83 results about "Parallel resonance" patented technology

The invention discloses a current source type LCCL double-frequency resonance system and a parameter matching method thereof, which are suitable for synchronous double-frequency induction quenching of complex workpieces such as gears. The system is composed of two current type resonant inverters working at a low frequency and a high frequency respectively and a dual-frequency LCCL resonant cavity, and dual-frequency current superposition is realized through parallel output. The double-frequency LCCL resonant cavity has two parallel resonance points, a mode based on simplified topology is adopted to simplify parameter design, and meanwhile design errors are maintained at a low level. A power matching coefficient is introduced, the ratio of high-frequency output power to low-frequency output power is adjusted by adjusting the value of the power matching coefficient, and the problem of double-frequency power unbalance caused by frequency variation characteristics of load equivalent resistance and the like is solved. The superposed double-frequency current forms a low-frequency envelope embedded high-frequency oscillation composite waveform on the induction heating coil, cooperative control of tooth root deep quenching (low frequency) and tooth surface hard quenching (high frequency) is achieved, and the method has the advantages of being simple in parameter design, high in power decoupling performance, high in operation stability and the like.

The invention relates to the technical field of radio frequency integrated circuits, in particular to a harmonic suppression power amplifier combining a matching network and a feed network, which comprises a transistor, an input matching module, an output matching module, a stabilizing module and a bias module, the input matching module comprises a first parallel resonance unit, the first parallel resonance unit is used for second harmonic suppression, the output matching module comprises a series resonance unit and a second parallel resonance unit, the series resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic, and the second parallel resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic. The second parallel resonance unit is used for resonating at a third harmonic frequency and forms a high-impedance open circuit for the third harmonic, the output matching module is coupled to a drain electrode of the transistor, and the bias module comprises a grid bias sub-module and a drain bias sub-module. The grid bias sub-module is coupled to a connection node of the input matching module and the grid of the transistor, the drain bias sub-module is coupled to the output matching module, and the bias voltage of the transistor is jointly determined by the grid bias sub-module and the drain bias sub-module. The power amplifier has the effect of improving the efficiency level of the power amplifier while realizing harmonic suppression optimization.

The invention discloses a series-parallel resonance characteristic evaluation method and system, and belongs to the technical field of distributed new energy grid-connected power generation, and the method comprises the steps: analyzing the interaction between all units of a microgrid system based on a transfer function method; the method comprises the following steps: performing series resonance modal analysis and parallel resonance modal analysis on a micro-grid system by using a modal analysis method, and constructing a modal analysis equivalent model; extracting resonance modal information according to the modal analysis equivalent model; a resonance center is positioned based on series-parallel modal analysis, resonance types are distinguished in combination with a transfer function method, and resonance characteristic evaluation is realized. According to the method, the resonance type and the resonance center of the micro-grid system can be accurately obtained in the island operation mode, key information such as the key resonance mode and the node participation factor is extracted, and a theoretical basis is provided for subsequent resonance suppression.

The application discloses a kind of low-loss on-chip transmission lines based on non-periodic composite left-right hand structure, it is related to radio frequency integrated circuit design technical field, including first radio frequency port, second radio frequency port, M series resonance unit and N parallel resonance unit, each series resonance unit includes series right-hand inductance, left-hand capacitance, each parallel resonance unit includes parallel left-hand inductance, right-hand capacitance;M series resonance unit is in turn connected in series, one end of N parallel resonance unit is in turn loaded between two series resonance units, and the other end of parallel resonance unit is grounded, first radio frequency port is loaded in the free end of first series resonance unit, and second radio frequency port is loaded in the free end of M series resonance unit.The application uses non-periodic lumped transmission line to avoid too large size;While maintaining low loss, echo loss in broadband is all better than 20dB.

The present application relates to the technical field of resonance analysis, and in particular to a method and device for evaluating effectiveness of a parallel resonance suppression scheme in a power system. In the present application, a local parallel resonance suppression evaluation index and a non-local parallel resonance suppression evaluation index are constructed, and corresponding feasible regions are constructed, so as to evaluate the parallel resonance suppression effect of a resonance suppression method access node and the effect of parallel resonance of surrounding other nodes. The present application solves the problem that the application scene of a resonance suppression method is limited and the parallel resonance scene is not compatible with the resonance suppression method.

