Extended power-off alarm time circuit, communication system and electronic product

Abstract

This application provides a circuit, communication system, and electronic product for extending the power outage alarm time. The circuit includes a unidirectional conduction unit and an energy storage unit, which are electrically connected. In practical use, the first terminal of the unidirectional conduction unit is electrically connected to both the power supply module and the step-down module, while the energy storage unit is electrically connected to the signal processing module. When the power supply module loses power, the energy storage unit begins to release its stored energy to power the downstream modules. Because the unidirectional conduction unit has unidirectional conduction characteristics, it can prevent the energy storage unit from releasing energy to the step-down module, ensuring that the energy storage unit only releases energy to the signal processing module, thus avoiding additional energy consumption by the step-down module. This extends the effective power supply time for the signal processing module, thereby extending the power outage alarm time and meeting the requirement for reliable reporting of power outage alarm signals.

Description

Technical Field

[0001] This application belongs to the field of optical communication technology, and in particular relates to a circuit for extending power failure alarm time, a communication system, and an electronic product. Background Technology

[0002] In the field of optical communication technology, it is essential to promptly report power failure alarm signals after the optical modem loses power to ensure real-time monitoring of equipment status by the communication system. However, in traditional circuit designs, the effective power supply time for the signal processing module used to maintain power failure alarm signal reporting is relatively short after the optical modem loses power, making it difficult to meet the requirement of reliable reporting of power failure alarm signals. Utility Model Content

[0003] This application provides a circuit, communication system, and electronic product for extending the power failure alarm time. It can solve the problem that in traditional circuit designs, the signal processing module has a short effective power supply time after the optical modem is powered off, making it difficult to meet the requirement of reliable reporting of power failure alarm signals.

[0004] In a first aspect, embodiments of this application provide a circuit for extending the power failure alarm time, including a unidirectional conduction unit and an energy storage unit. The unidirectional conduction unit is electrically connected to the energy storage unit. The unidirectional conduction unit is used to be electrically connected to a power supply module and a step-down module, respectively. The energy storage unit is used to be electrically connected to a signal processing module.

[0005] When the power supply module is de-energized, the unidirectional conduction unit is used to prevent the energy storage unit from releasing energy to the step-down module; the energy storage unit is used to release energy to the signal processing module.

[0006] In one possible implementation of the first aspect, the unidirectional conduction unit includes a first diode, the anode of which is electrically connected to the power supply module and the step-down module respectively, and the cathode of which is electrically connected to the energy storage unit.

[0007] In one possible implementation of the first aspect, the energy storage unit includes a first capacitor, a first terminal of which is electrically connected to the unidirectional conduction unit and the signal processing module, respectively, and a second terminal of the first capacitor is grounded.

[0008] In one possible implementation of the first aspect, the first capacitor is an electrolytic capacitor.

[0009] In one possible implementation of the first aspect, the extended power failure alarm time circuit further includes a first filter capacitor, the first end of which is electrically connected to the energy storage unit and the signal processing module respectively, and the second end of which is grounded.

[0010] In one possible implementation of the first aspect, the extended power failure alarm time circuit further includes a second filter capacitor, the first end of which is electrically connected to the unidirectional conduction unit and the power supply module, and the second end of which is grounded.

[0011] In a second aspect, embodiments of this application provide a communication system, including a power supply module, a step-down module, a signal processing module, and an extended power failure alarm time circuit as described in the first aspect. The power supply module is electrically connected to the unidirectional conduction unit in the step-down module and the extended power failure alarm time circuit, respectively, and the signal processing module is electrically connected to the energy storage unit in the extended power failure alarm time circuit.

[0012] The power supply module is used to output power supply voltage to the step-down module and the unidirectional conduction unit; the step-down module is used to output a step-down voltage according to the power supply voltage; the signal processing module is used to receive the energy output by the energy storage unit when the power supply module is powered off, and output a power failure alarm signal.

[0013] In one possible implementation of the second aspect, the step-down module includes a first filter unit, a voltage conversion unit, and a second filter unit. The voltage conversion unit is electrically connected to the first filter unit and the second filter unit, respectively. Both the first filter unit and the voltage conversion unit are electrically connected to the power supply module.

[0014] The first filtering unit is used to filter out high-frequency components in the supply voltage; the voltage conversion unit is used to output the step-down voltage according to the supply voltage; and the second filtering unit is used to filter out high-frequency components in the step-down voltage.

