78 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 present invention provides a broadband filtering unit, which includes a grounding support base, a feeding balun, and a square radiation surface. Both the front and back surfaces of the square radiation surface are copper-clad. Among them, the shape of the copper cladding on the front is similar to four combined square structures. Two square structures located on the diagonal form two oscillator arms in one polarization direction. The middle positions of each oscillator arm are all hollowed out. The oscillator arm is composed of multiple cascaded LC circuits. Multiple open-circuit filtering stub segments are also arranged on the oscillator arm. The present invention is used in a multi-frequency and multi-array combined antenna, which can well avoid interference with adjacent arrays. Its special multiple filtering structure can adapt to various irregular arrays, effectively reduce the size of the antenna, improve the performance of the antenna interleaved array, and has a simple structure, convenient installation, and low cost. At the same time, by adjusting the positions of the LC circuits and the lengths of the filtering stub segments on the unit radiation surface, the expansion of different frequency bands and the filtering of different frequency bands can be achieved.

An antenna includes a reflector, a radiating element extending forwardly of the reflector, and a director positioned forwardly of the radiating element. The director includes a plurality of passive impedance elements that provide frequency-dependent reactances to currents induced therein responsive to electromagnetic radiation generated by the radiating element. The plurality of passive impedance elements include: (i) a primary capacitive element, (ii) a first series LC circuit having a first inductor therein electrically connected to a first portion of the primary capacitive element, and (iii) a second series LC circuit having a second inductor therein electrically connected to a second portion of the primary capacitive element.

Provided is a smaller filter circuit. The filter circuit has an LC circuit, one end of which is connected to a signal path connecting an input terminal and an output terminal, and the other end of which is connected to a reference potential. A filter circuit according to a first embodiment includes a substrate and a plurality of electrodes provided on a main surface or inside of the substrate. The LC circuit includes a first capacitor, a first inductor connected in parallel, and a second capacitor connected in series. The electrodes overlap each other at least partially when viewed in the thickness direction of the substrate. The portion where the electrodes overlap each other is the electrode of the first capacitor or the second capacitor.

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.

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 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.

Provided are a frequency selective surface and a spatial filtering method. A frequency selective surface unit comprises: a first surface, composed of a plurality of first metal strips interleaved with one another; a second surface, composed of a plurality of second metal strips, wherein each of the second metal strips is provided with a second inter-strip gap, and metal strips at two sides of the second inter-strip gap are connected by means of a metal strip line, so as to form a parallel resonant LC circuit in an H frequency band; and a support plate, the first surface and the second surface being fixed on the same surface or front and back surfaces of the support plate.

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 present invention discloses a method and device for equivalent testing of the current of a gap-type controllable lightning arrester. The method includes: for different overvoltages occurring in the system, measuring or simulating the actual operating current of the lightning arrester; intercepting the current waveform on the operating current of the lightning arrester according to the maximum allowable triggering delay of the gap, and performing equivalent simulation on this section of the current waveform; determining the current amplitude and peak time of this section of the current waveform, and calculating the integral area of this section of the current waveform; based on the current amplitude, peak time and integral area of this section of the current waveform, determining the equivalent current parameters of the sine wave according to the current equivalence principle; and determining the LC circuit parameters for generating the equivalent current according to the equivalent current parameters of the sine wave. The present invention utilizes the working characteristics of the gap triggering circuit under the operating current of the lightning arrester, and has the characteristics of reliable principle, simple method and easy operation, and solves the problems of the triggering source and experimental research of the gap-type controllable lightning arrester under laboratory conditions.

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 present invention relates to a stacked filter. In the stacked filter (1), a first LC parallel resonance section (RP1), a second LC parallel resonance section (RP2), and an LC circuit section are formed in the base body (2). The LC circuit section is connected between the first LC parallel resonance section (RP1) and the second LC parallel resonance section (RP2) on the path between the first terminal electrode 3 and the second terminal electrode 4. In the base body (2), a conductor pattern of an inductor constituting the LC circuit section is not arranged between the conductor pattern of the first inductor (Lin1) constituting the first LC parallel resonance section (RP1) and the conductor pattern of the second inductor (Lin2) constituting the second LC parallel resonance section (RP2), and the first inductor (Lin1) of the first LC parallel resonance section (RP1) and the second inductor (Lin2) of the second LC parallel resonance section (RP2) are magnetically coupled.

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 harmonic termination circuit is integrated into an RF amplifier semiconductor structure. A MIMcap is formed on a grounded source finger of an RF transistor amplifier, and one or more bond wires connect the MIMcap to a gate or drain bond pad of the transistor. The bond wire has an inherent inductance, and together with the MIMcap forms a series LC resonant circuit connected in shunt configuration from the gate or drain bond pad to ground. The LC circuit is tuned to shunt the desired harmonic component to ground, such as by adjusting the length of the bond wire (e.g., by altering its height). Such adjustment can be made after fabrication of the integrated circuit die is complete, and can be changed without requiring re-fabrication. The harmonic termination circuit resides entirely within the amplifier area, and does not increase the size of the die.

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 transmitter for a wireless power transfer system may create an expanding magnetic field by repetitively shorting out an inductive load (e.g., using a plasma switch). For example, the transmitter may comprise a tank circuit (e.g., LC circuit, resonant circuit, or tuned circuit). The tank circuit may comprise an inductor (e.g., a plurality of coils) and a capacitor repetitively connected by a plasma switch. The tank circuit may act as an electrical resonator, e.g., storing energy oscillating at the circuit's resonant frequency. The transmitter may generate a repetitive compression pulse by repetitively short circuiting the tank circuit (e.g., by using a plasma switch). The repetitive compression pulse may create a magnetic field in one or more coils. The magnetic field may induce current in one or more nearby electrical devices.

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.