160results about How to "Wide operating frequency range" patented technology

The invention discloses a quick locking type digital time delay lock loop circuit and relates to the technology of signal phase deviation. The digital time delay lock loop circuit comprises a duty ratio adjusting circuit, a phase discriminator, a digital control time delay chain, a digital time converter, a shift counter and a replication time delay unit, wherein the digital control time delay chain comprises at least four levels of identical time delay units, all time delay units are controlled by the same controller and has the same time delay quantity; and each level of time delay units comprises a coarse tuning time delay unit and a fine tuning time delay unit, and the coarse tuning time delay unit and the fine tuning time delay unit are connected in series to expand the working frequency range of the delay lock loop. The digital time delay lock loop circuit provides an accurate 90-degree phase shift signal to a DQS (Data Strobe Signal) signal in a DDR (Data Direction Register) controller and has the properties of quickly locking and avoiding wrong lock of the loop.

The invention discloses an optical fiber vibration sensing head, which consists of a vibration sensitive chip, a dual fiber collimator and an encapsulation shell, wherein the inside of the encapsulation shell under the dual fiber collimator is provided with a cavity, the vibration sensitive chip is arranged in the cavity and consists of micro light reflector, a silicon supporting frame and a substrate glass sheet; the silicon supporting frame is bonded with the substrate glass sheet; the micro light reflector is arranged in the silicon supporting frame; a damping air cavity is reserved between the micro light reflector and the substrate glass sheet; two sides of the micro light reflector is symmetrically provided with torsion shafts; and one end of each of the torsion shaft is connected with the silicon supporting frame. An MEMS process is used to integrate a MEMS vibration sensitive chip. Based on an asymmetric torsion micro light reflector structure, the MEMS vibration sensitive chip can be manufactured in batch. The torsion shafts are used as elastic elements, and the micro light reflector is used as a sensitive mass block to reflect vibration acceleration. The damping air cavity is used for controlling the damping characteristic of torsion. The invention has the advantages of batch production, low cost and high consistency.

The invention relates to a method and a device, which conducts super-fast time identification and measurement to seed optical signal. The method essentially includes the following steps: (1) super short laser pulse produced by a laser pulse light source is split into two paths by an optical beam splitting system after energy regulation, collimated beam narrowing and spatial filtering system optimization and selection, among which one path passes a time delay control system and a parameter pump pulse optical path, and the other path passes a seed exciting pulse optical path; (2) the collected seed optical signal and the pump pulse incident into a parameter amplifying system, so that the parameter amplifying system conducts ultra fast amplification to the sample seed optical signal under a linear amplifying state; (3) a parameter amplifying signal detecting system is used to detect, record, refer to and revise the signal, and give corresponding detecting result to ultra fast spectra analysis and time identification and measurement of amplifying the seed optical signal. The invention can amplify the weak seed optical signal and realize detection of ultra fast time identification, and is a novel detecting method in the field of ultra fast spectroscopy.

The invention discloses a broadband, low-loss and high-balance-degree on-chip Balun. The broadband, low-loss and high-balance-degree on-chip Balun is provided with four regular-octagon plane spiral coils which are shaped like disc-like mosquito coils, the four regular-octagon plane spiral coils comprise two balance coils and two unbalance coils, the balance coils are arranged at the upper part, the unbalance coils are arranged at the lower part, an insulation layer is arranged between the balance coils and the unbalance coils, and an unsymmetrical broadside coupling structure is formed by the balance coils and the unbalance coils; an outer end point of a balance coil with narrower line width is used as an input, an outer end point of a balance coil with wider line width is suspended in the air, and inner end points of the two balance coils are connected through a metal guide line; and outer end points of the two unbalance coils are connected to input reference ground, inner end points of the two unbalance coils are respectively led out for being used as two outputs of a converter, and output reference ground and the input reference ground are connected through isolating lines of the balance coils and the unbalance coils.

