DE102013220704A1 - DOUBLE USE OF A CONVERTER FOR THE CONDUCTIVE AND INDUCTIVE CHARGING OF AN ELECTRIC VEHICLE - Google Patents

Abstract

A circuit comprises a conductive terminal comprising one or more reactors and an inductive terminal comprising one or more capacitors. Furthermore, the circuit comprises a DC voltage connection, a converter circuit and a changeover switch. The power converter circuit is connected to the DC voltage terminal, wherein the switch is configured to switchably connect the power converter circuit to the conductive terminal or the inductive terminal. The power converter circuit is configured to form, together with the one or more reactors of the conductive terminal when the power converter circuit is coupled to the conductive terminal, a low-frequency range AC-DC converter or a low-frequency range DC-DC converter. Further, the power conversion circuit is configured to form, together with the one or more capacitors of the inductive terminal, when the power converter circuit is coupled to the inductive terminal, a high-frequency range AC-DC converter or a high-frequency range DC-AC converter.

Description

Embodiments of the present invention relate to a circuit with a converter circuit, and more particularly to a circuit for dual use of a converter for the conductive and inductive charging of an electric vehicle.

Electric vehicle chargers typically include inverter circuits that are configured to convert, for example, a single-phase or three-phase AC voltage to a DC voltage to charge the battery of the electric vehicle. Such inverters typically include one or more reactors and one or more switchable elements interconnected, for example, to an H4 bridge arrangement or to a B6 bridge arrangement. These chargers can also be referred to as conductive charging devices. As an alternative to this conductive charge by means of single-phase or three-phase AC voltage so-called inductive charging devices are also used more and more often. In this case, by means of an alternating magnetic field energy is inductive, d. H. so wireless, transmitted to the electric vehicle. To receive the inductive energy, the vehicle then has a so-called "high-frequency coupler" with an associated power electronics. If the charging by means of both technologies is to be made equally possible in an electric vehicle, the two power electronics are coupled in parallel to the direct voltage network (eg a 400 volt direct current network). The presence of inductive charge components as well as conductive charge components increases the overall number of components and thus both the weight and cost of an electric vehicle.

The object of the present invention is to provide a converter for the conductive and inductive charging of an electric vehicle with a reduced number of components.

The object is solved by the independent claim 1.

Embodiments of the present invention provide a circuit. The circuit comprises a conductive terminal comprising one or more reactors and an inductive terminal comprising one or more capacitors. Furthermore, the circuit comprises a DC voltage connection, a converter circuit and a changeover switch. The power converter circuit is connected to the DC voltage terminal, wherein the changeover switch is designed to switchably connect the power converter circuit to the conductive terminal or the inductive terminal. The power converter circuit is configured to provide, in conjunction with the one or more reactors of the conductive terminal, when the power converter circuit is coupled to the conductive terminal, an AC to DC converter for a low frequency range (eg, AC voltages in the range 50 Hz or 60 Hz ) or form a DC-AC converter for the low frequency range. Further, the power converter circuit is configured to provide, together with the one or more capacitors of the inductive terminal, when the power converter circuit is coupled to the inductive terminal, an AC to DC converter for a high frequency range (eg, 1 kHz to 150 kHz) or to form a DC-AC converter for the high frequency range.

The core of the present invention thus lies in recognizing that a converter circuit, for example, for a charger of an electric vehicle (control technology) can be modified so that this together with one or more chokes for both the conductive charge and for the inductive charge one or more capacitors can be used. For this purpose, then the power converter circuit is connected in a switchable manner with one of the two terminals (induction or AC) via a switch, while the power converter circuit on the other side fixed to the DC power, z. B. the battery is connected. The specific components for the conductive charge (with AC voltage) and the inductive charge (with a high-frequency magnetic field) are on the part of the power electronics to the terminals, so the conductive connection and the inductive connection, relocated, so that by switching using the switch directly the be switched on for the respective operating mode necessary components. In other words, this means that the full bridges present for the conductive charge (for example in the single-phase case H4 bridges, Heric or H5 or in the three-phase case B6 bridges, NPC or BSNPC) are used in such a way that they are in the conductive case as an active 4-quadrant actuator and in the inductive case as an active or passive rectifier of a high-frequency current or voltage signal. Such a circuit thus enables the reduction of costs and in particular of the weight-intensive components, namely the power electronics.

