18results about How to "Adjustable frequency" patented technology

The utility model provides an adjustable pulse generator. The adjustable pulse generator comprises an input unit, a control unit and a driving circuit, the input unit is used for receiving a PWM signal parameter value input by a user; the control unit is used for outputting a PWM signal with a preset frequency and a preset duty ratio based on a PWM signal parameter value input by a user; and the driving circuit is used for modulating the PWM signal output by the control unit so as to drive the power semiconductor device to be tested. According to the adjustable pulse generator provided by the invention, parameters such as the frequency and the duty ratio of the pulse signal are adjustable, the circuit structure is simple, the cost is relatively low, and the size of a test tool is reduced.

The invention provides a concentration analyzer automatic cleaning system for an explosion-proof area and a control method.The concentration analyzer automatic cleaning system comprises a brush cleaning unit, a high-pressure water cleaning unit, an ultrasonic cleaning unit, a cleaning pollution judging unit and a data interaction interface, and a brush assembly arranged in the brush cleaning unit is installed on one side of an optical window of a refractometer; a brush assembly is arranged in the window to ensure that the brush covers the surface of the window, a driving unit of the brush assembly performs data interaction with the data interaction interface, a plurality of parameters are built in the driving unit, the driving unit controls the movement speed and driving pressure of the brush in the brush assembly, and adjustment is performed by receiving a control instruction of the data interaction interface; a high-pressure pump, nozzles and a connecting pipeline are arranged in the high-pressure water cleaning unit, the nozzles are arranged around an optical window of the refractometer and connected with the high-pressure pump through the connecting pipeline, a control unit is arranged on the high-pressure pump, and water pump pressure parameters and time interval parameters are preset in the control unit.

A static balancing instrument comprises a fixed support, a swing frame is installed on the fixed support through a plurality of oscillator assemblies I, an unstable platform is installed on the swing frame through a plurality of oscillator assemblies II, an ankle joint assembly is further installed on the unstable platform, and the ankle joint assembly comprises an ankle joint support and an ankle joint pedal. The ankle joint support is installed on the unstable platform, the ankle joint pedal is hinged to the ankle joint support, a plurality of ankle joint angle scales are further installed at the bottom of the ankle joint pedal, the ankle joint angle scales are installed on the ankle joint pedal through screws, and a plurality of ankle joint angle supporting columns with different lengths are further installed at the bottoms of the ankle joint angle scales; the fixed support is further provided with a guardrail assembly, and the swing frame is further provided with a plurality of resistance adjusting rods matched with the fixed support. The device is reasonable in design, safe to use, adjustable in shaking frequency and amplitude, capable of meeting the requirements of different persons conveniently and suitable for various scenes such as balance training and rehabilitation training.

The invention relates to a special-shaped cavity inner wall evaporation magnetron sputtering target material system, and relates to the field of target materials. The device comprises an aluminum alloy bracket, a sputtering system vacuum cavity arranged on the aluminum alloy bracket, a displacement transmission device arranged above the sputtering system vacuum cavity, and a special-shaped cavity magnetron sputtering ellipsoidal target system arranged in the sputtering system vacuum cavity and connected with the displacement transmission device, the external vacuum pump set and the vacuum measuring equipment are arranged at the bottom of a vacuum cavity of the sputtering system, an ellipsoidal single-cell superconducting radio frequency cavity is formed in the vacuum cavity of the sputtering system, and the irregular cavity magnetron sputtering ellipsoidal target system comprises an ellipsoidal niobium target material arranged in the single-cell superconducting radio frequency cavity. And a copper rod is connected between the displacement transmission device and the single-cell superconducting radio frequency cavity. According to the invention, uniform coating can be realized by moving the target material in the radio frequency acceleration cavity and controlling the power of the target material and the sputtering time at the same time; the target material is small in size and can be uniformly placed in an external magnetic field coil.

