Power supply equipment and power over ethernet system

Abstract

The utility model discloses power supply equipment and a power over Ethernet system. The power supply equipment comprises a power supply port used for being connected with an external input voltage; a plurality of power supply ports, wherein each power supply port is used for being connected with a corresponding power receiving device through the interface unit; the plurality of switch elements are in one-to-one correspondence with the plurality of power supply ports, the first end of each switch element is connected with the power supply port, and the second end of each switch element is connected with the corresponding power supply port; and the power supply controller is connected with the control ends of the plurality of switch elements and is used for controlling the conduction of the plurality of switch elements so as to supply power to the power receiving equipment connected with the corresponding power supply ports. Compared with a traditional scheme, the power supply equipment provided by the utility model can omit an isolation circuit arranged among a plurality of pieces of power receiving equipment at the power receiving end under the condition of ensuring normal detection grading, so that the complexity and the cost of a system can be reduced, additional power consumption and energy loss are not introduced, and the efficiency of the system is improved.

Description

Technical Field

[0001] The utility model relates to the field of electronic technology, and more specifically, to a power supply device and an Ethernet power supply system. Background Art

[0002] Power over Ethernet (PoE), also known as PoE, is a technology that can transmit power and data to devices through twisted pair cables in Ethernet. This technology is compatible with existing Ethernet wiring infrastructure and allows devices to be powered through their network ports, thus eliminating the need for power cables and saving wiring and hardware costs. Ethernet power technology has been widely used in video phones, security, IoT devices and other fields.

[0003] The Ethernet power supply system generally includes a power sourcing equipment (PSE), a powered device (PD), and an Ethernet cable for transmitting power and data between the two.

[0004] Traditional PoE technology can only provide power to a single terminal device, which has certain limitations in some scenarios. For example, in a large enterprise network, it may be necessary to power multiple terminal devices at the same time, such as IP phones, security cameras, wireless access points, etc. In addition, some high-power devices (such as high-performance wireless access points, TV walls, etc.) may require a larger power supply.

[0005] To meet these needs, the IEEE802.3BT standard introduced Multi-Port Power over Ethernet (MPPoE) technology. MPPoE technology allows PoE power supply equipment (PSE) to provide power to multiple powered devices (PD) at the same time. By using MPPoE technology, network equipment can provide power to multiple terminal devices more flexibly, thereby simplifying network wiring and management. However, in actual application, because the BT standard link enables the PSE device to supply power to multiple downstream powered devices at the same time, when one channel is in the power supply state, the power supply current of the power supply channel will flow through the common ground between multiple powered devices to the detection ports of the remaining channels, resulting in detection failure.

[0006] Therefore, the Ethernet power supply system of the prior art usually adds an isolation circuit between multiple powered devices to prevent the power supply current of the power supply state path from flowing to the detection port of the detection classification state path. However, adding the isolation circuit will increase the complexity and cost of the system, and will also introduce certain power consumption and energy loss, reducing the efficiency of the system. Utility Model Content

[0007] In view of this, an object of the present invention is to provide a power supply device and an Ethernet power supply system, which can omit the isolation circuit between multiple powered devices arranged at the power receiving end while ensuring normal detection and classification.

[0008] According to one aspect of the utility model, a power supply device is provided, comprising: N power supply modules, N is an integer greater than or equal to 1, and the N power supply modules are connected one-to-one with corresponding transformer groups and corresponding powered devices; each of the power supply modules is connected to the corresponding transformer group through a corresponding power supply port; the power supply module is connected between the power port and the corresponding power supply port, receives an input voltage via the power port, and supplies power to the corresponding powered device via the corresponding power supply port and the corresponding transformer group.

[0009] Optionally, the power supply module includes: a driving circuit, the output end of the driving circuit is connected to the control end of the switching element to output a driving signal, and the input end of the driving circuit is connected to the corresponding power supply port to input a detection signal; a switching element, the first end of the switching element is connected to the power port, the second end of the switching element is connected to the corresponding power supply port, and the control end of the switching element receives the driving signal.

[0010] Optionally, the driving circuit includes a driving unit and a detection unit, the detection unit is used to receive the detection signal, and identify the power classification of the powered device when a qualified powered device is connected to the corresponding power supply port; when the corresponding power supply port is connected to a qualified powered device and the power classification meets the requirements, the driving unit outputs the driving signal to control the switching element to turn on, and when the powered device connected to the corresponding power supply port does not meet the conditions or the power classification does not meet the requirements, the driving unit controls the switching element to turn off.

