Diode2
Improved diode model
Library
Modelica/Electrical/Analog/Semiconductors
Description
This diode model is an improved version of the simple diode model. It includes a series resistance, parallel conductance, and also models reverse breakdown. The model is divided into three parts:
- lower half of reversed bias region including breakdown: -Ids·(exp(-(vd+Bv)/(N·Vt)) + 1 - 2·exp(-Bv/(2·N·Vt)))
- upper half of reverse biased region and forward biased region before conduction: Ids·(exp(vd/(N·Vt)) - 1)
- forward biased region after conduction: iVdMax + (vd - VdMax)·diVdMax
Temperature dependent behaviour is modelled when useHeatPort=true. In that case, the Vt parameter is ignored, and Vt is computed as k·T/q, where
- k is Boltzmann's constant
- T is the heat port temperature.
- q is the electron charge.
Parameters
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_T_heatPort | T_heatPort | T_heatPort | Structure | |
mo_T_heatPort/fixed | fixed | Cell of scalars | true | |
mo_T_heatPort/start | start | Cell of scalars | ||
mo_useHeatPort | useHeatPort | =true, if heatPort is enabled | Number | 0 |
mo_T | T | Fixed device temperature if useHeatPort = false | Scalar | |
mo_Vf | Vf | Forward voltage | Scalar | |
mo_Ids | Ids | Reverse saturation current | Scalar | |
mo_Rs | Rs | Ohmic resistance | Scalar | |
mo_Vt | Vt | Thermal voltage (kT/q), 0.026 at normal conditions (around 20 degC) | Scalar | |
mo_N | N | Emission coefficient | Scalar | |
mo_Bv | Bv | Reverse breakdown voltage | Scalar | |
mo_Gp | Gp | Parallel conductance for numerical stability | Scalar |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo__nmodifiers | Number of Modifiers | Specifies the number of modifiers | Number | |
mo__modifiers | Modifiers | Add new modifier | Structure | |
mo__modifiers/varname | Variable name | Cell of strings | 'v' | |
mo__modifiers/attribute | Attribute | Cell of strings | 'start' | |
mo__modifiers/value | Value |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
p | implicit | Positive electrical pin | input | 1 |
n | implicit | Negative electrical pin | output | 1 |
Port 3 | implicit | Conditional heat port | input | mo_useHeatPort |