111results about How to "Reduce the effects of electromagnetic interference" patented technology

The invention discloses an optical voltage transformer which is composed of a light source, a coupler, a polarizer, a phase modulator, a polarization delay optical cable, a collimating lens, a faraday rotary mirror, an electro-optical sensing unit, a photoelectric detector and a signal processing module, wherein the electro-optical sensing unit is composed of a bismuth germinate and an A and a B electrodes which are respectively installed on an upper and a lower panels of the bismuth germinate. The invention adopts the technical proposal that an electric field leads to the change of the refractive index of the sensing bismuth germinate in the electro-optical sensing unit, the phase difference of two cross-line polarized lights passing through the bismuth germinate is changed due to the Pockels effect, and the magnitude of the electric field can be indirectly measured by measuring two coherent lights.

The invention relates to the technical field of automobile power batteries. Due to the fact that a general battery management system adopts an embedded system, the system resources are scarce and remaining capacity of the power batteries cannot be evaluated accurately. The invention discloses a real-time evaluation method for the remaining capacity of the power batteries and a device of the real-time evaluation method. A control unit of a data acquisition terminal is communicated with the battery management system by controlling an inside controller area network (CAN) interface to acquire battery data of a battery pack, and transmits the acquired data to a general packet radio service (GPRS) module which transmits the acquired data to a GPRS wireless network. An upper computer receives the data through the GPRS wireless network, and processes the data of the power batteries through an extend Kalman filtering algorithm to accurately calculate the system on a chip (SOC) value. Finally, the GPRS wireless network transmits the calculated SOC value to the data acquisition terminal to perform display. Therefore, the real-time accurate evaluation on the remaining capacity of the automobile power batteries can be achieved.

The invention provides a direct-current filter inductor and a manufacturing method thereof. The direct-current filter inductor comprises a magnetic core, at least one first winding and at least one second winding. The magnetic core is provided with at least one air gap. The first winding and the second winding are connected with each other in parallel and are respectively coiled on the magnetic core. The difference value between the inductance value of the first winding and the mutual inductance value of the first winding and the second winding is smaller than the difference value between the inductance value of the second winding and the mutual inductance value of the second winding. The direct current resistance of the first winding is larger than that of the second winding. The first winding is closer to the air gap than the second winding. The direct-current filter inductor is formed by two independent inductive windings which are coiled on the same magnetic column and are connected with each other in parallel, achieves separating of alternate current and direct current of the windings through coupling, and is capable of reducing alternating current loss of the windings, improving magnetic flux distribution near the air gap, and reducing influence of electromagnetic interference.

The present invention is cylinder induction type self sensing method and system for MR damper. One induction coil is wound onto the cylinder of single-cylinder piston type MR damper and excited with the harmonic magnetic field of the exciting coil wound on the piston head of the MR damper to output information of relative displacement state between the piston rod and the cylinder, and this constitute the basic structure of cylinder induction type integrated relative displacement sensor. One active magnetoelectric relative displacement sensor is integrated to the MR damper structure to realize the real-time detection of relative displacement information between the controlled target and the supporting body. The continuous damping force controlling characteristic of magnetic reological fluid damper is combined to make the semi-active damping system of MR damper possess continuously controllable self sensing and damping force.

The invention discloses a differential GPS based tracked autonomous navigation robot and navigation method thereof. The robot includes a left DC brushless motor, a right DC brushless motor, a left rotary encoder, a right rotary encoder, a dual DC brushless motor driver, a vehicle-mounted antenna, a vehicle-mounted board card, an industrial control computer, a lithium battery pack, a network camera, a front GNSS receiver, a rear GNSS receiver, an image and data transmission radio station, and a 3D laser radar. The navigation method includes: manually and remotely control the robot to move firstly, reading and recording differential GPS data and encoder data in real time, and establishing original trajectory information and saving the original trajectory information as a standard file; correcting and optimizing an original trajectory to obtain a planned trajectory; and finally allowing the industrial control computer to read the differential GPS data, obtaining a pose of the current robot, comparing the pose and the pre-stored trajectory information to obtain a pose error, inputting the pose error into a feedback control law, obtaining a control output, and realizing trajectory tracking. The differential GPS based tracked autonomous navigation robot and navigation method has advantages of accurate positioning, accurate control and high stability.

