25 results about "LC circuit" patented technology

This invention discloses an adjustable frequency response microphone integrating XLR and USB outputs, comprising a microphone body, a dynamic microphone driver, a passive filter, a pass-through / preamp circuit, an XLR XLR interface, a USB module, and a function control circuit. The passive filter employs an LC circuit structure, supporting three frequency modes: low-frequency cutoff, mid-frequency boost, and flat response, effectively filtering out ambient noise and enhancing vocal quality. The pass-through / preamp circuit offers both pass-through and preamp modes, with adjustable preamp gain to accommodate dynamic microphone drivers of varying sensitivities, and can be externally or internally powered by phantom power. The USB module integrates a Type-C interface and an audio chip, supporting analog-to-digital / digital-to-analog conversion, real-time headphone monitoring, and external power supply. The function control circuit integrates an encoder and a touch panel, enabling adjustments such as volume, mixing, and mute, and enhances the interactive experience with an RGB lighting module. This invention combines the advantages of professional XLR output with convenient USB output, making it suitable for professional recording, live streaming, gaming, and other scenarios.

The application discloses a low-power-consumption common-gain adjustable metasurface based on nonlinear negative resistance, which comprises a low-power-consumption metasurface unit and a backscattering amplifier connected in series with the low-power-consumption metasurface unit; the low-power-consumption metasurface unit comprises, from top to bottom, an upper copper sheet, an upper dielectric, a metal ground, a lower dielectric and a bottom RLC switching circuit layer; wherein the upper copper sheet is connected with the bottom RLC switching circuit through a through hole; the bottom RLC switching circuit layer comprises a plurality of radio frequency switches and LC circuits or resistors embedded between the radio frequency switches; the backscattering amplifier comprises a matching circuit, the matching circuit is connected with an amplifying circuit through a direct-current isolation part, and the amplifying circuit is connected with a bias circuit through a cross isolation part. After an electromagnetic signal is input into the amplifying circuit through the bottom RLC switching circuit, the LC circuit or the resistor is selected through the radio frequency switch, the electromagnetic signal is amplified, and then the electromagnetic signal is reflected, the LC circuit or the resistor is selected through the radio frequency switch, the electromagnetic signal is transmitted to the upper copper sheet, and then the electromagnetic signal is radiated to the free space.

The invention provides a radio frequency resonator and an ion trap experimental device comprising the same. Wherein the radio frequency resonator comprises a shielding shell, an antenna coil and at least one spiral coil; the shielding shell is of a hollow through cylinder structure and is provided with a shielding cavity and a hollow area penetrating through the shielding shell. The antenna coil is at least partially arranged in the shielding cavity and can be connected with a radio frequency signal source; the spiral coil is arranged in the shielding cavity and is in mutual inductance coupling with the antenna coil, and the spiral coil can be connected with a load; the effective length of the antenna coil in the shielding cavity can be changed so as to adjust the mutual inductance intensity with the spiral coil and realize impedance matching. The topological structure of the radio frequency resonator is designed to be the hollow cylinder, the function of placing other devices in the hollow area of the hollow cylinder is achieved, and the radio frequency resonator has the advantage that the radio frequency resonator and the ion trap can be placed in different cold heads when the radio frequency resonator is used in the cryostat. Meanwhile, impedance matching is realized by adjusting mutual inductance in a manner of stretching and retracting the length of the antenna coil without depending on an external LC circuit.

A radiating element for a base station antenna comprises a feed stalk printed circuit board and a dipole radiator printed circuit board mounted on the feed stalk printed circuit board. The feed stalk printed circuit board includes a first ground line that includes a first integrated parallel LC circuit, a second ground line that includes a second integrated parallel LC circuit, a first signal trace that extends through an opening in the dipole radiator printed circuit board, and a second signal trace.

