CN116366382A - System and method for network cascade power receiving and communication - Google Patents

Abstract

The invention provides a system and a method for network cascade power receiving and communication, wherein the system comprises the following steps: a power supply device for providing a power supply voltage; the power receiving equipment of the first stage is connected with the power supply equipment and receives power from the power supply equipment; the powered apparatus that supplies power to the next stage includes: a first network interface, a second network interface, and a relay; the first network interface or the second network interface supplies power for the power receiving equipment where the first network interface or the second network interface is located after power is received; the relay is respectively connected with the first network interface and the second network interface, and after being conducted, the relay short-circuits the power supply pins of the first network interface and the second network interface, and the relay supplies power to the next-stage power receiving equipment through the first network interface or the second network interface. According to the invention, the power supply pins of the two network interfaces of the power receiving equipment are short-circuited through the relay, so that the function of continuously supplying power to the next-stage power receiving equipment after the power receiving equipment receives power is realized.

Description

System and method for network cascade power receiving and communication

Technical Field

The invention relates to the field of light control, in particular to a system and a method for network cascade power receiving and communication.

Background

POE is a technology for transmitting limited low voltage dc power over standard communication cables, collectively Power Over Ethernet, i.e. power is transmitted over a network cable simultaneously with ethernet data. POE system consists of PSE (Power Sourcing Equipment) and PD (Powered Device) linked by a network cable. PSE is a device for powering other devices, and PD is a device for receiving power in POE power supply system. In the working process of standard POE power supply, PSE equipment and PD equipment are standard POE equipment with a POE protocol module compatible with IEEE802.3AF/AT standard, namely standard PSE equipment and standard PD equipment; and POE devices without POE protocol modules are commonly referred to as non-standard POE devices, including non-standard PSE devices and non-standard PD devices.

Standard POE has a series of handshaking protocols, the supply voltage is provided in stages, the PD provides the PSE with a characteristic resistance when the PSE and PD are connected via an ethernet cable, then the PSE provides a safety range detection voltage of 2.7V-10.1V, current measurement is performed at least twice within 500ms, and the two test point voltages have a voltage difference of at least 1V, and when the detection characteristic resistance is within a predetermined range, the PSE performs power classification on the PD and outputs a rated voltage. The existing standard POE does not support cascade power supply of powered equipment, and limits the application of the POE.

Disclosure of Invention

In view of the above drawbacks of the prior art, an object of the present invention is to provide a system and a method for network cascade power reception and communication, which are used for solving the technical problem that the prior art cannot supply power to a power reception device cascade.

To achieve the above and other related objects, the present invention provides a system for network cascade power reception and communication, comprising: a power supply device for providing a power supply voltage; the power receiving equipment of the first stage is connected with the power supply equipment and receives power from the power supply equipment; wherein the power receiving apparatus that supplies power to the next stage includes: a first network interface, a second network interface, and a relay; the first network interface or the second network interface supplies power for the power receiving equipment where the first network interface or the second network interface is located after power is received; the relay is respectively connected with the first network interface and the second network interface, and after being conducted, the relay short-circuits the power supply pins of the first network interface and the second network interface, and the relay supplies power to the next-stage power receiving equipment through the first network interface or the second network interface.

In an embodiment of the present invention, the power supply apparatus includes: the power supply system comprises a power supply main circuit module, a power supply network transformer and a power supply network port; the main circuit module is connected with the power supply network port through the network transformer; is connected with the network transformer.

In an embodiment of the present invention, the network transformer includes a plurality of primary windings, and two ends of each primary winding are respectively connected to pins of the power supply network port; and the middle tap ends of the remaining primary windings are respectively connected with the power supply network port and the same power supply polarity end of the power supply module.

In an embodiment of the present invention, the powered device for supplying power to the next stage includes a power receiving main 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 with the power receiving main 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 respectively comprise a plurality of primary windings, two ends of each primary winding of the first power receiving network transformer are respectively and correspondingly connected with pins of the first power supply network port, and two ends of each primary winding of the second power receiving network transformer are respectively and correspondingly connected with pins of the second power supply network port; the relay is connected with the power-receiving main circuit module, and is controlled to be conducted through the power-receiving main circuit module so as to short-circuit power supply pins of the first network interface and the second network interface after being conducted.

