Optical modem device supporting multiple power supply modes

Abstract

The utility model relates to the technical field of network communication hardware, in particular to optical modem equipment supporting multiple power supply modes, which comprises an adapter power supply circuit, a network cable power supply circuit, an optical fiber composite optical cable power supply circuit, a voltage conversion circuit and a power supply switching circuit. The adapter power supply circuit is used for converting commercial power through a power adapter to obtain working electric energy meeting the use requirements of the optical modem equipment; the network cable power supply circuit obtains external electric energy input through a network cable and obtains working electric energy meeting the use requirements of the optical modem equipment after electric energy conversion; the optical fiber composite optical cable power supply circuit obtains external electric energy input through an optical fiber composite optical cable and obtains working electric energy meeting the use requirements of optical modem equipment after electric energy conversion; the voltage conversion circuit is used for performing electric energy conversion on the high voltage output by the network cable power supply circuit and the optical fiber composite optical cable power supply circuit; and the power supply switching circuit is used for switching to other power supply modes when the adapter power supply circuit is lost.

Description

Technical Field

[0001] The utility model relates to the technical field of network communication hardware, and in particular to an optical modem device that supports multiple power supply modes. Background Art

[0002] In the field of existing optical modem equipment, a significant technical limitation is the singleness of its power supply method. This singleness mainly stems from the fixed choice of power supply mode when designing the equipment, which fails to fully consider the diversity and complexity of the power supply environment in actual applications. Specifically, the power supply method of optical modem equipment is usually limited to a certain fixed mode, such as being powered by an adapter alone (usually an AC220V to 12V adapter, suitable for environments with stable power supply such as homes or offices), powered by network cable POE (Power Over Ethernet) (suitable for scenarios where data and power need to be transmitted simultaneously through network cables, such as powering IP cameras, wireless access points and other devices), or powered by optical fiber composite cable POF (Power over Fiber, optoelectronic composite cable) (suitable for special environments where optical fiber needs to be used to transmit signals and supply power at the same time).

[0003] While powering the device solely with an adapter is stable and reliable, it is limited by the location and number of power outlets, and the optical modem will immediately stop working if the power is interrupted. Network cable POE power supply offers flexibility and convenience, as it allows for simultaneous transmission of data and power over the same network cable. However, this method has certain requirements for the quality and length of the network cable, and not all optical modems support the POE power supply standard. Optical fiber composite cable (POF) power supply is an emerging technology that uses optical fiber to transmit signals while providing power through the conductors in the optical fiber composite structure. It is suitable for scenarios that require long-distance, high-speed data transmission while also taking into account power supply needs. However, this technology has not yet been widely used and is relatively expensive.

[0004] However, existing conventional optical modems often only support one of the aforementioned power supply methods. This single-power design significantly limits their applicability and flexibility. In complex power supply environments, such as those with insufficient power outlets, network cabling restrictions, or specialized power requirements, single-power optical modems often fail to meet user needs, limiting their market competitiveness and potential. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the present application provides an optical modem device that supports multiple power supply methods. By integrating multiple power supply methods and realizing intelligent switching, it can adapt to the power supply requirements in different environments and scenarios.

[0006] The technical means adopted by the utility model to solve the technical problem is: an optical modem device that supports multiple power supply modes, the improvement of which is that it includes an adapter power supply circuit, a network cable power supply circuit, an optical fiber composite cable power supply circuit, a voltage conversion circuit and a power supply switching circuit, wherein:

[0007] The adapter power supply circuit converts the mains electricity through the power adapter to obtain working power that meets the use requirements of the optical modem device;

[0008] The network cable power supply circuit obtains external power input through the network cable, and after power conversion, obtains working power that meets the use requirements of the optical modem device;

[0009] The optical fiber composite cable power supply circuit obtains external power input through the optical fiber composite cable, and after power conversion, obtains working power that meets the use requirements of the optical modem equipment;

[0010] The voltage conversion circuit is used to convert the high voltage output by the network cable power supply circuit and the optical fiber composite cable power supply circuit into electrical energy to obtain working electrical energy that meets the use requirements of the optical modem equipment;

[0011] The power supply switching circuit is used to switch to other power supply modes when the adapter power supply circuit is lost.

