodiments relate to a power supply device, an operating method thereof, and a display device. Background Art

[0002] In recent years, with the development of electronic technology, various types of display devices are developed and popularized, and the demand for large-scale display devices is increasing.

[0003] In particular, as the display device becomes larger, power consumption increases. In order to stably supply the high power consumption, the large display device has a power supply device including a power factor correction (PFC) circuit and an EMI filter.

[0004] The PFC circuit has capacitors and switches for power factor compensation. The capacitor may open due to external factors such as cracks caused by external impact or component failures such as capacity reduction caused by internal foreign matter. Thus, when the capacitor opens, the operating frequency of the switch changes due to changes in input voltage.

[0005] When the changing operating frequency resonates with the cutoff frequency of the EMI filter, the EMI filter generates heat and is damaged, or a power line connected to the EMI filter or electronic components around the EMI filter are burned or damaged, thereby reducing product reliability. Summary of the invention

[0006] Problem that the invention aims to solve

[0007] The embodiment provides a power supply device, an operation method thereof, and a display device. The power supply device can quickly detect abnormalities of capacitors and take corresponding measures to prevent heating of EMI filters, thereby improving product reliability.

[0008] The embodiment provides a power supply device, an operation method thereof, and a display device. The power supply device can improve the accuracy of determining whether a capacitor is abnormal by using a learning model.

[0009] Means used to solve problems

[0010] According to one aspect of the embodiment, a power supply device includes: an EMI filter; a rectifier unit, which rectifies the AC voltage that has passed through the EMI filter; a power factor compensation unit, which performs power factor compensation on the rectified voltage and outputs a DC voltage; and a control circuit, which controls the power factor compensation unit; the power factor compensation unit includes: a capacitor, which is connected to the output end of the rectifier unit; an inductor, which is connected in parallel with the capacitor; and a switch, which is connected in parallel with the inductor; the control circuit can obtain whether the capacitor is abnormal based on a detection signal detected by the inductor, and control the switching of the switch differently according to whether the capacitor is abnormal.

[0011] The control circuit may include: a first terminal receiving a detection signal detected by the inductor; and a second terminal outputting a first switching control signal or a second switching control signal generated based on the detection signal to the switch.

[0012] When the capacitor is normal, the control circuit can control the switching of the switch according to the first switching control signal to charge and discharge energy of the inductor. The first switching control signal can include a control signal that periodically has a first level and a second level different from the first level.

[0013] In the event that an abnormality exists in the capacitor, the control circuit may suspend the operation of the switch according to the second switching control signal. The second switching control signal may include a control signal having a constant level.

[0014] The control circuit obtains whether a detection signal detected by the inductor is received through the first terminal, and when the detection signal is not received and the interval in which the detection signal is not received is longer than a preset reference interval, it can be determined that an abnormality exists in the capacitor. When the number of times the detection signal is not received is longer than a preset reference number, the control circuit can determine that an abnormality exists in the capacitor.

[0015] The power supply device may include a memory for storing a benchmark setting learning model. The control circuit monitors the surrounding power conditions, uses a preset benchmark interval, a preset benchmark number, and the monitored surrounding power conditions as input to learn the benchmark setting learning model, outputs at least one of a benchmark interval and a benchmark number, and stores the output benchmark interval or the benchmark number in the memory.

[0016] The control circuit can obtain whether a detection signal detected by the inductor is received through the first terminal, and if the detection signal is not received, obtain whether the capacitor is abnormal using at least one of a reference interval and a reference number stored in the memory.

[0017] The abnormality of the capacitor may indicate that the capacitor is open-circuited.

[0018] According to another aspect of the embodiment, the operation method of the power supply device includes: a step of rectifying the AC voltage that has passed through the EMI filter by a rectifying unit; a step of performing power factor compensation on the rectified voltage by a power factor compensation unit to output a DC voltage; and a step of controlling the power factor compensation unit by a control circuit unit. The power factor compensation unit includes: a capacitor connected to the output end of the rectifying unit; an inductor connected in parallel with the capacitor; and a switch connected in parallel with the inductor. The step of controlling the power factor compensation unit may include: a step of obtaining whether the capacitor is abnormal based on a detection signal detected by the inductor; and a step of controlling the switching of the switch differently according to whether the capacitor is abnormal.

[0019] The step of controlling the power factor compensation unit may include: a step of receiving a detection signal detected by the inductor through a first terminal of the control circuit unit; and a step of outputting a first switching control signal or a second switching control signal generated based on the detection signal to the switch through a second terminal of the control circuit unit.

[0020] The step of controlling the power factor compensation unit may include: when the capacitor is normal, controlling the switching of the switch according to the first switching control signal to charge and discharge energy of the inductor.

[0021] The step of controlling the power factor compensation unit may include the step of stopping the operation of the switch according to the second switching control signal when an abnormality occurs in the capacitor.

[0022] The step of controlling the power factor compensation unit may include: a step of obtaining whether a detection signal detected by the inductor is received through the first terminal; and a step of determining that an abnormality exists in the capacitor when the detection signal is not received and when an interval in which the detection signal is not received is above a preset reference interval.

[0023] The step of controlling the power factor compensation part may include the step of obtaining whether a detection signal detected by the inductor is received through the first terminal; and

[0024] The step of determining that an abnormality exists in the capacitor when the number of times the detection signal is not received is greater than a preset reference number of times.

[0025] The step of controlling the power factor compensation unit may include: a step of monitoring the surrounding power conditions; a step of learning the benchmark setting learning model using a preset benchmark interval, a preset benchmark number, and the monitored surrounding power conditions as inputs, and outputting at least one of a benchmark interval and a benchmark number; and a step of storing the outputted benchmark interval or the benchmark number in a memory.

[0026] The step of controlling the power factor compensation unit may include: a step of obtaining whether a detection signal detected by the inductor is received through the first terminal; and a step of obtaining whether the capacitor is abnormal by using at least one of a reference interval and a reference number stored in the memory when the detection signal is not received.

[0027] According to another aspect of the embodiment, the display device includes: a power supply device; and a display, which uses the power of the power supply device to display an image; the power supply device includes: an EMI filter; a rectifier, which rectifies the AC voltage that has passed through the EMI filter; a power factor compensation unit, which performs power factor compensation on the rectified voltage and outputs a DC voltage; and a control circuit, which controls the power factor compensation unit, and the power factor compensation unit includes: a capacitor connected to the output end of the rectifier; an inductor, which is connected in parallel with the capacitor; and a switch, which is connected in parallel with the inductor. The control circuit can obtain whether the capacitor is abnormal based on the detection signal detected by the inductor, and control the switching of the switch differently according to whether the capacitor is abnormal.

[0028] Effects of the Invention

[0029] The embodiment may change the switching control of the switch according to whether there is an abnormality in the first capacitor.

[0030] For example, when the first capacitor is normal, the switch is periodically turned on / off, so that the DC voltage after power factor compensation can be charged into the second capacitor.

[0031] For example, if there is an abnormality in the first capacitor, the switch may be continuously disconnected. Therefore, the EMI filter is prevented from heating due to the resonance between the drive frequency of the switch and the cutoff frequency of the EMI filter, thereby improving product reliability. The first capacitor may be open-circuited due to external factors such as cracks caused by external impact or component defects such as capacity reduction caused by internal foreign matter.

[0032] The switch may be switched and controlled by a detection signal of a sensor that detects a current flowing in the inductor.

