DC Power Supply Simplified SPICE Behavioral Model

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Contents

1. Model Overview

2. Benefit of the Model

3. Concept of the Model

4. DC Power Supply Specification (Example)

5. Parameter Settings

6. Operation Area Characteristics6.1 Simulation Circuit and Setting

7. Rated Output Voltage Characteristics7.1 Simulation Circuit and Setting

Library Files and Symbol Files Location

Simulation Index

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1. Model Overview

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• This DC Power Supply Simplified SPICE Behavioral Model is for users who require the model of a DC power supply as a part of their system.

• The model focuses on the power supply’s behavior in their operation area, which user can input rated voltage, rated power, and maximum output current.

Rated output voltage

Rated output line (from Rated Power)

Output Voltage [V]

Output Current [A]

Operation Area Maximum output current

2. Benefit of the Model

• Can be easily adjusted to your own DC power supply specifications

by editing the model parameters.

• The simplified model is an easy-to-use, which can be provided

without the circuit detail.

• Time and costs are saved because only the necessary parts are

simulated.

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3. Concept of the Model

The model is characterized by parameters: VMAX, POWER (for PRATED), VOUT and IMAX, which represent the output voltage vs. output current characteristics of the power supply.

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DC Power SupplySimplified SPICE Behavioral Model

[Spec: PRATED, VMAX, IMAX]

Adjustable VOUT ( VMAX)

+

-

Load Current

VOUT

4.DC Power Supply Specification (Example)

DC Power Supply with•POWER = 1600W, VMAX = 80Vdc, and IMAX = 160Adc•VOUT is adjustable between 0 to 80V (VMAX)

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+

-

Load Current

VOUT

DC Power SupplySimplified SPICE Behavioral Model

[Spec: PRATED, VMAX, IMAX]

Adjustable VOUT ( VMAX)

5. Parameter Settings (Example)

POWER Rated power– e.g. 400W, 800W, 1600W– Value = <POWER>

VMAX DC maximum output voltage

– e.g. 80V, 320V, 650V– Value = <VMAX>

IMAX DC maximum output current

– e.g. 40A, 80A, 160A– Value = <IMAX>

VOUT Output voltage

– 0 ~ VMAX

– Value = <VOUT>

• From the DC power supply specification, the model is characterized by setting parameters POWER, VMAX, and IMAX, then input VOUT value (from 0 to VMAX).

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Model Parameters:

6. Operation Area Characteristics

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Rated output voltage

Maximum output current

Rated output line

Rated operation range

6.1 Simulation Circuit and Setting

*Analysis directives: .DC LIN ILOAD 0 200 10m .PROBE V(*) I(*) W(*) D(*) NOISE(*)

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DC Sweep: ILOAD0-200A

DC Sweep: ILOAD0-200A

7. Rated Output Voltage Characteristics

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Parameter VOUT = 40V

60V

80V, and 100V

V(OUT) is limited by the model parameter VMAX (80V)V(OUT) is limited by the model parameter VMAX (80V)

7.1 Simulation Circuit and Setting

*Analysis directives: .TRAN 0 10m 0 10u .STEP PARAM OUTPUT list 40 60 80 100.PROBE V(*) I(*) W(*) D(*) NOISE(*)

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Open LoadOpen Load

Sweep VOUT with 40, 60, 80, and 100 V

Sweep VOUT with 40, 60, 80, and 100 V

Library Files and Symbol Files Location

1) Copy LIB files from CD to C:\Program Files\LTC\LTspiceIV\lib\sub

2) Copy LTspice symbols files from CD to C:\Program Files\LTC\LTspiceIV\lib\sym

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.SUB

.ASY

Simulation Index

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Simulations Folder name

1. Operation Area

Characteristic.......................................

2. Rated Output Voltage

Characteristic.............................

Operation Area

Rated Voltage