The invention relates to a power unit control plate of a high-voltage frequency converter. The power unit control plate is connected between a main control plate of the high-voltage frequency converter and a power unit of the high-voltage frequency converter, and is a receiving-transmitting serial communication structure; receiving serial communication is defined from the main control plate to the power unit, and transmitting serial communication is defined from the power unit to the main control plate; and an input serial communication signal firstly passes through an input buffer filter circuit to filter out an interfering signal so as to enhance the current drive capability and interference-free feature of the signal, thereby furthest reducing the electromagnetic interference influence in communication. The power unit control plate comprises an address dip switch which is connected with a programmable logic device and is corresponding to the address of a component in the power unit, thereby guaranteeing that a command is accurately and reliably transferred. A temperature sensor is used for measuring the temperature of the component in the power unit and transferring a characteristic curve to adjust the opening voltage of the component so that the opening loss of the component reaches the optimum.

The invention provides a level shifter for an array substrate gate driving circuit. The level shifter comprises a first input end, a second input end, a third input end, a fourth input end, an output end, a first resistor and a second resistor; the first input end receives a logic control signal; the second input end receives a reference voltage; one end of the first resistor receives a first voltage, and the third input end is connected to the other end of the first resistor so as to receive the voltage from the first resistor; one end of the second resistor receives a second voltage, and the fourth input end is connected to the other end of the second resistor so as to receive the voltage from the second resistor; the output end alternatively outputs the voltage received by the third input end and the voltage received by the fourth input end according to the logic control signal and the reference voltage. According to the level shifter, variable resistors are additionally arranged to control the slope of output voltage variation of the output end, a level shifter output current ripple is reduced, and meanwhile the effect of reducing electromagnetic interference is achieved.

The invention belongs to the technical field of DC-AC inversion equipment and relates to a switch coupling inductor soft switching single-stage boost inverter with high voltage gain. A first winding and a second winding are dotted terminal, one end of an inductor is connected with the positive electrode of a DC power source, the other end of the inductor is connected with the negative electrode of a second capacitor, the positive electrode of the second capacitor is connected with a three-phase voltage bridge type inverter circuit, the negative electrode of a first rectifier diode is connected with the second winding of a coupling inductor, the first rectifier diode and the coupling inductor are connected at the two ends of the second capacitor in parallel after being connected in series, the positive electrode of a second rectifier diode is connected with the positive electrode of the first rectifier diode, the negative electrode of the second rectifier diode is connected with the common terminal of the first winding and the second winding and the positive electrode of a first capacitor, and the negative electrode of the first capacitor is connected with the negative electrode of the DC power source and the three-phase voltage bridge type inverter circuit. The switch coupling inductor soft switching single-stage boost inverter with the high voltage gain is simple in structure, small in electromagnetic interference influence, low in loss, low in cost, high in energy conversion efficiency and friendly to work environment.

The invention provides an internal layout structure of a switched reluctance machine controller of an electric vehicle. The internal layout structure comprises a high-voltage part, a low-voltage part and a radiator base (13). The high-voltage part comprises an IGBT module (1), a thin-film capacitor (2), a high-voltage copper bar and a pre-charge contactor (3). The high-voltage copper bar comprises a copper bar positive electrode (4), a copper bar U positive electrode (5), a copper bar U negative electrode (6), a copper bar V positive electrode (7), a copper bar V negative electrode (8), a copper bar W positive electrode (9), a copper bar W negative electrode (10) and a copper bar negative electrode (11). The low-voltage part comprises a low-voltage main control board (12) and a low-voltage connector (17). The low-voltage connector (17) is connected with the low-voltage main control board (12), the high-voltage part is arranged on the radiator base (13), and the low-voltage part is arranged above the high-voltage part. The hierarchical design of the high-voltage part and the low-voltage part is adopted in the longitudinal direction, and the internal layout structure is simple, compact in layout structure, high in system reliability and suitable for large-scale batch production.

The invention relates to a high-voltage switch gear and a gas state monitoring device thereof. The gas state monitoring device comprises a processor module, a data transmission module and a sleep awakening trigger module, wherein the processor module is a long-sleep module, and is provided with a signal input end for receiving detection signals of a gas parameter acquisition module and a signal output end for making connection with the data transmission module; the sleep awakening trigger module is provided with a port for receiving the detection signals of the gas parameter acquisition module; and the output end of the sleep awakening trigger module is connected with an awakening trigger end of the processor module, and used for triggering and awakening the processor module when the gas state signal change exceeds the set threshold. When the gas parameter data greatly changes, the sleep awakening trigger module triggers the processor module from the sleep state to the operating state, thereby effectively lowering the energy consumption of the processor module in the high-voltage switch gas state monitoring process, and correspondingly enhancing the energy utilization efficiency of the processor module.

