PD equipment and power supply system

Abstract

The utility model provides a PD device and a power supply system, and relates to the technical field of power supply, the PD device comprises a PD chip and a plurality of power supply network ports; the PD chip is connected with each power supply network port, and the power supply network ports are used for being connected with PSE equipment; and the PD chip is used for feeding back a matching signal to the corresponding PSE equipment when detecting a detection signal sent by the PSE equipment connected with any power supply network port, so that the PSE equipment outputs a power supply signal to supply power to the PD equipment when receiving the matching signal. According to the utility model, the power supply network ports are connected in parallel and then are connected with the PD chip, when any one of the power supply network ports is connected to the PSE equipment, the connected PSE equipment can supply power to the PD equipment, and a user does not need to repeatedly plug and pull to detect which PSE equipment interface is the power supply network port, so that the use method of the PD equipment is simplified, and the use efficiency of the PD equipment is improved. And the phenomenon that the PD cannot be used due to wrong interface insertion of a user is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a PD device and a power supply system. Background Art

[0002] In the prior art, a power over Ethernet (PoE) system is often used to provide DC power to devices such as IP phones and network cameras that transmit data signals by wire. In a PoE system, a power sourcing equipment (PSE) is often used to power a power management device (PD). However, a traditional PD device only has one fixed network port that supports the PSE device to power it, and the other network ports are only used for data transmission. If the PSE device used for power supply is inserted into a network port that is not used for power supply, the PD device cannot receive normal power supply, resulting in the PD device not being able to work properly. Utility Model Content

[0003] The utility model provides a PD device and a power supply system, aiming to solve the technical problem of how to ensure that the PSE device can supply power to the PD device when the PD device is blindly plugged into the PSE device.

[0004] Based on the above purpose, the embodiment of the utility model provides a PD device, the PD device comprising: a PD chip and a plurality of power supply network ports;

[0005] The PD chip is connected to each of the power supply network ports, and the power supply network ports are used to connect to the PSE device;

[0006] The PD chip is used to feed back a matching signal to the corresponding PSE device when detecting a detection signal sent by a PSE device connected to any of the power supply network ports, so that the corresponding PSE device outputs a power supply signal to power the PD device when receiving the matching signal.

[0007] Optionally, the PD device further includes: a plurality of feature modules, a number of rectifier modules equal to the number of the feature modules, and a number of switch modules equal to the number of the feature modules;

[0008] The first end of each of the characteristic modules is connected to the control end of the corresponding switch module, the second end of each of the characteristic modules is connected to the first end of the corresponding switch module, the third end of each of the characteristic modules is connected to the detection pin of the PD chip, the second end of each of the switch modules is connected to the negative power supply pin of the PD chip, the first end of each of the characteristic modules is also connected to the positive power supply pin of the PD chip, the first end of each of the characteristic modules is also connected to the positive output end of the corresponding rectifier module, the second end of each of the characteristic modules is also connected to the negative output end of the corresponding rectifier module, and the first positive input end, the second positive input end, the first negative input end and the second negative input end of the rectifier module are connected to the corresponding power supply network port;

[0009] The characteristic module is used to output a characteristic signal to the PD chip when receiving the detection signal;

[0010] The PD chip is further configured to output the matching signal and forward it to the corresponding PSE device through the feature module when receiving the feature signal, so that the corresponding PSE device outputs a power supply signal to the switch module;

[0011] The rectifier module is used to rectify the detection signal or the power supply signal, and transmit the rectified detection signal or the power supply signal to the switch module and the PD chip;

[0012] The switch module is used to open the power supply circuit between the corresponding PSE device and the PD chip when receiving the power supply signal, and transmit the power supply signal to the PD chip.

