Isolation device, isolation assembly, power supply equipment and Ethernet power supply system

Abstract

The invention provides an isolation device, an isolation assembly, power supply equipment and an Ethernet power supply system, and belongs to the technical field of Ethernet power supply. In the isolation device provided by the invention, the at least one transformer can realize transmission of data signals, and the current protector can realize transmission of voltage signals, so that normal operation of a PoE system can be ensured. Moreover, when electric leakage occurs in the PoE system, the current protector can be turned off, so that leakage voltage or leakage current can be prevented from flowing back to the power supply equipment, and the probability of damage to the power supply equipment is effectively reduced. In addition, after the current protector is turned off, the at least one transformer can still work normally, and correspondingly, the data transmission function of the PoE system is not affected.

Description

Technical Field

[0001] The present application relates to the technical field of Ethernet power supply, and in particular to an isolation device, an isolation component, a power supply device and an Ethernet power supply system. Background Art

[0002] The power over Ethernet (PoE) system generally includes power sourcing equipment (PSE) and powered device (PD), which can be connected via an Ethernet twisted pair cable. The PSE can not only power the PD via the Ethernet twisted pair cable, but also exchange data signals with the PD via the Ethernet twisted pair cable.

[0003] During the operation of the PoE system, if the PD housing is abnormally connected to the external power grid, or the Ethernet twisted pair is abnormally connected to the external wire, an abnormal leakage voltage will be loaded on the Ethernet twisted pair. This abnormal leakage voltage will flow back into the PSE, causing the internal components of the PSE (such as transformers, physical layer chips, and protection components, etc.) to be burned. Summary of the invention

[0004] The present application provides an isolation device, an isolation assembly, a power supply device and an Ethernet power supply system, which can solve the technical problem in the related art that the abnormal leakage voltage loaded on the Ethernet twisted pair line is backflowed to the PSE, causing the devices in the PSE to be burned.

[0005] In the first aspect, an isolation device is provided, which is applied to an Ethernet power supply system, and the Ethernet power supply system includes a power supply device and a powered device. The isolation device includes: a current protector and at least one transformer, and the at least one transformer is used to connect between a first chip of the power supply device and a second chip of the powered device, the first chip includes a power supply chip and a physical layer chip, and the second chip includes a powered chip and a physical layer chip. Among them, one end of the current protector is connected to the first center tap of the at least one transformer close to the first chip, and the other end of the current protector is connected to the second center tap of the at least one transformer close to the second chip. In addition, the current protector is used to disconnect the first center tap from the second center tap if the current flowing through is greater than a threshold. That is, the current protector is used to maintain an off state when the current is overloaded.

[0006] When leakage occurs in the PoE system, the current protector in the isolation device can be turned off, thereby preventing the leakage voltage or leakage current from flowing back to the power supply device, effectively reducing the probability of damage to the power supply device. In addition, after the current protector is turned off, at least one transformer in the isolation device can still work normally, and accordingly, the data transmission function of the PoE system is not affected.

[0007] Optionally, the isolation device may include a transformer. The first side winding of the transformer is used to connect to the first chip, and the second side winding of the transformer is used to connect to the second chip. Accordingly, the first center tap is the center tap of the first side winding, and the second center tap is the center tap of the second side winding.

[0008] It is understandable that if the first side winding and the second side winding of the transformer both support PoE current flow, that is, the current flow capacity of the windings on both sides of the transformer is greater than the current threshold, then only one transformer can be used in the isolation device. Thus, the volume of the isolation device can be effectively reduced.

[0009] Optionally, the at least one transformer may include: a first transformer and a second transformer. The first side winding of the first transformer is used to connect to the first chip, the first side winding of the second transformer is used to connect to the second chip, and the second side winding of the first transformer is connected to the second side winding of the second transformer. Correspondingly, the first center tap is the center tap of the first side winding of the first transformer, and the second center tap is the center tap of the first side winding of the second transformer.

