CN112332881B

CN112332881B - Enabling circuit and communication device

Info

Publication number: CN112332881B
Application number: CN202011121458.4A
Authority: CN
Inventors: 李晃忠
Original assignee: Shenzhen Sundray Technologies Co ltd
Current assignee: Shenzhen Sundray Technologies Co ltd
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2022-04-26
Anticipated expiration: 2040-10-19
Also published as: CN112332881A

Abstract

The embodiment of the invention discloses an enabling circuit and a communication device, when an input port or an output port of communication equipment where the enabling circuit is located is connected with an external power supply, the input side circuit or the output side circuit enables a level value of one pin of a main control circuit, which is connected with the input side circuit and the output side circuit, to be lower than a level threshold value based on the external power supply, and the level value of the other pin is higher than the level threshold value because the other pin is not acted by the external power supply, so that the main control circuit can quickly determine that the communication equipment where the enabling circuit is located is terminal equipment, an enabling signal is formed by the main control circuit and transmitted to an electronic device, the electronic device is enabled, the enabling of the electronic device is simplified, and the communication signal of the communication device formed by the communication equipment is enhanced.

Description

Enabling circuit and communication device

Technical Field

The present invention relates to the field of communication device circuit technologies, and in particular, to an enable circuit and a communication device.

Background

In a communication link of a conventional communication apparatus, when a plurality of devices are simultaneously connected to the communication apparatus and a distance exceeds a certain range, a communication rate of the communication apparatus is affected due to factors such as signal reflection and echo. The electronic device can absorb the reflected wave on the communication link, effectively enhancing the signal strength. When a plurality of devices are simultaneously accessed to a link of a communication device, the traditional solution is to manually judge which two devices belong to terminal equipment, and then manually access an electronic device to the terminal equipment, so as to realize the enabling of the electronic device.

The manual access of the electronic device is prone to errors, once errors occur, adverse effects on signals can be generated, and the method for manually judging the terminal equipment is complex in program and low in efficiency.

Disclosure of Invention

An enable circuit provided in an embodiment of the present invention includes: the circuit comprises an input side circuit, an output side circuit and a main control circuit;

the first end of the input side circuit is connected with the input port, and the second end of the input side circuit is connected with the main control circuit;

the first end of the output side circuit is connected with the output port, and the second end of the output side circuit is connected with the main control circuit;

the main control circuit is connected with the electronic device;

the input port or the output port is connected with an external power supply, then the input side circuit or the output side circuit enables the level value of one pin of the main control circuit, which is connected with the input side circuit and the output side circuit, to be lower than a level threshold value based on the external power supply, the level value of the other pin is higher than the level threshold value due to the fact that the other pin is not affected by the external power supply, the main control circuit accordingly determines that the communication equipment where the enabling circuit is located is terminal equipment and generates an enabling signal, the main control circuit transmits the enabling signal to the electronic device, and the electronic device is enabled under the effect of the enabling signal.

In the above scheme, the main control circuit includes a first pin, a second pin and a third pin;

the first end of the input side circuit is connected with the input port, and the second end of the input side circuit is connected with the first pin; the first end of the output side circuit is connected with the output port, and the second end of the output side circuit is connected with the second pin; the third pin is connected to the electronic device.

In the above scheme, the external power supply is connected to the first pin or the second pin of the main control circuit through the input side circuit or the output side circuit;

when the first pin and the second pin are not connected with the external power supply, the level value of the first pin and the level value of the second pin are higher than a level threshold, if the first pin or the second pin is connected with the external power supply, and the level value of the first pin or the second pin is lower than the level threshold under the action of the external power supply, the main control circuit determines that the communication equipment where the enabling circuit is located is terminal equipment and generates an enabling signal, the main control circuit transmits the enabling signal to the electronic device, and the electronic device is enabled under the action of the enabling signal.

In the above aspect, the input side circuit includes: a first internal power supply and a first triode;

the base electrode of the first triode is connected with the input port, the first internal power supply is respectively connected with the collector electrode and the first pin of the first triode, and the emitter electrode of the first triode is grounded; the first internal power supply transmits a first high-order signal to a collector and a first pin of the first triode respectively, and the level value of the first pin is higher than a level threshold value;

if the external power supply is connected with the input port and sends a first current to the base electrode of the first triode, the first triode is conducted under the action of the first current and the first high-order signal to generate a second current to act on the first pin, and the level value of the first pin is lower than the level threshold under the action of the second current.

In the above scheme, the input side circuit further includes: the circuit comprises a first diode, a first resistor and a second resistor;

the input port is respectively connected with a first end of the first diode, a first end of the first resistor and a base electrode of the first triode, and a second end of the first diode is connected with a second end of the first resistor and then grounded;

the first internal power supply is connected with a first end of the second resistor, a second end of the second resistor is respectively connected with a collector electrode and a first pin of the first triode, and an emitter electrode of the first triode is grounded; the first internal power supply transmits a first high-order signal to the second resistor, and the level value of the first pin is higher than a level threshold value;

if the external power supply is connected with the input port and sends a first current to the input side circuit, the first current is divided by the first resistor to form a first voltage division signal, and the first voltage division signal acts on the base electrode of the first triode; the first high-order signal is divided by the second resistor to form a second voltage division signal, the second voltage division signal acts on a collector of the first triode, the first triode is conducted under the action of the first voltage division signal and the second voltage division signal to obtain a second current acting on the first pin, and a level value of the first pin is lower than a level threshold under the action of the second current.

In the above aspect, the output side circuit includes: a second internal power supply and a second triode;

the base electrode of the second triode is connected with the output port, the second internal power supply is respectively connected with the collector electrode and the second pin of the second triode, and the emitter electrode of the second triode is grounded; the second internal power supply transmits a second high-order signal to a collector and a second pin of the second triode respectively, and the level value of the second pin is higher than a level threshold value;

if the external power supply is connected with the output port and sends a first current to the base electrode of the second triode, the second triode is conducted under the action of the first current and the second high-order signal to obtain that the second current acts on the second pin, and the level value of the second pin is lower than the level threshold under the action of the second current.

In the above scheme, the output side circuit further includes: a second diode, a third resistor and a fourth resistor;

the output port is respectively connected with a first end of the second diode, a first end of the third resistor and a base electrode of the second triode, and a second end of the second diode and a second end of the third resistor are grounded after being connected;

the second internal power supply is connected with a first end of the fourth resistor, a second end of the fourth resistor is respectively connected with a collector and a second pin of the second triode, and an emitter of the second triode is grounded; the second internal power supply transmits a second high-order signal to the fourth resistor, and the level value of the second pin is higher than a level threshold value;

if the external power supply is connected with the output port and sends a first current to the output side circuit, the first current is divided by the third resistor to form a third voltage division signal, and the third voltage division signal acts on the base electrode of the second triode; the second high-order signal is divided by the fourth resistor to form a fourth voltage dividing signal, the fourth voltage dividing signal acts on a collector of the second triode, the second triode is conducted under the action of the third voltage dividing signal and the fourth voltage dividing signal to obtain that the second current acts on the second pin, and a level value of the second pin is lower than a level threshold under the action of the second current.

