System and method for network cascading power and communication

Abstract

The application provides a system and method for network cascading power receiving and communication, which comprises: a power supply device for providing a power supply voltage; at least two cascaded power receiving devices, a first power receiving device being connected with the power supply device and receiving power from the power supply device; the power receiving device for power supply of a next stage comprising a first network interface, a second network interface and a relay; the first network interface or the second network interface supplies power to the power receiving device after receiving power; the relay is connected with the first network interface and the second network interface respectively, and shorts the power supply pins of the first network interface and the second network interface after being turned on, thereby supplying power to the power receiving device of the next stage through the first network interface or the second network interface. The application short-circuits the power supply pins of the two network interfaces of the power receiving device through the relay, thereby realizing the function of the power receiving device continuing to supply power to the power receiving device of the next stage after receiving power.

Description

Technical Field

[0001] This invention relates to the field of lighting control, and in particular to a system and method for network-cascaded power receiving and communication. Background Technology

[0002] PoE (Power Over Ethernet) is a technology that transmits limited low-voltage DC power over standard communication cables. It means that power and Ethernet data are transmitted simultaneously over a single network cable. A PoE system consists of Power Sourcing Equipment (PSE) and Powered Devices (PDs) connected by a network cable. The PSE is used to supply power to other devices, and the PD is used to receive power in the PoE system. In a standard PoE power supply operation, the PSE and PD devices should be standard PoE devices with PoE protocol modules compatible with the IEEE 802.3AF / AT standard; PoE devices without PoE protocol modules are generally called non-standard PoE devices, including non-standard PSEs and non-standard PDs.

[0003] Standard PoE employs a series of handshake protocols, with the supply voltage provided in stages. When the PSE and PD are connected via an Ethernet cable, the PD provides a characteristic resistance to the PSE. The PSE then provides a safe-range detection voltage of 2.7V to 10.1V, performs at least two current measurements within 500ms, and ensures a voltage difference of at least 1V between the two test points. When the detection characteristic resistance is within a predetermined range, the PSE performs power classification on the PD and outputs the rated voltage. Existing standard PoE does not support cascading power supply for powered devices, limiting its application. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a system and method for network cascaded power receiving and communication, which solves the technical problem that the prior art cannot provide power to cascaded power receiving devices.

[0005] To achieve the above and other related objectives, the present invention provides a network cascaded power receiving and communication system, comprising: a power supply device for providing a power supply voltage; at least two cascaded power receiving devices, wherein a first-level power receiving device is connected to the power supply device and receives power from the power supply device; wherein the power receiving device supplying power to the next level includes: a first network interface, a second network interface, and a relay; the first network interface or the second network interface supplies power to its respective power receiving device after receiving power; the relay is connected to the first network interface and the second network interface respectively, and after being turned on, short-circuits the power supply pins of the first network interface and the second network interface, thereby supplying power to the next-level power receiving device through the first network interface or the second network interface.

[0006] In one embodiment of the present invention, the power supply device includes: a main power supply circuit module, a power supply module, a power supply network transformer, and a power supply port; the main circuit module is connected to the power supply port through the network transformer; and is connected to the network transformer.

[0007] In one embodiment of the present invention, the network transformer includes a plurality of primary windings, the two ends of each primary winding being connected to the pins of the power supply port; wherein, the middle taps of two of the primary windings are respectively connected to the positive and negative terminals of the power supply module, and the middle taps of the remaining primary windings are respectively connected to the power supply port and the same power polarity terminal of the power supply module.

[0008] In one embodiment of the present invention, the power receiving device supplying power to the next level includes a main power receiving circuit module, a power supply module, a first power receiving network transformer, and a second power receiving network transformer. The first network interface and the second network interface are respectively connected to the main power receiving circuit module via the first and second power receiving network transformers. The first and second power receiving network transformers each include multiple primary windings. The two ends of each primary winding of the first power receiving network transformer are respectively connected to pins of the first power supply network port, and the two ends of each primary winding of the second power receiving network transformer are respectively connected to pins of the second power supply network port. The first network interface or the second network interface is connected to the power supply module, and the relay is connected to the main power receiving circuit module. The main power receiving circuit module controls the relay to short-circuit the power supply pins of the first and second network interfaces after the relay is turned on.

