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WO2004021566A1 - Circuit de filtrage pour reseaux - Google Patents

Circuit de filtrage pour reseaux Download PDF

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Publication number
WO2004021566A1
WO2004021566A1 PCT/DE2003/002892 DE0302892W WO2004021566A1 WO 2004021566 A1 WO2004021566 A1 WO 2004021566A1 DE 0302892 W DE0302892 W DE 0302892W WO 2004021566 A1 WO2004021566 A1 WO 2004021566A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductor
filter circuit
phase
bushing
housing
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.)
Ceased
Application number
PCT/DE2003/002892
Other languages
German (de)
English (en)
Inventor
Peter Schweiberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Electronics AG
Original Assignee
Epcos AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Epcos AG filed Critical Epcos AG
Publication of WO2004021566A1 publication Critical patent/WO2004021566A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/35—Feed-through capacitors or anti-noise capacitors
    • 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
    • H03H7/42—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns
    • H03H7/425—Balance-balance networks
    • H03H7/427—Common-mode filters
    • 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
    • H03H2001/0042—Wound, ring or feed-through type capacitor
    • 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
    • H03H7/0107—Non-linear 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
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1758—Series LC in shunt or branch path

Definitions

  • the invention relates to a filter circuit for networks, which contains a phase and a feed-through component.
  • Multi-phase power lines generally have multiple phase lines and a zero line.
  • an interference filter in the form of a bushing component is used for each line.
  • filter circuits of the type mentioned at the outset are known, with which the object is achieved to create a modular line filter with a modular principle and with a low leakage current.
  • a feed-through capacitor housing is provided, a feed-through capacitor being connected to a metallic corrugated hose.
  • the filter housing is divided into high-frequency-tight chambers by partitions.
  • a plurality of feedthrough capacitors are contained in the feedthrough capacitor housing. The feed-through capacitors for all phases are combined in a single capacitor housing as a mains line filter for a 3-phase system.
  • the known filter circuit has the disadvantage that a large mechanical effort is required to construct the feedthrough capacitor, which is due, on the one hand, to the fact that a large number of capacitors, namely the capacitors for all three phases, have to be integrated in a single high-frequency-tight housing. On the other hand, the high mechanical effort results from the need to attach a metallic corrugated hose.
  • a feed-through component can be used which can be used in a line filter and which has a feed-through for one phase and a further feed-through for a has a central conductor.
  • This component is designed for a power supply with only one phase and a neutral conductor and is not suitable for use in multi-phase power supply systems for reasons of cost.
  • a filter circuit is specified for a network that has a phase.
  • the filter circuit has a bushing component that contains a housing.
  • a series connection of two capacitors is contained in the housing.
  • a conductor is also contained in the housing and is led out of the housing from the center tap of the series connection.
  • the phase of the network is connected to an earth via the series connection.
  • the conductor to be preferably connected to the zero line of the corresponding power supply system is - in contrast to a z. B. known from the publication DE 2456088 A, designed as a feed-through center conductor - designed as a stub which emerges from the housing at only one point on the housing.
  • the inventive design of the conductor in the form of a stub line has the advantage over a center conductor designed as a bushing that it can be produced inexpensively and can be used universally in single-phase and multi-phase power lines with any number of phases.
  • an interference filter according to the invention (feed-through component) sets, the stub lines of the interference filters being electrically connected to one another and preferably also to a zero line.
  • the feedthrough filter according to the invention has attenuation values up to the GHz range. This makes it stand out from the usual EMC circuits.
  • the filter circuit according to the invention has the advantage that a multiplicity of functionalities can be achieved by simple wiring, via the conductor which is led out of the housing of the bushing component.
  • the conductor can be connected to a neutral conductor of the network.
  • a crossover can be realized by constructing the series connection from two capacitors and the center tap.
  • the housing can be connected to an earth, for example.
  • the occurrence of high reactive currents in the housing, which are generally generated by the useful frequency, which is, for example, in the range of 50 Hz, can be reduced by deriving these frequencies through the conductor.