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 invention discloses a resonance circuit, a power supply module and V2G charging equipment, and relates to the field of charge and discharge control, the resonance circuit is applied to a bidirectional DC-DC conversion circuit of the power supply module, when a power grid charges an electric load through the power supply module, parallel resonance is formed between a first inductor and a first capacitor, and between a second inductor and a second capacitor; the influence of electricity load change on the circuit stability is reduced, and the circuit stability is improved; when the electric load discharges to the power grid through the power supply module, series resonance is formed between the first inductor and the first capacitor and between the second inductor and the second capacitor, the frequency stability is high, the harmonic content of grid-connected current is low, and the quality of electric energy fed back to the power grid is high. According to the scheme, automatic switching between series resonance and parallel resonance can be achieved according to the current charging and discharging state, and bidirectional energy transmission between the electricity load and the power grid can be better achieved.

The present disclosure provides a filter device capable of obtaining good characteristics even when an attenuation band based on parallel resonance is brought close to a passband based on series resonance. A filter device (100) according to the present disclosure is provided with: a first terminal (P1); a second terminal (P2); a first inductor (L1); and a series resonator (RS) disposed in the first path (TL1) among the first path (TL1) and the second path (TL2) provided in parallel. The series resonator (RS) includes: a second inductor (L2); a capacitor (C2) connected in series with the second inductor (L2); and a third inductor (L3) connected in series with the second inductor (L2) and the capacitor (C1). The magnetic coupling of the first inductor (L1) with the third inductor (L3) is weaker than the magnetic coupling of the first inductor (L1) with the second inductor (L2).

The invention discloses an FBAR structure with a multi-edge resonant structure and a manufacturing method. The FBAR structure comprises a core resonance structure and an edge structure, and the edge structure comprises a first edge resonance structure and a second edge resonance structure which are alternately distributed at the edge of the core resonance structure in the direction perpendicular to the thickness direction of the resonance area. And the first edge resonance structure, the second edge resonance structure and the core resonance structure adopt continuous piezoelectric layers. The bottom electrodes and the top electrodes of the first edge resonance structure and the second edge resonance structure are symmetrically arranged relative to the piezoelectric layer, and each of the bottom electrodes and the top electrodes is composed of two layers of electrodes made of different materials. By adjusting the thickness of each electrode, the series resonance frequencies of the core resonance structure, the first edge resonance structure and the second edge resonance structure are equal, the parallel resonance frequencies of the core resonance structure, the first edge resonance structure and the second edge resonance structure are equal, the offset of the parallel resonance point frequency is reduced, and the quality factor of the FBAR is improved.

Antenna device comprising: a ground plate (10) made from a conductor with a flat plate shape; an opposing conductive plate (20) made of another conductor with a flat plate shape is arranged to be spaced apart from the ground plate (10) by a predetermined distance and has a power supply point which is electrically connected to a power supply line; a short-circuit section (40) that electrically connects the opposite conductive plate (20) and the ground plate (10); and a radio wave shielding body (60) for shielding against the propagation of an electric field, which is arranged on a top side of the opposite conductive plate (20) and is made of a conductor or a dielectric material, wherein: a parallel resonance at a predetermined target frequency is generated by an inductance provided in the short-circuit section (40) and a capacitance between the ground plate (10) and the opposite conductive plate (20), and wherein the ground plate (10) and the opposite conductive plate (20) are arranged on a carrier plate (30) made of resin material, the antenna device further comprising: a resin housing (90) for receiving the carrier plate (30), wherein: the resin housing (90) includes a housing top plate section (93) which is arranged above the opposite conductive plate (20); and the housing top plate section (93) includes an edge contact section (931) which contacts an edge section of the opposite conductive plate (20).

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 canceler device includes: a line connector having a first terminal, a second terminal, and a third terminal, the line connector being configured to output a signal provided to the first terminal to the second terminal; and a reflection circuit to output a reflected wave of the signal output to the second terminal to the third terminal. The reflection circuit includes: a first variable resistor having a first end connected to the second terminal; a second variable resistor having a first end connected to the second terminal and a second end grounded; and a parallel resonance circuit having a first end connected to a second end of the first variable resistor and a second end grounded.

