阅读说明：本技术 以太网供电系统中受电连接检测方法及供电装置 (Power receiving connection detection method and power supply device in Ethernet power supply system ) 是由 吴建兴 朱欣荣 于 2021-08-24 设计创作，主要内容包括：本申请公开了一种以太网供电系统中受电连接检测方法,包括：在第一供电端口和第二供电端口分别提供第一电流信号和第二电流信号以向受电设备供电,并获取第二供电端口出的多个端口电压组成第一数组；在第一供电端口和第二供电端口分别提供第三电流信号和第二电流信号,并获取第二供电端口处的多个端口电压组成第二数组,第二数组中数据的个数与第一数组中数据的个数相同；根据第一数组和第二数组判断第一供电端口和第二供电端口同时向同一个受电设备供电还是第一供电端口和第二供电端口分别向各自独立连接的受电设备供电。本申请还提供一种供电装置,不论是对于大阻容签名的传统受电设备还是标准受电设备均可以实现正确的连接检测。(The application discloses a method for detecting power receiving connection in an Ethernet power supply system, which comprises the following steps: providing a first current signal and a second current signal at a first power supply port and a second power supply port respectively to supply power to the powered device, and acquiring a plurality of port voltages output by the second power supply port to form a first array; respectively providing a third current signal and a second current signal at the first power supply port and the second power supply port, and acquiring a plurality of port voltages at the second power supply port to form a second array, wherein the number of data in the second array is the same as that of the data in the first array; and judging whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to the powered devices which are respectively and independently connected according to the first array and the second array. The application also provides a power supply device, which can realize correct connection detection for both the traditional powered equipment with the large resistance-capacitance signature and the standard powered equipment.)

1. A method for detecting a powered connection in a power over ethernet system, wherein the power over ethernet system includes a first power port and a second power port, the method comprising:

providing a first current signal and a second current signal at a first power supply port and a second power supply port respectively to supply power to the powered device, and acquiring a plurality of port voltages output by the second power supply port to form a first array;

respectively providing a third current signal and a second current signal at a first power supply port and a second power supply port, and acquiring a plurality of port voltages at the second power supply port to form a second array, wherein the number of data in the second array is the same as that of the data in the first array;

and judging whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to the powered devices which are respectively and independently connected according to the first array and the second array.

2. The powered connection detection method of claim 1, wherein providing the first current signal and the second current signal at the first power supply port and the second power supply port, respectively, to supply power to the powered device, and obtaining a plurality of port voltages from the second power supply port to form a first array comprises:

providing a first current signal at the first power port and a second current signal at the second power port for a first predetermined period of time to power the powered device;

in a first preset time period, acquiring a port voltage at a second power supply port at preset intervals to obtain a first array, wherein the first array comprises a plurality of first voltages.

3. The powered connection detection method of claim 2, wherein providing the third current signal and the second current signal at the first power port and the second power port, respectively, and obtaining a plurality of port voltages at the second power port into a second number group comprises:

providing a third current signal at the first power supply port for a second predetermined time period, the second current signal at the second power supply port remaining unchanged;

and in a second preset time period, acquiring port voltage at a second power supply port at preset intervals to obtain a second array, wherein the second array comprises a plurality of second voltages, and the number of data in the second array is the same as that of data in the first array.

4. The power receiving connection detection method according to claim 3, further comprising:

judging whether the port voltage at the second power supply port is in a stable state after a first preset time period according to the plurality of first voltages;

when the port voltage at the second power supply port is in a stable state after a first preset time period, judging whether each second voltage is greater than the first voltage;

and when the second voltage in the second array is greater than the first voltage in the first array, determining that the first power supply port and the second power supply port simultaneously supply power to the same powered device.

5. The power receiving connection detection method according to claim 4, further comprising:

and when the second voltage in the second array is the same as the first voltage in the first array, determining that the first power supply port and the second power supply port respectively supply power to the independently connected powered device.

6. The power receiving connection detection method according to claim 4, further comprising:

when the port voltage at the second power supply port is not in a stable state after a first preset time period, judging whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to the respective independently connected powered devices according to the initial slope of the second array and the terminal slope of the first array;

wherein, the initial slope is the slope between the two foremost voltage values in the array; the terminal slope is the slope between the last two voltage values in the array.

