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47results about How to "Suppression of high frequency interference" patented technology
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Low Output Voltage Fast Response LDO Circuit Based on Current Control Loop
InactiveCN102298407AGuaranteed response speedImprove stabilityElectric variable regulationElectricityIntegrator
The response ability to the transient change of the load is an important indicator of the LDO performance of the low dropout voltage regulator. The present invention learns from the loop control method of the charge pump type phase-locked loop, discloses a low output voltage fast response LDO structure based on the current control loop, the feedback voltage is converted into current, and the current signal is used as the carrier in the control loop. Operation, the difference current is integrated by the loop filter to form the control voltage of the power tube. Low-dropout regulators based on current control loops respond well to load transients and can produce voltage outputs lower than typical bandgap reference voltages. The fast-response LDO circuit based on the current control loop disclosed by the invention is composed of a voltage buffer, a transconductance amplifier, a loop filter, a power tube and an off-chip load.
Owner:NAT UNIV OF DEFENSE TECH
Method and system for randomly switching alternating current
ActiveCN101599660ASuppression of high frequency interferenceReduce lossEmergency power supply arrangementsPower compensationEngineering
The invention relates to a method and a system for randomly switching alternating current. The system comprises a voltage detecting circuit, a current detecting circuit, a first switching circuit, a second switching circuit, a control circuit, a pulse width modulator (PWM) and an APFC circuit, wherein the first switching circuit is used for switching on or off a main power supply; the second switching circuit is used for switching on or off a reserve power supply; the control circuit is used for controlling the first switching circuit and the second switching circuit to switch on or off and transmitting a pulse signal to the PWM; the PWM is used for modulating an output dutyfactor according to the pulse signal transmitted by the control circuit; the APFC circuit is used for receiving the output dutyfactor of the PMW so as to control the output current, and thereby the linear rectification of the output current is realized to ensure the synchronization of the output voltage and the current phase of the APFC circuit. The state of the power supply can be automatically recognized by adopting the random switching so as to adapt to power supplies in different environments, and the switching time is greatly reduced and fixed. The current linear rectification can be randomly switched as alternating current to solve the peak interference brought by the random switching, and the power compensation is carried out to realize the minimum loss of circuit power.
Owner:OCEANS KING LIGHTING SCI&TECH CO LTD
Accelerometer gyroscope horizontal angle measurement method based on Kalman filtering
InactiveCN105043348ASuppression of high frequency interferenceGuaranteed measurement accuracyAngle measurementIncline measurementGyroscopeAccelerometer
Belonging to the technical field of measurement of dynamic equipment systems, the invention relates to an accelerometer gyroscope horizontal angle measurement method based on Kalman filtering so as to solve the problem of poor precision in accelerometer gyroscope horizontal angle measurement under a dynamic measurement environment. The method includes: 1. utilizing an accelerometer and a gyroscope to collect data about X axis so as to obtain the acceleration and angular rate; 2. subjecting the obtained acceleration and angular rate to digital filtering so as to filter out high-frequency interference generated in the transmission process; 3. converting the filtered acceleration into angular speed; 4. according to the conversion angle, introducing a temperature compensation factor to obtain a compensated angle; and 5. subjecting the compensated angle and filtered angular rate to Kalman filtering, and performing data fusion so as to obtain a horizontal angle optimal estimation value for correction in a control system.
