CN216599583U

CN216599583U - Communication circuit, electronic equipment and communication system

Info

Publication number: CN216599583U
Application number: CN202122562347.3U
Authority: CN
Inventors: 彭东
Original assignee: Shenzhen Topband Co Ltd
Current assignee: Shenzhen Topband Co Ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2022-05-24
Anticipated expiration: 2031-10-22

Abstract

The utility model relates to a communication circuit, an electronic device and a communication system, comprising: the device comprises a communication transmitting unit, a communication receiving unit, a communication transmitting unit, a control level output unit, a voltage generating unit, a power supply unit, a first switch unit and a second switch unit; the first end of the first switch unit is connected with the communication transmitting unit, the second end of the first switch unit is connected with the second end of the voltage generating unit, the second end of the second switch unit and the communication transmission unit, and the third end of the first switch unit is grounded; the first end of the voltage generation unit is connected with the power supply unit; the first end of the second switch unit is connected with the control level output unit, and the third end of the second switch unit is connected with the communication receiving unit. The utility model can reduce the interference in three-wire communication and improve the data transmission quality.

Description

Communication circuit, electronic equipment and communication system

Technical Field

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

Background

In a traditional serial port UART communication circuit, four signal wires of a power supply, a signal ground wire, data receiving and data sending are required to be connected to realize mutual communication, and the communication of the whole system can be completed only by connecting the four wires. Currently, in order to reduce the cost, three-wire serial communication is adopted. In the current three-wire serial port communication mode, the serial port is directly connected with the port of the MCU controller for data communication, so that the current three-wire serial port communication mode is easily interfered by the outside in the data transmission process, and the problems of low serial port communication rate, hardware communication interruption conflict and the like are easily caused.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a communication circuit, an electronic device, and a communication system, which overcome some of the above technical disadvantages of the prior art.

The technical scheme adopted by the utility model for solving the technical problems is as follows: constructing a communication circuit comprising: the device comprises a communication transmitting unit, a communication receiving unit, a communication transmission unit, a control level output unit, a first switch unit, a second switch unit, a voltage generating unit and a power supply unit;

the first end of the first switch unit is connected with the communication transmitting unit, the second end of the first switch unit is connected with the second end of the voltage generating unit, and the third end of the first switch unit is grounded;

the second end of the voltage generation unit is also connected with the second end of the second switch unit and the communication transmission unit, and the first end of the voltage generation unit is connected with the power supply unit;

the first end of the second switch unit is connected with the control level output unit, and the third end of the second switch unit is connected with the communication receiving unit;

the communication transmitting unit is used for generating communication data, and the first switching unit is used for switching off when the communication data is at a high level and switching on when the communication data is at a low level; the control level output unit is used for outputting a control level, and the second switch unit receives the control level to be switched on or switched off.

Preferably, in a communication circuit of the present invention, the first switching unit includes a first sub-switch and a second sub-switch;

the first end of the first sub-switch is connected with the communication transmitting unit, the second end of the first sub-switch is connected with the power supply unit, the third end of the first sub-switch is connected with the first end of the second sub-switch, the second end of the second sub-switch is connected with the communication transmission unit, and the third end of the second sub-switch is grounded.

Preferably, in a communication circuit of the present invention, the first sub-switch includes a first resistor, a second resistor, and a first transistor; a base electrode of the first triode is connected with a first end of the first resistor and a first end of the second resistor, a second end of the first resistor is connected with the communication transmitting unit, an emitting electrode of the first triode is connected with a second end of the second resistor and the power supply unit, and a collector electrode of the first triode is connected with the second sub-switch; and/or

The second sub switch comprises a third resistor, a fourth resistor and a second triode; the base electrode of the second triode is connected with the first end of the third resistor and the first end of the fourth resistor, the second end of the third resistor is connected with the third end of the first sub-switch, the second end of the fourth resistor is grounded with the emitting electrode of the second triode, and the collector electrode of the second triode is connected with the second end of the voltage generation unit.