[0010] In the solution provided in the present application, the isolation device can also be formed by connecting two transformers in cascade, and the current protector is connected across the two sides of the two transformers to achieve the isolation protection function.

[0011] Optionally, the current carrying capacity of the first side winding of the first transformer and the first side winding of the second transformer may both be greater than or equal to a current threshold. Furthermore, the current carrying capacity of the second side winding of the first transformer and the second side winding of the second transformer are both less than the current threshold. That is, both transformers in the isolation device can be transformers that only support PoE current on one side winding, thereby effectively reducing the requirements for the heat dissipation capacity of the transformer.

[0012] It is understandable that, in the scenario where the isolation device uses two transformers in cascade connection, the two transformers can also be transformers with both windings on both sides supporting PoE current. Alternatively, one of the two transformers has both windings on both sides supporting PoE current, and the other transformer has only one winding on one side supporting PoE current.

[0013] Optionally, the current protector may be a fuse, a current limiting chip or a thermistor. If a fuse is used as the current protector, the isolation device can be small in size and low in cost. If a current limiting chip or a thermistor (such as a thermistor) is used as the current protector, multiple leakage protections can be achieved because the protection function of the above devices can be restored after the voltage or current is reduced.

[0014] Optionally, the current protector may be a fast-blow fuse, which can be quickly blown when the current flowing through the fast-blow fuse is greater than a threshold value, thereby effectively preventing the transformer from being damaged.

[0015] In a second aspect, an isolation assembly is provided, which includes a plurality of isolation devices provided in the first aspect.

[0016] Optionally, the isolation assembly may include four isolation devices, and the four isolation devices may be encapsulated in a housing.

[0017] In a third aspect, a power supply device is provided, which may include: a power supply chip, a physical layer chip, an Ethernet electrical port, and an isolation component as provided in the second aspect above. The power supply chip and the physical layer chip are connected to the Ethernet electrical port through the isolation component.

[0018] The solution provided by the present application can encapsulate the isolation component in the power supply device, thereby effectively simplifying the structural complexity of the PoE system. It is understandable that if the power supply device includes multiple Ethernet electrical ports, the power supply device can be integrated with multiple isolation components corresponding to the multiple Ethernet electrical ports.

[0019] Optionally, the Ethernet electrical port may include four pairs of pins, and the isolation component may include four isolation devices corresponding to the four pairs of pins one by one, wherein each isolation device may be connected to a corresponding pair of pins.

[0020] In a fourth aspect, an Ethernet power supply system is provided, the Ethernet power supply system comprising: a power supply device, a powered device, and an Ethernet twisted pair cable. The power supply device is a power supply device with an integrated isolation component as provided in the third aspect above, and the power supply device is connected to the powered device via the Ethernet twisted pair cable.

[0021] In a fifth aspect, an Ethernet power supply system is provided, the Ethernet power supply system comprising: a power supply device, a powered device, an Ethernet twisted pair, and an isolation component as provided in the second aspect above, wherein the power supply device and the powered device are connected via an Ethernet twisted pair, and the isolation component is connected in series to the Ethernet twisted pair.

[0022] Optionally, the Ethernet twisted pair may include 4 pairs of signal lines, and the isolation component may include: 4 isolation devices corresponding to the 4 pairs of signal lines one by one, wherein each isolation device is connected in series to a corresponding pair of signal lines.

[0023] Based on the above fourth and fifth aspects, it can be known that the isolation component provided in the present application can be an independently deployed device or integrated in a power supply device.

