Circuit structure for poe_pd and adapter dual power supply and electronic equipment

Abstract

The utility model discloses a kind of circuit structure and electronic equipment for POE_PD and adapter double power supply, it is related to electronic circuit technical field, it includes POE PD circuit, external adapter power supply branch and power supply output module.POE PD circuit is handled by first rectifier bridge and second rectifier bridge access POE signal and through POE power receiving module and DC conversion module;External adapter power supply branch is realized positive and negative pole non-tapping function by third rectifier bridge and voltage is input to POE PD circuit.Can optimize the compatibility of two power supply modes, simplify circuit structure, reduce design cost, while ensuring POE power supply and adapter power supply independent work and do not interfere with each other, applicable to POE equipment needing flexible power supply, ensure overall function practicability.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and more specifically, to a circuit structure and electronic device for dual power supply of POE_PD and adapter. Background Technology

[0002] Currently, in the field of electronic devices, Power over Ethernet (PoE) technology is widely used in devices such as network cameras and wireless access points (APs) because it can transmit data and power simultaneously through network cables. This not only simplifies the wiring requirements of the devices but also improves the flexibility of installation.

[0003] However, in practical applications, PoE devices often require backup power from external adapters to ensure continuous operation when PoE power is unavailable or interrupted. Existing external adapter power supply solutions typically only support a 12V input voltage, while the standard PoE operating voltage is usually 48V, resulting in poor overall compatibility between external adapters and the PoE standard power supply.

[0004] Furthermore, existing technologies for connecting external adapters to PoE power receiving circuits fail to fully utilize the DC-DC converter module within the PoE circuit. This often necessitates the design of separate adapter circuits, limiting the adapter's input voltage range and reducing circuit resource utilization, making it difficult to meet the flexible power supply requirements of modern electronic devices. Therefore, achieving compatibility between external adapters and PoE power supply while simplifying the circuit structure without affecting the normal operation of the PoE circuit has become an urgent technical challenge. Utility Model Content

[0005] Therefore, this utility model provides a circuit structure and electronic device for dual power supply of POE_PD and adapter, in order to solve the technical problems of poor overall compatibility between external adapter power supply and POE power supply, high circuit complexity and low resource utilization in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A circuit structure for dual power supply of PoE_PD and adapter includes:

[0008] The POE PD circuit includes a POE power receiving module PD, a DC-DC converter module PD DC-DC, and a power output module PWR_OUT, which are connected in sequence.

[0009] The input terminals of the POE power receiving module PD are electrically connected to D+ nodes and D- nodes respectively, and the input terminals of the POE power receiving module PD are electrically connected to a rectifier bridge assembly through D+ nodes and D- nodes.

[0010] An external adapter power supply branch includes a branch rectifier bridge, the positive output terminal of which is connected to the D+ node, and the negative output terminal of which is connected to the circuit ground GND.

[0011] Based on the above technical solution, the present invention is further described as follows:

[0012] As a further embodiment of this utility model,

[0013] The output terminal of the POE power receiving module PD is connected to the input terminal of the DC-DC converter module PD, and the output terminal of the DC-DC converter module PD is connected to the power output module PWR_OUT.

[0014] As a further embodiment of this utility model,

[0015] The rectifier bridge assembly includes a first rectifier bridge D1 and a second rectifier bridge D2;

[0016] The positive output terminals of the first rectifier bridge D1 and the second rectifier bridge D2 are connected to the D+ node, and the negative output terminals of the first rectifier bridge D1 and the second rectifier bridge D2 are connected to the D- node.

[0017] As a further embodiment of this utility model,

[0018] The input terminals of the first rectifier bridge D1 are connected to the POE1+ and POE1- signals respectively through test points TP1 and TP2, and the input terminals of the second rectifier bridge D2 are connected to the POE2+ and POE2- signals respectively through test points TP3 and TP4.

[0019] As a further embodiment of this utility model,

[0020] The branch rectifier bridge is configured as the third rectifier bridge D3;

[0021] The positive output terminal of the third rectifier bridge D3 is connected to the D+ node, and the negative output terminal of the third rectifier bridge D3 is connected to the circuit ground GND.

