Bandpass detection device, power supply device and system

Abstract

This application discloses a filtered detection device for use in a power supply equipment (PSE). The filtered detection device includes a power supply control circuit and an adaptive filtering circuit. The power supply control circuit includes a power supply channel and a detection module. The power supply channel includes a control switch for controlling the opening and closing of the power supply channel. The detection module sends a detection signal to the power supply channel to detect whether the peer device connected to the power supply channel is a valid powered device. The control switch is turned off during the detection process of the power supply channel. The adaptive filtering circuit filters noise in the detection signal during the detection process of the power supply channel. This solves the problem in the PSE where noise from the power supply affects the accuracy of the detection results, causing valid powered devices to fail to power on properly.

Description

Technical Field

[0001] This invention relates to the field of communications, and more particularly to a filter detection device, power supply equipment, and system. Background Technology

[0002] Power over Ethernet (PoE) is a technology that uses Ethernet twisted-pair cables to simultaneously transmit Ethernet data and power. Power refers to the electricity supplied. The PoE standard published by the Institute of Electrical and Electronics Engineers (IEEE) defines PoE devices as power sourcing equipment (PSE) and powered devices (PD). The PSE communicates with the PD via the Ethernet twisted-pair cable and provides power to the PD. The PSE is the device that provides power. The PD is the device that draws power.

[0003] Ethernet twisted-pair cable, also known as Ethernet cable, typically consists of 8 wires. Wires 1 and 2 are paired, called pair 1-2. Wires 3 and 6 are paired, called pair 3-6. Wires 4 and 5 are paired, called pair 4-5. Wires 7 and 8 are paired, called pair 7-8. The two wires in each pair are twisted together. Widely used 100Mbps Ethernet cables utilize pairs 1-2 and 3-6 for communication, while pairs 4-5 and 7-8 remain idle.

[0004] Initially, Power over Ethernet (PoE) typically used two wire pairs, such as 1-2 and 3-6, to provide up to 30 watts (W) of power. With the development of PoE technology, newer high-power PoE technologies utilize all four wire pairs simultaneously, providing up to 90W of power.

[0005] Due to its ease of use, PoE technology is being applied more and more widely, and in increasingly complex scenarios. Some applications are indoors, such as in server rooms, low-voltage wiring shafts, and corridors, while others are outdoors, on building exteriors. However, many scenarios cannot guarantee proper grounding of the PSE. If the PSE is poorly grounded, and the PD's impedance to ground is less than the PSE's impedance to ground, common-mode interference signals on the PSE will be transmitted to the PD via the Ethernet twisted-pair cable for discharge, affecting the PSE's detection of the PD, causing detection failure, and preventing the PD from powering on (the PSE does not supply power to the PD). The common-mode interference signal on the PSE is noise from the power supply when the PSE is connected to the power grid; it is also called power supply noise or common-mode noise. Summary of the Invention

[0006] This application provides a detection device with filtering, a power supply equipment, and a power supply system. By setting a filter in the power supply equipment to filter noise from the power supply, the problem of noise from the power supply in the PSE being transmitted to the PD through the twisted pair for discharge, causing the PSE to fail to detect the PD and the PD to fail to power on, can be solved.

[0007] In a first aspect, a filtered detection device is provided for use in a power supply detection (PSE). The filtered detection device includes a power supply control circuit and an adaptive filtering circuit. The power supply control circuit includes a first power supply channel and a first detection module. The first power supply channel includes a first control switch for controlling the opening and closing of the first power supply channel. The first detection module sends a first detection signal to the first power supply channel to detect whether the peer device connected to the first power supply channel is a valid power receiving device. During the detection process of the first power supply channel, the first control switch disconnects the first input terminal of the adaptive filtering circuit from the first detection module, and the first output terminal of the adaptive filtering circuit is connected to the output terminal of the first power supply channel.

[0008] The adaptive filtering circuit is used to filter noise in the first detection signal during the detection process of the first power supply channel.

[0009] In conjunction with the first aspect, in a first possible implementation of the first aspect, the adaptive filtering circuit includes a first filter; the first filter is connected in series between a first input terminal and a first output terminal of the adaptive filtering circuit;

[0010] The first filter is used to filter noise in the first detection signal during the detection process, and the first filter is connected to the first detection module.

[0011] In conjunction with the first possible implementation of the first aspect, in a second possible implementation of the first aspect, the adaptive filtering circuit further includes a first selection switch; the first selection switch corresponds to the first power supply channel;

[0012] The first terminal of the first selection switch is connected to the first input terminal of the adaptive filter circuit, the second terminal of the first selection switch is connected to the first filter, and the third terminal of the first selection switch is connected to the first output terminal of the adaptive filter circuit. Taking a single-pole double-throw switch as an example, the extreme terminal of the first selection switch is connected to the first input terminal of the adaptive filter circuit, the first throwing terminal of the first selection switch is connected to one end of the first filter, the second throwing terminal of the first selection switch is connected to the first output terminal of the adaptive filter circuit, and the other end of the first filter is connected to the first output terminal of the adaptive filter circuit.

[0013] The first selection switch is used to connect the first terminal and the second terminal (extreme and first switching terminal) according to the first control command, thereby connecting the first input terminal of the adaptive filter circuit, the first filter and the first output terminal of the adaptive filter circuit, so that the first filter filters the noise in the first detection signal;

[0014] The first selection switch is also used to connect the first terminal and the third terminal (extreme and second switching terminals) according to the second control command, so that the first input terminal of the adaptive filter circuit is directly connected to the first output terminal of the adaptive filter circuit, thereby bypassing the filter to filter the noise in the first detection signal.

