High-voltage-resistant thick-film resistor

Abstract

The utility model discloses a high-voltage-resistant thick-film resistor which is characterized by comprising two resistor repairing grooves arranged on a resistor body, and the two resistor repairing grooves are arranged on the same side of the resistor body; the resistor body is provided with two resistor repairing grooves, each resistor repairing groove is of an L-shaped structure, the two resistor repairing grooves are oppositely arranged, each resistor repairing groove comprises a first groove and a second groove which are communicated with each other, one end of each first groove is communicated with the side edge of the resistor body in the width direction, and the other end of each first groove is arranged in the resistor body; one end of the second groove is connected with the end part of the first groove arranged in the resistor body, the other end of the second groove extends towards the other resistor repairing groove, and the second groove extends along the length direction of the resistor body. According to the utility model, the high-voltage resistance of the resistor is effectively improved.

Description

Technical Field

[0001] This utility model relates to a resistor, and more particularly to a high voltage resistant thick film resistor. Background Technology

[0002] To ensure the resistance value meets a preset target value, the resistor undergoes a repair process. Common laser repair methods for thick-film resistors mainly include the following four types: L-knife (such as...) Figure 1a As shown), double blades (as shown) Figure 1b As shown), single blade + L-blade (as shown) Figure 1c As shown), Z-knife (as shown) Figure 1d As shown in the diagram, the L-blade initially performs a single cut, followed by a second cut along the length of the resistor. This method is faster and suitable for medium resistance with a precision of 1% to 5%. The double-blade method offers better accuracy (SD) than the single-blade + L-blade method, but is slower and suitable for high and low resistance with a precision of 1%. The single-blade + L-blade method is slower but offers high precision and good SD after trimming. The Z-blade method is suitable for resistors with large resistance variations, but is slower and suitable for Power type and special type resistors. All four methods include the resistor element 103 and the trimming groove 104. The process is mature and can meet the requirements of different resistance ranges, precision, and power. During laser cutting, the laser irradiates the surface of the resistor, instantly heating the material and causing it to rapidly vaporize, melt, or reach its ignition point. During this process, due to the restriction of the molten material by the unheated parts and the rearrangement of molecules after the material cools, microcracks will appear at the edge of the laser cutting edge. Furthermore, the laser operation time is the longest at the end of the laser cutting edge, absorbing the most energy and generating the most microcracks. When current passes through the concentrated area of ​​microcracks, it generates a large amount of heat. If the current is too high, it can even burn out the resistor and cause an open circuit. The effect of microcracks on resistance varies depending on the type of cutting blade. Figure 2a As shown, the microcracks 101 produced by the "I"-shaped blade (similar to double blades and Z-blades) are perpendicular to the current flow direction 102, cutting into the area with the smallest current flow area, such as... Figure 2b As shown, the microcracks 101 generated by the "L"-shaped cutter are parallel to the current flow direction 102, and the current flow density is extremely low in some crack areas. Therefore, the "L"-shaped cutter is generally more conducive to the high voltage withstand performance of resistors. However, as customers' requirements for the voltage withstand capability of thick film resistors become increasingly stringent, conventional laser repair methods are insufficient. Therefore, improving the high voltage withstand capability of resistors is a direction that those skilled in the art need to explore. Summary of the Invention

[0003] The purpose of this invention is to provide a high-voltage resistant thick-film resistor. By using this structure, the high-voltage resistance of the resistor can be effectively improved.

[0004] The utility model provides a high pressure thick film resistor, including two resistance trimming groove of setting on resistance body, two resistance trimming groove set in the same side of resistance body,

[0005] Resistance trimming groove is L type structure, two resistance trimming groove opposite setting, resistance trimming groove includes first groove and second groove who intercommunication, one end of first groove with the side of resistance body's width direction intercommunication, the other end of first groove sets up in resistance body inside,

[0006] The end of second groove is connected with the end of first groove set up in resistance body inside, the other end of second groove extends to the direction of another resistance trimming groove, and second groove extends along the length direction of resistance body.

[0007] In the above technical scheme, the first groove is parallel to the side of the length direction of the resistance body, the second groove is parallel to the side of the width direction of the resistance body, and the first groove is perpendicular to the second groove.