  • a network which is a three-phase network and which is a symmetrical network. In this case, no neutral conductor is required and a lead-through component is provided for each phase, one conductor being provided for each phase. Each phase is conductively connected to earth via a series connection of two capacitors. The conductors can be connected to a virtual neutral conductor. This virtual zero conductor is at the potential zero in the event that the three-phase system is symmetrical. In all other cases, the potential of the virtual zero conductor can be different from zero.
  • each feedthrough device is connected between the phase and an earth.
  • the bushing components are connected in a parallel connection.
  • a network which has a multiplicity of phases.
  • Three of the phases each form a three-phase system.
  • the bushing components belonging to a three-phase system can again be connected to a common virtual neutral conductor with regard to their conductors.
  • Such multi-phase systems can be used, for example, to control motors which have different speeds depending on the phases connected.
  • the conductors belonging to different phases of lead-through components are connected to a monitoring device.
  • a monitoring device can be used, for example, to monitor the symmetry conditions in three-phase, symmetrical systems. If the symmetry condition is met, the voltages present in the three phases compensate for the value zero. In the event of asymmetries, which occur, for example, in the event of faults in the load, the three phases no longer compensate for zero and with the aid of a monitoring device, the occurrence of a current or a voltage can be detected on the virtual neutral conductor and thus the Fault in the load can be detected.
  • a feedthrough component is provided for each phase in a multi-phase system.
  • Each conductor of each lead-through component is connected to a device for signal coupling.
  • high-frequency signals can be coupled into a power network.
  • each bushing component is connected to a device for signal coupling in a multi-phase system.
  • high-frequency signals can be extracted from a power grid and processed further afterwards.
  • the conductors of the bushing components are interconnected in a three-phase system and connected to a grounded inductor. This allows the frequency selectivity of the filter circuit to be increased by building a parallel resonant circuit.
  • each conductor in a multi-phase system can be connected to an inductance connected to ground.
  • the filter circuit can be equipped with improved frequency selectivity.
  • the described design of the filter circuit makes it possible to produce an improved modularity, since the bushing components required for each phase can be designed and assembled as separate components simply and without high mechanical outlay. In particular, it is not necessary to integrate all filter components in a single housing in a multi-phase system.
  • a feedthrough component is also specified which is provided with a housing. Furthermore, the component is provided with a bushing which is guided through the housing.
  • the bushing is electrically conductive and preferably enters the housing at one point on the housing and exits the housing at the point on the housing opposite the entry point.
  • the bushing runs straight through the housing.
  • a series connection of two capacitors is also provided.
  • the series connection is connected between the bushing and the housing of the component.
  • a conductor, which is led out of the housing, is contacted at the center tap of the series connection.
  • the feedthrough component has the advantage that a crossover can be implemented by the described construction of the series circuit comprising two capacitors and the center tap.
  • a suitable choice of the capacitances of the two capacitors enables frequencies which are in the range of the useful frequency to be derived via the center tap of the series circuit, while frequencies which are in the range of the interference frequencies can be derived to the housing via both capacitors.
  • the occurrence of high reactive currents in the housing which can generally be generated by the useful frequency, which is, for example, in the range of 50 Hz by reducing these frequencies by the conductor.
  • a filter circuit is specified with a component of the type just described, the feedthrough being connected to a phase, the conductor to a neutral conductor and the housing to an earth.
  • the implementation is thus connected to the phase, while the conductor, which is intended to derive the signals lying above the first capacitor, is at the potential of the neutral conductor
  • the reactive current which is mainly caused by the useful frequencies, can therefore be dissipated via the neutral conductor, thereby reducing the load on the grounding.
  • the component described can be used very universally, both in single-phase and - then in a corresponding number - multi-phase filters. This reduces the number of parts in the manufacture of EMC filters.
  • the capacitance of the capacitor which is connected directly to the housing is smaller than the capacitance of the capacitor which is connected directly to the bushing. This enables the low-frequency useful currents to be derived via the center tap, while high-frequency interference can be derived via the housing of the bushing component.
  • the capacitors are capacitors, the windings of which are arranged around the bushing.
