Variable inductor

H - Electricity – 01 – F

Patent

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Details

H01F 21/08 (2006.01) H01F 27/24 (2006.01) H01F 29/14 (2006.01)

Patent

CA 2329961

A variable inductor with a saturable core having three legs (42, 43, 44), including a center leg (43) and two outer legs. A control winding (45) is wound on the center leg and two outer windings (46, 47) are connected in parallel and wound on the outer legs. The inductances of the windings on the outer legs vary with the current through the control winding. The current through the control winding varies the saturation level of the outer legs. In one embodiment the inductance of the control winding is substantially constant with a change in current in the control winding. In another embodiment, the outer legs are saturated and the center leg is not saturated. Portions (48-51) of the core connecting the three legs are tapered down from the cross section of the center leg (43) to the cross sections of the outer legs (42, 44). The invention further includes methods of varying the inductance of an inductive circuit element in accordance with a control current.

Cette bobine d'inductance variable présente un noyau saturable comportant trois segments (42, 43, 44), un segment central (43) et deux segments extérieurs. Un enroulement de commande est enroulé sur le segment central, deux enroulements extérieurs (46, 47) étant connectés en parallèle et enroulés sur les segments extérieurs. Les inductances des enroulements des segments extérieurs varient avec le courant traversant l'enroulement de commande. Le courant traversant l'enroulement de commande modifie le niveau de saturation des segments extérieurs. Dans un mode de réalisation, l'inductance de l'enroulement de commande est sensiblement constante, lors d'un changement de courant dans l'enroulement de commande. Dans un autre mode de réalisation, les segments extérieurs sont saturés, tandis que le segment central ne l'est pas. Des portions (48, 51) du noyau reliant les trois segments sont effilées vers le bas, de la section du segment central (43) vers les sections des segments extérieurs (42, 44). L'invention concerne en outre des procédés destinés à faire varier l'inductance d'un élément à circuit inductif, en fonction d'un courant de commande.

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