A door handle assembly for a motor vehicle door includes a handle base to be secured to the door, a grip cover coupled to the handle base, an inductive proximity sensor, configured to produce an sensor signal, mounted to the grip cover opposite a portion of an outer surface of the grip cover defining a detection surface thereon, and an electrically conductive layer disposed on an inner surface of the grip cover, opposite the detection surface, and spaced apart from the inductive proximity sensor, the inductive proximity sensor producing a detectable change in the sensor signal upon detection of a deflection of the portion of the grip cover defining the detection surface sufficient to move the electrically conductive layer to within a detection proximity of the inductive proximity sensor, the detectable change in the sensor signal enabling the door handle to lock or unlock.

An inductive sensor (10) has a substrate (20), on which multiple transmitter/receiver coils (31, 32, 33) are arranged side by side. It can be operated in such a way that the transmitter/receiver coils (31, 32, 33) are each stimulated independently of one another at a frequency of more than 100 MHz.

An electrical system includes a first electrical device, a second electrical device, a redundant electrical transmission path having two electrical connecting lines, connected in parallel, between the two electrical devices, and means for recognizing an error state of the redundant electrical transmission path). The means encompass a magnetic core having a primary conductor including at least half a winding loop, which is formed by one of the two connecting lines, and a secondary winding having a winding count greater than the number of winding loops of the primary conductor, and a diagnostic device for evaluating an inductance-dependent measurement signal of the secondary winding. The diagnostic device is designed to compare the inductance-dependent measurement signals of the secondary winding to a comparison value, in particular an error threshold value, that can be used to distinguish between the error state and a non-error state of the redundant electrical transmission path.

A method of estimating a d-q axis inductance of a permanent magnet synchronous motor includes the following steps. First, building an equivalent motor control block through enabling two of the three phases, and disabling the remaining one of the three phases, and locking a rotor. Afterward, incorporating a back EMF observer into a DC motor control block, and making the DC motor control block correspond to the back EMF observer by commanding an angular speed of the DC motor control block to be zero. Afterward, introducing the equivalent motor control block into the DC motor control block, and using the back EMF observer to estimate the back EMF, and repeating above steps taking turns to disable one phase so as to obtain three sets of motor inductances respectively. Finally, estimating the d-q axis inductance by introducing the three sets of equivalent motor inductances into an inductance relational equation.

A self-checking device and method for an elevator braking device and an elevator system. The self-checking device includes an inductance testing module configured to measure an electromagnetic brake coil inductance L of the braking device; and a processing module electrically connected to the inductance testing module, and storing a mathematical model of an air gap a between the movable plate and the static plate with respect to the brake coil inductance L in a brake state; the processing module is configured to execute a checking mode in the brake state of the braking device, and in the checking mode, the processing module receives a current inductance L.sub.0 measured by the inductance testing module, calculates a current air gap a.sub.0 based on the mathematical model stored, and determines a wear degree of the friction lining based on the current air gap a.sub.0 calculated.

A method can include in a first phase of a sensing operation, controlling at least a first switch to energize a sensor inductance; in a second phase of the sensing operation that follows the first phase, controlling at least a second switch to couple the sensor inductance to a first modulator capacitance to induce a first fly-back current from the sensor inductance, the first fly-back current generating a first modulator voltage at the first modulator capacitance, and in response to the first modulator voltage, controlling at least a third switch to generate a balance current that flows in an opposite direction to the fly-back current at the first modulator node. The first and second phases can be repeated to generate a first modulator voltage at the first modulator capacitance. the modulator voltage can be converted into a digital value representing the sensor inductance. Related devices and systems are also disclosed.

A wireless power transfer system includes a power receiver (105) receiving a power transfer from a power transmitter (101) via a wireless inductive power transfer signal. The power transmitter (101) comprises a transmit power coil (103) generating the power transfer signal. A test signal coil (209) coupled to a test signal generator (211) generates a magnetic test signal. A plurality of spatially distributed detection coils (213) is coupled to measurement unit (215) generating a set of measurement values reflecting signals induced in the detection coils (213) by the magnetic test signal. A processor (217) determines a measurement spatial distribution of the measurement value where the spatial distribution reflects positions of the detection coils (213). A foreign object detector (219) detects a presence of a foreign object in response to a comparison of the measurement spatial distribution to a reference spatial distribution. The foreign object detector (219) is arranged to determine the reference spatial distribution in response to data received from the power receiving device (105).

Foreign object detection for wireless power transmitters and related apparatuses and methods are disclosed. An apparatus includes an analog-to-digital converter to sample at least one of a coil voltage potential and a coil current representation of a transmit coil inductively coupled to a receive coil of a wireless power receiver with a distance between the transmit coil and the receive coil. The apparatus also includes a processing core to determine an expected reference Q-factor value responsive to the at least one of the sampled coil voltage potential and the sampled coil current representation. The expected reference Q-factor value indicates a Q-factor value expected at a predetermined reference wireless power transmitter inductively coupled to the wireless power receiver with a reference distance from a reference transmit coil of the predetermined reference wireless power transmitter to the receive coil of the wireless power receiver.

A door handle assembly for a motor vehicle door includes a handle base configured to be secured to the door, a grip cover coupled to the handle base such that the handle base and the grip cover cooperatively define a door handle grip, a first sensor positioned relative to the handle base and configured to produce a detectable change in a first sensor signal upon detection of one of an object within a detection proximity thereof, the detectable change in the first sensor signal enabling the latch to unlock or unlatch, and a second sensor positioned relative to the grip cover and configured to produce a detectable change in a second sensor signal upon deflection of a portion of the grip cover to within a detection proximity of a sensing surface of the second sensor, the detectable change in the second sensor signal enabling the latch to lock or latch.

A power conversion device includes a semiconductor power converter that converts direct current power into alternating current power for a motor, a common-mode reactor having first and second auxiliary windings added thereto, the common-mode reactor reducing common-mode current that may flow between the semiconductor power converter and the motor, a signal generator that superimposes an alternating current on the first auxiliary winding, and a detection circuit that detects a saturation state of the common-mode reactor on the basis of the superimposed current superimposed on the first auxiliary winding and a winding voltage generated in the second auxiliary winding by the superimposed current.