3results about How to "Immune to electromagnetic interference" patented technology

The application discloses a FBG type wearable fingertip three-dimensional force sensor for traditional Chinese medicine and a three-dimensional force measuring method, and the sensor comprises a fingertip, an elastic body, a fixed finger sleeve and a plurality of optical fibers; the fingertip is a force collector of the FBG type wearable fingertip three-dimensional force sensor for traditional Chinese medicine; the first end of the elastic body is connected with the fingertip, receives the force transmitted by the fingertip and generates deformation; the second end of the elastic body is connected with the fixed finger sleeve and is used for wearing on a finger; the plurality of optical fibers are uniformly arranged on the elastic body and generate deformation in X, Y and Z directions under the deformation of the elastic body, so that the three-dimensional force of the fingertip is obtained. The sensor adopts the FBG, no current passes through the optical fiber, and no electrical connection is needed; the force sensing system is not disturbed by electric noise and electromagnetic interference; the sensing element has small size and light weight, high precision, zero drift, wide frequency response and good high-temperature performance.

The application relates to a signal transmission method between a fire telephone main machine and a fire telephone extension and a fire telephone system, wherein a near-end optical transmission device is connected with the fire telephone main machine, a far-end optical transmission device is connected with the fire telephone extension, the near-end optical transmission device is connected with the far-end optical transmission device through an optical fiber; an electric signal of analog audio data on a first fire telephone bus is converted into an optical signal by the near-end optical transmission device, and the converted optical signal is transmitted through the optical fiber; the signal transmission method between the fire telephone main machine and the fire telephone extension and the fire telephone are ingeniously designed; the converted optical signal is transmitted through the optical fiber; the optical fiber has the advantages of low loss, high bandwidth, strong anti-electromagnetic interference capability and the like; the transmission distance of general optical signals can reach at least 20 kilometers; during the transmission process, the optical fiber is not conductive, is not interfered by electromagnetic waves, is less affected by resistance and voltage, and the stable transmission of signals in a complex electromagnetic environment is ensured.

This utility model discloses a drone countermeasure terminal and charging control circuit, including a charging management chip, a filtering circuit, and an interlocking circuit. The filtering circuit is disposed at the input terminal of the charging management chip and includes a common-mode inductor, a first filtering capacitor, and a second filtering capacitor. The common-mode inductor is connected in series with the input terminal of the charging management chip, and the first filtering capacitor is connected in parallel with the input and output terminals of the common-mode inductor. The interlocking circuit is connected to the input terminal of the charging management chip and is used to disconnect the input power supply of the charging management chip when the countermeasure unit is activated. Therefore, the interlocking circuit can automatically cut off battery charging when performing drone countermeasures, thereby protecting battery safety. Furthermore, the filtering circuit can effectively filter electromagnetic interference, further ensuring that the battery charging input is not affected by electromagnetic interference generated during countermeasures.