142results about How to "Stable waveform" patented technology

A vertical vibrator is disclosed. The vibrator comprises a casing, a magnetic field part including a yoke and a magnet fixed to an inner surface of the yoke, a spring member fixed at one end to the casing and at the other end to the magnetic field part, a vibration part having a weight integrally mounted to the magnetic field part and vibrating together with the magnetic field part through the spring member, a vibration coil located below the magnetic field part for generating an electric field, and a magnetic fluid applied to an upper surface of the spring member corresponding to the magnet and fixed in position by a magnetic flux. The vibrator absorbs contact noise and impact caused by contact between the vibration part and the other members while ensuring convenient and appropriate positioning of the magnetic fluid, thereby having an extended life span.

The invention provides a network voltage disturbance generating device, which comprises a three-phase bridge type PWM (Pulse Width Modulation) rectifier and a three-H-bridge three-phase four-wire-system PWM inverter, wherein the alternating current side of the rectifier is connected with an electric network through an L type filter; the direct current side of the rectifier is connected in series with the direct current side of the three-H-bridge three-phase four-wire-system PWM inverter; an LC filter is connected to the alternating current side of the three-H-bridge three-phase four-wire-system PWM inverter; the output end of the LC filter is connected with an isolation transformer; and the secondary side of the isolation transformer is connected with a load. The invention further provides a control method suitable for the device. Due to the adoption of the device provided by the invention, the simulation of a network voltage amplitude, frequency disturbance and an electric network harmonic phenomenon can be realized, bilateral flow of energy can be realized, and active energy transmitted by tested solar-powered grid-connected equipment is fed back to the electric network; and the control method is easy and convenient to implement, and a target reference value can be accurately tracked; and moreover, quick response and small steady-state errors are realized, so that electric network disturbance can be simulated accurately.

The invention provides an anti-unmanned aerial vehicle detection system and a control method thereof. The system comprises a camera provided with an optical lens, a displayer, an automatic tracking servo mechanism controlling the camera to move, a radar device, a main controller, an interference unit, and an image identification decoder storing unmanned aerial vehicle image information. By the adoption of a photoelectric surveillance radar device combining the radar device with an optical tracking system, radar detection, optical image identification and electromagnetic interference are integrated, and the system and method play an important role in improving organic integration of unmanned aerial vehicle monitoring, the optical system and the radar device.

The invention discloses a shifting register, a grid-driven circuit and a display device. The shifting register comprises an input module, a first resetting module, a node control module, a first output module, a second output module and a cutting angle control module, wherein by virtue of setting the cutting angle control module and by virtue of mutual cooperation of the six modules, electric potentials of output scanning signals can change gradually, so that scanning signals with cutting angle waveforms can be formed; when the shifting registers of various grades sequentially input the scanning signals with cutting angle waveforms into pixel units in corresponding rows through grid lines of all the rows, the electrical impedance influence of each pixel unit can be reduced, the waveform stability of the scanning signals supplied to the pixel units in each row can be maintained, and thus the splash screen influence of a display panel is improved.

The invention relates to a synchronous rapid measuring method and device for ultralow frequency sinusoidal signal phase difference, belonging to the technical field of electronic measurement. By combining with the synchronous measurement technique and a virtual instrument technique, the phase value of a sinusoidal signal is obtained by utilizing partial wave form far less than a wave form period, so as to measure the ultralow frequency sinusoidal signal phase difference rapidly. The rapid measuring device comprises a first signal conditioning circuit, a second signal conditioning circuit, a first analog-to-digital conversion circuit, a second analog-digital conversion circuit, a first data register circuit, a second data register circuit, an interface circuit, a computer, an input and output circuit, a clock circuit and a logic control circuit. According to the invention, the phase difference of two paths of sinusoidal signals is obtained by utilizing the partial wave form of less than a period, thus avoiding multicycle wave from measurement and multiple-noise error influencing factors which exist in the traditional phase measurement method. The method and the device disclosed by the invention can be applied to making of ultralow frequency phase measurement systems and metering and aligning of ultralow frequency phase parameters.

The invention discloses a generating method of ultra-broad band monocycle pulse, the method comprises: generating a signal light; performing cross polarization modulation for the signal light and the detecting light; filtering the modulated detecting light by a filter and generating pulses with opposite polar on two vertical polarization states which are orthogonal mutually; performing the time delay processing for the pulses with opposite polar to compose to an ultra-broad band monocycle pulse-shaped light pulse; performing the light detection for the light pulse to generate an ultra-broad band monocycle pulse. The invention also discloses a generating device of the ultra-broad band monocycle pulse. The invention adopts the high non-linear optical fiber to implement the cross polarization modulation and filters the signal light interference by the filter to enable the waveform generated by the cross polarization to be stabilized; and the invention is convenient for implementing the coding and the modulating of the light carrying ultra-broad band signal based on users.

