Thermistor | PartQuest™ Explore

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Description

This&nbsp;LED spotlight example demonstrates the value of simulating both the electrical and thermal&nbsp;aspects of power dissipating circuits together, simultaneously.

In this design, a Vishay NTCLE100&nbsp;Thermistor is used in a detection circuit to monitor&nbsp;the enclosure temperature. It is used for&nbsp;thermal shut-down protection, to keep the enclosure temperature well below the "Tg" (glass transition temperature) of the spotlight's Nylon 6 polymer&nbsp;lens. This is particularly helpful when operating at higher&nbsp;external ambient temperatures.

The "Thermals" (thermal dynamics) model was automatically generated from a full 3D-CFD analysis of the spotlight board layout and enclosure, using FloTHERM. The model is in the IEEE Standard VHDL-AMS format, so it can be directly imported into the SystemVision "1D" circuit and system simulation context. The ability to include an accurate model of the thermal environment is key to having&nbsp;"thermally-aware" circuit function design&nbsp;and board layout&nbsp;processes.

Copy of Analog LED Driver with Thermal Protection using FloTHERM Netlist - on Thu, 11/19/2020 - 17:33

Designer113006

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8 years 8 months

82

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Description

This&nbsp;LED spotlight example demonstrates the value of simulating both the electrical and thermal&nbsp;aspects of power dissipating circuits together, simultaneously.

In this design, a Vishay NTCLE100&nbsp;Thermistor is used in a detection circuit to monitor&nbsp;the enclosure temperature. It is used for&nbsp;thermal shut-down protection, to keep the enclosure temperature well below the "Tg" (glass transition temperature) of the spotlight's Nylon 6 polymer&nbsp;lens. This is particularly helpful when operating at higher&nbsp;external ambient temperatures.

The "Thermals" (thermal dynamics) model was automatically generated from a full 3D-CFD analysis of the spotlight board layout and enclosure, using FloTHERM. The model is in the IEEE Standard VHDL-AMS format, so it can be directly imported into the SystemVision "1D" circuit and system simulation context. The ability to include an accurate model of the thermal environment is key to having&nbsp;"thermally-aware" circuit function design&nbsp;and board layout&nbsp;processes.

TEC Sim VL

Designer236539

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4 years 11 months

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Description

This example shows the ability of a Peltier Module, or Thermo-Electric Cooler (TEC), to actively transfer heat away from a "laser" or other electronic device, during fast-changing power dissipation conditions. A thermistor, with resistance that is sensitive to temperature, is used in a Wheatstone Bridge configuration. It produces a differential voltage that is amplified by an op-amp circuit. The op-amp output voltage is approximately proportional to temperature, and 180 degrees out of phase.

The rest of the control loop is modeled here using ideal mathematical control blocks. This abstraction allows the designer to focus on the overall performance of the regulator, and to assess the choice of PID gains during actual transient operation. These gains were selected using a nominal operating point, to ensure stability of the loop at that point. This was done in the companion design https://www.systemvision.com/design/laser-temperature-regulator-tdfs. But because many of the components in this loop are non-linear in nature (e.g. the TEC, thermistor, even the op-amp with rail voltage limiting), it is good practice to use simulation to verify performance during large-signal transients.

Copy of Laser Temperature Regulator using Peltier TEC - on Sun, 11/15/2020 - 11:25

Designer236539

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4 years 11 months

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Description

This example shows the ability of a Peltier Module, or Thermo-Electric Cooler (TEC), to actively transfer heat away from a "laser" or other electronic device, during fast-changing power dissipation conditions. A thermistor, with resistance that is sensitive to temperature, is used in a Wheatstone Bridge configuration. It produces a differential voltage that is amplified by an op-amp circuit. The op-amp output voltage is approximately proportional to temperature, and 180 degrees out of phase.

The rest of the control loop is modeled here using ideal mathematical control blocks. This abstraction allows the designer to focus on the overall performance of the regulator, and to assess the choice of PID gains during actual transient operation. These gains were selected using a nominal operating point, to ensure stability of the loop at that point. This was done in the companion design https://www.systemvision.com/design/laser-temperature-regulator-tdfs. But because many of the components in this loop are non-linear in nature (e.g. the TEC, thermistor, even the op-amp with rail voltage limiting), it is good practice to use simulation to verify performance during large-signal transients.

COPYMONDAY

Designer226490

Member for

5 years 11 months

72

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Description

This&nbsp;LED spotlight example demonstrates the value of simulating both the electrical and thermal&nbsp;aspects of power dissipating circuits together, simultaneously.

In this design, a Vishay NTCLE100&nbsp;Thermistor is used in a detection circuit to monitor&nbsp;the enclosure temperature. It is used for&nbsp;thermal shut-down protection, to keep the enclosure temperature well below the "Tg" (glass transition temperature) of the spotlight's Nylon 6 polymer&nbsp;lens. This is particularly helpful when operating at higher&nbsp;external ambient temperatures.

Thermal dynamics&nbsp;models were&nbsp;automatically generated from a full 3D-CFD analysis&nbsp;using FloTHERM. This includes a thermal netlist model for the spotlight board layout and enclosure, as well as a BCI ROM model for MOSFET QFN package thermals. The format of both models is IEEE Standard VHDL-AMS, so it can be directly imported into the SystemVision "1D" circuit and system simulation context. The ability to include an accurate model of the thermal environment is key to having&nbsp;"thermally-aware" circuit function design&nbsp;and board layout&nbsp;processes.

