Communication device based on power line and intelligent automobile digital sensor

Abstract

The utility model discloses a communication device based on a power line and an intelligent automobile digital sensor, and belongs to the technical field of intelligent automobiles. The constant current source circuit is connected with the code sending circuit and is used for supplying power to the code sending circuit when the code sending circuit works; and the signal analysis module is connected with the signal sending module and is used for collecting the data signal sent by the code sending circuit through a power line and analyzing the data signal. Through the device, when the signal analysis module analyzes the data signal sent by the signal sending module, the signal analysis module is not restricted by the voltage change of the power supply end of the signal sending module and the load change; therefore, the signal analysis module can accurately analyze the data signal sent by the signal sending module.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent vehicles, and in particular to a communication device based on a power line and a digital sensor for an intelligent vehicle. Background Art

[0002] In smart cars, for some signal transmission modules with single functions and data that only need one-way transmission, a communication method using power lines as carriers has emerged. In this communication method, the coding circuit in the signal transmission module can change the load current of the signal transmission module by turning on and off the internal resistance load, which will cause the voltage drop of the voltage-dividing resistor at the power supply end of the signal transmission module to change. At this time, the signal analysis module can determine the data signal sent by the coding circuit in the signal transmission module by monitoring the voltage drop change on the voltage-dividing resistor at the power supply end.

[0003] However, since the working current of the signal transmission module itself is uncertain, it may be too large or too small depending on the change of its internal load, and the signal analysis module mainly relies on monitoring the voltage drop change of the voltage-dividing resistor at the power supply end of the signal transmission module to analyze the data signal sent by the coding circuit in the signal transmission module. Obviously, once the load of the signal transmission module changes or the power supply voltage at its power supply end changes, the coding circuit in the signal transmission module cannot send a stable data signal, which in turn causes the signal analysis module to be unable to accurately analyze the data signal sent by the signal transmission module. At present, there is no more effective solution to this technical problem.

[0004] It can be seen that when the signal sending module communicates with the signal analyzing module through the power line, how to enable the signal analyzing module to accurately analyze the data signal sent by the signal sending module is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a communication device based on a power line and a smart car digital sensor to solve the technical problem in the prior art that when the signal sending module communicates with the signal analyzing module through the power line, the signal analyzing module cannot accurately analyze the data signal sent by the signal sending module. The specific scheme is as follows:

[0006] In order to solve the above technical problems, the utility model provides a communication device based on a power line, comprising:

[0007] A signal sending module provided with a coding circuit;

[0008] A constant current source circuit connected to the code sending circuit and used to supply power to the code sending circuit when the code sending circuit is working;

[0009] A signal analysis module connected to the signal sending module is used to collect the data signal sent by the coding circuit through a power line and analyze the data signal.

[0010] Preferably, the signal sending module comprises: a load resistor, a first transistor and the coding circuit;

[0011] Wherein, the second end of the load resistor is connected to the collector of the first transistor, and the emitter of the first transistor is grounded;

[0012] Correspondingly, the base of the first transistor is used to receive the target signal sent by the coding circuit, the first end of the constant current source circuit is connected to the first end of the load resistor, and the second end of the constant current source circuit is grounded.

[0013] Preferably, it also includes: a sampling resistor;

[0014] Wherein, a first end of the sampling resistor is connected to a VCC power supply, and a second end of the sampling resistor is connected to a first end of the load resistor.

[0015] Preferably, the signal analysis module comprises: a first resistor, a second resistor, a third resistor, a fourth resistor, a signal comparison unit and a first controller;

[0016] Among them, the first end of the first resistor is connected to the first end of the load resistor, the second end of the first resistor is respectively connected to the first input end of the signal comparison unit and the first end of the second resistor, the second end of the second resistor is grounded, the first end of the third resistor is connected to the VCC power supply, the second end of the third resistor is respectively connected to the first end of the first controller and the first end of the fourth resistor, the second end of the fourth resistor is grounded, the second input end of the signal comparison unit is connected to the second end of the first controller, and the output end of the signal comparison unit is connected to the third end of the first controller.

