Power supply system and electronic device

Abstract

Embodiments of the present application provide a power supply system and an electronic device, and relate to the technical field of automatic detection of power failure. The power supply system comprises a first voltage detection module and a second voltage detection module. The input voltage of the first voltage detection module is a first voltage, and the input voltage of the second voltage detection module is a second voltage, which is less than the first voltage. The first voltage detection module is configured to detect the power supply state of an alternating current power supply when the electronic device is in a first working state, and the second voltage detection module is configured to detect the power supply state of the alternating current power supply when the electronic device is in a second working state. The power of the electronic device in the second working state is less than the power of the electronic device in the first working state. In the embodiments of the present application, the first voltage detection module and the second voltage detection module can be matched with the working state of the electronic device, so as to realize power failure detection with fast response speed and low power.

Description

Technical Field

[0001] Embodiments of this application provide a power supply system and electronic device, relating to the technical field of automatic power failure detection. Background Technology

[0002] Electronic devices typically include a power supply system. An AC power source (such as AC mains power) is coupled to the power supply system. The power supply system processes the AC power through AC-DC conversion and step-down conversion before supplying power to the chips and other components of the electronic device.

[0003] When the mains power fails, the chip is usually unable to obtain the power failure information in a timely manner, which affects the reliability of the chip and its memory. Summary of the Invention

[0004] Embodiments of this application provide a power supply system and electronic device for automatically detecting AC power failure.

[0005] On one hand, embodiments of this application provide a power supply system. The power supply system includes a first voltage detection module and a second voltage detection module. The input voltage of the first voltage detection module is a first voltage, and the input voltage of the second voltage detection module is a second voltage, where the second voltage is less than the first voltage. The first voltage detection module is used to: detect the power supply status of the AC power source when the electronic device is in a first operating state, and output a first power-down signal when the AC power source is in a power-off state. The second voltage detection module is used to: detect the power supply status of the AC power source when the electronic device is in a second operating state, and output a second power-down signal when the AC power source is in a power-off state. The power consumption of the electronic device in the second operating state is less than the power consumption of the electronic device in the first operating state.

[0006] Understandably, the first voltage detection module can be coupled to a higher voltage location, and the second voltage detection module can be coupled to a lower voltage location, so that the second voltage is lower than the first voltage. Because the second voltage is lower than the first voltage, the power consumption of the second voltage detection module is lower than that of the first voltage detection module.

[0007] When the AC power supply fails, the voltage at higher voltage levels drops first. After the voltage at higher voltage levels drops to a certain value, the voltage at lower voltage levels begins to drop. Therefore, when the electronic device is in its first operating state, the first voltage detection module operates. The first voltage detection module can determine the AC power supply status based on the first voltage, enabling it to quickly obtain the AC power supply status and shortening the time required for the first voltage detection module to identify the AC power failure. This provides sufficient time for the processor to execute the power-down sequence, meeting the processor's requirements for executing the power-down sequence.

[0008] When the electronic device is in its first operating state, the second voltage detection module can operate, eliminating the need for a switch structure to turn the second voltage detection module off and simplifying the power supply system structure. Alternatively, the second voltage detection module can also be deactivated, which reduces power consumption when the electronic device is in its first operating state.

[0009] When the electronic device is in the second operating state, the first voltage detection module stops working and the second voltage detection module works, which can reduce the power consumption of the electronic device in the second operating state, thus helping to achieve low power consumption of the electronic device in the second operating state. This ensures that the power of the electronic device in the second operating state is less than or equal to 0.5W, meeting the standby energy efficiency requirements of the electronic device.

[0010] Furthermore, when the electronic device is in its second operating state, the second voltage detection module can determine the AC power supply status based on the second voltage, enabling the processor to obtain power-down information. Understandably, when the electronic device is in its second operating state, the operating power is relatively low, and the time from the second detection module issuing the second power-down signal to the processor ceasing normal operation is greater than 100ms, meeting the processor's power-down timing requirements.

[0011] In other words, the embodiments of this application configure the power supply system to include a first voltage detection module and a second voltage detection module. When the electronic device is in a high power consumption state, the first voltage detection module determines the AC power supply state based on a first voltage; when the electronic device is in a low power consumption state, the second voltage detection module determines the AC power supply state based on a second voltage. This allows the first and second voltage detection modules to match the two different operating states of the electronic device, automatically detecting the AC power supply state in both high and low power consumption scenarios, and simultaneously meeting the timeliness and power consumption requirements for power failure detection.

[0012] In some possible implementations, the power supply system also includes a logic module. When the electronic device is in a first operating state, the logic module receives a first power-down signal and outputs a third power-down signal based on the first power-down signal. When the electronic device is in a second operating state, the logic module receives a second power-down signal and outputs a third power-down signal based on the second power-down signal. Understandably, by setting up the logic module, the first voltage detection module and the second voltage detection module do not need to be coupled to the processor separately, thereby eliminating the need for the processor to poll the output signals of the first and second voltage detection modules, simplifying the processor's control logic and saving processor resources.

[0013] In some possible implementations, the electronic device includes a processor that executes a power-down sequence based on a third power-down signal. This configuration simplifies the processor's control logic, allowing the processor to seamlessly identify the first power-down signal from the first detection module and the second power-down signal from the second detection module via the third power-down signal, thus conserving processor resources. Furthermore, it eliminates the need for additional logic gates between the logic modules and the processor, simplifying the power supply system structure.

[0014] In some possible implementations, when the electronic device is in its second operating state, the processor outputs a standby signal to the first voltage detection module, which then stops operating based on the standby signal. This configuration reduces the energy consumption of the electronic device in its second operating state and allows the first voltage detection module to automatically stop operating, enabling adaptive switching between the first and second voltage detection modules under different operating scenarios without manual user intervention, thus improving the ease of use of the power supply system.

[0015] In some possible implementations, the processor includes a first processor and a second processor. A logic module is used to send a third power-down signal to both the first and second processors. One of the first and second processors executes a power-down sequence based on the third power-down signal. Understandably, the logic module's sending of the third power-down signal ensures that both the first and second processors can receive the signal. The execution of the power-down sequence based on the third power-down signal by one of the first and second processors avoids the risk of duplicate or conflicting execution of the power-down sequence.

[0016] In some possible implementations, when the electronic device is in a second operating state, one of the first and second processors sends a standby signal to the first voltage detection module. This configuration avoids the risk of repeatedly sending the standby signal.

[0017] In some possible implementations, the first processor includes a video chip; or, the first processor includes both a video chip and a microcontroller unit. The second processor includes an artificial intelligence chip. This configuration enables the electronic device to have display functionality and AI interaction capabilities, meeting diverse usage needs.

[0018] In some possible implementations, the first voltage detection module includes a first comparison unit and an auxiliary power supply. When the electronic device is in a first operating state, the first comparison unit compares a first voltage with a first reference voltage. If the first voltage is less than the first reference voltage, the first comparison unit determines that the AC power supply is down. The auxiliary power supply powers the first comparison unit. When the electronic device is in a second operating state, the processor sends a standby signal to the auxiliary power supply, and the auxiliary power supply stops supplying power based on the standby signal. Understandably, the first comparison unit can compare the first voltage with the first reference voltage to determine whether the AC power supply is down when the electronic device is in the first operating state. This logic is simple, requires no complex circuit structure, and reduces the cost of the power supply system. Furthermore, when the electronic device is in the second operating state, the processor controls the first auxiliary power supply to stop supplying power to the first comparison unit, reducing the energy consumption of the electronic device in the second operating state and facilitating low power consumption in the second operating state (e.g., standby state).

[0019] In some possible implementations, the first voltage detection module further includes an output unit. The output unit is used to acquire the comparison result of the first comparison unit and output a first power-down signal when the first comparison unit determines that the AC power supply is in a power-down state. Understandably, by adjusting the output unit, the first voltage detection module can output different types of first power-down signals (e.g., optical signals or electrical signals) to meet different needs.

[0020] In some possible implementations, the logic module includes a switching transistor. When the switching transistor receives a first power-down signal or a second power-down signal, it turns on, and the processor receives a third power-down signal. This configuration simplifies the structure of the logic module and facilitates the miniaturization of the power supply system.

[0021] In some possible implementations, the second voltage detection module includes a second comparison unit. When the electronic device is in a first operating state, the second comparison unit compares a second voltage with a second reference voltage. If the second voltage is less than the second reference voltage, the second comparison unit determines that the AC power supply has failed and outputs a second power failure signal. This configuration allows the second comparison unit to compare the second voltage with the second reference voltage when the electronic device is in a second operating state, thereby determining whether the AC power supply has failed. The logic is simple, requiring no complex circuit structure, thus reducing the cost of the power supply system.

[0022] In some possible implementations, the power supply system also includes an AC-DC conversion module and a buck module, which are coupled together. The first voltage is the input voltage of the AC-DC conversion module; or, the first voltage is the output voltage of the AC-DC conversion module. The second voltage is the output voltage of the buck module. Understandably, setting the first voltage as either the input or output voltage of the AC-DC conversion module allows the first voltage detection module to be coupled to either the input or output terminal of the AC-DC conversion module. This improves the flexibility of the first voltage detection module's configuration and allows it to be coupled to a higher voltage location. This enables the first voltage detection module to quickly obtain the AC power supply status, shortening the time required for it to identify AC power failure, and providing sufficient time for the processor to execute the power-down sequence, thus meeting the processor's power-down sequence requirements. The second voltage is set to the output voltage of the step-down module, so that the second voltage detection module can be coupled to the output terminal of the step-down module. This allows the second voltage detection module to be coupled at a relatively low voltage position, reducing the power consumption of the electronic device in the second operating state. This facilitates the achievement of low power consumption in the second operating state, ensuring that the power of the electronic device in the second operating state is less than or equal to 0.5W, thus meeting the standby energy efficiency requirements of the electronic device.

