CN109743052B - Isolation communication circuit for realizing self-checking - Google Patents
Isolation communication circuit for realizing self-checking Download PDFInfo
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- CN109743052B CN109743052B CN201910161332.0A CN201910161332A CN109743052B CN 109743052 B CN109743052 B CN 109743052B CN 201910161332 A CN201910161332 A CN 201910161332A CN 109743052 B CN109743052 B CN 109743052B
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- 238000004891 communication Methods 0.000 title claims abstract description 31
- 238000002955 isolation Methods 0.000 title abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 40
- 230000008054 signal transmission Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 abstract description 36
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Abstract
The invention provides an isolation communication circuit for realizing self-checking, which relates to the technical field of communication, and comprises: the device comprises a sending module, a level conversion module and a receiving module; the transmitting module is used for receiving the transmitting signal of the input end of the transmitting module and transmitting the transmitting signal to the level conversion module; the level conversion module is used for carrying out level conversion on the input signal and transmitting the transmission signal after the level conversion to the receiving module; and the receiving module is used for receiving the level-converted transmission signal. The transmitting signals at the input end of the transmitting module are converted and transmitted to the receiving module through the level conversion module through the transmitting module, the level conversion module and the receiving module, and the receiving module outputs the received signals, so that whether a self-checking circuit has faults or not in the communication process is realized, and information of transmission errors is avoided.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an isolated communication circuit for realizing self-checking.
Background
The universal serial port is used as a simple and applicable communication interface, and is transmitted one by one in the data and control information transmission process, so that the transmission distance is long, and the universal serial port plays an irreplaceable role in the communication field.
The existing communication serial port circuit can not realize self-checking of the circuit in the communication process, and when the circuit has problems, the circuit can not be found out in time, so that wrong information is received, and the work is influenced.
Disclosure of Invention
The invention aims to provide an isolated communication circuit for realizing self-checking, which solves the problems that when a communication serial port circuit has problems in the communication process, the communication serial port circuit cannot be found in time, and the error information is received, so that the work is influenced.
To solve the above technical problems, an embodiment of the present invention provides an isolated communication circuit for implementing self-checking, including: the device comprises a sending module, a level conversion module and a receiving module; the transmitting module is used for receiving a transmitting signal of the input end of the transmitting module and transmitting the transmitting signal to the level conversion module; the level conversion module is used for carrying out level conversion on the input signal and transmitting a sending signal after the level conversion to the receiving module; the receiving module is used for receiving the level-converted sending signal.
In an embodiment, the sending module includes: a first optocoupler and a first resistor, the first optocoupler comprising: the first infrared light emitting diode and the first phototriode; the cathode of the first infrared light-emitting diode is connected to the input end of the sending module through the first resistor, and the anode of the first infrared light-emitting diode is connected with the anode of the second power supply; and the emitter electrode of the first photoelectric triode is grounded.
In one embodiment, the level shift module includes: a first triode and a fifth resistor; and the base electrode of the first triode is connected with the collector electrode of the first photoelectric triode through the fifth resistor.
In an embodiment, the level shift module further comprises: the second resistor, the third resistor, the seventh resistor and the second diode; one end of the second resistor is connected with the collector electrode of the first phototriode, and the other end of the second resistor is connected with the emitter electrode of the first triode; the anode of the second diode is connected with the collector of the first triode, and the cathode of the second diode is connected with the input end of the receiving module through the seventh resistor and the third resistor.
In an embodiment, the emitter of the first triode is further connected with the positive electrode of the first power supply; the negative electrode of the first power supply is grounded.
In one embodiment, the isolated communication circuit for implementing self-test further comprises: and one end of the signal transmission line is connected between the third resistor and the seventh resistor, and the other end of the signal transmission line is externally connected with a communication circuit.
In an embodiment, the receiving module includes: and the second photoelectric coupler is connected with the second power supply.
In an embodiment, the receiving module further comprises: a fourth resistor; the second photocoupler includes: the second infrared light emitting diode and the second phototriode; the anode of the second infrared light-emitting diode is connected with the third resistor; the cathode of the second infrared light-emitting diode is grounded; the collector electrode of the second phototriode is connected with the anode of the second power supply through the fourth resistor; and the emitter of the second phototriode is connected with the cathode of the first power supply.
