CN101404456B - Transformer - Google Patents
Transformer Download PDFInfo
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- CN101404456B CN101404456B CN2008101341667A CN200810134166A CN101404456B CN 101404456 B CN101404456 B CN 101404456B CN 2008101341667 A CN2008101341667 A CN 2008101341667A CN 200810134166 A CN200810134166 A CN 200810134166A CN 101404456 B CN101404456 B CN 101404456B
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- inductance
- transformer
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- electric capacity
- electricity
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Abstract
The invention relates to a transformer which comprises four capacitors and four inductors. The first capacitor is electrically connected in series between a first endpoint and the ground. The first inductor is electrically connected with the first endpoint in series. The second capacitor is electrically connected in series between the first inductor and the ground. The second inductor is electrically connected in series between the first inductor and the second capacitor. The third inductor is electrically connected in series between a second endpoint and the ground. The third inductor is electrically connected in series with the second endpoint. The fourth capacitor is electrically connected in series between a third endpoint and the ground. The second inductor is electrically connected in series between the third inductor and the third endpoint.
Description
Technical field
The present invention relates to a kind of transformer.
Background technology
In balance-non-equilibrium band pass filter, can produce mutual inductance by mutual coupled magnetic field between two inductance that constitute transformer, to be responsible for single-ended transmission differential signal.Under the trend of miniaturization of electronic products, electronic building brick has been integrated in the circuit base plate, for example passive components such as electric capacity, inductance and resistance.Two of transformer can be made of the configuration of circuit base plate the inductance that coil constituted.
Fig. 1 illustrates known a kind of transformer.Please refer to Fig. 1, known typical transformer comprises one first inductance L 1 and one second inductance L 2.By the mutual electromagnetic induction between first inductance L 1 and second inductance L 2, the input voltage at first inductance L, 1 two ends can be converted to the output voltage at second inductance L, 2 two ends.In theory, the ratio of input voltage and output voltage equals the ratio of first inductance L 1 and second inductance L 2.
Fig. 2 illustrates known another kind of transformer.Please refer to Fig. 2, be different from the typical transformer of Fig. 1, it is right that the transformer of Fig. 2 can convert single signal to a differential signal.The transformer of Fig. 2 comprises one first capacitor C 11, one first inductance L 11, one second capacitor C 12, one second inductance L 12, one the 3rd capacitor C 13 and one the 3rd inductance L 13.Reciprocation between first inductance L 11 and second inductance L 12 produces the first mutual inductance L m11, and the reciprocation between first inductance L 11 and the 3rd inductance L 13 produces the second mutual inductance L m12.By the first mutual inductance L m11 and the second mutual inductance L m12, it is right to convert differential signal to the responsible signal that will import the first end points P11, exports via the second end points P12 and the 3rd end points P13 again.
Summary of the invention
Purpose of the present invention proposes a kind of transformer, designs with simplified topology.
Purpose of the present invention proposes a kind of transformer, is applicable to band pass filter, increases the forbidden decay speed of band pass filter to produce transmission zero.
For achieving the above object, technical solution of the present invention is:
A kind of transformer comprises four electric capacity, four inductance and one first additional capacitor.The first electric capacity electricity is connected in series with between one first end points and the ground connection.The first inductance electricity is connected in series with first end points.The second electric capacity electricity is connected in series with between first inductance and the ground connection.The second inductance electricity is connected in series with between first inductance and second electric capacity.The 3rd electric capacity electricity is connected in series with between one second end points and the ground connection.The 3rd inductance electricity is connected in series with first end points.The 4th electric capacity electricity is connected in series with between one the 3rd end points and the ground connection.The 4th inductance electricity is connected in series with between the 3rd inductance and the 3rd end points.First additional capacitor meets and preestablishes capacitance.First inductance and the 3rd inductance reciprocation between the two produces one and meets the first mutual inductance that preestablishes inductance value, and it is mutual electric and connect with first additional capacitor.
In one embodiment of this invention, first additional capacitor is a parasitic capacitance, its by first inductance and the 3rd inductance between the two reciprocation produced.
In one embodiment of this invention, transformer also comprises one second additional capacitor, wherein second inductance and the 4th inductance between the two reciprocation produce one and meet the second mutual inductance that preestablishes inductance value, it is mutual electric and connect with second additional capacitor.
In one embodiment of this invention, the inductance value of first inductance, second inductance, the 3rd inductance and the 4th inductance is identical in fact.
In one embodiment of this invention, second additional capacitor is a parasitic capacitance, its by second inductance and the 4th inductance between the two reciprocation produced.