[0023] In some possible implementations, the power supply system also includes a first energy storage capacitor and a second energy storage capacitor. The first energy storage capacitor is coupled between the AC-DC conversion module and the buck module, and the second energy storage capacitor is coupled to the output terminal of the buck module. Understandably, when the AC power supply is not interrupted, the first and second energy storage capacitors can store energy. When the AC power supply is interrupted, the first and second energy storage capacitors can discharge to power the processor, meeting the processor's power-down timing requirements.

[0024] In some possible implementations, the first energy storage capacitor has a capacitance of 200 microfarads, and the second energy storage capacitor has a capacitance of 2000 microfarads. This configuration ensures that the first and second energy storage capacitors provide sufficient energy to the processor after an AC power outage, reducing the risk of processor power failure before the power-down sequence is completed. Furthermore, it reduces the energy consumption of the first and second energy storage capacitors when the electronic device is in a second operating state, ensuring that the power consumption of the electronic device in the second operating state is less than or equal to 0.5W, thus meeting the standby energy efficiency requirements of the electronic device.

[0025] In some possible implementations, the first operating state is the normal operating state, and the second operating state is the standby state. This configuration ensures that the power consumption of the electronic device in the second operating state is less than the power consumption of the electronic device in the first operating state.

[0026] In another aspect, embodiments of this application provide an electronic device. The electronic device includes a power supply system and a processor as described above, with the power supply system coupled to the processor.

[0027] The electronic devices provided in the embodiments of this application include the power supply system as described above, and therefore have all the aforementioned beneficial effects, which will not be repeated here. Attached Figure Description

[0028] Figure 1 Schematic block diagrams of the structure of electronic devices provided in some embodiments of this application;

[0029] Figure 2 Schematic block diagrams of the structure of electronic devices provided in other embodiments of this application;

[0030] Figure 3 Schematic block diagrams of the structure of an electronic device provided in some embodiments of this application;

[0031] Figure 4 Schematic block diagrams of the structure of an electronic device provided in some embodiments of this application;

[0032] Figure 5 Schematic block diagrams of the structure of an electronic device provided in some embodiments of this application;

[0033] Figure 6 Schematic block diagrams of the structure of an electronic device provided in some embodiments of this application;

[0034] Figure 7 Schematic block diagrams of the structure of an electronic device provided in some embodiments of this application;

[0035] Figure 8 Schematic block diagrams of the structure of an electronic device provided in some embodiments of this application;

[0036] Figure 9 Schematic block diagrams of the structure of an electronic device provided in some embodiments of this application;

[0037] Figure 10 A schematic diagram of the voltage curve after AC power failure in the first operating state provided for some embodiments of this application;

[0038] Figure 11 This application provides a schematic diagram of the voltage curve after AC power failure in the second operating state, as shown in some embodiments of the present application.

[0039] Figure 12 A schematic block diagram showing the connection of logic modules, video chips, and artificial intelligence chips provided in some embodiments of this application;

[0040] Figure 13A schematic block diagram showing the connection of logic modules, video chips, artificial intelligence chips, and microcontrollers provided in some embodiments of this application;

[0041] Figure 14 Schematic block diagrams of the structure of an electronic device provided in some embodiments of this application;

[0042] Figure 15 A schematic diagram of the circuit topology of an electronic device provided in some embodiments of this application;

[0043] Figure 16 A schematic diagram of the circuit topology of a first voltage detection module provided in some embodiments of this application;

[0044] Figure 17 Circuit topology diagrams of electronic devices provided in other embodiments of this application;

[0045] Figure 18 This is a schematic block diagram of the structure of an electronic device provided in some embodiments of this application. Detailed Implementation

[0046] The technical solutions in some embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application are within the protection scope of this application.

[0047] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this application. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific feature, structure, material, or characteristic may be included in any suitable manner in any one or more embodiments or examples.

[0048] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0049] "At least one of A, B and C" has the same meaning as "at least one of A, B or C", both including the following combinations of A, B and C: only A, only B, only C, combinations of A and B, combinations of A and C, combinations of B and C, and combinations of A, B and C.

[0050] As used herein, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0051] In describing some embodiments, the terms "coupled" and "connected" and their derivative expressions may be used. The terms "coupled" and "connected" are used, for example, to indicate that two or more components have direct physical or electrical contact.

[0052] Figure 1 This is a schematic block diagram of the structure of an electronic device provided in some embodiments of this application. Figure 2 Schematic block diagrams illustrating the structure of electronic devices provided in other embodiments of this application. For example... Figure 1 and Figure 2 As shown, an embodiment of this application provides an electronic device 200. For example, the electronic device 200 can be a smart screen, an electronic whiteboard, or a television, etc. The embodiments of this application do not further limit the specific form of the electronic device 200.

[0053] In some examples, such as Figure 1 and Figure 2 As shown, the electronic device 200 may include a first circuit board 202, a second circuit board 203, a third circuit board 204, and a housing 205. The first circuit board 202, the second circuit board 203, and the third circuit board 204 may be at least one of a printed circuit board (PCB), a flexible printed circuit board (FPC), and a rigid flex printed circuit board (FPCB). The first circuit board 202, the second circuit board 203, and the third circuit board 204 may be of the same or different types.

[0054] The housing 205 can enclose a receiving space, and the first circuit board 202, the second circuit board 203 and the third circuit board 204 are located within the receiving space enclosed by the housing 205, so that the housing 205 can protect the first circuit board 202, the second circuit board 203 and the third circuit board 204.

[0055] In other examples, the electronic device 200 may also include one circuit board, two circuit boards, or four circuit boards, etc. The embodiments of this application do not further limit the number of circuit boards included in the electronic device 200. The following example, assuming the electronic device 200 includes a first circuit board 202, a second circuit board 203, and a third circuit board 204, will be used for further illustration.

[0056] Continue to refer to Figure 1 and Figure 2 The electronic device 200 includes a processor 201. For example, the processor 201 may include at least one of a system-on-chip (SOC), a central processing unit (CPU), or a microcontroller unit (MCU). There may be multiple processors 201, and these processors may be of the same or different types. The multiple processors 201 may be respectively disposed on the second circuit board 203 and the third circuit board 204.

[0057] Figure 3 The following are schematic block diagrams illustrating the structure of an electronic device provided in some embodiments of this application. In some examples, the processor 201 may include a first processor 201a and a second processor 201b. For example, the first processor 201a may be disposed on a second circuit board 203, and the second processor 201b may be disposed on a third circuit board 204.

[0058] Understandably, the number of first processors 201a can be one or more, and the number of second processors 201b can be one or more. The number of first processors 201a and the number of second processors 201b can be equal or unequal.

[0059] Reference Figure 2 and Figure 3 The electronic device 200 includes a power supply system 100, which is coupled to a processor 201 (a first processor 201a and a second processor 201b). For example, the power supply system 100 may be located on a first circuit board 202. This isolates the power supply system 100 from the processor 201 located on a second circuit board 203 and a third circuit board 204, reducing the impact of the power supply system 100 on the processor 201. In some examples, the first circuit board 202 and the power supply system 100 may be collectively referred to as a power management board.

[0060] Understandably, the external alternating current (AC) power supply... Figure 1 and Figure 2 Not shown in the image, see [link / reference]. Figure 3The first processor 201a can be coupled to the power supply system 100 via the first circuit board 202, and the power supply system 100 can be coupled to the first processor 201a disposed on the second circuit board 203 via the second circuit board 203, thereby enabling it to supply power to the first processor 201a. Furthermore, the power supply system 100 can be coupled to the second processor 201b disposed on the third circuit board 204 via the third circuit board 204, thereby enabling it to supply power to the second processor 201b.

[0061] See Figure 1 and Figure 2 The second circuit board 203 and the third circuit board 204 can be coupled together, so that the first processor 201a disposed on the second circuit board 203 and the second processor 201b disposed on the third circuit board 204 can communicate to realize information exchange.

[0062] Understandably, the first circuit board 202 may house other devices besides the power supply system 100, and the second circuit board 203 and the third circuit board 204 may house other devices besides the processor 201. The embodiments of this application do not further limit the number or type of other devices housed on the first circuit board 202, the second circuit board 203, and the third circuit board 204. The power supply system 100 will be illustrated below.

[0063] In some examples, such as Figure 3 As shown, the power supply system 100 may include an AC-DC (direct current, DC) converter module 110 and a step-down module 120. The AC-DC converter module 110 and the step-down module 120 are coupled together.

[0064] For example, such as Figure 3 As shown, the input terminal 1101 of the AC-DC converter module 110 is coupled to the AC power supply, and the output terminal 1102 of the AC-DC converter module 110 is coupled to the input terminal 1201 of the step-down module 120. For example, the output terminal 1102 of the AC-DC converter module 110 can be coupled to the input terminal 1201 of the step-down module 120 through the first bus 101.

[0065] Continue to refer to Figure 3 The output terminal 1202 of the step-down module 120 can be coupled to the power input terminal 2011 of the processor 201. For example, the output terminal 1202 of the step-down module 120 can be coupled to the power input terminal 2011 of the processor 201 through the second bus 102.

[0066] For example, the AC power supply AC can be mains power. Alternatively, the AC power supply AC may also include an energy storage device coupled to the mains power to provide surge protection. The voltage of the AC power supply AC can be 220V, 380V, or other values. The embodiments of this application do not further limit the voltage value of the AC power supply AC.

[0067] The AC-DC converter module 110 is coupled between the AC power supply AC and the step-down module 120, enabling the AC-DC converter module 110 to convert the AC power supplied by the AC power supply AC into DC power and provide the converted DC voltage to the step-down module 120.

[0068] For example, the first bus 101 can be a high-voltage bus. The AC-DC conversion module 110 is coupled to the step-down module 120 through the high-voltage bus, so that the converted DC power can be provided to the step-down module 120 through the high-voltage bus.