[0017] Preferably, the signal comparison unit is specifically a comparator;

[0018] The positive input terminal of the comparator is the first input terminal of the signal comparison unit, and the negative input terminal of the comparator is the second input terminal of the signal comparison unit.

[0019] Preferably, the signal analysis module comprises: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a second controller;

[0020] Among them, the first end of the fifth resistor is connected to the first end of the load resistor, the second end of the fifth resistor is respectively connected to the first end of the sixth resistor and the second end of the second controller, the second end of the sixth resistor is grounded, the first end of the seventh resistor is connected to the VCC power supply, the second end of the seventh resistor is respectively connected to the first end of the second controller and the first end of the eighth resistor, and the second end of the eighth resistor is grounded.

[0021] Preferably, the constant current source circuit comprises: a ninth resistor, a tenth resistor, a second transistor and a third transistor;

[0022] Wherein, the first end of the ninth resistor is connected to the first end of the load circuit, the second end of the ninth resistor is respectively connected to the base of the second triode and the collector of the third triode, the collector of the second triode is connected to the second end of the load circuit, the emitter of the second triode is respectively connected to the base of the third triode and the first end of the tenth resistor, the second end of the tenth resistor is grounded, and the emitter of the third triode is grounded;

[0023] Correspondingly, the third end of the load circuit is connected to the second end of the sampling resistor.

[0024] Preferably, it further comprises: a fourth triode;

[0025] The base of the fourth transistor is connected to the fourth end of the load circuit, the collector of the fourth transistor is connected to the fifth end of the load circuit, and the emitter of the fourth transistor is grounded.

[0026] Preferably, the signal sending module is specifically a sensor based on digital serial communication.

[0027] In order to solve the above technical problems, the utility model also provides a smart car digital sensor, including a power line-based communication device as disclosed above.

[0028] It can be seen that in the communication device based on the power line provided by the utility model, it includes: a signal sending module provided with a coding circuit; a constant current source circuit connected to the coding circuit, used to power the coding circuit when the coding circuit is working; and a signal analysis module connected to the signal sending module, used to collect the data signal sent by the coding circuit through the power line and analyze the data signal. Compared with the prior art, in the communication device, because the coding circuit in the signal sending module is powered by the constant current source circuit when working, the signal sending module can send a stable data signal through the constant current source circuit, so that when the signal analysis module analyzes the data signal sent by the signal sending module, it will no longer be restricted by the voltage change of the power supply end of the signal sending module and the load change, so that the signal analysis module can accurately analyze the data signal sent by the signal sending module. Correspondingly, the intelligent automobile digital sensor provided by the utility model also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 A structural diagram of a power line-based communication device provided by an embodiment of the utility model;

[0031] Figure 2 It is a schematic diagram of the principle of the signal sending module and the signal analyzing module when performing signal transmission;

[0032] Figure 3 A structural diagram of another power line-based communication device provided by an embodiment of the utility model;

[0033] Figure 4 A structural diagram of another power line-based communication device provided by an embodiment of the utility model;

[0034] Figure 5 A structural diagram of a constant current source circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] See also Figure 1 , Figure 1 A structural diagram of a power line-based communication device provided by an embodiment of the utility model, the device comprising:

[0037] A signal sending module 11 provided with a code sending circuit 10;

[0038] A constant current source circuit 12 connected to the code sending circuit 10 and used to supply power to the code sending circuit 10 when the code sending circuit 10 is working;

[0039] The signal analysis module 13 is connected to the signal sending module 11 and is used to collect the data signal sent by the coding circuit 10 through the power line and analyze the data signal.

[0040] In this embodiment, a communication device based on a power line is provided, in which, when the signal sending module 11 communicates with the signal analyzing module 13 through the power line, the signal analyzing module 13 can accurately analyze the data signal sent by the signal sending module 11. In other words, in the communication device, when the signal sending module 11 sends a data signal to the signal analyzing module 13, only the most basic power line is needed, and no additional data transmission line is needed to send the data signal, and the communication device can also enable the signal analyzing module 13 to accurately analyze the data signal sent by the signal sending module 11.