According to preferred embodiments, both the conductive connection, the inductive connection and the DC voltage connection are bipolar, so that then the switch for the power converter circuit bipolar Coupled to the conductive connection or the inductive connection.

According to further embodiments, the power converter circuit comprises a controller which controls the switchable elements thereof in response to the switch position such that the AC-DC voltage conversion or a DC-AC conversion is performed either in the high frequency range or the low frequency range.

According to further embodiments, the conductive connection can be made either single-phase or three-phase. Depending on this, then the power converter circuit comprises either two bridges, the z. B. are arranged to form an H4 bridge arrangement, or three bridges, the z. B. Coupled to a B6 bridge arrangement.

According to further embodiments, the inductive terminal comprises a high-frequency coupler, such. B. a coil. Preferably, the high-frequency coupler is operated in resonance, in which case the one or more capacitors are arranged in series and / or parallel to the high-frequency coupler in order to tune this to the corresponding resonant frequency.

Embodiments of the present invention will be explained with reference to the accompanying drawings. Show it:

1 a schematic block diagram of a circuit according to a first embodiment;

2 a schematic block diagram of a circuit with an H4 bridge arrangement as a power converter circuit according to another embodiment;

3 a schematic block diagram of another circuit with a B6 bridge circuit as a converter circuit according to an alternative embodiment.

Before embodiments of the present invention are explained in detail below with reference to the figures, it should be noted that identical or equivalent elements and figures are provided with the same reference numerals, so that the description of which can be applied to each other or interchangeable.

1 shows a circuit 10 with three power connections, namely the inductive connection 12 , the conductive connection 14 and the DC voltage connection 16 , Furthermore, the circuit has 10 a power converter circuit 18 on that directly to the DC voltage connection 16 connected is. In addition, the power converter circuit 18 in a switchable manner via a switch 20 with the two other connections 12 and 14 connected. The connections 12 and 14 are basically designed for alternating voltage and can therefore also be referred to as alternating voltage or alternating current connections. The circuit 20 is designed to be the power converter circuit 18 and thus the DC voltage connection 16 Depending on the operating mode, either electrically with the inductive connection 12 or the conductive connection 14 connect to. The inductive connection 12 further comprises one or more capacitors 13 while the AC power connection 14 one or more throttles 15 includes.

At the circuit 10 forms the power converter circuit 18 together with the capacitors 13 of the inductive terminal an AC-to-DC converter or vice versa a DC-AC converter for a high frequency range, (eg 1 kHz to 150 kHz), when the switch 20 the inductive connection 12 the converter circuit 18 coupled. This AC-to-DC converter or DC-AC converter constructed in this way is designed to operate on the inductive connection on the basis of an energy signal (high-frequency voltage signal with, for example, 1 kHz to 150 kHz) 12 a DC voltage at the DC voltage terminal 16 provide. In this case, the inductively received alternating signal, which originates for example from a magnetic field, by means of the capacitors 13 and the power converter circuit 18 rectified in cooperation.

Conversely, the power converter circuit forms 18 together with the one or more restrictors 15 of the conductive connection 14 an AC-to-DC converter or a DC-AC converter for a low frequency range, z. B. 50 or 60 Hz when the switch 20 the conductive connection 14 along with its one or more chokes, the power converter circuit 18 coupled. The thus formed AC-to-DC converter or the DC-AC converter is designed to be based on a on the conductive connection 14 applied AC voltage (eg from a 230 V network, so a low-frequency current signal with 50 or 60 Hz) a DC voltage in the DC voltage connection 16 provide. Here, the rectification of the AC voltage from the conductive connection 14 through the power converter circuit 18 along with the throttle 15 ,

In the above two modes described (switch positions of the switch 20 ) it was assumed that based on an alternating signal either at the inductive terminal 12 or the conductive connection 14 a DC voltage at the DC voltage terminal 16 provided. This principle is reversible in the same way, so that on the basis of a DC voltage at the DC voltage connection 16 either an electrical voltage at the conductive terminal 14 at the one switch position of the switch 20 is provided or vice versa, that on the basis of a DC voltage from the DC voltage terminal 16 an electrical voltage for inductive decoupling via the inductive connection 12 provided.