Owner:HARBIN INST OF TECH
Differential piezoelectric digital geophone
InactiveCN104237934AImprove anti-interference abilityHigh sensitivitySeismic signal receiversCapacitanceElectricity
The invention discloses a differential piezoelectric digital geophone. The differential piezoelectric digital geophone comprises a geophone core which comprises a cylindrical shielding case, a base, piezoelectric elements, mass blocks, a signal conditioning unit, a signal preprocessing unit, feed-through capacitors and outgoing cables. The base is arranged in the center of the shielding case and in rigid connection with the shielding case; the two groups of piezoelectric elements are symmetrically attached to two sides of the base, and the two mass blocks are symmetrically attached to the outer sides of one group of piezoelectric elements; the two groups of piezoelectric elements are connected with an input end of the signal conditioning unit through outgaining electrodes at two ends of the piezoelectric elements, an output end of the signal conditioning unit is connected with an input end of the signal processing unit, and an output end of the signal processing unit is connected with the outgaining cables through the feed-through capacitors. By means of the geophone core in the symmetrical structure, differential signal output and direct digital processing of signals, the differential piezoelectric digital geophone has the advantages of high flexibility, high antijamming capability, wide dynamic range, portability, durability and the like.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
Radio frequency amplitude keying demodulation circuit with large input dynamic range
InactiveCN102545949AImprove signal-to-noise ratioReduce power consumptionAmplitude demodulation by non-linear multiple-pole elementsAmplitude-modulated carrier systemsVoltage amplitudeLow voltage
The invention discloses a radio frequency amplitude keying demodulation circuit with large input dynamic range, which comprises an amplitude detection circuit, a Gaussian filter circuit, a peak detection circuit and two branches of difference amplitude keying demodulation circuits of a comparison circuit. The amplitude detection circuit is formed by a fixed gain amplifier with S poles in series connection and an amplitude detection and conversion circuit. Each branch of the amplitude keying demodulation circuits includes that input signals are amplified to i fuzzy amplitude keying signals through the amplitude detection circuit, the i fuzzy amplitude keying signals are added and converted into high-low voltage amplitude signals, high frequency components are filtered through the Gaussian filter circuit, the filtered signals pass through the peak detection circuit to obtain high-low average amplitude signals, and the average amplitude signals and the signals filtered by the Gaussian filter circuit are compared through the comparison circuit to obtain demodulation signals output by the radio frequency amplitude keying demodulation circuit. The radio frequency amplitude keying demodulation circuit with the large input dynamic range can be flexibly used for demodulating amplitude detection signals with modulation degree ranging from 0.5 to 0.9, thereby being capable of being applied to the front end of a radio frequency receiver with input signals reaching up to 60dB dynamic range.
Owner:JIAXING LIANXING MICROELECTRONICS
Multi-sensor data fused aviation coil inertial navigation device
InactiveCN104019812ASolve poor dynamic performanceImprove robustnessNavigation by terrestrial meansNavigation by speed/acceleration measurementsThree axis accelerometerTransmission line
The invention relates to a multi-sensor data fused aviation coil inertial navigation device, wherein the upper end of a suspending rope is tied on the bottom of a single rotor unmanned helicopter, the lower end of the suspending rope is tied on a cross-shaped support in an equal angle, the cross-shaped support supports a Z-component receiving coil, and three altitude sensors are equidistantly fixed on the Z-component receiving coil and are connected with a posture data recording system through signal transmission lines; each posture sensor consists of an MEMS three-axis gyroscope, an MEMS three-axis accelerometer and an MEMS three-axis magnetoresistive sensor. According to the multi-sensor data fused aviation coil inertial navigation device, the measurement on an air posture deflection angle of an aviation coil is realized; the multi-sensor data fused aviation coil inertial navigation device has the characteristics of small size, quick response and low cost; in addition, after performing the data fusion processing, the influence on swinging posture of the aviation coil in the environment can be effectively reduced, and the corrected inversion magnetic field data can meet the precision requirement of a system at a strongly swinging environment.
Owner:JILIN UNIV
Partial discharge signal processing method considering pulse extraction and signal denoising and partial discharge positioning method for power cable
ActiveCN109212391ARapid positioningQuick extractionTesting dielectric strengthSingular value decompositionDecomposition
The invention discloses a partial discharge signal processing method considering pulse extraction and signal denoising and a partial discharge positioning method for a power cable. The partial discharge signal processing method adopts a data processing order of ''first extraction, then denoising'', comprises the following steps of: decomposing a singular value, and comparing the optimal singular threshold with the largest singular value to realize a fast and precise positioning of a partial discharge pulse; extracting the partial discharge pulse; and denoising the extracted partial discharge pulse signal by refactoring the singular value. The partial discharge signal processing method considering pulse extraction and signal denoising and the partial discharge positioning method for the power cable can effectively suppress the white noise of the white regeneration of the partial discharge signal under lower SNR conditions based on the decomposition-reconstruction method of the singularvalue, and can suppress high-frequency interference by the denoising combining with a layer of discrete wavelet. Based on the partial discharge signal processing method described above, the partial discharge pulse is extracted, and the precise positioning of the partial discharge source (the partial discharge point) of the power cable can be realized.