7. The power receiving connection detection method according to claim 6, further comprising:

and when the initial slope of the second array is greater than the terminal slope of the first array, determining that the first power supply port and the second power supply port simultaneously supply power to the same powered device.

8. The powered connection detection method of claim 6, wherein the first power port and the second power port are determined to respectively supply power to the independently connected powered device when the initial slope of the second array is not greater than the terminal slope of the first array.

9. The power receiving connection detecting method according to claim 1, wherein the third current signal is larger than the first current signal by at least a predetermined amount.

10. A power supply apparatus in a power over ethernet system, comprising:

a first power supply port for supplying power to a powered device;

a second power supply port for supplying power to the powered device;

the first detection power supply is connected with the first power supply port and used for providing a first current signal or a third current signal for the first power supply port;

the second detection power supply is connected with the second power supply port and used for providing a second current signal to the first power supply port; and

the control unit is connected with the first detection power supply, the second detection power supply, the first power supply port and the second power supply port;

the control unit is used for controlling the first detection power supply to provide a first current signal at the first power supply port, and simultaneously controlling the second detection power supply to provide a second current signal at the second power supply port so as to supply power to the powered device, and acquiring a plurality of port voltages output by the second power supply port to form a first array;

the control unit is used for controlling the first detection power supply to provide a third current signal at the first power supply port, simultaneously controlling the second detection power supply to provide a second current signal at the second power supply port, and acquiring a plurality of port voltages at the second power supply port to form a second array, wherein the number of data in the second array is the same as the number of data in the first array;

the control unit is further configured to determine, according to the first array and the second array, whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to respective independently connected powered devices.

11. The power supply device according to claim 10, wherein the control unit is further configured to control the first detecting power supply to provide the first current signal at the first power supply port and simultaneously control the second detecting power supply to provide the second current signal at the second power supply port during the first predetermined period of time;

the control unit is further configured to obtain, in a first predetermined time period, a port voltage at the second power supply port every preset time to obtain a first array, where the first array includes a plurality of first voltages.

12. The power supply device of claim 11, wherein the control unit is further configured to control the first detecting power supply to provide the third current signal at the first power supply port and the second detecting power supply to maintain the second current signal at the second power supply port for a second predetermined period of time;

the control unit is further configured to obtain, in a second predetermined time period, a port voltage at the second power supply port at every preset time to obtain a second array, where the second array includes a plurality of second voltages.

13. The power supply device according to claim 12, wherein the control unit further determines whether the port voltage at the second power supply port is in a stable state after a first preset time period according to the plurality of first voltages;

the control unit is also used for judging whether each second voltage is greater than the first voltage or not when the port voltage at the second power supply port is in a stable state after a first preset time period;

the control unit further determines that the first power supply port and the second power supply port simultaneously supply power to the same powered device when the second voltage in the second array is greater than the first voltage in the first array.

14. The power supply apparatus according to claim 13, wherein the control unit further determines that the first power supply port and the second power supply port respectively supply power to the independently connected power receiving devices when the second voltage in the second array is the same as the first voltage in the first array.

15. The apparatus according to claim 13, wherein the control unit further determines, when the port voltage at the second power supply port is not in a stable state after the first preset time period, whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to the independently connected powered devices according to an initial slope of the second array and a terminal slope of the first array.

16. The power supply apparatus of claim 15, wherein the control unit further determines that the first power port and the second power port simultaneously supply power to the same powered device when the initial slope of the second array is greater than the terminal slope of the first array.

17. The power supply apparatus according to claim 15, wherein when the initial slope of the second array is not greater than the terminal slope of the first array, it is determined that the first power port and the second power port respectively supply power to the independently connected powered devices.

18. The power supply of claim 10, wherein the third current signal is greater than the first current signal by at least a predetermined amount.

Technical Field

The present invention relates to power over ethernet technology, and more particularly, to a power receiving connection detection method and a power supply apparatus for use in a power over ethernet system.

