Welding type power device non-contact voltage and current integrated measuring device

Abstract

The invention provides a non-contact voltage and current integrated measurement device for a welding type power device. The non-contact voltage and current integrated measurement device comprises a measurement module and a calculation module, the measuring module comprises a substrate, a first coil, a second coil and a connecting hole; the substrate comprises a shielding layer, an annular wiring layer and an insulating layer; the two sides outside the wiring layers are each provided with a shielding layer, and insulating layers are arranged between the adjacent wiring layers and between the shielding layers and the adjacent wiring layers. The first coil comprises a first head end, a first tail end and a first wire; the second coil comprises a second head end, a second tail end and a second wire; the first wiring and the second wiring are opposite in rotation direction and are arranged on the wiring layer through the connecting holes; the first head end and the second head end are respectively grounded; the first tail end and the second tail end are respectively connected with the input end of the calculation module. The non-contact voltage and current integrated measuring device for the welding type power device is small in size, high in space utilization rate, high in integration level and capable of synchronously measuring the voltage and the current of the welding type power device.

Description

Technical Field

[0001] The invention relates to the technical field of voltage and current measurement of welding type power devices, and in particular to a non-contact voltage and current integrated measurement device for welding type power devices. Background Art

[0002] High-voltage and high-power power electronic devices play a vital role in high-voltage and high-power applications such as flexible DC transmission and large-capacity power conversion. As a typical representative of high-voltage and high-power power electronic devices, the accurate measurement of the switching voltage and current of welding power devices is of decisive significance for evaluating the switching characteristics of devices, calculating the energy loss of the switching process, and optimizing the performance and efficiency of power electronic equipment.

[0003] The sampling resistance method is low-cost and simple in principle, but it will damage the insulation and airtightness of the package. Therefore, most commercial sensors currently use non-contact methods to measure current or voltage. At present, the integration research of non-contact measurement systems mainly focuses on the integration of single physical quantity measurement systems and the measured subject: Non-contact current measurement method: Hall sensors have limited bandwidth and are sensitive to external magnetic fields; current sensors have strong anti-interference capabilities but are large in size and have built-in iron cores, while optical fiber current sensors have a large measurement range but are expensive and have insufficient anti-interference capabilities. In contrast, commercial Rogowski coils are non-invasive and have good linearity, and have good application prospects in the testing of power device currents. Although PCB Rogowski coils have lower measurement accuracy than commercial Rogowski coils, they are easy to integrate, have high reliability, and are low in cost.

[0004] Non-contact voltage measurement method: Currently, the focus is on power line voltage measurement, and there is little research on non-contact voltage measurement of devices. However, regarding the measurement of device switching voltage, some scholars have proposed a high-anti-interference electric field probe based on shielded copper cladding and via arrays to measure the switching voltage of SiC MOSFET. This non-contact probe uses the principle of electric field coupling and has the advantages of low invasiveness, small size, and easy integration, overcoming the integration difficulties of traditional contact probes.

[0005] There is a relative lack of integrated research on the use of non-contact methods to achieve synchronous measurement of multiple physical quantities, and this field urgently needs further exploration and supplementation. In addition, the increase in the power density of UHV converter valves requires a more compact internal structure, which limits the installation space of various sensors used for equipment status monitoring and affects their development. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a non-contact voltage and current integrated measuring device for welding power devices which can synchronously measure voltage and current and has small size, high space utilization and high integration.

[0007] To achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: a non-contact voltage and current integrated measurement device for welding power devices, comprising a measurement module and a calculation module; The measuring module comprises a substrate, a first coil, a second coil and a connecting hole; The substrate comprises two stacked shielding layers, a plurality of wiring layers and a plurality of insulating layers; one shielding layer is disposed on each of the two sides outside the plurality of wiring layers, and one insulating layer is disposed between adjacent wiring layers and between the shielding layer and the adjacent wiring layer; The wiring layer is in a ring shape; The first coil includes a first head end, a first tail end and a first wiring; the first wiring is connected between the first head end and the first tail end; the first wiring is arranged on a plurality of wiring layers, and the first wirings between the wiring layers are connected through the connection holes; The second coil includes a second head end, a second tail end, and a second wiring; the second wiring is connected between the second head end and the second tail end; the second wiring is arranged on a plurality of wiring layers, and the second wirings between the wiring layers are connected through the connection holes; The first wiring and the second wiring have opposite rotation directions; The first head end and the second head end are grounded respectively; The first tail end and the second tail end are respectively connected to the input end of the calculation module.