[0008] In the above technical scheme, the two resistance trimming grooves are a first resistance trimming groove and a second resistance trimming groove, and the first resistance trimming groove and the second resistance trimming groove have a horizontal spacing.

[0009] In the above technical scheme, the length of the first groove of the first resistance trimming groove is less than the length of the first groove of the second resistance trimming groove, and the length of the second groove of the first resistance trimming groove is less than the length of the second groove of the second resistance trimming groove.

[0010] In the above technical scheme, the length of the first groove of the first resistance trimming groove is less than 1 / 4 of the width of the resistance body, and the length of the first groove of the second resistance trimming groove is less than 1 / 3 of the width of the resistance body.

[0011] The length of the second groove of the first resistance trimming groove is less than 1 / 8 of the length of the resistance body, and the length of the second groove of the second resistance trimming groove is less than 1 / 4 of the length of the resistance body.

[0012] In the above technical scheme, the first groove of the first resistance trimming groove and the first groove of the second resistance trimming groove have a horizontal spacing, and the second groove of the first resistance trimming groove and the second groove of the second resistance trimming groove have a vertical spacing.

[0013] In the technical scheme, the transverse interval between the first slot of the first trimming resistor groove and the first slot of the second trimming resistor groove is 1 / 2-2 / 3 of the length of the resistor body; the transverse interval between the second slot of the first trimming resistor groove and the second slot of the second trimming resistor groove is 1 / 8-1 / 4 of the length of the resistor body; and the vertical interval between the second slot of the first trimming resistor groove and the second slot of the second trimming resistor groove is 1 / 10-1 / 8 of the width of the resistor body.

[0014] In the technical scheme, the first trimming resistor groove is arranged on the left side of the second trimming resistor groove, the front ends of the first slot of the first trimming resistor groove and the first slot of the second trimming resistor groove are communicated with the front end face of the resistor body, the left end of the second slot of the first trimming resistor groove is connected with the rear end of the first slot of the first trimming resistor groove, and the right end of the second slot of the second trimming resistor groove is connected with the rear end of the first slot of the second trimming resistor groove.

[0015] The right end of the second slot of the first trimming resistor groove and the left end of the second slot of the second trimming resistor groove have a transverse interval.

[0016] In the technical scheme, the two ends of the resistor body in the length direction are respectively provided with front electrodes, and the two trimming resistor grooves are respectively arranged between the front electrodes on the two sides.

[0017] Compared with the prior art, the utility model has the following advantages due to the technical scheme:

[0018] 1. In the utility model, two L-shaped trimming resistor grooves are arranged on the same side of the resistor body, and the two L-shaped trimming resistor grooves are oppositely arranged, which increases the current flow area, makes the corrected resistance value more accurate, the SD value smaller, and the high-voltage resistance performance stronger.

[0019] 2. In the utility model, the sizes of the two trimming resistor grooves are different, the size of one trimming resistor groove is smaller, and the ends of the two trimming resistor grooves do not cross, which can effectively increase the current flow area and achieve the purposes of fine trimming of resistance value and increase of yield. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1a It is a structure schematic view of L-knife trimming resistance in the background art;

[0021] Figure 1b It is a structure schematic view of double-knife trimming resistance in the background art;

[0022] Figure 1c It is a structure schematic view of single-knife and L-knife combined trimming resistance in the background art;

[0023] Figure 1d It is a structure schematic view of Z-knife trimming resistance in the background art;

[0024] Figure 2ais a structural schematic view of micro-cracks and current flow direction after I-shaped knife type trimming in the background art;

[0025] Figure 2b is a structural schematic view of micro-cracks and current flow direction after L-shaped knife type trimming in the background art;

[0026] Figure 3 is a structural schematic view in the embodiment one of the utility model;

[0027] Figure 4 is a structural schematic view of current flow and trimming groove in the embodiment one of the utility model;

[0028] Figure 5 is a structural schematic view of current flow and trimming groove in the comparative example.