In an embodiment of the present invention, the first network interface is used as a master network interface, and is used for receiving power from a power supply device or the power receiving device at a previous stage, and is respectively connected to the positive terminal and the negative terminal of the power supply module, so as to supply power to the power supply module; the second network interface is used as a slave network interface and is connected with the negative electrode end of the power supply module, and is used for conducting a power supply pin at the positive electrode end of the relay and a power supply pin at the positive electrode end of the first network interface when the relay is conducted so as to supply power to the next-stage power receiving equipment.

In an embodiment of the present invention, after the grounding pins of the first network interface and the second network interface are shorted, a diode is respectively connected in series, and then the power module of the power receiving module is connected in parallel.

In an embodiment of the present invention, the grounding pins of the first network interface and the second network interface are respectively connected with a rectifier bridge after being shorted, and then are connected in parallel to the power module of the power receiving module.

In an embodiment of the present invention, 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 shorted.

In an embodiment of the invention, when the power receiving main circuit module detects that the voltage value of the power supply module reaches a preset value, the relay is controlled to be turned on after a preset time is delayed so as to supply power to the next-stage power receiving equipment.

To achieve the above and other related objects, the present invention further provides a method for network cascade power receiving and communication, which is applied to a system including one power supply device and at least two power receiving devices in cascade, wherein the power receiving device for supplying power to the next stage includes: a first network interface, a second network interface, and a relay; the method comprises the following steps: the first-stage power receiving device obtains a power supply voltage from the power supply device through a first network interface or the second network interface; when the voltage of the first-stage power receiving equipment reaches a preset value, the relay is controlled to be conducted after a preset time is delayed; shorting the power supply pins of the first network interface and the second network interface after the relay is conducted, and supplying power to second-stage power receiving equipment through the first network interface or the second network interface; when the second-stage power receiving device needs to supply power to the next-stage power receiving device, the second-stage power receiving device has the same structure as the first-stage power receiving device, and the power supply control process of the first-stage power receiving device is repeated; and the same is repeated until the last-stage power receiving equipment receives power, and power supply control is finished without supplying power to the next-stage power receiving equipment.

As described above, the system and method for network cascade power receiving and communication of the present invention have the following advantages:

(1) According to the invention, the power supply pins of the two network interfaces of the power receiving equipment are in short circuit through the relay, so that the function of continuously supplying power to the next-stage power receiving equipment after the power receiving equipment receives power is realized, and the technical problem that the cascade power supply of the power receiving equipment cannot be realized in the prior art is effectively solved.

(2) The invention has convenient installation, can save cables and sockets and reduce the cost and the volume of communication equipment.

(3) The invention can negotiate the power supply, and supply power through the bus, and has no disadvantage of cascading exponential decay of power efficiency.

Drawings

Fig. 1 is a schematic block diagram of a network cascade power-on and communication system according to an embodiment of the invention.

Fig. 2 is a schematic block diagram of a power supply device in a network cascade power-up and communication system according to an embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of a power supply device in a network cascade power receiving and communication system according to an embodiment of the present invention.

Fig. 4 is a schematic block diagram of a powered device in a system for network cascaded power reception and communication according to an embodiment of the present invention.

Fig. 5 is a schematic circuit diagram of a powered device in a network cascade power receiving and communication system according to an embodiment of the present invention.

Fig. 6 is a schematic circuit diagram of a system for network cascade power-on and communication according to an embodiment of the invention.

Fig. 7 is a schematic diagram showing a connection between two network interfaces of a powered device in a network cascade power receiving and communicating system according to an embodiment of the present invention.

Fig. 8 is a schematic diagram illustrating another connection between two network interfaces of a powered device in a network cascade power receiving and communicating system according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of a rectifier in a network cascade power-on and communication system according to an embodiment of the invention.

