EP3824557A1 - Apparatus and method for operating a variable-impedance load on the planar transformer in high-frequency mode ii - Google Patents
Apparatus and method for operating a variable-impedance load on the planar transformer in high-frequency mode iiInfo
- Publication number
- EP3824557A1 EP3824557A1 EP19759279.3A EP19759279A EP3824557A1 EP 3824557 A1 EP3824557 A1 EP 3824557A1 EP 19759279 A EP19759279 A EP 19759279A EP 3824557 A1 EP3824557 A1 EP 3824557A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- impedance
- frequency
- primary
- output
- 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- Withdrawn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
-
- 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
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
- H03F1/565—Modifications of input or output impedances, not otherwise provided for using inductive elements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/26—Push-pull amplifiers; Phase-splitters therefor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H1/0007—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of radio frequency interference filters
-
- 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
-
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/541—Transformer coupled at the output of an amplifier
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H2001/0021—Constructional details
- H03H2001/0078—Constructional details comprising spiral inductor on a substrate
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H2001/0092—Inductor filters, i.e. inductors whose parasitic capacitance is of relevance to consider it as filter
-
- 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
- H03H2007/013—Notch or bandstop filters
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 impedance (for example variable around a value of 1W) with the aid of a higher-resistance transmission path (for example 50W).
- a first matching network with a (for example fixed) first impedance ratio is usually used between source and transmission path, and a second matching network with a (for example variable) second impedance ratio between 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 with essentially non-real high-frequency impedances and with 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.
- a point on the primary side with a symmetrical planar transformer results in a high-frequency point at the center of the primary winding, via which a supply voltage can be supplied, with only low demands on the blocking of the output signal against the voltage Care.
- 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.
- 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 primary and secondary coils, with capacitors form a resonant circuit between turns of a coil with inductances of the coil. This has a selection of a resonance frequency of the resonant circuit, the resonance frequency falling on a frequency of a harmonic harmonic of an input signal to be suppressed.
- a "planar transformer” is a special type of transformer that is characterized by a flat design.
- 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 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. This means that 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 (which is reflected on the output of the planar transformer):
- the planar transformer is non-transparent for these harmonics, the harmonic termination on the input side depends on the state of the load and the second adjustment network independently.
- 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 a 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” synonymous with “planes”, “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.
- a further embodiment of the planar transformer for carrying out the method according to the invention can take place 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.
- Another embodiment of a planar transformer which embodiment is advantageously suitable for implementing the method according to the invention, has more than one primary coil.
- a 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.
- planar transformer which embodiment is advantageously suitable for implementing the method according to the invention, has more than one secondary coil.
- 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 is used as an illustrative example. ben, planes essentially parallel to each other, extends; in a row of successive levels perpendicular to the levels referred to as first level S 1, second level PI, 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 of all primary coils are electrically shorted together.
- a first secondary coil consists of a first partial coil T1 with a first number of turns of a first winding sense in the first level S1 and a fourth partial coil T4 of the first number of turns of the first opposite winding sense 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
- the method according to the invention can provide 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.
- a method 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 can be provided.
- the second coil is constructed symmetrically and has a point of symmetry and a differential output with two branches.
- This second coil between the point of symmetry and a first branch of the differential output has a distributed inductance and a distributed capacitance between its turns and can furthermore comprise the feature that a resonance frequency between the distributed inductance and distributed capacitance is selected equal to a multiple of a preferred operating frequency.
- the task can also be solved by a method for operating a planar transformer, which has a preferred operating frequency and consists of a primary and a secondary side.
- the primary side has an input with a first input impedance at the preferred operating frequency and the 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.
- the first source impedance is complexly conjugated to the first load impedance of the input impedance.
- the first load impedance is complex conjugate to the first source impedance of the output impedance when the input is terminated.
- the primary side has at least one first coil and that secondary side has at least one second coil, which second coil is constructed symmetrically.
- a virtual high-frequency mass is thus shown at the point of symmetry, which comprises selecting a resonance frequency between distributed inductance and distributed capacitance equal to a multiple of a preferred operating frequency.
- the planar transformers according to the invention with the method according to the invention can be operated in high-frequency operation. While this change in the never- the frequency range between two real impedances in relation to the square of the winding ratio, the relationship is more complicated with essentially non-real high-frequency impedances and with essentially distributed capacitance and inductance coatings in the higher-frequency range.
- the high-frequency operation can be f> 10 MHz. Furthermore, the high-frequency operation can be 50 kHz ⁇ f ⁇ 10 MHz.
- An embodiment of the device according to the invention can comprise a planar transformer, comprising at least one primary and one secondary side, which can be operated as input or output side, and comprise a controller, the controller having programming that follows the steps one of the above process steps.
- Another embodiment of 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 having at least one second coil, the second coil being constructed symmetrically and one Point of symmetry and 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 between its turns, characterized in that a resonance frequency between the distributed inductance and distributed capacitance is a multiple of the preferred operating frequency.
- the device according to the invention can further 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, the preferred one Operating frequency, the first source impedance at the end of the output is complex conjugated with the first load impedance of the input impedance, and the first load impedance at the end of the input is complex conjugated with the first source impedance of the output impedance, with that primary side having at least one first coil and that secondary side being at least has a second coil, which second coil is constructed symmetrically and, when the planar transformer is operated differentially, has a virtual high-frequency mass at the point of symmetry, which is characterized in that a resonance frequency between distributed inductance and distributed capacitance is a multiple of the preferred operating frequency.
- the device according to the invention and the method according to the invention can also be combined with further, optional advantageous features.
- the above-mentioned methods, devices and their embodiments to ensure efficiency relate to the use of the capacities within a coil (e.g. the secondary coil / s). Further embodiments can combine the use of these and the use of capacities between primary and secondary coils in order to achieve increased efficiency.
