53results about How to "Reduce high frequency interference" patented technology

The invention relates to the control of trajectory tracking of omni-directional mobile robots. In order to realize the precise control of the omni-directional mobile robot under the condition that theuncertainty of a dynamic model and the external disturbance exist simultaneously, and avoid the inversion operation, the technical solution adopted by the present invention is that: the omni-directional mobile robot trajectory tracking auto-disturbance control method uses an optimized reduced-order extended state observer to estimate the total disturbance of the omnidirectional mobile robot system, including unmodeled parts, parameter uncertainties and external disturbances, and uses a passive controller designed based on passive characteristics of the omnidirectional mobile robot system to compensate the disturbance estimated by the observer to achieve trajectory tracking control; the extended state observer actively takes the disturbance information from the input and output signals ofa controlled object to eliminate interference with control signals before the disturbance affects the system. The invention is mainly applied to the trajectory tracking and control of mobile robots.

An electrical plug connector includes a plug metal shell, an insulation housing bracket, a plug grounding contact, and a grounding member. The plug metal shell encloses a tongue portion of the insulation housing bracket. The plug grounding contact is held inside the insulation housing bracket. The grounding member is disposed between the plug metal shell and the plug grounding contact and spaced from the first side of the insulation housing bracket. A connecting portion is selectively disposed on the grounding member or on the plug grounding contact. The connecting portion mechanically contacts to the grounding member and the plug grounding contact such that the grounding member is electrically connected to the plug grounding contact.

The spacing decrease between pole tips of a write element and a magnetic medium that is associated with the write element is linearly proportional to an input signal, such as an input voltage or current, to a slider flying height controller for a hard disk drive. The flying height controller includes a heater current controller and a multiplexer. The heater current controller receives the input signal and outputs a control current proportional to the input signal. The multiplexer couples the control current to a heating element associated with the write element on a selected slider body during a read operation. The heating element dissipates a power that is proportional to the control current and causes a decrease in the spacing between the pole tips of the write element and the magnetic medium that is linearly proportional to the control current and to the input signal.

An electrical plug connector includes a plug metal shell, an insulation housing bracket, a plug grounding contact, and a grounding member. The plug metal shell encloses a tongue portion of the insulation housing bracket. The plug grounding contact is held inside the insulation housing bracket. The grounding member is disposed between the plug metal shell and the plug grounding contact and spaced from the first side of the insulation housing bracket. A connecting portion is selectively disposed on the grounding member or on the plug grounding contact. The connecting portion mechanically contacts to the grounding member and the plug grounding contact such that the grounding member is electrically connected to the plug grounding contact.

An apparatus for adaptively receiving, compensating, and transmitting data in optical fiber communication networks are provided. A receiver according to this invention includes at least one optical device for compensating distortion in a channel of an optical signal, at least one photodetector circuit for converting the optical signal into an electrical signal, at least one electronic device for further compensating the distortion in the electronic signal, a clock and data recovery circuit for generating a recovered data signal and a clock signal from the electronic signal, and a post-processing circuit.

The invention relates to a perturbation and observation method MPPT control method with a photovoltaic array self-adaptive step size. The control method includes the main steps that output voltage and currents of a photovoltaic array PV are sampled to obtain a P-U characteristic curve, PV end voltage corresponding to incomplete differential and PV end voltage corresponding to ideal differential are Ua and Ub respectively, and the PV end voltage is divided into an interval I (0-Ua), an interval II (Ua-Ub) and an interval III (>Ub). Forward disturbance is performed in the interval I with the step size of d1, reverse disturbance is performed in the interval II with the step size of (2 eta-1), and reverse disturbance is performed in the interval III with the step size of d1. Signal samples of a voltage sensor and a current sensor of a system are connected into a micro processor, all processing modules for executing the method are stored in a program storage unit, a pulse width modulation module (PWM) is connected into output of the micro processor, and the PWM outputs a drive signal to control a direct-current conversion circuit of the photovoltaic array to achieve maximum power point tracing. Tracing is carried out with the small step size close to the MPP and with the large step size in far intervals, the step size is adjusted in a self-adaptive mode, the antijamming capability is improved, PV power loss is effectively reduced, and the energy use ratio is effectively increased.

