36 results about "Resonance tuning" patented technology

An implantable medical assist device includes a medical device. The medical device has a housing and electronics contained therein. A lead provides an electrical path to or from the electronics within the medical device. A resonance tuning module is located in the housing and is connected to the lead. The resonance tuning module includes a control circuit for determining a resonant frequency of the implantable medical assist device and an adjustable impedance circuit to change the combined resonant frequency of the medical device and lead.

Provided are systems and methods for resonance tuning. A signal is received in response to a resonance of a structure. A frequency or musical note related to an overtone is determined from the signal. The frequency or musical note related to the overtone is selected as a filter mode reference frequency or musical note. A display of frequencies or musical notes from a subsequent signal that deviate from the filter mode reference frequency or musical note by a predetermined threshold is suppressed.

A MEMS resonant torque sensor used for linear micro-nano material torsion performance measurement comprises a monocrystalline silicon substrate, a silicon dioxide insulating layer and a monocrystalline silicon structure layer. The monocrystalline silicon structure layer comprises two ''Z''-shaped micro-amplification beams. Lever beam tops are connected to an input beam. Lever beam bottoms are connected to one end of an output beam. Lower middle parts of the lever beams are connected to a fifth anchor point between the two lever beams through a fulcrum beam. The input beam is fixed to a fourth anchor point through a connection beam. Keys which are connected and are located between the two opposite input beams are installed with a linear micro-nano material to be measured. The other end of the output beam is connected to a double-end fixed resonance tuning fork. The double-end fixed resonance tuning fork is connected to a third anchor point. A plate capacitor group of the double-end fixed resonance tuning fork is fixed to first and second anchor points. The structures, except for the anchor points, are in a suspending state. Through metal electrode plates sputtered on the first, second and third anchor points, the whole sensor is placed in a self-excited oscillation circuit. The size of the sensor is small, sensitivity is high and a measured range is large.

Provided is a self-resonance tuning piezoelectric energy harvester. The self-resonance tuning piezoelectric energy harvester includes a piezoelectric beam which extends along a horizontal direction, a fixing element which fixes two ends of the piezoelectric beam, and a mass which is connected to the piezoelectric beam movably along the piezoelectric beam, wherein the mass includes a through-hole through which the piezoelectric beam passes, and makes the movement through the through-hole. According to the principle of continuous movement to the resonance position, the mass of the self-resonance tuning piezoelectric energy harvester induces the piezoelectric beam to generate displacement to the maximum and maximize the electricity production capacity of the piezoelectric energy harvester.

A brushhead assembly (10) for a power toothbrush (1), which includes a bristle plate (12) and a set of bristles (14) mounted to the bristle plate (12). The set of bristles (14) is characterized such that some or all of the bristles have a dipole whip motion during operation at a selected drive frequency, including arrangements where the bristles in a first portion (32) have a different motion than the bristles at a at least a second portion (34) of the brushhead assembly (10).

The invention discloses a wireless energy transmission system based on a magnetic resonance array, belonging to the wireless energy transmission field. A primary part in the system consists of a main power converter, a primary resonance capacitor, a primary magnetic induction coil and a primary magnetic resonance array. A secondary part consists of a secondary magnetic induction coil, a secondary resonance capacitor, a power controller and a secondary magnetic resonance array. Each one of the primary magnetic resonance array and a secondary magnetic resonance array consists of a plurality of magnetic resonance units; each magnetic resonance unit comprises a magnetic resonance coil and a resonance tuning capacitor; and the head ends and the tail ends of the magnetic resonance coils are respectively connected with both ends of the resonance tuning capacitors. In the wireless energy transmission system provided by the invention, the difficulty of an excitation frequency on selection is greatly reduced, the problem that the magnetic resonance coils are difficult to tune is solved, and the flexibility of the system utilization is improved.

The invention discloses a resonant circuit based on a chip, which relates to the technical field of resonant tuning, including: a square wave generating module, a resonant module, a voltage and current sampling module, a phase difference detection module, a main control module, a driving module, a phase control module, an output Processing module; the square wave generation module is used to generate square wave signals, the resonance module is used to generate voltage division signals, the voltage and current sampling module is used to sample voltage and current signals, and the phase difference detection module is used to detect voltage and current phase differences, the main control The module is used for receiving and processing signals and outputting driving signals, the driving module is used for outputting driving signals, and the phase control module is used for controlling phase shifting. The chip-based resonant circuit of the present invention uses a microcontroller to realize phase-shift control of the inductor current through the control of the fully-controlled device, thereby performing dynamic real-time tuning control on the resonant circuit, and also uses Hall current sensors, operational amplifiers and logic The chip improves the detection accuracy of voltage and current phase difference.

A complex impedance matching circular polarization filter antenna includes two dielectric substrates and three metal layers, and the space between the two substrates is filled with air. The antenna radiating unit is located on the top layer of the first dielectric substrate and is a circular metal patch with notches. The ground metal layer is located on the upper layer of the second-layer substrate and is etched with an asymmetrical U-shaped groove. The filter feeding structure is located on the bottom layer of the second-layer substrate, and a hairpin microstrip resonator is connected to the terminal of the microstrip line. In the present invention, by adjusting the size of the U-shaped microstrip line resonator and the coupling slit, the quality factor and the coupling coefficient in the coupling matrix are tuned, and the complex impedance matching of the antenna can be realized; through the U-shaped microstrip line resonator and the circular SMD resonance tuning expands the working bandwidth of the antenna and realizes second harmonic suppression at the same time. The invention can ensure the second harmonic suppression and complex impedance matching while realizing the broadband operation of the antenna.

The invention aims at providing a resonance tuning type large-output-force electromagnetic active actuator which comprises an outer barrel, an end cover and a permanent magnet, a magnetic yoke, a center shaft, a coil, a coil rack, a shaft sleeve, a cushion plate and a sliding system installed in the outer barrel, wherein the sliding system comprises a spring, a positioning mechanism, pulleys, nuts and knobs, one end of the spring is fixed on the cushion plate, and the other end is installed on the positioning mechanism; the quantity of the pulleys is two, the positioning mechanism penetrates through the two pulleys so that the pulleys rotate around the passing shaft and the relative position of the two pulleys is unchanged, and each pulley is connected with the nut and the knob; the nuts and the knobs are located outside the outer barrel, and the pulleys are located inside the outer barrel; and a sliding way for the sliding system to move is arranged on the outer barrel. The resonance tuning type large-output-force electromagnetic active actuator has compact structure, large output force, high sensitivity and wide applicable frequency band.