According to the four-switch Buck-Boost converter and the control method provided by the invention, the four-switch Buck-Boost converter comprising an LC circuit and a Buck-Boost circuit is designed, so that the four-switch Buck-Boost converter has the advantages of the four-switch Buck-Boost converter and the LC circuit at the same time; duty ratio calculation is carried out by using the acquired power supply voltage, the actual voltage of the pre-stage output capacitor and the actual output voltage of the LC circuit to obtain a duty ratio, and a PWM driving signal of each switching tube is generated according to the duty ratio; the conduction time of each switch in the four-switch Buck-Boost converter is controlled through a PWM driving signal, so that the voltage gain of the four-switch Buck-Boost converter is adjusted, it is ensured that an LC circuit can work in a working mode matched with voltage within a wide voltage range, high-efficiency gain conversion is achieved, and the electric energy conversion efficiency is improved while electrical isolation is achieved.

The utility model relates to the technical field of MRI (Magnetic Resonance Imaging) radio frequency coils, in particular to a detuning circuit capable of adjusting resonant inductance for an MRI radio frequency coil. A detuning circuit used for an MRI radio frequency coil and capable of adjusting the resonant inductance value is characterized in that a detuning inductor is arranged on a double-face PCB, one end of the detuning inductor is connected with one end of a capacitor, and a plurality of diodes are connected between the other end of the capacitor and the other end of the detuning inductor in parallel; an upper row of pad through holes and a lower row of pad through holes are uniformly distributed in the double-sided PCB; a copper film wire is printed between every two upper and lower bonding pad through holes in the back surface of the double-sided PCB; every two upper and lower bonding pad through holes are connected through a U-shaped jumper wire, and the two ends of the U-shaped jumper wire penetrate through the bonding pad through holes and are connected with the copper film wires. Compared with the prior art, the inductance value required by resonance of the LC circuit can be accurately adjusted by adjusting the cross sectional area and the height of the U-shaped jumper wire, and meanwhile, the quality factor of the inductor is remarkably improved.

A power transfer and filtering module for a low frequency inductive filtering and music effect pedal assembly. The module has an input interface that supports a USB PD and a power output interface with an LC circuit therebetween. The LC circuit attenuates a signal above a predetermined frequency to reduce undesired noise. The assembly includes one or more musical effect pedals, wherein a power transfer and filter module is electrically connected between the effect pedal and a power source. Using the module can reduce or eliminate undesired noise caused by switching techniques in a USB power supply. The module may filter signals having a frequency of about 270 Hz and above.

The application provides a four-switch Buck-Boost converter and a control method. The four-switch Buck-Boost converter including an LC circuit and a Buck-Boost circuit is designed to have the advantages of the four-switch Buck-Boost and the LC circuit. The duty cycle is calculated by using the collected power supply voltage, the actual voltage of the output capacitor of the previous stage and the actual output voltage of the LC circuit, the duty cycle is obtained, and the PWM driving signal of each switch tube is generated according to the duty cycle. The conduction time of each switch in the four-switch Buck-Boost converter is controlled by the PWM driving signal to adjust the voltage gain of the four-switch Buck-Boost converter, so that the LC circuit can work in the voltage matching mode in a wide voltage range, the efficient gain conversion is realized, and the electrical isolation is provided while the power conversion efficiency is improved.

The invention provides a voltage sag treatment circuit and a control method thereof, and relates to the technical field of power electronics and electric energy quality control. According to the circuit, a super capacitor and a lithium battery are boosted through a DC / DC converter, are connected to the same direct current bus, are converted into alternating current through a DC / AC inverter, are filtered through an LC circuit, and are connected with a sensitive load in parallel through a bidirectional thyristor. According to the circuit matching method, rapid response to the voltage sag caused by the sensitive load can be realized by combining the advantages of low cost, rapid response of the super capacitor and large capacity of the lithium battery, and the circuit matching method has considerable stable anti-interference capability so as to realize rapid and effective treatment of the voltage sag.

A power amplifier circuit and an LC circuit are included. The power amplifier circuit amplifies a radio frequency signal by switching between the first mode, in which power is amplified by using the envelope tracking system, and the second mode, in which power is amplified by using the average power tracking system. The LC circuit is connected, at its first end, to the power supply path of the power amplifier circuit and that is grounded, at its second end, through a switch circuit. The LC circuit includes a first capacitor and an inductor that is connected in series to the first capacitor. The switch circuit is controlled to be switched off in the first mode and is controlled to be switched on in the second mode.