Preferably, in a communication circuit of the present invention, the voltage generating unit includes a pull-up resistor, a first end of the pull-up resistor is connected to the power supply unit, and a second end of the pull-up resistor is connected to the second end of the first switch unit, the second end of the second switch unit, and the communication transmission unit.

Preferably, in a communication circuit of the present invention, the second switching unit includes a third transistor, a fifth resistor, a sixth resistor, and a seventh resistor;

the base electrode of the third triode is connected with the control level output unit through the fifth resistor, the emitting electrode of the third triode is connected with the second end of the voltage generation unit, the collecting electrode of the third triode is connected with the first end of the sixth resistor and the first end of the seventh resistor, the second end of the sixth resistor is connected with the communication receiving unit, and the second end of the seventh resistor is grounded.

Preferably, in a communication circuit of the present invention, the communication transmission unit includes a connector;

the first pin of the connector is connected with the power supply unit, the second pin of the connector is connected with the first end of the voltage generation unit, the second end of the first switch unit and the second end of the second switch unit, and the third pin of the connector is grounded.

Preferably, in a communication circuit of the present invention, the communication transmission unit further includes an eighth resistor;

the first end of the eighth resistor is connected with the first end of the voltage generation unit, the second end of the first switch unit and the second end of the second switch unit, and the second end of the eighth resistor is connected with the second pin of the connector.

Preferably, in a communication circuit of the present invention, the communication transmission unit further includes a diode and/or a TVS tube;

the anode of the diode is connected with the first end of the eighth resistor, and the cathode of the diode is connected with the power supply unit;

the first end of the TVS tube is connected with the first end of the eighth resistor, and the second end of the TVS tube is grounded.

Preferably, in a communication circuit of the present invention, the communication circuit further includes a controller, and the communication transmitting unit, the communication receiving unit, and the control level output unit are integrated in the controller.

The utility model also provides an electronic device comprising a communication circuit as described in any of the above.

The present invention also provides a communication system including a first communication module and a second communication module, each of which includes a communication circuit as described in any one of the above, wherein a communication transmission unit in the first communication module and a communication transmission unit of the second communication module are communicatively connected.

Preferably, in the communication system of the present invention, the power supply unit of the second communication module supplies power through the power supply unit of the first communication module.

The communication circuit, the electronic equipment and the communication system have the following beneficial effects that: the interference in three-wire communication is reduced, and the data transmission quality is improved.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram of a communication circuit according to an embodiment of the present invention;

fig. 2 is a circuit schematic of an embodiment of a communication circuit of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1, in a first embodiment of a communication circuit of the present invention, includes: a communication transmitting unit 110, a communication receiving unit 120, a communication transmitting unit 180, a control level output unit 130, a first switching unit 140, a second switching unit 150, a voltage generating unit 160, and a power supply unit 170; a first end of the first switch unit 140 is connected to the communication transmitting unit 110, a second end of the first switch unit 140 is connected to a second end of the voltage generating unit 160, and a third end of the first switch unit 140 is grounded; the second end of the voltage generating unit 160 is further connected to the second end of the second switching unit 150 and the communication transmission unit 180, and the first end of the voltage generating unit 160 is connected to the power supply unit 170; a first end of the second switching unit 150 is connected to the control level output unit 130, and a third end of the second switching unit 150 is connected to the communication receiving unit 120; the communication transmitting unit 110 is configured to generate communication data, and the first switching unit 140 is configured to be turned off when the communication data is at a high level and turned on when the communication data is at a low level; the control level output unit 130 is used for outputting a control level, and the second switch unit 150 receives the control level to turn on or off. Specifically, the communication transmitting unit 110 is used to transmit communication data, and the communication receiving unit 120 is used to receive communication data. The control level output unit 130 is used to output a control level to control the second switch unit 150 to be turned on or off. The communication receiving end and the communication transmission unit 180 may be turned on or off by turning on or off the second switching unit 150. The communication transmission unit 180 serves as an output unit for outputting communication data to an external device when the second switching unit 150 is turned off, and the communication transmission unit 180 serves as an input unit for receiving communication data from the external device when the second switching unit 150 is turned on. Wherein, the control level output unit 130 may output the control level according to the state of the communication transmitting unit 110. When the communication transmitting unit 110 outputs no communication data, the control level output unit 130 is set to output a control level to control the second switch unit 150 to be switched on, and when the communication transmitting unit 110 outputs communication data, the control level output unit 130 is set to output a control level to control the second switch unit 150 to be switched off. The second switching unit 150 may be normally set to an off state by default. When the communication transmitting unit 110 outputs communication data, the first switching unit 140 is turned off when the output communication data is at a high level, and the voltage generating unit 160 generates a high level according to the output voltage of the power supply unit 170; when the communication data is at a low level, the first switch unit 140 is turned on, and at this time, the voltage generation unit 160 is turned on with the ground to generate a low level, the generated high and low level corresponds to the high and low level of the communication data output by the communication transmission unit 110, and finally, the corresponding communication data is output to the external device through the communication transmission unit 180. And the external equipment can realize the receiving of the communication data according to the received high and low levels. When the communication transmitting unit 110 outputs no communication data, the second switching unit 150 is turned on, and the high and low levels received by the communication transmitting unit 180 are still at the corresponding high and low levels due to the voltage stabilizing function of the voltage generating unit 160, that is, the communication receiving unit 120 receives the corresponding high and low levels to obtain the final communication data. By setting the communication transmitting unit 110 to the communication data transmitting state or setting the second switching unit 150 to the off state during the time when data communication is not performed when the communication receiving unit 120 is in a state other than the receiving state, signal interference on the external connection link can be prevented, and the interference resistance of the communication circuit can be improved.