The utility model discloses a frequency reconfigurable liquid crystal phase shift antenna unit suitable for a phased array system. The frequency reconfigurable liquid crystal phase shift antenna unit comprises a first-layer dielectric substrate; the second-layer dielectric substrate and the first-layer dielectric substrate are oppositely arranged in parallel in the vertical direction; the third-layer dielectric substrate and the second-layer dielectric substrate are relatively arranged in parallel in the vertical direction; the first liquid crystal layer is filled between the first dielectric substrate and the second dielectric substrate; the second liquid crystal layer is filled between the second dielectric substrate and the third dielectric substrate; the first supporting structure is vertically arranged between the first dielectric substrate and the second dielectric substrate; the second supporting structure is vertically arranged between the second dielectric substrate and the third dielectric substrate; the first grounding electrode layer is printed on the upper surface of the first dielectric substrate layer; the strip line phase shifter is printed on the lower surface of the second dielectric substrate; the second grounding electrode layer is printed on the upper surface of the second dielectric substrate; and the radiation patch is printed on the lower surface of the third-layer dielectric substrate. According to the utility model, the wide-angle phase shift and frequency reconfigurable characteristics can be realized, and the antenna is suitable for a phased array system.

The utility model discloses a broadcast double-flash warning lamp with adjustable frequency. The broadcast double-flash warning lamp comprises an oscillating circuit and a lamp group circuit, wherein the lamp group circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first triode, a second triode, a third triode, a fourth triode, a first lamp and a second lamp; the first triode, the third triode and the fourth triode are PNP type diodes, and the second triode is an NPN type diode; the input end of the oscillating circuit is used for being connected with a first power supply, and the output end of the oscillating circuit is connected with the second end of the fourth resistor. According to the invention, the double-flash warning lamp with adjustable frequency can be realized at relatively low hardware cost, and the practicability is better. The warning lamp can be widely applied to the technical field of warning lamps.

The utility model belongs to the technical field of rail transit signals, and particularly relates to signal generating equipment for ballast bed resistance testing. The signal generating device at least comprises a working unit. The working unit at least comprises a signal generation module, a power amplification module, a monitoring module and a precision resistance box. The output end of the signal generation module is connected with the input end of the power amplification module. The output end of the power amplification module is connected with the input end of the monitoring module. The monitoring module is provided with two output ends. And the precision resistance box is connected in series with one output end of the monitoring module. The precision resistance box at least comprises a rotary switch and a plurality of sampling resistors connected in series. And a plurality of sampling resistors surround the rotary switch. The frequency of output signals of the signal generating equipment for ballast bed resistance testing covers signal frequency points of all track circuits, sampling resistance values can be adjusted with a 100m omega stepping value, the maximum output power is 20W, the maximum output current is 1A, the peak-to-peak value is not smaller than 28V during no-load, and the signal generating equipment has an output short-circuit protection function.

The invention discloses a high-voltage pulse power supply system through frequency conversion voltage regulation and a design method, and belongs to the technical field of pulse power supplies, the high-voltage pulse power supply system comprises a boosting module and a pulse generation module, in the boosting module, a single-chip microcomputer generates an alternating square wave signal with a certain frequency and inputs the alternating square wave signal into a driving circuit, and a switch of an MOS tube is indirectly controlled through an optocoupler and a device in the single-chip microcomputer; two paths of 12V square wave voltages are generated and applied to the LCC boost circuit, the input 12V high-frequency low-voltage electricity is converted into high-frequency high-voltage electricity, and the generated high-frequency high-voltage electricity is subjected to voltage doubling rectification through the C-W third-order six-time voltage doubling circuit and is output to the voltage division circuit; the frequency regulation and control circuit can be adjusted to change the frequency of the square wave signal generated by the single chip microcomputer so as to control the amplitude of the output voltage; and meanwhile, the voltage division circuit divides the finally generated high voltage to the main control circuit to form closed-loop regulation on the voltage. And the generated high-frequency high-voltage electricity is input into the pulse generation module to generate pulses. The device is simple in structure, adjustable in output voltage and high in transformer conversion efficiency.

The invention discloses an aqueous solution conductivity monitor, which comprises a main processor, a conductivity acquisition circuit, a display unit and a square wave excitation circuit, and is characterized in that the conductivity acquisition circuit, the display unit and the square wave excitation circuit are respectively connected with the main processor; the square wave excitation circuit comprises a power conversion circuit, a square wave control circuit, a square wave amplitude switching circuit and a current amplification circuit which are connected in sequence; the conductivity acquisition circuit is connected to a conductivity electrode, and the conductivity electrode is connected with the current amplification circuit. According to the aqueous solution conductivity monitor, based on the arrangement of the square wave excitation circuit, the frequency and amplitude of the square wave voltage signal of the square wave excitation circuit can be controlled through a program of the main processor, and the aqueous solution conductivity monitor has a variable frequency adjustment function, so that conductivity online monitoring can be switched back and forth in different frequency bands; according to the invention, other measured pulse signals can be effectively distinguished, and the polarization effect of the conductivity electrode can be reduced.

