CN105513776A - Transmission-line transformer voltage gain system - Google Patents
Transmission-line transformer voltage gain system Download PDFInfo
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- CN105513776A CN105513776A CN201410494376.2A CN201410494376A CN105513776A CN 105513776 A CN105513776 A CN 105513776A CN 201410494376 A CN201410494376 A CN 201410494376A CN 105513776 A CN105513776 A CN 105513776A
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Abstract
The invention discloses a transmission-line transformer voltage gain system. More than two stages of transmission lines are winded on a same magnetic core, wherein the transmission lines are ground wires of the system. The winding method of each transmission line is in the same with the magnetic field direction of each transmission line. The transmission lines are ground wires, generated magnetic fields enhance each other, and generated magnetic flux in the same direction is added together. The transmission lines are coaxial lines or parallel double-conductors. The two-stage or multistage transmission lines are winded on the same magnetic core, magnetic fields generated by secondary lines of each transmission system are overlaid with each other, and the system solves defects in the prior art that line bodies have no coupling and operate independently, so as to play a role of increasing impedance of each secondary line, and a function of inputting signals to a transmission system is not changed.
Description
Technical field
The invention belongs to microwave, technical field of pulse power, relate more specifically to a kind of line transformer voltage gain system.
Background technology
Line transformer (TLT) is mainly used in the impedance matching and the pulse boosting that realize microwave circuit.Relative to traditional transformer, owing to affecting little by the factor such as leakage inductance, stray capacitance, there is good wideband response characteristic, can impulse waveform be kept, it constructs, and also coincidence pulse power is all solid state, the developing direction of densification, is therefore subject to increasing attention in pulse power research field.Recent domestic emerges a collection of Pulse Power Techniques based on TLT success implementation, but it is less than normal and cause transformer voltage gain to be difficult to reach the problem of theoretical value to there is secondary wire impedance all the time, under pulse duration is submicrosecond and narrower situation, problem is particularly outstanding.
The groundwork mechanism of line transformer: the structural representation of what Fig. 1 provided is secondary TLT, wherein two transmission line linel and line2 are in parallel at input, in output series connection,
for the internal resistance of clock, under match condition,
, load is
, be input as
pulse time, after the electrical length of a transmission line, load obtains an amplitude is
potential pulse.The sending-end impedance of secondary TLT is
, output impedance is
, therefore the impedance no-load voltage ratio between output and input is 4, pulse voltage amplitude no-load voltage ratio is 2.
Further analysis chart 1, there are some short circuit paths in known circuit structure inside, sees two paths that in Fig. 1, dotted line identifies.When voltage wave is after a transmission line electrical length, arrive the output of transmission line, have a reflected wave along the transmission of dotted arrow direction along short circuit paths, be finally superimposed to output pulse, cause flatness of wave to decline.These short circuit paths constitute the secondary transmission line affecting burst transmissions.Obviously, secondary wire is formed between transmission line conductors and ground.Usually, only need to consider that Article 1 secondary wire is on the impact of result, the transmission of the ripple in Article 2 secondary wire can be showed by the linear superposition of Article 1 secondary wire and two main transmission lines.The process that Article 1 secondary wire (do not distinguish first, second below, mentioned secondary wire all refers to Article 1 secondary wire) affects Output rusults will be analyzed below.
If transformer works in air, in usual main transmission line, the relative dielectric constant of medium is greater than 1, therefore secondary wire impedance is generally than main transmission line impedance
greatly, the electrical length of secondary wire
be generally less than main transmission line electrical length.When the pulse inputing to transformer arrives output first, an amplitude can be transmitted along secondary wire to input close to the pulse of V.Secondary wire is in input end short circuit, and the reflection coefficient of voltage is-1, and pulse is inverted and again transmits to output.When it arrives output, the electromotive force of line 2 outer conductor and line l inner wire can be made to decline, and the amplitude of decline is determined jointly by load impedance, main transmission line impedance and secondary wire impedance magnitude.Because usual load impedance is less than secondary wire impedance, cause output reflection coefficient to be negative value, the positive pulse that result makes an amplitude be less than V is transmitted along secondary wire to TLT input again.Such process moves in circles, and the potential value of line 1 inner wire is stepped progressively declines, and in load, finally obtain a stepped pulse, the time width of each ladder is secondary wire electrical length
twice.If the transmission time of secondary wire round trip (twice of electrical length) is longer than input pulsewidth, namely
, then secondary wire existence to the main pulse flat-top that load is formed be do not have influential; Or the impedance of secondary wire is accomplished to be far longer than main transmission line impedance, namely
, then the pulse amplitude being incident to secondary wire can be ignored.
