Communication circuit and communication chip

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By designing a communication circuit including switch modules and OC modules, the problem of high cost of LIN chips in vehicle communication is solved, and communication between the on-board slave equipment and the vehicle is realized, reducing costs and avoiding erroneous frame transmission.

CN222321686UActive Publication Date: 2025-01-07SHENZHEN LONGTECH SMART CONTROL CO LTD

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Patent Information

Application Number: CN202323486369.1
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2023-12-20
Publication Date: 2025-01-07
Estimated Expiration: 2033-12-20

AI Technical Summary

Technical Problem

The use of LIN chips in vehicle communication in the prior art leads to excessive cost problems.

Method used

A communication circuit is designed, including a first branch and a second branch provided with a switch module and an OC module. Through the first branch, the vehicle signal is transmitted to the slave, and the switch module is carried out according to the signal received by the slave. When on or off, the OC module pulls down the voltage at the vehicle signal end when on to avoid erroneous frame transmission, thus eliminating the need to use a LIN chip.

Benefits of technology

The communication between the slave equipment on the vehicle and the entire vehicle is realized, reducing costs and avoiding error frame transmission. Communication is completed by only the switch module and the OC module.

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Abstract

The utility model discloses a communication circuit and a communication chip, the communication circuit is respectively connected with a slave machine and a whole vehicle signal end, and the communication circuit comprises a first branch circuit and a second branch circuit provided with a switch module and an OC module; the first branch is respectively connected with a whole vehicle signal end and a receiving end of the slave, the switch module is respectively connected with a sending end of the slave, and the OC module is respectively connected with the switch module and the whole vehicle signal end. According to the utility model, the signal transmission of the whole vehicle to the slave is realized through the first branch, the switch module is switched on and switched off according to the signal of the whole vehicle, and the OC module pulls down the voltage or does not output the signal according to the switch-on condition of the switch module, so that error frame transmission in communication is avoided, an LIN chip does not need to be used, and the cost is reduced. And communication between the on-vehicle slave equipment and the whole vehicle can be realized only through the switch module and the OC module, so that the cost is further reduced.

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Description

Technical Field

[0001] The utility model relates to the technical field of communication, in particular to a communication circuit and a communication chip. Background Art

[0002] The communication between the cooling / lubricating water pump / oil pump and the whole vehicle is mainly divided into three types: PWM, LIN and CAN. LIN belongs to the single-line communication mode, and the communication frequency is within 20KHZ. The LIN communication function on the market is completed by LIN chip, but LIN chip will increase the cost of the whole product.

[0003] Therefore, the prior art still needs to be improved and developed. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a communication and a communication chip to solve the problem of high cost of using LIN chips in vehicle communication in the prior art.

[0005] The technical solution of the utility model is as follows:

[0006] A communication circuit is connected to the slave and the vehicle signal terminal respectively, comprising: a first branch and a second branch provided with a switch module and an OC module;

[0007] The first branch is connected to the vehicle signal terminal and the receiving terminal of the slave device respectively, and is used to transmit the vehicle signal to the slave device;

[0008] The switch modules are respectively connected to the transmitting ends of the slaves, and are used to switch off or on according to the vehicle signal received by the slaves;

[0009] The OC module is connected to the switch module and the vehicle signal end respectively, and is used to lower the voltage of the vehicle signal end when it is turned on, and not output a signal to the vehicle signal end when it is turned off.

[0010] A further configuration of the utility model further includes a first protection unit;

[0011] The first protection unit is connected to the sending end of the slave and the switch module respectively, and is used to perform overcurrent protection on the sending end of the slave.

[0012] In a further configuration of the utility model, the switch module includes a first resistor and a first transistor;

[0013] One end of the first resistor is connected to a first power supply voltage, and the other end of the first resistor is connected to the first protection unit;

[0014] The base of the first transistor is connected to the first protection unit, the emitter of the first transistor is connected to a first power supply voltage, and the collector of the first transistor is connected to the OC module.