In an embodiment, the receiving module further comprises: a first diode and a sixth resistor; the anode of the first diode is connected with the cathode of the second infrared light-emitting diode, and the cathode of the first diode is connected with the anode of the second infrared light-emitting diode; the sixth resistor is connected in parallel with two ends of the first diode.
In an embodiment, the receiving module further comprises: and the output signal end is connected with the collector electrode of the second phototriode.
The technical scheme of the invention has the following beneficial effects:
The embodiment of the invention provides an isolated communication circuit for realizing self-checking, which comprises the following components: the device comprises a sending module, a level conversion module and a receiving module; the transmitting module is used for receiving a transmitting signal of the input end of the transmitting module and transmitting the transmitting signal to the level conversion module; the level conversion module is used for carrying out level conversion on the input signal and transmitting a sending signal after the level conversion to the receiving module; the receiving module is used for receiving the level-converted sending signal. The transmitting signals at the input end of the transmitting module are converted and transmitted to the receiving module through the level conversion module through the transmitting module, the level conversion module and the receiving module, and the receiving module outputs the received signals, so that whether a self-checking circuit has faults or not in the communication process is realized, and information of transmission errors is avoided.
The signal is sent by the sending module through the first photoelectric coupler, the signal is received by the receiving module through the second photoelectric coupler, and the input and output ends of the first photoelectric coupler and the second photoelectric coupler have the characteristic of signal isolation, so that the electric-optical-electric conversion process is realized in the transmission process, and the electric-optical-electric conversion device has good electric insulation performance and anti-interference capability.
Drawings
FIG. 1 shows a schematic block diagram of a specific example of an embodiment of the present invention;
FIG. 2 is a circuit diagram of an isolated communication circuit for implementing self-test according to one embodiment of the present invention;
FIG. 3 shows a communication diagram of two isolated communication circuits for implementing self-test according to an embodiment of the present invention.
The main reference numerals illustrate:
V1-a first power supply; v2-a second power supply; r1-a first resistor; r2-a second resistor; r3-a third resistor; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; r7-seventh resistor; d1-a first diode; d2—a second diode; q1-a first triode; u5-a first photoelectric coupler; u3-a second photoelectric coupler; c-signal transmission line.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, an embodiment of the present invention provides an isolated communication circuit for implementing self-checking, including: the device comprises a sending module, a level conversion module and a receiving module; the transmitting module is used for receiving the transmitting signal of the input end of the transmitting module and transmitting the transmitting signal to the level converting module; the level conversion module is used for carrying out level conversion on the input signal and transmitting the transmission signal after the level conversion to the receiving module; and the receiving module is used for receiving the level-converted transmission signal.
Through the sending module, the level conversion module and the receiving module, the communication circuit provided by the embodiment of the invention converts and sends the sending signal at the input end of the sending module to the receiving module through the level conversion module, and the receiving module outputs the received signal, so that whether the self-checking circuit has faults in the communication process is realized, and the information of transmission errors is avoided.
In one embodiment, as shown in fig. 2, the sending module includes: a first photo coupler U5 and a first resistor R1, the first photo coupler U5 comprising: the first infrared light emitting diode and the first phototriode; the cathode of the first infrared light-emitting diode is connected to the input end of the sending module through a first resistor R1, so that the first resistor R1 can divide voltage to protect the first infrared light-emitting diode from damage; the anode of the first infrared light-emitting diode is connected with the anode of the second power supply V2 to give a high level to the anode of the first infrared light-emitting diode; the emitter of the first phototriode is grounded and is given a low level.
After the input end of the transmitting module inputs a signal, the input signal is transmitted to the cathode of the first infrared light emitting diode of the first photoelectric coupler U5 through the first resistor R1, and the signal is transmitted to the level converting module through the collector of the first phototriode of the first photoelectric coupler U5.
