Browse Prior Art Database

Multi-phase DC-DC Converter Phase Rotation

IP.com Disclosure Number: IPCOM000236425D
Publication Date: 2014-Apr-24
Document File: 3 page(s) / 21K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a system for a multi-phase direct current-direct current (DC-DC) converter phase rotation. This involves rotating which phases are operating when a multi-phase Voltage-Regulator Down (VRD) is running on a reduced number of phases. Rotating the phases allows the enabling of lower-temperature phases, while disabling phases running at a higher temperature, improving overall efficiency.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 52% of the total text.

Page 01 of 3

Multi-phase DC-DC Converter Phase Rotation


Optimizing the efficiency of a direct current-direct current (DC-DC) converter has become increasingly important. Multi-phase converters typically enable/disable phases based on the current draw to improve the overall efficiency curve. The phases that are added/dropped are predefined and do not vary. As these phases operate, the phase temperatures increase, thus increasing field effect transistor (FET) resistances and lowering overall Voltage-Regulator down (VRD) efficiency. A method of reducing the thermals while running on reduced phases further improves the efficiency of the VRD.

The disclosure involves rotating which phases are operating when a multi-phase VRD is running on a reduced number of phases. Rotating the phases allows the enabling of lower-temperature phases, while disabling phases running at a higher temperature. This is done on a predefined sequence. More than one phase can be simultaneously rotated. No temperature measurements of the phases are made.

To implement this system, a Pulse-Width Modulation (PWM) controller with programmable phase enablement is required. The number of phases that can be simultaneously rotated and the time interval between rotations is user selectable.

The current industry standard is to continuously run the same phases. Under this operating mode, the phases that are running gradually warm up, and the efficiency gradually decreases accordingly. Rotating which phases are operating allows the phases to operate at an average lower...