[0015] In a further configuration of the utility model, the OC module includes a second resistor, a third resistor and a second triode;

[0016] One end of the second resistor is connected to the switch module, the other end of the second resistor is connected to one end of the third resistor, and the other end of the third resistor is grounded;

[0017] The base of the second transistor is connected to one end of the third resistor, the emitter of the second transistor is grounded, and the collector of the second transistor is connected to the vehicle signal terminal.

[0018] In a further configuration of the present utility model, the first branch includes a voltage dividing unit;

[0019] The voltage dividing unit is connected to the vehicle signal terminal and is used for voltage dividing the vehicle signal.

[0020] In a further configuration of the present utility model, the first branch includes a filtering unit;

[0021] The filtering unit is connected to the voltage dividing unit and is used for filtering the whole vehicle signal.

[0022] In a further configuration of the present utility model, the first branch includes a second protection unit;

[0023] The second protection unit is connected to the first power supply voltage and the receiving end of the slave device respectively, and is used for performing voltage stabilization protection on the receiving end of the slave device.

[0024] In a further configuration of the utility model, the voltage dividing unit includes a fourth resistor, a fifth resistor and a sixth resistor;

[0025] One end of the fourth resistor is connected to the second power supply voltage, and the other end of the fourth resistor is connected to the vehicle signal terminal;

[0026] One end of the fifth resistor is connected to the filtering unit, the other end of the fifth resistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded.

[0027] In a further configuration of the utility model, the second protection unit includes a bipolar diode and a voltage regulator tube;

[0028] The anode of the bipolar diode is grounded, the cathode of the bipolar diode is connected to the first power supply voltage, and the common end of the bipolar diode is connected to the receiving end of the slave;

[0029] The cathode of the voltage regulator tube is connected to the receiving end of the slave, and the anode of the voltage regulator tube is grounded.

[0030] The utility model also provides a communication chip, comprising the communication circuit as described above.

[0031] The utility model provides a communication circuit and a communication chip, wherein the communication circuit is connected to a slave and a vehicle signal end respectively, and comprises: a first branch and a second branch provided with a switch module and an OC module; the first branch is connected to the vehicle signal end and the receiving end of the slave respectively, and is used to transmit the vehicle signal to the slave; the switch module is connected to the sending end of the slave respectively, and is used to turn off or turn on according to the vehicle signal received by the slave; the OC module is connected to the switch module and the vehicle signal end respectively, and is used to pull down the voltage of the vehicle signal end when turned on, and not output a signal to the vehicle signal end when turned off. The vehicle sends a signal to the slave through the first branch, and turns on and off according to the vehicle signal through the switch module, and the OC module pulls down the voltage or does not output a signal according to the conduction of the switch module, so as to avoid error frame transmission in communication, and thus there is no need to use a LIN chip, and only the switch module and the OC module are needed to realize the communication between the on-board slave device (cooling / lubricating water pump / oil pump) and the vehicle, further reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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 described below are only some embodiments of the utility model. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 It is a structural principle diagram of the communication circuit in the utility model.

[0034] Figure 2 It is a structural principle diagram of another embodiment of the communication circuit in the utility model.

[0035] Figure 3 It is a circuit diagram of a communication circuit in the utility model.

[0036] The symbols in the accompanying drawings are: 100, switch module; 200, OC module; TX, transmitting end; RX, receiving end; 300, first protection unit; 410, voltage dividing unit; 420, filtering unit; 430, second protection unit; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor;

[0037] R5, the fifth resistor; R6, the sixth resistor; R7, the seventh resistor; C1, the first capacitor; CX, the filter capacitor; Q1, the first transistor; Q2, the second transistor; VCC, the first power supply voltage; VEE, the second power supply voltage; D1, the bipolar diode; VD1, the voltage regulator. DETAILED DESCRIPTION

[0038] The utility model provides a communication circuit and a communication chip. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0039] In the embodiments and patent claims, unless the article is specifically limited in the text, "a", "an", "said" and "the" may also include plural forms. If there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0040] It should be further understood that the term "comprising" used in the specification of the present utility model refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can also be intermediate elements. In addition, the "connection" or "coupling" used here can include wireless connection or wireless coupling. The term "and / or" used here includes all or any unit and all combinations of one or more associated listed items.

