CN210899200U - Single-wire bidirectional communication circuit - Google Patents
Single-wire bidirectional communication circuit Download PDFInfo
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- CN210899200U CN210899200U CN201922287586.5U CN201922287586U CN210899200U CN 210899200 U CN210899200 U CN 210899200U CN 201922287586 U CN201922287586 U CN 201922287586U CN 210899200 U CN210899200 U CN 210899200U
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Abstract
The utility model relates to a single-wire two-way communication circuit, which is used for connecting a main MCU module and a standby MCU module to realize the two-way communication of the main MCU and the standby MCU, and the main MCU controls a motor in the circuit; the standby MCU controls an alternating current input power supply or a direct current input power supply of the circuit; the circuit comprises a threshold switch module, an isolation module and a clamping module, wherein the threshold switch module is used for receiving a control signal sent by a main MCU or a standby MCU module, shaping the control signal and outputting a corresponding level signal; the isolation module is used for isolating data sent by the main MCU and the standby MCU, and the clamping module is used for limiting the potential of a certain port of the threshold switch module within a preset potential threshold. This application makes main MCU and reserve MCU only need just can realize two-way communication through a serial ports communication foot, simple structure, and the interference killing feature is strong moreover, has effectively practiced thrift MCU pin resource to reduce system cost.
Description
Technical Field
The application relates to the technical field of serial port communication circuits, in particular to a single-wire bidirectional communication circuit.
Background
With the functions of inverters and frequency converters of photovoltaic water pumps increasing, various functional modules are integrated in one system, and in order to implement optional configuration of each functional module, each functional module is usually configured as an independent single board or module, and besides connection between power sources and ground, data interactive communication needs to be implemented between the functional modules.
In the related art, the communication modes between each functional module and the board generally include SPI (serial peripheral Interface), 485 communication, 422 communication, and the like, but these communication modes generally require two signal pins or four signal pins and some additional dedicated communication chips, and the communication modes are complex, and for the communication requirements of limited transmission data and low requirements, the communication modes using the related art have the technical problems of high cost and waste of MCU resources.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems of high cost and MCU resource waste in the communication mode, the embodiment of the application provides a single-wire bidirectional communication circuit.
In view of this, in a first aspect, an embodiment of the present application provides a single-wire bidirectional communication circuit, where the circuit is used to connect a main MCU module and a standby MCU module, so as to implement bidirectional communication between the main MCU module and the standby MCU module, and the main MCU module is used to control a motor in the circuit; the standby MCU module is used for controlling an alternating current input power supply or a direct current input power supply of the circuit; the circuit comprises a threshold switch module, an isolation module and a clamping module, wherein the threshold switch module is used for receiving a control signal sent by a main MCU module or a standby MCU module, shaping the control signal and outputting a corresponding level signal; the isolation module is used for isolating data sent by the main MCU module and the standby MCU module, and the clamping module is used for limiting the potential of a certain port of the threshold switch module within a preset potential threshold.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the threshold switch module employs a 4-bit schmitt inverter.
With reference to the first aspect, in a second possible implementation manner of the first aspect, the 4-bit Schmitt inverter includes a first bit U1-A, a second bit U1-B, a third bit U1-C, and a fourth bit U1-D; the isolation module comprises a fourth diode D4 and a first diode D1; the clamping module comprises a second diode D2 and a third diode D3; the circuit further comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;
an input end of the first bit U1-A is connected with a TX pin of the main MCU module, one end of the first resistor R1 and an anode of the first diode D1, and the other end of the first resistor R1 is connected with a supply voltage VCC;
the output end of the first bit U1-A is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with the anode of the second diode D2 and the input end of the second bit U1-B, the output end of the second bit U1-B is connected with one end of the fourth resistor R4, the cathode of the third diode D3 and the cathode of the fourth diode D4, and the other end of the fourth resistor R4 is connected with a supply voltage VCC;
the positive electrode of the fourth diode D4 is connected to the RX pin of the standby MCU module, the input end of a third bit U1-C, and one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to a supply voltage VCC;
the output end of the third bit U1-C is connected with one end of a fifth resistor R5, the other end of the fifth resistor R5 is connected with the anode of a third diode D3 and the input end of a fourth bit U1-D, the output end of the fourth bit U1-D is connected with one end of a second resistor R2, the cathode of the second diode D2 and the cathode of the first diode D1, and the other end of the second resistor R2 is connected with a power supply voltage VCC.