[0033] In an embodiment, such a detection signal can be used to determine whether the first capacitor is abnormal. For example, if the detection signal is not detected (or received) in a certain interval or the corresponding interval lasts for a certain number of times, it can be determined that the first capacitor is abnormal.

[0034] Therefore, since the detection signal used for switching control of the switch is also used to determine whether the first capacitor is abnormal, there is no need to configure a sensor separately, which can simplify the circuit structure and reduce costs.

[0035] On the other hand, in the embodiment, not only the interval in which the detection signal is not detected and the number of repetitions of the interval are considered, but also the surrounding power conditions are taken into account, and a reference setting learning model is used to learn this information, so that the best reference interval or reference number can be obtained. Thus, by considering the surrounding power conditions, misjudgment of the abnormality of the first capacitor is prevented, and the best reference interval or reference number is used to more accurately judge whether the first capacitor is abnormal, thereby improving product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a diagram showing a display device according to an embodiment.

[0037] Figure 2 yes Figure 1 An example of an internal block diagram of a display device.

[0038] Figure 3 : is a block diagram showing a power supply device according to the embodiment.

[0039] Figure 4 1 is a circuit diagram showing a power supply device according to an embodiment.

[0040] Figure 5 This is a waveform diagram showing the power factor compensation unit operating normally.

[0041] Figure 6 It is shown that the switch is turned on, and the first DC voltage and energy are charged to the power factor compensation part.

[0042] Figure 7 It is shown that the switch is opened and a second DC voltage is generated in the power factor compensation part.

[0043] Figure 8 It indicates that there is an abnormality in the first capacitor of the power factor compensation unit.

[0044] Fig. 9This figure shows a waveform diagram when an abnormality occurs in the first capacitor of the power factor compensation unit.

[0045] Fig.10 It is a sequence diagram for explaining the operation method of the power supply device of the embodiment.

[0046] Fig.11 This is a sequence diagram for explaining a method of determining whether the first capacitor of the power factor compensation unit is abnormal.

[0047] Fig.12 This is a sequence diagram for explaining a first method of identifying an abnormality in a first capacitor of a power factor compensation unit.

[0048] Fig.13 It is a sequence diagram for explaining a second method of identifying an abnormality of the first capacitor of the power factor compensation unit.

[0049] Fig.14 It is a sequence diagram for explaining a third method of identifying an abnormality of the first capacitor of the power factor compensation unit.

[0050] Fig.15 A benchmarking learning model of an embodiment is shown.

[0051] Fig.16 This is a sequence diagram for explaining a benchmark setting method using a benchmark setting learning model according to the embodiment.

[0052] Fig.17 It is to explain the use Fig.16 A sequence diagram of a method for determining whether the first capacitor of the power factor compensation unit is abnormal based on the reference set in FIG.

[0053] Fig.18 The waveform diagrams are respectively of the input AC current, the first DC voltage, and the detection signal when the power factor compensation unit operates normally.

[0054] Fig.19a The waveform diagrams of the input AC current, the first DC voltage, and the detection signal at the first time point when an abnormality occurs in the first capacitor are shown.

[0055] Fig.19b The waveform diagrams show the input AC current, the first DC voltage, and the detection signal at the second time point when an abnormality occurs in the first capacitor.

[0056] Fig. 20 Is magnification Fig.19b A magnified image of area A. DETAILED DESCRIPTION

[0057] Hereinafter, embodiments will be described in more detail with reference to the accompanying drawings.

[0058] The suffixes "module" and "unit" used in the following description for the constituent elements are simply given for the convenience of writing this specification, and do not have any important meaning or function. Therefore, the "module" and "unit" can also be used interchangeably.

[0059] Figure 1 It is a diagram showing a display device according to an embodiment.

[0060] Referring to the drawings, the display device 100 may include a display 180 .

[0061] On the other hand, the display 180 may be implemented as any one of various panels, for example, the display 180 may be any one of a liquid crystal display panel (LCD panel), an organic light emitting panel (OLED panel), an inorganic light emitting panel (LED panel), and the like.

[0062] In an embodiment, the display 180 may be an organic light emitting panel (OLED panel), but is not limited thereto.

[0063] on the other hand, Figure 1 The display device 100 may be a monitor, a TV, a tablet PC, a mobile terminal, etc.

[0064] Figure 2 yes Figure 1 An example of an internal block diagram of a display device.

[0065] Reference Figure 2 According to the embodiment, the display device 100 may include a broadcast receiving unit 105, an external device interface unit 130, a memory 140, a user input interface unit 150, a sensor unit (not shown), a control unit 170, a display 180, an audio output unit 185, and a power supply device 190.

[0066] The broadcast receiving unit 105 may include a tuner unit 110 , a demodulation unit 120 , a network interface unit 135 , and an external device interface unit 130 .

[0067] On the other hand, unlike the drawings, the broadcast receiving unit 105 may include only the tuner unit 110, the demodulator 120, and the external device interface unit 130. That is, the network interface unit 135 may not be included.

[0068] The tuner unit 110 selects a channel selected by a user or a RF broadcast signal corresponding to all stored channels from among RF (Radio Frequency) broadcast signals received via an antenna (not shown), and converts the selected RF broadcast signal into an intermediate frequency signal or a baseband video or audio signal.

[0069] For example, if the selected RF broadcast signal is a digital broadcast signal, it is converted into a digital IF signal (DIF), and if it is an analog broadcast signal, it is converted into an analog baseband image or audio signal (CVBS / SIF). That is, the tuner unit 110 can process a digital broadcast signal or an analog broadcast signal. The analog baseband image or audio signal (CVBS / SIF) output from the tuner unit 110 can be directly input to the control unit 170.

[0070] On the other hand, the tuner unit 110 may include a plurality of tuners to receive broadcast signals of a plurality of channels, or may be a single tuner that simultaneously receives broadcast signals of a plurality of channels.

[0071] The demodulation unit 120 receives the digital IF signal DIF converted in the tuner unit 110 and performs a demodulation operation.

[0072] The demodulation unit 120 may output a stream signal TS after performing demodulation and channel decoding. In this case, the stream signal may be a signal multiplexed with a video signal, an audio signal, or a data signal.

[0073] The stream signal output from the demodulation unit 120 may be input to the control unit 170 . The control unit 170 performs demultiplexing, video / audio signal processing, and the like, and then outputs the video to the display 180 and the audio to the audio output unit 185 .

[0074] The external device interface unit 130 may transmit or receive data with a connected external device (not shown) such as a set-top box. To this end, the external device interface unit 130 may include an A / V input and output unit (not shown).

[0075] The external device interface unit 130 can be connected to external devices such as DVD (Digital Versatile Disk), Blu-ray, game equipment, camera, camcorder, computer (notebook), set-top box, etc. through wired / wireless connection, and can also perform input / output operations with the external devices.

[0076] The A / V input / output unit can receive video and audio signals from an external device. On the other hand, the wireless communication unit (not shown) can perform short-range wireless communication with other electronic devices.

[0077] Through such a wireless communication unit (not shown), the external device interface unit 130 can exchange data with an adjacent mobile terminal (not shown). In particular, the external device interface unit 130 can receive device information, executed application information, application images, etc. from a mobile terminal (not shown) in the mirroring mode.

[0078] The network interface part 135 provides an interface for connecting the display device 100 with a wired / wireless network including the Internet. For example, the network interface part 135 may receive content or data provided by the Internet or a content provider or a network operator through a network.

[0079] On the other hand, the network interface unit 135 may include a wireless communication unit (not shown).