Background

The Power Over Ethernet (POE) technology is a technology for providing dc Power to a terminal device in a network through a network cable based on the existing Ethernet wiring infrastructure. In the power over ethernet technology, the network cable has both functions of transmitting data signals and supplying power with dc. The technology ensures that the terminal equipment does not need to depend on an external power adapter for power supply, thereby saving a power adapter, a power supply cable and a plug and saving wiring and hardware cost.

According to the IEEE 802.3 protocol, a Power Over Ethernet (POE) supports both that two Power supply ports of a Power Sourcing Equipment (PSE) are connected together to realize high-Power supply to a Single powered device (Single-signature PD), and that the two Power supply ports respectively supply Power to two separate powered devices (Dual-signature PDs).

However, the prior art does not provide a method for determining whether two power supply apparatuses are connected together at the power receiving end to supply power to one power receiving apparatus with high power or whether the two power supply apparatuses independently supply power to different power receiving apparatuses at the power receiving end.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a power receiving connection detection method and a power feeding apparatus in a power over ethernet system, which change a current signal of another power feeding port while keeping a current signal of one power feeding port unchanged, and determine whether to feed power to each independently connected power receiving device or simultaneously feed power to one power receiving device by two power feeding ports according to a plurality of port voltages of the power feeding port where the power feeding signal is unchanged.

According to an aspect of the present invention, a method for detecting a powered connection in a power over ethernet system is provided, where the power over ethernet system includes a first power sourcing port and a second power sourcing port, and the method for detecting a powered connection includes: providing a first current signal and a second current signal at a first power supply port and a second power supply port respectively to supply power to the powered device, and acquiring a plurality of port voltages output by the second power supply port to form a first array; respectively providing a third current signal and a second current signal at a first power supply port and a second power supply port, and acquiring a plurality of port voltages at the second power supply port to form a second array, wherein the number of data in the second array is the same as that of the data in the first array; and judging whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to the powered devices which are respectively and independently connected according to the first array and the second array.

Preferably, providing the first current signal and the second current signal at the first power supply port and the second power supply port respectively to supply power to the powered device, and obtaining a plurality of port voltages output by the second power supply port to form a first array includes: providing a first current signal at the first power port and a second current signal at the second power port for a first predetermined period of time to power the powered device; in a first preset time period, acquiring a port voltage at a second power supply port at preset intervals to obtain a first array, wherein the first array comprises a plurality of first voltages.

Preferably, providing the third current signal and the second current signal at the first power supply port and the second power supply port, respectively, and obtaining a plurality of port voltages at the second power supply port to form a second number group includes: providing a third current signal at the first power supply port for a second predetermined time period, the second current signal at the second power supply port remaining unchanged; and acquiring the port voltage at a second power supply port at preset intervals in a second preset time period to obtain a second array, wherein the second array comprises a plurality of second voltages.

Preferably, the power receiving connection detection method further includes: judging whether the port voltage at the second power supply port is in a stable state after a first preset time period according to the plurality of first voltages; when the port voltage at the second power supply port is in a stable state after a first preset time period, judging whether each second voltage is greater than the first voltage; and when the second voltage in the second array is greater than the first voltage in the first array, determining that the first power supply port and the second power supply port simultaneously supply power to the same powered device.

Preferably, the power receiving connection detection method further includes: and when the second voltage in the second array is the same as the first voltage in the first array, determining that the first power supply port and the second power supply port respectively supply power to the independently connected powered device.

Preferably, the power receiving connection detection method further includes: when the port voltage at the second power supply port is not in a stable state after a first preset time period, judging whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to the respective independently connected powered devices according to the initial slope of the second array and the terminal slope of the first array; wherein, the initial slope is the slope between the two foremost voltage values in the array; the terminal slope is the slope between the last two voltage values in the array.

Preferably, the power receiving connection detection method further includes: and when the initial slope of the second array is greater than the terminal slope of the first array, determining that the first power supply port and the second power supply port simultaneously supply power to the same powered device.

Preferably, when the initial slope of the second array is not greater than the terminal slope of the first array, it is determined that the first power supply port and the second power supply port respectively supply power to the independently connected powered device.