[0009] In one embodiment of the present invention, the first network interface serves as a main network interface, used to receive power from a power supply device or the previous-level power receiving device, and is connected to the positive and negative terminals of the power module respectively to supply power to the power module; the second network interface serves as a slave network interface, connected to the negative terminal of the power module, and is used to connect the power supply pin of the positive terminal of the relay with the power supply pin of the first network interface when the relay is turned on, to supply power to the next-level power receiving device.

[0010] In one embodiment of the present invention, the ground pins of the first network interface and the second network interface are shorted and then connected in series with a diode, which is then connected in parallel to the power module of the power receiving module.

[0011] In one embodiment of the present invention, the ground pins of the first network interface and the second network interface are shorted and then connected to a rectifier bridge, and then connected in parallel to the power module of the power receiving module.

[0012] In one embodiment of the present invention, the power supply pins of the first network interface and the second network interface are respectively connected to the relay, and after the relay is turned on, the power supply pins of the first network interface and the second network interface are short-circuited.

[0013] In one embodiment of the present invention, when the main power receiving circuit module detects that the voltage value of the power supply module has reached a preset value, it controls the relay to conduct after a preset delay to supply power to the next level power receiving device.

[0014] To achieve the above and other related objectives, the present invention also provides a method for network cascaded power receiving and communication, applied to a system comprising a power supply device and at least two cascaded power receiving devices, wherein the power receiving device supplying power to the next level includes: a first network interface, a second network interface, and a relay; the method includes: a first-level power receiving device obtaining a power supply voltage from the power supply device through the first network interface or the second network interface; when the voltage of the first-level power receiving device reaches a preset value, controlling the relay to conduct after a preset delay; after the relay conducts, short-circuiting the power supply pins of the first network interface and the second network interface, and supplying power to the second-level power receiving device through the first network interface or the second network interface; when the second-level power receiving device needs to supply power to the next-level power receiving device, it has the same structure as the first-level power receiving device and repeats the power supply control process of the first-level power receiving device; and so on, until the last-level power receiving device is powered and does not need to supply power to the next-level power receiving device, thus ending the power supply control.

[0015] As described above, the network cascaded power receiving and communication system and method of the present invention have the following beneficial effects:

[0016] (1) The present invention uses a relay to short-circuit the power supply pins of the two network interfaces of the powered device, so that the powered device can continue to supply power to the next level of powered device after receiving power, effectively solving the technical problem that the existing technology cannot supply power to the cascaded powered devices.

[0017] (2) The present invention is easy to install, and can save cables and sockets, reduce costs and the size of communication equipment.

[0018] (3) The present invention can negotiate power supply and supply power through bus, without the drawback of exponential decay of power efficiency cascaded. Attached Figure Description

[0019] Figure 1 The diagram shown is a system principle block diagram of network cascaded power receiving and communication according to one embodiment of the present invention.

[0020] Figure 2 The diagram shown is a schematic block diagram of the power supply equipment in a network cascaded power receiving and communication system according to an embodiment of the present invention.

[0021] Figure 3 The diagram shown is a circuit schematic of the power supply device in a network cascaded power receiving and communication system according to an embodiment of the present invention.

[0022] Figure 4 The diagram shown is a schematic block diagram of the power receiving device in a network cascaded power receiving and communication system according to an embodiment of the present invention.

[0023] Figure 5 The diagram shown is a circuit schematic of a power receiving device in a network cascaded power receiving and communication system according to an embodiment of the present invention.

[0024] Figure 6 The diagram shown is a circuit schematic of a network cascaded power receiving and communication system according to an embodiment of the present invention.

[0025] Figure 7 This diagram illustrates a connection of two network interfaces of a powered device in a network-cascaded power receiving and communication system according to one embodiment of the present invention.

[0026] Figure 8 This diagram illustrates another connection of two network interfaces of a powered device in a network-cascaded power receiving and communication system according to one embodiment of the present invention.

[0027] Figure 9 The diagram shown is a schematic of a rectifier in a network cascaded power receiving and communication system according to one embodiment of the present invention.