[0008] Further, the plurality of wiring layers include a first signal layer, a first loop layer, a second loop layer and a second signal layer which are sequentially stacked; The connecting holes include through holes and via holes; The first wiring is arranged on the first signal layer, the second signal layer and the second loop layer respectively; the first wiring between the first signal layer and the second signal layer is connected through the through hole, and the first wiring between the first signal layer and the second loop layer, or the first wiring between the second signal layer and the second loop layer is connected through the via hole; The second wiring is respectively arranged on the first signal layer, the second signal layer and the first loop layer; the second wiring between the first signal layer and the second signal layer is connected through the through hole, and the second wiring between the first signal layer and the first loop layer, or the second wiring between the second signal layer and the first loop layer is connected through the via hole.

[0009] Furthermore, the substrate is in a rectangular closed loop shape.

[0010] Furthermore, the through hole passes through two side surfaces of the substrate; Dividing the substrate into wiring areas according to the through holes, wherein the wiring areas include a signal area and a connection area; The number of the connection areas is four, and the four connection areas are respectively located at the four corners of the substrate; The number of the signal areas is four, and one signal area is provided between each of two adjacent connection areas; The through hole is located in the signal area.

[0011] Further, the first wiring includes a plurality of first signal lines, a plurality of first connection lines and a first loop line; Along the signal transmission direction: the head end of the first first signal line is connected to the first head end; between adjacent first signal lines, the tail end of the first signal line is connected to the head end of the first signal line adjacent in sequence; the tail end of the last first signal line is connected to the head end of the first loop line through the first connecting line; The tail end of the first loop is connected to the first tail end; The second wiring includes a plurality of second signal lines, a plurality of second connection lines and a second loop line; Along the signal transmission direction: the head end of the first second signal line is connected to the second head end; between adjacent second signal lines, the tail end of the second signal line is connected to the head end of the second signal line adjacent in sequence; the tail end of the last second signal line is connected to the head end of the second loop line through the second connecting line; The tail end of the second loop is connected to the second tail end.

[0012] Further, the number of the first signal lines and the number of the second signal lines are both four, the four first signal lines correspond one-to-one to the four signal areas, and the four second signal lines correspond one-to-one to the four signal areas; The first signal line includes a plurality of first upper signal lines and a plurality of first lower signal lines connected thereto; the second signal line includes a plurality of second upper signal lines and a plurality of second lower signal lines connected thereto; A plurality of the first upper signal lines are parallel to a plurality of the second upper signal lines, and a plurality of the first lower signal lines are parallel to a plurality of the second lower signal lines; in the first signal layer, the first upper signal lines are spaced apart from the second upper signal lines and are arranged at an equal distance; in the second signal layer, the first lower signal lines are spaced apart from the second lower signal lines and are arranged at an equal distance; The number of the first upper layer signal lines, the number of the first lower layer signal lines, the number of the second upper layer signal lines and the number of the second lower layer signal lines are all the same; The first upper signal lines and the first lower signal lines are arranged alternately in a V shape, and the second lower signal lines and the second upper signal lines are arranged alternately in a V shape; In the direction of signal transmission: The tail end of the first upper layer signal line is connected to the head end of the first lower layer signal line that is sequentially adjacent through the through hole, and the tail end of the first lower layer signal line is connected to the head end of the first upper layer signal line that is sequentially adjacent through the through hole; the tail end of the second lower layer signal line is connected to the head end of the second upper layer signal line that is sequentially adjacent through the through hole, and the tail end of the second upper layer signal line is connected to the head end of the second lower layer signal line that is sequentially adjacent through the through hole; In the first of the first signal lines, the first head end of the first upper signal line is connected to the first head end; in the first of the second signal lines, the first head end of the first lower signal line is connected to the second head end; Among the adjacent first signal lines, the tail end of the last first lower signal line among the first signal lines is connected to the head end of the first first upper signal line among the sequentially adjacent first signal lines through the through hole and the first connecting line; among the adjacent second signal lines, the tail end of the last second upper signal line among the second signal lines is connected to the head end of the first second lower signal line among the sequentially adjacent second signal lines through the through hole and the second connecting line; In the last first signal line, the tail end of the last first lower signal line is connected to the head end of the first loop line through the first connecting line and through the via hole; in the last second signal line, the tail end of the last second upper signal line is connected to the head end of the second loop line through the second connecting line and through the via hole; The first wiring is wired along a first direction, the first loop is wired along a second direction, the second wiring is wired along the second direction, and the second loop is wired along the first direction, and the first direction is opposite to the second direction.

