CN110581008A - Radio frequency transformer and electric appliance - Google Patents
Radio frequency transformer and electric appliance Download PDFInfo
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- CN110581008A CN110581008A CN201910868975.9A CN201910868975A CN110581008A CN 110581008 A CN110581008 A CN 110581008A CN 201910868975 A CN201910868975 A CN 201910868975A CN 110581008 A CN110581008 A CN 110581008A
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- 238000004804 winding Methods 0.000 claims abstract description 184
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- 238000000576 coating method Methods 0.000 claims description 5
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 claims description 4
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229920001342 Bakelite® Polymers 0.000 description 1
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Classifications
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
-
- 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
the invention relates to the technical field of transformers, and provides a radio-frequency transformer and an electric appliance, which comprise a magnetic core, a primary coil, a first secondary coil and a second secondary coil, wherein the primary coil is formed by winding a first conducting wire; the first conducting wire comprises a first winding section and a second winding section connected with the first winding section, the first winding section and the second winding section are wound on the magnetic core in a staggered mode along opposite directions, the second conducting wire is wound on the magnetic core along the winding direction of the first winding section, and the third conducting wire is wound on the magnetic core along the winding direction of the second winding section. According to the radio frequency transformer and the electrical appliance provided by the invention, the second lead and the third lead are respectively wound on the magnetic core along the first winding section and the second winding section in a staggered manner along the reverse direction, so that the similarity of the first winding section and the second winding section is higher, and the signal intensity can be uniformly distributed while the transmission loss is reduced.
Description
Technical Field
the invention belongs to the technical field of transformers, and particularly relates to a radio frequency transformer and an electric appliance.
Background
The radio frequency transformer works by combining the electromagnetic induction principle and the transmission line principle. One winding mode of the existing wire-wound transformer is that the primary and the secondary are wound separately, and the other winding mode is that the primary and the secondary are wound in a double-wire parallel winding mode. The transformer wound by the first winding mode has large stray capacitance, so that the insertion loss value is large, and the transmission efficiency of a product is influenced; the transformer wound by the second winding method has large resistance difference and capacitance difference between output ends, large amplitude balance value and phase balance value, so that signal strength cannot be evenly distributed, and large fluctuation of a phase shift amount of a signal between an output port and an input port occurs, thereby affecting transmission of signal energy. Both transformers do not distribute the signal strength evenly while reducing transmission losses.
Disclosure of Invention
The present invention is directed to a radio frequency transformer, including but not limited to a transformer for solving the technical problem of the prior art that the transformer cannot equally distribute the signal strength while reducing the transmission loss.
In order to solve the above technical problem, an embodiment of the present invention provides a radio frequency transformer, including a magnetic core, a primary coil, a first secondary coil, and a second secondary coil, where the primary coil is formed by winding a first wire, the first secondary coil is formed by winding a second wire, and the second secondary coil is formed by winding a third wire; the first conducting wire comprises a first winding section and a second winding section connected with the first winding section, the first winding section and the second winding section are wound on the magnetic core in a staggered mode along opposite directions, the second conducting wire is wound on the magnetic core along the winding direction of the first winding section, and the third conducting wire is wound on the magnetic core along the winding direction of the second winding section.
Further, the first winding section and the second conductor form a twisted pair structure, and the second winding section and the third conductor form a twisted pair structure.
Furthermore, two winding holes through which the first winding section and the second winding section alternately pass are formed in the magnetic core, and the connecting positions of the first winding section and the second winding section are located on a symmetrical plane between the two winding holes.
Furthermore, an insulating coating is arranged outside the magnetic core, and a chamfer is arranged on the edge of the magnetic core.
Further, the magnetic core is manganese-zinc ferrite.
Further, the radio frequency transformer further comprises a shell for supporting the magnetic core, and a plurality of end electrodes which are respectively connected with two ends of the primary coil, two ends of the first secondary coil and two ends of the second secondary coil are arranged on the shell.