[0069] The step-down module 120 is coupled between the AC-DC converter module 110 and the processor 201. For example, the step-down module 120 can be a DC-DC step-down module, capable of stepping down the DC power from the AC-DC converter module 110 and providing the stepped-down DC power to the processor 201. The output voltage of the step-down module 120 can be 4.5V, 4V, 3.3V, or other values. The embodiments of this application do not further limit the value of the output voltage of the step-down module 120.

[0070] For example, the second bus 102 can be a low-voltage bus, and the step-down module 120 is coupled to the processor 201 through the low-voltage bus, so that the DC power after step-down processing can be provided to the processor 210 through the low-voltage bus.

[0071] like Figure 3 As shown, the output terminal 1202 of the step-down module 120 can be coupled to the first processor 201a disposed on the second circuit board 203 and the second processor 201b disposed on the third circuit board 204, respectively, so as to supply power to the first processor 201a and the second processor 201b respectively.

[0072] Figure 4 This is a schematic block diagram of the structure of an electronic device provided in some embodiments of this application. In some examples, such as... Figure 4 As shown, the power supply system 100 may also include a BUCK module 160 and a power management unit (PMU) 170.

[0073] The output terminal 1202 of the step-down module 120 is coupled to the input terminal 1601 of the BUCK module 160, the output terminal 1602 of the BUCK module 160 is coupled to the input terminal 1701 of the power management module 170, and the output terminal 1702 of the power management module 170 is coupled to the power supply input terminal 2011 of the processor 201.

[0074] Understandably, the BUCK module 160 may include a BUCK circuit to step down the voltage. The power management module 170 manages the power supply to the processor 201. The BUCK module 160 and the power management module 170 are coupled between the step-down module 120 and the processor 201, enabling them to convert the voltage output from the step-down module 120 into the voltage required by the processor 201, thus allowing the processor 201 to operate normally.

[0075] For example, such as Figure 4 As shown, the output terminal 1702 of the power management module 170 can be coupled to the power input terminal 2011 of the second processor 201b. Alternatively, the output terminal 1702 of the power management module 170 can also be coupled to the power input terminal 2011 of the first processor 201a. Or, the output terminal 1702 of the power management module 170 can also be coupled to the power input terminals 2011 of both the first processor 201a and the second processor 201b.

[0076] Understandably, electronic device 200 does not include a battery. In the event of an AC power outage, processor 201 needs to promptly acquire the AC power outage signal and execute a power-down sequence based on the signal, such as shutting down other devices in electronic device 200 and storing data in memory.

[0077] Figure 5 This is a schematic block diagram of the structure of an electronic device in some possible implementations of this application. Figure 6 This is a schematic block diagram of the electronic device in some other possible implementations of this application. Figure 7 This is a schematic block diagram of the structure of an electronic device in some possible implementations of this application.

[0078] In the accompanying drawings of this application, the coupling relationship is shown clearly using... Figure 5 , Figure 6 and Figure 7 For example, dashed lines show the coupling relationship between the detection module and other components, while solid lines show the coupling relationship between the AC-DC conversion module 110 and the step-down module 120 and other components.

[0079] In some possible implementations, such as Figure 5 , Figure 6 and Figure 7 As shown, the power supply system 100 may further include a detection module 180. The detection module 180 is used to detect the power supply status of the AC power supply and, when the AC power supply is in a power-off state, sends a power-off signal to the processor 201. The processor 201 can autonomously initiate and execute a power-off sequence based on the received power-off signal.

[0080] like Figure 5 and Figure 6 As shown, the input terminal 1801 of the detection module 180 can be coupled to an AC power supply or the first bus 101, and the output terminal 1802 of the detection module 180 is coupled to the signal input terminal 2012 of the processor 201, enabling the processor 201 to obtain the power-down signal output by the detection module 180. For example, the output terminal 1802 of the detection module 180 can also be electrically connected to the signal input terminal 1703 of the power management module 170, enabling the power management module 170 to obtain the power-down signal output by the detection module 180.

[0081] When the input terminal 1801 of the detection module 180 is coupled to an AC power supply, such as Figure 5 As shown, the detection module 180 can acquire the voltage of the AC power supply, determine the power supply status of the AC power supply based on the voltage of the AC power supply, and output a power failure signal when the AC power supply fails.

[0082] When the input terminal 1801 of the detection module 180 is coupled to the first bus 101, such as Figure 6 As shown, the detection module 180 can acquire the voltage of the first bus 101 and determine the power supply status of the AC power supply based on the voltage of the first bus 101. When the AC power supply fails, it outputs a power failure signal.

[0083] When the input terminal 1801 of the detection module 180 is coupled to an AC power supply, a voltage divider unit can be connected in series between the detection module 180 and the AC power supply. When the input terminal 1801 of the detection module 180 is coupled to the first bus 101, a voltage divider unit can also be connected in series between the detection module 180 and the first bus 101. Understandably, the voltage divider unit can divide the voltage, thereby reducing the risk of damage to the detection module 180 due to high voltage between the AC power supply and the first bus 101.

[0084] For example, a voltage divider unit may include one or more voltage divider resistors. In the case where the voltage divider unit includes multiple voltage divider resistors, the multiple voltage divider resistors are connected in series. The input terminal 1801 of the detection module 180 may be coupled between two voltage divider resistors connected in series.

[0085] Understandably, the AC power supply and the voltage of the first bus 101 are relatively high, and the resistance of the voltage divider unit is relatively high, resulting in a relatively high voltage across the voltage divider unit. Consequently, even a small current flowing through the voltage divider unit will result in a relatively high power consumption. For example, the power consumption of the voltage divider unit can reach approximately 0.05W (watts). When the electronic device 200 is in standby mode, its power consumption is typically required to be low, for example, less than or equal to 0.5W. The voltage divider unit's consumption of approximately 0.05W is detrimental to achieving low power consumption in standby mode, thus affecting the standby energy efficiency requirements of the electronic device 200.

[0086] like Figure 7 As shown, the input terminal 1801 of the detection module 180 can also be coupled to the second bus 102. Since the voltage of the second bus 102 is lower, there is no need to set up a voltage divider unit, which is beneficial for achieving low power consumption of the electronic device 200 in standby mode. Alternatively, when the input terminal 1801 of the detection module 180 is coupled to the second bus 102, a voltage divider unit can also be set up and coupled between the second bus 102 and the detection module 180. Since the voltage of the second bus 102 is lower, the voltage across the voltage divider unit can be lower, which is beneficial for achieving low power consumption of the electronic device 200 in standby mode.

[0087] However, when the AC power supply fails, the voltage of the first bus 101 drops slowly. After the voltage of the first bus 101 drops to a certain value, the voltage of the second bus 102 begins to drop slowly, which affects the power failure recognition speed of the detection module 180.

[0088] The processor 201 requires at least 100ms (milliseconds) from receiving the power-down signal to completing the power-down sequence execution. The detection module 180 is coupled to the second bus 102. Under high-load operating conditions of the electronic device 200, the time from the detection module 180 detecting the AC power failure to the processor 201 stopping operation is short, typically less than 100ms. This cannot meet the requirements for the processor 201 to execute the power-down sequence, affecting the reliability of the processor 201 and other devices such as the memory.

[0089] Figure 8 This is a schematic block diagram of the structure of an electronic device provided in some embodiments of this application. Figure 9 This is a schematic block diagram of the structure of an electronic device provided in some embodiments of this application.

[0090] Based on this, such as Figure 8 and Figure 9As shown in the embodiments of this application, the power supply system 100 includes a first voltage detection module 130 and a second voltage detection module 140. The input voltage of the first voltage detection module 130 is a first voltage, and the input voltage of the second voltage detection module 140 is a second voltage, which is less than the first voltage.

[0091] For example, the first voltage detection module 130 can be coupled to a higher voltage location, and the second voltage detection module 140 can be coupled to a lower voltage location, such that the second voltage is lower than the first voltage. For example, the first voltage detection module 130 may or may not include a first voltage divider unit. The second voltage detection module 140 may or may not include a second voltage divider unit. Understandably, the second voltage being lower than the first voltage ensures that the power consumption of the second voltage detection module 140 is lower than that of the first voltage detection module 130.

[0092] The first voltage detection module 130 is used to: detect the power supply status of the AC power source when the electronic device 200 is in a first operating state, and output a first power-down signal when the AC power source is in a power-off state. The second voltage detection module 140 is used to: detect the power supply status of the AC power source when the electronic device 200 is in a second operating state, and output a second power-down signal when the AC power source is in a power-off state. The power of the electronic device 200 in the second operating state is less than the power of the electronic device 200 in the first operating state.

[0093] For example, the first power-down signal can be an electrical signal, such as a high-level signal or a low-level signal. Alternatively, the first level signal can also be an optical signal. The second power-down signal can be an electrical signal, such as a high-level signal or a low-level signal. Alternatively, the second level signal can also be an optical signal. The first and second power-down signals can be of the same or different types.

[0094] In some examples, the first operating state can be a normal operating state, and the second operating state can be a standby state. Understandably, in the normal operating state, the electronic device 200 can perform functions such as image display and human-computer interaction. In the standby state, the electronic device 200 cannot perform image display or human-computer interaction functions. Setting the first operating state to normal operating state and the second operating state to standby state ensures that the power consumption of the electronic device 200 in the second operating state is less than the power consumption of the electronic device 200 in the first operating state.

[0095] Alternatively, the first working state can be another state with higher power, and the second working state can be another state with lower power, such as sleep state or screen-off state.

[0096] When the AC power supply fails, the voltage at the higher voltage level drops first. After the voltage at the higher voltage level drops to a certain value, the voltage at the lower voltage level begins to drop. Therefore, when the electronic device 200 is in its first operating state, the first voltage detection module 130 operates. The first voltage detection module 130 can determine the AC power supply status based on the first voltage, enabling it to quickly obtain the AC power supply status and shortening the time required for it to identify the AC power failure. This provides sufficient time for the processor 201 to execute the power-down sequence, meeting the requirements of the processor 201's power-down sequence execution.