[0013] Further, the through hole comprises four through hole groups, and one through hole group is arranged in each signal area; The through hole group includes a plurality of inner circle through holes and a plurality of outer circle through holes, and the number of the inner circle through holes is the same as that of the outer circle through holes; The inner circle through holes are arranged along the inner edge of the substrate; in the four through hole groups, the inner circle through holes are arranged in a rectangular ring shape; The outer ring through holes are arranged along the outer edge of the substrate; in the four through hole groups, the outer ring through holes are arranged in a rectangular ring shape; In each of the through hole groups, the spacing between the inner circle through holes is the same as the spacing between the outer circle through holes; The through hole groups are symmetrically arranged in two opposite signal areas; The first loop and the second loop are arranged along the center line respectively, and in each of the signal areas, the distance from the inner circle through hole to the center line is equal to the distance from the outer circle through hole to the center line; In the direction of signal transmission: The tail end of the first upper layer signal line and the tail end of the second lower layer signal line are respectively connected to the inner circle through hole; The tail end of the first lower layer signal line and the tail end of the second upper layer signal line are respectively connected to the outer circle through holes.

[0014] Furthermore, the signal area includes a first signal area, a first signal area and a second signal area, and the first signal area and the second signal area are located at two ends of the first signal area respectively; The connection area includes a first connection area and a second connection area, the first connection area is located between the first signal area and the first signal area, and the second connection area is located between the first signal area and the second signal area; In the direction of signal transmission: The first wiring enters the first signal area from the first connection area, passes through the first signal area, the second signal area and the first signal area in sequence to route the first signal line, in the first signal area, the first signal line is connected to the first loop line, and starts from the first signal area, passes through the second signal area and the first signal area in sequence, and then enters the first connection area to route the first loop line; The second wiring enters the first signal area from the second connection area, and the wiring of the second signal line is carried out through the first signal area, the first signal area and the second signal area in sequence. In the second signal area, the second signal line is connected to the second loop line, and the wiring of the second loop line starts from the second signal area, passes through the first signal area and the first signal area in sequence, and then enters the second connection area.

[0015] Furthermore, the shielding layer includes a first shielding layer and a second shielding layer, the first shielding layer is stacked and arranged outside the first signal layer, and the second shielding layer is stacked and arranged outside the second signal layer.

[0016] Further, the calculation module includes an adder and a differentiator; The output value of the adder is a voltage-related quantity of the welding type power device, and the output value of the differentiator is a current-related quantity of the welding type power device.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a non-contact voltage and current integrated measuring device for a welding power device, which is small in size and can be integrated with the collector terminal of the welding power device. There is no need to open the inside of the welding power device. At the same time, non-contact measurement of the current and voltage of the welding power device can be achieved, which significantly reduces the installation space of the sensor and improves the space utilization rate.

[0018] 2. The present invention is proposed under the background that the installation space of various sensors used for welding power device status monitoring is limited. It can realize the synchronous measurement of the voltage and current of the welding power device by using an integrated measuring device. Compared with the traditional single physical quantity (current or voltage) measurement system, it does not increase the cost, has higher space utilization and better integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the present invention in use state; Figure 2 It is a structural schematic diagram of the measurement module in the present invention; Figure 3 Schematic diagram of the structure of each layer of the measurement module in the present invention: (a) is the first shielding layer, (b) is the first signal layer, (c) is the first loop layer, (d) is the second loop layer, (e) is the second signal layer, and (f) is the second shielding layer; Figure 4 It is a schematic diagram of a partial cross-sectional structure of the present invention; Figure 5 Schematic diagram of the position of the through hole in the present invention.

[0020] The reference numerals are: 1, measuring module; 11, first coil; 111, first head end; 112, first upper signal line; 113, first lower signal line; 114, first connecting line; 115, first loop line; 116, first tail end; 12, second coil; 121, second head end; 122, second lower signal line; 123, second upper signal line; 124, second connecting line; 125, second loop line; 126, second tail end; 13, Through hole; 131, inner circle through hole; 132, outer circle through hole; 141, first via hole; 142, second via hole; 15, substrate; 151, wiring layer; 1511, first signal layer; 1512, first loop layer; 1513, second loop layer; 1514, second signal layer; 1521, first shielding layer; 1522, second shielding layer; 153, insulating layer; 161, signal area; 162, connection area; 2, computing module; 3, collector terminal. DETAILED DESCRIPTION

[0021] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0022] See also Figure 1 , an embodiment of the present invention provides a non-contact voltage and current integrated measurement device for a welding type power device, comprising a measurement module 1 and a calculation module 2; See also Figure 2 The measuring module includes a substrate 15, a first coil 11, a second coil 12 and a connecting hole; preferably, the first coil 11 and the second coil 12 are made of copper; See also Figure 4 The substrate 15 includes two stacked shielding layers, a plurality of wiring layers 151 and a plurality of insulating layers 153; a shielding layer is disposed on each side of the plurality of wiring layers 151, and an insulating layer 153 is disposed between adjacent wiring layers 152 and between the shielding layer and the adjacent wiring layer 151; The wiring layer 151 is in a ring shape; preferably, the insulating layer 153 and the shielding layer are both in a ring shape, and the substrate 15 is in a ring shape; further, the substrate 15 is in a rectangular closed loop shape.

