60results about How to "Adjust working frequency" patented technology

The invention relates to a drive and temperature control circuit of a quantum cascade laser, which belongs to the technical field of electrons. The drive and temperature control circuit is used for supplying accurate and adjustable pulse width modulation (PWM) drive voltage to the quantum cascade laser and for precisely controlling the working environment temperature of the quantum cascade laser. The drive and temperature control circuit comprises a single chip microprocessor, an adjustable voltage stabilizing source, a temperature control module, a PWM control module and a load protection module. The drive and temperature control circuit is simple in design and convenient to use; the work status of the laser load can be comprehensively monitored, an over-current protection function is realized, high-voltage breakdown is prevented, the pulse width adjustability is good, the pulse width can be minimized to ns grade, adjustable pulse width and adjustable working frequency can be realized, stable working temperature is achieved, and laser generated by the quantum cascade laser which is sensitive to the ambient temperature can be maintained at constant optical wavelength.

The invention discloses an adjusting method and structure for resonance frequency of a demounting type spray head of an atomizer. When electrical connection of assembling or replacing the demounting type spray head of the atomizer on or from a host machine is finished, a microcomputer in the host machine gradually sends out a preset frequency and more than one detection frequency and drives a piezoelectric element on the spray head to work in a detection manner by the signal multiplication of a power amplification unit; a resistor is arranged on an electrical connection line passing through the gap between the power magnification unit and the piezoelectric element, a feedback signal generating unit is used for detecting the change of electric signals at two ends of the resistor, a starting value feedback signal and more than one adjusting valve feedback signal are gradually generated according to the sending of the preset frequency and the detection frequency of the microcomputer, and the feedback signals are output to the microcomputer for comparing or processing; and therefore, the demounting type spray head can be assembled to or replaced from the host machine, the resonance frequency of the piezoelectric element can be simply and automatically adjusted, inconvenience or error caused by manual frequency adjusting and correcting is avoided, and optimal atomization effect is exerted.

A technique is provided for use in a handheld multimedia device that uses the historical load profile statistics of a particular multimedia stream to dynamically scale the computational power of a computing engine, depending upon the complexity of the multimedia content and thereby reduce the power consumption for computationally less intensive content and consequently reduce the power consumption by a significant amount over a duration of time.

The invention discloses a device and method for rapidly forming a metal part through induction heating. The device comprises a base plate, a front heating unit and an induction smelting unit. The base plate is located below the induction smelting unit and used as a platform for metal part forming. The front heating unit is located between the base plate and the induction smelting unit and used for forming a uniform temperature field. The induction smelting unit comprises a support and a smelting crucible arranged on the support. An induction coil is arranged on the smelting crucible. The outlet end of the smelting crucible is provided with a smelting crucible nozzle opposite to the base plate. The inlet end of the smelting crucible is connected with an air inlet through a rubber plug and used for providing inert gas for the smelting crucible. The method is used for achieving induction heating and rapid forming of the metal part through the device. The device and method have the advantages of being high in machining flexibility, small in subsequent machining amount and the like.

The invention discloses a frequency-adjustable charge pump unit, a chip and a communication terminal. The charge pump unit includes a frequency variable signal generator, a charge pump circuit and a voltage detector which are connected with one another sequentially; the frequency variable signal generator outputs clock signals for the charge pump circuit; the charge pump circuit generates output voltage according to the clock signals; the output voltage, on the one hand, drives a load, and on the other hand is connected with the voltage detector; and the output end of the voltage detector is connected with the frequency variable signal generator. With the frequency-adjustable charge pump unit of the invention, the working frequency of the frequency variable signal generator can be dynamically adjusted according to the requirement of the working state of a radio frequency system for the driving output of the charge pump unit, and therefore, practical demands for on-demand load driving and noise interference reduction of the radio frequency system can be satisfied simultaneously.

The present invention discloses a multiple resonance tube thermo acoustic engine which disposes two or more resonance tubes on a thermo acoustic engine. The thermo acoustic engine is a travelling wave thermo acoustic engine, a standing wave thermo acoustic engine or a travelling wave and standing wave mixing type thermo acoustic engine. The resonance tube is an equal diameter tube, a variable diameter tube or the combination to them. The present invention optimizes the sound field distribution of a thermo acoustic engine, reduces the glutinosity flow lost for a thermo acoustic heat regenerator, restrains the nonlinear effect in the tube, improves the adaptive ability for the engine, and achieves the object of improving heat conversion efficiency. In addition, the present invention can conveniently adjust the work frequency of the thermo acoustic engine and optimize the frequency matching between the thermo acoustic engine and other driven load such as pulse tube refrigerator by coupling different resonance tube structures.