With reference to the first aspect, in a third possible implementation manner of the first aspect, the first diode D1 is used to isolate data sent by an RX pin of the standby MCU module to a TX pin of the main MCU module.
With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the fourth diode D4 is used to isolate data sent by a TX pin of the main MCU module to an RX pin of the standby MCU module.
With reference to the first aspect, in a fifth possible implementation manner of the first aspect, the third diode D3 is configured to limit a potential of an input end of the fourth bit U1-D of the 4-bit schmitt inverter within a preset potential threshold when the TX pin of the main MCU module transmits data to the RX pin of the standby MCU module, so that an output end of the fourth bit U1-D is at a high level.
With reference to the first aspect, in a sixth possible implementation manner of the first aspect, the second diode D2 is configured to limit a potential of an input end of a second bit U1-B of the 4-bit schmitt inverter within a preset potential threshold when the RX pin of the standby MCU module transmits data to the TX pin of the main MCU module, so that an output end of the second bit U1-B is at a high level.
With reference to the first aspect, in a seventh possible implementation manner of the first aspect, the main MCU module includes a frequency conversion unit, where the frequency conversion unit is configured to adjust a power supply operating frequency of a motor in the circuit.
With reference to the first aspect, in an eighth possible implementation manner of the second aspect, the standby MCU module includes a BOOST unit or a PFC unit, where the BOOST unit is configured to convert a dc voltage of a motor in the circuit into another dc voltage with a fixed voltage or an adjustable voltage; the PFC unit is used for improving the power factor of an alternating current input power supply in the circuit.
With reference to the first aspect, in a ninth possible implementation manner of the second aspect, the main MCU module and the standby MCU module adopt a 38PIN ARM M0 kernel MCU.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the single-wire bidirectional communication circuit provided by the embodiment of the application is used for connecting a main MCU module and a standby MCU module to realize bidirectional communication of the main MCU module and the standby MCU module, and the main MCU module is used for controlling a motor in the circuit; the standby MCU module is used for controlling an alternating current input power supply or a direct current input power supply of the circuit; the circuit comprises a threshold switch module, an isolation module and a clamping module, wherein the threshold switch module is used for receiving a control signal sent by a main MCU module or a standby MCU module, shaping the control signal and outputting a corresponding level signal; the isolation module is used for isolating data sent by the main MCU module and the standby MCU module, and the clamping module is used for limiting the potential of a certain port of the threshold switch module within a preset potential threshold.
When a certain physical distance exists between the main MCU and the standby MCU and the wire arrangement or cable connection is needed for serial port communication, but the IC pin resource of the main MCU or the standby MCU is very nervous, under the condition that the system cost is not increased, the embodiment of the application enables the main MCU and the standby MCU to only need to pass through one serial port communication pin by providing the single-wire bidirectional communication circuit, the bidirectional communication can be realized, the single-wire bidirectional communication circuit is simple in structure and strong in anti-interference capacity, the pin resource of the MCU is effectively saved, and the system cost is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic diagram of a single-wire bidirectional communication circuit according to an embodiment of the present disclosure;
fig. 2 is a simulated waveform diagram of a single-wire bidirectional communication circuit according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
A server that implements various embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description, suffixes such as "module", "part", or "unit" used to indicate elements are used only for the convenience of description of the present invention, and have no specific meaning in itself. Thus, "module" and "component" may be used in a mixture.