Owner:SICHUAN UNIV
Method of controling a wind turbine generator
ActiveCN102214930AFast control dynamicsSuppression of high frequency interferenceWind motor controlSingle network parallel feeding arrangementsTurbineControl theory
A method for controlling a wind turbine generator is disclosed. The method comprises comparing an output power reference value and an actual output power value in a first control block with a first controller having a first control dynamics, comparing the output from the first control block with an actual generator shaft power value in a second control loop with a second controller having a second control dynamics, to determine a generator control signal, wherein the output power reference value is fed-forward and summed with the output of the first controller in the first control block. The disclosed method allows for fast reactions to changes in the output power reference value by the second controller regardless of the speed of the first controller.
Owner:VESTAS WIND SYST AS
Method and device for multi-meter acquisition simulation on basis of real-time monitoring
InactiveCN105679008ASuppression of high frequency interferenceHigh measurement accuracyTransmission systemsCommunication interfaceMaster station
The invention discloses a method and a device for multi-meter acquisition simulation on the basis of real-time monitoring. The device comprises a plurality of intelligent electricity meters for an acquisition simulation site, the intelligent electricity meters are communicated with a concentrator through a communication interface converter or directly communicated with the concentrator, and the concentrator is communicated with an information acquisition master station. Each of the intelligent electricity meters is internally provided with a voltage acquisition circuit, a current acquisition circuit and a temperature acquisition circuit, wherein the voltage acquisition circuit, the current acquisition circuit and the temperature acquisition circuit are all connected with a controller which uploads acquired data to the information acquisition master station. By real-time monitoring of currents, voltages and temperatures in operation of the intelligent electricity meters, real-time monitoring of operation states of the intelligent electricity meters can be realized, and when the intelligent electricity meters are in fault, timely alarming and corresponding regulations are carried out.
Owner:JINING POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO +1
Detection method for output signal of vehicle wheel speed sensor and circuit thereof
ActiveCN101793906AShorten the timeSave moneyDevices using electric/magnetic meansElectrical resistance and conductanceWheel speed sensor
The invention relates to a detection method for an output signal of a part of an automobile and a circuit thereof, in particular to a detection method for an output signal of a vehicle wheel speed sensor and a circuit thereof. A sensor signal is divided into a public end and a signal end, wherein the public end sets the public comparison end voltage to be 1 / 2 of mains voltage by a resistance partial voltage way; the signal end is connected with an adjustable resistor over the ground, and the adjustable resistor is used for load output; sensors of different types are adapted by changing the adjustable resistor; and a sine wave or square wave output by the wheel speed sensor is shaped into a standard square wave through comparing the 1 / 2 of mains voltage with the signal of the wheel speed sensor by a comparator. The invention is applied to an anti-skid brake system (ABS) / traffic control station (TCS) / electronic stability program (ESP) system of the automobile, can detect not only the signal of a magnetoelectric wheel speed sensor, but also the signal of a Hall type sensor.
Owner:NANJING AUTOMOBILE GROUP CORP
Digital TFT (thin film transistor) screen driver board circuit of video intercom system
InactiveCN102436797ASuppression of high frequency interferenceStatic indicating devicesClosed circuit television systemsImaging processingSignal processing circuits
The invention provides a digital TFT (thin film transistor) screen driver board circuit of a video intercom system. The digital TFT screen driver board circuit comprises a video signal processing circuit and a driver board circuit, wherein a video signal is input into the video signal processing circuit so as to be filtered and then is output to the driver board circuit, and the video signal processing circuit comprises a 'phi'-type filter circuit. Compared with the prior art, the digital TFT screen driver board circuit provided by the invention adopts a Huaya micro HTV791 chip as main image processing of a dot screen, a 'phi'-type filter circuit is additionally arranged at a video input port, and high frequency interference on a transmission line can be effectively filtered; and finally an image displayed on the TFT screen is obviously clearer than a like product.
