5results about How to "Avoid harmonic interference" patented technology

The invention provides a multi-channel signal transformer bank. The multi-channel signal transformer bank comprises an insulating bottom plate and a plurality of transformers, the plurality of transformers are arranged on the insulating bottom plate; the transformer comprises a magnetic core, a primary coil and a secondary coil, wherein the primary coil and the secondary coil are wound on the magnetic core. A plurality of primary leading-out ends are led out from the primary coil through a center tap, and a plurality of secondary leading-out ends are led out from the secondary coil through a plurality of windings. According to the transformer bank, the plurality of transformers are arranged on the same insulating bottom plate, the structure is compact, the integration degree is high, the size of the whole transformer bank is reduced, and the signal processing efficiency is greatly improved. The primary coil adopts a center tapped mode, so that the effects of adjusting output voltage, preventing harmonic interference, providing a stable voltage source, reducing common-mode current / voltage and providing direct-current bias for Rx / Tx signals in the transformer can be effectively achieved; and the secondary coil adopts a multi-path winding so as to meet various converted voltage values in use, and the transmission efficiency of the transformer bank is improved.

The invention discloses a power supply circuit, a power supply method and a power supply system of a refrigerator car, and relates to the field of power supplies. If alternating current output by an alternating current power supply is received, direct current obtained by rectifying the alternating current through a rectifying circuit is used for supplying power to target equipment; and when no alternating current output by the alternating current power supply exists, the original power supply of the target equipment is used for supplying power. Meanwhile, the alternating current power supply is input into the rectifying circuit after passing through the reactor, so that harmonic interference in a power grid can be effectively avoided, stable operation of target equipment is facilitated, and the utilization rate of electric energy is improved; the original power supply serves as the main power supply, the alternating current output by the alternating current power supply serves as the standby power supply, automatic switching of the main power mode and the standby power mode is achieved, and the new energy refrigerator car can directly use the mains supply to supply power to the refrigerating unit under the condition that the mains supply is connected. The situation that the original power supply of the new energy refrigerator car needs to supply power to the refrigerating unit while being charged is avoided, and the charging rate of the original power supply in the new energy refrigerator car is increased.

The invention provides an MIMO (multiple input multiple output) array high-resolution beam forming method based on single-bit transmission, relates to the technical field of array signal processing, and aims at narrow-band LFM (linear frequency modulation) waveforms of random phases to model single-bit array signals of the narrow-band LFM waveforms. By considering the multi-channel time delay characteristic, the quantized high-order frequency domain characteristic and the high-order spatial frequency characteristic, a unified space-time frequency domain model is constructed to analyze the harmonic mechanism and the spatial dispersion effect, and the single-bit quantization theory is perfected. And then, on the basis of a traditional SIMO mode, further considering that single-bit quantization is adopted for a transmitting end of the array so as to obtain a decorrelated array transmitting signal, and adopting high-precision quantization and matched filtering at each channel of a receiving end, so that the design of the MIMO array signal processing framework based on single-bit transmission is completed. According to the invention, low-power-consumption and high-precision digital beam forming is realized through single-bit quantization and emission processing of MIMO array signals.

The present invention relates to the field of vibration measurement technology, and in particular to a single-end side-excitation cylindrical electromagnetic drive device with integrated driving and guiding, comprising an electromagnetic drive component and a moving component; the electromagnetic drive component comprises a lower magnetic yoke, a permanent magnet in an annular shape arranged on the upper side of the lower magnetic yoke, and an upper magnetic yoke in an annular shape arranged on the upper side of the permanent magnet; a moving cavity is formed inside the lower magnetic yoke, the permanent magnet and the upper magnetic yoke; a central magnetic yoke is installed on the lower magnetic yoke and inside the moving cavity; an air gap is arranged between the central magnetic yoke and the upper magnetic yoke; the moving component comprises a work surface located on the upper side of the central magnetic yoke, a coil frame is arranged on a side of the work surface close to the central magnetic yoke, and the coil frame is slidably sleeved on the outer side of the central magnetic yoke; a DC coil and an excitation coil are wound around the outer wall of the coil frame. By adopting the above scheme, the difficulty of assembling the moving component is reduced to the greatest extent, and the deadweight of the moving component is reduced, and the assembly accuracy and driving ability of the electromagnetic drive device are effectively improved.

This application discloses a control method and related apparatus for a charging and discharging system, relating to the technical field of new energy vehicles. The charging and discharging system includes a charging pile circuit and an on-board charger. The charging pile circuit is used to connect to an external power grid, and the on-board charger is used to connect to a battery. The control method includes: when the on-board charger and the charging pile circuit are electrically connected, determining a target operating mode; if the current mode is determined to be AC ​​charging, controlling the charging pile circuit to draw power from the external power grid and transmit AC power to the on-board charger, so that the on-board charger converts the received AC power into DC power according to a drive signal and outputs it to the battery; if the current mode is determined to be DC discharging, controlling the on-board charger to be in a direct-on state, so that the DC power output from the battery is output to the charging pile circuit via the on-board charger, and then controlling the charging pile circuit to transmit the received DC power to the external power grid. This application can reduce the discharge load on the power grid during peak electricity consumption periods.