Power supply circuit based on PD protocol and router

Abstract

The invention discloses a power supply circuit based on a PD protocol, and relates to the technical field of power supply. The PD protocol chip is connected with the input interface and used for detecting the type of the adapter and controlling the adapter to output corresponding voltage based on the type of the adapter; the wide-voltage input power management IC is connected with the output end of the PD protocol chip and is used for outputting a constant 5V voltage; and the first load is connected with the wide-voltage input power management IC and receives the constant 5V voltage output by the wide-voltage input power management IC. According to the invention, the type of the adapter is dynamically identified through the PD protocol chip, the output voltage is controlled, single-stage high-efficiency conversion is realized in combination with the wide-voltage input power management IC, and a traditional multi-stage redundant circuit is eliminated. The energy utilization rate is improved, meanwhile, the layout space occupation is remarkably reduced, the voltage precision and stability are ensured through the 5V direct supply key load, and the power supply energy efficiency, the integration degree and the reliability are comprehensively optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a power supply circuit and a router based on the PD protocol. Background Art

[0002] The power supply systems of electronic devices (such as routers) commonly use USB PD-based adapters as input power sources. These adapters typically support multiple output voltages (e.g., 12V, 9V, and 5V). However, the functional modules within the device (such as the RF front-end module (FEM) and cooling fans) often require a stable 5V power supply. This requires the power supply circuit to efficiently convert a wide range of input voltages to a 5V output.

[0003] Existing technologies generally implement this function through a multi-stage buck-boost topology. That is, when the PD adapter outputs at 5V, the input voltage must first be stepped down to an intermediate value and then stepped up to the target 5V. While this architecture achieves voltage conversion, it introduces multiple issues due to inherent circuit redundancy. First, the multi-stage energy conversion process inevitably involves cumulative losses. Especially when the input and output voltages are close, the proportion of reactive power conversion increases significantly, resulting in a decrease in overall system efficiency. Second, the independent buck and boost circuits require multiple power management chips and supporting components. Within the limited circuit board area of ​​portable devices, large components not only occupy critical wiring channels but also easily introduce electromagnetic interference due to the proximity of high-frequency switching circuits and RF modules. Furthermore, the localized temperature rise of densely packed components further exacerbates performance degradation. Furthermore, due to conversion losses, the actual voltage supplied to the RF module is often lower than the nominal requirement, resulting in reduced signal gain and stability.

[0004] These issues collectively expose inherent flaws in traditional solutions in terms of energy efficiency optimization, space utilization, and power quality. The root cause lies in their lack of dynamic adaptability to input voltages, the mandatory use of a fixed multi-stage conversion mode, and their inability to intelligently match the optimal conversion path based on the actual input voltage. Therefore, developing an efficient circuit architecture that can adapt to input voltages and simplify the conversion process has become a key breakthrough in resolving power supply issues in portable devices. Summary of the Invention

[0005] The embodiments of the present invention provide a power supply circuit and a router based on the PD protocol, aiming to solve the problems of poor energy efficiency, large space occupation and poor power supply quality of existing router power supply circuits.

[0006] To solve the above problems, in a first aspect, an embodiment of the present invention provides a power supply circuit based on the PD protocol, including:

[0007] Input interface, used to connect the adapter;

[0008] A PD protocol chip, connected to the input interface, configured to detect the type of the adapter and control the adapter to output a corresponding voltage based on the adapter type;

[0009] A wide voltage input power management IC is connected to the output terminal of the PD protocol chip and is used to output a constant 5V voltage;

[0010] The first load is connected to the wide voltage input power management IC and receives a constant 5V voltage output by the wide voltage input power management IC.

[0011] A further technical solution is that controlling the voltage outputted by the adapter based on the type of the adapter includes:

[0012] If the adapter supports the PD protocol, control the adapter to output a 12V voltage;

[0013] If the adapter does not support the PD protocol, control the adapter to output a 5V voltage.

[0014] A further technical solution is that the input voltage range of the wide voltage input power management IC is 4V-23V.

[0015] A further technical solution is that the first load is a radio frequency front-end module.

[0016] A further technical solution is that the first load is a fan.

[0017] A further technical solution is that the model of the wide voltage input power management IC is TMI2605, and the model of the PD protocol chip is ETA7906D2K.

[0018] A further technical solution is that the power supply circuit based on the PD protocol also includes a solid-state capacitor, and the solid-state capacitor is connected to the input end of the wide-voltage input power management IC.