[0097] When the electronic device 200 is in its first operating state, the second voltage detection module 140 can operate, eliminating the need for a switch structure to turn the second voltage detection module 140 off, thus simplifying the structure of the power supply system 100. Alternatively, the second voltage detection module 140 can also be deactivated, thereby reducing power consumption when the electronic device 200 is in its first operating state. This application's embodiment uses the operation of the second voltage detection module 140 when the electronic device 200 is in its first operating state as an example for further illustration.

[0098] When the electronic device 200 is in the second working state, the first voltage detection module 140 stops working and the second voltage detection module 140 works, which can reduce the power consumption of the electronic device 200 in the second working state, which is conducive to achieving low power consumption of the electronic device 200 in the second working state, so that the power of the electronic device 200 in the second working state can be less than or equal to 0.5W, thus meeting the standby energy efficiency requirements of the electronic device 200.

[0099] Furthermore, when the electronic device 200 is in its second operating state, the second voltage detection module 140 can determine the AC power supply status based on the second voltage, enabling the processor 201 to obtain power-down information. Understandably, when the electronic device 200 is in its second operating state, its operating power is relatively low, and the time from the second detection module 140 issuing the second power-down signal to the processor 201 ceasing normal operation is greater than 100ms, meeting the requirements of the processor 201's power-down timing.

[0100] In other words, the embodiments of this application configure the power supply system 100 to include a first voltage detection module 130 and a second voltage detection module 140. When the electronic device 200 is in a high power consumption state, the first voltage detection module 130 determines the AC power supply state based on a first voltage; when the electronic device 200 is in a low power consumption state, the second voltage detection module 140 determines the AC power supply state based on a second voltage. This allows the first voltage detection module 130 and the second voltage detection module 140 to match the two different operating states of the electronic device 200, automatically detecting the AC power supply state in both high and low power consumption scenarios, and simultaneously meeting the timeliness and power consumption requirements for power failure detection.

[0101] In some examples, such as Figure 8 and Figure 9 As shown, the first voltage is the input voltage of the AC-DC converter module 110; or, the first voltage is the output voltage of the AC-DC converter module 110. The second voltage is the output voltage of the buck converter module 120.

[0102] like Figure 8 As shown, when the detection input terminal 1301 of the first voltage detection module 130 is coupled to the input terminal 1101 of the AC-DC conversion module 110, the input voltage of the first voltage detection module 130 is the input voltage of the AC-DC conversion module 110. That is, the first voltage is the input voltage of the AC-DC conversion module 110. The input voltage of the first voltage detection module 130 is approximately equal to the voltage of the AC power supply. In this case, the first voltage can be referred to as an AC detection module or a zero-crossing detection module.

[0103] like Figure 9 As shown, when the detection input terminal 1301 of the first voltage detection module 130 is coupled to the first bus 101, the input voltage of the first voltage detection module 130 is the output voltage of the AC-DC conversion module 110 (the voltage of the first bus 101), that is, the first voltage is the output voltage of the AC-DC conversion module 110 (the voltage of the first bus 101). At this time, the first voltage detection module 130 can be referred to as the DC high voltage detection module.

[0104] like Figure 8 and Figure 9As shown, when the detection input terminal 1401 of the second voltage detection module 140 is coupled to the second bus 102, the input voltage of the second voltage detection module 140 is the output voltage of the step-down module 120 (the voltage of the second bus 102), that is, the second voltage is the output voltage of the step-down module 120 (the voltage of the second bus 102). For example, the second voltage detection module 140 can be referred to as a DC low-voltage detection module.

[0105] When the electronic device 200 is in its first operating state, such as Figure 8 As shown, if the first voltage detection module 130 is coupled to the input terminal 1101 of the AC-DC conversion unit 110, the first voltage detection module 130 can acquire the input voltage of the AC-DC conversion unit 110. If the input voltage of the AC-DC conversion unit 110 is less than a first voltage threshold, the first voltage detection module 130 determines that the AC power supply has failed and outputs a first power failure signal. For example, the value of the first voltage threshold can be 180V, 150V, or 120V, etc. The embodiments of this application do not further limit the value of the first voltage threshold.

[0106] Understandably, when the input voltage of the AC-DC conversion unit 110 drops below the first voltage threshold, the voltage of the first bus 101 has not yet dropped below the second voltage threshold (the second voltage threshold is lower than the first voltage threshold). Compared to coupling the first voltage detection module 130 to the first bus 101, coupling the first voltage detection module 130 to the input terminal 1101 of the AC-DC conversion unit 110 can improve the speed at which the first voltage detection module 130 detects the AC power failure.

[0107] Furthermore, when the voltage of the AC power supply drops below the first voltage threshold, the voltage of the second bus 102 does not drop below the third voltage threshold (the third voltage threshold is lower than the second voltage threshold). The second bus 102 can provide the processor 201 with the required operating voltage, enabling the processor 201 to execute the power-down sequence.

[0108] When the electronic device 200 is in its first operating state, such as Figure 9 As shown, if the first voltage detection module 130 is coupled to the first bus 101, the first voltage detection module 130 can obtain the voltage of the first bus 101. If the voltage of the first bus 101 is less than the second voltage threshold, the first voltage detection module 130 determines that the AC power supply has failed and outputs a first power failure signal. For example, the value of the second voltage threshold can be 160V, 120V, or 90V, etc. The embodiments of this application do not further limit the value of the second voltage threshold.

[0109] Understandably, while the voltage of the first bus 101 drops below the second voltage threshold, the voltage of the second bus 102 has not yet dropped below the third voltage threshold. The second bus 102 is able to provide the processor 201 with the required operating voltage, enabling the processor 201 to execute the power-down sequence.

[0110] By coupling the first voltage detection module 130 to the first bus 101, the AC-DC conversion module 110 can function as a filter. Compared to coupling the first voltage detection module 130 to the input terminal 1101 of the AC-DC conversion module 110, this reduces the impact of AC power fluctuations (such as negative voltage surges, lightning surges, etc.) on the first voltage detection module 130, thereby improving the accuracy and reliability of the first voltage detection module 130.

[0111] Understandably, when the electronic device 200 is in the first operating state, if the AC power supply fails, the voltage of the AC power supply and the voltage of the first bus 101 will have dropped to the set voltage threshold (first voltage threshold and second voltage threshold) before the voltage of the second bus 102 drops to the third voltage threshold.

[0112] That is, before the second voltage detection module 140 determines that the AC power supply has failed, the first voltage detection module 130 has already determined that the AC power supply has failed and outputs the first power failure signal. In other words, when the electronic device 200 is in the first working state, the second voltage detection module 140 determines that the AC power supply has failed later than the first voltage detection module 130 determines that the AC power supply has failed.

[0113] When the electronic device 200 is in the second working state, the first voltage detection module 130 stops detecting the AC power supply status, thereby reducing the energy consumption of the electronic device 200 in the second working state. This helps to achieve low power consumption of the electronic device 200 in the second working state (e.g., standby state), so that the power of the electronic device 200 in the second working state can be less than or equal to 0.5W, meeting the standby energy efficiency requirements of the electronic device 200.

[0114] When the electronic device 200 is in the second operating state, the second voltage detection module 140 detects the power supply status of the second bus 102. If the voltage of the second bus 102 is less than a third voltage threshold, the second voltage detection module 140 determines that the AC power supply has failed and outputs a second power failure signal. For example, the value of the third voltage threshold can be 3.2V, 3V, or 2.9V, etc. The embodiments of this application do not further limit the value of the third voltage threshold.

[0115] Understandably, when the electronic device 200 is in the second operating state, the load on the power supply system 100 is relatively small. The time from when the voltage of the second bus 102 is less than the third voltage threshold to when the voltage of the second bus 102 drops to the minimum input voltage of the BUCK module 160 can be greater than 100ms. That is, the time from when the second voltage detection module 140 determines that the AC power supply has failed to the time when the processor 201 can no longer work normally can be greater than 100ms, which meets the requirements of the processor 201 to execute the power-down sequence.

[0116] The first voltage is set as the input voltage of the AC-DC converter module 110; or, the first voltage is set as the output voltage of the AC-DC converter module 110, so that the first voltage detection module 130 can be coupled to the input terminal 1101 or the output terminal 1102 of the AC-DC converter module 110. This improves the setting flexibility of the first voltage detection module 130 and allows the first voltage detection module 130 to be coupled to a higher voltage position. This enables the first voltage detection module 130 to quickly obtain the power supply status of the AC power supply, shortens the time required for the first voltage detection module 130 to identify the AC power supply failure, and reserves sufficient time for the processor 201 to execute the power-down sequence, thus meeting the requirements of the processor 201 to execute the power-down sequence.

[0117] The second voltage is set to the output voltage of the step-down module 120, so that the second voltage detection module 140 can be coupled to the output terminal 1202 of the step-down module 120. This allows the second voltage detection module 140 to be coupled at a relatively low voltage position, reducing the power consumption of the electronic device 200 in the second operating state. This facilitates the achievement of low power consumption of the electronic device 200 in the second operating state, ensuring that the power of the electronic device 200 in the second operating state is less than or equal to 0.5W, thus meeting the standby energy efficiency requirements of the electronic device 200.

[0118] Figure 10 A schematic diagram of the voltage curve after the AC power supply is turned off in the first operating state provided for some embodiments of this application. Figure 10 In the diagram, the horizontal axis t represents time, and the vertical axis V represents voltage. From... Figure 10 As can be seen, the AC power supply (AC) is de-energized at time t0. For example, the AC power supply (AC) may include an energy storage device to provide surge protection. After the mains power fails, the energy storage device begins to discharge, causing the voltage of the AC power supply (AC) to rise slowly and stabilize at a certain voltage until the energy storage device finishes discharging.