Preferably, the third current signal is greater than the first current signal by at least a predetermined amount.

According to another aspect of the present invention, there is provided a power supply apparatus in a power over ethernet system, comprising: a first power supply port for supplying power to a powered device; a second power supply port for supplying power to the powered device; the first detection power supply is connected with the first power supply port and used for providing a first current signal or a third current signal for the first power supply port; the second detection power supply is connected with the second power supply port and used for providing a second current signal to the first power supply port; the control unit is connected with the first detection power supply, the second detection power supply, the first power supply port and the second power supply port; the control unit is used for controlling the first detection power supply to provide a first current signal at the first power supply port, and simultaneously controlling the second detection power supply to provide a second current signal at the second power supply port so as to supply power to the powered device, and acquiring a plurality of port voltages output by the second power supply port to form a first array; the control unit is used for controlling the first detection power supply to provide a third current signal at the first power supply port, simultaneously controlling the second detection power supply to provide a second current signal at the second power supply port, and acquiring a plurality of port voltages at the second power supply port to form a second array, wherein the number of data in the second array is the same as the number of data in the first array; the control unit is further configured to determine, according to the first array and the second array, whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to respective independently connected powered devices.

Preferably, the control unit is further configured to control the first detection power supply to provide the first current signal at the first power supply port and simultaneously control the second detection power supply to provide the second current signal at the second power supply port within a first predetermined time period; the control unit is further configured to obtain, in a first predetermined time period, a port voltage at the second power supply port every preset time to obtain a first array, where the first array includes a plurality of first voltages.

Preferably, the control unit is further configured to control the first detection power supply to provide the third current signal at the first power supply port and control the second detection power supply to maintain the second current signal at the second power supply port unchanged during the second predetermined time period; the control unit is further configured to obtain, in a second predetermined time period, a port voltage at the second power supply port at every preset time to obtain a second array, where the second array includes a plurality of second voltages.

Preferably, the control unit further determines, according to the plurality of first voltages, whether a port voltage at the second power supply port is in a stable state after a first preset time period; the control unit is also used for judging whether each second voltage is greater than the first voltage or not when the port voltage at the second power supply port is in a stable state after a first preset time period; the control unit further determines that the first power supply port and the second power supply port simultaneously supply power to the same powered device when the second voltage in the second array is greater than the first voltage in the first array.

Preferably, the control unit further determines that the first power supply port and the second power supply port respectively supply power to the independently connected powered devices when the second voltage in the second array is the same as the first voltage in the first array.

Preferably, when the port voltage at the second power supply port is not in a stable state after the first preset time period, the control unit further determines, according to the initial slope of the second array and the terminal slope of the first array, whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to the powered devices which are independently connected to each other.

Preferably, the control unit further determines that the first power supply port and the second power supply port simultaneously supply power to the same powered device when the initial slope of the second array is greater than the terminal slope of the first array.

Preferably, when the initial slope of the second array is not greater than the terminal slope of the first array, it is determined that the first power supply port and the second power supply port respectively supply power to the independently connected powered device.

Preferably, the third current signal is greater than the first current signal by at least a predetermined amount.

According to the power receiving connection detection method and the power supply device in the power over ethernet system of the embodiment of the present invention, the same power supply is provided at each of the two power supply ports, that is, the current source is provided at each of the two power supply ports, the current signal with different amplitude is provided to one of the power supply ports in different time periods, the current signal of the other power supply port remains unchanged, and it is determined whether the two power supply ports respectively supply power to independent power receiving equipment or simultaneously supply power to one power receiving equipment according to the first array and the second array formed by obtaining the voltages of the plurality of ports in different time periods.

Further, whether the port voltage of the power supply port reaches a stable state within a first preset time period is judged according to the plurality of first voltages in the first array, and when the port voltage of the power supply port can reach the stable state within the first preset time period, it can be determined whether the two power supply ports respectively supply power to independent powered devices or simultaneously supply power to one powered device according to the magnitude relation between the second voltage and the first voltage.

Further, when the port voltage of the power supply port cannot reach a steady state within a first preset time period, it may be determined whether the two power supply ports respectively supply power to independent powered devices or simultaneously supply power to one powered device according to the terminal slope of the first array and the initial slope of the second array. Correct connection detection can be achieved for both legacy powered devices with large rc signatures and standard powered devices.