[0023] The first coil 11 includes a first head end 111, a first tail end 116 and a first wiring; the first wiring is connected between the first head end 111 and the first tail end 116; the first wiring is arranged on a plurality of wiring layers 151, and the first wirings located between the wiring layers 151 are connected through connection holes; The second coil 12 includes a second head end 121, a second tail end 126, and a second wiring; the second wiring is connected between the second head end 121 and the second tail end 126; the second wiring is arranged on a plurality of wiring layers 151, and the second wirings located between the wiring layers 151 are connected through connection holes; See also Figure 3 (b) and (e) the rotation direction of the first wiring is opposite to that of the second wiring; The first head end 111 and the second head end 121 are grounded respectively; The first tail end 116 and the second tail end 126 are respectively connected to the input end of the computing module 2. Preferably, the first tail end 116 and the second tail end 126 are respectively connected to the input end of the computing module 2 through a pad and a radio frequency input line.

[0024] There are multiple collector terminals 3 on the welding type power device. When in use, the measurement module 1 is set, integrated or nested on the outside of any collector terminal 3, and the substrate 15 is located between the top and bottom surfaces of the collector terminal 3, or at least the wiring layer 151 is located between the top and bottom surfaces of the collector terminal 3. Usually, the distance between the inner wall of the substrate 15 and the outer wall of the collector terminal 3 is about 1 mm, which is specifically determined by the safe clearance distance; The calculation module 2 includes an adder and a differentiator; When the PCB Rogowski coil is sheathed or nested outside the collector terminal 3, the inside of the PCB Rogowski coil is not only affected by the magnetic field generated by the current passing through the collector terminal 3, but also by the electric field generated by the internal voltage because the outer wall of the PCB Rogowski coil cannot be shielded. Therefore, when the PCB Rogowski coil is measuring current, the transient electric field changes around the collector terminal 3 will directly affect the measurement results of the PCB Rogowski coil and generate current measurement errors. This current measurement error is a voltage-related quantity. Therefore, the output of the PCB Rogowski coil is a current-related quantity. Voltage related quantities Overlay The first coil 11 and the second coil 12 are respectively arranged on the substrate 15 of the integrated measuring device of the present invention. Figure 2 , and the rotation direction of the first wiring is opposite to that of the second wiring, that is, the winding methods of the first coil 11 and the second coil 12 are opposite. The measurement principle of the integrated measurement device is: Figure 2 For example, the first coil 11 is a counter-wound Rogowski coil, and the second coil 12 is a forward-wound Rogowski coil. According to the right-hand screw rule, the actual current passing through the counter-wound Rogowski coil has a reference direction opposite to that of the forward-wound Rogowski coil, that is, the current-related quantity becomes , and for the reverse-wound Rogowski coil, the polarity of the measured voltage is always the same as that of the forward-wound Rogowski coil, so the voltage-related quantity in the reverse-wound Rogowski coil and the forward-wound Rogowski coil remains unchanged. Formula 1 is obtained: ; In the formula, is the output of the first coil, is the output of the second coil, is the output value of the differentiator, that is, the quantity output by the differential circuit, which is the current-related quantity of the welding power device. It is the output value of the adder, that is, the quantity output by the adder, which is the voltage-related quantity of the welding type power device.

[0025] The output value of the adder is the voltage-related quantity of the welding power device, and the output value of the differentiator is the current-related quantity of the welding power device. According to Formula 1, the voltage-related quantity of the welding power device and the current-related quantity of the welding power device are respectively: ; Further, the plurality of wiring layers 151 include a first signal layer 1511 , a first loop layer 1512 , a second loop layer 1513 , and a second signal layer 1514 which are sequentially stacked; The connection holes include through holes 13 and via holes; See also Figure 3(b), (d), (e), the first wiring is arranged on the first signal layer 1511, the second signal layer 1514 and the second loop layer 1513 respectively; the first wiring between the first signal layer 1511 and the second signal layer 1514 is connected through the through hole 13, and the first wiring between the first signal layer 1511 and the second loop layer 1513, or the first wiring between the second signal layer 1514 and the second loop layer 1513 is connected through a via hole; See also Figure 3 (b), (c), (e), the second wiring is arranged on the first signal layer 1511, the second signal layer 1514 and the first loop layer 1512 respectively; the second wiring between the first signal layer 1511 and the second signal layer 1514 is connected through the through hole 13, and the second wiring between the first signal layer 1511 and the first loop layer 1512, or the second wiring between the second signal layer 1514 and the first loop layer 1512 is connected through a via.