This invention discloses a lumped 90° phase difference filtering power distribution device, belonging to the field of microwave technology. The invention employs a centrally symmetrical integrated structure constructed with fully lumped-parameter components, including four ports, a ring-shaped symmetrical inductor circuit, a cross-shaped symmetrical capacitor circuit, and two sets of trapezoidal symmetrical LC circuits. The ring-shaped symmetrical inductor circuit and the cross-shaped symmetrical capacitor circuit are connected via an embedded interconnection, and the two sets of trapezoidal symmetrical LC circuits are connected in parallel with the former two, one above the other. This invention regulates the output phase difference through the ring-shaped symmetrical inductor circuit and controls the power distribution ratio through the trapezoidal symmetrical LC circuits. These three components work together to form multiple transmission zeros to achieve filtering functionality, simultaneously realizing 90° quadrature phase output, unequal power distribution, and filtering response. It possesses advantages such as compact structure, miniaturization, high integration, and low insertion loss.

Provided are a power regulation circuit and method for a chip, and a power supply circuit for a circuit. The power regulation circuit includes an LC circuit and an LC correction circuit. One terminal of the LC circuit is electrically connected to a positive pole of a chip and a positive electrode of a power supply. The other terminal of the LC circuit is electrically connected to a negative pole of the chip and a negative pole of the power supply. The LC correction circuit is electrically connected to the chip and the LC circuit, and is used to regulate a working parameter of the LC circuit according to the current working mode of the chip.

A power amplification circuit (10) comprises: power amplifiers (11, 12); an orthogonal hybrid circuit (15) that includes an input terminal (151) which is connected to a high-frequency input terminal (13), an output terminal (152) which is connected to an input end of the power amplifier (11), and an output terminal (153) which is connected to an input end of the power amplifier (12); a synthesis circuit (16) that includes an input terminal (161) which is connected to an output end of the power amplifier (11), an input terminal (162) which is connected to an output end of the power amplifier (12), and an output terminal (163) which is connected to a high-frequency output terminal (14); a capacitor (171) that is connected between the output end of the power amplifier (11) and the input terminal (161); a series LC circuit (172) that is connected between the ground and a path which connects the output end of the power amplifier (11) and the input terminal (161); and a parallel LC circuit (181) that is connected between the output end of the power amplifier (12) and the input terminal (162).

There is provided a high frequency AC inverter comprising a DC-DC circuit, an output power circuit and a load circuit and a controller. The load circuit comprises a load circuit detector configured to detect the electrical parameters of the load circuit. The output power circuit comprises a DC to AC driver having a variable frequency output, a HFAC driver circuit and a transformer coupled to the HFAC driver circuit and the load circuit. The HFAC driver circuit comprises a resonant network resonant network comprising a first resonant tank, a second resonant tank and a third resonant tank, the first resonant tank comprising a series LC circuit and having a first resonant frequency, the second resonant tank comprising a parallel LC circuit and having a second resonant frequency, a third resonant tank comprising first part having a parallel LC circuit with a third resonant frequency and a second part comprising a series inductor, wherein the first resonant frequency, the second resonant frequency and the third resonant frequency are the same.

This invention relates to the field of smart wearable device technology, specifically to an anti-motion sickness watch system based on targeted neural modulation, comprising: a first-stage boost module, used by the main control chip to output a PWM square wave, driving a transistor to frequently switch, thereby driving an LC circuit to continuously charge, achieving first-stage boost; a coupling module, used to connect the first-stage boost to the first and second input terminals of a transformer, and simultaneously, based on the PWM signal of the first-stage boost module, the main control chip controls the output of two other I / O ports to control the conduction and cutoff of the first and second output terminals of the transformer, generating a weakly modulated waveform through electromagnetic coupling synthesis via the transformer; and a second-stage boost module, used to boost the weakly modulated waveform through the transformer to generate a high-voltage sine wave pulse sequence including a periodic high-voltage maintenance phase, achieving second-stage boost. This invention can achieve precise synthesis of composite waveforms through multi-level data processing and collaborative control.

