Dual-channel integrated variable ratio transformer

Abstract

The present invention provides a dual-channel integrated variable ratio transformer, comprising a magnetic core, a primary coil and a secondary coil, wherein the magnetic core is a solid magnetic core, the magnetic core comprises a first magnetic core and a second magnetic core, the first magnetic core and the second magnetic core are arranged in parallel, the secondary coil comprises a first secondary coil and a second secondary coil, the first secondary coil and the second secondary coil are arranged between the first magnetic core and the second magnetic core, and the primary coil comprises a first primary coil and a second primary coil, the first primary coil and the second primary coil are arranged in parallel, the first primary coil comprises a first partial coil, the second primary coil comprises a second partial coil, the first partial coil and the second partial coil are between the first magnetic core and the second magnetic core. The present invention has the characteristics of a stable structure, being able to sample voltage or current signals of a dual-channel circuit to be detected, and conveniently adjusting the voltage or current ratio.

Description

Technical Field

[0001] The invention relates to the technical field of power electronic equipment detection, in particular to a dual-path integrated variable ratio mutual inductor. Background Art

[0002] In order to transmit circuits, power equipment often uses AC voltage and high current loops to send circuits to users, which cannot be directly measured by instruments. The role of the transformer is to reduce the AC voltage and high current ratio to a value that can be directly measured by instruments. Figure 1 As shown, the current transformer includes a primary coil 12, an iron core 10, a secondary coil 14, a primary current I1 and a secondary current I2. The iron core 10 is a ring-shaped closed structure, which is divided into a left half and a right half. The primary coil 12 surrounds the left half of the iron core 10, and the primary coil 12 is connected in series with the power supply line. The secondary coil 14 surrounds the right half of the iron core 10, and the secondary coil 14 is connected in series with a measuring instrument or a detection circuit. The primary coil has a number of turns N10, and the secondary coil has a number of turns N20, and the number of turns N10 is less than the number of turns N20. When working, a larger primary current I1 is input to the power supply line end, and the primary coil 12 samples the current I1, and then generates a secondary current I2 that is reduced in proportion to the number of turns through alternating magnetic flux induction, and then outputs it to an external current measuring instrument. Finally, the value of the secondary current I2 is measured, and the value of the primary current I1 is calculated by the current ratio determined according to the turns ratio, where the current ratio is N20 to N10. The structure of the voltage transformer is similar to that of the current transformer, except that the primary coil 12 is connected in parallel with the external power supply line and the secondary coil 14 is connected in parallel with an instrument or circuit for detecting voltage, and the number of turns of the primary coil is N20, the number of turns of the secondary coil is N10, the number of turns N10 is less than the number of turns N20, and the voltage ratio is N20 to N10.

[0003] It can be seen that the number of coil turns in the existing transformer structure is fixed, and the voltage ratio or current ratio is also fixed. Since the primary current or voltage is the circuit or voltage of the circuit to be detected, its value may change in different working periods. For the current or voltage transformer, the secondary current or voltage may be too small or too large, causing the measuring instrument to be inaccurate or burn out. In addition, most of the existing transformer structures are single-channel detection, and it is impossible to simultaneously detect the voltage or current of multiple circuits to be detected.

[0004] There are also ways to change the transformation ratio by adjusting the primary coil or the secondary coil. For example, Chinese invention patent application CN201310204306.4 discloses a method of changing the current ratio or voltage ratio by connecting a wire of a primary coil to the primary side terminal and changing the turns ratio between the primary coil and the secondary coil by changing the turns of the primary coil. However, in practical applications, the operation is not convenient and increases extra manpower and economic costs.

[0005] There is also a Chinese invention patent application CN200910095575.5 that discloses an integrated dual current transformer by stacking two identical units up and down. However, this direct stacking method makes its structure very unstable, and the upper and lower unit transformers are easily misaligned, which cannot be used in practical applications. Summary of the invention

[0006] The object of the present invention is to provide a dual-channel integrated variable ratio transformer which has a stable structure, can simultaneously sample voltage or current signals of two circuits to be detected, and can conveniently adjust the voltage or current ratio.