The invention discloses a distributed time sequence trigger control system. The system comprises a plurality of time sequence controllers and an optical fiber for connecting the time sequence controllers into a tree network, and further comprises a trigger input, a clock input and a sudden-stop input; all outputs of each time sequence controller can be used for providing clock or trigger for other equipments or connected with clock or trigger inputs of other time sequence controllers; by only using the time sequence trigger function, the trigger output of one node can be connected with the trigger input of another anode without connecting a clock signal when the accurate time synchronization is unnecessary. The distributed system structure is realized by adopting the tree network and the optical fiber, the influence of electromagnetic interference is reduced, and the wiring difficulty is reduced; the system can be used for providing time sequence trigger and clock signals with high precision for a large physical experiment device.

The invention provides a recording electrode with an S-shaped metal shielding structure and a preparation technology. The recording electrode is provided with an S-shaped metal shielding layer, and the S-shaped metal shielding layer is located between an electromagnetic interference source and a metal electrode layer and used for attenuating electromagnetic interference. The recording electrode further comprises an S-shaped polymer substrate layer, an S-shaped polymer intermediate insulating layer, an S-shaped metal electrode layer and an S-shaped polymer packaging layer, each structural layer adopts an S-shaped bending structure, and the integrated flexible photoelectric electrode has stretchability, can collect neutral signals normally in a certain deformation range and meets the actual application demands. The invention further provides a preparation technology of the recording electrode with the S-shaped metal shielding structure. The prepared recording electrode not only can effectively reduce influence of the electromagnetic interference on neural signal collection quality, but also can deform with electrode structure stretching and can be applied to animal tissue with deformation.

The invention provides a multidirectional rotating platform, comprising a base, a first platform which is installed on the base and can rotate along a first axis relative to the base and a second platform which is installed on the first platform and can rotate along a second axis relative to the first platform. The rotating platform is characterized in that the rotating platform also comprises two piezo motors which are installed on the first platform, wherein one piezo motor is used for driving the first platform and the second platform to rotate relative to the base, and the other piezo motor is used for driving the second platform to rotate relative to the first platform. The multidirectional rotating platform has simple structure, small volume and low cost and is less affected by electromagnetic interference. The invention also provides a multidirectional camera system applying the multidirectional rotating platform.

The invention relates to a transformer used for reducing electromagnetic interference influence and an applicable power switching circuit thereof. The transformer at least comprises a winding base, amagnetic core group partially penetrating the winding base, a first primary winding wound on the winding base and composed of a first winding part and a second winding part, a secondary winding woundon the first primary winding, and a first screening element arranged between the first primary winding and the secondary winding to be used for preventing the electromagnetic interference of the firstprimary winding from being conducted to the secondary winding, wherein the electromagnetic interference of the first winding part is larger than that of the second winding part; the first winding part of the first primary winding is arranged near the magnetic core group so as to screen the electromagnetic interference of the first winding part by the magnetic core group; the second winding part is wound on the first winding part and is adjacent to the secondary winding so as to increase the electromagnetic coupling efficiency of the first primary winding and the secondary winding. The invention can reduce the influence the electromagnetic interference to the transformer, thereby enabling the transformer to reduce leakage inductance, and therefore, the converting efficiency is improved.

The present invention discloses a super junction device. P-type columns of at least one super junction unit are internally provided with N-type electric field barrier layers, and the N-type electric field barrier layers are configured to segment the P-type columns into first and second P-type columns which are respectively located at the top portions and the bottom portions of the electric field barrier layers; the N-type electric field barrier layers are configured to realize segmentation exhaustion of super junction structures at a top portion and a bottom portion; when a source-drain voltage of a super junction device is smaller than or equal to a first voltage value, the super junction structure at the top portion is only exhausted; and when the source-drain voltage of the super junction device is larger than the first voltage value, the super junction structures at the top portion and the bottom portion are exhausted. The present invention further discloses a manufacturing methodof a super junction device. According to the invention, a gate-drain capacitance and the minimum value of the gate-drain capacitance can be improved to effectively reduce the electromagnetic interference performance of the device in an application circuit and effectively reduce current and voltage overshoot caused by the device in the application circuit, reversely recovered soft factors of the device can be increased, and a breakdown voltage of the device can be maintained.

