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246 3. Reference Manual
Now we use TEMP as independent variable. This causes the time derivative due to C1 to be set to
zero and Time to be replaced by the value of InitialTime.
Designate temperature as
independent variable.
In[28]:= CircuitEquations[tempckt, AnalysisMode −> Transient,
IndependentVariable −> TEMP] // DisplayForm
Out[28]//DisplayForm=
V$1TEMP V$2TEMP
I$V1TEMP
⩵⩵ 0,
1 TC11 TEMP R10
V$2TEMP V$1TEMP V$2TEMP
⩵⩵ 0, V$1TEMP ⩵⩵
1 TC12 TEMP R20 1 TC11 TEMP R10
V1, V$1TEMP, V$2TEMP, I$V1TEMP, DesignPoint
This assigns an initial
condition to the inductor
L1.
In[29]:= rlcfic = Netlist[
{V1, {1, 0}, V},
{R1, {1, 2}, R},
{L1, {2, 3}, Value −> L, InitialCondition −> iL0},
{C1, {3, 0}, C}
]
Out[29]= NetlistRaw, 4
By default, initial conditions are ignored by CircuitEquations. To use the given initial conditions,
you must specify InitialConditions −> Automatic or InitialConditions −> All.
Set up circuit equations
for transient analysis.
In[30]:= CircuitEquations[rlcfic,
AnalysisMode −> Transient] // DisplayForm
Out[30]//DisplayForm=
V$1t V$2t
I$V1t ⩵⩵ 0,
R
V$1t V$2t
I$L1t ⩵⩵ 0, I$L1t C V$3 ′ t ⩵⩵ 0,
R
V$1t ⩵⩵ V, V$2t V$3t L I$L1 ′ t ⩵⩵ 0,
V$1t, V$2t, V$3t, I$V1t, I$L1t, DesignPoint
Use initial conditions only
where specified explicitly.
Use given initial
conditions, set all other
initial conditions to zero.
In[31]:= CircuitEquations[rlcfic, AnalysisMode −> Transient,
InitialConditions −> Automatic] // DisplayForm
Out[31]//DisplayForm=
V$1t V$2t
I$V1t ⩵⩵ 0,
R
V$1t V$2t
I$L1t ⩵⩵ 0, I$L1t C V$3 ′ t ⩵⩵ 0,
R
V$1t ⩵⩵ V, V$2t V$3t L I$L1 ′ t ⩵⩵ 0, I$L10 ⩵⩵ iL0,
V$1t, V$2t, V$3t, I$V1t, I$L1t, DesignPoint
In[32]:= CircuitEquations[rlcfic, AnalysisMode −> Transient,
InitialConditions −> All] // DisplayForm
Out[32]//DisplayForm=
V$1t V$2t
V$1t V$2t
I$V1t ⩵⩵ 0, I$L1t ⩵⩵ 0,
R
R
I$L1t C V$3 ′ t ⩵⩵ 0, V$1t ⩵⩵ V,
V$2t V$3t L I$L1 ′ t ⩵⩵ 0, I$L10 ⩵⩵ iL0, V$30 ⩵⩵ 0,
V$1t, V$2t, V$3t, I$V1t, I$L1t, DesignPoint