The circuit structure of the embodiment of the invention is simple, the detection method is simple, the cost is low, the loss is small, only one constant current source is needed, and the voltage of a plurality of ports of two different time periods is obtained, so that whether the two power supply ports respectively supply power to the respective independently connected powered equipment or simultaneously supply power to one powered equipment can be determined.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 shows a schematic circuit diagram of a POE power supply system in the prior art;

fig. 2 shows a schematic circuit diagram of another POE power supply system in the prior art;

fig. 3 shows a schematic circuit diagram of a power supply device according to an embodiment of the invention;

fig. 4 shows a flow chart of a power receiving connection detection method according to an embodiment of the invention;

fig. 5 shows a flowchart of step S401 in the power receiving connection detecting method according to the embodiment of the present invention;

fig. 6 shows a flowchart of step S402 in the power receiving connection detection method according to the embodiment of the present invention;

fig. 7 shows a flowchart of step S403 in the power receiving connection detection method according to the embodiment of the present invention;

fig. 8 to 12 show waveform diagrams of a supply signal and a port voltage signal according to an embodiment of the present invention.

Detailed Description

Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.

Fig. 1 shows a schematic circuit diagram of a POE power supply system 100 provided in the prior art. As shown in fig. 1, the POE power supply system 100 includes a power supply device 10, a powered device 20, and an interface unit 30 connecting between the power supply device 10 and the powered device 20.

The power supply device 10 includes a first power supply port 11, a second power supply port 12, and a power supply control circuit 13.

The powered device 20 comprises a first power receiving port 21, a second power receiving port 22 and a powered device PD, wherein the powered device PD comprises a first power receiving control circuit 23 and a load 24.

In the present embodiment, the first power receiving port 21 has a first bridge configuration, and the second power receiving port 22 has a second bridge configuration.

The interface unit 30 includes a plurality of transformers (T1-T4) connected to power supply ports each connected to a pair of transformers, and a plurality of transformers (T5-T8) connected to power receiving ports each connected to a pair of transformers, and a plurality of pairs of power supply lines; the first power supply port 11 is connected with a first transformer T1 and a second transformer T2 respectively, and the second power supply port 12 is connected with a third transformer T3 and a fourth transformer T4 respectively; the first power receiving port 21 is connected to the fifth transformer T5 and the sixth transformer T6, respectively, and the second power receiving port 22 is connected to the seventh transformer T7 and the eighth transformer T8, respectively.

The secondary windings of the transformers connected to the supply ports are connected to the first ends of respective pairs of supply lines, which are typically listed in two groups: the first group of supply lines comprises two pairs of supply lines, namely a first pair of supply lines (P1, P2) and a second pair of supply lines (P3, P4); the second set of supply lines comprises two pairs of supply lines, namely a third pair of supply lines (P5, P6) and a fourth pair of supply lines (P7, P8), enabling power and signals to be transmitted on the first and second sets of conductors. Specifically, the secondary winding of the first transformer T1 is connected to the first power supply line pair (P1, P2), and the secondary winding of the second transformer T2 is connected to the second power supply line pair (P3, P4); the secondary winding of the third transformer T3 is connected to the third power supply line pair (P5, P6), and the secondary winding of the fourth transformer T4 is connected to the fourth power supply line pair (P7, P8).

A first output terminal of the first supply port 11 is connected to a center tap of a secondary winding of a transformer connected to the first supply line pair, and a second output terminal of the first supply port 11 is connected to a center tap of a secondary winding of a transformer connected to the second supply line pair. That is, the first power supply port 11 is connected between the center tap of the secondary winding of the first transformer T1 and the center tap of the secondary winding of the second transformer T2. A first output of the second supply port 12 is connected to a center tap of the secondary winding of the transformer connected to the third supply line pair and a second output of the second supply port 12 is connected to a center tap of the secondary winding of the transformer connected to the fourth supply line pair. That is, the second power supply port 12 is connected between the center tap of the secondary winding of the third transformer T3 and the center tap of the secondary winding of the fourth transformer T4. The first power supply port 11 supplies power to the powered device 20 through the first group of wires (i.e., the first power supply wire pair and the second power supply wire pair); the second power supply port 12 supplies power to the power receiving device 20 through the second group of wires (i.e., the third power supply wire pair and the fourth power supply wire pair).

