Power supply circuit, chip and electronic device

Abstract

This utility model relates to the field of electronic technology, and in particular to a power supply circuit, chip, and electronic device. The power supply circuit includes a rectifier circuit, a DC-DC converter circuit, a power management chip, and multiple voltage conversion circuits. The first output terminal of the rectifier circuit is electrically connected to the power supply terminal of the LED backlight module and the input terminal of the DC-DC converter circuit, respectively. The output terminal of the DC-DC converter circuit is electrically connected to the power management chip. The second output terminal of the rectifier circuit is electrically connected to the power supply terminal of the audio unit and the power management chip, respectively. The power management chip is electrically connected to the LCD display module. The rectifier circuit outputs two voltages, and then the DC-DC converter circuit processes the first voltage to power the power management chip. The second voltage output by the rectifier circuit directly powers the audio unit and the power management chip. Compared with existing circuit structures, this power supply circuit structure is simpler and has lower hardware costs.

Description

Technical Field

[0001] This utility model relates to the field of electronic technology, and in particular to a power supply circuit, chip, and electronic device. Background Technology

[0002] Among related technologies, Mini-LED TVs hold a certain share in the high-end TV market due to their superior picture quality and long lifespan. However, because Mini-LED TVs generally have high power consumption and require multiple power supplies, related technologies employ power circuits composed of multiple power factor correction chips and half-bridge resonant circuits to supply power to the mainboard, audio unit, LED backlight module, and LCD display module. This results in a complex power circuit structure and high hardware costs for Mini-LED TVs currently on the market. Utility Model Content

[0003] This invention provides a power supply circuit, a chip, and an electronic device to solve the technical problem of high hardware cost in power supply circuits for Mini-LED TVs in related technologies.

[0004] In a first aspect, this utility model provides a power supply circuit for use in an LED TV, the LED TV including an LED backlight module, an LCD display module, an audio unit and a circuit board, characterized in that the power supply circuit includes: a rectifier circuit, a DC-DC converter circuit and a power management chip.

[0005] The input terminal of the rectifier circuit is used to receive mains power. The first output terminal of the rectifier circuit is electrically connected to the power supply terminal of the LED backlight module and the input terminal of the DC-DC converter circuit. The output terminal of the DC-DC converter circuit is electrically connected to the first input terminal of the power management chip. The second output terminal of the rectifier circuit is electrically connected to the power supply terminal of the audio unit and the power supply terminal of the power management chip. The power management chip is electrically connected to the LCD display module.

[0006] The rectifier circuit is used to rectify the input mains power to obtain a first voltage and a second voltage; the first output terminal and the second output terminal of the rectifier circuit are used to output the first voltage and the second voltage, respectively; the DC-DC converter circuit is used to step down the first voltage to obtain a third voltage; the multiple voltage conversion circuits are used to convert the third voltage to obtain multiple power supply voltages.

[0007] The power management chip is used to perform voltage conversion processing on the multiple input power supply voltages to obtain multiple adapted voltages for output to the LCD display module.

[0008] In one possible design, the power supply circuit includes a first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit; the power supply circuit also includes a motherboard, the input terminals of the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are all electrically connected to the output terminal of the DC-DC conversion circuit, and the output terminals of the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are respectively electrically connected to the corresponding power supply terminals on the motherboard;

[0009] The first voltage conversion circuit is used to step down the third voltage to obtain a fourth voltage; the second voltage conversion circuit is used to step down the third voltage to obtain a fifth voltage; and the third voltage conversion circuit is used to step down the third voltage to obtain a sixth voltage.

[0010] The fifth voltage is less than the fourth voltage, and the sixth voltage is less than the fifth voltage.

[0011] In one possible design, the power management chip further includes a transistor, a Zener diode, and a first inductor;

[0012] The first terminal of the transistor is connected to the second output terminal of the rectifier circuit, the second terminal of the transistor is connected to the first terminal of the first inductor, and the control terminal of the transistor is connected to the power management chip; the second terminal of the first inductor is electrically connected to the first power supply terminal of the LCD display module; the negative terminal of the Zener diode is connected to the second terminal of the transistor, and the positive terminal of the Zener diode is connected to the power management chip.

