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This is Bryce's implementation of the model reported by Mombello and Moller, "New power transformer model for the calculation of electromagnetic

resonant transient phenomena including frequency-dependent losses"

IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 15, NO. 1, JANUARY 2000, pp. 167-174.

The model adds a series of auxiliary windindgs to capture frequency-dependent variations in leakage inductance and winding resistance due to proximity effects and skin effects. Mombello also includes winding capacitance.

Models are generating by fitting response waveforms to measurements. This allows the model topology to realize virtually any high frequency effect. The alternative apporach, exemplified by Dowell, derives a set of equations from the structure of the windings. Its advantage is that it can be simulated prior to fabrication. The disadvantage of the alternative model is that the derivation tends to require simplifying assunptions that restrict the use of the model.

Mombello-Moller Transformer Model Verification

Norm
Designer43361

Norm

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8 years

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Description

In "New power transformer model for the calculation of electromagnetic resonant transient phenomena including frequency-dependent losses"

(<a href="https://ieeexplore.ieee.org/document/891529/keywords">https://ieeexplore.ieee.org/document/891529/keywords</a>),

Mombello and Moller present an equivalent circuit that accurately models proximity and skin effects. I have implemented their model in VHDL_AMS. The model is characterized by a set of 17 model parameters whose values can be derived from driving point impedance measurements. The four sets of measurements required are replicated in this simulation design so that the simulation results can be compared to the measurements. That comparison serves to verify the model before it is used to simulate a product design.

I have programmed Excel to generate a set of model parameters from measurements of a physical transformer. Parameter values can be transfered from the spreadsheet to the schematic by the following steps:

<ol><li>Select and copy the full set of parameters from the spreadsheet.</li>
	<li>On this page, open the property editor once for each transformer in the design.</li>
	<li>Select any cell in the column of xfrmr_model entries and click to enter the values copied from the spreadsheet.</li>
	<li>Repeat for all four transformers in the design.</li>
</ol>Model verification is based on frequency_domain simulation. The spreadsheet provides an option to match the frequencies to the measured data. To activate this option, press the "Sim Control" button on the spreadsheet. Return to SystemVision and open the Simulation Settings menu by clicking the gear-shaped icon. Click the Advanced Options bar, then paste into the "Manual Options" window. A list of simulation frequencies should appear, prepended by the Spice directive ".AC list ". Once the simulation is complete, results can be exported to the email utility by first selecting each of the two waveform views and activating the "Download Waveforms" option. This will produce a pair of .csv files, whiich can be opened in the spreadsheet and applied to the comparison against measurements.

Mombello-Moller Transformer Model Verification

Norm
Designer43361

Norm

Member for

8 years

designs

groups

Description

In "New power transformer model for the calculation of electromagnetic resonant transient phenomena including frequency-dependent losses"

(<a href="https://ieeexplore.ieee.org/document/891529/keywords">https://ieeexplore.ieee.org/document/891529/keywords</a>),

Mombello and Moller present an equivalent circuit that accurately models proximity and skin effects. I have implemented their model in VHDL_AMS. The model is characterized by a set of 17 model parameters whose values can be derived from driving point impedance measurements. The four sets of measurements required are replicated in this simulation design so that the simulation results can be compared to the measurements. That comparison serves to verify the model before it is used to simulate a product design.

I have programmed Excel to generate a set of model parameters from measurements of a physical transformer. Parameter values can be transfered from the spreadsheet to the schematic by the following steps:

<ol>
	<li>Select and copy the full set of parameters from the spreadsheet.</li>
	<li>On this page, open the property editor once for each transformer in the design.</li>
	<li>Select any cell in the column of xfrmr_model entries and click to enter the values copied from the spreadsheet.</li>
	<li>Repeat for all four transformers in the design.</li>
</ol>

Model verification is based on frequency_domain simulation. The spreadsheet provides an option to match the frequencies to the measured data. To activate this option, press the "Sim Control" button on the spreadsheet. Return to SystemVision and open the Simulation Settings menu by clicking the gear-shaped icon. Click the Advanced Options bar, then paste into the "Manual Options" window. A list of simulation frequencies should appear, prepended by the Spice directive ".AC list ". Once the simulation is complete, results can be exported to the email utility by first selecting each of the two waveform views and activating the "Download Waveforms" option. This will produce a pair of .csv files, whiich can be opened in the spreadsheet and applied to the comparison against measurements.

Copy of Norm's version of Bryce Hesterman's Mutual Impedance Transformer Model - on Wed, 03/18/2020 - 11:27

Norm
Designer43361

Norm

Member for

8 years

designs

groups

Description

This is Bryce's implementation of the model reported by Mombello and Moller, "New power transformer model for the calculation of electromagnetic

resonant transient phenomena including frequency-dependent losses"

IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 15, NO. 1, JANUARY 2000, pp. 167-174.

The model adds a series of auxiliary windindgs to capture frequency-dependent variations in leakage inductance and winding resistance due to proximity effects and skin effects. Mombello also includes winding capacitance.

Models are generating by fitting response waveforms to measurements. This allows the model topology to realize virtually any high frequency effect. The alternative apporach, exemplified by Dowell, derives a set of equations from the structure of the windings. Its advantage is that it can be simulated prior to fabrication. The disadvantage of the alternative model is that the derivation tends to require simplifying assunptions that restrict the use of the model.

Copy of Bryce Hesterman's Mutual Impedance Transformer Model - on Wed, 02/19/2020 - 22:26

Bryce Hesterman
Designer16966

Bryce Hesterman

Member for

8 years 3 months

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Description

This is Bryce's implementation of the model reported by Mombello and Moller, "New power transformer model for the calculation of electromagnetic

resonant transient phenomena including frequency-dependent losses"

IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 15, NO. 1, JANUARY 2000, pp. 167-174.