  • two winding capacitors can be arranged concentrically to one another.
  • two winding capacitors can also be arranged next to one another on the bushing.
  • the component contains one or more inductors which are connected to the capacitors in the component.
  • an inductor can be connected in series for implementation.
  • a component which comprises a further series connection of two capacitors, which is connected between the feedthrough and the housing, and in which an inductance is connected between the connection points of the series connections with the feedthrough, and in which between the center taps of the series connections another inductor is connected.
  • An inductance can advantageously be formed by an annular core arranged around the bushing and, if appropriate, around the conductor. Such a construction has the advantage that little space is required for the inductance.
  • a screen wall for a screened volume is also specified, to which a component of the type described above is fastened by screwing the housing to the wall on the screened side of the wall.
  • a component of the type described above is fastened by screwing the housing to the wall on the screened side of the wall.
  • magneto-resonance rooms magnetic resonance tomography
  • Rooms electricity for lighting and for sockets must be led through the screen wall.
  • Each phase can be protected against high-frequency interference by a described lead-through component.
  • the bushing component When used in filter circuits or devices, the bushing component can also be operated in parallel to increase the current carrying capacity.
  • one or more bushing components can be used for each phase connection. This creates a modular structure that reduces the number of parts and increases the flexibility when using the components.
  • the mechanical design of the bushing component can be designed so that it is compatible with known bushing components according to the prior art described above. This makes it possible to retrofit devices to the bushing component described here without any additional effort.
  • Figure 1 shows a filter circuit in a schematic circuit diagram.
  • FIG. 2 shows a filter circuit in a low leakage current circuit in a schematic circuit diagram.
  • FIG. 3 shows a filter circuit in a three-phase network in a schematic circuit diagram.
  • Figure 4 shows a filter circuit with a multi-stage structure.
  • Figure 5 shows a filter with a multi-stage structure for a three-phase network.
  • FIG. 6 shows a filter circuit for a three-phase system without a neutral conductor.
  • FIG. 7 shows a filter circuit for a multi-phase system for operating an engine.
  • FIG. 8 shows a filter circuit for a multiphase system with an additional monitoring device.
  • FIG. 9 shows a filter circuit for a multiphase system with an additional inductance.
  • FIG. 10 shows a filter circuit for a multiphase system with three additional inductors.
  • FIG. 11 shows a filter circuit for a multi-phase system with an additional signal coupling.
  • FIG. 12 shows a filter circuit for a multiphase system with an additional signal decoupling.
  • Figure 13 shows a bushing component partly in a longitudinal section, partly in a plan view.
  • FIG. 14 shows an equivalent circuit diagram for a component according to FIG. 13.
  • FIG. 15 shows a lead-through component, partly in a longitudinal section, partly in a plan view.
  • FIG. 16 shows an equivalent circuit diagram for a component according to FIG. 15.
  • FIG. 17 shows an equivalent circuit diagram for a bushing component which is designed as a 7T filter.
  • FIG. 18 shows a filter circuit with two lead-through components.
  • Figure 19 shows an arrangement of bushing components for use in shielded rooms.
  • FIG. 20 shows an equivalent circuit diagram for the arrangement of bushing components according to FIG. 19.
  • FIG. 1 shows a filter circuit for a network with a phase PL and with a neutral conductor N.
  • a feed-through component 8 is provided which has a series circuit 3 of two capacitors C1, C2.
  • the phase PL is connected to an earth via the series circuit 3.
  • the series circuit 3 is installed in a housing 1.
  • a conductor 4 runs out of the housing 1 from the center tap of the series circuit 3, which is arranged between the two capacitors C1, C2.
  • the conductor 4 is connected to the neutral conductor N.
  • a further feed-through capacitor 112 constructed in a manner known per se — is arranged on the neutral conductor N.
  • conductor 4 is designed as a stub line, see FIG. 15.
  • FIG. 2 shows a filter circuit with lead-through components 8, 9 corresponding to FIG. 1.
  • the filter circuit comprises two phases PL1, PL2, as are used, for example, for feeding or feeding electrical energy into a converter or into an emergency power generator.
  • Zero conductors N1, N2 belonging to the phases PL1, PL2 are also provided.
  • Each phase PL1, PL2 is equipped with a feed-through component ment 8, 9 connected.
  • a separate housing 1 is provided for each lead-through component 8, 9, which advantageously improves the assembly and the mechanical outlay.
  • Each bushing component 8, 9 is provided with a conductor 408, 409, which connects the center tap of the bushing component 8, 9 with the associated neutral conductor N1, N2.
  • FIG. 3 shows a filter circuit corresponding to Figure 1, with the difference that it is intended for a three-phase system.