[0015] In a third possible implementation of the first aspect, in conjunction with the second possible implementation of the first aspect, the power supply control circuit further includes a controller; the controller is configured to send the first control command or the second control command to the first selection switch. In a fourth possible implementation of the first aspect, in conjunction with the first aspect and the first to third possible implementations of the first aspect, the adaptive filtering circuit may be located before the first detection module, after the first detection module, or within the first detection module; specifically, the first input terminal of the adaptive filtering circuit is connected to the output terminal of the first detection module, and the first output terminal of the adaptive filtering circuit is connected to the output terminal of the first power supply channel.

[0016] Alternatively, the first input terminal of the adaptive filter circuit is connected to the power supply, and the first output terminal of the adaptive filter circuit is connected to the input terminal of the first detection module.

[0017] Alternatively, the adaptive filtering circuit may be located in the first detection module, i.e., the first filter, or the first filter and the first selection switch may be configured in the first detection module.

[0018] In conjunction with the first aspect, in a fifth possible implementation of the first aspect, the power supply control circuit further includes a second power supply channel and a second detection module;

[0019] The second power supply channel includes a second control switch, which is used to control the opening and closing of the second power supply channel;

[0020] The second detection module is used to send a second detection signal to the second power supply channel to detect whether the peer device connected to the second power supply channel is a valid power receiving device; the second control switch is disconnected during the detection process of the second power supply channel;

[0021] The adaptive filtering circuit is also used to filter noise in the second detection signal during the detection process of the second power supply channel.

[0022] In conjunction with the fifth possible implementation of the first aspect, in the sixth possible implementation of the first aspect, the adaptive filtering circuit includes a first filter and a second filter, wherein the first filter corresponds to the first power supply channel and the second filter corresponds to the second power supply channel;

[0023] The first filter is connected in series between the first input terminal and the first output terminal of the adaptive filter circuit; the second filter is connected in series between the second input terminal and the second output terminal of the adaptive filter circuit.

[0024] The first filter is used to filter noise in the first detection signal during the detection process of the first power supply channel;

[0025] The second filter is used to filter noise in the second detection signal during the detection process of the second power supply channel.

[0026] In this possible implementation, the first filter can be placed between the first detection module and the output terminal of the first power supply channel, or it can be placed in the first detection module; the second filter can be placed between the second detection module and the output terminal of the second power supply channel, or it can be placed in the second detection module.

[0027] In conjunction with the fifth possible implementation of the first aspect, in the sixth possible implementation of the first aspect, the adaptive filter circuit further includes a first selection switch and a second selection switch, wherein the first selection switch corresponds to the first power supply channel and the second selection switch corresponds to the second power supply channel;

[0028] The first terminal of the first selection switch is connected to the first input terminal of the adaptive filter circuit, the second terminal of the first selection switch is connected to the first filter, and the third terminal of the first selection switch is connected to the first output terminal of the adaptive filter circuit. Taking a single-pole double-throw switch as an example, the extreme terminal of the first selection switch is connected to the first input terminal of the adaptive filter circuit, the first throwing terminal of the first selection switch is connected to one end of the first filter, the second throwing terminal of the first selection switch is connected to the first output terminal of the adaptive filter circuit, and the other end of the first filter is connected to the first output terminal of the adaptive filter circuit.

[0029] The first end of the second selection switch is connected to the second input terminal of the adaptive filter circuit, the second end of the second selection switch is connected to the second filter, and the third end of the second selection switch is connected to the second output terminal of the adaptive filter circuit. Taking a single-pole double-throw switch as an example, the extreme end of the second selection switch is connected to the second input terminal of the adaptive filter circuit, the first throwing end of the second selection switch is connected to one end of the second filter, the second throwing end of the second selection switch is connected to the second output terminal of the adaptive filter circuit, and the other end of the second filter is connected to the second output terminal of the adaptive filter circuit.

[0030] The first selection switch is configured to connect the first and second terminals of the first selection switch according to a first control command, thereby connecting the first input terminal of the adaptive filter circuit, the first filter, and the first output terminal of the adaptive filter circuit, so that noise in the first detection signal is filtered by the first filter; it is also configured to connect the first and third terminals of the first selection switch according to a second control command, so that the first input terminal of the adaptive filter circuit is directly connected to the first output terminal of the adaptive filter circuit, thereby eliminating the need to use the first filter to filter noise.

[0031] The second selection switch is used to connect the first and second terminals of the second selection switch according to the first control command, thereby connecting the second input terminal of the adaptive filter circuit, the second filter, and the second output terminal of the adaptive filter circuit, so as to filter noise in the second detection signal through the second filter; it is also used to connect the first and third terminals of the second selection switch according to the second control command, so that the second input terminal of the adaptive filter circuit is directly connected to the second output terminal of the adaptive filter circuit, thereby eliminating the need to use the first and second filters to filter noise.

[0032] In conjunction with the fifth possible implementation of the first aspect, in the eighth possible implementation of the first aspect, the adaptive filtering circuit includes a common filter and a common selection switch;

[0033] The first input terminal of the adaptive filter circuit is connected to the output terminal of the first detection module, and the first output terminal of the adaptive filter circuit is connected to the output terminal of the first power supply channel; the second input terminal of the adaptive filter circuit is connected to the output terminal of the second detection module, and the second output terminal of the adaptive filter circuit is connected to the output terminal of the second power supply channel.

[0034] The common filter and the common selection switch are connected in series between the input and output terminals of the adaptive filter circuit. Specifically, the first terminal of the common selection switch is connected to the first terminal of the common filter, and the second terminal of the common selection switch is connected to the second terminal of the common filter; the first input terminal of the common selection switch is connected to the first input terminal of the adaptive filter circuit, and the second input terminal of the common selection switch is connected to the second input terminal of the adaptive filter circuit; the third input terminal of the common selection switch is connected to the first output terminal of the adaptive filter circuit; and the fourth input terminal of the common selection switch is connected to the second output terminal of the adaptive filter circuit.

