CN100391078C - Rectification transformers with self coupling compensation and resournace shield - Google Patents
Rectification transformers with self coupling compensation and resournace shield Download PDFInfo
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- CN100391078C CN100391078C CNB2003101106772A CN200310110677A CN100391078C CN 100391078 C CN100391078 C CN 100391078C CN B2003101106772 A CNB2003101106772 A CN B2003101106772A CN 200310110677 A CN200310110677 A CN 200310110677A CN 100391078 C CN100391078 C CN 100391078C
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Abstract
The present invention relates to a rectifying transformer with self-coupling compensation and harmonic shielding. A self-coupling tap is led out from the middle of a secondary winding of a power supply transformer, the secondary winding is divided into two segments similar to a common winding and a series winding of autotransformer by the tap, and the two segments are tightly coupled. The two segments of the secondary winding and a three winding formed from a primary winding on an iron core column are concentrically arranged, wherein the common winding is arranged between the primary winding and the series winding, equivalent impedance is zero, and both ends of the common winding are connected with a filter LC branch circuit externally connected. The present invention can carry out reactive compensation to an inductive current in a user industrial frequency nearby, and a harmonic current is forced to be counteracted by the ampere-turn balancing action of the two winding segments divided by the tap in a corresponding harmonic frequency; the harmonic current is led to flow through the series winding and return to a load nearby and is prevented from being transmitted to a primary power network after passing across an air gap, harmonic is treated from a source, and the damage to the transformer caused by the harmonic current and harmonic flux is also avoided when harmonic shielding and isolation are realized for the primary power network.
Description
[technical field]
The present invention relates to electric power conveying technology field, specially refer to rectification, the change of current and traction and arc furnace transformer and compensation thereof and filter apparatus.
[background technology]
The proportion of modern power systems nonlinear-load progressively increases, outstanding is rectification load and arc furnace load, the latter comprises interchange or direct current steel-making, no matter which kind of steel-making, its electric current is as commutation supply voltage, also be the intermittence conducting and cut-off, force the current waveform of power supply network to distort, except that fundamental frequency, also have multiple higher harmonic content, harmonic current injects from the transformer outlet side, forms harmonic current source, flee to former side's grid side through the supply transformer winding, to bringing many-sided harmful effect by loop and neighbouring device.The method of traditional improvement harmonic wave is a passive filtering, and the parallel branch of CL element serial connection commonly used is made tuner, makes it the nth harmonic electric current that injects is shunted, as the equivalent impedance Z of filter branch
F=nX
L-Xc/n
2=0, promptly get X
L=Xc/n
2, then under this subfrequency, its induction reactance offsets with the capacitive reactance that is connected in series, and the zero impedance of parallel branch attracts this subharmonic current branch to pour off entirely, and filter effect is best.But for avoiding resonance overvoltage and harmonic wave to amplify the actual X that selects for use
L=K
SXc/n
2, K
SFor greater than 1 coefficient of safety, require this coefficient value should not be too little usually, so just obviously weakened filter effect.Active filter is the current converter of forming with power electric component, and the direct current that the DC source that has is provided detects and automatic control mode by following the tracks of, and inversion in real time is to be same as distorted waveform but the opposite offset current of direction.This technology early has application in industrially developed country, but its technical difficulty is big, the corollary equipment complexity, and the cost height fails to be used widely so far.
[summary of the invention]
Technical problem to be solved by this invention provides a kind of passive filter generation resonance overvoltage and harmonic wave can avoided and amplifies, can reach active filter again distortion current is made real-Time Compensation and removing, source and the complicated novel filtering of controlling take place and need not to have harmonic wave, it is to utilize the ampere-turn equilibrium relation of supply transformer winding to realize filtering, the spy is called induction filtering, cooperate the design and the application of zero impedance circuit, can be advanced to Autocompensation to filtering and coordinate mutually, constitute rectifier transformer with the humorous wave energy of improvement with harmonic shielding.
The technical solution adopted in the present invention is to draw the self coupling tap in the middle of secondary side's winding of supply transformer winding, tap is divided into pair side's winding the common winding and the winding of connecting of two sections similar autotransformers, both keep close-coupled, former side's winding of these two sections windings and its homophase constitutes three-winding arranged concentric on the cylinder iron core, it is in parallel that sense LC branch road is held in two ends and the compensation that is arranged in the winding in intermediate layer, and impedance of fundamental frequency value X
LMuch smaller than induction reactance value X
C, the intermediate layer winding is the shielding winding, and its equivalent impedance is zero, and the two ends of secondary side's winding are connected with supply load.
