Transformer framework and pin arrangement method for high-voltage electrically-driven converter

Abstract

The invention discloses a transformer framework for a high-voltage electrically-driven converter and a pin arrangement method. The transformer framework comprises a framework body formed by sequentially connecting a primary side base, a transversely-extending winding reel and a secondary side base. A plurality of pairs of pins are arranged on the primary side base and the secondary side base; the plurality of pairs of pins on the secondary side base are distributed in parallel in at least two rows; a first coil, a second coil and a third coil are arranged on the secondary side base; the minimum linear distance between the pin of the first coil and the pin of the third coil and the minimum linear distance between the pin of the second coil and the pin of the third coil are all electric gap values d; the distance between the pins is p, the minimum distance between the pin of the first coil and the pin of the second coil is c, and the distance between the pin of the third coil and a straight line formed by the pin of the first coil and the pin of the second coil is b. The technical problem that in the prior art, traditional pins are linearly arranged in a single row, and consequently transformer packaging is too large is solved, and the technical effect that the transformer packaging size for enhancing insulation is small is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer skeleton, in particular to a transformer skeleton and pin arrangement method for high-voltage electric drive current transformer. BACKGROUND

[0002] High-frequency transformers have the advantage of small size compared to power-frequency transformers, and have great application demand in various industries such as electric vehicles, new energy, industrial driving, and rail transit. The development trend of electric vehicles in recent years is from a 400V voltage platform to an 800V voltage platform, which puts higher requirements on the insulation and electrical clearance of high-frequency transformers for electric vehicles.

[0003] The skeleton of a high-frequency transformer is one of the core components, and the skeleton of the high-frequency transformer is composed of a primary side base, a winding drum and a secondary side base connected in sequence, the primary side base and the secondary side base are respectively provided with a single row of straightly arranged coil pins, the winding drum usually extends horizontally, the pin connection on the primary side base and the pin connection on the secondary side base both extend vertically along the longitudinal direction of the winding drum, and the horizontal safety distance between the primary and secondary side pins is determined by the skeleton meeting the basic insulation or enhanced insulation requirements.

[0004] In the prior art, two coils are usually arranged in a straight line on the primary side base of the transformer skeleton, and n coils are usually arranged on the secondary side base, the electrical clearance refers to the shortest distance between the pins of two adjacent coils, denoted as d, the pin spacing of each coil is the same and denoted as p, the longitudinal span of the transformer area is (n*p+(n-1)*d), the horizontal span between the primary and secondary side pins in enhanced insulation is denoted as D, and the area of the entire transformer is S=D*(n*p+(n-1)*d).

[0005] For high-frequency transformers that require enhanced insulation, the safety distance between the primary and secondary side pins on the skeleton needs to be increased, i.e., the value of D needs to be increased, which will increase the size of the skeleton, resulting in an excessively large area and packaging size of the transformer, and causing excessive space occupation.

[0006] Therefore, it is necessary to design a transformer skeleton with enhanced insulation and small packaging size. SUMMARY

[0007] The present application provides a transformer skeleton and pin arrangement method for high-voltage electric drive current transformer, which solves the problem of excessively large transformer packaging caused by the single row straight line arrangement of traditional pins.

[0008] The application provides a transformer skeleton for a high-voltage electric drive converter, which comprises a skeleton sequentially connected by a primary side base, a transversely extending winding drum and a secondary side base; a plurality of pairs of pins are arranged on the primary side base and the secondary side base, and a coil is wound on each pair of pins; the connecting direction of each pair of pins is transverse or longitudinal; the plurality of pairs of pins on the secondary side base are arranged in at least two parallel rows; the coil comprises a first coil, a second coil and a third coil arranged on the secondary side base; a pair of pins corresponding to the first coil and a pair of pins corresponding to the second coil are located on a straight line, and a pair of pins corresponding to the third coil is located on another parallel straight line; the minimum straight line distance between the pins corresponding to the first coil, the pins corresponding to the second coil and the pins corresponding to the third coil is an electrical clearance value d; the distance between each pair of pins is p; the minimum distance between the pins corresponding to the first coil and the pins corresponding to the second coil is c, and the value of c is not less than the value of d; the distance between the pins corresponding to the third coil and the straight line formed by the pins corresponding to the first coil and the pins corresponding to the second coil is b, and b2+ (c-p)2 / 4=d2.

