Tuesday 10 September 2013
Monday 2 September 2013
Design of DC power supply by diode capacitor bridge
This
diode capacitor bridge is widely used for power supplies intended to function
over extreme input voltage ranges. In this circuit there are only three valid
configurations. When the voltage is first applied diode D1 quickly becomes ON.
Assume that the initial capacitor voltages are zero. Since the capacitor
voltage is initially zero diode D1 and C2 conducts and supply current to the
load. Also the current flows through C1 as when D1 is ON Vin is identical to
Vc1. Since the RC time constant is very slow compared to the sinusoidal changes
in input supply C2 will not charge up much. As long as D1 is ON Vc1 must track
Vin. This configuration will remain valid shortly after Vin has peaked. Simulation of this configuration is carried
out in MATLAB and the output load voltage and capacitors current as observed
are shown in the figure.
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