The invention discloses a photon frequency doubling microwave signal phase shift device. The device comprises a fundamental frequency radio frequency signal source, a photoelectric modulation module, a polarization analyzer and a photoelectric detector, wherein the photoelectric modulation module is used for carrying out electro-optical modulation on a fundamental frequency signal; a modulation light signal which is output by the photoelectric modulation module consists of two polarization orthometric optical signals with phase position difference kpi +pi / 2, the two optical signals are both + / -1 order sideband signals subjected to carrier suppression, +1 order sideband and -1 order sideband of one optical signal are identical in phase, +1 order sideband and -1 order sideband of the other optical signal are different in phases, and the amplitudes of the +1 order sidebands and the -1 order sidebands of the two optical signals are respectively equal, wherein k is an integer. The invention also discloses a phase shift control method of the device. According to the photon frequency doubling microwave signal phase shift device and the phase shift control device of the device, the continuous phase control on a frequency doubling microwave / millimeter wave signal is realized, and the phase control with high performance and high frequency is realized.

A directional bridge coupler includes a coaxial balun having a coaxial cable with a plurality of ferrite beads disposed about an outer conductor of the coaxial cable, and a circuit substrate accommodating a directional bridge coupled to an output of the coaxial bridge. A conductive package having an internal cavity houses the circuit substrate and the coaxial balun. A polyiron saddle straddles a portion of the coaxial balun within the internal cavity of the conductive package.

A digital controlled oscillator including a programmable current source, a first variable capacitor and a second variable capacitor. A comparator compares the voltage across the variable capacitors with a reference voltage level and generates a DCO output clock signal. A switching means alternately switches the variable capacitors to either charge from a programmable current source or discharge in response to an output signal of the comparator. A clock divider divides the DCO output clock signal by a factor N substantially greater than 1. A frequency monitor receives the divided clock signal, determines the time difference of successive clock periods of the divided clock signal and generates a feedback signal to adapt the frequency of the DCO output clock signal.

The invention relates to an intelligent flow meter adopting a TMR (Tele Meter Reading) magnetic sensor, comprising a TMR flow meter sensor, a flow meter shell, a rotational impeller, a rotational impeller stand, a small magnet with an upward N pole, a small magnet with an upward S pole, a flow meter inlet / outlet, a magnetic shielding layer and a protection layer isolated a flow meter chip from fluid. When fluid to be measured exists, the measured fluid drives the rotational impeller to rotate so as to drive the small magnet with the upward N pole and the small magnet with the upward S pole to rotate simultaneously, and the TMR magnetic sensor induces a magnetic field so as to achieve the purpose of metering. The invention has the advantages of tiny power consumption, wide working frequency range and working temperature range, firm structure, small size, long service life, convenient installation, shock resistance, clear output wave shape without vibration, high position repeating accuracy, simple electromagnetic shielding structure, reverse rotation error prevention calculation, and the like.

The invention discloses a multi-frequency common base station antenna comprising a reflection plate, a low-frequency radiating unit and a high-frequency radiating unit which are arranged on the reflection plate and a dual-frequency combiner which is connected with the high-frequency radiating unit. The dual-frequency combiner is connected with the high-frequency oscillators in the two arrays of the target high-frequency radiating unit in the high-frequency radiating unit in a one-to-one way to multiplex the high-frequency oscillators. The feeding end of the dual-frequency combiner is connectedwith the feeder network corresponding to the two frequency bands of the target high-frequency radiating unit. Therefore, the high-frequency oscillators are multiplexed by the dual-frequency combinerso as to realize a wider working frequency range without increasing the size of the reflection plate, and thus the volume and the size of the antenna are small and the antenna meets the requirements of miniaturization and multi-frequency of the antenna.

The present invention discloses a radio frequency differential-to-single-ended converter, the basic forms of the converter is separated to two types of N type and P type which are respectively realized with N-type transistor and P-type transistor. The N-type converter combines with the P-type converter and forms a push-pull type radio frequency differential-to-single-ended converter; wherein, the outputs of N-type converter and the P-type converter are respectively coupled to the output end Vo by the intercourse of the capacitances of C1 and C2; the input end is shared, namely a transistor M1 of the N-type converter and a transistor M4 of the P-type converter use one input end Vi+, a transistor M2 of the N-type converter and a transistor M3 of the P-type converter use one input end Vi-; and the push-pull type radio frequency differential-to-single-ended converter is formed. The invention has the advantages of wide scope of working frequency, providing additional gain, high efficiency, proportional load at two differential circuits, good linearity and easily integrating on the chip.

