Optocoupler

A dynamic model (or behavioral model) of an optocoupler consisting of an LED, a current sensor, and a controlled current source.

blockType: AcausalElectricPowerSystems.Semiconductors.Optocoupler

Path in the library:

/Physical Modeling/Electrical/Semiconductors & Converters/Optocoupler

Description

Block Optocoupler It is an optocoupler consisting of the following components:

An exponential LED connected in series with an input current sensor;
Controlled output current source.

The output current flows from the collector to the emitter. It is equal to , where – the value of the current transmission coefficient, and – diode current.

Use the block Optocoupler for interfacing two electrical circuits without direct galvanic connection. For example, if two circuits operate at different voltage levels.

Each electrical circuit must have its own block Electrical Reference.

If there is a phototransistor at the output of the optocoupler, the values of the parameter Current transfer ratio usually make up 0.1-0.5. If the output of the optocoupler is represented by a Darlington pair (composite transistor), the parameter value is Current transfer ratio could be much higher than that. Value Current transfer ratio may vary depending on the LED current, but this effect is not simulated in the unit Photodiode.

Some manufacturers specify the maximum data transfer rate for optocouplers. In practice, the maximum data transfer rate depends on the following parameters:

Photodiode capacity and control circuit type;
The design of the phototransistor and its corresponding capacity.

In the block Optocoupler it is possible to set the capacitance of only the light-emitting diode. You can use the parameter Junction capacitance to set your own capacitance data between collector and emitter.

Block Optocoupler allows you to simulate the temperature dependence of the base diode. For more information, see Diode.

Thermal port

You can turn on the thermal port to simulate the mutual influence of the device’s heat dissipation and its temperature. To account for thermal effects, check the box Enable thermal port.

Assumptions and limitations

The section of the circuit at the output of the optocoupler is modeled as a controlled current source. Thus, it only correctly approximates a bipolar transistor operating in its normal active region. To create a more detailed model, connect the optocoupler output directly to the base of the NPN bipolar transistor unit and adjust the parameters so as to maintain the correct overall value of the current transfer coefficient. If you need to connect the optocouplers in series, use this approach to avoid the unacceptable topology of two series-connected current sources.
The temperature dependence of the current transfer coefficient is not modeled. Usually, the temperature dependence of this parameter is much less than the temperature dependence of the voltage-ampere characteristic (VAC) of an optical diode.
To prevent problems with numerical simulation, the usage of non-zero values of ohmic resistance and junction capacitance may be required, but numerical calculation can go faster if these values are set to zero.

Ports

Conserving

# + — positive
electricity

Details

The electrical port connected to the positive terminal.

Program usage name

p

# - — negative
electricity

Details

The electrical port connected to the negative terminal.

Program usage name

n

# With — collector
electricity

Details

The electrical port connected to the collector terminal of the transistor.

Program usage name

collector

# E — The emitter
electricity

Details

The electrical port connected to the transistor emitter terminal.

Program usage name

emitter

# H — thermal port
warm

Details

Thermal non-directional port.

Dependencies

To enable this port, check the box Enable thermal port.

Program usage name

thermal_port

Parameters

Main

# Current transfer ratio — current transmission ratio

Details

The output current flowing from the collector to the emitter of the transistor is equal to the product of the current transfer coefficient and the current of the LED.

Default value	`0.2`
Program usage name	`CTR`
Evaluatable	Yes

# Parameterization — parameterization of the model
Use I-V curve data points | Use parameters IS and N

Details

Choose one of the following methods for parameterizing the model:

Use I-V curve data points — set the measured data at two points of the curve of the volt-ampere characteristic of the diode.
Use parameters IS and N — set the saturation current ( ) and the emission coefficient ( ).

Values	`Use I-V curve data points` \| `Use parameters IS and N`
Default value	`Use I-V curve data points`
Program usage name	`parameterization`
Evaluatable	No

# Currents [I1 I2] — vector of current values at two points
A | pA | nA | uA | mA | kA | MA

Details

The vector of current values at two points of the curve of the volt-ampere characteristic of the diode, which the unit uses to calculate the saturation current (IS) and the emission coefficient (N).

Dependencies

To use this parameter, set for the parameter Parameterization meaning Use I-V curve data points.