According to the laminated chip duplexer equivalent circuit for the 5G terminal and the duplexer thereof, on the basis of the LTCC low-temperature co-fired ceramic technology, the special electrical performance requirement of the novel laminated chip duplexer for the 5G terminal is met through lumped parameter model design, a transmission zero point is introduced outside a low-frequency passband through parallel resonance at the low frequency, out-of-band rejection is enhanced, and the low-frequency band pass-band pass-band rejection is improved. The high-frequency band forms a transmission zero point at the passband low-frequency band by introducing the bridging capacitor, the suppression capability of the high-frequency passband at the low frequency is enhanced, and in addition, the passband range of the high-frequency band is simply and effectively widened by introducing the series inductor at the high-frequency port. Frequency division of low-frequency signals and high-frequency signals is effectively achieved, the high-frequency passband bandwidth is effectively widened, passing of the 5G frequency band N77 and N79 frequency bands is met, and the frequency divider has the advantages of being low in loss, high in suppression, high in isolation, high in reliability, low in cost, good in consistency, suitable for large-scale production and the like. And in addition, the novel electronic component integration and miniaturization development trend is also adapted.

The invention relates to parallel resonance, in particular to a transformer substation high-voltage system power transmission line lumped parameter parallel resonance identification method, which comprises the following steps of: synchronously monitoring a high-voltage side, a medium-voltage side and a low-voltage side of a main transformer to obtain a harmonic voltage content array, a harmonic current content array and a fundamental wave reactive power array; according to the main transformer low-voltage side fundamental wave reactive power array, selecting a target time period in which reactive power changes frequently; within the target time period, a first correlation coefficient between the main transformer medium-voltage side h-order harmonic voltage content array and the main transformer high-voltage side h-order harmonic current content array is calculated, and a second correlation coefficient between the main transformer medium-voltage side h-order harmonic voltage content array and the main transformer medium-voltage side h-order harmonic current content array is calculated; identifying the resonance state of the high-voltage side of the main transformer based on the first correlation coefficient and the second correlation coefficient; the method can effectively overcome the defect that the lumped parameter parallel resonance of the power transmission line of the high-voltage system of the transformer substation is difficult to accurately identify due to CVT harmonic measurement distortion.

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 invention discloses a parallel resonance induction heating power supply based on inversion PWM power regulation and a control method, and belongs to the technical field of induction heating. The power supply comprises an uncontrolled rectification module, an inversion module, an inductance conversion unit, an LC parallel resonance circuit and a digital control module. The uncontrolled rectifier module converts alternating current into direct current, the inverter module outputs high-frequency voltage through PWM modulation, and the LC parallel resonant circuit is driven after a voltage source is converted into a current source through the inductance conversion unit; and the digital control module adopts a DSP + CPLD architecture to realize frequency tracking, power closed-loop control and PWM signal generation. The invention solves the problems of low power factor and large harmonic wave of the traditional parallel resonance rectification phase shift voltage regulation mode, overcomes the defects of high cost and large energy consumption of direct current chopping power regulation, and has the advantages of high power factor (gt, 0.95), small harmonic wave pollution, high control precision (+ / -1%) and wide adaptive power range (5%-100%).

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.

To suppress the occurrence of parallel oscillation when a plurality of switching elements are simultaneously operated.SOLUTION: The first lower arm transistor 11L and the second lower arm transistor 12L are connected in parallel to each other. The parallel resonance circuit of the first lower arm transistor 11L and the second lower arm transistor 12L has a first pole frequency ω p1, a second pole frequency ω p1 higher than the first pole frequency ω p2, and a zero point frequency ω z. The absolute values of the phase delay at the second pole frequency ω p2 and the zero point frequency ω z are set to be smaller than 180 °.SELECTED DRAWING: Figure 1