Description of element reference numerals

100. Network cascade power receiving and communication system

110. Power supply apparatus

111. Power supply main circuit module

112. Power supply module

113. Power supply network transformer

113a first primary winding

113b second primary winding

113c third primary winding

113d fourth primary winding

114. Power supply network port

120. Power receiving apparatus

121. First network interface

121a rectifier bridge

122. Second network interface

122a rectifier bridge

123. Relay device

124. Power receiving main circuit module

125. Power supply module

126. First power receiving network transformer

126a first primary winding

126b second primary winding

126c third primary winding

126d fourth primary winding

127. Second receiving network transformer

127a first primary winding

127b second primary winding

127c third primary winding

127d fourth primary winding

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

The embodiment provides a system and a method for network cascade power receiving and communication, which realize standardized cascade power receiving and communication, support a cascade mode of 1 in and out, control common mode points of different devices through a relay to be respectively short-circuited together to form a bus power supply mode, do not influence communication of twisted pairs, utilize the relay to sequentially open a power loop of next-stage power receiving device, and can smoothly pass through negotiation detection of characteristic resistance of the power receiving device.

The principles and embodiments of the system and method for network cascade power and communications of the present invention will be described in detail below to enable those skilled in the art to understand the concepts of the present invention without undue burden.

Fig. 1 shows a schematic block diagram of a system 100 for network cascade power-up and communication in an embodiment of the invention. As shown in fig. 1, the network cascade power receiving and communicating system 100 of the present embodiment includes a power supply device 110 and at least two power receiving devices 120 (a first-stage power receiving device 120, a second-stage power receiving device 120, … …, and an nth-stage power receiving device 120, where N is greater than or equal to 2) in cascade. The power supply device 110 is connected to the first-stage power receiving device 120 through a network cable, the first-stage power receiving device 120 is connected to the second-stage power receiving device 120 through a network cable, and the nth-1-stage power receiving device 120 is connected to the nth-stage power receiving device 120 through a network cable.

In this embodiment, the power supply device 110 is configured to provide a power supply voltage; the powered device 120 receives a supply voltage. Specifically, the power supply apparatus 110 is, but is not limited to, a PSE (Power Sourcing Equipment) apparatus, and the power receiving apparatus 120 is, but is not limited to, a PD (Powered Device) apparatus. Specifically, in the present embodiment, the PSE device and the PD device are PSE devices and standard PD devices having ieee802.3af/AT standards compatible. The standard PSE device and the standard PD device have a series of handshaking protocols, the supply voltage is provided in stages, the PD device provides a characteristic resistance to the PSE device when the PSE device and the PD device are connected through an ethernet cable, then the PSE device provides a safety range detection voltage of 2.7V-10.1V, current measurement is performed at least twice within 500ms, and the two test point voltages have a voltage difference of at least 1V, and when the characteristic resistance of the PD device is detected within a predetermined range, the PSE device performs power classification on the PD device and outputs a rated voltage.

The structure and principle of the power supply device 110 and the cascaded power receiving device 120 in the system 100 for network cascade power reception and communication according to the embodiment will be described in detail below by taking the power supply device 110 as a standard PSE device and the power receiving device 120 as a standard PD device, respectively.

In this embodiment, the power supply device 110 is a standard PD device with a POE protocol module; the powered device 120 is a standard PSE device with POE protocol module; the POE protocol module is compatible with IEEE802.3AF/AT standard; and the POE power supply module in the standard PSE device is used for supplying power to the PSE device and the PD device.

Fig. 2 shows a schematic block diagram of a power supply device 110 in a system 100 for network cascade power-up and communication in an embodiment of the invention. As shown in fig. 2, in the present embodiment, the power supply apparatus 110 includes: a power supply main circuit module 111, a power supply module 112, a power supply network transformer 113, and a power supply network port 114; the power supply main circuit module 111 is a power supply main circuit module 111 of PSE equipment, and the power supply module 112 is a POE power supply module 112. The main circuit module is connected with the power supply network port 114 through the network transformer; the power supply module 112 is connected with the power supply network transformer 113 to supply power to the power supply network port 114.