[0015] In one possible implementation of the second aspect, the voltage conversion unit includes a voltage conversion chip, a first resistor, a second resistor, a third resistor, and a fourth resistor. The first pin of the voltage conversion chip is electrically connected to the first end of the first resistor, the first filter unit, and the power supply module, respectively. The second pin of the voltage conversion chip is electrically connected to the second end of the first resistor and the first end of the second resistor, respectively. The second end of the second resistor is grounded. The third pin of the voltage conversion chip is electrically connected to the second filter unit. The fourth pin of the voltage conversion chip is electrically connected to the first end of the third resistor and the first end of the fourth resistor, respectively. The second end of the third resistor is electrically connected to the second filter unit, and the second end of the fourth resistor is grounded.

[0016] Thirdly, embodiments of this application provide an electronic product including the communication system described in any one of the second aspects.

[0017] The beneficial effects of the embodiments in this application compared with the prior art are:

[0018] The extended power failure alarm time circuit provided in this application embodiment includes a unidirectional conduction unit and an energy storage unit, which are electrically connected. In actual use, the first end of the unidirectional conduction unit is electrically connected to both the power supply module and the step-down module, and the energy storage unit is electrically connected to the signal processing module. When the power supply module is working normally, it can output a power supply voltage. This voltage can be transmitted to the energy storage unit through the unidirectional conduction unit, where it stores energy. When the power supply module is powered off, the energy storage unit begins to release the stored energy to power the downstream modules. Because the unidirectional conduction unit has unidirectional conduction characteristics, it can prevent the energy storage unit from releasing energy to the step-down module, ensuring that the energy storage unit only releases energy to the signal processing module, thus avoiding additional energy consumption by the step-down module. Therefore, the extended power failure alarm time circuit provided in this application embodiment, by adding a unidirectional conduction unit, can prevent the energy storage unit from releasing energy to the step-down module after the power supply module is powered off, thereby preventing the step-down module from consuming the energy stored in the energy storage unit. This extends the effective power supply time for the signal processing module, thereby extending the power failure alarm time and meeting the requirement for reliable reporting of power failure alarm signals. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a circuit connection diagram of a traditional circuit for extending the power failure alarm time;

[0021] Figure 2 This is a schematic block diagram of a circuit for extending the power failure alarm time provided in an embodiment of this application;

[0022] Figure 3 This is a circuit connection diagram of an embodiment of the circuit for extending the power failure alarm time provided in this application;

[0023] Figure 4 This is a schematic block diagram of a communication system provided in an embodiment of this application;

[0024] Figure 5 This is a circuit connection diagram of a step-down module provided in one embodiment of this application.

[0025] In the diagram: 10, Extended power failure alarm time circuit; 101, Unidirectional conduction unit; 102, Energy storage unit; 20, Power supply module; 30, Step-down module; 301, First filter unit; 302, Voltage conversion unit; 303, Second filter unit; 40, Signal processing module. Detailed Implementation

[0026] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0027] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0028] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [the described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [the described condition or event] is detected," or "in response to detection of [the described condition or event]."

[0029] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0031] In the field of optical communication technology, it is essential to promptly report power failure alarm signals after a power outage of the optical modem to ensure real-time monitoring of the equipment status by the communication system. However, as... Figure 1 As shown in the traditional circuit design, after the optical modem loses power, the energy stored in the energy storage units (PEC1 and PEC2) flows simultaneously to the signal processing module and the buck module through PR1. Since the buck module consumes some of the energy from the energy storage units, this directly results in a short effective power supply time for the signal processing module, which is used to maintain the reporting of power failure alarm signals, making it difficult to meet the requirement of reliable reporting of power failure alarm signals.

[0032] Based on the above problems, the extended power failure alarm time circuit provided in this application embodiment includes a unidirectional conduction unit and an energy storage unit, with the unidirectional conduction unit electrically connected to the energy storage unit. In actual use, the first end of the unidirectional conduction unit is electrically connected to both the power supply module and the step-down module, and the energy storage unit is electrically connected to the signal processing module. When the power supply module is working normally, it can output a power supply voltage. This voltage can be transmitted to the energy storage unit through the unidirectional conduction unit, where it stores energy. When the power supply module is powered off, the energy storage unit begins to release the stored energy to power the downstream modules. Because the unidirectional conduction unit has unidirectional conduction characteristics, it can prevent the energy storage unit from releasing energy to the step-down module, ensuring that the energy storage unit only releases energy to the signal processing module, thus avoiding additional energy consumption by the step-down module. Therefore, the extended power failure alarm time circuit provided in this application embodiment, by adding a unidirectional conduction unit, can prevent the energy storage unit from releasing energy to the step-down module after the power supply module is powered off, thereby preventing the step-down module from consuming the energy stored in the energy storage unit. This extends the effective power supply time for the signal processing module, thereby extending the power failure alarm time and meeting the requirement for reliable reporting of power failure alarm signals.