The utility model relates to a treatment device and a radio frequency beauty instrument using the same, the treatment device comprises a detachable cold air tank, a control module, a touch screen, a radio frequency power amplification circuit, an automatic boost-buck power supply module, a power supply module and a switching interface, the control module is electrically connected with the touch screen and the automatic boost-buck power supply module; the input end of the radio frequency power amplification circuit is connected with the output end of the automatic buck-boost power supply module, the output end of the radio frequency power amplification circuit is connected with the adapter interface, and the radio frequency power amplification circuit is a symmetrical series-parallel resonance circuit and comprises a high-frequency isolation transformer, a third inductor, a capacitor and a parallel resonance circuit. The input end of the parallel resonance circuit is connected with the output end of the automatic buck-boost power supply module, the parallel resonance circuit is composed of a first circuit and a second circuit which are arranged in parallel, and each of the first circuit and the second circuit comprises a universal capacitor, a resonant capacitor, a switching tube and an inductor. The capacitor, the general capacitor, the resonant capacitor, the switching tube and the third inductor form a resonant cavity of the whole circuit topology.

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.

The invention provides an LTCC-based low-pass filter, which comprises a laminated body and an inner electrode arranged in the laminated body, and is characterized in that the laminated body is provided with an input end, an output end and a grounding end; the inner electrode comprises a first inductor, a second inductor, a first capacitor, a second capacitor and a third capacitor; the first inductor and the third capacitor form a parallel resonance branch; the second inductor, the first capacitor, the second capacitor and the grounding end form a series resonance branch; the parallel resonance branch and the series resonance branch are connected in parallel between the input end and the output end; the working frequency band of the low-pass filter based on the LTCC is 10 MHz to 915 MHz, and the low-pass filter based on the LTCC achieves the purposes of being small in-pass-band insertion loss, high in out-of-band rejection and small in size within the working frequency band of 10 MHz to 915 MHz.

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.

The application provides a parallelly connected bulk acoustic resonator, comprising a substrate, a laminated structure sequentially comprising an upper electrode, a piezoelectric layer and a lower electrode on the substrate, an acoustic reflection structure below the laminated structure, formed in the substrate or between the laminated structure and the substrate, and an effective working area of the laminated structure formed by the overlapping area of the upper electrode, the piezoelectric layer and the lower electrode above the acoustic reflection structure, which comprises a main area and at least one local area, the thickness of at least one layer of the upper electrode, the piezoelectric layer and the lower electrode in each local area is different from the thickness of the corresponding layer in the main area, and the series resonance frequency of the resonance response generated by each local area is lower than the series resonance frequency of the resonance response generated by the main area or higher than the parallel resonance frequency of the resonance response generated by the main area. The application also provides an electronic device. The bulk acoustic resonator provided by the application is equivalent to the parallel structure of two or more bulk acoustic resonators.

The invention provides a single-pole single-throw switch based on multimode resonance. A transmission pole and a transmission zero are generated through a multimode resonance unit. When the switch is turned on, the first loading capacitor, the first series diode and the second loading inductor generate series resonance, and a transmission pole is generated. Through parallel resonance of the first loading capacitor, the first series diode and the second loading inductor, a transmission zero point is additionally generated in a band. When the switch is turned on, a low-pass circuit is formed through the multimode resonance unit and the second parallel diode to generate a second transmission pole. The bandwidth is expanded, and the isolation degree of the switch is increased. The multi-mode resonance effect is achieved through multiplexing of the first loading capacitor, the first loading capacitor participates in series resonance in an on state and parallel resonance in an off state at the same time, and the first loading capacitor serves as a blocking capacitor to participate in direct current bias. According to the invention, excellent performance of the switch on insertion loss, isolation and bandwidth is realized, and meanwhile, miniaturization of the size is ensured.

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.

A non-contact power supply system (10) comprises: a power supply device (20) that supplies power in a non-contact manner; and a power receiving device (30) that receives the power supplied from the power supply device (20) in a non-contact manner and supplies the power to a load (60). The power supply device (20) has a parallel resonance circuit (22) and a driving switch element (SW0) that are connected to a direct current power supply (50). The parallel resonance circuit (22) includes a first capacitor (C1) and a first coil (L1). The power receiving device (30) has: a series resonance circuit (32) that is composed of a second capacitor (C2) and a second coil (L2) that is magnetically coupled to the first coil (L1); and a rectifier circuit (33) that is connected to the series resonance circuit (32) and includes at least one rectifying switch element (SW1 to SW4) that rectifies alternating current power generated in the series resonance circuit (32).

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.