[0013] Optionally, the characteristic module includes: a first resistor and a first capacitor;

[0014] The first end of the first capacitor is respectively connected to the first end of the first resistor, the control end of the corresponding switch module and the positive power supply pin of the PD chip, the second end of the first capacitor is connected to the first end of the corresponding switch module, and the second end of the first resistor is connected to the detection pin of the PD chip;

[0015] The first end of the first capacitor is also connected to the positive output end of the corresponding rectifier module, and the second end of the first capacitor is also connected to the negative output end of the corresponding rectifier module.

[0016] Optionally, the switch module includes: a second resistor, a third resistor, a first voltage regulator diode and a first NMOS tube;

[0017] The gate of the first NMOS tube is respectively connected to the cathode of the first voltage stabilizing diode, the second end of the second resistor and the first end of the third resistor, the drain of the first NMOS tube is respectively connected to the second end of the third resistor and the anode of the first voltage stabilizing diode, the source of the first NMOS tube is connected to the negative power supply pin of the PD chip, and the first end of the second resistor is connected to the positive power supply pin of the PD chip;

[0018] The first end of the second resistor is also connected to the positive output end of the corresponding rectifier module, and the second end of the third resistor is also connected to the negative output end of the corresponding rectifier module.

[0019] Optionally, the rectifier module includes: first to eighth rectifier diodes;

[0020] The anode of the first rectifier diode is respectively connected to the anode of the second rectifier diode, the anode of the fifth rectifier diode, the anode of the sixth rectifier diode and the second end of the corresponding characteristic module, the cathode of the first rectifier diode is respectively connected to the first end of the corresponding power supply network port and the anode of the third rectifier diode, the cathode of the third rectifier diode is respectively connected to the cathode of the fourth rectifier diode, the cathode of the seventh rectifier diode, the cathode of the eighth rectifier diode and the first end of the corresponding characteristic module, the cathode of the second rectifier diode is respectively connected to the anode of the fourth rectifier diode and the second end of the corresponding power supply network port, the cathode of the fifth rectifier diode and the anode of the seventh rectifier diode are connected to the third end of the corresponding power supply network port, and the cathode of the sixth rectifier diode and the anode of the eighth rectifier diode are connected to the fourth end of the corresponding power supply network port.

[0021] Optionally, the PD device further includes: ninth rectifier diodes having the same number as the characteristic modules;

[0022] The anode of each of the ninth rectifier diodes is connected to the first end of the feature module, the control end of the corresponding switch module and the positive output end of the corresponding rectifier module, and the cathode of each of the ninth rectifier diodes is connected to the positive power supply pin of the PD chip.

[0023] Optionally, the PD device further includes: a TVS tube;

[0024] The first end of the TVS tube is connected to the positive power supply pin of the PD chip, and the second end of the TVS tube is connected to the negative power supply pin of the PD chip.

[0025] Optionally, the PD chip is further configured to stop sending the matching signal to each of the PSE devices when receiving the power supply signal.

[0026] In addition, to achieve the above purpose, an embodiment of the utility model further proposes a power supply system, which includes: multiple PSE devices and the PD device as described above, and each of the PSE devices is connected to the PD device through each power supply network port.

[0027] The embodiment of the utility model provides a PD device and a power supply system, wherein the PD device includes: a PD chip and a plurality of power supply network ports; the PD chip is connected to each of the power supply network ports, and the power supply network port is used to connect to a PSE device; the PD chip is used to feed back a matching signal to the corresponding PSE device when detecting a detection signal sent by a PSE device connected to any of the power supply network ports, so that the PSE device outputs a power supply signal to power the PD device when receiving the matching signal. The utility model connects each power supply network port in parallel with the PD chip, and when the PSE device is connected through any of the power supply network ports, the connected PSE device can power the PD device, without the need for the user to repeatedly plug and unplug to detect which PSE device's interface is the power supply network port, thereby simplifying the use of the PD device and preventing the PD device from being unusable due to the user plugging in the wrong interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the structural connection of the first embodiment of the PD device of the utility model;

[0030] Figure 2 This is a circuit connection diagram of the second embodiment of the PD device of the utility model;

[0031] Figure 3 This is a circuit connection diagram of the third embodiment of the PD device of the present utility model.