[0009] By adopting the technical scheme, the pins on the secondary side base are arranged in multiple rows in parallel, the three coils on the secondary side base are arranged in a specific geometric relationship, that is, one pin of the first coil and one pin of the second coil respectively fall on a circular track with the pin of the third coil as the center and the electrical clearance value d as the radius, the spatial layout of the pins can be significantly optimized under the premise of meeting the electrical clearance requirement, the planar occupation area between the first coil, the second coil and the third coil can be effectively compressed, the overall size of the secondary side base and even the entire transformer skeleton can be reduced, and the problem of excessively large transformer packaging caused by the single-row straight-line arrangement of the traditional pins is overcome.

[0010] Preferably, the connecting lines of the pins corresponding to the first coil, the pins corresponding to the second coil and the pins corresponding to the third coil are longitudinal, and d≤c≤1.5*d.

[0011] By adopting the technical scheme, each group of coils on the secondary side base supplies power to one phase of a three-phase electric drive system, the pins are arranged longitudinally and meet the condition of d≤c≤1.5*d, the size of the secondary side base is adjusted by changing the range of c, the small packaging size of the secondary side base is realized, and the overall packaging size of the transformer is reduced.

[0012] Preferably, the pins corresponding to the third coil are symmetrically arranged about the transversely extending symmetry axis of the winding drum, and the pins corresponding to the first coil and the pins corresponding to the second coil are symmetrically arranged about the transversely extending symmetry axis of the winding drum.

[0013] By adopting the technical scheme, the three groups of coils are symmetrically arranged relative to the transversely extending symmetry axis of the winding drum, the arrangement of the coils is optimized, and the optimal packaging size scheme of the transformer is realized.

[0014] Preferably, the connection of the pins corresponding to the first coil, the pins corresponding to the second coil and the pins corresponding to the third coil is transverse, and 0.5*d≤b≤d.

[0015] By adopting the above technical solution, the pins are arranged transversely and meet the condition of 0.5*d≤b≤d, the size of the secondary side base is adjusted by changing the range of b, the smaller packaging size of the secondary side base is realized, and thus the overall packaging size of the transformer is reduced.

[0016] Preferably, the coil further comprises a fourth coil, and a pair of pins corresponding to the fourth coil is symmetrical to the straight line formed by the pins corresponding to the first coil and the pins corresponding to the second coil with respect to the pins corresponding to the third coil.

[0017] By adopting the above technical solution, three upper pipes of the three-phase electric drive are powered by the three coils on the secondary side base respectively, and the lower pipe of the three-phase electric drive is powered by the fourth group of secondary side coils, so that the transformer skeleton can adapt to more application scenarios.

[0018] Preferably, the pair of pins corresponding to the first coil and the pair of pins corresponding to the second coil are located on the transverse symmetry axis of the bobbin.

[0019] By adopting the above technical solution, the four groups of coils are symmetrically arranged with respect to the transverse symmetry axis of the bobbin, the arrangement scheme of the coils is optimized, and the optimal packaging size scheme of the transformer is realized.

[0020] Preferably, the coil further comprises two groups of primary side coils on the primary side base, and the two groups of primary side coils are distributed longitudinally, and in the longitudinal projection, the minimum distance between the pins on the primary side base and the pins on the secondary side base is D, and D=d or D=2*d.

[0021] By adopting the above technical solution, when the skeleton only needs to meet the basic insulation, the value of D is d, and when the skeleton needs to meet the requirement of reinforced insulation, the value of D is 2*d, the minimum distance between the primary side coils and the secondary side coils is adjusted to make the skeleton meet different insulation requirements, and the optimal packaging size scheme under different insulation requirements is realized.

[0022] Preferably, the connection direction of the two pins corresponding to each primary side coil is the same as the connection direction of the two pins corresponding to the first coil.

[0023] By adopting the above technical solution, the arrangement direction of the pins of the primary side coils is the same as the arrangement direction of the pins of the coils on the secondary side base, the arrangement scheme of the primary side coils is optimized, and the optimal packaging size scheme of the transformer is realized.

[0024] Preferably, in the longitudinal projection, the distance between the two groups of primary side coils is not greater than the maximum distance between the coils on the secondary side base, and the two groups of primary side coils are located between the coils at the longitudinal two ends of the secondary side base.

[0025] By adopting the technical scheme, in the longitudinal direction, the two groups of circular edge coils are located between the coils at the longitudinal two ends on the auxiliary side base, the size of the framework package is further reduced, and thus the overall package size of the transformer is reduced.

