This article mainly introduces the classification and series of single-phase power filters. I hope this article can give you a deeper understanding of single-phase power filters. The power filter is an electrical equipment that effectively filters out the frequency point of a specific frequency in the power line or the frequency other than the frequency point. The function of the power filter is to obtain a power signal of a specific frequency by connecting the power filter to the power line, or to eliminate the power signal of a specific frequency. Using this characteristic of the power supply filter, a square wave group or compound noise after passing the power supply filter can be turned into a sine wave of a specific frequency. High-power power filters such as Satons, UBS, inverters, etc. will generate a large amount of harmonic currents. This type of filter requires active power filter APF. APF can filter out the 2~50th harmonic current. The power filter is a passive two-way network, one end of which is the power source, and the other end is the load. The principle of the power filter is one kind-impedance adaptation network: the greater the impedance adaptation between the input and output sides of the power filter and the power and load sides, the more effective the attenuation of electromagnetic interference. The AC single-phase power filter has excellent common mode and differential mode filtering effects, and is suitable for switching power supplies, embroidery machines, currency counters, engraving machines, controllers, industrial computers, scientific analysis instruments and other power electronic equipment and frequency conversion equipment; Cost-effective, a variety of connection methods are available, which can effectively suppress electromagnetic interference between line-to-line and line-to-ground; reduce the product's harassment voltage emission to the power grid, provide product immunity, and block dirty power from the power grid to the equipment Impact. AC single-phase power filter high-performance filter, with higher common mode, differential mode filtering effect and better low frequency filtering effect, the effective filtering range is 10KHz~30MHz; Wei Aipu VIP4-3A series adopts first-level differential mode and two The three-stage filter design composed of three-stage common mode is especially suitable for equipment or environments with particularly harsh interference conditions; it is widely used in electrical and electronic equipment, data communication equipment, single-phase servo motors, inverters, PLCs, variable frequency power supplies, electric vehicles, and charging Equipment or environments with particularly harsh interference conditions such as piles. AC single-phase power filter Ordinary AC filter with good filtering effect, the effective filtering range is 150KHz~30MHz; compact structure, high cost performance, safe and convenient, more reliable; Wei Aipu VIP4-1A and VIP4-1B series Using a first-level common-mode filter circuit design, the filtering effects of the two are basically the same, and there are only slight differences depending on the current. Widely used in electrical and electronic equipment, consumer electronics, household appliances, medical equipment, data communication equipment, office automation equipment. Single-phase power filter series Single section general type: ME200, ME210, ME220 series Double section general type: ME410, ME422, ME430 series Double section enhanced type: ME610 series Three-section high-performance type: ME710 series The purpose of selecting a power filter is to suppress electromagnetic noise. The function is to obtain a power signal of a specific frequency by connecting a power filter to the power line, or to eliminate a power signal of a specific frequency. When using it, we need to understand the knowledge of the power supply filter, so as to prevent unnecessary losses, and when using it, we also need to know how to choose the power supply filter. Tools/Materials Power filter Select rated voltage 1 The rated voltage is the working voltage of the power supply EMI filter when the power supply frequency is specified, and it is also the highest allowable voltage value of the filter. If used in a 50Hz single-phase power filter, the rated voltage is 250V; 2 The filter used in the 50Hz three-phase power supply has a rated voltage of 440V. If the input filter voltage is too high, the internal capacitor will be damaged. 2. Rated current 1 Rated current (Ir) is the maximum continuous operating current allowed under the conditions of rated voltage and specified ambient temperature. As the ambient temperature rises, or due to the copper loss of the inductor wire, the core loss, and the ambient temperature, the operating temperature is higher than room temperature. At this time, it is difficult to ensure the performance of the insertion loss. We should choose the rated current of the filter according to the actual possible maximum working current and working environment temperature. 3. Insertion loss 1 Definition of Insertion Loss Insertion loss is one of the most important technical parameters of EMI power filters. The central issue considered by designers and engineering application personnel is: on the premise that the safety, environment, machinery and reliability of the filter can meet the requirements of relevant standards , To achieve the highest possible insertion loss. The insertion loss of the filter is a function of frequency, expressed in dB (decibel). When the circuit is not connected to the filter, the signal source at the receiving circuit end voltage (power) is U (P), after the filter is connected, the input voltage (power) at the receiving end is U (P), and the insertion power consumption IL (InsertionLoss) is defined It can be deduced by the following equation: Assuming that the actual load impedance remains unchanged before and after the filter is inserted, the power of formula 1.1 can be replaced by its corresponding load voltage and impedance expression: The insertion loss expressed in the equation requires Take measurements at any frequency by removing and inserting filters. 2 Common mode loss and differential mode loss The insertion loss of an EMI power filter includes common mode (denoted as CM) insertion loss and differential mode (denoted as DM) insertion loss. Regarding their specific test methods, they have been explained in CISPR Publication No. 17, so I won't explain them here. Choice of exterior size Also pay attention to the external dimensions and installation hole distance before selection. This can prevent the purchased filter from being unable to be installed. 2 The choice of connection method, the filter basically has a lead connection, a copper screw connection (be careful not to buy iron), a PCB pin filter, an IEC socket filter, and a solder connection copper bar connection This is the end of the introduction to the classification of single-phase power filters. M5 Circular Connectors,M5 Waterproof Circular Connector,M5 Waterproof 4P Male Connector,M5 Male Head Waterproof Connector Shenzhen HuaTao Electronic Co., LTD , https://www.htconnector.com