The invention provides a terahertz source amplifying device based on a multiple-cascade high-frequency structure. The terahertz source amplifying device is a cascaded multi-electron-beam terahertz radiation source combining a backward wave amplifier and a traveling wave amplifier. A THz excitation signal is input to the backward wave amplifier and is amplified through backward wave electron beam-wave interaction, a backward wave signal is output to a traveling wave high-frequency structure through dual ports, multistage amplification and band broadening are realized through multiple beam-wave interaction at a traveling wave section, and power synthesis is carried out on signals output by the multiple-cascade structure. The terahertz source amplifying device based on multiple-cascade high-frequency structure has the characteristics of high power, high gain and wide band, has absolute advantages in implementing a THz integrated vacuum electronic device and has important application prospects in aspects such as THz radar, communication, danger detection and imaging.

A method for adjusting the operating frequency of a chip. The method first detects the frequency adjustment range of the display chip when the system is turned on. Then, execute the full-screen application and enable the control hotkey. Then, receiving the input of controlling the hotkey to display the user interface. Finally, the input frequency input by the user interface is received, and the operating frequency of the display chip is adjusted within the frequency adjustment range according to the received input frequency. In this way, even when an application program with a full-screen image is being executed, the operating frequency of the display chip can be adjusted at any time as required, which is very convenient.

The invention discloses a metamaterial and a frequency adjustment method and apparatus therefor. The metamaterial comprises a substrate material, an electric controllable structural unit array and a variable capacitance diode, wherein the electric controllable structural unit array is arranged on the substrate material; the electric controllable structural unit array comprises multiple electric controllable structural units, wherein each electric controllable structural unit comprises an external metal structure and an internal metal structure; the internal metal structure and the external metal structure form an annular channel; and the variable capacitance diode is arranged in the channel of each electric controllable structural unit, and used for adjusting the working frequency of each electric controllable structural unit according to the voltages loaded at the two ends of the variable capacitance diode. By virtue of the metamaterial, the technical problem that the working frequency of the metamaterial cannot be adjusted quickly and accurately in the prior art can be solved.

The invention discloses a prestressed tensioning system. The prestressed tensioning system comprises a master controller as well as a first slave controller and a second slave controller which are respectively and wirelessly connected with the master controller through wireless data transmitting modules; both the first slave controller and the second slave controller are connected with jacks through frequency converters, variable frequency motors and hydraulic pumps in sequence; the two jacks are separately connected with pressure sensors for acquiring pressure of oil inlets and displacement sensors for acquiring the displacement of pistons; the pressure sensors and the displacement sensors are used for transmitting acquired signals to the corresponding slave controllers; the acquired signals are transmitted to the master controller through the slave controllers; the mater controller and a remote monitoring center perform data transmission through a GPRS (General Packet Radio Service) wireless network module; the remote monitoring center is provided with a central server and a terminal; the terminal is connected with the central server through an Internet network. According to the prestressed tensioning system disclosed by the invention, the master controller is used for comparing acquired data of the two jacks and transmitting instructions to the variable frequency motors for enabling the two jacks to synchronous tensioning, so high degree of automation is realized.

A decoupling structure among multi-input-multi-output antennas comprises a dielectric substrate and a patch, wherein the patch is arranged on the dielectric substrate and comprises an enclosed rectangular ring, a swastika-shaped structure and / or inverse swastika-shaped structure and a U-shaped strip line structure, wherein the enclosed rectangular ring is arranged on the dielectric substrate, theswastika-shaped structure and / or inverse swastika-shaped structure is embedded into the rectangular ring, the rectangular ring is connected with one end of the U-shaped strip line structure, and the swastika-shaped structure and / or inverse swastika-shaped structure is embedded into a gap of the U-shaped strip line structure. With the adoption of a mode that an inner structure and an outer structure are embedded, resonant property with high impedance characteristic is formed, the decoupling structure is simple and integrates with the multi-input-multi-output antennas, and the whole profile of the decoupling structure is relatively low; the structure is reasonable in layout, the space resource is reasonably utilized, integrated design of a wireless communication system terminal is easy to achieve, and installation and debugging are facilitated; and the structure has relatively small size and is easy to integrate with mobile terminal equipment, the resonant frequency can be conveniently adjusted very well, and the effect of preventing required interference is achieved.