[0019] A further technical solution is that the power supply circuit based on the PD protocol also includes a voltage conversion circuit and a second load, and the wide voltage input power management IC is connected to the second load through the voltage conversion circuit.

[0020] A further technical solution is that the voltage conversion circuit is a DC-DC circuit.

[0021] In a second aspect, an embodiment of the present invention provides a router, comprising a power supply circuit based on the PD protocol as described in the first aspect.

[0022] Compared with the prior art, the embodiments of the present invention can achieve the following technical effects:

[0023] An embodiment of the present invention provides a power supply circuit based on the Power Delivery (PD) protocol, comprising: an input interface for connecting to an adapter; a PD protocol chip connected to the input interface and configured to detect the adapter type and control the adapter output voltage based on the adapter type; a wide-voltage input power management IC connected to the output of the PD protocol chip and configured to output a constant 5V voltage; and a first load connected to the wide-voltage input power management IC and configured to receive the constant 5V voltage output by the wide-voltage input power management IC. The power supply circuit proposed in the present invention fundamentally optimizes the energy transfer path by synergizing the PD protocol chip's dynamic identification of the adapter type with the wide-voltage input power management IC's single-stage conversion. The PD protocol chip controls the output matching voltage based on the adapter's protocol support capabilities (outputting 12V when the PD protocol is supported, and 5V otherwise), ensuring that the wide-voltage input power management IC always operates at the optimal input voltage. When the input is 12V, the power management IC outputs 5V in an efficient buck mode; when the input is 5V, it directly outputs the voltage, completely avoiding the redundant step of bucking and then boosting the 5V input in traditional solutions, thereby significantly reducing the inherent losses of multi-stage energy conversion. This adaptive mechanism not only improves overall system energy efficiency but also significantly reduces circuit size by eliminating the auxiliary components required for intermediate conversion circuits. This makes it particularly suitable for the demanding high-density integration requirements of portable devices. The first load directly receives the 5V voltage without secondary conversion, avoiding the voltage drop caused by conversion losses in traditional multi-stage architectures and eliminating ripple interference introduced by inter-stage coupling. Taking the RF front-end module as an example, the precise and stable 5V direct supply enables it to operate within the optimal voltage range, simultaneously improving signal gain and communication stability. If the load is a cooling fan, the 5V direct drive solution eliminates the dedicated drive circuit, simplifying the layout while reducing electromagnetic noise radiation. The wide-voltage input power management IC's compatibility with a 4V–23V input range further expands application scenarios. Whether it is the high-voltage input of a PD adapter or the low-voltage power supply of a battery system, a single chip can achieve stable output, essentially resolving the inherent contradiction of discrete power supply paths in multi-voltage domain systems. Ultimately, the design achieves synergistic gains in three dimensions: energy efficiency optimization, space utilization, and power supply quality. Energy efficiency is reflected in the minimization of ineffective energy conversion; space is manifested in the release of critical wiring channels; and power supply quality is reflected in the dual improvement of load-end voltage accuracy and anti-interference performance, providing portable electronic devices with a power supply solution that is both efficient and robust.

[0024] In summary, this invention uses a PD protocol chip to dynamically identify the adapter type and control the output voltage. Combined with a wide-voltage input power management IC, it achieves single-stage, high-efficiency conversion, eliminating the traditional multi-stage redundant circuitry. This significantly reduces layout space while improving energy efficiency. Furthermore, by directly supplying 5V to critical loads, it ensures voltage accuracy and stability, comprehensively optimizing power supply efficiency, integration, and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0028] Figure 1 This is a circuit block diagram of a power supply circuit based on the PD protocol proposed in an embodiment of the present invention.