Principle of the present invention: establishing the filtering harmonic number is n, under the n of correspondence overtones band, and nX
L-X
C/ n=0, this zero impedance branch road is attracted to the series connection winding to the nth harmonic electric current to be passed through, the harmonic flux of series connection winding because of producing by harmonic current, must wear the chain common winding and promptly shield winding, induct immediately reverse current and be the loop of the latter to hold the sense branch road, the impedance that connects winding and external branch road in this loop is zero, there is not step-down by electric current, thereby need not corresponding electromotive force and keep, then the magnetic potential of this two winding forces harmonic flux to be offset entirely on the contrary, do not wear the former side's winding of the outer field homophase of chain so there is the residue harmonic flux, realized decoupling zero effect, make harmonic current can not cross air gap and scurry former side's electrical network the harmonic shielding that is the magnetic coupling of former side's winding.
The present invention compared with prior art has tangible advantage:
1, the present invention catches the harmonic wave source to administer, in valve side and harmonic current porch near rectifier transformer, the Low ESR effect that the appearance sense LC branch road that utilizes the tap of secondary side's self coupling to draw to connect constitutes harmonic frequency, dredge harmonic current and return load nearby through the series connection winding, and the harmonic flux that the series connection winding produces by harmonic current, the conductively-closed winding counter magnetic flux of inducting is offset immediately again, has stoped harmonic current to transmit to primary winding.This is equivalent to be provided with a barrier in harmonic wave injection place, from the source harmonic wave is intercepted, but can be passed through as usual fundamental current.
2, the present invention has developed the potential of transformer, the filter action that has utilized the transformer ampere-turn equilibrium to have.Though it is similar to the branch road of passive filtering that the C-L element that connects is drawn in the self coupling tap, the electric current of this circuit and voltage are subjected to the restriction of the electromagnetic relationship of tap two ends coupling winding, and the misgivings that do not have resonance overvoltage and harmonic wave to amplify are so can select X for use
L=X
C/ n
2And needn't avoid resonance point, obtain the inaccessible filter effect of passive filtering.It is zero condition that the present invention also utilizes the equivalent impedance of shielding winding, there is not pressure drop during by loop at induced current, the electromotive force that need not the harmonic flux generation is kept, the counter magnetic flux that the whole conductively-closed windings of harmonic flux that the series connection winding is produced are inducted is offset, the latter is similar in appearance to the harmonic compensation effect of active power filtering, it is to utilize the self coupling of coupling winding to respond to finish, the harmonic wave generation source and the control system that need not active power filtering realize, obtain effect same, its technical difficulty and cost are much cheap.
3, the present invention is when administering mains by harmonics, has also prevented the transmission of harmonic wave in Transformer Winding, harmonic wave is effectively administered the infringement of transformer, thereby improved the overall benefit of rectifying conversion.Under the normal power-frequency voltage, the capacitive reactance X of compensation branch road
CThan induction reactance X
LMuch bigger, reactive load is played compensating action.Reactive power compensation is arranged in the low-pressure side of drawing tap, this has not only reduced the electric pressure of compensation arrangement and switchgear thereof, reduced current values by Transformer Winding, and avoided the net side joint to go into compensation will preventing that capacitive loop and electrical network induction reactance from the problem that influences of resonance may take place, when not having centre tap to draw to connect reactive power compensation and filter apparatus as secondary side's winding of rectifier transformer, just passive or active filter to be installed on former side's net side high voltage bus, no matter its filter effect how, idle and the harmonic component that load current causes all will enter high voltage bus by this transformer, just in winding and iron core, increase supplementary load loss heating and noise vibration, cause material and cost to increase, relatively, the present invention has got rid of the adverse effect that these undesirable constituentss are brought.This inherently safe to power grid security and compensation equipment all is beneficial to.
4, in polyphase rectifier, the present invention has remedied the weak point of simple increase pulse number P.Increase the pulse number P of rectifier, it is one of important method of reduced harmonic, increase with the P value, the harmonic number of characteristic harmonics maximum increases thereupon, the relative value of harmonic current content then is inversely proportional to therewith and reduces, do the quantity that will increase converter and the complexity of control thereof like this, also to adjust the wiring combination and the adjacent alternate displacement angle thereof of transformer pair side, this not only will increase the consumption and the cost of material, and the effect that is difficult to accomplish comprehensive harmonic carcellation electric current, particularly the uncharacteristic harmonics of Cun Zaiing is can administer by increasing the P value.Relatively, the present invention does not have above-mentioned shortcoming, and this has not only improved filter effect, brings economy yet, and is even better technically.
