An active electromagnetic interference (EMI) filter includes a first amplifier and a second amplifier. The first amplifier is configured to sense noise signals on a power conductor. The second amplifier is coupled to the first amplifier and is configured to drive a cancellation signal onto the power conductor. The cancellation signal is to reduce the amplitude of the noise signals sensed by the first amplifier. An output impedance of the second amplifier is lower than an output impedance of the first amplifier.

Various circuit board systems and methods of use and manufacture thereof are disclosed. A circuit board system can have a first circuit board including a substrate and a first component susceptible to electromagnetic interference carried by the substrate. The system can also include a second circuit board including a second substrate, and a shield engaged to the substrate of the first component, the shield at least partially covering the first component and being configured to protect the first component from electromagnetic interference, wherein the shield couples the substrate of the first circuit board to the substrate of the second circuit board.

This disclosure is directed to circuitry for inducing jitter to clock signal of an electronic device to reduce undesired electromagnetic emissions of the electronic device during operation. The electronic device may include a jitter generator to induce the jitter to the clock signal. In some embodiments, the electronic device may also include a multiplexer outputting either of the clock signal or the jittered clock signal for latching the output signals. As such, the output signals may have a baseline margin based on the clock signal while the electronic device may operate using the jittered clock signal. The jittered clock signal may spread the undesired electromagnetic emissions of the electronic device and therefore reduce interference.

An electronic device protection unit is provided. The electronic device protection unit includes a sensing part, a responding part, and an analysis and control part. The sensing part is configured to detect an incident ray which is electromagnetic wave or radiation with potential to cause destruction (damage), failure, or malfunction of an electronic device. The responding part is configured to be able to perform a plurality of behaviors to protect the electronic device. The analysis and control part is configured to control the behaviors of the responding part in response to a type of the incident ray detected by the sensing part.

Various implementations described herein are related to a device having a first coil-shaped spiral structure for an active shield and a second coil-shaped spiral structure that is wound in-between windings of the first coil-shaped spiral structure. The first coil-shaped spiral structure may provide for a coil-based electro-magnetic (EM) shield as a counter-measure circuit for protecting an underlying circuit.

Systems, methods, and devices are described with respect to storing energy in an electric vehicle. At least one coil winding located in a wheel assembly is provided, where the wheel assembly includes a tire and a rim. At least one charge storage device located in the wheel assembly is provided. At least one electrical storage unit located within the electric vehicle is provided, where an induced charge resulting from the at least one winding passing through an electromagnetic field is stored in the at least one charge storage device and transferred to the at least one electrical storage unit via the rim of the wheel assembly. Moreover, a charging capacity for the at least one charge storage device may change to cause the electric vehicle to slow.

Methods, devices, and systems are provided to shield a passenger compartment of an electric vehicle from electromagnetic fields present during a wireless charging process. A charging system may include a power source and a charging plate wirelessly coupled to the power source, where the power source wirelessly transfers power to the charging plate. The system may further include at least one shield portion between the charging plate and a passenger compartment of the electric vehicle, where the at least one shield portion is configured to attenuate an electromagnetic field provided by the charging system.

A method of performing active shielding of an electronic device from a magnetic field having a first flux, using a circuit; having the steps of: measuring, using a Hall effect sensor, a first magnitude and a first direction of the first flux; creating an output voltage equal to the first magnitude; feeding the output voltage to a differential amplifier; amplifying the output voltage to create an amplified output; comparing, using an error amplifier, the amplified output to a reference voltage to determine an error voltage; feeding the error voltage to an electric power switching circuit; generating a switching waveform based on the error voltage; feeding the switching waveform as an input to a driver module; creating, based on the input, a current having amplitude equaling the first magnitude and a second direction opposite of the first direction, such that a second flux is created to cancel the first flux.

A compensation coil placed at least partially underneath a magnetic field sensor package in an electronic system provides attenuation of electromagnetic interference (EMI). In an embodiment, the compensation coil attenuates EMI in a frequency band which overlaps with an operating frequency band of the magnetic field sensor. This allows the magnetic field sensor to make accurate magnetic field measurements in the presence of system level alternating current (AC) EMI. In an embodiment, a system comprises: a magnetic field sensor; a compensation coil placed at least partially underneath the magnetic field sensor; and a reverse current generator coupled to the compensation coil and to a power supply that is coupled to an electromagnetic interference (EMI) source, the reverse current generator operable to generate a reverse current in the compensation coil to generate a counter magnetic field for compensating the EMI.

The disclosure relates to a control device in a motor vehicle. The control device includes a housing cover with a peripheral edge region, and a planar, electrical connecting apparatus with integrated conductor tracks. The housing cover, in the edge region, is cohesively connected at least to the connecting apparatus and forms a cavity with the connecting apparatus. The control device also includes at least one electronic component within the cavity. The connecting apparatus electrically connects the at least one electronic component to electronic components outside the cavity. The housing cover is encapsulated by injection molding in a media-tight manner by a polymer beyond the peripheral edge region.