[0024] In summary, the present application provides an isolation device, an isolation component, a power supply device and an Ethernet power supply system. In the solution provided by the present application, at least one transformer in the isolation device can realize the transmission of data signals, and the current protector can realize the transmission of voltage signals, thereby ensuring that the PoE system can operate normally. In addition, when leakage occurs in the PoE system, the current protector can be turned off, thereby preventing the leakage voltage or leakage current from flowing back to the power supply device, effectively reducing the probability of damage to the power supply device. In addition, after the current protector is turned off, the at least one transformer can still operate normally, and accordingly, the data transmission function of the PoE system is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of leakage in an Ethernet power supply system provided by an embodiment of the present application;

[0026] Figure 2 is a schematic diagram of the structure of an isolation device provided in an embodiment of the present application;

[0027] Figure 3 is a schematic diagram of the structure of another isolation device provided in an embodiment of the present application;

[0028] Figure 4 It is a structural schematic diagram of an Ethernet power supply system provided in an embodiment of the present application;

[0029] Figure 5 is a structural schematic diagram of another Ethernet power supply system provided in an embodiment of the present application;

[0030] Figure 6 It is a structural schematic diagram of a power supply device provided in an embodiment of the present application;

[0031] Figure 7 It is a structural schematic diagram of another Ethernet power supply system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The isolation device, isolation assembly, power supply equipment and Ethernet power supply system provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0033] Based on the provisions of the Institute of Electrical and Electronics Engineers (IEEE) 802.3af, IEEE 802.3at and IEEE 802.3bt standards, PoE systems generally use 2 or 4 pairs of copper wires in Ethernet twisted pair cables to power PDs from PSE, with the power supply voltage not exceeding 44 volts (V) to 57V. At the same time, Ethernet twisted pair cables can also be used for data transmission. For example, refer to Figure 1 The Ethernet twisted pair cable includes 4 pairs of copper wires from pair A to pair D, among which pair A and pair D are loaded with a voltage of -48V, and pair B and pair C can be used as return (RTN) lines, also known as power ground lines.

[0034] Among them, PSE is generally a device such as a switch or router, which has one or more Ethernet electrical ports and can simultaneously power one or more PDs. PD is generally a device such as a wireless local area network (WLAN) access point (AP), a camera or a phone that requires external power supply and the power is no more than 71.3 watts (W).

[0035] The IEEE protocol specifies a relatively complete protection mechanism to ensure the safe application of PoE power supply technology. For example, when a short circuit occurs in the twisted pair between the PSE and the PD, the PSE will quickly shut down the power supply to protect the PSE, PD, twisted pair, and users to prevent accidents.

[0036] As PoE technology is gradually promoted and deployed, customer networks become more and more complex, and some abnormal situations that cannot be protected by IEEE protocols have occurred, resulting in various PSE damages and even fires. Figure 1 As shown in the figure, if the PD housing is abnormally connected to the external power grid, the twisted pair is abnormally connected to the external wire, or there is a problem with the PD design, an abnormal voltage will be reversed on the twisted pair, which may be as low as 80V or as high as 300V or even higher. This abnormal leakage will directly reverse into the PSE. The network transformer, physical layer (PHY) chip and protection device inside the PSE cannot withstand such abnormal voltage reverse flow, which will directly cause the PSE to burn out.

[0037] To address this problem, the industry usually adds an isolation device to the twisted pair, such as a 1:1 network transformer. The protection principle of the isolation device is: pass AC and block DC. After connecting an isolation device in series to the twisted pair, the data signal can pass normally, but the leakage voltage cannot pass and will not flow back into the PSE, thereby achieving effective protection for the PSE.

[0038] However, the above isolation device not only blocks the leakage voltage from flowing back to the PSE, but also blocks the power supply voltage from the PSE to the PD, which means that only data can be transmitted between the PSE and the PD, and the PoE voltage cannot be transmitted. In other words, the PoE function of the PSE is also lost.

[0039] The present application provides an isolation device, which can be applied to Figure 1 In the PoE system shown in FIG, the leakage voltage and leakage current can be effectively isolated without affecting the normal operation of the PoE system, thereby effectively ensuring the safety of the PSE. Figure 2 As shown, the isolation device includes: a current protector 10 and at least one transformer 20. For example, Figure 2 A transformer 20 is schematically shown in FIG.