  • a network is provided with three phases PL1, PL2, PL3 and also with a neutral conductor N.
  • each bushing component 8 , 9, 11 is assigned to a phase PL1, PL2, PL3.
  • Each bushing component 8, 9, 11 connects the corresponding phase PL1, PL2, PL3 to an earth.
  • each bushing component 8, 9, 11 comprises a conductor 408, 409, 411, which are all connected together to the neutral conductor N.
  • FIG. 4 shows a filter circuit with a multi-stage structure, the inductances and capacitances shown in the middle of FIG. 4 being designed for the low-frequency range of the filter.
  • Bushing components 8, 9 are arranged on the left and right ends of the filter circuit, which are intended for filtering in the high-frequency region of the filter circuit.
  • Varistors V are also provided, which are used to derive overvoltages.
  • the input side is provided on the left side of the filter circuit and the shielded side is provided on the right side of the filter circuit.
  • a phase PL and a neutral conductor N are provided.
  • the interconnection components 8, 9, which are each arranged in a separate housing 1, together with their conductors 408, 409, are connected in the manner corresponding to FIGS. 1 to 3.
  • FIG. 5 shows a filter circuit corresponding to FIG. 4, but instead of one phase PL three phases PL1, PL2, PL3 are provided.
  • a separate pair of bushing components 8, 9; 11, 12; 13, 14 and correspondingly a conductor 408, 409, 411, 412, 413, 414 is provided for this purpose.
  • the interconnection of the lead-through components 8, 9, 11, 12, 13, 14 is carried out in an analogous manner in FIG.
  • FIG. 5 shows in particular how a large number of feed-through components 8, 9, 11, 12, 13, 14 can be used in many different locations within the filter circuit, each in its own housing.
  • the filter circuit also has the advantage that the bushing components 8, 9, 11, 12, 13, 14 can be identical to one another, which means that a large number of wiring options can be implemented with a relatively small number of design variations.
  • FIG. 6 shows a filter circuit for a three-phase system.
  • Three phases PL1, PL2, PL3 are provided.
  • a feed-through component 8, 9, 11 is provided for each phase PL1, PL2, PL3.
  • Each phase PL1, PL2, PL3 is connected to an earth via a corresponding feed-through component 8, 9, 11.
  • the filter circuit according to FIG. 6 has the special feature that it is a three-phase system without a neutral conductor, that is to say a symmetrical network. Accordingly, the neutral conductor is missing. Nevertheless, the low leakage current connection can be implemented. This is achieved by combining the conductors 408, 409, 411 and connecting them to a virtual neutral conductor VN1.
  • the virtual zero conductor VN1 is located at a symmetrical one
  • FIG. 7 shows a filter circuit corresponding to FIG. 6, but a multi-phase system is provided.
  • There are the phases PL1, PL2, PL3, PL4, PL5, PL6 are provided. These phases PL1, PL2, PL3, PL4, PL5, PL6 are used to supply a motor M with current.
  • the motor has the connections lu, Iv, lw, 2u, 2v, 2w. Each connection lu, Iv, lw, 2u, 2v, 2w of the motor M is connected to exactly one phase PL1, PL2, PL3, PL4, PL5, PL6.
  • a feed-through component 8 9, 11, 12, 13, 14 is provided for each phase PL1, PL2, PL3, PL4, PL5, PL6, which feeds through the corresponding phase PL1, PL2, PL3, PL4, PL5, PL6 connects the respective series connection of capacitors to an earth.
  • Figure 8 shows a filter circuit with a three-phase system.
  • Three phases PL1, PL2, PL3 are provided.
  • the three phases PL1, PL2, PL3 are connected to the three motor connections lu, lv, lw of a motor M.
  • FIG. 6 it is a three-phase system which is designed symmetrically and which has no neutral conductor.
  • three bushing components 8, 9, 11 are provided, which, in a manner corresponding to FIG. their conductors 408, 409, 411 are connected.
  • the status of the network and thus a possibly occurring fault of the motor M can be detected in FIG. 8 by connecting a monitoring device 100.
  • the monitoring device 100 can consist, for example, of a resistor R and an amplifier 113. The current flowing through the resistor R leads to a voltage drop, which is amplified by the amplifier 113 and can then be fed to the readout unit.
  • FIG. 9 shows a three-phase system, which corresponds to FIG. 6.
  • the conductors 408, 409, 411 are led to a common star point, which is connected to an inductor L1.
  • the inductor L1 in turn is connected to an earth.
  • FIG. 10 shows yet another embodiment similar to FIG. 9, whereby, in contrast to FIG. 9, each individual conductor 408, 409, 411 is connected to its own inductor L1, L2, L3.
  • FIG. 11 shows a filter circuit for a multiphase system, a device 110 for coupling signals being additionally provided.
  • Each conductor 408, 409, 411 is connected to the device 110 for coupling signals via a common line.
  • a filter circuit according to FIG. 11 enables data, for example Internet data, to be fed into a conventional network.
  • the signal direction is represented by the arrow on the left side of the device 110 for coupling signals.
  • FIG. 12 shows a modification of FIG. 11 in that a device 111 for coupling out signals is provided instead of the device for coupling in signals.
  • Each conductor 408, 409, 411 of the lead-through components 8, 9, 11, which are each assigned to a phase PL1, PL2, PL3, are each because separately connected to the device 111 for decoupling signals.
