54 results about "Self resonance" patented technology

A method and apparatus for fully integrating a Voltage Controlled Oscillator (VCO) on an integrated circuit. The VCO is implemented using a differential-mode circuit design. The differential-mode implementation of the VCO preferably comprises a differential mode LC-resonator circuit, a digital capacitor, a differential pair amplifier, and a current source. The LC-resonator circuit includes at least one tuning varactor and two high Q inductors. The tuning varactor preferably has a wide tuning capacitance range. The tuning varactor is only used to "fine-tune" the center output frequency f0 of the VCO. The center output frequency f0 is coarsely tuned by the digital capacitor. The VCO high Q inductors comprise high gain, high self-resonance, and low loss IC inductors. The IC VCO is fabricated on a high resistivity substrate material using a trench isolated guard ring. The guard ring isolates the fully integrated VCO, and each of its component parts, from RF signals that may be introduced into the IC substrate by other devices. By virtue of the improved performance characteristics provided by the digital capacitor, the analog tuning varactor, the high Q inductor, and the trench isolated guard ring techniques, the inventive VCO is fully integrated despite process variations in IC fabrication.

An array of induction magnetometers for use in airborne transient electromagnetic (ATEM) geophysical exploration is disclosed, having similar weight and external dimensions of prior art induction magnetometers but with improved signal strength, signal-to-noise ratio, higher frequency, self-resonance and bandwidth, and providing accurate and well monitored calibration.

This invention pertains to the control of high voltage power, and in particular to control of high voltage power from low voltage sources while reducing unwanted self resonance in the windings of a self oscillating flyback converter.

An NMR probe comprising an RF resonator 48 serves in a first mode for conventional sensitivity optimized studies of abundant samples at frequency ω₀, and in a second mode for independent sensitivity optimized studies of micro sample quantities at frequency ω₀ through use of a removably insertable self-resonant micro-coil 50 within the RF resonator 48 and closely surrounding a micro sample, that is preferably independently removably insertable within the micro-coil. The NMR probe exhibits an enhanced tuning range to resonate in its first mode and in the second mode to inductively couple to the self-resonant micro-coil 50 to induce self-resonance of the micro-coil 50 at ω₀.

An edge crack monitoring system for an integrated circuit provided on a die, comprises a conductive trace comprising at least a first conductive path for allowing current in a first direction, and a second adjacent conductive path for allowing current in a second direction opposite to the first direction. Both adjacent conductive paths form at least one loop surrounding a semiconductor device on a die. The arrangement of the trace is adapted to provide compensation of EM interferences. The trace comprises two terminals being connectable to a detection circuit for detecting damages by generating a fault signal upon detection of disruption of the conductive trace due to a damage. The conductive trace comprises high resistance portions with a resistance of at least 1 kΩ, adapted for reducing self-resonance.

The invention discloses an online diesel exhaust fluid solution concentration monitoring system for an automobile SCR (Selective Catalytic Reducer) system. The online diesel exhaust fluid solution concentration monitoring system comprises a power module, a coil design module and a data acquiring and processing module, which are sequentially connected through SMA (SubMiniature version A) connectors, wherein the coil design module comprises a transmitting coil, a urea tank and a receiving coil; the urea tank is used for being filled with a urea solution; the transmitting coil and the receiving coil are arranged at the outer side of the urea tank; the transmitting coil is connected with the power module through the SMA connector; the receiving coil is connected with the data acquiring and processing module through the SMA connector. The online diesel exhaust fluid solution concentration monitoring system avoids the contact between the measuring coil and the urea solution, adopts a self-resonance mode of the coil, and improves the sensitivity of the voltage at the two ends of the coil on change of concentration of the urea solution. The invention further discloses a monitoring method of the online diesel exhaust fluid solution concentration monitoring system for the automobile SCR system.

A loading of a twisted folded monopole (LTFM) includes a first antenna portion and a second antenna portion. The first and second antenna portions are mutually coupled to support a lower band for wireless communications. The LTFM also includes a third antenna portion and a fourth antenna portion. The third and fourth antenna portions generate self resonance in a higher band for wireless communications.

