43results about How to "Avoid harmonic interference" patented technology

The embodiment of the invention provides a method for resisting high order harmonic interferences of a display screen MIPI (Mobile Industry Processor Interface) bus. Corresponding relationship between radio frequency communication bands capable of being used by a mobile terminal and safe frequencies of the display screen MIPI bus is pre-stored in the mobile terminal, wherein high order harmonics produced when the display screen MIPI bus works in the safe frequencies will not fall in the corresponding radio frequency communication band range. The method comprises following steps of detecting the radio frequency communication band currently used by the mobile terminal; searching the safe frequency of the display screen MIPI bus corresponding to the radio frequency communication band currently used by the mobile terminal according to the corresponding relationship; and setting the current working frequency of the display screen MIPI bus as the searched safe frequency of the display screen MIPI bus. The interferences of the high order harmonics of the display screen MIPI bus are avoided from the source by setting the working frequency of the display screen MIPI bus as the searched safe frequency.

The embodiment of the invention provides a method for resisting to higher harmonic interference of a camera MIPI (Mobile Industry Processor Interface) bus. Corresponding relations between RF (Radio Frequency) communication frequency bands capable of being used by a mobile terminal and safety frequencies of the camera MIPI bus are pre-stored in the mobile terminal, wherein higher harmonics generated when the camera MIPI bus works at the safety frequencies cannot fall in a range of the corresponding RF communication frequency bands. The method comprises the steps of detecting an RF communication frequency band currently used by the mobile terminal; according to the corresponding relations, searching the safety frequency of the camera MIPI bus, which corresponds to the RF communication frequency band currently used by the mobile terminal; and setting a current working frequency of the camera MIPI bus to be the searched safety frequency of the camera MIPI bus. By setting the working frequency of the camera MIPI bus to be the searched safety frequency, higher harmonic interference of the camera frequency is avoided from the source.

The invention discloses a random waveform weak signal detection method and system under the low signal to noise ratio. The system comprises a low noise amplifier, a phase-locked loop, a microprocessor, a digital frequency synthesizer and an operation module, wherein the frequency of a weak signal to be detected is locked by simulating the work of the phase-locked loop, the microprocessor is utilized to measure the output frequency of the phase-locked loop, a direct digital synthesis circuit is controlled to produce a common-frequency signal according to a frequency value, and the common-frequency signal serve as a reference signal required by relevant detection. The operation module adopts a multiplier and an integrating circuit to achieve relevant detection, enables a mutual correlation value to be maximum by adjusting the phase of the reference signal in a stepped mode, obtains a regeneration signal identical to the detected signal in frenquency and phase and accordingly achieves weak signal detection and amplification. Under the low signal to noise ratio condition, the random waveform weak signal detection method and system has good linear measurement characteristic and high accuracy and can achieve automatic detection and regeneration amplification of the random waveform weak signal.

The present disclosure relates to an interference coordination method and device, a base station, user equipment, and a computer readable storage medium. The interference coordination method comprises that whether inter-device interference exists between uplink and downlink transmission of the user equipment (UE) in the two frequency bands is judged; and if it is determined that the UE has inter-device interference between uplink and downlink transmission of the two frequency bands, in a time interval during which the UE is scheduled to send uplink transmission in at least one frequency band of two frequency bands, the sending of downlink scheduling information of one frequency band is sopped to the UE or in a time interval in which the UE is scheduled to send uplink transmission in at least one frequency band of two frequency bands, a blank subframe or a quasi-blank subframe is sent to the UE, or in a time interval of sending downlink scheduling information of one frequency band to the UE, the sending of the uplink scheduling information of at least one frequency band in two frequency bands to the UE is stopped. According to the embodiment of the invention, the aim of avoiding data channel interference in equipment can be achieved.

The invention provides a vibroseis slip sweep data acquisition and processing method and device. The method comprises the steps that vibroseis vibration signal record data and all records of ground force signal data acquired based on predetermined sweep signal, the distance between vibroseis groups and slip time parameters are acquired by the preset vibroseis slip sweep acquisition method; data division is performed on the vibroseis vibration signal record data according to vibroseis group vibration starting time so that the single shot vibration record of the shot point corresponding to each vibroseis group is acquired; and deconvolution processing is performed on the single shot vibration record by using all records of ground force signal data so that the high-fidelity seismic single shot data record can be acquired. With application of the vibroseis slip sweep data acquisition and processing method and device, the problem that the high-fidelity seismic data cannot be acquired by the vibroseis seismic exploration correlation method slip sweep efficient acquisition technology can be solved so that the fidelity of the original seismic exploration data can be guaranteed and the construction efficiency of field production can also be guaranteed.

