EP3824550A2 - Vorrichtung und verfahren zum betreiben einer impedanzvariablen last am planartransformator im hochfrequenten betrieb i - Google Patents
Vorrichtung und verfahren zum betreiben einer impedanzvariablen last am planartransformator im hochfrequenten betrieb iInfo
- Publication number
- EP3824550A2 EP3824550A2 EP19758326.3A EP19758326A EP3824550A2 EP 3824550 A2 EP3824550 A2 EP 3824550A2 EP 19758326 A EP19758326 A EP 19758326A EP 3824550 A2 EP3824550 A2 EP 3824550A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- impedance
- planar transformer
- primary
- operating frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
- H03H7/383—Impedance-matching networks comprising distributed impedance elements together with lumped impedance elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/064—Circuit arrangements for actuating electromagnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F19/00—Fixed transformers or mutual inductances of the signal type
- H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/09—Filters comprising mutual inductance
Definitions
- the invention relates to a device and a method for operating an impedance-variable load on a planar transformer in high-frequency operation.
- a source of a signal is connected to a load by means of a transmission path.
- a low-impedance source for example 1W
- a low-impedance load that is often variable in its impedance (for example variable around a value of 1W) with the aid of a higher-resistance transmission path (for example 50W) ) connected.
- a first matching network with a (for example fixed) first impedance ratio is usually used between the source and transmission path, and a second matching network with a (for example variable) second impedance ratio between the transmission path and load.
- the signal is transmitted from the source to the load via the first adaptation network, transmission path and second adaptation network.
- the signal typically has components at a fundamental frequency and components at harmonics, that is to say integer multiples of the fundamental frequency.
- transformers as matching networks with a fixed impedance ratio.
- Transformers have an input coil ("primary turn”) with a first number of turns and an output coil (“secondary turn”) with a second number of turns, as well as a ratio called the winding ratio between the second number of turns and the first number of turns.
- a transformer with a winding ratio N transforms the voltage between input and output down by a factor N
- Planar transformers are a special implementation of transformers.
- a planar transformer has a primary coil and a secondary coil, which primary and secondary coils are essentially planar and plane-parallel, separated by a dielectric.
- planar transformers are components by means of which a signal is transmitted from an input to an output using distributed inductances and distributed capacitances, with a desired change in the signal impedance. While this change in the low-frequency range is between two real impedances in the ratio of the square of the winding ratio, the relationship is more complicated in the case of essentially non-real high-frequency impedances and in the case of essentially distributed capacitance and inductance coatings in the higher-frequency range.
- the primary coil with mirror symmetry (“primary-side symmetrical planar transformer”). It is also accessible to the prior art, in the case of an even number of turns of the secondary coil, that half of the turns of the secondary coil are viewed from a first angle of view of the planar transformer, which is suitable for assessing the sense of the turn, the first turn sense above, the other half of the turns in , viewed from the first point of view, to arrange the opposite turn sense below the primary coil (“secondary-side symmetrical planar transformer”), which first and second half turns are electrically conductively connected to each other in the area of the center of rotation of the turns.
- a planar transformer can be fully symmetrical, that is, symmetrical on the primary side and secondary side. metric, be constructed.
- the source is a differential amplifier arrangement
- a point on the primary side with a symmetrical planar transformer in the middle of the primary winding results in a high-frequency point on earth, via which a supply voltage can be supplied, with only minor requirements for blocking the output signal against the voltage supply ,
- a symmetrical one on the secondary side
- a planar transformer results in a point in the middle of the secondary coil that is high-frequency in terms of technology; According to the prior art, this is used, for example, to apply a DC voltage to an antenna connection or to tap it from an antenna connection.
- the first matching networks harmonic matching structures, by means of which, depending on the amount and phase, desired values of load impedances for the fundamental wave and for the harmonic waves can be achieved.
- a control of the impedances also at the harmonics can be used advantageously in order to achieve time profiles of current and voltage at the output of a source, by means of which particularly efficient operation of the source is achieved.
- a load with a variable impedance typically exhibits a variance in the input impedance not only for the fundamental wave, but also for the harmonics of the signal.
- the second matching network with a variable impedance ratio according to the prior art is typically only suitable for absorbing the variation in the load impedance at the fundamental frequency of the signal, but it usually does not allow any impedance matching for the harmonics.