[0040] The at least one transformer 20 is used to connect between the first chip of the power supply device and the second chip of the powered device. For example, the at least one transformer 20 can be connected between the first chip and the second chip via an Ethernet twisted pair. The first chip may include a power supply chip and a physical layer chip, and the second chip may include a powered chip and a physical layer chip. The power supply chip may also be called a PSE chip, and the powered chip may also be called a PD chip. The PSE chip and the PD chip are used to implement the PoE voltage transmission function, and the physical layer chips in the power supply device and the powered device are used to implement the data transmission function.

[0041] Continue to refer Figure 2 One end of the current protector 10 is connected to a first center tap of the at least one transformer 20 close to the first chip, and the other end of the current protector is connected to a second center tap of the at least one transformer 20 close to the second chip.

[0042] The current protector 10 is used to disconnect the first center tap from the second center tap if the current flowing through it is greater than a threshold value. Alternatively, it can be understood that: the current protector 10 is used to disconnect the connection between its two ends if the current flowing through it is greater than a threshold value, that is, the current protector 10 can be in an off state. Among them, the threshold value can be determined based on the upper limit of the current that the power supply device can withstand.

[0043] It can be understood that at least one transformer 20 in the isolation device can realize data transmission between the power supply device and the powered device. The current protector 10 can be used to realize voltage transmission between the power supply device and the powered device. If leakage occurs in the PoE system, the current protector 10 can disconnect the connection between the first center tap and the second center tap, that is, the current protector 10 can be turned off, thereby preventing the leakage voltage or leakage current from flowing back to the PSE.

[0044] In summary, the embodiment of the present application provides an isolation device, in which at least one transformer can realize the transmission of data signals, and the current protector can realize the transmission of voltage signals, thereby ensuring that the PoE system can operate normally. Moreover, when leakage occurs in the PoE system, the current protector can be turned off, thereby preventing the leakage voltage or leakage current from flowing back to the power supply device, effectively reducing the probability of damage to the power supply device. In addition, after the current protector is turned off, the at least one transformer can still operate normally, and accordingly, the data transmission function of the PoE system is not affected.

[0045] As a first optional implementation, if the transformer 20 used in the isolation device is a transformer with both double-sided windings supporting the PoE function, then Figure 2 As shown, the isolation device may include a transformer 20. The first side winding (TD+, TD-) of the transformer 20 is used to connect to the first chip, and the second side winding (MX+, MX-) of the transformer 20 is used to connect to the second chip. Accordingly, the first center tap may be a center tap TCT of the first side winding of the transformer 20, and the second center tap may be a center tap MCT of the second side winding of the transformer 20.

[0046] It is understandable that if both sides of the transformer 20 support the PoE function, the current carrying capacity of the windings on both sides of the transformer 20 is greater than or equal to the current threshold, and the current threshold may be the current value required to support PoE current.

[0047] For example, for a PoE function supporting 154W of the IEEE 802.3af standard, the current threshold may be 0.35 amperes (A), that is, the current carrying capacity of the windings on both sides of the transformer 20 is greater than or equal to 0.35 A. For a PoE function supporting 30W of the IEEE 802.3at standard, the current threshold may be 0.7A, that is, the current carrying capacity of the windings on both sides of the transformer 20 is greater than or equal to 0.7A.

[0048] As a second optional implementation, if the transformer 20 used in the isolation device is a transformer that supports the PoE function on only one side (i.e., winding on one side), then Figure 3As shown, the at least one transformer 20 may include: a first transformer 20a and a second transformer 20b.

[0049] Among them, the first side winding (MX+, MX-) of the first transformer 20a is used to connect to the first chip, the first side winding (MX+, MX-) of the second transformer 20b is used to connect to the second chip, and the second side winding (TD+, TD-) of the first transformer 20a is connected to the second side winding (TD+, TD-) of the second transformer 20b.