[0026] The pin arrangement method for the high-voltage electric drive converter provided in the application comprises the following specific steps: S1, determining the electrical clearance value corresponding to the basic insulation requirement of the transformer as d, the electrical clearance corresponding to the reinforced insulation as D, and selecting the distance between each pair of pins as p; horizontally placing the winding drum of the framework, arranging two groups of primary side coils on the primary side base of the framework, and arranging three or four groups of auxiliary side coils on the auxiliary side base; S2, if three groups of auxiliary side coils are arranged on the auxiliary side base and are denoted as a first coil, a second coil and a third coil, the two pins of each group of auxiliary side coils are arranged longitudinally, the pins of the first coil and the pins of the second coil are located on a straight line, the third coil is located on one side of the straight line and the pin connection line of the third coil is parallel to the straight line, the minimum straight line distance between the two pins of the first coil and the two pins of the second coil and the pin of the third coil is d, the minimum straight line distance between the corresponding pins of the first coil and the corresponding pins of the second coil is denoted as c, the distance between the straight line formed by the first coil and the second coil and the third coil is denoted as b, in the longitudinal projection, the minimum transverse span of the primary side coil and the coil on the auxiliary side base is D, the area of the transformer is S=(c+2*p)*(D+b), and d≤c≤1.5*d; If four groups of auxiliary side coils are arranged on the auxiliary side base and are denoted as a first coil, a second coil, a third coil and a fourth coil, the pins of each group of auxiliary side coils and the pins of the primary side coil are arranged horizontally, the pins of the two groups of primary side coils are located on two parallel longitudinal straight lines, the pins of the first coil and the pins of the second coil are located on a straight line, the third coil is located on one side of the straight line and the pin connection line of the third coil is parallel to the straight line, the minimum straight line distance between the two pins of the first coil, the two pins of the second coil and the pin of the third coil is d, the fourth coil is symmetrically arranged on the other side of the connection line of the first coil and the second coil relative to the third coil, the minimum straight line distance between the corresponding pins of the first coil and the corresponding pins of the second coil is denoted as c, the distance between the straight line formed by the first coil and the second coil and the third coil is denoted as b, in the longitudinal projection, the minimum transverse span of the primary side coil and the coil on the auxiliary side base is D, the area of the transformer is S=2*b*(D+max(2*(d^2-b^2)^0.5,d)+3*p), and 0.5*d≤b≤d.

[0027] By adopting the technical scheme, a systematic pin arrangement design process is provided, engineers are guided to flexibly select the secondary side configuration of three coils or four coils and the corresponding pin direction according to the required electrical clearance value and the selected pin pitch, and to accurately arrange according to specific geometric constraint conditions, and finally to calculate the optimized transformer area, so that the transformer skeleton with the minimum packaging size can be actively and efficiently designed under the condition of meeting the strict high-voltage insulation safety standard, and the operability and target orientation of the design are significantly improved.

[0028] One or more technical solutions provided in the application have at least the following technical effects or advantages: 1. The pins on the secondary side base are arranged in multiple rows in parallel, so that the three coils on the secondary side base are arranged in a specific geometric relationship, that is, one pin of each of the first coil and the second coil respectively falls on a circular track with the pin of the third coil as the center and the electrical clearance value d as the radius, so that the space layout of the pins can be significantly optimized under the premise of meeting the electrical clearance requirement, the planar occupied area between the first coil, the second coil and the third coil is effectively compressed, and the overall size of the secondary side base and even the entire transformer skeleton is reduced, thereby overcoming the problem of excessively large transformer packaging caused by the single-row straight arrangement of traditional pins; 2. The minimum distance between the primary side coil and the secondary side coil is set as twice the electrical clearance value, so that the skeleton meets the requirement of reinforced insulation; 3. In the longitudinal direction, the two groups of circular edge coils are located between the coils at the longitudinal two ends of the secondary side base, so that the packaging size of the skeleton is further reduced, thereby reducing the overall packaging size of the transformer; 4. A systematic pin arrangement design process is provided, engineers are guided to flexibly select the secondary side configuration of three coils or four coils and the corresponding pin direction according to the required electrical clearance value and the selected pin pitch, and to accurately arrange according to specific geometric constraint conditions, and finally to calculate the optimized transformer area, so that the transformer skeleton with the minimum packaging size can be actively and efficiently designed under the condition of meeting the strict high-voltage insulation safety standard, and the operability and target orientation of the design are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1 A schematic view of a longitudinal pin arrangement method for a high-voltage electric drive converter is provided in the application; Figure 2 A schematic diagram of a three-coil secondary side base of a transformer skeleton for a high-voltage electric drive inverter is provided in the present application; Figure 3 A schematic diagram of a transverse pin arrangement method for a high-voltage electric drive inverter is provided in the present application; Figure 4 A schematic diagram of a four-coil secondary side base of a transformer skeleton for a high-voltage electric drive inverter is provided in the present application; Figure 5 A three-coil area and a traditional scheme area comparison schematic diagram of a pin arrangement method for a high-voltage electric drive inverter is provided in the present application; Figure 6 A four-coil area and a traditional scheme area comparison schematic diagram of a pin arrangement method for a high-voltage electric drive inverter is provided in the present application.