In order to improve the no-load voltage ratio of TLT, need the progression increasing TLT.Due to the existence of secondary wire, will cause the loss of gain (no-load voltage ratio), the decline of energy transmission efficiency, and this loss increases with progression and aggravates with decline, this is mainly because along with TLT progression
increase, the impedance of transformer output also with
speed increment, even and if relatively little
value also can make
reach a very large value very soon, exceed even secondary wire resistance value.When output impedance is close to during with secondary wire impedance, the reflection coefficient of output will become very large, and this will cause the quick decline of voltage gain.
From analysis above, the existence of secondary wire, has a strong impact on the transformation performance of TLT.Be summed up, this impact is mainly manifested in two aspects: one is that the existence of secondary wire can reduce the amplitude exporting pulse, causes the loss of pulse amplitude; Two is that the existence of secondary wire can the flat-top width of Limited Pulses, causes pulse step shape flat-top.
Oxford University Paul.W.Smith have developed multiple stage line transformer in nearly 20 years, its performance is in genus leading position, high-frequency impulse field, extensively concerned have below two: one be ten grades of coaxial transmission line TLT (GraneanP.N., RossiJ.O., BrownP. of report in 1996, andSmithP, W., Ahighvoltagetransmissionlinetransformerwithverylowdroop, Rev.Sci.Instrum., 1996,67 (7): 2630-2635); Another is ten grades of two-wire TLT (JainK.K.andSmithP.W. of report in 2006, Fast-RiseTimepulsetransformersbuiltfromrotatedstacked1:1 transformers, IEEETransactionsonPlasmaScience, 2006,34 (5): 1853-1857).
Domesticly developed one ten grades TLT device (JianQiu; KefuLiu; YifanWu; APulsedpowersupplybasedonpowersemiconductorswitchesandtr ansmissionlinetransformer; IEEETransactionsonDielectricsandElectricalInsulationVol. 14, N0.4; August2007), for boosting to high repetitive frequency pulsed in all solid state repetitive frequency pulsed source, the input/output pulse voltage that result shows this TLT is respectively 1.7kV and 10kV, repetition rate 10kHz, without obvious distortion, but there is larger follow-up concussion in front stage waveform.
In above technology, the transmission line system on each rank of TLT except input, export termination have interconnected except, line body itself is considered as without coupling, independent operating, has the independent magnetic core used separately.Under equal coil turn, secondary wire impedance is less than normal.
Summary of the invention
1, object of the present invention.
The present invention is in order to solve the existence of secondary wire in prior art, and pressure ratio is difficult to reach theoretical value, and a kind of line transformer voltage gain system proposed, under the prerequisite keeping each parameter of pulse forward transmission line substantially constant, improve the impedance of secondary wire.
2, the technical solution adopted in the present invention.
Line transformer voltage gain system, transmission line on same magnetic core more than coiling two-stage, wherein transmission line is the ground wire of system, the canoe of each transmission line is that the magnetic direction of each transmission line is identical, transmission line and ground wire produce magnetic field to be strengthened mutually, the magnetic flux produced is added in the same way, and impedance increases.Described transmission line can adopt coaxial line or parallel double conducting wire.
3, beneficial effect of the present invention.
(1) two-stage or more level transmission line is wound on same magnetic core by the present invention jointly, the magnetic field allowing the secondary wire of each transmission system produce superposes mutually, solve prior art center line body line body itself without coupling, the shortcoming of independent operating, thus play the effect increasing respective secondary wire impedance, do not change the performance of signal input transmission line system simultaneously.
(2) the present invention is maintaining under the constant prerequisite of each transmission system line length and coil turn, make use of the theoretical secondary wire impedance increasing TLT of common mode cleverly, thus allows the voltage gain of TLT more level off to theoretical value.Meanwhile, above-mentioned change result also in the magnetic core number needed for traditional TLT of the more identical exponent number of magnetic core quantity that the present invention adopts and will lack.
Accompanying drawing explanation
Fig. 1 is two-stage TLT structure chart.
Fig. 2 is level Four TLT structural representation.
Fig. 3 is coupled transfer wire system.
Embodiment
In order to enable the auditor of Patent Office especially the public clearly understand technical spirit of the present invention and beneficial effect, applicant will elaborate below by way of example, but be not all the restriction to the present invention program to the description of embodiment, any conceive according to the present invention done be only pro forma but not substantial equivalent transformation and all should be considered as technical scheme category of the present invention.
Embodiment
In prior art, often make high-order TLT in the following ways, to reach suitable voltage gain value, thus the ratio of secondary wire impedance and line characteristic impedance (
) increase.
For the transmission line determined, its characteristic impedance is certain, increases its ratio, needs to increase secondary wire resistance value, and secondary wire impedance is determined by the inductance size of institute's coiling.Inductance is finally determined by number of wire turns, magnetic core correlation properties.
According to inductance computing formula (
), for the magnetic core of selected size, increase magnetic permeability or increase the number of turn inductance value can be made to increase.