[0029] Reference numerals

[0030] Input interface 10 , PD protocol chip 20 , wide voltage input power management IC 30 , first load 40 , solid capacitor 50 , voltage conversion circuit 60 , second load 70 , adapter 80 . DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Similar component numbers in the drawings represent similar components. Obviously, the embodiments described below are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0033] It should also be understood that the terms used in this description of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the description of the embodiments of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0034] See also Figure 1 The embodiment of the present invention provides a power supply circuit based on the PD protocol. The power supply circuit based on the PD protocol includes an input interface 10, a PD protocol chip 20, a wide voltage input power management IC 30, and a first load 40. The specific structure is described as follows:

[0035] The input interface 10 is used to connect the adapter 80. The adapter 80 is used to connect to the power supply. The PD protocol chip 20 is connected to the input interface 10, and is used to detect the type of the adapter 80, and control the adapter 80 to output the corresponding voltage based on the type of the adapter 80. The wide voltage input power management IC 30 is connected to the output end of the PD protocol chip 20, and is used to output a constant 5V voltage. The first load 40 is connected to the wide voltage input power management IC 30, and receives the constant 5V voltage output by the wide voltage input power management IC 30. The number of the first load 40 can be multiple, and the present invention does not specifically limit this. For example, the first load 40 includes a radio frequency front-end module, a fan, etc.

[0036] In the present invention, by providing a collaborative architecture between a PD protocol chip 20 and a wide-voltage input power management IC 30, the power supply circuit achieves dynamic identification of the adapter 80 type and intelligent optimization of the power supply path. After detecting the adapter 80 type, the PD protocol chip 20 controls its output to match the voltage (e.g., 12V or 5V), enabling the wide-voltage input power management IC 30 to directly output a constant 5V voltage to the first load 40 within a wide voltage range (4V-23V). This design eliminates the intermediate voltage conversion step in traditional solutions. For example, when the input voltage is 5V, the power management IC can directly supply 5V without performing redundant buck-boost operations, significantly reducing energy loss during multiple conversions. Furthermore, by eliminating the auxiliary circuit components required for traditional multi-stage conversion, PCB layout space is freed up, making it particularly suitable for the high-density integration requirements of portable devices. The first load 40 (e.g., an RF module or fan) directly receives a stable 5V voltage, avoiding the voltage drop caused by conversion losses in traditional solutions and ensuring that the load operates within the optimal voltage range. For example, a precise 5V power supply for the RF front-end module can improve signal gain stability.

[0037] An embodiment of the present invention provides a power supply circuit based on the PD protocol, comprising: an input interface 10 for connecting to an adapter 80; a PD protocol chip 20 connected to the input interface 10 and configured to detect the type of the adapter 80 and control the adapter 80 to output a corresponding voltage based on the type of the adapter 80; a wide-voltage input power management IC 30 connected to the output of the PD protocol chip 20 and configured to output a constant 5V voltage; and a first load 40 connected to the wide-voltage input power management IC 30 and configured to receive the constant 5V voltage output by the wide-voltage input power management IC 30. The power supply circuit proposed in the present invention fundamentally optimizes the energy transfer path through the synergistic effect of the PD protocol chip 20's dynamic identification of the adapter 80 type and the wide-voltage input power management IC 30's single-stage conversion. The PD protocol chip 20 controls the output matching voltage based on the adapter 80's protocol support capabilities (outputting 12V when supporting the PD protocol and 5V otherwise), ensuring that the wide-voltage input power management IC 30 always operates at the optimal input voltage. When the input is 12V, the power management IC outputs 5V in a highly efficient buck mode; when the input is 5V, it outputs directly, completely avoiding the redundant conversion steps in traditional solutions where the 5V input must first be bucked and then boosted, thereby significantly reducing the inherent losses of multi-stage energy conversion. This adaptive mechanism not only improves the overall energy efficiency of the system, but also significantly reduces the circuit size by eliminating the auxiliary components required for the intermediate conversion circuit, making it particularly suitable for the stringent requirements of high-density integration in portable devices. The first load 40 directly receives the 5V voltage without secondary conversion, avoiding the voltage drop caused by conversion losses in traditional multi-stage architectures and eliminating ripple interference introduced by inter-stage coupling. Taking the RF front-end module as an example, the precise and stable 5V direct supply enables it to operate in the optimal voltage range, thereby simultaneously improving signal gain strength and communication stability. If the load is a cooling fan, the 5V direct drive solution eliminates the dedicated drive circuit, simplifying the layout while reducing electromagnetic noise radiation. The wide-voltage input power management IC30's compatibility with a 4V–23V input range further expands its application scenarios. Whether it's the high-voltage input of a PD adapter 80 or the low-voltage power supply of a battery system, a single chip can achieve stable output, essentially resolving the inherent contradiction of discrete power paths in multi-voltage domain systems. Ultimately, this design achieves synergistic gains in energy efficiency optimization, space utilization, and power quality: energy efficiency is reflected in minimizing inefficient energy conversion; space efficiency is reflected in freeing up critical wiring channels; and power quality is reflected in improved voltage accuracy and noise immunity at the load end, providing a highly efficient and robust power supply solution for portable electronic devices.