[0011] Optionally, when the switch element is turned on, the power supply current flows through the corresponding power supply port, the corresponding transformer group and the corresponding powered device to the ground terminal.

[0012] Optionally, the driving circuit and the switch element in the power supply module are integrated in the same first chip.

[0013] Optionally, the driving circuit in the power supply module is integrated in the second chip, and the switch element of the power supply module is a device independent of the second chip.

[0014] Optionally, the power supply module includes: a driving circuit, wherein the output end of the driving circuit is connected to the control end of the switching element to output a driving signal, and the input end of the driving circuit is connected to the corresponding power supply port to input a detection signal; a first switching element, wherein the first end of the first switching element is connected to the power port, the second end of the first switching element is connected to the corresponding power supply port, and the control end of the first switching element receives the driving signal; and a second switching element, wherein the first end of the second switching element is connected to the power port, the second end of the second switching element is connected to the corresponding power supply port, and the control end of the second switching element receives the driving signal, wherein the driving circuit and the first switching element are integrated in a third chip, and the second switching element is a device independent of the third chip.

[0015] Optionally, the switch element is a P-type field effect transistor or an N-type field effect transistor.

[0016] Optionally, the switch element is a P-type bipolar transistor or an N-type bipolar transistor.

[0017] According to another aspect of the utility model, an Ethernet power supply system is provided, comprising: N power supply modules, N transformer groups and N powered devices, wherein N is an integer greater than or equal to 1, and the N power supply modules are connected one-to-one with the corresponding transformer groups and the corresponding powered devices; each of the power supply modules is connected to the corresponding transformer group through a corresponding power supply port; the power supply module is connected between the power port and the corresponding power supply port, receives an input voltage via the power port, and supplies power to the corresponding powered device via the corresponding power supply port and the corresponding transformer group.

[0018] Optionally, the power supply module includes: a driving circuit, the output end of the driving circuit is connected to the control end of the switching element to output a driving signal, and the input end of the driving circuit is connected to the corresponding power supply port to input a detection signal; a switching element, the first end of the switching element is connected to the power port, the second end of the switching element is connected to the corresponding power supply port, and the control end of the switching element receives the driving signal.

[0019] Optionally, the driving circuit includes a driving unit and a detection unit, the detection unit is used to receive the detection signal, and identify the power classification of the powered device when a qualified powered device is connected to the corresponding power supply port; when the corresponding power supply port is connected to a qualified powered device and the power classification meets the requirements, the driving unit outputs the driving signal to control the switching element to turn on, and when the powered device connected to the power supply port does not meet the conditions or the power classification does not meet the requirements, the driving unit controls the switching element to turn off.

[0020] Optionally, when the switch element is turned on, the power supply current flows through the corresponding power supply port, the corresponding transformer group and the corresponding powered device to the ground terminal.

[0021] Optionally, the driving circuit and the switch element in the power supply module are integrated in the same first chip.

[0022] Optionally, the driving circuit in the power supply module is integrated in the second chip, and the switch element of the power supply module is a device independent of the second chip.

[0023] Optionally, the power supply module includes: a driving circuit, wherein the output end of the driving circuit is connected to the control end of the switching element to output a driving signal, and the input end of the driving circuit is connected to the corresponding power supply port to input a detection signal; a first switching element, wherein the first end of the first switching element is connected to the power port, the second end of the first switching element is connected to the corresponding power supply port, and the control end of the first switching element receives the driving signal; and a second switching element, wherein the first end of the second switching element is connected to the power port, the second end of the second switching element is connected to the corresponding power supply port, and the control end of the second switching element receives the driving signal, wherein the driving circuit and the first switching element are integrated in a third chip, and the second switching element is a device independent of the third chip.

[0024] Optionally, the switch element is a P-type field effect transistor or an N-type field effect transistor.

[0025] Optionally, the switch element is a P-type bipolar transistor or an N-type bipolar transistor.

[0026] Optionally, the transformer group includes a first transformer and a second transformer; the center tap of the primary winding of the first transformer is connected to the corresponding power supply port, and the center tap of the secondary winding of the first transformer is connected to the first input terminal of the corresponding powered device; the center tap of the primary winding of the second transformer is connected to the ground, and the center tap of the secondary winding of the second transformer is connected to the second input terminal of the corresponding powered device; the second transformers of the N transformer groups are connected to a common ground.

