39 results about "Parallel resonance" patented technology

The wireless communication device includes a rectangular base plate (10), a square opposing conductor plate (30), and a short-circuit section (40), configured as a zero-order resonant antenna that uses the electrostatic capacitance formed by the opposing conductor plate (30) and the base plate (10) and the inductance of the short-circuit section (40) to achieve LC parallel resonance. A power supply point (31) is formed at the edge of the opposing conductor plate (30). The opposing conductor plate (30) is positioned at a position offset by a predetermined end offset (De) from the end of the base plate (10) in the long side direction. The length of the base plate (10) in the long side direction is set to λ / 4×N+α. N is a natural number, and α is a predetermined value of 0.025λ or more and less than 0.225λ.

The application discloses a high-order mode coupler based on a double-inhibition structure of a transmission line model and a design method, and belongs to the accelerator physics and superconducting high-frequency technical field.The method comprises the following steps: determining a superconducting cavity base mode frequency, a high-order mode frequency band and an external quality factor Qe requirement; establishing an equivalent transmission line model comprising two parallel resonance base mode inhibition structures; optimizing a transmission curve through a normalized scattering matrix theory; converting the optimized transmission line model into a three-dimensional structure and further optimizing; modeling and calculating the external quality factor Qe in combination with the superconducting cavity; performing secondary electron multiplication effect simulation analysis; performing thermal load analysis by using an iterative process; and finally completing mechanical design.The application adopts the double-inhibition structure, greatly improves the base mode inhibition bandwidth, realizes deep inhibition of the base mode without pre-tuning, significantly reduces the superconducting module integration cost, improves the assembly efficiency and reduces the operation risk.

The application discloses a quality factor enhanced active filter and electronic equipment, and relates to the technical field of integrated circuit band pass filters. The quality factor enhanced active filter comprises a subtraction circuit, a first second-order quality factor enhanced active filter circuit and a second second-order quality factor enhanced active filter circuit which are electrically connected with the subtraction circuit. The first second-order quality factor enhanced active filter circuit and the second second-order quality factor enhanced active filter circuit each comprise variable gain sub-circuits, inductance-capacitance parallel resonance sub-circuits and negative resistance feedback sub-circuits which are electrically connected with each other. The subtraction circuit is connected with the variable gain sub-circuit. The application has the technical effects of a large gain adjustment range, unchanged center frequency points during gain and Q value adjustment, tunable center frequency, good rectangular coefficient and high linearity, and can be integrated and used in radio frequency front-end equipment.

A filter circuit, a filter and a communication device relate to the technical field of communication. The filter circuit includes a series branch connected between the first port and the second port and including a series resonance circuit and a series impedance element connected in series with each other, wherein the series resonance circuit includes a series resonator; and a parallel branch connected between a parallel node and a ground potential and including a parallel resonance circuit and a parallel impedance element connected in series with each other, wherein the parallel resonance circuit includes a parallel resonator, and the parallel node is located on a connection path of the first port and the second port; wherein the resonance frequency of the series resonator is less than the resonance frequency of the parallel resonator.

The application discloses a battery heating circuit, a control method and a controller, a battery system and a power consumption device. The battery heating circuit comprises a battery, a resonance capacitor and a bridge arm. The battery has a battery inductance. The resonance capacitor is connected in parallel with the battery to form an LC parallel resonance circuit with the battery inductance. The bridge arm is connected in parallel with the battery. The bridge arm comprises a first bridge arm switch tube and a second bridge arm switch tube connected in series.

The embodiment of the invention provides a harmonic suppression device and electronic equipment. According to the device, the transformer is connected, the primary winding of the transformer is connected with the motor winding in series, the secondary winding side of the transformer is connected with the parallel resonance circuit, the current of the resonant frequency in the secondary winding is suppressed, and the current of the resonant frequency in the primary winding is also suppressed, so that the current of the resonant frequency in the motor winding is suppressed; therefore, the suppression of the motor current switch ripple can be realized only by setting the resonant frequency of the parallel resonant circuit connected to the secondary winding according to the switch ripple frequency, and compared with the traditional scheme of increasing the power device and improving the topology complexity, only the transformer and the resonant circuit need to be added, the hardware structure is simple, and the cost is remarkably reduced.