[0028] Component designation explanation

[0029] 100 Network Cascaded Power Receiving and Communication Systems

[0030] 110 Power supply equipment

[0031] 111 Power Supply Main Circuit Module

[0032] 112 Power Supply Module

[0033] 113 Power supply network transformer

[0034] 113a First primary winding

[0035] 113b Second Primary Winding

[0036] 113c Third Primary Winding

[0037] 113d Fourth Primary Winding

[0038] 114 Power supply port

[0039] 120 Power receiving equipment

[0040] 121 First Network Interface

[0041] 121a rectifier bridge

[0042] 122 Second Network Interface

[0043] 122a rectifier bridge

[0044] 123 Relay

[0045] 124 Power Receiving Main Circuit Module

[0046] 125 Power Module

[0047] 126 First power receiving network transformer

[0048] 126a First primary winding

[0049] 126b Second Primary Winding

[0050] 126c Third primary winding

[0051] 126d Fourth Primary Winding

[0052] 127 Second power receiving network transformer

[0053] 127a First primary winding

[0054] 127b Second Primary Winding

[0055] 127c Third Primary Winding

[0056] 127d Fourth primary winding Detailed Implementation

[0057] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0058] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0059] This embodiment provides a system and method for network cascaded power receiving and communication, realizing standardized cascaded power receiving and communication, and supporting a 1-in-many-out cascaded mode. By controlling the common mode points of different devices to be shorted together through relays, a bus power supply mode is formed without affecting the communication of the twisted pair. The relays are used to sequentially open the power circuit of the next level power receiving device, which can successfully pass the negotiation detection of the characteristic resistance of the power receiving device.

[0060] The following will elaborate on the principles and implementation methods of the network cascaded power receiving and communication system and method of the present invention, so that those skilled in the art can understand the concept of the present invention without creative effort.

[0061] Figure 1 The diagram shown is a schematic block diagram of a network-cascaded power receiving and communication system 100 according to an embodiment of the present invention. Figure 1 As shown, the network cascaded power receiving and communication system 100 of this embodiment includes a power supply device 110 and at least two cascaded power receiving devices 120 (first-level power receiving device 120, second-level power receiving device 120, ..., Nth-level power receiving device 120, where N≥2). The power supply device 110 is connected to the first-level power receiving device 120 via a network cable, the first-level power receiving device 120 is connected to the second-level power receiving device 120 via a network cable, and so on, with the (N-1)th-level power receiving device 120 connected to the Nth-level power receiving device 120 via a network cable.

[0062] In this embodiment, the power supply device 110 provides the power supply voltage; the powered device 120 receives the power supply voltage. Specifically, the power supply device 110 is, but is not limited to, a PSE (Power Sourcing Equipment) device, and the powered device 120 is, but is not limited to, a PD (Powered Device) device. Specifically, in this embodiment, the PSE device and the PD device are PSE devices and standard PD devices that are compatible with the IEEE 802.3AF / AT standard. The standard PSE device and the standard PD device have a series of handshake protocols, and the power supply voltage is provided in stages. When the PSE device and the PD device are connected through an Ethernet cable, the PD device provides a characteristic resistance to the PSE device, and then the PSE device provides a safe range detection voltage of 2.7V to 10.1V, performs at least two current measurements within 500ms, and the voltage difference between the two test points is at least 1V. When the characteristic resistance of the detected PD device is within a predetermined range, the PSE device performs power classification on the PD device and outputs the rated voltage.

[0063] The following describes in detail the structure and principle of the power supply device 110 and the cascaded power receiving device 120 in the network cascaded power receiving and communication system 100 of this embodiment, taking the power supply device 110 as a standard PSE device and the power receiving device 120 as a standard PD device.

[0064] In this embodiment, the power supply device 110 is a standard PD device with a POE protocol module; the power receiving device 120 is a standard PSE device with a POE protocol module; the POE protocol module is compatible with the IEEE 802.3AF / AT standard; the POE power supply module in the standard PSE device is used to supply power to the PSE device itself and the PD device.

[0065] Figure 2 The diagram shown is a schematic block diagram of the power supply device 110 in a network cascaded power receiving and communication system 100 according to an embodiment of the present invention. Figure 2 As shown, in this embodiment, the power supply device 110 includes: a main power supply circuit module 111, a power supply module 112, a power supply network transformer 113, and a power supply port 114; the main power supply circuit module 111 is a PSE device power supply main circuit module 111, and the power supply module 112 is a PoE power supply module 112. The main circuit module is connected to the power supply port 114 through the network transformer; the power supply module 112 is connected to the power supply network transformer 113 to supply power to the power supply port 114.

[0066] The power supply network transformer 113 includes multiple primary windings, and the two ends of each primary winding are respectively connected to the pins of the power supply network port 114; wherein, the middle taps of two of the primary windings are respectively connected to the positive and negative terminals of the power supply module 112, and the middle taps of the remaining primary windings are respectively connected to the same power polarity terminal of the power supply network port 114 and the power supply module 112.