- a harmonious adaptation structure as the first adaptation network is hereafter completed without further measures on a side facing the transmission path at the fundamental frequency with a defined impedance; at multiples of the basic frequency, however, there are variable impedances.
- Such variable harmonic terminations have a disadvantageous influence on the time profiles of current and voltage at the output of the source.
- the prior art knows structures by means of which the harmonics are derived to ground, for example frequency-selective suction circuits or crossovers.
- a derivative to ground represents, for example, a short circuit in the respective harmonic and offers a defined impedance in the respective harmonic;
- the first adaptation network can be designed so that the source can always be operated with high efficiency.
- a disadvantage of the prior art is in particular that such measures for deriving the harmonics are associated with a high outlay.
- Another disadvantage of the prior art is that such measures for deriving the harmonics always involve a loss of signal power, which reduces the overall efficiency.
- the aim of a development would therefore be to provide measures by means of which while weakening the disadvantages of the prior art, with a harmonious adaptation, a consistently high efficiency of a source can also be achieved if the source is operated to drive an impedance-variable load.
- planar transformer I The objective of low-loss operation of an impedance-variable load without having the disadvantages of the prior art is solved by the invention “frequency-selective, non-transparent planar transformer I”.
- This invention relates to a method for operating an impedance-variable load on a device consisting of a planar transformer, consisting of at least one primary and a secondary side, which can be operated as an input or output side, comprising an image of a virtual RF ground in the Point of symmetry of one of the secondary sides to a first impedance.
- a "planar transformer” is a special type of transformer that is characterized by a flat design. In terms of radio frequency, a planar transformer is a distributed structure with capacitive and inductive components.
- the inductive components are dominated by the coils; the capacitive components consist on the one hand of the capacitance between the primary and secondary coils, and on the other hand of a possible capacity between two turns within the primary or the secondary coil itself, provided that these consist of (partial) coils with more than one turn ,
- the transmission of a signal from the output to the input of the fully symmetrical planar transformer has a maximum loss if this output with an open circuit (short circuit) is completed.
- planar transformer For all load impedances normally to be expected at the output of the planar transformer, which is terminated with a transmission path, second matching network and load, the transmission from the output to the input is low - the planar transformer therefore provides an impedance on the input side at the desired harmonic, which impedance does not go from one to the output of the planar transformer ("reflected") signal depends:
- the planar transformer is non-transparent for these harmonics, the harmonic termination on the input side is independent of the state of the load and the second matching network.
- the high-frequency planar transformer can conventionally consist of two levels, a first level being the primary side and the other level, which for illustration is arranged parallel to the first level, can be the secondary side.
- the planar transformer can furthermore have more than just one primary or secondary level, in various combinations.
- the planar transformer according to the invention can have a primary side (here: “side” synonymous with “plane” or “coil”), which, as in a sandwich arrangement, is arranged centrally between two secondary sides (here: “side te "is equivalent to” levels ",” halves ",” coils ").
- Half of the turns of the secondary coil are above, the other half below the primary coil. In the middle there is a virtual mass 1 .
- both halves When viewed from above, both halves appear in two opposite turns; this must be so because in one half the current flows "from the inside out” and the other half “from the outside in”, but the (partial) voltages that are induced in both halves should add up, instead of lifting each other up.
- a further embodiment of the planar transformer for carrying out the method according to the invention can be made from a stepwise parallel connection of primary and secondary coils.
- an arrangement can have three primary coils and four secondary coils. These can be arranged alternately: secondary coil, primary coil, secondary coil, primary coil, secondary coil, primary coil, secondary coil.
- the primary coils are all connected in parallel, which means that they represent a single coil with a single turn, only that this turn consists of three parallel "wires”.
- Two adjacent pairs of the secondary coils (both upper and the lower two) are connected in parallel in a manner that is as a pair.
- planar transformer which embodiment is advantageously suitable for implementing the method according to the invention, has more than one primary coil.
- planar transformer which embodiment is advantageously suitable for implementing the method according to the invention, at least some of the primary coils are electrically connected in parallel with one another.
- a planar transformer which is advantageously suitable as an embodiment for implementing the method according to the invention, at least some of the secondary coils are electrically connected in parallel with one another.
