Arrangement for contactless inductive transmission of...

H - Electricity – 01 – F

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H01F 38/00 (2006.01) H02J 5/00 (2006.01) H02J 17/00 (2006.01)

Patent

CA 2215291

A device for the contactless inductive transmission of electric energy to a movable consumer has a stationary primary circuit designed as an arrangement of elongated parallel leads connected to a source of high frequency alternating voltage or current and a transmission head arranged on the movable consumer. The transmission head consists of a ferrite core and of a secondary winding that surrounds the ferrite core and is magnetically coupled to the primary circuit. The primary circuit lead arrangement has an outer lead designed as an almost closed housing (7) and a middle lead (6) arranged approximately at the center of the housing. The current (II) that flows in the outer lead has the same intensity but an opposite flow direction to the current in the middle lead. The middle lead (6) is surrounded by a U-shaped ferrite core (2) that carries the secondary winding (W2). In order to transmit electric energy independently and at the same time to several movable consumers, a constant medium frequency current (J1) flows through the transmission device. The current is kept constant in that the transmission arrangement is connected in parallel to a capacitor (CE) connected in series to an inductor (LE) and to a medium frequency voltage source (MFG1). A resonance is created between the inductor (LE) and the capacitor (CE) at the frequency (fo) of the medium frequency voltage source (MFG1).

Un dispositif de transmission sans contact d'énergie électrique à un consommateur mobile comprend un circuit primaire stationnaire constitué d'un agencement de conducteurs parallèles allongés raccordé à une source de courant ou de tension alternative de haute fréquence et une tête de transmission montée sur le consommateur mobile et constituée d'un noyau en ferrite et d'un enroulement secondaire qui entoure le noyau en ferrite. L'enroulement secondaire est magnétiquement couplé au circuit primaire. L'agencement de conducteurs formant le circuit primaire comprend un conducteur extérieur qui forme un boîtier (7) presque fermé et un conducteur central (6) situé à peu près au centre du boîtier. Le courant (I1) qui s'écoule dans le conducteur extérieur a la même intensité mais un sens d'écoulement opposé au courant qui s'écoule dans le conducteur central. Le conducteur central (6) est entouré par un noyau en ferrite en U (2) qui porte l'enroulement secondaire (W2). Afin de transmettre l'énergie électrique en même temps et indépendamment à plusieurs consommateurs mobiles, le dispositif de transmission est traversé par un courant constant de fréquence intermédiaire (J1). Pour assurer la constance du courant, le dispositif de transmission est raccordé en parallèle à un condensateur (CE) connectée en série à la bobine d'inductance (LE) et à une source de tension de fréquence moyenne (MFG1). A la fréquence (fo) de la source de tension de fréquence moyenne (MFG1), une résonance se crée entre la bobine d'inductance (LE) et le condensateur (CE).

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