The primary winding of the transformer connected to the power receiving port is connected to the second end of the corresponding power supply line pair, i.e. the primary winding of the fifth transformer T5 is connected to the first power supply line pair (P1, P2); the primary winding of the sixth transformer T6 is connected to the second power supply line pair (P3, P4); the primary winding of the seventh transformer T7 is connected to the third power supply line pair (P5, P6); the primary winding of the eighth transformer T8 is connected to the fourth power supply line pair (P7, P8).

A first input of the first power receiving port 21 is connected to a center tap of the primary winding of the transformer connected to the first power supply line pair, and a second input of the first power receiving port 21 is connected to a center tap of the primary winding of the transformer connected to the second power supply line pair. That is, the first input terminal and the second input terminal of the first power receiving port 21 are connected to the center tap of the primary winding of the fifth transformer T5 and the center tap of the primary winding of the sixth transformer T6, respectively.

A first input of the second power receiving port 22 is connected to the center tap of the primary winding of the transformer connected to the third power supply line pair and a second input of the second power receiving port 22 is connected to the center tap of the primary winding of the transformer connected to the fourth power supply line pair. That is, the first input terminal and the second input terminal of the second power receiving port 22 are connected to the center tap of the primary winding of the seventh transformer T7 and the center tap of the primary winding of the eighth transformer T8, respectively.

The positive output terminals of the first and second power receiving ports 21, 22 are commonly connected to the positive input terminal of the first power receiving control circuit 23, and the negative output terminals of the first and second power receiving ports 21, 22 are commonly connected to the negative input terminal of the first power receiving control circuit 23. The first power receiving control circuit 23 has a path from the positive input terminal to its positive output terminal and has a path from the negative input terminal to its negative output terminal. A positive input of the load 24 is connected to a positive output of the first control circuit 23. That is, the outputs of the first power receiving port 21 and the second power receiving port 22 are simultaneously connected to the same powered device, so that the first power supply port 11 and the second power supply port 12 supply power to one powered device. The power supply apparatus 10 supplies power to one power receiving device through two power supply ports and two power receiving ports connected together. Fig. 2 shows a schematic circuit diagram of another POE power supply system 200 in the prior art. The POE power supply system 200 is identical to the POE power supply system 100 in all respects, except that the interface unit 30 is connected to two independent powered devices 20a and 20b, respectively.

In the present embodiment, the power receiving device 20a is, for example, a camera, and the power receiving device 20b is, for example, a telephone conference machine, but the invention is not limited thereto.

The powered device 20a comprises a first powered port 21 and a first powered device PD1, wherein the first powered device PD1 comprises a first powered control circuit 23 and a load 24. The powered device 20b comprises a second powered port 22 and a second powered device PD2, wherein the second powered device PD2 comprises a second powered control circuit 25 and supplies power to the load 26.

The first power supply port 11 individually supplies power to the first power receiving apparatus PD1 through the two power supply line pairs and the first power receiving port 21; the second power supply port 12 supplies power to the second powered device PD2 through two power supply line pairs and the second power receiving port 22. That is, the first power receiving port 21 and the second power receiving port 22 are connected to respective power receiving devices, so that the first power supply port 11 and the second power supply port 12 supply power to the respective independently connected power receiving devices. The power supply apparatus 10 supplies power to the independent power receiving devices through the two power supply ports and the two power receiving ports.

The POE power supply systems 100 and 200 each provide power to the powered device PD over four power supply line pairs, and although a method for determining whether two power supply ports of the power supply apparatus supply power to the same powered device or supply power to respective independent powered devices is provided in the prior art, the method in the prior art is complicated.

Fig. 3 shows a schematic block diagram of a power supply apparatus provided by an embodiment of the present invention. As shown in fig. 3, the power supply device 300 includes a first power supply port 11, a second power supply port 12, and a control unit 310, a first detection power source 320 and a second detection power source 330.