[0035] The common selection switch is used to connect the first terminal and the first input terminal, and the second terminal and the third input terminal according to the first selection instruction, thereby connecting the output terminals of the first detection module, the common filter and the first power supply channel, so as to filter the noise in the first detection signal through the common filter;

[0036] The common selection switch is also used to connect the first terminal and the second terminal, and the second terminal and the fourth terminal, according to the second selection instruction, thereby connecting the output terminals of the second detection module, the common filter and the second power supply channel, so as to filter the noise in the second detection signal through the common filter.

[0037] In conjunction with the eighth possible implementation of the first aspect, in the ninth possible implementation of the first aspect, the power supply control circuit further includes a controller; the controller is configured to send the first selection instruction and the second selection instruction to the common selection switch.

[0038] In a second aspect, a power supply device (PSE) is provided, including at least one port, and a band-filtered detection device as described in any of the first aspects and their implementations, the band-filtered detection device being used to detect the at least one port.

[0039] Thirdly, a power supply system is provided, including a power receiving device and a power supply device, the power supply device including a filtered detection device as described in any of the first aspects and their implementations. The power receiving device is connected to the power supply device via a twisted-pair cable.

[0040] Fourthly, a chip is provided, including programmable logic circuitry and / or instructions, which, when the chip is running, implement the filtered detection device as described in any of the first aspects and their implementations. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of a detection device with filtering provided in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of a power supply device (PSE) provided in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of another filtering detection device provided in an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of another filtering detection device provided in an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of another filtering detection device provided in an embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of another filtering detection device provided in an embodiment of the present invention;

[0047] Figure 7 This is a schematic diagram of another filtering detection device provided in an embodiment of the present invention;

[0048] Figure 8 This is a schematic diagram of another filtering detection device provided in an embodiment of the present invention;

[0049] Figure 9 This is a schematic diagram of the power supply system provided in an embodiment of the present invention. Detailed Implementation

[0050] The technical solution provided by the present invention will be described below with reference to the accompanying drawings and specific embodiments.

[0051] Before supplying power to an Ethernet port, the Power Supply Equipment (PSE) first performs a detection process to determine if the connected device is a valid Power Device (PD). Specifically, the PSE sends a detection signal along the twisted pair cable to the peer device, measuring its impedance. Based on the measured impedance, it determines whether the peer device is a valid PD. If the measured impedance is within the impedance range of a valid PD, the peer device is considered a PD, and the PSE supplies power to it. If the measured impedance is outside the impedance range of a valid PD, the peer device is not considered a PD, and the PSE does not supply power.

[0052] The detection signal is divided into voltage type and current type. Voltage type is a constant voltage source; the detection signal sent along the twisted pair to the other end device is the detection voltage. Current type is a constant current source; the detection signal sent along the twisted pair to the other end device is the detection current. However, regardless of whether the detection signal is voltage or current type, it contains noise from the power supply. In scenarios with poor PSE grounding, if the PD's impedance to ground is less than the PSE's impedance to ground, the noise from the power supply in the detection signal will be transmitted to the PD through the twisted pair for discharge. This causes the impedance detected by the PSE to be outside the impedance range of the effective powered device, preventing the PD from powering on properly.

[0053] To address this issue, the present invention provides a filtered detection device for use in a power supply equipment (PSE). The filtered detection device includes a power supply control circuit and an adaptive filtering circuit. The power supply control circuit includes N power supply channels and N detection modules corresponding one-to-one with each of the N power supply channels; where N is a positive integer. Each power supply channel includes a control switch for controlling the on / off state of the channel. The adaptive filtering circuit filters noise from the detection signals generated by each detection module during the detection process. During the detection process, the control switch in each power supply channel is in the off state. If the detection determines that a power supply channel is connected to a valid power PD, the control switch of that power supply channel is closed to turn on the channel and supply power to the connected valid power PD. The filtered detection device provided by the present invention eliminates the influence of noise in the detection signal by adding a filtering circuit to the PSE, thereby solving the problem of detection errors caused by poor PSE grounding, which prevents the PD from powering on normally.

[0054] In traditional power supply control circuits, the input terminal of the detection module is directly connected to the power supply, specifically to the power conversion module; the output terminal of the detection module is directly connected to the output terminal of the power supply channel, i.e., the power supply port. The power conversion module is used to convert the power supply (e.g., -48V) into a constant current or constant voltage source required by the detection module. In this embodiment of the invention, the adaptive filter circuit added to the filtered detection device can be placed before, after, or within the detection module. Specifically, the adaptive filter circuit can be placed between the output terminal of the detection module and the output terminal of the power supply channel (i.e., the power supply port). Alternatively, the adaptive filter circuit can be placed between the power supply (specifically, the power conversion module) and the detection module. Alternatively, the adaptive filter circuit can be placed within the detection module, and the detection signal is filtered for noise before being sent to the power supply port.

[0055] See Figure 1 This is a schematic diagram of a filtering detection device provided in an embodiment of the present invention. Figure 1 As shown, the filtered detection device 100 includes a power supply control circuit 101 and an adaptive filter circuit 102.

[0056] The power supply control circuit 101 includes a controller 1011, N power supply channels (1012-1 to 1012-N), and N detection modules, where N is a positive integer. Each power supply channel includes a control switch for turning the power supply channel to or from being turned off. Each power supply channel is assigned a corresponding detection module.

[0057] Each detection module is used to send a detection signal to the corresponding power supply channel to detect whether the peer device connected to that power supply channel is a valid power receiving device.

[0058] The adaptive filter circuit 102 includes N input terminals (1021-1 to 1021-N) and N output terminals (1022-1 to 1022-N). The adaptive filter circuit 102 is used to filter noise in the detection signal during the detection process. A control switch in one power supply channel is in the off state during the detection process of that power supply channel.

[0059] The N input terminals (1021-1 to 1021-N) of the adaptive filter circuit 102 are respectively connected to the output terminals of the detection modules of the N power supply channels (1012-1 to 1012-N), and the N output terminals (1022-1 to 1022-N) of the adaptive filter circuit 102 are respectively connected to the output terminals of the N power supply channels (1012-1 to 1012-N).