The invention discloses a two-stage sliding valve type electro-hydraulic servo valve directly driven by a limited angle torque motor. The two-stage sliding valve type electro-hydraulic servo valve has multiple advantages of high output power, wide frequency band, high reaction and the like. The invention provides an overall structure of a two-stage sliding valve type electro-hydraulic servo valve device directly driven by the limited angle torque motor. The system mainly comprises five parts, namely the limited angle torque motor, the two-stage sliding valve type electro-hydraulic servo valve, a controller, a position sensor and a transmission shaft, wherein the transmission device adopts an eccentric mechanism, so that rotating motion of the limited angle torque motor can be converted into linear motion of the transmission shaft, and a precursor-type valve core of the two-stage sliding valve type electro-hydraulic servo valve is controlled; the control part adopts closed-loop control; the position sensor is used for feeding back information to the controller in real time, and the motion of the valve core can be corrected in real time. By the limited angle torque motor for driving, the valve is lower in hysteresis and higher in resolution; the working frequency range of the two-stage sliding valve type electro-hydraulic servo valve can be expanded, and the response speed is increased.

The invention discloses a laminated-type ceramic radio-frequency low pass filter and a preparation method therefor. The low pass filter comprises four leading-out terminal electrodes and an inner circuit, wherein the electrodes are the input terminal positive electrode, the output terminal positive electrode and two common grounding terminals in sequence; and the inner circuit comprises an inner electrode which is formed by a plurality of built-in capacitors and a plurality of built-in inductors located in the three-dimensional spaces of different dielectric layers. The inductors are in vertical three-dimensional helical structure; and the dielectric layers of the inductors and the capacitors utilize high-frequency low-loss ceramic materials. According to the filter, the dielectric material layers are the high-frequency ceramic material layers; the capacitance and inductance of inner components can achieve minimal adjustment, and a monolithic structure can be realized easily; the preparation technology is mature; consistency is good; the filter is suitable for volume production; and therefore, the low pass filter has the advantages of high cut-off frequency, wide operating frequency range, high out-of-band rejection, good rectangular degree, high reliability and good radio-frequency usage consistency and the like.

The invention discloses a local resonance type acoustic metamaterial focusing lens and a design method thereof, which belong to the field of acoustic engineering. The local resonance type acoustic metamaterial focusing lens is an artificial periodic acoustic structure composed of a base body, a plurality of local resonance type scatterer units and a base, wherein the base body material can be airand water, each scatterer unit is in a cruciform shape, the peripheral contour of the periodic array structure formed by the scatter units is in an elliptical shape, and the periodic array structure is arranged on the base. The local resonance type acoustic metamaterial focusing lens and the design method thereof utilize the basic principle of photonic crystal local resonance in combination with anew structural form, so that the acoustic focusing lens disclosed by the invention can achieve good acoustic wave focusing effect in various media and a wide low-and-medium frequency range when compared with the existing acoustic focusing lens.

The invention discloses a terahertz waveguide polarization attenuating device, comprising a housing, an electromagnetic wave transceiving unit arranged in the housing, a first off-axis paraboloid mirror, a second off-axis paraboloid mirror, a polarization grid, a turntable and a microwave absorbing assembly. The device has the advantages of wide working band range, large attenuation dynamic range,high attenuation precision and large bearing power, and each module of the device can be conveniently disassembled. In the case of large frequency range span, the module can be simply replaced to form the attenuation device in the required frequency band.