The model adds a series of auxiliary windindgs to capture frequency-dependent variations in leakage inductance and winding resistance due to proximity effects and skin effects. Mombello also includes winding capacitance.

Models are generating by fitting response waveforms to measurements. This allows the model topology to realize virtually any high frequency effect. The alternative apporach, exemplified by Dowell, derives a set of equations from the structure of the windings. Its advantage is that it can be simulated prior to fabrication. The disadvantage of the alternative model is that the derivation tends to require simplifying assunptions that restrict the use of the model.

Copy of Bryce Hesterman's Mutual Impedance Transformer Model - on Wed, 02/19/2020 - 22:22

Bryce Hesterman
Designer16966

Bryce Hesterman

Member for

8 years 3 months

designs

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

Description

This is Bryce's implementation of the model reported by Mombello and Moller, "New power transformer model for the calculation of electromagnetic

resonant transient phenomena including frequency-dependent losses"

IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 15, NO. 1, JANUARY 2000, pp. 167-174.

The model adds a series of auxiliary windindgs to capture frequency-dependent variations in leakage inductance and winding resistance due to proximity effects and skin effects. Mombello also includes winding capacitance.

Models are generating by fitting response waveforms to measurements. This allows the model topology to realize virtually any high frequency effect. The alternative apporach, exemplified by Dowell, derives a set of equations from the structure of the windings. Its advantage is that it can be simulated prior to fabrication. The disadvantage of the alternative model is that the derivation tends to require simplifying assunptions that restrict the use of the model.

Primary Leakage

Bryce Hesterman
Designer16966

Bryce Hesterman

Member for

8 years 3 months

designs

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

Description

This is Bryce's implementation of the model reported by Mombello and Moller, "New power transformer model for the calculation of electromagnetic

resonant transient phenomena including frequency-dependent losses"

IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 15, NO. 1, JANUARY 2000, pp. 167-174.

The model adds a series of auxiliary windindgs to capture frequency-dependent variations in leakage inductance and winding resistance due to proximity effects and skin effects. Mombello also includes winding capacitance.

Models are generating by fitting response waveforms to measurements. This allows the model topology to realize virtually any high frequency effect. The alternative apporach, exemplified by Dowell, derives a set of equations from the structure of the windings. Its advantage is that it can be simulated prior to fabrication. The disadvantage of the alternative model is that the derivation tends to require simplifying assunptions that restrict the use of the model.

Copy of Bryce Hesterman's Mutual Impedance Transformer Model - on Tue, 02/18/2020 - 11:10

Bryce Hesterman
Designer16966

Bryce Hesterman

Member for

8 years 3 months

designs

groups

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

Description

This is Bryce's implementation of the model reported by Mombello and Moller, "New power transformer model for the calculation of electromagnetic

resonant transient phenomena including frequency-dependent losses"

IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 15, NO. 1, JANUARY 2000, pp. 167-174.

The model adds a series of auxiliary windindgs to capture frequency-dependent variations in leakage inductance and winding resistance due to proximity effects and skin effects. Mombello also includes winding capacitance.

Models are generating by fitting response waveforms to measurements. This allows the model topology to realize virtually any high frequency effect. The alternative apporach, exemplified by Dowell, derives a set of equations from the structure of the windings. Its advantage is that it can be simulated prior to fabrication. The disadvantage of the alternative model is that the derivation tends to require simplifying assunptions that restrict the use of the model.

Copy of Bryce Hesterman's Mutual Impedance Transformer Model - on Tue, 02/18/2020 - 11:07

Bryce Hesterman
Designer16966

Bryce Hesterman

Member for

8 years 3 months

designs

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

Description

This is Bryce's implementation of the model reported by Mombello and Moller, "New power transformer model for the calculation of electromagneticresonant transient phenomena including frequency-dependent losses"IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 15, NO. 1, JANUARY 2000, pp. 167-174.The model adds a series of auxiliary windindgs to capture frequency-dependent variations in leakage inductance and winding resistance due to proximity effects and skin effects. Mombello also includes winding capacitance.Models are generating by fitting response waveforms to measurements. This allows the model topology to realize virtually any high frequency effect. The alternative apporach, exemplified by Dowell, derives a set of equations from the structure of the windings. Its advantage is that it can be simulated prior to fabrication. The disadvantage of the alternative model is that the derivation tends to require simplifying assunptions that restrict the use of the model.

Mombello-Moller Transformer Model

Norm
Designer43361

Norm

Member for

8 years

designs

groups

Description

In "New power transformer model for the calculation of electromagnetic resonant transient phenomena including frequency-dependent losses" (<a href="https://ieeexplore.ieee.org/document/891529/keywords">https://ieeexplore.ieee.org/document/891529/keywords</a>), Mombello and Moller present an equivalent circuit that accurately models proximity and skin effects.

This design compares that model to the conventional T model for the two cases of open and short crcuit secondary windings. The specific model tested is a slightly simplified version that excludes winding capacitance. The model description and parameters were provided in a private communication by Bryce Hesterman of Utah State University along with measurements for comparison. Except for the absence of winding capacitance, the model reproduces the measurements faithfully. That comparison is documented separately in an Excel workbook.

The Mombello-Moller models are identified in the schematic by a label marked "Mutual Z", Winding inductance is computed by continuous function blocks added into the schematic.

Along with the measurements, Bryce has presented the following description of the two winding transformer:

Winding 1:

- 64 turns of #19 wire

- two layers separated by...

- ...one layer of 3M #44

-  A jumper connects the two layers 
Winding 2:

- 94 turns of #23 wire

- two layers (as above).

All winding layers wound in the same direction

===================================

Detailed results are documented separately..