The invention discloses an EMC device which includes an apparatus that is easily interfered by high frequencies. The apparatus that is easily interfered by high frequencies is connected with a capacitance in parallel. The invention is connected with a capacitance in parallel on the apparatus that is easily interfered by high frequencies; when the frequency is low, the action of the capacitance is weak; when the frequency is high, the condenser component of the capacitance is diminished, the high frequency interference picked by the apparatus that is easily interfered by high frequencies gets short by the capacitance and can not be continuously spread, thereby reducing the high frequency interference and improving the performance of the EMC device.

The invention discloses a flow field pressure transducer of an immersion lithography machine based on PVDF. The transducer comprises a PVDF pressure sensing element containing a shielding film and a signal processing means composed of a voltage amplifier circuit, a charge amplifier circuit and a filter circuit. The PVDF pressure sensing element containing the shielding film generates charge signals which pass through a circuit formed by connection between the output terminal of a charge amplifier and the input terminal of a voltage amplifier, between the output terminal of a voltage amplifierand the input terminal of the filter circuit and between a matching BNC interface of the input terminal of the charge amplifier circuit and an BNC interface of the PVDF pressure sensing element containing the shielding film. The PVDF pressure sensing element containing the shielding film provided in the invention has the characteristics of high sensitivity, low impedance, good flexibility and thelike, is simple and convenient to install and produces little disturbance to a flow field. The signal processing means conditions the charge signals output by the PVDF pressure sensing element to become acquirable voltage signals of -5 to 5 V, and effectively inhibits null drift and noise interference.

The invention provides a brick-shaped filter module and a power supply component, and relates to the technical field of power sources. The brick-shaped filter module comprises a casing and an internalcircuit; the internal circuit comprises a first differential mode filter module, a first common mode filter module, a second common mode filter module and a resonance filter module; the first differential mode filter module used to filter out differential mode interference signals is connected with an output end of a power module; the first common mode filter module and the second common mode filter module are used to reduce common mode noise signals; the resonance filter circuit is used to reduce electromagnetic interference, and is capable of filtering out high-frequency interference effectively. The brick-shaped filter module can improve the quality reliability, simplify the structure compression volume, ensure the same height of the filter module and a brick-shaped power supply, and facilitate the same plane design and production of the equipment, thereby saving the space cost and the material cost, expanding applicable environments of the equipment because of the characters of miniaturization and high power, and having positive significance for miniaturization and densification of national defense industrial equipment and civil equipment.

The invention discloses an integration method of a leadless planar surface mounting type thick film hybrid integrated circuit. The method comprises the steps of directly manufacturing a planar external connecting end of a thick film hybrid integrated circuit on the bottom surface of a ceramic wafer, carrying out hybrid integration on the front surface and the bottom surface of the ceramic wafer, carrying out sealing and insulation protection on a thick film conduction band, a thick film stop band, a thick film capacitor and a thick film inductor by insulating dielectric thick films and carrying out coating and curing protection on a bare chip of a semiconductor by insulating dielectric paste. The method has the characteristics that (1) no packaging shell is adopted so that the size is reduced; (2) no pin or corresponding internal lead is adopted so that the high-frequency interference is reduced; (3) surface mounting type installation is realized so that the equipment size is reduced and the high-frequency performance of equipment is improved; (4) the system reliability of the equipment is improved. The integrated circuit produced by the method is widely applied to the fields of spaceflight, aviation, ships, electronics, communications, medical equipment, industrial control and the like and is particularly suitable for the fields of equipment system with the requirements on miniaturization, high frequency and high reliability.

