ABB UFC762AE101 3BHE006412R0101 module

Description

ABB UFC762AE101 3BHE006412R0101 module

ABB UFC762AE101 3BHE006412R0101 module

The communication switching power supply adopts active power factor correction. Although the control is complex, the effect is independent of the load, which improves the power factor and performance. At the same time, the switching power supply adopts soft switching technology to reduce circuit switching power consumption, reduce noise, and improve circuit efficiency and reliability. However, soft switching lossless absorption circuits often utilize L and C for energy transfer, utilizing the unidirectional conductivity of diodes to achieve unidirectional energy conversion. Therefore, the diodes in this resonant circuit become a major source of electromagnetic interference.
In communication switching power supplies, energy storage inductors and capacitors are generally used to form L and C filtering circuits to filter differential and common mode interference signals, and to convert AC square wave signals into smooth DC signals. Due to the distributed capacitance of the inductance coil, the self resonant frequency of the inductance coil is reduced, resulting in a large number of high-frequency interference signals passing through the inductance coil and propagating outward along the AC power line or DC output line. As the frequency of the interference signal increases, the capacitance and filtering effect of the filter capacitor continue to decrease due to the effect of the lead inductance, until it reaches the resonance frequency above, completely losing the function of the capacitor and becoming inductive. Improper use of filter capacitors and excessively long leads is also a cause of electromagnetic interference.

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