DE102011113336B4 - Arrangement for monitoring an arrangement for inductive energy transmission from a stationary part of the system to a mobile part - Google Patents

Abstract

Arrangement for monitoring an arrangement for inductive energy transmission from a stationary part of the system to a mobile part, a secondary winding being inductively coupled to a primary winding, the primary winding being fed from a mains-fed feed unit, which has means for determining the power fed to the primary winding, the feed unit having an inverter which is fed from a DC voltage which is generated by rectifying the mains voltage, the AC voltage provided on the output side by the inverter being fed to a converter which converts the voltage source represented by the inverter into a current source represented on the output side of the converter, the converter being a is designed as a gyrator quadrupole, its impedances, so all of the capacities and inductances included, tuned to the frequency of the voltage made available by the inverter resonant so that a current that is as constant as possible is impressed into the primary winding, the secondary-side electronics unit comprising a capacitance connected in parallel or in series with the secondary winding such that the associated resonance frequency corresponds to the frequency of the current fed into the primary winding, with the power supplied to the primary winding is determined and the power received by the secondary winding is determined, the recorded values being fed to an evaluation unit which generates an output signal that is at least dependent on these values, the evaluation unit and the primary winding being stationary and the power value received from the secondary winding via a data transmission channel is transmitted from a unit connected to the secondary winding to a stationary unit connected to the evaluation unit, the data transmission channel having an inductive coupling (2) in that the primary side and / or an additional winding is provided on the secondary side, so that data can be transmitted via the additional inductive coupling thus produced.

Description

The invention relates to an arrangement for monitoring an arrangement for inductive energy transmission from a stationary system part to a mobile part.

It is generally known to monitor a spatial area by means of sensors so that the penetration of foreign bodies can be detected.

An inductive energy transmission is known from US 2011/0196444 A1, in which the primary coil is supplied from a voltage source and the secondary coil directly feeds a rectifier. In addition, backscatter modulation or RFID, i.e. radio waves, are used for data transmission.

The invention is therefore based on the object of developing a device for energy transmission, the aim being to increase safety.

According to the invention, the object is achieved with the arrangement for monitoring an arrangement for inductive energy transmission from a stationary system part to a mobile part according to the features specified in claim 1.

Important features of the arrangement for monitoring an arrangement for inductive energy transmission, in particular from a stationary system part to a mobile part, are that a secondary winding is inductively coupled to a primary winding,
the power supplied to the primary winding being determined and the power received by the secondary winding being determined, the detected values being fed to an evaluation unit which generates an output signal that is at least dependent on these values.

The advantage here is that the security is increased in a cost-effective manner. This is because the transmission means that are already present, in particular the primary winding and secondary winding, are used as the sensor. If foreign bodies penetrate the transmission area or if there is any other reduction in the transmitted power, this drop in performance can be detected and, if an impermissibly high value is exceeded, a safety warning can be generated, displayed and / or forwarded. Even after the handset has been parked, the transmitted power can be determined and the difference to the maximum possible power can be determined from this. If an impermissibly high difference is exceeded, the feed unit is switched off, i.e. the current in the primary winding is switched off, or a safety warning is generated, displayed and / or reported.

In an advantageous embodiment, the evaluation unit is arranged stationary, in particular together with the primary winding, and the power value received from the secondary winding via a data transmission channel,
in particular via a non-wired, contactless, contactless, inductive, radio and / or infrared data transmission channel,
is transmitted from a unit connected to the secondary winding to a stationary unit connected to the evaluation unit. The advantage here is that data transmission of the detected signal, in particular power signal, can be transmitted to the stationary side arranged on the primary side, that is to say to the corresponding part of the installation. Thus, the secondary winding can be arranged on the mobile part, which is ready to receive the inductively transmitted energy after entering the area of the inductive coupling.