The invention provides a method for setting a ground system in a complete machine of an LTE communication product. The method comprises the steps that: a ground signal of the complete machine is set, a backboard in the complete machine is fixed on a chassis of the complete machine through screws, and a ground copper band is designed on a printed circuit board; a backboard and other veneers are connected with a digital connector and a power connector through a positioning guide pin, and the pin lengths are sequenced from large to small as follows: the positioning guide pin, the digital connector and the power connector; the sidebands of the veneers are divided into different segments; and when the power connector and the digital connector on the backboard are selected, and the lengths of the signal pins on the power connector and the digital connector are sequenced from large to small as follows: a ground pin and other network pins. During hot plug of the veneers, it is guaranteed that a ground signal is preferably contacted than a digital signal. The method provided by the invention is used for sequentially processing various different ground plans in the complete machine system in combination with grounding, so that the complete machine has better EMC properties.

The present invention relates to an arrangement comprising a housing (2) and at least one busbar (4) for connecting a printed circuit board, which is arranged in the housing (2), to a power supply which is present outside the housing (2), wherein the housing (2) has an aperture (3) out of which the busbar (4) projects, wherein a ferrite core (10) and a moulded seal (5), which accommodates the ferrite core (10), are inserted into the housing aperture (3) in a media-tight manner, and the moulded seal (5) containing the ferrite core (10) surrounds the busbar (4) in a form-fitting manner.

The invention discloses an integration method of a lead-less ball pin surface mounting type high-density thick-film hybrid integrated circuit. The method includes the steps that on a ceramic substrate, an external connecting end of the thick-film hybrid integrated circuit is directly manufactured on the bottom face of the ceramic substrate, and the external connecting end is in the type of a metal spherical surface; hybrid integration is performed on the front face of the ceramic substrate, a thick-film conduction band, a thick-film stop band, a thick-film capacitor, a thick-film inductor and the like are sealed and protected in an insulated mode through thick insulating medium films; an unpacked semiconductor chip is sealed in a coated mode and protected in a curing mode through insulating medium paste; integration is performed in a 3D vertical lamination mode, and thus the integration density is improved. The method has the advantages that size is reduced substantially; high frequency interference is weakened; the length of the conduction band is reduced, and the frequency characteristic and the integration level are improved; the integration density is improved; equipment size is shrunken, and the high frequency performance is improved; equipment and system reliability is improved. The integrated circuit produced with the method is extensive in application and suitable for the field of miniaturization, high frequency and high reliability equipment.

The Coaxial Angular Velocity Sensor System is an electronic sensor, which processes and supplies the output signal of the inertial angular velocity with high accuracy and great reliability. The device consists of the main components: angular velocity sensor, analog-digital converter, microcontroller, temperature sensor, power source, mechanical anti-noise-proof chassis. The device's microprocessor comes with a signal processing algorithm that helps increase the accuracy of the device's output. Because of its compact size, high precision, and low cost, the device is used in high precision devices such as UAV cameras, or in life applications such as self-balancing vehicles.

Disclosed is a system and a method for reducing high frequency interference pickup by the read element of the magneto-recording head. The reduction is achieved by reducing the parisitic capacitance between certain elements of the magnetic head. In one embodiment, the areas of the pads and leads, including the areas of the leads over the S1 and the areas of the sensor leads, are reduced. A second implementation involves increasing the separation between the pads and leads and the substrate material. Copper studs or vias may be used to connect the contact pads and the underlying layers. A third implementation includes using a low dielectric constant material as a spacer layer between conductors (leads, pads, magnetic shields) and the substrate.

The invention discloses a flow field pressure transducer of an immersion lithography machine based on PVDF. The transducer comprises a PVDF pressure sensing element containing a shielding film and a signal processing means composed of a voltage amplifier circuit, a charge amplifier circuit and a filter circuit. The PVDF pressure sensing element containing the shielding film generates charge signals which pass through a circuit formed by connection between the output terminal of a charge amplifier and the input terminal of a voltage amplifier, between the output terminal of a voltage amplifierand the input terminal of the filter circuit and between a matching BNC interface of the input terminal of the charge amplifier circuit and an BNC interface of the PVDF pressure sensing element containing the shielding film. The PVDF pressure sensing element containing the shielding film provided in the invention has the characteristics of high sensitivity, low impedance, good flexibility and thelike, is simple and convenient to install and produces little disturbance to a flow field. The signal processing means conditions the charge signals output by the PVDF pressure sensing element to become acquirable voltage signals of -5 to 5 V, and effectively inhibits null drift and noise interference.