[0067] This embodiment uses the power supply network transformer 113, which includes four primary windings, as an example for illustration. Figure 3 The diagram shown is a circuit schematic of the power supply device 110 in a network cascaded power receiving and communication system 100 according to an embodiment of the present invention. Figure 3 As shown, in this embodiment, the power supply network transformer 113 includes a first primary winding 113a, a second primary winding 113b, a third primary winding 113c, and a fourth primary winding 113d. The power supply port 114 has 8 pins, pins 1 to 8. A specific connection method for the network transformer, the power supply port 114, and the power supply module 112 is as follows:

[0068] like Figure 3 As shown, the two endpoints A and B of the first primary winding 113a are connected to pins 1 and 2 of the corresponding power supply port 114, respectively; the two endpoints C and D of the second primary winding 113b are connected to pins 3 and 6 of the corresponding power supply port 114, respectively; the two endpoints E and F of the third primary winding 113c are connected to pins 4 and 5 of the corresponding power supply port 114, respectively; the two endpoints G and H of the fourth primary winding 113d are connected to pins 7 and 8 of the corresponding port, respectively; the middle tap E+F of the third primary winding 113c is connected to the positive terminal of the power supply module 112; the middle tap G+H of the fourth primary winding 113d is connected to the positive terminal of the power supply module 112. The power supply port 114 is connected to the negative terminal of the power supply module 112. The middle taps of the first primary winding 113a and the second primary winding 113b of the power supply network transformer 113 are simultaneously connected to the same power supply polarity of the power supply module 112, that is, the positive terminal or the negative terminal of the power supply module 112. Alternatively, the middle taps of the first primary winding 113a and the middle taps of the second primary winding 113b of each power supply network transformer 113 are connected together, and the connection ends are connected to the same power supply polarity of the power supply module 112, that is, the positive terminal or the negative terminal of the power supply module 112.

[0069] In this embodiment, as Figure 1As shown, in at least two cascaded power receiving devices 120, the first-level power receiving device 120 is connected to the power supply device 110 and receives power from the power supply device 110; after the first-level power receiving device 120 receives power, it supplies power to the second-level power receiving device 120, and so on, until the Nth-level power receiving device 120 receives power from the previous-level power receiving device 120.

[0070] Each of the power receiving devices 120 that supplies power to the next level includes: a first network interface 121, a second network interface 122, and a relay 123. The first network interface 121 or the second network interface 122 supplies power to its respective power receiving device 120 after receiving power. The relay 123 is connected to both the first network interface 121 and the second network interface 122, and after being turned on, short-circuits the power supply pins of the first network interface 121 and the second network interface 122, thus supplying power to the next level power receiving device 120 through the first network interface 121 or the second network interface 122.

[0071] Figure 4 The diagram shown is a schematic block diagram of the powered device 120 in a network cascaded power receiving and communication system 100 according to an embodiment of the present invention. Figure 4 As shown, in this embodiment, the power receiving device 120 that supplies power to the next level includes a main power receiving circuit module 124, a power supply module 125, a first power receiving network transformer 126, and a second power receiving network transformer 127. The first network interface 121 and the second network interface 122 are respectively connected to the main power receiving circuit module 124 via the first power receiving network transformer 126 and the second power receiving network transformer 127. The relay 123 is connected to the main power receiving circuit module 124 and is controlled to conduct by the main power receiving circuit module 124, so that after conduction, the power supply pins of the first network interface 121 and the second network interface 122 are short-circuited.

[0072] Figure 5 The diagram shown is a circuit schematic of the powered device 120 in a network cascaded power receiving and communication system 100 according to an embodiment of the present invention. Figure 5 As shown, in this embodiment, the first power receiving network transformer 126 and the second power receiving network transformer 127 each include a plurality of primary windings. The two ends of each primary winding of the first power receiving network transformer 126 are respectively connected to the pins of the first power supply network port 114, and the two ends of each primary winding of the second power receiving network transformer 127 are respectively connected to the pins of the second power supply network port 114. The first network interface 121 or the second network interface 122 is connected to the power module 125.

[0073] Specifically, the first power receiving network transformer 126 includes a first primary winding 126a, a second primary winding 126b, a third primary winding 126c, and a fourth primary winding 126d; the second power receiving network transformer 127 includes a first primary winding 127a, a second primary winding 127b, a third primary winding 127c, and a fourth primary winding 127d.