This application embodiment is applied to serial ports communication circuit technical field, this application embodiment is used for at MCU pin resource shortage, but need increase serial ports communication of the same kind again, and there is certain physical distance between main MCU and the reserve MCU and needs the application scenario of cable junction, in order to practice thrift MCU pin resource, the system cost is reduced, through single line two-way communication circuit, make main MCU and reserve MCU all can more an IO interface satisfy the communication demand.
As shown in fig. 1, which is a schematic diagram of a single-wire bidirectional communication circuit provided in an embodiment of the present application, and as shown in fig. 2, which is a simulation waveform diagram of a single-wire bidirectional communication circuit provided in an embodiment of the present application, the circuit is used for connecting a main MCU (micro controller Unit) module and a standby MCU module to implement bidirectional communication between the main MCU module and the standby MCU module, and the main MCU module is used for controlling a motor in the circuit; the standby MCU module is used for controlling an alternating current input power supply or a direct current input power supply of the circuit; the circuit comprises a threshold switch module, an isolation module and a clamping module, wherein the threshold switch module is used for receiving a control signal sent by a main MCU module or a standby MCU module, shaping the control signal and outputting a corresponding level signal; the isolation module is used for isolating data sent by the main MCU module and the standby MCU module, so that the anti-interference capability of the single-wire bidirectional communication circuit is enhanced, and the clamping module is used for limiting the potential of a certain port of the threshold switch module within a preset potential threshold.
Optionally, the TX pin of the main MCU module and the RX pin of the standby MCU are dedicated serial communication pins, and the TX pin of the main MCU transmits a frame of data to the RX pin of the standby MCU, and the standby MCU configures the RX pin as a TX function after receiving the data, so that the standby MCU can transmit the data to the main MCU, and meanwhile, the main MCU configures the TX pin as an RX function, which can receive the data transmitted by the standby MCU.
This application embodiment exists certain physical distance and needs winding displacement or cable connection to carry out serial communication between main MCU and reserve MCU, but main MCU or reserve MCU's IC pin resource is very nervous again, this application embodiment is under the condition that does not increase system cost, make main MCU and reserve MCU only need through a serial communication foot through providing a single line two-way communication circuit, just can realize two-way communication, this single line two-way communication circuit simple structure, and the interference killing feature is strong, MCU pin resource has effectively been practiced thrift, thereby system cost is reduced.
In another embodiment of the present application, the threshold switch module employs a 4-bit Schmitt inverter, the 4-bit Schmitt inverter includes a first bit U1-A, a second bit U1-B, a third bit U1-C and a fourth bit U1-D; the isolation module comprises a fourth diode D4 and a first diode D1; the clamping module comprises a second diode D2 and a third diode D3; the circuit further comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;
an input end of the first bit U1-A is connected with a TX pin of the main MCU module, one end of the first resistor R1 and an anode of the first diode D1, and the other end of the first resistor R1 is connected with a supply voltage VCC; the output end of the first bit U1-A is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with the anode of the second diode D2 and the input end of the second bit U1-B, the output end of the second bit U1-B is connected with one end of the fourth resistor R4, the cathode of the third diode D3 and the cathode of the fourth diode D4, and the other end of the fourth resistor R4 is connected with a supply voltage VCC;
the positive electrode of the fourth diode D4 is connected to the RX pin of the standby MCU module, the input end of a third bit U1-C, and one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to a supply voltage VCC; the output end of the third bit U1-C is connected with one end of a fifth resistor R5, the other end of the fifth resistor R5 is connected with the anode of a third diode D3 and the input end of a fourth bit U1-D, the output end of the fourth bit U1-D is connected with one end of a second resistor R2, the cathode of the second diode D2 and the cathode of the first diode D1, and the other end of the second resistor R2 is connected with a power supply voltage VCC.
It should be understood by those skilled in the art that the above examples of the isolation module and the threshold switch module are only used for illustrating the embodiments of the present application, and the embodiments of the present application are not limited thereto.
