Parallel Filter Circuit Layout for Balanced Contactless Power Output

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Solution Overview

Problem

Existing power transmission systems face issues with current imbalance and increased power loss due to variations in element characteristics of reactors and capacitors in filter circuits, especially when additional filter circuits are added in parallel to existing ones.

Innovation Solution

A power output circuit design featuring multiple circuit blocks with filters, where reactors and capacitors are connected in series and their connection lines are interconnected, ensuring balanced current values and transient characteristics across filters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If filter circuits are added in parallel to increase power supply capacity, then power supply capacity is improved, but current imbalance and power loss increase due to variations in element characteristics

Engineering Contradiction:

Improvepower supply capacityVSAvoidpower loss

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The patent connects the connection lines between reactors and capacitors in parallel filter circuits together, merging the circuits into a unified structure. This ensures that current variations in one filter circuit are compensated by others, maintaining balanced current distribution and reducing power loss while preserving increased power supply capacity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates homogeneous current characteristics across parallel filter circuits by interconnecting their connection lines. This ensures that all filter circuits operate with consistent current values and transient characteristics, eliminating the heterogeneity caused by element variations and preventing power loss.

Inventive Principle:

Principle #33Homogeneity

2Power

If filter circuits are added in parallel to increase power supply capacity, then power supply capacity is improved, but current imbalance occurs due to variations in element characteristics

Engineering Contradiction:

Improvepower supply capacityVSAvoidcurrent balance

Core Design Contradiction:

PowerVSStability of the object's composition

Solution Approach 1:

The patent merges parallel filter circuits by connecting their internal connection lines together, creating a unified current distribution system. This ensures that current imbalances in individual circuits are compensated by the interconnected structure, maintaining stable and balanced current composition across all filters while preserving increased power capacity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent establishes equipotential conditions for current distribution by interconnecting the connection lines between reactors and capacitors in parallel filters. This ensures that all filter circuits operate at the same current potential, eliminating imbalances caused by element variations and maintaining stable current composition.

Inventive Principle:

Principle #12Equipotentiality

3Power

If filter circuits are added in parallel, then power supply capacity is improved, but transient characteristics become unbalanced across filters

Engineering Contradiction:

Improvepower supply capacityVSAvoidtransient characteristics

Core Design Contradiction:

PowerVSStability of the object's composition

Solution Approach 1:

The patent merges the transient response characteristics of parallel filter circuits by interconnecting their internal lines. This ensures that transient variations in one circuit are shared and stabilized by the interconnected structure, maintaining balanced transient characteristics across all filters while preserving increased power supply capacity.

Inventive Principle:

Principle #5Merging (Combining)

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 design effectively suppresses current imbalances and reduces power loss by stabilizing output currents, maintaining filter performance without reducing its effectiveness.

Implementation Method 1

each of the plurality of filters includes a reactor and a capacitor connected to the reactor at a node differing from an output node

Methodology Applied

Scientific EffectFilter (electronic): Filter (electronic)

Implementation Method 2

Each of the plurality of filters includes a reactor and a capacitor connected to the reactor

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS20250105671A1Power output circuit and contactless power supply system

Publication Date: 2025.03.27 DENSO CORP

AI summary

A power output circuit includes a plurality of circuit blocks that are provided in power wirings to which power is inputted and connected to each other side by side. Each of the plurality of circuit blocks includes at least a filter in a last post-stage. Each of the plurality of filters includes a reactor and a capacitor connected to the reactor at a node differing from an output node. Either of the reactor and the capacitor provided in each of the plurality of filters is connected to the power wirings in series so as to connect with the output node. A connection line between the reactor and the capacitor in one filter is connected to a connection line between the reactor and the capacitor in the remaining other filter.