56results 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 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 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 discloses a pendulum eddy current tuned mass damper and a method for achieving structure vibration reduction and relates to the technical field of structure vibration reduction. Two bearings are fixed to the bottom of a top plate of a damper body, and the inner rings of the two bearings are connected through a horizontal rotating shaft. An oscillating bar is vertically arranged below the rotating shaft, the top of the oscillating bar is connected with the rotating shaft, a mass block is welded to the bottom of the oscillating bar, a plurality of permanent magnets are embedded in the two side faces, facing a front plate and a rear plate, of the mass block, and eddy current plates are arranged at the parts, corresponding to the mass block, of the front plate and the rear plate. Springs capable of vertically moving along the oscillating bar are arranged on the left side and the right side of the oscillating bar, and stepless regulation of the frequency of the damper can be achieved by regulating the distance between the springs and the rotating shaft. According to the damper, the moving state of the mass block is stable, the energy consumption mode is reliable, the frequency regulating range is large, and the damper can adapt to medium and high natural vibration frequency.

The invention discloses a CMOS low-gain wide-tuning-range fully integrated Ka-band millimeter wave quadrature voltage-controlled oscillator. A MOS variable capacitor tube array directly controlled by high and low levels is added into an oscillator resonant cavity to switch access capacitance so as to achieve multi-subband tuning for obtaining low-tuning gain, a wide regulating range, and good phase noise performance. In addition, a coplanar waveguide linear inductor used in the voltage-controlled oscillator has a high quality factor in order to achieve better phase noise performance. A circuit directly outputs a differential orthogonal signal with a high orthogonal precision (less than 1 degree). The phase noise of the voltage-controlled oscillator may reach -107.3dBc / Hz and -129.6dBc / Hz at the frequency offset 1MHz and 10MHz at the center frequency 30GHz, respectively. The voltage-controlled oscillator has total power consumption of 80mW, and can be used as a local oscillation signal source in a Ka-band wireless communication system or a voltage-controlled oscillator in a frequency synthesizer.