In one embodiment, the level shift module includes: the first triode Q1, the fifth resistor R5, the second resistor R2, the third resistor R3, the seventh resistor R7 and the second diode D2; the base electrode of the first triode Q1 is connected with the collector electrode of the first photoelectric triode through a fifth resistor R5 and is used for receiving signals output by the transmitting module.
One end of the second resistor R2 is connected with the collector electrode of the first phototriode, the other end of the second resistor R2 is connected with the emitter electrode of the first triode, the emitter electrode of the first triode Q1 is also connected with the positive electrode of the first power supply V1, and the negative electrode of the first power supply V1 is grounded; in this way, the signal output by the transmitting module is transmitted to the level conversion module, and the level conversion module converts the signal output by the transmitting module;
The anode of the second diode is connected with the collector of the first triode, and the cathode of the second diode is connected with the input end of the receiving module through a seventh resistor and a third resistor, so that an output signal of the level conversion module is transmitted to the receiving module; the third resistor R3 and the seventh resistor R7 are both voltage dividing resistors, and the second diode D2 can prevent current from flowing back and burn out Q1, so as to protect the circuit.
In one embodiment, the first transistor Q1 is a PNP transistor.
In an embodiment, a signal transmission line C for outputting a signal is further disposed between the third resistor R3 and the seventh resistor R7, and the signal transmission line C may transmit a transmission signal received by the transmission module to another device, or may receive a signal transmitted by another device, so as to implement a communication function.
In an embodiment, the receiving module includes: a second photo coupler U3, a fourth resistor R4, a first diode D1 and a sixth resistor R6;
Wherein the second photo coupler U3 includes: the second infrared light emitting diode and the second phototriode; the anode of the second infrared light-emitting diode is connected with a third resistor R3 and is used for receiving signals output by the level conversion module; the cathode of the second infrared light emitting diode is grounded, so that when the anode of the second infrared light emitting diode is at a high level, the second infrared light emitting diode is in a conducting state; the collector of the second phototriode is connected with the positive electrode of the second power supply V2 through the fourth resistor R4, and the emitter of the second phototriode is connected with the negative electrode of the second power supply V1, so that when the second photoelectric coupler U3 is conducted, the emitter and the collector of the second phototriode are both in a low level state.
The anode of the first diode D1 is connected with the cathode of the second infrared light-emitting diode, the cathode of the first diode D1 is connected with the anode of the second infrared light-emitting diode, and the sixth resistor R6 is connected in parallel with the two ends of the first diode D1; the first diode D1 and the sixth resistor R6 function to reduce waveform distortion.
In an embodiment, the receiving module further includes: and the output signal end is connected with the collector electrode of the second phototriode and is used for outputting the transmission signal input by the input end of the transmission module.
According to the isolation communication circuit for realizing self-checking, the signal is sent by the sending module through the first photoelectric coupler U5, the signal is received by the receiving module through the second photoelectric coupler U3, the input and output ends of the first photoelectric coupler U5 and the second photoelectric coupler U3 have the characteristic of signal isolation, and the electric-optical-electric conversion process is realized in the transmission process, so that the isolation communication circuit has good electric insulation performance and anti-interference capability.
In summary, the transmission signal at the transmission input end of the transmission module is transmitted to the level conversion module through the first resistor R1 and the first photo coupler U5, the transmission signal transmitted by the transmission module is level-converted through the level conversion module, and then the transmission signal after the level conversion is transmitted to the second photo coupler U3 of the receiving module, and the transmission signal at the input end of the transmission module is output through the second photo coupler U3.
The specific self-checking process is that when a transmission signal of a transmission input end of a transmission module is at a low level, namely, a low level is input to a cathode of a first infrared light emitting diode through a first resistor R1, and as an anode of the first infrared light emitting diode is connected with an anode of a second power supply V2, the anode of the first infrared light emitting diode is at a high level, the first infrared light emitting diode emits light, an emitter of a first photoelectric triode is grounded and is in a low level state, and a collector of the first photoelectric triode is also in a low level state; because the base electrode of the first transistor Q1 is connected with the collector electrode of the first photoelectric triode through the fifth resistor R5, the emitter electrode of the first transistor Q1 is connected with the positive electrode of the first power supply V1, the first transistor Q1 is conducted, and the collector electrode of the first transistor Q1 is in a high level state; the anode of the second infrared light emitting diode is connected with the collector electrode of the first transistor Q1 through the third resistor R3 and the seventh resistor R7, so that the anode of the second infrared light emitting diode is also in a high level, and the cathode of the second infrared light emitting diode is grounded, so that the second infrared light emitting diode emits light, namely the second photoelectric coupler U3 is conducted; the emitter of the second phototransistor is connected to the negative electrode of the second power supply V2 and is in a low level state, so that the collector of the second phototransistor is also in a low level state, and the output signal is low, that is, the output signal of the receiving unit is low.