[0041] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the utility model belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as the meaning in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0042] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0043] Please also see Figures 1 to 3 , the utility model provides a preferred embodiment of a communication circuit.

[0044] like Figure 1 As shown, a communication circuit provided by the utility model is respectively connected to the slave and the whole vehicle signal end, including: a first branch and a second branch provided with a switch module 100 and an OC module 200; the first branch is respectively connected to the whole vehicle signal end and the receiving end RX of the slave, for transmitting the whole vehicle signal to the slave; the switch module 100 is respectively connected to the transmitting end TX of the slave, for shutting down or conducting according to the whole vehicle signal received by the slave; the OC module 200 is respectively connected to the switch module 100 and the whole vehicle signal end, for lowering the voltage of the whole vehicle signal end when conducting, and not outputting a signal to the whole vehicle signal end when shutting down.

[0045] Specifically, the transmitting end TX / receiving end RX of the slave can be understood as the transmitting end TX / receiving end RX of the single-chip microcomputer. In vehicle communication, it is necessary to utilize the one-to-many characteristics of the LIN signal, and it is necessary to ensure that there are no error frames in the communication. The communication information is composed of frame signals, and a frame signal includes a frame header and a response part. Therefore, the vehicle signal is first sent to the slave through the vehicle signal end, that is, the frame header is first transmitted to the receiving end RX of the slave. When the slave receives the vehicle signal through the receiving end RX, it will parse the vehicle signal. If there is no error frame, it will send a signal through the transmitting end TX of the slave to control the switch module 100 to turn on, and the OC module 200 will pull down the voltage of the vehicle signal end to respond and complete the signal transmission. If there is an error frame, a signal will be sent through the transmitting end TX of the slave to control the switch module 100 to be cut off, so that the OC module 200 cannot transmit the signal to the signal end of the whole vehicle, thereby avoiding the transmission of error frames in the communication, and thus there is no need to use a LIN chip. Only the switch module 100 and the OC module 200 are required to realize the communication between the on-board slave equipment (cooling / lubrication water pump / oil pump) and the whole vehicle, further reducing costs.

[0046] In one embodiment, if Figure 2 As shown, the communication circuit further includes a first protection unit 300; the first protection unit 300 is respectively connected to the transmitting end TX of the slave and the switch module 100, and is used for performing overcurrent protection on the transmitting end TX of the slave.

[0047] Specifically, the first protection unit 300 may be a resistor, which prevents the current of the transmitting terminal TX of the slave from being too large and burning the transmitting terminal TX of the slave through the impedance of the resistor.

[0048] In one embodiment, if Figure 3 As shown, the switch module 100 includes a first resistor R1 and a first transistor Q1; one end of the first resistor R1 is connected to the first power supply voltage VCC, and the other end of the first resistor R1 is connected to the first protection unit 300; the base of the first transistor Q1 is connected to the first protection unit 300, the emitter of the first transistor Q1 is connected to the first power supply voltage VCC, and the collector of the first transistor Q1 is connected to the OC module 200.

[0049] Specifically, the switch module 100 further includes a filter capacitor CX, one end of which is connected to the first power supply voltage VCC, and the other end of which is connected to the base of the first transistor Q1. The filter capacitor CX is used to filter the first power supply voltage VCC to provide a stable DC bias for the first transistor Q1.

[0050] In this embodiment, if the slave machine parses the vehicle signal and the parsed vehicle signal is an error frame, the transmitting end TX of the slave machine will not send a signal, and the transmitting end TX of the slave machine defaults to a high level, that is, the base of the first transistor Q1 receives a high level by default, and the first transistor Q1 remains in the cut-off state.