In the above aspect, the input side circuit includes: a first internal power supply and a first field effect transistor;

the grid electrode of the first field effect transistor is connected with the input port, the first internal power supply is respectively connected with the drain electrode and the first pin of the first triode, and the source electrode of the first triode is grounded; the first internal power supply transmits a first high-order signal to a drain electrode and a first pin of the first field effect transistor respectively, and the level value of the first pin is higher than a level threshold value;

if the external power supply is connected with the input port and sends a first current to the grid electrode of the first field effect transistor, the first field effect transistor is conducted under the action of the first current and the first high-order signal, the second current is obtained to act on the first pin, and the level value of the first pin under the action of the second current is lower than the level threshold value.

the input port is respectively connected with a first end of the first diode, a first end of the first resistor and a grid electrode of the first field effect transistor, and a second end of the first diode is connected with a second end of the first resistor and then grounded;

the first internal power supply is connected with a first end of the second resistor, a second end of the second resistor is respectively connected with a drain electrode and a first pin of the first field effect transistor, and a source electrode of the first field effect transistor is grounded; the first internal power supply transmits a first high-order signal to the second resistor, and the level value of the first pin is higher than a level threshold value;

if the external power supply is connected with the input port and sends a first current to the input side circuit, the first current is divided by the first resistor to form a first voltage division signal, and the first voltage division signal acts on a grid electrode of the first field effect transistor; the first high-order signal is divided by the second resistor to form a second voltage division signal, the second voltage division signal acts on a drain electrode of the first field effect transistor, the first field effect transistor is conducted under the action of the first voltage division signal and the second voltage division signal to obtain a second current acting on the first pin, and a level value of the first pin is lower than a level threshold under the action of the second current.

In the above aspect, the output side circuit includes: a second internal power supply and a second field effect transistor;

the grid electrode of the second field effect transistor is connected with the output port, the second internal power supply is respectively connected with the drain electrode and the second pin of the second field effect transistor, and the source electrode of the second field effect transistor is grounded; the second internal power supply transmits a second high-order signal to a drain electrode and a second pin of the second field effect transistor respectively, and the level value of the second pin is higher than a level threshold value;

if the external power supply is connected with the output port and sends a first current to the grid electrode of the second field effect transistor, the second field effect transistor is conducted under the action of the first current and the second high-order signal to obtain that the second current acts on the second pin, and the level value of the second pin is lower than the level threshold under the action of the second current.

the output port is respectively connected with the first end of the second diode, the first end of the third resistor and the grid electrode of the second field effect transistor, and the second end of the second diode and the second end of the third resistor are grounded after being connected;

the second internal power supply is connected with a first end of the fourth resistor, a second end of the fourth resistor is respectively connected with a drain electrode and a second pin of the second field effect transistor, and a source electrode of the second field effect transistor is grounded; the second internal power supply transmits a second high-order signal to the fourth resistor, and the level value of the second pin is higher than a level threshold value;

if the external power supply is connected with the output port and sends a first current to the output side circuit, the first current is divided by the third resistor to form a third voltage division signal, and the third voltage division signal acts on the grid electrode of the second field effect transistor; the second high-order signal is divided by the fourth resistor to form a fourth voltage dividing signal, the fourth voltage dividing signal acts on a drain electrode of the second field effect transistor, the second field effect transistor is conducted under the action of the third voltage dividing signal and the fourth voltage dividing signal to obtain a second current acting on the second pin, and a level value of the second pin is lower than a level threshold under the action of the second current.

In the above aspect, the electronic device includes: enabling a resistor and an intelligent switch;

the third pin is connected with the first end of the intelligent switch, the second end of the intelligent switch is connected with the communication transceiver, the first end of the enabling resistor is connected with the communication transceiver, and the second end of the enabling resistor is connected with the first end of the intelligent switch;

if the external power supply transmits a first current to the input side circuit or the output side circuit, the input side circuit or the output side circuit transmits a second current to the first pin or the second pin of the main control circuit based on the first current, the level value of one pin of the first pin or the second pin is lower than the level threshold value under the action of the second current, the level value of the other pin is higher than the level threshold value, the main control circuit determines that the communication equipment where the enabling circuit is located is terminal equipment and generates an enabling signal, the main control circuit transmits the enabling signal to the intelligent switch through the third pin, the intelligent switch is closed, and the enabling resistor is enabled under the action of the enabling signal.

The communication device comprises a plurality of communication devices which are connected in sequence, wherein the enabling circuit is arranged in each communication device, and the enabling circuit in each communication device is connected with the communication transceiver in the corresponding communication device; the communication transceiver in each communication device is connected with the electronic device in the corresponding communication device;

when the input port or the output port of one communication device is connected with the external power supply in the other communication device, the enabling circuit of the one communication device determines that the one communication device is the terminal device, and enables the electronic device in the one communication device.

In the embodiment of the invention, when the input port or the output port of the communication device where the enabling circuit is located is connected with an external power supply, the input side circuit or the output side circuit enables the level value of one pin of the main control circuit, which is connected with the input side circuit and the output side circuit, to be lower than the level threshold value based on the external power supply, and the level value of the other pin is higher than the level threshold value due to the fact that the other pin is not acted by the external power supply, so that the main control circuit can quickly determine that the communication device where the enabling circuit is located is the terminal device, the main control circuit forms the enabling signal and transmits the enabling signal to the electronic device, enabling of the electronic device is simplified, and the communication signal of the communication device formed by the communication device is enhanced.

Drawings

FIG. 1 is a first block diagram of an enable circuit according to an embodiment of the present invention;

FIG. 2 is a block diagram of a second enable circuit according to an embodiment of the present invention;

FIG. 3 is a block diagram of an enable circuit according to an embodiment of the present invention;

FIG. 4 is a block diagram of an enable circuit according to an embodiment of the present invention;

FIG. 5 is a block diagram of an enable circuit according to an embodiment of the present invention;

fig. 6 is a block diagram of a communication device according to an embodiment of the present invention.

Detailed Description

In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application are further described in detail with reference to the drawings and the embodiments, the described embodiments should not be considered as limiting the present application, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.

Where similar language of "first/second" appears in the specification, the following description is added, and where reference is made to the term "first \ second \ third" merely to distinguish between similar items and not to imply a particular ordering with respect to the items, it is to be understood that "first \ second \ third" may be interchanged with a particular sequence or order as permitted, to enable the embodiments of the application described herein to be performed in an order other than that illustrated or described herein.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the application.

In order to solve the technical problems in the prior art that the process of judging whether the communication device is a terminal device is complex, and an error is easily caused when an electronic device is manually accessed, the embodiment of the disclosure provides an enabling circuit 100. Fig. 1 is a first block diagram of an enable circuit 100 according to an embodiment of the present invention.