Owner:FUJIAN GUANLIN TECH
Highly flexible non-twisting control cable
InactiveCN101834021AImprove cooling effectImprove mechanical propertiesConductive layers on insulating-supportsFlexible cablesEnvironmental resistanceInsulation layer
The invention provides a highly flexible non-twisting control cable, and belongs to the technical field of cables. The cable comprises a left and right bi-directionally twisted cable core; a foamed polyethylene buffer layer is externally extruded and covered on the cable core, a tin-plated copper band shielding layer wraps the foamed polyethylene buffer layer, and an external protection layer is externally extruded and covered on the tin-plated copper band shielding layer; the cable core comprises four groups of wire cores, filling materials and a PP lapping band, wherein the PP lapping band wraps the four groups of wire cores and the filling materials; and the cable core also comprises a conductor and a crosslinking polyethylene insulation layer externally extruded and covered on the conductor. The cable has the advantages of high electric performance, shielding performance, mechanical properties such as tensile property and twisting resistance, thermal resistance and ageing resistance, environmental resistance, chemical corrosion resistance and fire resistance, convenient use, no limitation of laying drop heights and the like; and the cable can be laid in fixed places, such as rooms, tunnels, cable trenches and tubes, where the shielding requirements are high, and the cable can be widely used and has better social and economic benefits.
Owner:YANGZHOU HUACHENG CABLE
High-voltage electric energy metering cabinet and method based on real-time monitoring
The invention discloses a high-voltage electric energy metering cabinet and a method based on real-time monitoring. A primary device voltage transformer and a current transformer are arranged at a high-voltage switch load side, and power of an electric energy meter and power of an acquisition terminal are provided by a secondary side of the voltage transformer; two voltage transformers are arranged at a high-voltage switch power side; the voltage transformers are connected with a voltage detection circuit; the current transformer is connected with a current detection circuit; a circuit where the high-voltage switch is is connected with a temperature detection circuit; the voltage detection circuit, the current detection circuit and the temperature detection circuit are all connected with a controller; and the controller uploads acquired data to an information acquisition main station. Through monitoring current, voltage and temperature when the high-voltage electric energy metering cabinet works in real time, real-time monitoring on the working state of the intelligent electric meter is realized; and when the intelligent electric meter fails, warning is timely carried out, and corresponding handling and adjustment are carried out.
Owner:JINING POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO +1
Wide-range alternating current signal zero-cross detection method and device
ActiveCN104991111AZero-cross detection implementationHigh precisionCurrent/voltage measurementEngineeringHigh pressure
The invention relates to a wide-range alternating current signal zero-cross detection method and device and belongs to the technical field of electronics. The wide-range alternating current signal zero-cross detection device comprises a rectification unit, a conversion unit, an amplification unit, a comparison unit and an output unit. For current type detection and voltage type detection, different conversion units and amplification units are designed. The conversion unit designed by the invention is used for achieving wide-range voltage zero-cross detection. According to the invention, no step-down circuit or voltage stabilization amplitude limiting circuit is adopted, direct processing of high voltage signals is conducted, influences of background noise or voltage thresholds on detection precision are reduced, zero-cross detection of large signals and small signals can be achieved at the same time, the precision is high, and wide practical value is achieved.
Owner:重庆恒锐金鼎感应科技有限公司
Voice identification circuit and translation system
PendingCN107863102ASuppression of high frequency interferenceFilter out noiseSpeech recognitionHomeostatic mechanismTranslation system
The invention discloses a voice identification circuit and a translation system. The voice identification circuit comprises a circuit board, a microphone array, a voice identification module, a microprocessor module, an audio frequency operational amplifier module, a loudspeaker and a voltage dividing module. The microphone array, the voice identification module, the microprocessor module, the audio frequency operational amplifier module and the loudspeaker are arranged on the circuit board and are sequentially connected with one another, the voltage dividing module is connected with the voiceidentification module, a plurality of control input ends are arranged on the voice identification module, the voltage dividing module comprises a plurality of voltage dividing branches, the voltage dividing branches are arranged between a power positive pole and a power ground in a connected manner, are connected with one another in parallel and comprise a plurality of resistors, the resistors are serially connected with one another to form the voltage dividing branches, and the various control input ends are connected with the various voltage dividing branches. The voice identification circuit and the translation system have the advantages that the voice identification circuit is low in cost, and the voice identification ranges and noise reduction effects can be dynamically balanced.
