CN105206395A - Radio-frequency transformer - Google Patents
Radio-frequency transformer Download PDFInfo
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- CN105206395A CN105206395A CN201510657089.3A CN201510657089A CN105206395A CN 105206395 A CN105206395 A CN 105206395A CN 201510657089 A CN201510657089 A CN 201510657089A CN 105206395 A CN105206395 A CN 105206395A
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- coil
- radio freqnency
- freqnency transformer
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Abstract
The invention relates to a radio-frequency transformer. The radio-frequency transformer comprises a shell, a coil and a magnetic core. The coil is wound on the magnetic core which is fixed inside the shell; the coil adopts two-wire winding and comprises a primary coil body and a secondary coil body, the first circle of the primary coil body is wound through a first wire, the second circle of the primary coil body and the first circle of the secondary coil body are wound through the first wire and the second wire together. According to the radio-frequency transformer, the low insertion loss is achieved.
Description
Technical field
The present invention relates to a kind of electronic devices and components, particularly relate to a kind of radio freqnency transformer.
Background technology
Radio freqnency transformer to be widely used in various small-power electronic circuit, to realize the functions such as impedance matching, DC-isolation, common-mode suppression, generally comprising two groups of magnetic-coupled coils.
Domestic and international radio freqnency transformer can divide a variety of according to specification and coil winding mode, but stray capacitance is large between the coil of traditional radio freqnency transformer, cause insertion loss also very large, the requirement in military electronic element cannot be reached, thus limit its scope of application.
Summary of the invention
Based on this, be necessary the radio freqnency transformer that a kind of low insertion loss is provided.
A kind of radio freqnency transformer, comprise shell, coil, magnetic core, described coil winding is on described magnetic core, and described magnetic core is fixed on described enclosure; Described coil is two-wire coiling, described coil comprises primary coil and primary coil, the first lap of wherein said primary coil is by first wire-wound system, and the second circle of described primary winding and the first lap of described secondary coil start by single line and second common coiling of line.
Wherein in an embodiment, 2nd ~ 7 circles of described primary coil and 1 ~ 6 circle of described secondary coil for Double-wire parallel wound, 8th ~ 12 circles of described primary coil and 7 ~ 11 of described secondary coil enclose be single line and around.
Wherein in an embodiment, the end of described single line directly draws the shaping centre cap as described secondary coil.
Wherein in an embodiment, described centre tapped length is 30 ~ 50 millimeters.
Wherein in an embodiment, the number of turns of described primary coil is 12 circles, and the number of turns of described secondary coil is 14 circles.
Wherein in an embodiment, described magnetic core and shell are bonded into one by adhesive glue.
Wherein in an embodiment, described adhesive glue is epoxy resin.
Wherein in an embodiment, described magnetic core is two-hole magnet, and described coil carries out coiling through diplopore.
Wherein in an embodiment, the pin number that described primary coil is drawn is 2, and the pin number that described secondary coil is drawn is 3.
Above-mentioned radio freqnency transformer adopts the mode coiling of two-wire coiling, and the first lap of primary coil is by first wire-wound system, second circle of described primary winding and the first lap of described secondary coil start by single line and second common coiling of line, the stray capacitance between primary coil and secondary coil can be reduced like this, thus reach the object reducing radio freqnency transformer insertion loss.
Accompanying drawing explanation
Fig. 1 is the contour structures top view of an embodiment radio freqnency transformer;
The contour structures end view that Fig. 2 is radio freqnency transformer shown in Fig. 1;
The contour structures upward view that Fig. 3 is radio freqnency transformer shown in Fig. 1;
Fig. 4 is the cut-away view of radio freqnency transformer shown in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Please refer to Fig. 1 to Fig. 3, be respectively the vertical view of the contour structures of the radio freqnency transformer of one embodiment of the invention, end view and upward view.
The radio freqnency transformer of the present embodiment comprises shell 110, magnetic core 120, coil 130, adhesive glue 140.Wherein, coil 130 is wrapped on magnetic core 120, and it is inner that magnetic core 120 is fixed on shell 110.
Shell 110 adopts ceramic material, little to ensure its temperature variant coefficient.In addition, the most high-temperature resistant of shell 110 reaches 180 degrees Celsius, meets the requirement of military electronic element.
Magnetic core 120 is two-hole magnet.In the present embodiment, magnetic core 120 adopts ferrite high temperature sintering technique to burn till, and adds metal material when shaping, makes it to have high stability and low-loss advantage, and can be high temperature resistant.In addition, the magnetic permeability of magnetic core 120 is 4000 ~ 5000.
