There are occasions when one is interested in the steady-state
behaviour of a circuit with periodic inputs
and not so much in * how * it got
there. This is particularly true of many power electronic circuits.
SEQUEL offers the option of efficient SSW computation,
without going through a (possibly) long transient.
The computation techniques implemented in
SEQUEL for this purpose are described in Ref. [1]-[5].

The following table illustrates the dramatic saving in computation
time for a few problems when the SSW method is used.
(N1 indicates the number of cycles required to
reach the steady state by transient simulation, and N2 is the number
of cycles required by the SSW method.)

Example
N1
N2
Buck Converter
750
4
Boost Converter
625
3
Cuk Converter
1250
3
1-phase half-wave rectifier
150
3
1-phase half-controlled bridge converter
110
4
3-phase diode bridge rectifier
200
4

**References**

- T. J. Aprille and T. N. Trick,
"Steady-state analysis of nonlinear circuits with periodic
inputs,"
*Proc. IEEE*, vol. 60, pp. 108-114, 1972. - T. J. Aprille and T. N. Trick,
"A computer algorithm to determine the steady-state response
of nonlinear oscillators,"
*IEEE Trans. Circuit Theory,*vol. 19, pp. 354-360, 1972. - F. R. Colon and T. N. Trick,
"Fast periodic steady-state analysis for large-signal electronic
circuits,"
*IEEE J. Solid-State Circuits*, vol. 8, pp. 260-269, 1973. - T. N. Trick, F. R. Colon, and S. P. Fan,
"Computation of capacitor voltage and inductor current
sensitivities with respect to initial conditions for the
steady-state analysis of nonlinear periodic circuits,"
*IEEE Trans. Circuits and Systems*, vol. 22, pp. 391-396, 1975. - M. B. Patil, M. C. Chandorkar, B. G. Fernandes, and K. Chatterjee,
"Computation of steady-state response in power electronic circuits,"
*IETE J. Research,*vol. 48, no. 6, pp. 471-477, Nov. 2002.