I am currently a 2nd year HNC electronics student and am investigating unregulated non-linear power supplies which convert 230v AC I/P supply into 10v D.C supply by means of a transformer, bridge rectifier, reservior capactior and a low pass filter (smoothing circuit), as per the below diagram, except with a resistor in place of the inductor and a Load Resistor placed on the D.C terminals
Under simulation on a software package, changing the Load resistor in decade steps from 1Ω to 10KΩ gave the following results:
Load Resistor Value __Load Voltage (VL) __Load Current__ Ripple (Pk/Pk)
1 Ω................................ 99.38 mV.................. 9.38 mA .............60 mV
10 Ω ..............................920.5 mV ..................92.05 mA ...........440 mV
100 Ω .............................5.472 V ....................54.72 mA........... 460 mV
1000 Ω ..........................11.39 V ......................11.4 mA ............100 mV
10000 Ω......................... 12.57 V ....................1.269 mA ............10.8 mV
Now i understand what these results are telling me although i cannot understand or explain why the ripple (A.C component within the D.C supply) increases than decreases again.
PLEASE HELP!!!!!
Under simulation on a software package, changing the Load resistor in decade steps from 1Ω to 10KΩ gave the following results:
Load Resistor Value __Load Voltage (VL) __Load Current__ Ripple (Pk/Pk)
1 Ω................................ 99.38 mV.................. 9.38 mA .............60 mV
10 Ω ..............................920.5 mV ..................92.05 mA ...........440 mV
100 Ω .............................5.472 V ....................54.72 mA........... 460 mV
1000 Ω ..........................11.39 V ......................11.4 mA ............100 mV
10000 Ω......................... 12.57 V ....................1.269 mA ............10.8 mV
Now i understand what these results are telling me although i cannot understand or explain why the ripple (A.C component within the D.C supply) increases than decreases again.
PLEASE HELP!!!!!