The invention provides a noncontact testing method for inherent frequency and quality factor of a resonance coil, relates to a measurement technology of the inherent frequency and quality factor of a self-resonance coil adopting own distributed capacitance in a magnetic coupling resonant antenna electricity energy transmission system, and aims at solving the problem that introduced error and large impendence lead to accurate measurement result during measuring the inherent frequency and the quality factor of the resonance coil by the direct measuring method. The method comprises the steps of activating a coil to be measured through a primary magnetic field generated by a small standard coil to obtain impedance parameters; calculating the impedance characteristics of the standard coil and comparing with the impedance characteristics under the condition that the coil to be measured is not added so as to obtain the impedance information of the coil to be measured; measuring and calculating the inherent frequency f0 and the quality factor of the self-resonance coil. The method has the characteristics of being small in error, high in measurement precision, and convenient to measure; the accuracy is increased by at least 20% by being compared with that of the direct measuring method.

The invention provides magnetic coupling resonance wireless power transmitting equipment and a magnetic coupling resonance wireless power transmitting method. The equipment comprises an LC resonance network with a transmitting coil, a power supply and a self-resonance control circuit, wherein the power supply is connected with the LC resonance network at a transmitting end, and charges the LC resonance network at the transmitting end; the self-resonance control circuit monitors the charging process; after the charging is finished, the self-resonance control circuit controls to cut off the power of the power supply; the LC resonance network performs self-resonance oscillating at a natural frequency and transmits the energy out in the form of an electromagnetic wave through a resonance coil in the LC resonance network at the transmitting end; when the self-resonance control circuit detects that the energy of the LC resonance network at the transmitting end is lower than a preset threshold value during a self-resonance oscillating process, the self-resonance control circuit closes the power supply; the power supply starts to charge the LC resonance network at the transmitting end. Through the equipment and the method, self-resonance intermittent wireless power transmitting can be realized without the help of external excitation.

The invention discloses a state detection device applied to a mobile terminal and a mobile terminal, a technical effect of performing detection on the service state of the mobile terminal is realized, and the mobile terminal is enabled to improve a waterproof protection effect and an antenna switching effect based on a service state detection result when designing functions such as waterproof protection and antenna switching. The state detection device is characterized in that a primary antenna radiator is excited by a primary antenna signal source to realize self resonance and radiation in a set frequency band, and a metal secondary antenna radiator is enabled to be excited by the primary antenna radiator to generate secondary radiation in the set frequency band; a secondary antenna radiation signal coupler acquires an antenna signal radiated by the metal secondary antenna radiator, a signal receiver receives the antenna signal and judges whether the radiation frequency thereof is the radiation frequency of the set frequency band or not; and an antenna state detection module generates a state detection result of the mobile terminal according to a judgment result of the signal receiver. Operations such as waterproof protection and antenna switching can be executed according to state variations after the state of the mobile terminal is acquired.

The invention discloses an all-metal-ring narrow-frame 4G smart phone antenna. The smart phone antenna comprises a PCB and a system floor; a metal ring is wound around the periphery of the PCB; a gap is formed between the metal ring and the PCB; a feed port used for dividing the metal ring into two annular antennas is formed in the metal ring; the base modes and higher order modes of the two annular antennas jointly cover six frequency bands; the smart phone antenna also comprises a grounding metal sheet and a matching circuit which is formed by a capacitive element and an inductive element connected in parallel; the matching circuit is arranged between the grounding metal sheet and the system floor; the metal ring and the matching circuit jointly form a radiation unit of the antenna; and the self resonance of the capacitive element and the inductive element influences the input impedance value of the dual annular antennas in a low frequency, so that the resonant points at the low frequency band are increased. By adoption of the structure, when the antenna is applied to all-metal-ring surrounding, the metal structure is not damaged while seven-frequency-band 4G coverage can be realized; and meanwhile, the smart phone antenna is more in frequency bands, high in radiation efficiency, narrow in frame, and maintains completeness of the metal ring without damage, so that the smart phone antenna is quite suitable for the modern mobile phone.

In a configuration of an isolation circuit using a transformer of a high-frequency-isolation gate driver circuit in the frequency band from 1 to 100 MHz, a period for resetting the exciting current is eliminated, generation of self-resonance phenomenon after resetting is cancelled to reduce generation of noise current, and malfunctions of the switching element due to noise is prevented. In driving plural gate circuits by RF signals, exciting current is allowed to pass through a primary coil of a gate driver transformer alternately in both directions continuously all the time, in a configuration for isolating drive input signals by the gate driver transformer. Accordingly, the reset period that is required when the exciting current flows only in one way becomes unnecessary, and thus generation of self-resonance phenomenon after resetting is canceled. Then, generation of noise current caused by the self-resonance phenomenon is reduced.

