CN219627727U - Photoelectric converter supporting PoE output - Google Patents

Abstract

The utility model relates to the technical field of photoelectric converters, in particular to a photoelectric converter supporting PoE output, which comprises a photoelectric conversion circuit and a PoE output circuit, wherein the photoelectric conversion circuit comprises a photoelectric conversion module, a light signal transmission module and an electric signal transmission module, the electric signal transmission module comprises a network transformer X1 and an electric network interface, and the PoE output circuit comprises a PoE controller U5, an external power supply conversion module and an internal power supply conversion module. The photoelectric converter supporting PoE output has the functions of PoE power supply and photoelectric signal conversion, can supply power to external PD equipment through a PoE output circuit, and can convert electric signals and optical signals through a photoelectric conversion circuit, and the application range is wider.

Description

Photoelectric converter supporting PoE output

Technical Field

The utility model relates to the technical field of photoelectric converters, in particular to a photoelectric converter supporting PoE output.

Background

The photoelectric converter is a device for converting photoelectric signals commonly used at present, can realize the functions of photoelectric signal conversion, transmission, power supply and the like of the switch by being combined with a common switch, is far cheaper than using optical port switches in price, and particularly, some optical port switches lose one or even a plurality of electric ports after an optical module is inserted, and in turn, when the optical port switches are used, more switches are needed, so that the requirement of external power supply can be met. Therefore, the combined use of the photoelectric converter and the common switch is a popular use mode at present.

However, the current photoelectric converter has a single application scenario, can only transmit data, is combined with a common switch, can only transmit data, and can not supply power to a back-end device, such as the optical fiber converter disclosed in patent CN202110776869.5, if a PD device needing power supply is encountered, the photoelectric converter needs to be combined with a PoE switch to supply power, that is, when different external devices are faced, different switch types need to be selected to meet different requirements, so that the photoelectric converter capable of only transmitting data has a large limitation.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides the photoelectric converter supporting PoE output, which not only can realize the conversion of photoelectric signals, but also can supply power for external PD equipment, and has wider application prospect.

In order to solve the technical problems, the utility model adopts the following technical scheme: a photoelectric converter supporting PoE output, comprising a photoelectric conversion circuit and a PoE output circuit, wherein the photoelectric conversion circuit comprises a photoelectric conversion module, an optical signal transmission module and an electric signal transmission module, the electric signal transmission module comprises a network transformer X1 and an electric network interface, and the PoE output circuit comprises a PoE controller U5, an external power supply conversion module and an internal power supply conversion module;

the external power supply outputs voltage to the power supply end of the PoE controller U5 after being reduced by the external power supply conversion module, the output end of the external power supply conversion module is connected with the input end of the internal power supply conversion module, the internal power supply conversion module outputs the received voltage to the working voltage end of the PoE controller U5 after reducing the voltage, the load detection end of the PoE controller U5 is connected with the network transformer X1, and the network transformer X1 is connected with external PD equipment through the electric network interface J1;

the network transformer X1 and the optical signal transmission module are both in signal connection with the photoelectric conversion module, and the photoelectric conversion module is used for converting optical signals and electric signals.

Preferably, the photoelectric conversion module comprises a photoelectric controller U3, the chip model of the photoelectric controller U3 is RTL8213B, the photoelectric controller U3 is provided with an SGMII interface, and the optical signal transmission module is connected with the photoelectric controller U3 through the SGMII interface.

Preferably, the chip model of the PoE controller U5 is RTL8239.

Preferably, a plurality of PoE controllers U5 are provided, the PoE power supply circuit further includes a power management controller U7, and a plurality of PoE controllers U5 are cascaded and are all in signal connection with the power management controller U7.

Preferably, the chip type of the power management controller U7 is SH79F6441.