[0041] See also Figure 2 , Figure 2 The schematic diagram is a schematic diagram of the principle of the signal transmission module and the signal analysis module when performing signal transmission. Figure 2 In the figure, 10 represents a coding circuit, 11 represents a signal sending module, 12 represents a constant current source circuit, 101 represents a DCDC power supply, 102 represents a microcontroller in the signal sending module 11, 103 represents a switching switch, Rs represents a load resistor, R0 represents a sampling resistor, Uin represents a supply voltage of a VCC power supply, 13 represents a signal analysis module, 301 represents a microcontroller in the signal analysis module 13, 302 represents a decoding circuit, 303 represents an AD sampling circuit, and 304 represents a DAC (Digital to Analog Convertor) circuit.

[0042] exist Figure 2 In the signal sending module 11 shown, a constant current source circuit 12 is additionally added on the basis of the original signal sending module. In practical applications, when the microcontroller 102 in the signal sending module 11 detects that the code sending circuit 10 is in a dormant state, the microcontroller 102 will turn on the DCDC power supply 101 through the switch 103, and use the DCDC power supply 101 to power other functional modules in the signal sending module 11, so that the power consumption required by the signal sending module 11 during operation can be reduced.

[0043] When the microcontroller 102 in the signal transmission module 11 detects that the code transmission circuit 10 is in working state, the microcontroller 102 will turn on the constant current source circuit 12 through the switching switch 103, and use the constant current source circuit 12 to power the code transmission circuit 10. It can be imagined that when the constant current source circuit 12 is used to power the code transmission circuit 10, the code transmission circuit 10 can send a stable data signal. In this case, the microcontroller 301 in the signal analysis module 13 monitors the current change on the power line through the AD sampling circuit 303, and the microcontroller 301 in the signal analysis module 13 can analyze the data signal sent by the code transmission circuit 10 by controlling the decoding circuit 302, and output the analyzed data signal through the DAC circuit 304.

[0044] It can be imagined that under this setting, when the signal analysis module 13 analyzes the data signal sent by the signal sending module 11, it will no longer be restricted by the voltage changes at the power supply end of the signal sending module 11 and the load changes. Therefore, the signal analysis module 13 can accurately analyze the data signal sent by the signal sending module 11.

[0045] It can be seen that in the power line-based communication device provided in this embodiment, it includes: a signal sending module provided with a coding circuit; a constant current source circuit connected to the coding circuit for supplying power to the coding circuit when the coding circuit is working; and a signal analysis module connected to the signal sending module for collecting the data signal sent by the coding circuit through the power line and analyzing the data signal. Compared with the prior art, in the communication device, because the coding circuit in the signal sending module is powered by the constant current source circuit when working, the signal sending module can send a stable data signal through the constant current source circuit, so that when the signal analysis module analyzes the data signal sent by the signal sending module, it will no longer be restricted by the voltage change of the power supply terminal of the signal sending module and the load change, so that the signal analysis module can accurately analyze the data signal sent by the signal sending module.

[0046] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Figure 3 , Figure 3 This is a structural diagram of another power line-based communication device provided by an embodiment of the utility model. As a preferred implementation, the signal sending module 11 includes: a load resistor Rs, a first transistor K1 and a code sending circuit 10;

[0047] Wherein, the second end of the load resistor Rs is connected to the collector of the first transistor K1, and the emitter of the first transistor K1 is grounded;

[0048] Correspondingly, the base of the first transistor K1 is used to receive the target signal sent by the coding circuit 10, the first end of the constant current source circuit 12 is connected to the first end of the load resistor Rs, and the second end of the constant current source circuit 12 is grounded.

[0049] In this embodiment, the signal sending module 11 is specifically described. Figure 3 In FIG. 1 , I0 represents the constant current source circuit 12. When the coding circuit is in working state, the first transistor K1 is turned on, and the constant current source circuit I0 supplies power to the coding circuit 10. At this time, the coding circuit 10 can send a stable data signal. It should be noted that since the coding circuit 10 is a well-known circuit to those skilled in the art, Figure 3 It is just to facilitate the readers to understand the technical solution provided in this application. Figure 3 The specific circuit structure of the code generating circuit 10 is not shown in the figure, and is hereby explained.