In one embodiment of this invention, first inductance and the 3rd inductance are symmetrical structure, and second inductance and the 4th inductance are symmetrical structure.
In one embodiment of this invention, first electric capacity and the 3rd electric capacity are symmetrical structure, and second electric capacity and the 4th electric capacity are symmetrical structure.
In one embodiment of this invention, first inductance and second inductance are to be formed by same coil.
In one embodiment of this invention, the 3rd inductance and the 4th inductance are to be formed by same coil.
When transformer application of the present invention during, can produce transmission zero by parasitic capacitance that reciprocation produced between two inductance and mutual inductance, to increase the forbidden decay speed of band pass filter in band pass filter.In addition, the present invention changes transformer into symmetrical architecture from the asymmetric framework of tradition, and this helps to simplify the layout designs of transformer.
Description of drawings
Fig. 1 illustrates known a kind of transformer.
Fig. 2 illustrates known another kind of transformer.
Fig. 3 illustrates a kind of transformer of one embodiment of the invention.
The primary clustering symbol description
C11: first electric capacity
C12: second electric capacity
C13: the 3rd electric capacity
C21: first electric capacity
C22: second electric capacity
C23: the 3rd electric capacity
C24: the 4th electric capacity
Cp21: first parasitic capacitance
Cp22: second parasitic capacitance
L1: first inductance
L2: second inductance
L11: first inductance
L12: second inductance
L13: the 3rd inductance
L21: first inductance
L22: second inductance
L23: the 3rd inductance
L24: the 4th inductance
Lm11: the first mutual inductance
Lm12: the second mutual inductance
Lm21: the first mutual inductance
Lm22: the second mutual inductance
P11: first end points
P12: second end points
P13: the 3rd end points
P21: first end points
P22: second end points
P23: the 3rd end points
Embodiment
For the features and advantages of the present invention can be become apparent, embodiment cited below particularly, and conjunction with figs. are described in detail below.
Fig. 3 illustrates a kind of transformer of one embodiment of the invention.Please refer to Fig. 3, the transformer of present embodiment comprises four capacitor C 21-C24 and four inductance L 21-L24.First capacitor C, 21 electricity are connected in series with between one first end points P21 and the ground connection.First inductance L, 21 electricity are connected in series with the first end points P21.Second capacitor C, 22 electricity are connected in series with between first inductance L 21 and the ground connection.Second inductance L, 22 electricity are connected in series with between first inductance L 21 and second capacitor C 22.The 3rd capacitor C 23 electricity are connected in series with between one second end points P22 and the ground connection.The 3rd inductance L 23 electricity are connected in series with the second end points P22.The 4th capacitor C 24 electricity are connected in series with between one the 3rd end points P23 and the ground connection.The 4th inductance L 24 electricity are connected in series with between the 3rd inductance L 23 and the 3rd end points P23.
In addition, transformer more comprises one first additional capacitor Cp21.First inductance L 21 and the 3rd inductance L 23 reciprocation between the two will produce one first mutual inductance L m21, the mutual electricity and connecting of the first additional capacitor Cp21 and one first mutual inductance L m21 wherein, and this can produce the high-frequency transmission characteristic at zero point, and has increased the inhibition ability of disturbing for high-frequency noise.
Appearance value and the sense value of the first additional capacitor Cp21 and one first mutual inductance L m21 are all predefined default value, and the method that produces the first additional capacitor Cp21 and one first mutual inductance L m21 and control its appearance value and sense value can be sense value and the mutual alignment of adjusting first inductance L 21 and the 3rd inductance L 23.
In the present embodiment, the first additional capacitor Cp21 can be a parasitic capacitance, its by first inductance L 21 and the 3rd inductance L 23 between the two reciprocation produced.
In the present embodiment, second inductance L 22 and the 4th inductance L 24 reciprocation between the two also produce one second additional capacitor Cp22 and one second mutual inductance L m22, the mutual electricity and connecting of the second additional capacitor Cp22 and one second mutual inductance L m22 wherein, and this also produces the high-frequency transmission characteristic at zero point, and has increased the inhibition ability of disturbing for high-frequency noise.
Appearance value and the sense value of the second additional capacitor Cp22 and one second mutual inductance L m22 are all predefined default value, and the method that produces the second additional capacitor Cp22 and one second mutual inductance L m22 and control its appearance value and sense value can be sense value and the mutual alignment of adjusting second inductance L 22 and the 4th inductance L 24.