Preferably, the external power supply conversion module includes an input interface JE1, a common-mode inductor LF1, a resistor R3, a resistor R4, a resistor R5, a resistor R8, a resistor R9, a switching tube Q1, and a switching tube Q2, where the input interface JE1 is connected to an input end of the common-mode inductor LF1, an output end of the common-mode inductor LF1 is connected to a power supply end of the PoE controller U5, another output end of the common-mode inductor LF1 is connected to a switching end of the switching tube Q2, another switching end of the switching tube Q2 is grounded, one end of the resistor R4 is connected to an output end of the common-mode inductor LF1, another end of the resistor R4 is connected to one end of the resistor R8 through one end of the resistor R5, another end of the resistor R8 is grounded, another end of the resistor R5 is connected to a control end of the switching tube Q1, another output end of the switching tube Q1 is connected to one output end of the common-mode inductor LF1 through the resistor R3, another output end of the switching tube Q1 is connected to one end of the switching tube Q2.

Preferably, the external power supply conversion module further includes a zener diode D10, a zener diode D11, a capacitor C48, a capacitor C49, and a resistor R54, where the output end of the common-mode inductor LF1 is connected to the power supply end of the PoE controller U5 after passing through the zener diode D10 and the resistor R54 in sequence, the cathode of the zener diode D11 is connected to the anode of the zener diode D10, the anode of the zener diode D11 is grounded, and both the capacitor C48 and the capacitor C49 are connected in parallel to the zener diode D11.

Preferably, the internal power supply conversion module comprises a voltage reducer U1, a resistor R13, a resistor R14, a capacitor C2 and an inductor L1, wherein the input end of the voltage reducer U1 is connected with the output end of the external power supply conversion module, the output end of the voltage reducer U1 is sequentially connected with the PoE controller U5 after passing through the capacitor C2 and the inductor L1, one end of the resistor R13 is connected with the inductor L1, the other end of the resistor R13 is grounded through the resistor R14, and the feedback end of the voltage reducer U1 is connected with the other end of the resistor R13.

Preferably, the optical signal transmission module includes an SFP interface unit U4, a resistor R52, a resistor R53, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a capacitor C42, and a capacitor C43, where two SGMII interfaces of the optical controller U3 are connected to the SFP interface unit U4 through the capacitor C38 and the capacitor C39, respectively, an output end of the internal power supply conversion module is connected to a power supply end of the SFP interface unit U4 through the resistor R52, and an output end of the internal power supply conversion module is connected to another power supply end of the SFP interface unit U4 through the resistor R53, one end of the capacitor C40 is grounded, the other end of the capacitor C40 is connected to the resistor R52, the capacitor C41 is connected to the capacitor C40 in parallel, one end of the capacitor C42 is grounded, the other end of the capacitor C42 is connected to the resistor R53, and the capacitor C43 is connected to the capacitor C42 in parallel.

Preferably, the photovoltaic converter supporting PoE output further comprises an LED prompt module, and the LED prompt module is in signal connection with the photovoltaic conversion module.

The utility model has the beneficial effects that:

1. the photoelectric conversion circuit realizes the function of photoelectric signal conversion, external PD equipment is connected through an electric network interface J1, electric signals are transmitted to the photoelectric conversion module through a network transformer X1, the signals are converted and transmitted to the optical signal transmission module through the photoelectric conversion module, and the optical signal transmission module transmits optical signals to the external equipment;

2. the PoE output circuit realizes the function of supplying power to external equipment, and the external power supply is converted into the power supply of PoE through an external power supply conversion module, and then the PoE output circuit supplies power to the external equipment after passing through a PoE controller U5, a network transformer X1 and an electric network interface J1, so that the function of supplying power to PoE is realized while photoelectric signal conversion is realized.

Drawings

FIG. 1 is a signal block diagram of the present utility model;

fig. 2 is a schematic circuit diagram of the photoelectric converter U3 of the present utility model;

FIG. 3 is a schematic circuit diagram of an optical signal transmission module according to the present utility model;

fig. 4 is a schematic circuit diagram of a network transformer X1 according to the present utility model;

FIG. 5 is a schematic circuit diagram of an electrical network decoupling J1 of the present utility model;

fig. 6 is a schematic circuit diagram of a PoE controller U5 of the present utility model;

FIG. 7 is a schematic circuit diagram of a power management controller U7 according to the present utility model;

FIG. 8 is a schematic circuit diagram of an external power conversion module according to the present utility model;

FIG. 9 is a schematic circuit diagram of an internal power conversion module of the present utility model;

fig. 10 is a schematic circuit diagram of the LED alert module of the present utility model.