[0027] Optionally, the powered device includes: a rectifier circuit, whose two input ends are respectively connected to the center taps of the secondary windings of the first transformer and the second transformer of the corresponding transformer group; a powered controller, connected to the two output ends of the rectifier circuit, the powered controller is also connected to the ground end, and N powered controllers share a common ground; a load, connected between the two output ends of the powered controller; and a capacitor, connected between the two output ends of the rectifier circuit.

[0028] In summary, the present application proposes a power supply device and Ethernet power supply system that can realize the common ground design of multiple powered devices, and does not require a complex isolation structure to be set between the powered devices. Compared with the traditional solution, the power supply device of the present application can omit the isolation circuit between multiple powered devices at the power receiving end while ensuring the normal detection classification, thereby reducing the complexity and cost of the system, and will not introduce additional power consumption and energy loss, which is conducive to improving the efficiency of the system.

[0029] On the other hand, the Ethernet power supply system based on the embodiment of the present disclosure does not need to set up an isolation structure between multiple powered devices. Compared with traditional solutions, it reduces the design difficulty and implementation difficulty, improves adaptability, and can be applied to more diverse powered end system designs and various application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings.

[0031] Figure 1 A schematic block diagram of an Ethernet power supply system supporting the BT standard in the prior art is shown.

[0032] Figure 2a A schematic block diagram of an Ethernet power supply system according to a first embodiment of the utility model is shown.

[0033] Figure 2b A schematic block diagram of an Ethernet power supply system according to a second embodiment of the utility model is shown.

[0034] Figure 2c A schematic block diagram of an Ethernet power supply system according to a third embodiment of the present utility model is shown. DETAILED DESCRIPTION

[0035] Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by the same or similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale.

[0036] The present invention may be embodied in various forms, some examples of which will be described below.

[0037] Figure 1 A schematic block diagram of an Ethernet power supply system supporting the BT standard in the prior art is shown.

[0038] The Ethernet power supply system 100, for example, complies with the Ethernet power supply PoE standard approved by the Institute of Electrical and Electronics Engineers (IEEE) - IEEE 802.3af / IEEE 802.3at / IEEE 802.3BT, and can be implemented based on the existing Ethernet wiring infrastructure. Therefore, data transmission and power supply can be achieved based on the Ethernet cable L1, thereby ensuring that the Ethernet cable L1 can provide DC power to powered devices (such as IP phones, wireless LAN access points AP, security network cameras, and other IP-based terminals) while transmitting data signals to such devices.

[0039] IEEE802.3af is the earliest power detection and control specification in the power supply system approved by IEEE. It stipulates that the DC voltage output by the port is between 44 and 57V, and provides PD devices with four C1ass levels (C1ass0 to Class3) of power requests of 3.84 to 12.95W.

[0040] In 2009, IEEE introduced a new standard IEEE802.3at, which stipulates that the DC voltage output by the port is between 50 and 57V, and defines devices with a power level higher than 12.95W as C1ass4, and the power level of the powered device can be extended to 25.5W. On this basis, some chip manufacturers have made higher designs, such as MAX5980 supports private Class5 and can output up to 60W.

[0041] In 2018, in response to the growing demand for power supply, IEEE announced the IEEE802.3BT standard. Four new high-power PD classes were introduced, bringing the total number of single-signature classes to 9. Classes 5 to 8 are new to the PoE (Power On Ethernet) standard and translate into PD power levels of 40W to 71W.

[0042] like Figure 1 As shown, the Ethernet power supply system 100 includes a power supply device 110 arranged at a power supply end, a plurality of powered devices 121 and 122 arranged at a powered end, and an interface unit 130 arranged between the power supply device 110 and the plurality of powered devices 121 and 122 .

[0043] Specifically, the power supply device 110 may be a switch, a hub or a router, etc., and the powered devices 121 and 122 may be wireless access points, cameras, IP phones, etc. The power supply device 110 includes a power port VDD, a power supply controller 111, a plurality of switch elements M1 and M2, and a plurality of power supply ports N1 and N2.

[0044] The power receiving device 121 includes a rectifier circuit 114, a power receiving controller 115, a load 116, and a capacitor C1 connected between two output terminals of the rectifier circuit 114. The power receiving device 122 includes a rectifier circuit 117, a power receiving controller 118, a load 119, and a capacitor C2 connected between two output terminals of the rectifier circuit 117.