Optionally, one end of the first secondary coil near the position where the first winding section is connected with the second winding section extends outwards to form a first lead, and the other end of the first secondary coil extends outwards to form a second lead; one end of the second secondary coil, which is close to the connecting position of the first winding section and the second winding section, extends outwards to form a third lead wire, and the other end of the second secondary coil extends outwards to form a fourth lead wire; the second lead and the fourth lead are connected to the same terminal electrode.
Optionally, one end of the first secondary coil near the position where the first winding section is connected with the second winding section extends outwards to form a first lead, and the other end of the first secondary coil extends outwards to form a second lead; one end of the second secondary coil, which is close to the connecting position of the first winding section and the second winding section, extends outwards to form a third lead wire, and the other end of the second secondary coil extends outwards to form a fourth lead wire; the first lead and the third lead are connected to the same terminal electrode.
Further, the terminal electrode outer layer is gold-plated.
The invention also provides an electric appliance comprising the radio frequency transformer.
the radio frequency transformer and the electric appliance provided by the invention adopt the first winding section and the second winding section to be reversely wound on the magnetic core in a staggered manner, the first secondary coil is wound on the magnetic core along the winding direction of the first winding section, and the second secondary coil is wound on the magnetic core along the winding direction of the second winding section, so that the similarity of the first winding section and the second winding section is higher, the first secondary coil and the second secondary coil are subjected to double-wire winding with the first winding section and the second winding section of the primary coil at the same time, and the positions, the sizes and the shapes of the first secondary coil, the first winding section, the second secondary coil and the second winding section wound on the magnetic core in the same turn are basically consistent, thereby reducing the transmission loss and realizing the average distribution of the signal intensity.
Drawings
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of a radio frequency transformer according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of a stranded wire structure formed by a first conductive wire and a second conductive wire according to an embodiment of the present invention;
Fig. 3 is a schematic diagram of a stranded wire structure formed by a first conducting wire, a second conducting wire and a third conducting wire according to an embodiment of the present invention;
FIG. 4 is a schematic view of a coil winding according to an embodiment of the present invention during turns 1-2;
FIG. 5 is a schematic view of a coil winding according to an embodiment of the present invention during turns 2-3;
FIG. 6 is a schematic diagram of a coil and core provided by an embodiment of the present invention;
FIG. 7 is a front view of a magnetic core provided by an embodiment of the present invention;
Fig. 8 is a bottom view of a rf transformer according to an embodiment of the present invention;
Fig. 9 is a top view of a radio frequency transformer according to an embodiment of the present invention;
fig. 10 is a test chart of the rf transformer according to the embodiment of the present invention;
fig. 11 is a test chart of an rf transformer in a conventional product.
Wherein, in the figures, the respective reference numerals:
10-magnetic core, 101-winding hole, 21-primary coil, 210-first conducting wire, 211-first winding section, 212-second winding section, 22-first secondary coil, 220-second conducting wire, 2211-first lead, 2212-second lead, 23-second secondary coil, 230-third conducting wire, 2311-third lead, 2312-fourth lead, 31-shell, 32-terminal electrode.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 4 to fig. 6, a description will now be given of the rf transformer according to the present invention. The rf transformer includes a core 10 (see also fig. 7), a primary coil 21, a first secondary coil 22, and a second secondary coil 23. The primary coil 21 is formed by winding a first conductive wire 210 (see fig. 2), the first secondary coil 22 is formed by winding a second conductive wire 220 (see fig. 2), and the second secondary coil 23 is formed by winding a third conductive wire 230 (see fig. 3). The first conductive wire 210 includes a first winding section 211 and a second winding section 212, the first winding section 211 and the second winding section 212 are connected, and the first winding section 211 and the second winding section 212 are alternately wound on the magnetic core 10 in opposite directions. The second conductive wire 220 is wound around the magnetic core 10 in the winding direction of the first winding section 211, and the third conductive wire 230 is wound around the magnetic core 10 in the winding direction of the second winding section 212. Namely: when the first winding section 211 winds half turn, the second winding section 212 winds half turn in the reverse direction, and the unwound part of the