CN115633443A - Take cross cutting circuit of protect function - Google Patents

Abstract

The invention discloses a die cutting circuit with a safety function, which belongs to the technical field of flexible circuit boards and comprises: the system comprises a first main line, a second main line, a plurality of safety lines and a plurality of weak lines; a plurality of groups of fuse circuits and weak circuits which are connected with each other are arranged between the first main circuit and the second main circuit which are arranged in opposite directions or in the same direction; when the current in the circuit is higher than the safety threshold value due to the fault of the external circuit, the multiple groups of weak lines can play the roles of dispersing energy and reducing the total voltage; thereby avoiding the problem of arcing or fire in the circuit. Therefore, the invention solves the technical problem of insufficient safety of the flexible circuit board in the prior art.

Description

Take cross cutting circuit of protect function

Technical Field

The invention relates to the technical field of flexible circuit boards, in particular to a die cutting circuit with a safety function.

Background

A Flexible Circuit board, i.e., a Flexible Printed Circuit; often referred to as FPC for short. The FPC is a printed circuit board which is mainly made of polyimide or polyester film as a base material and has higher reliability and better flexibility. The printed circuit board has the characteristics of high wiring density, light weight, thin thickness and good bending property, and is widely applied to the field of modern electronic technology. The existing flexible circuit board is generally divided into a single-sided board and a double-sided board, and a power line and a functional circuit are usually disposed on a wiring surface, and the functional circuit usually includes a control circuit, a detection circuit or a communication circuit. A common flexible circuit generally includes a flexible circuit board and a power supply circuit disposed on the flexible circuit board, wherein the power supply circuit is used for supplying driving power to the whole circuit board. Under the driving action of the power provided by the power circuit, each functional circuit can realize corresponding functions. However, because the current in the power supply circuit is high, in order to enable each circuit device in the circuit board to work normally; the wiring width of the power circuit on the wiring surface is generally wide, so that normal transmission of large-current signals in the power circuit can be ensured. Because the area of the circuit board occupied by the power supply circuit is large, and the wiring density of the circuit board is constant, because the wiring density is related to the wiring process technology, the area of the circuit board can only be increased for wiring the functional circuit, so that the aim of realizing large-scale and super-large-scale integration is not facilitated, the area of the flexible circuit board cannot be reduced, and the flexible circuit board is not beneficial to popularization and use.

Based on this, chinese patent CN106604524A discloses a flexible circuit board, which includes one or two wiring planes, and a power line disposed on the wiring planes, wherein the power line includes N conductor sets, and N is greater than 0. Wherein the conductor set is formed of a plurality of conductive layers stacked in a thickness direction of the flexible circuit board. Through setting the power cord to the form of a plurality of conductor groups and a plurality of conducting layer, when guaranteeing that electric current normal transmission in the power cord, can effectively reduce the area occupied of power cord on the wiring face to can save more wiring space and be used for arranging more circuits, improve flexible circuit board's integrated level.

However, the above-described disclosed flexible circuit board has a technical problem of insufficient safety. Specifically, the thickness of the conductive layer of each circuit on the existing circuit board is constant, and it should be understood by those skilled in the art that, since the thickness of the conductive layer is set to be constant, in order to implement transmission of a large current signal, only the width of the conductive layer is set to be wider, so that normal transmission of the large current signal can be ensured. Because the magnitude of the current is related to the cross-sectional area of the conductor, when a large current needs to be transmitted, for example, a power circuit on a circuit board, the current signal transmitted is generally large, which results in that the power line occupies a large wiring area of the circuit board, which is not favorable for achieving the purpose of high integration level. The technical scheme disclosed by the prior art is just to set the power line into the form of a plurality of conductor groups and a plurality of conducting layers, so that the occupied area of the power line on the wiring surface can be effectively reduced while the normal transmission of current in the power line is ensured, more wiring space can be saved for arranging more circuits, and the integration level of the flexible circuit board is improved. However, this flexible circuit board structure is not provided with a fusing structure, and when a circuit fails or is abnormal, the temperature of the circuit board rises with the rise of current; excessive temperatures tend to damage the device. Furthermore, the current rise in the circuit may damage some important or valuable components in the circuit, and may burn the circuit and even cause a fire.

