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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. 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 Mon, 08/17/2020 - 07:14

Designer226490

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5 years 11 months

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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. 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 Mon, 08/17/2020 - 07:14

Designer226490

Member for

5 years 11 months

designs

groups

Add a bio to your profile to share information about yourself with other SystemVision users.

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. 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 Mon, 08/17/2020 - 07:14

Designer226490

Member for

5 years 11 months

designs

groups

Add a bio to your profile to share information about yourself with other SystemVision users.

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. 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 Mon, 08/17/2020 - 07:14

Designer226490

Member for

5 years 11 months

designs

groups

Add a bio to your profile to share information about yourself with other SystemVision users.

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. 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 Mon, 08/17/2020 - 07:14

Designer226490

Member for

5 years 11 months

designs

groups

Add a bio to your profile to share information about yourself with other SystemVision users.

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. 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 Mon, 08/17/2020 - 07:14

Designer226490

Member for

5 years 11 months

designs

groups

Add a bio to your profile to share information about yourself with other SystemVision users.

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. 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.

Lug initialization problem

Designer19

Member for

11 years 11 months

1,927

designs

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.

The "Thermals" (thermal dynamics) model was automatically generated from a full 3D-CFD analysis of the spotlight board layout and enclosure. 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.

Analog LED Driver with Thermal Protection using FloTHERM Netlist

Designer19

Member for

11 years 11 months

1,927

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.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 LED Dimmer Circuit using 555 Timer - on Thu, 08/06/2020 - 15:40

Designer233699

Member for

5 years 2 months

0

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Description

This LED Dimmer Circuit uses a 555 Timer to control the PWM duty cycle of the current drive. Rather than apply proportional but continuous current to the LED for dimming, which can cause color shifts, modulating the duty cycle allows the LED to operate at its nominal current during the “ON” portion of the cycle. Because the frequency response of human vision is limited, using a PWM frequency of 250 Hz avoids the perception of flicker for the observer.

The LED model has an internal monitor for the "perceived" light output (light-blue waveform), which is a low-pass filtered version of the instantaneous light output. The filter pole frequency is set to 15 Hz to represent the bandwidth of the human eye. The value of the dimmer setting (green waveform) is increased from 10% to 90% at time 100msec. The LED current pulses (purple waveform) are shown just before and after the duty-cycle transition.

Part of this design is based on a dimmer schematic found on-line:

http://www.555-timer-circuits.com/led-dimmer.html

That original circuit is actually incorrect, one of the diodes needs to be reversed. There was a comment from a reader who said he built the circuit as shown and it didn’t work. This is a good example of the value of simulating circuits before building hardware!