Detailed Description

The utility model will be further described with reference to examples and drawings, to which reference is made, but which are not intended to limit the scope of the utility model. The present utility model will be described in detail below with reference to the accompanying drawings.

The embodiment provides a supporting PoE output photoelectric converter, as shown in fig. 1, including a photoelectric conversion circuit and a PoE output circuit, where the photoelectric conversion circuit includes a photoelectric conversion module, a light signal transmission module and an electrical signal transmission module, the electrical signal transmission module includes a network transformer X1 and an electrical network interface J1, such as an RJ45 interface in the prior art, and the PoE output circuit includes a PoE controller U5, an external power conversion module and an internal power conversion module.

The signal transmission line of the power supply function is: the external power supply outputs voltage to the power end of the PoE controller U5 after being reduced by the external power supply conversion module, the output end of the external power supply conversion module is connected with the input end of the internal power supply conversion module, the internal power supply conversion module outputs the received voltage to the working voltage end of the PoE controller U5 after reducing the voltage, the load detection end of the PoE controller U5 is connected with the network transformer X1, and the network transformer X1 is connected with external PD equipment through the electric network interface J1. Specifically, as shown in fig. 4-9, the external power source steps down via the external power supply conversion module to output a voltage VMAIN, for example, 54V, which is a source that can be used by the PoE controller U5 to supply power to the external device, and after the voltage step down by the internal power supply conversion module, outputs a voltage VDD33, for example, 3.3V, so as to be used as a working voltage of the PoE controller U5 and other chips, and the PoE controller U5 can supply power to the external device via the network transformer X1 and the network interface J1 after detecting the type of the external device connected to the network transformer X1 is met.

The external power supply conversion module comprises an input interface JE1, a common-mode inductor LF1, a resistor R3, a resistor R4, a resistor R5, a resistor R8, a resistor R9, a switch tube Q1 and a switch tube Q2, and a specific circuit connection mode is shown in fig. 8, and can provide a 54V power supply voltage, and the external power supply conversion module also comprises a voltage stabilizing diode D10, a voltage stabilizing diode D11, a capacitor C48, a capacitor C49 and a resistor R54, so that corresponding filtering and other works can be performed before VMAIN is input into a PoE controller U5, and stable power supply is ensured to be provided for back-end equipment.

The internal power conversion module of the embodiment includes a voltage reducer U1, a resistor R13, a resistor R14, a capacitor C2, and an inductor L1, and a specific circuit connection manner is shown in fig. 9, and can provide 3.3V of working voltage for chips such as a PoE controller U5.

The PoE controller U5 of the present embodiment preferably employs a chip RTL8239, and the PoE controller U5 (bit number U5) RTL8239 is a highly integrated eight-edge Power Sourcing Equipment (PSE) controller designed to implement a more economical ethernet power (PoE) system in mid-span and endpoint PSE applications, allowing network devices to share power and data over the same cable. The RTL8239 satisfies all requirements of IEEE 802.3AF-2003, 802.3AT-2009, and 802.3BT-2018, including resistance detection, connection checking, PD classification, power-up, and dc-off, supporting 8 independent 2-pair power interfaces or 4 independent 4-pair interfaces. It also supports standard Type-1/Type-2/Type-3/Type4 PD according to IEEE standard, as well as legacy/pre-standard PD (power plant). With 8 low rds (on), the RTL8239 device may drive 8 separate 2 pairs of power ports, each providing a maximum of 50W, or 4 separate 4 pairs of power ports, each providing a maximum of 100W. RTL8239 provides PD real-time current, voltage, thermal monitoring, and excellent protection in the chip against overloads, shorts, undervoltages, and overtemperatures, as specified by the IEEE 802.3af-2003, 802.3AT-2009, and 802.3BT-2018 standards. Multiple RTLs 8239 may be cascaded to form a PSE system, and an external low-cost MCU, such as the power management controller U7 shown in fig. 7, optionally model SH79F6441, may construct a network Link Layer Discovery Protocol (LLDP) to provide efficient real-time dynamic power management. And has an embedded 3.3V-1.8V Low Dropout regulator (LDO) to further reduce power circuit cost. While providing up to 90W power capability for the back end and being compatible with all PD classes on the market.