A television includes a light source, a pulse-width-modulation (PWM) controller, and a control component. The PWM is coupled electrically to the light source, and is operable so as to generate a source control signal for controlling turning on and turning off of the light source. The control component is coupled to the PWM controller for controlling frequency of the source control signal outputted by the PWM controller. The control component has a plurality of control states that correspond to distinct display scanning frequencies of television standards, respectively. Setting of the control component in a selected one of the control states results in control of the frequency of the source control signal outputted by the PWM controller such that the frequency of the source control signal is not an integer multiple of the distinct display scanning frequency that corresponds to the selected one of the control states.

The invention discloses a receiver system and receiving method with the cognitive function. A radio frequency front end module is connected with a digital circuit module through an analog-digital conversion module. A radio frequency preselecting filter with the tuned bandwidth and under digital control is introduced to the radio frequency front end so that mirror image and harmonic interference can be effectively avoided and control can be convenient. Meanwhile, spectrum sensing and cognitive user data receiving are combined into a whole, a feature detection algorithm based on cyclic prefix correlation is adopted, spectrum sensing and data receiving can be conducted at the same time, intervention of signals of a main user can be found in time, a silent period is avoided, and communication efficiency is improved. In addition, idle channels can be provided for cognitive users and the current idle channels are continuously monitored. Under the condition that a local oscillator is not changed, spectrum sensing is conducted on other channels in an XMHZ and spare channels are provided. When the main user occupies an authorized frequency band again, the idle channels can be dynamically and intelligently switched in real time.

The invention relates to application of high-voltage variable-frequency control system in mine winder. Wherein, with asynchronous motor flexible draught closed loop as control strategy, generating proper frequency and amplitude and three-phase sine signal command by the controller according to error between given and feedback rotation speeds to send to high-voltage frequency converter to output ac power accorded with said request to drive motor with running performance rigorous coincidence with request; using IGBT chopping-wave resistance braking mode or of regenerative braking controlled rectifier for motor electric brake. This invention improves speed regulation quality of winder obviously, saves 30-40% energy, increases power factor more than 0.96, and solves difficulty of high-voltage heavy-power motor in four operating conditions.

The invention relates to an undervoltage tripper, comprising a rectification circuit, an electromagnet coil, am armature, a buck circuit, a relay, a sampling circuit and a main control module, wherein the rectification circuit is connected with an external power grid, and the armature is controlled by the electromagnet coil; the main control module stores a rated voltage Ue and a strong start voltage value and is used for collecting an output voltage and a voltage period of the sampling circuit, so that an effective value and a pulse direct current voltage value of the external power grid are calculated; when the voltage of the external power grid reaches to 80% of the rated voltage Ue, and the pulse direct current voltage reaches to the strong start voltage value, a normally open contact is closed firstly, and a switch circuit is turned on, after the armature is closed, the normally open contact is disconnected; and when the voltage of the external power grid is less than 50% of the rated voltage Ue, the switch circuit is turned off. The tripper is reliable in closing, small in coil heating value, strong in anti-interference capacity, and applicable to frequency conversion occasions like generators.

The invention discloses a dust collection device. The problems of poor collection effect and high electricity consumption amount of a dust collection device in the prior art are solved. A method adopted by the dust collection device for controlling an air suction motor to work comprises the following steps that 1, data is initialized; 2, when a waste sensor senses waste, a pulse number M, a pulsewidth value R and a pulse width change value delta R start to be calculated; 3, the pulse number M at the moment when preset time T is up is recorded, and a first pulse threshold value M1, a second pulse threshold value M2 and a pulse width change threshold value S are preset in a control circuit, wherein M1 is smaller than or equal to M2, and if the pulse number value M is smaller than or equal to M1 and the pulse width change value delta R is smaller than or equal to S, the first step is returned to; if M is larger than or equal to M1 and smaller than or equal to M2, the pulse width change value delta R is smaller than or equal to S, and the pulse width value R is decreased, the firs step is returned to; if the pulse number value M is smaller than or equal to M1, the pulse width change value delta R is smaller than or equal to S, and the pulse width value R is decreased, a PWM value output by the control circuit is decreased, and the rotation speed of the air suction motor is lowered; otherwise, the PWM value output by the control circuit is increased, and the rotation speed of the air suction motor is increased.