This invention belongs to the field of new energy vehicle charging cable technology, specifically an adjustable power millimeter wave therapy device, probe control assembly, and method. It includes: a body 1, which controls various electrical components; the body 1 serves as the main structure of the millimeter wave therapy device, providing electrical control and millimeter wave output; two ends 2 located on one side of the body 1 for millimeter wave therapy on the patient; the ends 2 contact the patient for millimeter wave therapy; and a wire 14 located between the body 1 and the ends 2 for electrical connection. The wire 14 connects and conducts the millimeter wave, ensuring that the millimeter wave generated by the body 1 can stably reach the ends 2 for patient treatment. The probe control assembly of this adjustable power millimeter wave therapy device is simple to operate, safe, stable, facilitates millimeter wave therapy on the patient, has strong adaptability, good treatment effect, and high treatment efficiency, meeting actual treatment needs.

The utility model relates to sample collection device technical field, concretely for water sample automatic continuous sampler, including rustproof shell, collection subassembly, collection subassembly includes trace peristaltic pump, trace peristaltic pump fixedly connected in the inside of rustproof shell, one side of trace peristaltic pump is fixedly connected with sampling hose, one side of sampling hose is provided with anti -blocking filter head hole. The water sample automatic continuous sampler, through installing collection subassembly, can realize that the front end of sampling hose is connected with screen filter and 50 -mesh filter head, is used to pretreat water sample, prevents impurity and blocks sampling system, and trace peristaltic pump is equipped with LED display screen, and the sampling frequency and sampling cycle can be adjusted, so as to adjust sampling mode and cycle according to actual demand, ensure accurate sampling, and the collected sample will enter the sampling bottle from the other end, adopt this kind of structure to make the whole sampling system can be safely and stably maintained in rustproof shell, and then it is convenient to sample under complex environment.

The present invention discloses a microstrip dual-frequency adjustable bandpass filter based on a folded open ring. The dual-frequency bandpass filter is formed by resonator coupling. Variable capacitance diodes are loaded at the opening of the open ring resonator and the terminal of the step impedance resonator respectively. The capacitance value is changed by changing the external voltage, thereby changing the resonant frequency of the filter, so that the dual frequency bands of the filter are independently adjustable.

The utility model provides an ultrasonic oscillation integrated device for a laboratory. The ultrasonic oscillation integrated device for the laboratory comprises an equipment frame and four base supports, the four base supports are fixedly connected to the bottom of the equipment frame, an ultrasonic module is installed at the position, close to the front face, of one side of the equipment frame, and a vibration module is installed at the position, close to the back face, of one side of the equipment frame; and a socket is installed on one side of the equipment frame through a fixed base, and a drainage pipe is installed on one side of the equipment frame. According to the ultrasonic oscillation integrated device for the laboratory, through the design, the structure is simple, operation is convenient, ultrasonic oscillation integration and frequency and amplitude adjustment can be achieved, the ultrasonic oscillation integrated device is suitable for the ultrasonic and oscillation requirements under different experiment conditions, and a sample is firm and reliable on the fixing plate through the fixing device; the sample container is prevented from falling off or shifting in the oscillation process, and the accuracy of an experimental result is ensured.

The utility model relates to a three-path output switching power supply circuit, which comprises an electromagnetic interference suppression circuit, a rectification filter circuit, a power supply control circuit, a power conversion circuit, a power supply output circuit and a feedback circuit which are electrically connected, the electromagnetic interference suppression circuit is electrically connected with the input end of the rectification filter circuit. The rectification filter circuit is electrically connected with the input end of the power conversion circuit and the input end of the power supply control circuit. The power control circuit is electrically connected with the input end of the power conversion circuit, the power conversion circuit is electrically connected with the input end of the power output circuit, the power output circuit is electrically connected with the input end of the feedback circuit, and the feedback circuit is electrically connected with the input end of the power control circuit. The device is reasonable in design, compact in structure and convenient to use.