[0080] The memory 140 may store programs for various signal processing and control in the control unit 170 , and may also store image, audio, or data signals after signal processing.

[0081] In addition, the memory 140 may also function to temporarily store the image, audio or data signal input to the external device interface unit 130. In addition, the memory 140 may store information related to a predetermined broadcast channel through a channel memory function such as a channel map.

[0082] Although Figure 2 The memory 140 is shown as an embodiment configured separately from the control unit 170 , but the scope of the embodiment is not limited thereto. The memory 140 may be included in the control unit 170 .

[0083] The user input interface unit 150 transmits a signal input by a user to the control unit 170 , or transmits a signal from the control unit 170 to the user.

[0084] For example, user input signals such as power on / off, channel selection, screen setting, etc. are sent / received with the remote control device 200, or user input signals input from local keys (not shown) such as the power button, channel button, volume button, setting value, etc. are transmitted to the control unit 170, or user input signals input from the sensor unit (not shown) that senses the user's gestures are transmitted to the control unit 170, or signals from the control unit 170 can be sent to the sensor unit (not shown).

[0085] The control unit 170 may demultiplex a stream input through the tuner unit 110 , the demodulator unit 120 , the network interface unit 135 , or the external device interface unit 130 , or may process a demultiplexed signal to generate and output a signal for video or audio output.

[0086] The image signal processed by the control unit 170 is input to the display 180 and can be displayed as an image corresponding to the image signal. In addition, the image signal processed by the control unit 170 can be input to an external output device through the external device interface unit 130.

[0087] The audio signal processed in the control unit 170 may be output as sound to the audio output unit 185. In addition, the audio signal processed in the control unit 170 may be input to an external output device through the external device interface unit 130.

[0088] Although Figure 2 Not shown, the control unit 170 may include a demultiplexing unit, an image processing unit, etc. Figure 3 To be described later.

[0089] In addition, the control unit 170 may control the overall operation of the display device 100. For example, the control unit 170 may control the tuner unit 110 to select (Tuning) a channel selected by a user or an RF broadcast corresponding to a stored channel.

[0090] In addition, the control part 170 may control the display apparatus 100 according to a user command input through the user input interface part 150 or an internal program.

[0091] On the other hand, the control unit 170 can control the display 180 to display an image. At this time, the image displayed on the display 180 can be a still image or a video, and can be a 2D image or a 3D image.

[0092] On the other hand, the control unit 170 can display a predetermined object in the image displayed on the display 180. For example, the object can be at least one of a connected web page screen (newspaper, magazine, etc.), EPG (Electronic Program Guide), various menus, widgets, icons, still images, videos, and texts.

[0093] On the other hand, the control unit 170 can recognize the position of the user based on the image captured by the camera unit (not shown). For example, the distance (z-axis coordinate) between the user and the display device 100 can be grasped. In addition, the x-axis coordinate and the y-axis coordinate corresponding to the user's position in the display 180 can be grasped.

[0094] The display 180 converts the image signal, data signal, OSD signal, control signal, etc. processed in the control unit 170 or the image signal, data signal, control signal, etc. received from the external device interface unit 130 to generate a driving signal.

[0095] On the other hand, the display 180 is constituted by a touch screen, and can be used as an input device in addition to an output device.

[0096] The audio output unit 185 receives the signal audio-processed by the control unit 170 and outputs the signal as audio.

[0097] The photographing unit (not shown) photographs the user. The photographing unit (not shown) may be implemented by one camera, but is not limited thereto and may be implemented by a plurality of cameras. Image information photographed by the photographing unit (not shown) may be input to the control unit 170 .

[0098] The control unit 170 may detect the user's gesture based on an image captured by the imaging unit (not shown) or a signal detected by the sensor unit (not shown) or a combination thereof.

[0099] The power supply device 190 supplies corresponding power to the entire display device 100. In particular, power can be supplied to the control unit 170 that can be implemented in the form of a system on chip (SOC), the display 180 for displaying images, and the audio output unit 185 for outputting audio.

[0100] Specifically, the power supply device 190 may include a converter that converts AC power into DC power and a DC / DC converter that converts the level of DC power.

[0101] The remote control device 200 sends the user input to the user input interface unit 150. To this end, the remote control device 200 can use Bluetooth, RF (Radio Frequency) communication, infrared (IR) communication, UWB (UltraWideband), ZigBee, etc. In addition, the remote control device 200 can receive the image, audio or data signal output from the user input interface unit 150, and display it in the remote control device 200 or output it as audio.

[0102] On the other hand, the display device 100 may be a fixed or mobile digital broadcast receiver capable of receiving digital broadcasts.

[0103] on the other hand, Figure 2 The block diagram of the display device 100 shown in the figure is a block diagram for an embodiment. The components of the block diagram can be integrated, added or omitted according to the specifications of the display device 100 actually implemented. That is, it can be configured to combine two or more components into one component as needed, or one component can be subdivided into two or more components. In addition, the functions performed in each frame are used to illustrate the embodiment, and the specific actions or devices thereof do not limit the scope of rights of the embodiment.

[0104] on the other hand, Figure 2The unspecified symbol 141 is a benchmark setting learning model, which can be stored in the memory 140. The benchmark setting learning model 141 can learn the preset benchmark interval, the preset benchmark number and the surrounding power conditions, and output at least one of the benchmark interval and the benchmark number. Here, the benchmark interval or the benchmark number output from the benchmark setting learning model 141 is used to determine the power factor compensation unit ( Figure 3 and Figure 4 The reference of whether the first capacitor 331 of the capacitor 330 is abnormal can be the best judgment reference of the continuous learning output through the reference setting learning model 141. The reference setting learning model 141 will be described in detail later.

[0105] Figure 3 : is a block diagram showing a power supply device according to the embodiment. Figure 4 1 is a circuit diagram showing a power supply device according to an embodiment.

[0106] Reference Figure 3 and Figure 4 The power supply device 300 of the embodiment may include an EMI filter 310 , a rectifying unit 320 , a power factor compensating unit 330 , and a control circuit 350 .

[0107] The power supply device 300 of the embodiment can be Figure 2 The power supply device 190 is shown, but is not limited to this.

[0108] Although the control circuit 350 is shown in the figure as being included in the power supply device 300, it may also be included in Figure 2 In the control unit 170 shown in FIG.

[0109] The EMI filter 310 can remove noise generated at the input side of the rectifier 320 so that the input voltage Vin input to the rectifier 320 does not contain noise. The input voltage Vin is an AC voltage Vin, which can be a voltage supplied from an external substation to the home. The input voltage Vin and the AC voltage Vin may be used interchangeably below.

[0110] For example, the EMI filter 310 may include an inductor 312 and capacitors 311 and 313 disposed at the front end / rear end of the inductor 312, but is not limited thereto. The EMI filter 310 may be designed to remove noise frequencies above a specific frequency, i.e., a cut-off frequency. By the EMI filter 310 disposed at the front end of the rectifier 320, noise frequencies above the cut-off frequency are removed, so that an AC voltage Vin without noise can be input to the rectifier 320.

[0111] The rectifying unit 320 may rectify the AC voltage Vin passing through the EMI filter 310 and output the first DC voltage Vdc1. For example, the rectifying unit 320 may include four diodes (321 to 324), but is not limited thereto.

[0112] The power factor compensation unit 330 may perform power factor compensation on the first DC voltage Vdc1 and output a second DC voltage Vdc2 .