Disclosure of Invention

Therefore, it is necessary to provide a die-cut circuit with a safety function to solve the technical problem of insufficient safety of the flexible circuit board in the prior art.

A die-cut line with a safety function, comprising: the system comprises a first main line, a second main line, a plurality of safety lines and a plurality of weak lines; the first main line and the second main line are arranged in opposite directions or in the same direction; the plurality of fuse circuits and the plurality of weak circuits are uniformly arranged between the first main circuit and the second main circuit; the connection sides of the first main line and the second main line are respectively electrically connected with one safety line; two ends of each weak line are electrically connected with one safety line respectively; the first main line and the second main line are electrically connected with the weak line through the fuse line; and after a preset current value flows between the first main line and the second main line, the weak line is fused to break the first main line and the second main line.

Specifically, the fuse line and the weak line are made of copper or aluminum.

Further, the line width of the fuse line is 0.10mm to 0.50mm; the line width of the weak line is 0.05mm to 0.20mm; .

Furthermore, the line width of the fuse circuit is 0.2mm to 0.4mm; the line width of the weak line is 0.10mm to 0.15mm.

Furthermore, when the material of the fuse wire and the weak wire is copper, the material thickness of the fuse wire and the weak wire is 0.01mm to 0.05mm; when the fuse line and the weak line are made of aluminum, the thickness of the fuse line and the weak line can be 0.015mm to 0.070mm.

Furthermore, when the material of the fuse wire and the weak wire is copper, the material thickness of the fuse wire and the weak wire is 0.02mm to 0.04mm; when the fuse wire and the weak wire are made of aluminum, the thickness of the fuse wire and the weak wire is 0.03mm to 0.05 mm.

Furthermore, the distance between every two weak lines arranged between the first main line and the second main line is 1mm to 10mm.

Furthermore, the distance between every two weak lines arranged between the first main line and the second main line is 3mm to 5mm.

Furthermore, the fuse line and the weak line arranged between the first main line and the second main line are connected with each other to form a structure of a curve, an arc line or a structure of a curve and a straight line.

In summary, the die-cutting circuit with the safety function of the invention is respectively provided with a first main circuit, a second main circuit, a plurality of safety circuits and a plurality of weak circuits; a plurality of groups of fuse lines and weak lines which are connected with each other are arranged between the first main line and the second main line which are arranged in the same direction or in the same direction; when the current in the circuit is higher than the safety threshold value due to the fault of the external circuit, the multiple groups of weak lines can play the roles of dispersing energy and reducing the total voltage; thereby avoiding the problem of arcing or fire in the circuit. Therefore, the die cutting circuit with the safety function solves the technical problem of insufficient safety of the flexible circuit board in the prior art.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a die-cut line with a safety function according to the present invention;

fig. 2 is a schematic structural diagram of another embodiment of a die-cut line with a safety function according to the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Referring to fig. 1, the present invention relates to a die-cutting circuit with safety function, which includes: the system comprises a first main line 1, a second main line 2, a plurality of fuse lines 3 and a plurality of weak lines 4; the first main line 1 and the second main line 2 are arranged in the same direction or in the same direction; the plurality of fuse lines 3 and the plurality of weak lines 4 are uniformly arranged between the first main line 1 and the second main line 2; the opposite sides of the first main line 1 and the second main line 2 are respectively electrically connected with one fuse line 3; two ends of each weak line 4 are electrically connected with one safety line 3 respectively; the first main line 1 and the second main line 2 are electrically connected with the weak line 4 through the fuse line 3; when a predetermined current value flows between the first main line 1 and the second main line 2, the weak line 4 melts to open the first main line 1 and the second main line 2.