This invention relates to one single layer medium board structure waveguide and micro band transducer signals aligning machine, wherein, the medium board side to wave guide tube is set with metal earth connection board and frequency adjust and match unit; the metal connection board middle is set with one window with same sizes to inner chamber section; the said window central position is set with frequency adjust and match unit; the medium board other side is set with short metal board; there are two open tanks on both side of short metal board.

The invention discloses a frequency-adjustable directed-radiation antenna which comprises a substrate with multiple through holes, a magnetic photonic crystal and a line source. The magnetic photonic crystal is composed of multiple soft magnetic ferrite columns and is of a periodic array structure, each soft magnetic ferrite column is disposed in the corresponding through hole, a bias magnetic field is externally added along the axial direction of the soft magnetic ferrite columns, the line source is positioned in the middle of the photonic crystal, a metal cover plate is arranged on each of the upper surface and the lower surface of the substrate, an aluminum foil covers one side, opposite to the radiation direction, of the photonic crystal, and two ends of the soft magnetic ferrite columns are close to the metal cover plates. The frequency-adjustable directed-radiation antenna has the characteristics of wide frequency band, good directed radiation performance and the like and has the advantages of simple structure, easiness in processing and realizing, low cost and the like.

The invention relates to a frequency-adjustable sound wave receiving device based on a Helmholtz resonant cavity. The device comprises the Helmholtz resonant cavity and an acoustic sensor, wherein theHelmholtz resonant cavity comprises a cavity body and a through hole communicating with the cavity body, the Helmholtz resonant cavity is arranged on the acoustic sensor, and the cavity body is in contact connection with the surface of the acoustic sensor. According to the device, the MEMS acoustic sensor and the Helmholtz resonance cavity are combined, the sensitivity is high, and the electroacoustic energy conversion efficiency of an ultrasonic transducer can be improved.

The invention discloses a device for adjusting working frequency of a step down converting circuit through detecting temperature, which comprises a temperature control module, a variable module and a controller. The temperature control module is used for detecting the temperature of a central processor, judging the current output load state of the step down converting circuit according to the acquired current temperature of the central processor, and outputting control signals according to the load state. The variable module is coupled to the step down converting circuit for providing an external resistor for the step down converting circuit. The controller is coupled to the temperature control module and the variable module respectively for receiving the control signals and adjusting the resistance value of the variable module according to the control signals in order to adjust the working frequency of the step down converting circuit. The device can reduce the loss of the step down converting circuit.

The embodiment of the invention relates to a frequency control method and device, a radio frequency system and communication equipment, and the method comprises the steps: obtaining the transmitting power of a power amplifier when the power amplifier is in a working state, and determining a power level corresponding to the transmitting power; and controlling a voltage converter to be switched to aworking frequency corresponding to the power level, wherein the voltage converter is used for supplying power to the power amplifier at the working frequency. Through the steps, the working frequencyof the voltage converter can be effectively adjusted according to the running state of the communication system and the responded transmitting power, so the cross-modulation interference phenomenon in the communication system and the voltage converter is inhibited, the communication quality of the communication system is improved, and the communication experience of a user is improved.

The invention provides a mobile terminal working parameter control method and device and a mobile terminal. The mobile terminal working parameter control method is applied to a server and comprises the steps that date information and geographical location information uploaded by the mobile terminal are acquired; a working parameter control strategy corresponding to the date information and the geographical location information of the mobile terminal is determined, wherein the working parameter control strategy is performed by the mobile terminal and then used for controlling the working frequency of the mobile terminal; and the working parameter control strategy is transmitted to the mobile terminal. According to the method, the geographical location information and the date information ofthe mobile terminal are considered and the working parameter control strategy transmitted to the mobile terminal is enabled to further meet the use environment of the mobile terminal, and the workingfrequency of the mobile terminal can be adjusted by operating the working parameter control strategy so that the mobile terminal is enabled to be maintained at the reasonable working frequency and the heat radiation and the power consumption are ensured to be unified with the use environment.