[0051] If the analyzed vehicle signal is not an error frame, the slave will send a low level to the first transistor Q1 through the transmitting terminal TX, thereby controlling the first transistor Q1 to be turned on. The first resistor R1 is a bias resistor of the first transistor Q1, providing a bias voltage for the first transistor Q1.

[0052] In one embodiment, if Figure 3 As shown, the OC module 200 includes a second resistor R2, a third resistor R3 and a second transistor Q2; one end of the second resistor R2 is connected to the switch module 100, the other end of the second resistor R2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is grounded; the base of the second transistor Q2 is connected to the lead end of the third resistor R3, the emitter of the second transistor Q2 is grounded, and the collector of the second transistor Q2 is connected to the vehicle signal end.

[0053] Specifically, the OC module 200 is used for level conversion and improving driving capability. It should be noted that the first power supply voltage VCC is a low voltage of 3.3V, and the second power supply voltage VEE is the driving voltage of the whole vehicle, which is generally 12V. When the switch module 100 is turned on, the second transistor Q2 will be controlled to be turned on with a 3.3V logic high level to lower the voltage of the signal end of the whole vehicle, that is, to control the level output of 12V (second power supply voltage VEE) on the vehicle with 3.3V logic, thereby improving the driving capability of the circuit.

[0054] In one embodiment, if Figure 2 As shown, the first branch includes a voltage divider unit 410 and a filter unit 420; the voltage divider unit 410 is connected to the vehicle signal terminal for voltage division of the vehicle signal. The filter unit 420 is connected to the voltage divider unit 410 for filtering the vehicle signal.

[0055] Specifically, Figure 3 As shown, the voltage dividing unit 410 includes a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6; one end of the fourth resistor R4 is connected to the second power supply voltage VEE, and the other end of the fourth resistor R4 is connected to the vehicle signal end; one end of the fifth resistor R5 is connected to the filtering unit 420, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is grounded.

[0056] The filtering unit 420 is an RC filtering circuit, and the filtering unit 420 includes a seventh resistor R7 and a first capacitor C1. One end of the seventh resistor R7 is connected to one end of the sixth resistor R6, and the other end of the seventh resistor R7 is respectively connected to the receiving end RX of the slave and one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded.

[0057] The fourth resistor R4 is a pull-up resistor of the vehicle signal end, and the fifth resistor R5 and the sixth resistor R6 divide the vehicle signal to prevent the receiving end RX of the slave from being damaged due to excessive voltage. The RC filter circuit filters the vehicle signal to filter out interference signals for the frame signal.

[0058] In one embodiment, if Figure 2 As shown, the first branch includes a second protection unit 430; the second protection unit 430 is respectively connected to the first power supply voltage VCC and the receiving end RX of the slave, and is used to perform voltage stabilization protection on the receiving end RX of the slave.

[0059] Specifically, Figure 3As shown, the second protection unit 430 includes a bipolar diode D1 and a voltage regulator tube VD1; the anode of the bipolar diode D1 is grounded, the cathode of the bipolar diode D1 is connected to the first power supply voltage VCC, the common end of the bipolar diode D1 is connected to the receiving end RX of the slave; the cathode of the voltage regulator tube VD1 is connected to the receiving end RX of the slave, and the anode of the voltage regulator tube VD1 is grounded. The first power supply voltage VCC is stabilized by the bipolar diode D1 and the voltage regulator tube VD1 to prevent the first power supply voltage VCC from burning out the receiving end RX of the slave due to overvoltage.

[0060] The utility model also provides a communication chip, including the communication circuit as described above. The details are as described in an embodiment of the communication circuit, which will not be described in detail here.