[0050] Correspondingly, the first center tap may be a center tap of the first side winding of the first transformer 20a, and the second center tap may be a center tap of the first side winding of the second transformer 20b. Figure 3 It can be seen that the center tap TCT of the second side winding of the first transformer 20a and the center tap TCT of the second side winding of the second transformer 20b can both be suspended.

[0051] It can be understood that in the second implementation, the current carrying capacity of the first side winding of the first transformer 20a and the first side winding of the second transformer 20b are both greater than or equal to the current threshold. In addition, the current carrying capacity of the second side winding of the first transformer 20a and the second side winding of the second transformer 20b are both less than the current threshold. That is, the first side windings of the first transformer 20a and the second transformer 20b both support PoE current carrying, and the second side windings of the first transformer 20a and the second transformer 20b do not support PoE current carrying.

[0052] Optionally, in the second implementation, the first side of the first transformer 20a and the second transformer 20b can be called the M side or the line side, and the second side of the first transformer 20a and the second transformer 20b can be called the transmit (transmit, T) side, the chip side or the PHY side.

[0053] Comparing the above two implementations, it can be seen that the number of transformers required for the first implementation is small, which can ensure that the isolation device is small in size. Although the number of transformers required for the second implementation is large, since only one side of the transformer winding supports PoE current flow, and the other side winding does not need to support PoE current flow, the heat dissipation capacity requirements of the transformer are relatively low. Accordingly, the cost of the transformer required for the second implementation is relatively low, which can effectively reduce the cost of the isolation device.

[0054] It can also be understood that for a transformer 20 with both windings on both sides supporting the PoE function, that is, a transformer 20 with both windings on both sides having a current carrying capacity greater than the current threshold, the Figure 3The cascade connection is performed in the manner shown, and the current protector 10 is connected across the two sides of the two transformers. That is, the first transformer 20a and the second transformer 20b in the isolation device can both be transformers with a current carrying capacity of the windings on both sides greater than the current threshold. Since this connection method allows only one side of the winding of each transformer to carry PoE current, the heat dissipation of the isolation device can be effectively improved.

[0055] It can also be understood that one of the first transformer 20a and the second transformer 20b can be a transformer with both windings on both sides supporting PoE current flow, and the other transformer can be a transformer with only one winding on one side supporting PoE current flow. In addition, the two ends of the current protector 10 are connected across the center taps of the windings on one side of the two transformers supporting PoE current flow.

[0056] Optionally, in the embodiment of the present application, the current protector 10 may be a fuse, a current limiting chip or a thermistor sensitive to current. For example, the thermistor may be a thermistor. Of course, in addition to the above devices, other current-sensitive devices with current limiting function may also be used as current protectors, and the embodiment of the present application does not limit this.

[0057] Optionally, if the current protector 10 is a fuse, the fuse may be a fast-acting fuse (also called a fast fuse), which may blow quickly when the current flowing through the fuse is greater than a threshold value, thereby effectively preventing the transformer 20 from being damaged.

[0058] It is understandable that multiple leakage protection can be achieved by using a current limiting chip, a thermistor or other device with similar functions that can restore the protection function after the voltage or current decreases as the current protector 10. Using a fuse as the current protector 10 can effectively avoid increasing the size and cost of the isolation device.

[0059] It can also be understood that the isolation device provided in the embodiment of the present application is not limited to the voltage protection of 44V to 57V specified in the IEEE 802.3af / 802.3at / 802.3bt standards. By adjusting the selection of the current protector 10 such as the fuse in the isolation device, the isolation device can also be suitable for the protection of voltages such as 24V.

[0060] In summary, the embodiment of the present application provides an isolation device, in which at least one transformer can realize the transmission of data signals, and the current protector can realize the transmission of voltage signals, thereby ensuring that the PoE system can operate normally. Moreover, when leakage occurs in the PoE system, the current protector can be turned off, thereby preventing the leakage voltage or leakage current from flowing back to the power supply device, effectively reducing the probability of damage to the power supply device. In addition, after the current protector is turned off, the at least one transformer can still operate normally, and accordingly, the data transmission function of the PoE system is not affected.

