Narrow down by specifying conditions
現在1888件がヒットしています。check
Among the components prepared in LTspice, various parts other than Analog Devices products are prepared.
Among them, we will introduce the ISO voltage model source that can be used for the simulation of the transient electrical conduction disturbance test of the automotive ECU (Electronic Control Unit) power supply line.
If you are just starting LTspice, we recommend that you look at the "basics" from the list below.
Let's use LTspice series list is here
Also, if you would like to see a video on how to write a basic circuit and how to execute it, there is an on-demand seminar that does not require you to enter personal information, so please take a look if you are interested. Detailed information about the seminar is also provided to those who fill in the questionnaire.
LTspice On-Demand Seminar - Function check with RC circuit -
What is a power line transient electrical disturbance test?
In-vehicle ECUs must be tested for abnormalities when surges or overvoltages enter the power supply line during operation, or when the power supply voltage becomes unstable due to cold crank.
Such test methods are specified in ISO7673-2/ISO16750-2 as power line surge tests and power supply voltage fluctuation test requirements.
What if I'm not using the ISO model?
As an international standard, a transient electrical disturbance test has been established. However, in reality, I think that each manufacturer conducts tests by making some changes based on the ISO model.
It is also possible to change the test conditions for the ISO model prepared by LTspice.
There are files "ISO16750-2.lib" and "ISO7637-2.lib" in the following folder, and it is possible to add and change test conditions by changing these library files.
C:\Users\username\Documents\LTspiceXVII\lib\sub
If you open each library file with a text editor or LTspice, you will find the following contents. The description starting with .subckt is Spice model of each Pulse.
Create, save and use custom conditions as needed.
Operation check of ISO-7637-2 model
Select a component from the toolbar. Select and place ISO-7637-2 from the list.
Select the 12V condition for Pulse 2a in ISO-7637-2.
Place a 1KΩ resistor and configure the following circuit for transient analysis.
Set the simulation time to 0.3 sec.
The schematic and simulation results are shown below.
About the contents of the model
a) ISO7637-2
ISO7637-2 has 12V and 24V conditions, and has five provisions called Pulse 1, 2a, 2b, 3a, and 3b respectively.
To switch conditions on LTspice, right-click on the model to open the "Component Attribute Editor".
By clicking the Value part of SpiceModel in the editor menu, you can select each Pulse condition as shown in the figure.
b)ISO16750-2
ISO16750-2 has the following nine provisions.
・4-4: Superimposed Alternating Voltage
・4-5: Slow Decrease and Increase Supply Voltage
・4-6-1: Discontinuities in Supply Voltage (Momentary supply voltage)
・4-6-2: Reset Behavior at Drop Voltage
・4-6-3: Starting Profile
・4-6-4: Load Dump Without Centralized Load Dump Suppression (TestA)
・4-6-4: Load Dump With Centralized Load Dump Suppression (TestB)
・4-7: Reversed Voltage
・4-9-1: Single Line Interruption
For ISO16750-2 conditions, right-click on the model to open the "Component Attribute Editor".
By clicking the Value part of SpiceModel in the editor menu, you can select each Pulse condition as shown in the figure.
We hope that you will use the ISO model introduced this time to consider surge stoppers and ideal diode products from Analog Devices.
A more detailed technical article is also available on the Analog Devices page. Please check from the link below.
Also, if you want to know more about ISO standards, please check from the link below.
Click here for recommended articles/materials
List of articles: Let's use LTspice Series
LTspice FAQ: FAQ list
List of technical articles: technical articles
Manufacturer introduction page: Analog Devices, Inc.
Click here for recommended seminars/workshops
Inquiry
If you have any questions regarding this article, please contact us below.
Analog Devices Manufacturer Information Top
If you want to go back to Analog Devices Manufacturer Information Top, please click below.