- the inductance coating along the coils forms, together with the capacitance coating between the primary and secondary coils, a strip line with a given line impedance and a given electrical line length.
- the electrical line length in turn depends on the geometric length of the line and the speed of propagation of the signal in the dielectric.
- a virtual RF mass is mapped to a first impedance at the point of symmetry of the secondary coil.
- Will be the electrical length of the route From the point of symmetry along the secondary coil to the output of the secondary coil is equal to an odd (even) multiple of a quarter of the wavelength of a desired harmonic, the transmission of a signal from the output to the input of the fully symmetrical planar transformer is maximally low-loss if this output is idle (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.
- 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-resistance 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 a 1 ohm load impedance is absolutely necessary here ,
- an adaptation network 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, each with impedances that are unfavorably high for the operation of the source or the adaptation of the load, but disadvantageous when terminating with the existing load and source impedances high losses.
- 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.
- the advantage the inductance coating decreases (two coils in parallel), the capacitance coating increases, the line impedance as the square root of the divided by the capacitance coating Inductance coating drops by half if there are two parallel secondary coils.
- the spaces between the first level S1 and the second level Pl, the second level Pl 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 are each filled with the same dielectric, a first distance 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 Pl as well as between - See the sixth level P3 and the seventh level S4 are selected.
- 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 therefore be combined with a method for operating an impedance variable load on a device, consisting of a planar transformer, consisting of at least one primary and one secondary side, which can be operated as an input or output side, comprising a virtual image RF mass at the point of symmetry of one of the secondary sides to a first impedance.
- the above combined method may further select a route to a point of symmetry along one of the secondary sides to exit 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).
- Another possible combination is the addition of 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 point of symmetry and one differential output having two branches, which 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 a selection of a resonance frequency between distributed inductance and distributed capacitance, which is the same is a multiple of a preferred operating frequency.
- the method according to the invention can be carried out with a method 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 one when the planar transformer is operated differentially has virtual high-frequency mass at the point of symmetry, 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 integral fraction of half the wavelength at the preferred operating frequency.
- the method according to the invention can include 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, 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 are 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 high-frequency mass at the point of symmetry when the planar transformer is operating differently, which selection comprises an electrical length of the secondary coil less than half the wavelength at the operating frequency and the same as an integral multiple of an integral fraction of half the wavelength at the operating frequency.
- An embodiment of a device which can use the above-mentioned methods to achieve the object according to the invention consists of 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 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 at least has a 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.
- 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 an integer multiple of an integer 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, 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 has 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 further embodiment of a device for applying the methods according to the invention is 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 an output with a has first output impedance at the preferred operating frequency.
- the 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 via the devices can furthermore have a controller, the controller having programming which has the steps according to one of the preceding claims.
- 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 for illustration purposes is parallel to that is arranged first level, which can be the secondary side.
- the planar transformer in Figure 1 has more than just a secondary coil.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Coils Or Transformers For Communication (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE102018005738 | 2018-07-22 | ||
DE102018009166.0A DE102018009166A1 (en) | 2018-07-22 | 2018-11-22 | DEVICE AND METHOD FOR OPERATING AN IMPEDANCE VARIABLE LOAD ON THE PLANAR TRANSFORMER IN HIGH FREQUENCY OPERATION II |
PCT/DE2019/000191 WO2020020393A1 (en) | 2018-07-22 | 2019-07-22 | Apparatus and method for operating a variable-impedance load on the planar transformer in high-frequency mode ii |
Publications (1)
Publication Number | Publication Date |
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EP3824557A1 true EP3824557A1 (en) | 2021-05-26 |
Family
ID=69147874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19759279.3A Withdrawn EP3824557A1 (en) | 2018-07-22 | 2019-07-22 | Apparatus and method for operating a variable-impedance load on the planar transformer in high-frequency mode ii |
Country Status (6)
Country | Link |
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US (1) | US20200294707A1 (en) |
EP (1) | EP3824557A1 (en) |
JP (1) | JP2021531638A (en) |
CN (1) | CN112425080A (en) |
DE (1) | DE102018009166A1 (en) |
WO (1) | WO2020020393A1 (en) |
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US11368193B2 (en) * | 2020-02-04 | 2022-06-21 | Nxp B.V. | Near-field electromagnetic induction (NFEMI) antenna |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US4816784A (en) * | 1988-01-19 | 1989-03-28 | Northern Telecom Limited | Balanced planar transformers |
DE102006022845B4 (en) * | 2005-05-23 | 2016-01-07 | Infineon Technologies Ag | A drive circuit for a switch unit of a clocked power supply circuit and resonance converter |
CN206976152U (en) * | 2017-07-28 | 2018-02-06 | 中国振华(集团)新云电子元器件有限责任公司 | A kind of E magnetic cores parallel combination type flat surface transformer |
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2018
- 2018-11-22 DE DE102018009166.0A patent/DE102018009166A1/en not_active Withdrawn
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2019
- 2019-07-22 EP EP19759279.3A patent/EP3824557A1/en not_active Withdrawn
- 2019-07-22 US US16/753,166 patent/US20200294707A1/en not_active Abandoned
- 2019-07-22 JP JP2020528459A patent/JP2021531638A/en active Pending
- 2019-07-22 CN CN201980007050.3A patent/CN112425080A/en active Pending
- 2019-07-22 WO PCT/DE2019/000191 patent/WO2020020393A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
JP2021531638A (en) | 2021-11-18 |
US20200294707A1 (en) | 2020-09-17 |
WO2020020393A1 (en) | 2020-01-30 |
CN112425080A (en) | 2021-02-26 |
DE102018009166A1 (en) | 2020-01-23 |
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