[0029] Wherein: 1, resistance body;2, first slot;3, second slot;4, front electrode;5, first trimming groove;6, second trimming groove;7, micro-crack;8, current flow;101, micro-crack;102, current flow direction;103, resistance body;104, trimming groove. Specific implementation

[0030] The utility model is further described below in combination with the drawings and embodiments:

[0031] Embodiment one: refer to Figure 3 As shown in the figure, a high-voltage thick film resistor includes two trimming grooves arranged on the resistance body 1, and the two trimming grooves are arranged on the same side of the resistance body 1.

[0032] The trimming groove is of L-shaped structure, and the two trimming grooves are oppositely arranged, the trimming groove includes a first slot 2 and a second slot 3 which are in communication with each other, one end of the first slot 2 is in communication with the side of the resistance body 1 in the width direction, and the other end of the first slot 2 is arranged inside the resistance body 1.

[0033] One end of the second slot 3 is connected with the end of the first slot 2 arranged inside the resistance body 1, the other end of the second slot 3 extends in the direction of the other trimming groove, and the second slot 3 extends along the length direction of the resistance body 1.

[0034] In the utility model, two L-shaped trimming grooves are adopted and oppositely arranged, the size of each L-shaped trimming groove is smaller than that of the original L-shaped slot, the original advantages of the L-shaped knife are utilized, and the cutting is performed by two L-shaped knives, the length of each knife is shortened, the current flow area is effectively increased, the second knife can also have the effect of fine trimming, the trimming precision is higher, and the SD is smaller.

[0035] The utility model discloses a resistance body 1 length direction's both ends are equipped with the front electrode 4 respectively, and two the resistance slot is arranged between two side front electrode 4 respectively.

[0036] When the resistance slot is processed, one of the resistance slots is processed first, and then the other resistance slot is processed. When the resistance slot is processed, the first slot is quickly processed from the side of the resistance body in the width direction, and then the second slot is processed from the first end extending into the resistance body. In this way, the length of the first slot and the second slot of the two resistance slots is less than the length of the single L-shaped resistance slot of the prior art. This can shorten the length and width of the resistance slot, thereby increasing the current flow area and effectively increasing the yield and high pressure resistance. Furthermore, the cutting range of the first knife (the first resistance slot, which is the second resistance slot in this embodiment) is -10% of the resistance value, and the second knife (the second resistance slot, which is the first resistance slot in this embodiment) cuts to the resistance value. The second knife serves the purpose of fine trimming, further increasing the yield and improving the high pressure resistance. In addition, the L-shaped resistance slot has high trimming efficiency. In this embodiment, the second resistance slot is processed first, and then the first resistance slot is processed, i.e. the larger size resistance slot is processed first for rough trimming, and then the smaller size resistance slot is processed for fine trimming, thereby improving the trimming effect.

[0037] Referring to Figure 3 As shown in the figure, the first slot 2 is parallel to the side of the resistance body 1 in the length direction, the second slot 3 is parallel to the side of the resistance body 1 in the width direction, and the first slot 2 is perpendicular to the second slot 3.

[0038] For example, the current flow direction is from left to right or from right to left, and the two front electrodes are arranged at the left and right ends of the resistance body. The first slot is parallel to the left and right sides of the resistance body, and the second slot is parallel to the front and back sides of the resistance body.

[0039] Referring to Figure 3 As shown in the figure, the two resistance slots are a first resistance slot 5 and a second resistance slot 6, and the first resistance slot 5 and the second resistance slot 6 have a transverse spacing.

[0040] The first resistance slot and the second resistance slot have a transverse spacing, which can prevent the two resistance slots from intersecting. After one resistance slot is cut, the other resistance slot can be cut smoothly.

[0041] Referring to Figure 3As shown, the length of the first slot 2 of the first trimming groove 5 is less than the length of the first slot 2 of the second trimming groove 6, and the length of the second slot 3 of the first trimming groove 5 is less than the length of the second slot 3 of the second trimming groove 6.

[0042] The first trimming groove 5 is arranged on the left side of the second trimming groove 6, the front ends of the first slot 2 of the first trimming groove 5 and the first slot 2 of the second trimming groove 6 are communicated with the front end surface of the resistor body 1, the left end of the second slot 3 of the first trimming groove 5 is connected with the rear end of the first slot 2 of the first trimming groove 5, and the right end of the second slot 3 of the second trimming groove 6 is connected with the rear end of the first slot 2 of the second trimming groove 6.