[0013] In one possible design, the power management chip includes a first buck circuit, the input of which is connected to the output of the DC-DC converter circuit, and the output of which is connected to the second power supply terminal of the LCD display module. The first buck circuit is used to step down the third voltage output by the DC-DC converter circuit to obtain a seventh voltage, which is then output to the LCD display module.

[0014] In one possible design, the power management chip further includes a fourth voltage conversion circuit, the input of which is also connected to the output of the DC-DC conversion circuit, and the output of which is connected to the third power supply terminal of the LCD display module. The fourth voltage conversion circuit is used to step down the third voltage output by the DC-DC conversion circuit to obtain an eighth voltage and output it to the LCD display module.

[0015] In one possible design, the first voltage is 24V, the second voltage is 20V, and the third voltage is 12V.

[0016] In one possible design, the first voltage is 24V, the second voltage is 20V, and the third voltage is 5V.

[0017] In one possible design, the fourth voltage is 3.3V, the fifth voltage is 1.8V, and the sixth voltage is 1.2V.

[0018] Secondly, the present invention provides a chip that includes a power supply circuit as described in any of the preceding claims.

[0019] Thirdly, this utility model provides an electronic device, which includes a power supply circuit as described in any of the preceding claims.

[0020] The power supply circuit provided in the first aspect above includes a rectifier circuit, a DC-DC converter circuit, and a power management chip. The input terminal of the rectifier circuit receives mains power. The first output terminal of the rectifier circuit is electrically connected to the power supply terminal of the LED backlight module and the input terminal of the DC-DC converter circuit. The output terminal of the DC-DC converter circuit is electrically connected to the first input terminal of the power management chip. The second output terminal of the rectifier circuit is electrically connected to the power supply terminal of the audio unit and the power supply terminal of the power management chip. The power management chip is electrically connected to the LCD display module. In this invention, the rectifier circuit rectifies the mains power to output two voltages. Then, the DC-DC converter circuit and multiple voltage conversion circuits process the first voltage to power the power management chip. The second voltage output by the rectifier circuit directly powers the audio unit and the power management chip. Compared with the power supply circuit structure provided in related technologies, the power supply circuit structure provided by this invention is simpler, and the hardware cost of the DC-DC converter circuit and multiple voltage conversion circuits is lower.

[0021] The beneficial effects provided in the second aspect and its various possible designs can be found in the first aspect and its various possible implementations, and will not be repeated here. Attached Figure Description

[0022] Figure 1 One of the schematic diagrams of a power supply circuit architecture for Mini-LED TVs provided for related technologies;

[0023] Figure 2 A second schematic diagram of a power circuit architecture for Mini-LED TVs provided for related technologies;

[0024] ‌ Figure 3One of the circuit structure diagrams of the power supply circuit provided in the embodiment of this utility model;

[0025] Figure 4 A second schematic diagram of the current structure of the power supply circuit provided in an embodiment of this utility model;

[0026] Figure 5 The third schematic diagram of the current structure of the power supply circuit provided in the embodiment of this utility model. Detailed Implementation

[0027] In this invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can represent: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] The terms “center,” “longitudinal,” “lateral,” “up,” “down,” “left,” “right,” “front,” and “back,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] The terms "connected" and "connected" should be interpreted broadly. For example, in circuit structures, "connected" or "connected" can refer not only to physical connections but also to electrical or signal connections. This could be a direct connection (physical connection) or an indirect connection via at least one intermediate component, as long as the circuit is connected. It could also refer to the internal connection between two components. Similarly, a signal connection can refer to a connection via a circuit or a media, such as radio waves. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0030] The transistor in this invention is a three-terminal transistor, with three terminals: a control terminal, a first terminal, and a second terminal. The transistor can be a bipolar transistor (BPT) or a field-effect transistor (FET). For example, when the transistor is a BPT, its control terminal is the base, the first terminal can be the collector or emitter, and the corresponding second terminal can be the emitter or collector. When the transistor is a FET, its control terminal is the gate, the first terminal can be the drain or source, and the corresponding second terminal can be the source or drain.

