CN113161130A - Structure for inhibiting common mode noise of novel transformer - Google Patents
Structure for inhibiting common mode noise of novel transformer Download PDFInfo
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- CN113161130A CN113161130A CN202110553002.3A CN202110553002A CN113161130A CN 113161130 A CN113161130 A CN 113161130A CN 202110553002 A CN202110553002 A CN 202110553002A CN 113161130 A CN113161130 A CN 113161130A
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- 230000002401 inhibitory effect Effects 0.000 title abstract description 7
- 238000004804 winding Methods 0.000 claims description 195
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 36
- 239000011889 copper foil Substances 0.000 claims description 32
- 230000002441 reversible effect Effects 0.000 claims description 21
- 230000010354 integration Effects 0.000 claims description 15
- 230000001629 suppression Effects 0.000 abstract description 3
- 230000002829 reductive effect Effects 0.000 description 21
- 208000032365 Electromagnetic interference Diseases 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000001939 inductive effect Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
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- 230000000670 limiting effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/33—Arrangements for noise damping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
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Abstract
The invention relates to the technical field of structures for inhibiting common-mode noise of a new transformer, and discloses a structure for inhibiting the common-mode noise of the new transformer, which comprises a first circuit, a second circuit and an LLC magnetic integrated transformer; the LLC magnetic integrated transformer is respectively connected with the first circuit and the second circuit. The invention provides a novel transformer common-mode noise suppression structure, which effectively reduces the common-mode noise of an LLC integrated transformer without influencing the leakage inductance and loss characteristics of the transformer.
Description
Technical Field
The invention relates to the field of structures for inhibiting common mode noise of a novel transformer, in particular to a structure for inhibiting the common mode noise of the novel transformer.
Background
With the rise of wide bandgap devices and the increase of switching frequency, EMI (electromagnetic interference) problems in switching power supplies, especially common mode EMI problems, become more and more serious. In order to suppress conducted EMI noise of a switching power supply, common mode EMI filters are widely added, electric field coupling between transformer windings is reduced, and coupling between devices is reduced. The shielding layer is an important technical means for reducing the electric field coupling between the transformers, and the lower cost is a preferred scheme for inhibiting the common-mode conducted EMI noise of the isolated switching power supply. The conventional transformer shield typically includes a shield between the primary and secondary windings, but this approach is not suitable for certain applications.
The LLC converter is widely applied to communication power supply, OBC and other application occasions due to the advantages of high efficiency, low EMI interference and the like. The topology of the LLC converter has a transformer and a resonant inductor. These two devices are the largest volume to weight ratio devices in an LLC converter. In order to reduce the size of the switching power supply and improve the power density, the leakage inductance of the transformer is controlled to be the resonant inductance of the LLC resonator in many application occasions, so as to realize the magnetic integration of the transformer and the resonant inductance. Among many LLC magnetic integration schemes, winding the primary winding and the secondary winding of an LLC transformer separately on a bobbin is the most common and simplest technical scheme.
Similar to a conventional isolated converter, the LLC transformer is also a key device that affects the common mode noise of the LLC converter. In the traditional scheme, in order to reduce the common mode noise of the transformer, namely, to reduce the electric field coupling between the primary side and the secondary side of the transformer, a shielding winding or a shielding copper foil is required to be added. The shielding structure such as a shielding winding or a shielding copper foil is often placed between the primary side and the secondary side, and the adjustment of the electric field coupling between the primary side and the secondary side is realized by adjusting the number of turns of the shielding winding or the size of the shielding layer, so that the suppression and optimization of the common-mode EMI of the transformer are realized. However, the LLC integrated magnetic part (transformer integrated with resonant inductor) with separate windings of the primary and secondary windings is not a pure transformer, and this structure has a large leakage magnetic field (mainly between the primary and secondary windings), which is used as the resonant inductor for the resonant circuit. If a traditional transformer shielding design method is adopted, the shielding structure is arranged between the primary winding and the secondary winding, and at the moment, the shielding body can generate great eddy current loss under the action of a leakage magnetic field, so that the leakage inductance parameter is changed (the leakage magnetic flux is reduced due to the eddy current demagnetization effect of the shielding body, the leakage inductance is reduced), and the heat and the efficiency are reduced. Therefore, the traditional transformer common mode noise shielding method is not suitable for common mode noise shielding of the LLC integrated transformer. The invention provides a novel structure for suppressing the common-mode noise of an LLC integrated transformer, optimizing the common-mode EMI (electro-magnetic interference) characteristic of an LLC, reducing the displacement current between an original secondary side and a transformer, and simultaneously not influencing the leakage inductance and the loss of the transformer.