Owner:QINGDAO IGUAN TECH
Partial voltage monitoring anti-interference device
InactiveCN111624384ASuppression of high frequency interferenceGuaranteed anti-interference abilityVoltage/current isolationVoltage dividersInterference resistanceLow-pass filter
The invention relates to a partial voltage monitoring anti-interference device which comprises the components of a partial voltage monitoring system which has an input end that is connected with a to-be-tested power supply and is used for converting high voltage of the to-be-tested power supply into low voltage; the acquisition end of the data acquisition system is connected with the output end ofthe voltage division monitoring system through a signal transmission line, and the data acquisition system is used for acquiring and processing low voltage to obtain the voltage of the to-be-tested power supply; and the power supply is used for supplying power to the data acquisition system, the power supply comprises an isolation transformer, a distribution parameter attenuator and a low-pass filter, the distribution parameter attenuator comprises a first coil and a second coil, and the first coil and the second coil are both formed by winding twisted pairs. The isolation transformer and thelow-pass filter can effectively suppress interference of high and low frequencies, and the attenuator can ensure the anti-interference capability of the low-pass filter, so that interference introduced by a power supply can be effectively reduced.
Owner:SHENZHEN POWER SUPPLY BUREAU
Earphone in-place detection circuit and detection method
InactiveCN110012407AReduce false positive rateAvoid damageEarpiece/earphone mechanical/electrical switchesCapacitanceMagnetic bead
The invention provides an earphone in-place detection circuit and a detection method. The circuit comprises a main processor, an audio processor, an earphone in-place detection circuit, a microphone signal line, a left channel signal line, a right channel signal line and a key signal line, the earphone in-place detection circuit comprises a comparator, a first resistor, a second resistor, a thirdresistor and a fourth resistor, a microphone signal line is connected with one end of a magnetic bead, and a key signal line is connected with a GPIO port of the main processor; the left channel signal line is connected with a left channel port of the audio processor, and the right channel signal line is connected with a right channel port of the audio processor. A microphone signal line, a key signal line, a first sound channel signal line and a second sound channel signal line are respectively connected with a first capacitor, a second capacitor, a third capacitor and a fourth capacitor which are grounded, so that high-frequency interference introduced from the outside is suppressed; and grounded transient voltage suppression diodes are respectively connected to prevent static electricity from damaging the signal interface.
Owner:DATANG TERMINAL TECH
Filter circuit of ion source driving power supply and filter parameter detection method and device thereof
PendingCN112152582AFilter out high frequency interferenceAvoid damaging the power supplyMultiple-port networksResistance/reactance/impedenceCapacitanceIon source
The invention relates to a filter circuit of an ion source driving power supply and a filter parameter detection method and device thereof, and the filter circuit of the ion source driving power supply is an LC filter circuit, is connected in series between the ion source driving power supply and an ion source load, and comprises inductors connected in series and filter capacitors connected in parallel; the filter circuit is used for suppressing high-frequency oscillation of the real-time current waveform output by the ion source driving power supply and filtering out a high-frequency oscillation interference signal in the real-time current waveform. According to the technical scheme provided by the invention, the LC filter circuit of the high-frequency filter element, the series inductorand the parallel filter capacitor are adopted, so when the ion source driving power supply outputs power, the filter circuit can ensure that the ion source driving power supply outputs smooth direct-current voltage, high-frequency interference caused by instability in ion source load is filtered out, and the power supply is prevented from being damaged.
Owner:ZHONGSHAN IBD TECH CO LTD +1
Signal subdividing method and subdividing device for sine-cosine encoder, and motor control device
ActiveCN102270961BSuppression of high frequency interferenceOvercoming subdivision errorDynamo-electric converter controlHysteresisPhase difference
The invention discloses a signal subdividing method for a sine-cosine encoder. The method comprises the following steps of: sampling two paths of output signals, with a phase difference of 90 degrees, of a sine-cosine analogue signal to obtain sampling values A and B of the sine-cosine analogue signal; judging a quadrant with an angle Theta according to the sampling values A and B, specifically determining the angle Theta is in a first quadrant if A and B are both more than 0, determining the angle Theta is in a second quadrant if A is more than 0 and B is less than 0, determining the angle Theta is in a third quadrant if A and B are both less than 0 and determining the angle Theta is in a fourth quadrant if A is less than 0 and B is more than 0; subdividing the sine-cosine analogue signal according to a subdividing factor, setting hysteresis intervals at subdividing points, recording output values corresponding to each subdividing point in the range of 0 to 45 degrees and keeping theoutput value in the hysteresis intervals invariable; and looking up a table and outputting values 0 and 1 according to the quadrant with the angle Theta, a relative difference of absolute values of the sampling values and a tangent.