[0022] As a further embodiment of this utility model,

[0023] The AC input terminal of the third rectifier bridge D3 is connected to the DC1 and DC2 signals of the external adapter through test points TP5 and TP6, respectively.

[0024] As a further embodiment of this utility model,

[0025] Both the first rectifier bridge D1 and the second rectifier bridge D2 are configured as single-phase bridge rectifiers;

[0026] The third rectifier bridge D3 is configured as a single-phase bridge rectifier, and the third rectifier bridge D3 is configured as a full-wave rectifier bridge, used to ensure that the positive and negative terminals of DC1 and DC2 at the input terminals of the external adapter are not disconnected.

[0027] As a further embodiment of this utility model,

[0028] When powered by PoE, the third rectifier bridge D3 is in reverse cutoff state, and the PoE PD circuit works independently and outputs voltage through the power supply output terminal PWR_OUT.

[0029] As a further embodiment of this utility model,

[0030] When the external adapter supplies power, the third rectifier bridge D3 rectifies the input voltage and transmits it to the D+ node. After being processed by the POE power receiving module PD and the DC-DC conversion module PD, the voltage is output through the power supply output terminal PWR_OUT.

[0031] An electronic device includes the circuit structure described above for dual power supply of POE_PD and adapter.

[0032] This utility model has the following beneficial effects:

[0033] 1. The overall circuit structure is simplified and clear, reducing the use of additional circuit components, while lowering design costs and debugging difficulty, and improving the overall operability of the circuit.

[0034] 2. This circuit structure significantly improves power supply compatibility through the external adapter, enabling the external adapter to support the operating voltage range consistent with the PoE standard, thus avoiding limitations on the adapter's input voltage.

[0035] 3. This circuit structure enables independent operation of PoE power supply and external adapter power supply, ensuring that the two power supply modes do not interfere with each other, thus improving the system's functional reliability and practicality. Attached Figure Description

[0036] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The structures, proportions, sizes, etc., drawn in this specification are only used to complement the content disclosed in the specification, so that those skilled in the art can understand and read them. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0037] Figure 1This is an overall schematic diagram of the circuit structure for dual power supply of POE_PD and adapter provided in an embodiment of the present invention.

[0038] The attached diagram lists the components represented by each number as follows:

[0039] D1: First rectifier bridge; D2: Second rectifier bridge; D3: Third rectifier bridge;

[0040] PD: PoE power receiving module;

[0041] PD DC-DC: Direct current converter module;

[0042] TP1: Test point connected to the POE1+ signal;

[0043] TP2: Test point connected to POE1 signal;

[0044] TP3: Test point connected to the POE2+ signal;

[0045] TP4: Test point connected to the POE2 signal;

[0046] DC1, DC2: Input terminals of the external adapter;

[0047] TP5: Test point for connecting the external adapter DC1 signal;

[0048] TP6: Test point for connecting the external adapter's DC2 signal;

[0049] D+, D-: Positive and negative terminals in a PoE PD circuit;

[0050] GND: Circuit ground;

[0051] PWR_OUT: Power supply output terminal. Detailed Implementation

[0052] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0053] The terms "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0054] Combined with appendix Figure 1 The specific implementation of this embodiment will be described in detail below. (Appendix) Figure 1 The diagram shows the circuit structure for dual power supply via PoE_PD and adapter, with key components and their connections labeled. The selection, connection method, and operating principle of each component are described below with reference to the accompanying diagrams.

[0055] Please refer to Figure 1 The first rectifier bridge D1, the second rectifier bridge D2, and the third rectifier bridge D3 all use MB6S single-phase bridge rectifiers. This model features low power consumption and high voltage withstand capability, meeting the 48V input voltage requirement of the PoE standard. The PoE power receiving module PD can use, but is not limited to, the TPS23754 chip compliant with the IEEE 802.3af / at standard. This chip has detection, classification, and voltage regulation functions, ensuring input voltage stability and meeting system requirements. The DC-DC converter module PD uses the LM2596 wide-input-range DC-DC converter, supporting an input voltage range of 48V, with an output voltage that can be set to 12V or 5V according to system requirements. The input terminals DC1 and DC2 of the external adapter are designed to support 48V input voltage, consistent with the PoE standard operating voltage, thus achieving power supply compatibility.