Wherein the power supply network transformer 113 includes a plurality of primary windings, and two ends of each primary winding are respectively connected to pins of the power supply network port 114; wherein, the middle tap ends of two of the primary windings are respectively connected to the positive and negative ends of the power supply module 112, and the remaining middle tap ends of the primary windings are respectively connected to the power supply network port 114 and the same power polarity end of the power supply module 112.

In this embodiment, the power supply network transformer 113 includes four primary windings as an example. Fig. 3 is a schematic circuit diagram of a power supply device 110 in a network cascade power-up and communication system 100 according to an embodiment of the invention. As shown in fig. 3, in the present 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, pin 1 to pin 8. The network transformer, the power supply network port 114 and the power supply module 112 are specifically connected in the following manner:

as shown in fig. 3, two end points A, B of the first primary winding 113a are respectively connected to the 1 st pin and the 2 nd pin corresponding to the power supply network port 114; two end points C, D of the second primary winding 113b are respectively connected with pins 3 and 6 of the corresponding power supply network port 114; two end points E, F of the third primary winding 113c are respectively connected with the 4 th pin and the 5 th pin of the corresponding power supply network port 114; two end points G, H of the fourth primary winding 113d are respectively connected with the 7 th pin and the 8 th pin of the corresponding network ports; the middle tap end E+F of the third primary winding 113c is connected with the positive electrode end of the power supply module 112; the middle tap end g+h of the fourth primary winding 113d is connected to the negative end of the power supply module 112; the middle tap end of the first primary winding 113a and the middle tap end of the second primary winding 113b of the power supply network transformer 113, which are respectively connected to the power supply network ports 114, are simultaneously connected to the same power polarity of the power supply module 112, that is, the positive end of the power supply module 112 or the negative end of the power supply module 112, or the middle tap end of the first primary winding 113a and the middle tap end 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 polarity of the power supply module 112, that is, the positive end of the power supply module 112 or the negative end of the power supply module 112.

In this embodiment, as shown in fig. 1, of at least two cascaded power receiving apparatuses 120, a first power receiving apparatus 120 is connected to the power supply apparatus 110, and receives power from the power supply apparatus 110; the first-stage power receiving apparatus 120 supplies power to the second-stage power receiving apparatus 120 after power is received, and so on until the nth-stage power receiving apparatus 120 receives power from the previous-stage power receiving apparatus 120.

Wherein, each powered device 120 for supplying power to the next stage 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 the powered device 120 where the first network interface or the second network interface 122 is located after power is received; the relay 123 is connected to 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, and supplies power to the next-stage power receiving device 120 through the first network interface 121 or the second network interface 122.

Fig. 4 shows a functional block diagram of a powered device 120 in a system 100 for network cascaded power reception and communication in an embodiment of the present invention. As shown in fig. 4, in the present embodiment, the powered device 120 for supplying power to the next stage includes a power receiving main circuit module 124, a power source module 125, a first power receiving network transformer 126, and a second power receiving network transformer 127; wherein the first network interface 121 and the second network interface 122 are connected to the power receiving main circuit module 124 through the first power receiving network transformer 126 and the second power receiving network transformer 127, respectively; the relay 123 is connected to the power receiving main circuit module 124, and is controlled to be turned on by the power receiving main circuit module 124, so as to short the power supply pins of the first network interface 121 and the second network interface 122 after being turned on.

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

Specifically, the first 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.

The specific connection structure of the first network interface 121, the second network interface 122, the relay 123, the power receiving main 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:

two end points A, B of the first primary winding 126a in the first power receiving network transformer 126 are respectively connected with the 1 st pin and the 2 nd pin of the first network interface 121, and two end points C, D of the second primary winding 126b are respectively connected with the 3 rd pin and the 6 th pin of the first network interface 121; two end points E, F of the third primary winding 126c are respectively connected with the 4 th pin and the 5 th pin of the first network interface 121; two end points G, H of the fourth primary winding 126d are respectively connected to the 7 th pin and the 8 th pin of the first network interface 121.

