Dc Power Filter Ac Separation Dc Purification Control Called Power Supply Board Power Dc Component Filter Power Supply Module

The DC isolation board can suppress the transformer noise caused by DC in the 220V power grid, but it does not work for poor quality transformers that make noise even with pure AC. Please observe the transformer carefully. If it makes a loud noise sometimes and is very quiet sometimes, it means that there may be DC components in the power grid. AC with DC components in the power grid will cause the transformer to make annoying noise, especially the ring transformer. In the city power grid, the AC waveform is originally. The upper half wave and the lower half wave are symmetrical, but because thousands of households share the same power grid, various different electrical appliances are used in parallel (such as electric heaters, hair dryers, etc. - the low power gear of some electrical appliances is usually adjusted by simple series diodes), which will cause the upper half wave or the lower half wave of the AC to have an unbalanced voltage drop and produce a certain DC component. For high-power transformers, the primary resistance is very low, generally only a few tenths to a few ohms of resistance, especially the ring transformer core is a whole strip of steel sheet without magnetic spacing, a very low voltage can reach the magnetic saturation of the core, (such as in the power grid With a 2V DC voltage, the primary resistance of a 500W toroidal transformer is less than 2 ohms. Current = voltage divided by resistance. Just because this 2V DC voltage can make the primary current of the transformer reach 1A), this will not only increase its own power consumption and temperature rise, but also increase working noise, and even cause abnormal magnetic saturation of the transformer core. This product is connected in series in the AC220V live wire. It uses a 25A high-current rectifier bridge. Six-stage series connection eliminates the DC component more thoroughly.