[0031] In related technologies, the power supply circuit architecture of LED TVs is relatively complex, resulting in a complex hardware circuit structure and requiring a large number of hardware circuit chips, leading to higher hardware costs. Figure 1 One of the power circuit architecture diagrams for Mini-LED TVs provided for related technologies can be found here. Figure 1 As shown, the power supply circuit architecture in the related technology mainly includes a PFC (Power Factor Correction) master control chip 13, a PFC slave control chip 14, a second half-bridge resonant circuit 16, and a third half-bridge resonant circuit 17; the PFC chip is also called a power factor correction chip. The external power supply 11 is electrically connected to the PFC master control chip 13 and the PFC slave control chip 14 respectively. The output terminals of the PFC master control chip 13 and the PFC slave control chip 14 are simultaneously connected to the input terminals of the second half-bridge resonant circuit 16 and the third half-bridge resonant circuit 17. The output terminal of the second half-bridge resonant circuit 16 is electrically connected to the power supply motherboard and the speaker, and the output terminal of the third half-bridge resonant circuit 17 is electrically connected to the LED backlight module. Among them, the PFC master control chip 13 and the PFC slave control chip 14 can be interleaved and connected in parallel. Specifically, the PFC master control chip 13 can be a commercially available chip of model MH2501SC, and the PFC slave control chip 14 can be a commercially available chip of model MH2511SC. The MH2501SC can change the pulse width of the main switch by detecting the output voltage, thereby controlling the output voltage to suit televisions of different power ratings; generally, Figure 1The power supply circuit shown has an output power of over 400W, suitable for powering Mini-LED TVs larger than 75 inches. For example, it's suitable for powering 85-inch and 100-inch Mini-LED TVs. For instance, an external power supply can output 520W of power to a 100-inch Mini-LED TV, or 400W to an 85-inch Mini-LED TV. The second half-bridge resonant circuit 16 outputs a 12V supply voltage to the TV motherboard and simultaneously outputs an 18V supply voltage to the speaker. The third half-bridge resonant circuit 17 outputs a 14V supply voltage and a current of 14A-24A to the LED backlight module.

[0032] Figure 2 Please refer to the second schematic diagram of the power circuit architecture for Mini-LED TVs provided for related technologies. Figure 2 As shown, in Figure 1 Based on this, the power supply in the related technology also includes a digital control chip 12 and a first half-bridge resonant circuit 15. The output terminal of the external power supply 11 is electrically connected to the input terminal of the digital control chip 12. The digital control chip 12 is a combination of a PFC (Power Factor Correction) circuit and a half-bridge resonant circuit. In other words, the digital control chip 12 is a power supply architecture with a PFC+LLC architecture.

[0033] The aforementioned half-bridge resonant circuit is an LLC circuit, short for Inductor-Inductor-Capacitor. Currently, the HR1211 integrates CCMPFC and LLC control, while the HR1275 integrates CrMPFC and LLC control. An LLC circuit is a special type of resonant circuit that achieves constant output voltage by controlling the switching frequency. Figure 2 The power supply circuit shown is typically used in Mini-LED TVs with lower power requirements, generally for powering Mini-LED TVs under 75 inches. For example, an external power supply outputs 200W of power to a 55-inch Mini-LED TV, or 270W to a 65-inch Mini-LED TV, or 330W to a 75-inch Mini-LED TV. The integrated digital control chip 12 outputs a 12V power supply voltage to the TV's mainboard, another 18V power supply voltage to the speaker, and a 380V power supply voltage to the first half-bridge resonant circuit 15. The first half-bridge resonant circuit 15 outputs a 14V power supply voltage and a current of 14A-24A to the LED backlight module. Figure 2As can be seen, the external power supply 11 outputs different power for different sizes of Mini-LED TVs, and supplies power to the Mini-LED TVs through two power supply channels, one above and one below.