The invention provides a graphene-based optical carrier microwave antenna, which is composed of a metal grounding plate, an insulating dielectric layer, a metal structure layer, a graphene film patchand an optical waveguide. The metal structure layer comprises a microstrip connecting line, an impedance matching transmission line and a radiation patch. According to the antenna, when signal light irradiates the graphene patch, the conductivity of graphene is changed along with the intensity of the signal light, so that an optical signal is converted into a microwave radiation signal. Accordingto the antenna, the optical adjustability of the graphene is utilized, the high electron mobility of the graphene and the resonance property of the metal antenna structure are combined, optical signals can be directly converted into microwave signals without photoelectric signal conversion, the hardware structure is simple, the speed is high, the size is small, and the antenna can be applied to high-speed wireless communication.

The invention discloses a duplexer, network equipment, a control method, electronic equipment and a storage medium, and belongs to the technical field of communication. The duplexer includes: a filter; a dielectric tuning component; and a control module which is connected with the dielectric tuning component and is used for controlling the relative position of the dielectric tuning component and the filter so as to adjust the working frequency of the duplexer. According to the duplexer, the relative position of the dielectric tuning component and the filter is controlled, and the reactance parameter of the equivalent circuit of the filter is changed, so that the attribute parameter of the filter is changed, and the purpose of adjusting the working frequency of the duplexer is achieved. When a diplexer with various frequencies is needed, the flexibility and the application range of the diplexer can be improved by adjusting the relative position of the dielectric tuning component and the filter and adjusting the working frequency of the diplexer, so that the problem that a certain amount of diplexer spare part inventory needs to be prepared for different sub-bands is avoided, and the inventory pressure of manufacturers is reduced.

The invention relates to an air conditioning compressor (1) for a vehicle (24), in particular a motor vehicle (25), having a compression chamber (18) having an inlet (7) for a cooling medium to be compressed and an outlet (8) for the compressed cooling medium, wherein a wall of the compression chamber (18) is formed at least in sections by a translationally displaceable piston (3). According to the invention, the end of the piston (3) facing away from the compression chamber forms at least one wall region of a control pressure chamber (19). The invention further relates to a vehicle having an air conditioning apparatus.

The invention provides a multifunctional integrated oxygen sensor, which comprises a straight through pipe, two ultrasonic probes and a control module, wherein the ultrasonic probes are arranged on the straight through pipe, and are electrically connected with the control module, the control module comprises a main control circuit, a pressure acquisition module, a temperature and humidity detection module, a micro-pressure detection module and a wireless Bluetooth data transmission module, the main control circuit is electrically connected with the pressure acquisition module, the temperature and humidity detection module, the micro-pressure detection module and the wireless Bluetooth data transmission module, and the main control circuit, the pressure acquisition module, the temperature and humidity detection module, the micro-pressure detection module and the wireless Bluetooth data transmission module are integrated on the same circuit board. The multifunctional integrated oxygen sensor has the functions of detecting the oxygen concentration, the oxygen concentration and the temperature of the oxygen generator, detecting the pressure, the temperature and the humidity of the oxygen storage tank, detecting the pressure of an air outlet and the like at the same time, multiple functions are integrated through the multifunctional integrated oxygen sensor, and the manufacturing cost is reduced.

The invention discloses a small ultra-wideband different-plane mirror image dipole array antenna, which comprises a top-layer stepped comb-shaped structure printed line, a top-layer triangular printedline, a middle microwave dielectric material layer, a bottom-layer stepped comb-shaped structure printed line and a bottom-layer triangular printed line at the end part of the bottom-layer stepped comb-shaped structure printed line, wherein the top-layer triangular printed line, the middle microwave dielectric material layer and the bottom-layer stepped comb-shaped structure printed line at the end part of the top-layer stepped comb-shaped structure printed line; the top-layer stepped comb-shaped structure printed line and the bottom-layer stepped comb-shaped structure printed line are in different-surface mirror symmetry in structure to form different-surface dipoles of the array antenna; by linearly increasing or decreasing the number of dipole pairs with different arm lengths on the basis of the different-plane dipoles, the working bandwidth of the whole antenna can be adjusted, and the consistency of a radiation pattern can be kept; and the radiation pattern of the array antenna is parallel to the axial direction of the antenna. The antenna adopts a common PCB dielectric material, can be processed and manufactured more conveniently, and has the advantages of small size, adjustable frequency, good directional diagram consistency in the whole working frequency band, axial radiation direction and the like, thereby showing that the antenna has a wider application prospect.