In another embodiment of the present application, the first diode D1 is used for isolating data transmitted from an RX pin of the standby MCU module to a TX pin of the main MCU module; the fourth diode D4 is used to isolate data transmitted from the TX pin of the main MCU module to the RX pin of the standby MCU module.
In another embodiment of the present application, the third diode D3 is configured to clamp the input terminal of the fourth bit U1-D of the 4-bit schmitt inverter when the TX pin of the main MCU module transmits data to the RX pin of the standby MCU module, and limit the potential of the input terminal of the fourth bit U1-D of the 4-bit schmitt inverter within a preset potential threshold, so that the output terminal of the fourth bit U1-D is at a high level.
In another embodiment of the present application, the second diode D2 is configured to clamp the input terminal of the second bit U1-B of the 4-bit schmitt inverter when the RX pin of the standby MCU module transmits data to the TX pin of the main MCU module, and limit the potential of the input terminal of the second bit U1-B of the 4-bit schmitt inverter within a preset potential threshold, so that the output terminal of the second bit U1-B is at a high level.
Under the condition that the system cost is not increased, a single-wire bidirectional communication circuit is formed by one Schmidt phase inverter, 6 resistors and 4 diodes, so that one pin in serial ports of the main MCU module and the standby MCU module can be used for other control purposes, and the MCU pin resource and the system cost are saved; the communication line passes through the winding displacement and connects between main MCU module and the reserve MCU module, and the single line two-way communication circuit that this application embodiment provided, anti-interference effect is good, and the communication success rate reaches the effect of two-way serial communication.
In another embodiment of the application, the main MCU module and the standby MCU module adopt a 38PIN ARM M0 kernel MCU for controlling a motor in a single-wire bidirectional communication circuit.
Optionally, the standby MCU module is configured to implement a PFC or BOOST function, that is, the standby MCU module may include a PFC unit or a BOOST unit.
In another embodiment of the present application, the backup MCU module includes a PFC unit, and the PFC unit is configured to increase a power factor of an ac power grid input in the circuit.
In another embodiment of the present application, the standby MCU module includes a BOOST unit, and the BOOST unit is configured to convert a dc voltage of a motor in the circuit into another dc voltage with a fixed voltage or an adjustable voltage. The incomplete problem of electric wire netting of mainly used solution partial area, for example, when being applied to the single line two-way communication circuit of this application embodiment and solving the agricultural irrigation problem through photovoltaic water pump system, because the photovoltaic cell board cost is very high, BOOST unit through this application embodiment can realize that voltage steps up and photovoltaic water pump inverter drive water pump, reduces photovoltaic cell board's use quantity to effectively reduce photovoltaic water pump system's cost.
It should be understood by those skilled in the art that the above example of the BOOST unit of the standby MCU module is only used to illustrate the embodiment of the present application, and the embodiment of the present application does not limit this, and other units may also be used to implement the voltage boosting function.
In another embodiment of the application, the main MCU module includes a frequency conversion unit, and the frequency conversion unit is used for adjusting the power supply operating frequency of the motor in the circuit, and is mainly used for realizing long-term stable operation of the motor, so as to solve the problem of motor burning caused by low voltage of the power grid when the motor is directly driven by the power grid in some areas, and further improve the safety of the circuit and save the cost in this aspect.
It should be known to those skilled in the art that the foregoing examples of the frequency conversion unit of the main MCU module are only used for illustrating the embodiments of the present application, and the embodiments of the present application are not limited thereto, and other units may also be used to implement the function of long-term stable operation of the motor.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A single-wire bidirectional communication circuit is characterized in that the circuit is used for connecting a main MCU module and a standby MCU module to realize bidirectional communication of the main MCU module and the standby MCU module, and the main MCU module is used for controlling a motor in the circuit; the standby MCU module is used for controlling an alternating current input power supply or a direct current input power supply of the circuit; the circuit comprises a threshold switch module, an isolation module and a clamping module, wherein the threshold switch module is used for receiving a control signal sent by a main MCU module or a standby MCU module, shaping the control signal and outputting a corresponding level signal; the isolation module is used for isolating data sent by the main MCU module and the standby MCU module, and the clamping module is used for limiting the potential of a certain port of the threshold switch module within a preset potential threshold.