[0033] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0034] Figure 2 A schematic block diagram of an extended power failure alarm time circuit 10 according to an embodiment of this application is shown. See also Figure 2 As shown, the extended power failure alarm time circuit 10 includes a unidirectional conduction unit 101 and an energy storage unit 102. The unidirectional conduction unit 101 is electrically connected to the energy storage unit 102. The unidirectional conduction unit 101 is used to be electrically connected to the power supply module 20 and the step-down module 30 respectively. The energy storage unit 102 is used to be electrically connected to the signal processing module 40.

[0035] Specifically, when the power supply module 20 is working normally, it can output a supply voltage VIN. The supply voltage VIN can be transmitted to the energy storage unit 102 through the unidirectional conduction unit 101, where the energy storage unit 102 stores energy. When the power supply module 20 is powered off, the energy storage unit 102 begins to release the stored energy to power the downstream modules. Because the unidirectional conduction unit 101 has unidirectional conduction characteristics, it can prevent the energy storage unit 102 from releasing energy to the buck module 30, allowing the energy storage unit 102 to release energy only to the signal processing module 40, thus avoiding additional consumption of the energy stored in the energy storage unit 102 by the buck module 30. Therefore, the extended power failure alarm time circuit 10 provided in this embodiment, by adding the unidirectional conduction unit 101, can prevent the energy storage unit 102 from releasing energy to the buck module 30 after the power supply module 20 is powered off, thereby preventing the buck module 30 from consuming the energy stored in the energy storage unit 102. This extends the effective power supply time for the signal processing module 40, thereby extending the power failure alarm time and meeting the requirement for reliable reporting of power failure alarm signals.

[0036] It should be noted that the step-down module 30 can output a step-down voltage VDD based on the power supply voltage VIN output by the power supply module 20 to power the network communication products. The signal processing module 40 can output a power failure alarm signal when the power supply module 20 loses power, ensuring that the signal can be uploaded to the communication system in a timely manner, realizing remote reporting of the power failure status of the equipment.

[0037] For example, the maximum input voltage of the power supply module 20 can be 18V, and the output power supply voltage VIN can be 12V. The step-down module 30 steps down the 12V to 5V to power circuits in networking products that require 5V power, such as modules with USB (Universal Serial Bus) or FEM (Front-End Module) functions. At the same time, the DC voltage VinDC at the common terminal of the energy storage unit 102 and the unidirectional conduction unit 101 is specifically used to provide power to the core components in the signal processing module 40 (such as the CPU (Central Processing Unit), SOC (System on Chip), etc.), and can be adapted to devices with different voltage requirements such as 3.3V, 1.0V, and 0.9V.

[0038] In one embodiment of this application, such as Figure 3 As shown, the unidirectional conduction unit 101 includes a first diode PD1. The anode of the first diode PD1 is used to be electrically connected to the power supply module 20 and the step-down module 30 respectively, and the cathode of the first diode PD1 is electrically connected to the energy storage unit 102.

[0039] Specifically, the first diode PD1, as the core component of the unidirectional conduction unit 101, has its anode connected to the power supply module 20 and the step-down module 30, and its cathode connected to the energy storage unit 102. This connection method fully utilizes the unidirectional conductivity characteristic of the diode. When the power supply module 20 is working normally, the supply voltage VIN can flow from the anode to the cathode, successfully charging the energy storage unit 102 and ensuring that the energy storage unit 102 stores sufficient energy during the normal power supply phase. When the power supply module 20 is de-energized, the first diode PD1 reverse-biased cutoff effectively blocks the energy stored in the energy storage unit 102 from being transferred to the step-down module 30 through the first diode PD1. This prevents the step-down module 30 from consuming the energy of the energy storage unit 102, ensuring that the electrical energy stored in the energy storage unit 102 can only be delivered to the signal processing module 40. This ensures that the signal processing module 40 has a longer effective power supply time after a power outage, meeting the requirement for reliable reporting of power outage alarm signals.

