DC/DC Converter (LTspice Model)

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DC/DC Converter
Simplified SPICE Behavioral Model
for LTspice Model

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DC/DC Converter (LTspice Model)

  1. 1. DC/DC Converter Simplified SPICE Behavioral Model All Rights Reserved Copyright (C) Bee Technologies Corporation 2010
  2. 2. Contents <ul><li>Model Overview </li></ul><ul><li>Benefit of the Model </li></ul><ul><li>Concept of the Model </li></ul><ul><li>DC/DC Specification (Example) </li></ul><ul><li>Input-Output Characteristics </li></ul><ul><li>Simulation Circuit and Setting </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2010
  3. 3. 1.Model Overview <ul><li>This DC/DC Converter Simplified SPICE Behavioral Model is for users who require the model of a converter as a part of their system. </li></ul><ul><li>The model focuses on the input/output relationships of the converter block; therefore, it is not using high frequency models (e.g. oscillator and noise models), and is not based on the electronic topologies of the converter. </li></ul><ul><li>The model enables long-term behavior simulation of the system (e.g. in a Photovoltaic system simulation), which is increased simulation speed more than 100 times compared to a cycle-to-cycle model. </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2010
  4. 4. 2.Benefit of the Model <ul><li>Enable Transient and DC Sweep Simulation. </li></ul><ul><li>Can be adjusted to your own DC/DC specifications, step-up or step-down, by editing the model parameters. </li></ul><ul><li>The simplified model is an easy-to-use, which can be provided without the circuit detail. </li></ul><ul><li>Time and costs are saved because only the necessary parts are simulated. </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2010
  5. 5. 3.Concept of the Model <ul><li>The model is characterized by parameters n, Vo, Vin_min, and Vin_max, that represent the input-output-relationships of the converter. </li></ul><ul><li>DC/DC Converter Simplified SPICE Behavioral Model </li></ul><ul><li>Efficiency (n) = P OUT / P IN </li></ul><ul><ul><li> = V OUT  I OUT / V IN  I IN </li></ul></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2010 IN+ IN- OUT+ OUT- V IN,MIN ~V IN,MAX (Vdc) V OUT (Vdc) I IN I OUT
  6. 6. 4.DC/DC Specification (Example) <ul><li>DC/DC Converter with V IN =250~425Vdc, V OUT =12Vdc, and Efficiency=84% </li></ul><ul><li>DC/DC Converter </li></ul><ul><li>Efficiency (n) = 84.2% </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2010 IN+ IN- OUT+ OUT- Operating Input Voltage: V IN,MIN =250 ~ V IN,MAX =425(Vdc) V OUT =12(Vdc)
  7. 7. 5.Input-Output Characteristics <ul><li>Output voltage and efficiency of the converter when sweep the input voltage. </li></ul>All Rights Reserved Copyright (C) Bee Technologies Corporation 2010 Efficiency (n) = 84% V OUT =12Vdc V O decreases as V IN < V IN ,MIN
  8. 8. 6.Simulation Circuit and Setting All Rights Reserved Copyright (C) Bee Technologies Corporation 2010 <ul><li>Please do copy/paste </li></ul><ul><li>LTspice symbols files to C:Program FilesLTCLTspiceIVlibsym </li></ul><ul><li>LIB files to C:Program FilesLTCLTspiceIVlibsub </li></ul>
  9. 9. 6.Simulation Circuit and Setting <ul><li>To show the simulation results with the same format (plots and axis scales) to this manual, please select Waveforms window then select Plot Setting > Reload Plot Setting after the simulation finished running. </li></ul>select Waveforms window select Reload Plot Settings All Rights Reserved Copyright (C) Bee Technologies Corporation 2010

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