CN211579987U - Communication equipment based on POE interface - Google Patents
Communication equipment based on POE interface Download PDFInfo
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- CN211579987U CN211579987U CN202020547747.XU CN202020547747U CN211579987U CN 211579987 U CN211579987 U CN 211579987U CN 202020547747 U CN202020547747 U CN 202020547747U CN 211579987 U CN211579987 U CN 211579987U
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Abstract
The utility model discloses a communications facilities based on POE interface, first POE interface respectively with two public ends of first relay, two public end electricity connections of second relay, two normally closed contacts of first relay and two normally closed contacts of second relay are connected with four input electricity of first rectifier bridge circuit respectively, first PSE circuit port is connected with two normally open contacts of first relay and two normally open contacts of second relay electricity respectively, first voltage detection circuit is used for exporting first control signal to first switching circuit when detecting first rectifier bridge circuit output preset voltage, first switching circuit is used for driving when receiving first control signal the public end of third relay and fourth relay switches to normally open contact from normally closed contact. Compared with the prior art, the utility model provides a POE interface is more nimble among the communications facilities, can switch between PD mode and PSE mode.
Description
Technical Field
The utility model relates to a communication field, in particular to communications facilities based on POE interface.
Background
With the development of the internet/internet of things, communication equipment is continuously updated and updated, and the demand is continuously increased. In the installation project of the communication equipment, the design selection of the power supply mode of the communication equipment and the route planning are important parts in the whole project work. The POE (Power Over Ethernet) interface is adopted to supply Power, so that the complexity and difficulty of project installation can be greatly reduced, and the workload of project engineering is reduced. However, communication devices that can provide POE interfaces for Power reception are all fixed PD (Power Device) Power receiving interfaces or PSE (Power Sourcing Equipment) Power supplying interfaces in the market, and such design greatly limits the selectivity of interfaces during installation.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a communications facilities based on POE interface in order to overcome the above-mentioned defect among the prior art.
The utility model discloses a solve above-mentioned technical problem through following technical scheme:
a communication equipment based on POE interface includes:
the power supply circuit comprises a first POE interface, a first relay, a second relay, a first PSE circuit port, a first rectifier bridge circuit, a first voltage detection circuit, a first switching circuit, a second POE interface, a third relay, a fourth relay, a second PSE circuit port, a second rectifier bridge circuit, a second voltage detection circuit, a second switching circuit and a PD circuit;
the first POE interface is respectively and electrically connected with two public ends of a first relay and two public ends of a second relay, two normally closed contacts of the first relay and two normally closed contacts of the second relay are respectively and electrically connected with four input ends of a first rectifier bridge circuit, a port of the first PSE circuit is respectively and electrically connected with two normally open contacts of the first relay and two normally open contacts of the second relay, a first voltage detection circuit is used for outputting a first control signal to a first switching circuit when detecting that the first rectifier bridge circuit outputs preset voltage, and the first switching circuit is used for driving the public ends of a third relay and a fourth relay to be switched from the normally closed contacts to the normally open contacts when receiving the first control signal;
the second POE interface is respectively and electrically connected with two public ends of a third relay and two public ends of a fourth relay, two normally closed contacts of the third relay and two normally closed contacts of the fourth relay are respectively and electrically connected with four input ends of a second rectifier bridge circuit, a port of a second PSE circuit is respectively and electrically connected with two normally open contacts of the third relay and two normally open contacts of the fourth relay, a second voltage detection circuit is used for outputting a second control signal to a second switching circuit when detecting that the second rectifier bridge circuit outputs preset voltage, and the second switching circuit is used for driving the public ends of the first relay and the second relay to be switched from the normally closed contacts to the normally open contacts when receiving the second control signal;
and the output ends of the first rectifier bridge circuit and the second rectifier bridge circuit are connected with the power supply end of the PD circuit.
Preferably, the communication device further comprises a first diode connected in series between the output terminal of the first rectifier bridge circuit and the power supply terminal of the PD circuit;
the communication equipment further comprises a second diode which is connected in series between the output end of the second rectifier bridge circuit and the power supply end of the PD circuit.
Preferably, a first optical coupler is arranged between the first switching circuit and the first voltage detection circuit, and a second optical coupler is arranged between the second switching circuit and the second voltage detection circuit.
