84 results about "RLC circuit" patented technology

Model-order reduction techniques are described for RLC circuits modeling the VLSI layouts. A structured model order reduction is developed to preserve the block-level sparsity, hierarchy and latency. In addition, a structured and parameterized model order reduction is developed to generate macromodels for design optimizations of VLSI layouts. The applications are thermal via allocation under the dynamic thermal integrity and via stapling to simultaneously optimize thermal and power integrity.

A compact, neck massager configured as a collar-type device adapted to be worn about a persons neck and adapted for providing the most effective natural relaxation therapies, namely gentle vibration and soothing heat to the neck and spine is disclosed. The device generally comprises a collar sculpted to fit comfortably around the neck and secured by flexible straps with connectable ends to facilitate removable attachment of the device around the user's neck. The collar includes a housing containing an electric motor powered alternatively by a battery or AC power source. The electric motor is adapted with an output shaft having an eccentric mass for converting rotational movement of a motor into a vibration movement for transmission to the cervical area through the housing. The device further includes a heating band disposed on the inner surface thereof for selectively transmitting heat to the cervical area. A control circuit is provided to enable the user to selectively vary the power supplied between the electric motor and heating element thereby varying the transmission of therapeutic vibration and heat to the neck. The electrical components are configured to function as an RLC circuit such that system oscillates between heat and vibration thereby maximizing therapeutic benefits.

A calibration system is provided for calibrating frequency domain reflectometers in the field by using both the scattering parameters of the multi-port junction determined at the factory and changing the offset and gain terms used in generating a complex reflection coefficient by using internal calibrated loads so that heavy, cumbersome external calibrated transmission lines are not required. In one embodiment the internal calibrated loads include RLC circuits and in another embodiment the internal calibrated loads include attenuators. Further, retesting or recalibration does not necessitate reconnecting the cable under test, which may remain connected to the reflectometer's test port throughout the procedure.

A transponder has a resonant RLC circuit with one or more electromagnetic energy storage components that vary in response to an externally applied modulating energy field. In addition to the externally modulating energy field, a base station transmits a carrier signal with a frequency essentially the same as the quiescent resonant frequency of the RLC circuit. As the component(s) vary, the resonant frequency of the RLC circuit changes, modulating the carrier signal with the external modulating energy field. Effects of the modulation are detected by the base station. Information (e.g., the presence of a tag) is obtained by receiving and demodulating the modulated signal at the base station. One or more or the circuit elements (e.g, different preferred embodiments of one or more capacitors, inductors, and resistors) can be varied (e.g. mechanically) to modulate the carrier signal. This allows the resonant circuit to modulate the carrier signal with multiple modulation frequencies to encode multiple bits of information on the carrier.

A calibration system is provided for calibrating frequency domain reflectometers in the field by using both the scattering parameters of the multi-port junction determined at the factory and changing the offset and gain terms used in generating a complex reflection coefficient by using internal calibrated loads so that heavy, cumbersome external calibrated transmission lines are not required. In one embodiment the internal calibrated loads include RLC circuits and in another embodiment the internal calibrated loads include attenuators. Further, retesting or recalibration does not necessitate reconnecting the cable under test, which may remain connected to the reflectometer's test port throughout the procedure.

A shortened multi-band antenna includes in-line dipoles, selected elements of which having shielded meanderline chokes to be able to switch from an extended dipole at the lower VHF frequencies to a shortened dipole for the UHF band. Additionally, the staggered asymmetric meanderline configuration permits overall size reduction, whereas antenna construction includes an intermediate fiberglass layer over which conductive foil is placed for tuning and for parasitic radiator purposes to improve the gain of the UHF dipole in the upper regions of the band at 450 megahertz. Additionally, at the low end of the 30 megahertz band a sleeve is positioned between the base of the lowest dipole element and ground, with the sleeve provided with two parallel RLC circuits tuned to different bands to improve VSWR at the low end of the VHF band and to eliminate unwanted nulls.

The method belongs to the routing design area in VLSI physical design. The characters of the method of using computers to solve the set of linear equations are as follows. Based on the features of that the power wire / ground, wire network of the application specific integrated circuit (ASIC) contains a great lot of the chain topology, the parameters R, L, C and the current source in the RLC circuit are equivalent to the nodes at the two ends of the chain. The set of linear equations is listed for the equivalent circuits composed of the nodes at the two ends of all chains. Then, the magnitudes of voltage of the mergered nodes in all chains are determined. The method has the advantages of fast and saving the memory. The scale of the chips to be treated is posible to be enlarged and the precision meets the demand.