Increase the number of turn simply and just mean increase line length, and increase line length just make transmission line at different levels over the ground distributed capacitance increase, distributed capacitance increases and just causes leakage current to increase over the ground, thus causes total current to increase, makes to input total power consumption increase.
In addition, the magnetic permeability of magnetic core can be increased, but in short pulse situation, (nanosecond) can adopt the relative permeability of magnetic core the highest also with regard to about 2000, there is restrictive condition.
Be more than conventional selection mode, but have some drawbacks, for this reason, the present invention proposes the new implementation of new TLT transmission line at different levels, namely based on the coupled transmission line system schema of public magnetic core.
On same magnetic core, coiling two is to multistage coaxial or parallel double conducting wire transmission system, as shown in Figure 3.In figure, each transmission line of winding is the ground wire of the ground wire of system, the i.e. outer conductor of coaxial line, or parallel double conducting wire.
Its operation principle: when operating current flows through two around to contrary transmission line system (transmission line 1, transmission line 2, each transmission line can be coaxial line, also can be parallel double conducting wire transmission system) secondary wire (coaxial line or parallel double conductor lines are respective ground wire) time, two magnetic field H1, H2 mutually strengthened are produced in magnetic core, now namely coil presents high impedance, produce very strong damping, reach the effect increasing secondary wire decay, namely play the effect increasing secondary wire impedance.
" the coupled transfer wire system of desirable public magnetic core " that the present invention relates to has decay inhibitory action to the pulse signal in secondary wire, and to the difference mode signal of the respective internal transmission of transmission line 1, transmission line 2 without inductance inhibitory action, namely achieve on the pulse signal of forward transmission without impact, on the parameter of the associated transport wire system object without impact.
Certainly, the non complete symmetry (referring to the asymmetry of coaxial line or parallel double conductor transmission line) of actual coil coiling can cause the generation of differential mode leakage inductance, but differential mode inductance value is little.Difference mode signal, i.e. direct impulse electric current, respectively when two transmission line system inside are flow through, internal system electric current direction in two conductors of internal system is contrary, and the magnetic flux of generation is cancelled out each other, and transmission line system paired pulses presents Low ESR.
After pulse signal arrives transmission system output at different levels, when the ground wire that pulse signal need flow through each transmission system returns to the earth point of resultant signal, two ground wires play secondary wire effect, on it, the sense of current is identical, the magnetic flux produced is added in the same way, each ground wire pulse signals presents high impedance, thus plays the effect increasing secondary wire impedance.
Claims (3)
1. a line transformer voltage gain system, it is characterized in that: the transmission line on same magnetic core more than coiling two-stage, wherein transmission line is the ground wire of system, the canoe of each transmission line is that the magnetic direction of each transmission line is identical, transmission line and ground wire produce magnetic field to be strengthened mutually, the magnetic flux produced is added in the same way, and impedance increases.
2. line transformer voltage gain system according to claim 1, is characterized in that: described transmission line is coaxial line.
3. line transformer voltage gain system according to claim 1, is characterized in that: described transmission line is parallel double conducting wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410494376.2A CN105513776A (en) | 2014-09-25 | 2014-09-25 | Transmission-line transformer voltage gain system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410494376.2A CN105513776A (en) | 2014-09-25 | 2014-09-25 | Transmission-line transformer voltage gain system |
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| CN105513776A true CN105513776A (en) | 2016-04-20 |
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| CN201410494376.2A Pending CN105513776A (en) | 2014-09-25 | 2014-09-25 | Transmission-line transformer voltage gain system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09232147A (en) * | 1996-02-22 | 1997-09-05 | Nec Corp | Transmission line transformer |
| JPH10116732A (en) * | 1996-10-09 | 1998-05-06 | Nec Corp | Transmission line transformer and amplifier unit employing it |
| US20110279209A1 (en) * | 2010-05-14 | 2011-11-17 | Schoessow Michael J | High-impedance dc-isolating transmission line transformers |
| CN102158117B (en) * | 2011-03-24 | 2013-04-17 | 浙江大学 | Pulse power system based on coupling of transmission line transformer (TLT) and multi-switch drive variable resistance lines |
-
2014
- 2014-09-25 CN CN201410494376.2A patent/CN105513776A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09232147A (en) * | 1996-02-22 | 1997-09-05 | Nec Corp | Transmission line transformer |
| JPH10116732A (en) * | 1996-10-09 | 1998-05-06 | Nec Corp | Transmission line transformer and amplifier unit employing it |
| US20110279209A1 (en) * | 2010-05-14 | 2011-11-17 | Schoessow Michael J | High-impedance dc-isolating transmission line transformers |
| CN102158117B (en) * | 2011-03-24 | 2013-04-17 | 浙江大学 | Pulse power system based on coupling of transmission line transformer (TLT) and multi-switch drive variable resistance lines |
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