first winding section 211 intersects the unwound part of the second winding section 212; continuing to wind the first winding section 211 for one turn, the second winding section 212 is reversely wound for one turn, and the two non-winding portions intersect again; the winding is performed layer by layer in this order until the primary coil 21 and the secondary coil are completely wound. This enables each turn of the first secondary winding 22 to be sized and positioned close to the corresponding turn of the second secondary winding 23, resulting in a high uniformity and symmetry of the first primary winding 21 and the second primary winding 21. When a primary coil and a secondary coil in the prior art are wound in a double-wire mode, the primary coil and the secondary coil are turned from inside to outside to be enlarged, so that one secondary coil is located on the inner side of the other secondary coil, the winding diameter difference of the two secondary coils is large, magnetic fluxes in the two secondary coils inside and outside the two secondary coils are inconsistent, and the distribution of signal energy is uneven. In the radio frequency transformer of the present application, the primary coil 21 is divided into the first winding section 211 and the second winding section 212, and the first conducting wire 210 is wound from the middle to the two ends one by one, that is, the first winding section 211 and the second winding section 212 are wound simultaneously, and the winding diameters of the two parts are enlarged simultaneously, so that the primary coil 21 has good symmetry of the two sections. The first secondary coil 22 and the first winding section 211 are wound in a double-wire parallel mode, the second secondary coil 23 and the second winding section 212 are wound in a double-wire parallel mode, so that the first secondary coil 22 and the first winding section 211 form an approximately same coil structure, the second secondary coil 23 and the second winding section 212 also form an approximately same coil structure, the sizes of the first secondary coil 22 and the second secondary coil 23 are approximate (approximately mirror symmetry), the resistance and the capacitance in the first secondary coil 22 and the second secondary coil 23 are approximately consistent, the amplitude balance value and the phase balance value are small, signals can be evenly distributed in the radio frequency transformer, and the same turns between the first primary coil 21 and the second primary coil 21 correspond together, so that the phase shift fluctuation amplitude of the signals between the output ports and the input ports is reduced. Therefore, the radio frequency transformer ensures more balanced signal distribution while reducing transmission loss.
Further, referring to fig. 2 and fig. 3 together, as an embodiment of the rf transformer provided by the embodiment of the present invention, the first winding section 211 and the second conductive line 220 form a twisted pair structure, and the second winding section 212 and the third conductive line 230 form a twisted pair structure, so that during the winding process of the first winding section 211 and the second winding section 212, the second conducting wire 220 is consistent with the first winding section 211, and the third conducting wire 230 is consistent with the second winding section 212, so that the consistency of the positions and the sizes of the second conducting wire 220 and the first winding section 211 and the consistency of the positions and the sizes of the third conducting wire 230 and the second winding section 212 are ensured on one hand, the winding of the first conducting wire 210, the second conducting wire 220 and the third conducting wire 230 is facilitated, and the separation of the second conducting wire 220 from the first winding section 211 or the separation of the third conducting wire 230 from the second winding section 212 in the winding process is avoided.
Of course, the first winding section 211 and the second conductive line 220 form a double-row structure, and the second winding section 212 and the third conductive line 230 form a double-row structure, which has the advantages of reducing the lengths of the first conductive line 210, the second conductive line 220 and the third conductive line 230 and reducing the inter-turn gap.
Furthermore, the first conductive wire 210 can be fixed with the second conductive wire 220 and the third conductive wire 230 by a glue layer or a lacquer coating between the twisted pair structure or the double-row structure, so as to prevent the second conductive wire 220 from being separated from the first winding section 211 or the third conductive wire 230 from being separated from the second winding section 212 during the winding process.
Preferably, the first wire 210, the second wire 220 and the third wire 230 are H-grade polyurethane enameled copper wires, and the H-grade polyurethane enameled copper wires have excellent insulating property on one hand, and can avoid electric leakage or disconnection among turns. Meanwhile, the paint layers of the surface layers of the first, second and third conductive lines 210, 220 and 230 can be made uniform, so that the difference between the capacitance of the first secondary winding 22 and the first winding section 211 and the capacitance of the second secondary winding 23 and the second winding section 212 is small.