2 shows a circuit 10 ' with an inductive connection 12 ' , a conductive connection 14 ' and a DC voltage connection 16 ' , The DC voltage connection 16 ' is again in a switchable manner over the switch 20 ' with the inductive connection 12 ' or the conductive connection 14 ' coupled, being between the switch 20 ' and the DC voltage connection 16 ' the power converter circuit 18 ' is provided.

In this embodiment, both the DC voltage terminal 16 ' , the power converter circuit 18 ' that have two connections 12 ' and 14 ' as well as the switch 20 ' bipolar executed. The converter circuit 18 ' has a first potential lead 16a ' and a second potential guide 16b ' on which the two poles of the DC connection 16 ' form. The converter circuit 18 ' also has a further connection with a first pole 18a ' and a second pole 18b ' on, with the two-pole switch 20 ' are connected. The bipolar switch 20 ' couples the two poles 18a ' and 18b ' either to the two poles 12a ' and 12b ' of inductive connection 12 ' or to the two poles 14a ' and 14b ' of the conductive connection 14 , The inductive connection 12 ' here comprises a plurality of capacitors, namely the capacitors 13a ' and 13b ' , wherein the arrangement of the same after discussion of the conductive connection 14 ' will be received.

The conductive connection 14 ' is executed here in a single phase. Here, any alternating voltage between the two poles 14a ' and 14b ' abuts, wherein preferred, as based on the AC voltage network 22 is shown at the pole 14a ' the phase is applied and at the pole 14b ' the neutral. Analogous to the execution 1 indicates the conductive connection 14 ' Throttles for current smoothing on. In this embodiment, each pole 14a ' and 14b ' with a respective throttle 15a ' respectively. 15b ' coupled.

The arrangement of the capacitors 13a ' and 13b ' of inductive connection 12 ' depend on the way of the inductive coupling element 24 from. In the illustrated embodiment, the inductive coupling element is a so-called high-frequency coupler 24 (Secondary side), which may for example comprise a coil. The high-frequency coupling element 24 is between the first and second pole 12a ' and 12b ' arranged. The high frequency coupler 24 is designed to be a high frequency field 25 from a high frequency network 26 (Primary side) to receive, if this, for example, another high-frequency coupler of the high-frequency network 26 (immediately) is opposite. Depending on the frequency of the high frequency field 25 become the capacitors 13a ' and 13b ' arranged so that according to preferred embodiments of the high-frequency coupler 24 is operated in resonance. In the illustrated embodiment, this is the first capacitor 13a serially between the high frequency coupler 24 and the first pole 12a ' arranged while the second capacitor 13b ' parallel to the high frequency coupler 24 ie between the first pole 12a ' and the second pole 12b ' is arranged. It should be noted that the arrangement, in particular the dimensioning of the capacitors of the capacitors 13a ' and 13b ' can vary. Factors influencing the capacities 13a ' and 13b ' In particular, the inductance of the high-frequency coupler 24 and the frequency of the high frequency field 25 , Typically, the structure or arrangement of the capacitances 13a ' . 13b ' opposite to the inductance of the high-frequency coupler 24 analogous to the construction of the counterpart 26 , which is designed to convert the electrical energy into a magnetic alternating field and provide the environment without conduction. In other words, by compensating for stray inductances using the compensation capacitors, the efficiency can be increased. Background to this is that there is a perfect match between energy transmitter 26 and energy receiver 12 ' then adjusts when the resonant frequencies by the capacitances 13a ' . 13b ' , and the inductance 24 is determined to be as consistent as possible. Regarding the arrangement of the capacitors 13a ' and 13b ' This means that there are four different resonance possibilities in detail due to the series or parallel compensation on the primary and secondary side: series-serial, series-parallel, parallel-parallel or parallel-serial arrangements. It should be noted that the high-frequency coupler 24 preferably part of the inductive connection 12 ' is.