[0031] Reference signs: 1, primary side base; 11, primary side coil; 2, winding drum; 3, secondary side base; 31, first coil; 32, second coil; 33, third coil; 34, fourth coil; 4, pin; p, pin spacing; c, spacing between the first coil and the second coil; b, distance between the third coil and the straight line formed by the first coil and the second coil; d, electrical clearance value; D, minimum spacing between the primary side coil and the coil on the secondary side base. DETAILED DESCRIPTION

[0032] The present application provides a transformer skeleton and a pin arrangement method for a high-voltage electric drive inverter, which is used to solve the technical problem of excessive transformer packaging caused by the single-row straight-line arrangement of traditional pins in the prior art.

[0033] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and cannot be used to limit the present application.

[0034] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0035] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does 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 of the present application.

[0036] In the description of the present application, the meaning of one or more is one or more, the meaning of multiple is two or more, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the first, second is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features or the order of the indicated technical features.

[0037] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0038] Example 1

[0039] As Figure 1 , Figure 2 and Figure 5As shown, the embodiment of the present application provides a transformer skeleton and pin 4 arrangement method for a high-voltage electric drive converter, which comprises: a winding drum 2 provided with a primary side base 1 and a secondary side base 3 at two ends, the cuboid-shaped winding drum 2 is arranged transversely, and the cuboid-shaped primary side base 1 and the cuboid-shaped secondary side base 3 are both arranged longitudinally; two groups of coils are arranged on the primary side base 1, and three groups of coils are arranged on the secondary side base 3, the arrangement direction of the five groups of coils is longitudinal arrangement, and the distance between the pins 4 in each group of coils is p, wherein the pin 4 distance p is 1mm, 1.27mm, 2mm, 2.5mm, 2.54mm, 3mm, etc. commonly used distance of the pin arrangement according to the application scene; the four pins 4 on the primary side base 1 are arranged in a longitudinal column and embedded in the primary side skeleton, the pins 4 of the first coil 31 and the second coil 32 on the secondary side base 3 are arranged in a longitudinal column, the first coil 31 is located above the second coil 32, the pins 4 of the third coil 33 are arranged in a longitudinal column and arranged on the right side of the first coil 31 and the second coil 32, and the distance between the third coil 33 and the first coil 31 and the second coil 32 is b; wherein the distance between the lower pin 4 of the first coil 31 and the upper pin 4 of the third coil 33 is an electrical clearance value d, and the distance between the upper pin 4 of the second coil 32 and the lower pin 4 of the third coil 33 is also an electrical clearance value d, the distance between the lower pin 4 of the first coil 31 and the upper pin 4 of the second coil 32 is c, at this time, the longitudinal span of the transformer is c+2*p, and b²+(c-p)² / 4=d²; the distance between the straight line formed by the two groups of primary side coils 11 and the straight line formed by the first coil 31 and the second coil 32 is D, and D=2*d, that is, D is twice the electrical clearance value, so that the skeleton meets the requirement of strengthening insulation; and the area of the whole transformer is S=(c+2*p)* (D+b).

[0040] Figure 4 The change curve of the transformer area S with the change of c and p is shown in the figure, Figure 4 The critical line is the value of c when the transformer area provided by the present application is the same as the traditional transformer area; when the value of c is located on the left side of the critical line, that is, when d≤c≤1.5*d, the area of the transformer provided by the present application is better than the traditional scheme, that is, the transformer provided by the present application has the effect of reducing the packaging size.