The enabling circuit 100 provided by the embodiment of the invention is applied to communication equipment. The enable circuit 100 includes a main control circuit 2, an input side circuit 1, and an output side circuit 3.

In the embodiment of the present disclosure, the main control circuit 2 includes a first pin, a second pin and a third pin. The first end of the input side circuit 1 is connected with the input port 5, and the second end of the input side circuit 1 is connected with the first pin; the first end of the output side circuit 3 is connected with the output port 6, and the second end of the output side circuit 3 is connected with the second pin; the third pin is connected to the electronic device 4.

In the embodiment of the present disclosure, the input port 5 or the output port 6 is connected to an external power supply, the input side circuit 1 or the output side circuit 3 enables the main control circuit 2 to connect one of the first pin of the input side circuit 1 and the second pin of the output side circuit 3 based on the external power supply, where the level value of the first pin is lower than the level threshold, and the level value of the second pin is higher than the level threshold because the main control circuit 2 is not connected to the external power supply, the main control circuit 2 thereby determines that the communication device where the enabling circuit 100 is located is a terminal device and generates an enabling signal, the main control circuit 2 transmits the enabling signal to the electronic device 4, and the electronic device 4 is enabled under the effect of the enabling signal, so as to enhance the communication signal of the communication link where the communication device is located.

In the disclosed embodiment of the invention, the electronic device 4 is mainly used to enhance the communication signal of the communication link in which the communication device is located. The electronic device 4 may be one or a combination of several of a resistor, a capacitor and an electromagnetic coil.

In the embodiment of the invention, an input port 5 or an output port 6 is connected with an external power supply, an input side circuit 1 or an output side circuit 3 forms a second current based on the external power supply, and the second current acts on a first pin or a second pin of a main control circuit 2; if the level value of the first pin or the second pin under the action of the second current is lower than the level threshold, that is, the level of the first pin or the second pin changes from high level to low level, the main control circuit 2 determines that the communication device where the enabling circuit 100 is located is a terminal device and generates an enabling signal, the main control circuit transmits the enabling signal to the electronic device 4, and the electronic device 4 is enabled under the action of the enabling signal.

In the embodiment of the invention, a plurality of communication devices are sequentially connected in a communication link. The communication devices respectively connected to the two ends of the communication link are terminal devices. When the communication link distance is too long, the communication rate of the communication link may be affected. In the embodiments disclosed in the present invention, by enabling a specific electronic device 4 on the terminal device, the communication signal of the communication link can be enhanced, and the communication rate can be improved. In general, a communication device may include: gateway devices, servers, etc.

In the embodiment of the present disclosure, the input port 5 and the output port 6 are both connected to an external power supply of another communication device, and the external power supply of the other communication device transmits a first current to the input-side circuit 1 and the output-side circuit 3, and the input-side circuit 1 and the output-side circuit 3 are turned on under the action of the first current to form a second current acting on the first pin and the second pin. The first pin and the second pin of the main control circuit 2 are simultaneously changed from high level to low level, the main control circuit 2 determines that the communication device where the enabling circuit 100 is located is not a terminal device, the main control circuit 2 does not generate an enabling signal, and therefore the electronic device 4 is not enabled.

In the embodiment of the present disclosure, an external power supply is provided inside the input port 5 and the output port 6 of the other communication device. If the input port 5 or the output port 6 of the communication device is connected to the input port 5 or the output port 6 of another communication device via a transmission line, the input port 5 or the output port 6 of the communication device is connected to an external power supply of another communication device. In the disclosed embodiment of the invention, the external power supply always transmits the first current to the outside. In the disclosed embodiment of the present invention, the electronic device 4 may include: an intelligent switch and an enabling resistor for enhancing a communication signal of a communication line on which the communication device is located. The first end of the intelligent switch is connected with the third pin of the main control circuit 2, the second end of the intelligent switch is connected with the communication transceiver inside the communication equipment, the first end of the enabling resistor is connected with the communication transceiver inside the communication equipment, and the second end of the enabling resistor is connected with the first end of the intelligent switch. When the intelligent switch acquires the enabling signal sent by the main control circuit 2, the intelligent switch is closed, the enabling resistor is connected with the communication transceiver in the communication equipment, and the communication signal of the communication link where the communication equipment is located can be enhanced.

In the disclosed embodiment of the present invention, the enable signal may include: an electrical signal of a certain voltage. The intelligent switch is a switch with preset logic, and is closed after the intelligent switch receives the enabling signal.

In the embodiment of the present disclosure, the main control circuit 2 may include: a Micro Control Unit (MCU). When the MCU receives the second current transmitted by the input side circuit 1 or the output side circuit 3, one pin of the MCU connected to the input side circuit 1 and the output side circuit 3 has a high level and is switched to a low level, and the other pin is still at a high level. The MCU forms an enable signal through preset logic, the enable signal is transmitted to the electronic device 4, and the electronic device 4 is enabled. In the embodiment of the present disclosure, the main control circuit 2 may also be another logic processor or logic circuit with the same function.

In the embodiment of the invention, the enabling circuit inside the communication equipment is connected with other communication equipment on the input port side of the communication equipment or the output port side of the communication equipment. An external power supply inside the other communication device sends a first current to an enable circuit inside the communication device, the enable circuit enabling the electronic device based on the first current. When only one side of the communication equipment is connected with other communication equipment, the pin of the main control circuit in the enabling circuit, which is only connected with the side of the communication equipment, is changed from high level to low level, so that the main control circuit can quickly determine that the communication equipment where the enabling circuit is located is terminal equipment, enable the electronic device, simplify the enabling process of the electronic device, and enhance the communication signal of the communication link where the communication equipment is located.

In the embodiment of the disclosure, the level values of the first pin and the second pin are lower than the level threshold, and then the first pin and the second pin are at a low level. And if the level values of the first pin and the second pin are higher than the level threshold value, the first pin and the second pin are at high level.

The disclosed embodiment of the invention provides an enable circuit 100. Referring to fig. 2, a second structure diagram of the enable circuit 100 according to the embodiment of the invention is shown.

In the embodiment of the present disclosure, an enable circuit 100 is disposed inside a communication device, and the enable circuit 100 includes: an input side circuit 1, an output side circuit 3, and a main control circuit 2.

In the disclosed embodiment of the present invention, an input side circuit 1 includes: a first internal power supply 7 and a first transistor 8; the base electrode of the first triode 8 is connected with the input port 5 of the communication equipment, the first internal power supply 7 is respectively connected with the collector electrode of the first triode 8 and the first pin 11 of the main control circuit 2, and the emitter electrode of the first triode 8 is grounded; the first internal power supply 7 transmits a first high-order signal to a collector of the first triode 8 and a first pin 11 respectively, and the level value of the first pin 11 is higher than a level threshold value.