In this embodiment, as shown in fig. 4 and 6, PIN10 and PIN12 of PoE controller U5 are used as negative electrode to detect, PIN24 and PIN15 of network transformer X1 are connected, PIN1/PIN2/PIN7/PIN8 of RJ45 terminal J1 shown in fig. 5 is connected to a back-end PD device through a network cable, VMAIN whose positive electrode is directly output by an external power supply conversion module is connected to PIN18 and PIN21 of network transformer X1, PIN3/PIN6/PIN4/PIN5 of RJ45 terminal J1 is connected to a back-end PD device through a network cable, and after power is applied, poE controller U5 scans each (power supply enabled) port at regular time, and the scanning purpose is to detect whether the port is connected to the device. Only when a port is detected to be connected with the device, the chip can enter the next operation, namely the device identification.

1. Detection voltage: 2.8V-10V, scanned to standard PD conditions: characteristic resistance 19kohm-26.5kohm characteristic capacitance: less than 150nF.

2. Identification device

The standard PD devices all have a characteristic resistance, the resistance value of which is within a prescribed range, and the PoE controller U5 determines whether the device to which the port is connected is a standard PD device by detecting whether the magnitude of the resistance is within a prescribed range. Upon identifying that the connected device is a standard PD device, poE controller U5 will proceed to the next operation-identifying the PD type.

3. Identifying PD types

According to PoE standards, PD devices can be classified into classes 0-4. Each PD device has a Class resistance, and the PoE standard specifies Class1 to Class4 PD devices having Class resistances in4 different ranges, respectively, and if the Class resistance is no longer within the 4 ranges, the PD is identified as a Class0 device. The class detection voltage is 14.5V-20.5V, and the PoE controller U5 can easily identify the type of the PD equipment by detecting the current, so that the characteristic resistance can be changed to obtain different current values. The representation is: a non-PoE device, such as a NIC, having a termination impedance of 150 ohms, is not determined to be a PD.

4. Power supply

After the PoE controller U5 performs the "identify PD type" operation, the PoE controller U5 powers the port, which is a process in which the PoE controller U5 automatically shuts off the power to the port with little power initially and gradually increasing until the PD device needs are met, where the PD device may need more power than the PoE power supply circuit can provide. When a port is powered, the PoE controller U5 also performs a series of tests, i.e. tests in the power supply, periodically after entering the power supply normal state.

5. Detection in power supply

After the power supply is normal, poE can detect the following at regular time:

a) Overcurrent protection

The chip support user sets different maximum allowable current values corresponding to different ports, and when the actual current exceeds the maximum value, the PoE controller U5 automatically turns off the power supply to the ports. At the same time, the chip will record the power-off reason in a status register for the user to read.

b) Power management

In normal power engineering, the total power consumption of the PD devices connected to each port may exceed the NoConnect limit, at which time the system will not power the new devices; if the total power consumed by the PD devices exceeds the maximum allowed power of the PoE power circuitry, the PoE controller U5 can automatically turn off certain low priority ports at this time.

c) Disconnection detection

By means of the disconnection detection, poE can identify which ports connected PD devices have been disconnected. The disconnection test mode is classified into two types, DC and AC. DC is used for judging whether the PD equipment is disconnected or not by detecting current, and is the same as a PD grading method; the AC disconnection detection is to add an AC component (sine wave) into DC (generated by the crystal inside the chip), wherein the amplitude of the AC component can change along with the size of the load, and the amplitude is large, small and large, and whether the disconnection is performed is determined by comparing the amplitude with a preset threshold.