A phase-locked loop (PLL) and a method for calibrating a VCO therein are provided. The PLL comprises a frequency-phase detector, a charge pump, a loop filter, a VCO, a divider and a calibration circuit. The calibration circuit is used to acquire a frequency of an output signal of the VCO, to calibrate the frequency of the output signal according to an expected frequency, and to acquire frequency control parameters of the VCO at the current signal frequency. The amplitude and gain of the output signal are kept constant according to the amplitude control parameters and gain control parameters. The PLL can meet the demands on frequencies of multiple protocols and can adaptively look up and stabilize the suitable frequency. It solves the issue that the amplitude of the output signal of the VCO is not constant when the PLL operates in a large frequency range.

The invention relates to a three-dimensional gradient periodic structure plate with multiple band gap characteristics. The three-dimensional gradient periodic structure plate comprises a multi-layer solid plate base body, and m rows and n columns of short scatterer columns which are arranged to be raised in each layer of plate according to periodicity or quasi-periodicity. Therefore, a plurality of groups of periodic structure plates with short columns are stacked to form the three-dimensional periodic structure plate. The radius or the side length of the raised short columns on the same layerof the plates can be unchanged or can be gradually changed in the row or column direction according to a certain function rule. In the height direction, the height, radius or side length of each layer of raised short columns is gradually reduced or increased according to a certain function rule to form the three-dimensional gradient periodic structure plate. Each layer of the periodic structure plate has a respective band gap characteristic. That means, elastic waves or sound waves in certain frequencies are significantly suppressed when propagating in the plate. The periodic structure can realize the integrated design of the structure and the vibration isolation system. The structure plate has the advantages of light weight, wide vibration isolation frequency, high reliability and the like. The structure plate has a wide application prospect in the field of engineering vibration isolation.

The invention discloses a box type liquid damper comprising a box body, an upper damping plate and a lower damping plate. The box body is provided with a top plate, side plates and a base plate. The upper damping plate and the lower damping plate are provided with multiple through holes. The upper damping plate is connected to the lower surface of the top plate through springs. The lower damping plate is connected to the upper surface of the base plate through springs. The inner portion of the box body is divided by the upper damping plate and the lower damping plate into an upper liquid chamber, a middle liquid chamber and a lower liquid chamber. The box body is filled with damping liquid. The liquid level of the damping liquid is higher than a top dead center of the travel of the upper damping plate. Compared with a liquid damper in the prior art, the box type liquid damper expands the work frequency range of the liquid damper and can dynamically change the damping of the structure,and the liquid damper can efficiently consume energy and attenuate vibration.

The present invention discloses a power amplifier driving circuit which includes two parallel-connected identical double end input-single end output power amplifier driving circuit paDrvI and paDrvII, and the input signal is across connected to form a power amplifier driving circuit with the double end input-single end output structure. The invention has the advantages of wide scope of working frequency, providing enough output power, good linearity, matching the output to 50ohm and easy integrating on the chip.

The invention discloses a high-efficiency wide-limit programmable inverter power supply device and a control method thereof. The device comprises a main loop unit; the input terminal of the main loop unit is connected with commercial power; and the commercial power flows through a filter, a rectifier, and an inverter successively and then the power is transformed into a direct-current signal so as to provide power for a load. The rectifier and the inverter are connected with a programmable control unit. The programmable control unit is configured to preset a voltage effective value, carry out difference processing on the voltage effective value and an effective value fed back by voltage sampling to obtain a voltage error, carry out PI adjustment on the voltage error to generate a voltage amplitude signal with PI adjustment, multiply the voltage amplitude signal with PI adjustment by a sinusoidal wave signal generated by output voltage phase locking of the filter to obtain a sinusoidal modulation voltage signal, subtracting a received voltage instantaneous feedback signal from the sinusoidal modulation voltage signal, carry out PI adjustment, multiplying the adjusted signal with a preset proportionality coefficient to obtain an SPWM voltage pulse width signal. The SPWM voltage pulse width signal is used for driving a switching tube in the rectifier to generate a voltage waveform with a preset amplitude and frequency.