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] The present utility model embodiment provides a PD device, referring to Figure 1 , Figure 1 This is a schematic diagram of the structural connection of the first embodiment of the PD device of the utility model.

[0037] like Figure 1 As shown, in this embodiment, the PD device E1 includes: a PD chip U0 and a plurality of power supply network ports Pt;

[0038] The PD chip U0 is connected to each of the power supply network ports Pt, and the power supply network port Pt is used to connect to the PSE device E0;

[0039] The PD chip U0 is used to feed back a matching signal to the corresponding PSE device E0 when detecting a detection signal sent by a PSE device E0 connected to any of the power supply network ports Pt, so that the corresponding PSE device E0 outputs a power supply signal to power the PD device E1 when receiving the matching signal.

[0040] It should be understood that, in order to achieve power supply safety, the PSE device E0 will not directly output a high-voltage power supply signal to the connected circuit, but will first output a low-voltage detection signal to the PD device E1 to detect whether the PD device E1 is a legal PD device. If the PSE device E0 detects that the current PD device E1 is a legal PD device, it will then output a power supply signal to the PD device E1 to power the PD device E1. Among them, the PD device E1 is provided with multiple power supply network ports Pt. The PSE device E0 can form a connection loop with the PD device E1 by connecting to a certain power supply network port Pt, so that current is generated in the connection loop, which can be understood as the detection signal described above. In an embodiment, the power supply network port Pt can be an RJ45 interface.

[0041] It should be noted that the matching signal and the detection signal should be a pair of handshake signals. When the PSE device E0 sends the detection signal, it will also judge the currently connected PD device E1 by detecting the current value of the detection signal. If the PD device E1 is a legal PD device, it is equipped with a PD chip U0 corresponding to the power supply of the PSE device E0. When the PD chip U0 receives the detection signal, it will feedback a matching signal representing legality to the PSE device E0, so that the PSE device E0 can subsequently generate and output a high-voltage power supply signal to the PD device E1. The power supply signal is transmitted to the PD chip U0 in the PD device E1 through the power supply network port Pt, so that the PD device E1 can work normally; correspondingly, if the PD device E1 is an illegal PD device, there is no PD chip U0 corresponding to the power supply of the PSE device E0 inside, and the matching signal representing legality will not be fed back to the PSE device E0, and the PSE device E0 will not generate and output a power supply signal to the PD device E1, and the PD device E1 will not work normally.

[0042] It is easy to understand that the detection signal and the power supply signal can be distinguished by the voltage. The high voltage is the power supply signal, and the low voltage is the detection signal. In this embodiment, the voltage of the detection signal can be about 2.8 to 10V, and the voltage of the power supply signal can be about 50 to 57V. When the PSE device E0 outputs the detection signal to the PD device E1, it can determine whether the detection signal is a matching signal by detecting the electrical parameters of the detection signal sent to the PD. Among them, the electrical parameters of each matching signal are related to the model of the PSE device E0 and the corresponding model of the PD device E1, and are not specifically limited here.

[0043] It is worth noting that in this embodiment, if the power supply between the PD device E1 and the PSE device E0 matches each other, the PD chip U0 inside the PD device E1 will only feedback a matching signal to the first PSE device E0 that connects to the PD device E1 through the power network port Pt and sends a detection signal.

[0044] The embodiment of the utility model proposes a PD device, the PD device includes: a PD chip and multiple power supply network ports; the PD chip is connected to each of the power supply network ports, and the power supply network port is used to connect to a PSE device; the PD chip is used to feed back a matching signal to the corresponding PSE device when detecting a detection signal sent by a PSE device connected to any of the power supply network ports, so that the PSE device outputs a power supply signal to power the PD device when receiving the matching signal. The utility model connects each power supply network port in parallel with the PD chip, and when the PSE device is connected through any of the power supply network ports, the connected PSE device can power the PD device, without the user having to repeatedly plug and unplug to detect which PSE device's interface is the power supply network port, thereby simplifying the use of the PD device and preventing the PD device from being unusable due to the user plugging in the wrong interface.