A conductivity counter and method of determining conductivity of a fluid sample are disclosed. The counter is suitable for high-speed, accurate counting of discrete events or items, such as cancer cells, passing through a fluid sample cell. A variable frequency current source is used to supply an excitation current to a sample cell connected in parallel with an inductance or the electrical equivalence of an inductance. This configuration can be accurately modeled as a parallel RLC circuit when the system is operated at a stable frequency. The current source frequency is tuned to the resonance frequency of the equivalent RLC circuit, which effectively eliminates the capacitive and inductive components of the impedance, leaving only purely resistive components. The output of the equivalent RLC circuit is connected to a high input impedance buffer amplifier and then to a phase sensitive detector, which detects the phase shift resulting from the equivalent RLC circuit. The output is filtered and a differencing amplifier is used to zero out the output signal due to the system components and the sample cell buffer solution prior to taking active readings. The remaining output signal is due to perturbations in the fluid sample, such as passing cancer cells. This output is sent to a high-gain output amplifier and then supplied to a suitable signal processing device or system, such as a computer.

The invention provides a quantitative analysis method for the subsynchronous oscillation stability of a wind turbine generator grid-connected system. The quantitative analysis method comprises the following steps: adding positive and negative sequence voltage disturbance signals to a wind turbine generator grid-connected point; establishing transfer functions of a wind turbine generator phase-locked loop, a current adjusting link and a PWM modulation link; obtaining positive and negative sequence impedance models Zp (s) and Zn (s) of a wind turbine generator, an equivalent impedance model Zg (s) of a power grid and a total impedance model Z (s) of a grid-connected system; determining proper fitting fractal polynomial orders m and n, and fitting the total impedance model Z (s) of the grid-connected system by using the fitting fractal polynomial orders m and n; solving a zero point of the fitting fractal polynomial in a fitting interval according to a fitting result, and determining theoscillation frequency and the damping level of the system according to the solved zero point. According to the invention, the method provided by the invention is provided based on the sequential impedance model in a static coordinate system. The method solves the problem that the traditional Nyquist stability criterion based on a sequential impedance model cannot quantitatively obtain the oscillation frequency and the damping level of the system in the prior art. The problem that the quantitative analysis method based on an aggregation RLC circuit model is narrow in application range is also solved.

A soil moisture sensor includes a capacitive probe configured to be inserted into soil, a series RLC circuit electrically coupled to the capacitive probe, a microcontroller configured to determine the capacitance value of the soil and determine the moisture content of the soil from the capacitance value of the soil.

A shortened multi-band antenna includes in-line dipoles, selected elements of which having shielded meanderline chokes to be able to switch from an extended dipole at the lower VHF frequencies to a shortened dipole for the UHF band. Additionally, the staggered asymmetric meanderline configuration permits overall size reduction, whereas antenna construction includes an intermediate fiberglass layer over which conductive foil is placed for tuning and for parasitic radiator purposes to improve the gain of the UHF dipole in the upper regions of the band at 450 megahertz. Additionally, at the low end of the 30 megahertz band a sleeve is positioned between the base of the lowest dipole element and ground, with the sleeve provided with two parallel RLC circuits tuned to different bands to improve VSWR at the low end of the VHF band and to eliminate unwanted nulls.

The invention relates an electrostatic speaker system comprising—a high voltage switching power amplifier,—an extraction filter having an input coupled to an output of the high voltage switching amplifier, and—an electrostatic speaker element having a capacitive load and an input coupled to an output of the extraction filter. The combination of the extraction filter and capacitive load form a filter circuitry having at least a first filter stage and a second filter stage. The first filter stage comprising a RLC circuit having a resonant frequency ωO and a quality factor Q>½ and wherein the second filter stage being a low pass filter comprises at least one electrical element for damping a signal component at the resonant frequency of the RLC circuit at the output of the extraction filter.

Disclosed is an analysis methodology and equivalent RLC circuits that accurately model the effects of packaging circuitry, bond wire circuitry and other sources of cross talk within an integrated-circuit signal transmission system.