[0034] Combination Figure 1 and Figure 2 The provided power supply circuit for Mini-LED TVs shows that the power supply circuits for Mini-LED TVs in related technologies all require two half-bridge resonant circuits (i.e., LLC circuits) to achieve two stable voltage outputs: one stable 12V power supply voltage to the motherboard, and the other stable 14V power supply voltage to the LED backlight module. Due to the relatively complex circuit structure of LLC circuits and the fact that LLC circuit chips are much more expensive than AC-DC circuit chips, the hardware cost of the power supply circuits in related technologies is relatively high.

[0035] To overcome the technical problem of high hardware cost of power supply circuits in the aforementioned related technologies, the power supply circuit for LED TVs provided in this application includes: a rectifier circuit, a DC-DC converter circuit, and a power management chip. The DC-DC converter circuit replaces the function of an LLC circuit or a Flyback circuit. Furthermore, since the power consumption of the power management chip of the LCD display module is changed to be powered through the second output terminal of the rectifier circuit, the power of the DC-DC converter circuit will be very small, thereby achieving the purpose of reducing the hardware cost of the circuit. The rectifier circuit has the following components: its input terminal receives AC power; its first output terminal is electrically connected to the power supply terminal of the LED backlight module and the input terminal of the DC-DC converter circuit; the output terminal of the DC-DC converter circuit is electrically connected to the first input terminal of the power management chip; its second output terminal is electrically connected to the power supply terminal of the audio unit and the power supply terminal of the power management chip; and the power management chip is electrically connected to the LCD display module. The rectifier circuit rectifies the input AC power to obtain a first voltage and a second voltage. Its first and second output terminals output the first and second voltages, respectively. The DC-DC converter circuit steps down the first voltage to obtain a third voltage. Multiple voltage conversion circuits convert the third voltage to obtain multiple power supply voltages to power the motherboard. The power management chip converts the multiple input power supply voltages to obtain multiple compatible voltages for output to the LCD display module.

[0036] ‌ Figure 3 For one of the circuit structure diagrams of the power supply circuit provided in the embodiment of this utility model, please refer to [link / reference]. Figure 3As shown, the power supply circuit provided in this embodiment is applied to an LED TV. Generally, an LED TV mainly includes components such as an LED backlight module 38, an LCD display module 37, an audio unit 36, and a circuit board 39. The power supply circuit for an LED TV provided in this embodiment includes: a rectifier circuit 30, a DC-DC converter circuit 31, a power management chip 32, and multiple voltage conversion circuits.

[0037] The rectifier circuit 30 has an input terminal for receiving mains power, a first output terminal for being electrically connected to the power supply terminal of the LED backlight module 38 and the input terminal of the DC-DC converter circuit 31, and an output terminal for being electrically connected to the first input terminal of the power management chip 32. The second output terminal of the rectifier circuit 30 is electrically connected to the power supply terminal of the audio unit 36 ​​and the power supply terminal of the power management chip 32, and the power management chip 32 is electrically connected to the LCD display module 37. The rectifier circuit 30 receives mains power and rectifies it to obtain a first voltage and a second voltage. In this embodiment, the first and second voltages are direct current (DC). The first output terminal 301 and the second output terminal 302 of the rectifier circuit 30 are used to output the rectified first and second voltages, respectively. The DC-DC converter circuit 31 steps down the first voltage to obtain a third voltage, the value of which is less than the first voltage. Multiple voltage conversion circuits are used to perform voltage conversion on the stepped-down third voltage to obtain multiple power supply voltages of different magnitudes to power the corresponding power supply pins on the motherboard. The rectification process yields a second voltage to power the audio unit 36, and this second voltage is also output to the power management chip 32. The power management chip 32 performs voltage conversion on the multiple input power supply voltages to obtain multiple adapted voltages for output to the LCD display module 37, thereby powering the LCD display module 37.

[0038] As can be seen, in this embodiment, a rectifier circuit 30 outputs two voltages, and then a DC-DC converter circuit 31 and multiple voltage conversion circuits are used to process the first voltage to power the power management chip 32. The second voltage output by the rectifier circuit 30 directly powers the audio unit 36. Compared with the two DC-DC converter circuits in related technologies, the circuit structure is simpler, and the hardware cost of the DC-DC converter circuit 31 and multiple voltage conversion circuits is lower.