Coil 130 carries out coiling through the diplopore of magnetic core 120, and the end of coil 130 directly draws the shaping pin as described radio freqnency transformer.
In one embodiment, coil 130 adopts the mode of two-wire coiling to carry out coiling.Coil 130 comprises primary coil and secondary coil, and the first lap of wherein said primary coil is by first wire-wound system, and the second circle of described primary winding and the first lap of described secondary coil start by single line and second common coiling of line.
In the present embodiment, the number of turns of described primary coil is 12 circles, and the number of turns of described secondary coil is 14 circles.Particularly, when carrying out coil winding, first first wire-wound system one is enclosed the first lap as primary coil, and then with second line Double-wire parallel wound together, complete 2nd ~ 7 circles of primary winding and 1 ~ 6 circle of described secondary coil, and single line is reserved 30 ~ 50 millimeters of central shaft heads as secondary coil.Then utilize second line to carry out single line and enclose around with 7 ~ 11 of complete primary coil 8th ~ 12 circles and described secondary coil, finally complete 3 circles that secondary coil is remaining, until whole product completes coiling, stray capacitance between this kind of winding method reduction coil, thus reduce the insertion loss value of product.
The pin number that described primary coil is drawn is 2, and the pin number that described secondary coil is drawn is 3.Be appreciated that the progression of coil can also be multistage, be not construed as limiting here.
In addition, the mid portion of coil 120 adopts the mode of Double-wire parallel wound to be wound on described magnetic core, can reduce the leakage field phenomenon of transformer like this.Coil 120 all have passed through dipping lacquer process, through hot setting formed protective layer, thus well ensure product not damp, be stale-proof.In the present embodiment, coil 120 is high temperature enamel covered wire, high temperature resistantly reaches 180 DEG C, through design, produces and after test, meets the military temperature requirement of radio freqnency transformer.
Adhesive glue 140 is for being bonded into one magnetic core and shell by adhesive glue.
In the present embodiment, adhesive glue 140 material is epoxy resin, is appreciated that can also be other thermosetting resins in other embodiments.
Incorporated by reference to Fig. 3, it is the cut-away view of network transformer shown in Fig. 1.
The pin number that primary coil 132 and secondary coil 134 are drawn is respectively 2 and 3.The pin-pitch that wherein primary coil 132 is drawn is 2.54 millimeters, and the pin-pitch that secondary coil 134 is drawn is 1.27 millimeters.The package width of each pin is 0.71 millimeter.
Above-mentioned radio freqnency transformer adopts the mode coiling of two-wire coiling, and the first lap of primary coil is by first wire-wound system, second circle of described primary winding and the first lap of described secondary coil start by single line and second common coiling of line, the stray capacitance between primary coil and secondary coil can be reduced like this, thus reach the object reducing radio freqnency transformer insertion loss.
The present invention carries out Design and optimization and adjustment from coil winding aspect, realizes the application requirement of product low insertion loss.Test of the present invention is 0.3MHz ~ 800MHz frequently, and insertion loss value when adopting traditional winding method is 8.5dB, and adopts the insertion loss value after the mode of Double-wire parallel wound to be 2.25dB, reaches the requirement of the insertion loss improving radio freqnency transformer.
Present invention achieves that radio freqnency transformer operating frequency is high, requirement that frequency of utilization wide ranges, loss are low, enhance the reliability of product simultaneously, the working temperature of above-mentioned radio freqnency transformer the scope of-55 DEG C ~ 130 DEG C, can reach military requirements, meets the test requirements document of GJB360B.The present invention is easy to operate, is easy to realize batch production.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a radio freqnency transformer, is characterized in that, comprises shell, coil, magnetic core, and described coil winding is on described magnetic core, and described magnetic core is fixed on described enclosure; Described coil is two-wire coiling, described coil comprises primary coil and primary coil, the first lap of wherein said primary coil is by first wire-wound system, and the second circle of described primary winding and the first lap of described secondary coil start by single line and second common coiling of line.
2. radio freqnency transformer according to claim 1, is characterized in that, 2nd ~ 7 circles of described primary coil and 1 ~ 6 circle of described secondary coil for Double-wire parallel wound, 8th ~ 12 circles of described primary coil and 7 ~ 11 of described secondary coil enclose be single line and around.