[0056] Specifically, the input terminals of the first rectifier bridge D1 are connected to the POE1+ and POE1- signals respectively through test points TP1 and TP2, and the input terminals of the second rectifier bridge D2 are connected to the POE2+ and POE2- signals respectively through test points TP3 and TP4. The positive output terminals of the first rectifier bridge D1 and the second rectifier bridge D2 are connected to the D+ node, and the negative output terminals of the first rectifier bridge D1 and the second rectifier bridge D2 are connected to the D- node. The D+ and D- nodes, as the positive and negative nodes in the POE PD circuit, are connected to the input terminals of the POE receiving module PD, respectively, to receive the rectified POE voltage and perform preliminary processing.

[0057] The output of the PoE receiving module PD is connected to the input of the DC-DC converter module PD, and the output of the DC-DC converter module PD is connected to the power output module PWR_OUT, ultimately providing a stable operating voltage to the external system. The AC input of the third rectifier bridge D3 is connected to the DC1 and DC2 signals of the external adapter through test points TP5 and TP6, respectively. The positive output of the third rectifier bridge D3 is connected to the D+ node, and the negative output is connected to the circuit ground GND. This connection method allows the input voltage of the external adapter to be directly connected to the D+ node of the PoE PD circuit without the need for additional adapter circuit design.

[0058] Based on the circuit structure described above, the circuit operates as follows in PoE power supply mode:

[0059] When the Ethernet line provides PoE power, the PoE1+ and PoE1- signals are rectified by the first rectifier bridge D1 and output, while the PoE2+ and PoE2- signals are rectified by the second rectifier bridge D2 and output. The positive output terminals of the first rectifier bridge D1 and the second rectifier bridge D2 are connected to the D+ node, and the negative output terminals are connected to the D- node. The rectified voltage is input to the PoE powered module PD through the D+ and D- nodes. The PoE powered module PD detects and classifies the input voltage, confirms that it conforms to the PoE power supply standard, and then transmits the voltage to the DC-DC converter module PD. The DC-DC converter module PD converts the input voltage into the stable operating voltage required by the system, such as 12V or 5V, and supplies power to the external system through the power output module PWR_OUT. During this process, since the external adapter is not connected, there is no voltage input at the input terminal of the third rectifier bridge D3, so it is in a reverse cutoff state and will not interfere with the normal operation of the PoE PD circuit.

[0060] Based on the above circuit structure, the operating principle of the circuit in the external adapter power supply mode is as follows;

[0061] When the external adapter is connected to DC1 and DC2 signals, regardless of the adapter's positive and negative terminals, the third rectifier bridge D3 can convert the input voltage into a DC voltage with the positive terminal output to the D+ node and the negative terminal output to the circuit ground GND through full-wave rectification. Since the D+ and D- nodes are both connected to the input terminal of the PoE power receiving module PD, the rectified voltage is input to the PoE power receiving module PD through the D+ node. After the PoE power receiving module PD detects that the input voltage meets the requirements, it starts its internal circuit and transmits the voltage to the DC-DC converter module PD DC-DC. The DC-DC converter module PD DC-DC converts the input voltage into the operating voltage required by the system and supplies power to the external system through the power output module PWR_OUT.

[0062] During this process, the detection function of the POE power receiving module PD ensures the stability of the input voltage, while the DC-DC converter module PD achieves accurate voltage conversion.

[0063] During the actual debugging process, the design of test points TP1 to TP6 facilitates circuit debugging. TP1 and TP2 can monitor the input status of POE1+ and POE1- signals, TP3 and TP4 can monitor the input status of POE2+ and POE2- signals, and TP5 and TP6 can monitor the input status of external adapter DC1 and DC2 signals. These test points make signal detection in the circuit more intuitive, helping to quickly locate and repair faults. Furthermore, the overall circuit connection is simplified and clear, further reducing the difficulty of debugging.