[0039] The power supply circuit also includes a motherboard 39. The input terminals of the first voltage conversion circuit 33, the second voltage conversion circuit 34, and the third voltage conversion circuit 35 are all electrically connected to the output terminal of the DC-DC conversion circuit 31. The output terminals of the first voltage conversion circuit 33, the second voltage conversion circuit 34, and the third voltage conversion circuit 35 are respectively electrically connected to the corresponding power supply terminals on the motherboard 39.

[0040] In one embodiment, the rectifier circuit 30 further includes a voltage regulator circuit or a voltage regulator module to regulate the rectified first voltage, thereby ensuring that the voltage output to the DC-DC conversion circuit 31 is more stable and improving the stability of the circuit.

[0041] As can be seen, the rectifier circuit 30 provided in this embodiment outputs two voltage signals, one of which is a stable or stable adjustable first voltage, and the other is an unstable second voltage. The stable or stable adjustable first voltage powers the Mini backlight module and the DC-DC conversion circuit of the LCD, while the second voltage powers the audio unit 36 ​​and the power management chip of the LCD display module. Compared with the rectifier circuit 30 that can output two stable voltages, the rectifier circuit 30 in this embodiment has a lower hardware cost. Furthermore, this embodiment uses the architecture of rectifier circuit 30 and DC-DC conversion circuit 31 to replace the existing LLC+LLC or LLC+Flyback circuit architecture, making the circuit a single-path circuit architecture, which also reduces the hardware cost.

[0042] In one embodiment, the power supply circuit specifically includes a first voltage conversion circuit 33, a second voltage conversion circuit 34, and a third voltage conversion circuit 35. The first voltage conversion circuit 33 is used to step down the third voltage output by the DC-DC converter circuit 31 to obtain a fourth voltage. The second voltage conversion circuit 34 is used to step down the third voltage output by the DC-DC converter circuit 31 to obtain a fifth voltage. The third voltage conversion circuit 35 is used to step down the third voltage output by the DC-DC converter circuit 31 to obtain a sixth voltage. The magnitudes of the fourth, fifth, and sixth voltages can be the same or different; alternatively, two of the fourth, fifth, and sixth voltages can be the same.

[0043] In one embodiment, the fifth voltage is lower than the fourth voltage, and the sixth voltage is lower than the fifth voltage. For example, the fourth voltage is 3.3V, the fifth voltage is 1.8V, and the sixth voltage is 1.2V. For instance, in a specific embodiment, the third voltage output by the DC-DC converter circuit 31 is 12V, and this third voltage is directly output to the corresponding power supply pin on the power management chip 32. Then, the first voltage conversion circuit 33 steps down the 12V voltage output by the DC-DC converter circuit 31 to 3.3V, the second voltage conversion circuit 34 steps down the 12V voltage output by the DC-DC converter circuit 31 to 1.8V, and the third voltage conversion circuit 35 steps down the 12V voltage output by the DC-DC converter circuit 31 to 1.2V.

[0044] In some embodiments, the second voltage can be 20V, and the second output terminal 302 of the rectifier circuit 30 is also electrically connected to the power management chip 32 to supply power to the power management chip 32.

[0045] In one embodiment, the power management chip 32 further includes a transistor Q1, a Zener diode D1, and a first inductor L1; the first terminal of transistor Q1 is electrically connected to the second output terminal 302 of the rectifier circuit 30, the second terminal of transistor Q1 is connected to the first terminal of the first inductor L1, and the control terminal of transistor Q1 is electrically connected to the switch control pin on the power management chip 32; the second terminal of the first inductor L1 is electrically connected to the first power supply terminal 374 of the LCD display module 37 to supply power to the LCD display module 37; the cathode of the Zener diode D1 is connected to the second terminal of transistor Q1, and the anode of the Zener diode D1 is connected to the power management chip 32.