  • the filter circuits according to FIG. 11 and FIG. 12 work together, which ensures that signals coupled into the network according to FIG. 11 can be decoupled from the network and detected again by a filter circuit according to FIG.
  • a combination of the filter circuits according to FIGS. 11 and 12 can advantageously be used to use conventional power networks for data transmission.
  • FIG. 13 shows a bushing component in which a housing 1 is arranged rotationally symmetrically around a bushing 2.
  • the bushing 2 has the form of a solid metallic bolt, which is provided with a thread in places. Threaded portions of the bolt 2 are provided with nuts 16. With the help of these nuts 16, the component can be connected in a filter assembly.
  • the housing 1 is made of metal, for example brass, copper or steel, preferably aluminum, and is used for high-frequency shielding of the component from the outside. Furthermore, the housing 1 is sealed inwardly at a narrow point of the housing 1 with a seal 15a against moisture, which can be, for example, a casting compound or a PU adhesive.
  • the housing 1 has the shape of a pot which is open to the left, the left open side being sealed by a casting compound
  • the housing 1 is provided in a tapered section with a thread onto which a nut 17 is screwed.
  • the bushing component can be mounted in a filter assembly by means of the nut 17.
  • the housing 1 is sealed against moisture and other climatic influences.
  • Two capacitors C1 and C2 are arranged inside the housing 1. These are wound capacitors which are arranged concentrically with one another and for the passage 2.
  • the capacitors C1, C2 are connected to one another in an electrically conductive manner via a connecting element 18, which can be a metal sheet, for example.
  • the capacitor C1 is also connected to the bushing 2 in an electrically conductive manner.
  • the capacitor C2 is electrically conductively connected to the housing 1 on the opposite side.
  • a conductor 4 is connected to the center tap 51 between the two capacitors C1, C2, which is electrically conductive and which is led out of the housing 1 to the outside.
  • the external wiring of the bushing component is given by the left end of the bushing, connection AI and the right end of the bushing, connection A2.
  • connection B which is formed by the conductor 4 led out of the housing 1.
  • Another connection E is formed by the housing 1.
  • FIG. 13 With reference to the connections AI, A2, B, E in FIG. 13 and to the capacitors C1, C2 in FIG. 13, the equivalent circuit diagram for the component shown in FIG. 13 is shown in FIG.
  • the electrically conductive connection is shown, which is formed by the bushing 2 and which connects the connections AI, A2 to one another.
  • a first series circuit 3 of capacitors C1, C2 is also shown.
  • the series circuit 3 is at the connection point Pl with the
  • Implementation 2 electrically connected.
  • the series circuit 3 is connected to the terminal E on the side opposite P1.
  • the center tap 51 between the two capacitors C1, C2 is connected to the conductor 4, which forms the connection B outside the housing.
  • the two capacitors C1, C2 are electrically conductive to form a series connection. other connected.
  • the capacitor C1 With its capacitance of 4 ⁇ F, the capacitor C1 is suitable for forming a low impedance for the useful frequencies, which are, for example, 50 Hz. With its capacitance of 0.5 ⁇ F, capacitor C2 is suitable for forming a high impedance for the useful frequency. At the same time, the capacitor C2 is kept at a low voltage potential by the terminal B, which is why the useful frequency is not derived to the terminal E but preferably to the terminal B. It can thereby be achieved that the connection E is loaded only to a very small extent with reactive currents which originate from the useful frequency.
  • the capacitor Cl or the series connection of the capacitors Cl and C2 is suitable for forming a very low impedance for an EMC (electromagnetic compatibility) interference signal in a frequency range of 1 MHz, since in the series connection of the capacitances the total capacitance of the very small capacity C2 is dominated.
  • EMC electromagnetic compatibility
  • FIG. 15 shows a feedthrough component in an analogous manner to FIG. 13, with the difference that a toroidal core 7 is arranged inside the housing 1 in order to form two inductors.
  • the toroidal core 7 is fixed by means of potting compound and sealed off from the outside.
  • the toroidal core 4 is preferably made of carbonyl iron and is preferably soft magnetic.
  • the ring core 7 forms inductances for all electrical conductors running inside the ring core 7. An inductance is thus formed by the bushing 2 in connection with the toroidal core 7. Furthermore, an inductance is formed by the conductor 4 in connection with the toroidal core 7.
  • FIG. 14 a series circuit diagram for the component shown in FIG. 3 is also shown in FIG.
  • the connections AI, A2 are connected to one another by the bushing 2.
  • a first inductor L1 is connected in series to bushing 2. This inductance L1 is formed by the bushing 2 together with the toroidal core 7 from FIG. 3.
  • a circuit of capacitors C1, C2 is shown, which is connected to the terminals AI, A2, B and E in a manner analogous to that shown in FIG.