In this embodiment, the first detection power source 320 and the second detection power source are both current sources.

The control unit 310 may be provided in the power supply control circuit 13, or the control unit 310 may be connected to the power supply control circuit 13 and executed according to a control command of the power supply control circuit 13.

The first detection power source 320 is connected to the first power supply port 11, and the second detection power source 330 is connected to the second power supply port 12. The first and second supply ports 11, 12 each comprise two outputs, each connected to a secondary winding of a respective transformer for connection to the powered device 20 through a respective set of power supply lines. In particular, as described above with respect to POE power supply systems 100, 200, each transformer is connected to a respective one of four pairs of power supply lines; a pair of transformers is connected to the two pairs of supply lines. Two output ends of the first power supply port 11 are respectively connected with the first pair of transformers, that is, two output ends of the first power supply port 11 are respectively connected with the first transformer T1 and the second transformer T2; two output terminals of the second power supply port 12 are respectively connected to the second pair of transformers, that is, two output terminals of the second power supply port 12 are respectively connected to the third transformer T3 and the fourth transformer T4.

Fig. 4 shows a flow chart of a power receiving connection detection method according to an embodiment of the invention. As shown in fig. 4, the power receiving connection detection method includes the following steps.

In step S401, a first current signal and a second current signal are respectively provided at a first power supply port and a second power supply port to supply power to a powered device, and a plurality of port voltages output by the second power supply port are obtained to form a first array.

Specifically, referring to fig. 5, step S401 includes the following steps.

In step S4011, a first current signal is provided at the first power supply port and a second current signal is provided at the second power supply port for a first predetermined period of time to supply power to the powered device.

The first current signal is provided by the first detection power source 320, and the first current signal is a voltage signal with an amplitude Ia 1. The second current signal is provided by the second detection power supply 330, and the second current signal is a current signal with an amplitude of Ib.

In step S4012, a port voltage at the second power supply port is obtained at preset time intervals within a first predetermined time period to obtain a first array, where the first array V1[ n ] includes a plurality of first voltages.

In this embodiment, the first predetermined time period is an integral multiple of the preset time; the number n of the first arrays is at least 2, and in this embodiment, n is 10 as an example, but the present invention is not limited thereto.

In step S402, a third current signal and a second current signal are respectively provided at the first power supply port and the second power supply port, and a plurality of port voltages at the second power supply port are obtained to form a second array, where the number of data in the second array is the same as the number of data in the first array.

Specifically, referring to fig. 6, step S402 includes the following steps.

In step S4021, a third current signal is provided at the first power supply port and a second current signal provided at the second power supply port remains unchanged for a second predetermined period of time.

In this embodiment, the second current signal at the second power supply port remains unchanged, and the first current signal at the first power supply port is changed to a third current signal, which is of the same type and different amplitude from the first current signal. The amplitude of the third current signal is Ia 2. The third current signal is greater than the first current signal by at least a predetermined amount, e.g., 2Ia1 at Ia 2.

In step S4022, in a second predetermined time period, acquiring a port voltage at a second power supply port at preset intervals to obtain a second array, where the second array includes a plurality of second voltages, and the number of data in the second array is the same as the number of data in the first array.

In this embodiment, the first predetermined time period is an integral multiple of the preset time; the number of the second arrays V2[ n ] is the same as the number of the first arrays V1[ n ].

In step S403, it is determined whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to the independently connected powered devices according to the first array and the second array.

In this embodiment, step S403 specifically includes the following steps.

Referring to fig. 7, in step S4031, it is determined whether the port voltage at the second power supply port is in a stable state after a first preset time period according to the plurality of first voltages.

When the port voltage at the second power supply port is in a stable state after a first preset time period, executing step S4032; when the port voltage at the second power supply port is not in a stable state after the first preset time period, step S4033 is performed.

In step S4032, it is determined whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to respective independently connected powered devices according to the second voltages in the second array and the first voltages in the first array.