[0046] It is understood that, in one embodiment, transistor Q1, Zener diode D1, and first inductor L1 may also be integrated inside power management chip 32.

[0047] Specifically, in one embodiment, transistor Q1 can be a PMOS (P-Metal-Oxide-Semiconductor) transistor. For example, when transistor Q1 is a PMOS transistor, its first electrode is the drain, its second electrode is the source, and its control electrode is the gate. The switch control pin on the power management chip 32 is electrically connected to the gate of transistor Q1. The power management chip 32 can output control commands to control the conduction or cutoff of transistor Q1, thereby controlling the power supply to the first power supply terminal 374 of the LCD display module 37. For example, the power management chip 32 can output a low-level signal to control transistor Q1 to conduct, or the power management chip 32 can output a high-level signal to control transistor Q1 to cut off. For example, when the Mini-LED TV is turned off, the power management chip 32 can output a high-level signal to control transistor Q1 to cut off, thereby controlling the power supply to the first power supply terminal 374 of the LCD display module 37 to be disconnected.

[0048] Among them, the Zener diode D1 plays the role of stabilizing the second voltage to ensure that the power supply voltage output to the first power supply terminal 374 of the LCD display module 37 is stable; the first inductor L1 plays the role of filtering the second voltage, which can also ensure that the power supply voltage output to the first power supply terminal 374 of the LCD display module 37 is more stable.

[0049] As can be seen, by using the power supply provided in this embodiment, the second voltage output by the rectifier circuit 30 is directly supplied to the audio unit 36. At the same time, after being regulated and filtered by the power management chip 32, the power is directly supplied to the LCD display module 37. Compared with the circuits provided by related technologies, this saves an LLC circuit and further reduces the hardware cost of the circuit.

[0050] It is understandable that the first power supply terminal 374 of the LCD display module 37 is a high-voltage power supply terminal, and the second terminal of the rectifier circuit 30 can directly output a 20V voltage to achieve high-voltage power supply to the LCD display module 37.

[0051] In one embodiment, the power management chip includes a first step-down circuit, the input of which is connected to the output of the DC-DC converter circuit 31, and the output of which is connected to the second power supply terminal 373 of the LCD display module 37. The first step-down circuit is used to step down the third voltage output by the DC-DC converter circuit 31 to obtain a seventh voltage and output it to the LCD display module 37 to power the LCD display module 37.

[0052] In one embodiment, the power management chip further includes a fourth voltage conversion circuit. The input terminal of the fourth voltage conversion circuit is also connected to the output terminal of the DC-DC conversion circuit 31, and the output terminal of the fourth voltage conversion circuit is connected to the third power supply terminal 372 of the LCD display module 37. The fourth voltage conversion circuit is used to step down the third voltage output by the DC-DC conversion circuit 31 to obtain an eighth voltage and output it to the LCD display module 37. Generally, the eighth voltage is less than the third voltage, that is, the eighth voltage is less than 13V.

[0053] In one embodiment, the power management chip further includes a fifth voltage conversion circuit. The input terminal of the fifth voltage conversion circuit is also connected to the output terminal of the DC-DC conversion circuit 31, and the output terminal of the fifth voltage conversion circuit is connected to the fourth power supply terminal 371 of the LCD display module 37. The fifth voltage conversion circuit is used to step down the third voltage output by the DC-DC conversion circuit 31 to obtain a ninth voltage and output it to the LCD display module 37. Generally, the ninth voltage is less than the third voltage, that is, the ninth voltage is less than 13V.

[0054] Generally, the seventh, eighth, and ninth voltages input to the LCD display module 37 are between 1 and 4V to meet the power supply requirements of the LCD display module 37.

[0055] Please continue reading Figure 3 As shown, in one embodiment, the first voltage output by the rectifier circuit 30 in the power supply circuit is 26V, the second voltage is 20V, and the third voltage output by the DC-DC conversion circuit 31 is 13V.