Units	`A` \| `pA` \| `nA` \| `uA` \| `mA` \| `kA` \| `MA`
Default value	`[0.001, 0.015] A`
Program usage name	`I_vector`
Evaluatable	Yes

# Voltages [V1 V2] — vector of voltage values at two points
V | uV | mV | kV | MV

Details

The vector of voltage values at two points of the curve of the volt-ampere characteristic of the diode, which the unit uses to calculate the saturation current ( ) and the emission coefficient ( ).

Dependencies

To use this parameter, set for the parameter Parameterization meaning Use I-V curve data points.

Units	`V` \| `uV` \| `mV` \| `kV` \| `MV`
Default value	`[0.9, 1.05] V`
Program usage name	`V_vector`
Evaluatable	Yes

# Saturation current, IS — saturation current
A | pA | nA | uA | mA | kA | MA

Details

The amount of current that the ideal diode equation approaches asymptotically for very large levels of reverse bias.

Dependencies

To use this parameter, set for the parameter Parameterization meaning Use parameters IS and N.

Units	`A` \| `pA` \| `nA` \| `uA` \| `mA` \| `kA` \| `MA`
Default value	`1e-10 A`
Program usage name	`I_sat`
Evaluatable	Yes

# Emission coefficient, N — diode emission coefficient

Details

Diode emission coefficient or ideality coefficient.

Dependencies

To use this parameter, set for the parameter Parameterization meaning Use parameters IS and N.

Default value	`2.0`
Program usage name	`N`
Evaluatable	Yes

# Ohmic resistance, RS — diode resistance
Ohm | mOhm | kOhm | MOhm | GOhm

Details

Serial ohmic resistance of the diode.

Units	`Ohm` \| `mOhm` \| `kOhm` \| `MOhm` \| `GOhm`
Default value	`0.1 Ohm`
Program usage name	`R_s`
Evaluatable	Yes

Details

The temperature at which the saturation current was measured ( ) or the volt-ampere characteristic of the diode.

Units	`K` \| `degC` \| `degF` \| `degR` \| `deltaK` \| `deltadegC` \| `deltadegF` \| `deltadegR`
Default value	`25.0 degC`
Program usage name	`T_measurement`
Evaluatable	Yes

Junction Capacitance

# Capacitance — simulation of the diode junction capacitance
Fixed or zero junction capacitance | Use C-V curve data points | Use parameters CJ0, VJ, M & FC

Details

Select one of the following options for modeling the capacitance of the diode junction:

Fixed or zero junction capacitance — set the transition capacity as a fixed value;
Use C-V curve data points — set the measured data at three points of the C-V curve of the diode;
Use parameters CJ0, VJ, M & FC — set the transition capacity at zero displacement, the contact potential difference of the transition, the coefficient that takes into account the smoothness of the transition, and the coefficient of nonlinearity of the barrier capacity of the transition at forward displacement.

Values	`Fixed or zero junction capacitance` \| `Use C-V curve data points` \| `Use parameters CJ0, VJ, M & FC`
Default value	`Fixed or zero junction capacitance`
Program usage name	`C_parameterization`
Evaluatable	No

# Junction capacitance — transfer capacity
F | pF | nF | uF | mF

Details

Fixed value of the transition capacity.

Dependencies

To use this parameter, set for the parameter Capacitance meaning Fixed or zero junction capacitance.

Units	`F` \| `pF` \| `nF` \| `uF` \| `mF`
Default value	`5.0 pF`
Program usage name	`C_j`
Evaluatable	Yes

# Zero-bias junction capacitance, CJ0 — transition capacity at zero offset
F | pF | nF | uF | mF

Details

The value of the capacitance connected in parallel with the exponential diode.

Dependencies

To use this parameter, set for the parameter Capacitance meaning Use parameters CJ0, VJ, M & FC.

Units	`F` \| `pF` \| `nF` \| `uF` \| `mF`
Default value	`5.0 pF`
Program usage name	`C_j0`
Evaluatable	Yes

# Junction potential, VJ — contact potential difference of the transition
V | uV | mV | kV | MV

Details

The contact potential difference of the junction.

Dependencies

To use this parameter, set for the parameter Capacitance meaning Use parameters CJ0, VJ, M & FC.

Units	`V` \| `uV` \| `mV` \| `kV` \| `MV`
Default value	`1.0 V`
Program usage name	`V_j`
Evaluatable	Yes

# Grading coefficient, M — a coefficient that takes into account the smoothness of the transition

Details

A coefficient that quantifies the smoothness of the p-n transition.