In the present embodiment, the second additional capacitor Cp22 can be a parasitic capacitance, its by second inductance L 22 and the 4th inductance L 24 between the two reciprocation produced.In the present embodiment, the inductance value of first inductance L 21, second inductance L 22, the 3rd inductance L 23 and the 4th inductance L 24 can design identical in fact.
In the present embodiment, first inductance L 21 and the 3rd inductance L 23 can be symmetrical structure, and second inductance L 22 and the 4th inductance L 24 can be symmetrical structure.In addition, first capacitor C 21 and the 3rd capacitor C 23 can be symmetrical structure, and second capacitor C 22 and the 4th capacitor C 24 also can be symmetrical structure.And first inductance L 21 and second inductance L 22 can be formed by same coil, and the 3rd inductance L 23 and the 4th inductance L 24 can be formed by same coil.First inductance L 21 and second inductance L 22, the 3rd inductance L 23 and the 4th inductance L 24 only are the convenient title of distinguishing, and first inductance L 21 and second inductance L 22 belong to two parts of an inductance respectively on the side circuit layout, and the 3rd inductance L 23 and the 4th inductance L 24 can belong to two parts of another inductance respectively.Therefore, the layout designs of transformer is simplified.
In sum, when transformer application of the present invention during, can produce transmission zero by parasitic capacitance that reciprocation produced between two inductance and mutual inductance, to increase the forbidden decay speed of band pass filter in band pass filter.In addition, the present invention changes transformer into symmetrical architecture from the asymmetric framework of tradition, and this helps to simplify the layout designs of transformer.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; any person with usual knowledge in their respective areas; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, thus protection scope of the present invention when with the protection range of claim the person of being defined be as the criterion.
Claims (9)
1. a transformer is characterized in that, comprising:
One first electric capacity, electricity are connected in series with between one first end points and the ground connection;
One first inductance, electricity are connected in series with this first end points;
One second electric capacity, electricity are connected in series with between this first inductance and the ground connection;
One second inductance, electricity are connected in series with between this first inductance and this second electric capacity;
One the 3rd electric capacity, electricity are connected in series with between one second end points and the ground connection;
One the 3rd inductance, electricity are connected in series with this second end points;
One the 4th electric capacity, electricity are connected in series with between one the 3rd end points and the ground connection;
One the 4th inductance, electricity are connected in series with between the 3rd inductance and the 3rd end points; And
One first additional capacitor meets and preestablishes capacitance,
Wherein this first inductance and the 3rd inductance reciprocation between the two produces one and meets the first mutual inductance that preestablishes inductance value, and its and this first additional capacitor is mutual electric and connect.
2. transformer as claimed in claim 1 is characterized in that, described this first additional capacitor is a parasitic capacitance, its by this first inductance and the 3rd inductance between the two reciprocation produced.
3. transformer as claimed in claim 1 is characterized in that, also comprises:
One second additional capacitor meets and preestablishes capacitance,
Wherein this second inductance and the 4th inductance between the two reciprocation produce one and meet the second mutual inductance that preestablishes inductance value, its and this second additional capacitor is mutual electric and connect.
4. transformer as claimed in claim 3 is characterized in that, described this second additional capacitor is a parasitic capacitance, its by this second inductance and the 4th inductance between the two reciprocation produced.
5. transformer as claimed in claim 3 is characterized in that, the inductance value of described this first inductance, this second inductance, the 3rd inductance and the 4th inductance is identical.
6. transformer as claimed in claim 1 is characterized in that, described this first inductance and the 3rd inductance are symmetrical structure, and this second inductance and the 4th inductance are symmetrical structure.
7. transformer as claimed in claim 1 is characterized in that, described this first electric capacity and the 3rd electric capacity are symmetrical structure, and this second electric capacity and the 4th electric capacity are symmetrical structure.
8. transformer as claimed in claim 1 is characterized in that, described this first inductance and this second inductance are to be formed by same coil.
9. transformer as claimed in claim 1 is characterized in that, described the 3rd inductance and the 4th inductance are to be formed by same coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101341667A CN101404456B (en) | 2008-07-23 | 2008-07-23 | Transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101341667A CN101404456B (en) | 2008-07-23 | 2008-07-23 | Transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101404456A CN101404456A (en) | 2009-04-08 |
| CN101404456B true CN101404456B (en) | 2010-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101341667A Active CN101404456B (en) | 2008-07-23 | 2008-07-23 | Transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101404456B (en) |
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2008
- 2008-07-23 CN CN2008101341667A patent/CN101404456B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101404456A (en) | 2009-04-08 |
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