[0060] For example, Figure 1 In the diagram, 1021-1 connects to detection module D1 of 1012-1, 1021-2 connects to detection module D2 of 1012-2, ..., 1021-N connects to detection module DN of 1012-N. 1022-1 connects to the output of 1012-1, 1022-2 connects to the output of 1012-2, ..., 1022-N connects to the output of 1012-N.

[0061] Each detection module's input is connected to a power conversion module, which converts the power supply (e.g., -48V) into a constant current or constant voltage source required by the detection module. The power conversion module can be implemented using a DC-to-DC converter (often denoted as DC / DC). Alternatively, it can be implemented using a low dropout regulator (LDO). In practice, only one power conversion module can be used for all detection modules, or multiple power conversion modules can be used; this invention does not limit this. Figure 1 Taking the example of setting up a power conversion module for each detection module.

[0062] In one possible implementation, the power supply control circuit 101 is implemented by a PSE chip.

[0063] In another possible implementation, the power supply control circuit 101 includes a PSE chip and N control switches. The number of control switches corresponds to the number of power supply channels in the PSE chip. Each power supply channel corresponds to one control switch, for example... Figure 1 As shown, power supply channel 1012-1 corresponds to control switch G1, power supply channel 1012-2 corresponds to control switch G2, ..., power supply channel 1012-N corresponds to control switch GN. The PSE chip outputs control signals to control the on or off of each control switch.

[0064] The control switch can be implemented using a relay, optocoupler, metal-oxide-semiconductor field-effect transistor (MOSFET), or transistor. The control switch is turned on or off according to the control signal output by the controller 1011.

[0065] When N is 1, the above PSE chip is usually called a single-channel PSE chip. When N is greater than 1, the above PSE chip is usually called a multi-channel PSE chip.

[0066] like Figure 2 As shown, the filter detection device 100 can be installed in the PSE 10.

[0067] Corresponding to an Ethernet cable, an Ethernet port typically includes eight contacts, numbered 1-8, used to connect to wires 1-8 of the Ethernet cable. Contacts 1 and 2 form a pair, called contact pair 1-2, used to connect to wire pairs 1-2 of the Ethernet cable. Contacts 3 and 6 form a pair, called contact pair 3-6, used to connect to wire pairs 3-6 of the Ethernet cable. Contacts 4 and 5 form a pair, called contact pair 4-5, used to connect to wire pairs 4-5 of the Ethernet cable. Contacts 7 and 8 form a pair, called contact pair 7-8, used to connect to wire pairs 7-8 of the Ethernet cable. The Ethernet port is divided into two contact groups: the first contact group includes contact pairs 1-2 and 3-6, and the second contact group includes contact pairs 4-5 and 7-8.

[0068] The PoE standard defines two power supply schemes: Alternative A and Alternative B. Alternative A uses wire pairs 1-2 and 3-6 for power supply, i.e., it uses the first contact group of the Ethernet port. Alternative B uses wire pairs 4-5 and 7-8 for power supply, i.e., it uses the second contact group of the Ethernet port. When the power supply filtering device provided in this embodiment is used in a two-pair power supply scenario, if the first contact group of the Ethernet port is used for power supply (Alternative A), then the first contact group is referred to as the power supply contact group; if the second contact group of the Ethernet port is used for power supply (Alternative B), then the second contact group is referred to as the power supply contact group. When the power supply filtering device provided in this embodiment is used in a four-pair power supply scenario, i.e., it uses both the first and second contact groups of the Ethernet port for power supply, then both the first and second contact groups of the Ethernet port are referred to as the power supply contact groups.

[0069] PSE 10 may include N power supply contact groups corresponding to the band-filtered detection device 100. The output terminals of the N power supply channels in the band-filtered detection device 100 are respectively connected to these N power supply contact groups. Of course, PSE 10 may also include more or less than N power supply contact groups. When there are fewer than N power supply contact groups, some power supply channels of the band-filtered detection device 100 are idle; when there are more than N power supply contact groups, PSE 10 may also include other power supply devices.

[0070] The PSE10 includes a first Ethernet port connected to the filtered detection device 100.

[0071] When N is 1, if one power supply channel of the filter detection device 100 is connected to the first contact group of the first Ethernet port, then the first contact group is a power supply contact group; or, if it is connected to the second contact group of the first Ethernet port, then the second contact group is a power supply contact group.

[0072] When N is 2, the two power supply channels of the filtered detection device 100 can be connected to the first contact group and the second contact group of the first Ethernet port, then both the first contact group and the second contact group of the first Ethernet port are power supply contact groups; or, the PSE 10 further includes the second Ethernet port. The two power supply channels of the filtered detection device 100 can have one power supply channel connected to the first contact group of the first Ethernet port and the other power supply channel connected to the first contact group of the second Ethernet port. Alternatively, the two power supply channels of the filtered detection device 100 can have one power supply channel connected to the second contact group of the first Ethernet port and the other power supply channel connected to the second contact group of the second Ethernet port.

[0073] When N is greater than 2, it can be implemented using any combination of the various implementations described above for N=1 and N=2. For example, when N is 4, the filtered detection device 100 includes 4 power supply channels. Assume the filtered detection device 100 is connected to 4 Ethernet ports, with each power supply channel connected to either the first contact group of an Ethernet port or the second contact group of an Ethernet port, thus achieving two pairs of wires powered. Alternatively, assume the filtered detection device 100 is connected to 2 Ethernet ports, with each Ethernet port connected to 2 power supply channels, thus achieving four pairs of wires powered. Or, assume the filtered detection device 100 is connected to 3 Ethernet ports, where power supply channel 1 connects to the first contact group of the first Ethernet port, power supply channel 2 connects to the first contact group of the second Ethernet port, and power supply channels 3 and 4 connect to the first and second contact groups of the third Ethernet port, respectively.