[0119] After the AC power supply VC is de-energized, the voltage on the first bus 101 drops slowly. When the electronic device 200 is in its first operating state, such as... Figure 10As shown, when the voltage of the first bus 101 drops below the first voltage threshold V1, the output signal of the first voltage detection module 130 switches from low to high, that is, the first voltage detection module 130 outputs the first power-down signal, and the processor 201 begins to execute the power-down sequence. At this time, the voltage of the second bus 102 remains at the initial voltage V0, which can provide energy to the processor 201, enabling the processor 201 to execute the power-down sequence.

[0120] The time required from the moment the output signal of the first voltage detection module 130 switches from low to high level to the moment when the voltage of the second bus 102 drops from the initial voltage V0 to below the third voltage threshold V2 is called the first time t1. The first time t1 is approximately 600ms, which meets the requirements of the processor 201 for executing the power-down timing.

[0121] Figure 11 This is a schematic diagram of the voltage curve after the AC power supply is turned off in the second operating state provided for some embodiments of this application. Figure 11 In the diagram, the horizontal axis t represents time, and the vertical axis represents voltage V.

[0122] When the electronic device 200 is in its second operating state, such as Figure 11 As shown, the time required for the voltage of the second bus 102 to drop from the initial voltage V0 to below the third voltage threshold V2 is the second time t2. The second time t2 is approximately 136ms, which meets the power-down timing requirements of the human processor 201.

[0123] Continue to refer to Figure 8 and Figure 9 In some examples, the power supply system 100 also includes a logic module 150. When the electronic device 200 is in a first operating state, the logic module 150 receives a first power-down signal and outputs a third power-down signal based on the first power-down signal. When the electronic device 200 is in a second operating state, the logic module 150 receives a second power-down signal and outputs a third power-down signal based on the second power-down signal.

[0124] For example, such as Figure 8 and Figure 9 As shown, the first input terminal 1501 of the logic module 150 is coupled to the output terminal 1302 of the first voltage detection module 130, the second input terminal 1502 of the logic module 150 is coupled to the output terminal 1402 of the second voltage detection module 140, and the output terminal 1503 of the logic module 150 is coupled to the signal input terminal 2012 of the processor 201. When the logic module 150 receives a first power-down signal or a second power-down signal, the logic module 150 outputs a third power-down signal.

[0125] The third power-down signal can be either a low-level signal or a high-level signal. This application's embodiments use a low-level signal as an example for further illustration.

[0126] For example, logic module 150 can be an AND gate. That is, when the AC power supply is not interrupted, neither the first voltage detection module 130 nor the second voltage detection module 140 outputs a power-down signal, and logic module 150 outputs a level signal, such as a high-level signal. When the AC power supply is interrupted, one of the first voltage detection module 130 and the second voltage detection module 140 outputs a power-down signal, and logic module 150 outputs another level signal, such as a low-level signal.

[0127] By setting up logic module 150, the first voltage detection module 130 and the second voltage detection module 140 do not need to be coupled to processor 201 respectively. This eliminates the need for processor 201 to poll the output signals of the first voltage detection module 130 and the second voltage detection module 140, thereby simplifying the control logic of processor 201 and saving processor 201 resources.

[0128] In some examples, processor 201 performs power-down timing based on a third power-down signal.

[0129] This configuration simplifies the control logic of the processor 201, allowing it to seamlessly identify the first power-down signal from the first detection module 130 and the second power-down signal from the second detection module 140 via the third power-down signal, thus conserving the processor 201's resources. Furthermore, it eliminates the need for additional logic gates between the logic module 150 and the processor 201, simplifying the structure of the power supply system 100.

[0130] In some examples, logic module 150 is used to send a third power-down signal to the first processor 201a and the second processor 201b. One of the first processor 201a and the second processor 201b performs a power-down sequence based on the third power-down signal.

[0131] For example, such as Figure 8 and Figure 9 As shown, the output terminal 1503 of the logic module 150 can be coupled to the signal input terminal 2012 of the first processor 201a and the signal input terminal 2012 of the second processor 201b, enabling the logic module 150 to send a power-down signal to the first processor 201a and the second processor 201b. Understandably, either the first processor 201a or the second processor 201b can execute the power-down sequence.

[0132] The logic module 150 is configured to send a third power-down signal to the first processor 201a and the second processor 201b, enabling both the first processor 201a and the second processor 201b to receive the third power-down signal. One of the first processor 201a and the second processor 201b executes the power-down sequence based on the third power-down signal, thus avoiding the risk of duplicate or conflicting execution of the power-down sequence.

[0133] For example, the output terminal 1503 of the logic module 150 can also be electrically connected to the signal input terminal 1703 of the power management module 170, so that the power management module 170 can receive a third power-down signal.

[0134] In some examples, when the electronic device 200 is in a second operating state, the processor 201 outputs a standby signal to the first voltage detection module 130, and the first voltage detection module 130 stops operating based on the standby signal.

[0135] For example, such as Figure 8 and Figure 9 As shown, the signal input terminal 1303 of the first voltage detection module 130 is coupled to the signal output terminal 2013 of the processor 201.

[0136] After the power supply system 100 is powered on, both the first voltage detection module 130 and the second voltage detection module 140 are in operation. At this time, the processor 201 can obtain the operating status of the electronic device 200. For example, the processor 201 can obtain the operating status of the electronic device 200 according to user instructions, or the processor 201 can also obtain the operating status of the electronic device 200 according to the load of the power supply system 100. The embodiments of this application do not further limit the method by which the processor 201 obtains the operating status of the electronic device 200.

[0137] When the processor 201 determines that the electronic device 200 is in the second operating state, the processor 201 controls the first voltage detection module 130 to stop working, thereby reducing the power consumption of the electronic device 200 in the second operating state. Since the second voltage detection module 140 is always operational, the processor 201 does not need to control the second voltage detection module 140 to turn on. That is, when the electronic device 200 is in the second operating state, the second voltage detection module 140 can automatically detect the AC power supply status.

[0138] When the electronic device 200 is in the second working state, the processor 201 outputs a standby signal to the first voltage detection module 130. The first voltage detection module 130 stops working based on the standby signal, which can reduce the energy consumption of the electronic device 200 in the second working state and enable the first voltage detection module 130 to automatically stop working. This realizes the adaptive switching between the first voltage detection module 130 and the second voltage detection module 140 under different working scenarios without manual operation by the user, thus improving the ease of use of the power supply system 100.

[0139] In some examples, when the electronic device 200 is in a second operating state, one of the first processor 201a and the second processor 201b sends a standby signal to the first voltage detection module 130. This configuration avoids the risk of repeatedly sending the standby signal.

[0140] Figure 12 This is a schematic block diagram showing the connection of logic modules, video chips, and artificial intelligence chips provided in some embodiments of this application. Figure 13 This is a schematic block diagram showing the connection of logic modules, video chips, artificial intelligence chips, and microcontrollers provided in some embodiments of this application. Figure 14 This is a schematic block diagram of the structure of an electronic device provided in some embodiments of this application.

[0141] In some examples, such as Figure 12 As shown, the first processor 201a includes a video chip 201a1, or, as... Figure 13 and Figure 14 As shown, the first processor 201a includes a video chip 201a1 and a microcontroller unit 201a2. (As...) Figure 12 , Figure 13 and Figure 14 As shown, the second processor 201b includes an artificial intelligence (AI) chip 201b1.

[0142] Understandably, the video chip 201a1 can be used to process data related to image display. For example, the video chip 201a1 can be a video SOC. The microcontroller unit 201a2 can be used to process data related to image display. The artificial intelligence chip 201b1 can be used to process data related to intelligent interaction. For example, the artificial intelligence chip 201b1 can be an AI SOC.

[0143] like Figure 14As shown, the video chip 201a1 and the microcontroller unit 201a2 can be mounted on and coupled to the second circuit board 203. In this case, the second circuit board 203 and the video management chip 201a1 can be collectively referred to as the video management board. The artificial intelligence chip 201b1 can be mounted on and coupled to the third circuit board 204. In this case, the third circuit board 204 and the artificial intelligence chip 201b1 can be collectively referred to as the artificial intelligence management board.

[0144] The first processor 201a includes a video chip 201a1, or the first processor 201a includes a video chip 201a1 and a microcontroller unit 201a2. The second processor 201b includes an artificial intelligence (AI) chip 201b1, enabling the electronic device 200 to have display functions and artificial intelligence interaction functions to meet different usage needs.

[0145] In some examples, such as Figure 12 As shown, the signal output terminal 2013 of the video chip 201a1 can be coupled to the signal input terminal 1303 of the first voltage detection module 130. When the electronic device 200 is in the second working state, the video chip 201a1 controls the first voltage detection module 130 to stop detecting the AC power supply status.

[0146] In the case where the processor 201 includes a microcontroller unit 201a2, such as Figure 13 and Figure 14 As shown, the signal output terminal 2013 of the microcontroller unit 201a2 is coupled to the signal input terminal 1303 of the first voltage detection module 130. When the electronic device 200 is in the second operating state, the microcontroller unit 201a2 controls the first voltage detection module 130 to stop detecting the AC power supply status.

[0147] Understandably, when the processor 201 includes a microcontroller unit 201c, such as Figure 14 As shown, the output terminal 1202 of the step-down module 120 is coupled to the power supply input terminal 2011 of the microcontroller unit 201a2, and the output terminal 1503 of the logic module 150 is coupled to the signal input terminal 2012 of the microcontroller unit 201a2. In some examples, the artificial intelligence chip 201b1 is used to execute the power-down sequence.

[0148] Figure 15 This is a schematic diagram of the circuit topology of an electronic device provided in some embodiments of this application. Figure 16 This is a schematic diagram of the circuit topology of a first voltage detection module provided in some embodiments of this application.

