Ripple voltage circuit (voltage regulated power supply circuit)
Limiting circuit with AC and DC
1)Limiting circuit:
from preparation:
find resistor value by approximation of circuit in figure 4-1 (V1=5V, Vf = 0.7V, Id=5mA), find diode voltage.
find current and voltage in diode by running PSpice bias analysis.
plot VI characteristic of diode by running DC sweep, and plot on the same graph load line (trace load line equation), find current and voltage of diode.
plot transfer characteristic of circuit by running DC sweep, describe (graph or sketch) the output waveform of +-5V triangle wave.
run transient analysis for circuit where V1 is +-5V triangle wave, plot output.
run transient analysis with Vsin (ampl=1mV, freq=1KHz) in series with V1 (Id=IDC+iAC), plot output, build a piece-wise linear model (Id=I0exp(V/nVT), n=1, VT=25mV).
repeat the above transient analysis with Vsin (ampl=6mV, freq=1KHz), plot output.
from procedure:
plot the VI characteristic for the diode obtained using "iv_curve.vi".
show diode's current and voltage obtained from experimental measurements in lab for circuit in figure 4-1.
2)Half-wave rectifier:
from preparation:
find diode current value by approximation of circuit in figure 4-2 (use V1=5V, Vf = 0.7V, R1=3.3K), find diode voltage.
find current and voltage in diode by running PSpice bias analysis.
plot VI characteristic of diode by running DC sweep, and plot on the same graph load line (trace load line equation), find current and voltage of diode.
plot transfer characteristic of circuit by running DC sweep, describe (graph or sketch) the output waveform of +-5V triangle wave.
run transient analysis for circuit where V1 is +-5V triangle wave, plot output.
from procedure:
plot the VI characteristic for the diode obtained using "iv_curve.vi".
show diode's current and voltage obtained from experimental measurements in lab for circuit in figure 4-2.
show output AC (rms & pp) and DC voltage values obtained from experimental measurements in lab for circuit in figure 4-2 using sine wave source (10V, 60Hz).
3)Full-wave rectifier:
from preparation:
plot transfer characteristic of circuit in figure 4-3 by running DC sweep, describe (graph or sketch) the output waveform of 10V pp sine wave input.
run transient analysis for circuit in figure 4-3, plot output.
from procedure:
plot the transfer characteristic for circuit in figure 4-3 using "transchar.vi".
show output AC (rms & pp) and DC voltage values obtained from experimental measurements in lab for circuit in figure 4-3 using sine wave source (10V, 60Hz).
show output pp voltage for same circuit after adding 1F capacitor in parallel with 1K resistor and 10 resistor in series with any diode, repeat with 10F and 100F.
plot output waveform in 10resistor for 1F, 10F and 100F cases.
from analysis:
what percentage of time are diodes conducting as seen in the wavefront in zener diode, for all cases (1F, 10F and 100F).
use PSpice to find output voltage for different capacitor values including those in the procedure section, plot voltage vs. capacitor, check if measured values agree with the plot.
4)Ripple voltage circuit (voltage regulated power supply circuit):
from preparation:
run transient analysis for circuit in figure 4-4 without load (only capacitor, no resistor and zener diode), plot output.
run transient analysis of circuit with load (capacitor plus resistor and zener diode), find resistor value to obtain 10% less DC output voltage, plot output.
from procedure:
show the zener AC (rms & pp) and DC voltage values obtained from experimental measurements in lab for circuit in figure 4-4, use resistor box at 220K in parallel with zener diode.
show resistor box reduced value to achieve 10% decrease in output value.
5)Limiting Circuit with AC and DC:
from procedure:
show output AC (rms & pp) and DC current values obtained from experimental measurements in lab for circuit in figure 4-5 for all three cases: (0V, 0.5V, 0.7V DC).
from analysis:
analyze circuit in figure 4-5 using piecewise linear model to find pp voltage, compare results with lab measurements.