Alternatively, as shown in fig. 2, the first switching unit 140 includes a first sub-switch 141 and a second sub-switch 142; the first terminal of the first sub-switch 141 is connected to the communication transmitting unit 110, the second terminal of the first sub-switch 141 is connected to the power supply unit 170, the third terminal of the first sub-switch 141 is connected to the first terminal of the second sub-switch 142, the second terminal of the second sub-switch 142 is connected to the communication transmitting unit 180, and the third terminal of the second sub-switch 142 is grounded. That is, the first switching unit 140 may be composed of two stages of sub-switches. The first sub-switch 141 is connected to the communication transmitting unit 110, and is turned on or off according to a high-low level of communication data of the communication transmitting unit 110, and is turned off when the communication data is at a high level, and the second sub-switch 142 is turned off when the first sub-switch 141 is turned off. Finally, the first switching unit 140 is in an off state. The first sub-switch 141 is turned on when the communication data is at a low level, and at this time, the power supply of the power supply unit 170 drives the second sub-switch 142 to be turned on, and finally the first switch unit 140 is in a conducting state.

Optionally, the first sub-switch 141 includes a first resistor, a second resistor, and a first transistor; a base electrode of the first triode is connected with a first end of the first resistor and a first end of the second resistor, a second end of the first resistor is connected with the communication transmitting unit 110, an emitting electrode of the first triode is connected with a second end of the second resistor and the power supply unit 170, and a collector electrode of the first triode is connected with the second sub-switch 142; specifically, the first sub-switch 141 may be composed of a first transistor and its peripheral circuit. The base of the first triode is connected to the communication transmitting unit 110, and the base of the first triode is driven to be turned on or off according to the high and low levels of the communication data of the communication transmitting unit 110. In some embodiments, the transistor may be replaced by another switching transistor, such as a MOS transistor. In a specific embodiment, one end of the resistor R4 (corresponding to the first resistor) is connected to the communication transmitting unit 110, the other end is connected to the base of the transistor Q2 (corresponding to the first transistor), and the transistor Q2 is driven to turn on or off by the input level of the resistor R4. One end of the resistor R5 (corresponding to the second resistor) is connected to the base of the transistor Q2, and the other end is connected to the power supply unit 170.