SEMI-THERM 37 Isothermal MOSFET

Designer19

Member for

11 years 11 months

1,930

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10

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Member of the PartQuest Explore Development Team. Focused on modeling and simulation of analog, mixed-signal and multi-discipline systems covering a broad range of applications, including power electronics, controls and mechatronic systems.

Description

This&nbsp;LED spotlight example demonstrates the value of simulating both the electrical and thermal&nbsp;aspects of power dissipating circuits together, simultaneously.

In this design, a Vishay NTCLE100&nbsp;Thermistor is used in a detection circuit to monitor&nbsp;the enclosure temperature. It is used for&nbsp;thermal shut-down protection, to keep the enclosure temperature well below the "Tg" (glass transition temperature) of the spotlight's Nylon 6 polymer&nbsp;lens. This is particularly helpful when operating at higher&nbsp;external ambient temperatures.

Thermal dynamics&nbsp;models were&nbsp;automatically generated from a full 3D-CFD analysis&nbsp;using FloTHERM. This includes a thermal netlist model for the spotlight board layout and enclosure, as well as a BCI ROM model for MOSFET QFN package thermals. The format of both models is IEEE Standard VHDL-AMS, so it can be directly imported into the SystemVision "1D" circuit and system simulation context. The ability to include an accurate model of the thermal environment is key to having&nbsp;"thermally-aware" circuit function design&nbsp;and board layout&nbsp;processes.

SEMI-THERM 37 BCI ROM for LED Spotlight

Designer19

Member for

11 years 11 months

1,930

designs

10

groups

Member of the PartQuest Explore Development Team. Focused on modeling and simulation of analog, mixed-signal and multi-discipline systems covering a broad range of applications, including power electronics, controls and mechatronic systems.

Description

This&nbsp;LED spotlight example demonstrates the value of simulating both the electrical and thermal&nbsp;aspects of power dissipating circuits together, simultaneously.

In this design, a Vishay NTCLE100&nbsp;Thermistor is used in a detection circuit to monitor&nbsp;the enclosure temperature. It is used for&nbsp;thermal shut-down protection, to keep the enclosure temperature well below the "Tg" (glass transition temperature) of the spotlight's Nylon 6 polymer&nbsp;lens. This is particularly helpful when operating at higher&nbsp;external ambient temperatures.

Thermal dynamics&nbsp;models were&nbsp;automatically generated from a full 3D-CFD analysis&nbsp;using FloTHERM. This includes a thermal netlist model for the spotlight board layout and enclosure, as well as a BCI ROM model for MOSFET QFN package thermals. The format of both models is IEEE Standard VHDL-AMS, so it can be directly imported into the SystemVision "1D" circuit and system simulation context. The ability to include an accurate model of the thermal environment is key to having&nbsp;"thermally-aware" circuit function design&nbsp;and board layout&nbsp;processes.

Copy of Analog LED Driver with Thermal Protection using FloTHERM Netlist - on Fri, 10/02/2020 - 14:03

Designer229299

Member for

5 years 9 months

80

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Description

This&nbsp;LED spotlight example demonstrates the value of simulating both the electrical and thermal&nbsp;aspects of power dissipating circuits together, simultaneously.

In this design, a Vishay NTCLE100&nbsp;Thermistor is used in a detection circuit to monitor&nbsp;the enclosure temperature. It is used for&nbsp;thermal shut-down protection, to keep the enclosure temperature well below the "Tg" (glass transition temperature) of the spotlight's Nylon 6 polymer&nbsp;lens. This is particularly helpful when operating at higher&nbsp;external ambient temperatures.

The "Thermals" (thermal dynamics) model was automatically generated from a full 3D-CFD analysis of the spotlight board layout and enclosure, using FloTHERM. The model is in the IEEE Standard VHDL-AMS format, so it can be directly imported into the SystemVision "1D" circuit and system simulation context. The ability to include an accurate model of the thermal environment is key to having&nbsp;"thermally-aware" circuit function design&nbsp;and board layout&nbsp;processes.

Copy of Laser Temperature Regulator using Peltier TEC - on Fri, 09/18/2020 - 10:42

Designer219536

Member for

6 years 4 months

21

designs

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Description

This example shows the ability of a Peltier Module, or Thermo-Electric Cooler (TEC), to actively transfer heat away from a "laser" or other electronic device, during fast-changing power dissipation conditions. A thermistor, with resistance that is sensitive to temperature, is used in a Wheatstone Bridge configuration. It produces a differential voltage that is amplified by an op-amp circuit. The op-amp output voltage is approximately proportional to temperature, and 180 degrees out of phase.

The rest of the control loop is modeled here using ideal mathematical control blocks. This abstraction allows the designer to focus on the overall performance of the regulator, and to assess the choice of PID gains during actual transient operation. These gains were selected using a nominal operating point, to ensure stability of the loop at that point. This was done in the companion design https://www.systemvision.com/design/laser-temperature-regulator-tdfs. But because many of the components in this loop are non-linear in nature (e.g. the TEC, thermistor, even the op-amp with rail voltage limiting), it is good practice to use simulation to verify performance during large-signal transients.