47 results about "LC circuit" patented technology

The invention relates to the technical field of resonance suppression, and discloses an active damping control LC resonance suppression method and device. The method comprises the following steps: performing parameter identification processing based on bus voltage to obtain an inductance value, a capacitance value and a resonance frequency of an LC circuit; extracting a resonant current component of the current signal based on the resonant frequency; calculating damping power according to the resonance current component, and converting the damping power into a voltage compensation instruction under an alpha-beta coordinate system; generating a PWM control signal according to the voltage compensation instruction and a voltage reference instruction; and performing on-off control on the inverter based on the PWM control signal, and injecting power opposite to the resonant current component into the LC circuit to generate a virtual damping effect. Virtual impedance characteristics are seamlessly integrated into inverter control, rapid response of the whole process from resonance detection to power injection is ensured, the resonance peak value is effectively suppressed, and the current quality is improved.

The utility model relates to a radio frequency power amplification circuit with a harmonic suppression function and a radio frequency chip. The radio frequency power amplification circuit comprises an input matching unit, a first-stage power amplification unit, a first-stage bias unit, a first-stage power supply unit, an inter-stage matching unit, a second-stage power amplification unit, a second-stage bias unit, a second-stage power supply unit and an output matching unit. According to the utility model, the LC type trap circuits are designed and used in the power supply unit and the inter-stage matching unit, so that secondary, tertiary and high-order harmonic suppression is realized in the radio frequency power amplification circuit; meanwhile, based on LC circuit structures in the power supply unit and the inter-stage matching unit, the inter-stage matching bandwidth is widened, and the linearity of the multi-stage power amplification unit is improved.

The invention belongs to the field of microwave sensors, and particularly relates to a wireless passive tunable temperature sensor in a severe environment. The objective of the invention is to optimize the adjustment adaptability of the wireless passive temperature sensor in a severe environment, thereby improving the measurement precision. The temperature sensor comprises an upper-layer metal structure, an aluminum oxide substrate, a lower-layer metal structure and a photosensitive structure. The upper-layer metal structure is arranged on the surface of one side of the aluminum oxide substrate, and the lower-layer metal structure and the photosensitive structure are arranged on the surface of the other side of the aluminum oxide substrate; the surfaces of the sides, away from the upper metal structure, of the lower metal structure and the photosensitive structure are covered with transparent aluminum oxide film structures; and the photosensitive structure is a silicon-doped material and is configured to adjust the dielectric constant of the equivalent LC circuit of the temperature sensor under the condition of receiving near-infrared light pumps with different powers, so that the resonant frequency and the amplitude are controllably changed.

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.

A system includes a pulsed direct current (DC) source. The pulsed DC source generates a DC voltage signal. The system includes an inductor-capacitor (LC) circuit coupled to the pulsed DC source to receive the DC voltage signal to output a square waveform voltage. The system further includes a high frequency (HF) radio frequency (RF) generator that generates an RF waveform. The system includes an impedance matching circuit coupled to the HF RF generator to receive the RF waveform to output a modified RF waveform. The LC circuit is coupled to the impedance matching circuit at a point to combine the modified RF waveform with the square waveform voltage. The modified RF waveform is combined with the square waveform voltage to output a modified square waveform voltage. The system includes a plasma chamber coupled to the point to receive the modified square waveform voltage.

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.

The present application belongs to the field of microwave sensors, and particularly relates to a wireless passive tunable temperature sensor in harsh environment. The wireless passive temperature sensor is optimized in adjustment adaptability in harsh environment, so as to improve the measurement accuracy. The temperature sensor comprises an upper metal structure, an alumina substrate, a lower metal structure and a photosensitive structure; the upper metal structure is arranged on one side surface of the alumina substrate, the lower metal structure and the photosensitive structure are arranged on the surface of the other side of the alumina substrate; the surface of the lower metal structure and the photosensitive structure away from the upper metal structure is covered with a transparent alumina film structure; the photosensitive structure is a doped silicon material, which is configured to adjust the dielectric constant of the equivalent LC circuit of the temperature sensor under the condition of receiving near-infrared light pumping with different powers, so as to produce controllable changes in the resonant frequency and amplitude.

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 invention discloses a flexible alternating current energy consumption device and method for a new energy flexible direct output system and control equipment of the flexible alternating current energy consumption device and method, and relates to the technical field of power system protection. According to the invention, the three-phase arrangement of the energy consumption switch is converted into the single-phase arrangement by using the scheme of AC-DC circuit conversion, so that the number and occupied area of required devices can be reduced. According to the alternating current energy consumption device, frequency conversion control is adopted, the energy consumption switch composed of the thyristor and the LC circuit and the buffer inductor are used, flexible controllability and flexible switching of energy consumption power are achieved, and the performance of the alternating current energy consumption device can be effectively improved.

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.

A base station antenna includes an array of lower band radiating elements, an array of higher band radiating elements, and a frequency selective surface having a plurality of unit cells. The equivalent circuit of each unit cell includes a first shunt inductor-capacitor ("LC") circuit embedded within a second shunt LC circuit.

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.