[0007] In order to achieve the above-mentioned purpose, the dual-channel integrated variable ratio transformer provided by the present invention includes a magnetic core, a primary coil and a secondary coil, the magnetic core is a solid magnetic core, the magnetic core includes a first magnetic core and a second magnetic core, the first magnetic core and the second magnetic core are arranged in parallel, the secondary coil includes a first secondary coil and a second secondary coil, the first secondary coil and the second secondary coil are arranged between the first magnetic core and the second magnetic core, and is characterized in that: the primary coil includes a first primary coil and a second primary coil, the first primary coil and the second primary coil are arranged in parallel, the first primary coil includes a first partial coil, the second primary coil includes a second partial coil, and the first partial coil and the second partial coil are between the first magnetic core and the second magnetic core.

[0008] It can be seen from the above scheme that by adding two primary coils within the magnetic field range between the first magnetic core and the second magnetic core, the two primary coils respectively receive the sampled current or voltage signals and then generate magnetism to form a magnetic field that can form two closed magnetic circuits with the magnetic fields of the first magnetic core and the second magnetic core. In addition, there are two secondary coils between the first magnetic core and the second magnetic core. After magnetism generates electricity, the sampled current or voltage signal can be output through the two secondary coils respectively, so that two mutual inductors can be formed. The two mutual inductors do not interfere with each other, and the voltage or current signals of the two circuits to be detected can be sampled simultaneously.

[0009] A preferred solution is that the first magnetic core is provided with a first central column, the second magnetic core is provided with a second central column, and the first central column and the second central column are bonded to each other.

[0010] It can be seen that the first magnetic core and the second magnetic core can be connected through two central columns, and the secondary coil can be wound around the two central columns connected together.

[0011] A further preferred solution is that the mutual inductor further comprises a frame, the frame comprises an upper surface, a middle portion and a lower surface, and the upper surface and the middle portion are between the first magnetic core and the second magnetic core.

[0012] It can be seen that a skeleton can be added outside the central column to facilitate the secondary coil to wrap around it, and the skeleton can play a role of connection and support to prevent the secondary coil from falling.

[0013] A further preferred solution is that the upper surface includes a first groove, and the first groove is engaged and connected with the first magnetic core.

[0014] It can be seen that the skeleton can be connected to the first magnetic core through the first groove to play a supporting role, so that the mutual inductor structure is stable.

[0015] A further preferred solution is that the lower surface includes a second groove, and the second groove is engaged and connected with the second magnetic core.

[0016] It can be seen that the skeleton can be connected to the second magnetic core through the second groove, so that the mutual inductor structure is stable.

[0017] A further preferred solution is that the first secondary coil and the second secondary coil are arranged around the middle portion, and the middle portion includes a central hole, and the central hole passes through the first central column and the second central column.

[0018] It can be seen that the secondary coil is wrapped around the middle part of the frame, and the central column is inserted into the middle part of the frame. The coil is still within the magnetic field range of the central column and can still perform electromagnetic induction.

[0019] A further solution is that the lower surface is provided with a first base foot, a second base foot, a third base foot and a fourth base foot, the first base foot, the second base foot, the third base foot and the fourth base foot are arranged in a rectangular shape, the first base foot is provided with a first through hole, the second base foot is provided with a second through hole, the third base foot is provided with a third through hole, and the fourth base foot is provided with a fourth through hole.

[0020] It can be seen that the frame is supported by four base feet, and can also be connected to other components of the transformer through the through holes on the base feet, further stabilizing the structure of the transformer.

[0021] A further solution is that the first primary coil includes a first coil leg and a second coil leg, and the first coil leg and the second coil leg are arranged in parallel.

[0022] It can be seen that the first primary coil has two coil legs arranged in parallel, which are connected to other components through the coil legs, further stabilizing the structure of the mutual inductor.

[0023] A further solution is that the second primary coil includes a third coil leg and a fourth coil leg, and the third coil leg and the fourth coil leg are arranged in parallel.

[0024] It can be seen that the second primary coil has two coil legs arranged in parallel, which are connected to other components through the coil legs, further stabilizing the structure of the transformer.

