42results about How to "Solving Electromagnetic Compatibility Issues" patented technology

The invention relates to a battery monomer voltage measuring circuit and a compensation method for measuring error thereof, and belongs to the technical field of power of electromobiles. The circuit comprises a high voltage gating circuit, a high common-mode measuring circuit, an isolation amplifying circuit, an absolute value circuit, a singlechip digital core circuit, a communication circuit and a power circuit. The compensation method for measuring error comprises the following steps: analyzing the measuring error, and obtaining a modifier formula for the monomer voltage measurement. Aiming at the characteristics of a great number of voltage monomers, gradual accumulated potential and high absolute potential in the battery, the high-voltage part and the lower-voltage part are separately arranged, thereby solving the problems of electromagnetic compatibility and high-voltage insulation in the high-density multichannel monomer voltage measurement. The monomer voltage measuring circuit has the advantages of high precision, high reliability, small size and low measurement cost per monomer. The error correction method can be used for acquiring high-precision battery voltage measurement results (the error is less than 10 mV), and is applicable to monomer voltage on-line precision measurement of power batteries for electromobiles.

The invention belongs to the technical field of electronic control of engines and in particular relates to an isolation type power driving circuit which comprises power driving with photoelectric isolation, failure feedback with photoelectric isolation, an isolation driving and protective circuit and an isolation failure diagnosis circuit. An output protective signal drives a relay through a photoelectric apparatus 1 to supply power to an electromagnet and cuts off the power supply for the electromagnet when failure occurs; a power driving signal drives an MOS tube through a photoelectric apparatus 2 and a current-limiting resistor 1 and provides different average driving current for the electromagnet through controlling the connection and the disconnection of the MOS tube; high-level and low-level signals at the upper end of the MOS tube drive a photoelectric apparatus 3 through the feedback of a current-limiting resistor 2; a signal after the photoelectric apparatus 3 and a power driving signal form a failure distinguish logic through a J trigger and a K trigger to output a low-level signal or a high-level signal. The invention has simple structure and reliable function and effectively solves the difficult problems of electromagnetic compatibility and isolation high-power driving of an engine electric control system.

The invention discloses an assembled single-phase reactor. A shell of a magnetic pot is formed by assembling two semicircular base plates positioned at two ends and a plurality of magnetic ring housings positioned between the two semicircular base plates; the shell of the magnetic pot and magnetic columns which are positioned in the magnetic ring housings and magnetically communicated with the two semicircular base plates together form an assembled magnetic pot; the magnetic columns are a plurality of series assembly structures; the shell of the magnetic pot and the magnetic columns are fixed with each other through passed bolts; one or two gaps for leading out wires is or are formed in the plurality of magnetic ring housings; foil winding coils are wound outside the magnetic columns; and a filling material is filled in a space in the pot body. By the assembled single-phase reactor, the technical problems that the conventional single-phase reactor product made of soft magnetic powder metallurgy materials and foil winding coils is low in electromagnetic compatibility and high in magnetic flux leakage, cannot change the capacity and the technical characteristic of the product conveniently, and the like can be solved.

The invention relates to a satellite-borne tripe-frequency beacon and a working method thereof. The satellite-borne tripe-frequency beacon comprises an emitter, an emission antenna and a radio-frequency connection cable, wherein the radio-frequency connection cable is arranged between the emitter and the emission antenna, the emitter comprises a constant temperature crystal oscillator and a frequency source unit, the frequency source unit is electrically connected with the constant temperature crystal oscillator, coherent signals, generated by the frequency source unit, at VHF, UHF and L bandsare orthogonalized by a bridge and then synthesized and amplified by a power amplifier to output an I/Q signal, a lower computer management circuit for controlling each part in the emitter to work communicates with a satellite service through a CAN bus, and a power unit supplies power to each part in the emitter. With the satellite-borne tripe-frequency beacon disclosed by the invention, three coherent signals at the VHF, UHF and L bands can be initially and simultaneously emitted, the problem of electromagnetic compatibility of the tripe-frequency beacon and a GNSS occultation receiver is solved, the problem of in-band interference of the GNSS occultation receiver is effectively solved, normal working of the beacon is ensured, and meanwhile, normal working of the GNSS occultation receiver is not affected.