The invention provides a luminescence control circuit which is taken as a shift register unit circuit. The circuit comprises a first clock signal input end, a second clock signal input end, a third clock signal input end, a signal input end, a luminescence control signal output end, a constant high level voltage signal end and a constant low level voltage signal end, wherein an input control unit, a first pull-down unit, a second pull-down unit, a first pull-up unit and a second pull-up unit are connected between the signal input end and the luminescence control signal output end. The invention further provides a shift register, grid control nodes of ninth and tenth film transistors of an output level TFT have stable and controllable work voltages at each work stage, the ninth and tenth film transistors realize conduction by turns, and the simultaneous turn-off situation does not occur. According to the circuit, circuit output signal waveforms are stable, grid reliability is high, after simulation verification, output signal waveforms of each level of cascade circuits are stable.

The invention provides a power delay system for an automobile electric control unit, which is flexible and reliable to control, and low in cost and power consumption and meets the requirements of the conventional automobiles. The power delay system for the automobile electric control unit particularly comprises an electronic switch unit, an electric control unit, an automobile key ignition switch, a delay circuit and a signal verification unit, wherein the electronic switch unit comprises a power input end, a power output end, a first control end and a second control end; the power input end is connected with a low-voltage power supply of the automobile; the power output end is connected with the power input end of the electric control unit; the first control end is connected with the ON-gear power signal end of the automobile key ignition switch; the input end of the delay circuit is connected with the key on-off state signal end of the automobile key ignition switch; the output end of the delay circuit is connected with the first input end of the signal verification unit; the electric control unit receives a key on-off state signal of the automobile key ignition switch and outputs a control signal to the second input end of the signal verification unit; and the output end of the signal verification unit is connected with the second control end of the electronic switch unit.

The invention relates to a voltage stabilizing system, in particular to a boost chopping technology-based variable-frequency voltage stabilizing control system and a method, which belong to the electric automation field. The booster chopping technology-based variable-frequency voltage stabilizing control system mainly comprises a host computer, a program logic controller (PLC) 1, a variable-frequency system 2, a CC-LINK on-site bus 6, a remote monitor 5, a speed regulator 10 and a boost voltage frequency control conversion circuit; the PLC 1 is connected with the variable-frequency system 2 in a communication way through the CC-LINK on-site bus 6; the signal input end of the PLC 1 is respectively connected with an energy storage signal, an energy release signal and an alarming signal, and then the PLC 1 operates and processes the inputted data through a central processing unit CPU 13; and the output of the stabilized voltage of the system can be realized through a voltage/frequency (V/F) conversion circuit 24. The voltage stabilizing control system has good filter performance, a good energy-saving effect, good static performance and good dynamic performance, realizes the real-time monitoring, and improves the transmission accuracy and reliability of the control signal.

The invention discloses a method for automatically removing lower jaw interference from multi-channel electroencephalogram (EEG). A lower jaw action mark signal is recorded by two guide auxiliary electrodes while the EEG is required; each independent component, which is analyzed by performing fast ICA (independent component analysis) algorithm on the lower jaw action mark signal and the multi-channel EEG acquired by equipment, is compared; correlation analysis and calculation are performed, so that an independent source containing lower jaw action signal interference is automatically identified; the lower jaw interference signal in the independent source is removed; and finally the multi-channel EEG is acquired through reduction, so that the EEG with low relative pollution is acquired and the waveform is stable.

The invention discloses a shifting register. The shifting register comprises a first input clock port, a second input clock port, a signal input port, a signal output port, a plurality of P-channel thin film transistors and a plurality of capacitors, wherein the plurality of P-channel thin film transistors include a first P-channel thin film transistor, a second P-channel thin film transistor, a third P-channel thin film transistor, a fourth P-channel thin film transistor, a fifth P-channel thin film transistor, a sixth P-channel thin film transistor, a seventh P-channel thin film transistor and an eighth P-channel thin film transistor; the plurality of capacitors include a first capacitor, a second capacitor and a third capacitor; the first input clock port is connected to the fifth P-channel thin film transistor; the second input clock port is connected to the second capacitor; and the signal input port and the signal output port are connected to the seventh P-channel thin film transistor and the eighth P-channel thin film transistor. According to the light-emitting control circuit and the shifting register disclosed by the invention, waveforms of output signals of various cascade circuits are kept stable, and reliability is improved.