[0025] A further solution is that the first coil leg passes through the first through hole, the second coil leg passes through the second through hole, the third coil leg passes through the third through hole, and the fourth coil leg passes through the fourth through hole.

[0026] It can be seen that the frame is connected and fixed to the coil feet of the first primary coil and the second primary coil through the through holes on the base feet, making the mutual inductor structure more stable.

[0027] Preferably, a fifth signal pin is provided on the first coil pin, a sixth signal pin is provided on the second coil pin, a seventh signal pin is provided on the third coil pin, an eighth signal pin is provided on the fourth coil pin, and a first signal pin, a second signal pin, a third signal pin, a fourth signal pin and a ground pin are also provided on the lower surface.

[0028] It can be seen that the turns ratio between the primary coils and between the secondary coils can be changed by different connections of the signal pins, thereby realizing convenient adjustment of the voltage or current ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a current transformer in the prior art.

[0030] Figure 2 It is a structural decomposition diagram of an embodiment of a dual-channel integrated variable mutual inductor of the present invention.

[0031] Figure 3 It is a first-view structural diagram of an embodiment of a dual-channel integrated variable mutual inductor of the present invention.

[0032] Figure 4 It is a structural diagram from a second perspective of an embodiment of the dual-channel integrated variable mutual inductor of the present invention.

[0033] Figure 5 yes Figure 4 Cross-sectional view in the AA direction.

[0034] Figure 6 It is a structural diagram from a third perspective of an embodiment of a dual-channel integrated variable mutual inductor of the present invention.

[0035] Figure 7 It is a schematic diagram of the electrical principle of an embodiment of a dual-channel integrated variable mutual inductor of the present invention.

[0036] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0037] See also Figures 2 to 5 The dual-channel integrated variable ratio transformer of the present embodiment includes a first secondary coil 2, a second secondary coil 4, a first magnetic core 20, a first central column 21, a first protrusion 23, a second protrusion 24, a third groove 25, a fourth groove 27, a second magnetic core 30, a second central column 31, a third protrusion 33, a fourth protrusion 35, a fifth groove 37, a sixth groove 38, a first primary coil 40, a first partial coil 41, a first coil foot 42, a second coil foot 43, a fifth signal pin 85, a sixth signal pin 86, a second primary coil 45, a second partial coil Ring 46, third coil pin 47, fourth coil pin 48, seventh signal pin 87, eighth signal pin 88, magnetic core column 5, skeleton 50, upper surface 51, first groove 52, middle part 53, center hole 54, lower surface 55, second groove 56, first seat foot 61, second seat foot 62, third seat foot 63, fourth seat foot 64, secondary coil protection box 70, first insulating sleeve 72, second insulating sleeve 74, first signal pin 81, second signal pin 82, third signal pin 83 and fourth signal pin 84 and ground pin 89.

[0038] The first magnetic core 20 and the second magnetic core 30 are a pair of E-shaped solid magnetic cores, which are arranged in parallel and transversely. The first magnetic core 20 includes a first protrusion 23, a second protrusion 24, a first center column 21, a third groove 25 and a fourth groove 27, and the second magnetic core 30 includes a third protrusion 33, a fourth protrusion 35, a second center column 31, a fifth groove 37 and a sixth groove 38. There is a first cavity between the third groove 25 and the fourth groove 27, and there is a second cavity between the fifth groove 37 and the sixth groove 38. The first center column 21 and the second center column 31 are bonded together by glue or other materials to form a magnetic core column 5, and the first protrusion 23 and the third protrusion 33 and the second protrusion 24 and the fourth protrusion 35 are also fixedly bonded together by glue or other materials, so that the first magnetic core 20 and the second magnetic core 30 are firmly connected.

