Boost converter having inactive load mode with low output voltage ripple

EP4616522A1Pending Publication Date: 2025-09-17TEXAS INSTRUMENTS INC
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Patent Information

Application Number
EP2023818171
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-01-10
Filing Date
2023-11-08
Publication Date
2025-09-17

AI Technical Summary

Technical Problem

Boost converters face efficiency issues and increased output voltage ripple during transitions between modes, particularly in low load conditions, due to inefficiencies in the ultra-low quiescent current mode.

Method used

The implementation of an inactive load mode with negative hysteresis control and distinct output voltage target offsets to manage the snooze phase start and end, reducing voltage ripple by using a second offset greater than the first, thereby optimizing mode transitions and efficiency.

Benefits of technology

This approach significantly reduces output voltage ripple from 25mV to 5mV during inactive load mode operations and improves transition efficiency by using negative hysteresis control and separate comparator thresholds, enhancing overall converter performance.

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Abstract

A boost converter control method includes: receiving an output voltage (VOUT, Fig. 15); receiving an output voltage target (VOUT_TAR, Fig. 15); triggering a snooze phase start (SNOOZE_START, Fig. 15) of an inactive load mode based on a comparison of the output voltage (VOUT) relative to the output voltage target (VOUT_TAR) plus a first output voltage target offset (VOFFSET1, Fig. 15); and triggering a snooze phase end (SNOOZE_END, Fig. 15) of the inactive load mode based on a comparison of the output voltage (VOUT) relative to the output voltage target (VOUT_TAR) plus a second output voltage target offset (VOFFSET2, Fig. 15), the second output voltage target offset (VOFFSET2) greater than the first output voltage target offset (VOFFSET1).
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