[0149] In some examples, such as Figure 15As shown, the first voltage detection module 130 includes a first comparison unit 131 and an auxiliary power supply 132. When the electronic device 200 is in a first operating state, the first comparison unit 131 compares a first voltage with a first reference voltage. If the first voltage is less than the first reference voltage, the first comparison unit 131 determines that the AC power supply has failed. The auxiliary power supply 132 supplies power to the first comparison unit 131. When the electronic device 200 is in a second operating state, the processor 201 sends a standby signal to the auxiliary power supply 132, and the auxiliary power supply 132 stops supplying power based on the standby signal.

[0150] For example, such as Figure 15 and Figure 16 As shown, the first comparison unit 131 can be a comparator. The auxiliary power supply 132 can be a TL431. The power supply input terminal 1324 of the auxiliary power supply 132 can be coupled to the first bus 101, so that the first bus 101 can supply power to the auxiliary power supply 132. Alternatively, the power supply input terminal 1324 of the auxiliary power supply 132 can also be coupled to the working power supply, so that the working power supply can supply power to the auxiliary power supply 132.

[0151] like Figure 15 and Figure 16 As shown, the power output terminal 1322 of the auxiliary power supply 132 is coupled to the power input terminal P14 of the first comparison unit 131. Understandably, when the auxiliary power supply 132 supplies power to the first comparison unit 131, the first comparison unit 131 can operate normally. When the auxiliary power supply 132 stops supplying power to the first comparison unit 131, the first comparison unit 131 stops operating.

[0152] For example, a third voltage divider resistor R3 can be provided between the power output terminal 1322 of the auxiliary power supply 132 and the power input terminal P14 of the first comparator unit 131. Figure 15 Not shown in the image, see [link / reference]. Figure 16 The third voltage divider resistor R3 acts as a voltage divider, reducing the risk of the first comparison unit 131 being damaged due to excessively high voltage supplied by the auxiliary power supply 132.

[0153] Understandably, the voltage at the inverting input terminal P11 of the first comparator unit 131 is a first voltage. The inverting input terminal P11 of the first comparator unit 131 is coupled to either the input terminal 1101 or the output terminal 1102 of the AC-DC converter module 110. The non-inverting input terminal P12 of the first comparator unit 131 is coupled to the first reference output terminal 1323 of the auxiliary power supply 132, which provides the first reference voltage to the first comparator unit 131. The output terminal P13 of the first comparator unit 131 is coupled to the logic module 150. For example, the output terminal P13 of the first comparator unit 131 can be connected via other components (e.g., output unit 133). Figure 15 (Not shown in the image) is coupled to logic module 150.

[0154] Taking the inverting input terminal P11 of the first comparison unit 131 coupled to the output terminal 1102 of the AC-DC conversion module 110 as an example, Figure 16 As shown, the first voltage detection module 130 may include a first voltage divider unit. The first voltage divider unit may include a first voltage divider resistor R1 and a second voltage divider resistor R2 connected in series. The first voltage divider unit is connected in series between the inverting input terminal P11 of the first comparison unit 131 and the first bus 101, and plays the role of voltage division, so that the voltage (i.e., the first voltage) of the inverting input terminal P11 of the first comparison unit 131 can be less than the voltage of the first bus 101, thereby reducing the risk of the first comparison unit 131 being damaged due to excessively high voltage of the first bus 101.

[0155] Alternatively, the first voltage divider unit may not be provided between the inverting input terminal P11 of the first comparator unit 131 and the first bus 101. In this case, the voltage (i.e., the first voltage) at the inverting input terminal P11 of the first comparator unit 131 is equal to or approximately equal to the voltage of the first bus 101. Understandably, the voltage at the non-inverting input terminal P12 of the first comparator unit 131 is equal to or approximately equal to the first reference voltage.

[0156] With the first voltage divider unit configured, the voltage at the inverting input terminal P11 of the first comparator unit 131 (i.e., the first voltage) is less than the voltage of the first bus 101, and in this case, the first reference voltage is less than the second voltage threshold. Without the first voltage divider unit configured, the voltage at the inverting input terminal P11 of the first comparator unit 131 (i.e., the first voltage) is equal to or approximately equal to the voltage of the first bus 101, and in this case, the first reference voltage is equal to or approximately equal to the first voltage threshold. Understandably, when the first voltage is less than the first reference voltage, the first comparator unit 131 determines that the voltage of the first bus 101 is less than the first voltage threshold.

[0157] When the electronic device 200 is in its first operating state, the processor 201 sends a power-on signal to the auxiliary power supply 132, and the auxiliary power supply 132 supplies power to the first comparison unit 131 based on the power-on signal. The first comparison unit 131 compares the voltage (i.e., the first voltage) at the inverting input terminal P11 of the first comparison unit 131 with the voltage (i.e., the first reference voltage) at the non-inverting input terminal P12 of the first comparison unit 131. If the voltage (i.e., the first voltage) at the inverting input terminal P11 of the first comparison unit 131 is less than the first reference voltage, the first comparison unit 131 determines that the AC power supply is down, and the first comparison unit 131 outputs a high-level signal.

[0158] Conversely, if the voltage (i.e., the first voltage) at the inverting input terminal P11 of the first comparison unit 131 is greater than the first reference voltage, the first comparison unit 131 determines that the AC power supply has not been interrupted, and the first comparison unit 131 outputs a low-level signal.

[0159] When the electronic device 200 is in the second operating state, the processor 201 sends a standby signal to the auxiliary power supply 132, and the auxiliary power supply 132 stops supplying power to the first comparison unit 131 based on the standby signal. At this time, the first comparison unit 131 stops working, reducing the power consumption of the electronic device 200 in the second operating state.

[0160] Understandably, the first comparison unit 131 can compare the first voltage and the first reference voltage when the electronic device 200 is in the first working state, thereby determining whether the AC power supply has failed. The logic is simple, no complex circuit structure is required, and the cost of the power supply system 100 is reduced.

[0161] Furthermore, when the electronic device 200 is in the second working state, the processor 201 controls the first auxiliary power supply 132 to stop supplying power to the first comparison unit 131, thereby reducing the energy consumption of the electronic device 200 in the second working state and facilitating the realization of low power consumption of the electronic device 200 in the second working state (e.g., standby state).

[0162] For example, the first comparator unit 131 can be an operational amplifier to simplify the circuit structure of the power supply system 100. Alternatively, the first comparator unit 131 can also be a comparator unit or comparator circuit other than an operational amplifier, such as a comparator circuit formed by coupling two metal-oxide-semiconductor field-effect transistors (MOSFETs). The embodiments of this application do not further limit the specific form of the second comparator P2.

[0163] Figure 17The diagram illustrates the circuit topology of an electronic device provided for other embodiments of this application. In some examples, such as... Figure 17 As shown, the first voltage detection module 130 also includes an output unit 133. The output unit 133 is used to obtain the comparison result of the first comparison unit 131, and output a first power-off signal when the first comparison unit 131 determines that the AC power supply is in a power-off state.

[0164] For example, such as Figure 17 As shown, the output unit 133 may include a light-emitting diode (LED). The input terminal D11 of the LED is coupled to the output terminal P13 of the first comparison unit 131, and the output terminal D12 of the LED is grounded. When the first comparison unit 131 determines that the AC power supply has failed and outputs a high-level signal, the LED turns on. At this time, the LED emits light, and the first voltage detection module 130 outputs a first-level signal. Understandably, the first power failure signal is a light signal.

[0165] When the AC power supply is not interrupted, LED D1 is disconnected. At this time, the first voltage detection module 130 does not output the first level signal.

[0166] Alternatively, the output unit 133 can also be other types of switching transistors, such as metal-oxide-semiconductor field-effect transistors. Understandably, by adjusting the output unit 133, the first voltage detection module 130 can output different types of first power-down signals (e.g., optical signals or electrical signals) to meet different needs.

[0167] In other examples, the first voltage detection module 130 may not include the output unit 133. In this case, the output terminal P13 of the first comparison unit 131 can be used as the output terminal of the first voltage detection module 130, and the first power-down signal can be a high-level signal.

[0168] In some examples, such as Figure 15 As shown, logic module 150 includes a switch Q. When switch Q receives a first power-down signal or a second power-down signal, switch Q is turned on, and processor 201 receives a third power-down signal.

[0169] Understandably, including a switching transistor Q in the logic module 150 simplifies the structure of the logic module 150 and facilitates the miniaturization of the power supply system 100.

[0170] Taking the third power-down signal as a low-level signal as an example, the switching transistor Q can be coupled to the operating power supply VCC and the ground terminal, and the processor 201 is coupled between the switching transistor Q and the operating power supply VCC. Furthermore, the switching transistor Q can be coupled to the first voltage detection module 130 and the second voltage detection module 140 to receive the first power-down signal and the second power-down signal.

[0171] When the switching transistor Q receives the first power-down signal or the second power-down signal, the switching transistor Q turns on, and the operating power supply VCC is grounded through the switching transistor Q, so that the processor 201 can receive the third power-down signal, that is, the low-level signal.

[0172] In some examples, such as Figure 15 As shown, logic module 150 includes a first switch Q1. The first connection terminal Q11 of the first switch Q1 is coupled to the operating power supply VCC and the signal input terminal 2012 of the processor 201, and the second connection terminal Q12 of the first switch Q1 is grounded. The control terminal Q13 of the first switch Q1 is the first input terminal 1501 of logic module 150 and is coupled to the output terminal 1302 (e.g., output unit 133) of the first voltage detection module 130. When the first voltage detection module 130 outputs a first power-down signal, the first switch Q1 is turned on.

[0173] Understandably, when the AC power supply is not interrupted, the first switch Q1 is turned off, and the operating power supply VCC is coupled to the signal input terminal 2012 of the processor 201, allowing the signal input terminal 2012 of the processor 201 to receive a high-level signal. Conversely, when the AC power supply is interrupted, the first switch Q1 is turned on, grounding the operating power supply VCC, allowing the signal input terminal 2012 of the processor 201 to receive a low-level signal, i.e., the third power-down signal. The processor 201 executes the power-down sequence based on the low-level signal.