A multilayered, low temperature co-fired ceramic (LTCC) substrate within which one or more capacitors are formed (e.g., for power supply decoupling). Self-resonance is introduced by the capacitance of each capacitor interacting with an inductance formed by the interconnects (e.g., conductive vias and other conductive interconnects among the electrode patterns), which couple such capacitor to its respective circuit electrode and interface electrode (e.g., ground reference).

The invention provides a magnetic resonance type wireless energy supply method and device for a capsule diagnosis system. The invention is typically characterized in that: the aim of efficiently supplying energy to the capsule diagnosis system is fulfilled by using a magnetic field resonance technique. The complete set of device consists of an in-vitro part and an in-vivo part, wherein the in-vitro part mainly comprises a communication circuit, a control circuit, a driving circuit, an exciting coil, a self-resonance transmitting coil and the like; and the in-vivo part mainly comprises a three-dimensional self-resonance receiving coil, a three-dimensional energy output coil, a rectifying and filtering circuit, a load, a sampling circuit, an analog-to-digital conversion circuit, a communication circuit and the like. The device has the advantages of high energy converting efficiency, safety for human bodies and convenience of using.

The invention relates to a carbon nano-tube ionization self-resonance type gas sensitive sensor, which comprises a carbon nano-tube electrode, an aluminum plate electrode and an insulating film, wherein the insulating film covers the carbon nano-tube electrode, and is provided with a row of concave grooves corresponding to polar contributions of difference gases, the aluminum plate electrode covers the insulating film, and a bias voltage generation device is connected between the carbon nano-tube electrode and the aluminum plate electrode. The gas sensitive sensor further comprises a noise generation device for producing noises with multiple stochastic resonance strengths and a gas recognition module for real-timely recording voltage-current detection data after inducing multiple stochastic resonances and carrying out pattern recognition classification on the detection data to achieve gas type detection. The carbon nano-tube ionization self-resonance type gas sensitive sensor has characteristics of rapid response, more gas detection varieties and high repeatability, is not easily affected by a temperature, an air pressure and other environmental factors, and is suitable for field use.

The invention discloses a low-electric-field emission end coil for wireless charging. The low-electric-field emission end coil for wireless charging introduces tuning capacitors between single coil bodies of a common emission end coil, wherein the tuning capacitors are used for reducing adverse effects of parasitic capacitance of the tuning capacitors and reducing radiation interference of EMI and RF interference (RFI); the capacitance of the tuning capacitors makes the single coil bodies generate self resonance, avoids accumulation of alternating-current voltage between turn numbers of adjacent coils and makes a simultaneous minimum electric field of the near-field magnetic field effect generated. The low-electric-field coil is provided for resonant wireless charging product series, and has the advantages of being smaller in electric field interference, and capable of passing the FCC EMI certification more easily and providing a stable coil for large-area 1:N charging application.

The invention discloses a self-adaptive quasi-PR active damping low-frequency harmonic suppression method, and the method comprises the steps: introducing a self-adaptive quasi-PR control link on the basis of conventional double-closed-loop control, introducing a phase compensation structure on the basis of quasi-PR control, and adding a voltage proportion feedforward link at a PCC grid-connected point, thereby obtaining the self-adaptive quasi-PR active damping low-frequency harmonic suppression method. According to the method, zero-static-error tracking of grid-connected current to sine given current is achieved, the content of third, fifth and seventh harmonics in the grid-connected current is reduced, active damping of the system is increased, the capacity of the system for resisting power grid voltage disturbance is improved, meanwhile, main low-frequency resonance existing in an inverter in the grid-connected cluster system is equivalently converted and offset, and therefore the grid-connected cluster system is optimized. Self resonance and parallel resonance of the LCL photovoltaic grid-connected inverter are effectively inhibited; multi-point low-frequency resonance suppression of the multi-inverter grid-connected system is achieved, passive damping control can be replaced, the hardware cost and power consumption are effectively reduced, and the stability of the grid-connected system is remarkably improved.