Preferably, the first rectifier bridge circuit comprises a first rectifier bridge and a second rectifier bridge, two normally closed contacts of the first relay are respectively connected with two input ends of the first rectifier bridge, and two normally closed contacts of the second relay are respectively connected with two input ends of the second rectifier bridge;
the second rectifier bridge circuit comprises a third rectifier bridge and a fourth rectifier bridge, two normally closed contacts of the third relay are respectively connected with two input ends of the third rectifier bridge, and two normally closed contacts of the fourth relay are respectively connected with two input ends of the fourth rectifier bridge.
Preferably, the first voltage detection circuit includes a first capacitor and a second capacitor, the first capacitor is connected in series between the input end and the output end of the first rectifier bridge, and the second capacitor is connected in series between the input end and the output end of the second rectifier bridge;
the second voltage detection circuit comprises a third capacitor and a fourth capacitor, the third capacitor is connected in series between the input end and the output end of the third rectifier bridge, and the fourth capacitor is connected in series between the input end and the output end of the fourth rectifier bridge.
Preferably, the output end of the first rectifier bridge, the output end of the second rectifier bridge and the output end of the first voltage detection circuit are electrically connected;
and the output end of the third rectifier bridge, the output end of the fourth rectifier bridge and the output end of the second voltage detection circuit are electrically connected.
Preferably, the communication device further includes a third POE interface, a fifth relay, a sixth relay, a third PSE circuit port, a third rectifier bridge circuit, a third voltage detection circuit, and a third switching circuit;
the third POE interface is respectively and electrically connected with two public ends of a fifth relay and two public ends of a sixth relay, two normally closed contacts of the fifth relay and two normally closed contacts of the sixth relay are respectively and electrically connected with four input ends of a third rectifier bridge circuit, a port of the third PSE circuit is respectively and electrically connected with two normally open contacts of the first relay and two normally open contacts of the second relay, and the third voltage detection circuit is used for outputting a third control signal to the third switching circuit when detecting that the third rectifier bridge circuit outputs a preset voltage;
the first switching circuit is used for driving the common ends of the third relay, the fourth relay, the fifth relay and the sixth relay to be switched from the normally closed contact to the normally open contact when receiving a first control signal;
the second switching circuit is used for driving the common ends of the first relay, the second relay, the fifth relay and the sixth relay to be switched from the normally closed contact to the normally open contact when receiving a second control signal;
the third switching circuit is used for driving the common end of the first relay, the second relay, the third relay and the fourth relay to be switched from the normally closed contact to the normally open contact when receiving a third control signal;
and the output end of the third rectifier bridge circuit is connected with the power supply end of the PD circuit.
Preferably, the communication device further includes a third diode connected in series between the output terminal of the third rectifier bridge circuit and the power supply terminal of the PD circuit.
Preferably, a third optocoupler is arranged between the third switching circuit and the third voltage detection circuit.
Preferably, the third rectifier bridge circuit includes a fifth rectifier bridge and a sixth rectifier bridge, two normally closed contacts of the fifth relay are respectively connected with two input ends of the fifth rectifier bridge, and two normally closed contacts of the sixth relay are respectively connected with two input ends of the sixth rectifier bridge.
On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.
The utility model discloses an actively advance the effect and lie in: first POE interface and the equal acquiescence work of second POE interface are in the PD mode, when POE power connection is on first POE interface, first voltage detection circuit detects first rectifier bridge circuit has voltage output, and to first switching circuit output first control signal, drive third relay and fourth relay, so that the second POE interface switches to the PSE mode from the PD mode, even make second POE interface switch to being connected with second PSE circuit port from being connected with second rectifier bridge circuit. When the POE power is connected on the second POE interface, the second voltage detection circuit detects that the second rectifier bridge circuit has voltage output to second switching circuit output second control signal drives first relay and second relay, so that first POE interface switches to the PSE mode from the PD mode, namely makes first POE interface switch to be connected with first PSE circuit port from being connected with first rectifier bridge circuit. Compared with the prior art, the utility model provides a POE interface is more nimble among the communications facilities, can switch between PD mode and PSE mode.
Drawings
Fig. 1 is a block diagram of a communication device based on a POE interface according to embodiment 1.
Fig. 2 is a partial circuit diagram including a first relay and a second relay in the communication apparatus provided in embodiment 1.
Fig. 3 is a partial circuit diagram of a communication apparatus including a third relay and a fourth relay provided in embodiment 1.
Fig. 4 is a partial circuit diagram of a communication device including a first rectifier bridge circuit and a first voltage detection circuit according to embodiment 1.
