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 provides a control device of an air conditioner compressor. The control device comprises a main circuit unit and a weak-magnetic closed-loop regulating circuit, wherein the weak-magnetic closed-loop regulating circuit acquires working data information of the compressor from the main circuit unit, performs analysis and computation according to the acquired information, and supplies a control signal to a contravariant circuit of the main circuit unit so as to control the working voltage and working frequency of the compressor. The invention also provides a variable-frequency air conditioner with the control device of the air conditioner compressor. The invention further provides a control method of the air conditioner compressor. The control method comprises the following steps of: supplying power to the compressor by the main circuit unit; acquiring the working data information of the compressor from the main circuit unit by using the weak-magnetic closed-loop regulating circuit; performing analysis and computation according to the acquired information; and supplying the control signal to the contravariant circuit so as to control the working voltage and working frequency of the compressor. A power factor correction (PFC) circuit is matched with the weak-magnetic closed-loop regulating circuit to realize the high-efficiency and stable running of the compressor in a high-frequency area and a low-frequency area.

Provided is a bearing rotation torque test device. The center shaft of an axial loading member is connected with a thrust bearing and a spring spacer. A micro-load rod matches a pressure sensor connected with an axial loading sleeve. A measuring member is formed through clearance fit between the inner holes of two identical upper and lower detection bearings and a test shaft. The lower end of the test shaft is connected with an elastic coupler. The outer diameter of the upper detection bearing matches the axial loading sleeve mounted on the pressure sensor, and the outer diameter of the lower detection bearing matches a three-claw chuck mounted on a test bench. The shaft of a stepper motor is additionally equipped with a torque overload device, so damage to a torque sensor by detection overload is avoided. The thrust bearing, the spring spacer and the elastic coupler are provided with an aligning function, so the concentricity of the device is guaranteed. After loading, the three-claw chuck is released. The bearings are undirected, and are completely unaffected by tilting load and other pressures. The test values are more accurate. The trouble of detection tool replacement for test of bearings of different specifications is reduced. The problem that inaccurate values, poor repeatability and poor practicability are caused by loading deformation of the detection bearings is solved completely.

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 display panel which comprises a substrate, a first metal layer which is on a side of the substrate and includes a gate of a driving transistor, a second metal layer which ison a side of the first metal layer away from the substrate and includes a first base plate of a storage capacitor, a third metal layer which is on a side of the second metal layer away from the substrate and includes a data line, and a first shielding electrode which has a fixed potential, wherein an orthographic projection of the first base plate on the substrate partially coincides with an orthographic portion of the gate on the substrate, an orthographic projection of the data line on the substrate does not coincide with an orthographic projection of the gate on the substrate, and an orthographic projection of the gate on the substrate is in orthographic projections of the first shielding electrode and the first base plate on the substrate. In the above manner, the coupling capacitancebetween the gate of the driving transistor and the data line can be reduced, and therefore, the crosstalk phenomenon is reduced.

The invention discloses an oscilloscope with an external triggering function. The oscilloscope comprises a data sampling unit, an external triggering unit, a triggering control unit, and a sampling storage unit, wherein the data sampling unit is used for implementing digital sampling on a detected signal depending on a sampling clock to obtain sampling data; the external triggering unit is used for implementing level comparison treatment on an external introduced signal to generate an external triggering signal; the triggering control unit is used for implementing digital sampling operation on the external triggering signal, and also can be used for generating a triggering control signal depending on a result of the digital sampling; and the sampling storage unit for storing the sampling data depending on the triggering control signal to generate waveform display data for waveform display. According to the oscilloscope with the external triggering function, disclosed by the invention, the digital sampling operation is implemented on the external triggering signal to achieve the external triggering function, and the external triggering is realized by a digital part, so the precision error caused by discreteness, uncontrollable time delay, and the like of a simulating component is eliminated.

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, which belongs to the optical metrology field, discloses a calibration apparatus for laser micro energy, wherein the apparatus is used for calibration of a laser micro energy meter. The calibration apparatus comprises a calibrated laser light source, a pulse generator assembly, a measurement assembly and a computer system. The pulse generator assembly includes two choppers having different rotating speeds and clear apertures, so that continuous lasers output by the calibrated laser light source are chopped into pulse lasers with low repetition rates and low duty ratios. Besides,the measurement assembly uses two different detectors to respectively measure laser powers and pulse widths of the pulse lasers; and the computer system utilizes built-in software to collect measuring signals of the measurement assembly and a micro energy meter with calibration; and corresponded calculating formulas are employed to obtain calibration parameters. According to the invention, magnitude recurrence and magnitude transmission of laser micro energy are realized; and accurate recurrence can be carried out on laser energy with 1 muJ to 0.1 pJ.

