Environmental Engineering Reference
In-Depth Information
where and are the response of sampled-data simulation and
PSPICB, respectively. It can be obtained directly from the responses,
and is shown in Fig.7.19. It is seen that the maximum normalized dif-
ference is below 0.5%.
At the switching instants, a direct comparison of the results from
sampled-data simulation and PSPICE is difficult. The reason is as fol-
lows: If a switching action causes response discontinuity at al-
though the inconsistent initial conditions immediately before and after
switching and can be obtained from sampled-data simula-
tion, they can not be obtained from PSPICE. For traditional integration
methods, such as those used in PSPICE, the continuity of network vari-
ables is required. In order to handle a rapid change in the response,
very small time steps must be taken to ensure the accuracy of integra-
tion. No time point can be clearly defined as a switching instant. At the
switching instants, the initial conditions from sampled-data simulation
are verified by checking the charge conservation before and after switch-
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