Dual-Active-Bridge Deadtime Compensation for Load-Driven Heat Loss

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Solution Overview

Problem

Existing direct-current-to-direct-current converters experience inefficiencies and heat dissipation issues due to varying loads, necessitating elaborate cooling systems.

Innovation Solution

A dual-active-bridge converter system with a primary and secondary converter, a transformer, and an electronic controller that adjusts modulation frequency and phase angles based on deadtime compensation to minimize thermal energy dissipation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the converter operates with varying loads, then the converter can adapt to different power demands, but thermal energy dissipation increases and efficiency decreases

Engineering Contradiction:

Improveload adaptationVSAvoidthermal energy dissipation

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent implements dynamic adjustment of modulation frequency and phase angle control parameters based on real-time load conditions. The controller continuously monitors load variations and adapts the converter operation by modifying switching frequencies and phase shifts, enabling the system to maintain optimal efficiency across different load levels while minimizing thermal energy dissipation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes key operational parameters including modulation frequency, phase angle, and switching timing dynamically in response to load variations. By adjusting these parameters, the converter optimizes power transfer efficiency and reduces losses under varying load conditions, directly addressing the contradiction between adaptability and energy loss.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If elaborate cooling systems are added to handle heat dissipation, then thermal management improves, but device complexity increases

Engineering Contradiction:

Improveheat dissipation controlVSAvoidcooling system complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent enables the converter to self-regulate thermal management through intelligent control algorithms that adjust operational parameters in real-time. By dynamically optimizing modulation frequency and phase angle based on load conditions, the system inherently minimizes heat generation, eliminating the need for elaborate external cooling systems and reducing overall device complexity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent converts the potential harm of heat dissipation into a beneficial control mechanism. By using real-time monitoring of operational conditions to dynamically adjust parameters, the system turns what would be a thermal management problem into an opportunity for optimizing efficiency and reducing losses at the source.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Loss of energy

If deadtime compensation is implemented to reduce power loss, then efficiency improves, but control complexity increases

Engineering Contradiction:

Improvepower lossVSAvoidcontrol system complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent implements deadtime compensation through feedback mechanisms that monitor current errors and adjust phase angles accordingly. The controller uses feedback from current sensors and error calculations to dynamically compensate for deadtime effects, reducing power loss while managing control complexity through systematic feedback loops.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies preliminary deadtime compensation by pre-calculating and adjusting phase angles to account for expected deadtime effects. This preliminary adjustment reduces power loss by proactively compensating for switching delays before they occur, rather than reacting to them after the fact.

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system enhances thermal efficiency and reduces power loss by dynamically adjusting modulation frequency and phase angles, minimizing heat generation and improving overall converter performance.

Implementation Method 1

A transformer is coupled between the primary alternating current node and the secondary alternating current node

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12483150B2Dual active bridge converter with deadtime compensation reducing heat for varying loads

Publication Date: 2025.11.25 DEERE & CO

AI summary

An electronic controller is configured to provide control signals to the control terminals of the semiconductor switches of the primary converter and the secondary converter based on a commanded current or target output current; the electronic controller is configured to adjust the phase angle(s), between a respective pairs of semiconductor switches of the primary converter and second converter based on a deadtime compensation module responsive to a current error or current difference between the target output current and the observed output current. A low-pass filter facilitates estimation of the current error for compensation in the commanded current.