[0074] A specific connection structure of the first network interface 121, the second network interface 122, the relay 123, the main power receiving circuit module 124, the power supply module 125, the first power receiving network transformer 126, and the second power receiving network transformer 127 is as follows:

[0075] The two endpoints A and B of the first primary winding 126a in the first power receiving network transformer 126 are connected to pins 1 and 2 of the first network interface 121, respectively; the two endpoints C and D of the second primary winding 126b are connected to pins 3 and 6 of the first network interface 121, respectively; the two endpoints E and F of the third primary winding 126c are connected to pins 4 and 5 of the first network interface 121, respectively; and the two endpoints G and H of the fourth primary winding 126d are connected to pins 7 and 8 of the first network interface 121, respectively.

[0076] The two endpoints A and B of the first primary winding 127a in the second power receiving network transformer 127 are respectively connected to pins 1 and 2 of the second network interface 122; the two endpoints C and D of the second primary winding 127b are respectively connected to pins 3 and 6 of the second network interface 122; the two endpoints E and F of the third primary winding 127c are respectively connected to pins 4 and 5 of the second network interface 122; and the two endpoints G and H of the fourth primary winding 127d are respectively connected to pins 7 and 8 of the second network interface 122.

[0077] The middle tap A+B of the first primary winding 126a corresponding to the first network interface 121 is connected to the positive terminal of the power module 125, and is also connected in parallel to pin 3 of the relay 123. The middle tap A+B of the first primary winding 127a corresponding to the second network interface 122 is connected to pin 4 of the relay 123. The middle tap E+F of the third primary winding 126c corresponding to the first network interface 121 is connected to the positive terminal of the power module 125, and is also connected in parallel to pin 6 of the relay 123. The middle tap E+F of the third primary winding 127c corresponding to the second network interface 122 is connected to pin 5 of the relay 123. The second primary winding 126a in the first power receiving network transformer 126... The intermediate taps C+D of the first primary winding 127b in the first power receiving network transformer 126 and the second primary winding 127b in the second power receiving network transformer 127 are both connected to the negative terminal of the PD power module 125; the intermediate taps G+H of the fourth primary winding 126d in the first power receiving network transformer 126 and the fourth primary winding 127d in the second power receiving network transformer 127 are both connected to the negative terminal of the PD power module 125; if power is needed for the next-level PD device, the relay 123 connects pins 3 and 4 and pins 5 and 6 respectively, that is, connects the positive terminals of the first network interface 121 and the second network interface 122 in the PD device to supply power to the next-level PD device. The main power receiving circuit module 124 intelligently controls the relay 123 to automatically engage, so the next-level PD device automatically obtains a power supply circuit through the shorted-together pins of the relay 123, forming a bus power supply mode, without affecting the communication of the twisted pair.

[0078] Figure 6 The diagram shown is a circuit schematic of a network cascaded power receiving and communication system 100 according to an embodiment of the present invention. Figure 6 As shown, the power module 125 in the power receiving device 120 is used to supply power to the power receiving device 120 itself, and its power comes from the POE power supply module in the PSE device that supplies power to it. At the same time, the power receiving device 120 supplies power to the next level power receiving device 120.

[0079] In this embodiment, when the main power receiving circuit module 124 detects that the voltage value of the power supply module 125 has reached a preset value, it controls the relay 123 to conduct after a preset delay, so as to supply power to the next-level power receiving device 120.

[0080] Specifically, in this embodiment, the PSE device initially outputs a very small voltage. Once it detects that the first-level PD device is a PD device supporting the IEEE 802.3AF or IEEE 802.3AT standard, the PSE device gradually increases the voltage to supply power to the first-level PD device from a low level until a stable and reliable DC voltage is provided to meet its power consumption. When the main power receiving circuit module 124 detects that the voltage value of the power supply module 125 has reached a preset value, it delays for a period of time before connecting the first-level and second-level PD devices, allowing the PSE device to simultaneously supply power to both, meeting their power consumption. After a further delay, it sequentially connects to the next-level PD device, providing a stable and reliable DC voltage. This embodiment utilizes relay 123 to sequentially open the power circuit of the next-level PD device, successfully passing the negotiation detection of the PD characteristic resistor. In contrast, in existing technologies, the characteristic resistors of all PD devices are connected in parallel, making negotiation of power reception impossible.