[0041] More preferably, in the embodiments provided in the present application, the electrical clearance d required by the basic insulation requirement is 4 mm, the electrical clearance D before the primary and secondary sides required by the enhanced insulation requirement is 8 mm, the EP7 magnetic core is adopted, the 5 pins 4 on the primary side base 1 are arranged in a vertical column, the pin 4 spacing p is 2 mm, one group of primary side coils 11 is wound on the first and second pins 4 from top to bottom on the primary side base 1, and another group of primary side coils 11 is wound on the fourth and fifth pins 4 from top to bottom on the primary side base 1; the secondary side base 3 is arranged with two columns of vertical pins 4, the left column is arranged with 5 pins 4, the pin 4 spacing p is 2 mm, the positions of the 5 pins 4 in the left column are flush with the positions of the 15 pins 4 on the primary side base 1, the first coil 31 is wound on the first and second pins 4 from top to bottom in the left column of the secondary side base 3, the second coil 32 is wound on the fourth and fifth pins 4 from top to bottom in the left column of the secondary side base 3; the third coil 33 is wound on the two pins 4 in the right column of the secondary side base 3, the left and right column spacing b of the secondary side is 3.87 mm, c is calculated to be 4.05 mm, then S = (4.05 + 2*2)*(2*4+3.87) = 95.55 mm2, and the area of the traditional scheme is 2*4*(3*2+2*4) = 112 mm2. It can be compared that the pin 4 arrangement method provided in the present application can effectively reduce the packaging area of the transformer.

[0042] Embodiment 2

[0043] As Figure 3 , Figure 4 and Figure 6As shown, the embodiment of the present application provides a transformer skeleton and pin 4 arrangement method for a high-voltage electric drive converter, which comprises: a winding drum 2 provided with a primary side base 1 and a secondary side base 3 at both ends, the cuboid-shaped winding drum 2 is arranged transversely, and the cuboid-shaped primary side base 1 and the cuboid-shaped secondary side base 3 are both arranged longitudinally; two groups of coils are arranged on the primary side base 1, and four groups of coils are arranged on the secondary side base 3, the arrangement direction of the six groups of coils is transverse arrangement, and the pin 4 spacing in each group of coils is p, wherein the pin 4 spacing p is 1mm, 1.27mm, 2mm, 2.5mm, 2.54mm, 3mm, etc. the most commonly used distance of the pin array according to the application scenario; the four groups of coils on the secondary side base 3 are divided into three rows from top to bottom, wherein the third coil 33 is located in the upper row, the first coil 31 and the second coil 32 are located in the middle row, and the fourth coil 34 is located in the lower row, and the third coil 33 and the fourth coil 34 are symmetrically arranged relative to the middle row; the pins 4 of the two groups of primary side coils 11 are arranged in a row with the third coil 33 and the fourth coil 34 respectively, and the pins 4 of the first coil 31 and the second coil 32 are arranged in a row; wherein the first coil 31 is located on the left side, the distance between the right pin 4 of the first coil 31 and the left pin 4 of the third coil 33 is an electrical clearance value d, and the distance between the left pin 4 of the second coil 32 and the right pin 4 of the third coil 33 is an electrical clearance value d; the distance between the right pin 4 of the first coil 31 and the left pin 4 of the second coil 32 is denoted as c, and the distance between the third coil 33 and the connecting line of the first coil 31 and the second coil 32 is denoted as b, at this time, the longitudinal span of the transformer is 2*b, and b²+(c-p)² / 4=d²; the distance between the longitudinal straight line formed by the right pins 4 of the two groups of primary side coils 11 and the left pin 4 of the first coil 31 is D=2*d, that is, D is twice the electrical clearance value, so that the skeleton meets the requirement of strengthening insulation; and the area of the entire transformer is S=2*b*(D+max(2*(d^2-b^2)^0.5,d)+3*p).

[0044] Figure 5 The change curve of the transformer area S with the change of b and p is shown in the figure, Figure 5 The critical line is the value of 2*b when the transformer area provided by the present application is the same as the traditional transformer area; when the value of 2*b is located on the left side of the critical line, that is, when 0.5*d≤b≤d, d≤2*b≤2*d, the area of the transformer provided by the present application is better than the traditional scheme, that is, the transformer provided by the present application has the effect of reducing the packaging size.