Disclosure of Invention
Objects of the invention
In order to solve the technical problems in the background art, the invention provides a novel transformer common-mode noise suppression structure, which effectively reduces the common-mode noise of an LLC integrated transformer without influencing the leakage inductance and loss characteristics of the transformer.
(II) technical scheme
In order to solve the above problems, the present invention provides a structure for suppressing common mode noise of a new transformer, which comprises a first circuit, a second circuit and an LLC magnetic integrated transformer;
the LLC magnetic integrated transformer is respectively connected with the first circuit and the second circuit.
Preferably, the LLC magnetic integrated transformer includes a magnetic core symmetry axis, a magnetic core, a primary winding of the LLC magnetic integrated transformer, and a secondary winding A, LLC of the LLC magnetic integrated transformer, wherein a charge balancing copper foil is disposed on a side of the secondary winding a of the LLC magnetic integrated transformer near the upper magnetic jaw, and the charge balancing copper foil is connected to a primary side of the LLC magnetic integrated transformer.
Preferably, the LLC magnetic integrated transformer includes a magnetic core symmetry axis, a magnetic core, a primary winding of the LLC magnetic integrated transformer, a secondary winding A, LLC of the LLC magnetic integrated transformer, a primary winding of the LLC magnetic integrated transformer, a secondary winding a of the LLC magnetic integrated transformer and a secondary winding B of the LLC magnetic integrated transformer are respectively wound around a central pillar of the magnetic core, an additional reverse charge balancing winding is added to one side of the secondary winding a of the LLC magnetic integrated transformer and the secondary winding B of the LLC magnetic integrated transformer near the upper magnetic jaw, the reverse charge balancing winding is reversely coupled to the primary side of the transformer, and the reverse charge balancing winding C is connected to the primary side of the LLC magnetic integrated transformer.
Preferably, the LLC magnetic integrated transformer includes a magnetic core symmetry axis, a magnetic core, a primary winding of the LLC magnetic integrated transformer, a secondary winding A, LLC of the LLC magnetic integrated transformer, a primary winding of the LLC magnetic integrated transformer, and a secondary winding A, LLC of the LLC magnetic integrated transformer wound around a central core pillar, the secondary winding a of the LLC magnetic integrated transformer and the secondary winding B of the LLC magnetic integrated transformer are additionally provided with a charge balancing copper foil on a side near the upper magnetic jaw, a counter-coupled auxiliary winding is provided between the primary winding of the LLC magnetic integrated transformer and the central core pillar or between the primary winding of the LLC magnetic integrated transformer and the magnetic core pillar, and the auxiliary winding C is connected to the primary ground of the LLC magnetic integrated transformer.
The technical scheme of the invention has the following beneficial technical effects:
the common-mode noise of the LLC integrated transformer is effectively reduced, but the leakage inductance and loss characteristics of the transformer are not affected.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic view of the structure of the applied charge balance copper foil in embodiment 1 of the present invention.
FIG. 3 is a graph showing the induced charge distribution of the applied charge balance copper foil structure in example 1 of the present invention.
Fig. 4 is a schematic structural diagram of embodiment 2 of the present invention.
Fig. 5 is a schematic diagram of the application of the reverse charge balance winding in embodiment 2 of the present invention.
Fig. 6 is a diagram of induced charges by the additional reversed charge balance winding in embodiment 2 of the present invention.
Fig. 7 is another schematic diagram of the application of the reverse charge balance winding in embodiment 2 of the present invention.
Fig. 8 is a schematic diagram of an additional reversed charge balance winding in embodiment 2 of the present invention.
Fig. 9 is a schematic structural diagram of embodiment 3 of the present invention.
Fig. 10 shows one of the structures of the auxiliary winding and the charge balance copper foil in embodiment 3 of the present invention.
Fig. 11 shows a second structure of the auxiliary winding and the charge balance copper foil in embodiment 3 of the present invention.
FIG. 12 is a graph of the charge distribution of FIG. 10 according to the present invention.
FIG. 13 is a graph of the charge distribution of FIG. 11 according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings 1-13 in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example 1
Referring to fig. 1-3, a structure for suppressing common mode noise of a new transformer comprises a first circuit, a second circuit and an LLC magnetic integrated transformer;
the LLC magnetic integrated transformer is respectively connected with the first circuit and the second circuit.