As shown in fig. 1, the transmission line for photoelectric signal conversion in the present embodiment is: the external equipment a is connected with the network transformer X1 through the electric network interface J1, the external equipment b is connected with the optical signal transmission module, the network transformer X1 and the optical signal transmission module are both in signal connection with the photoelectric conversion module, and the conversion of optical signals and electric signals is realized through the photoelectric conversion module.

As shown in fig. 2 and fig. 3, the photoelectric conversion module 1 includes a photoelectric controller U3, a chip model of the photoelectric controller U3 is RTL8213B, the photoelectric controller U3 is provided with a plurality of SGMII interfaces, the RTL8213B is a QFN40 high-performance media converter, and has a low-power consumption integrated single-port function, and supports an integrated single-port 10/100/1000Base-T PHY and SGMII (1.25 Gbps) Interface, so that the optical signal transmission module is connected with the photoelectric controller U3 through the SGMII Interface, so that the optical signal transmission module is convenient for a user to select, and can arbitrarily select various optical modules, such as the optical signal transmission module adopted in this embodiment, the optical signal transmission module includes an SFP Interface unit U4, a resistor R52, a resistor R53, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a capacitor C42 and a capacitor C43, and the specific connection manner is shown in fig. 3. Of course, the SC optical module may also be used in this embodiment, which is not limited.

Specifically, as shown in fig. 2 to 5, the photoelectric controller U3 is connected to the network transformer X1 through PINs PIN36/PIN37/PIN38/PIN39/PIN1/PIN2/PIN3/PIN4 thereof, the network transformer X1 is connected to an RJ45 electric port, and the SGMII interface of the photoelectric controller U3 is connected to the SFP interface unit U4 of the optical signal transmission module through PINs 9/PIN10/PIN12/PIN13, respectively, so as to convert the electrical signal to be transmitted into the optical signal and transmit the optical signal, and meanwhile, the received optical signal can be converted into the electrical signal and input to the receiving end of us.

Further, in this embodiment, an LED prompt module is further provided, and the LED prompt module is in signal connection with the photoelectric conversion module, as shown in fig. 10, so that a user can conveniently know the current working condition.

Therefore, the photoelectric converter of the embodiment has the functions of PoE power supply and photoelectric signal conversion, can supply power to external PD equipment through the PoE output circuit, and can convert electric signals and optical signals through the photoelectric conversion circuit, so that the application range is wider. In addition, the photoelectric converter of the embodiment is assembled on a common switch, so that the cost of using the optical port switch can be saved, the optical port switch has a function similar to that of the optical port switch, and the equipment of different manufacturers of the photoelectric converter has no problem in interconnection and intercommunication, so that once damaged, the photoelectric converter can be replaced by products of other manufacturers, and the maintenance is more convenient.

The present utility model is not limited to the preferred embodiments, but is intended to be limited to the following description, and any modifications, equivalent changes and variations in light of the above-described embodiments will be apparent to those skilled in the art without departing from the scope of the present utility model.

Claims (10)

1. A photoelectric converter supporting PoE output, characterized by: the PoE output circuit comprises a PoE controller U5, an external power supply conversion module and an internal power supply conversion module;

the external power supply outputs voltage to the power supply end of the PoE controller U5 after being reduced by the external power supply conversion module, the output end of the external power supply conversion module is connected with the input end of the internal power supply conversion module, the internal power supply conversion module outputs the received voltage to the working voltage end of the PoE controller U5 after reducing the voltage, the load detection end of the PoE controller U5 is connected with the network transformer X1, and the network transformer X1 is connected with external PD equipment through the electric network interface J1;

the network transformer X1 and the optical signal transmission module are both in signal connection with the photoelectric conversion module, and the photoelectric conversion module is used for converting optical signals and electric signals.

2. A photoelectric converter supporting PoE output according to claim 1, wherein: the photoelectric conversion module comprises a photoelectric controller U3, the chip model of the photoelectric controller U3 is RTL8213B, the photoelectric controller U3 is provided with an SGMII interface, and the optical signal transmission module is connected with the photoelectric controller U3 through the SGMII interface.