[0061] In summary, the utility model provides a communication circuit and a communication chip, wherein the communication circuit is respectively connected to a slave machine and a vehicle signal end, and comprises: a first branch and a second branch provided with a switch module and an OC module; the first branch is respectively connected to the vehicle signal end and the receiving end of the slave machine, and is used to transmit the vehicle signal to the slave machine; the switch module is respectively connected to the transmitting end of the slave machine, and is used to shut down or conduct according to the vehicle signal received by the slave machine; the OC module is respectively connected to the switch module and the vehicle signal end, and is used to lower the voltage of the vehicle signal end when conducting, and not output a signal to the vehicle signal end when shutting down. The signal transmission from the whole vehicle to the slave is realized through the first branch, and the switch module is turned on and off according to the signal of the whole vehicle, and the OC module pulls down the voltage or does not output the signal according to the conduction status of the switch module, so as to avoid the transmission of error frames in the communication. Therefore, there is no need to use the LIN chip. Only the switch module and the OC module are needed to realize the communication between the slave equipment on the vehicle (cooling / lubrication water pump / oil pump) and the whole vehicle, thereby further reducing the cost.

[0062] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A communication circuit, connected to a slave device and a vehicle signal terminal respectively, characterized in that: include: A first branch and a second branch provided with a switch module and an OC module; The first branch is connected to the vehicle signal terminal and the receiving terminal of the slave device respectively, and is used to transmit the vehicle signal to the slave device; The switch modules are respectively connected to the transmitting ends of the slaves, and are used to switch off or on according to the vehicle signal received by the slaves; The OC module is connected to the switch module and the vehicle signal end respectively, and is used to lower the voltage of the vehicle signal end when it is turned on, and not output a signal to the vehicle signal end when it is turned off.

2. The communication circuit according to claim 1, characterized in that: Also included is a first protection unit; The first protection unit is connected to the sending end of the slave and the switch module respectively, and is used to perform overcurrent protection on the sending end of the slave.

3. The communication circuit according to claim 2, characterized in that: The switch module includes a first resistor and a first transistor; One end of the first resistor is connected to a first power supply voltage, and the other end of the first resistor is connected to the first protection unit; The base of the first transistor is connected to the first protection unit, the emitter of the first transistor is connected to a first power supply voltage, and the collector of the first transistor is connected to the OC module.

4. The communication circuit according to claim 1, characterized in that: The OC module includes a second resistor, a third resistor and a second triode; One end of the second resistor is connected to the switch module, the other end of the second resistor is connected to one end of the third resistor, and the other end of the third resistor is grounded; The base of the second transistor is connected to one end of the third resistor, the emitter of the second transistor is grounded, and the collector of the second transistor is connected to the vehicle signal terminal.

5. The communication circuit according to claim 1, characterized in that: The first branch includes a voltage dividing unit; The voltage dividing unit is connected to the vehicle signal terminal and is used for voltage dividing the vehicle signal.

6. The communication circuit according to claim 5, characterized in that: The first branch includes a filtering unit; The filtering unit is connected to the voltage dividing unit and is used for filtering the whole vehicle signal.

7. The communication circuit according to claim 1, characterized in that: The first branch includes a second protection unit; The second protection unit is connected to the first power supply voltage and the receiving end of the slave device respectively, and is used for performing voltage stabilization protection on the receiving end of the slave device.

8. The communication circuit according to claim 6, characterized in that: The voltage dividing unit includes a fourth resistor, a fifth resistor and a sixth resistor; One end of the fourth resistor is connected to the second power supply voltage, and the other end of the fourth resistor is connected to the vehicle signal terminal; One end of the fifth resistor is connected to the filtering unit, the other end of the fifth resistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded.

9. The communication circuit according to claim 7, characterized in that: The second protection unit includes a bipolar diode and a voltage regulator tube; The anode of the bipolar diode is grounded, the cathode of the bipolar diode is connected to the first power supply voltage, and the common end of the bipolar diode is connected to the receiving end of the slave; The cathode of the voltage regulator tube is connected to the receiving end of the slave, and the anode of the voltage regulator tube is grounded.

10. A communication chip, characterized in that: Comprising the communication circuit as described in any one of claims 1-9.