[0040] For example, the designer can select the model of the first diode PD1, for instance, the model of the first diode PD1 can be selected as SBR3A40SA.

[0041] It should be noted that the unidirectional conduction unit 101 can also adopt other circuit structures, as long as it can prevent the energy storage unit 102 from releasing energy to the buck module 30 after the power supply module 20 is powered off. The unidirectional conduction unit 101 may include a unidirectional thyristor, which is controlled to conduct by a trigger signal. Once conducted, it can maintain conduction even if the trigger signal disappears, and only turns off when the current is lower than the holding current, thus possessing unidirectional conductivity. The unidirectional conduction unit 101 may also include a unidirectional conduction circuit composed of field-effect transistors, utilizing the switching characteristics of N-channel or P-channel MOSFETs in conjunction with a drive circuit to achieve unidirectional conduction. By detecting the voltage direction, the gate voltage is controlled, so that the MOSFET only conducts under forward voltage and turns off under reverse voltage. Furthermore, the unidirectional conduction unit 101 may also include a solid-state relay or other switching devices, where energy transfer can only be achieved when the switching device is turned on.

[0042] In low-voltage, low-power circuits such as those used in networking products, where simplicity and reliability are paramount, diodes remain the optimal choice (low cost, simple structure, and no additional driver required). If reducing conduction losses or meeting high current demands is required, unidirectional conduction circuits using MOSFETs can be considered.

[0043] In one embodiment of this application, such as Figure 3 As shown, the energy storage unit 102 includes a first capacitor PEC1. The first end of the first capacitor PEC1 is electrically connected to the unidirectional conduction unit 101 and the signal processing module 40, respectively, and the second end of the first capacitor PEC1 is grounded.

[0044] Specifically, the first capacitor PEC1, as the core component of the energy storage unit 102, is mainly used for storing and releasing energy. When the power supply module 20 is operating normally, the supply voltage VIN charges the first capacitor PEC1 through the first diode PD1, allowing it to store sufficient electrical energy. When the power supply module 20 is powered off, the first capacitor PEC1 releases the stored electrical energy through its connection to the signal processing module 40, continuously supplying power to the signal processing module 40. Simultaneously, due to the unidirectional conduction and isolation effect of the first diode PD1, the energy of the first capacitor PEC1 flows only to the signal processing module 40 and is not consumed by the step-down module 30, thus ensuring that the signal processing module 40 has a sufficiently long power supply time after a power outage, ensuring the reliable generation and reporting of the power outage alarm signal. This design cleverly solves the problem of power supply continuity at the moment of power outage through the energy storage characteristics of the first capacitor PEC1, making it a key energy storage component for extending the power outage alarm time.

[0045] It should be noted that the first capacitor, PEC1, is an electrolytic capacitor. Its core advantage lies in its ability to provide a large capacitance in a small size, efficiently storing sufficient electrical energy to meet the power supply duration requirements of the signal processing module 40 after a power outage. Simultaneously, electrolytic capacitors have low equivalent series resistance, stable charging and discharging performance, and can quickly release energy upon power failure, providing continuous and stable voltage support for the signal processing module 40, ensuring the reliable generation and transmission of power failure alarm signals. Furthermore, electrolytic capacitors are highly adaptable to low-voltage DC circuits, have relatively controllable costs, and are highly compatible with the energy storage requirements of networking products and other scenarios, making them an ideal choice that balances energy storage efficiency, stability, and economy.

[0046] For example, the designer can select the capacitance value of the first capacitor PEC1, for instance, the capacitance value of the first capacitor PEC1 can be selected as 1000uF.

[0047] It should be noted that in traditional circuit designs, due to the lack of a diode with unidirectional conduction characteristics, when the power supply module 20 is powered off, both the step-down module 30 and the signal processing module 40 consume energy from the energy storage unit 102 simultaneously, leading to faster energy consumption and affecting the time of power failure alarm reporting. To store sufficient energy to meet basic power supply requirements, the energy storage unit 102 typically needs to include at least two 1000uF electrolytic capacitors (PEC1 and PEC2), which undoubtedly increases the overall design cost of the circuit and expands the PCB (Printed Circuit Board) space required for multiple capacitor layouts. This application cleverly adds a first diode PD1, utilizing its unidirectional conduction characteristics to block the release of ineffective energy from the energy storage unit 102 to the step-down module 30, ensuring that all the energy from the energy storage unit 102 can be supplied to the signal processing module 40. Based on this optimization, only one electrolytic capacitor is needed to meet the power supply requirements for the power failure alarm, eliminating the need to increase the number of capacitors. This design not only significantly reduces the procurement cost of capacitor components, but also simplifies the circuit layout, reduces the space occupied on the PCB board, and avoids the consistency problems that may be caused by multiple capacitors in parallel. It further reduces the overall design and production costs while improving circuit reliability.