Fig. 5 is a partial circuit diagram of a communication device including a second rectifier bridge circuit and a second voltage detection circuit according to embodiment 1.
Fig. 6 is a block diagram of a communication device based on a POE interface according to embodiment 2.
Fig. 7 is a partial circuit diagram of a communication device including a third optocoupler and a third switching circuit according to embodiment 2.
Detailed Description
The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, this embodiment provides a communication device based on a POE interface, including:
first POE interface, first relay, second relay, first PSE circuit port, first rectifier bridge circuit, first voltage detection circuit, first switching circuit, second POE interface, third relay, fourth relay, second PSE circuit port, second rectifier bridge circuit, second voltage detection circuit, second switching circuit and PD circuit.
As shown in fig. 1-3, the CTA _ A, CTB _ A, CTC _ A, CTD _ a pin of the first POE interface is electrically connected to the common terminal pin 4 and pin 9 of the first relay RLY1 and the common terminal pin 4 and pin 9 of the second relay RLY2, respectively. Normally closed contact pins 3 and 10 of the first relay RLY1 and normally closed contact pins 3 and 10 of the second relay RLY2 are electrically connected with four input ends of the first rectifier bridge circuit respectively. The PSE12_ A, PSE36_ A, PSE45_ A, PSE78_ a pin of the first PSE circuit port is electrically connected to normally open contact pins 5 and 8 of the first relay RLY1 and normally open contact pins 5 and 8 of the second relay RLY2, respectively. The first voltage detection circuit is used for outputting a first control signal to the first switching circuit when detecting that the first rectifier bridge circuit outputs a preset voltage, and the first switching circuit is used for driving the common end of the third relay RLY3 and the fourth relay RLY4 to be switched from a normally closed contact to a normally open contact when receiving the first control signal.
The CTA _ B, CTB _ B, CTC _ B, CTD _ B pin of the second POE interface is electrically connected to the common terminal pin 4 and pin 9 of the third relay RLY3 and the common terminal pin 4 and pin 9 of the fourth relay RLY4, respectively. Normally closed contact pins 3 and 10 of the third relay RLY3 and normally closed contact pins 3 and 10 of the fourth relay RLY4 are electrically connected with four input ends of the second rectifier bridge circuit, respectively. The PSE12_ B, PSE36_ B, PSE45_ B, PSE78_ B pin of the second PSE circuit port is electrically connected to normally open contact pin 5, pin 8 of the third relay RLY3 and normally open contact pin 5, pin 8 of the fourth relay RLY4, respectively. The second voltage detection circuit is used for outputting a second control signal to the second switching circuit when detecting that the second rectifier bridge circuit outputs the preset voltage, and the second switching circuit is used for driving the common end of the first relay RLY1 and the second relay RLY2 to be switched from the normally closed contact to the normally open contact when receiving the second control signal.
And the output ends of the first rectifier bridge circuit and the second rectifier bridge circuit are connected with the power supply end of the PD circuit.
In this embodiment, first POE interface and the equal acquiescence work of second POE interface are in the PD mode, when the POE power is connected on first POE interface, first voltage detection circuit detects first rectifier bridge circuit has voltage output, and export first control signal to first switching circuit, drive third relay and fourth relay, so that the second POE interface switches to the PSE mode from the PD mode, even make the second POE interface switch to being connected with second PSE circuit port from being connected with second rectifier bridge circuit. When the POE power is connected on the second POE interface, the second voltage detection circuit detects that the second rectifier bridge circuit has voltage output to second switching circuit output second control signal drives first relay and second relay, so that first POE interface switches to the PSE mode from the PD mode, namely makes first POE interface switch to be connected with first PSE circuit port from being connected with first rectifier bridge circuit.
In order to ensure that the voltage detection circuit can normally detect which POE interface has POE power access power supply, the PD terminals of different POE interfaces need to be properly isolated before combining. In an optional embodiment, the communication device further includes a first diode connected in series between the output terminal of the first rectifier bridge circuit and the power supply terminal of the PD circuit; the communication device further comprises a second diode connected in series between the output end of the second rectifier bridge circuit and the power supply end of the PD circuit.