In the circuit shown here 10 ' with the single-phase conductive connection 14 ' the rectification of the AC voltage, z. B. 230 volts, by means of the converter circuit 18 ' , this one is designed as H4 bridge circuit. The H4 bridge circuit 18 ' includes two bridges 32 and 34 with two switchable elements each 32a and 32b respectively. 34a and 34b , The bridges 32 and 34 are between the two potential channels 16a ' and 16b ' arranged. The switchable elements 32a and 34a as well as the switchable elements 34a and 34b are each connected in series, with a center node 32m respectively. 34m between. The switchable elements 32a . 32b . 34a and 34b For example, transistors, such as. B. field effect transistors or bipolar transistors, via a controller (not shown), such. B. a logic) can be controlled. Optionally, each switchable element 32a . 32b . 34a and 34b Bypassed by a diode. The middle node 34m forms the first pole 18a ' , where the middle node 32m the second pole 18b ' the converter circuit 18 ' forms. Furthermore, the power converter circuit comprises 18 ' a DC link capacity 36 parallel to the bridges 32 and 34 between the two potential channels 16a ' and 16b ' is arranged and comprises one or more capacitors. About this DC link 36 can the DC voltage after rectification by means of the converter circuit 18 ' be tapped if either the circuit 10 ' with an alternating current network 22 or with an alternating electromagnetic field 26 is coupled. By means of the DC voltage, z. B. 400 V to 800 V or> 300 V (typical DC voltage after an RF / DC conversion) or generally> 10 V, at the DC voltage terminal 16 ' For example, a battery of an electric vehicle can be charged.

According to further embodiments, the circuit comprises 10 ' a DC-DC converter 38 , which is designed to be connected to the DC voltage connection 16 ' increase or decrease the applied voltage. Preferably, the DC voltage is lowered, ie, for example, to the clock battery voltage level (≥ 250 V), so that at the DC voltage output 38a of the DC-DC converter 38 a high voltage, such as. B. 400 to 800 V is applied to the optional battery 40 to load. In this respect, in the case of such a series / series compensation of the DC-DC converter 38 be formed by a so-called buck converter. It should be noted that the DC-DC converter 38 Optionally, a galvanic isolation between the DC input 16 ' and the DC output 38a can have.

According to further embodiments, the conductive connection 14 ' each pole 14a ' respectively. 14b ' two series reactors 15a ' and 17a ' respectively. 15b ' and 17b ' include, wherein a capacitor 21 for network filtering between the center node of the respective series circuits of the chokes 15a ' and 17a ' respectively. 15b ' and 17b ' is arranged.

3 shows another circuit 10 '' with a power converter circuit 18 '' , which on a first page the DC voltage connection 16 ' and on a second side by means of the switch 20 '' with the inductive connection 12 ' or a conductive connection 14 '' can be selectively connected. As already stated above, forms the power converter circuit 18 '' together with the components of the inductive connection 12 '' (Capacities 13a ' and 13b ' as well as high-frequency couplers 24 ) an AC to DC converter for the high frequency range (<140 kHz) to the environment 25 or an alternating electromagnetic field 26 Receive energy.

Alternatively to the coupling of the converter circuit 18 ' at the inductive connection 12 ' can the power converter circuit 18 '' also with the conductive connection 14 '' , which is made in the present embodiment, three-phase, are connected. This will be the two poles 18a '' and 18b ' the converter circuit 18 '' with two first phases 14a '' and 14b ' of the conductive connection 14 '' over the switch 20 '' coupled. The third phase 14c '' can be stuck with the power converter circuit 18 '' remain connected or be connected in parallel to one of the other branches in order to minimize losses. Analogous to the above embodiment, each phase connection comprises 14a '' . 14b ' and 14c '' a corresponding throttle 15a '' . 15b '' and 15c '' ,