[0039] The first primary coil 40 and the second primary coil 45 are a pair of half-open coils arranged vertically in parallel, such as in a U shape, and the number of turns is half of that of a normal closed coil. The first primary coil 40 includes a first partial coil 41, a first coil foot 42 and a second coil foot 43, and the second primary coil 45 includes a second partial coil 46, a third coil foot 47 and a fourth coil foot 48. The first partial coil 41 is in the first cavity between the third groove 25 and the fourth groove 27, and the second partial coil 46 is in the second cavity between the fifth groove 37 and the sixth groove 38, wherein the first coil foot 42 and the second coil foot 43 are arranged in parallel, and the third coil foot 47 and the fourth coil foot 48 are arranged in parallel. It can be seen that after the first primary coil 40 is energized, a closed magnetic circuit can be formed between the magnetic field of the first partial coil 41 and the magnetic field of the magnetic core column 5, and after the second primary coil 45 is energized, a closed magnetic circuit can also be formed between the magnetic field of the second partial coil 46 and the magnetic field of the magnetic core column 5, and the two magnetic circuits do not interfere with each other. Furthermore, a first coil protection shell is provided outside the first primary coil 40 and covers the first part of the coil 41, the first insulating sleeve 72 is U-shaped, and a second insulating sleeve 74 is provided on the second primary coil 45 and covers the second part of the coil 46, the second insulating sleeve 74 is U-shaped, and the first insulating sleeve 72 and the second insulating sleeve 74 are arranged vertically in parallel. Furthermore, a fifth signal pin 85 is provided on the first coil pin 42, a sixth signal pin 86 is provided on the second coil pin 43, a seventh signal pin 87 is provided on the third coil pin 47, and an eighth signal pin 88 is provided on the fourth coil pin 48, wherein the signal pins are fixed to the coil pins by means of a patch, preferably, the fifth signal pin 85 and the sixth signal pin 86 are the signal input and output ends of the first primary coil 40, and the seventh signal pin 87 and the eighth signal pin 88 are the signal input and output ends of the second primary coil 45.

[0040] The skeleton 50 includes an upper surface 51, a middle portion 53 and a lower surface 55, and the upper surface 51, the middle portion 53 and the lower surface 55 are sequentially connected from top to bottom. The upper surface 51 is provided with a first groove 52, and the first magnetic core 20 is embedded in the first groove 52 from top to bottom. The lower surface 55 is provided with a second groove 56, and the second magnetic core 30 is embedded in the second groove 56 from bottom to top, so that the skeleton 50 is connected to the first magnetic core 20 and the second magnetic core 30 at the same time, so that the skeleton 50 is equivalent to a connecting piece between the first magnetic core 20 and the second magnetic core 30, so that the structure of the mutual inductor is more stable.

[0041] The middle part 53 is provided with a center hole 54, and the first intermediate column 21 can be inserted into the center hole 54 from top to bottom through the first groove 52, and the second intermediate column 31 can be inserted into the center hole 54 from bottom to top through the second groove 56, which is equivalent to the magnetic core column 5 being inserted into the middle part 53. Preferably, the middle part 53 is provided with a surrounding groove corresponding to the secondary coil, and the second secondary coil 4 and the second secondary coil 4 can be respectively surrounded on the middle part 53 through the corresponding surrounding grooves, so that the coil is not easy to fall off, and the coil is still within the magnetic field range of the magnetic core column 5, and can still perform electromagnetic induction with the magnetic field. A secondary coil protection box 70 is also provided outside the middle part 53, and the secondary coil protection box 70 covers the coil on the middle part 53 to protect the first secondary coil 2 and the second secondary coil 4.

[0042] The lower surface 55 is also provided with four outwardly extending base legs, namely a first base leg 61, a second base leg 62, a third base leg 63 and a fourth base leg 64. The four base legs are arranged in a rectangular shape to support the support frame 50. Figure 6 The first base leg 61 is provided with a first through hole 66, the second base leg 62 is provided with a second through hole 67, the third base leg 63 is provided with a third through hole 68, and the fourth base leg 64 has a fourth through hole 69. The first coil leg 42 passes through the first through hole 66, and the second coil leg 43 passes through the second through hole 67, so that the lower surface 55 and the first primary coil 40 are connected and fixed, and the structure of the mutual inductor is further stabilized. The third coil leg 47 passes through the third through hole 68, and the fourth coil leg 48 passes through the fourth through hole 69, so that the lower surface 55 and the second primary coil 45 are connected and fixed, and the structure of the mutual inductor is further stabilized.