- a planar transformer which extends over seven planes which are essentially plane-parallel to one another, serves as an illustrative example; in a row of successive levels perpendicular to the levels referred to as first level S 1, second level P1, third level S2, fourth level P2, fifth level S3, sixth level P3 and seventh level S4.
- Three, for example geometrically congruent, primary coils are arranged in the second level P1, the fourth level P2 and the sixth level P3, the first inputs of all primary coils being electrically short-circuited with one another, and the second inputs in each case of all primary coils are electrically shorted together.
- a first secondary coil consists of a first coil section T1 with a first number of turns of a first winding sense in the first level S1 and a fourth coil section T4 of the first number of turns of the first winding sense opposite in the seventh level S4;
- a second secondary coil consists of a second coil section T2 of the first number of turns of the first winding sense in the third level S2 and of a third coil section T3 of the first number of turns of the first winding sense opposite in the fifth level S3; Viewed in the direction of rotation of the turns, the inner ends of the first coil section T1, the second coil section T2, the third coil section T3 and the fourth coil section T4 are connected to one another in an electrically conductive manner; Viewed in the direction of rotation of the turns, the outer ends of the first coil section T1 and the second coil section T2 are connected to one another in an electrically conductive manner; Viewed in the direction of rotation of the turns, the outer ends of the third coil section T3 and the fourth coil section T4 are connected to
- a transistor with a relatively high output power and at the same time a relatively low operating voltage delivers its output power particularly efficiently to a low-bulk load:
- a modern LDMOS with 130V breakdown voltage is typically operated with a 50V supply voltage. When fully controlled, the high-frequency output voltage swings by +/- 50V around 50V.
- the output impedance is 50V / 40A, i.e. in the region of 1 ohm: This is only determined by the operating voltage and output power, so it is absolutely about 1 here Ohm load impedance required.
- an adaptation network is required that maps 50 ohms to 1 ohm.
- a planar transformer according to the invention can be part of this adaptation network.
- the efficiency of the amplifier ie the combination of transistor and matching network, is determined both by the efficiency with which the transistor is operated and by the losses in the matching network, particularly in the planar transformer.
- the losses in the adaptation network are also influenced by the impedance with which the adaptation network is fired on the input and output side. If, for example, the primary coil is driven by a push-pull amplifier, the differential output impedance of the push-pull amplifier can be seen at the end of the primary coil. On the other hand, there are, for example, 50 ohms at the output of the secondary coil.
- the turn ratio is the number of turns of the secondary coil divided by the number of turns of the primary coil. If a source has a very high source power (e.g. 2500W based on the operating voltage of the source)
- planar transformer with a turn ratio significantly greater than one appears to be advantageous for adaptation.
- a plan transformer with one turn in the primary coil and three turns each above and below the primary coil in the secondary coil can be selected. It can be seen that such planar transformers with a high turn ratio have a minimum loss when terminating on the output and input side with impedances that are unfavorably high for the operation of the source or the adaptation of the load, but disadvantageously high losses when terminating with the existing load and source impedances ,
- the load impedance by which the losses in the matching network are minimized depends on the line impedance of the "line" secondary coil, with the primary coil as the reference ground.
- This line impedance is reduced according to the invention by connecting two halves of the secondary coil in parallel here.
- Level PI, the second level PI and the third level S2, the third level S2 and the fourth level P2, the fourth level P2 and the fifth level S3, the fifth level S3 and the sixth level P3, the sixth level P3 and the seventh Level S4 with the same dielectric in each case expires a first distance in each case between the second level P1 and the third level S2, between the third level S2 and the fourth level P2, between the fourth level P2 and the fifth level S3 and between the fifth level S3 and the sixth level P3 twice as large as a second distance between the first level S1 and the second level P1 and between the two sixth level P3 and seventh level S4 can be selected. As a result, all turns of the secondary coil are provided with similar line impedances.
- the device according to the invention can therefore map the correct ratio of input to output impedance, for example 50 ohms, to a suitable load impedance for the transistor, and at the same time offer low losses at precisely this 50 ohms as load impedance.
- the method according to the invention can furthermore select a route to a point of symmetry along one of the secondary sides to the exit of the secondary side equal to an odd (or even) multiple of a quarter of a wavelength of a desired harmonic; and / or terminating the output of the secondary side with an open circuit (or short circuit).