To the three-phase AC voltage (see 22 ' ) to DC voltage and to the DC voltage connection 16 ' output, includes the power converter circuit 18 '' three half-bridges 32 . 34 and 44 , As part of 2 described, are the half bridges 32 and 34 over the middle node 32m and 34m with the switch 20 '' connected and thus with the contacts 14a ' and 14b ' connectable. The third half bridge 44 is, as well as the two other half bridges 32 and 34 of two switchable elements (see reference numeral 44a and 44b ) built up. The middle node 44m the half bridge 44 can directly with the third contact 14c '' or the throttle 15c '' stay connected. The converter circuit 18 '' So forms a so-called B6 bridge circuit, which is driven accordingly to three-phase current in DC ( 14 '' to 16 ' ) to transform. Switching between the inductive connection 12 ' and the conductive connection 14 '' continues to be done by means of the switch 20 '' who has the full bridges 32 and 34 either with the poles 12a ' and 12b ' of inductive connection 12 ' or with the poles 14a '' and 14b ' of the conductive connection 14 '' connects, with the third half-bridge 44 via the control of the converter circuit 18 '' is activated when the conductive connection 14 '' is activated and deactivated when the DC voltage connection 12 ' is activated.

According to further embodiments, the conductive connection 14 '' a neutral conductor 14d '' include that with a center point 36m ' of the DC link 36 ' with two capacities 36a ' and 36b ' connected is. Thus, the neutral conductor 14d '' galvanically isolated with the two DC voltage connections 18a '' and 18b ' the converter circuit 18 '' coupled. For completeness, it should be noted that the neutral conductor 14d '' typically opposite to each phase (cf. 14a '' . 14b ' and 14c '' ) has a potential difference of, for example 230 volts, wherein the neutral conductor is formed by the sum of the three phases (see 22 ' ).

According to further embodiments, the conductive connection 14 '' a line filter 48 include. This network filter 48 includes three capacities, with the first capacity 48a between the first phase 14a '' and the neutral conductor 14d '' coupled, the second capacity 48b between the phase 14b ' and the neutral conductor 14d '' and the third capacity 48c between the third phase 14c '' and the neutral conductor 14d '' , Typically, such a network filter 48 or the capacitors 48a . 48b and 48c of the network filter 48 via central node between two throttles (cf. 15a '' . 15b '' and 15c '' and reference numerals 17a '' . 17b '' and 17c '' ) to the three phases 14a '' . 14b ' and 14c '' coupled.

As in 2 explained, the DC voltage connection 18 '' with an additional DC-DC converter 38 for voltage conversion for the battery 40 be equipped.

Even if in the above embodiments, always of single-phase AC voltage or voltage, which at the terminal 14 ' respectively. 14 '' is present, it was pointed out that according to further embodiments, a split phase can be connected.

Referring to 2 and 3 it should be noted that the switch 20 ' respectively. 20 '' at the circuits 10 ' and 10 '' is designed as a double-throw switch, so to speak comprises two parallel switching paths, the poles 18a ' respectively. 18a '' and 18b ' respectively. 18b ' with the respective poles 12a ' respectively. 12a '' and 12b ' respectively. 12b ' or 14a ' respectively. 14a '' and 14b ' respectively. 14b ' electrically connect in a synchronous manner.

According to further embodiments, the power converter circuit 18 ' , which has been described above as an H4 bridge circuit, can also be designed as a Heric circuit or as an H5 circuit (single-phase case, 2 ). Furthermore, the power converter circuit 18 '' , which has been described above as a B6 bridge circuit, may also be formed by a 3-level topology (NPC circuit or a BSNPC circuit) (three-phase case, 3 ).

All of the aforementioned power converter circuits have in common that they can be realized using active semiconductor switches with a high efficiency. This applies in particular to the inductive energy transmission (active rectification), which has an increased efficiency in contrast to the use of passive rectifier diodes due to the synchronous rectification. By using the active switchable elements, it is also possible, not only, as described above, the power converter circuit 18 ' respectively. 18 '' for charging the battery by means of inductively transmitted energy (see inductive connection 12 ' respectively. 12 '' ) or by means of conductively transmitted energy (see conductive connection 14 ' respectively. 14 '' ) but also energy in one of the networks 22 . 22 ' or 26 feed back as to frame from 2 was operated.