[0012] The network cable power supply circuit in the above technical solution includes a transformer, a rectifier bridge, a PD protocol chip, a voltage regulator diode PD12, a bidirectional breakdown diode PD13, a bidirectional breakdown diode PD14, a capacitor PC15 and a resistor PR35, wherein:

[0013] The electrical signal transmitted by the Ethernet cable is converted into a 48V power supply voltage through a transformer and a rectifier bridge; the positive electrode of the 48V power supply is connected to the negative electrode of the diode PD12, one end of the bidirectional breakdown diode PD14, one end of the capacitor PC15, one end of the resistor PR35, and the first pin of the PD protocol chip;

[0014] The negative pole of the 48V power supply is connected to one end of the bidirectional breakdown diode PD13, the other end of the bidirectional breakdown diode PD14, the other end of the capacitor PC15 and the fourth pin of the PD protocol chip; the other end of the bidirectional breakdown diode PD13 is connected to the positive pole of the voltage regulator diode PD12; the other end of the resistor PR35 is connected to the second pin of the PD protocol chip.

[0015] The optical fiber composite cable power supply circuit in the above technical solution includes a PD protocol chip, a voltage stabilizing diode PD3, a bidirectional breakdown diode PD15, a bidirectional breakdown diode PD16, a voltage stabilizing diode PD5, a resistor PR27, a resistor PR29, and a resistor PR30, wherein:

[0016] The positive electrode of the 48V power supply input by the optical fiber composite cable seat is connected to the positive electrode of the voltage-stabilizing diode PD3, one end of the bidirectional breakdown diode PD15, and one end of the resistor PR27; the other end of the resistor PR27 is connected to the resistor PR29 and one end of the resistor PR30, and the other end of the resistor PR30 is connected to the eighth pin of the PD protocol chip;

[0017] The negative electrode of the 48V power supply input by the optical fiber composite cable seat is connected to the other end of the bidirectional breakdown diode PD15, the other end of the bidirectional breakdown diode PD16 and the positive electrode of the voltage stabilizing diode PD5; the negative electrode of the voltage stabilizing diode PD5 is connected to the other end of the resistor PR29.

[0018] The voltage conversion circuit in the above technical solution includes a chip TM I 36031, a resistor PR117, a capacitor PC23, a voltage stabilizing diode PD11, an inductor PL1, a resistor PR28, a capacitor PC24, a resistor PR26, a resistor PR24, a resistor PR25, a capacitor PC29 and several protection capacitors, wherein:

[0019] The 48V power supply output by the network cable power supply circuit and the optical fiber composite cable power supply circuit is connected to the second pin of the chip TM I 36031. The resistor PR117 and the capacitor PC23 are connected in series between the eighth pin and the first pin of the chip TM I 36031. The eighth pin of the chip TM I 36031 is also grounded via a voltage regulator diode PD11 and connected to the sixth pin of the chip TM I 36031 via an inductor PL1 and a resistor PR28. The sixth pin of the chip TM I 36031 is also grounded via a capacitor PC24.

[0020] The eighth pin of the chip TM I 36031 is connected to one end of the inductor PL1, the other end of the inductor PL1 is connected to one end of the resistor PR26, the other end of the resistor PR26 is grounded through the resistors PR24 and PR25, and is connected to the fifth pin of the chip TM I 36031 through the capacitor PC29.

[0021] The power supply switching circuit in the above technical solution includes a chip EN7529CT, a resistor R129, a resistor R142, and a capacitor C108, wherein:

[0022] Pin AA6 of the chip EN7529CT is connected to one end of the resistor R129, the resistor R142, and the capacitor C108 respectively, and the other ends of the resistor R142 and the capacitor C108 are connected to a low level.

[0023] The above technical solution also includes a comparison circuit, which includes a chip EN7529 and a comparator, wherein:

[0024] The power converted by the network cable power supply circuit and the optical fiber composite cable power supply circuit is respectively connected to the input of the comparator, and the output of the comparator is connected to the GPIO pin of the chip EN7529 to check the high and low states of the two power supplies;

[0025] The chip EN7529 adjusts the output PWM waveform through the AVSMON pin and fine-tunes the 12V voltage value output by the chip TM I 36031 to make the power converted by the network cable power supply circuit and the optical fiber composite cable power supply circuit as consistent as possible.