[0056] Figure 4 For the second schematic diagram of the current structure of the power supply circuit provided in this embodiment of the utility model, please refer to [the diagram]. Figure 4 As shown, in another embodiment, the first voltage output by the rectifier circuit 30 in the power supply circuit is 24V, the second voltage is 20V, and the third voltage output by the DC-DC conversion circuit 31 is 5V.

[0057] In one embodiment, the DC-DC conversion circuit 31 in the power supply circuit can specifically be a BUCK (Buck Converter) circuit 40 or a charge pump circuit to step down the first voltage output by the rectifier circuit 30. Since the BUCK circuit 40 is specifically one type of DC-DC conversion circuit 31, it will not be described in detail here.

[0058] Specifically, in this embodiment, a charge pump circuit is added to the motherboard to replace the LLC+LLC or LLC+Flyback circuit architecture in related technologies. Since the cost of the charge pump circuit or the BUCK circuit is low (less than one yuan), while the cost of the existing rectifier current is about 3-5 yuan, the cost of the existing rectifier circuit is reduced. This changes the original LLC+LLC or LLC+Flyback circuit architecture to a single-circuit architecture, which is simpler in structure and has lower circuit hardware cost.

[0059] In one embodiment, the power management chip 32 is also provided with one or more USB terminals to supply power to the USB interface on the TV; the USB interface on the TV can be used to connect peripherals, such as game controllers, USB flash drives, etc., to suit different application scenarios.

[0060] Figure 5 For the third schematic diagram of the current structure of the power supply circuit provided in this embodiment of the utility model, please refer to [the diagram]. Figure 5 As shown, in one embodiment, the rectifier circuit 30 further includes a third output terminal 303, which is electrically connected to a power supply pin on the power management chip 32. The third output terminal 303 is used to output a 9V power supply voltage to the power management chip 32 to power it; and this 9V power supply voltage is uncontrollable, meaning it does not require voltage regulation. This is consistent with... Figure 3 Compared to the circuit shown, the DC-DC conversion circuit 31 is omitted, further saving hardware costs.

[0061] In televisions, the main functions of the power management integrated circuit (PMIC) 32 include voltage conversion, dynamic regulation, and protection mechanisms to ensure stable and reliable power management for electronic devices. The PMIC identifies the CPU power supply amplitude, generates corresponding short-wave pulses, and drives subsequent circuits to output power, thereby providing stable and reliable power management for electronic devices.

[0062] In one embodiment, the power management chip 32 can convert the input voltage and current into power suitable for loads such as microprocessors and sensors, ensuring the normal operation of the device. Alternatively, it can dynamically adjust the power supply strategy according to the device load, such as reducing power consumption during standby to extend battery life; and providing overvoltage and overcurrent protection to prevent the device from being damaged due to abnormal voltage or current.

[0063] In Mini-LED TVs, the power management chip 32 is primarily used in the TCON (Timing Controller Board) display panel. The TCON board is a key component in LCD TVs, responsible for controlling the timing of the LCD panel and converting input video signals into data signals that the LCD panel can recognize. The PMIC's role in the TCON display panel includes automatically detecting and adjusting voltage, such as improving color and resolution performance, ensuring stable and efficient screen operation, and optimizing energy consumption. The power management chip 32 also features high integration; for example, the iML1942 chip has a complete I2C interface for programming various parameters, including current-mode boost regulators, synchronous boost converters, and negative charge pump regulators, to meet different voltage and current requirements. In some embodiments, the power management chip 32 primarily powers the LCD display module 37, or it can power the T-con section.

[0064] This utility model embodiment also provides a chip, which includes a power supply circuit as provided in any of the above embodiments; it is understood that the chip can specifically be a power supply chip for electronic devices, which has the same technical effect as the power supply circuit described above, and has a lower hardware cost. Its function and implementation method can be referred to the above embodiments, and will not be repeated here.

[0065] This utility model embodiment also provides an electronic device, which includes a power supply circuit as provided in any of the above embodiments. It is understood that the electronic device can be a Mini-LED TV or an LED TV, etc. Furthermore, the electronic device can also be other electronic devices that utilize the above-described power supply. By employing the power supply circuits provided in the above embodiments, the hardware cost can be reduced. Its functions and implementation methods can be found in the above embodiments and will not be repeated here.