The embodiments described above are merely illustrative of the principles of the present invention. It will be understood that modifications and variations of the arrangements and details described herein will be apparent to others of ordinary skill in the art. Therefore, it is intended that the invention be limited only by the scope of the appended claims and not by the specific details presented in the description and explanation of the embodiments herein.

Claims (25)

Circuit ( 10 . 10 ' . 10 '' ) having the following characteristics: a conductive connection ( 14 . 14 ' . 14 '' ), one or more throttles ( 15 . 15a ' . 15b ' . 15a '' . 15b '' . 15c '' ), an inductive terminal ( 12 . 12 ' . 12 '' ), one or more capacitors ( 13 . 13a ' . 13b ' ); a DC voltage connection ( 16 . 16 ' . 16 '' ); a converter circuit ( 18 . 18 ' . 18 '' ); and a switcher ( 20 . 20 ' . 20 '' ); the converter circuit ( 18 . 18 ' . 18 '' ) with the DC voltage connection ( 16 . 16 ' . 16 '' ), the switch ( 20 . 20 ' . 20 '' ) is formed to switchably the power converter circuit ( 18 . 18 ' . 18 '' ) with the conductive connection ( 14 . 14 ' . 14 '' ) or the inductive connection ( 12 . 12 ' . 12 '' ), the converter circuit ( 18 . 18 ' . 18 '' ) is configured to be coupled with the one or more chokes ( 15 . 15a ' . 15b ' . 15a '' . 15b '' . 15c '' ) of the conductive connection ( 14 . 14 ' . 14 '' ), if the power converter circuit ( 18 . 18 ' . 18 '' ) is coupled to the AC terminal to form an AC-to-DC converter for a low frequency range or a DC to AC voltage converter for the low frequency range, and wherein the power converter circuit ( 18 . 18 ' . 18 '' ) is configured to be connected to the one or more capacitors ( 13 . 13a ' . 13b ' ) of the inductive terminal ( 12 . 12 ' . 12 '' ), if the power converter circuit ( 18 . 18 ' . 18 '' ) with the inductive connection ( 12 . 12 ' . 12 '' ) is adapted to form an AC to DC converter for a high frequency range or a DC-AC converter for the high frequency range. Circuit ( 10 . 10 ' . 10 '' ) according to claim 1, wherein the low frequency range has a frequency range of 5 to 200 Hz and wherein the high frequency range has a frequency range of 1 to 150 kHz. Circuit ( 10 . 10 ' . 10 '' ) according to claim 1 or 2, wherein the conductive connection ( 14 . 14 ' . 14 '' ) comprises at least a first and a second pole, the inductive connection ( 12 . 12 ' . 12 '' ) comprises a first and second pole, the power converter circuit ( 18 . 18 ' . 18 '' ) comprises a first and second pole connected to the switch ( 20 . 20 ' . 20 '' ), and wherein the switch ( 20 . 20 ' . 20 '' ) is formed around the first pole of the power converter circuit ( 18 . 18 ' . 18 '' ) with the first pole of the inductive terminal ( 12 . 12 ' . 12 '' ) or the first pole of the conductive connection ( 14 . 14 ' . 14 '' ) and around the second pole of the converter circuit ( 18 . 18 ' . 18 '' ) with the second pole of the inductive terminal ( 12 . 12 ' . 12 '' ) or the second pole of the conductive connection ( 14 . 14 ' . 14 '' ) to couple. Circuit ( 10 . 10 ' . 10 '' ) according to claim 3, wherein the power converter circuit ( 18 . 18 ' . 18 '' ) a first and second voltage tap ( 16a ' . 16b ' ) connected to a first and second pole of the DC voltage terminal ( 16 . 16 ' . 16 '' ) connected is. Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 2 to 4, wherein the power converter circuit ( 18 . 18 ' . 18 '' ) comprises a controller which is designed to switchable elements of the converter circuit ( 18 . 18 ' . 18 '' ) such that depending on a position of the switch ( 20 . 20 ' . 