Controller terminal resistance selection circuit with CAN network

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By designing a controller terminal resistor selection circuit with CAN network, and using the plug-in or de-connection of short connectors to determine the connection method of resistors, the problem of controllers in the prior art need to design and manufacture different models based on whether they have terminal resistors, and a terminal resistor selection scheme with simple structure, easy resistance selection and cost-saving cost are realized.

CN222939405UActive Publication Date: 2025-06-03SHENZHEN ESPIRIT TECH

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Patent Information

Application Number: CN202421734030.0
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-07-22
Publication Date: 2025-06-03
Estimated Expiration: 2034-07-22

AI Technical Summary

Technical Problem

In the prior art, controllers installed on the entire vehicle CAN network need to design and manufacture different types of controllers based on whether they have terminal resistors, resulting in increased design and manufacturing costs and prone to using the wrong controller.

Method used

A controller terminal resistor selection circuit with CAN network is designed. Through the combination of external plug-in JP3, main control unit and short-connection, the connection method of the resistor is determined by plugging or de-connecting of the short-connection, so as to achieve the choice of whether the controller has a resistor.

Benefits of technology

It realizes a terminal resistor selection solution with a simple structure, easy resistance selection and cost-saving termination resistance, avoids the design and manufacturing of different types of controllers, reduces the risk of using the wrong controller, and effectively saves application costs.

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Abstract

The utility model discloses a controller terminal resistance selection circuit with a CAN network, which comprises an external connector JP3, a main control unit and a short circuit piece, the CANL end and the CANH end of the main control unit are respectively connected with the ninth pin and the tenth pin of the external connector JP3, a resistor R112 is connected between the second pin and the tenth pin of the external connector JP3, and the short circuit piece is connected with the external connector JP3. When a resistor needs to be arranged between the CANL end and the CANH end of the main control unit, the second pin and the ninth pin of the external connector JP3 are in short circuit through the short circuit piece, and when the resistor does not need to be arranged between the CANL end and the CANH end of the main control unit, the short circuit piece connected between the second pin and the ninth pin of the external connector JP3 is removed. Compared with the prior art, the controller can work with a resistor or without the resistor only by selecting whether the short-circuit piece is inserted or not, the structure is simple, circuits of different types do not need to be arranged, and application cost can be effectively saved.

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Description

Technical Field

[0001] The utility model relates to a controller with a CAN network, in particular to a terminal resistor selection circuit for a controller with a CAN network. Background Art

[0002] In the prior art, many controllers are mounted on the vehicle CAN network, and the total resistance is generally not less than 60 ohms. This requires that among many controllers, some do not have terminal resistors, and some have terminal resistors. However, the terminal resistor is usually fixedly installed on the controller. To meet different matching requirements, different models of controllers need to be designed and manufactured with or without terminal resistors, which not only increases the design and manufacturing costs, but also easily leads to situations such as using the wrong controller in actual applications. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a terminal resistor selection circuit for a controller with a CAN network, which has a simple structure, is easy to select resistors, and saves costs, aiming at the deficiencies of the prior art.

[0004] To solve the above technical problem, the utility model adopts the following technical solutions.

[0005] A terminal resistor selection circuit for a controller with a CAN network includes an external plug-in JP3, a main control unit, and the short-circuiting member. The CANL terminal and the CANH terminal of the main control unit are respectively connected to the 9th pin and the 10th pin of the external plug-in JP3. A resistor R112 is connected between the 2nd pin and the 10th pin of the external plug-in JP3. When a resistor is required between the CANL terminal and the CANH terminal of the main control unit, the 2nd pin and the 9th pin of the external plug-in JP3 are short-circuited by using the short-circuiting member. When a resistor is not required between the CANL terminal and the CANH terminal of the main control unit, the short-circuiting member connected between the 2nd pin and the 9th pin of the external plug-in JP3 is removed.

[0006] Preferably, the model of the external plug-in JP3 is TE-1-1827875-6.

[0007] Preferably, the resistance value of the resistor R112 is 120Ω.

