CN211880692U - Circuit for circuit board, circuit board and engine control unit - Google Patents
Circuit for circuit board, circuit board and engine control unit Download PDFInfo
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- CN211880692U CN211880692U CN202020571625.4U CN202020571625U CN211880692U CN 211880692 U CN211880692 U CN 211880692U CN 202020571625 U CN202020571625 U CN 202020571625U CN 211880692 U CN211880692 U CN 211880692U
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Abstract
The utility model provides a circuit for circuit board, it includes a circuit for circuit board, and it includes first end, second end and the trunk road that couples together first end and second end. The circuit comprises a first branch connected with the trunk, and the tail end of the first branch is divided into at least two branches. The at least two branches are two of a first pull-up, a second pull-up, and a pull-down. The first branch is provided with a first resistor installation part, and the tail end of the first branch is connected with the first branch and the second branch. The resistor is characterized in that a second resistor installation part is arranged on the first branch, a third resistor installation part is arranged on the second branch, and a first resistor is installed at the first resistor installation part. And a resistor is arranged at only one position of the second resistor installation part and the third resistor installation part according to requirements. The utility model discloses a circuit for circuit board can reduce the area of circuit board.
Description
Technical Field
The utility model relates to a circuit, have circuit board of this circuit and have engine control unit of this circuit board for circuit board.
Background
Referring to fig. 1, a circuit for a circuit board in the prior art generally includes a first end portion, a second end portion, and a trunk connecting the first end portion and the second end portion. The first end is connected to the input and the second end is connected to the microprocessor. The circuit also comprises a first capacitor C1, a second capacitor C2 and a resistor R5 which are directly connected with the main circuit. The trunk circuit is provided with a resistor R4. The circuit also includes a first pull-up to V1, a second pull-up to V2, and a pull-down to ground. The first pull-up is provided with a resistor R1, the second pull-up is provided with a resistor R3, and the underground pull is provided with a resistor R2. The first pull-up, the second pull-up and the underground pull are all directly connected to the trunk line. In designing the circuit board, it is necessary to previously predict the mounting of the resistors R1, R2, and R3. When a first pull-up is required, resistor R1 is installed. When a second pull-up is required, resistor R3 is installed. When a pull down to ground is required, resistor R2 is installed. Since the resistors R1, R2 and R3 need to reserve a large mounting area, a large area of circuit board is occupied.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a reducible circuit board area's circuit that is used for circuit board.
According to one aspect of the present invention, a circuit for a circuit board is provided that includes a first end, a second end, and a stem connecting the first end and the second end. The circuit comprises a first branch connected with the trunk, and the tail end of the first branch is divided into at least two branches. The at least two branches are two of a first pull-up, a second pull-up, and a pull-down. Be equipped with first resistance installation department on the first branch road, the end connection first branch and second branch of first branch road. The resistor is characterized in that a second resistor installation part is arranged on the first branch, a third resistor installation part is arranged on the second branch, and a first resistor is installed at the first resistor installation part. And a resistor is arranged at only one position of the second resistor installation part and the third resistor installation part according to requirements.
Preferably, the resistance value of the first resistor is larger than the resistance values of the resistors which can be mounted on the first resistor mounting part and the second resistor mounting part.
Preferably, the second resistor mounting part and the third resistor mounting part are used for mounting resistors with the same size, and the resistance value of the resistor mounted at the position is approximately 0.
Preferably, the end of the first branch is further connected with a third branch, the third branch is provided with a fourth resistor installation part, and the second resistor installation part, the third resistor installation part and the fourth resistor installation part only have one resistor installation part as required.
Preferably, the second resistor mounting part, the third resistor mounting part and the fourth resistor mounting part are used for mounting resistors with the same size.
Preferably, the first resistance mounting part has a mounting dimension larger than mounting dimensions of the second, third and fourth resistance mounting parts.
Preferably, the first branch is a 5V pull-up, the second branch is a 12V pull-up, and the third branch is a pull-down.
