![]() ![]() ![]() Further, because the capacitor is discharging, its current direction will be opposite to that of the charging current. This could occur if a switch introduces or removes component(s) between the charge versus discharge phases. : Simulation results for the circuit of Figure 8.4.2Īs mentioned previously, it is possible for a circuit to have different charge and discharge time constants. Finally, at 50 milliseconds, we see that the capacitor voltage has reached roughly 40 volts, just as predicted. Third, at steady-state the capacitor voltage has virtually reached the maximum value set be the source, or 100 volts. Second, we see that after the predicted five time constants, or 500 milliseconds, the capacitor voltage has plateaued, indicating steady-state. First, we see that the overall shape perfectly echoes the generic curve presented in Figure 8.4.2 It stays at this level for 500 milliseconds before dropping back to 0 volts.Ī transient (i.e., time domain) simulation is run, plotting the capacitor voltage over time for the first 500 milliseconds. This source starts at 0 volts and then immediately steps up to 100 volts. In order to reflect the notion of a time-varying circuit with a switch, the 100 volt DC voltage source has been replaced with a rectangular pulse voltage source. Is entered into a simulator, as shown in Figure 8.4.4 Technical Guide of QUCS - Free ebook download as PDF File. non-linear DC analysis, small signal S parameter circuit analysis, time domain transient analysis and VHDL/Verilog digital circuit simulation. Therefore the capacitor will have reached approximately 40% of 100 volts, or just about 40 volts. ![]() The maximum value here is the source voltage of 100 volts. The point of intersection is at approximately 40% of the maximum value on the vertical axis. Find this value on the horizontal axis and then track straight up to the solid red curve that represents the charging capacitor voltage. The time of 50 milliseconds represents one-half time constant. This value can also be determined graphically from Figure 8.4.2 ![]()
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