Dependencies

To use this parameter, set for the parameter Capacitance meaning Use parameters CJ0, VJ, M & FC.

Default value	`0.5`
Program usage name	`grading_coefficient`
Evaluatable	Yes

# Reverse bias voltages [VR1 VR2 VR3] — reverse displacement stress vector
V | uV | mV | kV | MV

Details

The vector of reverse bias voltage values at the three points C-V of the diode curve, which the unit uses to calculate , and .

Dependencies

To use this parameter, set for the parameter Capacitance meaning Use C-V curve data points.

Units	`V` \| `uV` \| `mV` \| `kV` \| `MV`
Default value	`[0.1, 10.0, 100.0] V`
Program usage name	`V_r_vector`
Evaluatable	Yes

# Corresponding capacitances [C1 C2 C3] — the vector of capacitances corresponding to the vector of reverse displacement stresses
F | pF | nF | uF | mF

Details

The vector of capacitance values at three points on the C-V curve of the diode, which the unit uses to calculate , and .

Dependencies

To use this parameter, set for the parameter Capacitance meaning Use C-V curve data points.

Units	`F` \| `pF` \| `nF` \| `uF` \| `mF`
Default value	`[3.5, 1.0, 0.4] pF`
Program usage name	`C_r_vector`
Evaluatable	Yes

# Capacitance coefficient, FC — coefficient of non-linearity of the barrier capacity of the junction at forward displacement

Details

A coefficient that quantifies the decrease in discharge capacity with applied voltage.

Dependencies

To use this parameter, set for the parameter Capacitance meaning Use parameters CJ0, VJ, M & FC or Use C-V curve data points.

Default value	`0.5`
Program usage name	`C_coefficient`
Evaluatable	Yes

Temperature Dependence

# Parameterization — parameterization of temperature dependence
None - Use characteristics at parameter measurement temperature | Use an I-V data point at second measurement temperature | Specify saturation current at second measurement temperature | Specify the energy gap, EG

Details

Choose one of the following methods for parameterizing the temperature dependence:

None - Use characteristics at parameter measurement temperature — the temperature dependence is not modeled, the measurement temperature is used for modeling Measurement temperature.
Use an I-V data point at second measurement temperature — when selecting this value, you need to specify the temperature of the second measurement, as well as the values of current and voltage at this temperature. The model uses these values together with the parameter values at the temperature of the first measurement to calculate the value of the band gap.
Specify saturation current at second measurement temperature — when this value is selected, the temperature of the second measurement and the saturation current value at this temperature are set. The model uses these values together with the parameter values at the temperature of the first measurement to calculate the value of the band gap.
Specify the energy gap, EG — the value of the forbidden zone width is set manually.

Values	`None - Use characteristics at parameter measurement temperature` \| `Use an I-V data point at second measurement temperature` \| `Specify saturation current at second measurement temperature` \| `Specify the energy gap, EG`
Default value	`None - Use characteristics at parameter measurement temperature`
Program usage name	`T_parameterization`
Evaluatable	No

# Saturation current, IS, at second measurement temperature — saturation current at the temperature of the second dimension
A | pA | nA | uA | mA | kA | MA

Details

Specify the saturation current value at the temperature of the second dimension.

Dependencies

To use this parameter, set for the parameter Parameterization meaning Specify saturation current at second measurement temperature.

Units	`A` \| `pA` \| `nA` \| `uA` \| `mA` \| `kA` \| `MA`
Default value	`1.8e-08 A`
Program usage name	`I_sat_at_T2_measurement`
Evaluatable	Yes

# Current I1 at second measurement temperature — current I1 at the temperature of the second measurement
A | pA | nA | uA | mA | kA | MA

Details

Specify the current value on the diode, when the voltage is , at the temperature of the second dimension.

Dependencies

To use this parameter, set for the parameter Parameterization meaning Use an I-V data point at second measurement temperature.

Units	`A` \| `pA` \| `nA` \| `uA` \| `mA` \| `kA` \| `MA`
Default value	`0.029 A`
Program usage name	`I_point_at_T2_measurement`
Evaluatable	Yes

# Voltage V1 at second measurement temperature — voltage V1 at the temperature of the second measurement
V | uV | mV | kV | MV

Details

Specify the voltage value on the diode, when the current is equal to , at the temperature of the second dimension.