[0043] The lower surface 55 is further provided with a first signal pin 81, a second signal pin 82, a third signal pin 83, a fourth signal pin 84 and a ground pin 89, which are arranged in parallel. Figure 6As shown, the first signal pin 81 and the second signal pin 82 are between the first base pin 61 and the third base pin 63, and the third signal pin 83, the fourth signal pin 84 and the ground pin 89 are between the second base pin 62 and the third base pin 63. Further, the first signal pin 81, the second signal pin 82, the third signal pin 83, the fourth signal pin 84, the fifth signal pin 85, the sixth signal pin 86, the seventh signal pin 87 and the eighth signal pin 88 are on the same plane. Among them, the first signal pin 81 and the second signal pin 82 are the signal output ends of the first secondary coil 2, the third signal pin 83 and the fourth signal pin 84 are the signal output ends of the second secondary coil 4, and the ground pin 89 is grounded at one end and connected to the first secondary coil 2 and the second secondary coil 4 at the other end for protecting the coil circuit.

[0044] See also Figure 7 , including a first primary side 6, a second primary side 7, a first secondary side 8, a second secondary side 9, and a magnetic core column 5. The first primary side 6 includes a first primary coil 40, a fifth signal pin 85, and a sixth signal pin 86. The second primary side 7 includes a second primary coil 45, a seventh signal pin 87, and an eighth signal pin 88. The first secondary side 8 includes a first secondary coil 2, a first signal pin 81, and a second signal pin 82. The second secondary side 9 includes a second secondary coil 4, a third signal pin 83, and a fourth signal pin 84. Among them, since the magnetic field of the magnetic core column 5 can form a closed magnetic circuit with the magnetic field of the first primary coil 40 after power-on and the magnetic field of the second primary coil 45 after power-on, the first primary side 6 can form a closed magnetic circuit with the secondary side of the first secondary side 8 or the second secondary side 9. Figure 1 The second primary side 7 can form another transformer with the first secondary side 8 or the second secondary side 9. Figure 1 The mutual inductor shown in the figure does not interfere with each other, further realizing a dual-channel integrated mutual inductor, which can simultaneously sample the voltage or circuit signal of two circuits to be detected, and can output the sampled signal to the detection instrument.

[0045] The first primary coil 40 and the second primary coil 45 can be made of copper bars, and the first secondary coil 2 and the second secondary coil 4 can be made of enameled wire. The first primary coil 40 has a number of turns N1, the second primary coil 45 has a number of turns N2, the first secondary coil 2 has a number of turns N3, and the second secondary coil 4 has a number of turns N4. When the dual-channel integrated transformer embodiment of the present invention is used as a current transformer, since the number of turns of the primary coil of the current transformer is less than the number of turns of the secondary coil, the number of turns N1 is set to 1, the number of turns N2 is set to 1, the number of turns N3 is set to 100, and the number of turns N4 is set to 500. Since the first primary coil 40 and the second primary coil 45 are semi-open coils, the number of turns is half of the closed coil. When sampling in two channels, a current ratio of 200:1 or 1000:1 can be achieved. During single-channel sampling, connecting the fifth signal pin 85 and the seventh signal pin 87 in series can achieve a current ratio of 100:1 or 500:1; connecting the second signal pin 82 and the fourth signal pin 84 in series can achieve a current ratio of 1200:1; connecting the fifth signal pin 85 and the sixth signal pin 86 in series while connecting the second signal pin 82 and the seventh signal pin 87 in series can achieve a current ratio of 600:1. When the dual-channel integrated transformer embodiment of the present invention is used as a voltage transformer, since the number of turns of the primary coil of the voltage transformer is greater than the number of turns of the secondary coil, the number of turns N1 is set to 100, the number of turns N2 is set to 500, the number of turns N3 is set to 1, and the number of turns N4 is set to 1. During dual-channel sampling, a voltage ratio of 200:1 or 1000:1 can be achieved; during single-channel sampling, the fifth signal pin 85 and the seventh signal pin 87 are connected in series to achieve a voltage ratio of 100:1 or 500:1; the second signal pin 82 and the fourth signal pin 84 are connected in series to achieve a voltage ratio of 1200:1; the fifth signal pin 85 and the sixth signal pin 86 are connected in series while the second signal pin 82 and the seventh signal pin 87 are connected in series to achieve a voltage ratio of 600:1.