[0045] Based on the first embodiment of the PD device of the utility model, a second embodiment of the PD device of the utility model is proposed, referring to Figure 2 , Figure 2 This is a circuit connection diagram of the second embodiment of the PD device of the utility model.

[0046] like Figure 2 As shown, in this embodiment, the PD device E1 further includes: a plurality of characteristic modules 10, a rectifier module 30 having the same number as the characteristic modules 10, and a switch module 20 having the same number as the characteristic modules 10;

[0047] The first end of each of the feature modules 10 is connected to the control end of the corresponding switch module 20, the second end of each of the feature modules 10 is connected to the first end of the corresponding switch module 20, the third end of each of the feature modules 10 is connected to the detection pin of the PD chip U0, the second end of each of the switch modules 20 is connected to the negative power supply pin of the PD chip U0, the first end of each of the feature modules 10 is also connected to the positive power supply pin of the PD chip U0, the first end of each of the feature modules 10 is also connected to the positive output end of the corresponding rectifier module 30, the second end of each of the feature modules 10 is also connected to the negative output end of the corresponding rectifier module 30, the first positive input end, the second positive input end, the first negative input end and the second negative input end of the rectifier module 30 are connected to the corresponding power supply network port Pt;

[0048] The characteristic module 10 is used to output a characteristic signal to the PD chip U0 when receiving the detection signal;

[0049] The PD chip U0 is further used to output the matching signal and forward it to the corresponding PSE device E0 through the feature module 10 when receiving the feature signal, so that the corresponding PSE device E0 outputs the power supply signal to the switch module 20;

[0050] The rectifier module 30 is used to rectify the detection signal or the power supply signal, and transmit the rectified detection signal or the power supply signal to the switch module 20 and the PD chip U0;

[0051] The switch module 20 is used to open the power supply circuit between the corresponding PSE device E0 and the PD chip U0 when receiving the power supply signal, and transmit the power supply signal to the PD chip U0.

[0052] It is easy to understand that the PSE device E0 can output multiple types of electrical signals through the power supply network port Pt, including at least a DC power supply signal and a differential signal for communication, and there are multiple implementations of the PSE device E0 outputting the power supply signal. For the PD chip U0, it is necessary to be compatible with all types of electrical signals output by the PSE device E0 and power supply signals of various implementations, and it is necessary to reverse the positive and negative polarity through the access sorting module 30 to avoid the risk of short-circuiting the positive and negative poles on the hardware due to the use of cross-cables.

[0053] It is worth noting that there are two power supply line sequences of the POE device E0, including data line pair Alternative A and idle line pair Alternative B. The data line pair Alternative A can be understood as a power supply line pair for power supply, which can be connected to the first positive input terminal, the second positive input terminal, the first negative input terminal and the second negative input terminal of the above-mentioned rectifier module 30 through the power supply network port Pt. Among them, corresponding to the power supply line sequence of the POE device E0, the power supply network port Pt has 1-8 lines, which respectively constitute 1&2 line pairs, 4&5 line pairs, 3&6 line pairs and 7&8 line pairs. If the power supply network port Pt is an RJ45 network port, the first positive input terminal can correspond to the 1&2 line pairs connected to the RJ45 network port, the second positive input terminal can correspond to the 4&5 line pairs connected to the RJ45 network port, the first negative input terminal can correspond to the 3&6 line pairs connected to the RJ45 network port, and the second negative input terminal can correspond to the 7&8 line pairs connected to the RJ45 network port.

[0054] It should be noted that when the PSE device E0 is connected to the power supply network port Pt and forms a connection loop with the PD chip U0, the feature module 10 is used to convert the detection signal in the connection loop into a matching signal. The detection signal of the feature module 10 will change its original electrical parameters to form a matching signal, so that when the PD chip U0 receives the feature signal, the PSE device E0 will also receive the matching signal.

