Vehicle Power Supply Circuit for Low-Frequency Inductive Charging

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Solution Overview

Problem

Existing contactless power transmission systems for vehicle energy storage units operate at high frequencies, requiring close proximity and pose health and environmental risks, and existing transformer solutions do not specify transfer frequencies.

Innovation Solution

A power supply circuit using inductive coupling with a primary and secondary subcircuit, each with three switching arms and a control unit, allowing energy exchange at AC voltage frequency, reducing bulk and cost, and incorporating inverters/rectifiers for efficient power transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high frequency operation is used for contactless power transmission, then power transmission efficiency is improved, but health risks and environmental impact increase

Engineering Contradiction:

Improvepower transmission efficiencyVSAvoidhealth risks

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the operating frequency parameter from high frequency (85 kHz or more) to low frequency (50 Hz or 60 Hz matching AC voltage frequency), thereby maintaining power transmission capability while eliminating health risks and environmental harm associated with high frequency electromagnetic radiation

Inventive Principle:

Principle #35Parameter changes

2Power

If high frequency operation is used for contactless power transmission, then power transmission capability is improved, but distance between subcircuits must be small

Engineering Contradiction:

Improvepower transmission capabilityVSAvoiddistance between subcircuits

Core Design Contradiction:

PowerVSLength of moving object

Solution Approach 1:

The patent changes the operating frequency parameter to low frequency (50 Hz or 60 Hz), which enables power transmission capability while allowing greater distance between primary and secondary subcircuits compared to high frequency systems

Inventive Principle:

Principle #35Parameter changes

3Power

If contactless power transmission at kW level is implemented, then power transmission is achieved, but health risks and environmental impact occur

Engineering Contradiction:

Improvepower transmission levelVSAvoidenvironmental risk

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The patent changes the operating frequency parameter from high frequency to low frequency (50 Hz or 60 Hz), enabling kW-level power transmission while eliminating environmental risks associated with high frequency electromagnetic radiation

Inventive Principle:

Principle #35Parameter changes

4Adaptability or versatility

If two separate inverter/rectifier circuits are used, then power conversion function is complete, but device bulk and cost increase

Engineering Contradiction:

Improvepower conversion functionVSAvoiddevice bulk

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges two separate inverter/rectifier circuits into a single integrated circuit that performs both inversion and rectification functions, thereby completing the power conversion function while reducing device bulk and complexity

Inventive Principle:

Principle #5Merging (Combining)

5Adaptability or versatility

If two separate inverter/rectifier circuits are used, then power conversion function is complete, but manufacturing cost increases

Engineering Contradiction:

Improvepower conversion functionVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent merges two separate inverter/rectifier circuits into a single integrated circuit, thereby completing the power conversion function while reducing manufacturing cost through reduced component count and simplified assembly

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

The solution enables safe, efficient, and cost-effective power transfer to vehicle energy storage units at lower frequencies, reducing health risks and environmental impact while optimizing energy exchange.

Implementation Method 1

the primary subcircuit and the secondary subcircuit being configured to contactlessly exchange electrical energy by way of inductive coupling at the frequency of the AC voltage

Methodology Applied

Scientific EffectInductive coupling: Electromagnetic Induction

Data Source

PatentUS20260021719A1Power supply circuit for a vehicle electrical energy storage unit

Publication Date: 2026.01.22 VALEO ELECTRIFICATION

AI summary

A power supply circuit includes a primary sub-circuit and the secondary sub-circuit configured to exchange electrical energy via inductive coupling at the frequency of the alternating voltage at the input of the primary sub-circuit. The primary sub-circuit includes, for each phase of the alternating voltage at its input, first, second and third switching arms connected in parallel. The first switching arm includes two controllable electronic switches in series, between which a first terminal of the phase of a network is connected. The second switching arm includes two controllable electronic switches in series, between which a second terminal of the phase of the network is connected, and between which a first terminal of a primary inductive cell for contactless energy exchange is connected. The third switching arm includes two controllable electronic switches in series, between which a second terminal of the primary inductive cell for contactless energy exchange is connected.