[0045] The interface unit 130 includes a plurality of transformers T1-T4. The input voltage VIN is connected to the center tap of the primary winding of the transformer T1, and the first input terminal P3 of the rectifier circuit 117 is connected to the center tap of the secondary winding of the transformer T1. The power supply port N2 of the power supply device 110 is connected to the center tap of the primary winding of the transformer T2, and the second input terminal P4 of the rectifier circuit 117 is connected to the center tap of the secondary winding of the transformer T2. The input voltage VIN is connected to the center tap of the primary winding of the transformer T3, and the first input terminal P1 of the rectifier circuit 114 is connected to the center tap of the secondary winding of the transformer T3. The power supply port N1 of the power supply device 110 is connected to the center tap of the primary winding of the transformer T4, and the second input terminal P2 of the rectifier circuit 114 is connected to the center tap of the secondary winding of the transformer T4.

[0046] In the prior art, when both the power supply device 110 and the powered devices 121-122 support automatic grading and the powered devices 121-122 are graded by automatic grading, an isolation circuit 140 needs to be set to isolate the grounds of the powered controllers 115 and 118 from each other. Otherwise, when the path where the power supply port N1 of the powered device 110 is located is in the power supply state, and the path where the power supply port N2 is located is in the graded detection state, the graded current on the load 119 will flow through the ground of the powered controller 118 to the output port of the powered controller 115, and then flow to the power supply port N1, so that the power supply port N2 cannot normally complete the graded detection function, and then cause the power supply failure of the powered device 122. Therefore, the Ethernet power supply system supporting the BT standard in the prior art needs to set at least one isolation circuit to achieve mutual isolation between the grounds of multiple powered devices, which will not only increase the complexity and cost of the system, but also introduce certain power consumption and energy loss, reducing the efficiency of the system.

[0047] Figure 2a and Figure 2b Schematic block diagrams of Ethernet power supply systems according to the first embodiment and the second embodiment of the utility model are shown respectively. For the convenience of illustration, Figure 2a and Figure 2b Some structures in the Ethernet power supply system are omitted. It should be understood that the omitted parts have been described in other parts of the embodiments of the present disclosure or can be inferred by those skilled in the art under the enlightenment of the contents of the present disclosure, and will not be described in detail.

[0048] like Figure 2a and Figure 2b As shown, the Ethernet power supply system (PoE system) 200 provided in this embodiment includes a power supply device 210 arranged at the power supply end, wherein the power supply device 210 can support the standard IEEE802.3BT protocol and supply power to N powered devices at the same time, where N is an integer greater than or equal to 1. For example, Figure 2a and Figure 2b The power supply device 210 can supply power to two powered devices (i.e., powered devices 221 and 222) at the same time. Of course, the present invention is not limited to this. Those skilled in the art can apply the power supply device 210 of this embodiment to supply power to four or eight powered devices according to specific applications. In addition, the PoE system 200 of this embodiment also includes an interface unit 230 provided between the power supply device 210 and the multiple powered devices 221 and 222.

[0049] Specifically, the power supply device 210 may be a switch, a hub or a router, etc., and the powered devices 221 and 222 may be wireless access points, cameras, IP phones, etc. The power supply device 210 includes a power port VDD and at least one power supply module. Figure 2a and Figure 2b In the illustrated embodiment, the power supply device 210 of the utility model includes two power supply modules 211 and 212, which is of course not limited in this embodiment. The power supply modules 211 and 212 are connected to the powered devices 221 and 222 in a one-to-one correspondence via the interface unit 230. In addition, the power supply modules 211 and 212 are connected between the power port VDD and the corresponding power supply ports N1 and N2, receive input voltage via the power port VDD, and supply power to the corresponding powered devices 221 and 222 via the corresponding power supply ports N1 and N2 and the interface unit 230. Among them, the power port VDD is used to connect to the external input voltage VIN (for example, +48V), and at least one power supply module is the main circuit of the power supply device 210, which is mainly used to communicate and interact with the powered device connected to the power supply port to realize the functions required by the Ethernet system such as detection, classification, power on and / or power off.