The invention relates to an electromagnetic compatibility analysis method of a radio-frequency module backboard. A prediction equation is established to determine an electromagnetic interference between an interference port and a sensitive port of the backboard, a source function and a transmission function are combined together, effective power at the sensitive port of the backboard is obtained, and then the obtained effective power is compared with a sensitivity threshold so that whether a latent electromagnetic interference exists is determined; if the effective power generated by the interference port at the sensitive port is less than the sensitivity threshold of a device, an electromagnetic compatibility state exists, otherwise, an interference problem exists; and a cross-correlation matrix is built through design for an S parameter between the various ports in a simulation backboard then, cross correlation, i.e., the relationship coupling degree, between the ports of the backboard is analyzed, interference conditions of various modules on the backboard at different working frequencies are determined, and then convenience is provided for subsequent targeted electromagnetic compatibility design. The electromagnetic compatibility analysis method is targeted; and electromagnetic compatibility analysis method is advantageous in that a design period is shortened, electromagnetic compatibility design efficiency is improved, and time cost is greatly saved.

The invention relates to a device for detecting intervertebral disc pressure, comprising a plurality of resistance strain gauges (1) which are stuck to the detected position of the surface of intervertebral disc and used for detecting signals and a stress detection transmitter (2) which is electrically connected with the resistance strain gauges (1), wherein the stress detection transmitter (2) comprises inner bridge units, operation amplifier units, analog-to-digital conversion units and wireless transmission modules which are successively electrically connected; the inner bridge units and the corresponding resistance strange gauges (1) constitute bridges; the resistance strain gauges (1), the inner bridge units, the operation amplifiers and the analog-to-digital conversion units have the same number and correspond with one another. The device further comprises an upper computer which is in wireless communication with the stress detection transmitter (2). The device can realize trauma-free direct nondestructive test or measurement of pressure of intervertebral disc.

The invention relates to a vehicle-mounted multi-frequency integrated antenna device. The vehicle-mounted multi-frequency integrated antenna device comprises a 350MHz cluster mobile antenna, an 800MHz cluster mobile antenna, a 3G public mobile communication antenna, an FM antenna, a compass double-mode antenna, a GPS double-mode antenna, a 3G wide-band antenna support, a bottom board, an outer shell, a feeder line and a short circuit. The vehicle-mounted multi-frequency integrated antenna device has the advantages that the electric sizes of the 350MHz cluster mobile antenna and the 800MHz cluster mobile antenna are small, the antenna device combines the advantages of an IFA antenna structure, a reversed-F-shaped short circuit structure is connected into the receiving end of the antenna device so as to change the currents of the antenna device, and the size is reduced. The 350MHz cluster mobile antenna and the 800MHz cluster mobile antenna are of a double-frequency structure, the top of the antenna is modified to be of a slow wave structure by modifying a spiral antenna, the resonance currents change for the second time, and the characteristic of double-frequency operation is achieved.

The invention relates to a research method of novel high-efficient power supply equipment for special needs for a low-voltage distribution system. The research method comprises theoretical analysis and experiment research. Compared with the prior art, the invention has the functional characteristics of high power supply reliability, good power quality of power supply and meeting of a plurality of users and demands and has the advantages of inhibiting harmonic pollution of a power system and resonance of power system parallel compensation equipment, and the like.

The invention discloses a ruggedized redundant array of independent disks (RAID) and belongs to the technical field of RAID. An RAID controller, a redundancy power supply and a hard-disk pack are arranged inside a chassis, wherein, the RAID controller is connected with an interface board and controls a plurality of hard disks which are connected; a backplate is arranged in the chassis, socket connectors are arranged on the baseplate, and the RAID controller is oppositely connected with the socket connectors on the baseplate through the socket connectors; the overall shock absorption of the hard disk is performed by means of hard disk silica shock absorption, and the hard disk is oppositely inserted with the socket connectors on the baseplate through socket connectors, socket connectors are connected with the baseplate through adopting a flexible printing circuit board (PCB); the redundancy power supply is fixed through adopting a locking device and connected with a pinboard of the power supply, and the pinboard of the power supply and the baseplate are connected through the flexible PCB; and a temperature-control plate is arranged in the chassis and matched with the pinboard of the power supply. The ruggedized RAID solves the deficiencies in the storage device of the RAID, and has the advantages of anti-vibrating and impact, electromagnetic compatibility, and moisture proofing, mould proofing, salt spraying proofing and the like.