Parallel Coil Driver Circuits for High-Power EV Wireless Charging

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Solution Overview

Problem

High-power induction type power supply systems face challenges in efficiently transmitting power to electric vehicles due to the high costs and complexity of components like coils and driver devices, which are required to handle greater voltage and current levels compared to mobile phone charging, and existing wireless communication methods struggle to accurately communicate during high-power transmission.

Innovation Solution

The system employs multiple coils connected in parallel with corresponding power driver circuits at the supplying-end and receiving-end modules, utilizing a coil modulation technique for data exchange and wireless communication to manage power transmission efficiently, allowing for synchronized power dispersion and reduced component stress.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If high-power driver devices and coils with high power specifications are used to meet the charging power requirement of electric vehicles, then the charging power can reach at least 10 kW, but the cost increases and production becomes difficult

Engineering Contradiction:

Improvecharging powerVSAvoidproduction difficulty

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The patent divides the high-power transmission system into multiple parallel channels, each handling a portion of the total power. Instead of using a single high-power driver device and coil, the system employs multiple lower-power driver devices (e.g., five 2kW drivers for a 10kW system) connected in parallel with multiple coils, making each component easier to manufacture and assemble while achieving the required total power output

Inventive Principle:

Principle #1Segmentation

2Power

Engineering Contradiction:

Improvecharging powerVSAvoidcost

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The patent segments the high-power system into multiple parallel lower-power channels. Each channel uses affordable, commercially available driver devices and coils rated for lower power levels. By paralleling these channels, the system achieves high total power output (10kW or more) while keeping individual component costs low, thereby reducing overall system cost compared to using a single high-power component

Inventive Principle:

Principle #1Segmentation

3Reliability

If multiple coils connected in parallel with multiple power driver circuits are used, then power dispersion is achieved and component stress is reduced, but device complexity increases

Engineering Contradiction:

Improvecomponent stress distributionVSAvoidsystem structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs multiple independent driver-coil channels connected in parallel, where each channel operates semi-independently. This segmentation distributes the electrical and thermal stress across multiple components rather than concentrating it in a single high-power component, improving reliability and reducing component stress while maintaining manageable system complexity through modular architecture

Inventive Principle:

Principle #1Segmentation

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 reduces manufacturing and maintenance costs, enhances communication performance, and enables reliable high-power transmission to electric vehicles by using lower-power specification components in parallel, while ensuring accurate communication and power management.

Implementation Method 1

In an induction type power supply system, the power supplying terminal and the power receiving terminal respectively include a coil for performing inductive power transmissions (or called wireless charging)

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

Each of the plurality of power driver circuits comprises a first resonant capacitor, a second resonant capacitor, a first driver and a second driver. The first driver is coupled to the first terminal of the plurality of supplying-end coils through the first resonant capacitor

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS20230163636A1Supplying-end module, receiving-end module and communication method thereof

Publication Date: 2023.05.25 FU TONG TECH

AI summary

A supplying-end module for an induction type power supply system includes a plurality of supplying-end coils and a plurality of power driver circuits. The plurality of supplying-end coils are connected in parallel and include a first terminal and a second terminal. Each of the plurality of power driver circuits includes a first resonant capacitor, a second resonant capacitor, a first driver and a second driver. The first driver is coupled to the first terminal of the plurality of supplying-end coils through the first resonant capacitor, and the second driver is coupled to the second terminal of the plurality of supplying-end coils through the second resonant capacitor.