The LLC magnetic integrated transformer comprises a magnetic core symmetry axis 300, a magnetic core 301, a primary winding 302 of the LLC magnetic integrated transformer, a secondary winding A303 of the LLC magnetic integrated transformer and a secondary winding B304 of the LLC magnetic integrated transformer, wherein a charge balance copper foil 305 is arranged on one side, close to a magnetizing jaw, of the secondary winding A303 of the LLC magnetic integrated transformer, and the charge balance copper foil 305 is connected with a primary side ground of the LLC magnetic integrated transformer.
It should be noted that, the distance from the charge balance copper foil 305 to the coil is x, the width is SW, at this time, the total inductive charge amount on the secondary winding a303 of the LLC magnetic integrated transformer and the secondary winding B304 of the LLC magnetic integrated transformer can be adjusted by adjusting two parameters, namely, the distance x from the charge balance copper foil to the coil and the width SW thereof, and when the total inductive charge amount on the secondary winding a303 of the LLC magnetic integrated transformer and the secondary winding B304 of the LLC magnetic integrated transformer is 0, the common mode noise of the LLC magnetic integrated transformer is 0, that is, the common mode noise of the LLC magnetic integrated transformer can be realized.
It should be noted that the principle analysis is as follows:
referring to fig. 2-3, in fig. 2, the number of turns of the primary winding is greater than that of the secondary winding a of the LLC magnetic integrated transformer and that of the secondary winding B of the LLC magnetic integrated transformer, so that the voltage of the primary winding is higher than that of the secondary winding a of the LLC magnetic integrated transformer and that of the secondary winding B of the LLC magnetic integrated transformer, and then negative charges Q1 are induced on the secondary winding a of the LLC magnetic integrated transformer and that of the secondary winding B of the LLC magnetic integrated transformer, as shown in fig. 3, and these charges generate common mode noise current. If the charge in this portion can be reduced, the common mode noise of the LLC magnetic integrated transformer is reduced. At the moment, a charge balance copper foil is added above a secondary winding A of the LLC magnetic integrated transformer and at a top magnetic jaw, the width of the charge balance copper foil and the distance between the charge balance copper foil and a secondary winding B of the LLC magnetic integrated transformer can be adjusted, and the charge balance copper foil is connected to the original side of the transformer. Because the potential of the secondary winding A of the LLC magnetic integrated transformer is higher than that of the charge balance copper foil, positive charges Q2 are induced on the secondary winding A of the LLC magnetic integrated transformer, and negative charges are induced on the charge balance copper foil. At the moment, the total induced charges on the secondary winding A of the LLC magnetic integrated transformer and the secondary winding B of the LLC magnetic integrated transformer are (Q1-Q2), the induced charges are reduced, and when the width and the position of the charge balance copper foil are proper, the induced charges on the secondary winding A of the LLC magnetic integrated transformer and the secondary winding B of the LLC magnetic integrated transformer can be 0, so that the common-mode noise current in a circuit can be reduced, and the electromagnetic interference is reduced. Meanwhile, the charge balance copper foil is positioned below the upper magnetic jaw, and the magnetic field at the position is basically zero, so that no induced eddy current exists on the charge balance copper foil, and the leakage inductance and loss of the LLC magnetic integrated transformer cannot be influenced.
Example 2
Referring to fig. 4-8, a structure for suppressing common mode noise of a new transformer comprises a first circuit, a second circuit and an LLC magnetic integrated transformer;
the LLC magnetic integrated transformer is respectively connected with the first circuit and the second circuit.
The LLC magnetic integrated transformer comprises a magnetic core symmetry axis 400, a magnetic core 401, a primary winding 402 of the LLC magnetic integrated transformer, a secondary winding A403 of the LLC magnetic integrated transformer, a secondary winding B404 of the LLC magnetic integrated transformer, the primary winding 402 of the LLC magnetic integrated transformer, the secondary winding A403 of the LLC magnetic integrated transformer and the secondary winding B404 of the LLC magnetic integrated transformer are respectively wound on a magnetic core center post, an additional reverse charge balance winding 405 is added to one side, close to an upper magnetic jaw, of the secondary winding A403 of the LLC magnetic integrated transformer and one side, close to the upper magnetic jaw, of the secondary winding B404 of the LLC magnetic integrated transformer, the reverse charge balance winding 405 is reversely coupled with the primary side of the transformer, and the reverse charge balance winding C0 is connected with the primary side ground of the LLC magnetic integrated transformer.