The invention discloses a low-ripple wave filtering device which comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, an inductor L1, an inductor L2 and an inductor L3. The capacitor C3, the inductor L1 and the capacitor C4 are sequentially serially connected with one another to form a closed circuit; the capacitor C2 is connected to two ends of the capacitor C3 in parallel, the capacitor C1 is connected to two ends of the capacitor C2 in parallel, the capacitor C5 is connected to two ends of the capacitor C4 in parallel, and the capacitor C6 is connected to two ends of the capacitor C5 in parallel; the inductor L2 is connected to two ends of the inductor L1 in parallel, and the inductor L3 is connected to two ends of the inductor L2 in parallel; a common end of the capacitor C1, the capacitor C2, the capacitor C3, the inductor L1, the inductor L2 and the inductor L3 is connected with an input end Vin; a common end of the capacitor C4, the capacitor C5, the capacitor C6, the inductor L1, the inductor L2 and the inductor L3 is connected with an output end Vout. Owing to the principle, the low-ripple wave filtering device has the advantages that direct-current ripple waves in filter signals can be effectively reduced, high-frequency interference can be decreased, and accordingly signals transmitted by microwave circuits are stable.

The invention discloses an electricity information acquisition terminal power supply and metering unit protection circuit. AC input ends are connected with common-mode chokes; output ends of the common-mode chokes are connected with high-throughput piezoresistors in parallel and are connected with low-resistance and high-power thermistors; the output ends of the low-resistance and high-power thermistors are connected with fast reaction piezoresistors; the fast reaction piezoresistors are connected with a rectifier unit; the rectifier unit is connected with an overvoltage amplitude limiting output unit; and the overvoltage amplitude limiting output unit is connected with a high-frequency switch conversion and control unit. The technical problems that a terminal is scrapped to bring losses to a user and the like since the electricity information acquisition terminal power supply and metering unit protection circuit in the prior art is easily damaged under a lightning impulse, a terminal component can be burnt out and a printed circuit board can be damaged are solved.

The invention discloses an immunity testing device for electric energy meters. The device comprises a bracket seat, tailstocks and a back plate, wherein the back plate is fixedly arranged on the bracket seat; the tailstocks are fixedly arranged on the back plate; current connection terminals, pulse terminals and voltage connection terminals are arranged on the back plate, and are electrically connected with electric energy meter detection equipment respectively; wiring terminals are arranged on each tailstock, and comprise one or more than one positive wiring terminal, a negative wiring terminal and a voltage wiring terminal; the positive and negative wiring terminals are connected in series; the front positive wiring terminal is connected with a positive current connection terminal, and the tail negative wiring terminal is connected with a negative current connection terminal; the voltage wiring terminals are connected in parallel; a voltage live wire L connection terminal is electrically connected with the front positive wiring terminal, and the voltage wiring terminals are electrically connected with a voltage null line N connection terminal respectively. According to the device, equipment can be more rapidly connected during high-frequency electromagnetic field immunity testing, and the lengths of connecting wires are maximally reduced to reduce high-frequency interference.