- a method for operating a planar transformer consisting of a primary and a secondary side can be used to solve the objective problem, wherein that primary side has at least one first coil and that secondary side has at least one second coil, which second coil is constructed symmetrically and a point of symmetry and has a differential output with two branches, the second coil between the point of symmetry and a first branch of the differential output has a distributed inductance and a distributed capacitance to the first coil, which is used to select a resonance frequency between distributed inductance and distributed capacitance, which is equal to a multiple of a preferred operating frequency.
- the task can also be achieved by a method for operating a planar transformer consisting of a primary and a secondary side, with that primary side having at least one first coil and that secondary side having at least one second coil, which second coil is constructed symmetrically and a virtual one when the planar transformer is operated differentially High-frequency mass in the point of symmetry can be solved, which comprises selecting an electrical length of the secondary coil smaller than half the wavelength at a preferred operating frequency and equal to an integral multiple of an integer fraction of half the wavelength at the preferred operating frequency.
- a further solution to the objective task is provided by a method for operating a planar transformer.
- This has a preferred operating frequency and consists of a primary and a secondary side, which primary side has an input with a first input impedance at the preferred operating frequency and which secondary side has an output with a first output impedance at the preferred operating frequency, with a first source impedance and a first Load impedance, where at the preferred operating frequency the first source impedance is complex conjugate when the output is terminated with the first load impedance of the input impedance, and the first load impedance is complex conjugate when the input is terminated with the first source impedance of the output impedance, with that primary side having at least a first coil and that Secondary side has at least one second coil, which second coil is constructed symmetrically and has a virtual radio frequency mass at the point of symmetry when the planar transformer is operating differentially, which is a selection one electrical length of the secondary coil is less than half the wavelength at the operating frequency and is an integer multiple of an integral fraction
- One device which can use the above-mentioned methods to achieve the object according to the invention is a planar transformer, which has at least one primary and one secondary side, which can be operated as input and output side, and a controller, the controller has programming which has the steps according to one of the preceding claims.
- a planar transformer as the device according to the invention, can have a preferred operating frequency and can consist of a primary and a secondary side, with that primary side having at least one first coil and that secondary side having at least one second coil, the second coil being constructed symmetrically and with differential operation of the planar transformer has a virtual high-frequency mass at the point of symmetry.
- This embodiment is characterized in that an electrical length of the secondary coil is less than half the wavelength at the operating frequency and is equal to an integral multiple of an integral fraction of half the wavelength at the operating frequency.
- Another embodiment of the device is a planar transformer, which has a preferred operating frequency and consists of a primary and a secondary side, wherein that primary side has at least one first coil and that secondary side has at least one second coil, which second coil is constructed symmetrically and a point of symmetry and has a differential output with two branches, the second coil between the point of symmetry and a first branch of the differential output has a distributed inductance and a distributed capacitance to the first coil.
- This embodiment is characterized in that a resonance frequency between the distributed inductance and the distributed capacitance is a multiple of the preferred operating frequency and thus the efficiency is optimized.
- a planar transformer which has a preferred operating frequency and consists of a primary and a secondary side, which primary side has an input with a first input impedance at the preferred operating frequency and which secondary side has an output with a first output impedance at the preferred operating frequency having.
- first source impedance and a first load impedance with the preferred operating frequency the first source impedance complex conjugating at the end of the output with the first load impedance of the input impedance, and the first load impedance complex conjugate at the end of the input with the first source impedance of the output impedance are, wherein that primary side has at least one first coil and that secondary side has at least one second coil, which second coil is constructed symmetrically and has a virtual high-frequency mass at the point of symmetry when the planar transformer is operating differentially.
- the device is further characterized in that an electrical length of the secondary coil is less than half the wavelength at the operating frequency and is an integer multiple of an integer fraction of half the wavelength at the operating frequency.
- the above-mentioned embodiments of the devices can furthermore have a controller, the controller having programming which has the steps according to one of the preceding claims.
- the various embodiments of the planar transformer according to the invention can also be operated in high-frequency operation using the method according to the invention. While this change in the low-frequency range exists between two real impedances in the ratio of the square of the winding ratio, the relationship is more complicated in the case of essentially non-real high-frequency impedances and in the case of essentially distributed capacitance and inductance coatings in the higher-frequency range.