Optionally, the second sub-switch 142 includes a third resistor, a fourth resistor, and a second transistor; the base of the second triode is connected to the first end of the third resistor and the first end of the fourth resistor, the second end of the third resistor is connected to the third end of the first sub-switch 141, the second end of the fourth resistor and the emitter of the second triode are grounded, and the collector of the second triode is connected to the second end of the voltage generating unit 160. Specifically, the second sub switch 142 may be composed of a second transistor and its peripheral circuit. The base of the second transistor is connected to the power supply unit 170 through the first sub-switch 141, and is turned on or off according to the on or off state of the first sub-switch 141. In some embodiments, the transistor may be replaced by another switching transistor, such as a MOS transistor. In one embodiment, the resistor R6 (corresponding to the third resistor) has one end connected to the collector of the transistor Q2, and the other end connected to the base of the transistor Q3 (corresponding to the second transistor) and one end of the resistor R7 (corresponding to the fourth resistor). The other end of the resistor R7 is grounded to the emitter of the transistor Q3. The collector of the transistor Q3 is connected to the voltage generating unit 160.

Optionally, the voltage generating unit 160 includes a pull-up resistor, a first end of the pull-up resistor is connected to the power supply unit 170, and a second end of the pull-up resistor is connected to the second end of the first switching unit 140, the second end of the second switching unit 150, and the communication transmission unit 180. Specifically, the high-low level output of the second terminal voltage of the second switching unit 150 may be implemented by the same pull-up resistor. When the second switching unit 150 is turned off, the pull-up resistor is connected to the power supply unit 170 and at the second end thereof, that is, the communication transmission unit 180 outputs a high level. When the second switch unit 150 is turned on, the second terminal of the second switch unit 150 is grounded, and the second terminal of the pull-up resistor is grounded to a low level at this time, that is, the communication transmission unit 180 correspondingly outputs a low level at this time. The high-low level output of the communication transmission unit 180 is realized. In a specific embodiment, the pull-up resistor may be a resistor R8, one end of the resistor R8 is connected to the power supply unit 170, and the other end is connected to the second end of the first switch unit 140, the second end of the second switch unit 150, and the communication transmission unit 180.

Optionally, the second switch unit 150 includes a third triode, a fifth resistor, a sixth resistor, and a seventh resistor; the base of the third triode is connected with the control level output unit 130 through a fifth resistor, the emitter of the third triode is connected with the second end of the voltage generation unit 160, the collector of the third triode is connected with the first end of a sixth resistor and the first end of a seventh resistor, the second end of the sixth resistor is connected with the communication receiving unit 120, and the second end of the seventh resistor is grounded. Specifically, the second switching unit 150 may be composed of a third transistor and a peripheral circuit thereof. And the base electrode of the third triode is used for receiving the control level output by the control level unit and is switched on or switched off according to the control level. When the third transistor of the communication receiving unit 120 is turned on, the high and low levels are received according to the voltage of the second terminal of the second voltage generating unit 160, and the high and low levels correspond to the communication data. In some embodiments, the transistor may be replaced by another switching transistor, such as a MOS transistor. In one embodiment, the base of the transistor Q4 (corresponding to the third transistor) is connected to the control level output unit 130 via a resistor R9 (corresponding to the fifth resistor), the collector of the transistor Q4 is connected to the communication receiving unit 120 via a resistor R10 (corresponding to the sixth resistor), and the collector of the transistor Q4 is grounded via a resistor R11 (corresponding to the seventh resistor).

Optionally, a first pin of the connector is connected to the power supply unit 170, a second pin of the connector is connected to the first terminal of the voltage generation unit 160, the second terminal of the first switch unit 140, and the second terminal of the second switch unit 150, and a third pin of the connector is grounded. Specifically, the external device may be connected through the connector to realize transmission of communication data with the external device. In one embodiment, the connector may be a conventional serial port connector.

Optionally, the communication transmission unit 180 further includes an eighth resistor; a first terminal of the eighth resistor is connected to the first terminal of the voltage generating unit 160, the second terminal of the first switching unit 140, and the second terminal of the second switching unit 150, and a second terminal of the eighth resistor is connected to the second pin of the connector. Wherein the eighth resistor connects the second terminal of the voltage generating unit 160 and the second pin of the connector, which is used to improve the interference resistance of the communication circuit. In an embodiment, the transistor Q3, the transistor Q4, and the resistor R8 may be connected to the connector CN3 through a resistor R12 (corresponding to the eighth resistor), and the resistor R12 is used to improve the interference resistance during signal transmission of the connector.

