PARTS AND MATERIALS
Lessons In Electric Circuits, Volume 3, chapter 3: “Diodes and Rectifiers”
This circuit provides full-wave rectification without the necessity of a center-tapped transformer. In applications where a center-tapped, or split-phase, source is unavailable, this is the only practical method of full-wave rectification. In addition to requiring more diodes than the center-tap circuit, the full-wave bridge suffers a slight performance disadvantage as well: the additional voltage drop caused by current having to go through two diodes in each half-cycle rather than through only one.
With a low-voltage source such as the one you’re using (6 volts RMS), this disadvantage is easily measured. Compare the DC voltage reading across the motor terminals with the reading obtained from the last experiment, given the same AC power supply and the same motor.
Schematic with SPICE node numbers:
Netlist (make a text file containing the following text, verbatim):
Fullwave bridge rectifier v1 1 0 sin(0 8.485 60 0 0) rload 2 3 10k d1 3 1 mod1 d2 1 2 mod1 d3 3 0 mod1 d4 0 2 mod1 .model mod1 d .tran .5m 25m .plot tran v(1,0) v(2,3) .end
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by Robert Keim
In Partnership with Dove Electronics