In an alternative embodiment, as shown in fig. 4, the first rectifier bridge circuit includes a first rectifier bridge U39 and a second rectifier bridge U40, the normally closed contact pin 3 and pin 10 of the first relay RLY1 are respectively connected to the input terminals PD12_ a and PD36_ a of the first rectifier bridge U39, and the normally closed contact pin 3 and pin 10 of the second relay RLY2 are respectively connected to the input terminals PD45_ a and PD78_ a of the second rectifier bridge U40.
As shown in fig. 5, the second rectifier bridge circuit includes a third rectifier bridge U14 and a fourth rectifier bridge U15, the normally closed contact pin 3 and pin 10 of the third relay RLY3 are connected to the input terminals PD12_ B and PD36_ B of the third rectifier bridge U14, respectively, and the normally closed contact pin 3 and pin 10 of the fourth relay RLY4 are connected to the input terminals PD45_ B and PD78_ B of the fourth rectifier bridge U15, respectively.
Because the voltage that POE input power supply worked is higher, consequently need set up suitable isolation device between voltage detection circuit and switching circuit, ensure the reliability of circuit. In an optional implementation manner, a first optical coupler is disposed between the first switching circuit and the first voltage detection circuit, and a second optical coupler is disposed between the second switching circuit and the second voltage detection circuit.
In this embodiment, the first voltage detection circuit is configured to output a first control signal to the first switching circuit when detecting that the first rectifier bridge circuit outputs the preset voltage. In one example, the preset voltage is 48V, and the level of the first control signal is 5V.
In an optional embodiment, the first voltage detection circuit includes a first capacitor and a second capacitor, the first capacitor is connected in series between the input end and the output end of the first rectifier bridge, and the second capacitor is connected in series between the input end and the output end of the second rectifier bridge;
the second voltage detection circuit comprises a third capacitor and a fourth capacitor, the third capacitor is connected in series between the input end and the output end of the third rectifier bridge, and the fourth capacitor is connected in series between the input end and the output end of the fourth rectifier bridge.
In an alternative embodiment, as shown in fig. 4, the output terminal of the first rectifying bridge U39, the output terminal of the second rectifying bridge U40, and the output terminal PORT _ a _ SENSE of the first voltage detection circuit are electrically connected; the output terminal of the third rectifying bridge U14, the output terminal of the fourth rectifying bridge U15, and the output terminal PORT _ B _ SENSE of the second voltage detecting circuit are electrically connected.
Example 2
As shown in fig. 6, on the basis of embodiment 1, the communication device provided in this embodiment further includes a third POE interface, a fifth relay, a sixth relay, a third PSE circuit port, a third rectifier bridge circuit, a third voltage detection circuit, and a third switching circuit.
The third POE interface is respectively connected with two public ends of the fifth relay and two public ends of the sixth relay, two normally closed contacts of the fifth relay and two normally closed contacts of the sixth relay are respectively electrically connected with four input ends of the third rectifier bridge circuit, a third PSE circuit port is respectively electrically connected with two normally open contacts of the first relay and two normally open contacts of the second relay, and the third voltage detection circuit is used for outputting a third control signal to the third switching circuit when detecting that the third rectifier bridge circuit outputs preset voltage.
The first switching circuit is used for driving the common ends of the third relay, the fourth relay, the fifth relay and the sixth relay to be switched to the normally open contact when receiving a first control signal.
And the second switching circuit is used for driving the common ends of the first relay, the second relay, the fifth relay and the sixth relay to be switched to the normally open contact when receiving a second control signal.
The third switching circuit is used for driving the common end of the first relay, the second relay, the third relay and the fourth relay to be switched to the normally open contact when receiving a third control signal.
And the output end of the third rectifier bridge circuit is connected with the power supply end of the PD circuit.
In this embodiment, first POE interface, second POE interface and the equal default work of third POE interface are in the PD mode, when POE power is connected on first POE interface, first voltage detection circuit detects first rectifier bridge circuit has voltage output, and to first switching circuit output first control signal, drive third relay, the fourth relay, fifth relay and sixth relay, so that second POE interface and third POE interface all switch to the PSE mode from the PD mode, even make second POE interface switch to be connected with second PSE circuit port from switching to being connected with second PSE circuit port with second rectifier bridge circuit connection, and make third POE interface switch to be connected with third PSE circuit port from being connected with third rectifier bridge circuit. When the POE power is connected on the second POE interface, second voltage detection circuit detects that second rectifier bridge circuit has voltage output, and to second switching circuit output second control signal, drive first relay, the second relay, fifth relay and sixth relay, so that first POE interface and third POE interface all switch to the PSE mode from the PD mode, even make first POE interface switch to be connected with first PSE circuit port from being connected with first rectifier bridge circuit, and make third POE interface switch to be connected with third PSE circuit port from being connected with third rectifier bridge circuit. When the POE power is connected on the third POE interface, third voltage detection circuit detects that third rectifier bridge circuit has voltage output, and to third switching circuit output third control signal, drive first relay, the second relay, third relay and fourth relay, so that first POE interface and second POE interface all switch to the PSE mode from the PD mode, even make first POE interface switch to be connected with first PSE circuit port from being connected with first rectifier bridge circuit, and make second POE interface switch to be connected with second PSE circuit port from being connected with second rectifier bridge circuit.
