15 results about "Lc resonant circuit" patented technology

The application provides a non-invasive implantable wall deformation volume sensor, and relates to the technical field of implantable biomedical sensors, which comprises an elastically deformable closed ring-shaped base, a conductive coil arranged on the ring-shaped base, a capacitor forming an LC resonant circuit with the conductive coil, an elastic support structure arranged in the ring-shaped base, and a biocompatible encapsulation layer covering the outside. The sensor controls the distribution ratio and mechanical rigidity of the support structure, so that the ring-shaped base produces controllable concave deformation under the action of the pressure of the inner wall of an organ, thereby changing the geometric parameters of the conductive coil and causing the resonant frequency to change, and the detection of the volume change of the organ is realized. In addition, the elastic support structure and the ring-shaped base form a connection mode allowing relative sliding, so that the sensor can automatically expand by the elastic force after compression delivery. The application can respond to the overall geometric deformation, and has the advantages of simple structure and high mechanical compliance.

This invention relates to an inductive sensor device for detecting changes in the position of an actuating element. The sensor device comprises: - an LC resonant circuit having an inductive element (L) and a capacitive element (C); - an excitation supply for exciting the LC resonant circuit by coupling an excitation voltage (U) to the LC resonant circuit; - a decoupling element arranged between the excitation supply and the LC resonant circuit; and - an evaluation device for evaluating signal attenuation in the resonant circuit. The invention also relates to an actuation device.

This invention relates to a circuit board for an ozone generator with frequency tracking functionality. The circuit board includes a frequency tracking circuit comprising an RC oscillation unit, an LC resonant unit, a current sampling unit, a comparison control unit, a voltage divider bias unit, and a frequency limiting protection unit. The LC resonant unit includes a resonant inductor T1 and a resonant capacitor C1, used to drive the ozone sensor. The current sampling unit includes a sampling resistor R8 connected in series in the LC resonant circuit, used to acquire the circuit current signal. The comparison control unit includes a comparator U1, a transistor Q1, a rectifier diode D2, and a filter capacitor C3. The voltage signal from the sampling resistor R8 is rectified by D2 and filtered by C3 before being input to the inverting input of U1. The voltage divider bias unit includes resistors R3 and R6. The RC oscillation unit is connected to the transistor Q1. This invention can adapt to capacitance changes during ozone sensor power-on and operation, automatically tracking the frequency and achieving resonance, while ensuring stable output power, extending device lifespan, and improving ozone generation efficiency and overall reliability.

The invention provides a high-suppression passive reconfigurable intermediate-frequency filter based on a GaAs process, which comprises a high-order reconfigurable low-pass filter unit and a high-order reconfigurable high-pass filter unit which are in cascade connection, and is characterized in that the high-order reconfigurable low-pass filter unit is designed based on a seven-order low-pass elliptic function prototype and comprises a series branch and a parallel branch; the parallel branch comprises an adjustable capacitor and an inductor connected in series, bandwidth mode switching is achieved by adjusting the position of a transmission zero point, a fixed LC resonance circuit is introduced into the series branch to generate a fixed transmission zero point, and out-of-band rejection is enhanced; the high-order reconfigurable high-pass filter unit is designed based on a seven-order high-pass elliptic function prototype and comprises a series capacitor and a parallel grounding branch, and the parallel grounding branch comprises an inductor and an adjustable capacitor which are connected in series and is used for introducing a transmission zero point of a low-frequency stop band. According to the scheme, low insertion loss is kept while bandwidth mode switching is achieved, and the far-end out-of-band rejection capacity is remarkably improved.

The utility model provides a kind of RF and EMS common circuit, including high frequency radio frequency circuit, RFADC skin detection circuit, EMS circuit, EMS and RF isolation circuit, the RF power supply of high frequency radio frequency circuit is provided by DC-DC boost, high frequency radio frequency circuit receives the high frequency signal RFIN input by MCU, through MOS tube Q1 drive LC resonant circuit, in RF output point generation with the AC RF signal of RFIN same frequency, signal amplitude is decided by VCC-RF;RFADC skin detection circuit input end is connected with the output end of high frequency radio frequency circuit, whether contact skin is judged by detecting the voltage change of RFADC detection point when contact skin.The utility model has the beneficial effects that:1.The utility model's EMS and RF isolation circuit use inductance to isolate the interference of RF radio frequency circuit, to realize the common use of RF and EMS technology;2.It can realize 3MHZ above RF radio frequency.

