Diode 2 - MapleSim Help
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Diode 2

Improved diode model

 

Description

Equations

Variables

Connections

Parameters

Modelica Standard Library

Description

The Diode 2 component extends the basic Diode as follows:

• 

It models reverse breakdown.

• 

The parameters are those typically published for real-world diodes.

• 

A series resistance has been added.

• 

The parallel resistance has been replaced by a conductance, which can be set to zero.

The model consists of a pure diode section, a resistance, Rs, in series with the pure diode, and a conductance, Sp, in parallel with the pure diode. The current, Id, through the pure diode is given in the following table.

Region

Condition

Current

Lower half of reverse biased region.

Vd<Bv2

Id&equals;IdsexpVd&plus;BvNVT&plus;12expBv2NVT

Upper half of reversed biased region, and forward biased region before conduction.

Bv2Vd<Vdmax

Id&equals;IdsexpVdNVT1

Forward biased region after conduction.

VdVdmax

Id&equals;IVdmax&plus;VdVdmaxGVdmax

where

• 

Vd is the voltage across the pure diode,

• 

VT&equals;kTq is the thermal voltage (k is the Boltzmann constant, q is the elementary charge),

• 

Vdmax&equals;Vf&plus;NVT is the linear continuation threshold,

• 

IVdmax&equals;IdsexpVdmaxNVT1 is the current at that threshold, and

• 

GVdmax&equals;IdsexpVdmaxNVTNVT is the conductance at the threshold.

Equations

i&equals;ip&equals;in&equals;VdSp&plus;{IdsexpVd&plus;BvNVT&plus;12exp−12BvNVTVd<Bv2IdsexpVdNVT1Vd<VdmaxiVdmax&plus;VdVdmaxGVdmax

v&equals;vpvn&equals;Rsi&plus;Vd

Td&equals;{TheatPortUse Heat PortTotherwise

VT&equals;kTheatPortq

LossPower&equals;vi

Variables

Name

Units

Description

Modelica ID

v

V

Voltage drop between the two pins

v

vx

V

Voltage at pin x, xn&comma;p

x.v

i

A

Current flowing from pin p to pin n

i

ix

A

Current into pin x, xn&comma;p

x.i

LossPower

W

Loss power leaving component via HeatPort

LossPower

TheatPort

K

Temperature of HeatPort

T_heatPort

Connections

Name

Description

Modelica ID

p

Positive pin

p

n

Negative pin

n

Heat Port

Conditional heat port

heatPort

Parameters

Name

Default

Units

Description

Modelica ID

Bv

100

V

Reverse breakdown voltage

Bv

Ids

1·10−13

A

Reverse saturation current

Ids

N

1

1

Emission coefficient

N

Rs

16

Ω

Series resistance

Rs

Gp

1·10−6

S

Parallel conductance for numerical stability

Gp

T

293.15

K

Fixed device temperature if Use Heat Port is false

T

Vf

0.7

V

Forward voltage

Vf

VT

Modelica.Constants.RTModelica.Constants.F

V

Thermal voltage (kT/q), 0.026 at normal conditions (around 20 degC)

Vt

Use Heat Port

false

 

True (checked) means heat port is enabled

useHeatPort

Modelica Standard Library

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.

See Also

Diodes

Electrical Library

Semiconductors