DE102011115092B4 - System for contactless transmission of energy and data - Google Patents

Abstract

System for contactless transmission of energy and data,
wherein a mobile part is arranged movable relative to a plant part,
wherein the plant part has a first power coil and a first communication coil,
wherein the mobile part has a second power coil, which can be inductively coupled to the first power coil,
wherein the mobile part has a second communication coil, which can be inductively coupled to the first communication coil,
wherein each power coil has two windings and each communication coil has two windings,
wherein the first winding of the first power coil and the first winding of the first communication coil to the same coil core, in particular ferrite core, are wound
wherein the second winding of the first power coil and the second winding of the first communication coil are wound around the same core, in particular ferrite core,
wherein the first winding of the second power coil and the first winding of the second communication coil are wound around the same core, in particular ferrite core,
wherein the second winding of the second power coil and the second winding of the second communication coil are wound around the same core, in particular ferrite core,
wherein the windings are each designed with such a winding sense that no, in particular no significant total voltage at the first and / or second communication coil of the first and / or second power coil is inducible.

Description

The invention relates to a system for contactless transmission of energy and data.

In a system for contactless transmission of energy and data is known to inductively transmit energy from a primary coil to a secondary coil. In addition, by modulating current components whose frequency is higher than the frequency used for energy transfer, data is transferable between the two coils.

From the DE 100 12 981 A1 For example, a device for contactless transmission of electrical energy and electronic data between a stationary and a rotating unit is known.

From the DE 10 2010 001 709 A1 a charging system for charging electric vehicles is known.

From the DE 60 2004 010 140 T2 For example, unidirectional current and bidirectional data transmission over a single inductive coupling is known.

The invention has the object of developing a system for contactless transmission of energy and data, with a secure data transmission should be executable.

According to the invention, the object is achieved in the system for contactless transmission of energy and data according to the features specified in claim 1.

Important features of the invention in the system for contactless transmission of energy are that a mobile part is arranged movable relative to a plant part,
wherein the plant part has a first power coil and a first communication coil,
wherein the mobile part has a second power coil, which can be inductively coupled to the first power coil,
wherein the mobile part has a second communication coil, which can be inductively coupled to the first communication coil,
in particular wherein energy can be transmitted by means of the inductive coupling between the first and second power coil and that data can be transmitted between the first and second communication coil,
wherein each power coil has two windings and each communication coil has two windings,
in particular, wherein the winding axes of all windings are aligned in parallel,
wherein the windings are each designed with such a winding sense that no, in particular no significant total voltage at the first and / or second communication coil of the first and / or second power coil is inducible.

The advantage here is that the data transmission from the power transmission is undisturbed executable because the alternating magnetic field generated by the power coil induces no or at least no significant total voltages in the communication coil. By dividing the coil into windings, the induction effects, ie induced voltages, cancel out in the case of opposing windings. This is most easily done if the wrapped area is the same and the number of turns is the same.

Thus, if the communication coil is composed of two opposing windings, the induced voltages are the same amount and provided with different signs. Thus, as a total voltage results in a vanishing voltage at the communication coil. This applies in particular when the power coil generates an equally strong alternating field in the area of the wrapped surfaces of the windings of the communication coil. This can be easily achieved, in particular, when the power coil generates a homogeneous field in the region of the windings of the communication coil.

In an advantageous embodiment, the first and second windings of the first communication coil have different winding senses,
wherein the first and second windings of the first power coil have the same winding sense,
wherein the first and second windings of the second communication coil have different winding sense,
wherein the first and second windings of the second power coil have the same winding sense,
in particular wherein the first windings of the two power coils have the same winding sense and wherein the first windings of the two communication coils have the same winding sense. The advantage here is that in a simple way, the data transmission undisturbed by the power transmission, so power transmission is possible.

Although an electrical power or energy is transmitted in the data transmission, but this is neglected against the at least one hundred times greater transmission from the first to the second power coil.

In an alternative advantageous embodiment, the first and second windings of the first power coil have different winding senses,
wherein the first and second windings of the first communication coil have the same winding sense,
wherein the first and second windings of the second power coil have different winding senses,
wherein the first and second windings of the second communication coil have the same winding sense,
in particular wherein the first windings of the two power coils have the same winding sense and wherein the first windings of the two communication coils have the same winding sense. The advantage here is that once again data and energy are transferable independently. In this case, the opposing design of the windings can be carried out either in the communication coil or in the power coil. It is important, however, that in opposite directions execution of the windings of the communication coil to perform the windings of the power coil in the same direction and vice versa.