The application discloses a frequency-adjustable non-reciprocal transmission system based on a PT symmetry principle and a detection method thereof, and the circuit system comprises a loss resonance module of inductance-capacitance-positive resistance parallel resonance, an adjustable coupling module and a gain resonance module of inductance-capacitance-negative resistance parallel connection; wherein the loss resonance module and the gain resonance module are connected through the adjustable capacitance coupling module to form a PT symmetric system; signal transmission from the loss resonance module to the gain resonance module is forward transmission, and vice versa is reverse transmission. By changing the adjustable capacitance coupling module, the coupling coefficient between the loss module and the gain module is changed, so that the transmission frequency of the system is changed. The amplitude of the transmission signal is adjusted, the saturation property of the negative resistance in the gain resonance module is utilized to realize the difference between the forward transmission coefficient and the reverse transmission coefficient, and non-reciprocal transmission is realized. The system has the advantages of high non-reciprocal ratio, low insertion loss and the like.

The invention belongs to the field of radio frequency signal generators, and particularly relates to a high-resolution radio frequency signal generation circuit, system and method. The circuit comprises a digital frequency synthesizer DDS-1, a digital frequency synthesizer DDS-2, a radio frequency selection switch MUX-1, a radio frequency selection switch MUX-2 and a radio frequency power amplifier, and the input end of the digital frequency synthesizer DDS-1 is connected with an external controller. According to the invention, through a circuit form of connecting two digital frequency synthesizers DDS in series, a radio frequency signal with adjustable frequency and adjustable amplitude can be provided to the outside; an external radio-frequency signal can be received and synchronized with the external radio-frequency signal, and the output amplitude can be adjusted by 360 degrees based on the frequency signal; a radio frequency signal for synchronization can be provided to the outside; according to the invention, a controller can input a pulse signal carrier to a radio frequency output signal, so that the radio frequency output signal is a continuous signal or a pulse signal, a scheme which can only be realized by a multiplier and an FPGA (Field Programmable Gate Array) is solved, and the hardware cost and the development difficulty are reduced.

The invention provides a signal generation device and method, and the device comprises at least two local oscillator lasers which are used for generating at least two laser signals with different frequencies; the oscillation loop is used for carrying out oscillation based on at least two laser signals with different frequencies and generating a first radio frequency signal corresponding to the laser signal with each frequency; the feedback controllers are in one-to-one correspondence with the local oscillator lasers and are used for generating feedback signals based on the first radio frequency signals corresponding to the laser signals of all frequencies and inputting the feedback signals into the corresponding local oscillator lasers so as to adjust the frequencies of the laser signals output by the local oscillator lasers; wherein after the frequencies of the at least two laser signals generated by the at least two local oscillator lasers are locked to different harmonic peaks corresponding to the optical filter in the oscillation loop, the optical filter is further used for outputting a first optical terahertz signal, and the frequency of the first optical terahertz signal is an integral multiple of the free spectral range of the optical filter.

The present invention relates to an adjustable multifunctional orthodontic acceleration device for animal experiments, comprising a power integration platform, a motor and a chewing model, wherein lamp beads are pre-embedded on the chewing model, and the power integration platform comprises a power module, a lamp bead driving module, a motor driving module, a matrix keyboard, a single-chip microcomputer, a load module, a debugging module and a single-chip microcomputer peripheral support device; the lamp bead driving module controls the switch state of the lamp bead, the motor driving module adjusts the input voltage of the motor to change the motor speed and thus change the vibration frequency, and the matrix keyboard is divided into an illumination group and a vibration group, which respectively control the lamp bead driving module and the motor driving module; one end of the motor is connected to the power integration platform, and the other end is connected to the chewing model. The present invention can realize the precise irradiation of near-infrared light with adjustable output power and stimulation duration on the orthodontic teeth of experimental animals, and transmit vibrations of different frequencies, can take into account a variety of stimulation modes, adapt to a variety of common experimental animals, and accommodate multiple animals for simultaneous experiments, and can easily convert between multiple parameters, significantly improving experimental efficiency.