Abstract: In a method and an apparatus for detecting electrically conductive foreign bodies during inductive energy transmission between a primary coil (1) and a secondary coil (2), at least one sensor coil (5) is arranged between the primary coil (1) and the secondary coil (2), and a current flowing in the sensor coil (5) due to the induced voltage during the energy transmission is detected and evaluated. In this case, the sensor coil (5) is connected to at least one capacitor to form a resonant circuit which is matched to the excitation frequency of the primary coil (1). The phase position of the current in the resonant circuit in relation to a reference signal is then used to determine whether there are electrically conductive foreign bodies (4) between the primary coil (1) and the secondary coil (2). A high degree of sensitivity, also in relation to small electrically conductive foreign bodies within the energy transmission path, is achieved by means of the method and the apparatus.

Abstract: A ground assembly for an inductive charging device for inductively charging a motor vehicle parked on a surface may include a base plate, a flat coil, a core body, a lower hollow space, a support, and a heat-conducting jacket. The base plate may be formed as a cooling plate. The flat coil may include a helically wound conductor. The flat coil may be arranged spaced apart from the base plate. The lower hollow space may be defined between the core body and the base plate. The support may be disposed between the core body and the base plate, and may extend through the lower hollow space. The heat-conducting jacket may connect the core body and the base plate in a heat-transmitting manner, and may surround the at least one support in a jacket-like manner.

Abstract: A ground assembly for an inductive charging device for inductively charging a motor vehicle parked on a surface may include a base plate, a flat coil, a core body, a lower hollow space, a support, and a heat-conducting jacket. The base plate may be formed as a cooling plate. The flat coil may include a helically wound conductor. The flat coil may be arranged spaced apart from the base plate. The lower hollow space may be defined between the core body and the base plate. The support may be disposed between the core body and the base plate, and may extend through the lower hollow space. The heat-conducting jacket may connect the core body and the base plate in a heat-transmitting manner, and may surround the at least one support in a jacket-like manner.

Abstract: A ground assembly for an inductive charging device for inductively charging a motor vehicle parked on a surface may include a base plate, a flat coil, a core arrangement, a lower hollow space, a support, and a heat conducting element. The flat coil may be arranged spaced apart from the base plate. The core arrangement may be arranged between and spaced apart from the base plate and a helically wound conductor of the flat coil. The support may be disposed between a core body of the core arrangement and the base plate, and may extend through the lower hollow space. The flat coil may include a stranded wire carrier, which may include a pressure pedestal arranged co-axially to the support. The heat conducting element may at least partially surround the pressure pedestal and may connect the stranded wire carrier with the core body in a heat-transmitting manner.

Abstract: A charging device includes a passive auxiliary circuit and a rectifier which is connected downstream of the auxiliary circuit. The passive auxiliary circuit includes input nodes and output nodes. Between the input node and the output nodes, two impedances are connected. Here, an imaginary component of the first impedance has a positive non-zero value and an imaginary component of the second impedance a negative non-zero value or vice versa.

Abstract: In a method and an apparatus for detecting electrically conductive foreign bodies during inductive energy transmission between a primary coil (1) and a secondary coil (2), at least one sensor coil (5) is arranged between the primary coil (1) and the secondary coil (2), and a current flowing in the sensor coil (5) due to the induced voltage during the energy transmission is detected and evaluated. In this case, the sensor coil (5) is connected to at least one capacitor to form a resonant circuit which is matched to the excitation frequency of the primary coil (1). The phase position of the current in the resonant circuit in relation to a reference signal is then used to determine whether there are electrically conductive foreign bodies (4) between the primary coil (1) and the secondary coil (2). A high degree of sensitivity, also in relation to small electrically conductive foreign bodies within the energy transmission path, is achieved by means of the method and the apparatus.