According to the invention, the first winding of the power coil and the first winding of the communication coil are wound around the same first coil core, in particular ferrite core
and or
the second winding of the power coil and the second winding of the communication coil are wound around the same second coil core, in particular ferrite core,
in particular wherein the first and second spool core are made in one piece, in particular designed as legs of a U-shaped spool core. The advantage here is that a simple and inexpensive design is possible.

In an advantageous embodiment, the first and second windings are spaced apart, in particular in that plane whose normal direction is aligned parallel to the winding axis. The advantage here is that a planar coil arrangement is executable and thus a production of the coil winding as a conductor track.

In an advantageous embodiment, by means of the communication coils from the handset a signal upon arrival of the handset in the inductive coupling region can be transmitted. The advantage here is that a data exchange is made possible even before the arrival of the second power coil in the inductive coupling region to the first power coil. Thus, a parking aid can be realized by data transferred between the handset and stationary equipment part and in this way the handset is paid to the desired target position range.

In an advantageous embodiment of the second power coil, an energy storage and / or an electric drive of the handset can be fed. The advantage here is that the energy storage is loaded and thus from the energy storage of the drive of the handset is supplied. In this way, an electrical charge in the inductive coupling region executable and subsequently supplying the drive from the energy storage.

In an advantageous embodiment, by means of the communication coils a dependent of the charge state of an energy storage of the handset power setpoint from the handset to the part of the plant, the plant part has a first power coil feeding the controller, which controls the current flowing in the power coil current to a value corresponding to the current set value , In particular wherein the actual current of the first or second power coil is detected and is provided to a controller controlling the controller. The advantage here is that a charge current control is executable by the state of charge is detected on the handset and a corresponding value is transmitted to the stationary part of the system, which in turn is provided by this primary side. Since the current emerging from the second power coil on the secondary side corresponds to the current provided on the primary side, in particular depends on this, the secondary-side current is proportional or at least clearly dependent on the primary-side current.

In an advantageous embodiment, the area wrapped by the windings of the communication coils and / or the maximum distance between two points of the wrapped surfaces is greater than the area wrapped by the windings of the power coils or the corresponding maximum distance between two points of the corresponding wound surfaces. The advantage here is that during the retraction of the handset in the inductive coupling region of the power coils before a data transfer is executable, in particular for the identification of the vehicle and / or to carry out an automatic parking aid.

In an advantageous embodiment, a compensation winding is additionally provided on the coil core, in particular on the primary side, in particular wherein the first power coil, the first communication coil and the compensation coil are arranged in a, in particular single, plane coil arrangement are executed. The advantage here is that a compensation is easy and directly detectable and / or executable.

In an advantageous embodiment, the communication coil and the power coil, in particular and the compensation coil, as a flat winding on a printed circuit board, in particular on a multi-layer printed circuit board executed, in particular wherein the conductor tracks are designed for this purpose as a concentric or spirally extending conductor tracks. The advantage here is that a simple low-cost mass production is possible.

Further advantages emerge from the subclaims. The invention is not limited to the combination of features of the claims. For the skilled person, further meaningful combination possibilities of claims and / or individual claim features and / or features of the description and / or figures, in particular from the task and / or posing by comparison with the prior art task arise.

The invention will now be explained in more detail with reference to schematic illustrations:

In the 1 is a schematic cross section through the inventive arrangement for the inductive transmission of energy and information shown.

In the 2 an associated side view is shown.

In the 3 a side view is shown for a similar embodiment.

In the 4 a side view is shown for a similar embodiment.

As in 1 and also in the 2 shown, the arrangement has a system on the primary side 1 and one on the secondary side 2 arranged respective part, wherein these parts are arranged relative to each other movable.

In this case, a power coil L1 is provided on the primary side, which is made of one or more co-wound coils in the same direction.

The magnetic flux M generated by the power winding L1 when energized also penetrates a primary side disposed communication winding K1, which is also composed of at least two windings whose winding sense is opposite to each other.