The invention discloses a biomass particle temperature-increasing and freeze-proofing system for a heliogreenhouse. The system comprises a fuel feeding machine, a combustion machine and a heat exchange device, and the fuel feeding machine, the combustion machine and the heat exchange device are integrally formed. According to the system, feeding, air blowing and air inducing equipment can be adjusted, and heat can be sufficiently collected and diffused under the condition of low energy consumption; hot air collection and circulation with small-load combustion, large-area heat exchange, multi-point-location collection and full-coverage circulation is achieved so that heat dissipated by combustion, exchange and circulation devices can all be collected into a circulating system and quickly diffused to all directions of the heliogreenhouse; the utilization rate of the heat is effectively increased, the loss amount of the heat is reduced, a new way for standardized and routinized application of biomass particle fuel in temperature-increasing and freeze-proofing procedures of the heliogreenhouse is put forward, organic combination of ecology, environmental protection and circulation of modern facility agriculture is achieved, and the advancement level takes the lead in China.

The invention discloses a hydraulic control system of a crusher. The hydraulic control system comprises two hydraulic cylinders, magnetic exchange valves, ball valves, two-way speed control valves, a proportional pressure and flow combined control valve, pressure relays, an air cooler, travel switches, pressure sensors and displacement sensors. Piston rods of the hydraulic cylinders are controlled by all the magnetic valves and all the speed control valves to operate at a set speed, and materials are crushed. By means of the hydraulic control system of the crusher, it can be guaranteed that impact rammers can not intervene, the operating frequency can be adjusted, and reciprocating impact crushing work can be automatically completed through the system. The pressure of the system can be automatically increased under the hard material condition, the materials are extruded and crushed, and crushing efficiency is improved. Normal work of the system is guaranteed to the maximum degree through the limited control valves, the components are in the intermittent work state, and work reliability is improved; when parts of the components fail, replacement can be carried out without halting, and the working efficiency of the crusher is improved.

The invention discloses an adjusting method and structure for resonance frequency of a demounting type spray head of an atomizer. When electrical connection of assembling or replacing the demounting type spray head of the atomizer on or from a host machine is finished, a microcomputer in the host machine gradually sends out a preset frequency and more than one detection frequency and drives a piezoelectric element on the spray head to work in a detection manner by the signal multiplication of a power amplification unit; a resistor is arranged on an electrical connection line passing through the gap between the power magnification unit and the piezoelectric element, a feedback signal generating unit is used for detecting the change of electric signals at two ends of the resistor, a starting value feedback signal and more than one adjusting valve feedback signal are gradually generated according to the sending of the preset frequency and the detection frequency of the microcomputer, and the feedback signals are output to the microcomputer for comparing or processing; and therefore, the demounting type spray head can be assembled to or replaced from the host machine, the resonance frequency of the piezoelectric element can be simply and automatically adjusted, inconvenience or error caused by manual frequency adjusting and correcting is avoided, and optimal atomization effect is exerted.

The invention relates to a spray driving device and a spray system. The spray driving device is used for driving the piezoelectric material of a spray module; the spray driving device includes a driving circuit, a control circuit and a feedback circuit; when the control circuit controls the driving circuit to drive the piezoelectric material with a driving frequency, the feedback circuit detects electrical data fed back by the piezoelectric material and transmits the electrical data to the control circuit; and the control circuit controls the driving circuit to drive the piezoelectric material with a working frequency according to the electrical data. With the spray driving device of the invention adopted, the working frequency of a sprayer can be automatically adjusted and tracked, so that the spray effect of the sprayer can be optimized; when the piezoelectric material of the sprayer is damaged, it only needs to replace an old spray module with a new spray module, and it does not need to abandon the whole sprayer; and as for the new spray module, the sprayer will automatically adjust the working frequency, so that the spray effect of the sprayer can be optimized.

The invention discloses a switching power supply control circuit, which is applied to a current-controlled switching power supply, and is characterized in that it includes a trigger circuit and a current source control circuit, and the trigger circuit samples the state signal of the working state pin of the switching power supply control chip through its input terminal , with reference voltage V REF comparison, when the status signal does not reach the reference voltage V REF , its output terminal provides current for the input terminal of the current source control circuit, and the current source control circuit works under the action of the current source to increase the current value of the current control pin of the switching power supply control chip; when the state signal reaches the reference voltage V REF When , the output terminal of the trigger circuit does not provide a current source for the input terminal of the current source control circuit, and the current source control circuit does not work. The invention not only realizes the purpose of adjusting and controlling the output frequency when the switching power supply is in the start-up stage, but also solves the problems of large ripple noise and poor dynamic characteristics of the switching power supply at no-load or light load.