[0113] The power factor compensation unit 330 may adjust the phase of the current on the load side so that the difference between the phase of the input voltage Vin input from the outside, ie, the AC voltage Vin, and the phase of the current on the load side is reduced or made consistent.

[0114] To this end, the power factor compensation unit 330 may include a first capacitor 331, an inductor 332, a second capacitor 333, and a switch 334. The switch 334 may be a FET switch as a semiconductor switch, but is not limited thereto.

[0115] The first capacitor 331 is a component for charging the first DC voltage Vdc1 of the rectifier 320. Although the first capacitor 331 is shown in the figure as being included in the power factor compensation unit 330, it may also be included in the rectifier 320. That is, the output ends of the four diodes (321 to 324) provided in the rectifier 320 can play a role in smoothing the voltage rectified by the four diodes (321 to 324).

[0116] The inductor 332 is connected in parallel with the first capacitor 331 and can be charged and discharged by the switching control of the switch 334. For example, when the switch 334 is turned on, energy is charged in the inductor 332, so that Figure 5 As shown, the current i flowing in the inductor 332 is L Here, the energy may be, for example, the output voltage of the rectifier 320, that is, the first DC voltage Vdc1, but is not limited thereto. For example, when the switch 334 is turned off, the energy charged in the inductor 332 may be charged to the second capacitor 333 together with the first DC voltage Vdc1 charged to the first capacitor 331. As a result, the inductor 332 is discharged, and the current i flowing in the inductor 332 is L Thus, the inductor 332 is charged and discharged by the switch 334 which is periodically switched, thereby the current i flowing in the inductor 332 is L Can be increased or decreased.

[0117] Although Figure 5 The current i of the inductor 332 is shown in L Increase or decrease linearly, but can also increase or decrease nonlinearly.

[0118] The switch 334 and the second capacitor 333 may be connected in parallel with the inductor 332. As described above, energy may be charged and discharged in the inductor 332 by switching control of the switch 334.

[0119] For example, Figure 6 As shown, when the switch 334 is turned on, the current i of the inductor 332 is L can flow through switch 334. Thus, energy is charged into inductor 332, as Figure 5 As shown, the current i flowing in the inductor 332 is L Can be increased.

[0120] The current i flowing in the inductor 332 L When the second critical value is exceeded, Figure 7 As shown, the switch 334 is turned off, and the first capacitor 331, the inductor 332 and the second capacitor 333 can be sequentially connected to form a current i L Therefore, if Figure 5 As shown, the current i flowing in the inductor 332 is L Can be reduced.

[0121] The current i flowing in the inductor 332 L When it becomes the first critical value again, Figure 6 As shown, the switch 334 is turned on, energy is charged into the inductor 332, and the current i flowing in the inductor 332 is L Here, although the first critical value may be 0, it is not limited thereto. Therefore, the current i flowing in the inductor 332 L When the current i flowing in the inductor 332 is zero, the switch 334 is turned on. L When the voltage increases and exceeds the second critical value, the switch 334 may be disconnected.

[0122] Therefore, through the first critical value and the second critical value, the switch 334 is periodically turned on / off, and energy can be periodically charged and discharged in the inductor 332. Conversely, since energy is periodically charged and discharged in the inductor 332, the switch 334 can be periodically turned on / off through the first critical value and the second critical value.

[0123] On the other hand, the power factor compensation unit 330 may include a sensor 335 for detecting the current i flowing in the inductor 332. L , as a basis for determining the switching control of switch 334.

[0124] Although the sensor 335 may be a coil wound around the inductor 332, it is not limited thereto. L , then the current i L The current is induced in the sensor 335, and a predetermined signal can be detected. Here, the signal can be a voltage or a current. The detected signal can be transmitted through the first terminal 351 of the control circuit 350.

[0125] As another example, two or more resistors for voltage distribution are provided on the basis of the coil wound around the sensor 335 , and the signal detected in the coil is converted into a voltage signal, and the corresponding voltage signal can be transmitted through the first terminal 351 of the control circuit 350 .

[0126] In an embodiment, the detected signal may be referred to as a detection signal ZCD.

[0127] On the other hand, the control circuit 350 may generate a switching control signal CS for switching control of the switch 334 based on the detection signal received through the first terminal 351. The switching control signal CS may be output to the switch 334 through the second terminal 352.

[0128] According to an embodiment, the switching control signal CS may include a first switching control signal CS1 and a second switching control signal CS2 .

[0129] The first switching control signal CS1 and the second switching control signal CS2 may be generated according to whether there is an abnormality in the first capacitor 331. For example, when the first capacitor 331 is normal, the first switching control signal CS1 is generated, and when there is an abnormality in the first capacitor 331, the second switching control signal CS2 may be generated.

[0130] As mentioned above, the first capacitor 331 is Figure 4 As shown, it is included in the power factor compensation unit 330, or although not shown, it can be included in the rectification unit 320, and can be a component for charging the first DC voltage Vdc1 of the rectification unit 320.

[0131] Generally, the first capacitor 331 is an electronic component that can be mounted on a PCB substrate or board by welding or the like. The first capacitor 331 may be open-circuited due to external factors such as cracks caused by external impact or component failure such as capacity reduction caused by internal foreign matter. Here, the open circuit X may refer to Figure 8 As shown, the first capacitor 331 and the power line are electrically disconnected. Therefore, the current of the power line may not flow to the first capacitor 331, and the voltage of the power line may not be charged to the first capacitor 331.

[0132] like Fig.18As shown, when there is no open circuit in the first capacitor 331 and the first capacitor 331 operates normally, the input current i11, the first DC voltage Vdc1, the second DC voltage Vdc2 and the detection signal ZCD can be generated normally.

[0133] However, if Fig.19a and Fig.19b As shown, when the first capacitor 331 is open and an abnormality occurs in the first capacitor 331 , it is known that the peak value of the input current i11 increases sharply, and the first DC voltage Vdc1 and the detection signal are also abnormally generated. Fig.19b is a diagram showing the waveform at the second time point. It can be seen that Fig.19a Compared with the waveform at the first time point, the peak value of the input current i11 increases more sharply. Here, the second time point means a longer time than the first time point, for example, the first time point may be 10 minutes, and the second time point may be 20 minutes, but it is not limited thereto.

[0134] When the peak value of the input current i11 increases sharply, the EMI filter 310 generates heat and the temperature may rise.

[0135] In particular, when an abnormality exists in the first capacitor 331, the AC voltage Vin passing through the EMI filter 310 changes, and the driving frequency for controlling the switch 334 may also change through the change of the AC voltage Vin. Normally, the driving frequency of the switch 334 is greater than the cut-off frequency of the EMI filter 310, but the driving frequency of the switch 334 may be reduced through the change of the AC voltage Vin. In the case where the driving frequency of the switch 334 is reduced and becomes the same as the cut-off frequency of the EMI filter 310, the cut-off frequency of the EMI filter 310 resonates due to the driving frequency of the switch 334, thereby promoting and accelerating the heating of the EMI filter 310. In this case, the temperature of the EMI filter 310 rises to more than 100°C, the EMI filter 310 itself is burned or the PCB substrate or board on which the EMI filter 310 is installed is burned, so there is a problem of significantly reduced product reliability.

[0136] In the embodiment, the switching control of the switch 334 can be different depending on whether the first capacitor 331 has an abnormality. Even if the first capacitor 331 has an abnormality, the damage of the EMI filter 310 can be prevented, thereby improving product reliability.

