The circuit presented in here was chosen to limit the inrush current to a fairly safe value through the introduction of a small resistance in series with the power transformer’s primary winding. This small resistance is effectively shorted by a relay after a brief moment thereby connecting the power transformer’s primary winding directly to the mains.
This brief moment (often less than a second) is enough to charge up the filter capacitors to a level where their internal resistance has already increased, drawing less current to the whole power supply system.
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دايرة حماية على مدخل 220 فولت ac محتاج حد يشرحلنا طريقة عمل الدايرة