[0048] In one embodiment of this application, such as Figure 3 As shown, the extended power failure alarm time circuit 10 also includes a first filter capacitor PC1. The first end of the first filter capacitor PC1 is electrically connected to the energy storage unit 102 and the signal processing module 40, respectively, and the second end of the first filter capacitor PC1 is grounded.

[0049] Specifically, the first filter capacitor PC1 is used to stabilize the voltage (i.e., DC voltage VinDC) output from the energy storage unit 102 to the signal processing module 40. When the power supply module 20 is operating normally, the first filter capacitor PC1 can filter out high-frequency noise and transient interference in the circuit, ensuring a smooth and stable voltage input to the signal processing module 40. When the power supply module 20 is powered off, voltage fluctuations may occur due to load changes during the energy release process of the energy storage unit 102. At this time, the first filter capacitor PC1 can quickly absorb these fluctuations through charging and discharging, maintaining the stability of the DC voltage VinDC. This prevents the signal processing module 40 from malfunctioning due to voltage instability (such as alarm signal distortion or interruption), thereby ensuring the continuous and reliable generation and transmission of power failure alarm signals and further improving the stability of the circuit under complex operating conditions.

[0050] For example, the designer can select the capacitance value of the first filter capacitor PC1. For instance, the capacitance value of the first filter capacitor PC1 can be selected as 0.1uF.

[0051] In one embodiment of this application, such as Figure 3 As shown, the extended power failure alarm time circuit 10 also includes a second filter capacitor PC2. The first end of the second filter capacitor PC2 is electrically connected to the unidirectional conduction unit 101 and the power supply module 20, respectively, and the second end of the second filter capacitor PC2 is grounded.

[0052] Specifically, the second filter capacitor PC2 mainly functions to stabilize the supply voltage VIN and suppress interference. When the power supply module 20 is operating normally, its output supply voltage VIN may generate high-frequency ripple due to grid fluctuations or its own switching action. The second filter capacitor PC2 can quickly absorb these ripple signals through charging and discharging, filtering out high-frequency noise in the circuit and ensuring that the supply voltage VIN input to the unidirectional conduction unit 101 and the step-down module 30 is smooth and stable, providing a clean voltage foundation for the efficient charging of the energy storage unit 102. When the power supply module 20 is about to be de-energized or is in a transitional state at the moment of power de-energization, instantaneous voltage changes may occur in the circuit. The second filter capacitor PC2 can effectively buffer these changes, reducing the impact of voltage fluctuations on the unidirectional conduction unit 101 and subsequent circuits, ensuring the stability of the circuit during power supply state switching, and indirectly providing a more reliable operating environment for the energy storage and release of the energy storage unit 102.

[0053] For example, the designer can select the capacitance value of the second filter capacitor PC2. For instance, the capacitance value of the second filter capacitor PC2 can be selected as 0.1uF.

[0054] In one embodiment of this application, such as Figure 4 As shown, the communication system includes a power supply module 20, a step-down module 30, a signal processing module 40, and the aforementioned extended power failure alarm time circuit 10. The power supply module 20 is electrically connected to the unidirectional conduction unit 101 in the step-down module 30 and the extended power failure alarm time circuit 10, respectively. The signal processing module 40 is electrically connected to the energy storage unit 102 in the extended power failure alarm time circuit 10.

[0055] Specifically, the power supply module 20, as the main power input component of the communication system, can process the externally input power (such as the voltage converted from AC mains power by an adapter) into a stable supply voltage VIN (e.g., 12V), and simultaneously output the supply voltage VIN to the buck module 30 and the unidirectional conduction unit 101 in the extended power failure alarm time circuit 10. That is, when the power supply module 20 is working normally, it not only provides energy to the conventional circuits of the equipment, but also replenishes the energy storage unit 102 through the unidirectional conduction unit 101.