Embodiments described herein provide a wireless power transmitter that dynamically adjusts dead time to reduce power loss. Specifically, a wireless power transmitter includes a transistor circuit for switching a first voltage at a first node and a second voltage at a second node, and an LC circuit coupled between the first node and the second node. The wireless power transmitter also includes a controller coupled to the transistor circuit. The controller is configured to determine whether any one of the first voltage and the second voltage is negative during a dead time of the switching. The controller is configured to increment or decrement the dead time by an adjustment amount depending on whether the negative voltage is detected.

The electronic device includes: a first signal port; a second signal port; an LC circuit disposed between the first signal port and the second signal port, comprising at least one capacitor and at least one inductor, and configured to selectively allow signals of frequencies above a specific frequency to pass through; a first path from the first signal port to the LC circuit; a second path from the second signal port to the LC circuit; a first inductor disposed between the first path and a ground; and a second inductor disposed between the second path and the ground. The first inductor and the second inductor are physically configured in a mutually coupled manner.

A hybrid EM-LC resonator for wireless power transmission (WPT) systems comprises multiple capacitive loops and LC circuits, each having mutual inductance in a non-resonant operating mode. This resonator is usable in wireless energy transmission systems. The system comprises transmitter antenna components and receiver antenna components, each component comprising at least two separate circuits. One way to separate the circuits is to place them at a predetermined distance from each other, as shown in the diagram below. Sufficient separation of the circuits is necessary to allow for relatively loose coupling between them.

An aerosol-generating device comprising: an inductive heating arrangement configured to heat an aerosol-forming substrate, the inductive heating arrangement comprising: a susceptor arrangement heatable by penetration by a varying magnetic field to heat the aerosol-forming substrate, a first LC circuit comprising at least a first inductor coil and a first capacitor, wherein the first LC circuit has a resonant frequency, and a second LC circuit comprising at least a second inductor coil and a second capacitor, wherein the second LC circuit has the same resonant frequency as the first LC circuit; and a controller, wherein the controller is configured to drive the first LC circuit with a first AC current for generating a first alternating magnetic field to heat a first portion of the susceptor arrangement, wherein the controller is configured to drive the second LC circuit with a second AC current for generating a second alternating magnetic field to heat a second portion of the susceptor arrangement, and wherein the controller is configured to supply the first AC current with a frequency corresponding to the resonant frequency of the LC circuits and to supply the second AC current with a frequency different from the resonant frequency. An aerosol-generating system comprising an aerosol-generating device and an aerosol-generating article comprising an aerosol-forming substrate.

The invention provides an antenna structure and electronic equipment, and belongs to the technical field of wireless communication. The antenna structure provided by the embodiment of the invention comprises a first radiation branch knot and a second radiation branch knot, wherein a first breaking joint is formed between the first radiation branch knot and the second radiation branch knot; the first radiation branch knot comprises a first end and a second end, the first end is grounded, a first feeding point is arranged at a first position of the first radiation branch knot, and the first position is located between the first end and the second end; the second radiation branch comprises a third end and a fourth end, the fourth end is provided with a second feeding point, the second radiation branch is grounded at a second position through a first tuning structure, the first tuning structure is an inductor or a first LC circuit, the second radiation branch is grounded at a third position through a second tuning structure, and the second tuning structure is a capacitor or a second LC circuit. The second position is close to the third end, and the third position is located between the second position and the fourth end; and the first feeding point and the second feeding point are feeding points of different antennas respectively.

The invention relates to a radiating element with a common mode resonance suppression circuit and a related base station antenna. A radiating element for a base station antenna includes a feed handle printed circuit board and a dipole radiator printed circuit board mounted on the feed handle printed circuit board. The feed handle printed circuit board includes: a first ground line including a first integrated parallel LC circuit; the second ground wire comprises a second integrated parallel LC circuit; a first signal trace extending through an opening in the dipole radiator printed circuit board; and a second signal trace.