In order to ensure that the voltage detection circuit can normally detect which POE interface has POE power access power supply, the PD terminals of different POE interfaces need to be properly isolated before combining. In an optional embodiment, the communication device further includes a third diode connected in series between the output terminal of the third rectifier bridge circuit and the power supply terminal of the PD circuit.
Because the voltage that POE input power supply worked is higher, consequently need set up suitable isolation device between voltage detection circuit and switching circuit, ensure the reliability of circuit. In an optional embodiment, a third optical coupler is disposed between the third switching circuit and the third voltage detection circuit.
In a specific implementation, as shown in fig. 7, an input terminal of the third optical coupler U20 is connected to the output terminal PORT _ C _ SENSE of the third voltage detection circuit. When a high-level third control signal PORT _ C _ SENSE output by the third voltage detection circuit is received, the first optocoupler U18 is turned on, and signals POE _ delay _ a and POE _ delay _ B output by the third switching circuit are both high levels. And the signal POE _ RELAY _ A is respectively connected with the power supply ends of the first RELAY and the second RELAY, and the signal POE _ RELAY _ B is respectively connected with the power supply ends of the third RELAY and the fourth RELAY. It will be appreciated by those skilled in the art that a high signal at the power supply terminal of a relay may cause its common terminal to switch from a normally closed contact to a normally open contact. In this embodiment, the common port of the first RELAY and the second RELAY is switched to the normally open contact from the normally closed contact by the high-level signal POE _ RELAY _ a, and the common port of the third RELAY and the fourth RELAY is switched to the normally open contact from the normally closed contact by the high-level signal POE _ RELAY _ B.
In an optional embodiment, the third rectifier bridge circuit includes a fifth rectifier bridge and a sixth rectifier bridge, two normally closed contacts of the fifth relay are respectively connected with two input terminals of the fifth rectifier bridge, and two normally closed contacts of the sixth relay are respectively connected with two input terminals of the sixth rectifier bridge.
Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. A communication equipment based on POE interface, characterized by includes:
the power supply circuit comprises a first POE interface, a first relay, a second relay, a first PSE circuit port, a first rectifier bridge circuit, a first voltage detection circuit, a first switching circuit, a second POE interface, a third relay, a fourth relay, a second PSE circuit port, a second rectifier bridge circuit, a second voltage detection circuit, a second switching circuit and a PD circuit;
the first POE interface is respectively and electrically connected with two public ends of a first relay and two public ends of a second relay, two normally closed contacts of the first relay and two normally closed contacts of the second relay are respectively and electrically connected with four input ends of a first rectifier bridge circuit, a port of the first PSE circuit is respectively and electrically connected with two normally open contacts of the first relay and two normally open contacts of the second relay, a first voltage detection circuit is used for outputting a first control signal to a first switching circuit when detecting that the first rectifier bridge circuit outputs preset voltage, and the first switching circuit is used for driving the public ends of a third relay and a fourth relay to be switched from the normally closed contacts to the normally open contacts when receiving the first control signal;
the second POE interface is respectively and electrically connected with two public ends of a third relay and two public ends of a fourth relay, two normally closed contacts of the third relay and two normally closed contacts of the fourth relay are respectively and electrically connected with four input ends of a second rectifier bridge circuit, a port of a second PSE circuit is respectively and electrically connected with two normally open contacts of the third relay and two normally open contacts of the fourth relay, a second voltage detection circuit is used for outputting a second control signal to a second switching circuit when detecting that the second rectifier bridge circuit outputs preset voltage, and the second switching circuit is used for driving the public ends of the first relay and the second relay to be switched from the normally closed contacts to the normally open contacts when receiving the second control signal;
and the output ends of the first rectifier bridge circuit and the second rectifier bridge circuit are connected with the power supply end of the PD circuit.