The invention discloses a three-phase four-bridge-arm inverter control method and device based on multi-quasi-PR parallel resonance, terminal equipment and a storage medium, and relates to the field of inverter control, and the method comprises the steps: carrying out the proportional scaling of a three-phase voltage error of a three-phase load voltage and a three-phase reference voltage, obtaining a proportional control signal, and carrying out the control of the proportional control signal; carrying out resonance gain amplification on the fundamental wave, the first harmonic wave and the second harmonic wave to obtain corresponding resonance control signals, and carrying out parallel superposition to obtain a current inner loop reference value; determining a three-phase bridge arm output voltage according to the deviation between the current inner ring reference value and the three-phase inductive current in combination with the compensation of the three-phase load current; and according to the three-phase bridge arm output voltage, determining a neutral line bridge arm voltage, further generating a switch control pulse signal of a bridge arm, and controlling the three-phase four-bridge arm inverter. Through the implementation of the invention, the problem of output voltage distortion caused by the fact that PI control is difficult to adapt to a nonlinear load in the prior art is solved, and the output voltage distortion rate under the nonlinear load is reduced.

The invention discloses a high-isolation single-layer microstrip antenna and an array. The antenna structure comprises at least two radiation microstrip patches, two coupling microstrip strips, a dielectric layer, a grounding layer and a gap etched in the grounding layer. The high-isolation microstrip antenna array further comprises a first feed probe and a second feed probe, and the first feed probe and the second feed probe penetrate through the dielectric layer and are connected with the first feed points and the second feed points of the two radiation patches respectively. And the coupling microstrip strip is in capacitive coupling with the patch, and parallel resonance is formed at a required resonance frequency point, so that electromagnetic coupling between the first feeding point and the second feeding point is inhibited. The gaps etched on the grounding layer are located among the units, so that the isolation of the antenna array can be further improved. High isolation between patch arrays can be achieved under the condition that patch characteristic impedance is hardly affected, and meanwhile the patch array has the advantages of being single in layer, small in size and simple in structure.

Provided are an antenna device and an electronic apparatus making it possible to reduce the impact that a filter circuit makes on antenna characteristics, in a case where a radiating element and the filter circuit are not connected. An antenna device (100) of the present disclosure comprises: a radiating element (11) to which a power supply circuit (30) is connected; and an impedance adjustment circuit (10) connected to the radiating element (11). The impedance adjustment circuit (10) includes: a switching circuit for switching the path, among a plurality of paths that include a first path (10a) and a second path (10b), for connecting to the radiating element (11); a filter circuit (20) provided to the first path (10a); and an impedance adjustment element (40) provided to the second path (10b). The filter circuit (20) is a parallel resonance circuit including at least two magnetically coupled inductance elements.

An elastic wave device chip includes a chip substrate; a plurality of series resonators formed on a first main surface of the chip substrate; a plurality of parallel resonators formed on the first main surface of the chip substrate; an input pad formed on the first main surface of the chip substrate; an output pad formed on the first main surface of the chip substrate; a ground pad formed on the first main surface of the chip substrate; a wiring pattern formed on the first main surface of the chip substrate and electrically connected to the series resonators, the parallel resonators, the input pad, the output pad, and the ground pad; and a broadband attenuation circuit formed on a second main surface of the chip substrate opposite the first main surface and electrically connected to the wiring pattern at a position where two adjacent series resonators on a front half side from one side of the input pad are electrically connected by a first through-hole wiring that penetrates the chip substrate. Thus, an elastic wave device chip or the like that improves filter characteristics and achieves miniaturization can be provided.