3. radio freqnency transformer according to claim 2, is characterized in that, the end of described single line directly draws the shaping centre cap as described secondary coil.
4. radio freqnency transformer according to claim 3, is characterized in that, described centre tapped length is 30 ~ 50 millimeters.
5. radio freqnency transformer according to claim 2, is characterized in that, the number of turns of described primary coil is 12 circles, and the number of turns of described secondary coil is 14 circles.
6. radio freqnency transformer according to claim 1, is characterized in that, described magnetic core and shell are bonded into one by adhesive glue.
7. Wound-rotor type radio freqnency transformer according to claim 4, is characterized in that, described adhesive glue is epoxy resin.
8. radio freqnency transformer according to claim 1, is characterized in that, described magnetic core is two-hole magnet, and described coil carries out coiling through diplopore.
9. radio freqnency transformer according to claim 1, is characterized in that, the pin number that described primary coil is drawn is 2, and the pin number that described secondary coil is drawn is 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510657089.3A CN105206395A (en) | 2015-10-12 | 2015-10-12 | Radio-frequency transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510657089.3A CN105206395A (en) | 2015-10-12 | 2015-10-12 | Radio-frequency transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105206395A true CN105206395A (en) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510657089.3A Pending CN105206395A (en) | 2015-10-12 | 2015-10-12 | Radio-frequency transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105742011A (en) * | 2016-04-01 | 2016-07-06 | 深圳振华富电子有限公司 | Radio frequency transformer and fabrication method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01304711A (en) * | 1988-06-01 | 1989-12-08 | Murata Mfg Co Ltd | Transformer |
| CN101258567A (en) * | 2005-09-08 | 2008-09-03 | 胜美达集团株式会社 | Coil device, composite coil device and transformer device |
| DE102013009588A1 (en) * | 2012-06-14 | 2013-12-19 | Robert Bosch Gmbh | Welding transformer for use in direct current-resistance point weld system, has iron core provided with iron core segments, primary winding provided with primary winding coils, and secondary windings provided with secondary winding coils |
| CN104078208A (en) * | 2014-06-30 | 2014-10-01 | 深圳振华富电子有限公司 | Radio-frequency transformer |
| CN203950661U (en) * | 2014-06-11 | 2014-11-19 | 西北台庆科技股份有限公司 | Vertical transformer |
| US20150028981A1 (en) * | 2012-09-21 | 2015-01-29 | Ppc Broadband, Inc. | Radio frequency transformer winding coil structure |
| CN104849678A (en) * | 2015-05-22 | 2015-08-19 | 大连理工大学 | Probe for intensity measurement of alternating magnetic field in low-pressure very-high-frequency discharge |
| CN205211550U (en) * | 2015-10-12 | 2016-05-04 | 深圳振华富电子有限公司 | Radio -frequency transformer |
-
2015
- 2015-10-12 CN CN201510657089.3A patent/CN105206395A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01304711A (en) * | 1988-06-01 | 1989-12-08 | Murata Mfg Co Ltd | Transformer |
| CN101258567A (en) * | 2005-09-08 | 2008-09-03 | 胜美达集团株式会社 | Coil device, composite coil device and transformer device |
| DE102013009588A1 (en) * | 2012-06-14 | 2013-12-19 | Robert Bosch Gmbh | Welding transformer for use in direct current-resistance point weld system, has iron core provided with iron core segments, primary winding provided with primary winding coils, and secondary windings provided with secondary winding coils |
| US20150028981A1 (en) * | 2012-09-21 | 2015-01-29 | Ppc Broadband, Inc. | Radio frequency transformer winding coil structure |
| CN203950661U (en) * | 2014-06-11 | 2014-11-19 | 西北台庆科技股份有限公司 | Vertical transformer |
| CN104078208A (en) * | 2014-06-30 | 2014-10-01 | 深圳振华富电子有限公司 | Radio-frequency transformer |
| CN104849678A (en) * | 2015-05-22 | 2015-08-19 | 大连理工大学 | Probe for intensity measurement of alternating magnetic field in low-pressure very-high-frequency discharge |
| CN205211550U (en) * | 2015-10-12 | 2016-05-04 | 深圳振华富电子有限公司 | Radio -frequency transformer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105742011A (en) * | 2016-04-01 | 2016-07-06 | 深圳振华富电子有限公司 | Radio frequency transformer and fabrication method thereof |
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Application publication date: 20151230 |
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