3. A photoelectric converter supporting PoE output according to claim 1, wherein: the chip model of the PoE controller U5 is RTL8239.

4. A photoelectric converter supporting PoE output according to claim 1, wherein: the PoE power supply circuit further comprises a power management controller U7, and the PoE controllers U5 are cascaded and are connected with the power management controller U7 in a signal mode.

5. A photoelectric converter supporting PoE output according to claim 4, wherein: the chip model of the power management controller U7 is SH79F6441.

6. A photoelectric converter supporting PoE output according to claim 1, wherein: the external power supply conversion module comprises an input interface JE1, a common-mode inductor LF1, a resistor R3, a resistor R4, a resistor R5, a resistor R8, a resistor R9, a switch tube Q1 and a switch tube Q2, wherein the input interface JE1 is connected with the input end of the common-mode inductor LF1, one output end of the common-mode inductor LF1 is used for being connected with the power end of a PoE controller U5, the other output end of the common-mode inductor LF1 is connected with one switch end of the switch tube Q2, the other switch end of the switch tube Q2 is grounded, one end of the resistor R4 is connected with one output end of the common-mode inductor LF1, one end of the resistor R4 is connected with one end of the resistor R8, the other end of the resistor R8 is grounded, the other end of the resistor R5 is connected with the control end of the switch tube Q1, one switch end of the switch tube Q1 is connected with one output end of the common-mode inductor LF1 through the resistor R3, the other output end of the switch tube Q1 is connected with one end of the switch tube Q9 through the control end of the switch tube Q2.

7. A photoelectric converter supporting PoE output according to claim 6, wherein: the external power supply conversion module further comprises a voltage stabilizing diode D10, a voltage stabilizing diode D11, a capacitor C48, a capacitor C49 and a resistor R54, wherein the output end of the common mode inductor LF1 sequentially passes through the voltage stabilizing diode D10 and the resistor R54 and then is connected with the power end of the PoE controller U5, the cathode of the voltage stabilizing diode D11 is connected with the anode of the voltage stabilizing diode D10, the anode of the voltage stabilizing diode D11 is grounded, and the capacitor C48 and the capacitor C49 are connected with the voltage stabilizing diode D11 in parallel.

8. A photoelectric converter supporting PoE output according to claim 1, wherein: the internal power supply conversion module comprises a voltage reducer U1, a resistor R13, a resistor R14, a capacitor C2 and an inductor L1, wherein the input end of the voltage reducer U1 is connected with the output end of the external power supply conversion module, the output end of the voltage reducer U1 is sequentially connected with a PoE controller U5 after passing through the capacitor C2 and the inductor L1, one end of the resistor R13 is connected with the inductor L1, the other end of the resistor R13 is grounded through the resistor R14, and the feedback end of the voltage reducer U1 is connected with the other end of the resistor R13.

9. A photoelectric converter supporting PoE output according to claim 2, wherein: the optical signal transmission module comprises an SFP interface unit U4, a resistor R52, a resistor R53, a capacitor C38, a capacitor C39, a capacitor C40, a capacitor C41, a capacitor C42 and a capacitor C43, wherein two SGMII interfaces of the photoelectric controller U3 are respectively connected with the SFP interface unit U4 through the capacitor C38 and the capacitor C39, the output end of the internal power supply conversion module is connected with one power supply end of the SFP interface unit U4 through the resistor R52, the output end of the internal power supply conversion module is connected with the other power supply end of the SFP interface unit U4 through the resistor R53, one end of the capacitor C40 is grounded, the other end of the capacitor C40 is connected with the resistor R52, the capacitor C41 is connected with the capacitor C40 in parallel, one end of the capacitor C42 is grounded, the other end of the capacitor C42 is connected with the resistor R53, and the capacitor C43 is connected with the capacitor C42 in parallel.

10. A photoelectric converter supporting PoE output according to claim 1, wherein: the photoelectric converter supporting PoE output further comprises an LED prompt module, and the LED prompt module is in signal connection with the photoelectric conversion module.