[0081] In this embodiment, the first network interface 121 and the second network interface 122 can be master-slave network interfaces, that is, one of them is the master network interface and the other is the slave network interface; the first network interface 121 and the second network interface 122 can also be non-master-slave, that is, either network interface can receive power and the other network interface supplies power to the next level power receiving device 120.

[0082] In this embodiment, as Figure 5 and Figure 6 As shown, the first network interface 121 serves as the main network interface, used to receive power from the power supply device 110 or the previous-level power receiving device 120, and is connected to the positive and negative terminals of the power module 125 respectively to supply power to the power module 125; the second network interface 122 serves as the slave network interface, connected to the negative terminal of the power module 125, and is used to connect the power supply pin of the positive terminal of the relay 123 with the power supply pin of the first network interface 121 when the relay 123 is turned on, to supply power to the next-level power receiving device 120.

[0083] When the first network interface 121 serves as the master network interface and the second network interface 122 serves as the slave network interface, the application process of the network cascaded power receiving and communication system 100 in this embodiment is as follows:

[0084] 1) Connect one network port of the standard PSE device to the main network interface of the first-level standard PD device via a network cable to provide the required voltage to the first-level standard PD device;

[0085] 2) According to the application requirements, connect the slave network interface of the first-level standard PD device to the master network interface of the second-level standard PD device through a network cable. After the PSE device provides a stable DC voltage to the first-level PD device, start the relay 123 after a time delay to connect the positive terminals of the master network interface and slave network interface of the first-level standard PD device, so as to provide the required voltage to the second-level standard PD device.

[0086] 3) Determine the number of network ports n in the second-level standard PD device. If n = 1, the cascading power receiving ends; if n ≥ 2, continue execution.

[0087] 4) According to the application requirements, connect the slave network interface of the second-level standard PD device to the master network interface of the third-level standard PD device through a network cable. After the PSE device provides a stable DC voltage to the second-level PD device, start the relay 123 after a time delay to connect the positive terminals of the master network interface and slave network interface of the second-level standard PD device, so as to provide the required voltage to the third-level standard PD device.

[0088] 5) Determine the number of network ports n in the third-level standard PD device. If n = 1, the cascading power receiving ends; if n ≥ 2, continue execution.

[0089] 6) Following this logic, the front-end standard PD device and the rear-end standard PD device are cascaded through the main network interface and the slave network interface to provide the required voltage to the rear-end standard PD device until the required voltage can no longer be provided to the rear-end standard PD device, at which point the cascading power supply ends.

[0090] In this embodiment, the first network interface 121 and the second network interface 122 can also be used without a master-slave distinction, which can solve the problem of cascading power supply application of dual network port powered devices 120.

[0091] In this embodiment, the connection diagram of the first network interface 121 and the second network interface 122 when there is no master-slave distinction is shown below. Figure 7 and Figure 8 As shown. Figure 7 This diagram illustrates a connection of two network interfaces of the powered device 120 in a network-cascaded power receiving and communication system 100 according to an embodiment of the present invention. Figure 7 As shown, in this embodiment, the ground pins of the first network interface 121 and the second network interface 122 are shorted and then connected in series with a diode, and then connected in parallel to the power module 125 of the power receiving module.

[0092] The hardware power supply implementation of the dual-network-port powered device 120 is to short-circuit the ground pins of the first network interface 121 and the second network interface 122. Specifically, as follows: Figure 7As shown, for the PSE device powered by pins 4, 5 and 7, 8 of the network interface, pins 4, 5 and 7, 8 of the first network interface 121 and the second network interface 122 are connected to the power supply device 110. Pins 4 and 5 of the first network interface 121 are shorted and connected in series with a diode D1 and then connected to a set of power input pins of the powered device 120. Pins 4 and 5 of the second network interface 122 are shorted and connected in series with a diode D2 and then connected to a set of power input pins of the powered device 120.

[0093] Figure 8 This diagram illustrates another connection of the two network interfaces of the powered device 120 in a network-cascaded power receiving and communication system 100 according to one embodiment of the present invention. Figure 8 As shown, in this embodiment, for the PSE device powered by pins 1, 2, 3, and 6 of the network port, the ground pins of the first network interface 121 and the second network interface 122 are shorted and then connected to a rectifier bridge, and then connected in parallel to the power module 125 of the power receiving module. That is, the ground pin of the first network interface 121 is shorted and connected to the rectifier bridge 121a, and the ground pin of the second network interface 122 is shorted and connected to the rectifier bridge 122a.