[0074] Each power supply channel may also include an overload current monitoring module. Figure 1 and Figure 2 (Not shown in the image) This is used to monitor whether the current in this power supply channel exceeds the maximum power supply current specified in the standard during the power supply process. During the power supply process, the control switch in this power supply channel is closed.

[0075] The PSE10 in this embodiment of the invention only shows modules or devices related to the invention. It can be understood that the PSE10 may also include other devices, such as processors, memory, physical layer (PHY) chips, other hardware chips, etc.

[0076] Below Figure 1 and 2 Based on the illustrated filtered detection device, the possible implementations of the filtered detection device are explained in detail. Please refer to [link to relevant documentation] for details. Figures 3-5 The filter detection device shown is shown.

[0077] See Figure 3 This is a schematic diagram of another filtering detection device provided in an embodiment of the present invention. Figure 3 As shown, the filtered detection device 200 includes a power supply control circuit 201 and an adaptive filter circuit 202. The power supply control circuit 201 includes a controller 2011, a first power supply channel 2012-1 and a second power supply channel 2012-2, a detection module D1, and a detection module D2. The first power supply channel 2012-1 includes an overload current detection module S1 and a control switch MOSFET1, and the second power supply channel 2012-2 includes an overload current detection module S2 and a control switch MOSFET2. Figure 3The control switch implemented using a MOSFET is used as an example and is not intended to limit the control switch in this invention.

[0078] The detection module D1 is used to send a first detection signal to the first power supply channel 2012-1 during the detection phase to detect whether the peer device connected to the first power supply channel 2012-1 is a valid PD. The control switch MOSFET1 is turned off during the detection phase.

[0079] The detection module D2 is used to send a second detection signal to the second power supply channel 2012-2 during the detection phase to detect whether the peer device connected to the second power supply channel 2012-2 is a valid PD. The control switch MOSFET2 is turned off during the detection phase.

[0080] like Figure 3 As shown, the adaptive filter circuit 202 includes two input terminals (2021-1 and 2021-2) and two output terminals (2022-1 and 2022-2). Input terminal 2021-1 of the adaptive filter circuit 202 is connected to the output terminal of detection module D1, and input terminal 2021-2 of the adaptive filter circuit 202 is connected to the output terminal of detection module D2. Output terminal 2022-1 of the adaptive filter circuit 202 is connected to the output terminal of the first power supply channel 2012-1, and output terminal 2022-2 of the adaptive filter circuit 202 is connected to the output terminal of the second power supply channel 2012-2.

[0081] The adaptive filter circuit 202 includes two filters, filter F1 and filter F2. Filter F1 is connected in series between the input terminal 2021-1 and the output terminal 2022-1 of the adaptive filter circuit 202. Specifically, the first terminal f11 of filter F1 is connected to the input terminal 2021-1 of the adaptive filter circuit 202, and the second terminal f12 of filter F1 is connected to the output terminal 2022-1 of the adaptive filter circuit 202. Filter F2 is connected in series between the input terminal 2021-2 and the output terminal 2022-2 of the adaptive filter circuit 202. Specifically, the first terminal f21 of filter F2 is connected to the input terminal 2021-2 of the adaptive filter circuit 202, and the second terminal f22 of filter F2 is connected to the output terminal 2022-2 of the adaptive filter circuit 202.

[0082] Figure 3 In the filtered detection device 200 shown, a filter is configured for each power supply channel. The filter is connected in series between the detection module and the output terminal of the power supply channel to filter noise in the detection signal on the power supply channel during the detection process, ensuring the accuracy of the detection results.

[0083] Optionally, it is also possible to freely choose whether to use a filter to filter noise in the detection signal on the power supply channel. See Figure 4As shown, the adaptive filter circuit 202 also includes two selection switches, namely a first selection switch SW1 and a second selection switch SW2. The first selection switch SW1 and the second selection switch SW2 are single-pole double-throw switches, which can be implemented by metal-oxide-semiconductor field-effect transistors (MOSFETs), relays, optocouplers, transistors, etc. Figure 4 This is only a schematic diagram of the first selector switch SW1 and the second selector switch SW2.

[0084] The first selector switch SW1's extreme P1 is connected to the input terminal 2021-1 of the adaptive filter circuit 202 (i.e., connected to the output terminal of the detection module D1). The first input terminal T11 of the first selector switch SW1 is connected to the first terminal f11 of the filter F1. The second input terminal T12 of the first selector switch SW1 is connected to the output terminal 2022-1 of the adaptive filter circuit 202. The second terminal f12 of the filter F1 is connected to the output terminal 2022-1 of the adaptive filter circuit 202. The second selector switch SW2's extreme P2 is connected to the input terminal 2021-2 of the adaptive filter circuit 202 (i.e., connected to the output terminal of the detection module D2). The first input terminal T21 of the second selector switch SW2 is connected to the first terminal f21 of the filter F2. The second input terminal T22 of the second selector switch SW2 is connected to the output terminal 2022-2 of the adaptive filter circuit 202. The second terminal f22 of the filter F2 is connected to the output terminal 2022-2 of the adaptive filter circuit 202.

[0085] If the first selection switch SW1's extreme P1 is connected to the first input terminal T11, it indicates that filter F1 is used to filter the common-mode noise (noise in the first detection signal) of the first power supply channel 2012-1 during the detection process. If the first selection switch SW1's extreme P1 is connected to the second input terminal T12, it indicates that filter F1 is not used during the detection process of the first power supply channel 2012-1. Specifically, the first selection switch SW1 connects the detection module D1 and filter F1 according to the first control command issued by the controller 2011, so that the filter F1 filters the common-mode noise (noise in the first detection signal) of the first power supply channel during the detection process; or, the first selection switch SW1 connects the detection module D1 and the output terminal of the first power supply channel according to the second control command issued by the controller 2011.