Because both windings have the same number of turns and are exposed to the same magnetic flux, the magnetic flux M does not induce a total voltage at the series connection of the communication windings forming the communication coil K1.

According to the power coil L1, the power winding L2 arranged on the secondary side is constructed of windings, so that the voltages induced by the magnetic flux on the series connection of the windings of the power winding L2 generate a total voltage.

Preferably, each winding of the primary-side power coil L1 is associated with a corresponding winding of the secondary-side power coil L2.

Accordingly, the secondary side arranged communication coil K2 is made of windings whose winding sense are opposite to each other and which are connected in series. Thus, in turn, no total voltage is induced in the communication coil K2 by the primary-side power winding L1. The number of turns of the windings of the coil is preferably the same.

The power coils are thus inductively coupled and it is thus from the primary side 1 on the secondary side 2 the transmission of energy inductively executable. The transmitted energy is supplied on the secondary side to a consumer and / or an energy store. For example, an energy storage device, such as accumulator or battery, can be charged when supplying energy. Depending on the state of charge of the energy storage is a charging current from the power coil 2 can be fed to the energy store via a rectifier. As a consumer, for example, an electric drive for the vehicle is providable. In this case, the drive has an electric motor.

Signals are transmitted between the communication coils. The assigned inductively transmitted electric power is at least 100 times lower than in the inductive transmission between the power coils L1 and L2. Accordingly, the line cross sections of the winding wires of the power coils L1 and L2 are larger than the line cross sections of the winding wires of the communication coils K1 and K2.

The windings of the coils, in particular of the power coils L1 and L2, are on cores of ferrite 40 executed.

Furthermore, a compensation winding KO is provided on the primary side.

In 2 the coil cores are assigned to each winding and the winding sense is indicated symbolically.

In the 3 is unlike the 2 a common core is used for the windings of a respective coil. In this case, this core is U-shaped or C-shaped.

The first winding of the power coil and the first winding of the communication coil are each carried out on a first leg of the U. The second winding of the power coil and the second winding of the communication coil are each carried out on the second leg of the U.

In the 4 the limbs of the U are made shortened and thus the windings are made flat, wherein the first winding of the power coil and the first winding of the communication coil are arranged concentrically. Likewise, the respective second windings are arranged.

In further embodiments of the invention, the primary coil is designed as a flat winding. For this purpose, the coil is preferably realized on a printed circuit board.

In further embodiments of the invention, a corresponding interconnection or polarity reversal of the windings is carried out instead of the Wickelsinns.

In further exemplary embodiments according to the invention, high-frequency signals are additionally modulated on the current intended for the power coil, so that data can be transmitted in this way. On the secondary side, the data are then filtered out of the currents induced in the secondary-side power coil. Conversely, a data transmission by modulation is possible. Thus, an additional bidirectional communication is executed, which does not interfere with the data transmission between the communication coils K1 and K2.

With the aforementioned embodiments, therefore, an arrangement for contactless transmission of energy is executable. Here, the secondary-side part of the arrangement is provided on a vehicle which has an electric drive and / or an energy store. Thus, by means of the power coil L1 energy can be inductively transmitted to the power coil L2.

The energization is carried out depending on the arrival of the vehicle in the coupling area. Namely, as soon as the vehicle has arrived and thus a signal transmitted by the second communication coil K2 is detected by means of the communication coil K1, the energization is started.

Furthermore, during loading, communication between the vehicle and the primary-side part of the arrangement can be carried out. In particular, a desired value during loading can be specified. In particular, the setpoint can be executed as a setpoint for current. In this way, depending on a state of charge of an energy storage device of the vehicle, the vehicle transmits a current setpoint to the primary-side arrangement, so that the inductively transmitted charge current supplied by the secondary-side power coil to the energy storage device is regulated to an associated current current setpoint value.

The primary-side feed thus provides the charging current requested by the vehicle depending on the state of charge of the energy store.

Upon arrival of the vehicle in the field of inductive coupling a transmission of data for identification of the vehicle is possible, wherein the data from the communication coil K2 to the communication coil K1 are transmitted.

In further embodiments of the invention, the area wrapped by the coils of the communication coils and / or the maximum distance between two points of the wrapped areas is greater than the area wrapped by the coils of the power coils or the corresponding maximum distance between two points of the corresponding wrapped areas.