Optionally, the communication transmission unit 180 further includes a diode and/or a TVS tube; the anode of the diode is connected with the first end of the eighth resistor, and the cathode of the diode is connected with the power supply unit 170; the first end of TVS pipe is connected with the first end of eighth resistance, and the second end of TVS pipe is grounded. Specifically, in the communication transmission unit 180, a diode is further disposed to connect the second pin of the connector and the power supply unit 170, so as to improve the anti-interference capability of the communication circuit. The TVS tube may also be configured to be connected between the second pin of the connector and ground to improve the immunity of the communication circuit. Wherein the diode and the TVS tube may also be provided simultaneously.

Optionally, in an embodiment, the communication circuit of the present invention further includes a controller, and the communication transmitting unit 110, the communication receiving unit 120, and the control level output unit 130 are integrated in the controller. That is, the controller may be used to generate and output communication data, and may also receive communication data from an external device, and at the same time, it may generate a corresponding control level to control the second switching unit 150 to be turned on or off in an output or receiving state of the communication output. In one embodiment, the controller may employ an MCU chip IC 2.

In addition, an electronic device according to the present invention includes the communication circuit as described above, and the electronic device is provided with the communication circuit to perform data communication with another electronic device.

In addition, the communication system of the present invention includes a first communication module and a second communication module, both of which include the communication circuit as described above, wherein the communication transmission unit 180 of the first communication module is communicatively connected to the communication transmission unit 180 of the second communication module, and the power supply unit 170 of the second communication module can supply power through the power supply unit 170 of the first communication module. Specifically, the communication circuit may be used to form a first communication module and a second communication module, which may perform data communication with each other to form a communication system. In the communication system, the first communication module can be selected as a master device, and the second communication module can be selected as a slave device, wherein the power supply of the slave device can be performed through the master device.

It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A communication circuit, comprising: the device comprises a communication transmitting unit, a communication receiving unit, a communication transmission unit, a control level output unit, a first switch unit, a second switch unit, a voltage generating unit and a power supply unit;

the first end of the second switch unit is connected with the control level output unit, and the third end of the second switch unit is connected with the communication receiving unit.

2. The communication circuit according to claim 1, wherein the first switching unit includes a first sub-switch and a second sub-switch;

3. The communication circuit of claim 2,

the first sub switch comprises a first resistor, a second resistor and a first triode; a base electrode of the first triode is connected with a first end of the first resistor and a first end of the second resistor, a second end of the first resistor is connected with the communication transmitting unit, an emitting electrode of the first triode is connected with a second end of the second resistor and the power supply unit, and a collecting electrode of the first triode is connected with the second sub-switch; and/or

4. The communication circuit according to claim 1, wherein the voltage generation unit includes a pull-up resistor, a first terminal of the pull-up resistor is connected to the power supply unit, and a second terminal of the pull-up resistor is connected to the second terminal of the first switch unit, the second terminal of the second switch unit, and the communication transmission unit.

5. The communication circuit according to claim 1, wherein the second switching unit includes a third transistor, a fifth resistor, a sixth resistor, and a seventh resistor;

6. The communication circuit according to claim 1, wherein the communication transmission unit includes a connector;

7. The communication circuit according to claim 6, wherein the communication transmission unit further comprises an eighth resistor;

8. The communication circuit according to claim 7, wherein the communication transmission unit further comprises a diode and/or a TVS tube;

9. The communication circuit according to claim 1, further comprising a controller, wherein the communication transmitting unit, the communication receiving unit, and the control level outputting unit are integrated with the controller.

10. An electronic device, characterized in that it comprises a communication circuit according to any one of claims 1 to 9.

11. A communication system comprising a first communication module and a second communication module, each comprising a communication circuit according to any one of claims 1 to 9, wherein a communication transmission unit in the first communication module and a communication transmission unit of the second communication module are communicatively connected.

12. The communication system according to claim 11, wherein the power supply unit of the second communication module is powered by the power supply unit of the first communication module.