WOLFRAM SYSTEMMODELER

ZDiode

Zener diode with 3 working areas

Wolfram Language

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SystemModel["Modelica.Electrical.Analog.Semiconductors.ZDiode"]
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Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

The simple Zener diode is a one port. It consists of the diode itself and an parallel ohmic resistance R. The diode formula is:

                v/Vt                -(v+Bv)/(Nbv*Vt)
  i  =  Ids ( e      - 1) - Ibv ( e                  ).

If the exponent in one of the two branches reaches the limit Maxexp, the diode characteristic is linearly continued to avoid overflow.


The Zener diode model permits (in contrast to the simple diode model) current in reverse direction if the breakdown voltage Bv (also known Zener knee voltage) is exceeded.

The thermal power is calculated by i*v.

Please note: In case of useHeatPort=true the temperature dependence of the electrical behavior is not modelled yet. The parameters are not temperature dependent.

Connectors (3)

p

Type: PositivePin

Description: Positive pin (potential p.v > n.v for positive voltage drop v)

n

Type: NegativePin

Description: Negative pin

heatPort

Type: HeatPort_a

Description: Conditional heat port

Parameters (9)

useHeatPort

Value: false

Type: Boolean

Description: =true, if heatPort is enabled

T

Value: 293.15

Type: Temperature (K)

Description: Fixed device temperature if useHeatPort = false

Ids

Value: 1.e-6

Type: Current (A)

Description: Saturation current

Vt

Value: 0.04

Type: Voltage (V)

Description: Voltage equivalent of temperature (kT/qn)

Maxexp

Value: 30

Type: Real

Description: Max. exponent for linear continuation

R

Value: 1.e8

Type: Resistance (Ω)

Description: Parallel ohmic resistance

Bv

Value: 5.1

Type: Voltage (V)

Description: Breakthrough voltage = Zener- or Z-voltage

Ibv

Value: 0.7

Type: Current (A)

Description: Breakthrough knee current

Nbv

Value: 0.74

Type: Real

Description: Breakthrough emission coefficient

Used in Examples (1)

OvervoltageProtection

Example for Zener diodes