WO2017016314A1 - Poe供电模块及设置有poe供电模块的线缆 - Google Patents

Poe供电模块及设置有poe供电模块的线缆 Download PDF

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Publication number
WO2017016314A1
WO2017016314A1 PCT/CN2016/084480 CN2016084480W WO2017016314A1 WO 2017016314 A1 WO2017016314 A1 WO 2017016314A1 CN 2016084480 W CN2016084480 W CN 2016084480W WO 2017016314 A1 WO2017016314 A1 WO 2017016314A1
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WIPO (PCT)
Prior art keywords
signal
power supply
poe
unit
power
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Ceased
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PCT/CN2016/084480
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English (en)
French (fr)
Inventor
赵鹏飞
谷利飞
陈树毅
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Hangzhou Hikvision Digital Technology Co Ltd
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Hangzhou Hikvision Digital Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/10—Current supply arrangements

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  • the present application relates to the field of network camera technologies, and in particular, to a POE power supply module and a cable provided with a POE power supply module.
  • PSE Power Over Ethernet
  • PD Powered Device
  • the current economical and miniaturized IP camera can only rely on the on-site installation environment to provide power due to structural and cost constraints, which is greatly limited by the application.
  • the structure of the network port power cable used by the IPC is as shown in FIG. 1 .
  • the cable has a data input terminal 11a, a power supply input terminal 11b and an output terminal 12, wherein the data input terminal 11a and the power supply input terminal 11b are connected to the output terminal 12 by wires. In this way, the cable only has the transfer of data and power.
  • the data input end 11a of the cable is connected to the network device for receiving the data signal; the power input terminal 11b is connected to the external power source to receive the external DC power; the output terminal 12 is connected to the receiving port of the camera, thereby The camera transmits data signals and supplies power.
  • the existing network port power cable is essentially a normal wire and does not perform any processing on the signal.
  • One of the objectives of the present application is to provide a POE power supply module, which can integrate a common network port power cable with a POE power supply function.
  • the application first provides a POE power supply module, including:
  • a network transformer unit that decomposes a POE network signal into a data signal and an AC signal
  • a rectifying unit that rectifies and outputs an intermediate signal to the alternating current signal
  • the detecting unit generates a feedback signal according to the intermediate signal, and transmits the feedback signal to the PSE device through the network transforming unit, so that the detecting unit performs a handshake with the PSE device;
  • the DC conversion unit converts the intermediate signal into a DC signal suitable for the power receiving device after the handshake is completed.
  • the method further includes:
  • the auxiliary power supply unit has an input terminal receiving an external DC power supply signal, and an output end connected to the output end of the DC conversion unit to transmit an external DC power supply signal to the output end of the DC conversion unit.
  • the DC conversion unit includes:
  • a switching circuit that generates a switching signal based on the intermediate signal
  • a flyback transformer that converts the intermediate signal into the DC signal under the action of a switching signal.
  • the flyback transformer includes a primary winding, a secondary winding, and an auxiliary winding disposed on one side of the primary winding;
  • the switching circuit includes a PWM control chip and a zero-crossing detection circuit
  • the PWM control chip integrates a PWM logic component and a switching transistor, the PWM logic component outputs a pulse width modulation signal to drive the gate of the switching transistor, the drain of the switching transistor generates a switching signal, and the primary winding generates a pulse voltage according to the switching signal.
  • the PWM logic component outputs a pulse width modulation signal to drive the gate of the switching transistor
  • the drain of the switching transistor generates a switching signal
  • the primary winding generates a pulse voltage according to the switching signal.
  • One end of the zero-crossing detection circuit is connected to the auxiliary winding, and the other end is connected to the detection pin of the PWM control chip, and the PWM control chip adjusts the duty ratio of the pulse width modulation signal according to the detected auxiliary winding voltage.
  • the feedback signal includes a detection feedback signal and a power grading feedback signal
  • the process of the handshake between the detecting unit and the PSE device includes a detection phase and a power grading phase
  • the detection current generated by the detecting unit on the intermediate signal is used as a detection feedback signal
  • the PSE device identifies the POE power supply module as conforming based on the detection feedback signal.
  • the characteristic current generated by the detecting unit on the intermediate signal is used as a power grading feedback signal, and the PSE device identifies the power level of the POE power supply module based on the power grading feedback signal.
  • the application also provides a POE power supply cable, including:
  • the POE power supply module is disposed in the POE power supply cable, and the POE power supply module includes: a network transformer unit, which decomposes the POE network signal into a data signal and an AC signal; and a rectification unit that rectifies and outputs the AC signal An intermediate signal; a detecting unit, generating a feedback signal according to the intermediate signal, transmitting the feedback signal to the PSE device through the network transformation unit, so that the detecting unit and the PSE device perform a handshake; and the DC conversion unit, after the handshake is completed The intermediate signal is converted into a DC signal suitable for the powered device;
  • a network connection cable one end of which is connected to the input end of the network transformer unit, and the other end is connected to the Ethernet adapter module;
  • the PD device is connected to the cable, and one end thereof is connected to the data output end of the network transformer unit and the output end of the DC conversion unit, and the other end is connected to the PD device interface module.
  • the PD device connection cable includes:
  • a PD device data line one end of which is connected to the data signal output end of the network transformer unit, and the other end is connected to the data terminal of the PD device interface module;
  • the PD device power cable has one end connected to the output end of the DC conversion unit and the other end connected to the power terminal of the PD device interface module.
  • the POE power supply module further includes:
  • the auxiliary power supply unit has an input terminal receiving an external DC power supply signal, and an output end connected to the output end of the DC conversion unit to transmit an external DC power supply signal to the output end of the DC conversion unit.
  • the auxiliary power line has one end connected to the input end of the auxiliary power supply unit and the other end connected to the auxiliary power port.
  • the DC conversion unit includes:
  • a switching circuit that generates a switching signal based on the intermediate signal
  • a flyback transformer that converts the intermediate signal into the DC signal under the action of a switching signal number.
  • the flyback transformer includes a primary winding, a secondary winding, and an auxiliary winding disposed on one side of the primary winding;
  • the switching circuit includes a PWM control chip and a zero-crossing detection circuit
  • the PWM control chip integrates a PWM logic component and a switching transistor, the PWM logic component outputs a pulse width modulation signal to drive the gate of the switching transistor, the drain of the switching transistor generates a switching signal, and the primary winding generates a pulse voltage according to the switching signal.