  • an inductance L2 which is formed in series with the conductor 4.
  • the inductance L2 is connected between the center tap 51 between the capacitors C1, C2 and the terminal B.
  • the circuit shown in FIG. 16 realizes an LC filter circuit which has better damping than a circuit according to FIG. 14.
  • FIG. 17 Another embodiment of the feedthrough filter, this time only with regard to the circuit diagram, is shown in FIG. 17.
  • a connection of the connections AI, A2 is realized by a bushing 2.
  • Each of the series circuits 3, 6 is electrically conductively connected to the bushing 2 at a connection point P1 or P2.
  • An inductance L1 is connected in series with lead-through 2 to the connecting points P1, P2.
  • the inductor L1 can be designed, for example, as in the manner described in FIG. 15.
  • a further inductor L2 is provided, which is connected in series for the connection between the center taps 51, 52 of the series circuits 3, 6.
  • the inductive tat L2 can be carried out according to the manner shown in Figure 15 by passing the conductor 4 through an annular core 7.
  • connection points P1, P2 connections of the series circuits 3, 6 are each connected to connection E.
  • the center taps 51, 52 are connected to one another by means of the inductance L2, the center tap 51 being connected to the external connection B via the conductor 4.
  • Filter realized, which allows particularly good filter properties to suppress electromagnetic interference in filter circuits.
  • the useful frequency is in the range of 50 Hz, while the
  • Interference frequencies are in the range of> 1 MHz.
  • FIG. 18 shows a mains line filter that can be used to suppress mains lines.
  • the power line filter from FIG. 18 is characterized by high interference suppression.
  • the mains cable filter is provided with a phase PL1, which can be connected to the primary or the secondary side of the filter.
  • the filter is provided with a connection for a neutral conductor N.
  • the filter is provided with a connection for the earth.
  • a feed-through component 8, 9 is connected in series with the phase PL1 on the primary and on the secondary side, as a result of which an effective interference suppression of the PL1 can be achieved.
  • the conductor 4 made out of the bushing components 8, 9 is electrically conductively connected to the neutral conductor N.
  • the housing 1 of the bushing components 8, 9 is shielded by the filter connected, which in turn is connected to the earth.
  • the exemplary embodiment from FIG. 18 shows the use of the bushing component in a single-phase mains line filter with high blocking attenuation.
  • the high-frequency signals EMC interference
  • the low-frequency leakage currents are returned via conductor 4 to the electrical system or to the neutral conductor N.
  • FIG. 19 shows the use of lead-through components 11, 12, 13, 14 when introducing power supplies in magneto-resonance rooms, such as are used for example in magnetic resonance imaging.
  • a screen wall 10 is provided which is electrically conductive and which consists, for example, of aluminum.
  • the screen wall 10 is connected to an earth.
  • Four bushing components 11, 12, 13 and a bushing element 14, which can be constructed according to the example from FIG. 13, are screwed to the screen wall 10 by screwing with nuts 1711, 1712, 1713, 1714, which correspond to the nut 17 from FIG.
  • each bushing component forms a connection for a phase PL1, PL2, PL3 or for a neutral conductor N.
  • nuts 1611, 1612, 1613 and 1614 are provided, on which electrical contacts are made to the bushings of the bushing components can.
  • bushing components 11, 12, 13, 14 on the side opposite the input side are further nuts for producing
  • each lead-through component 11, 12, 13 is provided with conductors 411, 412, 413, which are combined to form a conductor 400 and which are connected to the lead-through component 14 by screwing by means of nuts and thus to the neutral conductor N. are.
  • the screen wall for a screened volume can also be used for screened devices.
  • FIG. 19 shows the use of the feedthrough component in a multi-phase system, whereby identical or similar feedthrough components can be used for each phase, as a result of which the variety of parts can be reduced.
  • a screen wall 10, as described in more detail in connection with FIG. 19, is also shown in the exemplary embodiments according to FIGS. 4, 5 and 18 as a dashed vertical line.
  • FIG. 20 shows an electrical circuit diagram which is realized by the structure shown in FIG. 19.
  • Phases PL1, PL2, PL3 are connected to one another by bushings.
  • series connections 311, 312, 313 of capacitors are shown, which on the one hand can derive high-frequency interference from an earth, and in which the low-frequency spaces can be returned to the neutral conductor N at a center tap.
  • the lowermost bushing component which corresponds to bushing component 14 in FIG. 19, has only a single capacitor 314, which is connected to the bushing and to earth.
  • the present invention is not limited to filter circuits for EMC interference in the range of 1 GHz, but can be used for all types of interference in which a low-frequency useful frequency and a high-frequency interference frequency or a low-frequency interference frequency and a high-frequency useful frequency are to be separated from one another , Reference character list