[description of drawings]
Fig. 1 is a single-phase rectifier transformer key wiring diagram of the present invention
Fig. 2 is the layout schematic diagram of single-phase rectifier transformer winding of the present invention
Fig. 3 is the equivalent circuit diagram of single-phase rectifier transformer of the present invention
Fig. 4 is the key wiring diagram of three-phase six pulsation rectifier transformers of the present invention
Fig. 5 is the voltage phasor-diagram of three-phase six pulsation rectifier transformers of the present invention
Fig. 6 is the key wiring diagram of six phase 12 pulse rectification transformers of the present invention
[embodiment]
Further specify concrete structure of the present invention below in conjunction with embodiments of the invention
Embodiment 1:
As Figure 1-3, present embodiment is single-phase self-coupling compensation and harmonic shielding rectifier transformer, comprise former side's winding 1, pair side's winding and cylinder iron core 4, draw the self coupling tap and pair side's winding is divided into winding 2 and 3 in the centre of pair side's winding, three windings are arranged on the cylinder iron core 4 jointly, pair side's winding 3 is arranged in the internal layer near cylinder iron core 4, former side's winding 1 is arranged in outermost layer, pair side's winding 2 is arranged between secondary side's winding 3 and the former side's winding 1, the two ends of pair side's winding 2 hold sense LC branch road 7 with compensation and join, the two ends of former side's winding 1 link to each other with electric network source, supply load 5 and two pair side's windings 2 of connecting and 3 parallel connections.
Present embodiment can be single-phase rectification load or the power supply of arc furnace load, also can be the single-phase traction transformer of electric railway or traction transformer that two single-phase transformers are combined as the V-arrangement wiring uses, though the latter's outlet side directly is not connected with converter, but the load character of power supply is similar, can utilize secondary side's winding centre to draw tap and improve reactive power compensation and filtering.Short-circuit impedance that predicts according to the short circuit respectively between two windings and the equivalent impedance Z that is converted into same voltage
12, Z
13, Z
23, each equivalent impedance among Fig. 3 can be tried to achieve by following formula:
Z
1＝0.5(Z
12+Z
13-Z
23)
Z
2＝0.5(Z
12+Z
23-Z
13)
Z
3＝0.5(Z
13+Z
23-Z
12)
Short-circuit impedance between two windings is directly proportional with distance between both center lines, then Z
12, Z
13And Z
23Respectively and the width of cloth between its subscript winding to distance a
12, a
23And a
13Proportional, find out a by Fig. 2
12+ a
23=a
13, then middle winding Z
2=0.5 (Z
12+ Z
23-Z
13), should with a
12+ a
23-a
13Proportional, by corresponding distance relation formula, be not difficult to learn Z
2=0, so the three-winding middle winding equivalent impedance of arranged concentric must be zero.Like this, the just suitable work of intermediate layer winding that is between skin and the internal layer shields winding.
I among Fig. 3
nBe the harmonic current that contains by the series connection winding, I
FFor shielding the inverse filtering electric current that winding is inducted.Z
FHold the filtering impedance of sense LC branch road under frequency filtering for compensation, the wattage of establishing winding 2 and 3 is respectively W
2, W
3, by the ampere-turn equilibrium principle of coupling winding electric magnetic induction, I
FW
2Should with I
nW
3Equate, the harmonic flux of then wearing this two winding of chain must equal and opposite in direction and direction is forced to offset on the contrary, can not there be unnecessary harmonic flux to wear former side's winding of chain arranged concentric, though closed loop circuit has electric current to pass through, but the zero impedance in this loop does not have pressure drop, need not harmonic wave electromotive force and harmonic magnetic potential and keep, can be to the harmonic current (I that occurs in the load current
n) removed immediately, voltage and electric current that secondary side's winding is passed through still are sinusoid, have stoped because of I
nThere is the increase that causes transformer copper iron loss, particularly former side's electrical network played the harmonic shielding buffer action.Z among the figure
SThe equivalent impedance of representative system, this branch road Z
1+ Z
SWith Z
2Parallel connection is because of Z
2=0, so former side's winding and system's electrical network can not play shunting action to harmonic current, this further shows Z
2=0 importance.
In harmonic current, relatively large with the content of low-order harmonic, press characteristic harmonics and consider, the n value of this shielding harmonic wave, desirable 3 and 5 get final product.