[0050] In order to enable the signal analysis module 13 to collect the load current change of the signal sending module 11 through the power line, a sampling resistor R0 is also provided in the communication device. The first end of the sampling resistor R0 is connected to the VCC power supply, and the second end of the sampling resistor R0 is connected to the first end of the load resistor Rs. The supply voltage Uin of the VCC power supply has a value range of 9V to 16V.

[0051] As a preferred implementation, the signal analysis module 13 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a signal comparison unit M and a first controller 311;

[0052] Among them, the first end of the first resistor R1 is connected to the first end of the load resistor Rs, the second end of the first resistor R1 is respectively connected to the first input end of the signal comparison unit M and the first end of the second resistor R2, the second end of the second resistor R2 is grounded, the first end of the third resistor R3 is connected to the VCC power supply, the second end of the third resistor R3 is respectively connected to the first end of the first controller 311 and the first end of the fourth resistor R4, the second end of the fourth resistor R4 is grounded, the second input end of the signal comparison unit M is connected to the second end of the first controller 311, and the output end of the signal comparison unit M is connected to the third end of the first controller 311.

[0053] exist Figure 3 When the signal sending module 11 communicates with the signal analyzing module 13, there is no need to add any communication lines between the signal sending module 11 and the signal analyzing module 13. The signal analyzing module 13 only needs to monitor the voltage drop of the signal sending module 11 through the power line to determine the data signal sent by the coding circuit 10 in the signal sending module 11.

[0054] Specifically, the microcontroller 102 in the signal sending module 11 can realize the connection and connection of the load resistor Rs by controlling the conduction and cutoff of the first transistor K1. The voltage divider resistor in the signal analysis module 13 has a much higher resistance than the sampling resistor R0, and the current flowing through it can be ignored. Then according to the KCL law, it can be concluded that when the load resistor Rs is connected to Uin, the current passing through the sampling resistor R0 is I0+(U1 / R1). When the load resistor Rs is connected to Uin, the current passing through the sampling resistor R0 is I0. According to Ohm's law, when the load resistor Rs is connected to Uin and connected to Uin, the voltages borne on the sampling resistor R0 are: R0*(I0+(U1 / R1)) and R0*I0 respectively. Among them, U1 is the voltage across the load resistor Rs, and I1 is the current of the load resistor Rs.

[0055] It can be deduced that when the load resistor Rs is connected to Uin, the distribution relationship of the power supply voltage Uin output by the VCC power supply is as follows:

[0056] Uin=(I1+I0)*R0+U1;

[0057] U1=Uin-(I1+I0)*R0;

[0058] When the load resistance R S When Uin is connected, the voltage across Rs is U1=Uin-(U1 / Rs+I0)*R0. After conversion, it is obtained that: U1=(Uin-I0*R0)*(Rs / (R0+Rs));

[0059] When the load resistor Rs is connected to Uin, the voltage across Rs is U1=Uin-I0*R0;

[0060] Reference voltage U ref The average value of the load resistance Rs connected to Uin and connected to Uin can be taken, that is: U ref ={(Uin-I0*R0)*(Rs / (R0+Rs))+(Uin-I0*R0)} / 2;

[0061] Here, R0=100Ω, Rs=300Ω, I0=10mA. When the load resistor Rs is connected to Uin, the voltage across Rs is U H When the load resistor Rs is connected to Uin, the voltage across Rs is U L , substituting into the above formula we can get:

[0062] U H =Uin-1;

[0063] U L =0.75*(Uin-1);

[0064] U H -U L =0.25*(Uin-1);

[0065] U ref =0.875*(Uin-1);

[0066] Please refer to Table 1, which shows the VCC power supply voltage Uin when it is 9~16V. H , U L and U ref The corresponding value. Among them, Uin, U H , U L and U ref The unit is V.