[0061] The present application also provides an isolation component, such as Figure 4 and Figure 5 As shown, the isolation assembly 03 may include a plurality of isolation devices as provided in the above embodiments. For example, the isolation assembly may include a housing, and the plurality of isolation devices may be encapsulated in the housing.

[0062] Optionally, the isolation component 03 may include 4 isolation devices. Figure 4 The isolation component 03 may include 4 transformers from T0 to T3, and 4 current protectors from F0 to F3 ( Figure 3 Taking a fuse as an example, each current protector is connected across two sides of a transformer. Among them, transformer T0 and current protector F0 belong to the first isolation device, transformer T1 and current protector F1 belong to the second isolation device, transformer T2 and current protector F2 belong to the third isolation device, and transformer T3 and current protector F3 belong to the fourth isolation device.

[0063] Alternatively, refer to Figure 5 The isolation component 03 may include 8 transformers from T0 to T7, and 4 current protectors from F0 to F3 ( Figure 4 Take fuse as an example for illustration). Each current protector is connected across two transformers. Transformers T0, T4 and current protector F0 belong to the first isolation device, transformers T1, T5 and current protector F1 belong to the second isolation device, transformers T2, T6 and current protector F2 belong to the third isolation device, and transformers T3, T7 and current protector F3 belong to the fourth isolation device.

[0064] It can be understood that one side of the isolation component 03 can be used to connect to the first chip in the power supply device 01, and the other side can be used to connect to the second chip in the powered device 02. Figure 4 and Figure 5One side of the isolation component 03 can be connected to the Ethernet electrical port of the power supply device 01 through an Ethernet twisted pair cable, and the other side can be connected to the Ethernet electrical port of the powered device 02 through an Ethernet twisted pair cable.

[0065] It can also be understood that one side and the other side of the isolation component 03 can be two sides that are not distinguished, that is, any one of the two sides of the isolation component 03 can be connected to the first chip or the second chip.

[0066] Optionally, the number of isolation devices included in the isolation component 03 can also be n times of 4, where n is an integer greater than 1, for example, n can be 48. Among them, every 4 isolation devices can be a group, and the group of isolation devices can be used to connect one powered device 02. Accordingly, n groups of isolation devices can connect n powered devices 02.

[0067] Or it can be understood that: the isolation component 03 may include n first ports and n second ports, that is, the isolation component 03 may be an n-port device. Each first port is connected to a winding on one side of a transformer in a group of isolation devices, and each first port can be connected to an Ethernet electrical port of the power supply device 01. Each second port is connected to the winding on the other two sides of the transformer in a group of isolation devices, and each second port can be connected to an Ethernet electrical port of a powered device 02.

[0068] The present application also provides a PoE system, such as Figure 4 and Figure 5 As shown, the PoE system may include a power supply device 01, a powered device 02, an Ethernet twisted pair, and an isolation component 03 as provided in the above embodiment. The power supply device 01 and the powered device 02 are connected via an Ethernet twisted pair, and the isolation component 03 is connected in series to the Ethernet twisted pair.

[0069] Optionally, continue to refer to Figure 4 and Figure 5 The Ethernet twisted pair may include 4 pairs of signal lines, namely line pair A to line pair D, and the isolation component 03 may include: 4 isolation devices corresponding to the 4 pairs of signal lines, wherein each isolation device may be connected in series to a corresponding pair of signal lines.

[0070] It is understandable that if Figure 4 and Figure 5 As shown, each pair of signal lines in the Ethernet twisted pair may be a pair of differential signal lines, for example, each pair of signal lines may include two copper wires.

[0071] It can also be understood that the PoE system may include multiple powered devices 02. Accordingly, the PoE system may also include multiple isolation components 03 corresponding to the multiple powered devices 02, and each isolation component 03 is connected in series between the power supply device 01 and a corresponding powered device 02. Alternatively, the isolation component 03 in the PoE system may include multiple groups of isolation devices corresponding to the multiple powered devices 02, and each group of isolation devices (for example, 4 isolation devices) may be connected in series between the power supply device 01 and a corresponding powered device 02.