Owner:SHENZHEN HPMONT TECH
Ship power grid parameter real-time monitoring system and method
InactiveCN108982967AReduce Spectral AliasingFilter out high frequency interferenceFrequency analysisMeasurement using digital techniquesPower gridSpectral component
The invention discloses a ship power grid parameter real-time monitoring system and method. The ship power grid parameter real-time monitoring system includes a signal conditioning unit, a data acquisition unit, a data processing unit, a communication interface circuit, an external expansion memory, and a frequency detection module, wherein the signal conditioning unit comprises a resistor dividernetwork, a current transformer, and a low-pass filter; and the low-pass filter is arranged between the resistor divider network and the data acquisition unit or between the current transformer and the data acquisition unit. The ship power grid parameter real-time monitoring system effectively converts the energy of a bicycle brake into electrical energy. The ship power grid parameter real-time monitoring system introduces the low-pass filter LPF before sampling, thus filtering the spectral components higher than the sampling frequency in the continuous signal so as to reduce the possibility of spectrum aliasing, ensuring that the basic spectrum of the sampling signal maximally approaches to the spectrum of the original continuous signal, effectively filtering high frequency interference and avoiding sampling effects caused by harmonic pollution.
Owner:WUHAN UNIV OF TECH
Weak pulse signal amplification circuit and tiny dust detector
PendingCN111835303ANormal working pointIncrease profitAmplifier modifications to raise efficiencyAmplifiers with multiple amplifying elementsPhysicsCapacitance
The invention relates to the technical field of amplifying circuits. The invention provides a weak pulse signal amplification circuit and a tiny dust detector. The circuit comprises an input capacitor, an impact sensor, a charge-sensitive pre-amplification sub-circuit and a charge-sensitive post-amplification sub-circuit. The input capacitor and the impact sensor are electrically connected with the input end of the charge-sensitive pre-amplification sub-circuit; the charge-sensitive post-amplification sub-circuit and the charge-sensitive pre-amplification sub-circuit are cascaded to form a charge-sensitive amplification sub-circuit; the amplification factor of the charge-sensitive amplification sub-circuit is multiplied; the signal amplification capability of the charge-sensitive amplification sub-circuit is improved; when the impact sensor is in an idle state, the input capacitor is utilized to test the adaptation of the charge-sensitive amplification sub-circuit and the impact sensor, and when the impact sensor is in a detection state, the input capacitor prevents the performance of outputting a weak charge pulse signal to the charge-sensitive amplification sub-circuit so as to prevent the input capacitor from generating signal interference on the impact sensor.
Owner:HARBIN INST OF TECH
Cardiotachometer
InactiveCN107865649ASimple structureQuick responseOne-port networksAmplifier combinationsMicrocontrollerProcess module
The present invention proposes a heart rate meter, including a signal acquisition circuit, a filter circuit, an operational amplifier circuit, a processing module U4, and a display module U3; the signal acquisition circuit includes an infrared emitting tube D1, an infrared receiving tube Q1, and a resistor R1; the filter circuit includes a resistor R2 , R3, capacitors C1, C2, and C3; the operational amplifier circuit includes operational amplifier U1, operational amplifier U2, resistors R4, R5, R6, R7, capacitors C4, C5, and C6; the processing module U4 is a PIC16F84 microcontroller; the display module U3 is an LCD1602 Display modules. Compared with the prior art, the advantages and positive effects of the present invention are: the circuit structure is simple, the response is fast, the cost is low, the operation is stable, the heart rate of the subject can be measured quickly and conveniently at low cost, and it is easy to carry; The integrated anti-interference structure can filter out most of the high-frequency interference and ensure the reliability of the measurement results.
