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"analog" <analog@ieee.org> wrote in message
news:4070615F.181E549B@ieee.org...
| Hi all,
|
| A circuit simulator oriented toward switching power conversion cannot
| be considered complete without a non linear inductor model as part of
| the package. This is absolutely vital for simulating the mundane such
| as variations in core loss with operating conditions as well as the
| more exotic such as magamps and ferroresonant transformers.
|
| Toward this end I have recently been amusing myself trying to create
| a good non linear inductor model for LTspice. As with other similar
| models, it integrates inductor voltage and applies it to a bi-
| directional zener like impedance to model saturation. In addition it
| may have the following new(?) and useful features:
|
| + True dc and ac hysteresis effects
| + Options for modeling both round and square loop materials
| (using fast LTspice specific features)
| + A simple way of modeling the addition of a core gap
| + Adjustable frequency dependent losses
|
| Although the qualitative results of this model have a satisfying
| look and feel about them, the model is preliminary and has not been
| quantitatively verified. Also, I'm not sure what the friendliest
| parameter format to present to the user would be (how best to
| relate core and material parameters to input terminal parameters).
| Should turns and core geometry be part of the model so that the
| internal nodes proportional to B and H could be scaled and related
| to material parameters (and be made available as outputs)?
|
| Ideas, comments? -- analog
|
Nice...... I did this once as a rip off from something downloaded from
Intusoft. Very much simpler though and looking at yours tells me what a
novice I am when it comes to Spice.
One thing I did do, which may be of interest, is instead of using diodes
to model saturation I used parallel inverse voltage controlled switches
with what in LTspice would be negative hysteresis for a smooth
logaritmic transition(?)
Setting the threshold would set the saturation level. Setting the
hysteresis would determine the sharpness of saturation. It might be
intuitively better than using diodes.
DNA
news:4070615F.181E549B@ieee.org...
| Hi all,
|
| A circuit simulator oriented toward switching power conversion cannot
| be considered complete without a non linear inductor model as part of
| the package. This is absolutely vital for simulating the mundane such
| as variations in core loss with operating conditions as well as the
| more exotic such as magamps and ferroresonant transformers.
|
| Toward this end I have recently been amusing myself trying to create
| a good non linear inductor model for LTspice. As with other similar
| models, it integrates inductor voltage and applies it to a bi-
| directional zener like impedance to model saturation. In addition it
| may have the following new(?) and useful features:
|
| + True dc and ac hysteresis effects
| + Options for modeling both round and square loop materials
| (using fast LTspice specific features)
| + A simple way of modeling the addition of a core gap
| + Adjustable frequency dependent losses
|
| Although the qualitative results of this model have a satisfying
| look and feel about them, the model is preliminary and has not been
| quantitatively verified. Also, I'm not sure what the friendliest
| parameter format to present to the user would be (how best to
| relate core and material parameters to input terminal parameters).
| Should turns and core geometry be part of the model so that the
| internal nodes proportional to B and H could be scaled and related
| to material parameters (and be made available as outputs)?
|
| Ideas, comments? -- analog
|
Nice...... I did this once as a rip off from something downloaded from
Intusoft. Very much simpler though and looking at yours tells me what a
novice I am when it comes to Spice.
One thing I did do, which may be of interest, is instead of using diodes
to model saturation I used parallel inverse voltage controlled switches
with what in LTspice would be negative hysteresis for a smooth
logaritmic transition(?)
Setting the threshold would set the saturation level. Setting the
hysteresis would determine the sharpness of saturation. It might be
intuitively better than using diodes.
DNA