[0026] The beneficial effects of the present invention are: not only improving the performance and flexibility of the equipment, but also reducing the production cost and development cycle, providing strong support for the technological innovation and industrial upgrading of optical modem equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram showing an embodiment of the present invention that supports multiple power supply modes;

[0028] Figure 2 This is a schematic diagram of a circuit supporting multiple power supply modes according to an embodiment of the present utility model;

[0029] Figure 3 This is a circuit diagram of a rectifier bridge according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of a power supply switching circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technical personnel in this field without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the present invention can be combined interactively without conflicting with each other.

[0033] Based on the technical issues mentioned in the above background technology, this utility model proposes a new optical modem device that aims to overcome the shortcomings of existing technologies by integrating multiple power supply methods and implementing intelligent switching to adapt to the power supply needs of different environments and scenarios. The implementation of this utility model will significantly improve the performance and flexibility of optical modem devices, meet a wider range of market needs, and provide strong support for technological innovation and industrial upgrading of optical modem devices.

[0034] like Figure 1 As shown, this embodiment provides an optical modem device that supports multiple power supply modes, including an adapter power supply circuit Apapter DC12V, a network cable power supply circuit PD DC48V, an optical fiber composite cable power supply circuit POF DC 48V, a voltage conversion circuit, and a power supply switching circuit, wherein:

[0035] The adapter power supply circuit converts the mains electricity through the power adapter to obtain working power that meets the use requirements of the optical modem device;

[0036] The network cable power supply circuit obtains external power input through the network cable, and after power conversion, obtains working power that meets the use requirements of the optical modem device;

[0037] The optical fiber composite cable power supply circuit obtains external power input through the optical fiber composite cable, and after power conversion, obtains working power that meets the use requirements of the optical modem equipment;

[0038] The voltage conversion circuit is used to convert the high voltage output by the network cable power supply circuit and the optical fiber composite cable power supply circuit into electrical energy to obtain working electrical energy that meets the use requirements of the optical modem equipment;

[0039] The power supply switching circuit is used to switch to other power supply modes when the adapter power supply circuit is lost.

[0040] In an exemplary embodiment, Figure 2 As shown, the network cable power supply circuit includes a transformer, a rectifier bridge, a PD protocol chip, a voltage regulator diode PD12, a bidirectional breakdown diode PD13, a bidirectional breakdown diode PD14, a capacitor PC15 and a resistor PR35, wherein,

[0041] Alternatively, as Figure 3 The figure shows a schematic diagram of a rectifier bridge according to an embodiment of the present application. The network cable power supply circuit includes an electrical signal transmitted by an Ethernet-supported network cable, which is connected to a 48V power supply voltage through a transformer and a rectifier bridge. The positive electrode of the 48V power supply is connected to the negative electrode of the diode PD12, one end of the bidirectional breakdown diode PD14, one end of the capacitor PC15, one end of the resistor PR35, and the first pin of the PD protocol chip.

[0042] The negative pole of the 48V power supply is connected to one end of the bidirectional breakdown diode PD13, the other end of the bidirectional breakdown diode PD14, the other end of the capacitor PC15 and the fourth pin of the PD protocol chip; the other end of the bidirectional breakdown diode PD13 is connected to the positive pole of the voltage regulator diode PD12; the other end of the resistor PR35 is connected to the second pin of the PD protocol chip.

[0043] Through the above circuit, the electrical signal transmitted by the network cable that supports network power supply is converted into a 48V power supply voltage through a transformer and a rectifier bridge. The power supply voltage is connected to VDD and VSS in the figure respectively. The PD protocol chip TM I 7303C supports the relevant requirements of the protocol 802.3af / at and outputs 48V for further processing by the back-end DCDC, thus realizing the PD function that supports PoE.