[0086] If the extreme P2 of the second selection switch SW2 is connected to the first input terminal T21, it indicates that filter F2 is used to filter noise in the second detection signal during the detection process of the second power supply channel 2012-2. If the extreme P2 of the second selection switch SW2 is connected to the second input terminal T22, it indicates that filter F2 is not used during the detection process of the second power supply channel 2012-2. Specifically, the second selection switch SW2 connects the detection module D2 and filter F2 according to the first control command issued by the controller 2011, so as to filter the common-mode noise (noise in the second detection signal) of the second power supply channel during the detection process through the filter F2; or, the second selection switch SW2 connects the detection module D2 and the output terminal of the first power supply channel according to the second control command issued by the controller 2011.

[0087] Figure 4 In the filtered detection device 200 shown, a filter is configured for each power supply channel. However, by controlling the selector switch, it is possible to choose whether to use the filter to filter the common-mode interference signal on the power supply channel or not. Specifically, the switch can be controlled according to customer needs, application scenarios, or the actual environment in which the filtered detection device 200 is set.

[0088] Figure 3 and Figure 4 Taking the filtered detection device 200 with two power supply channels as an example, in a specific implementation, the filtered detection device 200 may include N power supply channels, where N≥1. Correspondingly, the adaptive filtering circuit includes N filters. If a selection switch is also provided, then it includes N selection switches.

[0089] See Figure 5 This is a schematic diagram of another filtering detection device provided in an embodiment of the present invention. Figure 5 As shown, the filtered detection device 400 includes a power supply control circuit 401 and an adaptive filter circuit 402. The power supply control circuit 401 includes a controller 4011, a first power supply channel 4012-1, a second power supply channel 4012-2, a detection module D1, and a detection module D2. The first power supply channel 4012-1 includes an overload current detection module S1 and a control switch G1, and the second power supply channel 4012-2 includes an overload current detection module S2 and a control switch G2.

[0090] The detection module D1 is used to send a first detection signal to the first power supply channel 2012-1 during the detection phase to detect whether the peer device connected to the first power supply channel 2012-1 is a valid PD. The control switch G1 is turned off during the detection phase.

[0091] Detection module D2 is used to send a second detection signal to the second power supply channel 2012-2 during the detection phase to detect whether the peer device connected to the second power supply channel 2012-2 is a valid PD. Control switch G2 is turned off during the detection phase.

[0092] like Figure 5 As shown, the adaptive filter circuit 402 includes two input terminals (4021-1 and 4021-2) and two output terminals (4022-1 and 4022-2). Input terminal 4021-1 of the adaptive filter circuit 402 is connected to the output terminal of detection module D1, and input terminal 4021-2 of the adaptive filter circuit 402 is connected to the output terminal of detection module D2. Output terminal 4022-1 of the adaptive filter circuit 402 is connected to the output terminal of the first power supply channel 4012-1, and output terminal 4022-2 is connected to the output terminal of the second power supply channel 4012-2.

[0093] The adaptive filter circuit 402 includes a common filter and a common selection switch. For example... Figure 5 As shown, the common filter is filter F, and the common selection switch is implemented by the first selection switch SW1 and the second selection switch SW2. The first selection switch SW1, filter F, and second selection switch SW2 are connected in series between the input and output terminals of the adaptive filter circuit 402.

[0094] Figure 5 The first selector switch SW1 and the second selector switch SW2 shown are for illustrative purposes only. Both the first selector switch SW1 and the second selector switch SW2 are single-pole double-throw switches. The first selector switch SW1 and the second selector switch SW2 are controlled according to a unified rule, that is, the first selector switch SW1 and the second selector switch SW2 are two linked single-pole double-throw switches. Therefore, the first selector switch SW1 and the second selector switch SW2 can also be understood as a double-pole double-throw switch. The double-pole double-throw switch can also be implemented using MOSFETs, relays, optocouplers, transistors, etc.

[0095] like Figure 5 As shown, the first terminal f1 of filter F is connected to the extreme P1 of the first selection switch SW1, and the second terminal f2 of filter F is connected to the extreme P2 of the second selection switch SW2. The two input terminals T11 and T21 of the first selection switch SW1 are connected to the input terminals 4021-1 and 4021-2 of the adaptive filter circuit 402, respectively. The two input terminals T21 and T22 of the second selection switch SW2 are connected to the output terminals 4022-1 and 4022-2 of the adaptive filter circuit 402, respectively.

[0096] See Figure 5When P1 is connected to T11 (i.e., the first end f1 of filter F is connected to the output of detection module D1), it will trigger P2 to connect to T21 (i.e., the second end f2 of filter F is connected to the output of the first power supply channel 4012-1), so that detection module D1 is connected to the first power supply channel 4012-1 through filter F, thereby filtering common-mode noise (noise in the first detection signal) on the first power supply channel 4012-1 through filter F. When P1 is connected to T12 (i.e., the first end f1 of filter F is connected to the output of detection module D2), it will trigger P2 to connect to T22 (i.e., the second end f2 of filter F is connected to the output of the second power supply channel 4012-2), so that detection module D2 is connected to the second power supply channel 4012-2 through filter F, thereby filtering common-mode noise (noise in the second detection signal) on the second power supply channel 4012-2 through filter F.

[0097] The common selection switches (first selection switch SW1 and second selection switch SW2) can connect the output terminals of detection module D1, filter F and first power supply channel 4012-1 according to the first selection command issued by controller 4011, so that the detection module D1 filters the common mode noise of the first power supply channel 4012-1 through filter F during the detection process; after the first power supply channel 4012-1 completes the detection, controller 4011 issues a second selection command to the common selection switches (first selection switch SW1 and second selection switch SW2), so that the first selection switch SW1 and second selection switch SW2 connect the output terminals of detection module D2, filter F and second power supply channel 4012-2, so that the detection module D2 filters the common mode noise of the second power supply channel 4012-2 through filter F during the detection process.

