55results about How to "Large frequency adjustment range" patented technology

The invention relates to a magnetic device capable of performing facial beautifying and wrinkle removing on a human body and a beautifying method thereof. The magnetic device is composed of an AC filtering circuit, a rectifying and DC filtering circuit, a power factor adjusting and boosting circuit, a startup slow starting circuit, a high-voltage energy storage circuit, an energy-storage capacitor discharging circuit, a safety protection discharging circuit, an auxiliary power supply module, a computer control module and an adjustment display module. The beautifying method comprises the steps that a central part of an inductance coil is placed at the part which needs to be beautified, the inductance coil keeps a small distance away from the skin or is slightly contacted with the skin, or a piece of soft tissue paper is arranged between the inductance coil and the part to be beautified; the output frequency of the inductance coil is controlled to be between 30Hz and 300Hz by the computer control module; the output magnetic intensity of the inductance coil is controlled and adjusted by the computer control module so as to set the stimulation intensity which gives rise to contraction of subcutaneous muscles; the action time is set to be between 0.4s and 3.0s, the interval time is 1.0s-3.0s, the beautifying time is 15-30min for one time, beautifying is performed once a day, and 10 times form a course of treatment.

The invention belongs to the technical field of structure vibration control, particularly relating to a tuned mass damper frequency adjusting device and an implementing method thereof. The tuned mass damper frequency adjusting device comprises a bottom plate of a tuned mass damper, a mass block above the bottom plate and a linear movement-rotary movement transformation device, wherein the bottom plate is connected with the mass block through an elastic element; the linear movement-rotary movement transformation device is mounted between the mass block of the tuned mass damper and the bottom plate and comprises a transmission mechanism with racks and gears or a ball screw transmission mechanism; linear reciprocating movement of the mass block relative to the bottom plate is transformed into rotary movement of a rotating shaft by the linear movement-rotary movement transformation device; and a flywheel is fixedly mounted on the rotating shaft of the linear movement-rotary movement transformation device. The invention further provides a method for adjusting frequency by using the tuned mass damper frequency adjusting device. Frequency adjusting numerical values can be set accurately, the frequency is adjusted continuously and accurately, and the adjustment range is large.

The invention relates to frequency selection surfaces, in particular to an interelement strong coupling ultra-wide range-adjustable active frequency selection surface. A variable capacitance diode is directly loaded with bias voltage to change the capacitance value of the variable capacitance diode, and meanwhile interelement strong coupling is utilized for achieving moving of the whole structure in a resonance frequency ultra-wide range. A dielectric slab, metal layers, the variable capacitance diode and an inductor are arranged. The metal layers, the variable capacitance diode and the inductor are arranged on the front surface of the dielectric slab, the metal layers are vertical strip-shaped metal layers, the vertical strip-shaped metal layers are loaded with two horizontal strip-shaped metal layers with different lengths in the horizontal direction, and the distance between the vertical strip-shaped metal layers and the two horizontal strip-shaped metal layers with the different lengths is half of the length of the long strip-shaped metal layer in the two horizontal strip-shaped metal layers with the different lengths. The two horizontal strip-shaped metal layers with the different lengths are connected through the variable capacitance diode, the vertical strip-shaped metal layers are connected through the inductor, and the vertical strip-shaped metal layers are in seamless connection with the horizontal strip-shaped metal layers.

The invention discloses a frequency-adjustable broadband dynamic vibration absorber and a vibration absorbing method thereof. The vibration absorber comprises a base, a threaded rod perpendicularly installed on the base, a fixed vibration absorbing unit, at least one set of movable vibration absorbing units, nuts and a sliding metal plate; the fixed vibration absorbing unit comprises a fixed mass block and a fixed rubber block which are in vulcanization connection; each set of movable vibration absorbing unit comprises a movable mass block and a movable rubber block placed below the movable mass block; a rubber damping plate is arranged on the upper surface of the movable mass block located on the uppermost portion; the nuts are installed on the threaded rod through threads so that the all the rubber blocks and the all the mass blocks can be fixedly installed on the base in the axial direction; and the sliding metal plate is installed on the threaded rod in a sliding manner through a sleeve. The frequency-adjustable broadband dynamic vibration absorber is suitable for solving the abnormal vibration problem of a system or parts and is also suitable for the problem verification work in the vibration diagnosis process, the using range of the vibration absorber is widened, and the work efficiency is improved.