Owner:邵立新
Filtering connector assembly and automobile
PendingCN108418057ASuppression of high frequency interferenceVehicle connectorsSecuring/insulating coupling contact membersCapacitanceConductive materials
The invention provides a filtering connector assembly and an automobile. The filtering connector assembly comprises a shell, at least two conductive center shafts and feed-through capacitors, the shell is made of conductive materials, a containing cavity is formed in the shell, at least part of each conductive center shaft is arranged in the containing cavity, the conductive center shafts are fixedly connected with the shell and insulated from the shell, two ends of each conductive center shaft are exposed by two opposite openings, a first connecting structure is arranged at a first end, exposed by one opening, of each conductive center shaft, a second connecting structure is arranged at a second end, exposed by the other opening, of each conductive center shaft, and one feed-through capacitor penetrates the corresponding conductive center shaft. When the filtering connector assembly is used in a high-voltage circuit, a high-frequency filtering circuit can be formed by the aid of the equivalent inductance of a long cable at high frequency, and high-frequency interference of a high-voltage cable harness is obviously inhibited.
Owner:BEIJING ELECTRIC VEHICLE
Special testing equipment for electric shock safety protector
InactiveCN106054068AHigh precision switch bounce performanceDetect leakage currentCircuit interrupters testingMeasurement using digital techniquesMicrocontrollerElectrical resistance and conductance
The invention discloses a special testing instrument for an electric shock safety protector. The special testing instrument comprises a single chip microcomputer, wherein the single chip microcomputer is connected with a voltage detection circuit and a current detection circuit, the voltage detection circuit and the current detection circuit are each connected with the electric shock safety protector, the single chip microcomputer is connected with the electric shock safety protector through a first driving circuit and a resistance adjusting unit, the single chip microcomputer is connected with the electric shock safety protector through a second driving circuit, and the single chip microcomputer is further connected with the electric shock safety protector through a switching-on / off detection circuit. According to the special testing instrument, actuation time of the electric shock safety protector is obtained by means of the single chip microcomputer according to the time difference between a driving signal of the second driving circuit and an actuation signal of the electric shock safety protector, and switch bouncing performance of the electric shock safety protector can be obtained precisely on the basis of the actuation time; the current detection circuit can detect leakage current of the electric shock safety protector at different resistance values accurately; and the resistance value can be automatically adjusted through the resistance adjusting unit, so that the resistance value can continuously approach the minimum current required by actuation of the electric shock safety protector.
Owner:JINING POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO +1
Multi-sensor data fusion aviation coil inertial navigation device
InactiveCN104019812BSuppression of high frequency interferenceSolve the problem of poor dynamic performanceNavigation by terrestrial meansNavigation by speed/acceleration measurementsAviationGyroscope
The invention relates to a multi-sensor data fused aviation coil inertial navigation device, wherein the upper end of a suspending rope is tied on the bottom of a single rotor unmanned helicopter, the lower end of the suspending rope is tied on a cross-shaped support in an equal angle, the cross-shaped support supports a Z-component receiving coil, and three altitude sensors are equidistantly fixed on the Z-component receiving coil and are connected with a posture data recording system through signal transmission lines; each posture sensor consists of an MEMS three-axis gyroscope, an MEMS three-axis accelerometer and an MEMS three-axis magnetoresistive sensor. According to the multi-sensor data fused aviation coil inertial navigation device, the measurement on an air posture deflection angle of an aviation coil is realized; the multi-sensor data fused aviation coil inertial navigation device has the characteristics of small size, quick response and low cost; in addition, after performing the data fusion processing, the influence on swinging posture of the aviation coil in the environment can be effectively reduced, and the corrected inversion magnetic field data can meet the precision requirement of a system at a strongly swinging environment.
Owner:JILIN UNIV
Method and system for randomly switching alternating current
ActiveCN101599660BSuppression of high frequency interferenceReduce lossEmergency power supply arrangementsPower compensationAlternating current
The invention relates to a method and a system for randomly switching alternating current. The system comprises a voltage detecting circuit, a current detecting circuit, a first switching circuit, a second switching circuit, a control circuit, a pulse width modulator (PWM) and an APFC circuit, wherein the first switching circuit is used for switching on or off a main power supply; the second switching circuit is used for switching on or off a reserve power supply; the control circuit is used for controlling the first switching circuit and the second switching circuit to switch on or off and transmitting a pulse signal to the PWM; the PWM is used for modulating an output dutyfactor according to the pulse signal transmitted by the control circuit; the APFC circuit is used for receiving the output dutyfactor of the PMW so as to control the output current, and thereby the linear rectification of the output current is realized to ensure the synchronization of the output voltage and the current phase of the APFC circuit. The state of the power supply can be automatically recognized by adopting the random switching so as to adapt to power supplies in different environments, and the switching time is greatly reduced and fixed. The current linear rectification can be randomly switched as alternating current to solve the peak interference brought by the random switching, and the power compensation is carried out to realize the minimum loss of circuit power.