The utility model relates to the technical field of harmonic suppression, in particular to a radio frequency equipment secondary harmonic suppression circuit based on band-pass filtering. The suppression circuit comprises: a T-type circuit comprising a first inductor (L1), a second inductor (L2) and a bridging capacitor (C1); the LC circuit comprises a third inductor (L3) and a capacitor (C2); one end of a first inductor (L1) of the T-type circuit is connected to an input end, the other end of the first inductor (L1) is connected to one end of a second inductor (L2) and one end of a bridging capacitor (C1), the other end of the second inductor (L2) is connected to an output end, and the other end of the bridging capacitor (C1) is connected to the ground. According to the utility model, through the combination of the T-type circuit and the LC circuit, the problems in the prior art are effectively solved. Specifically, by optimizing element layout and adjusting parameters, efficient impedance matching is realized, and energy loss and reflection interference in signal transmission are remarkably reduced.

A substrate processing system includes a drive circuit, an RF reference measuring circuit, and a make-break connector. The drive circuit generates an RF drive signal at a first RF frequency. The RF reference measuring circuit includes an LC circuit having an input impedance and an output impedance. An output of the LC circuit connects to an RF power meter and a dummy load. The make-break connector connects the drive circuit to one of the RF reference measuring circuit and a processing chamber load including a component of the substrate processing system. An output impedance of the drive circuit matches an impedance of an input impedance of the LC circuit. The output impedance of the drive circuit does not match impedances of the RF power meter and the dummy load. The LC circuit matches the impedance of the drive circuit to the RF power meter and the dummy load.

Cascaded filter (60) for high-frequency filtering, comprising: a hybrid acoustic LC filter (62) configured to filter a high-frequency signal, comprising a first acoustic resonator (A61) on an acoustic resonator raw chip, a second acoustic resonator (A62), a capacitor (C601; C602; C603; C604) outside the acoustic resonator raw chip, and an inductor (L601; L603; L604; L605; L606) outside the acoustic resonator raw chip; and a non-acoustic LC filter (64) which is cascaded with the hybrid acoustic LC filter (62) and includes an LC circuit.

Voltage regulator (100) configured to provide an output current at an output voltage at an output node of the voltage regulator (100) based on an input voltage at an input node of the voltage regulator (100); wherein the output node of the voltage regulator (100) is coupled to an output capacitor (106) via a conducting path having a parasitic inductance (211, 212); wherein the output capacitor (106) and the parasitic inductance (211, 212) form an LC circuit with an LC resonant frequency; wherein the voltage regulator (100) comprises - an output amplification stage (103) for deriving the output current at the output node from the input voltage at the input node as a function of a driver voltage at an intermediate node of the voltage regulator (100); - an intermediate amplification stage (102) to provide the driver voltage at the intermediate node based on a differential output voltage; - a differential amplification stage (101) configured to determine the differential output voltage as a function of the output voltage and as a function of a reference voltage (108); - a sensing unit (241) configured to provide a load indication that specifies the output current; and - a variable impedance (242) coupled to the intermediate node; wherein the variable impedance (242) depends on the load specification; wherein the voltage regulator (100) without the variable impedance (242) has a bandwidth and / or a gain bandwidth frequency that increases with increasing output current, such that for an output current at or above a threshold current, the LC resonant frequency falls within the bandwidth and / or is lower than the gain bandwidth frequency; and wherein the variable impedance (242) is configured such that for the voltage regulator (100) with the variable impedance (242) - the LC resonant frequency is higher than the bandwidth and / or the gain bandwidth frequency of the voltage regulator (100) at an output current at or above the threshold current; and - the bandwidth and / or the gain bandwidth frequency of the voltage regulator (100) with the variable impedance (242) corresponds to the bandwidth and / or the gain bandwidth frequency of the voltage regulator (100) without the variable impedance (242) for an output current below the threshold current; wherein - the variable impedance (242) has a capacitor (342) which is arranged in series with a variable resistor (341); - the series arrangement of the capacitor (342) and the resistor (341) is arranged to couple the intermediate node to a reference potential of the voltage regulator (100); and - the variable resistance (341) depends on the load specification.