The invention, which belongs to an electronic circuit, more particularly relates to a circuit for detecting a differential capacitor. The invention relates to an all-digital detection apparatus of a differential capacitor. The apparatus comprises a digital controller (1), a digit programmable clock generator (2), a digit programmable waveform generator (3), a charge amplifier (4), a amplificationmultiple programmable instrument amplifier (5), a binary channel synchronization analog-to-digital converter (6). According to the invention, the digital controller is utilized to carry out programming control on clock source provided by the programmable clock generator, so that all output signal frequencies of the programmable waveform generator can be adjusted flexibly according to demands and a frequency adjusting range is large; An amplification factor G of the instrument amplifier is programmablly controlled by the digital controller; when a delta C is small, a delta C detection for a small signal has a high resolution by increasing the G value; when the delta C is large, the delta C detection for a large signal has a large detection range by reducing the G value. The control of the digital controller to all detection links of the differential capacitor is realized by programming, and links of bandpass frequency selection filtering, frequency mixing demodulation, lowpass filtering and the like are completed by software codes; besides, the hardware structure is concise and the flexibility of adjustment is good.

The invention provides a voltage controlled oscillator circuit, which consists of at least three stages of total difference unit circuits which are cascaded mutually and are completely same. The circuit has the advantages that: 1, the circuit is a CMOS voltage controlled oscillator circuit which has simple structure, high reliability, wide frequency regulating range, and can operate normally under extremely low power supply voltage; 2, the circuit can select a cascade mode of three-stage and above three-stage total difference units which are completely same; 3, source electrodes of positive feedback active load are directly earthed for improving one pass gain of the total difference units, thereby ensuring that the oscillator circuit can normally start oscillation under any condition; 4, a voltage clamping circuit plays a role of stabilizing amplitude of an output signal of the oscillator; and 5, when control voltage controls current in a tail current source of the difference unit to generate variation through certain V-I converting circuit, the oscillator circuit can generate output waveforms with different frequencies along with the magnitude of the tail current, as long as the current in the tail current source is invariable, the frequency of the output waveform of the oscillator circuit can be invariable.

The invention relates to a high-voltage large-power frequency conversion adjustable constant voltage source which comprises a signal generator and N signal processing circuits, wherein power sources for inner components of any two signal processing circuits are not grounded; each signal processing circuit is composed of a digital isolation switching circuit and a power amplifier module; a signal generated by the signal generator is synchronously output to all the signal processing circuits; after the signal is firstly processed by the digital isolation switching circuits of all the signal processing circuit, N high-precision isolated low-voltage alternate current signals are output, wherein N is an integer which is not less than 1; all the low-voltage alternating current signals are the same in amplitude, frequency and phase, and the amplitude and frequency of all the low-voltage alternating current signal can be synchronously adjusted; and all the low-voltage alternating current signals are output to the corresponding power amplifier modules treatment be amplified; and output ends of N power amplifier modules are sequentially connected in series so as to be utilized as the total output of the constant voltage source. The constant voltage source provided by the invention has the advantages that the output voltage and power accuracy is high, and the amplitude regulating range is large.

The invention discloses a multiplexing delay unit circuit, and aims to implement a delay unit circuit with multiplexing function, implement a loop oscillator of different delay unit stages with as low design overhead as possible and acquire multiple oscillator gains. The invention adopts the technical scheme that: the signal input end of a delay unit is connected with an analog switch circuit; and the analog switch circuit consists of a first analog switch K1 and a second analog switch K2, wherein the K1 is connected with a first input signal IN1 under the control of a first control signal C1, the K2 is connected with a second input signal IN2 under the control of a second control signal C2, and the other ends of the K1 and the K2 are connected with the signal input end of the delay unit. The multiplexing delay unit circuit can receive two paths of input; and an oscillator consisting of the multiplexing delay unit circuit can provide multiple gains, and the area and the power consumption overhead of the oscillator are greatly reduced compared with a conventional variable gain oscillator.

The invention relates to the technical field of medical equipment, in particular to a transcranial magnetic stimulation system which is characterized in that charge of an energy storage capacitor in a main motor box is quickly released, pulse current is introduced into a stimulation coil placed above the head, and a pulse magnetic field is generated around the stimulation coil; the magnetic lines of force noninvasively penetrate through the skin and the skull to the cranial nerve with small resistance, a conductible induction current is generated in the skull so as to stimulate the corresponding cranial nerve unit, and the transcranial magnetic stimulation system is simple and convenient to use, does not directly contact the human body, and can avoid cross infection caused by contact with the skin; the frequency adjusting range is large, single stimulation, programmed repeated stimulation and TBS pulse string stimulation can be achieved, the stimulation frequency, the stimulation intensity, the stimulation time and the intermittent time can be changed in a programmable mode, and bidirectional adjustment of nerve excitability is achieved through various stimulation modes; a friendly human-computer interaction interface is provided, medical record management and electronic prescriptions are built in, the system can be used in cooperation with electroencephalogram, and the cooling function of electric liquid absorption and electric liquid drainage is achieved.