The application belongs to the technical field of electronic circuits, and particularly relates to a high-order topological insulator circuit design method based on graphdiyne structure. The method comprises the following steps: (1) establishing an LC circuit model of a two-dimensional rhombus-shaped graphdiyne structure; (2) obtaining the admittance matrix of the circuit according to the Kirchhoff equation, solving the matrix eigenvalues and eigenvectors by using MATLAB, and obtaining the admittance band structure; (3) changing the size of the capacitance proportion parameter, so that the topological phase transition of the circuit system can be realized; (4) in the topological non-trivial phase parameter region, the impedance distribution under different frequencies is calculated, and it can be observed that the system has zero energy angle state, i.e. second-order topological state; (5) the impedance distribution under a specific frequency is measured, and it is observed in the experiment that the topological angle state is localized in the obtuse angle or acute angle region of the rhombus-shaped circuit board, and the system has high-order topological properties.

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.

The invention discloses an electromagnetic heating circuit of a heating smoking set, a control method of the electromagnetic heating circuit and the heating smoking set. The circuit comprises a battery cell, a boosting module, an LC resonance module and a control module. The boost module comprises a first capacitor, a boost inductor, a first switch, a first pulse width modulation unit and a diode. The first pulse width modulation unit generates a first control signal. The LC resonance module comprises a second capacitor, a second switch, a third switch, a second pulse width modulation unit, a third pulse width modulation unit and an LC circuit; the second pulse width modulation unit and the third pulse width modulation unit respectively generate a second control signal and a third control signal which have the same frequency and opposite phases; the control module adjusts the duty ratio of the first control signal and the frequencies and duty ratios of the second control signal and the third control signal so as to adjust the heating power of the LC circuit. The problem that noise is generated when the heating circuit switches on and off the LC circuit is solved, and meanwhile, the temperature curve change can be quickly responded by dynamically adjusting the boost voltage.

A hybrid EM-LC resonator for a wireless power transfer (WPT) system includes a plurality of capacitive loops and LC circuits each having mutual inductance in a non-resonant mode of operation. The resonator is useful in a wireless energy transfer system. The system comprises a transmitter antenna assembly and a receiver antenna assembly, wherein each antenna assembly comprises at least two circuits isolated from each other. One way of isolating circuits is to place them at a pre-selected distance from each other, as shown below. It is required to sufficiently separate the circuits to allow for a relatively loose coupling between them.

A system for an electrified vehicle, such as a battery electric vehicle (BEV), includes an inverter configured to drive a motor having motor windings with electrical power from a battery according to a configuration of a power switch of the inverter. The system further includes a capacitor connected between a center-tap of the battery and a neutral-point of the motor winding whereby the capacitor and the motor windings form an LC circuit. The system further includes a controller configured to operate the power switch in a zero-current-switching mode with a switching frequency dependent on a resonant frequency of the LC circuit to thereby cause electrical current to circulate between the battery, the inverter, and the motor which heats the battery and the motor windings.

An LC circuit and a filter are provided. The LC circuit includes a first capacitor disposed between a first connection point and a second connection point, a second capacitor disposed between the second connection point and a third connection point, a third capacitor disposed between the third connection point and a fourth connection point, a fourth capacitor disposed between the first connection point and the third connection point, a fifth capacitor disposed between the second connection point and the fourth connection point, a first inductor connected to the second connection point, and a second inductor connected to the third connection point.

A controller and a method is provided for controlling a capacitance of an LC circuit having a circuit frequency including, a variable capacitor to couple with an external inductor as part of an LC circuit, a target value, a spread spectrum function to generate an adjustment value, and a circuit to poll the target value, call the spread spectrum function, and set a capacitance of the variable capacitor based on the sum of the target value and the adjustment value.

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.

The utility model discloses a power supply circuit and a power supply system, the power supply circuit comprises a boost-buck circuit, an LC circuit, a first-stage auxiliary source circuit and a second-stage auxiliary source circuit, the input end of the boost-buck circuit receives a first voltage from a power supply device, and the output end of the boost-buck circuit is connected with the LC circuit. The input end of the first-stage auxiliary source circuit receives first voltage from power supply equipment, the input end of the second-stage auxiliary source circuit is connected with the output end of the first-stage auxiliary source circuit, the output end of the second-stage auxiliary source circuit is connected with the buck-boost circuit and the LC circuit, and the input end of the first-stage auxiliary source circuit is further connected with the output end of the buck-boost circuit; the first-stage auxiliary source circuit is used for converting the first voltage into the second voltage, the input end of the first-stage auxiliary source circuit receives the fourth voltage and is used for converting the fourth voltage into the second voltage, and the fourth voltage is larger than the first voltage. By means of the mode, voltage conversion is carried out through the high input voltage, and the conversion efficiency of the first-stage auxiliary source circuit can be improved.

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.

An electronic component includes a first signal port, a second signal port, an LC circuit that is provided between the first signal port and the second signal port, includes at least one capacitor and at least one inductor, and is configured to cause a signal having a frequency equal to or higher than a specific frequency to pass through selectively, a first path that extends from the first signal port to the LC circuit, a second path that extends from the second signal port to the LC circuit, a first inductor that is provided between the first path and a ground, and a second inductor that is provided between the second path and the ground. The first inductor and the second inductor are physically arranged so as to be coupled to each other.

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.