Further, referring to fig. 4 to 6 together, as a specific embodiment of the rf transformer according to the embodiment of the present invention, two winding holes 101 are formed on the magnetic core 10 (refer to fig. 7 together), the first winding segment 211 and the second winding segment 212 alternately pass through the two winding holes 101 in opposite directions, and a position where the first winding segment 211 and the second winding segment 212 are connected is located on a symmetrical plane between the two winding holes 101. The two winding holes 101 are adopted, so that the positions of the first winding section 211 and the second winding section 212 are convenient to position during winding, and the position and the size of the first winding section 211 and the second winding section 212 can be close to each other. The positioning of the connection position of the first winding section 211 and the second winding section 212 on the symmetry plane of the two winding holes 101 facilitates the lead-in of the primary coil 21 and the secondary coil on the one hand and the control of the connection position (i.e., the start position) of the first winding section 211 and the second winding section 212 on the other hand, ensuring the positioning of the first winding section 211 and the second winding section 212.
Preferably, the magnetic core 10 has a symmetrical structure, and the magnetic core 10 has a symmetrical structure, so that the situation that the positions of the two ends of the primary coil 21 are asymmetrical or the positions of the two ends of the first secondary coil 22 and the two ends of the second secondary coil 23 are asymmetrical, which affects the amplitude balance value and the phase balance value of the rf transformer, can be avoided.
In an advanced manner, an insulating coating is arranged outside the magnetic core 10, and the insulating coating can block the first conducting wire 210, the second conducting wire 220 and the third conducting wire 230, so that the coil is prevented from being conducted with the magnetic core 10 under the action of high-frequency current, and the coil is prevented from being short-circuited.
Preferably, the edge of the magnetic core 10 is provided with a chamfer, and the chamfer can prevent the first wire 210, the second wire 220 and the third wire 230 from being scratched by the magnetic core 10 in the winding process, so as to prevent the damage of the insulating layer from affecting the performance of the coil.
Preferably, the second and third wires 220 and 230 are wound on the magnetic core 10 with equal lengths and turns. With the same number of turns and length, it can be avoided that the difference in the number of turns of the first secondary coil 22 and the second secondary coil 23, or the difference in the length of the second wire 220 and the third wire 230 affects the similarity of the first secondary coil 22 and the second secondary coil 23, so that the resistances of the first secondary coil 22 and the second secondary coil 23 are completely consistent, and the capacitance difference is small (only related to the position difference between the turns).
preferably, the lengths of the first winding section 211 and the second winding section 212 are equal to the number of winding turns on the magnetic core 10. Therefore, the difference between the first winding section 211 and the second winding section 212 on the primary coil 21 can be reduced, the difference caused by the capacitance between the primary coil 21 and the capacitance between the first secondary coil 22 and the capacitance between the secondary coil 23 and the primary coil 21 can be reduced, meanwhile, the first secondary coil 22 and the second secondary coil 23 can be concentrated on the primary coil 21, the symmetry is good, and the stray capacitance and the insertion loss of the radio frequency transformer are reduced.
Preferably, the magnetic core 10 is a manganese-zinc-ferrite. The manganese-zinc ferrite is adopted to enable the magnetic core 10 to have higher Curie temperature, so that the interference of an external magnetic field can be effectively avoided, and the reliability of the radio frequency transformer is guaranteed.
Further, referring to fig. 8 and fig. 9 together, as a specific implementation manner of the radio frequency transformer according to the embodiment of the present invention, the radio frequency transformer further includes a casing 31 supporting the magnetic core 10, the casing 31 is provided with a plurality of terminal electrodes 32, and the plurality of terminal electrodes 32 are respectively connected to two ends of the primary coil 21, two ends of the first secondary coil 22, and two ends of the second secondary coil 23, so as to implement communication between each coil and an external circuit.