[0098] Figure 5 The filter detection device 400 shown takes two power supply channels sharing one filter as an example. In a specific implementation, it can be N power supply channels sharing one filter, where N≥2. Correspondingly, the first selection switch SW1 and the second selection switch SW2 are single-pole multi-throw switches. The number of terminals of both the first selection switch SW1 and the second selection switch SW2 is consistent with the number of filters, i.e., both the first selection switch SW1 and the second selection switch SW2 have N power supply channels sequentially connected under the instruction of the controller, and the common-mode noise on the power supply channels is filtered sequentially through the filter F during the detection process.

[0099] Figure 5 In the filtered detection device 400 shown, multiple power supply channels share a single filter. By controlling a switch, the filter is switched between the multiple power supply channels to filter common-mode interference signals on the power supply channels. For example, Figure 5In the process of detecting the first power supply channel 4012-1, the first selection switch SW1 and the second selection switch SW2 are controlled to connect the detection module D1 and the first power supply channel 4012-1 through the filter F, thereby filtering the noise in the first detection signal through the filter F; when detecting the second power supply channel 4012-2, the first selection switch SW1 and the second selection switch SW2 are controlled to connect the detection module D2 and the second power supply channel 4012-2 through the filter F, thereby filtering the noise in the second detection signal through the filter F. Figure 5 In the filter-equipped detection device 400 shown, multiple power supply channels can share a single filter, which can reduce costs.

[0100] certainly, Figure 5 The filter detection device 400 shown can also be further designed with a selection switch to select whether to use the filter or not to filter the detection signal.

[0101] The above Figures 1-5 In the filter-equipped detection device shown, the adaptive filter circuit is located between the detection module and the power supply port.

[0102] See Figure 6 This is a schematic diagram of another filtering detection device provided in an embodiment of the present invention. Similar to the above... Figures 1-5 The difference between the filtered detection device shown is that... Figure 6 In the filtered detection device 600 shown, the adaptive filter circuit is located before the detection module, specifically, it is connected in series between the power conversion module and the detection module.

[0103] like Figure 6 As shown, the filtered detection device 600 includes a power supply control circuit 601 and an adaptive filter circuit 602.

[0104] The power supply control circuit 601 includes a controller 6011, N power supply channels (6012-1 to 6012-N), and N detection modules, where N is a positive integer. Each power supply channel corresponds to one detection module. Each power supply channel includes a control switch. The control switch is used to turn the power supply channel to which it is located on or off. During the detection process of each power supply channel, the control switch in that channel is in the off state.

[0105] The adaptive filter circuit 602 includes an input terminal 6021 and an output terminal 6022. The adaptive filter circuit 602 includes a filter F for filtering common-mode noise from the power supply, thereby filtering out noise in the detection signal. The filter F is connected in series between the input terminal 6021 and the output terminal 6022. The input terminal 6021 of the adaptive filter circuit 602 is connected to the power conversion module, and the output terminal 6022 of the adaptive filter circuit 602 is connected to the input terminals of N detection modules. Figure 6 The adaptive filter circuit 602 shown can filter out noise in the power supply to the detection module, thereby filtering out noise in the detection signal at its source. Optionally, as... Figure 7 In the filtered detection device 600 shown, the adaptive filter circuit 602 further includes a selection switch SW, used to select whether to pass or not filter common-mode noise from the power supply through the filter F. This selection switch SW is a single-pole double-throw switch. Figure 7 The selection switch SW shown is for illustrative purposes only. In actual implementation, the selection switch SW can also be implemented using MOSFETs, relays, optocouplers, transistors, etc.

[0106] The extreme P of the selector switch SW is connected to the input terminal 6021 of the adaptive filter circuit 602 (that is, connected to the output terminal of the power conversion module). The first terminal T11 of the selector switch SW is connected to the first terminal f11 of the filter F. The second terminal T12 of the selector switch SW is connected to the output terminal 6022 of the adaptive filter circuit 602. The second terminal f12 of the filter F1 is connected to the output terminal 6022 of the adaptive filter circuit 602.

[0107] If the selector switch SW's extreme P is connected to the first input terminal T11, it indicates that filter F is used to filter common-mode interference signals from the power supply. If the selector switch SW's extreme P is connected to the second input terminal T12, it indicates that filter F is not used to filter common-mode noise from the power supply. Specifically, the selector switch SW connects the input terminals of the power conversion module, filter F, and N detection modules according to the first control command issued by the controller 6011, so that common-mode noise from the power supply can be filtered by filter F; or, the selector switch SW connects the input terminals of the power conversion module and N detection modules according to the second control command issued by the controller 6011, so that filter F will not be used to filter common-mode noise from the power supply.

[0108] See Figure 8 This is a schematic diagram of another filtering detection device provided in an embodiment of the present invention, which is similar to the one described above. Figures 1-5 The difference between the filtered detection device shown is that... Figure 8 In the filter-equipped detection device 800 shown, the adaptive filter circuit is set in the detection module.

[0109] like Figure 8 As shown, each detection module includes a filter to filter noise in the detection signal. All filters in the detection modules are part of an adaptive filtering circuit.

[0110] Optionally, in Figure 8 In addition, each detection module may include a selection switch to choose whether to filter noise in the detection signal using a filter. This selection switch is a single-pole double-throw switch and can be implemented using MOSFETs, relays, optocouplers, transistors, etc. In this implementation, the filters and switching switches in all detection modules are part of an adaptive filtering circuit.

[0111] In embodiments of the present invention, such as Figures 1 to 8 The power supply device with filtering shown is illustrative of N power supply channels sharing one controller and is not intended to limit the invention. In a specific implementation, each power supply channel may correspond to a separate channel controller. In this case, the channel controllers for each power supply channel can be considered integrated into a single controller. Figures 1 to 8 The controller shown.