The invention relates to the technical field of refrigeration, in particular to a thermo-acoustic and electro-caloric coupling refrigeration system driven by thermal energy. The system comprises a thermo-acoustic engine, a pyroelectric engine and an electro-caloric refrigerating machine, wherein a first thermal buffer pipeline is arranged between the thermo-acoustic engine and the pyroelectric engine; a second thermal buffer pipeline is arranged between the pyroelectric engine and the electro-caloric refrigerating machine; and in addition, the electro-caloric refrigerating machine and the pyroelectric engine are connected through a conductor to form a loop. By use of the thermo-acoustic and electro-caloric coupling refrigeration system, the problems in a traditional gas compression refrigeration technology that movement parts and systems are large and complex and refrigerating fluids are harmful to an environment can be solved, the thermo-acoustic engine is combined with the pyroelectric engine and the electro-caloric refrigerating machine, the characteristics that the thermo-acoustic engine has a wide working frequency rang, is completely free from no movement components and can drive a working medium to carry out reciprocating motion can be used for replacing a traditional mechanical pump, the system is free from motion abrasion, is noiseless and is safe and reliable, meanwhile, the stability of the system is improved, and the system is compact.

The invention provides a terahertz gas detection system and a terahertz gas detection method based on photoacoustic resonance detection. The terahertz gas detection system comprises a White gas cell,a terahertz device, a microneedle quartz tuning fork system, a signal processing system and a control system. According to the terahertz gas detection system, a terahertz absorption substance is usedas a photoacoustic conversion device to generate a photoacoustic effect and surface micro-displacement, and then the micro-needle cantilever beam tuning fork and a lock-in amplifier are used for realizing photoacoustic signal intensity detection, so that the measurement of broadband terahertz wave transmission intensity is realized, and the precision and sensitivity of gas concentration detectionare improved.

The invention provides a novel radio frequency microwave energy acquisition device based on an electron spin property, which comprises at least one radio frequency microwave energy conversion part. The radio frequency microwave energy conversion part comprises a first magnetic layer, a non-magnetic space layer and an energy conversion layer, wherein the first magnetic layer is connected with a radio frequency microwave signal receiving part; and the energy conversion layer accumulates positive and negative charges at the upper and lower ends of the radio frequency microwave energy conversion part to convert the radio frequency wave energy into DC signals. Compared with the prior art, the novel radio frequency microwave energy acquisition device based on the electron spin property has the advantages that the structure is simple, the size is small, the working frequency is wide and the like.

The invention relates to a miniature piezoelectric ceramic driving control system, which belongs to the field of micro-displacement control technology. The system comprises a power supply circuit module, a master controller, and a DA conversion and high-voltage amplification circuit. A 12V power supply and a system triggering signal are respectively connected to the power supply circuit module and the master controller. The power supply circuit converts 12V power supply into 5V, 3.3V, 100V and -12V voltages, 3.3V voltage is supplied to the master controller and the DA conversion module, -12V voltage and 100V voltages are supplied to the high-voltage amplification circuit. The master controller forms a corresponding digital signal according to the waveform of the system triggering signal, converts the digital signal into an analog small-voltage signal through the DA conversion module, and finally converts into the high voltage through the high-voltage amplification circuit to be the driving voltage of the piezoelectric ceramic. The miniature piezoelectric ceramic driving control system is 10.7 cm in length and 7.6cm in width and suitable for the miniature design requirement; and the system can be widely used in the miniature control system with the piezoelectric ceramic as core.

The invention relates to a broadband high-balance on-chip transformer Balun, and belongs to the field of radio frequency devices. The broadband high-balance on-chip transformer Balun comprises two primary coils and a secondary coil. The two primary coils are formed in the manner that inductors with center taps are broken near the center taps, and the secondary coil is a plane spiral inductor with a center tap. The primary coils and the secondary coil are embedded to improve the coupling coefficient. The center taps of the primary coils and the center tap of the secondary coil are connected together and finally connected to the ground plane. According to the scheme design, the transformer Balun can solve the problems that when an existing transformer Balun works at the low frequency, the working band is narrow, the phase balance degree is poor, and insertion losses and return losses are large. The broadband high-balance on-chip transformer Balun can be used on an occasion where single end-difference conversion needs to be finished in the design of an on-chip integrated circuit.