[0067] Table 1

[0068] Serial number <![CDATA[U in ]]> <![CDATA[U H ]]> <![CDATA[U L ]]> <![CDATA[U ref ]]> 1 9 8 6 7 2 10 9 6.75 7.875 3 11 10 7.5 8.75 4 12 11 8.25 9.625 5 13 12 9 10.5 6 14 13 9.75 11.375 7 15 14 10.5 12.25 8 16 15 11.25 13.125

[0069] From the data in Table 1, we can see that when the supply voltage Uin of the VCC power supply is 9-16V, U H and U L The minimum voltage difference between them is about 2V. It can be imagined that the voltage value of 2V is sufficient for the signal analysis module 13 to identify two different level states. ref, it can be ensured that the signal analysis module 13 will no longer be restricted by the supply voltage Uin of the VCC power supply and the load change in the signal sending module 11 when analyzing the data signal sent by the coding circuit 10 in the signal sending module 11.

[0070] When the signal analysis module 13 acquires the supply voltage Uin of the VCC power supply through the first controller 311, the load voltage change of the signal sending module 11 and the reference voltage Uin can be calculated by substituting them into the above formula. ref At this time, the first controller 311 calculates the reference voltage U ref The analog data is sent to the second input terminal of the signal comparison unit M, and then compared with the sampled voltage collected by the first input terminal of the signal comparison unit M, so that the analog changed data can be converted into a digital signal and output to the first controller 311. The first controller 311 can use the serial port protocol or the input capture function of the IO port in conjunction with the internal timer to use Manchester code to parse the data signal sent by the code sending circuit 10 in the signal sending module 11.

[0071] As a preferred implementation, the signal comparison unit M is specifically a comparator;

[0072] The positive input terminal of the comparator is the first input terminal of the signal comparison unit M, and the negative input terminal of the comparator is the second input terminal of the signal comparison unit M.

[0073] Specifically, in this embodiment, the signal comparison unit M is set as a comparator, because the comparator has the advantages of simple structure, low cost and small size, so when the signal comparison unit M is set as a comparator, it can not only reduce the design cost required by the signal analysis module 13, but also reduce the space occupied by the signal analysis module 13. Of course, in practical applications, the signal comparison unit M can also be set as an operational amplifier or a differential comparison circuit, etc.

[0074] See also Figure 4 , Figure 4 This is a structural diagram of another power line-based communication device provided by an embodiment of the utility model. As a preferred implementation, the signal analysis module 13 includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a second controller 312;

[0075] Among them, the first end of the fifth resistor R5 is connected to the first end of the load resistor Rs, the second end of the fifth resistor R5 is respectively connected to the first end of the sixth resistor R6 and the second end of the second controller 312, the second end of the sixth resistor R6 is grounded, the first end of the seventh resistor R7 is connected to the VCC power supply, the second end of the seventh resistor R7 is respectively connected to the first end of the second controller 312 and the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is grounded.

[0076] In practical applications, the signal analysis module 13 can also analyze the data signal sent by the code sending circuit 10 in the signal sending module 11 through a software method. Specifically, the second controller 312 in the signal analysis module 13 obtains the supply voltage Uin of the VCC power supply through sampling of the ADC port at the first end, and substitutes it into the above formula to calculate the load voltage change of the signal sending module 11 and the reference voltage Uin. ref At the same time, the second controller 312 collects the actual voltage change of the load resistor Rs through the ADC port at its second end. At this time, the second controller 312 can determine whether the data signal sent by the code sending circuit 10 is a high level or a low level through the value set inside it, thereby achieving the purpose of parsing the data signal sent by the code sending circuit 10 in the signal sending module 11.

[0077] Obviously, through the technical solution provided in this embodiment, the diversity and flexibility of the signal analysis module when analyzing the data signal sent by the coding circuit in the signal sending module can be guaranteed.