  • the PWM logic component outputs a pulse width modulation signal to drive the gate of the switching transistor
  • the drain of the switching transistor generates a switching signal
  • the primary winding generates a pulse voltage according to the switching signal.
  • One end of the zero-crossing detection circuit is connected to the auxiliary winding, and the other end is connected to the detection pin of the PWM control chip, and the PWM control chip adjusts the duty ratio of the pulse width modulation signal according to the detected auxiliary winding voltage.
  • the feedback signal includes a detection feedback signal and a power grading feedback signal
  • the process of the handshake between the detecting unit and the PSE device includes a detection phase and a power grading phase
  • the detecting unit generates a detection current generated by the detecting unit as the detection feedback signal, and the PSE device identifies the POE power supply module as a legal device conforming to the IEEE802.3af protocol based on the detection feedback signal;
  • the characteristic current generated by the detecting unit on the intermediate signal is used as a power grading feedback signal, and the PSE device identifies the power level of the POE power supply module based on the power grading feedback signal.
  • the method further includes: a protective housing for housing the POE power supply module.
  • the POE power supply module of the present application has a simple circuit structure, can eliminate an external MOS circuit module and an optocoupler feedback circuit module, and greatly reduces the PCB layout area, and is very suitable for being packaged in a wire.
  • the POE power supply module of the present application does not need to add an integrated PD module in the hardware of the IPC to separate the POE signal from the Ethernet into a data signal and a power signal through the PD module.
  • the application of the POE power supply module of the present application can avoid the increase of the manufacturing cost of the IPC caused by the integrated circuit device in the PD module, and can avoid adding an integrated PD module in the hardware and occupying a printed circuit board (PCB). Layout area, leading to IPC The problem of increased volume.
  • a sleeve of a certain diameter and length is added between the input and the output of the common network port power supply harness, and a circuit board capable of realizing the POE power supply function is added in the sleeve, and the wire line sequence is completely compatible with the same paragraph.
  • POE function network port power combination line sequence is completely compatible with the same paragraph.
  • the POE power supply cable of the present application can be directly applied to an Ethernet client device that has been developed and not supporting POE, and expands its POE power supply function, thereby realizing product line expansion, saving secondary development cost, and improving product competitiveness.
  • FIG. 1 is a schematic structural view of a power port of a network port in the prior art
  • FIG. 2 is a schematic structural diagram of a POE power supply cable according to Embodiment 1 of the present application;
  • FIG. 3 is a structural block diagram of a POE power supply module according to Embodiment 1 of the present application.
  • FIG. 4 is a schematic circuit diagram of a DC conversion unit according to Embodiment 2 of the present application.
  • the present invention provides a network port power cable with a built-in POE power supply module, and extends the POE function for an Ethernet client that does not have a POE power supply function, and does not affect the main hardware and structure of the existing Ethernet client.
  • a non-POE Ethernet client you can switch between the non-POE client device and the POE client device by replacing the existing network port power cable with the new power cable provided in this application.
  • a POE power supply module provided by the present application can be built in a network port power line.
  • the power cable of the network port can be any existing power cable of the network port, which is not described here.
  • the new power supply cable provided in this embodiment is also applicable to other client devices of the POE system, such as IP phones, APs, PDAs or mobile phone chargers, etc.
  • FIG. 2 is a schematic structural diagram of a POE power supply cable according to the embodiment.
  • the cable mainly includes a network connection cable 210, a POE power supply module 220, and a PD device connection cable 230.
  • the power supply cable in this embodiment can be used in the POE power supply mode and the non-POE power supply mode.
  • the network connection cable 210 is connected to the PSE device in the POE system, and the POE power supply module 220 extracts the data signal and the DC power signal from the POE signal conforming to the IEEE802.3af protocol, and the PD device connects the cable 230 and the PD.
  • the device is connected to provide DC power to the PD device.
  • the PD device is an Ethernet client device that does not support the IEEE802.3af protocol.
  • the DC power signal is a DC signal that is processed by the rectification unit, the detection unit, and the DC conversion unit included in the POE power supply module 220 by the network voltage conversion unit included in the POE power supply module 220.
  • the PD device connection cable 230 is connected to the PD device, and the DC power source is supplied to the PD device through the DC power signal.
  • FIG. 3 is a structural block diagram of the POE power supply module 220.
  • the POE power supply module 220 mainly includes a network transforming unit 221, a rectifying unit 222, a detecting unit 223, and a DC converting unit 224.
  • the network transform unit 221 has an input terminal 221a for receiving a POE signal.
  • the network transforming unit 221 is also provided with a data output terminal 221b and a power output terminal 221c.
  • the network transformer unit 221 decomposes the POE network signal into a data signal and an AC signal, and outputs a data signal on the data output terminal 221b, and outputs an AC signal AC on the power output terminal 221c.
  • the input end of the rectifying unit 222 is connected to the power output end 221c of the network transforming unit 221 for rectifying the AC signal to output an intermediate signal.
  • an intermediate signal For example, the DC 48V voltage signal shown in Figure 3.
  • the detecting unit 223 is connected to the output end of the rectifying unit 222, and the detecting unit 223 generates a feedback signal according to the intermediate signal, and transmits the feedback signal to the PSE device through the network transforming unit, and the PSE device Prepare for a handshake.
  • the feedback signal includes a detection feedback signal and a power classification feedback signal.
  • the process of the handshake unit of the detecting unit 223 and the PSE device includes a detection phase and a power classification phase.
  • the detecting unit 223 identifies a small level signal output by the PSE device, generates a detecting current based on its characteristic resistance under the action of the level signal, and uses the detected current as a detection feedback signal, so that The PSE device identifies the POE power supply module 220 as a legitimate PD device conforming to the IEEE 802.3af protocol based on the detection feedback signal.
  • the detecting unit 223 generates a characteristic current under the action of the grading detection level output by the PSE device, and uses the characteristic current as a power grading feedback signal, and the PSE device identifies the power level of the POE power supply module based on the power grading feedback signal.
  • the POE power supply module 220 completes the handshake with the PSE device.
  • the PSE device provides a 48V intermediate DC power signal to the PD device.
  • the DC conversion unit 224 has an input terminal 224a and an output terminal 224b, and an input terminal 224a of the DC conversion unit is connected to an output terminal of the rectifier unit 222.
  • the DC conversion unit 224 converts the 48V intermediate DC power signal output from the rectifying unit 222 into a 12V DC signal suitable for the power receiving device, and outputs the DC signal on the output terminal 224b.