The invention provides a printing system, a printing method and a method for printing a thin film transistor and an RLC circuit; wherein, the system comprises a sample station, one or more printing heads, printing driving device driving the sprouting hole of the printing head to perform the printing operation and a positioning driving device driving the printing head or sample station to perform the printing and positioning; a sprouting hole plate is arranged on each printing head and the sprouting holes of different apertures are arranged on one or more printing heads. The sprouting hole with suitable aperture can be selected for the system according to the liquid of different natures, so as to realize the reliable printing.

The invention provides an equivalent circuit structure and parameter measurement method and apparatus of a passive device. A wideband signal with an adjustable parameter is sent to obtain a complete frequency response of a to-be-measured passive device; and a high-order channel characteristic expression (ARMA zero-pole model) is used for approaching the frequency response. Factorization or residue decomposition is carried out to decompose the high-order channel characteristic expression into a plurality of one-order and two-order minor product or sum forms and each minor corresponds to one low-order RLC circuit. And then the to-be-measured passive device is equivalent to a series / parallel model of a plurality of one-order and two-order RLC circuits and impedance values of all resistor, inductor and capacitor elements are obtained. Besides, the apparatus comprises a human-machine interaction module, a data processing unit, a D / A converter, an A / D converter, a test circuit, a clamp fixture, and a power supply. According to the apparatus, the circuit structure is simple; and a high-order equivalent circuit of a to-be-measured passive device can be provided with high precision.

The present invention discloses an convergence RLC circuit model-based method for analyzing subsynchronous resonance in a power system. The method comprises the following steps of: establishing a power plant model and a series compensated transmission line system model so as to acquire a non-linear differential equation model of each subsystem; generating a state equation model according to a parameter under a particular working condition and the non-linear differential equation model; generating an algebraic equation model according to the Laplace transform and the state equation model; acquiring a final equivalent resistance model so as to acquire a series resonance point; aggregating the final equivalent resistance model into an equivalent second order RLC electric circuit model according to the series resonance point; and quantifying SSR analysis. According to the analysis method provided by an embodiment of the present invention, the final equivalent resistance model is aggregated into the equivalent second order RLC electric circuit model, so that the SSR analysis is quantified, thus implementing the accurate quantification evaluation of SSR, reducing analysis errors and improving analysis accuracy.

A novel and useful degauss circuit for use with electromagnetic door locks. The door lock circuit is configured to provide a constant current to the electromagnetic coil load. A pulse width modulation (PWM) controller varies the frequency and / or duty cycle to a switch in series with the coil. Coil current feedback is used to adjust the PWM frequency and / or duty cycle so as to maintain the current through the coil at a certain level to maintain a desired holding force on the door lock. A degauss circuit inline with the current flowing through the coil is provided. When triggered either in an uncontrolled or controlled manner, a series RLC circuit that includes the coil inductance and resistance causes ringing to occur whereby the coil current reverses direction with sufficient amplitude and duration to degauss the coil.

An apparatus for determining the volume of liquid in a probe tip of an aspirating or dispensing probe, such as those used in a diagnostic analyzer, includes: two electrodes on opposite sides of the probe tip and the electrodes and liquid form a variable capacitor; a resistor; a voltage source and the electrodes and resistor are in electrical communication in at least one of series, parallel or series and parallel to form an RC circuit; and a microprocessor in electrical communication with the RC circuit for converting an electrical signal to a volume of liquid in the probe tip. In a preferred embodiment, the probe tip is separate from the probe and is adapted to be fitted on the end of a probe for aspirating and dispensing a liquid. In another preferred embodiment, the apparatus further includes a solenoid, and the voltage source, electrodes, resistor, and solenoid are in electrical communication in at least one of series, parallel or series and parallel to form an RLC circuit, and the microprocessor is in electrical communication with the RLC circuit for converting an electrical signal to a volume of liquid in the probe tip. The apparatus can be used with a liquid have a known or unknown dielectric constant and can be used to determine the presence of bubbles in the liquid.

