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248 3. Reference Manual
Replace all parameters in
device model equations by
numerical values.
In[37]:= CircuitEquations[rectifier, AnalysisMode −> Transient,
ElementValues −> Symbolic, Symbolic −> None
] // DisplayForm
Out[37]//DisplayForm=
I$AC$D1t I$V1t ⩵⩵ 0, I$AC$D1t
V$2t CL V$2 ′ t ⩵⩵ 0,
RL
V$1t ⩵⩵ Vin, I$AC$D1t ⩵⩵
1. 10 14 1 38.6635 V$1tV$2t 1. 10 12 V$1t V$2t,
V$1t, V$2t, I$V1t, I$AC$D1t, DesignPoint
Vin 5 Sin100 Π t, RL 1000., CL 0.000022
Finally, the Symbolic option allows you to specify for each device or group of devices the parameters
which CircuitEquations should keep in symbolic form.
Keep only the parameters
AREA and TEMP of all
diode instances "D*" in
symbolic form, replace all
other model parameters by
numerical values.
Use the symbol Τ to
denote time.
In[38]:= CircuitEquations[rectifier,
AnalysisMode −> Transient, ElementValues −> Symbolic,
Symbolic −> {"D*" −> {AREA, TEMP}}] // DisplayForm
Out[38]//DisplayForm=
I$AC$D1t I$V1t ⩵⩵ 0,
I$AC$D1t
V$2t CL V$2 ′ t ⩵⩵ 0, V$1t ⩵⩵ Vin,
RL
I$AC$D1t ⩵⩵ 3.69815 10 22 12881.4 1.0.00333167 TEMP
AREA$D1
TEMP
11604.8 V$1tV$2t
1
TEMP
TEMP 3. 1. 10 12 V$1t V$2t,
V$1t, V$2t, I$V1t, I$AC$D1t, DesignPoint
Vin 5 Sin100 Π t, RL 1000.,
CL 0.000022, AREA$D1 1., TEMP 300.15
In[39]:= CircuitEquations[tempckt, AnalysisMode −> Transient,
TimeVariable −> \[Tau]] // DisplayForm
Out[39]//DisplayForm=
V$1Τ V$2Τ
I$V1Τ
⩵⩵ 0,
1 TC11 TEMP R1Τ
V$2Τ
1 TC12 TEMP R2Τ V$1Τ V$2Τ
1 TC11 TEMP R1Τ C1 V$2′ Τ ⩵⩵ 0,
V$1Τ ⩵⩵ V1, V$1Τ, V$2Τ, I$V1Τ, DesignPoint
With the default settings
Symbolic −> All and Value −> None, all device parameters of the diode appear in symbolic form
when you set up a system of circuit equations with ElementValues −> Symbolic.