Two end points A, B of the first primary winding 127a in the second power receiving network transformer 127 are respectively connected with the 1 st pin and the 2 nd pin of the second network interface 122, and two end points C, D of the second primary winding 127b are respectively connected with the 3 rd pin and the 6 th pin of the second network interface 122; two end points E, F of the third primary winding 127c are respectively connected with pins 4 and 5 of the second network interface 122; two end points G, H of the fourth primary winding 127d are respectively connected to pins 7 and 8 of the second network interface 122.

The intermediate tap end a+b of the first primary winding 126a corresponding to the first network interface 121 is connected to the positive end of the power module 125, and is simultaneously connected to the pin 3 of the relay 123 in parallel, and the intermediate tap end a+b of the first primary winding 127a corresponding to the second network interface 122 is connected to the pin 4 of the relay 123; the intermediate tap end e+f of the third primary winding 126c corresponding to the first network interface 121 is connected to the positive electrode end of the power module 125, and is simultaneously connected to the pin 6 of the relay 123 in parallel, and the intermediate tap end e+f of the third primary winding 127c corresponding to the second network interface 122 is connected to the pin 5 of the relay 123; the intermediate tap end c+d of the second primary winding 126b in the first power receiving network transformer 126 and the intermediate tap end c+d of the second primary winding 127b in the second power receiving network transformer 127 are both connected to the negative terminal of the PD power supply module 125; the intermediate tap end g+h of the fourth primary winding 126d in the first power receiving network transformer 126 and the intermediate tap end g+h of the fourth primary winding 127d in the second power receiving network transformer 127 are both connected to the negative terminal of the PD power supply module 125; if power needs to be supplied to the next-stage PD device, the relay 123 is respectively connected to pins 3 and 4 and pins 5 and 6, that is, the positive poles of the first network interface 121 and the second network interface 122 in the PD device are connected to each other, so that power is supplied to the next-stage PD device. The power receiving main circuit module 124 intelligently controls the relay 123 to automatically attract, so that the next stage PD equipment automatically obtains a power supply loop through the pins of the relay 123 which are short-circuited together, a bus power supply mode is formed, and the communication of twisted pairs is not affected.

Fig. 6 is a schematic circuit diagram of a system 100 for network cascade power and communications according to an embodiment of the invention. As shown in fig. 6, the power module 125 in the powered device 120 is configured to power itself to the powered device 120 where it is located, where the power is from a POE power module in the PSE device that powers it, and the powered device 120 powers the next powered device 120.

In this embodiment, when the power receiving main circuit module 124 detects that the voltage value of the power supply module 125 reaches a preset value, the relay 123 is controlled to be turned on after a delay for a preset time, so as to supply power to the next-stage power receiving device 120.

Specifically, in this embodiment, the PSE device outputs a small voltage first until it detects that the first-stage PD device is a PD device supporting the IEEE802.3AF standard or IEEE802.3AT standard, and the PSE device starts to supply power to the first-stage PD device from low-voltage gradual boosting until it provides a stable and reliable dc voltage for the first-stage PD device, so as to meet power consumption of the first-stage PD device; when the power receiving main circuit module 124 detects that the voltage value of the power supply module 125 reaches a preset value, the first-stage PD equipment and the second-stage PD equipment are communicated after timing delay for a period of time, so that PSE equipment supplies power to the first-stage PD equipment and the second-stage PD equipment simultaneously, and the power consumption is met; and after a period of time delay, the timing device is sequentially communicated with the next-stage PD equipment, and stable and reliable direct-current voltage is provided for the next-stage PD equipment. In this embodiment, the relay 123 is used to sequentially open the power circuit of the next stage PD device, so that the negotiation detection of the PD characteristic resistance can be successfully performed. In the prior art, the characteristic resistances of all the PD devices are combined together, so that the power reception cannot be negotiated.

In this embodiment, the first network interface 121 and the second network interface 122 may be master-slave network interfaces, that is, one of them is a master network interface and the other is a slave network interface; the first network interface 121 and the second network interface 122 may be independent of each other, that is, either one of the network interfaces may receive power, and the other network interface may supply power to the next-stage power receiving device 120.