Embodiment 2:
Present embodiment is Autocompensation and harmonic shielding three-phase rectifier transformer, former side's winding can be star or delta connection (not drawing among the figure), the winding employing of pair side is prolonged the edge joint line and is had tapped extend-triangle connection, as shown in Figure 4, in the extend-triangle, △ abc and △ uvw are equilateral triangles, meet end points a in the extend-triangle, b, c draws centre tap, the external end points u of extend-triangle, v, w is for prolonging limit three-phase output end point, in meet end points a, b, c and external end points u, v, the winding that connects between the w is for prolonging limit winding ua, vb, wc, in meet end points a, b, the winding that connects between the c is leg-of-mutton phase winding ab, bc, ca, prolong limit three-phase output end point u, v, w is connected with the three phase rectifier equipment 6 of valve side respectively, and the rectifications of formation six pulsation are exported and linked to each other with supply load 5; In connect centre tap that end points a, b, c draw and hold sense LC branch road 7 with compensation respectively and join.Its leg-of-mutton phase winding is equivalent to the common winding 2 of autotransformer, plays shielding action in filtering, prolongs the series connection winding 3 that the limit winding is equivalent to autotransformer; Same phase prolong limit winding, leg-of-mutton phase winding and former side's winding 1 arranged concentric on cylinder iron core 4.Produce magnetic flux by harmonic current, similar to above-mentioned single-phase rectifier transformer, be shielded the counter magnetic flux that winding inducts by homophase and offset.Prolong limit winding phase voltage U
eLeg-of-mutton phase winding phase voltage U with homophase
d, the neighbour prolongs limit winding phase voltage U mutually
eWith the phase voltage U that prolongs limit winding output
2The phasor triangular relationship that constitutes as shown in Figure 5, θ prolongs the phase shift angle that the limit produces, and promptly prolongs the phase voltage U of limit winding output
2Prolong limit winding phase voltage U relatively
eWith leg-of-mutton phase winding phase voltage U
dThe phase shift angle that sum produces can be got by the geometrical relationship of phasor:
U
e/Sinθ＝(U
e+U
d)/Sin(60°-θ)＝U
2/Sin120°
Following formula is represented Yan Bian winding phase voltage U
eWith prolong limit winding phase voltage U
2With the corresponding relation of angle of displacement θ, in view of the above can be in order to the phase place of coordination with associated connections, the n value of shielding harmonic wave is chosen as 5 and 7.
Embodiment 3: present embodiment two extend-triangles in pair side of serving as reasons are formed 6 Autocompensation and the harmonic shielding rectifier transformers of 12 arteries and veins mutually.As shown in Figure 6, two groups of three-phases output of pair side's winding is connected with separately three phase rectifier equipment 6 respectively, and link to each other with supply load 5, two rectifying installations 6 contain the thyristor that can form 12 pulsation phases, the interphase potential difference is 30 °, the Autocompensation of drawing in two extend-triangle windings and the self coupling tap of mask filter are held sense LC branch road 7 with the compensation that adds and are linked to each other; Original rectifier transformer often will compensate by traditional wired and filter apparatus is contained on the net side high voltage bus, the present invention compensation hold sense LC branch road 7 from the net sidesway near net valve side can be compensated immediately and remove so that enter the idle and harmonic current of Transformer Winding.
Determining of 12 pulsation angular displacement: the interphase potential differences of 12 pulsation phases are 360 °/12=30 °; For this reason, should make the phase voltage U that prolongs limit winding output of an extend-triangle of secondary side's winding
2Prolong limit winding phase voltage U relatively
eWith leg-of-mutton phase winding phase voltage U
dThe Phase advance that sum produces, the phase voltage U that prolongs limit winding output of another extend-triangle
2Prolong limit winding phase voltage U relatively
eWith leg-of-mutton phase winding phase voltage U
dThe Phase delay that sum produces, and reach and after the phase angle θ that moves be 15 °, know by above-mentioned relation, get θ=15 °, then U
e/ U
2=Sin15 °/Sin120 °=0.2989, U
d/ U
2=0.5176, (U
e+ U
d)/U
2=Sin (60 °-15 °)/Sin120 °=0.8165, be U so the turn ratio of limit winding and delta windings is prolonged in maintenance
e/ U
d=0.2989/0.5176=0.5775, obtaining phase shift is 15 °, but note angle reach with after the difference that moves so that phase difference value is 30 °, just can obtain the 12 same rectification effects of mutually pulsing of original direct-current transmission converter transformer pair side between the two with star and delta connection formation.The centre tap that pair side's winding is drawn is connected with the compensation equipment that adds, and helps removing the bad interference of harmful components such as idle and harmonic wave in the load current to transformer and network system.Maximum characteristic harmonics number of times to 12 pulsation phases is pressed P ± 1, so the n value can be taken as 11 and 13.