[0072] The present application also provides a power supply device, such as Figure 6 As shown, the power supply device includes a power supply chip 100, a physical layer chip 200, an Ethernet electrical port 300, and an isolation component 400 as provided in the above embodiment. The power supply chip 100 and the physical layer chip 200 can be connected to the Ethernet electrical port 300 through the isolation component 400. The power supply chip 100 can also be called a PSE chip, which is used to realize power supply to the powered device; the physical layer chip 200 is used to perform data interaction with the physical layer chip in the powered device.

[0073] Alternatively, if Figure 6 As shown, the Ethernet electrical port 300 may include 4 pairs of pins, and the isolation component 400 may include: 4 isolation devices corresponding to the 4 pairs of pins, wherein each isolation device is connected to a corresponding pair of pins.

[0074] In the embodiment of the present application, by integrating the isolation component 400 inside the power supply device, effective protection of the power supply device can be achieved, and the structure of the PoE system can be effectively simplified to reduce the complexity of network layout.

[0075] It is understandable that if the power supply device includes multiple Ethernet electrical ports, the isolation component integrated in the power supply device may include multiple groups of isolation devices corresponding to the multiple Ethernet electrical ports, and each group of isolation devices (for example, 4 isolation devices) may be connected to a corresponding Ethernet electrical port. Alternatively, the power supply device may be integrated with multiple isolation components corresponding to the multiple Ethernet electrical ports, and each isolation component is connected to a corresponding Ethernet electrical port.

[0076] The present application embodiment also provides another PoE system, such as Figure 7 As shown, the PoE system may include a power supply device 01, a powered device 02 and an Ethernet twisted pair. The power supply device 01 and the powered device 02 are connected via an Ethernet twisted pair, and the power supply device 01 may be a power supply device with an integrated isolation component 400 as provided in the above embodiment.

[0077] refer to Figures 4 to 7It can be known that the isolation component provided in the embodiment of the present application can be an independent device or integrated into the interior of the power supply device 01.

[0078] The following is Figure 5 Taking the structure shown in the figure as an example, the workflow of the PoE system provided in the embodiment of the present application is introduced:

[0079] When pure data transmission is performed, data transmission can be performed through at least two of the transformers T0 to T7 in the isolation component 03, and the current protectors F0 to F3 in the isolation component 03 do not need to be operated. If leakage occurs on the Ethernet twisted pair, the current protectors F0 to F3 in the isolation component 03 can be turned off in time (for example, the fuse can be blown in time), thereby effectively preventing the leakage voltage or leakage current of any one or more of the four wire pairs of the Ethernet twisted pair from flowing back to the power supply device. In this way, not only the power supply device is protected, but also the normal data transmission function of the PoE system is not affected because the transformers T0 to T7 are not affected.

[0080] When data transmission and PoE power supply are performed, or when pure PoE power supply is performed, the voltage transmission function of the PoE system is performed through at least two of the current protectors F0 to F3 in the isolation component 03. That is, DC voltage or low-frequency AC power can be transmitted through at least two of the current protectors F0 to F3. If leakage occurs on the Ethernet twisted pair, the current protectors F0 to F3 in the isolation component 03 can be turned off in time (for example, the fuse can be blown in time), thereby effectively preventing the leakage voltage or leakage current from flowing back to the power supply device.

[0081] In summary, the embodiment of the present application provides a PoE system, the isolation component used in the PoE system can not only realize the transmission of data signals, but also realize the transmission of voltage signals, thereby ensuring that the PoE system can operate normally. In addition, when leakage occurs in the PoE system, the current protector in the isolation component can be turned off, thereby preventing the leakage voltage or leakage current from flowing back to the power supply device, thereby effectively reducing the probability of damage to the power supply device. It can be seen that the isolation component used in the PoE system realizes the safety protection of the power supply device, the receiving device and the user.

