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. Utilizing a Fly-Buck™ control topology, this reference design uses a single transformer for generating power rails for all three arms of the 3-phase inverter. It uses primary-side regulation and can achieve good cross regulation without opto-coupler feedback or an auxiliary winding. The isolated outputs are generated through the coupled windings of the transformer. The voltage rails for all the high-side IGBTs are individually isolated, whereas the voltage rails for all low-side IGBTs are combined.
• Isolated power supply with 24V±20% input range that supports 6 IGBT gate drivers for 3-phase inverter (each arm in half-bridge configuration)
• Low-ripple (<200mV) bias outputs (+15V & -8V) with output power of 2.3W for each IGBT of the 3-phase inverter
• Fly-Buck topology provides easy-to-design multi-output isolated power supply solution with primary side regulation
• Peak efficiency of 82% at balanced full-load
• Output capacitors rated to support up to 6A peak gate drive current
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
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Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | User guide | Wide-Input Isolated IGBT Gate-Drive Fly-Buck Pwr Supply for 3-Phase Inverters (Rev. A) | Jan. 27, 2015 | |
| More literature | Powering IGBT Drivers with Fly-Buck™ | Dec. 03, 2015 | ||
| More literature | Designing isolated rails on the fly with Fly-Buck™ converters | Sep. 29, 2015 | ||
| More literature | Analysis of Power Supply Topologies for IGBT Gate Drivers in Industrial Drives | Jul. 06, 2015 | ||
| More literature | Is Your IGBT Gate-Driver Power Supply Optimized | Mar. 12, 2015 |
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