[0094] Figure 9 This diagram illustrates a rectifier in a network-cascaded power receiving and communication system 100 according to one embodiment of the present invention. Figure 9 As shown, in this embodiment, both rectifier bridges 121a and 122a are composed of four diodes bridged together, and have two input terminals: input terminal A and input terminal B. Taking the connection between the first network interface 121 and the rectifier bridge 121a as an example, the first and second pins of the first network interface 121 are shorted and then connected to one of the input terminals of the rectifier bridge 121a (e.g., ...). Figure 9 (A terminal of the first network interface 121) After shorting pins 3 and 6 of the first network interface 121, connect it to another input terminal of the rectifier bridge 121a (e.g., terminal A). Figure 9 Connect the B terminal of the rectifier bridge 121a to the power input pin of the power receiving device 120.

[0095] In this embodiment, the power supply pins of the first network interface 121 and the second network interface 122 are respectively connected to the relay 123. After the relay 123 is turned on, the power supply pins of the first network interface 121 and the second network interface 122 are short-circuited.

[0096] The power supply pins of the first network interface 121 and the second network interface 122 are respectively connected to one end of the relay 123 switch. When the relay 123 is turned on, the power supply pins of the first network interface 121 and the second network interface 122 are turned on (the default state is not turned on). Regardless of whether the PoE power supply cable is inserted from the first network interface 121 or the second network interface 122, the power supply can be connected to the local powered device 120 through the diode or rectifier bridge 121a and generate power to supply the local device. At the same time, since the diode has unidirectional conductivity, when the relay 123 is not turned on, the other network interface will not have power output.

[0097] In this embodiment, the relay 123 is not conducting in the initial state. At this time, regardless of whether the power supply cable is inserted from the first network interface 121 or the second network interface 122, the powered device 120 can generate power to supply the local device. When the power supply is normal, the local powered main circuit module 124 starts to work. After the powered main circuit module 124 starts working for a period of time (e.g., 30 seconds), it controls the relay 123 to work. After the relay 123 works, it will conduct the power supply pins of the first network interface 121 and the second network interface 122, thereby realizing the connection of power from one network port to another and supplying power to the next level powered device 120.

[0098] This embodiment also provides a method for network cascaded power receiving and communication, applied to the aforementioned system 100 comprising a power supply device 110 and at least two cascaded power receiving devices 120. The power receiving device 120 supplying power to the next level includes: a first network interface 121, a second network interface 122, and a relay 123.

[0099] In this embodiment, the method for network cascading power receiving and communication includes the following steps.

[0100] In step S100, the first-level power receiving device 120 obtains the power supply voltage from the power supply device 110 through the first network interface 121 or the second network interface 122;

[0101] Step S200: When the voltage of the first-level power receiving device 120 reaches a preset value, the relay 123 is turned on after a preset delay.

[0102] In step S300, after the relay 123 is turned on, the power supply pins of the first network interface 121 and the second network interface 122 are shorted, and the second-level power receiving device 120 is powered through the first network interface 121 or the second network interface 122.

[0103] In step S400, when the second-level power receiving device 120 needs to supply power to the next-level power receiving device 120, it has the same structure as the first-level power receiving device 120 and repeats the power supply control process of the first-level power receiving device 120.

[0104] Step S500 continues in this manner until the last-level power receiving device 120 is powered and no power supply is needed for the next-level power receiving device 120, at which point the power supply control ends.

[0105] The principle and implementation process of the network cascaded power receiving and communication method in this embodiment are the same as or similar to the principle and implementation process of the network cascaded power receiving and communication system 100. The same or similar technical features between the method and the system will not be repeated.

[0106] In summary, this invention uses a relay to short-circuit the power supply pins of the two network interfaces of the powered device, enabling the powered device to continue supplying power to the next level of powered device after receiving power. This effectively solves the technical problem of existing technologies that cannot provide cascaded power to powered devices. This invention is easy to install, saving cables and connectors, reducing costs and the size of communication equipment. Furthermore, this invention allows for negotiated power reception and bus-based power supply, avoiding the exponential attenuation of power efficiency caused by cascading power supplies. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial application value.

