Copper foil for wiring of circuit boards and circuit boards

Abstract

The present invention provides a wiring copper foil for a circuit board and a circuit board. The wiring copper foil includes a strip copper foil portion and a raised portion, the raised portion includes a plurality of first raised portions, the plurality of first raised portions are arranged on one side of the strip copper foil portion, and the plurality of first raised portions are arranged in sequence and spaced apart along the length direction of the strip copper foil portion. The wiring copper foil and the circuit board of the present invention have raised portions, and the raised portions can change the impedance of the copper foil, that is, the synchronization problem of on-off and the uniformity of heating can be solved by solving the problem of difference in routing impedance, that is, the current balancing and signal synchronization problems can be solved by differentiated control of wiring, thereby ensuring the reliability of components. The present invention mainly controls high-current load switching devices, high-power switching devices, and low-voltage high-power switching devices, and can synchronize the on and off of the switching device array.

Description

Technical Field

[0001] The invention relates to the technical field of electrical control, in particular to a wiring copper foil for a circuit board and a circuit board. Background Art

[0002] Circuit boards can miniaturize and visualize circuits, and play an important role in the mass production of fixed circuits and the optimization of electrical appliance layout. Circuit boards are often used in various electrical appliances to improve intelligence. For example, circuit boards can be used in air conditioners, refrigerators, and so on. Circuit boards usually have copper foil, which is a thin, continuous layer of metal foil deposited on the base layer of the circuit board. As a conductor, it is easy to adhere to the insulating layer, accept the printed protective layer, and form a circuit pattern after corrosion. Most copper foils are 35μm thick, which is multiplied by the line width to get the cross-sectional area. There is an empirical formula for current density, which is 15-25A / mm 2 , multiply it by the cross-sectional area to get the flow capacity I = KT 0.44 A 0.75 , K is the correction coefficient, generally the copper-clad wire is 0.024 in the inner layer and 0.048 in the outer layer, T is the maximum temperature rise, unit K (the melting point of copper is 1060℃), generally the temperature rise we allow is 10K, A is the copper-clad cross-sectional area, unit square mil (square mil), I is the maximum allowable current, unit A, generally 10mil=0.01inch=0.0254mm, which can be 1A. The inventor found that the conduction and shutdown of the low-voltage and low-resistance switching devices on the circuit board are asynchronous, and the asynchronous nature is easy to cause instantaneous impact damage to the components. Summary of the invention

[0003] The inventor of the present invention has found that the on and off of the low-voltage and low-resistance switching devices on the circuit board are asynchronous, and the cause of the problem is that the general power switching devices are large in size and the space on the circuit board is limited, so the wiring is often not completely matched, so the on-impedance of the wiring is inconsistent, R = ρL / (0.03W). The conductivity of copper is ρ = 0.0175Ω / m. L is the line length, and W is the line width. Therefore, the generated R = 0.0175L / (0.03W) = 7ΔL / (12*W). Taking the line width of 10mm and the line length difference of 20mm as an example, the impedance difference ΔR = 1.17mΩ. Calculated based on the current of 50A, the voltage drop ΔV = ΔR*I = 1.17mΩ*100A = 0.058V. For voltage-sensitive devices, it is very likely to cause asynchronous on and off problems. Based on this, the present invention proposes a wiring copper foil for a circuit board and a circuit board, which mainly solves the on-off synchronization problem of low-voltage and low-resistance switching devices.

[0004] On the one hand, the present invention provides a wiring copper foil for a circuit board, which includes a strip copper foil portion and a raised portion, wherein the raised portion includes a plurality of first raised portions, the plurality of first raised portions are arranged on one side of the strip copper foil portion, and the plurality of first raised portions are arranged in sequence and spaced apart along the length direction of the strip copper foil portion.

[0005] Optionally, the protruding portion further includes a plurality of second protrusions, the plurality of second protrusions are arranged on the other side of the strip-shaped copper foil portion, and the plurality of second protrusions are arranged in sequence and spaced apart along the length direction of the strip-shaped copper foil portion.

[0006] Optionally, the plurality of first protrusions and the plurality of second protrusions are symmetrically arranged along a reference plane perpendicular to the width direction of the strip-shaped copper foil portion.

[0007] Optionally, two ends of the strip copper foil portion are respectively a high voltage end and a low voltage end, and a distance between the protruding portion and the high voltage end is greater than a distance between the protruding portion and the low voltage end, so that the protruding portion is adjacent to the low voltage end.