Furthermore, the shell 31 covers the magnetic core 10, the primary coil 21, the first secondary coil 22 and the second secondary coil 23, so that the shell 31 can protect the primary coil 21, the first secondary coil 22 and the second secondary coil 23, and prevent the coils from being damaged in the installation process of the radio frequency transformer and affecting the service life of the radio frequency transformer.
Further, referring to fig. 4, fig. 6 and fig. 9 together, as a specific implementation of the rf transformer according to the embodiment of the present invention, one end of the first secondary winding 22 near the connection position of the first winding section 211 and the second winding section 212 is extended outward to form a first lead 2211, and the other end of the first secondary winding 22 is extended outward to form a second lead 2212; one end of the second secondary winding 23 near the position where the first winding section 211 is connected to the second winding section 212 is extended outward to form a third lead 2311, and the other end of the second secondary winding 23 is extended outward to form a fourth lead 2312. Four lead wires which are formed by extending outwards are adopted, so that the arrangement of the first secondary coil 22 and the second secondary coil 23 is facilitated, the positions of the two secondary coils are kept corresponding, and the tightness of each turn is equivalent, so that the influence on the phase balance degree or the amplitude balance degree due to the shape and position difference of each turn is reduced.
Further, the second wiring 2212 and the fourth wiring 2312 are connected to the same terminal electrode 32; alternatively, the first wiring 2211 and the third wiring 2311 are connected to the same terminal electrode 32. That is, the first secondary coil 22 and the second secondary coil 23 are connected at both ends wound on the inner side or connected at both ends wound on the outer side, so that the negative electrodes in the circuit can be connected by the terminal electrode 32 connected thereto to form one common negative electrode.
further, the terminal electrode 32 is plated with gold on the outer layer. The end electrode 32 is gold-plated, so that the transmission loss of the product in a high-frequency band can be reduced.
Specifically, the terminal electrode 32 is embedded in the housing 31, and the embedded fixed terminal electrode 32 is adopted, so that the terminal electrode 32 is welded and fixed to an external circuit (such as a circuit board), and the modular installation of the radio frequency transformer is facilitated.
Preferably, the shell 31 is made of bakelite, which can improve the safety and stability of the product due to better high temperature resistance, insulation performance and flame retardance.
furthermore, the casing 31, the coil and the magnetic core 10 are fixed by adhesive, and the anti-vibration and anti-impact performance of the radio frequency transformer can be improved by adopting the adhesive for fixation, so that the radio frequency transformer is prevented from losing efficacy. Preferably, the adhesive glue is an epoxy glue. The epoxy resin adhesive has good insulating, flame-retardant, moisture-proof and waterproof effects, and can improve the safety performance and stability of the radio frequency transformer.
Referring to fig. 10 and fig. 11 together, the test chart results of the rf transformer according to the embodiment of the present invention are described below, wherein Trc1-Sds21 represents a curve relationship between insertion loss and frequency, Trc3-Imb21 represents a curve relationship between amplitude balance and frequency, Trc3-Imb21Phase represents a curve relationship between Phase balance and frequency, and Trc4-Sss11 represents a curve relationship between return loss and frequency. Obviously, when the test pattern (fig. 10) of the rf transformer provided by the embodiment of the present invention is compared with the test pattern (fig. 11) of the existing rf transformer product, it can be found that the insertion loss values of the two are not very different when the frequency is within 400kHz to 1.0MHz, but when the frequency is within 400MHz to 800MHz, the insertion loss of the existing rf transformer product is rapidly increased and greatly exceeds the insertion loss of the rf transformer provided by the embodiment of the present invention, and thus, the insertion loss of the rf transformer provided by the embodiment of the present invention is small and stable at high frequency. Similarly, at high frequency, the amplitude balance value and the phase balance value in the existing radio frequency transformer product can be obviously increased and exceed the test result of the radio frequency transformer provided by the embodiment of the invention, the increase amplitude of the amplitude is obviously larger than that of the test result of the radio frequency transformer provided by the invention, and the phase balance degree and the amplitude balance degree of the radio frequency transformer provided by the embodiment of the invention at high frequency band are more stable. When the frequency is within 400MHz-800MHz, the test result of the return loss of the radio frequency transformer provided by the embodiment of the invention is obviously larger than that of the radio frequency transformer in the existing product, and the product has more excellent performance at high frequency. The existing radio frequency transformer has the advantages that the transmission loss and the signal intensity distribution unevenness are more prominent when the frequency is higher, and the radio frequency transformer mainly reduces the influence on the radio frequency transformer when the frequency is increased under the high-frequency condition, such as skin effect and the like, so that the performance of the radio frequency transformer is stable when the frequency is increased.