[0056] As the core of voltage conversion, the step-down module 30 receives the power supply voltage VIN output by the power supply module 20 and converts it into the step-down voltage VDD (e.g., 5V) required by other auxiliary functional modules of the equipment through its internal transformer circuit. This ensures that these auxiliary modules obtain the appropriate operating voltage when the equipment is running normally, and maintains the complete functionality of the equipment.

[0057] As the core execution component of the power failure alarm, the signal processing module 40 directly supplies operating voltage to the power supply module 20 when it is working normally. In this case, it monitors the output status of the power supply module 20 in real time (e.g., determining whether the power supply is normal through a voltage detection circuit). When the power supply module 20 loses power, its power supply path automatically switches to the energy storage unit 102 in the extended power failure alarm time circuit 10. The energy released by the energy storage unit 102 is transferred to the signal processing module 40, providing it with continuous power. In this state, the signal processing module 40 immediately activates a preset alarm program, quickly generating a power failure alarm signal containing information such as device identification and power failure time. This signal is then uploaded to the upper-level management system via the device's communication interface (e.g., optical port, network port) until the energy of the energy storage unit 102 is exhausted, thus achieving reliable reporting of the power failure status.

[0058] In one embodiment of this application, such as Figure 3 As shown, the power supply module 20 includes an interface PJ1, a switching switch PSW1, and an input filter capacitor PC38. The interface PJ1 serves as the external power input port, responsible for introducing externally input power (such as the voltage output from a mains adapter or DC power) into the power supply module. It is the physical interface for the entire device to obtain power, and its specifications must match the external power supply to ensure a reliable connection. The switching switch PSW1 acts as the power supply on / off control component, allowing manual or automatic control of the connection status between the power supply module and the external power supply. For example, it can cut off the power supply during equipment maintenance or abnormal situations, playing a role in safety protection and power management. The input filter capacitor PC38 is connected between the interface PJ1 and the switching switch PSW1, used to filter out high-frequency noise, grid ripple, and transient interference introduced by the external power supply, providing a clean power foundation for subsequent circuits (such as step-down modules and unidirectional conduction units), and ensuring the stable operation of the entire power supply system.

[0059] In one embodiment of this application, such as Figure 5 As shown, the step-down module 30 includes a first filter unit 301, a voltage conversion unit 302, and a second filter unit 303. The voltage conversion unit 302 is electrically connected to the first filter unit 301 and the second filter unit 303, respectively. Both the first filter unit 301 and the voltage conversion unit 302 are electrically connected to the power supply module 20.

[0060] Specifically, the first filtering unit 301, as the front-end preprocessing unit of the step-down module 30, directly receives the power supply voltage VIN output by the power supply module 20. It can effectively filter out high-frequency interference signals mixed in the power supply voltage VIN (such as ripple generated by power grid fluctuations, noise introduced by circuit switching operations, etc.), making the voltage input to the subsequent voltage conversion unit 302 smoother and more stable, providing a clean power supply voltage VIN for the voltage conversion process, and avoiding the influence of high-frequency components on conversion accuracy and stability.

[0061] The voltage conversion unit 302 is the core transformer component of the step-down module 30. It can accurately convert the supply voltage VIN (e.g., 12V) processed by the first filter unit 301 into the step-down voltage VDD (e.g., 5V) required by the auxiliary modules of the communication system (e.g., USB interface, indicator light circuit, etc.), and has a stable output capability. Even if there are small fluctuations in the input voltage or load, the step-down voltage VDD can be kept constant through the feedback regulation mechanism to ensure that the auxiliary module obtains a continuously adapted operating voltage.

[0062] The second filter unit 303 is connected to the output of the voltage conversion unit 302, and similarly performs secondary purification on the stepped-down voltage VDD (e.g., 5V) output by the voltage conversion unit 302. On the one hand, it filters out the high-frequency ripple generated by the switching action during the conversion process, and on the other hand, it absorbs the instantaneous voltage fluctuations when the load changes suddenly (e.g., the auxiliary module suddenly starts or stops working). Finally, it outputs a smooth and stable low-voltage DC power to each auxiliary module, ensuring the stable operation of these modules during normal equipment operation and avoiding functional abnormalities caused by voltage interference.

[0063] In one embodiment of this application, such as Figure 5 As shown, the first filtering unit 301 includes PC14 and PC15, which effectively filter out high-frequency interference signals mixed in the power supply voltage VIN through charging and discharging, making the voltage input to the subsequent voltage conversion unit 302 smoother and more stable.