[0174] like Figure 17 As shown, when the output unit 133 includes a light-emitting diode (LED), the first switching transistor Q1 may include a phototransistor E. The collector E1 of the phototransistor E is the first connection terminal Q11 of the first switching transistor Q1, coupled to the operating power supply VCC and the signal input terminal 2012 of the processor 201. The emitter E2 of the phototransistor E is the second connection terminal Q12 of the first switching transistor Q1, coupled to the ground terminal. The base E3 of the phototransistor E is the control terminal Q13 of the first switching transistor Q1, coupled to the output terminal 1302 of the first voltage detection module 130 (e.g., output unit 133). When the LED D1 is turned on, the phototransistor E is turned on.

[0175] Understandably, the base E3 of phototransistor E can sense light signals. When LED D1 is turned on, phototransistor E is also turned on, grounding the operating power supply VCC, allowing the signal input terminal 2012 of processor 201 to receive a low-level signal, i.e., the third power-down signal. Processor 201 executes the power-down sequence based on the low-level signal.

[0176] Understandably, the light-emitting diode D1 and the phototransistor E can form an optocoupler module, which can isolate the high-voltage part and the low-voltage part of the power supply system 100, thereby improving the reliability of the power supply system 100.

[0177] Alternatively, the first switch Q1 may also include a metal-oxide-semiconductor field-effect transistor (MOSFET). For example, the first switch Q1 may include a P-channel MOSFET or an N-channel MOSFET.

[0178] Continue to refer to Figure 15 and Figure 17 In some examples, logic module 150 also includes a second switch Q2. The first connection terminal Q21 of the second switch Q2 is coupled to the operating power supply VCC2 and the signal input terminal 2012 of the processor 201, and the second connection terminal Q22 is grounded. The control terminal Q23 of the second switch Q2 is the second input terminal 1502 of logic module 150 and is coupled to the output terminal 1402 of the second voltage detection module 140. When the second voltage detection module 140 outputs a second power-down signal, the second switch Q2 is turned on.

[0179] When the AC power supply is not interrupted, the second switch Q2 is turned off, and the operating power supply VCC is coupled to the signal input terminal 2012 of the processor 201, allowing the signal input terminal 2012 of the processor 201 to receive a high-level signal. Conversely, when the AC power supply is interrupted, the second switch Q2 is turned on, grounding the operating power supply VCC, allowing the signal input terminal 2012 of the processor 201 to receive a low-level signal, i.e., the third power-down signal. The processor 201 executes the power-down sequence based on the low-level signal.

[0180] In some examples, the second switch Q2 includes a metal-oxide-semiconductor field-effect transistor (MOSFET). For example, the second switch Q2 may include a P-channel MOSFET or an N-channel MOSFET.

[0181] Understandably, taking the first switching transistor Q1 as an example, one of the first connection terminal Q11 and the second connection terminal Q12 of the first switching transistor Q1 is the source, and the other is the drain. The control terminal Q13 of the first switching transistor Q1 is the gate.

[0182] In some examples, such as Figure 15 and Figure 17As shown, the second voltage detection module 140 includes a second comparison unit 141. When the electronic device 200 is in a first operating state, the second comparison unit 141 compares a second voltage with a second reference voltage. If the second voltage is lower than the second reference voltage, the second comparison unit 141 determines that the AC power supply has been de-energized and outputs a second power-down signal.

[0183] Understandably, the voltage at the inverting input P21 of the second comparator unit 141 is the second voltage. For example, as... Figure 12 and Figure 14 As shown, the inverting input terminal P21 of the second comparator unit 141 is coupled to the output terminal 1402 of the buck module 140. The non-inverting input terminal P22 of the second comparator unit 141 is coupled to the reference power supply Vref, which provides a second reference voltage to the second comparator unit 141.

[0184] The power supply system 100 may include a second voltage divider unit (not shown in the figure). The second voltage divider unit is connected in series between the inverting input terminal P21 of the second comparator unit 141 and the second bus 102, and plays the role of voltage division, so that the voltage of the inverting input terminal P21 of the second comparator unit 141 (i.e. the second voltage) can be less than the voltage of the second bus 102, thereby reducing the risk of damage to the second comparator unit 141 due to excessively high voltage of the second bus 102.

[0185] Alternatively, a second voltage divider unit may not be provided between the inverting input terminal P21 of the second comparator unit 141 and the second bus 102. In this case, the voltage (i.e., the second voltage) at the inverting input terminal P21 of the second comparator unit 141 is equal to or approximately equal to the voltage of the second bus 102. Understandably, the voltage at the non-inverting input terminal P22 of the second comparator unit 141 is equal to or approximately equal to the second reference voltage.

[0186] For example, the reference power supply Vref can be a power supply located on the second circuit board 203 to provide a second reference voltage. With the second voltage divider unit provided, the voltage at the inverting input P21 of the second comparator unit 141 (i.e., the second voltage) is less than the voltage of the second bus 102, and the second reference voltage is less than a third voltage threshold. Without the second voltage divider unit provided, the voltage at the inverting input P21 of the second comparator unit 141 (i.e., the second voltage) is equal to or approximately equal to the voltage of the second bus 102, and the second reference voltage is equal to or approximately equal to the third voltage threshold. Understandably, when the second voltage is less than the second reference voltage, the second comparator unit 141 determines that the voltage of the second bus 102 is less than the third voltage threshold.

[0187] The power input terminal P24 of the second comparison unit 141 can be coupled to the second bus 102, so that the second bus 102 can supply power to the second comparison unit 141. Alternatively, the power input terminal P24 of the second comparison unit 141 can also be coupled to the power supply on the second circuit board 203. The embodiments of this application do not further limit this.

[0188] When the electronic device 200 is in the second operating state, the second comparison unit 141 compares the voltage of the inverting input terminal P21 (i.e., the second voltage) with the voltage of the non-inverting input terminal P22 (i.e., the second reference voltage). If the voltage of the inverting input terminal P21 (i.e., the second voltage) is less than the second reference voltage, the second comparison unit 141 determines that the AC power supply is off and outputs a high-level signal.

[0189] Conversely, if the voltage (i.e., the second voltage) at the inverting input terminal P21 of the second comparison unit 141 is greater than the second reference voltage, the second comparison unit 141 determines that the AC power supply has not been interrupted, and the second comparison unit 141 outputs a low-level signal.

[0190] By adopting the above configuration, the second comparison unit 141 can compare the second voltage with the second reference voltage when the electronic device 200 is in the second working state, thereby determining whether the AC power supply has failed. The logic is simple, no complex circuit structure is required, and the cost of the power supply system 100 is reduced.

[0191] For example, the second comparison unit 141 can be an operational amplifier to simplify the circuit structure of the power supply system 100. Alternatively, the second comparison unit 141 can also be a comparison unit or comparison circuit other than an operational amplifier, such as a comparison circuit formed by two MOSFETs coupled together. The embodiments of this application do not further limit the specific form of the second comparison unit 141.

[0192] Continue to refer to Figure 17 In some examples, the power supply system 100 also includes a first energy storage capacitor C1 and a second energy storage capacitor C2. The first energy storage capacitor C1 is coupled between the AC-DC conversion module 110 and the step-down module 120, and the second energy storage capacitor C2 is coupled to the output terminal 1202 of the step-down module 120.

[0193] For example, one electrode plate of the first energy storage capacitor C1 is coupled to the first bus 101, and the other electrode plate is grounded. One electrode plate of the second energy storage capacitor C2 is coupled to the second bus 102, and the other electrode plate is grounded.

[0194] Understandably, when the AC power supply is not interrupted, the first bus 101 can store energy for the first energy storage capacitor C1, and the second bus 102 can store energy for the second energy storage capacitor C2. When the AC power supply is interrupted, the first energy storage capacitor C1 and the second energy storage capacitor C2 can discharge to supply power to the processor 201, thus meeting the requirements of the processor 201 to execute the power-down sequence.

[0195] In some examples, the capacitance of the first energy storage capacitor C1 is 200 microfarads, and the capacitance of the second energy storage capacitor C2 is 2000 microfarads.

[0196] This configuration ensures that the first energy storage capacitor C1 and the second energy storage capacitor C2 provide sufficient energy to the processor 201 after the AC power supply fails, reducing the risk of the processor 201 losing power before the power-down sequence is completed. Furthermore, it reduces the energy consumption of the first energy storage capacitor C1 and the second energy storage capacitor C2 when the electronic device 200 is in its second operating state, ensuring that the power consumption of the electronic device 200 in the second operating state is less than or equal to 0.5W, thus meeting the standby energy efficiency requirements of the electronic device 200.

[0197] For example, when the electronic device 200 is in its first operating state, the power of the first energy storage capacitor C1 and the second energy storage capacitor C2 can be approximately 18W. When the second electronic device 200 is in its second operating state, the power of the first energy storage capacitor C1 and the second energy storage capacitor C2 can be approximately 300mW (milliwatts).

[0198] Understandably, the capacitance values ​​of the first energy storage capacitor C1 and the second energy storage capacitor C2 can also be other values, and the embodiments of this application do not further limit this.

[0199] As can be seen from the above, the first voltage detection module 130 can be coupled to the input terminal 1101 or the output terminal 1102 of the AC-DC conversion module 110.

[0200] Figure 18 This is a schematic block diagram of the structure of an electronic device provided in some embodiments of this application. In some examples, such as... Figure 18 As shown, the first voltage detection module 130 can be coupled to the output terminal 1202 (second bus 102) of the step-down module 120. Furthermore, the coupling position of the first voltage detection module 130 to the second bus 102 is closer to the output terminal 1202 of the step-down module 120 than the coupling position of the second voltage detection module 140 to the second bus 102, allowing the second voltage to be lower than the first voltage.