Two groups of rectifying installations adopt series wiring among Fig. 6, are applicable to the converter transformer of high voltage direct current transmission; Electric current is big if the direct voltage of AC-DC is not high, and then two groups of rectifying installations shown in the figure change into and tie.
Claims (6)
1. Autocompensation and harmonic shielding rectifier transformer, comprise former side's winding (1), pair side's winding, cylinder iron core (4), it is characterized in that: in the middle of secondary side's winding of Autocompensation and harmonic shielding rectifier transformer, draw the self coupling tap, tap is divided into pair side's winding common winding (2) and connects (3) two sections of windings, common winding (2) keeps close-coupled with the winding of connecting (3), and go up at cylinder iron core (4) with former side's winding (1) of its homophase and to constitute three-winding arranged concentric, be arranged in the two ends of common winding (2) in intermediate layer and electric capacity and inductance series arm (7) and link, and first-harmonic capacitor value (X
C) be taken as first-harmonic induction reactance value (X
L) n
2Doubly, n is the filtering harmonic number, and common winding (2) is zero for shielding winding, its equivalent impedance, the two ends of former side's winding (1) link to each other with electric network source, and supply load (5) is connected with the common winding (2) of series connection and the two ends of secondary side's winding of series connection winding (3) composition.
2. Autocompensation according to claim 1 and harmonic shielding rectifier transformer is characterized in that: series connection winding (3) is arranged in the internal layer near cylinder iron core (4), and former side's winding (1) is arranged in outermost layer.
3. Autocompensation and harmonic shielding three-phase rectifier transformer, it is characterized in that: former side's winding (1) is star or delta connection, pair side's winding adopts has the tapped extend-triangle mode of connection, meet end points (a in the extend-triangle, b, c) draw centre tap, external end points (the u of extend-triangle, v, w) for prolonging limit three-phase output end point, in meet end points (a, b, c) with external end points (u, v, w) winding that connects between is for prolonging limit winding (ua, vb, wc), in meet end points (a, b, c) winding that connects between is leg-of-mutton phase winding (ab, bc, ca), prolong limit three-phase output end point and be connected with three phase rectifier equipment (6) respectively, the rectifications of formation six pulsation are exported and are linked to each other with supply load (5); Centre tap joins with external electric capacity and inductance series arm (7) respectively; Described leg-of-mutton phase winding is a common winding, and corresponding harmonic wave is played shielding action, and the described limit winding that prolongs is the series connection winding; Prolong limit winding, leg-of-mutton phase winding and former side's winding (1) of same phase are gone up arranged concentric at cylinder iron core (4).
4. Autocompensation according to claim 3 and harmonic shielding three-phase rectifier transformer is characterized in that: connect voltage between each 2 point (ua, vb, wc) of end points (a, b, c) in the external end points of described extend-triangle (u, v, w) and its homophase for prolonging limit winding phase voltage U
e, the voltage between each adjacent phase 2 point (uw, wv, vu) of the external end points of extend-triangle (u, v, w) is the phase voltage U that prolongs limit winding output
2, in the voltage that connects between each homophase 2 point (ac, cb, ba) of end points (a, b, c) be leg-of-mutton phase winding phase voltage U
d, three's pass is: U
e/ Sin θ=(U
e+ U
d)/Sin (60 °-θ)=U
2/ Sin120 °, promptly
" θ " is for prolonging the phase voltage U of limit winding output
2Prolong limit winding phase voltage U relatively
eWith leg-of-mutton phase winding phase voltage U
dThe phase shift angle that sum produces.
5. Autocompensation according to claim 3 and harmonic shielding three-phase rectifier transformer, it is characterized in that: 6 phases 12 pulsation Autocompensation and the harmonic shielding rectifier transformers of secondary side's winding for forming by two extend-triangle modes of connection, two groups of three-phases output of pair side's winding is connected with separately three phase rectifier equipment (6) respectively, two three phase rectifier equipment (6) contain the thyristor that forms 12 pulsation phases, the interphase potential difference is 30 °, connect end points in two extend-triangles and draw the centre tap of Autocompensation and mask filter, link to each other with inductance series arm (7) with external electric capacity.