[0078] Based on the above embodiments, this embodiment further explains and optimizes the technical solution. Figure 5 , Figure 5 A structural diagram of a constant current source circuit provided by an embodiment of the utility model. As a preferred embodiment, the constant current source circuit 12 includes: a ninth resistor R9, a tenth resistor R10, a second transistor K2 and a third transistor K3;

[0079] Wherein, a first end of the ninth resistor R9 is connected to a first end of the load circuit 14, a second end of the ninth resistor R9 is respectively connected to a base of the second triode K2 and a collector of the third triode K3, the collector of the second triode K2 is connected to a second end of the load circuit 14, an emitter of the second triode K2 is respectively connected to a base of the third triode K3 and a first end of the tenth resistor R10, a second end of the tenth resistor R10 is grounded, and an emitter of the third triode K3 is grounded;

[0080] Correspondingly, the third terminal of the load circuit 14 is connected to the second terminal of the sampling resistor R0 .

[0081] In this embodiment, a specific configuration structure of a constant current source circuit is provided. When the code sending circuit 10 in the signal sending module 11 is in working state, Uin passes through the sampling resistor R0, the load circuit 14, the second triode K2, the third triode K3, the ninth resistor R9 and the tenth resistor R10, and forms a power supply loop with the ground.

[0082] According to the principle of transistors, Ie=Ic+Ib, if the base current Ib is negligible, then Ie=Ic. If the current Ic increases, the voltage across the tenth resistor R10 will increase, and the base voltage Ub of the second transistor K2 will decrease, which will cause Ib to decrease. According to the principle of Ic=Ib*β, Ic will also decrease. Conversely, if the current Ic decreases, the voltage across the tenth resistor R10 will decrease, which will cause Ib to increase, and Ic will also increase, thus achieving closed-loop regulation of the current.

[0083] As the VCC power supply voltage Uin continues to change, the voltage across the tenth resistor R10 increases, and when the third transistor K3 is turned on, the voltage across the tenth resistor R10 will be clamped at about 0.7V. At this time, the current Ie=0.7 / R10 can be guaranteed. Then, the output of constant current can be achieved by adjusting the resistance value of the tenth resistor R10.

[0084] As a preferred implementation, it further includes: a fourth transistor K4;

[0085] The base of the fourth triode K4 is connected to the fourth end of the load circuit 14 , the collector of the fourth triode K4 is connected to the fifth end of the load circuit 14 , and the emitter of the fourth triode K4 is grounded.

[0086] When the code sending circuit 10 in the signal sending module 11 is in a dormant state, Figure 5 The constant current source circuit shown is turned off, and the fourth transistor K4 is turned on. At this time, Uin passes through the sampling resistor R0, the load circuit 14, the fourth transistor K4, and the ground to form a power supply loop. At this time, the current flowing through the load circuit 14 depends on the consumption of the load itself, so that low power consumption of the circuit can be achieved.

[0087] Obviously, the constant current source circuit provided in this embodiment can provide a constant current source for the code sending circuit in the signal sending module.

[0088] Based on the above embodiments, this embodiment further illustrates and optimizes the technical solution. As a preferred implementation, the signal sending module 11 is specifically a sensor based on digital serial communication.

[0089] It can be imagined that in practical applications, most of the digital serial communication sensors on smart cars currently use LIN (Local Interconnect Network) communication to transmit data, such as: handlebars and steering wheels on smart cars, etc., and LIN is a unidirectional transmission signal line, which uses UART (Universal Asynchronous Receiver / Transmitter) serial communication protocol for data transmission. Therefore, sensors using LIN communication usually have the characteristics of small data transmission volume and relatively single function.

[0090] Based on this property of the LIN communication sensor, in practical applications, the signal sending module 11 can be replaced with a sensor based on digital serial communication. Obviously, when the signal sending module 11 is replaced with a sensor based on digital serial communication, the signal parsing module 13 can accurately parse the data signal sent by the sensor based on digital serial communication, thereby further ensuring the stability and reliability of the smart car during operation.

[0091] In addition, in practical applications, the power supply voltage of many smart car power supply terminals requires a wide voltage input of 9 to 16 V, and in the communication device provided in this application, the value range of the VCC power supply voltage is also 9 to 16 V. Therefore, the power line-based communication device provided in this application can also be compatible with related product components in smart cars.