The present application relates to a rotor of a compressor or axial turbomachine comprising a vibration-damping system equipped with piezoelectric transducers distributed circularly and connected to dissipative resonant electric circuits. The circuits are closed and are equipped with a resistor and a coil. The piezoelectric transducers are divided into two sets of alternated transducers, each set being connected to a passive RLC circuit. In order to ensure a pooling of capacitances and currents thereof, the piezoelectric transducers are connected in parallel. During operation, the rotor is subjected to a turning excitation and is likely to vibrate and to deform in accordance with a modal shape with diameters with orthogonal deformation waves. The number of transducers is equal to the quadruple of the number of diameters of the mode, so as to be able to utilize the symmetrical character of this mode with diameters. The grouping of the piezoelectric transducers that deform in the same way makes it possible to damp the piezoelectric transducers with identical means thus pooled.

An RLC module is configured to provide a simplified circuit modeling of a selected circuit net (or portion) of an electronic circuit. The RLC module may be configured to substitute an RLC circuit model for the selected circuit net, where the effective values of the capacitance and inductance for the RLC circuit model are retrieved from a table of capacitance and inductance values. A set of interconnect geometry factors (e.g., line length, line width, driver / receiver length, etc.) that describes the circuit net is used as an index into the table of capacitance and inductance values. The retrieved values of the effective capacitance and inductances values may be used to calculate a delay for the RLC circuit model. The RLC module may provide the capability to quickly calculate a delay for a selected circuit net without using computationally intensive calculations for inductance and capacitance values of circuit nets.

The embodiment of the invention discloses a radio-frequency measurement device with a variable attenuator, wherein the measurement device includes an automatic level control circuit with the variable attenuator. Output signals of the automatic level control circuit control the variable attenuator to perform attenuation. The variable attenuator includes a diode group and a low-frequency matching section. The diode group includes at least two diodes which are serially connected in the same direction. A positive-direction end of the diode group is connected with an output end of the variable attenuator and a negative-direction end of the diode group is connected with an input end of the variable attenuator. One end of the low-frequency matching section is arranged between the two diodes and other end is grounded. The low-frequency matching section is an RLC circuit which includes a resistor, an inductor and a capacitor, which are serially connected. The radio-frequency measurement device with the variable attenuator realizes broadband continuous attenuation so that attenuation amount is increased significantly and the device has a characteristic that the control circuit is significantly simple.

A noise suppression circuit for a power adapter is disclosed. The noise suppression circuit can reduce or eliminate adapter-induced noise that could interfere with an electronic device powered by the adapter. In one example, the noise suppression circuit can include an active circuit to detect and attenuate or cancel the induced noise. In another example, the noise suppression circuit can include an RLC circuit in parallel with the adapter choke to suppress the induced noise at the operating frequencies of the powered electronic device. In still another example, the noise suppression circuit can include a modified adapter Y capacitor connection so as to bypass the adapter choke, thereby reducing or eliminating the choke's induced noise.

An oscillator provides a reference signal having a phase. A tunable reactive circuit, including an induction coil, is driven by the fixed frequency reference signal of the oscillator with coil adapted to be positioned adjacent the specimen to generate an oscillating signal corresponding to the condition of the specimen. The tunable reactive circuit provides an output signal having a parameter indicative of the condition of the specimen. A resonant control circuit compares the reference signal to the oscillating signal and provides to the tunable reactive circuit a resonance control signal representative of the comparison. The resonance control signal tunes the tunable reactive circuit, which may be a series RLC circuit, so that the frequency of the oscillating signal is substantially constant.

A system for detecting spark in an igniter for a gas turbine engine. An igniter generates a plasma, or spark, somewhat similar to an automotive spark plug. In the invention, an inductive pick-up is positioned adjacent the igniter, to detect current pulses in the igniter, to thereby infer the presence of spark. The signal produced is small, and requires amplification. However, the environment is hot, often exceeding 400 degrees F. The invention utilizes an amplifier composed of passive components, in the form of an RLC circuit.

The invention relates to a method for judging harmonic stability of a high-voltage direct-current power transmission system. The method for judging the harmonic stability of the high-voltage direct-current power transmission system comprises the following steps of (1) obtaining an H matrix of a converter equivalent two-port network; (2) using a switch function to deduce an H matrix parameter expression; (3) using the H matrix to enable the high-voltage direct-current power transmission system connected with a converter to be equivalent to a simple RLC circuit, and obtaining a harmonic attenuation factor Re(Zcondc+Zdch), wherein, if the Re(Zcondc+Zdch) is smaller than or equal to zero, it is determined that harmonic waves are unstable, if the Re(Zcondc+Zdch) is equal to zero, it is determined that the high-voltage direct-current power transmission system is in a critical unstable state, and if the Re(Zcondc+Zdch) is larger than zero, it is determined that the high-voltage direct-current power transmission system is stable. According to the method for judging the harmonic stability of the high-voltage direct-current power transmission system, the conception is clear and the judgment method is easy and effective in the judgment process, the phenomenon that the high-voltage direct-current power transmission system is unstable can be effectively prevented from occurring by modifying related device parameters in the design stage of HVDC.