20 '' ) in the high-frequency range or the low-frequency range, an AC-DC voltage conversion and / or a DC-AC voltage conversion is performed. Circuit ( 10 . 10 ' . 10 '' ) according to claim 4, wherein the power converter circuit ( 18 . 18 ' . 18 '' ) two bridges ( 32 . 34 ), each between the first and second voltage tap ( 16a ' . 16b ' ) and each have a center ( 32m . 34m ), the two midpoints ( 32m . 34m ) of the two bridges ( 32 . 34 ) form the first and second poles. Circuit ( 10 . 10 ' . 10 '' ) according to claim 6, wherein each bridge ( 32 . 34 ) two switchable elements ( 32a . 32b . 34a . 34b ), wherein a first of the two switchable elements ( 32a . 34a ) between the first voltage tap ( 16a ' ) and the center ( 32m . 34m ) and a second of the switchable elements ( 32b . 34b ) between the center ( 32m . 34m ) and the second voltage tap ( 16b ' ) is arranged. Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 3 to 7, wherein the first pole and the second pole of the conductive connection ( 14 . 14 ' . 14 '' ) each have a first throttle ( 15 . 15a ' . 15b ' . 15a '' . 15b '' . 15c '' ). Circuit ( 10 . 10 ' . 10 '' ) according to claim 8, wherein the first pole and the second pole of the conductive connection ( 14 . 14 ' . 14 '' ) each have a second throttle ( 17a ' . 17b ' . 17a '' . 17b '' . 17c '' ), wherein the first throttle ( 15 . 15a ' . 15b ' . 15a '' . 15b '' . 15c '' ) and the second throttle ( 17a ' . 17b ' . 17a '' . 17b '' . 17c '' ) of the first and the first throttle ( 15 . 15a ' . 15b ' . 15a '' . 15b '' . 15c '' ) and the second throttle ( 17a ' . 17b ' . 17a '' . 17b '' . 17c '' ) of the second pole are each arranged to form a series arrangement, so that each pole has a center node between the first and second reactor ( 15 . 15a ' . 15b ' . 15a '' . 15b '' . 15c '' . 17a ' . 17b ' . 17a '' . 17b '' . 17c '' ), wherein a capacitance between the center node of the first pole and the center node of the second pole is arranged. Circuit ( 10 . 10 ' . 10 '' ) according to claim 4, wherein the conductive connection ( 14 . 14 ' . 14 '' ) a three-phase conductive connection ( 14 . 14 ' . 14 '' ) and wherein the power converter circuit ( 18 . 18 ' . 18 '' ) three bridges ( 32 . 34 . 44 ), each between the first and second voltage tap ( 16a ' . 16b ' ) and each have a center ( 32m . 34m . 44m ), where two of the three midpoints ( 32m . 34m ) the first and second poles of the power converter circuit ( 18 . 18 ' . 18 '' ) and the third of the three centers ( 44m ) with a third pole of the conductive connection ( 14 . 14 ' . 14 '' ) connected is. Circuit ( 10 . 10 ' . 10 '' ) according to claim 10, wherein each bridge ( 32 . 34 . 44 ) two switchable Elements ( 32a . 32b . 34a . 34b . 44a . 44b ), wherein a first of the two switchable elements ( 32a . 34a . 44a ) between the first voltage tap ( 16a ' ) and the center ( 32m . 34m . 44m ) the bridge ( 32 . 34 . 44 ) and wherein a second switchable element ( 32b . 34b . 44b ) between the middle pole ( 32m . 34m . 44m ) and the second voltage tap ( 16b ' ) is arranged. Circuit ( 10 . 10 ' . 10 '' ) according to claim 10 or 11, wherein the third pole of the conductive connection ( 14 . 14 ' . 14 '' ) another first throttle ( 15 . 15a ' . 15b ' . 15a '' . 15b '' . 15c '' ). Circuit ( 10 . 10 ' . 10 '' ) according to claim 12, wherein the first, second and third poles of the conductive connection ( 14 . 14 ' . 14 '' ) each have a second throttle ( 17a ' . 17b ' . 17a '' . 17b '' . 17c '' ), wherein the first throttle ( 15 . 15a ' . 15b ' . 15a '' . 15b '' . 15c '' ) and the second throttle ( 17a ' . 17b ' . 