When the transmission signal of the transmission input end of the transmission module is at a high level, namely, a high level is input to the cathode of the first infrared light emitting diode through the second resistor R2, the anode of the first infrared light emitting diode is connected with the anode of the second power supply V2, so that the anode of the first infrared light emitting diode is at a high level, the first infrared light emitting diode does not emit light, namely, is not conducted, the base electrode of the first photoelectric transistor is at a low level, the collector electrode of the first photoelectric transistor is connected with the anode of the first power supply V1 through the second resistor R2 and is at a high level, and the base electrode of the first transistor Q1 is connected with the collector electrode of the first photoelectric transistor through the fifth resistor R5 and is at a high level, the emitter of the first transistor Q1 is connected with the anode of the first power supply V1 and is also at a high level, so that the first transistor Q1 is not conducted, and the collector electrode of the first transistor Q1 is at a low level state; the anode of the second infrared light emitting diode is connected with the collector electrode of the first transistor Q1 through the third resistor R3 and the seventh resistor R7, so that the anode of the second infrared light emitting diode is also in a low level, and the cathode of the second infrared light emitting diode is grounded, so that the second infrared light emitting diode does not emit light, namely the second photoelectric coupler U3 is not conducted; because the emitter of the second phototriode is connected with the cathode of the second power supply V2 and is in a low level state, the collector of the second phototriode is connected with the anode of the second power supply V2 through the fourth resistor R4, and the collector of the second phototriode is in a high level, so that the output signal is in a high level, namely the output signal of the receiving unit is in a high level.
As can be seen from this, when the transmission signal at the transmission input end of the transmission module is at the high level, the output signal of the receiving unit is also at the high level; when the transmission signal of the transmission input terminal of the transmission module is at a low level, the output signal of the receiving unit is also at a low level.
In the self-checking process, when the levels of the sending signal and the output signal are inconsistent, the circuit provided by the invention is proved to be faulty, and when the levels of the sending signal and the output signal are consistent, the circuit provided by the invention is proved to be normal.
In the use process, the device for sending the signal to the input end of the sending module can be a signal generator or a singlechip, namely, the device connected with the TXD end shown in fig. 2 is a signal generator, and the device for receiving the signal at the output end of the receiving module, namely, the device connected with the RXD end shown in fig. 2 can also be a signal receiver or a singlechip; the device for transmitting signals at the input end of the transmitting module and the device for receiving signals at the output end of the receiving module can be the same single chip microcomputer, so that spontaneous self-receiving is realized; or two singlechips, one is used for sending signals and the other is used for receiving signals; of course, the device for transmitting signals at the input end of the transmitting module is not limited to a signal generator and a singlechip; the device for receiving signals at the output end of the receiving module is not limited to a signal receiver and a singlechip.
It should be noted that, in one embodiment of the present invention, the voltages of the first power source V1 and the second power source V2 may be 3.3V and 12V; the first resistor R1 has a resistance of 510 ohms, the second resistor R2 has a resistance of 5 kiloohms, the third resistor R3 has a resistance of 3 kiloohms, the fourth resistor R4 has a resistance of 5 kiloohms, the fifth resistor R5 has a resistance of 10 kiloohms, the sixth resistor R6 has a resistance of 5 kiloohms, and the seventh resistor R7 has a resistance of 2 kiloohms. Of course, the voltage of the first power supply V1 and the voltage of the second power supply V2 may be other values without affecting the use effect of the present invention; the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7 may have other values.