[0064] In summary, the technical solution of this embodiment optimizes the connection method between the external adapter and the PoE PD circuit, avoiding the need to design a separate adapter circuit. It makes full use of the functions of the PoE power receiving module PD and the DC-DC converter module PD, significantly simplifying the overall circuit structure. At the same time, it achieves dual power supply compatibility between PoE power supply and external adapter power supply, solving the problems of limited input voltage, high circuit complexity and low resource utilization in the prior art. It is suitable for various PoE devices that require flexible power supply.

[0065] The design of the third rectifier bridge D3 enables the external adapter input to be connected without polarity separation, improving power supply flexibility. Simultaneously, the reverse cutoff characteristic of the third rectifier bridge D3 allows for independent operation of PoE power supply and external adapter power supply, ensuring that the two power supply modes do not interfere with each other.

[0066] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A circuit structure for dual power supply of PoE_PD and adapter, characterized in that, include: The POE PD circuit includes a POE power receiving module PD, a DC-DC converter module PD DC-DC, and a power output module PWR_OUT, which are connected in sequence. The input terminals of the POE power receiving module PD are electrically connected to the D+ node and the D- node, respectively, and the input terminals of the POE power receiving module PD are electrically connected to a rectifier bridge assembly through the D+ node and the D- node; the external adapter power supply branch includes a branch rectifier bridge, the positive output terminal of the branch rectifier bridge is connected to the D+ node, and the negative output terminal of the branch rectifier bridge is connected to the circuit ground GND.

2. The circuit structure for dual power supply of PoE_PD and adapter according to claim 1, characterized in that, The output terminal of the POE power receiving module PD is connected to the input terminal of the DC-DC converter module PD, and the output terminal of the DC-DC converter module PD is connected to the power output module PWR_OUT.

3. The circuit structure for dual power supply of PoE_PD and adapter according to claim 1, characterized in that, The rectifier bridge assembly includes a first rectifier bridge D1 and a second rectifier bridge D2; The positive output terminals of the first rectifier bridge D1 and the second rectifier bridge D2 are connected to the D+ node, and the negative output terminals of the first rectifier bridge D1 and the second rectifier bridge D2 are connected to the D- node.

4. The circuit structure for dual power supply of PoE_PD and adapter according to claim 3, characterized in that, The input terminals of the first rectifier bridge D1 are connected to the POE1+ and POE1- signals respectively through test points TP1 and TP2, and the input terminals of the second rectifier bridge D2 are connected to the POE2+ and POE2- signals respectively through test points TP3 and TP4.

5. The circuit structure for dual power supply of PoE_PD and adapter according to claim 3, characterized in that, The branch rectifier bridge is configured as the third rectifier bridge D3; The positive output terminal of the third rectifier bridge D3 is connected to the D+ node, and the negative output terminal of the third rectifier bridge D3 is connected to the circuit ground GND.

6. The circuit structure for dual power supply of PoE_PD and adapter according to claim 5, characterized in that, The AC input terminal of the third rectifier bridge D3 is connected to the DC1 and DC2 signals of the external adapter through test points TP5 and TP6, respectively.

7. The circuit structure for dual power supply of PoE_PD and adapter according to claim 5, characterized in that, Both the first rectifier bridge D1 and the second rectifier bridge D2 are configured as single-phase bridge rectifiers; The third rectifier bridge D3 is configured as a single-phase bridge rectifier, and the third rectifier bridge D3 is configured as a full-wave rectifier bridge, used to ensure that the positive and negative terminals of DC1 and DC2 at the input terminals of the external adapter are not disconnected.

8. The circuit structure for dual power supply of PoE_PD and adapter according to claim 5, characterized in that, When powered by PoE, the third rectifier bridge D3 is in reverse cutoff state, and the PoE PD circuit works independently and outputs voltage through the power supply output terminal PWR_OUT.

9. The circuit structure for dual power supply of PoE_PD and adapter according to claim 8, characterized in that, When the external adapter supplies power, the third rectifier bridge D3 rectifies the input voltage and transmits it to the D+ node. After being processed by the POE power receiving module PD and the DC-DC conversion module PD, the voltage is output through the power supply output terminal PWR_OUT.

10. An electronic device, characterized in that, Includes the circuit structure for dual power supply of POE_PD and adapter as described in any one of claims 1-9.

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