The application provides a single-pole single-throw switch based on multi-mode resonance, and a transmission pole and a transmission zero point are generated through a multi-mode resonance unit. When the switch is turned on, a first loading capacitor, a first series diode and a second loading inductor generate series resonance, thereby generating a transmission pole. Through parallel resonance of the first loading capacitor, the first series diode and the second loading inductor, an additional transmission zero point is generated in the band. When the switch is turned on, a second transmission pole is generated through a low-pass circuit formed by the multi-mode resonance unit and a second parallel diode. The bandwidth is expanded, and the isolation of the switch is increased. The effect of multi-mode resonance is realized through multiplexing of the first loading capacitor, the first loading capacitor participates in series resonance in the on state and participates in parallel resonance in the off state, and the first loading capacitor participates in direct current bias as a direct current blocking capacitor. The application realizes excellent performance of the switch in terms of insertion loss, isolation and bandwidth, and ensures miniaturization.

An elastic wave device includes a transmitting filter having a transmitting bandpass and a receiving filter having a receiving bandpass, the transmitting filter including a plurality of series resonators and a plurality of parallel resonators, at least one of the series resonators having a same anti-resonance frequency as a highest frequency of the receiving bandpass. Thereby, an elastic wave device of a smaller size and excellent isolation characteristics, and a module including the elastic wave device are provided.

The present invention provides an antenna device and an electronic apparatus that make it possible to achieve a small size and a wide bandwidth. An antenna device (100) according to the present disclosure comprises: a first radiation element (11) to which a power supply circuit (30) is connected; a second radiation element (12) at least one end of which is open; and a filter circuit (20) which is provided at an intermediate portion of the second radiation element (12). The first radiation element (11) and the second radiation element (12) are electromagnetically coupled. The filter circuit (20) includes a plurality of inductance elements, at least two of which are magnetically coupled to constitute a parallel resonance circuit.

The invention provides a harmonic filter integrated in an ultra-short wave power amplifier in a matching manner by using a load traction technology, which comprises the following steps: setting different frequency points for a broadband power amplifier, and determining target impedance values corresponding to the different frequency points based on a preset test condition by combining the load traction technology; determining an input impedance network of the harmonic filter corresponding to the target impedance value according to the target impedance value, and matching an output transmission line corresponding to the input impedance network through impedance conversion by adopting a multi-order elliptical low-pass network model; an elliptical low-pass model is arranged in the harmonic filter, and a transmission zero point is generated through parallel resonance to suppress harmonic waves. According to the method disclosed by the invention, a module cascade matching joint debugging link can be omitted to the greatest extent, functional indexes of the module assembly are correspondingly improved, the volume space is saved, the integrated design is realized, the application, installation and operation are simple and convenient, and the performance is stable and reliable.

The present application relates to the technical field of induction heating power supply, and particularly relates to a real-time dynamic matching circuit for an induction heating power supply. The present application proposes a dynamic load matching circuit for CCL or CCCL series-parallel resonance, which realizes real-time automatic impedance matching by adjusting the working proportion of switch capacitors in the capacitor group online without stopping the machine, thereby replacing the traditional manual adjustment mode and avoiding the problems of slow manual operation speed and easy errors. In addition, due to the online dynamic matching function, the circuit can complete parameter adjustment without stopping the system operation, and is suitable for occasions with high requirements for process continuity. This effectively avoids the problem of large fluctuations in the furnace temperature caused by shutdown maintenance and restart of the induction heating power supply, and is beneficial to maintaining process stability. At the same time, through the configurable capacitor group design, the circuit can realize a wider load matching range and adapt to diversified application requirements.