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 invention discloses a digital control system and a method for step-up DC DC converter peak voltage, so as to solve the technical problem that the existing digitally-controlled step-up DC DC converter has a slow response speed. The method comprises steps: parameters are set; a sampling module samples output voltage of a power stage circuit; an analog-to-digital conversion (ADC) module carries out analog-to-digital conversion on the sampling signals; a digital proportional integral differential (DPID) module acquires control signals; a digital peak voltage prediction module calculates the duty cycle of an nth switching period of the power stage circuit switching transistor; a digital pulse width modulation (DPWM) module acquires gate driving signals; and peak voltage after the nth switching period of output voltage of the power stage circuit is controlled. The response speed of the control system can be effectively improved, the output voltage waveform of the converter is more stable, and the dynamic performance of the control system can be effectively 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.

The invention provides a nanosecond pulse optical fiber laser with low background ASE noise, high pulse peak power, flat pulse and long service life, and further provides a control method thereof. The laser mainly comprises a control unit, a source laser, a noise suppression laser, an optical fiber coupler, a four-port optical fiber circulator, a four-stage optical fiber amplification part and a feedback part. By adopting the four-port optical fiber circulator and an FBG (fiber bragg grating) structure, the nanosecond pulse optical fiber laser realizes the amplification of four-stage optical pulse and can generate an optical pulse sequence with high peak power and high signal-to-noise ratio; by utilizing the noise suppression laser, the nanosecond pulse optical fiber laser realizes the control of inverted particle population in doped optical fibers, thereby suppressing the ASE background noise generated by an optical fiber amplifier and leading the wave form of output pulse laser to be flat. Meanwhile, as the gain-clamping technology is adopted to control gains of pulse light through the doped optical fibers, the source laser and the noise suppression laser work nearby the threshold current when not sending the optical pulse, thereby prolonging the service life.

The invention discloses a method and device for detecting heart rat. The method includes: collecting a heart rate signal; extracting heart rate features from the waveform corresponding to the heart rate signal; judging whether the heart rate features conform to preset conditions or not; if so, outputting the corresponding heart rate according to the heart rate signal. The method has the advantages that due to the fact that the waveform of the normally detected heart rate signal has some common features, whether the heart rate detection is performed under normal conditions or not can be judged according to the features of the waveform, the heart rate signal under the normal conditions is stable in waveform, whether the waveform changes or not needs not to be detected constantly, the heart rate can be fast calculated favorably, the correct heart rate can be obtained by using the heart rate signal under the normal conditions to calculate the heart rate, and mistakes can be avoided.

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 digital ultra wide band comb-shaped spectrum signal generator which comprises an amplitude limiter, a comparator logic converter, a differentiator, a wide band switch, a high-pass filter, a switch drive circuit and a power module. The signal output end of the high-pass filter serves as the digital ultra wide band comb-shaped spectrum signal output end. Double-way amplitude limitation is conducted through the amplitude limiter and a device is prevented from being burned out by influence of strong signals; input signals of a comparator are compared with zero, so that square wave clock signals are generated; the square wave clock signals are combined with the high level through the logic converter and then are output, the rising edge or the falling edge of square waves is improved; the rising edge or the falling edge is charged or discharged through the differentiator, so that narrow pulses are generated; then the pulses pass through the wide band switch, time domains are multiplied, required pulses are output after modulation, and the interval of spectral lines is controlled; finally, the high-pass filter is used for high-pass filtering and low-frequency rejection; meanwhile, a modulation period is sampled through the switch drive circuit, so that a comb-shaped spectrum with the ultra wide band, the adjustable spectral lines and the stable waveform is obtained.

The invention provides a motor drive device, a motor assembly employing the same and a load drive device. The motor drive device includes a start control circuit and a bridge-type circuit. The bridge-type circuit includes a first bridge arm and a second bridge arm. The first bridge arm includes a first and a second bidirectional electronic switch connected in series. The second bridge arm includesa third and a fourth bidirectional electronic switch connected in series. The first bridge arm and the second bridge arm are connected between a first terminal and a second terminal of an AC power source in parallel. The synchronous motor is connected between a connection point of the first and the second bidirectional electronic switch and a connection point of the third and the fourth bidirectional electronic switch. The start control circuit controls the first and the fourth bidirectional electronic switch and a second and a third bidirectional electronic switch to connect in an alternating manner in a state stage of the motor and provides continuous drive force for the synchronous motor in each cycle of the AC power source.

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.

The invention relates to a drive circuit with emergency power supply for a fluorescent lamp for tree growth. The technical problem to be solved is that the provided drive circuit with the emergency power supply for the fluorescent lamp for tree growth is simple in structure and capable of providing stable and ceaseless current for the fluorescent lamp. The drive circuit with the emergency power supply for the fluorescent lamp for tree growth comprises a rectifier-filter circuit, a step-down circuit, a light source circuit, and an emergency circuit; the drive circuit is suitable for the field of agricultural trees.