In this embodiment, as shown in fig. 5 and fig. 6, the first network interface 121 is used as a master network interface, and is used to receive power from the power supply device 110 or the power receiving device 120 at the previous stage, and is respectively connected to the positive terminal and the negative terminal of the power supply module 125, so as to supply power to the power supply module 125; the second network interface 122 is connected to the negative terminal of the power module 125 as a slave network interface, and is used for conducting the power supply pin at the positive terminal to the power supply pin at the positive terminal of the first network interface 121 when the relay 123 is conducted, so as to supply power to the next-stage power receiving device 120.

When the first network interface 121 is used as a master network interface and the second network interface 122 is used as a slave network interface, the application procedure of the system 100 for power and communication in network cascade of this embodiment is as follows:

1) Connecting one network port of the standard PSE equipment with a main network interface of the first-stage standard PD equipment through a network cable to provide the first-stage standard PD equipment with the required voltage;

2) According to application requirements, a slave network interface of the first-stage standard PD equipment is connected with a master network interface of the second-stage standard PD equipment through a network cable, after PSE equipment provides stable direct current voltage for the first-stage PD equipment, a relay 123 is started after timing delay for a period of time, the anodes of the master network interface and the slave network interface of the first-stage standard PD equipment are communicated, and the required voltage is provided for the second-stage standard PD equipment;

3) Determining the number n of network ports in the second-stage standard PD equipment, and ending the cascade power reception if n=1; if n is more than or equal to 2, continuing to execute;

4) According to application requirements, a slave network interface of the second-stage standard PD equipment is connected with a master network interface of the third-stage standard PD equipment through a network cable, after PSE equipment provides stable direct-current voltage for the second-stage PD equipment, a relay 123 is started after timing delay for a period of time, the anodes of the master network interface and the slave network interface of the second-stage standard PD equipment are communicated, and the required voltage is provided for the third-stage standard PD equipment;

5) Determining the number n of network ports in the third-level standard PD equipment, and ending the cascade power reception if n=1; if n is more than or equal to 2, continuing to execute;

6) And step by step, the front-stage standard PD equipment and the rear-stage standard PD equipment are cascaded through the master network interface and the slave network interface, the required voltage is provided for the rear-stage standard PD equipment, and the cascade power receiving is finished until the required voltage can not be provided for the rear-stage standard PD equipment.

In this embodiment, the first network interface 121 and the second network interface 122 may be independent of each other, so as to solve the problem of cascade power supply application of the dual-port powered device 120.

In this embodiment, the connection diagrams of the first network interface 121 and the second network interface 122 without dividing the master-slave mode are shown in fig. 7 and 8. Fig. 7 is a schematic diagram illustrating a connection between two network interfaces of a powered device 120 in a network cascade power-on and communication system 100 according to an embodiment of the invention. As shown in fig. 7, in the present embodiment, after the grounding pins of the first network interface 121 and the second network interface 122 are shorted, a diode is connected in series respectively, and then the power module 125 of the power receiving module is connected in parallel.

Namely, the hardware power supply implementation manner of the dual-network-port power receiving device 120 is to short-circuit the grounding pins of the first network interface 121 and the second network interface 122, specifically, as shown in fig. 7, corresponding to PSE devices powered by the 4 th, 5 th, 7 th and 8 th pins of the network interface 121 and the second network interface 122 are respectively connected with the power supply device 110 by using the 4 th, 5 th, 7 th and 8 th pins of the first network interface 121 and the second network interface 122, after the 4 th and 5 th pins of the first network interface 121 are short-circuited, one diode D1 is connected in series and then connected to a set of power input pins of the power receiving device 120, and after the 4 th and 5 th pins of the second network interface 122 are short-circuited, one diode D2 is connected in series and then connected to a set of power input pins of the power receiving device 120.

Fig. 8 is a schematic diagram illustrating another connection between two network interfaces of a powered device 120 in a network cascade power-on and communication system 100 according to an embodiment of the invention. As shown in fig. 8, in this embodiment, corresponding to PSE devices powered by pins 1, 2, 3, and 6 of the network port, the grounding pins of the first network port 121 and the second network port 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. Namely, the first network interface 121 is connected to the rectifier bridge 121a after being short-circuited with the ground pin, and the second network interface 122 is connected to the rectifier bridge 122a after being short-circuited with the ground pin.

