A connector for use in connecting a communication element to a transmission line in a wired pipe segment includes a first female end adapted to surround and make electrical contact with a coupler connection that extends away from a communication element of the coupler; a second female end adapted to receive an inner conductor of a coaxial cable; and an inner connection element formed on an inner surface of the connector adapted to electrically connect the coupler connection and the inner conductor, the inner connection element formed such that it does not completely surround at least one of the inner conductor and the coupler connection.

Apparatus and methods of automatically trimming a PCB-based LC circuit. The apparatus may comprise an interface to a printed circuit board (PCB). The PCB may include a PCB inductor and a PCB capacitor to form an LC circuit. The LC circuit may have an LC circuit frequency. The apparatus may comprise a variable capacitor communicatively coupled to the interface and configured to adjust an effective capacitance of the LC circuit.

Apparatus and methods of automatically trimming a PCB-based LC circuit. The apparatus may comprise an interface to a printed circuit board (PCB). The PCB may include a PCB inductor and a PCB capacitor to form an LC circuit. The LC circuit may have an LC circuit frequency. The apparatus may comprise a variable capacitor communicatively coupled to the interface and configured to adjust an effective capacitance of the LC circuit.

A filter device is mounted on a module substrate and is shielded by a shield member. The filter device has first and second side surfaces opposed to each other. A ground terminal and signal terminals are formed on a bottom surface of the filter device. The shield member includes side wall portions facing the first and second side surfaces. The filter device includes plural LC parallel resonance circuits therein. The inductors of the LC parallel resonance circuits are arranged in parallel with the first side surface and the bottom surface. Each inductor extends upward from its end portion electrically connected to the ground terminal, extends from the first side surface toward the second side surface, and then extends toward the bottom surface. The gap between the first side surface and the corresponding side wall portion is smaller than that between the second side surface and the corresponding side wall portion.

Systems and methods are provided for wireless transmission of power or information. A supplying system include a signal source and a transmitter unit. A consuming system includes an electrical load and a receiver unit. Electrical power or information are transmitted wirelessly from the supplying system to the consuming system. The transmitter unit can include a step up transformer. The receiver unit can include a step down transformer. The transmitter unit and receiver unit are not connected to a common ground, resulting in a truly wireless system for transmitting power or information.

According to one embodiment, in an isolator, a first capacitive element is arranged on a first signal line. The first capacitive element has one end electrically connected to an input side circuit and having another end electrically connected to an output side circuit. A second capacitive element is arranged on a second signal line. The second capacitive element having one end electrically connected to the input side circuit and having another end electrically connected to the output side circuit. A first inductive element has one end electrically connected to a first node between the first capacitive element in the first signal line and the output side circuit. A second inductive element has one end electrically connected to a second node between the second capacitive element in the second signal line and the output side circuit.

Disclosed herein is a symmetric split planar transformer in the context of a DC-DC isolated converter. The symmetric split planar transformer reduces or eliminates asymmetry in the distribution of parasitic capacitance across the isolation barrier going from one end to another end of a primary coil, and as a result, undesirable electromagnetic interference (EMI) due to common mode dipole emission across the isolation barrier may be reduced. In some embodiments, the primary winding is split into at least a first coil and a second coil, each occupying a different area side-by-side on a substrate. The transformer is symmetric in the sense that a capacitive coupling of the first coil to a secondary winding is the same as a capacitive coupling of the second coil to the secondary winding, such that common mode EMI may be reduced. Each coil may include stacked spiral coil portions in multiple metal planes to increase inductive density across the isolation barrier. Furthermore, in some embodiments the first and second coils may have opposite spiral directions such that far field radiation effect from the transformer may be reduced.

In a wireless power transfer apparatus, a characteristic adjuster has a frequency characteristic that causes, in a power transfer mode from at least one power transmission unit to a power receiving apparatus, a resonant power transmission circuit to have a resonance frequency that substantially matches an operating frequency. The reactance of a power transmission coil has a reference value in the power transfer mode. The frequency characteristic of the characteristic adjuster causes, in a power non-transfer mode from the at least one power transmission unit to the power receiving apparatus, a reactance of a power transmission coil to become an adjusted value that is higher than the reference value.

A power transmitter comprises a transmitter coil (103) generating an electromagnetic field. A set of balanced detection coils (207, 209) comprises detection coils in series and compensating each other. A foreign object detector (205) performs foreign object detection, by potentially detect a foreign object in response to a property of an output signal from the set of balanced detection coils (207, 209) in response to the electromagnetic test meeting a foreign object detection criterion. A communicator (211) is coupled to a communication antenna (213) communicates with a power receiver (105) via this. The communication antenna (213) comprises a plurality of communication coils (215, 217) coupled in parallel. A first segment of a first communication coil (215) has a first coupling to a first detection coil and a second segment of a second coil (217) has a second coupling to a second detection coil. The couplings are capacitive and/or inductive couplings and the first coupling and the second coupling compensate each other in the output signal.

The invention relates to a method for charging a vehicle battery by induction from a charging device including a charge transmitter including a primary coil L1 and an inverter capable of supplying the primary coil L1 with an AC supply voltage E. Said device also includes a charge receiver including a secondary coil L2 arranged in a vehicle. Said method consists of adjusting a frequency f of the power supply voltage (E) to the resonance frequency fo, when a motor vehicle is located in a parking space. Said method comprises the following steps: setting a first power-transmission parameter (E, f); starting an iterative test which consists of: setting a value of a second power-transmission parameter (E, f); varying the second power-transmission parameter (E, f) in a second authorized adjustment range; measuring the power (Pbat) transmitted between the charge transmitter and the charge receiver; determining if the power (Pbat) is no lower than a predetermined operating threshold (PObj); determining if the power (Pbat) increases; ending the iterative test if the transmitted power (Pbat) is higher than the predetermined operating threshold (PObj); setting the power supply voltage (E) in order to reach the measured transmitted power (Pbat), said first and second transmission parameters being set to the previously established value thereof.