In this embodiment, when the second voltage in the second array is greater than the first voltage in the first array, it is determined that the first power supply port and the second power supply port simultaneously supply power to the same powered device, and otherwise, it is determined that the first power supply port and the second power supply port respectively supply power to the powered devices that are independently connected to each other.

In step S4033, it is determined whether the first power port and the second power port simultaneously supply power to the same powered device or the first power port and the second power port respectively supply power to respective independently connected powered devices according to the initial slope of the second array and the terminal slope of the first array.

In this embodiment, a corresponding slope may be obtained between two adjacent first voltages, and a slope between the two foremost voltage values in each array is taken as an initial slope of the array, and a slope between the two rearmost voltage values is taken as a terminal slope of the array. The terminal slope of the first array is compared to the initial slope of the second array.

And when the initial slope of the second array is greater than the terminal slope of the first array, determining that the first power supply port and the second power supply port simultaneously supply power to the same powered device. And when the initial slope of the second array is not greater than the terminal slope of the first array, determining that the first power supply port and the second power supply port respectively supply power to the power receiving equipment which is independently connected with each other.

Fig. 8 to 12 are waveform diagrams of each power supply signal and port voltage signal according to an embodiment of the present invention, and a power receiving connection detection method according to the embodiment will be described below with reference to the drawings.

Specifically, whether the port voltage at the second power supply port is in a stable state after a first preset time period is judged according to the plurality of first voltages.

When the port voltage at the second power supply port is in a stable state after a first preset time period (see fig. 9 and 10), it is determined whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to the independently connected powered devices according to the magnitudes of the plurality of second voltages in the second array and the plurality of first voltages in the first array.

Referring to fig. 9, when the second voltage in the second array is greater than the first voltage in the first array, it is determined that the first power supply port and the second power supply port simultaneously supply power to the same powered device.

Referring to fig. 10, when the second voltage in the second array is the same as the first voltage in the first array, it is determined that the first power supply port and the second power supply port respectively supply power to the independently connected powered devices.

When the port voltage at the second power supply port is not in a stable state after a first preset time period (see fig. 11 and 12), it is determined, according to the initial slope of the second array and the terminal slope of the first array, whether the first power supply port and the second power supply port simultaneously supply power to the same powered device or the first power supply port and the second power supply port respectively supply power to the powered devices which are independently connected to each other.

Referring to fig. 11, when the initial slope of the second array is greater than the terminal slope of the first array, it is determined that the first power port and the second power port simultaneously supply power to the same powered device.

Referring to fig. 12, when the initial slope of the second array is smaller than the terminal slope of the first array, it is determined that the first power supply port and the second power supply port respectively supply power to the independently connected powered devices.

According to the power receiving connection detection method and the power supply device in the power over ethernet system of the embodiment of the present invention,

the method comprises the steps that the same power supplies are respectively provided at two power supply ports, namely, current sources are respectively provided at the two power supply ports, voltage and current signals with different amplitudes are provided for one of the power supply ports in different time periods, the current signal of the other power supply port is kept unchanged, and the fact that the two power supply ports respectively supply power to independent power receiving equipment or simultaneously supply power to one power receiving equipment is determined according to a first array and a second array formed by acquiring voltages of a plurality of ports in different time periods.

Further, whether the port voltage of the power supply port reaches a stable state within a first preset time period is judged according to the plurality of first voltages in the first array, and when the port voltage of the power supply port can reach the stable state within the first preset time period, it can be determined whether the two power supply ports respectively supply power to independent powered devices or simultaneously supply power to one powered device according to the magnitude relation between the second voltage and the first voltage.

Further, when the port voltage of the power supply port cannot reach a steady state within a first preset time period, it may be determined whether the two power supply ports respectively supply power to independent powered devices or simultaneously supply power to one powered device according to the terminal slope of the first array and the initial slope of the second array. Correct connection detection can be achieved for both legacy powered devices with large rc signatures and standard powered devices.

The circuit structure of the embodiment of the invention is simple, the detection method is simple, the cost is low, the loss is small, only one constant current source is needed, and the voltage of a plurality of ports of two different time periods is obtained, so that whether the two power supply ports respectively supply power to the respective independently connected powered equipment or simultaneously supply power to one powered equipment can be determined.

While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.