The present invention relates to a circuit which can reshape waveform of any base value voltage and peak value voltage into regular square wave. The prior waveform reshaping circuit produces a threshold value for comparing through a complex threshold value calculating circuit; and then reshapes the waveform, thereby having the shortcomings of complex structure and poor reshaping efficiency. The present invention reshapes the waveform through a method of delaying comparison. The reshaping circuit is a capacitance or inductance which backward moves the phase of the input waveform and a positive feedback circuit which consists of a voltage dividing resistor used for adjusting the noise margin, so that the waveform of any base value and peak value is reshaped into regular square wave to beneficial for the digital disposal. Thereby the present invention has a good reshaping efficiency. When in use of the infrared data communication system, the present invention has the advantages of greatly increasing the transmission speed and the transmission distance, well overcoming the various unbeneficial factors such as ambient light, photodiode current leakage and transmission power, and not being influenced by the trialing problem which is produced by the PIN when in high speed infrared communication.

The invention discloses a weak signal anti-interference detection processing method and device based on a Wheatstone bridge. According to the method, a Wheatstone bridge is formed by adopting a plurality of sensor elements, a direct current signal UI is generated and loaded to the A end and the C end to drive the Wheatstone bridge, the Wheatstone bridge is used for detecting a weak signal and converting the weak signal into an electric signal, and voltage signals output from the B end and the D end are obtained; the differential signals are amplified by the following amplifiers A1 and A2; a gate circuit controls a signal at a fixed frequency, output signals F and E after pre-amplification and filtering are switched and output and are transmitted to a differential amplifier A3 through a square wave-to-sine wave conversion circuit, the signal is converted into a sinusoidal signal with fixed frequency output, and the output amplitude of the signal is determined through the differential amplifier with fixed amplification times. The method is simple and easy to implement, the output signal is amplified to a certain degree on the basis of the original amplitude, the output signal is fixed to the frequency through switching of the fixed frequency, and therefore interference of noise on the signal can be effectively eliminated through subsequent phase-locked amplification detection.

Waveform data to define a waveform of a modulation wave are stored at a memory of a digital signal generation circuit (251). The digital signal generation circuit (251) outputs a digital signal in accordance with selected waveform data. A DA conversion circuit (252) converts the digital signal to an analog signal to output an original waveform of the modulation wave. The original waveform is amplified by an amplification circuit (255), and a therapy waveform is output.

The invention discloses a 780MHz wireless transceiver system based on IEEE802.15.4c standard. A transmitting module of the wireless transceiver system is used for transmitting data processed by a microcontroller chip to a radio frequency chip via SPI communication and then transmitting in the form of electromagnetic wave. A receiving module is used for transmitting collected data processed and analyzed by a main control chip via a serial port to an upper computer to be displayed visually. The transceiver system in this frequency band is low in interference and is mainly used for sensor network node, route and gateway in industrial internet of things site in internet of things system.

The invention discloses a method, a device and a respirator for voltage stabilization of continuous positive pressure ventilation. The method comprises the following steps: receiving a flow rate of a respirable gas in a pressurized flow, which is measured by a flow sensor, according to a preset time interval; ensuring a second derivative of the flow rate of a preset time point; acquiring an average flow rate, air leakage, an inspiration tidal volume and inspiration time; judging whether the average flow rate is greater than the air leakage; if so, determining a gain value to be a product of a value of a quotient of the inspiration tidal volume divided by the inspiration time minus the air leakage and a first coefficient; if not, determining the gain value to be a product of a value of a quotient of the inspiration tidal volume divided by the inspiration time minus the air leakage and a second coefficient, wherein the first coefficient is greater than the second coefficient; determining a respiration vector which is a product of the gain value and the second derivative; and controlling a driving signal of a baseline configuration pressure generator on the basis of the respiration vector and a pressure generator. The method foresees a flow rate variation trend through the respiration vector, controls the flow rate of the current time point, and guarantees stable output pressure of the respirator.

The invention discloses an RSSI (Received Signal Strength Indication)-based filtering method and system. The method comprises the following steps: paging a positioning target to obtain RSSI numerical values; performing median value filtering on p RSSI numerical values to obtain a first array, wherein p is an integer being greater than 3; performing IIR (Infinite Impulse Response) filtering on the first array to obtain a second array; and calculating a mean value of the second array to obtain an output value. The median value filtering is performed on the RSSI numerical values, so that the influence on pulse interference is lowered, and the defects of unstable input RSSI values and great fluctuation can be overcome. Through the IIR filtering, the contradiction of excessive output fluctuation due to an overlarge input proportion is overcome. The IIR filtering is performed on the RSSI numerical values being subjected to the median value filtering, so that an output waveform is smoothened effectively, and becomes more stable.