In the disclosed embodiment of the present invention, the output side circuit 3 includes: a second internal power supply 9 and a second transistor 10; the base electrode of the second triode 10 is connected with the output port 6, the second internal power supply 9 is respectively connected with the collector electrode of the second triode 10 and the second pin 12 of the main control circuit 2, and the emitter electrode of the second triode 10 is grounded; the second internal power supply 9 transmits a second high-order signal to the collector of the second triode 10 and the second pin 12 respectively, and the level value of the second pin 12 is higher than the level threshold.

In the embodiment of the present disclosure, if the input port 5 of the communication device 200 serving as the terminal device is connected to an external power source of another communication device 200, and the output port 6 is not connected to the external power source of another communication device 200, the external power source sends a first current to the base of the first transistor 8, the first transistor 8 is turned on under the action of the first current and the first high-order signal to obtain a second current, and the second current is transmitted to the first pin 11, and the level value of the first pin 11 is lower than the level threshold under the action of the second current. At this time, the second pin 12 is not connected to the external power supply, and the level value of the second pin 12 is higher than the level threshold, so the main control circuit 2 forms an enable signal, the main control circuit 2 transmits the enable signal to the electronic device 4 through the third pin 13, and the electronic device 4 is enabled under the action of the enable signal.

In the embodiment of the present disclosure, if the output port 6 of the communication device 200 serving as the terminal device is connected to an external power supply of another communication device 200, and the input port 5 is not connected to the external power supply of another communication device 200, the external power supply sends a first current to the base of the second transistor 10, the second transistor 10 is turned on under the action of the first current and the second high-order signal to obtain a second current, and the second current is transmitted to the second pin 12, and the level value of the second pin 12 is lower than the level threshold under the action of the second current. At this time, the first pin 11 is not connected to an external power supply, and the level value of the first pin 11 is higher than the level threshold, so the main control circuit 2 forms an enable signal, the main control circuit 2 transmits the enable signal to the electronic device 4 through the third pin 13, and the electronic device 4 is enabled under the action of the enable signal.

In the embodiment of the present disclosure, the communication device 200 is connected to the external power source of the other communication device 200 before the input port 5 and the output port 6 are connected. The first triode 8 is not conducted, the first pin 11 of the main control circuit 2 receives the first high-order signal transmitted by the first internal power supply 7, and the first pin 11 of the main control circuit 2 is at a high level under the action of the first high-order signal. The second triode 10 is not turned on, the second pin 12 of the main control circuit 2 receives the second high-order signal transmitted by the second internal power supply 9, and the second pin 12 of the main control circuit 2 is at a high level under the action of the second high-order signal. The master control circuit 2 does not form an enable signal. If the input port 5 of the communication device 200 is connected to an external power source, the first transistor 8 is turned on under the action of the first current and the first high-order signal to obtain a second current. The first pin 11 of the main control circuit 2 receives a second current transmitted by the first triode 8, the voltage of the second current is lower than that of the first high-order signal, the first pin 11 is converted from a high level to a low level, and the second pin 12 is also a high level. The main control circuit 2 determines the communication device 200 where the enabling circuit 100 is located as a terminal device and forms an enabling signal to be transmitted to the electronic device 4 to enable the electronic device 4. If the output port 6 of the communication device 200 is connected to an external power source, the second transistor 10 is turned on under the action of the first current and the first high-order signal, so as to obtain a second current. The second pin 12 of the main control circuit 2 receives a second current transmitted by the second triode 10, the voltage of the second current is lower than that of the second high-order signal, the second pin 12 is converted from a high level to a low level, and the first pin 11 is also a high level. The main control circuit 2 determines the communication device 200 where the enabling circuit 100 is located as a terminal device and forms an enabling signal to be transmitted to the electronic device 4 to enable the electronic device 4.

The disclosed embodiment of the invention provides an enable circuit 100. Please refer to fig. 3, which is a block diagram of an enable circuit 100 according to an embodiment of the present invention.

In the embodiment of the present disclosure, an enabling circuit 100 is disposed inside a communication device 200, and the enabling circuit 100 includes: an input side circuit 1, an output side circuit 3, and a main control circuit 2.

In the disclosed embodiment of the present invention, an input side circuit 1 includes: a first internal power supply 7 and a first field effect transistor 14; the grid electrode of the first field effect transistor 14 is connected with the input port 5, the first internal power supply 7 is respectively connected with the drain electrode of the first field effect transistor 14 and the first pin 11, and the source electrode of the first field effect transistor 14 is grounded; the first internal power supply 7 transmits a first high-order signal to the drain of the first field effect transistor 14 and the first pin 11 respectively, and the level value of the first pin 11 is higher than a level threshold value.

In the disclosed embodiment of the present invention, the output side circuit 3 includes: a second internal power supply 9 and a second field effect transistor 15; the grid electrode of the second field effect tube 15 is connected with the output port 6, the second internal power supply 9 is respectively connected with the drain electrode of the second field effect tube 15 and the second pin 12, and the source electrode of the second field effect tube 15 is grounded; the second internal power supply 9 transmits a second high-order signal to the drain electrode of the second field effect transistor 15 and the second pin 12 respectively, and the level value of the second pin 12 is higher than the level threshold value.

In the embodiment of the present disclosure, if the input port 5 of the communication device 200 serving as a terminal device is connected to an external power supply of another communication device 200, and the output port 6 is not connected to the external power supply of another communication device 200, the external power supply sends a first current to the gate of the first field effect transistor 14, the first field effect transistor 14 is turned on under the action of the first current and the first high-order signal to obtain a second current, and the second current is transmitted to the first pin 11, and the level value of the first pin 11 is lower than the level threshold under the action of the second current. At this time, the second pin 12 is not connected to the external power supply, and the level value of the second pin 12 is higher than the level threshold, so the main control circuit 2 forms an enable signal, the main control circuit 2 transmits the enable signal to the electronic device 4 through the third pin 13, and the electronic device 4 is enabled under the action of the enable signal.

In the embodiment of the present disclosure, if the output port 6 of the communication device 200 serving as a terminal device is connected to an external power supply of another communication device 200, and the input port 5 is not connected to the external power supply of another communication device 200, the external power supply sends a first current to the gate of the second field effect transistor 15, the second field effect transistor 15 is turned on under the action of the first current and the second high-order signal to obtain a second current, and the second current is transmitted to the second pin 12, and the level value of the second pin 12 is lower than the level threshold under the action of the second current. At this time, the first pin 11 is not connected to an external power supply, and the level value of the first pin 11 is higher than the level threshold, so the main control circuit 2 forms an enable signal, the main control circuit 2 transmits the enable signal to the electronic device 4 through the third pin 13, and the electronic device 4 is enabled under the action of the enable signal.