  • one end of the network connection cable 210 is connected to the input end 221a of the network transformer unit 221, and the other end is connected to the Ethernet adapter module 210a, thereby transmitting the POE signal generated by the PSE device to the network transform unit 221, Extract data signals and DC power signals.
  • the PSE device is connected to the network transformer unit 221 of the POE power supply module 220 through the network connection cable 210, and the detection unit 223 transmits the feedback signal to the PSE device through the network transformation unit 221 to perform handshake with the PSE device.
  • the intermediate DC power signal is the intermediate signal mentioned in the embodiment of the present application.
  • the Ethernet adapter module 210a can be an RJ45 port, wherein the eight twisted pairs are connected to the eight twisted pairs of the network connection cable 210 in one-to-one correspondence, and are connected to the input end 221a of the network transformer unit 221, and can be Supports 1, 2, 3, and 6 data lines and 4, 5, 7, and 8 idle lines for power supply.
  • One end of the PD device connection cable 230 is connected to the data output terminal 221b of the network transformer unit 221 and the output terminal 224b of the DC conversion unit, and the other end is connected to the PD device interface module 230a to provide a data signal and a DC power signal to the PD device.
  • the interface module 230a of the PD device is connected to the data output terminal 221b of the network transformer unit 221 of the POE power supply module 220 and the output terminal 224b of the DC conversion unit through the connection cable 230.
  • the PD device is a network camera IPC having a 6-core to a board-end socket (male), and correspondingly, the PD device interface module 230a is configured as a 6-pin plastic case socket (female).
  • the PD device connection cable 230 includes a PD device data line and a PD5 device power line.
  • the data line of the PD device may include four twisted pairs. One end of the data line of the PD device is connected to the data output end 221b of the network transformer unit, and the other end is connected to the data terminals D1 to D4 of the PD device interface module 230a.
  • the power cable of the PD device includes two twisted pairs.
  • One end of the power cable of the PD device is connected to the output end 224b of the DC conversion unit, and the other end is connected to the power terminals D5 to D6 of the PD device interface module 230a.
  • the data signal extracted from the POE signal is transmitted to the PD device through the data terminals D1 to D4, and the DC power supply signal decomposed from the POE signal is supplied to the PD device through the power supply terminals D5 to D6.
  • the POE power supply cable of the embodiment further includes an auxiliary power line 240 connected to an external 12V DC power source for providing power to the PD device in the non-POE power supply mode.
  • the network connection cable 210 is connected to an Ethernet switching device that does not support the IEEE802.3af protocol, and the POE power supply module 210 only forwards data signals. Specifically, the network transforming unit 221 outputs a data signal on the data output terminal 221b, and no power signal output on the power output terminal 221c. Thus, the rectifying unit 222, the detecting unit 223, and the DC converting unit 224 do not operate, and it is necessary to provide additional DC power to the PD device through the auxiliary power line 240.
  • the POE power supply module 220 further includes an auxiliary power supply unit 225 whose input terminal 225a receives an external DC power supply signal and the output terminal 225b is coupled to the output terminal 224b of the DC conversion unit.
  • one end of the auxiliary power line 240 is connected to the input terminal 225a of the auxiliary power supply unit, and the other end is connected to the auxiliary power port, and then the external DC power signal is transmitted to the output terminal 224b of the DC conversion unit, and through the power terminals D5 to D6.
  • the PD device Provided to the PD device.
  • the embodiment is equivalent to expanding the function of the common network port power line by using the POE power supply module, and the installation and use are convenient, and the hardware function of the non-POE client device is not affected, and the same client device only needs to be Switch the network port power line material to realize the POE model and Switching of non-POE models.
  • the POE power supply cable When the network inputs a network signal without a POE function, the POE power supply cable only transmits the network signal.
  • the POE power cable can output DC12V and network signal, which can save DC12V power input.
  • the POE network signal and the external DC12V power supply are input at the same time, it will not cause any interference.
  • the DC12V is the DC signal mentioned in the embodiment
  • the network signal is the data signal mentioned in the embodiment.
  • a protective housing 250 is disposed on the POE power supply cable for accommodating the POE power supply module 220.
  • the protective housing is preferably designed as a cylindrical sleeve.
  • the sleeve is 80 mm long and 18.5 mm in diameter, and the POE power supply module 220 is fabricated on a small circuit board and disposed in the sleeve 250.
  • the DC conversion unit includes a flyback transformer 410 and a switching circuit 420.
  • the switching circuit 420 generates a switching signal based on an intermediate signal generated by the rectifying unit, and the flyback transformer 410 converts the intermediate DC power signal into a DC signal under the action of the switching signal.
  • the intermediate DC power signal is an intermediate signal.
  • the DC conversion unit 224 provided in this embodiment has a simple circuit structure, can eliminate an external MOS circuit module and an optocoupler feedback circuit module, and greatly reduces the PCB layout area, and is very suitable for being packaged in a wire.
  • the flyback transformer 410 includes a primary winding, a secondary winding, and an auxiliary winding disposed on one side of the primary winding.
  • the input end (terminal No. 2) of the primary winding is configured as an input terminal Vi of the DC conversion unit 224, connected to the rectifying unit, and receives a 48V intermediate DC signal generated by the rectifying unit.
  • the output of the primary winding (terminal No. 1) is connected to the switching circuit 420, and the voltage on the primary winding is controlled according to the switching signal. When the switching signal is turned off, a flyback voltage is reflected from the primary winding to the secondary winding and the auxiliary winding.
  • the 48V intermediate DC signal is an intermediate DC power signal (intermediate signal).
  • One end of the secondary winding (terminal 5) is connected to the anode of the output diode DP1, and the output diode DP1 The cathode is connected to the output terminal Vo of the direct current conversion unit 224.
  • the other end of the secondary winding (terminal 6) is connected to one end of the output capacitor CP4, and the other end of the output capacitor CP4 is connected to the cathode of the output diode DP1.
  • the output capacitor CP4 is used to filter the output 12V DC voltage.
  • One end of the auxiliary winding (terminal No. 3) is connected to the reference level HGND, and the other end (terminal No. 4) is connected to the switching circuit 420 to supply a feedback voltage Vs to the switching circuit.
  • the switch circuit 420 is implemented by a PWM (Pulse Width Modulation) controller SY6177FAC and its peripheral circuits. Since the POE power supply module is integrated in the power supply cable in the embodiment of the present application, the circuit is required to have a high degree of integration and occupy a smaller volume.