[0082] In addition, after the current protector in the isolation component is turned off, the transformer in the isolation component can still work normally, thereby ensuring that the data transmission function of the PoE system is not affected.

[0083] In the embodiments of the present application, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "at least one" means one or more, and "plurality" means two or more.

[0084] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0085] The above is only an optional implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An isolation device, characterized in that: Applicable to an Ethernet power supply system, the Ethernet power supply system includes a power supply device and a powered device; the isolation device includes: a current protector and at least one transformer; The at least one transformer is used to connect between a first chip of the power supply device and a second chip of the powered device, the first chip includes a power supply chip and a physical layer chip, and the second chip includes a powered chip and a physical layer chip; One end of the current protector is connected to a first center tap of the at least one transformer close to the first chip, and the other end of the current protector is connected to a second center tap of the at least one transformer close to the second chip; The current protector is used to disconnect the first center tap from the second center tap if the current flowing through the current protector is greater than a threshold.

2. The isolation device according to claim 1, characterized in that: The isolation device includes a transformer; The first side winding of the transformer is used to connect to the first chip, the second side winding of the transformer is used to connect to the second chip, the first center tap is the center tap of the first side winding, and the second center tap is the center tap of the second side winding.

3. The isolation device according to claim 1, characterized in that: The at least one transformer comprises: a first transformer and a second transformer; The first side winding of the first transformer is used to connect to the first chip, the first side winding of the second transformer is used to connect to the second chip, and the second side winding of the first transformer is connected to the second side winding of the second transformer; The first center tap is a center tap of a first side winding of the first transformer, and the second center tap is a center tap of a first side winding of the second transformer.

4. The isolation device according to claim 3, characterized in that: The current carrying capacity of the first side winding of the first transformer and the first side winding of the second transformer are both greater than or equal to the current threshold; The current carrying capacity of the second side winding of the first transformer and the current carrying capacity of the second side winding of the second transformer are both smaller than the current threshold.

5. The isolation device according to any one of claims 1 to 4, characterized in that: The current protector is a fuse, a current limiting chip or a thermistor.

6. The isolation device according to claim 5, characterized in that: The current protector is a fast-blow fuse.

7. An isolation assembly, characterized in that: The isolation assembly includes a plurality of isolation devices according to any one of claims 1 to 6.

8. The isolation assembly according to claim 7, characterized in that The isolation component includes four isolation devices.

9. A power supply device, characterized in that: The power supply device comprises: a power supply chip, a physical layer chip, an Ethernet electrical port, and an isolation component as claimed in claim 7 or 8; The power supply chip and the physical layer chip are connected to the Ethernet electrical port through the isolation component.

10. The power supply device according to claim 9, characterized in that: The Ethernet electrical port includes 4 pairs of pins, and the isolation component includes: 4 isolation devices corresponding to the 4 pairs of pins one by one; Wherein, each of the isolation devices is connected to a corresponding pair of pins.

11. An Ethernet power supply system, characterized in that: The Ethernet power supply system includes: a power supply device, a powered device, and an Ethernet twisted pair cable; The power supply device is the power supply device according to claim 9 or 10, and the power supply device is connected to the powered device via the Ethernet twisted pair cable.

12. An Ethernet power supply system, characterized in that: The Ethernet power supply system comprises: a power supply device, a powered device, an Ethernet twisted pair, and an isolation component as claimed in claim 7 or 8; The power supply device and the powered device are connected via the Ethernet twisted pair cable, and the isolation component is connected in series to the Ethernet twisted pair cable.

13. The Ethernet power supply system according to claim 12, characterized in that: The Ethernet twisted pair cable includes 4 pairs of signal lines, and the isolation component includes: 4 isolation devices corresponding to the 4 pairs of signal lines one by one; Wherein, each of the isolation devices is connected in series to a corresponding pair of signal lines.

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