[0044] In an exemplary embodiment, continue to refer to Figure 2 As shown, the optical fiber composite cable power supply circuit includes a PD protocol chip, a voltage stabilizing diode PD3, a bidirectional breakdown diode PD15, a bidirectional breakdown diode PD16, a voltage stabilizing diode PD5, a resistor PR27, a resistor PR29, and a resistor PR30, wherein:

[0045] The positive electrode of the 48V power supply input by the optical fiber composite cable seat is connected to the positive electrode of the voltage-stabilizing diode PD3, one end of the bidirectional breakdown diode PD15, and one end of the resistor PR27; the other end of the resistor PR27 is connected to the resistor PR29 and one end of the resistor PR30, and the other end of the resistor PR30 is connected to the eighth pin of the PD protocol chip;

[0046] The negative electrode of the 48V power supply input by the optical fiber composite cable seat is connected to the other end of the bidirectional breakdown diode PD15, the other end of the bidirectional breakdown diode PD16 and the positive electrode of the voltage stabilizing diode PD5; the negative electrode of the voltage stabilizing diode PD5 is connected to the other end of the resistor PR29.

[0047] In an exemplary embodiment, continue to refer to Figure 2 As shown, the voltage conversion circuit includes a chip TM I36031, a resistor PR117, a capacitor PC23, a voltage stabilizing diode PD11, an inductor PL1, a resistor PR28, a capacitor PC24, a resistor PR26, a resistor PR24, a resistor PR25, a capacitor PC29 and several protection capacitors, wherein,

[0048] The 48V power supply output by the network cable power supply circuit and the optical fiber composite cable power supply circuit is connected to the second pin of the chip TM I 36031. The resistor PR117 and the capacitor PC23 are connected in series between the eighth pin and the first pin of the chip TM I 36031. The eighth pin of the chip TM I 36031 is also grounded via a voltage regulator diode PD11 and connected to the sixth pin of the chip TM I 36031 via an inductor PL1 and a resistor PR28. The sixth pin of the chip TM I 36031 is also grounded via a capacitor PC24.

[0049] The eighth pin of the chip TM I 36031 is connected to one end of the inductor PL1, the other end of the inductor PL1 is connected to one end of the resistor PR26, the other end of the resistor PR26 is grounded through the resistors PR24 and PR25, and is connected to the fifth pin of the chip TM I 36031 through the capacitor PC29.

[0050] It is worth mentioning that the seventh pin of the chip TM I 7303C outputs a low level to indicate that the "network cable power supply circuit" that supports PD is enabled, and outputs a high level to indicate that the "optical fiber composite cable power supply circuit" is enabled. The T2P signal output by the seventh pin of the chip TM I7303C is sent to the GPIO1 pin of the CPU EN7529, which detects whether the current mode is "network cable power supply circuit" or "optical fiber composite cable power supply", thereby realizing the "online status detection function of the power supply mode.

[0051] Similarly, the 12V power output by the adapter power supply circuit is recorded as DC12V / 2A-C. After being processed by the voltage divider network, it is obtained as 12V_Adapter_Check and given to the GPIO pin of the chip CPU EN7529. If the output is high, it is considered that the "adapter power supply" is online, otherwise it is considered offline.

[0052] In one possible implementation, Figure 4 As shown, the power supply switching circuit includes a chip EN7529CT, a resistor R129, a resistor R142, and a capacitor C108, wherein:

[0053] Pin AA6 of the chip EN7529CT is connected to one end of the resistor R129, the resistor R142, and the capacitor C108 respectively, and the other ends of the resistor R142 and the capacitor C108 are connected to a low level.

[0054] That is, when the 12V power supply is lower than the preset value, the BGPOR_DG INP signal is obtained through auxiliary components such as resistors R129 and R142. The CPU EN7529CT will output a specific optical signal to the OLT based on this signal. At this time, the FW adds the action of enabling the 54V to 12V DC / DC power supply enable signal EN_LA1823. In this way, the system can switch to other power supply modes when the "adapter power supply" is about to be lost.

[0055] In a possible implementation, the optical modem device further includes a comparison circuit, which includes a chip EN7529 and a comparator, wherein:

[0056] The power converted by the network cable power supply circuit and the optical fiber composite cable power supply circuit is respectively connected to the input of the comparator, and the output of the comparator is connected to the GPIO pin of the chip EN7529 to check the high and low states of the two power supplies;

[0057] The chip EN7529 adjusts the output PWM waveform through the AVSMON pin and fine-tunes the 12V voltage value output by the chip TM I 36031 to make the power converted by the network cable power supply circuit and the optical fiber composite cable power supply circuit as consistent as possible.