  • the SY6177FAC integrates PWM control components and MOS components, and simplifies peripheral circuits.
  • the switch circuit 420 mainly includes a PWM control chip (SY6177FAC) and a zero-crossing detection circuit.
  • the PWM control chip integrates a PWM logic component and a switching transistor (MOS transistor), the PWM logic component outputs a pulse width modulation signal to drive the gate of the switching transistor, and the drain of the switching transistor generates a switching signal for controlling the primary winding to generate a pulse.
  • the voltage, on the secondary winding excites a pulse voltage with a reduced amplitude, and the filter circuit outputs a low-voltage DC power supply signal suitable for the power receiving device.
  • the 48V intermediate DC signal generated by the rectifying unit is connected to the power input pin (VIN) of the SY6177FAC chip through RP16 to form a resistor starting circuit, which can help the SY6177FAC chip start when power supply is started.
  • One end of the CP17 is connected to the power input pin (VIN) of the SY6177FAC chip, and one end is grounded to stabilize the current input to the SY6177FAC chip.
  • the input pin (DR) of the SY6177FAC chip is the drain of the on-chip MOS transistor, and is connected to the output terminal (terminal No. 1) of the primary winding of the flyback transformer 410.
  • the SY6177FAC uses the output current primary side adjustment technique.
  • the MOS transistor is controlled by an internal PWM logic element to generate a switching signal on the drain of the MOS transistor. When the MOS transistor is turned on, a current flows in the primary winding. When the MOS transistor is turned off, the current of the primary winding is interrupted, thereby controlling the primary winding to be turned on and off.
  • the pulse width modulation signal output by the PWM logic element determines the length of time the MOS transistor is turned on.
  • the primary winding generates a pulse voltage, which can excite the secondary winding to generate a pulse voltage with a reduced amplitude.
  • the pulse voltage is filtered by a filter circuit composed of an output capacitor CP4 and a diode DP1, and then outputs a low-voltage 12V DC power supply signal suitable for the power receiving device.
  • the output pin (GND) of the SY6177FAC chip is grounded (the ground here is isolated from the ground of the flyback transformer secondary winding).
  • RP11 and RP14 constitute a zero-crossing detection circuit.
  • the zero-crossing detection circuit one end of RP14 and one end of RP11 are connected to the detection pin (ZCS) of the SY6177FAC chip, the other end of RP14 is grounded (HGND), and the other end of RP11 is connected to the 4th end of the auxiliary winding.
  • the flyback transformer in the prior art usually sets an optocoupler feedback circuit module to feed back the output voltage of the secondary winding to the PWM control chip.
  • the optocoupler feedback circuit module can be omitted, and the voltage of the auxiliary winding is used.
  • the SY6177FAC chip compares the auxiliary winding voltage Vs with the internal reference voltage, and adjusts the duty cycle of the pulse width modulation signal according to the detected auxiliary winding voltage Vs to keep the voltage of the secondary winding output constant.