In an advantageous embodiment, the secondary winding is connected to a secondary-side electronics unit which comprises a rectifier from which a load arranged on the secondary side, in particular at least one energy store and / or an electromotive drive, can be fed. The advantage here is that the power received on the secondary side can be brought to the desired voltage level and thus a voltage of the load, in particular the energy store, that is as constant as possible can be made available.

In an advantageous embodiment, the primary winding is fed from a mains-fed feed unit which has means for determining the power supplied to the primary winding. The advantage here is that the power can be determined in a simple manner and therefore no additional sensors are necessary.

In an advantageous embodiment, the evaluation unit has a means for determining the difference between the power supplied to the primary winding and the power received by the secondary winding and a means for monitoring the difference for a critical value, in particular for an impermissibly high difference. The advantage here is that these means can be implemented as software in a microcontroller. Therefore, no great effort is necessary.

In an advantageous embodiment, the feed unit has, as a means for determining the power supplied to the primary winding, a means for determining the voltage applied to the primary winding and a means for determining the current flowing through the primary winding, as well as means for determining a product of that at the primary winding applied voltage value and the current value flowing through the primary winding, in particular with effective values being determined as current and voltage. The advantage here is that no additional sensors are necessary, since a voltage sensor and a current sensor for regulating the current in the primary winding are available anyway.

In an advantageous embodiment, the secondary side has a means for determining the voltage applied to the secondary winding and a means for determining the current flowing through the secondary winding as well as a means for determining a product of the voltage value applied to the secondary winding and the current value flowing through the secondary winding, in particular, the effective values being determined as current and voltage. The advantage here is that the electrical power received on the secondary side can be determined in a simple manner.

Further advantages result from the subclaims.

• In der 1 ist die Erfindung schematisch skizziert.

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

• In the 1 the invention is outlined schematically.

For example, a power supply unit supplied with mains voltage 1 an alternating current impressed in a primary winding.

The feed unit is preferably 1 Stationary arranged and the primary winding laid in the ground. The feed unit has an inverter which is fed from a direct voltage that is generated by rectifying the mains voltage. The alternating voltage provided on the output side by the inverter is fed to a converter which converts the voltage source represented by the inverter into a current source represented on the output side of the converter. A four-pole, which is designed as a gyrator, is suitable as a converter for this purpose; wherein the impedances, in particular all of the capacitances and inductances it encompasses, are resonantly tuned to that frequency which corresponds to the voltage made available by the inverter. In this way, a current that is as constant as possible is impressed in the primary winding.

A secondary winding of a mobile part is inductively coupled to the primary winding. This mobile part can be designed as an electric vehicle and has an electric motor drive which can be supplied from an energy store.

The output current of the secondary winding of the inductive coupling 2 becomes a secondary electronics unit 3 fed that a load 4th feeds, which includes the energy store and the drive. So it is from the secondary electronics unit 3 the energy storage is rechargeable.

The electronic unit on the secondary side initially comprises a capacitance connected in parallel or in series with the secondary winding such that the associated resonance frequency corresponds to the frequency of the current fed into the primary winding.

In addition, the secondary winding becomes an electronic unit on the secondary side 3 Comprehensive rectifier fed, its output voltage directly or via a boost converter or buck converter of a load 4th is made available. In particular, the load also includes the energy store and the electromotive drive that can be supplied by it.

From the secondary electronics unit 3 is also the secondary side via the inductive coupling 2 transmitted power is recorded and used as a second signal 5 via a data transmission channel 6 an evaluation electronics 8th fed

Here is the data transmission channel 6 from the mobile unit to the stationary evaluation electronics 8th Contactless using radio waves, such as a WLAN interface, can be carried out. Alternatively, the data transmission channel is 6 but also via inductive coupling 2 can be transmitted by modulating a higher frequency current component onto the current components provided for the transmission of the power and this being transmitted inductively, in particular from the secondary side to the primary side. As a further alternative, an additional winding can also be provided on the primary and / or secondary side, so that data can be transmitted via the additional inductive coupling produced in this way. As a further alternative, the data stream can also be reached via pulsating control of the current in the inductive coupling.

