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Switching power supplies are devices in which the input alternating voltage is rectified, after which it is converted into rectangular pulses. In this case, the output signal has a high frequency and a given duty cycle. The pulse train is applied to a transformer or output low-pass filter.
In such power supplies, small-sized transformers with a reduced core made of ferromagnetic materials are usually used.
The voltage of pulsed power supplies is stabilized by negative feedback, while the amplitude of voltage fluctuations at the input and the load do not interfere with the operation of the system.
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