[0058] As mentioned above, the optical modem device provided in this application has two power sources, namely, DC12V / 2A-A / B output by the network cable power supply circuit and the optical fiber composite cable power supply circuit, and DC12V / 2A-C output by the adapter power supply circuit. After voltage division, they are input into the input of the comparator. The output of the comparator is recorded as Compare_12V, and Compare_12V is output to the GPIO of the CPU EN7529 to check the high and low states of the two power supplies. The CPU will adjust the output PWM waveform through the AVSMON pin to fine-tune the 12V voltage value output by the TM I 36031 so that DC12V / 2A-A / B and DC12V / 2A-C are as consistent as possible. In this way, when multiple power supplies are supplied at the same time, the power module output is fine-tuned to make the power modules as close as possible to improve compatibility.

[0059] The optical modem device proposed in this utility model has shown significant beneficial effects in many aspects, which are specifically reflected in the following aspects:

[0060] ① Multiple power supply options on the same board: By integrating multiple power supply options on the same board, this design significantly enhances the flexibility and adaptability of optical modem power supply. This design allows the optical modem to flexibly select the most appropriate power supply option based on the needs of different environments and scenarios, ensuring stable operation and wide applicability of the device.

[0061] ②CPU Intelligent Power On / Off Control: This system uses the CPU to selectively control the power on / off of certain power sources, enabling refined management of power resources. This intelligent control method not only helps reduce energy consumption and extend device life, but also dynamically adjusts power status based on actual needs, improving overall system performance.

[0062] ③ Voltage fine-tuning improves compatibility: When using multiple power sources simultaneously, the utility model uses an onboard voltage comparator to fine-tune the 12V output voltage of each power module, ensuring that the voltages of each power module are as close as possible. This design effectively improves the optical modem's compatibility with different power sources and reduces the risk of failure due to voltage mismatch.

[0063] ④ Intelligent Power Mode Switching Improves Continuous Power Supply Capability: This utility model automatically switches to other power modes when the "adapter power" is about to be lost, ensuring the continuous power supply of the optical modem device. This intelligent switching mechanism not only improves the reliability and stability of the device, but also prevents service interruptions or data loss caused by power outages at critical moments.

[0064] ⑤ Reduced Equipment Variety and Development Cycle: By adopting a unified design framework, this utility model enables optical modems with various power supply methods to be implemented simply by replacing different PCBAs (Printed Circuit Board Assemblies). This design strategy not only reduces the complexity of equipment types but also effectively shortens development cycles, improving production efficiency and market responsiveness.

[0065] To sum up, the optical modem device proposed in this utility model has significant beneficial effects. It not only improves the performance and flexibility of the equipment, but also reduces the production cost and development cycle, providing strong support for the technological innovation and industrial upgrading of optical modem equipment.

[0066] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An optical modem device that supports multiple power supply modes, characterized in that: It includes an adapter power supply circuit, a network cable power supply circuit, an optical fiber composite cable power supply circuit, a voltage conversion circuit, and a power supply switching circuit, wherein: The adapter power supply circuit converts the mains electricity through the power adapter to obtain working power that meets the use requirements of the optical modem device; The network cable power supply circuit obtains external power input through the network cable, and after power conversion, obtains working power that meets the use requirements of the optical modem device; The optical fiber composite cable power supply circuit obtains external power input through the optical fiber composite cable, and after power conversion, obtains working power that meets the use requirements of the optical modem equipment; The voltage conversion circuit is used to convert the high voltage output by the network cable power supply circuit and the optical fiber composite cable power supply circuit into electrical energy to obtain working electrical energy that meets the use requirements of the optical modem equipment; The power supply switching circuit is used to switch to other power supply modes when the adapter power supply circuit is lost.

