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Electronics Forum / CAD / December 2007Problem with input waveform (voltage) while using PSpice
I am constructing and simulating a full-wave rectifier circuit using the PSpice software. The circuit consists of an ac source, 4 BJTs in a bridge design, and a resistor and capacitor connected in parallel after the bridge. An input probe is placed near the ac source, and an output probe is placed at the junction between the resistor and the capacitor. The output waveform shows a desired dc voltage. However, the input waveform fluctuates between +9.2011V and -835.622mV, and not the required +/-10V. How can I get an input waveform of +/-10V? When I connect the ac source to a separate (and simpler) circuit, the input waveform shows +/-10V. Why is it that the input waveform can change with different circuits? >I am constructing and simulating a full-wave rectifier circuit using >the PSpice software. The circuit consists of an ac source, 4 BJTs in a [quoted text clipped - 7 lines] >waveform shows +/-10V. Why is it that the input waveform can change >with different circuits? Post your Spice netlist (I think thats the .out file) if it's not too long. Sounds like you have your source configured wrong or connected wrong. If I couldnt work out if a simple bridge worked without using spice I would seriously give up electronics. If spice cant even get that right then god help us ! >If I couldnt work out if a simple bridge worked without using spice I >would seriously give up electronics. > >If spice cant even get that right then god help us ! Thus speaks the village idiot ;-) ...Jim Thompson | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | America: Land of the Free, Because of the Brave >I am constructing and simulating a full-wave rectifier circuit using > the PSpice software. The circuit consists of an ac source, 4 BJTs in a [quoted text clipped - 7 lines] > waveform shows +/-10V. Why is it that the input waveform can change > with different circuits? Hello, Your observed waveform (+9.2V,-0.8V) referenced to GND is correct. If you probe directly across the voltage source, you will see the +/-10V. Best regards, Helmut Netlist version for every SPICE, test.cir * Rectifier D2 vb out 1N914 D3 0 va 1N914 D4 0 vb 1N914 V1 va vb SINE(0 10 50) R1 out 0 100 C1 out 0 1m .lib C:\Programme\LTC\SwCADIII\lib\cmp\standard.dio .tran 100m .end Schematic version for LTspice, test.asc Version 4 SHEET 1 880 680 WIRE 64 96 -96 96 WIRE 144 96 64 96 WIRE 192 96 144 96 WIRE 384 96 256 96 WIRE -96 160 -96 96 WIRE 208 208 96 208 WIRE 384 208 384 96 WIRE 384 208 272 208 WIRE 448 208 384 208 WIRE 496 208 448 208 WIRE 384 224 384 208 WIRE 496 224 496 208 WIRE -96 320 -96 240 WIRE 64 320 -96 320 WIRE 96 320 96 208 WIRE 96 320 64 320 WIRE 144 352 144 96 WIRE 208 352 144 352 WIRE 304 352 272 352 WIRE 384 352 384 304 WIRE 384 352 304 352 WIRE 496 352 496 288 WIRE 496 352 384 352 WIRE 496 384 496 352 WIRE 96 448 96 320 WIRE 208 448 96 448 WIRE 304 448 304 352 WIRE 304 448 272 448 FLAG 496 384 0 FLAG 448 208 out FLAG 64 96 va FLAG 64 320 vb SYMBOL diode 192 112 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode 208 224 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D2 SYMATTR Value 1N914 SYMBOL diode 272 336 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName D3 SYMATTR Value 1N914 SYMBOL diode 272 432 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName D4 SYMATTR Value 1N914 SYMBOL voltage -96 144 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value SINE(0 10 50) SYMBOL res 368 208 R0 SYMATTR InstName R1 SYMATTR Value 100 SYMBOL cap 480 224 R0 SYMATTR InstName C1 SYMATTR Value 1m TEXT -104 8 Left 0 !.tran 100m TEXT -104 32 Left 0 !.options plotwinsize=0 > I am constructing and simulating a full-wave rectifier circuit using > the PSpice software. The circuit consists of an ac source, 4 BJTs in a [quoted text clipped - 7 lines] > waveform shows +/-10V. Why is it that the input waveform can change > with different circuits? Load!  Signature"I'd rather have a bottle in front of me than a frontal lobotomy" http://webpages.charter.net/jamie_5 |
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