In the embodiment of the present disclosure, the communication device 200 is connected to the external power source of the other communication device 200 before the input port 5 and the output port 6 are connected. The first fet 14 is not turned on, the first pin 11 of the main control circuit 2 receives the first high-order signal transmitted by the first internal power supply 7, and the first pin 11 of the main control circuit 2 is at a high level under the action of the first high-order signal. The second fet 15 is not turned on, the second pin 12 of the main control circuit 2 receives the second high-order signal of the second internal power transmission 9, and the second pin 12 of the main control circuit 2 is at a high level under the action of the second high-order signal. The master control circuit 2 does not form an enable signal. If the input port 5 of the communication device 200 is connected to an external power source, the first fet 14 is turned on under the action of the first current and the first high-order signal, so as to obtain a second current. The first pin 11 of the main control circuit 2 receives a second current transmitted by the first fet 14, the voltage of the second current is lower than the first high-order signal, the first pin 11 is converted from a high level to a low level, and the second pin 12 is also a high level. The main control circuit 2 determines the communication device 200 where the enabling circuit 100 is located as a terminal device and forms an enabling signal to be transmitted to the electronic device 4 to enable the electronic device 4. If the output port 6 of the communication device 200 is connected to an external power source, the second fet 15 is turned on under the action of the first current and the first high-order signal, so as to obtain a second current. The second pin 12 of the main control circuit 2 receives a second current transmitted by the second fet 15, the voltage of the second current is lower than the second high-order signal, the second pin 12 is switched from high level to low level, and the first pin 11 is also high level. The main control circuit 2 determines the communication device 200 where the enabling circuit 100 is located as a terminal device and forms an enabling signal to be transmitted to the electronic device 4 to enable the electronic device 4.

The disclosed embodiment of the invention provides an enable circuit 100. Please refer to fig. 4, which is a fourth block diagram of the enable circuit 100 according to the embodiment of the present invention.

In the embodiment of the present disclosure, an enabling circuit 100 is disposed inside a communication device 200, and the enabling circuit T100 includes: an input side circuit 1, an output side circuit 3, and a main control circuit 2.

In the disclosed embodiment of the present invention, an input side circuit 1 includes: a first internal power supply 7, a first transistor 8, a first diode 16, a first resistor 17 and a second resistor 18. The input port 5 of the communication device 200 is respectively connected to a first end of a first diode 16, a first end of a first resistor 17, and a base of a first triode 8, and a second end of the first diode 16 and a second end of the first resistor 17 are grounded after being connected; the first internal power supply 7 is connected with a first end of a second resistor 18, a second end of the second resistor 18 is respectively connected with a collector of the first triode 8 and the first pin 11, and an emitter of the first triode 8 is grounded; the first internal power supply 7 transmits a first high order signal to the second resistor 18, and the level value of the first pin 11 is higher than the level threshold value.

In the disclosed embodiment of the present invention, the output side circuit 3 further includes: a second internal power supply 9, a second transistor 10, a second diode 20, a third resistor 19, and a fourth resistor 21; the output port 6 of the communication device 200 is connected to the first terminal of the second diode 20, the first terminal of the third resistor 19, and the base of the second transistor 10, and the second terminal of the second diode 20 and the second terminal of the third resistor 19 are connected to ground. The second internal power supply 9 is connected with a first end of a fourth resistor 21, a second end of the fourth resistor 21 is respectively connected with a collector of the second triode 10 and the second pin 12, and an emitter of the second triode 10 is grounded; the second internal power supply 9 transmits a second high order signal to the fourth resistor 21, and the level value of the second pin 12 is higher than the level threshold value.

In the disclosed embodiment of the invention, the electronic device 4 includes an intelligent switch 24 and another enabling resistor 23 for improving the communication of the communication apparatus 200. A communication transceiver 22 for communication is also provided inside the communication device 200. A first end of the intelligent switch 24 is connected to the third pin 13 of the main control circuit 2, a second end of the intelligent switch 24 is connected to the communication transceiver 22 inside the communication device 200, a first end of the enabling resistor 23 is connected to the communication transceiver 22 inside the communication device 200, and a second end of the enabling resistor 23 is connected to the first end of the intelligent switch 24. When the intelligent switch 24 acquires the enable signal sent by the main control circuit 2, the intelligent switch 24 is closed, the enable resistor 23 is connected with the communication transceiver 22 inside the communication device 200, the enable of the enable resistor 23 is completed, and the communication signal of the communication link where the communication device 200 is located can be enhanced after the enable of the enable resistor 23.

In the disclosed embodiment of the present invention, if the input port 5 of the communication device 200 as a terminal device is connected to an external power supply of another communication device 200, and the output port 6 is not connected to an external power supply of another communication device 200, the external power supply sends a first current to the input side circuit 1, the first current is divided by the first resistor 17 to form a first divided voltage signal, and the first divided voltage signal acts on the base of the first triode 8; the first high-order signal is divided into a second voltage division signal through the second resistor 18, the second voltage division signal acts on a collector of the first triode 8, the first triode 8 is conducted under the action of the first voltage division signal and the second voltage division signal to obtain a second current, the second current is transmitted to the first pin 11, the level value of the first pin 11 is lower than the level threshold, and the level value of the second pin 12 is still higher than the level threshold. The main control circuit 2 forms an enable signal, the main control circuit 2 transmits the enable signal to the intelligent switch 24 through the third pin 13, the intelligent switch 24 is closed under the effect of the enable signal, the enable resistor 23 is connected with the communication transceiver 22, and enabling of the enable resistor 23 is completed.

In the disclosed embodiment of the present invention, if the output port 6 of the communication device 200 as a terminal device is connected to an external power supply of another communication device 200, and the input port 5 is not connected to an external power supply of another communication device 200, the external power supply sends a first current to the output side circuit, the first current is divided by the third resistor 20 to form a third divided voltage signal, and the third divided voltage signal acts on the base of the second triode 10; the second high-order signal is divided by the fourth resistor 21 to form a fourth voltage dividing signal, the fourth voltage dividing signal acts on a collector of the second triode 10, the second triode 10 is conducted under the action of the third voltage dividing signal and the fourth voltage dividing signal to obtain a second current, the second current is transmitted to the second pin 12, the level value of the second pin 12 is lower than the level threshold, and the level value of the first pin 11 is higher than the level threshold. The main control circuit 2 forms an enable signal, the main control circuit 2 transmits the enable signal to the intelligent switch 24 through the third pin 13, the intelligent switch 24 is closed under the effect of the enable signal, the enable resistor 23 is connected with the communication transceiver 22, and enabling of the enable resistor 23 is completed.