[0055] It is easy to understand that the switch module 20 is used to control the on / off state of the connection circuit between the PD chip U0 and the PSE device E0. When the control end of the switch module 20 receives a high-voltage power supply signal sent by the PSE device E0, the connection circuit between the PD chip U0 and the PSE device E0 can be opened, so that the power supply signal can also be transmitted to the PD chip U0, thereby enabling the PD chip U0 to work normally, that is, the PD device E1 works normally.

[0056] Further, in this embodiment, the characteristic module 10 includes: a first resistor R1 and a first capacitor C1;

[0057] The first end of the first capacitor C1 is respectively connected to the first end of the first resistor R1, the control end of the corresponding switch module 20 and the positive power supply pin of the PD chip U0, the second end of the first capacitor C1 is connected to the first end of the corresponding switch module 20, and the second end of the first resistor R1 is connected to the detection pin of the PD chip U0;

[0058] The first end of the first capacitor C1 is also connected to the positive output end of the corresponding rectifier module 30 , and the second end of the first capacitor C1 is also connected to the negative output end of the corresponding rectifier module 30 .

[0059] It should be noted that the electrical parameters of the PSE device E0 identifying the matching signal mentioned above can be the charging and discharging time and the current value. The charging and discharging time corresponds to the high and low level duration of the matching signal, and the current value corresponds to the peak value of the matching signal. Correspondingly, the feature module 10 may include a first resistor R1 and a first capacitor C1. The first capacitor C1 can change the high and low level duration of the current in the connection loop between the PD chip U0 and the PSE device E0 through the energy storage characteristics, and the first resistor R1 can change the value of the current in the connection loop between the PD chip U0 and the PSE device E0. The PSE device E0 can judge whether the impedance and capacitive reactance in the connection loop formed by the feature module 10 and the PD chip U0 meet the legal judgment standard of the PSE device E0 through the high and low level duration of the above circuit and the value of the current, which can also be understood as judging whether the current PD device E1 is a legal PD device. In this embodiment, for a pair of PSE devices E0 and PD devices E1 of a certain type, the feature module 10 needs to meet the impedance of the PD device E1 to reach 23.7k~26.3k and the capacitive reactance to reach 0.05~0.12μF.

[0060] Furthermore, in this embodiment, the switch module 20 includes: a second resistor R2, a third resistor R3, a first voltage stabilizing diode ZD and a first NMOS transistor Q1;

[0061] The gate of the first NMOS transistor Q1 is respectively connected to the cathode of the first voltage zener diode ZD, the second end of the second resistor R2, and the first end of the third resistor R3; the drain of the first NMOS transistor Q1 is respectively connected to the second end of the third resistor R3 and the anode of the first voltage zener diode ZD; the source of the first NMOS transistor Q1 is connected to the negative power supply pin of the PD chip U0; and the first end of the second resistor R2 is connected to the positive power supply pin of the PD chip U0;

[0062] The first end of the second resistor R2 is also connected to the positive output end of the corresponding rectifier module 30 , and the second end of the third resistor R3 is also connected to the negative output end of the corresponding rectifier module 30 .

[0063] It should be noted that the second resistor R2 and the third resistor R3 are connected in series between the positive power supply pin and the negative power supply pin of the PD chip U0 to play the role of series voltage division, and the first voltage regulator diode ZD can ensure that the voltage across the third resistor R3 remains within a certain voltage range, thereby ensuring the stability of the on-off state switching of the first NMOS tube Q1.

