Non-dissipative DC active filter and transformer

摘要

Non-dissipative filtering of a DC voltage, or current, is provided with an energy storage inductor coupled sequentially in alternate directions across the DC source. In another embodiment the inductor is part of the primary of a transformer and secondary DC voltage is derived by rectification. In a further embodiment, a thyristor and a diode respectively at opposite sides of the transformer and a capacitor at the output of the rectification unit concur in limiting the transferred DC energy to a selected level by control of the firing angle of the thyristor.