Electrical transmission or interconnection systems – Electromagnet or highly inductive systems
Reexamination Certificate
1999-06-07
2001-07-24
Ballato, Josie (Department: 2836)
Electrical transmission or interconnection systems
Electromagnet or highly inductive systems
C307S125000, C191S010000
Reexamination Certificate
active
06265791
ABSTRACT:
FIELD OF THE INVENTION
The present invention concerns an energy transmission device for the contactless transmission of energy from a primary current line (
2
), through which alternating current flows, to a number of secondary, resonant load circuits (
100
,
200
) with at least one coil (
5
) each which draws energy from the electromagnetic field of the current lead (
2
).
BACKGROUND OF THE INVENTION
Energy transmission devices of this type are used to transmit electric energy from a stationary current lead of a primary circuit to the secondary circuit of a mobile consumer Possible applications are, for example, in industrial assembly conveyor systems or passenger vehicles.
In these situations the contactless inductive energy transmission is advantageous. It avoids the use of sliding contacts that are prone to wear. Moreover, difficulties are avoided with respect to protecting exposed lines when installing the current lead on the floor and poor contacting due to contaminated lines. By installing the lines in the floor, ceiling or walls, the danger of contacting of previously conventional current-carrying rails can be eliminated.
Known systems can be problematic in the event of simultaneous use by several consumers. The cause of this is the interaction between consumer and the stationary current lead.
In normal operation, an alternating current flows through the primary circuit. The secondary circuit of the consumer forms an oscillating circuit that is coupled with the primary circuit via the coil of the oscillating circuit and resonates at the frequency of the primary circuit.
If a consumer is drawing little energy from the primary circuit, then this means an increased impedance in the load circuit. This impedance is mirrored in the primary circuit by the transformer effect. Due to this increased impedance in the primary circuit, the flow of current through the primary circuit is impeded and thus the supply for other consumers is reduced. If no energy is used, then the coil of a consumer can completely block the flow of current in the primary conductor. Thus, further consumers cannot be operated independently of the first consumer and not individually regulated in their power consumption.
One attempt to overcome this problem can be found in the patent PCT 92/17929. In this case, an electric or mechanical decoupling device is installed on each consuming device. However, this concept requires that, for example, a large-scale decoupling device, e.g. a hydraulic piston, be transported on consumer vehicles.
WO 93/23909 describes a system in which the primary circuit has guidance loops arranged behind one another in the direction of travel. These guidance loops are bypassed and thus not traversed by current if there is no consumer in the area of its electric field. However, this concept does not offer a solution for the operation of several consumers since, in this case, parts of lines not used are not to be disconnected but, instead, several consumers are to be supplied in spite of a blocked primary line.
SUMMARY OF THE INVENTION
Thus, it is the object of the invention to design an energy transmission device of this type in such a way that several consumers can be easily supplied with energy independent of one another.
The object is solved by an auxiliary line that runs parallel to the current lead and is connected with the current lead via several connecting points in order to be able to conduct the current from a first connecting point via the auxiliary line to a second connecting point and that at least in one section of the line, between two connecting points, an adjustable impedance is provided in the auxiliary line which is controlled by a monitoring device in order to prevent blocking of the line by a disconnected consumer.
REFERENCES:
patent: 4836344 (1989-06-01), Bolger
patent: 5293308 (1994-03-01), Boys et al.
patent: 5311973 (1994-05-01), Tseng et al.
patent: 5528113 (1996-06-01), Boys et al.
patent: 5619078 (1997-04-01), Boys et al.
patent: 5821638 (1998-10-01), Boys et al.
patent: 5938151 (1999-08-01), Takasan et al.
Eberl Bernhard
Vonhof Eberhard
Ballato Josie
Larson & Taylor PLC
Rios Roberto
Wampfler Aktiengesellschaft
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