- the high-frequency operation can be 50 kHz ⁇ f ⁇ 10 MHz.
- the capacitance between the primary and secondary coils with the inductance each half of the secondary coil of the fully symmetrical planar transformer forms a blocking circuit.
- symmetrical design means: If the planar transformer is fed differentially, such symmetry leads to the existence of a virtual mass in a symmetry point of the respective coil.
- the device according to the invention and the method according to the invention can also be combined with further, optional and advantageous features.
- the above-mentioned methods, devices and their embodiments to ensure efficiency relate to capacitances between primary and secondary coils. Further embodiments can combine the use of these and the use of the capacities within a coil (secondary coil (s)) in order to achieve increased efficiency.
- the capacitance between two turns of a coil of a plan transformer forms an oscillating circuit with the inductance of the coil.
- the resonance frequency of this resonant circuit is selected such that it falls on the frequency of a harmonic of the signal to be suppressed.
- no signal can be transmitted at the harmonic to be suppressed from the output to the input of the planar transformer.
- the planar transformer provides an impedance for the harmonic to be suppressed, which impedance does not depend on a signal (“reflected”) that strikes the output of the planar transformer. depends:
- the planar transformer is opaque for these harmonics, the harmonic termination on the input side is independent of the state of the load and the second matching network.
- the method according to the invention can therefore be combined with a method for operating an impedance-variable load on a planar transformer, consisting of at least one primary and one secondary side, which can be operated as input and output side, comprising primary and secondary coils, with capacities between turns of a coil with inductors of the coil form an oscillating circuit, which has a selection of a resonance frequency of the oscillating circuit, the resonance frequency falling on a frequency of a harmonic harmonic of an input signal to be suppressed.
- the combined method can have the feature of providing an impedance on the input side of the planar transformer, which does not depend on a signal reflected at the output, so that the planar transformer appears opaque for the harmonic harmonic.
- the method according to the invention for operating a planar transformer consisting of a primary and a secondary side, wherein that primary side has at least one first coil and that secondary side has at least one second coil, which second coil is constructed symmetrically and has a point of symmetry and a differential output with two branches
- Which second coil has a distributed inductance and a distributed capacitance between its windings between the point of symmetry and a first branch of the differential output can further comprise the feature that a resonance frequency between distributed inductance and distributed capacitance is selected equal to a multiple of a preferred operating frequency.
- Another possible combination is the addition of a method for operating a planar transformer, having a preferred operating frequency and Consisting of a primary and a secondary side, which primary side has an input with a first input impedance at the preferred operating frequency and which secondary side has an output with a first output impedance at the preferred operating frequency, with a first source impedance and a first load impedance, with the preferred operating frequency the first source impedance is complex conjugate when the output is terminated with the first load impedance of the input impedance, and the first load impedance is complex conjugate when the input is terminated with the first source impedance of the output impedance, the primary side having at least a first coil and that secondary side having at least a second coil, which second coil is constructed symmetrically and has a virtual high-frequency mass at the point of symmetry during differential operation of the planar transformer, which allows a selection of a resonance frequency between distributed inductance and ve divided capacity equal to a multiple of a preferred operating frequency.
- the various combined embodiments of the planar transformers according to the invention can also be operated in high-frequency operation using the method according to the invention.
- the high-frequency operation can be f> 10 MHz.
- the high-frequency operation can be 50 kHz ⁇ f ⁇ 10 MHz.
- the device according to the invention can comprise a planar transformer, having at least one primary and a secondary side, which can be operated as an input or output side, and a controller, the controller having a programming which comprises the steps according to one of the above method steps having.
- the device according to the invention can comprise a planar transformer, which has a preferred operating frequency and consists of a primary and a secondary side, with that primary side having at least one first coil and that secondary side te has at least one second coil, which second coil is constructed symmetrically and has a point of symmetry and a differential output with two branches, which second coil has a distributed inductance and a distributed capacitance between its turns between the point of symmetry and a first branch of the differential output characterized in that a resonance frequency between the distributed inductance and the distributed capacitance is a multiple of the preferred operating frequency.