[0038] In some preferred embodiments, the above step of "controlling the adapter 80 to output a corresponding voltage based on the type of the adapter 80" specifically includes: if the adapter 80 supports the PD protocol, controlling the adapter 80 to output a 12V voltage; if the adapter 80 does not support the PD protocol, controlling the adapter 80 to output a 5V voltage.

[0039] In specific implementation, a differentiated control strategy based on the adapter 80's protocol support capability (outputting 12V if it supports the PD protocol and 5V if it does not) allows the system to always operate in the optimal energy efficiency range. When the adapter 80 supports the PD protocol, the 12V high-voltage input can reduce transmission loss and improve the conversion efficiency of the power management IC (Buck conversion efficiency under high-voltage difference is better than buck-boost under low-voltage difference); while for ordinary adapter 80, directly outputting 5V avoids invalid conversion. For example, in a portable router scenario, if the user uses a PD fast charging head, the circuit automatically selects 12V input to give full play to the efficient buck characteristics of the power management IC; if an ordinary charger is used, the 5V input is directly passed to avoid secondary energy conversion. This adaptive mechanism solves the inherent contradiction of "first buck and then boost" in the 5V input scenario from the source, effectively improving system efficiency over the entire input range while reducing chip heat loss.

[0040] In some preferred embodiments, the input voltage range of the wide voltage input power management IC 30 is 4V-23V.

[0041] Specifically, the wide-voltage input power management IC30's wide input range (4V–23V) makes it compatible with a variety of input scenarios, including the 9V / 12V high voltages of the PD protocol, the 80V / 5V of standard adapters, and low-voltage inputs when powered by batteries (such as a 4.2V lithium battery). This feature overcomes the strict input voltage limitations of traditional circuits: when the input voltage fluctuates between 23V and 5V, a single power management IC can complete the step-down conversion; when the input drops below 5V (such as 4.5V), it automatically switches to boost mode to ensure a constant 5V output.

[0042] In some preferred embodiments, the first load 40 is a radio frequency front-end module.

[0043] In specific implementations, the RF front-end module (FEM) is directly connected to the 5V output as the first load 40, solving the problem of reduced voltage accuracy caused by multi-stage conversion in traditional power supply architectures. The FEM module is extremely sensitive to supply voltage. The actual supply voltage of 4.2V in traditional solutions would limit its RF signal gain (for example, the WiFi transmit power is attenuated by 15%). This design eliminates the intermediate conversion link, allowing the FEM to obtain a precise 5V power supply. This not only increases the signal gain to the theoretical maximum, but also reduces the communication bit error rate due to the enhanced voltage stability. For example, in a portable router, a direct 5V supply can increase the WiFi coverage radius by 20%, while also avoiding RF parameter drift caused by voltage fluctuations.

[0044] In some preferred embodiments, the first load 40 is a fan.

[0045] In practice, fans can operate at full speed when powered directly by 5V. Conventional 4.2V power supplies require a boost circuit, which not only increases component cost but also generates electromagnetic noise that interferes with RF signals. This design simplifies the power supply path, reduces fan power consumption, and reduces high-frequency harmonic radiation, improving system EMC performance. For example, in a highly loaded router, a 5V direct-drive fan can improve heat dissipation efficiency while avoiding interference with the 2.4GHz band.

[0046] In some preferred embodiments, the model of the wide voltage input power management IC 30 is TMI2605, and the model of the PD protocol chip 20 is ETA7906D2K.

[0047] In specific implementation, a chip combination of the TMI2605 and ETA7906D2K is used to achieve hardware-level optimization for protocol identification and wide-voltage conversion. The TMI2605's unique single-inductor Buck-Boost architecture automatically enters bypass mode when the input voltage approaches 5V, achieving a conversion efficiency of 98%. The ETA7906D2K's fast protocol negotiation (<100ms) ensures fast power path switching. For example, when a PD adapter 80 is plugged in, the ETA7906D2K completes the protocol handshake and outputs 12V in 0.1 seconds. The TMI2605 simultaneously initiates efficient Buck conversion, achieving a 5x improvement in speed compared to conventional chip solutions, significantly reducing the risk of voltage surges during switching.