Also from the supply unit 1 Power provided to the primary winding is detected and used as the first signal 7th to the evaluation electronics 8th transfer.

The evaluation electronics 8th thus generates from the first and second signal ( 7th , 5 ) an output signal 9 which includes warning information such as error message or the like.

For this purpose, in the simplest exemplary embodiment, the first signal is combined with the second signal ( 7th , 5) and an error message is generated if an impermissibly high deviation is exceeded. This is because the power difference can be generated by an object, in particular an electrically conductive object, which is in the area of the inductive coupling 2 has penetrated, or the difference in performance is diverted into an unforeseen space or is caused by a defective component.

A power difference of, for example, 2% to 5% is critical and can cause a fire hazard if a foreign body that has penetrated in the area of the inductive coupling is heated.

In a further exemplary embodiment according to the invention, the course of the first and the course of the second signal ( 7th , 5 ) and generates the output signal from it. In particular, both signals ( 7th , 5 ) filtered, in particular with a low pass, and thus the risk of false warnings is reduced.

List of reference symbols

1

Feed unit

2

inductive coupling, comprising primary winding and secondary winding

3

secondary electronics unit

4th

Load, in particular having an energy store

5

second signal

6th

Data transmission channel

7th

first signal

8th

Evaluation electronics

9

Output signal, in particular include error signal

Claims (5)

Arrangement for monitoring an arrangement for inductive energy transmission from a stationary system part to a mobile part, wherein a secondary winding is inductively coupled to a primary winding, wherein the primary winding is fed from a mains-fed feed unit which has means for determining the power supplied to the primary winding wherein the feed unit has an inverter which is fed from a direct voltage which is generated by rectifying the mains voltage, wherein the alternating voltage provided by the inverter on the output side is fed to a converter which converts the voltage source represented by the inverter into a current source represented on the output side of the converter, the converter being a quadrupole designed as a gyrator, its impedances, i.e. all capacitances and inductances it encompasses, are resonantly tuned to the frequency of the voltage provided by the inverter, so that a current that is as constant as possible is impressed in the primary winding wherein the secondary-side electronics unit comprises a capacitance connected in parallel or in series with the secondary winding such that the associated resonance frequency corresponds to the frequency of the current fed into the primary winding, determining the power supplied to the primary winding and determining the power received by the secondary winding, the recorded values being fed to an evaluation unit which generates an output signal that is at least dependent on these values, wherein the evaluation unit and the primary winding are stationary and the power value received from the secondary winding via a data transmission channel from a unit connected to the secondary winding is transferred to a stationary unit connected to the evaluation unit, wherein the data transmission channel has an inductive coupling (2) in that an additional winding is provided on the primary and / or secondary side, so that data can be transmitted via the additional inductive coupling thus produced. Arrangement according to Claim 1 , characterized in that the secondary winding is connected to a secondary-side electronics unit which comprises a rectifier from which a load arranged on the secondary side, in particular at least one energy store and / or an electric motor drive, can be fed. Arrangement according to at least one of the preceding claims, characterized in that the evaluation unit has a means for determining the difference between the power supplied to the primary winding and the power received by the secondary winding and a means for monitoring the difference for a critical value, in particular for an impermissible value high difference. Arrangement according to at least one of the preceding claims, characterized in that the feed unit, as a means for determining the power supplied to the primary winding, has a means for determining the voltage applied to the primary winding and a means for determining the current flowing through the primary winding and a means for determining a Product of the voltage value applied to the primary winding and the current value flowing through the primary winding, in particular wherein effective values are determined as current and voltage. Arrangement according to at least one of the preceding claims, characterized in that on the secondary side a means for determining the voltage applied to the secondary winding and a means for determining the current flowing through the secondary winding as well as a means for determining a product of the voltage value applied to the secondary winding and the has current value flowing through the secondary winding, in particular wherein effective values are determined as current and voltage.

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