[0045] More preferably, in the embodiments provided in the present application, the electrical clearance d required by the basic insulation requirement is 4 mm, the electrical clearance D before the primary and secondary sides required by the enhanced insulation requirement is 8 mm, the EP7 magnetic core is adopted, the four pins 4 on the primary side base 1 are arranged in two horizontal rows, the distance between the upper and lower two rows of pins 4 is 2*b=6.92 mm, one group of primary side coils 11 is wound on the two pins 4 in the upper row, and the other group of primary side coils 11 is wound on the two pins 4 in the lower row; the secondary side base 3 is arranged in three horizontal rows of pins 4, two pins 4 are arranged in the upper row, four pins 4 are arranged in the middle row, and four pins 4 are arranged in the lower row, the first coil 31 is wound on the secondary side base 3, the third coil 33 is wound on the two pins 4 in the upper row, the fourth coil 34 is wound on the two pins 4 in the lower row, the first coil 31 and the second coil 32 are wound on the pins 4 in the middle row, the distance b from the third coil 33 to the middle row is 3.46 mm, and the distance c between the first coil 31 and the second coil 32 is calculated to be 4 mm, so S=2*3.46*(2*4+4+3*2)=124.7 mm2, and the area of the traditional scheme is 2*4*(4*2+3*4)=160 mm2. It can be compared that the pin 4 arrangement method provided in the present application can effectively reduce the packaging area of the transformer.

[0046] In the embodiments provided in the present application, by providing a systematic pin 4 arrangement design process, engineers can flexibly select the three-coil or four-coil secondary side configuration and the corresponding pin 4 direction according to the required electrical clearance value and the selected pin 4 spacing, and accurately layout according to specific geometric constraints, finally calculate the optimized transformer area, ensure that the transformer skeleton with the smallest packaging size can be actively and efficiently designed under the condition of meeting the strict high-voltage insulation safety standard, and significantly improve the operability and target orientation of the design.

[0047] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. The above describes specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-task processing and parallel processing are possible or can be advantageous.

[0048] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0049] The specification and drawings are, of course, to be regarded in an illustrative rather than a restrictive sense. It is to be understood that any such modifications, variations, combinations or equivalents that fall within the scope of the application are intended to be embraced herein.

Claims

1. A transformer bobbin for a high voltage electric drive inverter, characterized by: The frame is composed of a primary side base (1), a transversely extending bobbin (2) and a secondary side base (3) connected in sequence; a plurality of pairs of pins (4) are arranged on the primary side base (1) and the secondary side base (3), and coils are wound on each pair of pins (4); the connecting direction of each pair of pins (4) is transverse or longitudinal; the plurality of pairs of pins (4) on the secondary side base (3) are distributed in at least two parallel rows; the coils comprise a first coil (31), a second coil (32) and a third coil (33) arranged on the secondary side base (3); a pair of pins (4) corresponding to the first coil (31) and a pair of pins (4) corresponding to the second coil (32) are located on a straight line, and a pair of pins (4) corresponding to the third coil (33) are located on another parallel straight line; the minimum straight line distance between the pins (4) corresponding to the first coil (31), the pins (4) corresponding to the second coil (32) and the pins (4) corresponding to the third coil (33) is an electrical clearance value d; the spacing of each pair of pins (4) is p, the minimum spacing between the pins (4) corresponding to the first coil (31) and the pins (4) corresponding to the second coil (32) is c, and the value of c is not less than the value of d, the spacing between the pins (4) corresponding to the third coil (33) and the straight line formed by the pins (4) corresponding to the first coil (31) and the pins (4) corresponding to the second coil (32) is b, and b²+ (c-p)² / 4=d².

2. A transformer core for a high voltage electric drive inverter according to claim 1, characterized in that, The connecting lines of the pins (4) corresponding to the first coil (31), the pins (4) corresponding to the second coil (32) and the pins (4) corresponding to the third coil (33) are all longitudinal, and d≤c≤1.5*d.

3. A transformer core for a high voltage electric drive inverter according to claim 2, characterized in that, The pins (4) corresponding to the third coil (33) are symmetrically arranged about the transversely extending symmetry axis of the bobbin (2), and the pins (4) corresponding to the first coil (31) and the pins (4) corresponding to the second coil (32) are symmetrically arranged about the transversely extending symmetry axis of the bobbin (2).

4. The transformer tank for a high voltage electric drive inverter according to claim 1, characterized in that, The connecting lines of the pins (4) corresponding to the first coil (31), the pins (4) corresponding to the second coil (32) and the pins (4) corresponding to the third coil (33) are all transverse, and 0.5*d≤b≤d.