[0050] Furthermore, each power supply module includes a driving circuit and a corresponding switching element. Taking the power supply module 211 as an example, the power supply module 211 includes a driving circuit 241 and a switching element M1, the first end of the switching element M1 is connected to the power port VDD to receive the input voltage VIN, the second end of the switching element M1 is connected to the corresponding power supply port N1, and the control end of the switching element M1 is connected to the driving circuit 241. The power supply module 212 includes a driving circuit 242 and a switching element M2, the first end of the switching element M2 is connected to the power port VDD to receive the input voltage VIN, the second end of the switching element M2 is connected to the corresponding power supply port, and the control end of the switching element M2 is connected to the driving circuit 242.

[0051] Detection: When a power supply port of the power supply device 210 is connected to the powered device, the power supply device 210 generally needs to use a limited power test source located at the power supply end to detect the characteristic impedance of the powered device before supplying power to the connected powered device via the Ethernet cable, so as to prevent the power provided by the power supply device 210 from being provided to the powered device that is not compatible with PoE. The test source, for example, first uses a lower detection voltage (for example, multiple voltages between 2.5 and 10V) to detect whether the powered device has been connected to the power supply device 210 via the Ethernet cable, and then the powered device feeds back information (for example, impedance, current) to at least one power supply module based on the detection voltage, and at least one power supply module determines whether the characteristic impedance of the powered device meets the power receiving requirements based on the feedback information.

[0052] Classification: When the connected powered device meets the power requirements, at least one power supply module also needs to provide power of the corresponding level according to the power consumption of the powered device. During the classification process, at least one power supply module, for example, uses a higher detection voltage (for example, 15.5V to 20.5V) to detect the power level of the powered device. The powered device can obtain a basically constant characteristic current from the Ethernet cable, so that at least one power supply module can understand the power level of the powered device by detecting the characteristic current and provide corresponding power according to the power level.

[0053] Power on: After detection and / or classification, the power supply device 210 may start to supply power to the powered device. During the power on process, at least one power supply module may turn on the switch element of the corresponding power supply channel to provide voltage to the corresponding powered device through the Ethernet cable.

[0054] Power off: To ensure that the power consumption and current of the powered device are within a reasonable range, when the power required by the powered device exceeds the maximum power that the power supply device 210 can output, at least one power supply module disconnects the switch element of the corresponding power supply channel to stop supplying power to the powered device.

[0055] For example, each driving circuit includes a driving unit and a detection unit. Figure 2a and Figure 2b In the embodiment, the driving circuit 241 includes a detection unit 201 and a driving unit 202 , and the driving circuit 242 includes a detection unit 203 and a driving unit 204 .

[0056] The driving unit 204 is connected to the control end of the switch element M2 through the control end GATE2 of the driving circuit 242, and the detection unit 203 is connected to the second end of the switch element M2 and the power supply port N2 through the feedback end SENSE2 of the driving circuit 242. The driving unit 202 is connected to the control end of the switch element M1 through the control end GATE1 of the driving circuit 241, and the detection unit 201 is connected to the second end of the switch element M1 and the power supply port N1 through the feedback end SENSE1 of the driving circuit 241.

[0057] When a qualified PD powered device is connected to a power supply port, the detection unit sends a detection voltage to the powered device connected thereto through the power supply port, and detects the magnitude of the identification current fed back by the powered device after receiving the detection voltage, and then determines the power of the powered device according to the magnitude of the detected identification current. If the power identified by the identification current is within a predetermined power classification (for example, class0=15.4W, class1=4W, class2=7W, class3=15.4W, class4=30W), the corresponding switch element is turned on by the driving unit to supply power to the powered device, otherwise the corresponding switch element is turned off to prohibit power supply to the powered device.

[0058] The power receiving device 221 includes a rectifier circuit 214, a power receiving controller 215, a load 216, and a capacitor C1 connected between two output terminals of the rectifier circuit 214. The power receiving device 222 includes a rectifier circuit 117, a power receiving controller 118, a load 119, and a capacitor C2 connected between two output terminals of the rectifier circuit 117.