[0066] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A power supply circuit, applied in an LED television, the LED television comprising an LED backlight module, an LCD display module, an audio unit, and a circuit board, characterized in that, The power supply circuit includes: a rectifier circuit, a DC-DC converter circuit, and a power management chip; The input terminal of the rectifier circuit is used to receive mains power. The first output terminal of the rectifier circuit is electrically connected to the power supply terminal of the LED backlight module and the input terminal of the DC-DC converter circuit. The output terminal of the DC-DC converter circuit is electrically connected to the first input terminal of the power management chip. The second output terminal of the rectifier circuit is electrically connected to the power supply terminal of the audio unit and the power supply terminal of the power management chip. The power management chip is electrically connected to the LCD display module. The rectifier circuit is used to rectify the input mains power to obtain a first voltage and a second voltage; the first output terminal and the second output terminal of the rectifier circuit are used to output the first voltage and the second voltage, respectively; the DC-DC converter circuit is used to step down the first voltage to obtain a third voltage. The power management chip is used to perform voltage conversion processing on the multiple input power supply voltages to obtain multiple adapted voltages for output to the LCD display module.

2. The power supply circuit according to claim 1, characterized in that, The power supply circuit includes a first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit; the power supply circuit also includes a motherboard, the input terminals of the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are all electrically connected to the output terminal of the DC-DC conversion circuit, and the output terminals of the first voltage conversion circuit, the second voltage conversion circuit, and the third voltage conversion circuit are respectively electrically connected to the corresponding power supply terminals on the motherboard; The first voltage conversion circuit is used to step down the third voltage to obtain a fourth voltage; the second voltage conversion circuit is used to step down the third voltage to obtain a fifth voltage; and the third voltage conversion circuit is used to step down the third voltage to obtain a sixth voltage. The fifth voltage is less than the fourth voltage, and the sixth voltage is less than the fifth voltage.

3. The power supply circuit according to claim 2, characterized in that, The power management chip also includes a transistor, a Zener diode, and a first inductor; The first terminal of the transistor is connected to the second output terminal of the rectifier circuit, the second terminal of the transistor is connected to the first terminal of the first inductor, and the control terminal of the transistor is connected to the power management chip; the second terminal of the first inductor is electrically connected to the first power supply terminal of the LCD display module; the negative terminal of the Zener diode is connected to the second terminal of the transistor, and the positive terminal of the Zener diode is connected to the power management chip.

4. The power supply circuit according to claim 3, characterized in that, The power management chip includes a first step-down circuit, the input of which is connected to the output of the DC-DC converter circuit, and the output of which is connected to the second power supply terminal of the LCD display module. The first step-down circuit is used to step down the third voltage output by the DC-DC converter circuit to obtain a seventh voltage and output it to the LCD display module.

5. The power supply circuit according to claim 4, characterized in that, The power management chip also includes a fourth voltage conversion circuit. The input terminal of the fourth voltage conversion circuit is also connected to the output terminal of the DC-DC conversion circuit. The output terminal of the fourth voltage conversion circuit is connected to the third power supply terminal of the LCD display module. The fourth voltage conversion circuit is used to step down the third voltage output by the DC-DC conversion circuit to obtain an eighth voltage and output it to the LCD display module.

6. The power supply circuit according to claim 3, characterized in that, The DC-DC conversion circuit is either a charge pump circuit or a BUCK circuit.

7. The power supply circuit according to claim 3, characterized in that, The first voltage is 24V, the second voltage is 20V, and the third voltage is 12V; Alternatively, the first voltage is 24V, the second voltage is 20V, and the third voltage is 5V.

8. The power supply circuit according to claim 3, characterized in that, The fourth voltage is 3.3V, the fifth voltage is 1.8V, and the sixth voltage is 1.2V.

9. A chip, characterized in that, The chip includes a power supply circuit as described in any one of claims 1-8.

10. An electronic device, characterized in that, The electronic device includes a power supply circuit as described in any one of claims 1-8.

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