It should be noted that, the distance between the reverse charge balance winding 405 and the coil is x, the number of turns is n2, at this time, the total inductive charge amount on the secondary winding a403 of the LLC magnetic integrated transformer and the secondary winding B404 of the LLC magnetic integrated transformer can be adjusted by adjusting two parameters, namely, the distance x between the secondary winding a403 of the LLC magnetic integrated transformer and the secondary winding B404 of the LLC magnetic integrated transformer, and the number of turns n2 thereof, when the total inductive charge amount on the secondary winding a403 of the LLC magnetic integrated transformer and the secondary winding B404 of the LLC magnetic integrated transformer is 0, the common mode noise of the LLC magnetic integrated transformer is 0, and the common mode noise of the LLC magnetic integrated transformer can be realized.
It should be noted that the principle analysis is as follows:
in fig. 5, the number of turns of the primary winding is greater than that of the secondary winding a403 of the LLC magnetic integrated transformer and the secondary winding B404 of the LLC magnetic integrated transformer, so that the voltage of the primary winding is higher than that of the secondary winding a403 of the LLC magnetic integrated transformer and the secondary winding B404 of the LLC magnetic integrated transformer, and then negative charges Q1 are induced on the secondary winding a403 of the LLC magnetic integrated transformer and the secondary winding B404 of the LLC magnetic integrated transformer, as shown in fig. 6, and these charges generate common-mode noise current. If the charge in this portion can be reduced, the common mode noise of the LLC magnetic integrated transformer is reduced. At the moment, reverse charge balance windings are added above a secondary winding A403 of the LLC magnetic integration transformer and a secondary winding B404 of the LLC magnetic integration transformer and above a top magnetic jaw, the number of turns of the reverse charge balance windings and the distance between the reverse charge balance windings and the secondary windings are adjustable, and C0 of the reverse charge balance windings is connected to the primary side of the transformer. A negative voltage is induced on the reversed charge balance winding C1, and the magnitude of the voltage is: -1V to-n 2. Because the potentials of the secondary winding A403 of the LLC magnetic integration transformer and the secondary winding B404 of the LLC magnetic integration transformer are mostly higher than the potential of the reverse charge balance winding, positive charges Q2 can be induced on the secondary winding A403 of the LLC magnetic integration transformer and the secondary winding B404 of the LLC magnetic integration transformer, and negative charges can be induced on the reverse charge balance winding. At this time, the total induced charges on the secondary winding A403 of the LLC magnetic integrated transformer and the secondary winding B404 of the LLC magnetic integrated transformer are (Q1-Q2), the induced charges are reduced, and when the number of turns of the charge balance winding and the distance between the charge balance winding and the secondary winding are proper, the induced charges on the secondary winding A403 of the LLC magnetic integrated transformer and the secondary winding B404 of the LLC magnetic integrated transformer can be 0, so that the common-mode noise current in the circuit can be reduced, and the electromagnetic interference can be reduced. Because the charge balance winding is not closed, no power current exists on the charge balance winding, a very thin wire can be adopted, no induced eddy current exists on the charge balance winding, and the leakage inductance and loss of the LLC magnetic integrated transformer cannot be influenced.
The reverse charge balance winding can be placed between the secondary winding and the center leg using the same principle, as shown in fig. 7. It is also possible to place an opposite charge balancing winding between the secondary winding and the outer leg as shown in fig. 8.
Example 3
Referring to fig. 9-13, a structure for suppressing common mode noise of a new transformer comprises a first circuit, a second circuit and an LLC magnetic integrated transformer;
the LLC magnetic integrated transformer is respectively connected with the first circuit and the second circuit.
The LLC magnetic integrated transformer comprises a magnetic core symmetry axis 500, a magnetic core 501, a primary winding 502 of the LLC magnetic integrated transformer, a secondary winding A503 of the LLC magnetic integrated transformer, a secondary winding B504 of the LLC magnetic integrated transformer, the primary winding 502 of the LLC magnetic integrated transformer, the secondary winding A503 of the LLC magnetic integrated transformer and the secondary winding B504 of the LLC magnetic integrated transformer are wound on a central core column respectively, a charge balance copper foil 505 is additionally arranged on one side, close to a magnetic jaw, of the secondary winding A503 of the LLC magnetic integrated transformer and one side, close to the magnetic jaw, of the secondary winding B504 of the LLC magnetic integrated transformer, a reversely coupled auxiliary winding 506 is arranged between the primary winding 502 of the LLC magnetic integrated transformer and the central core column or between the primary winding 502 of the LLC magnetic integrated transformer and the magnetic core column, and the auxiliary winding C0 is connected with a primary side of the LLC magnetic integrated transformer.