In the embodiment of the present disclosure, before the input port 5 and the output port 6 of the communication device 200 are connected to the external power source of another communication device 200, the first triode 8 is not turned on, the first high-order signal is divided by the second resistor 18 to form a second divided signal, the first pin 11 of the main control circuit 2 receives the second divided signal, and the first pin 11 of the main control circuit 2 is at a high level under the action of the second divided signal. The second triode 10 is not conducted, a second high-order signal sent by the second internal power supply 9 is divided by the fourth resistor 21 to form a fourth voltage dividing signal, the second pin 12 of the main control circuit 2 receives the fourth voltage dividing signal, and the second pin 12 of the main control circuit 2 is at a high level under the action of the fourth voltage dividing signal. If the input port 5 of the communication device 200 is connected to an external power source, the external power source sends a first current to the input-side circuit 1, the first current is divided by the first resistor 17 to form a first divided voltage signal, the first divided voltage signal acts on the base of the first triode 8, and the first triode 8 is turned on under the action of the first divided voltage signal and the second divided voltage signal to obtain a second current. The first pin 11 of the main control circuit 2 receives a second current transmitted by the first triode 8, the voltage of the second current is lower than that of the second voltage division signal, the first pin 11 is converted from a high level to a low level, and the level of the second pin 12 is also a high level. The main control circuit 2 determines that the communication device 200 where the enabling circuit 100 is located is a terminal device and forms an enabling signal to be transmitted to the intelligent switch 24, the intelligent switch 24 is closed under the effect of the enabling signal, the enabling resistor 23 is connected with the communication transceiver 22, and enabling of the enabling resistor 23 is completed.

In the embodiment of the present disclosure, if the output port 6 of the communication device 200 is connected to an external power source, the external power source sends a first current to the output side circuit 6, the first current is divided by the third resistor 19 to form a third voltage division signal, the third voltage division signal acts on the base of the second triode 10, and the second triode 10 is turned on under the action of the third voltage division signal and the fourth voltage division signal to obtain a second current. The second pin 12 of the main control circuit 2 receives a second current transmitted by the second transistor 10, the voltage of the second current is lower than the second high-order signal, and the second pin 12 is converted from a high level to a low level, namely the first pin 11 or the high level. The main control circuit 2 determines that the communication device 200 where the enabling circuit 100 is located is a terminal device and forms an enabling signal to be transmitted to the intelligent switch 24, the intelligent switch 24 is closed under the effect of the enabling signal, the enabling resistor 23 is connected with the communication transceiver 22, and enabling of the enabling resistor 23 is completed.

In the disclosed embodiment of the present invention, the communication transceiver 22 inside the communication device 200 may include an RS485 bus communication transceiver 22 or a CAN bus communication transceiver 22. In the disclosed embodiment of the present invention, the enabling resistor 23 may also be replaced by an enabling coil or an enabling capacitor.

In the embodiment of the present disclosure, the first transistor 8 of the enabling circuit 100 is connected in parallel with the first resistor 17 to limit the current of the first transistor 8 and protect the first transistor 8, and the first internal power supply 7 is connected in series with the second resistor 18 to also protect the first transistor 8. The parallel connection of the second transistor 10 and the third resistor 19 of the enabling circuit 100 may function to limit the current of the second transistor 10 to protect the second transistor 10, and the series connection of the second internal power supply 9 and the fourth resistor 21 may also function to protect the second transistor 10.

The disclosed embodiment of the invention provides an enable circuit 100. Fig. 5 is a block diagram of an enable circuit 100 according to an embodiment of the present invention.

In the disclosed embodiment of the present invention, an input side circuit 1 includes: a first internal power supply 7 and a first field effect transistor 14, a first diode 16, a first resistor 17 and a second resistor 18; the input port 5 is respectively connected with a first end of a first diode 16, a first end of a first resistor 17 and a gate of the first field effect transistor 14, and a second end of the first diode 16 is connected with a second end of the first resistor 17 and then grounded; the first internal power supply 7 is connected with a first end of a second resistor 18, a second end of the second resistor 18 is respectively connected with a drain electrode of the first field effect transistor 14 and the first pin 11, and a source electrode of the first field effect transistor 14 is grounded; the first internal power supply 7 transmits a first high-order signal to the second resistor 18, and the level value of the first pin 11 is higher than a level threshold value;

in the disclosed embodiment of the present invention, the output side circuit 3 includes: a second internal power supply 9 and a second field effect transistor 15, a second diode 20, a third resistor 19 and a fourth resistor 21; the output port 6 is respectively connected with a first end of a second diode 20, a first end of a third resistor 19 and a grid electrode of the second field effect transistor 15, and a second end of the second diode 20 and a second end of the third resistor 19 are grounded after being connected; the second internal power supply 9 is connected with a first end of a fourth resistor 21, a second end of the fourth resistor 21 is respectively connected with a drain electrode of the second field effect transistor 15 and the second pin 12, and a source electrode of the second field effect transistor 15 is grounded; the second internal power supply 9 transmits a second high-order signal to the fourth resistor 21, and the level value of the second pin 12 is higher than the level threshold value;

In the disclosed embodiment of the present invention, if the input port 5 of the communication device 200 as a terminal device is connected to an external power supply of another communication device 200, and the output port 6 is not connected to an external power supply of another communication device 200, the external power supply sends a first current to the input side circuit 1, the first current is divided by the first resistor 17 to form a first divided voltage signal, and the first divided voltage signal acts on the gate of the first field-effect transistor 14; the first high-order signal is divided by the second resistor 18 to form a second voltage division signal, the second voltage division signal acts on the drain electrode of the first field effect transistor 14, the first field effect transistor 14 is conducted under the action of the first voltage division signal and the second voltage division signal to obtain a second current, the second current is transmitted to the first pin 11, the first pin 11 is converted from a high level to a low level, and the second pin 12 is also a high level. The main control circuit 2 determines that the communication device 200 where the enabling circuit 100 is located is a terminal device and forms an enabling signal, the main control circuit 2 transmits the enabling signal to the intelligent switch 24 through the third pin 13, the intelligent switch 24 is closed under the effect of the enabling signal, the enabling resistor 23 is connected with the communication transceiver 22, and enabling of the enabling resistor 23 is completed.

In the embodiment of the present disclosure, if the output port 6 of the communication device 200 serving as a terminal device is connected to an external power supply of another communication device 200, and the input port 5 is not connected to an external power supply of another communication device 200, the external power supply sends a first current to the output side circuit 3, the first current is divided by the third resistor 19 to form a third divided voltage signal, and the third divided voltage signal acts on the gate of the second fet 15; the second high-order signal is divided by the fourth resistor 21 to form a fourth voltage dividing signal, the fourth voltage dividing signal acts on the drain electrode of the second field effect transistor 15, the second field effect transistor 15 is conducted under the action of the third voltage dividing signal and the fourth voltage dividing signal to obtain a second current, the second current is transmitted to the second pin 12, the second pin 12 is converted from a high level to a low level, and the first pin 11 is also at the high level. The main control circuit 2 determines that the communication device 200 where the enabling circuit 100 is located is a terminal device and forms an enabling signal, the main control circuit 2 transmits the enabling signal to the intelligent switch 24 through the third pin 13, the intelligent switch 24 is closed under the effect of the enabling signal, the enabling resistor 23 is connected with the communication transceiver 22, and enabling of the enabling resistor 23 is completed.