Dependencies

To use this parameter, set for the parameter Parameterization meaning Use an I-V data point at second measurement temperature.

Units	`V` \| `uV` \| `mV` \| `kV` \| `MV`
Default value	`1.05 V`
Program usage name	`V_point_at_T2_measurement`
Evaluatable	Yes

Details

Specify the value for the temperature of the second measurement.

Dependencies

To use this parameter, set for the parameter Parameterization meaning Use an I-V data point at second measurement temperature or Specify saturation current at second measurement temperature.

Units	`K` \| `degC` \| `degF` \| `degR` \| `deltaK` \| `deltadegC` \| `deltadegF` \| `deltadegR`
Default value	`125.0 degC`
Program usage name	`T2_measurement`
Evaluatable	Yes

# Energy gap parameterization — parameterization of the band gap width
Use nominal value for silicon (EG=1.11eV) | Use nominal value for 4H-SiC silicon carbide (EG=3.23eV) | Use nominal value for 6H-SiC silicon carbide (EG=3.00eV) | Use nominal value for germanium (EG=0.67eV) | Use nominal value for gallium arsenide (EG=1.43eV) | Use nominal value for selenium (EG=1.74eV) | Use nominal value for Schottky barrier diodes (EG=0.69eV) | Specify a custom value

Details

Select a restricted area width value from the list of preset parameters or specify a custom value.:

Use nominal value for silicon (EG=1.11eV) — default value;
Use nominal value for 4H-SiC silicon carbide (EG=3.23eV);
Use nominal value for 6H-SiC silicon carbide (EG=3.00eV);
Use nominal value for germanium (EG=0.67eV);
Use nominal value for gallium arsenide (EG=1.43eV);
Use nominal value for selenium (EG=1.74eV);
Use nominal value for Schottky barrier diodes (EG=0.69eV);
Specify a custom value — if you select this value, the parameter will appear Energy gap, EG, which allows you to specify a value for .

Dependencies

To use this parameter, set for the parameter Parameterization meaning Specify the energy gap, EG.

Values	`Use nominal value for silicon (EG=1.11eV)` \| `Use nominal value for 4H-SiC silicon carbide (EG=3.23eV)` \| `Use nominal value for 6H-SiC silicon carbide (EG=3.00eV)` \| `Use nominal value for germanium (EG=0.67eV)` \| `Use nominal value for gallium arsenide (EG=1.43eV)` \| `Use nominal value for selenium (EG=1.74eV)` \| `Use nominal value for Schottky barrier diodes (EG=0.69eV)` \| `Specify a custom value`
Default value	`Use nominal value for silicon (EG=1.11eV)`
Program usage name	`E_g_parameterization`
Evaluatable	No

# Energy gap, EG — the width of the forbidden zone
J | mJ | kJ | MJ | mW*hr | W*hr | kW*hr | MW*hr | eV | cal | kcal | Btu_IT

Details

Specify a custom value for the width of the restricted area.

Dependencies

To use this parameter, set for the parameter Energy gap parameterization meaning Specify a custom value.

Units	`J` \| `mJ` \| `kJ` \| `MJ` \| `mWhr` \| `Whr` \| `kWhr` \| `MWhr` \| `eV` \| `cal` \| `kcal` \| `Btu_IT`
Default value	`1.11 eV`
Program usage name	`E_g`
Evaluatable	Yes

# Saturation current temperature exponent parameterization — parameterization of the temperature index of the saturation current
Use nominal value for pn-junction diode (XTI=3) | Use nominal value for Schottky barrier diode (XTI=2) | Specify a custom value

Details

Select one of the following parameters to set the saturation current temperature value:

Use nominal value for pn-junction diode (XTI=3);
Use nominal value for Schottky barrier diode (XTI=2);
Specify a custom value — if you select this value, the parameter will appear Saturation current temperature exponent, XTI — temperature indicator of the saturation current, which allows you to set a custom value for .

Values	`Use nominal value for pn-junction diode (XTI=3)` \| `Use nominal value for Schottky barrier diode (XTI=2)` \| `Specify a custom value`
Default value	`Use nominal value for pn-junction diode (XTI=3)`
Program usage name	`XTI_parameterization`
Evaluatable	No

# Saturation current temperature exponent, XTI — temperature indicator of saturation current

Details

Specify the value for the saturation current temperature indicator .