[0046] This embodiment can not only realize the voltage or current signal sampling of the single-channel or dual-channel circuit to be detected, but also realize the adjustment of various voltage or current ratios by adjusting the number of turns of the secondary coil.

[0047] From the above, it can be seen that the dual-channel integrated variable mutual inductor embodiment of the present invention can realize dual-channel integration to perform voltage or current signal sampling on single-channel and dual-channel circuits to be detected, and can also realize the adjustment of a variety of different voltage or current ratios. The skeleton is used as the core component to connect the first magnetic core, the second magnetic core, the first primary coil and the second primary coil, so that the structure of the present invention is stable and can be directly applied in practice.

[0048] Finally, it should be emphasized that the present invention is not limited to the above-mentioned embodiments, and any connection relationship between the above-mentioned first magnetic core, second magnetic core, first primary coil and second primary coil to achieve dual-channel or multi-channel integration and adjustable voltage ratio or current ratio and similar effects are within the protection scope of the present invention.

Claims

1. A dual-channel integrated variable ratio transformer, comprising a magnetic core, a primary coil and a secondary coil, wherein the magnetic core is a solid magnetic core, the magnetic core comprises a first magnetic core and a second magnetic core, the first magnetic core and the second magnetic core are arranged in parallel, the secondary coil comprises a first secondary coil and a second secondary coil, the first secondary coil and the second secondary coil are arranged between the first magnetic core and the second magnetic core, Features: The primary coil includes a first primary coil and a second primary coil, the first primary coil and the second primary coil are arranged in parallel, the first primary coil includes a first partial coil, the second primary coil includes a second partial coil, and the first partial coil and the second partial coil are between the first magnetic core and the second magnetic core; The first primary coil comprises a first coil leg and a second coil leg, and the first coil leg and the second coil leg are arranged in parallel; the second primary coil comprises a third coil leg and a fourth coil leg, and the third coil leg is arranged in parallel with the fourth coil leg; wherein the turns ratio between the primary coils and the secondary coils is changed by different connections of the signal pins to adjust the voltage or current ratio; The first primary coil and the second primary coil are a pair of half-open coils arranged vertically, and the number of turns of the first primary coil and the second primary coil is half of that of a normal closed coil.

2. The dual-channel integrated variable ratio transformer according to claim 1, Features: The first magnetic core is provided with a first central column, the second magnetic core is provided with a second central column, and the first central column and the second central column are bonded to each other.

3. The dual-channel integrated variable ratio transformer according to claim 2, Features: The mutual inductor further includes a skeleton, and the skeleton includes an upper surface, a middle portion, and a lower surface, and the upper surface and the middle portion are between the first magnetic core and the second magnetic core.

4. The dual-channel integrated variable ratio transformer according to claim 3, Features: The upper surface includes a first groove, and the first groove is engaged and connected with the first magnetic core.

5. The dual-channel integrated variable ratio transformer according to claim 4, Features: The lower surface includes a second groove, and the second groove is engaged and connected with the second magnetic core.

6. The dual-channel integrated variable ratio transformer according to claim 5, Features: The first secondary coil and the second secondary coil are respectively disposed around the middle portion, and the middle portion includes a central hole, and the central hole passes through the first central column and the second central column.

7. The dual-channel integrated variable ratio transformer according to any one of claims 3 to 6, Features: The lower surface is provided with a first base foot, a second base foot, a third base foot and a fourth base foot, the first base foot, the second base foot, the third base foot and the fourth base foot are arranged in a rectangular shape, the first base foot is provided with a first through hole, the second base foot is provided with a second through hole, the third base foot is provided with a third through hole, and the fourth base foot is provided with a fourth through hole.

8. The dual-channel integrated variable ratio transformer according to claim 7, Features: The first coil leg passes through the first through hole, the second coil leg passes through the second through hole, the third coil leg passes through the third through hole, and the fourth coil leg passes through the fourth through hole.

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