[0137] To this end, the control circuit 350 may generate the first switching control signal CS1 or the second switching control signal CS2 according to whether the first capacitor 331 is abnormal.

[0138] The first switching control signal CS1 or the second switching control signal CS2 may be generated based on the detection signal ZCD detected by the inductor 332 of the power factor compensation part 330 .

[0139] For example, when the first capacitor 331 is normal, Figure 5 As shown, the detection signal can be detected normally and received through the first terminal 351 of the control circuit 350. The control circuit 350 can generate a first switching control signal CS1 based on the detected detection signal and output the first switching control signal CS1 to the switch 334 through the second terminal 352.

[0140] The first switching control signal CS1 may include a control signal that periodically has a first level Lev1 and a second level Lev2. The first level Lev1 and the second level Lev2 have different values, the first level Lev1 may be a high level, and the second level Lev2 may be a low level smaller than the first level Lev1, but is not limited thereto. For example, the switch 334 may be turned on by the first level Lev1 and turned off by the second level Lev2.

[0141] The first level Lev1 has a current i flowing in the inductor 332. L The current i flowing in the inductor 332 from the lowest point to L The first interval from the highest point to the highest point, and the second level Lev2 may have a current i flowing in the inductor 332. L The current i flowing in the inductor 332 from the peak to the peak L That is, the first switching control signal CS1 can be generated, which has a first level Lev1 during a first interval of one cycle and has a second level Lev2 during a second interval of one cycle.

[0142] like Figure 6 As shown, when the switch 334 is turned on by the first level Lev1 of the first switching control signal CS1, as energy is charged into the inductor 332, the current i flowing in the inductor 332 is L May increase.

[0143] As the current i flows in the inductor 332 L increases, the detection signal detected by the sensor 335 may also increase.

[0144] When the detection signal exceeds the second critical value, the current i flowing in the inductor 332 LWhen the peak value is reached, the control circuit 350 may output the first switching control signal CS1 having the second level Lev2 to the switch 334 through the second terminal 352. Figure 7 As shown, by the first switching control signal CS1 having the second level Lev2, the switch 334 is turned off, and the energy charged in the inductor 332 can be charged into the second capacitor 333 as the second DC voltage Vdc2 together with the first DC voltage Vdc1 of the first capacitor 331. The second DC voltage Vdc2 can be greater than the first DC voltage Vdc1. For example, the first DC voltage Vdc1 can be 330V, and the second DC voltage Vdc2 can be 400V, but it is not limited thereto.

[0145] As the energy charged in the inductor 332 is charged into the second capacitor 333, the inductor 332 is discharged, and thus the current i flowing in the inductor 332 is L can be reduced. As the current i flowing in the inductor 332 L decreases, the current i flowing in the inductor 332 L The detection signal can also be reduced.

[0146] When the detection signal decreases and becomes 0, the control circuit 350 may generate the first switching control signal CS1 having the first level Lev1 again, and output it to the switch 334 through the second terminal 352. Figure 6 As shown, switch 334 is turned on so that energy can be charged into inductor 332 .

[0147] Therefore, when the first capacitor 331 is normal, the control circuit 350 may generate the first switching control signal CS1 having the first level Lev1 and the second level Lev2 .

[0148] On the other hand, in the case where there is an abnormality in the first capacitor 331 , the control circuit 350 may generate the second switching control signal CS2 having a constant level Lev3 .

[0149] In the case where there is an abnormality in the first capacitor 331, that is, the first capacitor 331 is open-circuited, as shown in FIG. Fig.19a and Fig.19b As shown, the input current i11, the first DC voltage Vdc1 and the detection signal are also similar to the waveforms of the first capacitor 331 when it is normal ( Fig.18 )different.

[0150] For example, the peak value of the input current i11 may increase sharply. In particular, if Fig. 20 As shown, an interval I in which the detection signal is not detected may be generated periodically.

[0151] like Fig. 9As shown, an interval I in which there is no detection signal may be generated periodically. In the case where there is an abnormality in the first capacitor 331 , the control circuit 350 may receive the detection signal detected in the inductor 332 through the first terminal 351 .

[0152] The interval I in which the detection signal does not exist may not be received through the first terminal 351. Therefore, the control circuit 350 can confirm whether the detection signal is not received through the first terminal 351, and if not, how many intervals the detection signal is not received.

[0153] The control circuit 350 may generate a second switching control signal CS2 having a constant level Lev3 based on the interval I in which the detection signal is periodically absent in the detection signal received through the first terminal 351, and output the second switching control signal CS2 to the switch 334 through the second terminal 352. The constant level Lev3 may be a level that can disconnect the switch 334. Therefore, the switch 334 may be continuously disconnected according to the constant level Lev3. That is, the operation of the switch 334 may be continuously suspended.

[0154] The control circuit 350 may determine whether there is an abnormality in the first capacitor 331 by considering the width of the interval I in which the detection signal does not exist or the number of occurrences of the corresponding interval.

[0155] For example, the control circuit 350 may determine that an abnormality exists in the first capacitor 331 when the width of the interval I in which the detection signal does not exist is greater than a preset reference interval.

[0156] For example, when the number of occurrences of interval I in which no detection signal exists is greater than a preset reference number of times, the control circuit 350 may determine that an abnormality exists in the first capacitor 331 .

[0157] like Fig. 9 As shown, when the number of occurrences of interval I in which the detection signal does not exist is three times, the control circuit 350 determines that there is an abnormality in the first capacitor 331 and can generate a second switching control signal CS2 with a constant level Lev3.

[0158] Although Fig. 9 The number of occurrences is shown as three times, but it can also be two times or four times or more.

[0159] When determining that there is an abnormality in the first capacitor 331, the control circuit 350 may generate a second switching control signal CS2 having a constant level Lev3 and output the second switching control signal CS2 to the switch 334 through the second terminal 352. The switch 334 may be turned off according to the constant level Lev3 of the second switching control signal CS2.

[0160] Since the switch 334 is not periodically turned on / off but is continuously turned off, there is no driving frequency of the switch 334. Therefore, the driving frequency of the switch 334 will no longer resonate with the cutoff frequency of the EMI filter 310, so the heating of the EMI filter 310 can be eliminated, and the temperature of the EMI filter 310 is reduced, thereby preventing fires caused by EMI itself or fires of PCB substrates or boards.

[0161] The unexplained symbol 336 may be activated during the initial driving of the power supply device 300 , and thus may also be referred to as a start-up bypass diode, but for the sake of convenience, it is collectively referred to as the bypass diode 112 .

[0162] For example, in the power factor compensation unit 330 without the bypass diode 336, if the AC voltage Vin is provided, it may be charged as a very large DC current through the inductor 332 to the second capacitor 333. In this case, an overvoltage occurs due to the large DC current, and the switch 334 may be damaged or fail.

[0163] In contrast, when the power factor compensation unit 330 has a bypass diode 336, when the power supply device 300 is started, the AC voltage Vin is charged into the second capacitor 333 via the bypass diode 336, so that no overvoltage occurs in the power supply device 300, thereby preventing damage or failure of the switch 334.

[0164] Unexplained reference numeral 337 denotes a reverse current prevention diode that prevents a reverse current caused by the second DC voltage Vdc2 charged in the second capacitor 333 from flowing to the inductor 332 .

[0165] On the other hand, Figure 3 As shown, the power supply device 300 according to the embodiment may include a plurality of converters 340 - 1 to 340 - n.