[0059] The interface unit 230 includes a plurality of transformer groups corresponding to the plurality of power supply ports of the power supply device 210 and the plurality of powered devices, each transformer group includes two transformers, for example, Figure 2a and Figure 2b2. The transformers T1-T4 shown in FIG. 2. The center tap of the primary winding of the transformer T1 is connected to the power supply port N2 of the power supply device 210, and the center tap of the secondary winding of the transformer T1 is connected to the first input terminal P3 of the rectifier circuit 217. The center tap of the primary winding of the transformer T2 is connected to the ground, and the center tap of the secondary winding of the transformer T2 is connected to the second input terminal P4 of the rectifier circuit 217. The two output terminals of the rectifier circuit 217 are connected to the power receiving controller 218, and the load 219 is connected between the two output terminals of the power receiving controller 218. The center tap of the primary winding of the transformer T3 is connected to the power supply port N1 of the power supply device 210, and the center tap of the secondary winding of the transformer T3 is connected to the first input terminal P1 of the rectifier circuit 214. The center tap of the primary winding of the transformer T4 is connected to the ground, and the center tap of the secondary winding of the transformer T4 is connected to the second input terminal P2 of the rectifier circuit 214. Two output terminals of the rectifier circuit 214 are connected to the power receiving controller 215 , and the load 216 is connected between the two output terminals of the power receiving controller 215 .

[0060] For example, the interface unit 230 can be set at the power supply end or the power receiving end. When the interface unit 230 is set at the power supply end, the interface unit 230 and the powered devices 221 and 222 are connected via an Ethernet cable. When the interface unit 230 is set at the power receiving end, the interface unit 230 and the power supply device 210 are connected via an Ethernet cable. As an optional example, the Ethernet cable can be implemented by two differential transmission lines, two differential reception lines, two differential high-level power lines and two differential low-level power lines implemented by standard cables such as Category 5 cable (CAT.5, usually based on twisted pair) or Category 6 cable (CAT.6, usually based on twisted pair), or a simplified Ethernet cable including only two differential transmission lines and two differential reception lines can be selected. The Ethernet cable can be connected to the powered device or the power supply device using an RJ45 connector, for example. As an optional embodiment, data transmission based on Ethernet cables follows the TCP / IP protocol, for example, to achieve reliable communication based on IP addresses. The process of the powered device exchanging data information with an external device (for example, the power supply device 110) via an Ethernet cable includes, for example: based on the TCP / IP protocol, packaging or parsing the information to be sent into data that complies with the TCP / IP protocol, and then sending the data to the corresponding external device via the Ethernet cable through a series of physical layer modules.

[0061] Among them, at least one power supply module can be a PSE chip, the power receiving controllers 215 and 218 can be PD chips, and the rectifier circuits 214 and 217 can be bridge rectifier circuits. The grounding terminals of the PSE chip, the PD chip and the load are all connected to the ground.

[0062] In this embodiment, by connecting the switch element in the power supply device 210 between the power port and the power supply port, compared with the traditional solution of connecting between the power supply port and the ground, regardless of whether the power supply current of the channel in the power supply state is shunted to other channels in the hierarchical detection process, since the switch elements of all channels are connected between the power port and the power supply port, the shunted current cannot flow to the switch element through the common ground end, and thus the current flowing through the switch element is unchanged, so that the power supply module of the power supply device can accurately complete the hierarchical detection at the power supply port, thereby realizing normal power supply to the connected powered device. In addition, compared with the traditional solution, the Ethernet power supply system of this embodiment can omit the isolation circuit set between the powered devices, thereby reducing the complexity and cost of the system, and will not introduce additional power consumption and energy loss, which is conducive to improving the efficiency of the system.

[0063] Taking the power supply module 212 as an example, when in the power supply state, the power supply current flows through the transformer T1 via the power supply port N2, then flows to the first input terminal P3 of the rectifier circuit 217, then flows through the load 219 via the rectifier circuit 217 and flows out from the second input terminal P4, and then flows to the ground terminal through the transformer T2. It will not be diverted to the power supply port of the power supply module 211, and therefore will not affect the graded detection of the power supply module 211.

[0064] As an example, Figure 2a and 2b As shown, the switch elements M1 and M2 can be implemented by transistors of various structural types and conductivity types, including but not limited to P-type or N-type field effect transistors and P-type or N-type bipolar transistors.

[0065] As an example, Figure 2a As shown, the switching elements M1 and M2 are, for example, N-type metal-oxide field effect transistors (NMOS transistors), whose drains are connected to the input voltage VIN as the first end of the switching element, whose sources are connected to the power supply port of the power supply device 210 as the second end of the switching element, and whose gates are connected to the control end of at least one power supply module.

[0066] As another example, Figure 2b As shown, the switching elements M1 and M2 are, for example, P-type metal-oxide field effect transistors (PMOS transistors), whose sources are connected to the input voltage VIN as the first end of the switching element, whose drains are connected to the power supply port of the power supply device 210 as the second end of the switching element, and whose gates are connected to the control end of at least one power supply module.