5. A transformer core for a high voltage electric drive inverter according to claim 4, characterized in that, The coils further comprise a fourth coil (34), and a pair of pins (4) corresponding to the fourth coil (34) are symmetric to a straight line formed by a pair of pins (4) corresponding to the third coil (33) and a pair of pins (4) corresponding to the first coil (31) and the second coil (32).

6. A transformer core for a high voltage electric drive inverter according to claim 5, characterized in that, The pair of pins (4) corresponding to the first coil (31) and the pair of pins (4) corresponding to the second coil (32) are both located on the transversely extending symmetry axis of the bobbin (2).

7. A transformer core for a high voltage electric drive inverter according to claim 3 or 6, characterized in that, The coils further comprise two groups of primary side coils (11) on the primary side base (1), and the two groups of primary side coils (11) are longitudinally distributed; in the longitudinal projection, the minimum spacing between the pins (4) on the primary side base (1) and the pins (4) on the secondary side base (3) is D, and D=d or D=2*d.

8. A transformer core for a high voltage electric drive inverter according to claim 7, characterized in that, The connecting direction of each of the primary coil (11) corresponding to two pins (4) is the same as the connecting direction of the first coil (31) corresponding to two pins.

9. The transformer core for a high voltage electric drive inverter of claim 7, wherein, In the transverse projection, the distance between the two groups of primary coils (11) is not greater than the maximum distance between the coils on the secondary base (3), and the two groups of primary coils (11) are located between the coils at the longitudinal ends of the secondary base (3).

10. A method of pin arrangement for a high voltage electric drive inverter, characterized by, The method comprises the following specific steps: S1, determining the electrical clearance value corresponding to the basic insulation requirement of the transformer as d, the electrical clearance corresponding to the enhanced insulation as D, and selecting the distance between each pair of pins (4) as p; placing the winding drum (2) of the skeleton horizontally, arranging two groups of primary coils (11) on the primary base (1) of the skeleton, and arranging three or four groups of secondary coils on the secondary base (3); S2, if three groups of secondary coils are arranged on the secondary base (3), denoted as the first coil (31), the second coil (32) and the third coil (33), the two pins (4) of each group of secondary coils are arranged longitudinally, the pins (4) of the first coil (31) and the pins (4) of the second coil (32) are located on a straight line, the third coil (33) is located on one side of the straight line, the pin (4) connecting line of the third coil (33) is parallel to the straight line, and the minimum straight line distance between the two pins (4) of the first coil (31) and the two pins (4) of the second coil (32) and the pin (4) of the third coil (33) is d, the minimum straight line distance between the corresponding pins (4) of the first coil (31) and the corresponding pins (4) of the second coil (32) is denoted as c, the distance between the third coil (33) and the straight line formed by the first coil (31) and the second coil (32) is b, and in the longitudinal projection, the minimum transverse span of the primary coil (11) and the coil on the secondary base is D, so that the area of the transformer is S=(c+2*p)*(D+b), and d≤c≤1.5*d. If four groups of secondary side coils are set on the secondary side base (3) and are recorded as the first coil (31), the second coil (32), the third coil (33) and the fourth coil (34), the pins (4) of each group of the secondary side coils and the pins (4) of the primary side coil (11) are set horizontally, two groups of the pins (4) of the primary side coil (11) are located on two parallel longitudinal straight lines, the pins (4) of the first coil (31) and the second coil (32) are located on a straight line, the third coil (33) is located on one side of the straight line and the connecting line of the pins (4) of the third coil (33) is parallel to the straight line, and the minimum straight line distance between the two pins (4) of the first coil (31) and the two pins (4) of the second coil (32) and the pins (4) of the third coil (33) is d, the fourth coil (34) is symmetrically set on the other side of the connecting line of the first coil (31) and the second coil (32) relative to the third coil (33), the minimum straight line distance between the corresponding pins (4) of the first coil (31) and the corresponding pins (4) of the second coil (32) is recorded as c, the distance between the third coil (33) and the straight line formed by the first coil (31) and the second coil (32) is b, and in the longitudinal projection, the minimum horizontal span of the primary side coil (11) and the coil on the secondary side base is D, so that the area of the transformer is S=2*b*(D+max(2*(d^2-b^2)^0.5,d)+3*p), and 0.5*d≤b≤d.

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