  • sampling resistor RP12 is connected to the current feedback pin (ISEN) of the switch chip, and the other end is grounded.
  • the PWM logic component performs current sampling through the sampling resistor RP12, adjusts the duty cycle of the PWM signal, and implements overcurrent protection.
  • the resistor RP10 and the capacitor CP12 are connected in series to form an RC compensation circuit.
  • One end of the resistor RP10 is connected to the compensation pin (COMP) of the switch chip, and the capacitor CP12 is connected to the GND.
  • the compensation loop is used to stabilize the closed loop for fast transient response.
  • the SY6177FAC is a PWM controller that enhances the performance of the flyback transformer.
  • the chip integrates a 200V withstand voltage transistor (MOSFET), eliminating the need for an external MOS transistor, saving the physical size of the switch circuit 420.
  • MOSFET 200V withstand voltage transistor
  • the SY6177FAC adjusts voltage and current through primary control technology for low cost applications. In order to achieve higher efficiency and better EMI performance, the SY6177FAC drives the flyback transformer 410 to operate in a quasi-resonant state.
  • the SY6177FAC scheme has a simple circuit structure, can eliminate the external MOS circuit module and the optocoupler feedback circuit module, saves volume and resources, and greatly reduces the PCB layout area.

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Abstract

一种POE供电模块，包括：网络变压单元（221），将POE网络信号分解为数据信号和交流信号；整流单元（222），对所述交流信号进行整流，输出中间信号；检测单元（223），根据所述中间信号产生反馈信号，将所述反馈信号通过网络变压单元（221）传输至PSE设备，以使得检测单元（223）与PSE设备进行握手；直流转换单元（224），在握手完成之后将所述中间信号转换为受电设备适用的直流信号。可用于不支持POE协议的以太网客户端设备，扩展POE供电功能。

Description

POE供电模块及设置有POE供电模块的线缆
本申请要求于2015年7月29日提交中国专利局、申请号为201520558825.5发明名称为“POE供电模块及设置有POE供电模块的线缆”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及网络摄像机技术领域，具体地说，涉及一种POE供电模块以及一种设置有POE供电模块的线缆。
背景技术
以太网供电(Power Over Ethernet，简称POE)技术是指在现有的以太网布线基础架构上，为IP终端传输数据信号并同时提供直流供电的技术。POE系统由供电端设备(Power Sourcing Equipment，简称PSE)和受电端设备(Powered Device，简称PD)两部分组成，PSE设备为PD设备供电。
目前的经济型、小型化的网络摄像机(IP camera，简称IPC)由于受到结构和成本的限制，只能依赖于现场安装环境提供电源，受应用场合的限制较大。现有技术中，IPC使用的网口电源线缆的结构如图1所示。该线缆具有数据输入端11a、电源输入端11b和输出端12，其中，数据输入端11a和电源输入端11b通过导线与输出端12连接。这样，该线缆仅具有数据和电源的传递作用。在使用时，该线缆的数据输入端11a与网络设备连接，用于接收数据信号；电源输入端11b与外部电源连接，以接收外部直流电能；输出端12与摄像机的接收端口连接，从而为摄像机传递数据信号并进行供电。
显然，现有的网口电源线缆实质上仅是普通导线，不会对信号进行任何处理。
因此，亟需一种网口电源线来为普通IP摄像机扩展POE供电功能。
实用新型内容
本申请的目的之一在于提供一种POE供电模块，能够使普通的网口电源线缆集成POE供电功能。
本申请首先提供一种POE供电模块，包括：
网络变压单元，将POE网络信号分解为数据信号和交流信号；
整流单元，对所述交流信号进行整流输出中间信号；
检测单元，根据所述中间信号产生反馈信号，将所述反馈信号通过网络变压单元传输至PSE设备，以使得检测单元与PSE设备进行握手；
直流转换单元，在握手完成之后将所述中间信号转换为受电设备适用的直流信号。
在一个实施例中，还包括：
辅助供电单元，其输入端接收外部直流电源信号，输出端与直流转换单元的输出端连接，以将外部直流电源信号传递至直流转换单元的输出端。
在一个实施例中，所述直流转换单元包括：
开关电路，基于中间信号生成开关信号；
反激式变压器，在开关信号的作用下将所述中间信号转换为所述直流信号。
在一个实施例中，所述反激式变压器包括初级绕组、次级绕组和设置于初级绕组一侧的辅助绕组；
所述开关电路包括PWM控制芯片和过零检测电路；
其中，PWM控制芯片内部集成PWM逻辑元件和开关晶体管，PWM逻辑元件输出脉冲宽度调制信号来驱动开关晶体管的栅极，开关晶体管的漏极产生开关信号，初级绕组根据所述开关信号产生脉冲电压，从而在次级绕组上激发幅值降低的脉冲电压，进而对幅值降低的脉冲电压进行滤波输出所述直流信号；
过零检测电路的一端连接辅助绕组，另一端连接PWM控制芯片的检测管脚，PWM控制芯片根据检测到的辅助绕组电压调整脉冲宽度调制信号的占空比。
在一个实施例中，所述反馈信号包括检测反馈信号和功率分级反馈信号，检测单元与PSE设备进行握手的过程包括检测阶段和功率分级阶段；
其中，在检测阶段中，检测单元对所述中间信号产生的检测电流作为检测反馈信号，PSE设备基于所述检测反馈信号将POE供电模块识别为符合 IEEE802.3af协议的合法设备；