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Filters And Equalizers (AREA)

Abstract

L'invention concerne un circuit de filtrage pour réseaux pourvu d'un composant de traversée (8, 9, 11, 12, 13, 14) comprenant un boîtier (1), dans lequel deux condensateurs (C1, C2) sont montés en série, ainsi qu'un conducteur (4, 408, 409, 411, 412, 413, 414) sortant du boîtier (1) par la prise médiane du montage en série, une phase (PL1, PL2, PL3, PL4, PL5, PL6) étant en connexion conductrice avec une terre par l'intermédiaire dudit montage en série.
PCT/DE2003/002892 2002-08-30 2003-09-01 Circuit de filtrage pour reseaux Ceased WO2004021566A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10240082.2 2002-08-30
DE2002140082 DE10240082A1 (de) 2002-08-30 2002-08-30 Filterschaltung für Netze

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WO2004021566A1 true WO2004021566A1 (fr) 2004-03-11

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PCT/DE2003/002892 Ceased WO2004021566A1 (fr) 2002-08-30 2003-09-01 Circuit de filtrage pour reseaux

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WO (1) WO2004021566A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006045834A1 (fr) * 2004-10-28 2006-05-04 Schaffner Emv Ag Noyau electromagnetique

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
DE975432C (de) * 1938-08-20 1961-11-30 Siemens Ag Entstoerungseinrichtungen fuer Mehrfachleitungen
JPS6177409A (ja) * 1984-09-21 1986-04-21 Sharp Corp ノイズフイルタ
US5142430A (en) * 1990-03-28 1992-08-25 Anthony Anthony A Power line filter and surge protection circuit components and circuits
DE10034054A1 (de) * 2000-07-13 2002-04-04 Epcos Ag Netzfilter

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
A P HALE, S ADAMS: "Thoughts on Power Line Filters, Particularly with Reference to Earth Leakage Currents", PROCEEDINGS OF 1ST SYMPOSIUM AND TECHNICAL EXHIBITION ON ELECTROMAGNETIC COMPATIBILTY, MONTREUX, 20 May 1975 (1975-05-20) - 22 May 1975 (1975-05-22), Montreux, pages 62 - 65, XP008025853 *
EPCOS AG: "4-Line Filters for Installations and Systems", XP002266582 *
R R THOMPSON, M FLEXMORE: "High Performance Filters with Low Leakage Current for Protection of Computers and Many Other Types of Equipment", 3RD INTERNATIONAL CONFERENCE ON SOURCES AND EFFECTS OF POWER SYSTEMS DISTURBANCES, - 5 May 1982 (1982-05-05), pages 282 - 286, XP008025603 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006045834A1 (fr) * 2004-10-28 2006-05-04 Schaffner Emv Ag Noyau electromagnetique

Also Published As

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