It should be noted that, the distance between the charge balance copper foil 505 and the secondary winding a503 of the LLC magnetic integrated transformer and the secondary winding B504 of the LLC magnetic integrated transformer is x, and the number of turns of the auxiliary winding 506 is n2, at this time, the total inductive charge amount on the secondary winding a503 of the LLC magnetic integrated transformer and the secondary winding B504 of the LLC magnetic integrated transformer can be adjusted by adjusting two parameters, namely, the distance between the charge balance copper foil 505 and the secondary winding a503 of the LLC magnetic integrated transformer and the secondary winding B504 of the LLC magnetic integrated transformer is x, and the number of turns of the auxiliary winding 506 is n2, when the total inductive charge amount on the secondary winding a503 of the LLC magnetic integrated transformer and the secondary winding B504 of the LLC magnetic integrated transformer is 0, the common mode noise of the LLC magnetic integrated transformer is 0, and the common mode noise-free design of the LLC magnetic integrated transformer can be realized.
It should be noted that the principle analysis is as follows:
referring to fig. 10, the number of turns of the primary winding is greater than that of the secondary winding 1 and the secondary winding 2, so that the voltage of the primary winding is higher than that of the secondary winding a503 of the LLC magnetic integrated transformer and that of the secondary winding B504 of the LLC magnetic integrated transformer, and thus negative charges Q1 are induced on the secondary winding a503 of the LLC magnetic integrated transformer and that of the secondary winding B504 of the LLC magnetic integrated transformer, which may generate common mode noise current as shown in fig. 12 and 13. If the charge in this portion can be reduced, the common mode noise of the LLC magnetic integrated transformer is reduced. At the moment, a charge balance copper foil is added above a secondary winding A503 of the LLC magnetic integration transformer and a secondary winding B504 of the LLC magnetic integration transformer and above a top magnetic jaw, the charge balance copper foil is connected with a C1 of an auxiliary winding, and a C0 of the auxiliary winding is connected with a primary side of the transformer. At this time, the voltage across the auxiliary winding C1 was-n 2 volts, so the charge balance copper foil was also-n 2 volts. Since the potentials of the secondary winding a503 and the secondary winding B504 of the LLC magnetic integrated transformer are mostly higher than the potential of the reverse charge balance winding, a positive charge Q2 is induced on the secondary winding a503 and the secondary winding B504 of the LLC magnetic integrated transformer, and a negative charge is induced on the reverse charge balance winding. At this time, the total induced charges on the secondary winding A503 of the LLC magnetic integration transformer and the secondary winding B504 of the LLC magnetic integration transformer are (Q1-Q2), the induced charges are reduced, and when the number of turns and the position of the charge balance winding are proper, the induced charges on the secondary winding A503 of the LLC magnetic integration transformer and the secondary winding B504 of the LLC magnetic integration transformer can be 0, so that the common mode noise current in the circuit can be reduced, and the electromagnetic interference can be reduced. Because the auxiliary winding is not closed, no power current exists on the auxiliary winding, a very thin wire can be adopted, no induced eddy current exists on the wire, and the leakage inductance and loss of the LLC magnetic integrated transformer cannot be influenced. Meanwhile, the charge balance copper foil is positioned below the upper magnetic jaw, and the magnetic field at the position is basically zero, so that no induced eddy current exists on the charge balance copper foil, and the leakage inductance and loss of the LLC magnetic integrated transformer cannot be influenced.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (4)
1. A structure for suppressing common mode noise of a new transformer is characterized by comprising a first circuit, a second circuit and an LLC magnetic integrated transformer;
the LLC magnetic integrated transformer is respectively connected with the first circuit and the second circuit.
2. The structure for suppressing the common mode noise of the novel transformer according to claim 1, wherein the LLC magnetic integrated transformer comprises a magnetic core symmetry axis (300), a magnetic core (301), a primary winding (302) of the LLC magnetic integrated transformer, a secondary winding a (303) of the LLC magnetic integrated transformer, and a secondary winding B (304) of the LLC magnetic integrated transformer, wherein a charge balance copper foil (305) is disposed on a side of the secondary winding a (303) of the LLC magnetic integrated transformer near the upper magnetic jaw, and the charge balance copper foil (305) is connected to a primary ground of the LLC magnetic integrated transformer.