2. The optical modem device supporting multiple power supply modes according to claim 1, characterized in that: The network cable power supply circuit includes a transformer, a rectifier bridge, a PD protocol chip, a voltage regulator diode PD12, a bidirectional breakdown diode PD13, a bidirectional breakdown diode PD14, a capacitor PC15 and a resistor PR35, wherein: The electrical signal transmitted by the Ethernet cable is converted into a 48V power supply voltage through a transformer and a rectifier bridge; the positive electrode of the 48V power supply is connected to the negative electrode of the diode PD12, one end of the bidirectional breakdown diode PD14, one end of the capacitor PC15, one end of the resistor PR35, and the first pin of the PD protocol chip; The negative pole of the 48V power supply is connected to one end of the bidirectional breakdown diode PD13, the other end of the bidirectional breakdown diode PD14, the other end of the capacitor PC15 and the fourth pin of the PD protocol chip; the other end of the bidirectional breakdown diode PD13 is connected to the positive pole of the voltage regulator diode PD12; the other end of the resistor PR35 is connected to the second pin of the PD protocol chip.

3. The optical modem device supporting multiple power supply modes according to claim 1, characterized in that: The optical fiber composite cable power supply circuit includes a PD protocol chip, a voltage stabilizing diode PD3, a bidirectional breakdown diode PD15, a bidirectional breakdown diode PD16, a voltage stabilizing diode PD5, a resistor PR27, a resistor PR29, and a resistor PR30, wherein: The positive electrode of the 48V power supply input by the optical fiber composite cable seat is connected to the positive electrode of the voltage-stabilizing diode PD3, one end of the bidirectional breakdown diode PD15, and one end of the resistor PR27; the other end of the resistor PR27 is connected to the resistor PR29 and one end of the resistor PR30, and the other end of the resistor PR30 is connected to the eighth pin of the PD protocol chip; The negative electrode of the 48V power supply input by the optical fiber composite cable seat is connected to the other end of the bidirectional breakdown diode PD15, the other end of the bidirectional breakdown diode PD16 and the positive electrode of the voltage stabilizing diode PD5; the negative electrode of the voltage stabilizing diode PD5 is connected to the other end of the resistor PR29.

4. The optical modem device supporting multiple power supply modes according to claim 1, characterized in that: The voltage conversion circuit includes a chip TMI 36031, a resistor PR117, a capacitor PC23, a voltage stabilizing diode PD11, an inductor PL1, a resistor PR28, a capacitor PC24, a resistor PR26, a resistor PR24, a resistor PR25, a capacitor PC29 and several protection capacitors, wherein: The 48V power supply output by the network cable power supply circuit and the optical fiber composite cable power supply circuit is connected to the second pin of the chip TMI 36031. The resistor PR117 and the capacitor PC23 are connected in series between the eighth pin and the first pin of the chip TMI 36031. The eighth pin of the chip TMI 36031 is also grounded via a voltage regulator diode PD11 and connected to the sixth pin of the chip TMI 36031 via an inductor PL1 and a resistor PR28. The sixth pin of the chip TMI 36031 is also grounded via a capacitor PC24. The eighth pin of the chip TMI 36031 is connected to one end of the inductor PL1, the other end of the inductor PL1 is connected to one end of the resistor PR26, the other end of the resistor PR26 is grounded through the resistors PR24 and PR25, and is connected to the fifth pin of the chip TMI36031 through the capacitor PC29.

5. The optical modem device supporting multiple power supply modes according to claim 1, characterized in that: The power supply switching circuit includes a chip EN7529CT, a resistor R129, a resistor R142, and a capacitor C108, wherein: Pin AA6 of the chip EN7529CT is connected to one end of the resistor R129, the resistor R142, and the capacitor C108 respectively, and the other ends of the resistor R142 and the capacitor C108 are connected to a low level.

6. The optical modem device supporting multiple power supply modes according to claim 4, characterized in that: It also includes a comparison circuit, which includes a chip EN7529 and a comparator, wherein: The power converted by the network cable power supply circuit and the optical fiber composite cable power supply circuit is respectively connected to the input of the comparator, and the output of the comparator is connected to the GPIO pin of the chip EN7529 to check the high and low states of the two power supplies; The chip EN7529 adjusts the output PWM waveform through the AVSMON pin and fine-tunes the 12V voltage value output by the chip TMI 36031 to make the power converted by the network cable power supply circuit and the optical fiber composite cable power supply circuit as consistent as possible.

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