[0166] The plurality of converters 340-1 to 340-n may convert the second DC voltage Vdc2 output from the power factor compensator 330 into third voltages V1 to Vn different from each other. Here, the third voltages V1 to Vn may be DC voltages or AC voltages.

[0167] These third voltages V1 to Vn may be used to activate or operate various electronic components or driving devices.

[0168] Below, refer to Figures 10 to 17 The operation method of the power supply device 300 according to the embodiment is described. Figures 10 to 17 You can refer to the description of Figures 3 to 9 .

[0169] Fig.10 It is a sequence diagram for explaining the operation method of the power supply device according to the embodiment.

[0170] like Fig.10 As shown, the rectifying unit 320 may rectify the AC voltage Vin having passed through the EMI filter 310 ( S411 ).

[0171] The EMI filter 310 is disposed at the front end of the rectifying unit 320, and can remove noise flowing into the rectifying unit 320. The voltage rectified by the rectifying unit 320 can be a first DC voltage Vdc1.

[0172] The power factor compensation unit 330 may perform power factor compensation on the rectified voltage, ie, the first DC voltage Vdc1 , to output a second DC voltage Vdc2 ( S412 ).

[0173] like Figure 4 As shown, the power factor compensation unit 330 may include a first capacitor 331 , an inductor 332 , a second capacitor 333 , and a switch 334 .

[0174] The first capacitor 331 may be connected to the output end of the rectifying unit 320 , the inductor 332 may be connected in parallel with the first capacitor 331 , and the second capacitor 333 and the switch 334 may be connected in parallel with the inductor 332 .

[0175] The control circuit 350 may obtain whether there is an abnormality in the first capacitor 331 of the power factor compensation part 330 ( S413 ).

[0176] The control circuit 350 may control the switching of the switch 334 differently depending on whether the first capacitor 331 is abnormal.

[0177] For example, when the first capacitor 331 is normal, the control circuit 350 can control the switching of the switch 334 according to the first switching control signal CS1 (S414). As the switch 334 is periodically turned on / off according to the first switching control signal CS1, the inductor 332 is periodically charged and discharged, so that the second DC voltage Vdc2 can be charged into the second capacitor 333.

[0178] Specifically, according to Figure 5 According to the first switching control signal CS1 shown, the switch 334 can be periodically turned on / off. For example, the switch 334 can be turned on according to the first level Lev1 of the first switching control signal CS1, and the switch 334 can be turned off according to the second level Lev2 of the first switching control signal CS1.

[0179] When the switch 334 is turned on according to the first level Lev1 of the first switching control signal CS1, energy is charged into the inductor 332, thereby the current i flowing in the inductor 332 is L may increase. As the current i L As the voltage increases, the detection signal detected by the sensor 335 provided in the inductor 332 may also increase.

[0180] The control circuit 350 may receive the detection signal through the first terminal 351. A first critical value and a second critical value may be set in the control circuit 350. The second critical value may be greater than the first critical value.

[0181] The control circuit 350 obtains whether the detection signal is above the second critical value, and can generate a first switching control signal CS1 having a second level Lev2 when the detection signal is above the second critical value, and output the first switching control signal CS1 to the switch 334 through the second terminal 352. The switch 334 can be turned off according to the second level Lev2 of the first switching control signal CS1.

[0182] When the switch 334 is turned off, the energy charged in the inductor 332 can be charged into the second capacitor 333 as the second DC voltage Vdc2 together with the first DC voltage Vdc1 of the first capacitor 331. As a result, as the inductor 332 is discharged, the current i flowing in the inductor 332 is L In this case, the detection signal detected in the inductor 332 may also decrease.

[0183] The control circuit 350 obtains whether the decreasing detection signal is consistent with the first critical value, and generates a first switching control signal CS1 having a first level Lev1 when the detection signal is consistent with the first critical value, and outputs the first switching control signal CS1 to the switch 334 through the second terminal 352. The switch 334 can be turned on according to the first level Lev1 of the first switching control signal CS1.

[0184] In this way, by using the first critical value and the second critical value set in the control circuit 350, the switch 334 is periodically turned on / off, so that the inductor 332 is periodically charged and discharged, and the second DC voltage Vdc2 greater than the first DC voltage Vdc1 is charged to the second capacitor 333. On the other hand, the current i flowing in the inductor 332 can be adjusted. L The phase of the AC voltage Vin is adjusted to be consistent with the phase of the AC voltage Vin, minimizing the reactive power and thus compensating the power factor.

[0185] On the other hand, in the case of an abnormality in the first capacitor 331, the control circuit 350 can control the switching of the switch 334 according to the second switching control signal CS2 (S415). As the switch 334 is continuously disconnected according to the second switching control signal CS2, the driving frequency of the switch 334 no longer resonates with the cutoff frequency of the EMI filter 310, preventing the fire of the EMI filter 310 or the fire of the PCB substrate or board, thereby improving product reliability.

[0186] Specifically, when an abnormality occurs in the first capacitor 331 , an open circuit occurs in which the first capacitor 331 is electrically disconnected from the power line, and thus the voltage rectified in the rectifying unit 320 cannot be charged in the first capacitor 331 .

[0187] In this case, there is periodically no current i in the inductor 332. L The flow range, such as Fig. 9 As shown, there may be periodically an interval I in which the detection signal detected in the inductor 332 does not exist.

[0188] The control circuit 350 receives the detection signal through the first terminal 351 and can determine whether there is a section in which the detection signal is not received.

[0189] The control circuit 350 can determine whether the first capacitor 331 is abnormal based on the interval I in which no detection signal is received.

[0190] In the case where there is an abnormality in the first capacitor 331, the control circuit 350 may generate a second switching control signal CS2 having a constant level Lev3, and output the second switching control signal CS2 to the switch 334 through the second terminal 352. According to the constant level Lev3 of the second switching control signal CS2, the switch 334 may be continuously turned off. That is, the operation of the switch 334 may be continuously suspended.

[0191] Since the switch 334 is continuously disconnected, there is no driving frequency of the switch 334. Therefore, the driving frequency of the switch 334 no longer resonates with the cutoff frequency of the EMI filter 310, the heating of the EMI filter 310 is relieved, and the temperature of the EMI filter 310 is reduced, thereby preventing the fire of the EMI filter 310 itself or the fire of the PCB substrate or board, thereby improving product reliability.

[0192] Fig.11 This is a sequence diagram for explaining a method of determining whether the first capacitor of the power factor compensation unit is abnormal. Fig.11 It can be described in detail in Fig.10 The sequence diagram of S413 in .

[0193] like Fig.11 As shown, the control circuit 350 may receive a detection signal detected by the inductor 332 of the power factor compensation part 330 through the first terminal 351 ( S321 ).

[0194] The detection signal can be based on the current i flowing in the inductor 332 L That is, the current i flowing in the inductor 332 is L The more it increases, the more the detection signal can increase, and the current i flowing in the inductor 332 L The smaller it is, the smaller the detection signal is.

[0195] The control circuit 350 may obtain whether the detection signal is normally received ( S422 ).

[0196] For example, when the first capacitor 331 is normal, Figure 5 As shown, the current i flowing in the inductor 332 is L can be increased or decreased. Therefore, with the current i flowing in the inductor 332 L Correspondingly, the detected detection signal may also increase or decrease.

[0197] For example, in the case where there is an abnormality in the first capacitor 331, such as Fig. 9 As shown, there is no current i in the inductor 332 L There is an interval of flow, so there may also be an interval I where no detection signal is detected.

