| Bridge Rectifier |
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| CATEGORIES ABOUT DIODE BRIDGE | |
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The essential feature of this arrangement is that for both polarities of the Voltage at the bridge input, the polarity of the output is constant. FULL WAVE RECTIFICATION When the input connected at the left corner of the diamond is positive with respect to the one connected at the right hand corner, Current flows to the right along the upper colored path to the output, and returns to the input supply via the lower one. When the right hand corner is positive relative to the left hand corner, current flows along the upper colored path and returns to the supply via the lower colored path. In each case, the upper right output remains positive with respect to the lower right one. Since this is true whether the input is AC or DC, this circuit not only produces DC power when supplied with AC power: it also can provide what is sometimes called "reverse polarity protection". That is, it permits normal functioning when Batteries are installed backwards or DC input-power supply wiring "has its wires crossed" (and protects the circuitry it powers against damage that might occur without this circuit in place). Prior to availability of integrated electronics, such a bridge rectifier was always constructed from discrete components. Since about 1950, a single four-terminal component containing the four diodes connected in the bridge configuration became a standard commercial component and is now available with various voltage and current ratings. |
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