Fig. 9 is a schematic diagram of a rectifier in a system 100 for network cascade power and communication according to an embodiment of the invention. As shown in fig. 9, in this embodiment, each of the rectifier bridge 121a and the rectifier bridge 122a is formed by four diode bridges, and has two input terminals: input a and input B. Taking the connection between the first network interface 121 and the rectifier bridge 121a as an example, the 1 st and 2 nd pins of the first network interface 121 are shorted to connect to one of the input ends of the rectifier bridge 121a (e.g., the a end in fig. 9), the 3 rd and 6 th pins of the first network interface 121 are shorted to connect to the other input end of the rectifier bridge 121a (e.g., the B end in fig. 9), and then the output end of the rectifier bridge 121a is connected to the power input pin of the powered device 120.

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, and 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.

I.e. the supply pins of the first network interface 121 and the second network interface 122 are connected to one of the ends of the switch of the relay 123, respectively, the supply pins of the first network interface 121 and the second network interface 122 are conductive (the default state is non-conductive) when the relay 123 is conductive. Whether the POE powered network line is plugged in from the first network interface 121 or the second network interface 122, the power supply may access the local powered device 120 through a diode or rectifier bridge 121a and generate a power supply to power the local device; meanwhile, since the diode has unidirectional conductivity, the other network interface does not have an electrical output when the relay 123 is not conductive.

In this embodiment, the relay 123 is not turned on in the initial state, and no matter whether the network cable for power supply is plugged in from the first network interface 121 or plugged in from the second network interface 122, the powered device 120 can generate a power source to supply power to the local device, and the local power receiving main circuit module 124 starts to work when the power supply is normal; the main power receiving circuit module 124 controls the relay 123 to operate after a period of time (e.g. 30S) starts to operate, and the relay 123 will conduct the power supply pins of the first network interface 121 and the second network interface 122 after operating, so as to realize that power is communicated from one network port to another network port and power is supplied to the next-stage power receiving device 120.

The present embodiment also provides a method for network cascade power receiving and communication, which is applied to the system 100 for network cascade power receiving and communication including one power supply device 110 and at least two power receiving devices 120 in cascade. Wherein the power receiving apparatus 120 for supplying power to the next stage includes: a first network interface 121, a second network interface 122, and a relay 123.

In this embodiment, the method for network cascade power receiving and communication includes: the following steps.

Step S100, the first-stage power receiving apparatus 120 acquires a power supply voltage from the power supply apparatus 110 through the first network interface 121 or the second network interface 122;

step S200, when the voltage of the first-stage power receiving apparatus 120 reaches a preset value, delaying the preset time and then controlling the relay 123 to be turned on;

step S300, after the relay 123 is turned on, shorting the power supply pins of the first network interface 121 and the second network interface 122, and supplying power to the second-stage power receiving device 120 through the first network interface 121 or the second network interface 122;

step S400, when the second-stage power receiving apparatus 120 needs to supply power to the next-stage power receiving apparatus 120, of the same structure as the first-stage power receiving apparatus 120, and repeating the power supply control process of the first-stage power receiving apparatus 120;

step S500, and so on, until the last-stage power receiving device 120 receives power, and power supply control is finished without supplying power to the next-stage power receiving device 120.

The principle and implementation process of the network cascade power receiving and communicating method in this embodiment are the same as or similar to those of the network cascade power receiving and communicating system 100, and the same or similar technical features between the method and the system are not described in detail.