[0008] Optionally, a plurality of the first protrusions are arranged on one side of the strip-shaped copper foil portion along its width direction;

[0009] The ratio of the protruding length of each of the first protrusions along the width direction of the strip-shaped copper foil portion to the width of the strip-shaped copper foil portion is less than or equal to 1 / 5;

[0010] The length of the connection between each first protrusion and the strip-shaped copper foil portion is greater than or equal to the length of other portions of the first protrusion extending along the length direction of the strip-shaped copper foil portion;

[0011] The ratio between the protruding length of each first protrusion and the length of the connecting portion of the first protrusion is less than or equal to 1 / 2;

[0012] The distance between every two adjacent first protrusions is smaller than the length of the connection.

[0013] Optionally, a ratio of a total length of all the first protrusions connected to the strip-shaped copper foil portion to a length of the strip-shaped copper foil portion is less than 1 / 2.

[0014] Optionally, each of the first protrusions is symmetrically arranged along a reference plane perpendicular to the length direction of the strip-shaped copper foil portion.

[0015] Optionally, each of the first protrusions is triangular.

[0016] On the other hand, the present invention provides a circuit board, comprising a first copper foil and a second copper foil, wherein the length of the first copper foil is greater than the length of the second copper foil, the first copper foil is connected to a first switching device, and the second copper foil is connected to a second switching device, wherein the first copper foil is any one of the above-mentioned wiring copper foils, so that the conduction and shutdown of the first switching device are synchronized with the conduction and shutdown of the second switching device.

[0017] Optionally, the raised portion of the first copper foil is adjacent to the first switching device.

[0018] The wiring copper foil and circuit board of the present invention have a raised portion, which can change the impedance of the copper foil, that is, the synchronization problem of on-off and the uniformity of heating can be solved by the difference in routing impedance, that is, the current balancing and signal synchronization problems can be solved by differentiated control of wiring, thereby ensuring the reliability of components. The present invention mainly controls high-current load switch devices, high-power switch devices, and low-voltage high-power switch devices, and can synchronize the on and off of the switch device array.

[0019] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0021] Figure 1 is a schematic structural diagram of a wiring copper foil according to an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of a circuit board according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] Figure 1 FIG. 1 is a schematic structural diagram of a wiring copper foil according to an embodiment of the present invention. Figure 1As shown, an embodiment of the present invention provides a wiring copper foil for a circuit board, which includes a strip copper foil portion 21 and a protrusion portion, wherein the protrusion portion includes a plurality of first protrusions 22, and the plurality of first protrusions 22 are arranged on one side of the strip copper foil portion 21, and the plurality of first protrusions 22 are arranged in sequence and spaced along the length direction of the strip copper foil portion 21. For two copper foils on a circuit board, the impedance of the copper foil is changed by arranging a protrusion on one copper foil, that is, the synchronization problem of on-off and the problem of heating uniformity are solved by the difference in routing impedance, that is, the current balancing and signal synchronization problems are solved by differentiated control of wiring, thereby ensuring the reliability of components. The embodiment of the present invention can mainly control high-current load switching devices, high-power switching devices, and low-voltage high-power switching devices, and can synchronize the on and off of the switching device array.

[0024] In some embodiments of the present invention, the protrusion further includes a plurality of second protrusions 23, which are arranged on the other side of the strip copper foil portion 21, and the plurality of second protrusions 23 are arranged in sequence and spaced along the length direction of the strip copper foil portion 21. By arranging protrusions on both sides of the wiring copper foil, the current and signal transmission of the wiring copper foil can be made more accurate and smoother. Preferably, the plurality of first protrusions 22 and the plurality of second protrusions 23 are symmetrically arranged along a reference plane perpendicular to the width direction of the strip copper foil portion 21.

[0025] In some embodiments of the present invention, the two ends of the strip copper foil portion 21 are respectively a high voltage end and a low voltage end, and the distance between the protrusion and the high voltage end is greater than the distance between the protrusion and the low voltage end, so that the protrusion is close to the low voltage end. Usually, a power device is installed at the low voltage end, that is, the protrusion is arranged close to the power device to facilitate heat dissipation and signal transmission.

[0026] In some embodiments of the present invention, a plurality of first protrusions 22 are arranged on one side of the strip copper foil portion 21 along its width direction. The ratio between the protruding length a of each first protrusion 22 protruding along the width direction of the strip copper foil portion 21 and the width d of the strip copper foil portion 21 is less than or equal to 1 / 5. The length b of the connection of each first protrusion 22 connected to the strip copper foil portion 21 is greater than or equal to the length of other parts of the first protrusion 22 extending along the length direction of the strip copper foil portion 21. The ratio between the protruding length a of each first protrusion 22 and the length b of the connection of the first protrusion 22 is less than or equal to 1 / 2. The distance c between each two adjacent first protrusions 22 is less than or equal to the length b of the connection. In some optional embodiments, c≤a. The ratio between the total length of the connection of all first protrusions 22 connected to the strip copper foil portion 21 and the length of the strip copper foil portion 21 is less than 1 / 2. This arrangement can achieve a more excellent synchronization effect with a more optimal structural arrangement.