The invention provides an AC / UPS hybrid networking device and a method thereof. The device comprises: an AC distribution panel, a UPS connected with the AC distribution panel, and a control cabinet connected with the UPS and the AC distribution panel, wherein, the control cabinet comprises a comparative control circuit, a driving circuit and a high-speed silicon controlled static switch; the comparative control circuit sends a control instruction after comparing a received signal with a default reference signal; after receiving the control instruction, the driving circuit controls the high-speed silicon controlled static switch to strobe a corresponding current path which is directly connected with the AC distribution panel or connected with the UPS. Compared with the best technology of the normally used networking mode, the invention has the maximum benefit of reducing the average power consumption of more than 25 percent, also can basically avoid the harmonic interference and save the harmonic treatment expenses; as the hybrid networking equipment preferably selects AC as power, the dependence on the UPS is reduced, therefore, the quantity of the equipped UPS can be reduced, thus having the advantage of reducing the networking equipment investment.

The invention relates to an undervoltage tripper with low power consumption and applicable to a three-phase supply. The undervoltage tripper comprises an electromagnet coil, an armature, a rectification circuit, a buck circuit, a relay, line voltage detection modules, a sampling circuit and a main control module, wherein the main control module stores a rated voltage Ue and a strong start voltage value and is used for collecting an output voltage and a voltage period of each line voltage detection module, so that an effective value of each line voltage of the three-phase supply is calculated; when the effective value of each line voltage of the three-phase supply reaches to 80% of the rated voltage Ue and a sampling voltage of the sampling circuit reaches to the strong start voltage value, a normally opened contact is closed firstly, and a switch circuit is turned on, after the armature is closed, the normally open contact is disconnected; and when the effective value of any one line voltage is less than 50% of the rated voltage Ue, the switch circuit is turned off.

The invention relates to a low-power-consumption undervoltage tripper. The low-power-consumption undervoltage tripper comprises an electromagnet coil, an armature, a rectifying circuit, a step-down circuit, a relay, line voltage detection modules, a sampling circuit and a master control module. A nominal voltage Ue and a forced start voltage value are stored in the master control module, and the master control module is used for collecting the output voltage and the voltage period of each line voltage detection module so as to work out the effective value of each line voltage of a three-phase supply; when the effective values of all the line voltages of the three-phase supply reach 80% of the nominal voltage Ue at the same time and the sampling voltage of the sampling circuit reaches the forced start voltage value, the master control module controls a normally open contact to be closed and then controls a switching circuit to be closed, and after the armature is attracted, the master control module controls the normally open contact to be opened; if the effective value of any line voltage is lower than 50% of the nominal voltage Ue, the master control module controls the switching circuit to be opened.

The invention relates to an X-ray tube high-voltage power supply. The X-ray tube high-voltage power supply is characterized by comprising a push-pull inversion circuit, a high-frequency transformer and a low-ripple voltage doubling rectifying circuit.

The invention relates to an undervoltage release. The undervoltage release comprises a rectifying circuit connected with external power grid, an electromagnet coil, an armature controlled by the electromagnet coil, a voltage dropping circuit, a relay, a sampling circuit, a main control module which is stored with a rated voltage value Ue and a voltage value of forced startup; the main control module is used for collecting an output voltage and a voltage cycle of the sampling circuit in order to calculate an effective voltage value of the external power grid and a pulse direct current voltage value; when the voltage of the external power grid reaches 80% of the rated voltage Ue, and the pulse direct current voltage reaches the voltage value of forced startup, a normally open contact is controlled to close firstly, and then a switch circuit is controlled to switch on, and the normally open contact is controlled to open after the armature is engaged; if the voltage of the external power grid is less than 50% of the rated voltage Ue, the switch circuit is controlled to switch off. The undervoltage release is reliable in engagement, low in coil calorific value, strong in anti-interference capacity, and is applicable to frequency conversion occasions such as a generator.

The invention discloses a data transmission method, a data receiving method and a terminal. The data transmission method comprises the steps of acquiring a plurality of transmission units for transmitting data; determining at least one to-be-processed array according to the plurality of transmission units, wherein the to-be-processed array comprises N transmission units selected from the pluralityof transmission units, wherein each of the transmission units has an identification information; encoding the array to be processed to obtain the array to be transmitted; wherein size order of the identification information of the N transmission units in the array to be transmitted is not from small to large or from large to small; determinign target data according to that array to be transmit, and transmitting the target data to a receiving device. The invention is advantageous in eliminating signal periodicity when transmitting data, avoiding periodic waveform when transmitting data to be transmitted, thereby avoiding harmonic interference.