As shown in fig. 3, two schematic circuit communication diagrams provided by the present invention are omitted, wherein a line parallel to the signal transmission line C is a ground line; the signal transmission line C transmits the signal of the first circuit to the second circuit or transmits the signal of the second circuit to the first circuit, so that the signal transmission is realized.
In the communication process, the first circuit and the second circuit cannot communicate at the same time, and only a signal can be sent to the second circuit through the first circuit or sent to the first circuit through the second circuit.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (5)
1. An isolated communication circuit for implementing self-test, comprising: a transmitting module,
A level conversion module and a receiving module;
The transmitting module is used for receiving a transmitting signal of the input end of the transmitting module and transmitting the transmitting signal to the level conversion module;
the level conversion module is used for carrying out level conversion on the sending signal and transmitting the sending signal after the level conversion to the receiving module;
the receiving module is used for receiving the level-converted transmitting signal;
the transmitting module includes: a first optocoupler and a first resistor, the first optocoupler comprising: the first infrared light emitting diode and the first phototriode;
The cathode of the first infrared light-emitting diode is connected to the input end of the sending module through the first resistor, and the anode of the first infrared light-emitting diode is connected with the anode of the second power supply;
The emitter electrode of the first photoelectric triode is grounded;
The level shift module includes: a first triode and a fifth resistor;
the base electrode of the first triode is connected with the collector electrode of the first photoelectric triode through the fifth resistor;
The level shift module further includes: the second resistor, the third resistor, the seventh resistor and the second diode;
One end of the second resistor is connected with the collector electrode of the first phototriode, and the other end of the second resistor is connected with the emitter electrode of the first triode;
The anode of the second diode is connected with the collector of the first triode, and the cathode of the second diode is connected with the input end of the receiving module through the seventh resistor and the third resistor;
the receiving module includes: the second photoelectric coupler is connected with the second power supply;
the receiving module further includes: a fourth resistor; the second photocoupler includes: the second infrared light emitting diode and the second phototriode;
The anode of the second infrared light-emitting diode is connected with the third resistor;
the cathode of the second infrared light-emitting diode is grounded;
The collector electrode of the second phototriode is connected with the anode of the second power supply through the fourth resistor;
The emitter of the second phototriode is connected with the cathode of the second power supply
The first resistor, the third resistor and the seventh resistor are all voltage dividing resistors.
2. The isolated communication circuit for implementing self-test as claimed in claim 1, wherein the emitter of the first triode is further connected to the positive pole of the first power supply;
The negative electrode of the first power supply is grounded.
3. The isolated communication circuit for implementing self-test of claim 1, further comprising: and one end of the signal transmission line is connected between the third resistor and the seventh resistor, and the other end of the signal transmission line is externally connected with a communication circuit.
4. The isolated communication circuit of claim 1, wherein the receiving module further comprises: a first diode and a sixth resistor;
The anode of the first diode is connected with the cathode of the second infrared light-emitting diode, and the cathode of the first diode is connected with the anode of the second infrared light-emitting diode;
the sixth resistor is connected in parallel with two ends of the first diode.
5. The isolated communication circuit of claim 1, wherein the receiving module further comprises: and the output signal end is connected with the collector electrode of the second phototriode.
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| CN201910161332.0A CN109743052B (en) | 2019-03-04 | 2019-03-04 | Isolation communication circuit for realizing self-checking |
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| CN106992777A (en) * | 2017-04-06 | 2017-07-28 | 中国电子科技集团公司第二十四研究所 | Photoelectric-isolated transceiver based on integrative packaging |
| CN107395243A (en) * | 2017-08-21 | 2017-11-24 | 浙江曼瑞德舒适系统有限公司 | A kind of single-wire communication circuit |
| CN207010674U (en) * | 2017-08-21 | 2018-02-13 | 浙江曼瑞德舒适系统有限公司 | A kind of single-wire communication circuit |
| CN210016448U (en) * | 2019-03-04 | 2020-02-04 | 曼瑞德智能系统(上海)股份有限公司 | Isolation communication circuit for realizing self-checking |
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| CN109743052A (en) | 2019-05-10 |
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