The embodiment of the invention discloses a current regulating circuit, which comprises a far-end voltage signal generating circuit, a signal optocoupler isolation circuit and a signal processing output circuit, and is characterized in that the signal optocoupler isolation circuit is electrically connected with the far-end voltage signal generating circuit and the signal processing output circuit,the far-end voltage signal generation circuit is used for generating a first voltage signal according to an input signal of the far-end voltage signal generation circuit and filtering the high-frequency signal in the first voltage signal to obtain a second voltage signal, the signal optocoupler isolation circuit is used for performing optocoupler isolation on the second voltage signal, and the signal processing output circuit is used for processing the signal outputted by the signal optocoupler isolation circuit and outputting a current signal. According to the current regulating circuit provided by the embodiment of the invention, the high-frequency signals in the voltage signals are filtered through the far-end voltage signal generating circuit, the high-frequency interference in the circuit is reduced, the remote current regulation is realized, and the reliability of the circuit is improved.

The invention discloses an integration method of a surface-mounted high-density thick-film hybrid integrated circuit without lead ball pins. The method is adopted on a ceramic substrate, and the external connection end of the thick-film hybrid integrated circuit is directly made on the bottom surface of the ceramic substrate, and connected externally. The end is a metal spherical type; hybrid integration is carried out on the front of the ceramic substrate, and the thick film conduction band, thick film stop band, thick film capacitor, thick film inductor, etc. are sealed and insulated with an insulating medium thick film; the semiconductor bare chip Use insulating dielectric slurry for coating and curing protection; use three-dimensional (3D) vertical stacking method for integration to improve integration density. The characteristics of this method are: ①The volume is greatly reduced; ②The high-frequency interference is reduced; ③The length of the conduction band is reduced, and the frequency characteristics and integration are improved; ④The integration density is increased; ⑤The equipment volume is reduced, and the high-frequency performance is improved; reliability. The integrated circuit produced by the method is widely used, and is suitable for the fields of equipment miniaturization, high frequency and high reliability.

The invention relates to a filtering phase discriminator type dynamic interferometry system, which is composed of an interference optical system, a photoelectric detector and a filtering phase discriminator system for performing optical interference measurement on the object to be detected. The optical interference system comprises light paths and a phase shifting device, and the filtering phase discriminator system is composed of a synchronic phase shift control circuit and a signal processing circuit. The measurement system provided by the invention can perform on-line measurement in severeenvironment, can obtain the measurement result only needing an interference graph, does not lower CCD resolution ratio and has no special requirement on measurement environment, and has the characteristics of strong interference resistance, high measurement precision, high signal noise ratio, high resolution ratio, short measurement time and the like.

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.

An embodiment of the invention provides a high-frequency harmonic isolation device and an operating method thereof. The high-frequency harmonic isolation device comprises a high-impedance harmonic isolation module and a harmonic low-pass module, wherein an output end of the high-impedance harmonic isolation module is an output end of the high-frequency harmonic isolation device, the high-impedanceharmonic isolation module is resonant in a high-impedance state within a harmonic frequency band to be isolated, the high-impedance harmonic isolation module comprises a capacitor and an adjustable inductor, and the impedance and frequency band of the high-impedance harmonic isolation module are adjustable; an output end of the harmonic low-pass module is serially connected with an input end of the high-impedance harmonic isolation module, an input end of the harmonic low-pass module is an input end of the high-frequency harmonic isolation device, the harmonic low-pass module is in a low-impedance state within the harmonic frequency band to be isolated, the harmonic low-pass module comprises a capacitor and an adjustable inductor, and the impedance and frequency band of the harmonic low-pass module are adjustable. The high-frequency harmonic isolation device and the operating method thereof can achieve the purpose of isolating and governing high-frequency harmonics, are adjustable inimpedance and frequency band, and can meet the requirements of isolating high-frequency harmonics in different situations.

Various embodiments include techniques for reducing high-frequency interference to a wireless communications channel emanating from a wired communications channel. The techniques are directed towards an application that determines a mode of a particular wired communications channel. The mode of the wired communications channel is indicative of the frequency ranges at which the interference is generated. The application further determines a frequency and / or bandwidth of the wireless communications channel. The application selects a slew rate that reduces the high frequency interference from the wired communications channel at the frequency and / or bandwidth of the wireless communications channel. The application thereby optimizes the reduction of the high-frequency interference from the particular wired communications channel to the particular wireless communications channel.