The application discloses a high-isolation semiconductor single-pole double-throw switch based on a transmission zero point and belongs to the technical field of basic electronic circuits. The switch comprises a first radio frequency port, a first switch arm, a second switch arm, a second radio frequency port and a third radio frequency port, each of the switch arms comprises at least one parallel resonance unit, one parallel resonance unit and one output matching module, and the parallel resonance unit is connected in series between the input end of the switch arm and the source of the parallel transistor, so that the transmission zero point is realized in the off branch and the transmission pole is generated in the on branch of the parallel resonance loop and the parallel transistor, and the isolation degree is effectively improved while the switch is kept small.

A non-contact power supply system (10) comprises: a power supply device (20) that supplies power in a non-contact manner; and a power reception device (30) that receives power in a non-contact manner. The power supply device (20) has a parallel resonance circuit (22) and a drive switch element (SW0). The power reception device (30) has a series resonance circuit (32), a rectifier circuit (33), and a control circuit (40). The control circuit (40) has a first mode in which, with respect to a second rectification switch element (SW2) and a fourth rectification switch element (SW4) that constitute the rectifier circuit (33), the time from turning on to off is changed with reference to the zero-cross point of an AC current generated in the series resonance circuit (32), thereby changing the duration during which the second rectification switch element (SW2) and the fourth rectification switch element (SW4) are simultaneously turned on and adjusting the power supplied to a load (60).

The application discloses a high-isolation radio frequency switch circuit based on parasitic parameter compensation and belongs to the technical field of radio frequency switch circuits. The circuit comprises an input end, a first output end, a second output end, two impedance conversion sections, two output transmission lines and two parallel branches. The input end is connected to one end of the two impedance conversion sections through a common node, and the other end of the impedance conversion section is connected to a T-shaped junction node. Each T-shaped junction node is connected to the first output end and the second output end through the output transmission line. One end of the parallel branch is connected to the T-shaped junction node. The parallel branch comprises a compensation stub and a PIN diode connected in series. The microstrip line structure at the T-shaped junction node is configured to introduce a parallel capacitor to form parallel resonance with the parallel branch in a conducting state.

The invention discloses a high-isolation radio frequency switch circuit based on parasitic parameter compensation, and belongs to the technical field of radio frequency switch circuits. The circuit comprises an input end, a first output end, a second output end, two impedance conversion sections, two output transmission lines and two parallel branches, the input end is respectively connected to one ends of the two impedance conversion sections through a common node, and the other ends of the impedance conversion sections are respectively connected to a T-shaped node; each T-shaped node is respectively connected to a first output end and a second output end through the output transmission line; one end of the parallel branch is connected to the T-shaped node; the parallel branch comprises a compensation stub line and a PIN diode which are connected in series; the microstrip line structure at the T-node is configured to introduce a shunt capacitance to form a parallel resonance with the parallel branch in a conducting state.

The invention relates to the technical field of communication equipment, in particular to a decoupling radiation unit, a multi-frequency common-aperture array and a base station antenna. The invention provides a decoupling radiation unit, which is based on the fusion of various decoupling technologies, and is characterized in that a resonance ring is arranged at the strongest induction current of a radiation oscillator arm, and a frequency point is formed by virtue of the resonance characteristic of the resonance ring; first branches are arranged on the two sides of a current secondary strong position, the first branches and the radiation arms jointly form an LC parallel resonance structure with low-pass and high-resistance characteristics, self work of the unit is not interfered, and a second frequency point is formed; meanwhile, metal patches are additionally arranged in the annular oscillator arms to form a frequency selective surface structure, a third frequency point is provided on the premise that the performance of the low-frequency antenna is not affected, and wide-frequency-band wave-transparent regulation and control are achieved through multi-frequency-point collaborative superposition. The unit achieves the broadband wave transmission characteristic through multi-technology fusion, and the wave transmission performance can be flexibly adjusted according to actual application requirements while the decoupling effect is achieved, so that the unit is adaptive to the use requirements of different scenes.