The invention discloses a zero-cross detection system. The system comprises a zero-cross signal sampling module, a power module and a direct current filtration module, wherein the zero-cross signal sampling module comprises a thunder-proof surge interference circuit and an inductor, the thunder-proof surge interference circuit is connected with an alternating current fire line input end, an alternating current zero line input end and a primary winding of the inductor and at least comprises a safety capacitor, the primary winding of the inductor and the safety capacitor constitute a first filtration circuit, and the primary winding of the inductor is connected to an alternating current grid in series; the power module comprises a bridge rectifier, a clamping circuit, a booster transformer and a primary side feedback system, the clamping circuit is connected with a second auxiliary winding of the booster transformer, a first auxiliary winding of the booster transformer is connected withthe primary side feedback system, and a buffer circuit is arranged on a secondary side winding of the booster transformer and a direct current voltage output end. The problems of delay of the samplingcircuit, poor sampling consistency and high loss can be solved.

The invention provides a harmonic-wave removing method in multi-seismic-source seismic data processing, and belongs to the field of oil exploration. The method comprises: (1) for multi-seismic-source single-shot data, each arrangement is taken as a unit, road rearrangement is performed according to a sort increment, and harmonic waves after the rearrangement are displayed on the data in random anomaly shape distribution; (2) regional anomaly attenuation testing and processing are performed on shot gather data after the rearrangement, and the harmonic waves in the random anomaly shape distribution are attenuated until being removed; and (3) the shot data obtained in the step (2) is recovered in anti-sorting manner according to a shot sequence and a road sequence, and the obtained shot gather data is shot gather data in which the harmonic waves are removed cleanly.

The invention relates to a motor drive control circuit and system. According to the invention, a starting circuit is arranged at the front end of a motor; the starting circuit can control the motor tobe started to generate induced electromotive force when the motor working in a counter electromotive force commutation mode is static, a corresponding observation waveform is obtained, and therefore,rotor position information of the motor is obtained; and meanwhile, a back electromotive force filtering and shaping circuit is arranged in front of a decoding circuit, and the input end of the backelectromotive force filtering and shaping circuit is connected between a main control circuit and the motor, so processing can be carried out according to a sampling signal and a back electromotive force signal of the motor, and filtering of the sampling signal and elimination of back electromotive force pulse sharp waves are realized, and therefore, the problem of interference in the low-speed operation process of the motor is avoided. Through a technical scheme of an embodiment in the invention, the motor can be controlled to be started at a low speed to obtain the position information of the motor rotor when the motor is in a static state, filtering optimization can be carried out on signals in the operation process of the motor, harmonic interference is avoided, and high driving reliability is achieved.

The invention provides a four-axis nanometer control system, and belongs to the technical field of numerical control machine tool control. The four-axis nanometer control system comprises a four-axis motion control platform, and the four-axis motion control platform comprises a first X-axis control platform, a second Y-axis control platform, a third Z-axis control platform and a fourth theta-axis control platform. The first X-axis motion platform is used for controlling the acceleration and the traction speed of the first target object in the X-axis direction; the Y shaft is mounted on the X shaft and is used for adjusting the distance between different second target objects; the third Z-axis control platform is used for controlling the first target object to move in the Z-axis direction; the fourth theta-axis is installed on the Y-axis and used for assisting the first X-axis control platform and the second Y-axis control platform to change the movement direction. The first X-axis control platform and the fourth theta-axis control platform are powered by a first direct-current voltage source, and the second Y-axis control platform and the third Z-axis control platform are powered by a second alternating-current voltage source. According to the invention, nanoscale four-axis motion control of the nozzle and the spinning process can be realized.

The invention discloses a receiver system and receiving method with the cognitive function. A radio frequency front end module is connected with a digital circuit module through an analog-digital conversion module. A radio frequency preselecting filter with the tuned bandwidth and under digital control is introduced to the radio frequency front end so that mirror image and harmonic interference can be effectively avoided and control can be convenient. Meanwhile, spectrum sensing and cognitive user data receiving are combined into a whole, a feature detection algorithm based on cyclic prefix correlation is adopted, spectrum sensing and data receiving can be conducted at the same time, intervention of signals of a main user can be found in time, a silent period is avoided, and communication efficiency is improved. In addition, idle channels can be provided for cognitive users and the current idle channels are continuously monitored. Under the condition that a local oscillator is not changed, spectrum sensing is conducted on other channels in an XMHZ and spare channels are provided. When the main user occupies an authorized frequency band again, the idle channels can be dynamically and intelligently switched in real time.