In the embodiment of the present disclosure, before the input port 5 and the output port 6 of the communication device 200 are connected to the external power supply of another communication device 200, the first field effect transistor 14 is not turned on, the first high-order signal sent by the first internal power supply 7 is divided by the second resistor 18 to form a second divided signal, the second divided signal acts on the drain of the first field effect transistor 14, the first pin 11 of the main control circuit 2 receives the second divided signal, and the first pin 11 of the main control circuit 2 is at a high level under the action of the second divided signal. The second field effect transistor 15 is not turned on, the second high-order signal is divided into a fourth voltage dividing signal through the fourth resistor 21, the second pin 12 of the main control circuit 2 receives the fourth voltage dividing signal, the fourth voltage dividing signal acts on the drain electrode of the second field effect transistor 15, the second pin 12 of the main control circuit 2 is at a high level under the action of the fourth voltage dividing signal, and the main control circuit 2 cannot form an enabling signal. If the input port 5 of the communication device 200 is connected to an external power source, the external power source sends a first current to the input side circuit 1, the first current is divided by the first resistor 17 to form a first divided voltage signal, the first divided voltage signal acts on the gate of the first fet 14, and the first fet 14 is turned on under the action of the first divided voltage signal and the second divided voltage signal to obtain a second current. The first pin 11 of the main control circuit 2 receives a second current transmitted by the first field effect transistor 14, the voltage of the second current is lower than that of the second voltage division signal, the first pin 11 is converted from a high level to a low level, and the second pin 12 is also a high level. The main control circuit 2 determines that the communication device 200 where the enabling circuit 100 is located is a terminal device, forms an enabling signal, transmits the enabling signal to the intelligent switch 24 through the third pin 13, the intelligent switch 24 is closed under the effect of the enabling signal, the enabling resistor 23 is connected with the communication transceiver 22, and enabling of the enabling resistor 23 is completed. In the embodiment of the present disclosure, if the output port 6 of the communication device 200 is connected to an external power source, the external power source sends a first current to the output side circuit 3, the first current is divided by the third resistor 19 to form a third voltage division signal, the third voltage division signal acts on the gate of the second field effect transistor 15, and the second field effect transistor 15 is turned on under the action of the third voltage division signal and the fourth voltage division signal to obtain a second current. The second pin 12 of the main control circuit 2 receives a second current transmitted by the second fet 12, the voltage of the second current is lower than the second high-order signal, the second pin 12 is converted from a high level to a low level, and the first pin 11 is also a high level. The main control circuit 2 determines that the communication device 200 where the enabling circuit 100 is located is a terminal device, forms an enabling signal, transmits the enabling signal to the intelligent switch 24 through the third pin 13, the intelligent switch 24 is closed under the effect of the enabling signal, the enabling resistor 23 is connected with the communication transceiver 22, and enabling of the enabling resistor 23 is completed.

The disclosed embodiments of the present invention provide a communication device. Referring to fig. 6, fig. 6 is a structural diagram of a communication device according to an embodiment of the present invention.

In the embodiment of the present disclosure, the communication apparatus includes three communication devices, which are a communication device 200, a communication device 201, and a communication device 202. The communication device 200, the communication device 201, and the communication device 202 of the communication apparatus are connected in order via the input port and the output port of each communication device. That is, the output port 6 of the communication device 200 is connected to the input port 51 of the communication device 201, and the output port 61 of the communication device 201 is connected to the input port 52 of the communication device 202. The communication apparatus 200, the communication apparatus 201, and the communication apparatus 202 are internally provided with the identical enable circuit 100.

In the embodiment of the present disclosure, the communication device 200, the communication device 201, and the communication device 202 are respectively provided therein with the communication transceiver 22, the communication transceiver 53, and the communication transceiver 56. The communication transceiver 22, the communication transceiver 53 and the communication transceiver 56 are interconnected to form a communication link of the communication device.

In the embodiment of the present disclosure, the input port 5 of the communication device 200 includes: a first input port D1, a second input port V1, a third input port A1, and a fourth input port B1. The output port 6 of the communication apparatus 200 includes: a first output port V2, a second output port D2, a third output port a2, and a fourth output port B2. The input port 51 of the communication device 201 includes: a first input port D3, a second input port V3, a third input port A3, and a fourth input port B3. The output port 61 of the communication device 201 includes: a first output port V4, a second output port D4, a third output port a4, and a fourth output port B4. The input port 52 of the communication device 202 includes: a first input port D5, a second input port V5, a third input port A5, and a fourth input port B5. The output port 62 of the communication device 202 includes: a first output port V6, a second output port D6, a third output port a6, and a fourth output port B6. The communication device 200 has a third input port a1 connected to a third output port a2, and a fourth input port B1 connected to a fourth output port B2. The third output port a2 of the communication device 200 is connected to the third input port A3 of the communication device 201 and the fourth output port B2 of the communication device 200 is connected to the fourth input port B3 of the communication device 201. The communication device 201 has a third input port A3 connected to a third output port A4 and a fourth input port B3 connected to a fourth output port B4. The third output port a4 of the communication device 201 is connected to the third input port a5 of the communication device 202, and the fourth output port B4 of the communication device 201 is connected to the fourth input port B5 of the communication device 202. The third input port A5 and the third output port A6 of the communication device 202 are connected, and the fourth input port B5 and the fourth output port B6 are connected. Thus, communication links are formed between the communication device 200, the communication device 201, and the communication device 202. When the communication link length of the communication apparatus is long, the communication signal of the communication apparatus becomes weak, and the communication rate is lowered. At this time, it is necessary to enable the enabling resistances of the communication devices of both terminals of the communication apparatus. I.e. the enabling resistors of the communication devices of the two terminals of the communication apparatus are connected to the communication transceivers of the two terminals. The enabling resistor can absorb reflected waves on the communication link, and the strength of the communication signal is effectively enhanced.

In the disclosed embodiment of the present invention, the first output port V2 of the communication device 200 is connected to the first input port D3 of the communication device 201. The second output port D2 of the communication device 200 is connected to the second input port V3 of the communication device 201. That is, the second output port D2 of the communication device 200 is connected to the second power supply 27 of the second input port V3 of the communication device 201, and the first input port D3 of the communication device 201 is connected to the second power supply 26 of the first output port V2 of the communication device 200. In the embodiment disclosed in the present invention, the second output port D2 of the communication device 200 is connected to the output side circuit 3 inside the communication device 200. The second power supply 27 of the communication device 201 sends a first current to the output side circuit 3 inside the communication device 200, the first current is divided by a third resistor 19 inside the communication device 200 to form a third divided voltage signal, and the third divided voltage signal acts on the base of the second transistor 10; the second high-order signal sent by the second internal power supply 9 is divided by the fourth resistor 21 to form a second divided signal, and the second divided signal acts on the collector of the second triode 10. The second transistor 10 is turned on under the action of the first and second divided voltage signals to obtain a second current, and the second current is transmitted to the second pin 12, and the level value of the second pin 12 is lower than the level threshold. Meanwhile, since the input side circuit 1 inside the communication device 200 is not connected to an external power source, the level value of the first pin 11 is higher than the level threshold value. Therefore, the main control circuit 2 can determine that the communication device 200 where the enabling circuit 100 is located is a terminal device and forms an enabling signal, the main control circuit 2 transmits the enabling signal to the intelligent switch 24 through the third pin 13, the intelligent switch 24 is closed under the effect of the enabling signal, the enabling resistor 23 is connected with the communication transceiver 22, and enabling of the enabling resistor 23 is completed.