[0064] It is easy to understand that when the PSE device E0 is connected to a power supply network port Pt and successfully matches with the PD device E1 and outputs a power supply signal, the control end of the first NMOS tube Q1 receives a high-level signal through the voltage-dividing structure of the second resistor R2 and the third resistor R3, and opens the connection loop between the PD chip U0 and the PSE device E0, so that the PD chip U0 can receive the power supply signal of the PSE device E0, which can be understood as the PD chip U0 can work normally. When the PSE device E0 does not output a power supply signal to the PD device E1, the control end of the first NMOS tube Q1 receives a low-level signal, cuts off the connection loop between the PD chip U0 and the PSE device E0, and prevents the corresponding PSE device E0 from powering the PD device E1.

[0065] Further, in this embodiment, the rectifier module 30 includes: a first rectifier diode D1 to an eighth rectifier diode D8;

[0066] The anode of the first rectifier diode D1 is respectively connected to the anode of the second rectifier diode D2, the anode of the fifth rectifier diode D5, the anode of the sixth rectifier diode D6 and the second end of the corresponding characteristic module 10, the cathode of the first rectifier diode D1 is respectively connected to the first end of the corresponding power supply network port Pt and the anode of the third rectifier diode D3, the cathode of the third rectifier diode D3 is respectively connected to the cathode of the fourth rectifier diode D4, the cathode of the seventh rectifier diode D7, the cathode of the eighth rectifier diode D8 and the first end of the corresponding characteristic module 10, the cathode of the second rectifier diode D2 is respectively connected to the anode of the fourth rectifier diode D4 and the second end of the corresponding power supply network port Pt, the cathode of the fifth rectifier diode D5 and the anode of the seventh rectifier diode D7 are connected to the third end of the corresponding power supply network port Pt, and the cathode of the sixth rectifier diode D6 and the anode of the eighth rectifier diode D8 are connected to the fourth end of the corresponding power supply network port Pt.

[0067] It is easy to understand that the rectifier module 30 can be obtained by forming two rectifier bridges through the first rectifier diode D1 to the eighth rectifier diode D8, and the four input ends of the two rectifier bridges can be connected to the power supply network port Pt through four interfaces from the first end to the fourth end, and the two output ends of the two rectifier bridges can be connected to each feature module 10 through the positive power supply pin of the PD chip U0 and the first end of the switch module 20 corresponding to the power supply network port Pt, so that the signals received by the PD chip U0 are all DC signals, that is, they can be compatible with all types of electrical signals output by the PSE device E0, avoiding the risk of short circuit of positive and negative poles in hardware due to the use of cross-network cables.

[0068] Based on the second embodiment of the PD device of the utility model, a third embodiment of the PD device of the utility model is proposed, referring to Figure 3 , Figure 3 This is a circuit connection diagram of the third embodiment of the PD device of the present utility model.

[0069] like Figure 3 As shown, in this embodiment, the PD device E1 further includes: ninth rectifier diodes D9, the same number as the characteristic module 10;

[0070] The anode of each of the ninth rectifier diodes D9 is connected to the first end of the feature module 10, the control end of the corresponding switch module 20 and the positive output end of the corresponding rectifier module 30, and the cathode of each of the ninth rectifier diodes D9 is connected to the positive power supply pin of the PD chip U0.

[0071] It should be noted that when there are multiple PSE devices E0 connected to the PD device E1, the PSE device E0 that is first connected to a power supply network port Pt has powered the PD chip U0 inside the PD device E1, and then the PSE device E0 that is connected to another power supply network port Pt will also send a detection signal to the PD chip U0, which may cause the detection signal to flow back to other connected PSE devices E0, thereby affecting the electrical parameters of other PSE devices E0 when collecting erroneous detection signals, and thus failing to implement the detection process of the subsequent connected PSE device E0.

[0072] It is easy to understand that a ninth rectifier diode D9 is arranged between the first end of the characteristic module 10 connected to each power supply network port Pt and the control end of the switch module 20 and the positive power supply pin of the PD chip U0, so that the detection signal sent by the PSE device E0 connected to the power supply network port Pt will only be transmitted to the PD chip U0 and will not be transmitted to other PSE devices E0, thereby ensuring that the PSE devices E0 connected to each power supply network port Pt do not interfere with each other.