[0092] Obviously, the technical solution provided by this embodiment can improve the universality of this application in practical applications.

[0093] Correspondingly, an embodiment of the utility model further provides a smart car digital sensor, including a power line-based communication device as disclosed above.

[0094] An intelligent automobile digital sensor provided by an embodiment of the utility model has the beneficial effects of the aforementioned power line-based communication device.

[0095] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A communication device based on a power line, characterized in that: include: A signal sending module provided with a coding circuit; A constant current source circuit connected to the code sending circuit and used to supply power to the code sending circuit when the code sending circuit is working; A signal analysis module connected to the signal sending module is used to collect the data signal sent by the coding circuit through a power line and analyze the data signal.

2. A power line based communication device according to claim 1, characterized in that: The signal sending module includes: a load resistor, a first transistor and the code sending circuit; Wherein, the second end of the load resistor is connected to the collector of the first transistor, and the emitter of the first transistor is grounded; Correspondingly, the base of the first transistor is used to receive the target signal sent by the coding circuit, the first end of the constant current source circuit is connected to the first end of the load resistor, and the second end of the constant current source circuit is grounded.

3. A power line based communication device according to claim 2, characterized in that: Also includes: Sampling resistor; Wherein, a first end of the sampling resistor is connected to a VCC power supply, and a second end of the sampling resistor is connected to a first end of the load resistor.

4. A power line based communication device according to claim 3, characterized in that: The signal analysis module includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a signal comparison unit and a first controller; Among them, the first end of the first resistor is connected to the first end of the load resistor, the second end of the first resistor is respectively connected to the first input end of the signal comparison unit and the first end of the second resistor, the second end of the second resistor is grounded, the first end of the third resistor is connected to the VCC power supply, the second end of the third resistor is respectively connected to the first end of the first controller and the first end of the fourth resistor, the second end of the fourth resistor is grounded, the second input end of the signal comparison unit is connected to the second end of the first controller, and the output end of the signal comparison unit is connected to the third end of the first controller.

5. A power line based communication device according to claim 4, characterized in that: The signal comparison unit is specifically a comparator; The positive input terminal of the comparator is the first input terminal of the signal comparison unit, and the negative input terminal of the comparator is the second input terminal of the signal comparison unit.

6. A power line based communication device according to claim 3, characterized in that: The signal analysis module includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a second controller; Among them, the first end of the fifth resistor is connected to the first end of the load resistor, the second end of the fifth resistor is respectively connected to the first end of the sixth resistor and the second end of the second controller, the second end of the sixth resistor is grounded, the first end of the seventh resistor is connected to the VCC power supply, the second end of the seventh resistor is respectively connected to the first end of the second controller and the first end of the eighth resistor, and the second end of the eighth resistor is grounded.

7. A power line based communication device according to claim 3, characterized in that: The constant current source circuit comprises: a ninth resistor, a tenth resistor, a second triode and a third triode; Wherein, the first end of the ninth resistor is connected to the first end of the load circuit, the second end of the ninth resistor is respectively connected to the base of the second triode and the collector of the third triode, the collector of the second triode is connected to the second end of the load circuit, the emitter of the second triode is respectively connected to the base of the third triode and the first end of the tenth resistor, the second end of the tenth resistor is grounded, and the emitter of the third triode is grounded; Correspondingly, the third end of the load circuit is connected to the second end of the sampling resistor.

8. A power line based communication device according to claim 7, characterized in that: Also includes: The fourth transistor; The base of the fourth transistor is connected to the fourth end of the load circuit, the collector of the fourth transistor is connected to the fifth end of the load circuit, and the emitter of the fourth transistor is grounded.

9. A power line based communication device according to any one of claims 1 to 8, characterized in that: The signal sending module is specifically a sensor based on digital serial communication.

10. A smart car digital sensor, characterized in that: It comprises a power line based communication device as claimed in any one of claims 1 to 9.

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