In summary, the power supply pins of two network interfaces of the power receiving equipment are short-circuited through the relay, so that the function that the power receiving equipment continuously supplies power to the next-stage power receiving equipment after being powered on is realized, and the technical problem that the cascade power supply of the power receiving equipment cannot be realized in the prior art is effectively solved; the invention has convenient installation, can save cables and sockets, and reduces the cost and the volume of communication equipment; the invention can negotiate the power supply, and supply power through the bus, and has no disadvantage of cascading exponential decay of power efficiency. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. A system for network cascading power and communications, comprising:

a power supply device for providing a power supply voltage;

the power receiving equipment of the first stage is connected with the power supply equipment and receives power from the power supply equipment;

wherein the power receiving apparatus that supplies power to the next stage includes: a first network interface, a second network interface, and a relay; the first network interface or the second network interface supplies power for the power receiving equipment where the first network interface or the second network interface is located after power is received; the relay is respectively connected with the first network interface and the second network interface, and after being conducted, the relay short-circuits the power supply pins of the first network interface and the second network interface, and the relay supplies power to the next-stage power receiving equipment through the first network interface or the second network interface.

2. The system for network cascade power and communication according to claim 1, wherein the power supply device comprises: the power supply system comprises a power supply main circuit module, a power supply network transformer and a power supply network port;

the main circuit module is connected with the power supply network port through the network transformer; is connected with the network transformer.

3. The system for network cascade power and communication according to claim 2, wherein the network transformer comprises a plurality of primary windings, and two ends of each primary winding are respectively connected with pins of the power supply network port; and the middle tap ends of the remaining primary windings are respectively connected with the power supply network port and the same power supply polarity end of the power supply module.

4. The system for network cascade power receiving and communicating according to claim 1, wherein the power receiving device for supplying power to the next stage comprises a power receiving main 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 with the power receiving main 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 respectively comprise a plurality of primary windings, two ends of each primary winding of the first power receiving network transformer are respectively and correspondingly connected with pins of the first power supply network port, and two ends of each primary winding of the second power receiving network transformer are respectively and correspondingly connected with pins of the second power supply network port; the relay is connected with the power-receiving main circuit module, and is controlled to be conducted through the power-receiving main circuit module so as to short-circuit power supply pins of the first network interface and the second network interface after being conducted.

5. The system according to claim 4, wherein the first network interface is used as a master network interface for receiving power from a power supply device or the power receiving device at a previous stage, and is respectively connected to the positive terminal and the negative terminal of the power supply module, so as to supply power to the power supply module; the second network interface is used as a slave network interface and is connected with the negative electrode end of the power supply module, and is used for conducting a power supply pin at the positive electrode end of the relay and a power supply pin at the positive electrode end of the first network interface when the relay is conducted so as to supply power to the next-stage power receiving equipment.

6. The system of claim 4, wherein the first network interface and the second network interface are connected in series with a diode after being shorted to the ground pin, and then connected in parallel to the power module of the power receiving module.

7. The system of claim 4, wherein the grounding pins of the first network interface and the second network interface are respectively connected with a rectifier bridge after being shorted, and then are connected in parallel to the power module of the power receiving module.

8. The system of claim 6 or 7, wherein the power supply pins of the first network interface and the second network interface are respectively connected with the relay, and the power supply pins of the first network interface and the second network interface are shorted after the relay is turned on.

9. The system according to claim 5, 6 or 7, wherein the power receiving main circuit module controls the relay to be turned on after a delay of a preset time to supply power to the next stage of power receiving equipment when detecting that the voltage value of the power supply module reaches a preset value.

10. A network cascade power receiving and communicating method is applied to a system comprising a power supply device and at least two power receiving devices in cascade, wherein the power receiving device for supplying power to the next stage comprises the following components: a first network interface, a second network interface, and a relay; characterized in that the method comprises:

the first-stage power receiving device obtains a power supply voltage from the power supply device through a first network interface or the second network interface;

when the voltage of the first-stage power receiving equipment reaches a preset value, the relay is controlled to be conducted after a preset time is delayed;

shorting the power supply pins of the first network interface and the second network interface after the relay is conducted, and supplying power to second-stage power receiving equipment through the first network interface or the second network interface;

when the second-stage power receiving device needs to supply power to the next-stage power receiving device, the second-stage power receiving device has the same structure as the first-stage power receiving device, and the power supply control process of the first-stage power receiving device is repeated;

and the same is repeated until the last-stage power receiving equipment receives power, and power supply control is finished without supplying power to the next-stage power receiving equipment.

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