[0026] In some preferred embodiments, the through hole 13 passes through two sides of the substrate 15; The substrate 15 is divided into wiring areas according to the through holes 13, see Figure 5 , the wiring area includes a signal area 161 and a connection area 162; There are four connection areas 162, and the four connection areas 162 are respectively located at the four corners of the substrate 15; There are four signal areas 161, one signal area 161 is provided between each of two adjacent connection areas 162; The through hole 13 is located in the signal area 161 .

[0027] The first wiring includes a plurality of first signal lines, a plurality of first connection lines 114 and a first return line 115; Along the signal transmission direction: the head end of the first first signal line is connected to the first head end 111; between adjacent first signal lines, the tail end of the first signal line is connected to the head end of the first signal line adjacent in sequence; the tail end of the last first signal line is connected to the head end of the first loop line 115 through the first connecting line 114; The tail end of the first loop line 115 is connected to the first tail end 116; The second wiring includes a plurality of second signal lines, a plurality of second connection lines 124 and a second return line 125; Along the signal transmission direction: the head end of the first second signal line is connected to the second head end 121; between adjacent second signal lines, the tail end of the second signal line is connected to the head end of the second signal line adjacent in sequence; the tail end of the last second signal line is connected to the head end of the second loop line 125 through the second connecting line 124; The tail end of the second loop line 125 is connected to the second tail end 126 .

[0028] Further, the number of the first signal lines and the number of the second signal lines are both four, the four first signal lines correspond one-to-one to the four signal areas 161, and the four second signal lines correspond one-to-one to the four signal areas 161; The first signal line includes a plurality of first upper signal lines 112 and a plurality of first lower signal lines 113 connected thereto; the second signal line includes a plurality of second upper signal lines 123 and a plurality of second lower signal lines 122 connected thereto; A plurality of first upper signal lines 112 and a plurality of second upper signal lines 123 are parallel to each other, and a plurality of first lower signal lines 113 and a plurality of second lower signal lines 122 are parallel to each other; in the first signal layer 1511, the first upper signal lines 112 and the second upper signal lines 123 are spaced apart and arranged at an equal distance; in the second signal layer 1514, the first lower signal lines 113 and the second lower signal lines 122 are spaced apart and arranged at an equal distance; The number of the first upper layer signal lines 112 , the number of the first lower layer signal lines 113 , the number of the second upper layer signal lines 123 , and the number of the second lower layer signal lines 122 are all the same; The first upper signal lines 112 and the first lower signal lines 113 are arranged alternately in a V shape, and the second lower signal lines 122 and the second upper signal lines 123 are arranged alternately in a V shape; In the direction of signal transmission: The tail end of the first upper layer signal line 112 is connected to the head end of the first lower layer signal line 113 adjacent in sequence through the through hole 13, and the tail end of the first lower layer signal line 113 is connected to the head end of the first upper layer signal line 112 adjacent in sequence through the through hole 13; the tail end of the second lower layer signal line 123 is connected to the head end of the second upper layer signal line 122 adjacent in sequence through the through hole 13, and the tail end of the second upper layer signal line 122 is connected to the head end of the second lower layer signal line 123 adjacent in sequence through the through hole 13; In the first first signal line, the first end of the first upper signal line 112 is connected to the first end 111; in the first second signal line, the first end of the first second lower signal line 123 is connected to the second end 121; In the adjacent first signal lines, the tail end of the last first lower signal line 113 in the first signal lines is connected to the head end of the first first upper signal line 112 in the first signal lines that are adjacent to each other via the through hole 13 and the first connecting line 114; in the adjacent second signal lines, the tail end of the last second upper signal line 122 in the second signal lines is connected to the head end of the first second lower signal line 123 in the second signal lines that are adjacent to each other via the through hole 13 and the second connecting line 124; In the last first signal line, the tail end of the last first lower signal line 113 is connected to the head end of the first loop line 115 through the first connecting line 114 and the first via hole 141; in the last second signal line, the tail end of the last second upper signal line 122 is connected to the head end of the second loop line 125 through the second connecting line 124 and the second via hole 142; The first wiring is routed along a first direction, the first loop line 115 is routed along a second direction, the second wiring is routed along the second direction, and the second loop line 125 is routed along the first direction, the first direction being opposite to the second direction.