Preferably, a fifth resistor is disposed on the trunk, the first branch and the trunk intersect at a first fulcrum, the circuit further includes a first capacitor having one end grounded and the other end intersected with the trunk at a second fulcrum, a second capacitor having one end grounded and the other end intersected with the trunk at a third fulcrum, and a sixth resistor having one end grounded and the other end intersected with the trunk (4) at a fourth fulcrum, the first fulcrum is located between the fifth resistor and the first end, the second fulcrum is located between the first fulcrum and the first end, the third fulcrum is located between the fifth resistor and the second end, and the fourth fulcrum is located between the third fulcrum and the fifth resistor.
Preferably, the circuit is for an engine control unit.
Through the setting, the utility model provides a circuit for circuit board can reduce the area of circuit board, saves manufacturing cost.
Drawings
Fig. 1 is a prior art circuit for a circuit board.
Fig. 2 is a circuit for a circuit board according to the present invention.
Detailed Description
Referring to fig. 2, the present invention is a circuit for a circuit board, which includes a first end portion 1, a second end portion 2, and a trunk 4 connecting the first end portion 1 and the second end portion 2. The circuit further comprises a first branch 3 connected to the trunk 4, the end of the first branch 3 branching into a first branch 31, a second branch 32 and a third branch 33. The first branch 31 is pulled up by a first voltage V1, the second branch 32 is pulled up by a second voltage V2, and the third branch 33 is pulled down. The first branch 3 is provided with a first resistor mounting portion. The end of the first branch 3 connects a first branch 31, a second branch 32 and a third branch 33. The first branch 31 is provided with a second resistor mounting portion, the second branch 32 is provided with a third resistor mounting portion, and the third branch 33 is provided with a fourth resistor mounting portion. The first resistor R6 is attached to the first resistor mounting portion, and the resistor is attached to only one of the second resistor mounting portion, the third resistor mounting portion, and the fourth resistor mounting portion, as necessary. Although in the present embodiment only circuits with three branches are described, circuits with other numbers of branches are also within the scope of the present application, such as two branches, four branches or more.
The trunk 4 is provided with a fifth resistor R4. The first branch 3 intersects the trunk 4 at a first branch point 41. The circuit further includes a first capacitor C1 having one end connected to ground and the other end intersecting the trunk 4 at the second pivot 42, a second capacitor C2 having one end connected to ground and the other end intersecting the trunk 4 at the third pivot 43, and a sixth resistor R5 having one end connected to ground and the other end intersecting the trunk 4 at the fourth pivot 44. The first fulcrum 41 is located between the fifth resistor R4 and the first end 1, the second fulcrum 42 is located between the first fulcrum 41 and the first end 1, the third fulcrum 43 is located between the fifth resistor R4 and the second end 2, and the fourth fulcrum 44 is located between the third fulcrum 43 and the fifth resistor R4.
The resistance of the first resistor R6 is greater than the resistances of the resistors mountable in the first, second and third resistor mounting portions. The second resistor mounting part, the third resistor mounting part and the fourth resistor mounting part are used for mounting resistors with the same size, and the resistance value of the mounted resistors is approximately 0. Ideally, the second, third and fourth resistive mounting portions are for mounting a 0 ohm resistor. However, there is no resistance of 0 ohms in practice, so a resistance of approximately 0, such as 50 milliohms, will generally be chosen. Preferably, the second resistor mounting portion, the third resistor mounting portion and the fourth resistor mounting portion are used for mounting resistors with the same size. The mounting dimension of the first resistor mounting portion is larger than the mounting dimensions of the second resistor mounting portion, the third resistor mounting portion and the fourth resistor mounting portion. By this arrangement, the area of the circuit board can be made smaller. Because the second resistance installation part, the third resistance installation part and the fourth resistance installation part are reserved with the resistance with smaller installation size, the first resistance installation part is reserved with the resistance with larger installation size. In the traditional design, resistors with larger mounting size are reserved in the resistor mounting parts of all branches. Intersecting with conventional designs, the design of the present invention can reduce the area of the circuit board.
In the present embodiment, the first capacitor C1 is 0603-sealed, the second capacitor C2 is 0402-sealed, the resistor R6 attachable to the first resistor mounting portion is 0805-sealed, the resistor R7 attachable to the second resistor mounting portion is 0402-sealed, the resistor R8 attachable to the third resistor mounting portion is 0402-sealed, and the resistor R9 attachable to the fourth resistor mounting portion is 0402-sealed. The fifth resistor R4 is packaged with 0603, and the sixth resistor R5 is packaged with 0402.