在功率分级阶段中，检测单元对所述中间信号产生的特征电流作为功率分级反馈信号，PSE设备基于所述功率分级反馈信号识别POE供电模块的功率等级。
本申请还提供一种POE供电线缆，包括：
POE供电模块，其设置在所述POE供电线缆内，所述POE供电模块包括：网络变压单元，将POE网络信号分解为数据信号和交流信号；整流单元，对所述交流信号进行整流输出中间信号；检测单元，根据所述中间信号产生反馈信号，将所述反馈信号通过网络变压单元传输至PSE设备，以使得检测单元与PSE设备进行握手；直流转换单元，在握手完成之后将所述中间信号转换为受电设备适用的直流信号；
网络连接线缆，其一端连接所述网络变压单元的输入端，另一端连接以太网适配模块；
PD设备连接线缆，其一端连接所述网络变压单元的数据输出端和所述直流转换单元的输出端，另一端连接PD设备接口模块。
在一个实施例中，所述PD设备连接线缆包括：
PD设备数据线，其一端连接所述网络变压单元的数据信号输出端，另一端连接PD设备接口模块的数据端子；
PD设备电源线，其一端连接所述直流转换单元的输出端，另一端连接PD设备接口模块的电源端子。
在一个实施例中，所述POE供电模块还包括：
辅助供电单元，其输入端接收外部直流电源信号，输出端与直流转换单元的输出端连接，以将外部直流电源信号传递至直流转换单元的输出端。
在一个实施例中，进一步包括：
辅助电源线，其一端连接所述辅助供电单元的输入端，另一端连接辅助电源端口。
在一个实施例中，所述直流转换单元包括：
开关电路，基于中间信号生成开关信号；
反激式变压器，在开关信号的作用下将所述中间信号转换为所述直流信 号。
在一个实施例中，其特征在于，
所述反激式变压器包括初级绕组、次级绕组和设置于初级绕组一侧的辅助绕组；
所述开关电路包括PWM控制芯片和过零检测电路；
其中，PWM控制芯片内部集成PWM逻辑元件和开关晶体管，PWM逻辑元件输出脉冲宽度调制信号来驱动开关晶体管的栅极，开关晶体管的漏极产生开关信号，初级绕组根据所述开关信号产生脉冲电压，从而在次级绕组上激发幅值降低的脉冲电压，进而对幅值降低的脉冲电压进行滤波输出所述直流信号；
过零检测电路的一端连接辅助绕组，另一端连接PWM控制芯片的检测管脚，PWM控制芯片根据检测到的辅助绕组电压调整脉冲宽度调制信号的占空比。
在一个实施例中，所述反馈信号包括检测反馈信号和功率分级反馈信号，检测单元与PSE设备进行握手的过程包括检测阶段和功率分级阶段；
其中，在检测阶段中，检测单元对所述中间信号产生的检测电流作为检测反馈信号，PSE设备基于所述检测反馈信号将POE供电模块识别为符合IEEE802.3af协议的合法设备；
在功率分级阶段中，检测单元对所述中间信号产生的特征电流作为功率分级反馈信号，PSE设备基于所述功率分级反馈信号识别POE供电模块的功率等级。
在一个实施例中，进一步包括：保护壳体，用于容纳所述POE供电模块。
本申请的POE供电模块的电路结构简单，可省去外置MOS电路模块和光耦反馈电路模块，大大减小PCB布板面积，非常适合封装于线材中使用。
也就是说，本申请的POE供电模块，不需要在IPC的硬件中增加集成PD模块，以通过该PD模块将来自于以太网的POE信号分离为数据信号和电源信号。应用本申请的POE供电模块可以避免由于PD模块中集成的电路器件导致的IPC的制造成本增加的情况，并且，可以避免在硬件中增加集成PD模块，占用印刷电路板(Printed Circuit Board，简称PCB)的布板面积，导致IPC 体积增大的问题。
本申请的实施例在普通网口电源组合线束的输入和输出之间添加一定直径和长度的套筒，在套筒内添加可实现POE供电功能的电路板，线材线序完全兼容同款不带POE功能的网口电源组合线线序。
本申请的POE供电线缆可以直接应用在已开发成型的不支持POE的以太网客户端设备中，扩展其POE供电功能，从而实现产品线的扩展，节省二次开发成本，提升产品竞争力。
本申请的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本申请而了解。本申请的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
附图用来提供对本申请的进一步理解，并且构成说明书的一部分，与本申请的实施例共同用于解释本申请，并不构成对本申请的限制。在附图中：
图1是现有技术中网口电源线的结构示意图；
图2是本申请实施例一的POE供电线缆的结构示意图；
图3是本申请实施例一的POE供电模块的结构框图；
图4是本申请实施例二的直流转换单元的电路结构示意图。
具体实施方式
以下将结合附图及实施例来详细说明本申请的实施方式，借此对本申请如何应用技术手段来解决技术问题，并达成相应技术效果的实现过程能充分理解并据以实施。本申请实施例及实施例中的各个特征，在不相冲突的前提下可以相互结合，所形成的技术方案均在本申请的保护范围之内。
本申请提供一种内置POE供电模块的网口电源线，对不具备POE供电功能的以太网客户端扩展POE功能，不影响现有以太网客户端的主体硬件及结构。对于非POE以太网客户端，只需将现有的网口电源线替换为本申请提供的新型供电线缆，即可实现非POE客户端设备和POE客户端设备的切换。
也就是说，本申请所提供的一种POE供电模块可以内置于网口电源线， 该网口电源线可以是现有的任何一种网口电源线，在此不做赘述。
需要说明的是，本申请实施例中仅以网络摄像机IPC作为客户端设备的一个示例进行说明，不限于此，本实施例提供的新型供电线缆同样适用于POE系统的其他客户端设备，如IP电话、AP、掌上电脑(PDA)或者移动电话充电器等等。
实施例一
图2为本实施例的POE供电线缆的结构示意图。如图2所示，该线缆主要包括网络连接线缆210、POE供电模块220和PD设备连接线缆230。
本实施例中的供电线缆可在POE供电模式和非POE供电模式下使用。
POE供电模式
在POE供电模式下，网络连接线缆210与POE系统中的PSE设备连接，POE供电模块220从符合IEEE802.3af协议的POE信号中提取数据信号和直流电源信号，PD设备连接线缆230与PD设备连接，向PD设备提供直流电源。其中，PD设备为不支持IEEE802.3af协议的以太网客户端设备。
其中，该直流电源信号为POE供电模块220所包括的网络变压单元从POE信号中提取的交流信号经POE供电模块220所包括的整流单元、检测单元以及直流转换单元处理所得的直流信号。并且，PD设备连接线缆230与PD设备连接，通过该直流电源信号向PD设备提供直流电源。
图3为POE供电模块220的结构框图。如图3所示，POE供电模块220主要包括网络变压单元221、整流单元222、检测单元223和直流转换单元224。
网络变压单元221具有输入端221a，用于接收POE信号。网络变压单元221还设置有数据输出端221b和电源输出端221c。网络变压单元221将POE网络信号分解为数据信号和交流信号，并在数据输出端221b上输出数据信号，在电源输出端221c上输出交流信号AC。
整流单元222的输入端与网络变压单元221的电源输出端221c连接，用于对交流信号进行整流处理输出中间信号。例如图3中所示的DC 48V电压信号。
检测单元223与整流单元222的输出端连接，检测单元223根据中间信号产生反馈信号，将反馈信号通过网络变压单元传输至PSE设备，与PSE设 备进行握手。其中，反馈信号包括检测反馈信号和功率分级反馈信号。
具体来说，检测单元223与PSE设备进行握手的过程包括检测阶段和功率分级阶段。首先，在检测阶段中，检测单元223识别PSE设备输出的较小的电平信号，在该电平信号的作用下基于自身的特征电阻产生检测电流，将该检测电流作为检测反馈信号，以使PSE设备基于检测反馈信号将POE供电模块220识别为符合IEEE802.3af协议的合法的PD设备。随后，在功率分级阶段中，检测单元223在PSE设备输出的分级检测电平作用下产生特征电流，将该特征电流作为功率分级反馈信号，PSE设备基于功率分级反馈信号识别POE供电模块的功率等级。检测和分级完成后，POE供电模块220与PSE设备完成握手。在随后的供电过程中，PSE设备向PD设备提供48V的中间直流电源信号。
