How can I simulate an NTC on LTspice?
Rtherm1 is the way I prefer to test circuits with NTC’s you can set a range of resistance values by looking at a table ( a high and low value) and then run a simulation with the values ramping between high and low. Thanks for contributing an answer to Electrical Engineering Stack Exchange!
How is LTspice used to simulate a transformer?
LTspice simulates the transformer using individual component values, in this case, the inductance of the individual inductors, not the turns ratio of the transformer. The inductance ratio corresponds to the turns ratio as follows: For example, for a 1:3 and 1:2 turns ratios, enter inductance values to produce a one to nine and one to four ratios:
How many K statements are needed for LTspice?
Only a single K statement is needed per transformer; LTspice applies a single coupling coefficient to all inductors within a transformer. The following is an equivalent to the statement above:
Which is the correct coupling coefficient for LTspice?
For practical circuits, it is recommended you start with a coupling coefficient of 1. Only a single K statement is needed per transformer; LTspice applies a single coupling coefficient to all inductors within a transformer. The following is an equivalent to the statement above:
How does the NTC thermistor model sense the current?
In its place, simply sense the current I and generate the voltage V = I x R with a voltage source. Here’s a subcircuit that models a 10k resistor. To sense current, SPICE uses a voltage source VSENSE (0V). It’s set to 0V so there’s no effect on the output voltage.
What does the PWL statement in NTC thermistor mean?
It contains a Piece-Wise-Linear (PWL) statement that creates a voltage ramping linearly from -15V at 0 ms to 65 V at 100ms. Although it’s a voltage, we know it represents temperature. We’ll even throw in the DEG units in the PWL statement, just as a reminder, which SPICE ignores anyway.
How is the current sensed by the Spice?
To sense current, SPICE uses a voltage source VSENSE (0V). It’s set to 0V so there’s no effect on the output voltage. The other source, ERES, generates the voltage across the “resistor” based on the sensed current times your desired resistance: VALUE= { I (VSENSE)* 10K }.