The first branch 31 is a 5V pull-up, the second branch 32 is a 12V pull-up, and the third branch 33 is a pull-down. In actual use, the first branch 31 and the second branch may be pulled up by other voltages.
During design, one branch mounting resistor is selected according to requirements. For example, when a 5V pull-up is required, a larger resistor is mounted at the first resistor mounting portion, a smaller resistor is mounted at the second resistor mounting portion, and no resistor is mounted at the other resistor mounting portions. When 12V pull-up is required, a larger resistor is mounted at the first resistor mounting part, a smaller resistor is mounted at the third resistor mounting part, and no resistor is mounted at the other resistor mounting parts. And so on.
The circuit for a circuit board of the present invention can be applied to an engine control unit, and of course, can be applied to other electronic control units with pull-up or pull-down circuits.
It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (10)
1. A circuit for a circuit board comprising a first end portion (1), a second end portion (2) and a trunk (4) connecting the first end portion (1) and the second end portion (2), characterized in that the circuit comprises a first branch (3) connected to a trunk (4), the end of the first branch (3) is divided into at least two branches, the at least two branches are two of a first pull-up, a second pull-up and a pull-down, a first resistor installation part is arranged on the first branch (3), the tail end of the first branch (3) is connected with a first branch (31) and a second branch (32), a second resistor installation part is arranged on the first branch (31), a third resistor installation part is arranged on the second branch (32), a first resistor (R6) is installed at the first resistor installation part, and a resistor is arranged at only one position of the second resistor installation part and the third resistor installation part according to requirements.
2. The circuit of claim 1, wherein the first resistor (R6) has a resistance greater than the resistances of the first and second resistor mounts.
3. The circuit of claim 2, wherein the second and third resistor mounting portions are for mounting resistors of the same size and the resistance of the resistor mounted thereto is approximately 0.
4. The circuit according to claim 2, wherein the end of the first branch (3) is further connected to a third branch (33), a fourth resistor mounting part is provided on the third branch (33), and the second resistor mounting part, the third resistor mounting part and the fourth resistor mounting part have only one resistor as required.
5. The circuit of claim 4, wherein the second, third and fourth resistive mounting portions are configured to mount resistors of the same size.
6. The circuit of claim 4, wherein the first resistive mounting feature has a mounting dimension that is greater than a mounting dimension of the second resistive mounting feature, the third resistive mounting feature, and the fourth resistive mounting feature.
7. The circuit according to claim 4, wherein the first branch (31) is a 5V pull-up, the second branch (32) is a 12V pull-up, and the third branch (33) is a pull-down to ground.
8. A circuit as claimed in claim 1, characterized in that a fifth resistor (R4) is provided on the trunk (4), the first branch (3) intersecting the trunk (4) at a first pivot (41), the circuit further comprising a first capacitor (C1) connected at one end to ground and at the other end to the trunk (4) at a second pivot (42), a second capacitor (C2) connected at one end to ground and at the other end to the trunk (4) at a third pivot (43), and a sixth resistor (R5) connected at one end to ground and at the other end to the trunk (4) at a fourth pivot (44), the first pivot (41) being located between the fifth resistor (R4) and the first end (1), the second pivot (42) being located between the first pivot (41) and the first end (1), the third pivot (43) being located between the fifth resistor (R4) and the second end (2), the fourth fulcrum (44) is located between the third fulcrum (43) and a fifth resistor (R4).
9. A circuit board, characterized in that it comprises a circuit according to any one of claims 1 to 8.
10. An engine control unit, characterized in that it comprises a circuit board according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020571625.4U CN211880692U (en) | 2020-04-16 | 2020-04-16 | Circuit for circuit board, circuit board and engine control unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020571625.4U CN211880692U (en) | 2020-04-16 | 2020-04-16 | Circuit for circuit board, circuit board and engine control unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211880692U true CN211880692U (en) | 2020-11-06 |
Family
ID=73250697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020571625.4U Active CN211880692U (en) | 2020-04-16 | 2020-04-16 | Circuit for circuit board, circuit board and engine control unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211880692U (en) |
-
2020
- 2020-04-16 CN CN202020571625.4U patent/CN211880692U/en active Active
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