如图3所示，直流转换单元224具有输入端224a和输出端224b，直流转换单元的输入端224a与整流单元222的输出端连接。在检测单元223完成握手之后的供电过程中，直流转换单元224将整流单元222输出的48V中间直流电源信号转换为受电设备适用的12V直流信号，并在输出端224b上输出该直流信号。
在POE供电模式下，网络连接线缆210的一端连接网络变压单元221的输入端221a，另一端连接以太网适配模块210a，从而将PSE设备产生的POE信号传输至网络变压单元221，提取数据信号和直流电源信号。
也就是说，该PSE设备与该POE供电模块220的网络变压单元221通过网络连接线缆210相连，检测单元223将反馈信号通过网络变压单元221传输至PSE设备，与PSE设备进行握手。其中，该中间直流电源信号就是本申请实施例中所提到的中间信号。
以太网适配模块210a可为RJ45端口，其中的8根双绞线与网络连接线缆210中的8根双绞线一一对应地连接，并连接网络变压单元221的输入端221a，可以支持1、2、3、6数据线和4、5、7、8空闲线供电两种供电方式。
PD设备连接线缆230的一端连接网络变压单元221的数据输出端221b和直流转换单元的输出端224b，另一端连接PD设备接口模块230a，向PD设备提供数据信号和直流电源信号。
也就是说，PD设备的接口模块230a通过连接线缆230与该POE供电模块220网络变压单元221的数据输出端221b和直流转换单元的输出端224b相连接。
在一个优选的示例中，PD设备为网络摄像机IPC，其内设6芯线到板端插座(公头)，与其相应的，PD设备接口模块230a配置为6芯胶壳插座(母头)，具有D1至D6共6个连接端子。PD设备连接线缆230包括PD设备数据线和PD5设备电源线。其中，PD设备的数据线可包括4根双绞线，PD设备的数据线的一端连接网络变压单元的数据输出端221b，另一端连接PD设备接口模块230a的数据端子D1至D4。PD设备的电源线包括2根双绞线，PD设备的电源线的一端连接直流转换单元的输出端224b，另一端连接PD设备接口模块230a的电源端子D5至D6。从而将从POE信号中提取的数据信号通过数据端子D1至D4传输至PD设备，并将从POE信号中分解的直流电源信号通过电源端子D5至D6提供给PD设备。
非POE供电模式
再次回到图2，本实施例的POE供电线缆还包括辅助电源线240，连接外部12V直流电源，用于在非POE供电模式下为PD设备提供电源。
在非POE供电模式下，网络连接线缆210与不支持IEEE802.3af协议的以太网交换设备连接，POE供电模块210仅对数据信号进行转发。具体而言，网络变压单元221在数据输出端221b上输出数据信号，而在电源输出端221c上没有电源信号输出。这样，整流单元222、检测单元223和直流转换单元224并不工作，需要通过辅助电源线240为PD设备提供额外的直流电源。
相应地，如图3所示，POE供电模块220还包括辅助供电单元225，其输入端225a接收外部直流电源信号，输出端225b与直流转换单元的输出端224b连接。在图2中，辅助电源线240的一端连接辅助供电单元的输入端225a，另一端连接辅助电源端口，进而将外部直流电源信号传递至直流转换单元的输出端224b，并通过电源端子D5至D6提供给PD设备。
从上述技术方案可知，本实施例相当于借助POE供电模块将普通的网口电源线的功能进行了扩展，而且安装使用方便，不影响非POE客户端设备的硬件功能，同一客户端设备只需切换网口电源线物料就可以实现POE机型和 非POE机型的切换。
当网络输入不带POE功能的网络信号时，POE供电线缆对网络信号只是传递作用。当输入是带POE功能的网络信号时，POE供电线缆可输出DC12V和网络信号，从而可节省DC12V电源输入。另外，若POE网络信号和外部DC12V电源同时输入时，也不会造成任何干扰。
也就是说，该DC12V即为本实施例所提到的直流信号，该网络信号即为本实施例所提到的数据信号。
为了满足线材设计气密和防水性的需求，在POE供电线缆上设置保护壳体250用于容纳POE供电模块220。该保护壳体优选设计为圆筒形的套筒。该套筒长80mm，直径18.5mm，将POE供电模块220制造在一块小型电路板上，并设置在套筒250中。
实施例二
以下根据图4说明直流转换单元224的具体电路结构。直流转换单元包括反激式变压器410和开关电路420。开关电路420基于整流单元产生的中间信号生成开关信号，反激式变压器410在开关信号的作用下将中间直流电源信号转换为直流信号。
其中，该中间直流电源信号即为中间信号。
本实施例中提供的直流转换单元224的电路结构简单，可省去外置MOS电路模块、光耦反馈电路模块，大大减小PCB布板面积，非常适合封装于线材中使用。
如图4所示，反激式变压器410包括初级绕组、次级绕组和置于初级绕组一侧的辅助绕组。
初级绕组的输入端(2号端)配置为直流转换单元224的输入端Vi，连接至整流单元，接收整流单元产生的48V中间直流信号。初级绕组的输出端(1号端)连接开关电路420，根据开关信号来控制初级绕组上的电压，当该开关信号关闭时，一反激电压从初级绕组反射至次级绕组和辅助绕组。
其中，该48V中间直流信号即为中间直流电源信号(中间信号)。
次级绕组的一端(5号端)连接输出二极管DP1的阳极，输出二极管DP1 的阴极连接在直流转换单元224的输出端Vo。接次级绕组的另一端(6号端)连接输出电容CP4的一端，输出电容CP4的另一端连接输出二极管DP1的阴极。输出电容CP4用于对输出的12V直流电压进行滤波。
辅助绕组的一端(3号端)连接参考电平HGND，另一端(4号端)连接开关电路420，向开关电路提供反馈电压Vs。
在本实施例中，开关电路420由PWM(Pulse Width Modulation，脉冲宽度调制)控制器SY6177FAC及其外围电路实现。由于本申请的实施例中POE供电模块集成在供电线缆中，要求电路具有较高的集成度，占用更小的体积。而SY6177FAC中集成有PWM控制元件和MOS元件，并能简化外围电路。
具体来说，开关电路420主要包括PWM控制芯片(SY6177FAC)和过零检测电路。其中，PWM控制芯片内部集成PWM逻辑元件和开关晶体管(MOS管)，PWM逻辑元件输出脉冲宽度调制信号来驱动开关晶体管的栅极，开关晶体管的漏极产生开关信号，用于控制初级绕组产生脉冲电压，在次级绕组上激发幅值降低的脉冲电压，由滤波电路输出受电设备适用的低压直流电源信号。
也就是说，在图4中，整流单元产生的48V中间直流信号通过RP16连接SY6177FAC芯片的电源输入管脚(VIN)，形成电阻启动电路，可以在开始进行供电时，帮助SY6177FAC芯片的启动。CP17一端连接SY6177FAC芯片的电源输入管脚(VIN)，一端接地，可以起到稳定输入SY6177FAC芯片的电流的作用。
如图4所示，SY6177FAC芯片的输入管脚(DR)是片内MOS管的漏极，连接反激式变压器410初级绕组的输出端(1号端)。SY6177FAC采用输出电流原边调节技术，MOS管由内部PWM逻辑元件控制，在MOS管的漏极上产生开关信号。当MOS管导通时，初级绕组中有电流流过，当MOS管截止时，初级绕组的电流中断，从而控制初级绕组通断。PWM逻辑元件输出的脉冲宽度调制信号决定MOS管的导通时间长短。初级绕组产生脉冲电压，可激发次级绕组产生幅值降低的脉冲电压，该脉冲电压经过由输出电容CP4和二极管DP1组成的滤波电路进行滤波后，输出受电设备适用的低压12V直流电源信号。