[0107] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A network-cascaded power receiving and communication system, characterized in that, include: A power supply device for providing power supply voltage, wherein the power supply device is a standard power supply device with an Ethernet power supply protocol module; At least two cascaded power receiving devices, wherein the first-level power receiving device is connected to the power supply device and receives power from the power supply device, and the power receiving device is a standard power receiving device with an Ethernet power supply protocol module; The power receiving equipment supplying power to the next level includes: a first network interface, a second network interface, a relay, a main power receiving circuit module, a power supply module, a first power receiving network transformer, and a second power receiving network transformer; wherein the first network interface and the second network interface are respectively connected to the main power receiving circuit module through the first power receiving network transformer and the second power receiving network transformer; the first power receiving network transformer and the second power receiving network transformer each include multiple primary windings, the two ends of each primary winding of the first power receiving network transformer are respectively connected to the pins of the first network interface, and the two ends of each primary winding of the second power receiving network transformer are respectively connected to the pins of the second network interface; The first network interface or the second network interface supplies power to the powered device it is connected to after receiving power; The relay is connected to the first network interface and the second network interface respectively, and after being turned on, it short-circuits the power supply pins of the first network interface and the second network interface to supply power to the next level power receiving device through the first network interface or the second network interface; the relay is used to sequentially open the power circuit of the next level power receiving device. The main power receiving circuit module is connected to the relay. When the main power receiving circuit module detects that the voltage value of the power supply module has reached a preset value, it controls the relay to turn on after a preset delay. The power module is connected to either the first network interface or the second network interface.

2. The network cascaded power receiving and communication system according to claim 1, characterized in that, The power supply equipment includes: a main power supply circuit module, a power supply module, a power supply network transformer, and a power supply network port; The main circuit module is connected to the power supply port through the network transformer; and is connected to the network transformer.

3. The network cascaded power receiving and communication system according to claim 2, characterized in that, The network transformer includes multiple primary windings, with both ends of each primary winding connected to the pins of the power supply port. Two of the primary windings are connected to the positive and negative terminals of the power supply module, respectively, and the remaining primary windings are connected to the same power polarity terminal of the power supply port and the power supply module.

4. The network cascaded power receiving and communication system according to claim 1, characterized in that, The first network interface serves as the main network interface, used to receive power from the power supply device or the previous-level power receiving device, and is connected to the positive and negative terminals of the power module respectively to supply power to the power module; the second network interface serves as the slave network interface, connected to the negative terminal of the power module, and is used to connect the power supply pin of the positive terminal with the power supply pin of the first network interface when the relay is turned on, to supply power to the next-level power receiving device.

5. The network cascaded power receiving and communication system according to claim 1, characterized in that, After the ground pins of the first network interface and the second network interface are shorted, a diode is connected in series with each of them, and then connected in parallel to the power supply module of the main circuit module.

6. The network cascaded power receiving and communication system according to claim 1, characterized in that, The ground pins of the first network interface and the second network interface are shorted and then connected to a rectifier bridge, and then connected in parallel to the power supply module of the main power receiving circuit module.

7. The network cascaded power receiving and communication system according to claim 5 or 6, characterized in that, The power supply pins of the first network interface and the second network interface are respectively connected to the relay. After the relay is turned on, the power supply pins of the first network interface and the second network interface are short-circuited.

8. A method for network cascaded power receiving and communication, applied to a network cascaded power receiving and communication system as described in any one of claims 1-7, characterized in that, The power supply equipment is a standard power supply equipment with an Ethernet Power Supply Protocol module, and the power receiving equipment is a standard power receiving equipment with an Ethernet Power Supply Protocol module. The power receiving equipment supplying power to the next level includes: a first network interface, a second network interface, a relay, a main power receiving circuit module, a power supply module, a first power receiving network transformer, and a second power receiving network transformer. The method includes: The first-level power receiving device obtains the power supply voltage from the power supply device through the first network interface or the second network interface; When the main circuit module detects that the voltage value of the power supply module has reached a preset value, it controls the relay to turn on after a preset delay. When the relay is turned on, it short-circuits the power supply pins of the first network interface and the second network interface, and supplies power to the second-level power receiving device through the first network interface or the second network interface. When the second-level power receiving device needs to supply power to the next-level power receiving device, it has the same structure as the first-level power receiving device and repeats the power supply control process of the first-level power receiving device. This process continues until the last level of power receiving equipment is energized, at which point there is no need to supply power to the next level of power receiving equipment, thus ending the power supply control.

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