[0112] See Figure 9 This is a schematic diagram of a power supply system provided in an embodiment of the present invention. The power supply system includes a power supply device 901 and a power receiving device 902. The power supply device 901 includes at least one power supply port. The at least one power supply port can be connected to the power receiving device 902 and can perform noise-filtered detection on the power receiving device 902 to ensure accurate detection results. The power supply device 901 includes, for example... Figures 1-9 Any of the filter-equipped detection devices shown.

[0113] In this embodiment of the invention, PoE is used as an example for illustration. The invention is also applicable to scenarios employing similar power supply technologies, such as Power over Data lines (PoDL). In PoDL scenarios, those skilled in the art can make adaptive modifications, changes, or substitutions to different protocols based on this embodiment of the invention, and these modifications and substitutions should also be covered within the scope of protection of this invention.

[0114] Those skilled in the art will understand that all or part of the steps in the above method embodiments can be implemented by a program instructing related hardware, and the corresponding program can be stored in a computer-readable storage medium, such as a random access memory, read-only memory, flash memory, hard disk, solid-state drive, or optical disk.

[0115] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A filter-equipped detection device for use in power supply equipment (PSE), characterized in that, The filtered detection device includes: a power supply control circuit and an adaptive filtering circuit; The power supply control circuit includes a first power supply channel and a first detection module; The first power supply channel includes a first control switch, which is used to control the opening and closing of the first power supply channel; The first detection module is used to send a first detection signal to the first power supply channel to detect whether the peer device connected to the first power supply channel is a valid power receiving device. The first detection signal contains common-mode noise from the power supply. The adaptive filtering circuit is used to filter common-mode noise in the first detection signal during the detection process of the first power supply channel, wherein the first control switch is disconnected during the detection process of the first power supply channel.

2. The apparatus according to claim 1, characterized in that, The adaptive filtering circuit includes a first filter; The first filter is connected in series between the first input terminal and the first output terminal of the adaptive filter circuit; The first filter is used to filter common-mode noise in the first detection signal during the detection process.

3. The apparatus according to claim 2, characterized in that, The adaptive filtering circuit also includes a first selection switch; The first selection switch is used to connect the first input terminal of the adaptive filter circuit, the first filter, and the first output terminal of the adaptive filter circuit according to the first control command, so as to filter the common-mode noise in the first detection signal through the first filter.

4. The apparatus according to claim 3, characterized in that, The power supply control circuit further includes a controller; the controller is used to send the first control command to the first selector switch.

5. The apparatus according to any one of claims 1 to 4, characterized in that, The first input terminal of the adaptive filter circuit is connected to the output terminal of the first detection module, and the first output terminal of the adaptive filter circuit is connected to the output terminal of the first power supply channel. Alternatively, the first input terminal of the adaptive filter circuit is connected to the power supply, and the first output terminal of the adaptive filter circuit is connected to the input terminal of the first detection module. Alternatively, the adaptive filtering circuit may be located within the first detection module.

6. The apparatus according to claim 1, characterized in that, The power supply control circuit also includes a second power supply channel and a second detection module; The second power supply channel includes a second control switch, which is used to control the opening and closing of the second power supply channel; The second detection module is used to send a second detection signal to the second power supply channel to detect whether the peer device connected to the second power supply channel is a valid power receiving device; The adaptive filtering circuit is further used to filter common-mode noise in the second detection signal during the detection process of the second power supply channel, wherein the second control switch is disconnected during the detection process of the second power supply channel.

7. The apparatus according to claim 6, characterized in that, The adaptive filtering circuit includes a first filter and a second filter, wherein the first filter corresponds to the first power supply channel and the second filter corresponds to the second power supply channel; The first filter is connected in series between the first input terminal and the first output terminal of the adaptive filter circuit; the second filter is connected in series between the second input terminal and the second output terminal of the adaptive filter circuit. The first filter is used to filter common-mode noise in the first detection signal during the detection process of the first power supply channel; The second filter is used to filter common-mode noise in the second detection signal during the detection process of the second power supply channel.

8. The apparatus according to claim 7, characterized in that, The adaptive filter circuit also includes a first selection switch and a second selection switch; The first selection switch is used to connect the first input terminal of the adaptive filter circuit, the first filter, and the first output terminal of the adaptive filter circuit according to the first control command, so as to filter the common-mode noise in the first detection signal through the first filter; The second selection switch is used to connect the second input terminal of the adaptive filter circuit, the second filter, and the second output terminal of the adaptive filter circuit according to the first control command, so as to filter the common-mode noise in the second detection signal through the second filter.

9. The apparatus according to claim 6, characterized in that, The adaptive filtering circuit includes a common filter and a common selection switch; The first input terminal of the adaptive filter circuit is connected to the output terminal of the first detection module, and the first output terminal of the adaptive filter circuit is connected to the output terminal of the first power supply channel. The second input terminal of the adaptive filter circuit is connected to the output terminal of the second detection module, and the second output terminal of the adaptive filter circuit is connected to the output terminal of the second power supply channel. The common selection switch is used to connect the output terminals of the first detection module, the common filter and the first power supply channel according to the first selection instruction, so as to filter the common-mode noise in the first detection signal through the common filter. The common selection switch is also used to connect the output terminals of the second detection module, the common filter, and the second power supply channel according to the second selection instruction, so as to filter the common-mode noise in the second detection signal through the common filter.

10. The apparatus according to claim 9, characterized in that, The power supply control circuit also includes a controller, which is used to send the first selection command and the second selection command to the common selection switch.

11. A power supply device (PSE), characterized in that, It includes at least one port and a band-filtered detection device as described in any one of claims 1-10, the band-filtered detection device being used to detect the at least one port.

12. A power supply system, characterized in that, It includes a power receiving device (PD) and a power supply device (PSE) as described in claim 11, wherein the power receiving device (PD) is connected to the power supply device (PSE) via a twisted pair cable.

13. A chip, characterized in that, Includes programmable logic circuitry and / or instructions, which, when the chip is running, implement the filtered detection device as described in any one of claims 1-10.

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