6. Autocompensation according to claim 5 and harmonic shielding three-phase rectifier transformer is characterized in that: the phase voltage U that prolongs limit winding output in the extend-triangle wiring of secondary side's winding
2Prolong limit winding phase voltage U relatively
eWith leg-of-mutton phase winding phase voltage U
dThe Phase advance that sum produces, the phase voltage U that prolongs limit winding output in another extend-triangle wiring
2Prolong limit winding phase voltage U relatively
eWith leg-of-mutton phase winding phase voltage U
dThe Phase delay that sum produces, and reach and after the phase angle θ that moves be 15 °; That realizes 15 ° of displacements prolongs limit winding phase voltage U
eProlong the phase voltage U of limit winding output relatively
2Ratio U
e/ U
2Be 0.2989, leg-of-mutton phase winding phase voltage U
dTo prolonging the phase voltage U of limit winding output
2Ratio U
d/ U
2Be 0.5176, prolong limit winding phase voltage U
eWith leg-of-mutton phase winding phase voltage U
dSum is to prolonging the phase voltage U of limit winding output
2Ratio (U
e+ U
d)/U
2Be 0.8165.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101106772A CN100391078C (en) | 2003-12-19 | 2003-12-19 | Rectification transformers with self coupling compensation and resournace shield |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101106772A CN100391078C (en) | 2003-12-19 | 2003-12-19 | Rectification transformers with self coupling compensation and resournace shield |
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| Publication Number | Publication Date |
|---|---|
| CN1553553A CN1553553A (en) | 2004-12-08 |
| CN100391078C true CN100391078C (en) | 2008-05-28 |
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ID=34335707
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|---|---|---|---|
| CNB2003101106772A Expired - Fee Related CN100391078C (en) | 2003-12-19 | 2003-12-19 | Rectification transformers with self coupling compensation and resournace shield |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1665112A (en) * | 2005-04-05 | 2005-09-07 | 刘福生 | Autocompensation and harmonic wave shielding converter transformer |
| CN100352124C (en) * | 2005-05-30 | 2007-11-28 | 安徽工业大学 | Method for controlling, restraining and eliminating voltage network harmonic of transformer magnetic circuit |
| CN101919150B (en) * | 2007-09-18 | 2013-12-18 | 菲莱贝克能源公司 | Current waveform construction to generate AC power with low harmonic distortion from localized energy sources |
| CN102176625A (en) * | 2011-03-14 | 2011-09-07 | 镇江康士伯船舶电气有限公司 | Harmonic suppression transformer |
| CN103515960B (en) * | 2013-09-30 | 2016-01-20 | 国网湖南省电力公司 | The hybrid power filtering of magnetic integrated form and reactive compensation system |
| CN103956739A (en) * | 2014-04-25 | 2014-07-30 | 湖南大学 | Method for achieving electric power filtering and reactive compensation of direct-current transmission converter station |
| CN104092270A (en) * | 2014-06-06 | 2014-10-08 | 湖南大学 | Direct-current power supply system applicable to pure electric bus charging stations and charging station thereof |
| CN105204562A (en) * | 2015-09-11 | 2015-12-30 | 江西科旺科技有限公司 | Intelligent three-phase wide-range voltage stabilization and transformation integrated voltage stabilizer |
| CN110365220B (en) * | 2019-08-21 | 2020-08-14 | 曹亮平 | TLC resonant circuit and power converter applied by same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62269508A (en) * | 1986-05-19 | 1987-11-24 | Yokogawa Hewlett Packard Ltd | Noise reduction reduction device |
| CN86210400U (en) * | 1986-12-18 | 1987-12-16 | 中国科学院广州电子技术研究所 | Voltage stabilizer for three-phase supra-insulation anti-interference power supply |
| CN1318851A (en) * | 2001-06-06 | 2001-10-24 | 刘福生 | Harmonic wave shielding balanced transfermer |
-
2003
- 2003-12-19 CN CNB2003101106772A patent/CN100391078C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62269508A (en) * | 1986-05-19 | 1987-11-24 | Yokogawa Hewlett Packard Ltd | Noise reduction reduction device |
| CN86210400U (en) * | 1986-12-18 | 1987-12-16 | 中国科学院广州电子技术研究所 | Voltage stabilizer for three-phase supra-insulation anti-interference power supply |
| CN1318851A (en) * | 2001-06-06 | 2001-10-24 | 刘福生 | Harmonic wave shielding balanced transfermer |
Also Published As
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| CN1553553A (en) | 2004-12-08 |
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