The invention discloses a battery capacity on-line measuring system and measuring method based on damped oscillation. An inductor, a capacitor and an equivalent internal resistor of a battery to be measured are utilized to form an RLC oscillating circuit; a control processor controls the connection and disconnection of a switch tube to enable the inductor to be charged and discharged, and a damped oscillation waveform is generated in the RLC circuit; the waveform is collected by a differential amplification circuit, and after the signal is processed through an AD conversion module, attenuation coefficient thereof is calculated by the control processor; and since the attenuation coefficient is associated with the inductor and the equivalent internal resistor, and precise value of the inductor can be measured online, and the internal resistance can be calculated. Through the system, a comparison table between the battery internal resistance and residual capacity can be obtained in advance; and by comparing the measured battery internal resistance with the known table, the battery capacity can be obtained, and the final result is output through a display module. The detection circuit adopted in the invention is simple in structure; the battery is lossless in the measuring process; and the system and method are convenient and safe to use.

The inveniton is an transient analysis and solution method of IC power supply network based on a multilayer equivalent circuit model, containing a transient analysis method of power line / wire network based on DC analysis, and its character: it is a fast method: in accordance with the character of IC power line / wire network having a regular mesh structure, according to the basic idea of a multi-mesh method, it makes parameters R, L and C of the medium node RLC circuit in a circuit network and current source approximately equivalent to angular nodes of the circuit network, on the current level forms a crude circuit network layer composed of angular nodes only, makes the above operation layer by layer to form the final crude circuit network, then writes a linear equation group, utilizes the existing method to fast find voltage values of all the nodes of the equivalent circuit at the moment, and then by this, layer by layer restores and finds voltage values of all the combined nodes at the moment.

The present invention provides a method for detecting the anti-island protection performance of an inverter. An RLC circuit is serially connected between the inverter and a grid connection switch, the resonant frequency of the RLC load is set as three different numerical values for enabling the same to present resistance, capacitance and inductance, and a time value from the disconnection of the grid connection switch to the operation stop of the inverter under detection is recorded after a fundamental current value of the grid connection switch is set to a different value each time; and weighted calculation is performed on the time value to obtain a test result and grade evaluation of the anti-island protection ability of the inverter. By adoption of the detection method provided by the present invention, the problem that the anti-island protection ability of the photovoltaic inverter is difficult to precisely evaluate is solved; the anti-island protection performance of the inverter is comprehensively and objectively reflected; and meanwhile the phenomenon that a part of inverters cannot correctly reflect the anti-island ability of the inverters with respect to characteristic load design is effectively avoided, a technical support is provided for the existing method for detecting the anti-island protection performance, and related standard systems in the field of detection of the anti-island protection performance are further enriched and perfected.

The invention provides a PDCdrill bit for rock breaking by thermal spalling. The PDC bit comprises a drill bit body and fixed blades, and PDC teeth, water holes or nozzles are formed in the fixed blades; the PDC drill bit is characterized in that one or more electromagnetic wave generators are arranged on the blades of the drill bit, each electromagnetic wave generator comprises a direct current power supply, an RLC circuit, a high-frequency amplifier and a transmitting antenna, a central water hole is formed in the center of the drill bit, and the drill bit is a steel body bit. In this way, arock is irradiated and heated by electromagnetic waves, and broken by thermal spalling, under the high temperature state, the rock is suddenly cooled when being exposed to water through the central water hole, since the temperature inside the rock changes rapidly, a temperature gradient is formed inside the rock, and the thermal fracture or thermal impact phenomenon occurs in the rock and causesdeterioration of various mechanical properties of the rock; and the drill bit uses two modes of thermal spalling and scraping and cutting of the PDC teeth to break the rock in a coupled mode, thus therock breaking efficiency of the drill bit is improved, the difficulty of the PDC teeth entering the formation can be lowered, the service life of the PDC teeth is prolonged, and comprehensive performance of the drill bit is improved.