3. A new transformer common mode noise rejection structure according to claim 1, characterized by the LLC magnetic integrated transformer comprising a core symmetry axis (400), a core (401), a primary winding (402) of the LLC magnetic integrated transformer, the secondary winding A (403) of the LLC magnetic integrated transformer, the secondary winding B (404) of the LLC magnetic integrated transformer, the primary winding (402) of the LLC magnetic integrated transformer, the secondary winding A (403) of the LLC magnetic integrated transformer and the secondary winding B (404) of the LLC magnetic integrated transformer are respectively wound on a center pillar of a magnetic core, an additional reverse charge balance winding (405) is added to one side, close to an upper magnetic jaw, of the secondary winding A (403) of the LLC magnetic integrated transformer and one side, close to the upper magnetic jaw, of the secondary winding B (404) of the LLC magnetic integrated transformer, the reverse charge balance winding (405) is reversely coupled with the primary side of the transformer, and the reverse charge balance winding C0 is connected with the primary side of the LLC magnetic integrated transformer.
4. The structure for suppressing the common mode noise of the new transformer according to claim 1, wherein the LLC magnetic integrated transformer comprises a magnetic core symmetry axis (500), a magnetic core (501), a primary winding (502) of the LLC magnetic integrated transformer, a secondary winding A (503) of the LLC magnetic integrated transformer, a secondary winding B (504) of the LLC magnetic integrated transformer, a primary winding (502) of the LLC magnetic integrated transformer, a secondary winding A (503) of the LLC magnetic integrated transformer, and a secondary winding B (504) of the LLC magnetic integrated transformer wound around a center pillar of the magnetic core, a charge balancing copper foil (505) added on one side of the secondary winding A (503) of the LLC magnetic integrated transformer and one side of the secondary winding B (504) of the LLC magnetic integrated transformer near a top magnetic jaw, an auxiliary winding (506) reversely coupled is arranged between the primary winding (502) of the LLC magnetic integrated transformer and the center pillar of the magnetic core or between the primary winding (502) of the LLC magnetic integrated transformer and the side pillar of the magnetic integrated transformer, and the auxiliary winding C0 is connected with the primary side ground of the LLC magnetic integration transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110553002.3A CN113161130A (en) | 2021-05-20 | 2021-05-20 | Structure for inhibiting common mode noise of novel transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110553002.3A CN113161130A (en) | 2021-05-20 | 2021-05-20 | Structure for inhibiting common mode noise of novel transformer |
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| CN113161130A true CN113161130A (en) | 2021-07-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024113100A1 (en) * | 2022-11-28 | 2024-06-06 | Innoscience (suzhou) Semiconductor Co., Ltd. | Power converter and electronic device charger |
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| CN2720589Y (en) * | 2004-07-27 | 2005-08-24 | 特变电工衡阳变压器有限公司 | Magnetic shielding structure of inductor with magnetic core |
| CN1866422A (en) * | 2005-05-17 | 2006-11-22 | 特变电工衡阳变压器有限公司 | Magnetic shielding structure for reactor with magnetic core |
| CN105444877A (en) * | 2015-12-29 | 2016-03-30 | 保定天威保变电气股份有限公司 | Shunt reactor equivalent model for electromagnetic vibration noise tests |
| CN108831716A (en) * | 2018-08-07 | 2018-11-16 | 江苏宏源电气有限责任公司 | A dry-type transformer insulation structure |
| CN111902895A (en) * | 2018-08-06 | 2020-11-06 | 谷歌有限责任公司 | Shielded power transformer |
-
2021
- 2021-05-20 CN CN202110553002.3A patent/CN113161130A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2720589Y (en) * | 2004-07-27 | 2005-08-24 | 特变电工衡阳变压器有限公司 | Magnetic shielding structure of inductor with magnetic core |
| CN1866422A (en) * | 2005-05-17 | 2006-11-22 | 特变电工衡阳变压器有限公司 | Magnetic shielding structure for reactor with magnetic core |
| CN105444877A (en) * | 2015-12-29 | 2016-03-30 | 保定天威保变电气股份有限公司 | Shunt reactor equivalent model for electromagnetic vibration noise tests |
| CN111902895A (en) * | 2018-08-06 | 2020-11-06 | 谷歌有限责任公司 | Shielded power transformer |
| CN108831716A (en) * | 2018-08-07 | 2018-11-16 | 江苏宏源电气有限责任公司 | A dry-type transformer insulation structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024113100A1 (en) * | 2022-11-28 | 2024-06-06 | Innoscience (suzhou) Semiconductor Co., Ltd. | Power converter and electronic device charger |
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