[0027] In some embodiments of the present invention, each first protrusion 22 is symmetrically arranged along a reference plane perpendicular to the length direction of the strip-shaped copper foil portion 21. Figure 1 As shown, each first protrusion 22 is triangular. In some optional embodiments, each first protrusion 22 may also be in the shape of a minor arc, a rectangle, etc.

[0028] Figure 2 is a schematic structural diagram of a circuit board according to an embodiment of the present invention. Figure 2 As shown, an embodiment of the present invention further provides a circuit board, comprising a first copper foil 20 and a second copper foil 30, wherein the length of the first copper foil 20 is greater than the length of the second copper foil 30, the first copper foil 20 is connected to a first switch device 41, and the second copper foil 30 is connected to a second switch device 42. The first copper foil 20 is a wiring copper foil in any of the above embodiments, so that the conduction and shutdown of the first switch device 41 are synchronized with the conduction and shutdown of the second switch device 42. The second copper foil 30 can be a conventional copper foil in the shape of a long strip, or it can be said that the second copper foil 30 only includes the strip copper foil portion 21 of the first copper foil 20. Further, the circuit board can also include a third copper foil, the length of the third copper foil can be greater than the first copper foil 20, the third copper foil can also be a wiring copper foil in any of the above embodiments, and the number of first protrusions 22 on the third copper foil can be greater than the number of first protrusions 22 on the first copper foil 20. Further, the protrusion of the first copper foil 20 is adjacent to the first switch device 41.

[0029] The embodiment of the present invention can mainly perform signal differentiation processing on both sides of the copper foil of the PCB copper foil wiring close to the power switch component to solve the impedance matching problem, that is, to solve the current sharing and signal synchronization problems through differentiated control of wiring, thereby ensuring the reliability of the components. The embodiment of the present invention can mainly control high-current load switch devices, high-power switch devices, and low-voltage high-power switch devices, and can synchronize the conduction and shutdown of the switch device array.

[0030] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A wiring copper foil for a circuit board, It is characterized in that It includes a strip copper foil portion and a raised portion, wherein the two ends of the strip copper foil portion are respectively a high voltage end and a low voltage end, and the distance between the raised portion and the high voltage end is greater than the distance between the raised portion and the low voltage end, so that the raised portion is adjacent to the low voltage end; the raised portion includes a plurality of first raised portions, and the plurality of first raised portions are arranged on one side of the strip copper foil portion, and the plurality of first raised portions are arranged in sequence and spaced apart along the length direction of the strip copper foil portion.

2. The wiring copper foil according to claim 1, It is characterized in that The protruding portion further includes a plurality of second protrusions, which are arranged on the other side of the strip-shaped copper foil portion, and are arranged in sequence and spaced apart along the length direction of the strip-shaped copper foil portion.

3. The wiring copper foil according to claim 2, It is characterized in that The plurality of first protrusions and the plurality of second protrusions are symmetrically arranged along a reference plane perpendicular to the width direction of the strip-shaped copper foil portion.

4. The wiring copper foil according to claim 1, It is characterized in that A plurality of the first protrusions are arranged on one side of the strip-shaped copper foil portion along the width direction thereof; The ratio of the protruding length of each of the first protrusions along the width direction of the strip-shaped copper foil portion to the width of the strip-shaped copper foil portion is less than or equal to 1 / 5; The length of the connection between each first protrusion and the strip-shaped copper foil portion is greater than or equal to the length of other portions of the first protrusion extending along the length direction of the strip-shaped copper foil portion; The ratio between the protruding length of each first protrusion and the length of the connecting portion of the first protrusion is less than or equal to 1 / 2; The distance between every two adjacent first protrusions is less than or equal to the length of the connection.

5. The wiring copper foil according to claim 1, It is characterized in that The ratio of the total length of the connection points of all the first protrusions connected to the strip-shaped copper foil portion to the length of the strip-shaped copper foil portion is less than 1 / 2.

6. The wiring copper foil according to claim 1, It is characterized in that Each of the first protrusions is symmetrically arranged along a reference plane perpendicular to the length direction of the strip-shaped copper foil portion.

7. The wiring copper foil according to claim 1, It is characterized in that Each of the first protrusions is triangular in shape.

8. A circuit board, comprising a first copper foil and a second copper foil, wherein the length of the first copper foil is greater than the length of the second copper foil, one end of the first copper foil is connected to a first switching device, and one end of the second copper foil is connected to a second switching device, It is characterized in that The first copper foil is the wiring copper foil according to any one of claims 1 to 7, so that the turning on and off of the first switching device is synchronized with the turning on and off of the second switching device.

9. The circuit board according to claim 8, It is characterized in that The raised portion of the first copper foil is adjacent to the first switching device; The second copper foil is in a long strip shape.

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