[0029] Further, see Figure 5 , the through hole 13 includes four through hole groups, and one through hole group is arranged in each signal area 161; The through hole group includes a plurality of inner ring through holes 131 and a plurality of outer ring through holes 132, and the number of the inner ring through holes 131 is the same as that of the outer ring through holes 132; The inner circle through holes 131 are arranged along the inner edge of the substrate 15; in the four through hole groups, the inner circle through holes 131 are arranged in a rectangular ring shape; in the four through hole groups, the inner circle through holes 131 are arranged along the first rectangle; The outer ring through holes 132 are arranged along the outer edge of the substrate 15; in the four through hole groups, the outer ring through holes 132 are arranged in a rectangular ring shape; in the four through hole groups, the outer ring through holes 132 are arranged along the second rectangle; the center of the substrate, the center of the first rectangle and the center of the second rectangle are all consistent; In each through hole group, the spacing between the inner circle through holes 131 is the same as the spacing between the outer circle through holes 132; The through hole groups are symmetrically arranged in two opposite signal areas 161; The first loop 115 and the second loop 125 are arranged along the center line respectively. In each signal area 161, the distance from the inner circle through hole 131 to the center line is equal to the distance from the outer circle through hole 132 to the center line. In the direction of signal transmission: The tail end of the first upper signal line 112 and the tail end of the second lower signal line 123 are respectively connected to the inner circle through hole 131; The tail end of the first lower signal line 113 and the tail end of the second upper signal line 122 are connected to the outer circle through hole 132 respectively.

[0030] Further, the signal area 161 includes a first signal area, a first signal area and a second signal area, and the first signal area and the second signal area are located at two ends of the first signal area correspondingly; The connection area 162 includes a first connection area and a second connection area, the first connection area is located between the first signal area and the first signal area, and the second connection area is located between the first signal area and the second signal area; In the direction of signal transmission: The first wiring enters the first signal area from the first connection area, and the wiring of the first signal line is carried out successively through the first signal area, the second signal area and the first signal area. In the first signal area, the first signal line is connected with the first loop line 115, and the wiring of the first loop line 115 starts from the first signal area, passes through the second signal area and the first signal area successively, and then enters the first connection area. The second wiring enters the first signal area from the second connection area, and the second signal line is routed through the first signal area, the first signal area, and the second signal area in sequence. In the second signal area, the second signal line is connected to the second loop line 125. Starting from the second signal area, the second loop line 125 is routed after passing through the first signal area and the first signal area and then entering the second connection area.

[0031] According to the measurement principle of the above integrated measurement device, since the current-related quantities in the first coil 11 and the second coil 12 are required to be opposite and the voltage-related quantities in the two coils are the same during measurement, the requirement for parameter symmetry is very high, and it is necessary to ensure that the winding parameters and positions of the forward-winding Rogowski coil and the reverse-winding Rogowski coil are basically the same, so the two coils need to be wound around each other between the same two layers of the same substrate 15. It is difficult to ensure the symmetry of their induction quantities when the two coils are in different positions; In each signal area, the first wiring and the second wiring are both triangular wiring, that is, V-shaped wiring, see Figure 2, the black line is the first signal line, the black solid line is the first upper signal line 112, the black dotted line is the first lower signal line 113, the blue line is the second signal line, the blue solid line is the second upper signal line 123, and the blue dotted line is the second lower signal line 122. Taking the first wiring as an example, the first wiring enters the first signal area from the first connection area at the first signal layer 1511, and is wired between the inner layer through hole 131 and the adjacent outer layer through hole 132 in the second signal layer 1514, and is wired between the outer layer through hole 132 and the adjacent inner layer through hole 131 in the first signal layer 151 until the wiring in the first signal area is completed, and enters the second signal layer 1511 in the clockwise direction through the first connection line 114 through the second connection area. In the signal area, wiring is also performed between the inner through hole 131 and the adjacent outer through hole 132 in the second signal layer 1514, and wiring is performed between the outer through hole 132 and the adjacent inner through hole 131 in the first signal layer 151, until the wiring in the second signal area is completed. After the wiring of the remaining two signal areas is completed in sequence, it is connected to the head end of the first loop 115 through the first via 141. The first loop 115 is wired from the first signal area to the first connection area in a counterclockwise direction. The head end of the first wiring is connected to the first head end 111 outside the first connection area, and the tail end of the first wiring is connected to the first tail end 116 outside the first connection area. The wiring method of the second wiring is similar to that of the first wiring, but the winding direction is different, which will not be repeated. The first connection line 114 and the second connection line 124 are respectively wired along the outer edge of the substrate 15. Usually, the loop is set to offset the coupling of the vertical magnetic field passing through a single coil, so the plane area enclosed by the first loop 114, the plane area enclosed by the second loop 124, the plane area enclosed by the first signal line connected by the first connecting line, and the plane area enclosed by the second signal line connected by the second connecting line are the same or as close to the same as possible.

[0032] Furthermore, the shielding layer includes a first shielding layer 1521 and a second shielding layer 1522 . The first shielding layer 1521 is stacked and arranged outside the first signal layer 1511 , and the second shielding layer 1522 is stacked and arranged outside the second signal layer 1514 .