[0198] The control circuit 350 can obtain whether the detection signal is received normally through the first terminal 351 .

[0199] For example, when the detection signal received through the first terminal 351 is Figure 5 As shown, in the case of periodic increase or decrease, the control circuit 350 may determine that the first capacitor 331 is normal (S422).

[0200] For example, the detection signal received by the first terminal 351 is as follows: Fig. 9 As shown, there is no detection signal during a certain interval I. When no detection signal is received through the first terminal 351 during the interval I, the control circuit 350 can determine that there is an abnormality in the first capacitor 331 (S424).

[0201] Reference Figure 12 to Figure 14 A method of determining whether the first capacitor is abnormal is described.

[0202] Fig.12 This is a sequence diagram for explaining a first method of identifying an abnormality in a first capacitor of a power factor compensation unit.

[0203] like Fig.12 As shown, the control circuit 350 can obtain whether the detection signal is normally received through the first terminal 351 (S431).

[0204] For example, when receiving the Figure 5 In the case of the detection signal shown, the control circuit 350 may determine that the first capacitor 331 is normal (S432).

[0205] For example, when the first terminal 351 does not receive Fig. 9 In the case of the detection signal shown, the control circuit 350 can determine whether there is an interval in which the detection signal is not received. In the case of an interval in which the detection signal is not received, the control circuit 350 can determine whether the interval in which the detection signal is not received is longer than a preset reference interval (S433).

[0206] When the interval in which the detection signal is not received is shorter than the preset reference interval, the control circuit 350 may determine that the first capacitor 331 is normal because the detection signal is temporarily not received due to external environment such as unstable power.

[0207] When the interval in which the detection signal is not received is longer than the preset reference interval, the control circuit 350 may determine that the first capacitor 331 is abnormal (S434). That is, the control circuit 350 may determine that the first capacitor 331 is abnormal and is open due to a component defect such as a crack caused by an external impact or a capacity reduction caused by an internal foreign object.

[0208] Fig.13 It is a sequence diagram for explaining a second method of identifying an abnormality of the first capacitor of the power factor compensation unit.

[0209] Fig.13 S441 and S442 Fig.12 S431 and S432 shown are the same, so detailed description is omitted.

[0210] like Fig.13 As shown, when no signal is received through the first terminal 351 Fig. 9 In the case of the detection signal shown, the control circuit 350 can obtain whether there is an interval in which the detection signal is not received. In the case of an interval in which the detection signal is not received, the control circuit 350 can obtain whether there are repeated intervals in which the detection signal is not received. The control circuit 350 can obtain whether the number of intervals in which the detection signal is not received is greater than a preset reference number (S443).

[0211] When the number of intervals in which the detection signal is not received is less than a preset reference number, the control circuit 350 may determine that the first capacitor 331 is normal because the detection signal is temporarily not received due to external environment such as unstable power.

[0212] When the number of intervals in which the detection signal is not received is less than the preset reference number, the control circuit 350 may determine that the first capacitor 331 is abnormal (S444). That is, the control circuit 350 may determine that the first capacitor 331 is abnormal and is open due to a component defect such as a crack caused by an external impact or a capacity reduction caused by an internal foreign object.

[0213] Fig.14 It is a sequence diagram for explaining a third method of identifying an abnormality of the first capacitor of the power factor compensation unit.

[0214] Fig.14 S451 and Fig.12 S431 and Fig.13 Same as S441, Fig.14 S452 and Fig.12 S432 and Fig.13 The same as S442, so the detailed description is omitted.

[0215] in addition, Fig.14 Can include Fig.12 S433 and Fig.13 S443, S453 and Fig.12 The same as S433, S454 can be Fig.13 Same as S443.

[0216] For example, when there is a section in which the detection signal is not received through the first terminal 351 , the control circuit 350 may determine whether the section in which the detection signal is not received is longer than a preset reference section ( S453 ).

[0217] When the interval in which the detection signal is not received is smaller than the preset reference interval, the control circuit 350 may determine that the first capacitor 331 is normal.

[0218] When the interval in which the detection signal is not received is longer than the preset reference interval, the control circuit 350 may determine whether the number of intervals in which the detection signal is not received is longer than the preset reference number ( S454 ).

[0219] When the number of intervals in which the detection signal is not received is less than a preset reference number of times, the control circuit 350 may determine that the first capacitor 331 is normal.

[0220] When the number of intervals in which the detection signal is not received is greater than a preset reference number of times, the control circuit 350 may determine that an abnormality exists in the first capacitor 331 ( S455 ).

[0221] Reference Fig.15 and Fig.16 , describing a method for optimizing a benchmark interval or a benchmark frequency using the benchmark setting learning model 141.

[0222] Fig.15 A benchmarking learning model according to an embodiment is shown.

[0223] like Fig.15 As shown, the benchmark setting learning model 141 can be stored in Figure 2 The benchmark setting learning model 141 is learned by taking the benchmark interval and the benchmark number as input, and the optimized benchmark interval or benchmark number can be output. Through this repeated learning, the benchmark setting learning model 141 that outputs the best benchmark interval or benchmark number can be constructed and stored in the memory 140.

[0224] The benchmark setting learning model 141 of the embodiment can be constructed using ANN (Artificial Neural Network), ANN (Artificial Neural Network), CNN (Convolution Neural Network), etc., but is not limited thereto.

[0225] Fig.16 It is a sequence diagram for explaining a benchmark setting method using a benchmark setting learning model according to an embodiment.

[0226] Reference Figure 3 and Fig.16 The control circuit 350 can monitor the external conditions when the power supply device 300 is in operation (S461). Here, the external conditions can be the surrounding power conditions.

[0227] Various sensors not shown in the figure are disposed at various locations of the power supply device 300 or the display device to monitor the surrounding power conditions.

[0228] The control circuit 350 can learn the benchmark setting learning model 141 (S462) with a preset benchmark interval, a preset benchmark number and the monitored surrounding power conditions as inputs. The control circuit 350 outputs at least one of the benchmark interval and the benchmark number from the benchmark setting learning model 141 as a learning result (S463), and stores the output benchmark interval or benchmark number in the memory 140 (S464).

[0229] Whenever the surrounding power situation changes, the reference interval or reference number is upgraded through learning by the reference setting learning model 141 , and the upgraded reference interval or reference number may be stored in the memory 140 .

[0230] In this way, whenever the surrounding power situation changes, the reference interval or reference number updated through learning by the reference setting learning model 141 may be stored in the memory 140 .

[0231] Fig.17 It is to explain the use Fig.16 A sequence diagram of a method for determining whether the first capacitor of the power factor compensation unit is abnormal based on the reference set in FIG.

[0232] like Fig.17 As shown, the control circuit 350 obtains whether the detection signal detected by the inductor 332 for power factor compensation is received through the first terminal 351 (S471), and can obtain whether the detection signal is normally received through the first terminal 351 (S472).

[0233] In the case where the detection signal is normally received through the first terminal 351 , the control circuit 350 may determine that the first capacitor 331 is normal ( S473 ).

[0234] When the detection signal is not normally received through the first terminal 351 , the control circuit 350 may determine whether the first capacitor 331 is abnormal by using at least one of the reference interval and the reference number stored in the memory 140 ( S474 ).

[0235] For example, when no detection signal is received, the control circuit 350 obtains whether the interval in which the detection signal is not received is above the reference interval stored in the memory 140. When the interval in which the detection signal is not received is above the reference interval stored in the memory 140, it can be determined that there is an abnormality in the first capacitor 331.