- the device according to the invention can comprise a planar transformer, which has a preferred operating frequency and consists of a primary and a secondary side, the primary side of which has an input with a first input impedance at the preferred operating frequency and which secondary side has an output with a first output impedance at the preferred operating frequency, with a first source impedance and a first load impedance, wherein at the preferred operating frequency the first source impedance is complex conjugate when the output is terminated with the first load impedance of the input impedance, and the first load impedance is complex conjugate when the input is terminated with the first source impedance, the latter Primary side has at least one first coil and that secondary side has at least one second coil, which second coil is constructed symmetrically and a virtual Hochf when differential operation of the planar transformer Requirement mass in the point of symmetry, which is characterized in that a resonance frequency between distributed inductance and distributed capacitance is equal to a multiple of the preferred operating frequency.
- Fig. 1 inventive device - a planar transformer
- FIG. 1 shows a device according to the invention, which can carry out a method 100 according to the invention.
- the device 10 consists of a planar transformer 10.
- the high-frequency planar transformer 10, with a variable number of turns in the secondary coil can conventionally consist of two levels, a first level being the primary side and the other level, which is illustratively parallel to the first level is arranged, which can be the secondary side.
- the planar transformer in Figure 1 has more than just a secondary coil.
- the planar transformer according to the invention in FIG. 1 contains a primary side 11 (thick outer line) which, as in a sandwich arrangement, is arranged centrally between two secondary sides 12, 12 '(thin line, thin dashed line).
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Multimedia (AREA)
- Coils Or Transformers For Communication (AREA)
- Coils Of Transformers For General Uses (AREA)
- Ac-Ac Conversion (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018005737 | 2018-07-22 | ||
DE102018009167.9A DE102018009167A1 (de) | 2018-07-22 | 2018-11-22 | Vorrichtung und verfahren zum betreiben einer impendanzvariablen last am planartransformator im hochfrequenten betrieb i |
PCT/DE2019/000193 WO2020020394A2 (de) | 2018-07-22 | 2019-07-22 | Vorrichtung und verfahren zum betreiben einer impedanzvariablen last am planartransformator im hochfrequenten betrieb i |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3824550A2 true EP3824550A2 (de) | 2021-05-26 |
Family
ID=69147876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19758326.3A Withdrawn EP3824550A2 (de) | 2018-07-22 | 2019-07-22 | Vorrichtung und verfahren zum betreiben einer impedanzvariablen last am planartransformator im hochfrequenten betrieb i |
Country Status (6)
Country | Link |
---|---|
US (1) | US20200286656A1 (de) |
EP (1) | EP3824550A2 (de) |
JP (1) | JP2021532566A (de) |
CN (1) | CN112400277A (de) |
DE (1) | DE102018009167A1 (de) |
WO (1) | WO2020020394A2 (de) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3487461B2 (ja) * | 1994-12-17 | 2004-01-19 | ソニー株式会社 | 変成器及び増幅器 |
EP0935263B1 (de) * | 1998-02-05 | 2004-05-26 | City University of Hong Kong | Betriebstechniken für kernlose PCB-Transformatoren |
US6683510B1 (en) * | 2002-08-08 | 2004-01-27 | Northrop Grumman Corporation | Ultra-wideband planar coupled spiral balun |
US8643461B2 (en) * | 2011-04-28 | 2014-02-04 | Globalfoundries Singapore Pte. Ltd. | Integrated transformer |
-
2018
- 2018-11-22 DE DE102018009167.9A patent/DE102018009167A1/de not_active Withdrawn
-
2019
- 2019-07-22 EP EP19758326.3A patent/EP3824550A2/de not_active Withdrawn
- 2019-07-22 CN CN201980008357.5A patent/CN112400277A/zh active Pending
- 2019-07-22 WO PCT/DE2019/000193 patent/WO2020020394A2/de unknown
- 2019-07-22 JP JP2020530306A patent/JP2021532566A/ja active Pending
- 2019-07-22 US US16/754,534 patent/US20200286656A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
US20200286656A1 (en) | 2020-09-10 |
JP2021532566A (ja) | 2021-11-25 |
DE102018009167A1 (de) | 2020-01-23 |
WO2020020394A3 (de) | 2020-03-26 |
WO2020020394A2 (de) | 2020-01-30 |
CN112400277A (zh) | 2021-02-23 |
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