The invention discloses a trench-gate superjunction device. A P-type post is divided to an electrode connection P-type post and a floating P-type post which form a first periodic arrangement structurewith a step larger than that of a superjunction unit, a P-type well and a contact hole are formed in the top of the electrode P-type post, the P-type well extends to an N-type post, the contact holeis connected with a source, the P-type well and the contact hole are not formed in the top of the floating P-type post, a length direction of a trench gate and a length direction of the superjunctionstructure are perpendicular to each other and are arranged to form a second periodic arrangement structure, and the step of the second periodic arrangement structure is independently adjusted. The invention also discloses a manufacturing method of the trench-gate superjunction device. By the trench-gate superjunction device, the breakdown voltage and the channel density of the device can be improved, the conduction resistance is reduced, higher Crss can be obtained under very low Vds, the Crss can be slowly reduced within a relatively large Vds range, the speed of the switch process can be reduced, the electromagnetic interference performance of the device in an application circuit can be effectively reduced, and overshoot of a current and a voltage brought by the device in the applicationcircuit can be effectively reduced.

The present invention discloses a plasma series compensation gap system which is used for protecting a series compensation capacitor connected in series to a high-voltage power transmission line and metal oxide varistors connected in parallel to both ends of the series compensation capacitor. A plasma gap apparatus comprises a gap connected in parallel to the series compensation capacitor and a plasma generator for triggering a gap action; and a gap trigger apparatus is used for receiving energy which is externally supplied and outputting a pulse voltage to the plasma generator so as to trigger the gap action. The gap action is triggered by the plasma generator, so that setting of a wide gap can be realized and false triggering of the gap is effectively reduced; and multiple ignition loops are adopted, so that reliability of gap triggering can be reinforced. A laser energy supply mode is adopted, so that influence of electromagnetic shielding is reduced.

The invention relates to a touch panel device (1) comprising a touch input surface (3), at least one sensor (7,11) that serves to monitor a contact and/or a load applied to the touch input surface (3), a tactile response generation unit (9) that is rigidly connected to the touch input surface (3), and a control unit (5) that serves to process a signal from the sensor (7,11) and control the tactileresponse generation unit (9) on the basis of the monitored contact and/or load, wherein the tactile response generation unit (9) comprises a housing (91 ), said housing comprising magnetically conducting material, an electrically conducting coil (93) arranged fixedly within the housing (91 ), and a core (95) comprising magnetically conducting material, wherein the core (95) is arranged within thecoil (93), such that the core (95) is movable along a long axis (Z) of the coil (93).

The invention discloses a photoelectric conversion device for IGBT (Insulated Gate Bipolar Translator) driving signal transmission, which comprises a power supply filter circuit, a voltage conversioncircuit, a pulse signal conversion circuit and a fault signal conversion circuit; the power supply filter circuit is respectively connected with the power supply ends of the voltage conversion circuit, the pulse signal conversion circuit and the fault signal conversion circuit; the voltage conversion circuit reduces the voltage and then is connected with the low-voltage power supply end of the pulse signal conversion circuit, and the pulse signal conversion circuit inverts and shapes an optical pulse signal emitted by the controller and then sends the optical pulse signal to the drive circuitof the IGBT. According to the invention, the problem that in the transmission process, an interference source interferes with a pulse signal through a parasitic capacitor and a parasitic inductor of atransmission line and may cause mis-conduction of an IGBT (Insulated Gate Bipolar Transistor) to cause short circuit and damage a device due to the fact that the current driving pulse signal is transmitted by adopting the transmission line is solved.

The invention discloses a satellite-borne dual-band four-channel rotary joint which comprises a first single-waveguide rotor, a first dual-waveguide stator, a dual-waveguide rotor, a second dual-waveguide stator and a second single-waveguide rotor. The first single-waveguide rotor, the double-waveguide rotor and the second single-waveguide rotor are rotors, and the first double-waveguide stator and the second double-waveguide stator are stators; the first double-waveguide stator is arranged between the first single-waveguide rotor and the double-waveguide rotor and is supported and connected through a bearing, the second double-waveguide stator is arranged between the second single-waveguide rotor and the double-waveguide rotor and is supported and connected through a bearing, and the rotors and the stators can rotate relatively. The dual-band four-channel rotary joint is a Ka-high-band four-channel rotary joint and a K-high-band four-channel rotary joint and has the advantages of being high in working frequency and large in number of channels, the channels are independent of one another due to the concentric stacking structure, and the requirement for high isolation between the channels is met.

An optical scanning module is configured in a scanning device for picking up images of files including: an optical sensing component, a front processor and a special used IC, in which, the optical sensing component senses the optical signals of related files and converts the optical signals to analog image signals, a front processor is coupled with an optical sensing component and receives analog image signals and transforms them to digital image signals, the special application IC is used in receiving and processing digntal image signals and outputs them.