1. Suppress dažādi elektromagnētiskie interference avoti in switching power plugs
In order to solve the distortion of the input current waveform and reduce the current harmonic content, the switching power supply needs to adopt power factor correction (PFC) technology. PFC technology makes the current waveform follow the voltage waveform, and corrects the current waveform to make it close to a sine wave. Tāpēc, the current harmonic content is reduced, the input characteristics of the bridge taisngriezis kondensators filtrs ķēde are uzlabot, and the power factor of the switching power supply is improved. Different methods can suppress electromagnetic interference from different angles, and Minrong Electric has made lot of technical investment and investigationsteking efforts for this. Minrong switching power supply has achieve great results in elektromagnētiskais interference slāpēšana. The contribution of Minrong Electric has created the position of Minrong switching power supply in the industry.
Soft komutācija tehnoloģija is an svarīgi līdzekļi to samazināt samazināt zudums komutācija ierīces un uzlabot the elektromagnētiskā saderība of komutācija ierīces. pārslēgšana ierīces būs ģenerēt ieplūst strāva un maksimums spriegums laikā pārslēgšana process, kas ir galvenais cēlonis of elektromagnētiskais interference un komutācija zudums. Izmantojot soft switching technology to make the switching tube switch and zero current can effective slāpēt elektromagnētiskais interference. Lietošana a snubber circuit to absorbcija maksimums spriegums at abi gali of the switching caurule or the primārais spole of a augstfrekvence transformators var arī efektīvi uzlabot the elektromagnētiskais saderība īpašības.
2. Nogrieznis izslēgšana pārraide ceļš o elektromagnētiskais interference - dizains of parastais režīms un diferenciālais režīms barošana līnija filtri
The power line filter can filter out power line interference. A reasonable and effective switching power supply EMI filter must have a strong suppression effect on differential mode interference and common mode interference. In fact, it is not limited to power line filters. Minrong Electric ir also developed means to suppress electromagnetic interference on some specific components. User experience is one of the directions that Minrong Elektriskais uzstāj uz. Tehnika attīstība of Minrong Electric is neatdalāms from Minrong Electric's sticking to the direction, kas arī padara Minrong switching power supply pakāpeniski sasniedz kvalitāte of ingenuity.
The common mode inductor consists of two windings with opposite winding directions and the same number of turns on the same magnetic ring. Generally, a toroidal core is used, which has small magnetic flux leakage and high efficiency, but it is difficult to wind. When the power frequency current of the city network flows through the two windings, one goes in and the other goes out, and the generated magnetic field just cancels out, so that the common mode inductance will not hinder the power frequency current of the city network, and can be transmitted without loss. If there is a common-mode noise current passing through the common-mode inductor in the city network, the direction of the common-mode noise current is the same. When it flows through the two windings, the generated magnetic field is superimposed on the same phase, so that the common mode inductance shows a large inductive reactance to the interference current, and plays a role in suppressing common mode interference.
3. Use shielding to reduce the sensitivity of electromagnetic sensitive equipment
Shielding is an effective way to suppress radiated noise. Materials with good conductivity can be used to shield electric fields, and materials with high magnetic permeability can be used to shield magnetic fields. In order to prevent the leakage field of the transformer and make the primary coupling good, a closed magnetic ring can be used to form a magnetic shield. For example, the leakage flux of a pot core is much smaller than that of an e-core. The connecting line and power line of the switching power supply should use shielded conductors to prevent external interference from coupling into the circuit. Or use EMC components such as magnetic beads and magnetic rings to filter out high-frequency interference from power and signal lines. But it should be noted that the signal frequency should not be interfered by EMC components, that is, the signal frequency should be within the filter. The shell of the entire switching power supply also needs to have good shielding properties, and the connectors should meet the shielding requirements stipulated by EMC. The above measures ensure that the switching power supply is not disturbed by the external electromagnetic environment and will not interfere with external electronic equipment.