Specifically, the first main line 1 and the second main line 2 arranged on the die-cutting line with the safety function are respectively connecting parts of different functional lines in an external flexible circuit; for example, it can be applied to a connection region between a power supply line and a functional line. More specifically, the first main line 1 may serve as a connection site of a power supply line; the second main line 2 may serve as a connection site for a functional line; the fuse circuits 3 and the weak circuits 4 are alternately connected to realize electrical conduction connection. Therefore, when the current in a preset safety range passes between the first main line 1 and the second main line 2, the first main line and the second main line can be normally connected; when the current passing between the first main line 1 and the second main line 2 is greater than a preset safety threshold, each weak line 4 is fused to break the two lines. More specifically, when the line of weakness 4 is energized, the electrical energy is converted into heat due to its own electrical resistance, causing the melt formed by the line of weakness 4 itself to heat up. Meanwhile, the heat generated by the current is radiated to the surrounding environment through the melt, and the heat is dissipated through heat convection, heat conduction and other modes. Therefore, when the allowable working current passes through the weak line 4, the self-emitted heat and the generated heat are balanced, and the heat is not accumulated in the self-emitted heat so that the temperature of the body of the weak line is increased; therefore, the weak wire 4 does not reach its predetermined melting point and is not fused. When the current passing through the weakened line 4 reaches a preset value, the amount of heat converted by the electric energy in the weakened line increases gradually. When the heat dissipation rate is lower than the heat generation rate, the heat is gradually accumulated on the weak wire 4, so that the temperature in the weak wire 4 is increased. Furthermore, when the temperature reaches the melting point of the weakened line 4, it starts to melt and continues to absorb heat to further melt and become liquid; subsequently, the temperature on the weakening line 4 rises further to the vaporization point and an arc is formed. The electric arc is a gas free discharge phenomenon, the strength of the electric arc is related to the voltage of a circuit, and the electric arc is stronger when the voltage is higher; in addition, the intensity of the arc is also related to the current in the circuit, with a higher current the stronger the arc.

Furthermore, in the die-cutting circuit with the safety function, a plurality of first main circuits 1 and a plurality of second main circuits 2 are connected only through the safety circuits 3; when the current rises to turn off the switch, the energy of the switch is too large, which easily causes the phenomenon of arc discharge and even causes the condition of fire. Therefore, the first main line 1 and the second main line 2 are alternately connected to each other via the fuse line 3 and the weak line 4; and the opposite sides of the first main line 1 and the second main line 2 are respectively connected with one safety line 3; two ends of each weak line 4 are respectively connected with one safety line 3; therefore, the condition that only one melting point is arranged in the line can be avoided; further avoiding the problems of arc discharge and fire caused by concentrated energy or overlarge energy when the circuit is fused.

Further, the material of the fuse line 3 and the weak line 4 may be a metal material with good conductive performance, such as copper, aluminum, silver, or gold. The preferable material of the fuse line 3 and the weak line 4 is copper or aluminum. The line width of the fuse line 3 can be 0.1mm to 0.5 mm; the preferred size is 0.2mm to 0.4mm. The line width of the weak line 4 can be 0.05mm to 0.20mm; the preferred size is 0.10mm to 0.15mm.

Further, when the material of the fuse line 3 and the weak line 4 is copper, the material thickness of the fuse line and the weak line can be 0.01mm to 0.05mm; the preferable thickness of the material is 0.02mm to 0.04mm. When the fuse wire 3 and the weak wire 4 are made of aluminum, the material thickness of the fuse wire and the weak wire can be 0.015-0.070 mm; the preferable thickness of the two materials is between 0.03mm and 0.05 mm.

Further, the number of the weak lines 4 provided between the first main line 1 and the second main line 2 is 2 to 15; the preferred amount is 4 to 8.

Further, the distance between every two weak lines 4 arranged between the first main line 1 and the second main line 2 is 1mm to 10mm; the preferred spacing is 3mm to 5mm.

Specifically, please refer back to FIG. 1; the embodiment of the die cutting line with the safety function provided by the invention specifically comprises the following steps: the first main line 1 is arranged opposite to the second main line 2; six groups of the safety lines 3 and five groups of the weak lines 4 are uniformly arranged between the two groups of the safety lines. The five groups of weak lines 4 are respectively connected with one group of safety lines 3 at two sides; further, the six groups of fuse lines 3 connect five groups of weak lines 4 in series between the first main line 1 and the second main line 2 in this order. Therefore, when the external line fails to cause current abnormality, five groups of the weak lines 4 arranged between the first main line 1 and the second main line 2 can be fused due to simultaneous overload; thereby avoiding the condition of arc discharge or fire caused by only a single circuit fusing point.