[0048] In some preferred embodiments, the PD protocol-based power supply circuit further includes a solid-state capacitor 50 , and the solid-state capacitor 50 is connected to the input terminal of the wide-voltage input power management IC 30 .

[0049] In practice, the solid-state capacitor 50 connected in parallel at the input forms a transient current buffer barrier, suppressing voltage oscillations caused by plugging and unplugging the adapter 80 or sudden load changes. Traditional electrolytic capacitors, due to their high ESR, cannot effectively absorb nanosecond current spikes, causing the power management IC to trigger overvoltage protection. The low ESR characteristics of the solid-state capacitor 50 (<5mΩ) can instantly absorb sudden currents of up to 6A. For example, when a fan suddenly starts, it prevents the input voltage from dropping below 4V, ensuring that the power supply to the RF module is not disturbed.

[0050] In some preferred embodiments, the PD protocol-based power supply circuit further includes a voltage conversion circuit 60 and a second load 70, and the wide voltage input power management IC 30 is connected to the second load 70 via the voltage conversion circuit 60. In some preferred embodiments, the voltage conversion circuit 60 is a DC-DC circuit.

[0051] In an embodiment of the present invention, the additional DC-DC voltage conversion circuit 60 and the second load 70 form a secondary power supply branch. While maintaining a 405V direct supply to the first load, this branch expands support for loads in other voltage domains (such as a 3.3V main control chip). The type of second load 70 can be set according to actual needs and is not specifically limited by the present invention. For example, when the wide-voltage input power management IC 30 outputs 5V, the DC-DC circuit steps it down to 3.3V and supplies it to the second load 70, forming a hybrid "first-stage direct supply + second-stage conversion" architecture. This design not only retains the advantages of efficient direct supply to critical loads, but also avoids voltage instability caused by multiple loads in parallel through tiered power supply. It is particularly suitable for complex systems requiring multiple voltage domains (such as routers integrating a 5V FEM and a 3.3V CPU), and its overall efficiency is still higher than traditional solutions. The number of second loads 70 can be multiple, which is not specifically limited by the present invention. For example, the second loads 70 include LCDs (liquid crystal displays) and DDR (double data rate synchronous dynamic random access memory).

[0052] An embodiment of the present invention provides a router, which includes the PD protocol-based power supply circuit provided in any of the above embodiments.

[0053] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0056] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0058] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0059] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, to the extent such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to encompass such changes and modifications.

[0060] The above description is a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A power supply circuit based on the PD protocol, characterized in that: include: Input interface, used to connect the adapter; A PD protocol chip, connected to the input interface, configured to detect the type of the adapter and control the adapter to output a corresponding voltage based on the adapter type; A wide voltage input power management IC is connected to the output terminal of the PD protocol chip and is used to output a constant 5V voltage; The first load is connected to the wide voltage input power management IC and receives a constant 5V voltage output by the wide voltage input power management IC.

2. The power supply circuit based on the PD protocol according to claim 1, characterized in that: The controlling the voltage corresponding to the output of the adapter based on the type of the adapter includes: If the adapter supports the PD protocol, control the adapter to output a 12V voltage; If the adapter does not support the PD protocol, control the adapter to output a 5V voltage.

3. The power supply circuit based on the PD protocol according to claim 1, characterized in that: The input voltage range of the wide voltage input power management IC is 4V–23V.

4. The power supply circuit based on the PD protocol according to claim 1, characterized in that: The first load is a radio frequency front-end module.

5. The power supply circuit based on the PD protocol according to claim 1, characterized in that: The first load is a fan.

6. The power supply circuit based on the PD protocol according to claim 1, characterized in that: The model of the wide voltage input power management IC is TMI2605, and the model of the PD protocol chip is ETA7906D2K.

7. The power supply circuit based on the PD protocol according to claim 1, characterized in that: The power supply circuit based on the PD protocol further includes a solid-state capacitor, which is connected to the input terminal of the wide-voltage input power management IC.

8. The power supply circuit based on the PD protocol according to claim 1, characterized in that: The power supply circuit based on the PD protocol further includes a voltage conversion circuit and a second load, and the wide voltage input power management IC is connected to the second load through the voltage conversion circuit.

9. The power supply circuit based on the PD protocol according to claim 8, characterized in that: The voltage conversion circuit is a DC-DC circuit.

10. A router, characterized in that: The router includes a power supply circuit based on the PD protocol according to any one of claims 1 to 9.

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