Meanwhile, the first output port V4 of the communication device 201 is connected with the first input port D5 of the communication device 202. The second output port D4 of the communication device 201 is connected to the second input port V5 of the communication device 202. I.e. the second output port D4 of the communication device 201 is connected to the fourth power supply 29 of the second input port V5 of the communication device 202. The first input port D3 of the communication device 201 is connected to the first power supply 26 of the first output port V2 of the communication device 200. In the embodiment disclosed in the present invention, the second output port D4 of the communication device 201 is connected to the output side circuit 3 inside the communication device 201, and the first input port V3 of the communication device 201 is connected to the input side circuit 1 inside the communication device 201. Since the input side circuit 1 inside the communication device 201 is connected to the first power supply 26 inside the communication device 200 at this time, the output side circuit 3 inside the communication device 201 is connected to the fourth power supply 29 inside the communication device 202. The level value of the pin connecting the input side circuit 1 and the output side circuit 3 of the control circuit 2 inside the communication device 201 is lower than the level threshold value. The control circuit 2 inside the communication device 201 does not form an enable signal, and the enable resistor 54 inside the communication device 201 is not connected to the communication transceiver 53 inside the communication device 201.

In the embodiment disclosed in the present invention, the first input port V5 of the communication device 202 is connected to the input side circuit 1 inside the communication device 202. The third power supply 28 of the communication device 201 sends a first current to the input side circuit 1 inside the communication device 202, the first current is divided by a first resistor 41 inside the communication device 202 to form a first divided voltage signal, and the first divided voltage signal acts on the base of the first transistor 82; the first high-order signal is divided by the second resistor 42 to form a second divided voltage signal, the second divided voltage signal acts on a collector of the first triode 82, the first triode 82 is conducted under the action of the first divided voltage signal and the second divided voltage signal to obtain a second current, and the second current is transmitted to the first pin 43, so that the level value of the first pin 43 is lower than the level threshold value. Meanwhile, since the output side circuit 3 inside the communication device 202 is not connected to the external power source, the level value of the second pin 44 of the communication device 202 is higher than the level threshold value. The master control circuit 2 inside the communication device 202 can determine that the communication device 202 is a terminal device and form an enable signal. The main control circuit 2 inside the communication device 202 transmits an enable signal to the intelligent switch 58 through the third pin 45, and the enable resistor 57 is enabled under the effect of the enable signal. The communication transceiver 56 of the communication device 202 as a terminal device is connected to the enable resistor 57. The communication transceivers of the communication device 200 and the communication device 202 of both terminals of the communication apparatus are connected with the enabling resistor, so that the communication signal in the communication link of the communication apparatus is enhanced.

In the embodiment of the invention, the communication device comprises three communication devices which are connected in sequence, and each communication device is connected with other communication devices on the input port side or/and the output port side of the communication device through an internal enabling circuit. The power supply inside the communication equipment in the middle sends a first current to the enabling circuit inside the terminal equipment, the enabling circuit enables a pin on one side of a control circuit inside the enabling circuit to be converted from a high level to a low level based on the first current, the pin on the other side is also the high level, and the control circuit accordingly sends an enabling signal to enable an enabling resistor inside the control circuit. When only one side of one communication device is connected with other communication devices, the enabling circuit can quickly and efficiently determine the terminal device, and enables the electronic device in the communication device according to the external power supply of one side connected with other communication devices, so that the enabling steps of the electronic device are simplified, and the communication signal of the communication device is enhanced.

The above description is only for the embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An enable circuit, comprising: the circuit comprises an input side circuit, an output side circuit and a main control circuit;

the main control circuit is connected with the electronic device; if the input port or the output port is connected with an external power supply, the input side circuit or the output side circuit enables the level value of one pin of the main control circuit connected with the input side circuit and the output side circuit to be lower than a level threshold value based on the external power supply, the level value of the other pin is higher than the level threshold value due to the fact that the other pin is not acted by the external power supply, the main control circuit accordingly determines that the communication equipment where the enabling circuit is located is terminal equipment and generates an enabling signal, the main control circuit transmits the enabling signal to the electronic device, and the electronic device is enabled under the action of the enabling signal; wherein the content of the first and second substances,

the external power supply is connected with the terminal equipment; the terminal device is a communication device at the head end and the tail end in a communication link in which at least two communication devices are sequentially connected.

2. The enable circuit of claim 1, wherein the master circuit comprises a first pin, a second pin, and a third pin;

3. The enabling circuit of claim 2, wherein the external power source is connected to the first pin or the second pin of the main control circuit through the input side circuit or the output side circuit;

4. The enable circuit of claim 2, wherein the input side circuit comprises: a first internal power supply and a first triode;

5. The enable circuit of claim 4, wherein the input side circuit further comprises: the circuit comprises a first diode, a first resistor and a second resistor;

6. The enable circuit of claim 2, wherein the output side circuit comprises: a second internal power supply and a second triode;

if the external power supply is connected with the output port and sends a first current to the base electrode of the second triode, the second triode is conducted under the action of the first current and the second high-order signal to obtain a second current, the second current acts on the second pin, and the level value of the second pin is lower than the level threshold under the action of the second current.

7. The enable circuit of claim 6, wherein the output side circuit further comprises: a second diode, a third resistor and a fourth resistor;

8. The enable circuit of claim 2, wherein the input side circuit comprises: the power supply comprises a first internal power supply, a first triode and a first field effect transistor;

if the external power supply is connected with the input port and sends a first current to the grid electrode of the first field effect transistor, the first field effect transistor is conducted under the action of the first current and the first high-order signal to obtain a second current, the second current acts on the first pin, and the level value of the first pin is lower than the level threshold under the action of the second current.

9. The enable circuit of claim 8, wherein the input side circuit further comprises: the circuit comprises a first diode, a first resistor and a second resistor;

10. The enable circuit of claim 2, wherein the output side circuit comprises: a second internal power supply and a second field effect transistor;

if the external power supply is connected with the output port and sends a first current to the grid electrode of the second field effect transistor, the second field effect transistor is conducted under the action of the first current and the second high-order signal to obtain a second current, the second current acts on the second pin, and the level value of the second pin is lower than the level threshold under the action of the second current.

11. The enable circuit of claim 10, wherein the output side circuit further comprises: a second diode, a third resistor and a fourth resistor;

12. The enable circuit of claim 2, wherein the electronic device comprises: enabling a resistor and an intelligent switch;

13. A communication apparatus, comprising a plurality of communication devices connected in sequence, each of the communication devices having an enabling circuit according to any one of claims 1 to 12 disposed therein, the enabling circuit in each of the communication devices being connected to a communication transceiver in the corresponding communication device; the communication transceiver in each communication device is connected with the electronic device in the corresponding communication device;