The invention provides a linear vibration motor. The linear vibration motor comprises a base vibration unit with an accommodating space, an elastic part for suspending the vibration unit in the accommodating space and a coil for driving the vibration unit to vibrate; the elastic part is located on one side of the vibration direction of the vibration unit, and the coil and the vibration unit are opposite to each other and are arranged at intervals; the elastic part comprises a ring-shaped main body defined by elastic arms, a first fixed arm which extends from two opposite elastic arms of the main body and is fixed on the base, a second fixed arm extends from the other two opposite elastic arms of the main body and is fixed to the vibration unit, a reinforcing rib which extends from one of the elastic arms to the other elastic arm which is opposite to the elastic arm and is connected with the elastic arm, and damping parts which are at least attached to the local positions of the elasticarms. Compared with the related art, the linear vibration motor disclosed by the invention is high in vibration performance and long in service life.

Provided is a linear wide-range numerical control oscillator applied to an FPGA. The kernel portion of the numerical control oscillator is an annular oscillator body. Output frequency of the oscillator body can be selected according to a frequency selection control word. By means of the configurable characteristic of the FPGA, center output frequency of the numerical control oscillator can be flexibly changed, and accordingly the output frequency of the numerical control oscillator can be continuously and linearly adjusted in a wide range.

The invention discloses a variety of power wave output systems, including a control chip U1, a control chip U2, a frequency band adjustment circuit, a frequency adjustment circuit and an amplitude adjustment circuit. The control chip U1 is respectively connected to a duty cycle adjustment circuit, a waveform selection circuit, and a frequency band adjustment circuit The adjustment circuit, the frequency adjustment circuit, the power supply and the amplitude adjustment circuit, the amplitude adjustment circuit is also connected to the control chip U2, and the control chip U2 is also connected to the power supply, the amplitude attenuation circuit and the signal output terminal respectively. The system of the invention uses the chip ICL8038 as the core device, which can output square waves, triangle waves and sine waves at the same time, has a large frequency adjustment range, small waveform distortion, strong practicability, simple circuit structure and low cost, and is very suitable for popularization and use.

The invention discloses a double-wire double-arc digital submerged arc welding power supply, which includes a power supply module and a welding car, and a primary rectification module, a primary inverter module, a transformer module, and a secondary rectification module are sequentially connected between the power supply module and the welding car And the quadratic inverter model is fast. The three-phase 380V grid power supply is rectified by the power frequency rectifier bridge, and then supplied to the inverter to be converted into high-frequency AC, and then high-frequency transformation and rectification are performed. The output signal is controlled by feedback to obtain a smooth and continuously adjustable DC power supply. , sent to the secondary inverter for conversion, the inverter is converted into low-frequency AC, supplied to the welding car, and the workpiece is automatically welded by the welding car. The invention has the advantages of adopting the latest high-power IGBT switching device, high working efficiency, small no-load loss, stable welding current, large frequency adjustment range and high adjustment accuracy.

Provided is a configurable voltage-controlled oscillator applied to an FPGA. A ring oscillator serves as a core part of the voltage-controlled oscillator and is provided with extra digital control signals used for controlling frequency of an oscillation center. The control signals are configured by means of configuration information of the FPGA, center frequency of the voltage-controlled oscillator can be adjusted, and therefore output frequency of the voltage-controlled oscillator can be continuously adjusted within a large range.

The invention relates to a filter, a resonator and a communication device. According to the invention, in a process of reducing the temperature drift of the filter by optimizing the height dimension h1 of a metal resonance rod and the height dimension h2 of a boss, an adjusting screw rod is not limited by the resonator and the boss in the process of adjusting the position up and down, that is, in the process of reducing the height h1 of the metal resonance rod, the distance between the metal resonance rod and the top face of the boss in a traditional product does not need to be considered, and the height h1 of the metal resonance rod can be flexibly set according to actual requirements, so that the adjustable range is large, the height h2 of the boss can also be flexibly set according to actual requirements, the adjustable range is large, and the temperature drift of the product can be controlled to be within a preset range; and in order to reduce the temperature drift of the filter, the temperature drift of the filter can be controlled to be in a preset range by selecting an iron material with lower cost instead of adopting a copper material with higher cost, so that the product cost can be reduced at the same time.