17a '' . 17b '' . 17c '' ) of the first and the first throttle ( 15 . 15a ' . 15b ' . 15a '' . 15b '' . 15c '' ) and the second throttle ( 17a ' . 17b ' . 17a '' . 17b '' . 17c '' ) of the second and the first throttle ( 15 . 15a ' . 15b ' . 15a '' . 15b '' . 15c '' ) and the second throttle ( 17a ' . 17b ' . 17a '' . 17b '' . 17c '' ) of the third pole are each arranged to form a series arrangement, so that each pole has a center node between the first and second reactor ( 15 . 15a ' . 15b ' . 15a '' . 15b '' . 15c '' . 17a ' . 17b ' . 17a '' . 17b '' . 17c '' ), and wherein the center node of the first pole, the center node of the second pole and the center node of the third pole are coupled together to a common node connecting the neutral conductor ( 14d '' ). Circuit ( 10 . 10 ' . 10 '' ) according to claim 13, wherein the center of the first pole, the center of the second pole and the center of the third pole each have a capacitance ( 48a . 48b . 48c ) are connected to the common node for network filtering. Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 6 to 14, wherein the power converter circuit ( 18 . 18 ' . 18 '' ) a DC link capacity ( 36 . 36 ' ) between the first and second voltage taps ( 16a ' . 16b ' ) of the power converter circuit ( 18 . 18 ' . 18 '' ) are arranged. Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 10 to 15, wherein the power converter circuit ( 18 . 18 ' . 18 '' ) a DC link capacity ( 36 . 36 ' ) with two capacitors connected in series ( 36a ' . 36b ' ) between the first and second voltage taps ( 16a ' . 16b ' ) of the power converter circuit ( 18 . 18 ' . 18 '' ) and wherein a midpoint ( 36m '' ) between the two capacitors ( 36a ' . 36b ' ) with a neutral 14d '' of the conductive connection ( 14 . 14 ' . 14 '' ) connected is. Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 1 to 16, wherein the inductive terminal ( 12 . 12 ' . 12 '' ) a high frequency coupler ( 24 ). Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 2 to 16, wherein the inductive terminal ( 12 . 12 ' . 12 '' ) a high frequency coupler ( 24 ) connected between the first and the second pole of the inductive terminal ( 12 . 12 ' . 12 '' ) is switched. Circuit ( 10 . 10 ' . 10 '' ) according to claim 17 or 18, wherein the high-frequency coupler ( 24 ) has a coil. Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 17 to 19, wherein at least one of the one or more capacitors ( 13 . 13a ' . 13b ' ) of the inductive terminal ( 12 . 12 ' . 12 '' ) with the high-frequency coupler ( 24 ) is connected in series. Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 17 to 20, wherein at least one of the one or more capacitors ( 13 . 13a ' . 13b ' ) of the inductive connection ( 12 . 12 ' . 12 '' ) with respect to the high-frequency coupler ( 24 ) is connected in parallel. Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 17 to 21, wherein an inductance of the high-frequency coupler ( 24 ) and / or the capacity of the one or more capacitors ( 13 . 13a ' . 13b ' ) is selected such that a resonant frequency results, which is in the high frequency range. Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 1 to 22, wherein the DC voltage connection ( 16 . 16 ' . 16 '' ) a DC-DC converter ( 38 ). Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 1 to 22, wherein an energy store ( 40 ) with the DC voltage connection ( 16 . 16 ' . 16 '' ) is coupled. Circuit ( 10 . 10 ' . 10 '' ) according to one of claims 7 to 24, wherein each switchable element ( 32a . 32b . 34a . 34b . 44a . 44b ) has a parallel diode.

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