The application relates to an output matching circuit, a power amplifier and a radio frequency module, wherein the output matching circuit comprises: a first fixed matching network for performing preliminary coarse matching on the output impedance of the power amplifier to obtain an intermediate target impedance; a tunable parallel LC resonant circuit comprising a tunable inductor and a tunable capacitor in parallel, for performing individual matching on the intermediate target impedance to compensate for electronic component tolerances; a second fixed matching network for converting the matched intermediate target impedance into a standard load impedance; and a microcontroller connected to the tunable inductor and the tunable capacitor, for adjusting the inductance value of the tunable inductor and the capacitance value of the tunable capacitor. The application can improve the consistency of each radio frequency module.

The application discloses an ultrasonic sensor, a control method thereof, and an electronic device. The ultrasonic sensor comprises a transmitting circuit comprising an LC resonant circuit composed of a center-tapped transformer and a piezoelectric transducer in parallel; the LC resonant circuit further comprises a matching capacitor connected in parallel between a first common node and a second common node, and a damping resistor connected between the first common node and a ground terminal; the second common node and one end of the piezoelectric transducer connected to the second common node are both connected to the ground terminal; a receiving circuit comprising the piezoelectric transducer and a sampling component connected in parallel to the piezoelectric transducer; a switch circuit connected between the damping resistor and the ground terminal; further comprising a bias resistor connected between the first common node and the second common node; and a control circuit configured to control the switch circuit to be turned on in a transmitting phase and turned off in a receiving phase.

The application discloses a high-order mode coupler with double-inhibiting structure and a manufacturing method thereof. The high-order mode coupler comprises an extraction component and a coupling component; the coupling component is provided with a coupling hook for deeply coupling electromagnetic field transmitted by a superconducting cavity and inputting the electromagnetic field to the extraction component; the extraction component is used for extracting the input electromagnetic field to a normal temperature zone; a first coupling capacitor is formed between the lower end of the coupling hook and the tube wall of the superconducting cavity tube for determining the frequency point of the base mode inhibition; a second coupling capacitor is formed between a T-shaped probe and the tube wall of the extraction component for adjusting the bandwidth of the base mode inhibition frequency point; a third coupling capacitor is formed between the bottom end of the inner conductor of the extraction component and the top end of the coupling hook for adjusting the transmission efficiency of electromagnetic field energy; the first coupling capacitor is a first inhibiting structure, and the LC resonant circuit composed of the T-shaped probe and the second coupling capacitor is a second inhibiting structure. The application solves the base mode tuning problem and the heating problem of the high-order mode coupler.

The application discloses a temperature and humidity integrated sensor based on a paper folding structure, which comprises a wireless transmission structure, a thermal driving beam structure, a paper folding beam structure and an interdigital capacitive humidity sensing structure. When the ambient temperature is higher than a plurality of set temperature points, the paper folding beam structure is bent to cause a plurality of contact electrodes to contact with contact electrodes, an LC resonant circuit is formed by the interdigital capacitive humidity sensing structure and the wireless transmission structure, the sequential contact of the contact electrodes and the contact electrodes causes the change of an induced capacitance, and the resonant frequency is greatly changed. When the ambient humidity changes, the dielectric constant of a film material in the interdigital capacitive humidity sensing structure changes to cause the slight change of the interdigital capacitance, so that the resonant frequency is slightly deviated near the temperature jump point. The temperature and humidity resonant frequency sensing information is collected in a passive and wireless mode through electromagnetic coupling, the simultaneous measurement of the temperature and humidity sensor is realized, and the scheme has the advantages of multi-parameter sensing, passive and wireless and simple structure.

The application provides a kind of capacitance measuring device, method and chip probe test system.The capacitance measuring device includes probe plate and capacitance measuring circuit, probe plate includes probe, and capacitance measuring circuit includes LC resonant circuit and current drive unit.LC resonant circuit is used to be connected in parallel with the two poles of probe and the chip to be measured, LC resonant circuit has no-load state and loaded state, when probe and the chip to be measured do not contact, LC resonant circuit is in no-load state;When probe and the chip to be measured are in contact, LC resonant circuit is in loaded state.Current drive unit is used to provide driving current for LC resonant circuit, to make LC resonant circuit produce resonance, and resonance amplitude is lower than the opening voltage of the diode inside the chip to be measured.Capacitance measuring device is used to obtain the capacitance of the chip to be measured based on the data of the resonance waveform of LC resonant circuit in loaded state and no-load state, by calculating processing to obtain the capacitance offset of LC resonant circuit.