The invention also provides an electric appliance comprising the radio frequency transformer. By adopting the radio frequency transformer, the resistance and capacitance difference between the first secondary coil and the second secondary coil can be reduced, so that the signal distribution is more balanced, the amplitude balance degree and the phase balance degree of a product are optimized, and the stray voltage and the insertion loss are reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A radio frequency transformer, characterized by: the transformer comprises a magnetic core, a primary coil, a first secondary coil and a second secondary coil, wherein the primary coil is formed by winding a first conducting wire, the first secondary coil is formed by winding a second conducting wire, and the second secondary coil is formed by winding a third conducting wire; the first conducting wire comprises a first winding section and a second winding section connected with the first winding section, the first winding section and the second winding section are wound on the magnetic core in a staggered mode along opposite directions, the second conducting wire is wound on the magnetic core along the winding direction of the first winding section, and the third conducting wire is wound on the magnetic core along the winding direction of the second winding section.
2. The radio frequency transformer of claim 1, wherein: the first winding section and the second conducting wire form a twisted pair structure, and the second winding section and the third conducting wire form a twisted pair structure.
3. The radio frequency transformer of claim 1, wherein: the magnetic core is provided with two winding holes for the first winding section and the second winding section to alternately pass through, and the connecting position of the first winding section and the second winding section is positioned on a symmetrical plane between the two winding holes.
4. The radio frequency transformer of claim 1, wherein: and an insulating coating is arranged outside the magnetic core, and a chamfer is arranged at the edge of the magnetic core.
5. The radio frequency transformer of claim 1, wherein: the magnetic core is manganese zinc ferrite.
6. The radio frequency transformer according to any one of claims 1 to 5, wherein: the radio frequency transformer further comprises a shell for supporting the magnetic core, and a plurality of end electrodes which are respectively connected with the two ends of the primary coil, the two ends of the first secondary coil and the two ends of the second secondary coil are arranged on the shell.
7. The radio frequency transformer of claim 6, wherein: one end of the first secondary coil, which is close to the position where the first winding section is connected with the second winding section, extends outwards to form a first lead wire, and the other end of the first secondary coil extends outwards to form a second lead wire; one end of the second secondary coil, which is close to the connecting position of the first winding section and the second winding section, extends outwards to form a third lead wire, and the other end of the second secondary coil extends outwards to form a fourth lead wire; the second lead and the fourth lead are connected to the same terminal electrode.
8. The radio frequency transformer of claim 6, wherein: one end of the first secondary coil, which is close to the position where the first winding section is connected with the second winding section, extends outwards to form a first lead wire, and the other end of the first secondary coil extends outwards to form a second lead wire; one end of the second secondary coil, which is close to the connecting position of the first winding section and the second winding section, extends outwards to form a third lead wire, and the other end of the second secondary coil extends outwards to form a fourth lead wire; the first lead and the third lead are connected to the same terminal electrode.
9. The radio frequency transformer of claim 6, wherein: the outer layer of the terminal electrode is plated with gold.
10. An electrical appliance, characterized by: comprising a radio frequency transformer according to any of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910868975.9A CN110581008A (en) | 2019-09-16 | 2019-09-16 | Radio frequency transformer and electric appliance |
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| CN201910868975.9A CN110581008A (en) | 2019-09-16 | 2019-09-16 | Radio frequency transformer and electric appliance |
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