Owner:OCEANS KING LIGHTING SCI&TECH CO LTD
Power module for sensors used in mine safety monitoring
ActiveCN105896958BImprove anti-electromagnetic interference performanceSolve the problem of restart-proneApparatus without intermediate ac conversionElectromagnetic interferenceEngineering
The invention provides a power supply module for a mine safety monitoring sensor, and the module is integrally encapsulated by using epoxy resins. The power supply module includes a soft-start circuit, an anti-interference processing circuit, a first power output circuit and a second power output circuit. A power input end of the soft-start circuit is connected with a DC9-24.5V power supply when in use. A power input end of the anti-interference processing circuit is connected electrically with a power output end of the soft-start circuit. A power input end of the first power output circuit and the power input end of the second power output circuit are both connected electrically with a power output end of the anti-interference processing circuit. The power input end of the anti-interference processing circuit is the power output end thereof. A power output end of the first power output circuit outputs a +3V DC power supply. A power output end of the second power output circuit outputs a +5.5V DC power supply. The invention is applicable to the mine safety monitoring sensor, can effectively improve the anti-electromagnetic and anti-interference capabilities of the sensor, and solves the problem of proneness to restart when the sensor is under interference.
Owner:TIANDI CHANGZHOU AUTOMATION +1
Harmonic suppression circuit for electromagnetic compatibility laboratory and compensation method thereof
ActiveCN103401244BDoes not affect filtering performanceGuaranteed safe operationActive power filteringReactive power adjustment/elimination/compensationOvervoltageElectric power system
Owner:潘奇 +4
An EEG Acquisition System
ActiveCN112971810BEnhanced inhibitory effectSuppression of EMC interference increasesDiagnostic recording/measuringSensorsInstrumentation amplifierNoise level
The present invention relates to an EEG acquisition system, comprising an EMC protection circuit (100), used for receiving physiological signals on the surface of the forehead of a human body in real time, and converting the physiological signals into current signals; an instrument amplifier, used for receiving the processed EMC protection circuit the current signal, and amplify the current signal; the signal amplification circuit (200), is used to receive the current signal amplified by the instrumentation amplifier, and amplify the current signal again, so that the signal-to-noise ratio is further improved; AC coupling The circuit (300) is used to receive the re-amplified current signal, perform high-pass filtering and then couple to the instrument amplifier to form a coupling loop with high-pass filtering function. The invention enhances the stability of EEG signal acquisition, reduces the overall noise level, and greatly improves the signal-to-noise ratio of the overall acquisition circuit.
Owner:ZHEJIANG PEARLCARE MEDICAL TECH
Detection method for output signal of vehicle wheel speed sensor and circuit thereof
ActiveCN101793906BHigh currentSuppression of high frequency interferenceDevices using electric/magnetic meansElectrical resistance and conductanceSquare waveform
The invention relates to a detection method for an output signal of a part of an automobile and a circuit thereof, in particular to a detection method for an output signal of a vehicle wheel speed sensor and a circuit thereof. A sensor signal is divided into a public end and a signal end, wherein the public end sets the public comparison end voltage to be 1 / 2 of mains voltage by a resistance partial voltage way; the signal end is connected with an adjustable resistor over the ground, and the adjustable resistor is used for load output; sensors of different types are adapted by changing the adjustable resistor; and a sine wave or square wave output by the wheel speed sensor is shaped into a standard square wave through comparing the 1 / 2 of mains voltage with the signal of the wheel speed sensor by a comparator. The invention is applied to an anti-skid brake system (ABS) / traffic control station (TCS) / electronic stability program (ESP) system of the automobile, can detect not only the signal of a magnetoelectric wheel speed sensor, but also the signal of a Hall type sensor.
Owner:NANJING AUTOMOBILE GROUP CORP
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