DC-to-DC Converter Dynamic Mode Switching for Efficiency

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Solution Overview

Problem

Existing DC-to-DC converters face inefficiencies in both synchronous rectification and chopper methods, with high switching losses at small currents and low efficiency at large currents, due to voltage drops in diodes and reverse current flow through low-side switches.

Innovation Solution

A DC-to-DC converter design that dynamically switches between chopper and synchronous rectification modes based on the peak current value of the high-side switch, using a high-side and low-side controller to select the optimal mode for improved efficiency across a wide current range, with hysteresis to stabilize output voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If low-side switch is turned on at small current, then reverse current flow occurs, but efficiency deteriorates

Engineering Contradiction:
Improvecurrent flow controlVSAvoidefficiency
Core Design Contradiction:
Ease of operationVSLoss of energy

Solution Approach 1:

The patent implements dynamic control of the low-side switch based on current direction and magnitude. The control unit detects reverse current flow conditions and dynamically adjusts the switching timing to prevent efficiency deterioration, ensuring optimal performance across different current conditions.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentUS8729873B2DC-to-DC converter with high-side switch and low-side switch
Publication Date: 2014.05.20 KK TOSHIBA
  • US8729873B2 patent drawing
  • US8729873B2 patent drawing
  • US8729873B2 patent drawing

AI summary

In general, according to one embodiment, a DC-to-DC converter includes a high-side switch, a low-side switch, a diode, a high-side controller and a low-side controller. The low-side switch is connected in series with the high-side switch. The diode is connected in parallel with the low-side switch. The high-side controller has a detector for detecting a current of the high-side switch and controls the high-side switch to be turned on or off in accordance with an output of the detector. The low-side controller controls the low-side switch to be turned off when the high-side switch is ON and controls the low-side switch to be turned on or off in accordance with a peak value of the output of the detector when the high-side switch is OFF.