Provided is an acoustic waveguide. An internal acoustic waveguide tube of the acoustic waveguide includes a binary-tree or ternary-tree multilevel bifurcate waveguide tube. The waveguide tube of each bifurcate structure includes a straight tube and a corner guide tube. The cross section of the acoustic waveguide tube is rectangular, circular, oval or polygonal. The cross-section area of the waveguide tube of each bifurcate structure must be small enough, and the largest-dimension size of the cross section is generally not more than 2cm. The straight tube of the waveguide tube of each bifurcate structure must be long enough, and is generally not shorter than 3cm. For an acoustic waveguide with a wide outlet, the waveguide tube of each bifurcate structure is of a layered structure at the outlet, the number of layers depends on the width of the outlet and the shape of the cross section of the waveguide tube, and the width of each layer is controlled within 2cm.

The invention provides a compressor, a control method of the compressor and an air conditioning unit. The compressor comprises a cylinder module and a motor module. The cylinder module comprises a first cylinder and a second cylinder arranged in parallel or in series; and the first cylinder is provided with a normal working state and an unloading working state. The motor module comprises a motor piece, and a winding control piece electrically connected with the motor piece; the motor piece is connected with the cylinder module, and is used for driving the cylinder module to operate; and the winding control piece is used for controlling the electrification winding number of each phase of windings of the motor piece. Through the technical scheme, the compressor can achieve a wider frequency operation range, meanwhile, can achieve the better energy efficiency in all frequency bands under the precondition of minimizing the refrigeration output quantity, is quick and stable in switching, saves the electricity, improves the comfort, and prevents the cold waste.

Disclosed are an island control method and system suitable for a solar energy storage power generation system; according to the method, firstly, the inversion output power and the load power of an inverter are obtained; then, according to preset logic, the inversion output power and the load power, the inversion output power is adjusted so as to enable the load end voltage to be abnormal along with the adjustment of the inversion output power when the island occurs; and finally, when it is detected that the load end voltage is abnormal, a commercial power relay is disconnected, and the cuttingoff of the commercial power and the solar power generation system is realized. According to an energy positive feedback mode, when the commercial power is lost, the load end voltage is in fast avalanche, and the abnormal protection of the power grid is triggered to disconnect the connection between the load end and the power grid, so that the influence of wide working commercial power frequency range and the large commercial power voltage fluctuation of the solar energy storage power generation system can be avoided, and the island control of the solar energy storage power generation system is realized.

The invention relates to the technical field of vibration noise control, in particular to a torsion vibration absorber with piecewise linear rods. According to the technical scheme, the torsion vibration absorber comprises a supporting disc, a bearing, a shaft sleeve, a fastening screw, a connection rod, the piecewise linear rods and a vibration absorbing mass block. The supporting disc is of a disc structure, the supporting disc is fixedly connected to a rotor, the vibration absorbing mass block is of a disc structure, the vibration absorbing mass block is provided with a center hole and fourcircular arc grooves distributed evenly in the circumference with different slot widths and different circular arc angles, the supporting disc is fixedly connected with the vibration absorbing mass block through the connection rod, the piecewise linear rods are four rigid rods with different diameters, one end of each piecewise linear rod is fixedly connected with the supporting disc, and the other ends of the piecewise linear rods are placed into the four circular arc grooves correspondingly and keep gaps away from the angular displacement direction of the circular arc grooves. The torsion vibration absorber with the piecewise linear rods is simple in structure, wide in vibration suppression frequency band and remarkable in effect.

Disclosed herein are a delay-locked loop circuit using a phase inversion locking algorithm and a method of controlling the same. There is provided a delay-locked loop circuit using a phase inversion locking algorithm, including a phase inversion controller configured to control whether or not to use the phase inversion locking algorithm by determining a phase error between an input clock signal and an output clock signal, an inverter configured to invert the input clock signal and output the inverted input clock signal, a multiplexer configured to receive the input clock signal and the inverted input clock signal of the inverter and output the input clock signal in response to the control signal of the phase inversion controller or the inverted input clock signal, and a delay-locked loop connected to the output terminal of the multiplexer and configured to perform phase synchronization in response to the output signal of the multiplexer.