[0033] Preferably, see Figure 3 (a), the first shielding layer 1521 includes two first L-shaped plates, the inner corners of the two first L-shaped plates are arranged in a rectangular shape, the side plates of the two first L-shaped plates correspond to a signal area respectively, the ends and corners of the first L-shaped plates at both ends are located in the connection area, and the ends of the two first L-shaped plates are spaced apart to prevent the generation of circulating current; See also Figure 3(f), the second shielding layer 1522 includes two second L-shaped plates, the inner corners of the two second L-shaped plates are arranged in a rectangular shape, the side plates of the two second L-shaped plates correspond to a signal area respectively, the ends and corners of the second L-shaped plates at both ends are located in the connection area, and the ends of the two second L-shaped plates are spaced apart to prevent the generation of circulating current; The corner of the first L-shaped plate corresponds to the end of the second L-shaped plate, and the end of the first L-shaped plate corresponds to the corner of the second L-shaped plate.

[0034] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A non-contact voltage and current integrated measurement device for welding power devices, characterized in that: It includes a measurement module and a calculation module; The measuring module comprises a substrate, a first coil, a second coil and a connecting hole; The substrate comprises two stacked shielding layers, a plurality of wiring layers and a plurality of insulating layers; one shielding layer is disposed on each of the two sides outside the plurality of wiring layers, and one insulating layer is disposed between adjacent wiring layers and between the shielding layer and the adjacent wiring layer; The wiring layer is in a ring shape; The first coil includes a first head end, a first tail end and a first wiring; the first wiring is connected between the first head end and the first tail end; the first wiring is arranged on a plurality of wiring layers, and the first wirings between the wiring layers are connected through the connection holes; The second coil includes a second head end, a second tail end, and a second wiring; the second wiring is connected between the second head end and the second tail end; the second wiring is arranged on a plurality of wiring layers, and the second wirings between the wiring layers are connected through the connection holes; The first wiring and the second wiring have opposite rotation directions; The first head end and the second head end are grounded respectively; The first tail end and the second tail end are respectively connected to the input end of the calculation module.

2. The non-contact voltage and current integrated measurement device for welding power devices according to claim 1, characterized in that: The plurality of wiring layers include a first signal layer, a first loop layer, a second loop layer, and a second signal layer which are sequentially stacked; The connecting holes include through holes and via holes; The first wiring is arranged on the first signal layer, the second signal layer and the second loop layer respectively; the first wiring between the first signal layer and the second signal layer is connected through the through hole, and the first wiring between the first signal layer and the second loop layer, or the first wiring between the second signal layer and the second loop layer is connected through the via hole; The second wiring is arranged on the first signal layer, the second signal layer and the first loop layer respectively; The second wiring between the first signal layer and the second signal layer is connected through the through hole, and the second wiring between the first signal layer and the first loop layer or the second wiring between the second signal layer and the first loop layer is connected through the via hole.

3. The non-contact voltage and current integrated measurement device for welding power devices according to claim 2, characterized in that: The substrate is in a rectangular closed loop shape.

4. The non-contact voltage and current integrated measurement device for welding power devices according to claim 3, characterized in that: The through hole passes through two side surfaces of the substrate; Dividing the substrate into wiring areas according to the through holes, wherein the wiring areas include a signal area and a connection area; The number of the connection areas is four, and the four connection areas are respectively located at the four corners of the substrate; The number of the signal areas is four, and one signal area is provided between each of two adjacent connection areas; The through hole is located in the signal area.

5. The non-contact voltage and current integrated measurement device for welding power devices according to claim 4, characterized in that: The first wiring includes a plurality of first signal lines, a plurality of first connection lines and a first loop line; Along the signal transmission direction: the head end of the first first signal line is connected to the first head end; between adjacent first signal lines, the tail end of the first signal line is connected to the head end of the first signal line adjacent in sequence; the tail end of the last first signal line is connected to the head end of the first loop line through the first connecting line; The tail end of the first loop is connected to the first tail end; The second wiring includes a plurality of second signal lines, a plurality of second connection lines and a second loop line; Along the signal transmission direction: the head end of the first second signal line is connected to the second head end; between adjacent second signal lines, the tail end of the second signal line is connected to the head end of the second signal line adjacent in sequence; the tail end of the last second signal line is connected to the head end of the second loop line through the second connecting line; The tail end of the second loop is connected to the second tail end.