The invention provides a band elimination filter based on an HTCC, and the filter comprises a laminated body, the laminated body comprises a plurality of dielectric layers which are arranged in a laminated manner, and the outer surface of the laminated body is provided with an input end, an output end, and a grounding end. A first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor are arranged in the laminated body, the first inductor and the first capacitor are connected in parallel to form a first parallel resonance unit, and the second inductor and the second capacitor are connected in parallel to form a second parallel resonance unit; the first parallel resonance unit and the second parallel resonance unit are connected between the input end and the output end in series, and one end of the third parallel resonance unit is connected to the joint of the first parallel resonance unit and the second parallel resonance unit. The other end of the third parallel resonance unit is connected with the grounding end through a fourth capacitor; two adjacent annular electrodes in the third inductor are connected through an electrode part, so that the third inductor is of a three-dimensional gyroscope structure.

A filter circuit, a filter, and an electronic device are disclosed. The filter circuit includes: a first port and a second port arranged opposite to each other, a grounding terminal, a series branch between the first port and the second port, and at least one parallel branch connected with the series branch; where the series branch includes at least one series resonance unit arranged in sequence, each of the at least one parallel branch includes a parallel resonance unit, and the parallel resonance unit is connected with the grounding terminal.

The utility model provides a wireless charging coil magnetic field intensity visual display device, and relates to the field of wireless charging coil magnetic field detection. The wireless charging coil magnetic field intensity visual display device provided by the utility model comprises a bottom plate and a plurality of coil assemblies, and the coil assemblies are arranged on the bottom plate in an array; the coil assembly comprises a printed circuit board, a light-emitting diode and at least one capacitor are arranged on the front face of the printed circuit board, the capacitor and the light-emitting diode are connected in parallel through a wire and form an LC parallel resonance circuit, the resonance frequency of the LC parallel resonance circuit is the same as that of an external magnetic field to be measured, and the light-emitting diode is used for displaying the magnetic field intensity of an external magnet. The device can directly observe the external magnetic field intensity and range to be measured, is low in cost, can be produced in batches, and is simple and convenient to use.

This invention provides a design method for bulk acoustic wave resonators, filters, duplexers, and multiplexers. The method includes: constructing an original Mason model; extracting a new model from the Mason model that accurately maps the longitudinal wave velocity and material density of piezoelectric materials to parallel resonance; and using the new model to determine the longitudinal wave velocity and material density parameters for design. This design method simplifies redundant parameters, discards irrelevant parameters, sets finite parameters for relatively fixed parameters, and establishes a mapping model for these finite parameters. Therefore, compared to existing technology models, it can more accurately determine material parameters, such as longitudinal wave velocity and material density parameters. Furthermore, this invention also provides a design method for doped bulk acoustic wave resonators. Compared to existing doping design methods, this doping design method can more stably obtain the design parameters of the resonator at the target frequency, and significantly reduces the design cycle and design cost.

A multiplexer includes a common terminal, an inductor including a first end connected to the common terminal and a second end, a filter connected to the second end and having a first pass band, a filter connected to the common terminal and having a second pass band located on a higher frequency side relative to the first pass band, an inductor connected between a ground and a path that links the second end to the filter, and a capacitor connected between the path and the ground. A resonant frequency of an LC parallel resonance circuit including the inductor and the capacitor is located between the first pass band and the second pass band.

The invention discloses an intelligent compensation type capacitive voltage transformer which comprises a low-frequency compensation branch circuit which adopts a series resonance isolation and parallel capacitive compensation structure, a first series resonance inductor L1 and a first series resonance capacitor C1 are connected in series and then are connected with a parallel compensation capacitor Ccomp in parallel, and the series resonance of the L1 to the C1 at a power frequency is realized to realize the transparency of a power frequency signal; capacitive compensation is provided in a low-frequency band through the Ccomp; the power frequency unvarnished transmission branch adopts a parallel resonance selection + series fine adjustment structure, a second parallel resonance inductor L2 and a second parallel resonance capacitor C2 are connected in parallel and then are connected in series with a fine adjustment resistor Rfine, parallel resonance is carried out near the power frequency through the L2-C2 for fine adjustment, and resistive compensation is provided at the power frequency band through the Rfine; and the high-frequency compensation branch circuit adopts a parallel resonance isolation + series inductive compensation structure, a series compensation inductor Lcomp is connected in series with a branch circuit formed by connecting a third parallel resonance inductor L3 and a third parallel resonance capacitor C3 in parallel, parallel resonance is realized at a low-frequency position through the L3-C3 to realize isolation, and inductive compensation is provided at a high-frequency band through the Lcomp.