[0043] The right end of the second slot of the first trimming groove and the left end of the second slot of the second trimming groove have a transverse spacing. The right end of the second slot of the first trimming groove is arranged on the left front side of the second slot of the second trimming groove.

[0044] The first slot of the first trimming groove and the first slot of the second trimming groove have a transverse spacing, and the second slot of the first trimming groove and the second slot of the second trimming groove have a vertical spacing.

[0045] In the embodiment, the lengths of the first slot and the second slot of the two trimming grooves are not the same, and the lengths of the first slot and the second slot of the first trimming groove are respectively less than the lengths of the first slot and the second slot of the second trimming groove, and the two trimming grooves also have a transverse spacing, the right end of the second slot of the first trimming groove and the left end of the second slot of the second trimming groove have a transverse spacing, so that the ends of the two trimming grooves do not intersect (the end of the first trimming groove is the right end of its second slot, and the end of the second trimming groove is the left end of its second slot), the two ends do not intersect, that is, the ends of the double knives (two trimming grooves) with the maximum laser cutting range do not have an intersection, which can prevent the mutual interference of the two trimming grooves from affecting the normal passage of the current, effectively increase the current flow area, and improve the high-voltage resistance of the resistor body. After the first trimming groove is cut, the normal cutting of the second trimming groove is not affected, effectively ensuring the product qualification rate and the good product rate.

[0046] Referring to Figure 3 As shown, the length of the first slot of the first trimming groove is less than 1 / 4 of the width of the resistor body, and the length of the first slot of the second trimming groove is less than 1 / 3 of the width of the resistor body.

[0047] The length of the second slot of the first trimming groove is less than 1 / 8 of the length of the resistor body, and the length of the second slot of the second trimming groove is less than 1 / 4 of the length of the resistor body.

[0048] The transverse spacing value between the first slot of the first trimming resistor groove and the first slot of the second trimming resistor groove is 1 / 2-2 / 3 of the length of the resistor body; the transverse spacing value between the right end of the second slot of the first trimming resistor groove and the left end of the second slot of the second trimming resistor groove is 1 / 8-1 / 4 of the length of the resistor body; and the vertical spacing value between the second slot of the first trimming resistor groove and the second slot of the second trimming resistor groove is 1 / 10-1 / 8 of the width of the resistor body.

[0049] In the prior art, the length of the L-shaped trimming resistor groove in the length direction is about 1 / 2 of the length of the resistor body, and the length in the width direction is about 1 / 2 of the width of the resistor. In this way, when the current passes through the L-shaped trimming resistor groove, the current flow area is affected due to the wide width and long length. Therefore, in the present embodiment, two trimming resistor grooves with small length and width are used, and the combination of the two L-shaped trimming resistor grooves shortens the length of the trimming resistor groove in the trimming process, effectively increases the current flow area, and sets two trimming resistor grooves, that is, performs secondary trimming, which also plays a role in fine trimming of the resistance value, effectively increasing the yield and pass rate. In addition, the length and width of the two trimming resistor grooves are set with a spacing, so that after the processing of one trimming resistor groove, the laser processing of the other trimming resistor groove is not affected. Moreover, the length and width of one trimming resistor groove are smaller than those of the other trimming resistor groove, which can prevent the intersection of the two lasers in the laser cutting trimming process, and ensure that the first laser is cut out smoothly.

[0050] Moreover, the two trimming resistor grooves are arranged on the same side of the resistor body in the width direction, and the two trimming resistor grooves occupy the width of the resistor body in the width direction, which has the smallest effect on the current flow area. In addition, only one trimming device needs to be arranged on one side during production, and the space occupation of the assembly line is smaller, and the cost is lower.

[0051] In the short time load (STOL) test, the high-voltage resistance performance of the Z knife and the double L knife (two L-shaped trimming resistor grooves arranged on the same side) is compared, and the test is carried out under the condition of the maximum load voltage, as shown in the following table:

[0052]

[0053]

[0054] As shown in the above table, the resistance value change rate of the double L knife cutting is much smaller than that of the Z knife cutting, and the high-voltage resistance performance is better.

