TIDA-00181

Isolated IGBT Gate-Drive Push-Pull Power Supply with 4 Outputs

TIDA-00181

Design files

Overview

This reference design provides isolated positive and negative voltage rails required for Insulated Gate Bipolar Transistor (IGBT) gate drivers from a single 24-volt DC input supply. IGBTs are used in three phase inverters for variable-frequency drives to control the speed of AC motors. This reference design uses a push-pull isolated control topology and provides isolation compliant to IEC61800-5 and is intended to operate from a pre-regulated 24Vdc input.

With a regulated (within 5%) input source, a simple open-loop, free-running oscillator can be implemented with a push-pull PWM controller. This topology is essentially a forward converter with two primary windings used to create a dual-drive winding. This fully utilizes the transformer core's magnetizing current more efficiently than flyback or the forward topologies. Another advantage this configuration has over flyback and forward configurations is that the supply output can be scaled up for higher power drives.

This reference design also takes advantage of another benefit of the push pull topology in that multiple transformers can be controlled in parallel from a single controller to generate all the isolated voltage rails required for 3-phase IGBT inverters.

Lastly, larger IGBTs for higher power drives sometimes require more gate drive current than what is provided by a typical IGBT gate driver, for which designers often use additional transistors for gate current boosting. This reference design provides +16V on the positive outputs and -8V on the negative outputs to compensate for the added voltage drop in those transistors.

Features
  • Supports 6 IGBT Gate Drivers for 3 arms of inverter (Each arm in half-bridge configuration)
  • Push-pull topology enables parallel transformer stages from a single controller for 3-phase power
  • Operates with pre-regulated 24V input
  • Two reinforced isolated, low-ripple (<200mV) outputs for each IGBT: +16V (x2) & -8V (x2)
  • Output power: 2W per IGBT and scalable to support higher power IGBTs   
  • Option to shut down the power supply to facilitate Safe Torque Off (STO) feature
  • Output capacitors rated to support up to 6A peak gate drive current
  • Designed to meet IEC61800-5

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU355A.PDF (6637 K)

Reference design overview and verified performance test data

TIDR779.PDF (380 K)

Detailed schematic diagram for design layout and components

TIDR790.PDF (220 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDR780.ZIP (283 K)

Detailed overview of design layout for component placement

TIDR781.ZIP (1692 K)

Detailed overview of design layout for component placement

TIDR782.ZIP (2851 K)

Files used for 3D models or 2D drawings of IC components

Products

Includes TI products in the design and potential alternatives.

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Load switches

TPS27082L8-V, 3-A, 44-mΩ load switch with adj. rise time and hysteresis

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PWM controllers

LM5030100-V push-pull current mode PWM controller

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Technical documentation

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Type Title Date
* Design guide Isolated IGBT Gate-Drive Push-Pull Power Supply With 4 Outputs (Rev. A) Jun. 20, 2016
White paper Power Electronics in Motor Drives: Where is it? (Rev. A) Oct. 01, 2019
Application note Analysis of Power Supply Topologies for IGBT Gate Drivers in Industrial Drives Jul. 06, 2015
Application note Is Your IGBT Gate-Driver Power Supply Optimized Mar. 12, 2015

Related design resources

Reference designs

REFERENCE DESIGN
TIDA-00182 Reinforced Isolated IGBT Gate Drive Flyback Power Supply with 8 Outputs Reference Design TIDA-00199 Wide-Input Isolated IGBT Gate-Drive Fly-Buck Power Supply for Three-Phase Inverters Reference Design

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