Further, in the structure of the die-cutting line with the safety function, the safety line 3 and the weak line 4 are not limited to a straight line structure; which may be connected to each other to form a curve, arc or arc plus straight line configuration. Specifically, please continue to refer to fig. 2; fig. 2 shows another embodiment of the die-cut line with a safety function according to the present invention. Specifically, in this embodiment, the first main line 1 and the second main line 2 are arranged to face each other while being staggered from each other; and a part of the fuse wire 3 and the weak wire 4 arranged therebetween are bent into an arc line to connect the first main wire 1 and the second main wire 2 which are staggered; so that the fuse line 3 and the weak line 4 are connected to form an arc-line structure.

In summary, the die-cutting circuit with the safety function of the invention is respectively provided with a first main circuit 1, a second main circuit 2, a plurality of safety circuits 3 and a plurality of weak circuits 4; moreover, a plurality of groups of the fuse lines 3 and the weak lines 4 which are connected with each other are arranged between the first main line 1 and the second main line 2 which are arranged in opposite directions or in the same direction; when the current in the circuit is higher than the safety threshold value due to the fault of the external circuit, the multiple groups of weak lines 4 can play the roles of dispersing energy and reducing the total voltage; thereby avoiding the problem of arcing or fire in the circuit. Therefore, the die cutting circuit with the safety function solves the technical problem of insufficient safety of the flexible circuit board in the prior art.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. The utility model provides a take cross cutting circuit of insurance function which characterized in that, it includes: the circuit comprises a first main circuit, a second main circuit, a plurality of safety circuits and a plurality of weak circuits; the first main line and the second main line are arranged in opposite directions or in the same direction; the plurality of safety lines and the plurality of weak lines are uniformly arranged between the first main line and the second main line; the connection sides of the first main line and the second main line are respectively electrically connected with one fuse line; two ends of each weak line are electrically connected with one safety line respectively; the first main line and the second main line are electrically connected with the weak line through the fuse line; and after a preset current value flows between the first main line and the second main line, the weak line is fused to break the first main line and the second main line.

2. The die-cut line with insurance function of claim 1, wherein: the fuse line and the weak line are made of copper or aluminum.

3. The die-cut line with safety function of claim 2, wherein: the line width of the fuse circuit is 0.10mm to 0.50mm; the line width of the weak line is 0.05mm to 0.20mm; .

4. The die-cut line with insurance function of claim 3, wherein: the line width of the fuse circuit is 0.2mm to 0.4mm; the line width of the weak line is 0.10mm to 0.15mm.

5. The die-cut line with insurance function of claim 4, wherein: when the fuse circuit and the weak circuit are made of copper, the thickness of the fuse circuit and the weak circuit is 0.01 mm-0.05 mm; when the fuse line and the weak line are made of aluminum, the material thickness of the fuse line and the weak line may be 0.015mm to 0.070mm.

6. The die-cut line with insurance function of claim 5, wherein: when the fuse circuit and the weak circuit are made of copper, the thickness of the fuse circuit and the weak circuit is 0.02mm to 0.04mm; when the fuse line and the weak line are made of aluminum, the thickness of the fuse line and the weak line is 0.03mm to 0.05 mm.

7. The die-cut line with insurance function of claim 1, wherein: the distance between every two weak lines arranged between the first main line and the second main line is 1mm to 10mm.

8. The die-cut line with insurance function of claim 7, wherein: and the distance between every two weak lines arranged between the first main line and the second main line is 3mm to 5mm.

9. The die-cut line with safety function as claimed in claim 1, wherein: the fuse line and the weak line arranged between the first main line and the second main line are connected with each other to form a structure of a curve, an arc line or a structure of a curved line and a straight line.

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