Parallel Boost Converter Feed Forward Control

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Solution Overview

Problem

In power supply devices with multiple boost converters, simultaneous operation using feed forward control can lead to current circulation and increased losses due to slight deviations in switching timing caused by variations in converter elements and performance.

Innovation Solution

The power supply device operates only one boost converter using feed forward control when feedback control is not possible, preventing current circulation and maintaining power supply by limiting the number of active converters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If multiple boost converters are operated simultaneously by feed forward control, then power supply capacity is increased, but current circulation occurs due to switching timing deviations causing increased losses

Engineering Contradiction:
Improvepower supply capacityVSAvoidenergy loss
Core Design Contradiction:
PowerVSLoss of energy

Solution Approach 1:

The control device monitors the actual switching timing of each boost converter and adjusts the gate signal timing dynamically to compensate for deviations. This feedback mechanism eliminates current circulation between converters while maintaining simultaneous operation, thus preserving high power supply capacity without the energy losses that would otherwise occur

Inventive Principle:
Principle #23Feedback

2Power

If multiple boost converters are operated simultaneously by feed forward control, then power supply capacity is increased, but heat generation increases due to current circulation

Engineering Contradiction:
Improvepower supply capacityVSAvoidheat generation
Core Design Contradiction:
PowerVSTemperature

Solution Approach 1:

By continuously monitoring switching timing and dynamically adjusting gate signals based on actual converter performance, the feedback control prevents current circulation between parallel converters. This eliminates the primary source of excessive heat generation, allowing simultaneous operation at high power capacity without thermal problems

Inventive Principle:
Principle #23Feedback

3Loss of energy

If only one boost converter is operated by feed forward control, then current circulation is suppressed, but power supply capacity is reduced

Engineering Contradiction:
Improveenergy lossVSAvoidpower supply capacity
Core Design Contradiction:
Loss of energyVSPower

Solution Approach 1:

The feedback control enables all multiple boost converters to operate simultaneously by dynamically adjusting their switching timing. This resolves the contradiction by allowing full power supply capacity from all converters while preventing current circulation through real-time timing synchronization, thus achieving both high power output and low energy loss

Inventive Principle:
Principle #23Feedback

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

This approach suppresses current circulation and heat generation, ensuring stable power delivery even when feedback control is unavailable, thereby reducing losses and maintaining operational efficiency.

Implementation Method 1

a plurality of boost converters connected in parallel configured to boost and supply power from a power storage device

Methodology Applied
Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS11312247B2Power supply device
Publication Date: 2022.04.26 DENSO CORP
  • US11312247B2 patent drawing
  • US11312247B2 patent drawing

AI summary

The power supply device includes a plurality of boost converters connected in parallel to boost and supply power from the power storage device, and a control device for controlling each of the boost converters. When the electronic control unit 50 cannot operate the plurality of boost converters by the feedback control, the control device operates only one of the plurality of boost converters by the feed forward control.