[0067] Figure 2cAn exemplary block diagram of an Ethernet power supply system according to the third embodiment of the utility model is shown. The Ethernet power supply system of this embodiment is different from the first and second embodiments in that: the power supply module of this embodiment includes a plurality of switching elements. Taking the power supply module 211 as an example, the power supply module 211 of this embodiment includes a drive circuit 241 and switch elements M1 and M3. Among them, the drive circuit 241 and the switch element M1 are formed on the same substrate to be integrated in the same chip structure, and the switch element M3 is formed on a different substrate and integrated outside the chip structure. In another optional example, the switch elements M1-M2 and / or M3-M4 and the drive circuit can also be formed on different substrates to form different chip structures, and the present disclosure does not limit this.

[0068] In summary, the present application proposes a power supply device and Ethernet power supply system that can realize the common ground design of multiple powered devices, and does not require a complex isolation structure to be set between the powered devices. Compared with the traditional solution, the power supply device of the present application can omit the isolation circuit between multiple powered devices at the power receiving end while ensuring the normal detection classification, thereby reducing the complexity and cost of the system, and will not introduce additional power consumption and energy loss, which is conducive to improving the efficiency of the system.

[0069] On the other hand, the Ethernet power supply system based on the embodiment of the present disclosure does not need to set up an isolation structure between multiple powered devices. Compared with traditional solutions, it reduces the design difficulty and implementation difficulty, improves adaptability, and can be applied to more diverse powered end system designs and various application scenarios.

[0070] On the other hand, when a short circuit or other interference occurs at the ground terminal of the power supply device of the present application, since the switching element is not directly grounded, the switching element will not be interfered by the ground terminal, the hierarchical detection is more accurate, and the reliability of power supply is improved.

[0071] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0072] The embodiments of the present invention are described above, and these embodiments do not describe all the details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modifications based on the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A power supply device, characterized in that: include: N power supply modules, where N is an integer greater than or equal to 1, and the N power supply modules are connected to corresponding transformer groups and corresponding powered devices in a one-to-one correspondence; Each of the power supply modules is connected to the corresponding transformer group via a corresponding power supply port; The power supply module is connected between the power port and the corresponding power supply port, receives input voltage via the power port, and supplies power to the corresponding powered device via the corresponding power supply port and the corresponding transformer group.

2. The power supply device according to claim 1, characterized in that: The power supply module comprises: A driving circuit, wherein an output end of the driving circuit is connected to a control end of a switching element to output a driving signal, and an input end of the driving circuit is connected to a corresponding power supply port to input a detection signal; A switch element, wherein a first end of the switch element is connected to the power supply port, a second end of the switch element is connected to the corresponding power supply port, and a control end of the switch element receives the drive signal.

3. The power supply device according to claim 2, characterized in that: The driving circuit includes a driving unit and a detection unit. The detection unit is used to receive the detection signal and identify the power classification of the powered device when a qualified powered device is connected to the corresponding power supply port; The driving unit outputs the driving signal to control the switch element to turn on when the corresponding power supply port is connected to a powered device that meets the conditions and whose power classification meets the requirements, and controls the switch element to turn off when the powered device connected to the corresponding power supply port does not meet the conditions or the power classification does not meet the requirements.

4. The power supply device according to claim 3, characterized in that: When the switch element is turned on, the power supply current flows through the corresponding power supply port, the corresponding transformer group and the corresponding powered device to the ground terminal.

5. The power supply device according to claim 2, characterized in that: The driving circuit and the switch element in the power supply module are integrated in the same first chip.

6. The power supply device according to claim 2, characterized in that: The driving circuit in the power supply module is integrated in the second chip, and the switch element of the power supply module is a device independent of the second chip.

7. The power supply device according to claim 1, characterized in that: The power supply module comprises: A driving circuit, wherein the output end of the driving circuit is connected to the control end of the switch element and outputs a driving signal, and the input end of the driving circuit is connected to the corresponding power supply port and inputs a detection signal; a first switch element, wherein a first end of the first switch element is connected to the power port, a second end of the first switch element is connected to a corresponding power supply port, and a control end of the first switch element receives the driving signal; and a second switch element, wherein a first end of the second switch element is connected to the power supply port, a second end of the second switch element is connected to the corresponding power supply port, and a control end of the second switch element receives the driving signal; The driving circuit and the first switch element are integrated into a third chip, and the second switch element is a device independent of the third chip.