[0008] In the terminal resistor selection circuit of the controller with a CAN network disclosed by the present utility model, the external plug-in JP3 serves as the external plug-in of the controller. The CANL terminal and the CANH terminal of the main control unit are respectively connected to the 9th pin and the 10th pin of the external plug-in JP3. Meanwhile, the resistor R112 with a specified resistance value is connected in series between the 2nd pin and the 10th pin of the external plug-in JP3. If the controller does not need to be equipped with a resistor, the shorting piece is not used, and there is an open circuit relationship between the CANL terminal and the CANH terminal of the main control unit. When the controller needs to be equipped with a resistor, only by using the shorting piece to short-circuit the 2nd pin and the 9th pin of the external plug-in JP3, the resistor R112 can be directly connected between the CANL terminal and the CANH terminal of the main control unit. Based on the above structure, it can be seen that the present utility model can realize the operation of the controller with or without a resistor only by selecting whether to insert the shorting piece. It not only has a simple structure, but also does not need to set different types of circuits, which can effectively save the application cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the terminal resistor selection circuit of the controller with a CAN network of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] The present utility model will be described in more detail below with reference to the drawings and embodiments.

[0011] The present utility model discloses a terminal resistor selection circuit of a controller with a CAN network. Please refer to Figure 1 , which includes an external plug-in JP3, a main control unit and the shorting piece. The CANL terminal and the CANH terminal of the main control unit are respectively connected to the 9th pin and the 10th pin of the external plug-in JP3. A resistor R112 is connected between the 2nd pin and the 10th pin of the external plug-in JP3. When a resistor is needed between the CANL terminal and the CANH terminal of the main control unit, the 2nd pin and the 9th pin of the external plug-in JP3 are short-circuited by using the shorting piece. When a resistor is not needed between the CANL terminal and the CANH terminal of the main control unit, the shorting piece connected between the 2nd pin and the 9th pin of the external plug-in JP3 is removed.

[0012] In the above circuit, the external plug-in JP3 serves as the external plug-in of the controller. The CANL terminal and the CANH terminal of the main control unit are respectively connected to the 9th pin and the 10th pin of the external plug-in JP3. At the same time, the resistor R112 with a specified resistance value is connected in series between the 2nd pin and the 10th pin of the external plug-in JP3. If the controller does not need to carry a resistor, the shorting piece is not used, and there is an open circuit relationship between the CANL terminal and the CANH terminal of the main control unit. When the controller needs to carry a resistor, only the 2nd pin and the 9th pin of the external plug-in JP3 need to be shorted by using the shorting piece, so that the resistor R112 is directly connected between the CANL terminal and the CANH terminal of the main control unit. Based on the above structure, it can be seen that the present invention only needs to select whether to insert the shorting piece to enable the controller to work with or without a resistor, which is not only simple in structure but also does not require setting different types of circuits, effectively saving the application cost.

[0013] As a preferred method, the model of the external plug-in JP3 is TE-1-1827875-6. Among them, the external plug-in of this model is a 16-pin plug-in, but in actual applications, it can also be replaced with plug-ins with other numbers of pins.

[0014] In this embodiment, the resistance value of the resistor R112 is 120Ω. In actual applications, the functions of the termination resistor of the CAN network controller include: first, it can improve the anti-interference ability; second, it can improve the signal quality; in addition, it is also beneficial for the bus to quickly enter the recessive state.

[0015] The termination resistor selection circuit of the controller with a CAN network disclosed by the present invention reserves a pin pin2 on the external plug-in JP3 inside the control board and connects it to the CANH through a 120-ohm resistor. During application, if the controller on the CAN network needs to carry a 120-ohm termination resistor, then short-circuit pin2 and pin9 at the external plug-in end of the controller, so that there is a 120-ohm termination resistor between the CANL and the CANH, thus meeting the application requirements.

[0016] The above description is only a preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, or improvements made within the technical scope of the present invention shall be included within the scope protected by the present invention.

Claims

1. A controller terminal resistance selection circuit with a CAN network, characterized in that: The invention comprises an external connector JP3, a main control unit and a short-circuit component. The CANL terminal and the CANH terminal of the main control unit are respectively connected to the 9th pin and the 10th pin of the external connector JP3. A resistor R112 is connected between the 2nd pin and the 10th pin of the external connector JP3. When a resistor is required between the CANL terminal and the CANH terminal of the main control unit, the 2nd pin and the 9th pin of the external connector JP3 are short-circuited by the short-circuit component. When a resistor is not required between the CANL terminal and the CANH terminal of the main control unit, the short-circuit component connected between the 2nd pin and the 9th pin of the external connector JP3 is removed.

2. The controller terminal resistance selection circuit with CAN network as claimed in claim 1, characterized in that: The model of the external connector JP3 is TE-1-1827875-6.

3. The controller terminal resistance selection circuit with CAN network as claimed in claim 1, characterized in that: The resistance value of the resistor R112 is 120Ω.