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Hello everyone, I’m Gong Leng Hui. Recently, some friends have sent me private messages asking about the functions of filters, their working principles, ways to troubleshoot problems, and their market prices. Below is the information compiled by Gong Leng Hui. If you have any questions, don’t forget to send a private message to Gong Leng Hui! I. Filter composition: A filter is a filtering circuit composed of capacitors, inductors, and resistors. Filters can effectively remove frequencies at specific points in the power line, or frequencies other than those points, thereby producing a power signal of a specific frequency or eliminating a power signal at a specific frequency. II. Function of the filter: The role of the filtering circuit is to minimize the AC component of the pulsating DC voltage while retaining its DC component, thereby reducing the ripple factor of the output voltage. Below is a schematic diagram of the filtering process. III. Principle of operation of the filter: When there is a change in current through the filter inductor, the inductive coil uses the induced electromotive force to prevent such changes in current. When the current flowing through the inductor increases, the self-induced electromotive force generated by the inductor acts in the opposite direction to the current flow; this prevents the current from increasing further, while storing some of the electrical energy within the inductor. When the current flowing through the inductor in the filter decreases, the self-induced electromotive force, which flows in the same direction as the current, prevents the current from decreasing further. At the same time, it releases the stored energy to compensate for this decrease in current. Therefore, after inductive filtering, not only are the fluctuations in load current and voltage reduced, but the waveform also becomes smoother. IV. The role of filters in screw compressors such as York: 1. Separating useful signals from noise, thereby improving the signal’s resistance to interference and enhancing the signal-to-noise ratio. 2. Filter out unnecessary frequency components to improve analysis accuracy. 3. Isolate a single frequency component from complex frequency components. V. Common filter faults: 1. The filter fuse burns out. The cause of the failure was that the supply voltage exceeded the rated voltage of the filter inductor. 2. Open circuit of the filter and reduced capacitance. The causes of failures are usually poor contact, substandard product manufacturing processes, or loose or broken internal leads. VI. Applications of Filters in the Market There are a wide variety of filter types, each with distinct performance characteristics; therefore, filters are used in industries such as telecommunications, semiconductors, petrochemicals, chemical fibers, steel/medium-frequency heating, the automotive industry, automated production lines and precision equipment (including refrigeration compressors), hospital systems, voice processing, television, radar, mobile phones, and more. VII. Market prices of filters: There are a wide variety of filter types, and they are used in different applications. Therefore, Gonglenghui provides an example using the price of the 333Q0001418 model of filter used in the industrial refrigeration compressor industry; currently, its price ranges from 300 to 1000 yuan. The price of filters for use in automobiles is below 100 yuan. If necessary, search for Gonglenghui on Baidu: www.irmro.cn.