Figure 5 shows the continuous voltage curve obtained by adding a filter capacitor to the Figure 1 circuit.The section b-c is a straight line. During this time it is the filter capacitor that supplies the load current.The slope of this line increases as the current increases, bringing point c lower.Consequently the diode conduction time (c-d) increases, increasing ripple.With zero load current the DC output voltage is equal to the peak value of the rectified AC voltage.Figure 6 shows how to obtain positive and negative outputs referred to a common ground.Useful design data for this circuit is given in figures 7, 8 and 9. In particular, the curves shown in Figure 7 are helpful in determining the voltage ripple for a given load current and filter capacitor value. The value of the voltage ripple obtained is directly proportional to the load current and inversely proportional to the filter capacitor value.
Posted on: Fri, 07 Jun 2013 18:24:50 +0000
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