[0073] Furthermore, in this embodiment, the PD device E1 further includes: a TVS tube TD;

[0074] The first end of the TVS tube TD is connected to the positive power supply pin of the PD chip U0, and the second end of the TVS tube TD is connected to the negative power supply pin of the PD chip U0.

[0075] It is easy to understand that in this embodiment, in order to ensure that the voltage between the positive power supply pin and the negative power supply pin of the PD chip U0 is stable within the rated operating voltage range for the normal operation of the PD chip U0 when multiple PSE devices E0 are connected, a TVS tube TD is provided between the positive power supply pin and the negative power supply pin of the PD chip U0 to prevent the voltage value and fluctuation value received by the PD chip U0 from exceeding the rated operating voltage range, thereby ensuring the working stability of the PD chip U0. In this embodiment, the rated operating voltage range can be 50-57V.

[0076] Furthermore, in this embodiment, the PD chip U0 is further configured to stop sending the matching signal to each of the PSE devices E0 when receiving the power supply signal.

[0077] It is easy to understand that in this embodiment, if the PD chip U0 has received the power supply signal, even if there is a subsequent PSE device E0 connected to the PD device E1 and sends a detection signal to the PD chip U0, the PD chip U0 will not output a feedback signal to the PSE device E0 that is subsequently connected to the power supply network port Pt. For details, please refer to the feature module 10 described above. Since each feature module 10 is in a parallel state, the PSE device E0 that is subsequently connected to the power supply network port Pt has changed the impedance or capacitance corresponding to the current in the connection loop formed by the feature module 10 and the PD chip U0, so that the electrical signal fed back by the PD chip U0 cannot reach the electrical parameters of the matching signal, that is, the matching signal is no longer fed back to the subsequent PSE device E0. Correspondingly, the subsequent PSE device E0 no longer outputs a power supply signal to power the PD chip U0, so that only the first PSE device E0 that is connected to the power supply network port Pt and successfully matches the PD device E1 can power the PD chip U0.

[0078] To achieve the above object, the utility model also proposes a power supply system, the power supply system comprising: a plurality of PSE devices and the PD device as described above, each of the PSE devices being connected to the PD device via each power supply network port. Since the power supply system adopts the PD device as described above, it has at least all the beneficial effects of all the embodiments of the PD device as described above, which will not be described one by one here.

[0079] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

[0080] It is worth noting that in the actual application of the present utility model, software programs will inevitably be applied, but the applicant hereby declares that the software programs applied in the specific implementation of the technical solution are all prior art. In this application, it does not involve the modification and protection of software programs, but only the protection of the hardware architecture designed to achieve the purpose of the utility model.

Claims

1. A PD device, characterized in that: The PD device includes: a PD chip and multiple power supply network ports; The PD chip is connected to each of the power supply network ports, and the power supply network ports are used to connect to the PSE device; The PD chip is used to feed back a matching signal to the corresponding PSE device when detecting a detection signal sent by a PSE device connected to any of the power supply network ports, so that the corresponding PSE device outputs a power supply signal to power the PD device when receiving the matching signal.

2. The PD device according to claim 1, characterized in that: The PD device further comprises: a plurality of characteristic modules, a rectifier module having the same number as the characteristic modules, and a switch module having the same number as the characteristic modules; The first end of each of the characteristic modules is connected to the control end of the corresponding switch module, the second end of each of the characteristic modules is connected to the first end of the corresponding switch module, the third end of each of the characteristic modules is connected to the detection pin of the PD chip, the second end of each of the switch modules is connected to the negative power supply pin of the PD chip, the first end of each of the characteristic modules is also connected to the positive power supply pin of the PD chip, the first end of each of the characteristic modules is also connected to the positive output end of the corresponding rectifier module, the second end of each of the characteristic modules is also connected to the negative output end of the corresponding rectifier module, and the first positive input end, the second positive input end, the first negative input end and the second negative input end of the rectifier module are connected to the corresponding power supply network port; The characteristic module is used to output a characteristic signal to the PD chip when receiving the detection signal; The PD chip is further configured to output the matching signal and forward it to the corresponding PSE device through the feature module when receiving the feature signal, so that the corresponding PSE device outputs a power supply signal to the switch module; The rectifier module is used to rectify the detection signal or the power supply signal, and transmit the rectified detection signal or the power supply signal to the switch module and the PD chip; The switch module is used to open the power supply circuit between the corresponding PSE device and the PD chip when receiving the power supply signal, and transmit the power supply signal to the PD chip.