[0064] In one embodiment of this application, such as Figure 5 As shown, the second filter unit 303 includes PC19, PC59, PC16 and PC17, which achieve the function of filtering out high-frequency components in the step-down voltage VDD through charging and discharging, making the step-down voltage VDD smoother and more stable.

[0065] For example, designers can select the capacity values ​​for PC14, PC15, PC19, PC59, PC16, and PC17. For instance, they can select that the capacity values ​​for PC14, PC19, and PC59 are all 10uF, the capacity values ​​for PC15 and PC16 are all 0.1uF, and the capacity value for PC17 is 100pF.

[0066] In one embodiment of this application, such as Figure 5 As shown, the voltage conversion unit 302 includes a voltage conversion chip PU2, a first resistor PR8, a second resistor PR13, a third resistor PR9, and a fourth resistor PR11. The first pin of the voltage conversion chip PU2 is electrically connected to the first end of the first resistor PR8, the first filter unit 301, and the power supply module 20, respectively. The second pin of the voltage conversion chip PU2 is electrically connected to the second end of the first resistor PR8 and the first end of the second resistor PR13, respectively. The second end of the second resistor PR13 is grounded. The third pin of the voltage conversion chip PU2 is electrically connected to the second filter unit 303. The fourth pin of the voltage conversion chip PU2 is electrically connected to the first end of the third resistor PR9 and the first end of the fourth resistor PR11, respectively. The second end of the third resistor PR9 is electrically connected to the second filter unit 303, and the second end of the fourth resistor PR11 is grounded.

[0067] Specifically, the VIN pin of voltage conversion chip PU2 serves as the first pin, used to receive the supply voltage VIN, providing energy input for PU2 to start operating. The EN pin of PU2 serves as the second pin, used to receive the first divided voltage obtained by dividing the supply voltage VIN through the first resistor PR8 and the second resistor PR13. This first divided voltage controls the chip's enable state; that is, when the first divided voltage reaches the PU2's enable threshold, PU2 activates its voltage conversion function, achieving a sensitive response to the power outage state of the power supply module 20. The SW pin of PU2 serves as the third pin, used to output the step-down voltage VDD. The FB pin of the voltage conversion chip PU2 serves as the fourth pin. It receives the second voltage divided by the third resistor PR9 and the fourth resistor PR11 to form a closed-loop feedback mechanism. It monitors the step-down voltage VDD in real time and compares it with the reference voltage inside the voltage conversion chip PU2. If there is a deviation, it automatically adjusts the conversion parameters to accurately control the magnitude of the step-down voltage VDD. This ensures that the step-down module 30 outputs a constant step-down voltage VDD (e.g., 5V), providing a stable and reliable power supply for the auxiliary function modules of the communication system.

[0068] In one embodiment of this application, such as Figure 5 As shown, a 0.1uF PC13 is provided between the fifth pin (BST pin) and the third pin (SW pin) of the voltage conversion chip PU2. This is a bootstrap capacitor, whose function is to provide sufficient drive voltage to the gate of the high-voltage side switching transistor inside the voltage conversion chip PU2, ensuring that the switching transistor can be turned on quickly and fully when it is turned on, reducing switching losses, improving voltage conversion efficiency, and especially in high-frequency switching operation, it can effectively maintain the normal drive of the switching transistor and ensure the stable operation of the conversion circuit.

[0069] The 4.7uH inductor PL2, connected to the third pin, acts as an energy storage inductor, performing energy transfer and storage during voltage conversion. When the internal switch of the voltage conversion chip PU2 is turned on, PL2 generates a magnetic field through which current flows to store energy. When the switch is turned off, PL2 releases the stored energy, working in conjunction with the subsequent capacitor to form a stable step-down voltage VDD.

[0070] PC22, with a capacitance of 12pF, is a high-frequency damping capacitor connected between the second terminal of PL2 and the first terminal of the fourth resistor PR11. It is primarily used to suppress high-frequency oscillations and parasitic oscillations in the circuit. Since PL2, along with the distributed capacitance in the circuit and internal parasitic parameters of the chip, may form a resonant circuit, causing high-frequency spikes or oscillations in the step-down voltage VDD, PC22 can absorb this high-frequency energy, disrupting the resonant condition, reducing voltage fluctuations, ensuring the smooth and stable operation of the step-down voltage VDD, and preventing high-frequency interference from affecting the normal operation of the downstream auxiliary modules.