[0201] Understandably, both the first voltage detection module 130 and the second voltage detection module 140 are coupled to the second bus 102, which can reduce the power consumption of the electronic device 200 and facilitate the realization of low power consumption of the electronic device 200 in the second working state (e.g., standby state), so that the power of the electronic device 200 in the second working state can be less than or equal to 0.5W, thus meeting the standby energy efficiency requirements of the electronic device 200.

[0202] When the AC power supply fails, the voltage at the coupling point between the second bus 102 and the first voltage detection module 130 will drop below the third voltage threshold before the voltage at the coupling point between the second bus 102 and the second voltage detection module 140. This allows the first voltage detection module 130 to send a power-down signal before the second voltage detection module 140, so that the processor 201 can receive the first power-down signal first and then the second power-down signal.

[0203] For example, the processor 201 can execute a higher priority power-down sequence (e.g., storing data in memory) based on a first power-down signal, and execute a lower priority power-down sequence (e.g., shutting down other devices of the electronic device 200) based on a second power-down signal, ensuring that the higher priority power-down sequence can be completed before the processor 201 is powered down, thereby improving the reliability of the electronic device 200.

[0204] Continue to refer to Figure 18 In some examples, the power supply system 100 also includes a diode D2 and a third energy storage capacitor C3. Diode D2 is disposed on the second bus 102, with its input terminal D21 coupled to the output terminal 1101 of the AC-DC converter module 110, and its output terminal D22 coupled to the input terminal 1201 of the step-down module 120. The third energy storage capacitor C3 is coupled to the output terminal D22 of diode D2. For example, one electrode of the third energy storage capacitor C3 is coupled to the output terminal D22 of diode D2, and the other electrode of the third energy storage capacitor C3 is grounded.

[0205] Understandably, when the AC power supply is not interrupted, the third energy storage capacitor C3 can store energy. When the AC power supply is interrupted, the third energy storage capacitor C3 discharges, supplying power to the processor 201 and meeting the power-down timing requirements of the processor 201. Furthermore, the diode D2 can restrict the direction of the discharge current of the third energy storage capacitor C3, reducing the risk of the discharge current of the third energy storage capacitor C3 flowing to the buck module 120.

[0206] In summary, the embodiments of this application have at least the following beneficial effects:

[0207] The first voltage detection module 130 can be coupled to a higher voltage location, and the second voltage detection module 140 can be coupled to a lower voltage location, such that the second voltage is lower than the first voltage. For example, the first voltage detection module 130 may include a first voltage divider unit. The second voltage detection module 140 may or may not include a second voltage divider unit. Understandably, the second voltage being lower than the first voltage ensures that the power consumption of the second voltage detection module 140 is lower than that of the first voltage detection module 130.

[0208] When the AC power supply fails, the voltage at the higher voltage level drops first. After the voltage at the higher voltage level drops to a certain value, the voltage at the lower voltage level begins to drop. Therefore, when the electronic device 200 is in its first operating state, the first voltage detection module 130 operates. The first voltage detection module 130 can determine the AC power supply status based on the first voltage, enabling it to quickly obtain the AC power supply status and shortening the time required for it to identify the AC power failure. This provides sufficient time for the processor 201 to execute the power-down sequence, meeting the requirements of the processor 201's power-down sequence execution.

[0209] When the electronic device 200 is in its first operating state, the second voltage detection module 140 can operate, eliminating the need for a switch structure to turn the second voltage detection module 140 off, thus simplifying the structure of the power supply system 100. Alternatively, the second voltage detection module 140 can also be deactivated, thereby reducing power consumption when the electronic device 200 is in its first operating state. This application's embodiment uses the operation of the second voltage detection module 140 when the electronic device 200 is in its first operating state as an example for further illustration.

[0210] When the electronic device 200 is in the second working state, the first voltage detection module 140 stops working and the second voltage detection module 140 works, which can reduce the power consumption of the electronic device 200 in the second working state, which is conducive to achieving low power consumption of the electronic device 200 in the second working state, so that the power of the electronic device 200 in the second working state can be less than or equal to 0.5W, thus meeting the standby energy efficiency requirements of the electronic device 200.

[0211] Furthermore, when the electronic device 200 is in its second operating state, the second voltage detection module 140 can determine the AC power supply status based on the second voltage, enabling the processor 201 to obtain power-down information. Understandably, when the electronic device 200 is in its second operating state, its operating power is relatively low, and the time from the second detection module 140 issuing the second power-down signal to the processor 201 ceasing normal operation is greater than 100ms, meeting the requirements of the processor 201's power-down timing.

[0212] In other words, the embodiments of this application configure the power supply system 100 to include a first voltage detection module 130 and a second voltage detection module 140. When the electronic device 200 is in a high power consumption state, the first voltage detection module 130 determines the AC power supply state based on a first voltage; when the electronic device 200 is in a low power consumption state, the second voltage detection module 140 determines the AC power supply state based on a second voltage. This allows the first voltage detection module 130 and the second voltage detection module 140 to match the two different operating states of the electronic device 200, automatically detecting the AC power supply state in both high and low power consumption scenarios, and simultaneously meeting the timeliness and power consumption requirements for power failure detection.

[0213] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply system (100), characterized in that, It includes a first voltage detection module (130) and a second voltage detection module (140); the input voltage of the first voltage detection module (130) is a first voltage, and the input voltage of the second voltage detection module (140) is a second voltage, wherein the second voltage is less than the first voltage; The first voltage detection module (130) is used to: detect the power supply status of the AC power supply when the electronic device (200) is in a first working state, and output a first power-off signal when the AC power supply is in a power-off state. The second voltage detection module (140) is used to: detect the power supply status of the AC power supply when the electronic device (200) is in the second working state, and output a second power-off signal when the AC power supply is in the power-off state; The power of the electronic device (200) in the second operating state is less than the power of the electronic device (200) in the first operating state.

2. The power supply system (100) according to claim 1, characterized in that, It also includes a logic module (150); when the electronic device (200) is in the first working state, the logic module (150) receives the first power-down signal and outputs a third power-down signal based on the first power-down signal; when the electronic device (200) is in the second working state, the logic module (150) receives the second power-down signal and outputs the third power-down signal based on the second power-down signal.

3. The power supply system (100) according to claim 2, characterized in that, The electronic device (200) includes a processor (201) that executes a power-down sequence based on the third power-down signal.

4. The power supply system (100) according to claim 3, characterized in that, When the electronic device (200) is in the second working state, the processor (201) outputs a standby signal to the first voltage detection module (130), and the first voltage detection module (130) stops working based on the standby signal.

5. The power supply system (100) according to claim 4, characterized in that, The processor (201) includes a first processor (201a) and a second processor (201b); the logic module (150) is used to send the third power-down signal to the first processor (201a) and the second processor (201b); One of the first processor (201a) and the second processor (201b) executes the power-down sequence based on the third power-down signal.

6. The power supply system (100) according to claim 5, characterized in that, When the electronic device (200) is in the second operating state, one of the first processor (201a) and the second processor (201b) sends the standby signal to the first voltage detection module (130).

7. The power supply system (100) according to claim 5 or 6, characterized in that, The first processor (201a) includes a video chip (201a1); or, the first processor (201a) includes a video chip (201a1) and a microcontroller unit (201a2); the second processor (201b) includes an artificial intelligence chip (201b1).

8. The power supply system (100) according to any one of claims 4 to 7, characterized in that, The first voltage detection module (130) includes a first comparison unit (131) and an auxiliary power supply (132); When the electronic device (200) is in the first working state, the first comparison unit (131) is used to compare the first voltage and the first reference voltage. When the first voltage is less than the first reference voltage, the first comparison unit (131) determines that the AC power supply is off. The auxiliary power supply (132) is used to power the first comparison unit (131); when the electronic device (200) is in the second working state, the processor (201) sends a standby signal to the auxiliary power supply (132), and the auxiliary power supply (132) stops supplying power based on the standby signal.

9. The power supply system (100) according to claim 8, characterized in that, The first voltage detection module (130) further includes an output unit (133); the output unit (133) is used to obtain the comparison result of the first comparison unit (131), and output the first power-off signal when the first comparison unit (131) determines that the AC power supply (AC) is in the power-off state.

10. The power supply system (100) according to any one of claims 3 to 9, characterized in that, The logic module (150) includes a switching transistor (Q); When the switch (Q) receives the first power-down signal or the second power-down signal, the switch (Q) is turned on, and the processor (201) receives the third power-down signal.

11. The power supply system (100) according to any one of claims 1 to 10, characterized in that, The second voltage detection module (140) includes a second comparison unit (141); When the electronic device (200) is in the first working state, the second comparison unit (141) is used to compare the second voltage and the second reference voltage; when the second voltage is less than the second reference voltage, the second comparison unit (141) determines that the AC power supply (AC) is off and outputs the second power-off signal.

12. The power supply system (100) according to any one of claims 1 to 11, characterized in that, It also includes an AC-DC converter module (110) and a step-down module (120), which are coupled together; The first voltage is the input voltage of the AC-DC converter module (110); or, the first voltage is the output voltage of the AC-DC converter module (110); the second voltage is the output voltage of the step-down module (120).

13. The power supply system (100) according to claim 12, characterized in that, It also includes a first energy storage capacitor (C1) and a second energy storage capacitor (C2); the first energy storage capacitor (C1) is coupled between the AC-DC conversion module (110) and the step-down module (120), and the second energy storage capacitor (C2) is coupled to the output terminal (1202) of the step-down module (120).

14. The power supply system (100) according to claim 13, characterized in that, The first energy storage capacitor (C1) has a capacitance of 200 microfarads, and the second energy storage capacitor (C2) has a capacitance of 2000 microfarads.

15. The power supply system (100) according to any one of claims 1 to 14, characterized in that, The first working state is the normal working state, and the second working state is the standby state.

16. An electronic device (200), characterized in that, include: The power supply system (100) as described in any one of claims 1 to 15; The processor (201) is coupled to the power supply system (100).

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