A rotation angle detection apparatus includes a movable pattern prepared on an outer peripheral side surface of a rotary shaft and having a shape that changes along a circumferential direction of the outer peripheral side surface; and a stationary pattern fixedly arranged around the rotary shaft so as to face the movable pattern. An overlapping state between the movable pattern and the stationary pattern changes by rotation of the rotary shaft. A physical quantity changing according to a change in the overlapping state between the movable pattern and the stationary pattern is detected, and a rotation angle of the rotary shaft is detected based on the physical quantity.

An apparatus for determining a relative position of a wireless power transmitter from a wireless power receiver is provided. The apparatus comprises a plurality of sense coils, each configured to generate a respective signal under influence of an alternating magnetic field comprising a plurality of wave pulses, each wave pulse occurring in a respective time slot of a plurality of time slots. The apparatus further comprises a processor configured to determine the relative position of the wireless power transmitter from the wireless power receiver based on the respective signal from each of the plurality of sense coils.

There is provided a resolver comprising: a main body including an excitation coil to which an excitation signal is input and a detection coil configured to output a detection signal, wherein one of the excitation coil and the detection coil is provided in a fixed part and the other one thereof is provided in a rotating part; and a signal processor configured to detect a rotation angle of the rotating part on the basis of the detection signal that changes in accordance with the rotation angle.

A device includes a substrate with an excitation coil configured to generate a magnetic field in reaction to an input signal fed in, and with a pickup coil arrangement configured to generate an output signal in reaction to a magnetic field. The excitation coil includes one or more turns arranged around the pickup coil arrangement in a ring-shaped manner in a plan view of the substrate plane. The device further includes a chip package comprising at least one electrical connection connected to the pickup coil arrangement by means of a signal-carrying conductor. In accordance with the concept described herein, the chip package is positioned on the substrate in such a way that the signal-carrying conductor and the one or more turns of the excitation coil do not overlap in a plan view of the substrate plane.

Techniques, methods, systems, and other mechanisms for measuring the excursion of a speaker while being actively driven. Measuring excursion can involve attaching a flexible printed coil (FPC), including a sense coil, to the speaker, and monitoring an induced current as produced though the sense coil, and further detecting that violation of an excursion limit for the speaker may likely occur.

An apparatus for generating a resolver excitation signal and a vehicle including the same are provided. The apparatus includes an input portion that is configured to receive an input signal and a current amplifier that is configured to generate an output signal by amplifying the input signal and that has a circuit protector that protects a circuit from an overcurrent. An output portion is configured to output the output signal. Additionally, the circuit protector includes a first transistor that has an emitter connected to the output portion, a second transistor that has a collector connected to the output portion and a base connected to a base of the first transistor and a rectifier connected to a base of the first transistor and the base of the second transistor.

An electronic device including a continuity sensor and electrical circuitry configured to detect and report the continuity state of an article, container or product packaging is disclosed. The continuity sensor includes a first substrate with first and second coils thereon, and a second substrate with a third coil thereon. The first coil has an integrated circuit electrically connected thereto. The first substrate is part of, or is attached or secured to a part of the article, container or packaging. The second substrate is another part of, or is attached or secured to another part of the article, container or packaging. One of the article, container or packaging parts is (re)movable with respect to the other part. The first and second coils have one coupling when the article, container or packaging is closed or sealed, and a different coupling when the article, container or packaging is open or unsealed.

A rotation angle sensor system for an optical system that includes a rotor and a stator, includes a stator-based coil system having an inductance and for generating and transmitting a magnetic alternating field, and a rotor-based target that functions as an eddy current element for receiving the magnetic alternating field and generating a magnetic eddy current field. The coil system and the target are mounted or mountable fixedly, with respect to rotation, on the stator and the rotor, respectively, in such a way that different overlaps and/or spatial proximities between the coil system and the target, with correspondingly different effects on the magnetic alternating field of the coil system, result as a function of the rotation angle and/or of the orientation between the stator and the rotor.

A switching operation sensing device to be applied to an electronic device including a touch operation unit having a first touch member integrated with a housing, the switching operation sensing device including a sensing coil component including a first inductor unit disposed on an inner surface of the first touch member, and an oscillator circuit connected to the sensing coil component and configured to generate an oscillation signal having a resonant frequency that changes when a touch operation is input through the touch operation unit, wherein the first inductor unit includes a first sensing area opposing the first touch member, a first sensing wiring disposed in the first sensing area, and a first sensing coil connected between the first sensing wiring and a first resonant circuit of the oscillator circuit.

An electronic device comprising a housing and an actuating element movable relative to the housing, wherein the actuating element comprises at least one metallic component, wherein the device comprises an inductive sensor for detecting a position and/or movement of the actuating element, wherein the inductive sensor comprises: a first measuring resonant circuit having a sensor coil, and an oscillation generator configured to generate an excitation oscillation and to at least temporarily apply the excitation oscillation to the first measuring resonant circuit.