2. The circuit of claim 1, wherein the threshold switching module employs a 4-bit schmitt inverter.
3. The circuit of claim 2, wherein the 4-bit schmitt inverter includes a first bit U1-a, a second bit U1-B, a third bit U1-C, and a fourth bit U1-D; the isolation module comprises a fourth diode D4 and a first diode D1; the clamping module comprises a second diode D2 and a third diode D3; the circuit further comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6;
an input end of the first bit U1-A is connected with a TX pin of the main MCU module, one end of the first resistor R1 and an anode of the first diode D1, and the other end of the first resistor R1 is connected with a supply voltage VCC;
the output end of the first bit U1-A is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with the anode of the second diode D2 and the input end of the second bit U1-B, the output end of the second bit U1-B is connected with one end of the fourth resistor R4, the cathode of the third diode D3 and the cathode of the fourth diode D4, and the other end of the fourth resistor R4 is connected with a supply voltage VCC;
the positive electrode of the fourth diode D4 is connected to the RX pin of the standby MCU module, the input end of a third bit U1-C, and one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to a supply voltage VCC;
the output end of the third bit U1-C is connected with one end of a fifth resistor R5, the other end of the fifth resistor R5 is connected with the anode of a third diode D3 and the input end of a fourth bit U1-D, the output end of the fourth bit U1-D is connected with one end of a second resistor R2, the cathode of the second diode D2 and the cathode of the first diode D1, and the other end of the second resistor R2 is connected with a power supply voltage VCC.
4. The circuit of claim 3, wherein the first diode D1 is used to isolate data transmitted from the RX pin of the standby MCU module to the TX pin of the main MCU module.
5. The circuit of claim 3, wherein the fourth diode D4 is used for isolating data transmitted from the TX pin of the main MCU module to the RX pin of the standby MCU module.
6. The circuit of claim 3, wherein the third diode D3 is configured to limit the potential at the input of the fourth bit U1-D of the 4-bit Schmitt inverter to within a preset potential threshold when the TX pin of the main MCU module transmits data to the RX pin of the standby MCU module, such that the output of the fourth bit U1-D is high.
7. The circuit of claim 3, wherein the second diode D2 is configured to limit the voltage at the input of the second bit U1-B of the 4-bit Schmitt inverter to within a predetermined voltage threshold value and to bring the output of the second bit U1-B to a high level when the RX pin of the standby MCU module is transmitting data to the TX pin of the main MCU module.
8. The circuit of claim 1, wherein the master MCU module comprises a frequency conversion unit configured to adjust a power supply operating frequency of a motor in the circuit.
9. The circuit of claim 1, wherein the standby MCU module comprises a BOOST unit or a PFC unit, and the BOOST unit is configured to convert a dc voltage of a motor in the circuit into another dc voltage of a fixed voltage or an adjustable voltage; the PFC unit is used for improving the power factor of an alternating current input power supply in the circuit.
10. The circuit of any one of claims 1-9, wherein the master MCU module and the standby MCU module employ a 38PIN ARM M0 kernel MCU.
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| CN201922287586.5U CN210899200U (en) | 2019-12-18 | 2019-12-18 | Single-wire bidirectional communication circuit |
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| CN201922287586.5U CN210899200U (en) | 2019-12-18 | 2019-12-18 | Single-wire bidirectional communication circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112052207A (en) * | 2020-09-29 | 2020-12-08 | 深圳市海和科技股份有限公司 | Single-wire two-way communication system between double MCUs |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112052207A (en) * | 2020-09-29 | 2020-12-08 | 深圳市海和科技股份有限公司 | Single-wire two-way communication system between double MCUs |
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