2. The communication device according to claim 1, further comprising a first diode connected in series between the output terminal of the first rectifier bridge circuit and the power supply terminal of the PD circuit;
the communication equipment further comprises a second diode which is connected in series between the output end of the second rectifier bridge circuit and the power supply end of the PD circuit.
3. The communication device as claimed in claim 1, wherein a first optical coupler is disposed between the first switching circuit and the first voltage detection circuit, and a second optical coupler is disposed between the second switching circuit and the second voltage detection circuit.
4. The communication device according to claim 1, wherein the first rectifier bridge circuit includes a first rectifier bridge and a second rectifier bridge, two normally closed contacts of the first relay are connected to two input terminals of the first rectifier bridge, respectively, and two normally closed contacts of the second relay are connected to two input terminals of the second rectifier bridge, respectively;
the second rectifier bridge circuit comprises a third rectifier bridge and a fourth rectifier bridge, two normally closed contacts of the third relay are respectively connected with two input ends of the third rectifier bridge, and two normally closed contacts of the fourth relay are respectively connected with two input ends of the fourth rectifier bridge.
5. The communication device of claim 4, wherein the first voltage detection circuit comprises a first capacitor and a second capacitor, the first capacitor is connected in series between the input terminal and the output terminal of the first rectifier bridge, and the second capacitor is connected in series between the input terminal and the output terminal of the second rectifier bridge;
the second voltage detection circuit comprises a third capacitor and a fourth capacitor, the third capacitor is connected in series between the input end and the output end of the third rectifier bridge, and the fourth capacitor is connected in series between the input end and the output end of the fourth rectifier bridge.
6. The communication device of claim 5, wherein an output of the first rectifier bridge, an output of the second rectifier bridge, and an output of the first voltage detection circuit are electrically connected;
and the output end of the third rectifier bridge, the output end of the fourth rectifier bridge and the output end of the second voltage detection circuit are electrically connected.
7. The communication device of claim 1, further comprising a third POE interface, a fifth relay, a sixth relay, a third PSE circuit port, a third rectifier bridge circuit, a third voltage detection circuit, and a third switching circuit;
the third POE interface is respectively and electrically connected with two public ends of a fifth relay and two public ends of a sixth relay, two normally closed contacts of the fifth relay and two normally closed contacts of the sixth relay are respectively and electrically connected with four input ends of a third rectifier bridge circuit, a port of the third PSE circuit is respectively and electrically connected with two normally open contacts of the first relay and two normally open contacts of the second relay, and the third voltage detection circuit is used for outputting a third control signal to the third switching circuit when detecting that the third rectifier bridge circuit outputs a preset voltage;
the first switching circuit is used for driving the common ends of the third relay, the fourth relay, the fifth relay and the sixth relay to be switched from the normally closed contact to the normally open contact when receiving a first control signal;
the second switching circuit is used for driving the common ends of the first relay, the second relay, the fifth relay and the sixth relay to be switched from the normally closed contact to the normally open contact when receiving a second control signal;
the third switching circuit is used for driving the common end of the first relay, the second relay, the third relay and the fourth relay to be switched from the normally closed contact to the normally open contact when receiving a third control signal;
and the output end of the third rectifier bridge circuit is connected with the power supply end of the PD circuit.
8. The communication device of claim 7, further comprising a third diode connected in series between the output terminal of the third rectifier bridge circuit and the power supply terminal of the PD circuit.
9. The communication device as claimed in claim 7, wherein a third optical coupler is provided between the third switching circuit and the third voltage detection circuit.
10. The communication device according to claim 7, wherein the third rectifier bridge circuit includes a fifth rectifier bridge and a sixth rectifier bridge, two normally closed contacts of the fifth relay are respectively connected with two input terminals of the fifth rectifier bridge, and two normally closed contacts of the sixth relay are respectively connected with two input terminals of the sixth rectifier bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020547747.XU CN211579987U (en) | 2020-04-14 | 2020-04-14 | Communication equipment based on POE interface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020547747.XU CN211579987U (en) | 2020-04-14 | 2020-04-14 | Communication equipment based on POE interface |
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| CN211579987U true CN211579987U (en) | 2020-09-25 |
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| CN202020547747.XU Active CN211579987U (en) | 2020-04-14 | 2020-04-14 | Communication equipment based on POE interface |
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