7/27/2019 Power Factor Correction Step by Step Guide

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Power Factor Correction Step-by-Step Guide

Start your design by deciding the power supply topology.

The power train discrete device power loss and efficiency analysis tools include support for MOSFETs, IGBTs, and

rectifiers in the power factor correction or phase-shifted full-bridge plus synchronous rectification topologies. For

this step-by-step example, well design a Power Factor Correction (PFC) power train with the following

requirements:

Step 1

Input specifications:

85 Vac to 265 Vac 50 Hz line frequency

Output specifications:

387 VDC 350 W 65 kHz operating frequency

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Enter Design Requirements

Step 1 establishes system, component de-rating, and thermal requirements. Simply entering the system AC Inputs

(step 1a) and DC Output (step 1b) will dynamically refresh Recommended and Calculated values within Operating

Conditions (step 1c), Maximum Junction Temperature and Voltage De-rating (step 1d) sections. For example, the

PFC Switching Frequency and Boost Inductor Inductance values will reflect the AC input and DC output design

requirements. PFC Operating Mode selection will also influence the Recommended and Calculated values.

(Step 1d) Thermal and mechanical adjustments can improve the power dissipation capability of the power discrete

(MOSFET, IGBT, rectifier) devices. This includes mechanical heat sink temperature and thermal interface

requirements to the power discrete devices.

Step 1

Click here

(orange arrow

once design

requirements

are entered.

Calculated Value

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Semiconductor Selection

From the inputs in Step 1, Step 2 recommends and helps visualize the Junction temperature and Power dissipationof the power discrete (MOSFET, IGBT, rectifier) devices. Further selection change to the power discrete device(s),

line - AC input (Vac), and/or load - Output Power, dynamically updates the Junction temperature and Power

dissipation of the power discrete devices.

Input voltage (Vac) and output power can be manipulated by entering the value in the box, or moving the bar from

left (min) to right (max).

Step 2

Navigate within

the design tool by

using or

selecting from this

lefthand column.

Junction temperature ( C)

Power dissipation (W)

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Selection changes to Step 2a automatically affect selection to Step 2b due to PFC Switch (MOSFET/IGBT) and boost

diode interaction.

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SummaryWhat is next? Download the design or save it online for later. Move quickly to prototyping. Its quick and easy!

Step 3

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