The application belongs to the technical field of nuclear magnetic resonance logging while drilling, and proposes a nuclear magnetic resonance logging while drilling transmitting device, which comprises a main control acquisition processing module, a driving module, a power pulse transmitting module, an antenna interface module and a high-voltage power supply. The main control acquisition processing module is used for receiving a main control signal, converting the signal and outputting the signal to the driving module as a driving signal. The driving module is used for receiving a front-stage signal and outputting the signal to a rear-stage power pulse transmitting circuit. The power pulse transmitting module lifts up the direct current power supply to generate a pulse meeting the nuclear magnetic resonance transmitting requirement. The antenna interface module adopts parallel resonance, so that the voltage provided by the power transmitting circuit is the resonance voltage for transmitting. The high-voltage power supply provides the required power supply energy for the circuit. The application can be implemented under the conditions of high temperature, high pressure, strong vibration and narrow space, and provides a high-power and high-energy-efficiency radio frequency transmitting circuit for the development of a nuclear magnetic resonance logging while drilling instrument.

The application discloses a signal processing circuit of a displacement sensor, the displacement sensor and a railway vehicle, and relates to the technical field of railway transportation. The signal processing circuit provided by the scheme receives a third clock signal provided by a demodulation circuit at a driving circuit input end, and outputs an excitation signal to a parallel resonance circuit; the parallel resonance circuit generates an original modulation signal accordingly, and sends the original modulation signal to a driving signal input end of the demodulation circuit. The demodulation circuit simultaneously receives first and second clock signals, and performs effective signal interception and regular processing on the original modulation signal. By accurately intercepting the effective signal interval, invalid components, interference components and transition clutter in the original modulation signal can be removed, so that the output waveform is cleaner and the characteristics are more clear. Therefore, the demodulation process is no longer affected by clutter and non-target signals, the final output target demodulation signal has higher linearity, lower noise and smaller zero drift with the measured physical quantity, and the problem of low demodulation accuracy is solved.

The invention provides a characterization method and device for a quality factor frequency response characteristic of a radio frequency resonator, and the method comprises the steps: converting an original reflection coefficient, which changes along with the angular frequency, in the radio frequency resonator into corresponding radio frequency resonator impedance, which changes along with the angular frequency, based on original port reference impedance; determining corresponding series resonance impedance and parallel resonance impedance based on the minimum value and the maximum value of the absolute value of the impedance of the radio frequency resonator in the resonant circular frequency range; taking a geometric mean value of the series resonance impedance and the parallel resonance impedance as a new port reference impedance; based on the radio frequency resonator impedance and the new port reference impedance, obtaining a new reflection coefficient which is updated under the condition of the new port reference impedance and changes along with the angular frequency; and substituting the absolute value and the phase of the updated new reflection coefficient into a quality factor calculation formula, calculating to obtain the frequency response characteristic of the quality factor changing along with the angular frequency, and completing the characterization of the quality factor frequency response characteristic of the radio frequency resonator.

A noise filter according to the present invention has one end electrically connected to a power supply line connecting a power supply and a device, and the other end grounded, and comprises a capacitor and an inductor connected in parallel. The parallel resonance frequency of the capacitor and the inductor is set within a first frequency band including the frequency at which the intensity of common mode noise generated in the device is greatest. The self-resonant frequency of the capacitor is set within a second frequency band including the frequency at which the intensity of normal mode noise generated in the device is greatest.