Thus, when moving the vehicle into the area of the inductive coupling, data transmission by means of the communication coils can be carried out even before the inductive coupling of the power coils. In this case, in particular positioning of the vehicle can be controlled to a desired position.

LIST OF REFERENCE NUMBERS

1

primary

2

secondary side

40

ferrite

K1

primary-side communication coil

L1

primary-side power coil

K2

secondary-side communication coil

L2

secondary-side power coil

KO

compensation winding

M

magnetic river

Claims (11)

A system for the contactless transmission of energy and data, wherein a mobile part is arranged movable relative to a plant part, wherein the plant part comprises a first power coil and a first communication coil, wherein the mobile part has a second power coil, which is inductively coupled to the first power coil, wherein the mobile part has a second communication coil, which can be inductively coupled to the first communication coil, wherein each power coil has two windings and each communication coil has two windings, wherein the first winding of the first power coil and the first winding of the first communication coil around the same coil core, in particular ferrite core , wherein the second winding of the first power coil and the second winding of the first communication coil to the same coil core, in particular ferrite core are wound, wherein the first winding of the second power coil and the first winding of the second communication coil to the same coil core, in particular ferrite core, are wound wherein the second winding of the second power coil and the second winding of the second communication coil to the same coil core, in particular ferrite core, are wound, wherein the windings each carried out with such a sense of winding are that of the first and / or second power coil no, in particular no significant total voltage at the first and / or second communication coil is inducible. System according to claim 1, characterized in that the first and second winding of the first communication coil have different winding sense, wherein the first and second winding of the first power coil have the same sense of winding, wherein the first and second winding of the second communication coil have different winding sense, the first and second winding of the second power coil have the same sense of winding, in particular wherein the first windings of the two power coils have the same sense of winding and wherein the first windings of the two communication coils have the same sense of winding. System according to claim 1, characterized in that the first and second winding of the first power coil have different winding sense, wherein the first and second winding of the first communication coil have the same sense of winding, wherein the first and second winding of the second power coil have different winding sense, wherein the first and second winding of the second communication coil have the same sense of winding, in particular wherein the first windings of the two power coils have the same sense of winding and wherein the first windings of the two communication coils have the same sense of winding. System according to at least one of the preceding claims, characterized in that the first winding of the power coil and the first winding of the communication coil to the same first coil core, in particular ferrite core, wound and / or that the second winding of the power coil and the second winding of the communication coil to the same second coil core, in particular ferrite core, are wound, in particular wherein the first and second coil core are made in one piece, in particular designed as legs of a U-shaped coil core. System according to at least one of the preceding claims, characterized in that the first and second winding are spaced from each other, in particular in that plane whose normal direction is aligned parallel to the winding axis. System according to at least one of the preceding claims, characterized in that by means of the communication coils from the handset a signal upon arrival of the handset in the inductive coupling region is transferable. System according to at least one of the preceding claims, characterized in that from the second power coil, an energy storage and / or an electric drive of the handset is fedis. System according to at least one of the preceding claims, characterized in that by means of the communication coils dependent on the state of charge of an energy storage device of the mobile power setpoint from the handset is transferable to the system part, wherein the equipment part has a first power coil feeding controller, the current flowing in the power coil current to a value corresponding to the current setpoint value, in particular wherein the actual current of the first or second power coil is detected and a control unit controlling the actuator is provided. System according to at least one of the preceding claims, characterized in that the windings of the Communication coil wrapped surface and / or the maximum distance between two points of the wrapped surfaces is greater than the area wound by the windings of the power coils surface or the corresponding maximum distance between two points of the corresponding wrapped surfaces. System according to at least one of the preceding claims, characterized in that a compensating winding is additionally provided on the coil core, in particular on the primary side, in particular wherein the first power coil, the first communication coil and the compensation coil are designed as arranged in one, in particular single, plane coil arrangement. System according to at least one of the preceding claims, characterized in that the communication coil and the power coil, in particular and the compensation coil, are designed as a flat winding on a printed circuit board, in particular on a multilayer printed circuit board, in particular wherein the conductor tracks designed for this purpose as concentric or spirally extending conductor tracks are.

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