The Quasistatic Single Phase Ideal Commuting Switch (or Ideal Commuting Switch) component models a three-terminal, single-pole, electrical switch that commutes a common terminal between a normally closed terminal ($\mathrm{n1}$) and a normally opened terminal ($\mathrm{n2}$). The common terminal is controlled by a Boolean signal. When the input signal is false, the common terminal is connected to the normally closed terminal; otherwise, it is connected to the normally opened terminal.

To prevent singularities during switching, the opened switch has a (very low) default conductance $G_{\mathrm{off}}$ and the closed switch has a (very low) default resistance $R_{\mathrm{on}}$. The limiting case is allowed, i.e., the closed resistance and open conductance can be exactly zero.

The model includes a Conditional heat port, but no temperature dependency.

Use with care: This switch is only intended to be used for structural changes, not for fast switching sequences, due to the quasistatic formulation.

$i_{n_1}\=-s_1{1}_V\{\begin{array}{cc}{G}_{\mathrm{off}}& \mathrm{control}\\ 1& \mathrm{otherwise}\end{array}$

$i_{n_2}\=-s_2{1}_V\{\begin{array}{cc}1& \mathrm{control}\\ G_{\mathrm{off}}& \mathrm{otherwise}\end{array}$

$i_p\+i_{n_2}\+i_{n_1}\=0$

$v_p-v_{n_1}\=s_1{1}_A\{\begin{array}{cc}1& \mathrm{control}\\ R_{\mathrm{on}}& \mathrm{otherwise}\end{array}$

$v_p-v_{n_2}\=s_2{1}_A\{\begin{array}{cc}{R}_{\mathrm{on}}& \mathrm{control}\\ 1& \mathrm{otherwise}\end{array}$

$P_{\mathrm{loss}}\=\Re \left(v_p\stackrel{\&conjugate0;}{i_p}\+v_{n_1}\stackrel{\&conjugate0;}{i_{n_1}}\+v_{n_2}\stackrel{\&conjugate0;}{i_{n_2}}\right)$

${\mathrm{\gamma }}_p\={\mathrm{\gamma }}_{n_1}\={\mathrm{\gamma }}_{n_2}$

$T_{\mathrm{hp}}\=\{\begin{array}{cc}{T}_{\mathrm{heatPort}}& \mathrm{Use\; Heat\; Port}\\ T& \mathrm{otherwise}\end{array}$

The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.