The invention relates to a low-power-consumption under-voltage tripping device. The low-power-consumption under-voltage tripping device comprises an electromagnet coil, an armature, a rectifying circuit, a voltage reduction circuit, a relay, line voltage detection modules, a sampling circuit and a master control module. The nominal voltage Ue and a forced-starting voltage value are stored in the master control module, and the master control module is used for collecting the output voltage and the voltage periods of the line voltage detection modules to calculate effective values of the line voltage of a three-phase power source; when the effective values of the line voltage of the three-phase power source reach 80% of the value of the nominal voltage Ue at the same time, and the value of the sampling voltage of the sampling circuit reaches the forced-starting voltage value, normally-open contacts are firstly controlled to be switched on, then a switching circuit is controlled to be switched on, and after the armature is attracted, the normally-open contacts are controlled to be switched off; if any effective value of the line voltage is smaller than 50% of the value of the nominal voltage Ue, the switching circuit is controlled to be switched off.

The invention discloses a system and method of a level control DC electromagnet. The system of the level control DC electromagnet comprises a signal trigger device, an NMOS transistor and an electromagnet, wherein the signal trigger device is electrically connected with the NMOS transistor, the NMOS transistor is electrically connected with the electromagnet, the signal trigger device is used forgiving out a control signal, the control signal is a high level signal or a low level signal, the NMOS transistor is used for acquiring changes of a high level and a lower level of the control signalto isolate and drive on / off of the electromagnet, and the electromagnet is isolated and driven to be opened when the control signal is detected to be the low level signal and is isolated and driven tobe closed when the control signal is detected to be the high level signal. With the adoption of a non-mechanical contact component to isolate and drive the electromagnet, and the equipment working potential risk brought by high frequency or long-term usage of the contact component to drive the electromagnet is solved; and with the adoption of a low level driving mode, the harmonic interference ofenvironment and circuit arrangement is effectively prevented, and normal working of the electromagnet is ensured.

The invention discloses a vehicle-mounted wireless communication GNSS and cellular coexistence interference suppression circuit structure which mainly exists in a common board of a GNSS system and 4G and 5G modems and mainly comprises cellular 4G and 5G radio frequency paths and a GNSS receiver radio frequency path. The cellular 4G and 5G radio frequency paths mainly comprise a radio frequency low-pass filter LPF and a wave trap circuit NOTCH1; the wave trap circuit NOTCH1 and the radio frequency low-pass filter LPF are separately constructed; the radio frequency low-pass filter LPF is a low-pass filter circuit formed by connecting two inductors in series, and the wave trap circuit NOTCH1 is composed of an inductor and a capacitor; the GNSS receiver radio frequency path mainly comprises a wave trap circuit NOTCH2, a high-pass filter HPF and a GNSS receiver; the high-pass filter HPF is mainly formed by connecting two capacitors in series; and the wave trap circuit NOTCH2 is composed of an inductor and a capacitor. According to the invention, the high-suppression LPF + NOTCH circuit is additionally arranged on the cellular radio frequency path, so that the harmonic spurious interference is reduced, and meanwhile, the NOTCH + HPF circuit is additionally arranged on the GNSS radio frequency path, so that the dominant wave signal strength is reduced.

The invention belongs to the technical field of system noise reduction, and discloses a computer system noise reduction method and system based on an intelligent chip. The computer system noise reduction system based on the intelligent chip comprises a noise and sound information acquisition module, a sound information conversion module, a noise signal acquisition module, a central control module,a noise signal detection module, a signal analysis module, an analog-to-digital conversion module, a noise reduction processing module and a stable output module. The active noise reduction technology is adopted through the noise signal detection module, and the purpose of screening out low-frequency noise signals from the noise signals is achieved; through the analog-to-digital conversion module, high-precision analog-to-digital conversion can be guaranteed, and meanwhile, the size and the production cost of the analog-to-digital converter are greatly reduced; the noise reduction processingmodule suppresses noise signals with small amplitude in the image signals and eliminates alternating voltage in the pulse voltage, so that the pulse voltage becomes smooth direct voltage, harmonic interference of a circuit can be avoided, and the noise reduction effect is achieved.