8. The power supply device according to claim 2, characterized in that: The switch element is a P-type field effect transistor or an N-type field effect transistor.

9. The power supply device according to claim 2, characterized in that: The switch element is a P-type bipolar transistor or an N-type bipolar transistor.

10. An Ethernet power supply system, characterized in that: include: N power supply modules, N transformer groups and N powered devices, wherein N is an integer greater than or equal to 1, and the N power supply modules are connected to the corresponding transformer groups and the corresponding powered devices in a one-to-one correspondence; Each of the power supply modules is connected to the corresponding transformer group via a corresponding power supply port; The power supply module is connected between the power port and the corresponding power supply port, receives input voltage via the power port, and supplies power to the corresponding powered device via the corresponding power supply port and the corresponding transformer group.

11. The Ethernet power supply system according to claim 10, characterized in that: The power supply module comprises: A driving circuit, wherein an output end of the driving circuit is connected to a control end of a switching element to output a driving signal, and an input end of the driving circuit is connected to a corresponding power supply port to input a detection signal; A switch element, wherein a first end of the switch element is connected to the power supply port, a second end of the switch element is connected to the corresponding power supply port, and a control end of the switch element receives the drive signal.

12. The Ethernet power supply system according to claim 11, characterized in that: The driving circuit includes a driving unit and a detection unit. The detection unit is used to receive the detection signal and identify the power classification of the powered device when a qualified powered device is connected to the corresponding power supply port; The driving unit outputs the driving signal to control the switch element to turn on when the corresponding power supply port is connected to a powered device that meets the conditions and whose power classification meets the requirements, and controls the switch element to turn off when the powered device connected to the power supply port does not meet the conditions or the power classification does not meet the requirements.

13. The Ethernet power supply system according to claim 12, characterized in that: When the switch element is turned on, the power supply current flows through the corresponding power supply port, the corresponding transformer group and the corresponding powered device to the ground terminal.

14. The Ethernet power supply system according to claim 11, characterized in that: The driving circuit and the switch element in the power supply module are integrated in the same first chip.

15. The Ethernet power supply system according to claim 11, characterized in that: The driving circuit in the power supply module is integrated in the second chip, and the switch element of the power supply module is a device independent of the second chip.

16. The Ethernet power supply system according to claim 10, characterized in that: The power supply module comprises: A driving circuit, wherein the output end of the driving circuit is connected to the control end of the switch element and outputs a driving signal, and the input end of the driving circuit is connected to the corresponding power supply port and inputs a detection signal; a first switch element, wherein a first end of the first switch element is connected to the power port, a second end of the first switch element is connected to a corresponding power supply port, and a control end of the first switch element receives the driving signal; and a second switch element, wherein a first end of the second switch element is connected to the power supply port, a second end of the second switch element is connected to the corresponding power supply port, and a control end of the second switch element receives the driving signal; The driving circuit and the first switch element are integrated into a third chip, and the second switch element is a device independent of the third chip.

17. The Ethernet power supply system according to claim 11, characterized in that: The switch element is a P-type field effect transistor or an N-type field effect transistor.

18. The Ethernet power supply system according to claim 11, characterized in that: The switch element is a P-type bipolar transistor or an N-type bipolar transistor.

19. The Ethernet power supply system according to claim 10, characterized in that: The transformer group includes a first transformer and a second transformer; The center tap of the primary winding of the first transformer is connected to the corresponding power supply port, and the center tap of the secondary winding of the first transformer is connected to the first input terminal of the corresponding powered device; A center tap of the primary winding of the second transformer is connected to the ground, and a center tap of the secondary winding of the second transformer is connected to a second input terminal of the corresponding powered device; The second transformers of the N transformer groups are connected to a common ground.

20. The Ethernet power supply system according to claim 10, characterized in that: The powered device comprises: A rectifier circuit, two input ends of which are respectively connected to the center taps of the secondary windings of the first transformer and the second transformer of the corresponding transformer group; A power receiving controller connected to the two output terminals of the rectifier circuit, the power receiving controller is also connected to the ground terminal, and N power receiving controllers share a common ground; A load connected between two output terminals of the power receiving controller; and The capacitor is connected between the two output terminals of the rectifier circuit.

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