3. The PD device according to claim 2, characterized in that: The characteristic module includes: a first resistor and a first capacitor; The first end of the first capacitor is respectively connected to the first end of the first resistor, the control end of the corresponding switch module and the positive power supply pin of the PD chip, the second end of the first capacitor is connected to the first end of the corresponding switch module, and the second end of the first resistor is connected to the detection pin of the PD chip; The first end of the first capacitor is also connected to the positive output end of the corresponding rectifier module, and the second end of the first capacitor is also connected to the negative output end of the corresponding rectifier module.

4. The PD device according to claim 2, characterized in that: The switch module includes: a second resistor, a third resistor, a first voltage regulator diode and a first NMOS tube; The gate of the first NMOS tube is respectively connected to the cathode of the first voltage stabilizing diode, the second end of the second resistor and the first end of the third resistor, the drain of the first NMOS tube is respectively connected to the second end of the third resistor and the anode of the first voltage stabilizing diode, the source of the first NMOS tube is connected to the negative power supply pin of the PD chip, and the first end of the second resistor is connected to the positive power supply pin of the PD chip; The first end of the second resistor is also connected to the positive output end of the corresponding rectifier module, and the second end of the third resistor is also connected to the negative output end of the corresponding rectifier module.

5. The PD device according to claim 2, characterized in that: The rectifier module comprises: a first rectifier diode to an eighth rectifier diode; The anode of the first rectifier diode is respectively connected to the anode of the second rectifier diode, the anode of the fifth rectifier diode, the anode of the sixth rectifier diode and the second end of the corresponding characteristic module, the cathode of the first rectifier diode is respectively connected to the first end of the corresponding power supply network port and the anode of the third rectifier diode, the cathode of the third rectifier diode is respectively connected to the cathode of the fourth rectifier diode, the cathode of the seventh rectifier diode, the cathode of the eighth rectifier diode and the first end of the corresponding characteristic module, the cathode of the second rectifier diode is respectively connected to the anode of the fourth rectifier diode and the second end of the corresponding power supply network port, the cathode of the fifth rectifier diode and the anode of the seventh rectifier diode are connected to the third end of the corresponding power supply network port, and the cathode of the sixth rectifier diode and the anode of the eighth rectifier diode are connected to the fourth end of the corresponding power supply network port.

6. The PD device according to claim 2, characterized in that: The PD device further includes: ninth rectifier diodes having the same number as the characteristic modules; The anode of each of the ninth rectifier diodes is connected to the first end of the feature module, the control end of the corresponding switch module and the positive output end of the corresponding rectifier module, and the cathode of each of the ninth rectifier diodes is connected to the positive power supply pin of the PD chip.

7. The PD device according to claim 2, characterized in that: The PD device also includes: a TVS tube; The first end of the TVS tube is connected to the positive power supply pin of the PD chip, and the second end of the TVS tube is connected to the negative power supply pin of the PD chip.

8. The PD device according to any one of claims 1 to 7, characterized in that: The PD chip is further configured to stop sending the matching signal to each of the PSE devices when receiving the power supply signal.

9. A power supply system, characterized in that: The power supply system comprises: a plurality of PSE devices and a PD device according to any one of claims 1 to 8, wherein each of the PSE devices is connected to the PD device via a power supply network port.

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