[0055] Referring to Figure 4 Fig. 7 shows a structure schematic view of the micro cracks 7 and the current flow 8 after the double L knife cutting arranged on one side;

[0056] Referring to Figure 5 Fig. 8 shows a structure schematic view of the micro cracks 7 and the current flow 8 after the double L knife cutting arranged on one side; Figure 5As a comparative example, a structural diagram of a micro crack at a current flow crossing position after a double L knife cut is provided.

[0057] From Figure 4 , Figure 5 It can be seen that the current density at the knife receiving position of the unilateral double L knife cut is lower, and the intersection position of the micro crack and the current flow crossing position is less, which is better than the double L knife cut structure on both sides in terms of electrical performance.

[0058] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0059] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, such as, the two are connected in a mechanical abutting or abutting manner through abutting, touching and the like, or the two are directly hung or hung through an intermediate medium, or the two are connected in a hanging manner, or the two are connected in a hanging manner. The internal communication of two elements or the interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A high voltage thick film resistor characterized by: Two resistance trimming grooves are arranged on the resistor body, and the two resistance trimming grooves are arranged on the same side of the resistor body. The resistance trimming groove is in L-shaped structure, and the two resistance trimming grooves are oppositely arranged. The resistance trimming groove comprises a first groove and a second groove which are communicated with each other.

2. The high voltage thick film resistor of claim 1 wherein: One end of the first groove is communicated with the side of the resistor body in the width direction, and the other end of the first groove is arranged inside the resistor body.

3. The high voltage thick film resistor of claim 1 wherein: One end of the second groove is connected with the end of the first groove arranged inside the resistor body, and the other end of the second groove extends towards the direction of the other resistance trimming groove.

4. The high voltage thick film resistor of claim 3 wherein: The second groove extends along the length direction of the resistor body.

5. The high voltage thick film resistor of claim 4 wherein: The first groove is arranged parallel to the side of the resistor body in the length direction, and the second groove is arranged parallel to the side of the resistor body in the width direction. The first groove is arranged perpendicular to the second groove.

6. The high voltage thick film resistor of claim 4 wherein: The two resistance trimming grooves are a first resistance trimming groove and a second resistance trimming groove.

7. The high voltage thick film resistor of claim 6 wherein: The length of the first groove of the first resistance trimming groove is smaller than the length of the first groove of the second resistance trimming groove.

8. The high voltage thick film resistor of claim 3 wherein: The length of the first groove of the first resistance trimming groove is smaller than 1 / 4 of the width of the resistor body, and the length of the first groove of the second resistance trimming groove is smaller than 1 / 3 of the width of the resistor body. The length of the second groove of the first resistance trimming groove is smaller than 1 / 8 of the length of the resistor body, and the length of the second groove of the second resistance trimming groove is smaller than 1 / 4 of the length of the resistor body.

9. The high voltage thick film resistor of claim 1 wherein: The first groove of the first resistance trimming groove and the first groove of the second resistance trimming groove have a horizontal spacing, and the second groove of the first resistance trimming groove and the second groove of the second resistance trimming groove have a vertical spacing. The horizontal spacing between the first groove of the first resistance trimming groove and the first groove of the second resistance trimming groove is 1 / 2-2 / 3 of the length of the resistor body. The horizontal spacing between the second groove of the first resistance trimming groove and the second groove of the second resistance trimming groove is 1 / 8-1 / 4 of the length of the resistor body. The vertical spacing between the second groove of the first resistance trimming groove and the second groove of the second resistance trimming groove is 1 / 10-1 / 8 of the width of the resistor body. The first resistance trimming groove is arranged on the left side of the second resistance trimming groove. The front ends of the first groove of the first resistance trimming groove and the first groove of the second resistance trimming groove are communicated with the front end surface of the resistor body. The left end of the second groove of the first resistance trimming groove is connected with the rear end of the first groove of the first resistance trimming groove. The right end of the second groove of the second resistance trimming groove is connected with the rear end of the first groove of the second resistance trimming groove. The two ends of the resistor body in the length direction are respectively provided with front electrodes, and the two resistance trimming grooves are arranged between the two front electrodes.

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