SY6177FAC芯片的输出管脚(GND)接地(此处的地和反激式变压器次级绕组的地隔离)。
在图4中，RP11和RP14组成过零检测电路。过零检测电路中RP14的一端与RP11的一端共同连接SY6177FAC芯片的检测管脚(ZCS)，RP14的另一端接地(HGND)，RP11的另一端连接辅助绕组的4号端。
现有技术中的反激式变压器通常设置光耦反馈电路模块将次边绕组的输出电压反馈至PWM控制芯片，而本实施例中可省去光耦反馈电路模块，利用辅助绕组的电压实现过零检测，SY6177FAC芯片将辅助绕组电压Vs与内部基准电压进行比较，根据检测到的辅助绕组电压Vs调整脉冲宽度调制信号的占空比，以保持次边绕组输出的电压恒定。
此外，采样电阻RP12的一端与开关芯片的电流反馈管脚(ISEN)连接，另一端接地。PWM逻辑元件通过采样电阻RP12完成电流采样，调整PWM信号的占空比，并实现过流保护。
电阻RP10和电容CP12串联组成RC补偿电路，电阻RP10的一端与开关芯片的补偿管脚(COMP)连接，电容CP12连接GND。补偿回路用来稳定控制闭环，以实现快速瞬态响应。
在本实施例中，SY6177FAC是一个可增强反激式变压器性能的PWM控制器。该芯片内部集成了一个200V耐压的三极管(MOSFET)，无需外接MOS管，节省了开关电路420的物理体积。SY6177FAC通过原边控制技术调整电压和电流，适合低成本的应用。为了达到更高的效率和更好的EMI性能，SY6177FAC驱动反激式变压器410工作在准谐振状态。
由以上方案可看出，SY6177FAC方案电路结构简单，可省去外置MOS电路模块、光耦反馈电路模块，节省了体积和资源，大大减小PCB布板面积。
任何本申请所属技术领域内的技术人员，在不脱离本申请所公开的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本申请的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (13)

  1. 一种POE供电模块，包括：
    网络变压单元，将POE网络信号分解为数据信号和交流信号；
    整流单元，对所述交流信号进行整流输出中间信号；
    检测单元，根据所述中间信号产生反馈信号，将所述反馈信号通过网络变压单元传输至PSE设备，以使得检测单元与PSE设备进行握手；
    直流转换单元，在握手完成之后将所述中间信号转换为受电设备适用的直流信号。
  2. 如权利要求1所述的POE供电模块，其特征在于，还包括：
    辅助供电单元，其输入端接收外部直流电源信号，输出端与直流转换单元的输出端连接，以将外部直流电源信号传递至直流转换单元的输出端。
  3. 如权利要求1或2所述的POE供电模块，其特征在于，所述直流转换单元包括：
    开关电路，基于中间信号生成开关信号；
    反激式变压器，在开关信号的作用下将所述中间信号转换为所述直流信号。
  4. 如权利要求3所述的POE供电模块，其特征在于，
    所述反激式变压器包括初级绕组、次级绕组和设置于初级绕组一侧的辅助绕组；
    所述开关电路包括PWM控制芯片和过零检测电路；
    其中，PWM控制芯片内部集成PWM逻辑元件和开关晶体管，PWM逻辑元件输出脉冲宽度调制信号来驱动开关晶体管的栅极，开关晶体管的漏极产生开关信号，初级绕组根据所述开关信号产生脉冲电压，从而在次级绕组上激发幅值降低的脉冲电压，进而对幅值降低的脉冲电压进行滤波输出所述直流信号；
    过零检测电路的一端连接辅助绕组，另一端连接PWM控制芯片的检测管脚，PWM控制芯片根据检测到的辅助绕组电压调整脉冲宽度调制信号的占空比。
  5. 如权利要求1所述的POE供电模块，其特征在于，所述反馈信号包括 检测反馈信号和功率分级反馈信号，检测单元与PSE设备进行握手的过程包括检测阶段和功率分级阶段；
    其中，在检测阶段中，检测单元对所述中间信号产生的检测电流作为检测反馈信号，PSE设备基于所述检测反馈信号将POE供电模块识别为符合IEEE802.3af协议的合法设备；
    在功率分级阶段中，检测单元对所述中间信号产生的特征电流作为功率分级反馈信号，PSE设备基于所述功率分级反馈信号识别POE供电模块的功率等级。
  6. 一种POE供电线缆，包括：
    POE供电模块，其设置在所述POE供电线缆内，所述POE供电模块包括：网络变压单元，将POE网络信号分解为数据信号和交流信号；整流单元，对所述交流信号进行整流输出中间信号；检测单元，根据所述中间信号产生反馈信号，将所述反馈信号通过网络变压单元传输至PSE设备，以使得检测单元与PSE设备进行握手；直流转换单元，在握手完成之后将所述中间信号转换为受电设备适用的直流信号；
    网络连接线缆，其一端连接所述网络变压单元的输入端，另一端连接以太网适配模块；
    PD设备连接线缆，其一端连接所述网络变压单元的数据输出端和所述直流转换单元的输出端，另一端连接PD设备接口模块。
  7. 如权利要求6所述的POE供电线缆，其特征在于，所述PD设备连接线缆包括：
    PD设备数据线，其一端连接所述网络变压单元的数据信号输出端，另一端连接PD设备接口模块的数据端子；
    PD设备电源线，其一端连接所述直流转换单元的输出端，另一端连接PD设备接口模块的电源端子。
  8. 如权利要求7所述的POE供电线缆，其特征在于，所述POE供电模块还包括：
    辅助供电单元，其输入端接收外部直流电源信号，输出端与直流转换单元的输出端连接，以将外部直流电源信号传递至直流转换单元的输出端。
  9. 如权利要求8所述的POE供电线缆，其特征在于，进一步包括：
    辅助电源线，其一端连接所述辅助供电单元的输入端，另一端连接辅助电源端口。
  10. 如权利要求6-9中任一项所述的POE供电线缆，其特征在于，所述直流转换单元包括：
    开关电路，基于中间信号生成开关信号；
    反激式变压器，在开关信号的作用下将所述中间信号转换为所述直流信号。
  11. 如权利要求10所述的POE供电线缆，其特征在于，
    所述反激式变压器包括初级绕组、次级绕组和设置于初级绕组一侧的辅助绕组；
    所述开关电路包括PWM控制芯片和过零检测电路；
    其中，PWM控制芯片内部集成PWM逻辑元件和开关晶体管，PWM逻辑元件输出脉冲宽度调制信号来驱动开关晶体管的栅极，开关晶体管的漏极产生开关信号，初级绕组根据所述开关信号产生脉冲电压，从而在次级绕组上激发幅值降低的脉冲电压，进而对幅值降低的脉冲电压进行滤波输出所述直流信号；
    过零检测电路的一端连接辅助绕组，另一端连接PWM控制芯片的检测管脚，PWM控制芯片根据检测到的辅助绕组电压调整脉冲宽度调制信号的占空比。
  12. 如权利要求6所述的POE供电线缆，其特征在于，所述反馈信号包括检测反馈信号和功率分级反馈信号，检测单元与PSE设备进行握手的过程包括检测阶段和功率分级阶段；
    其中，在检测阶段中，检测单元对所述中间信号产生的检测电流作为检测反馈信号，PSE设备基于所述检测反馈信号将POE供电模块识别为符合IEEE802.3af协议的合法设备；
    在功率分级阶段中，检测单元对所述中间信号产生的特征电流作为功率分级反馈信号，PSE设备基于所述功率分级反馈信号识别POE供电模块的功率等级。
  13. 如权利要求6所述的POE供电线缆，其特征在于，进一步包括：保护壳体，用于容纳所述POE供电模块。
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