6. The non-contact voltage and current integrated measurement device for welding power devices according to claim 5, characterized in that: The number of the first signal lines and the number of the second signal lines are both four, the four first signal lines correspond one-to-one to the four signal areas, and the four second signal lines correspond one-to-one to the four signal areas; The first signal line includes a plurality of first upper signal lines and a plurality of first lower signal lines connected thereto; the second signal line includes a plurality of second upper signal lines and a plurality of second lower signal lines connected thereto; A plurality of the first upper signal lines are parallel to a plurality of the second upper signal lines, and a plurality of the first lower signal lines are parallel to a plurality of the second lower signal lines; in the first signal layer, the first upper signal lines are spaced apart from the second upper signal lines and are arranged at an equal distance; in the second signal layer, the first lower signal lines are spaced apart from the second lower signal lines and are arranged at an equal distance; The number of the first upper layer signal lines, the number of the first lower layer signal lines, the number of the second upper layer signal lines and the number of the second lower layer signal lines are all the same; The first upper signal lines and the first lower signal lines are arranged alternately in a V shape, and the second lower signal lines and the second upper signal lines are arranged alternately in a V shape; In the direction of signal transmission: The tail end of the first upper layer signal line is connected to the head end of the first lower layer signal line that is sequentially adjacent through the through hole, and the tail end of the first lower layer signal line is connected to the head end of the first upper layer signal line that is sequentially adjacent through the through hole; the tail end of the second lower layer signal line is connected to the head end of the second upper layer signal line that is sequentially adjacent through the through hole, and the tail end of the second upper layer signal line is connected to the head end of the second lower layer signal line that is sequentially adjacent through the through hole; In the first of the first signal lines, the head end of the first of the first upper layer signal lines is connected to the first head end; In the first of the second signal lines, the first head end of the second lower layer signal line is connected to the second head end; Among the adjacent first signal lines, the tail end of the last first lower signal line among the first signal lines is connected to the head end of the first first upper signal line among the sequentially adjacent first signal lines through the through hole and the first connecting line; among the adjacent second signal lines, the tail end of the last second upper signal line among the second signal lines is connected to the head end of the first second lower signal line among the sequentially adjacent second signal lines through the through hole and the second connecting line; In the last first signal line, the tail end of the last first lower signal line is connected to the head end of the first loop line through the first connecting line and through the via hole; in the last second signal line, the tail end of the last second upper signal line is connected to the head end of the second loop line through the second connecting line and through the via hole; The first wiring is wired along a first direction, the first loop is wired along a second direction, the second wiring is wired along the second direction, and the second loop is wired along the first direction, and the first direction is opposite to the second direction.

7. The non-contact voltage and current integrated measurement device for welding power devices according to claim 6, characterized in that: The through holes include four through hole groups, and one through hole group is arranged in each signal area; The through hole group includes a plurality of inner circle through holes and a plurality of outer circle through holes, and the number of the inner circle through holes is the same as the number of the outer circle through holes; The inner circle through holes are arranged along the inner edge of the substrate; in the four through hole groups, the inner circle through holes are arranged in a rectangular ring shape; The outer ring through holes are arranged along the outer edge of the substrate; in the four through hole groups, the outer ring through holes are arranged in a rectangular ring shape; In each of the through hole groups, the spacing between the inner circle through holes is the same as the spacing between the outer circle through holes; The through hole groups are symmetrically arranged in two opposite signal areas; The first loop and the second loop are arranged along the center line respectively, and in each of the signal areas, the distance from the inner circle through hole to the center line is equal to the distance from the outer circle through hole to the center line; In the direction of signal transmission: The tail end of the first upper signal line and the tail end of the second lower signal line are respectively connected to the inner circle through hole; The tail end of the first lower layer signal line and the tail end of the second upper layer signal line are respectively connected to the outer circle through holes.

8. The non-contact voltage and current integrated measurement device for welding power devices according to claim 6, characterized in that: The signal area includes a first signal area, a first signal area, and a second signal area, wherein the first signal area and the second signal area are located at two ends of the first signal area respectively; The connection area includes a first connection area and a second connection area, the first connection area is located between the first signal area and the first signal area, and the second connection area is located between the first signal area and the second signal area; In the direction of signal transmission: The first wiring enters the first signal area from the first connection area, passes through the first signal area, the second signal area and the first signal area in sequence to route the first signal line, in the first signal area, the first signal line is connected to the first loop line, and starts from the first signal area, passes through the second signal area and the first signal area in sequence, and then enters the first connection area to route the first loop line; The second wiring enters the first signal area from the second connection area, and the wiring of the second signal line is carried out through the first signal area, the first signal area and the second signal area in sequence. In the second signal area, the second signal line is connected to the second loop line, and the wiring of the second loop line starts from the second signal area, passes through the first signal area and the first signal area in sequence, and then enters the second connection area.

9. The non-contact voltage and current integrated measurement device for welding power devices according to claim 6, characterized in that: The shielding layer includes a first shielding layer and a second shielding layer. The first shielding layer is stacked and arranged outside the first signal layer, and the second shielding layer is stacked and arranged outside the second signal layer.

10. The non-contact voltage and current integrated measurement device for welding power devices according to claim 6, characterized in that: The calculation module includes an adder and a differentiator; The output value of the adder is a voltage-related quantity of the welding type power device, and the output value of the differentiator is a current-related quantity of the welding type power device.

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