[0236] For example, when no detection signal is received, the control circuit 350 determines whether the number of repetitions of the interval in which the detection signal is not received is greater than the benchmark number stored in the memory 140. When the number of repetitions of the interval in which no signal is received is greater than the benchmark number stored in the memory 140, it can be determined that an abnormality exists in the first capacitor 331.

[0237] If the power supply and demand situation in the space, surrounding area or country where the display device of the embodiment is installed is unstable, the input voltage Vin input to the rectifier 320 is unstable. Thus, if the input voltage Vin is unstable, even if the first capacitor 331 is normal, there may be an interval where no detection signal is detected.

[0238] Therefore, without considering the surrounding power conditions, even if the first capacitor 331 is normal, it may be mistakenly determined that there is an abnormality in the first capacitor 331 and the operation of the switch 334 may be terminated, which may inadvertently cause poor display operation of the display device.

[0239] In the embodiment, not only the interval in which the detection signal is not detected and the number of repetitions of the interval are considered, but also the surrounding power conditions are considered, and the reference setting learning model 141 is used to learn this information, so that the best reference interval or reference number can be obtained. Thus, by considering the surrounding power conditions, the misjudgment of the abnormality of the first capacitor 331 is prevented, and the best reference interval or reference number is used to more accurately judge whether the first capacitor 331 is abnormal, thereby improving product reliability.

[0240] Industrial Applicability

[0241] The embodiments may be applicable to all electronic devices that use a voltage generated by power factor compensation.

[0242] In particular, the embodiments may be applicable to large-area displays where power consumption is high and power factor compensation is necessary.

Claims

1. A power supply device, comprising: EMI filters; A rectifier unit that rectifies the AC voltage that has passed through the EMI filter; A power factor compensation unit performs power factor compensation on the rectified voltage and outputs a DC voltage; as well as A control circuit controls the power factor compensation unit; The power factor compensation unit comprises: A capacitor connected to the output end of the rectifying unit; an inductor connected in parallel with the capacitor; and a switch connected in parallel with the inductor; The control circuit obtains whether the capacitor is abnormal based on a detection signal detected by the inductor, The switching of the switch is controlled differently depending on whether the capacitor is abnormal.

2. The power supply device according to claim 1, wherein: The control circuit comprises: a first terminal receiving a detection signal detected by the inductor; and The second terminal outputs a first switching control signal or a second switching control signal generated based on the detection signal to the switch.

3. The power supply device according to claim 2, wherein: When the capacitor is normal, the control circuit controls the switching of the switch according to the first switching control signal to charge and discharge energy of the inductor.

4. The power supply device according to claim 3, wherein: The first switching control signal includes a control signal periodically having a first level and a second level different from the first level.

5. The power supply device according to claim 2, wherein: When an abnormality occurs in the capacitor, the control circuit stops the operation of the switch according to the second switching control signal.

6. The power supply device according to claim 5, wherein: The second switching control signal includes a control signal having a constant level.

7. The power supply device according to claim 2, wherein: The control circuit obtains whether a detection signal detected by the inductor is received through the first terminal, When the detection signal is not received and a section in which the detection signal is not received is equal to or longer than a preset reference section, the control circuit determines that an abnormality exists in the capacitor.

8. The power supply device according to claim 7, wherein: When the number of times the detection signal is not received is greater than a preset reference number of times, the control circuit determines that an abnormality exists in the capacitor.

9. The power supply device according to claim 2, wherein: Includes memory for storing the baseline learning model; The control circuit monitors the surrounding power conditions, takes a preset reference interval, a preset reference number, and the monitored surrounding power conditions as input to learn the reference setting learning model, and outputs at least one of the reference interval and the reference number. The outputted reference interval or the reference number of times is stored in the memory.

10. The power supply device according to claim 9, wherein: The control circuit obtains whether a detection signal detected by the inductor is received through the first terminal, In the case where the detection signal is not received, whether the capacitor is abnormal is determined by using at least one of a reference interval and a reference number of times stored in the memory.

11. The power supply device according to claim 1, wherein: The abnormality of the capacitor indicates that the capacitor is open-circuited.

12. A method for operating a power supply device, comprising: A step of rectifying the AC voltage having passed through the EMI filter by a rectifying unit; The step of performing power factor compensation on the rectified voltage by a power factor compensation unit to output a DC voltage; as well as The step of controlling the power factor compensation unit by a control circuit unit; The power factor compensation unit comprises: A capacitor connected to the output end of the rectifying unit; an inductor connected in parallel with the capacitor; and a switch connected in parallel with the inductor; The step of controlling the power factor compensation unit includes: A step of obtaining whether the capacitor is abnormal based on a detection signal detected by the inductor; and The step of controlling the switching of the switch differently according to whether the capacitor is abnormal.

13. The operating method of the power supply device according to claim 12, wherein: The step of controlling the power factor compensation unit includes: receiving a detection signal detected by the inductor through a first terminal of the control circuit unit; and A step of outputting a first switching control signal or a second switching control signal generated based on the detection signal to the switch through a second terminal of the control circuit unit.

14. The operating method of the power supply device according to claim 13, wherein: The step of controlling the power factor compensation unit includes: When the capacitor is normal, the switching of the switch is controlled according to the first switching control signal to charge and discharge energy of the inductor.

15. The operating method of the power supply device according to claim 13, wherein: The step of controlling the power factor compensation unit includes: The step of stopping the operation of the switch according to the second switching control signal when an abnormality exists in the capacitor.

16. The operating method of the power supply device according to claim 13, wherein: The step of controlling the power factor compensation unit includes: a step of obtaining whether a detection signal detected by the inductor is received through the first terminal; and The step of determining that an abnormality exists in the capacitor when the detection signal is not received and when a section in which the detection signal is not received is longer than a preset reference section.

17. The operating method of the power supply device according to claim 13, wherein: The step of controlling the power factor compensation unit includes: a step of obtaining whether a detection signal detected by the inductor is received through the first terminal; and The step of determining that an abnormality exists in the capacitor when the number of times the detection signal is not received is greater than a preset reference number of times.

18. The operating method of the power supply device according to claim 13, wherein: The step of controlling the power factor compensation unit includes: Steps to monitor surrounding power conditions; A step of learning the reference setting learning model using a preset reference interval, a preset reference number, and the monitored surrounding power conditions as inputs, and outputting at least one of a reference interval and a reference number; and The step of storing the outputted reference interval or the reference number of times in a memory.

19. The operating method of the power supply device according to claim 18, wherein: The step of controlling the power factor compensation unit includes: a step of obtaining whether a detection signal detected by the inductor is received through the first terminal; and In the case where the detection signal is not received, the step of obtaining whether the capacitor is abnormal by using at least one of a reference interval and a reference number of times stored in the memory.

20. A display device, comprising: Power supply device; as well as a display, utilizing the power of the power supply device to display an image; The power supply device comprises: EMI filters; A rectifier unit that rectifies the AC voltage that has passed through the EMI filter; a power factor compensation unit, which performs power factor compensation on the rectified voltage and outputs a DC voltage; and a control circuit, which controls the power factor compensation unit; The power factor compensation unit comprises: A capacitor connected to the output end of the rectifying unit; an inductor connected in parallel with the capacitor; and a switch connected in parallel with the inductor; The control circuit determines whether the capacitor is abnormal based on a detection signal detected by the inductor, and controls switching of the switch differently depending on whether the capacitor is abnormal.

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