[0071] This application also discloses an electronic product including the aforementioned communication system. This electronic product, through an optimized design of a circuit extending the power outage alarm time within the communication system, can more reliably report alarm signals during sudden power outages, thereby improving its operational stability and fault response capabilities. In practical applications, when an electronic product experiences a power outage, its internal communication system can extend the alarm time through directional power supply from the energy storage unit, ensuring that power outage information is promptly transmitted to the management platform. This facilitates rapid fault location by maintenance personnel, shortens troubleshooting time, and reduces communication interruption losses caused by sudden device offline. It is particularly suitable for home, enterprise, and industrial scenarios with high requirements for communication continuity, providing strong support for the efficient maintenance and reliable operation of electronic products.

[0072] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A circuit for extending the power failure alarm time, characterized in that, It includes a unidirectional conduction unit and an energy storage unit. The unidirectional conduction unit is electrically connected to the energy storage unit. The unidirectional conduction unit is used to be electrically connected to the power supply module and the step-down module respectively. The energy storage unit is used to be electrically connected to the signal processing module. When the power supply module is de-energized, the unidirectional conduction unit is used to prevent the energy storage unit from releasing energy to the step-down module; the energy storage unit is used to release energy to the signal processing module.

2. The circuit for extending the power failure alarm time according to claim 1, characterized in that, The unidirectional conduction unit includes a first diode, the anode of which is electrically connected to the power supply module and the step-down module respectively, and the cathode of which is electrically connected to the energy storage unit.

3. The circuit for extending the power failure alarm time according to claim 1, characterized in that, The energy storage unit includes a first capacitor, the first end of which is electrically connected to the unidirectional conduction unit and the signal processing module, and the second end of which is grounded.

4. The circuit for extending the power failure alarm time according to claim 3, characterized in that, The first capacitor is an electrolytic capacitor.

5. The circuit for extending the power failure alarm time according to any one of claims 1-4, characterized in that, The circuit for extending the power outage alarm time also includes a first filter capacitor, the first end of which is electrically connected to the energy storage unit and the signal processing module, and the second end of which is grounded.

6. The circuit for extending the power failure alarm time according to any one of claims 1-4, characterized in that, The extended power failure alarm time circuit also includes a second filter capacitor. The first end of the second filter capacitor is electrically connected to the unidirectional conduction unit and the power supply module, respectively, and the second end of the second filter capacitor is grounded.

7. A communication system, characterized in that, The device includes a power supply module, a step-down module, a signal processing module, and an extended power failure alarm time circuit as described in any one of claims 1-6. The power supply module is electrically connected to the unidirectional conduction unit in the step-down module and the extended power failure alarm time circuit, respectively, and the signal processing module is electrically connected to the energy storage unit in the extended power failure alarm time circuit. The power supply module is used to output power supply voltage to the step-down module and the unidirectional conduction unit; the step-down module is used to output a step-down voltage according to the power supply voltage; the signal processing module is used to receive the energy output by the energy storage unit when the power supply module is powered off, and output a power failure alarm signal.

8. The communication system according to claim 7, characterized in that, The step-down module includes a first filter unit, a voltage conversion unit, and a second filter unit. The voltage conversion unit is electrically connected to the first filter unit and the second filter unit, respectively. Both the first filter unit and the voltage conversion unit are electrically connected to the power supply module. The first filtering unit is used to filter out high-frequency components in the supply voltage; the voltage conversion unit is used to output the step-down voltage according to the supply voltage; and the second filtering unit is used to filter out high-frequency components in the step-down voltage.

9. The communication system according to claim 8, characterized in that, The voltage conversion unit includes a voltage conversion chip, a first resistor, a second resistor, a third resistor, and a fourth resistor. The first pin of the voltage conversion chip is electrically connected to the first end of the first resistor, the first filter unit, and the power supply module, respectively. The second pin of the voltage conversion chip is electrically connected to the second end of the first resistor and the first end of the second resistor, respectively. The second end of the second resistor is grounded. The third pin of the voltage conversion chip is electrically connected to the second filter unit. The fourth pin of the voltage conversion chip is electrically connected to the first end of the third resistor and the first end of the fourth resistor, respectively. The second end of the third resistor is electrically connected to the second filter unit, and the second end of the fourth resistor is grounded.

10. An electronic product, characterized in that, Includes the communication system described in any one of claims 7-9.

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