This utility model discloses a choke tuner with isolation circuit, relating to the field of tuner technology. It includes a tuner housing, a capacitor, a choke coil assembly, and a display screen. The capacitor is installed inside the tuner housing, and the choke coil assembly is disposed on one side of the capacitor. The display screen is fixedly embedded in the upper surface of the tuner housing. The corners of the tuner housing are chamfered. The capacitor has an electrical specification of 20uF / 1000V, and forms an LC resonant circuit through an inductor. The tuner housing is made of FV-2 flame-retardant material with insulation class F and high-temperature resistance class F, effectively preventing fire risks. The surface of the housing is treated with chromate passivation zinc plating to form an anti-oxidation colored film, enhancing corrosion resistance. The use of a 20μF / 1000V capacitor paired with a high-saturation-current inductor meets the requirements of high-current applications, improves energy transmission efficiency, and enhances the safety of the tuner.

A drive control apparatus is configured to drive and control a composite resonance circuit including LC resonant circuits including inductances L of power transmitting and receiving coils electromagnetically coupled to each other. The drive control apparatus includes: an inverter circuit configured to drive the composite resonance circuit by converting input DC power into AC power by switching the DC power at a predetermined operating frequency; an input current detector configured to detect an input current of the inverter circuit; and a frequency controller and driver configured to generate a drive signal of the inverter circuit while changing the operating frequency by using a predetermined extreme value search method to drive the inverter circuit, search for a resonance frequency of the composite resonance circuit based on the detected input current, and set the operating frequency based on the searched resonance frequency.

This disclosure provides an isolated DC-DC power supply and electronic device. The DC-DC power supply includes: a cross-coupled circuit, a primary coil, etc.; the cross-coupled circuit and the primary coil form an LC resonant circuit; the cross-coupled circuit includes two cross-coupled power switching transistors and capacitor array circuits corresponding to the power switching transistors one-to-one, the first terminal of each capacitor array circuit is electrically connected to the drain of the corresponding power switching transistor, and the second terminal of each capacitor array circuit is grounded; each capacitor array circuit includes several parallel capacitor branches, and each capacitor branch includes a branch switch and a branch capacitor connected in series. This disclosure controls the resonant frequency to fluctuate within a wider range by randomly selecting capacitors of different sizes in the capacitor array circuit, which can disperse the radiation spectrum originally concentrated in the same frequency band to more and wider frequency bands, so that the average value of the noise signal decreases with the change of frequency, thereby reducing electromagnetic radiation interference.

The application provides a multifunctional wideband common mode filter, comprising an integrated common mode filter and an electrostatic protection module, the common mode filter comprising a coupled inductor with common mode rejection capability, the coupled inductor being composed of multiple inductive couplings, the electrostatic protection module being provided with multiple electrostatic protection devices and at least one inductor, the electrostatic protection devices and the inductor in the electrostatic protection module forming a series LC resonant circuit with common mode rejection capability, the coupled inductor and the electrostatic protection module further forming a wideband series LC resonant circuit with wideband common mode rejection capability, the multiple electrostatic protection devices in the electrostatic protection module being three electrostatic protection devices, and each two adjacent electrostatic protection devices in the three electrostatic protection devices being coupled to form a low-impedance electrostatic discharge path. The application has the beneficial effect that the common mode filter can realize wideband common mode rejection capability and electrostatic protection capability.

This invention relates to a method for detecting the mass of ferromagnetic particles based on a magnetic rod sensor. The magnetic rod sensor has a detection end and a control end with a magnetic rod and an LC resonant circuit. The method includes: when the magnetic rod attracts ferromagnetic particles in oil onto an induction coil, the control end controls the LC resonant circuit to generate a self-excited oscillation signal related to the change in inductance of the winding; the control end analyzes the self-excited oscillation signal to obtain the resonant frequency of the LC resonant circuit, and then calculates the mass of the ferromagnetic particles attracted by the magnetic rod based on the resonant frequency; the control end sends out the calculated ferromagnetic mass as an analog signal or a digital signal. This invention improves detection sensitivity by using a magnetic rod formed by multiple magnets connected in series to form a larger attraction area and attraction magnitude, and by using several coils connected in series with opposite directions to form a winding. The method implemented based on the above-mentioned equipment can promptly understand the wear status of the monitored system or equipment.