Dependencies

To use this parameter, set for the parameter Saturation current temperature exponent parameterization meaning Specify a custom value.

Default value	`3.0`
Program usage name	`XTI`
Evaluatable	Yes

Details

Specify the temperature value at which the device operation will be simulated.

Units	`K` \| `degC` \| `degF` \| `degR` \| `deltaK` \| `deltadegC` \| `deltadegF` \| `deltadegR`
Default value	`25.0 degC`
Program usage name	`T_device`
Evaluatable	Yes

Thermal Port

# Enable thermal port — turning on the heat port

Details

Select this option to use the thermal port of the unit and simulate the effect of the generated heat and the temperature of the device.

Default value	`false (switched off)`
Program usage name	`has_thermal_port`
Evaluatable	No

# Thermal network — choosing an internal thermal model
Specify junction and case thermal parameters | Cauer model | Cauer model parameterized with Foster coefficients | External

Details

Choose an internal thermal model:

Specify junction and case thermal parameters;
Cauer model;
Cauer model parameterized with Foster coefficients;
External.

Values	`Specify junction and case thermal parameters` \| `Cauer model` \| `Cauer model parameterized with Foster coefficients` \| `External`
Default value	`Specify junction and case thermal parameters`
Program usage name	`thermal_network_parameterization`
Evaluatable	No

# Junction-case and case-ambient (or case-heatsink) thermal resistances, [R_JC R_CA] — the vector of thermal resistances
K/W

Details

Vector [R_JC R_CA] of the two values of thermal resistance. The first value R_JC — this is the thermal resistance between the junction and the housing. The second value, R_CA — this is the thermal resistance between the H port and the device body.

Dependencies

To use this parameter, set for the parameter Thermal network meaning Specify junction and case thermal parameters.

Units	`K/W`
Default value	`[0.0, 10.0] K/W`
Program usage name	`thermal_resistance_vector`
Evaluatable	Yes

# Thermal resistances, [R1 R2 ... Rn] — the vector of thermal resistances for the Kauer model
K/W

Details

Vector from the values of the thermal resistances represented by the Kauer elements in the heating network. All these values must be greater than zero.

Dependencies

To use this parameter, set for the parameter Thermal network meaning Cauer model.

Units	`K/W`
Default value	`[1.0, 3.0, 10.0] K/W`
Program usage name	`thermal_resistance_cauer_vector`
Evaluatable	Yes

# Thermal resistances, [R1 R2 ... Rn] — the vector of thermal resistances for the Foster model
K/W

Details

Vector from the values of thermal resistances represented by the coefficients of the Foster model in the heating network. All these values must be greater than zero.

Dependencies

To use this parameter, set for the parameter Thermal network meaning Cauer model parameterized with Foster coefficients.

Units	`K/W`
Default value	`[0.0016, 0.0043, 0.0013, 0.0014] K/W`
Program usage name	`thermal_resistance_foster_vector`
Evaluatable	Yes

# Thermal mass parameterization — parameterization of heat capacity
By thermal time constants | By thermal mass

Details

Choose a method for setting the heat capacity:

By thermal time constants — parameterization of heat capacity in terms of thermal time constants. This value is used by default.
By thermal mass — setting the heat capacity values.

Dependencies

To use this parameter, set for the parameter Thermal network meaning Specify junction and case thermal parameters, Cauer model or Cauer model parameterized with Foster coefficients.

Values	`By thermal time constants` \| `By thermal mass`
Default value	`By thermal time constants`
Program usage name	`thermal_mass_parameterization`
Evaluatable	No

# Junction and case thermal masses, [M_J M_C] — vector of heat capacity values for the Kauer model
J/K | kJ/K

Details

Vector [M_J M_C] of the two values of the heat capacity. The first value M_J — this is the heat capacity of the transition. The second value, M_C — this is the heat capacity of the case.

Dependencies

To use this parameter, set for the parameter Thermal network meaning Specify junction and case thermal parameters, and for the parameter Thermal mass parameterization meaning By thermal mass.

Units	`J/K` \| `kJ/K`
Default value	`[0.0, 1.0] J/K`
Program usage name	`thermal_mass_vector`
Evaluatable	Yes

# Thermal masses, [M1 M2 ... Mn] — vector of heat capacity values for the Kauer model
J/K | kJ/K

Details

Vector from values of heat capacities, where this is the number of coefficients of the Kauer model in the heat network. All these values must be greater than zero.

Dependencies

To use this parameter, set for the parameter Thermal network meaning Cauer model, and for the parameter Thermal mass parameterization meaning By thermal mass.

Units	`J/K` \| `kJ/K`
Default value	`[0.1, 0.3, 1.0] J/K`
Program usage name	`thermal_mass_cauer_vector`
Evaluatable	Yes

# Thermal masses, [M1 M2 ... Mn] — the vector of heat capacity values for the Foster model
J/K | kJ/K

Details

Vector from values of heat capacities, where this is the number of Foster elements in the heating network. All these values must be greater than zero.

Dependencies

To use this parameter, set for the parameter Thermal network meaning Cauer model parameterized with Foster coefficients, and for the parameter Thermal mass parameterization meaning By thermal mass.

Units	`J/K` \| `kJ/K`
Default value	`[4.25, 14.88, 246.15, 1428.57] J/K`
Program usage name	`thermal_mass_foster_vector`
Evaluatable	Yes

# Junction and case thermal time constants, [t_J t_C] — vector of thermal time constants
s | ns | us | ms | min | hr | d

Details

Vector [t_J t_C] of the two values of the thermal time constants. The first value t_J — this is the thermal constant of the transition time. The second value, t_C — this is the thermal time constant of the hull.

Dependencies

Units	`s` \| `ns` \| `us` \| `ms` \| `min` \| `hr` \| `d`
Default value	`[0.0, 10.0] s`
Program usage name	`thermal_time_constant_vector`
Evaluatable	Yes

# Thermal time constants, [t1 t2 ... tn] — vector of thermal time constants for the Kauer model
s | ns | us | ms | min | hr | d

Details

Vector from values of thermal time constants, where this is the number of Kauer elements in the heating network. All these values must be greater than zero.

The value of the heat capacity is calculated as , where , and — heat capacity, thermal time constant and thermal resistance for - the go element of the Cowera.

Dependencies

To use this parameter, set for the parameter Thermal network meaning Cauer model, and for the parameter Thermal mass parameterization meaning By thermal time constants.

Units	`s` \| `ns` \| `us` \| `ms` \| `min` \| `hr` \| `d`
Default value	`[1.0, 3.0, 10.0] s`
Program usage name	`thermal_time_constant_cauer_vector`
Evaluatable	Yes

# Thermal time constants, [t1 t2 ... tn] — vector of thermal time constants for the Foster model
s | ns | us | ms | min | hr | d

Details

Vector from values of thermal time constants, where this is the number of coefficients of the Foster model in the heating network. All these values must be greater than zero.

The value of the heat capacity is calculated as , where , and — heat capacity, thermal time constant and thermal resistance for - the go element of the Cowera.

Dependencies

Units	`s` \| `ns` \| `us` \| `ms` \| `min` \| `hr` \| `d`
Default value	`[0.0068, 0.064, 0.32, 2.0] s`
Program usage name	`thermal_time_constant_foster_vector`
Evaluatable	Yes

Details

Dependencies

Units	`K` \| `degC` \| `degF` \| `degR` \| `deltaK` \| `deltadegC` \| `deltadegF` \| `deltadegR`
Default value	`[25.0, 25.0] degC`
Program usage name	`T_thermal_mass_vector_start`
Evaluatable	Yes

Details

The vector of temperature values. It corresponds to the temperature difference for each heat capacity in the model.

Dependencies

To use this parameter, set for the parameter Thermal network meaning Cauer model.

Units	`K` \| `degC` \| `degF` \| `degR` \| `deltaK` \| `deltadegC` \| `deltadegF` \| `deltadegR`
Default value	`[25.0, 25.0, 25.0] degC`
Program usage name	`T_thermal_mass_cauer_vector_start`
Evaluatable	Yes

Details

The vector of absolute temperature values of each element of the Foster model.

Dependencies

To use this parameter, set for the parameter Thermal network meaning Cauer model parameterized with Foster coefficients.

Units	`K` \| `degC` \| `degF` \| `degR` \| `deltaK` \| `deltadegC` \| `deltadegF` \| `deltadegR`
Default value	`[25.0, 25.0, 25.0, 25.0] degC`
Program usage name	`T_thermal_mass_foster_vector_start`
Evaluatable	Yes