Wireless Power Transfer System for Electric Vehicles
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Solution Overview
Problem
Existing wireless power transfer systems for electric vehicles often duplicate charging modules between inductive and conductive charging stages, leading to increased volume, weight, and cost due to redundant components.
Innovation Solution
A wireless power transfer system that integrates with existing conductive on-board battery chargers, using a parallel-series compensation network and control strategies to share components, eliminating the need for duplicate DC link capacitors and DC/DC battery chargers, and utilizing a DC blocking and impedance matching network to adapt impedance and voltage levels for efficient inductive charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless power transfer system is designed with separate charging modules for inductive and conductive charging, then charging functionality is ensured, but volume and weight of vehicle assembly increase due to redundant components
Solution Approach 1:
The patent makes the conductive charging modules (DC link capacitor and DC/DC battery charger) serve dual purposes: they function during both conductive charging and inductive charging operations. By integrating the inductive charging interface to share these existing modules, the system achieves multi-functionality without adding redundant components, thus reducing vehicle assembly volume while maintaining full charging versatility
Solution Approach 2:
The patent merges the inductive charging system with the existing conductive charging modules by connecting the inductive charging interface to share the DC link capacitor and DC/DC battery charger. This consolidation eliminates duplicate components and reduces the overall volume of the vehicle assembly while ensuring both charging modes remain fully functional
2Adaptability or versatility
If wireless power transfer system is designed with separate charging modules for inductive and conductive charging, then charging functionality is ensured, but weight of vehicle assembly increases due to redundant components
Solution Approach 1:
The conductive charging modules are designed to perform universal functions across both charging modes. The DC link capacitor and DC/DC battery charger serve as shared resources for both inductive and conductive charging, eliminating the need for duplicate weight-bearing components while maintaining full charging capability
Solution Approach 2:
By combining the inductive charging system with the existing conductive charging infrastructure, the patent eliminates redundant components. The shared DC link capacitor and DC/DC battery charger reduce the total component mass, thereby decreasing vehicle assembly weight without compromising charging functionality
3Adaptability or versatility
If wireless power transfer system is designed with separate charging modules for inductive and conductive charging, then charging functionality is ensured, but cost increases due to redundant components
Solution Approach 1:
The conductive charging modules are designed with universal functionality to serve both inductive and conductive charging modes. This approach eliminates the need to manufacture and stockpile duplicate sets of DC link capacitors and DC/DC battery chargers, significantly reducing component costs and simplifying the manufacturing supply chain while maintaining full charging versatility
Solution Approach 2:
By merging the inductive charging system with the existing conductive charging modules, the patent eliminates redundant component procurement and assembly operations. This consolidation reduces manufacturing complexity and component costs, making the dual-charging system more economically viable without sacrificing functional adaptability
4Reliability
If DC link capacitor is added to wireless power transfer system for voltage regulation, then voltage stability is improved, but volume and weight of vehicle assembly increase
Solution Approach 1:
The DC link capacitor is designed to serve dual purposes: it provides voltage regulation and stability during inductive charging operations while also functioning as part of the conductive charging system. This multi-functional design ensures voltage stability without requiring additional dedicated components, thereby avoiding increases in vehicle assembly volume
5Productivity
If DC/DC battery charger is added to wireless power transfer system for power management, then charging efficiency is improved, but volume and weight of vehicle assembly increase
Solution Approach 1:
The DC/DC battery charger is designed with universal functionality to handle power management for both inductive and conductive charging modes. By making this component multi-functional, the system achieves improved charging efficiency without adding redundant power management hardware, thus avoiding increases in vehicle assembly volume
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 integration reduces the volume, weight, and cost of the vehicle assembly by utilizing the conductive charger's modules during inductive charging, optimizing the charging process and eliminating redundant components, thereby enhancing efficiency and reducing costs.
Implementation Method 1
a receiving VA coil (108) located at the vehicle side, VA (102), magnetically coupled to a transmitting GA coil (107)
Implementation Method 2
The VA (102) comprises a secondary compensation circuit (109) which is a passive circuit network that compensates the receiving coil inductance in order to maximize the transferred power at electrical resonance
Data Source
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AI summary
A wireless power transfer, WPT, (400) system for an electrical vehicle, EV, the WPT system (400) comprising a ground assembly, GA, (401) and a vehicle assembly, VA (402), the GA (401) comprising a GA transmitter coil (407), the VA (402) comprising a VA receiver coil (408) magnetically coupled to the GA transmitter coil (407), characterized in that the WPT (400) comprises a compensation strategy stage (406) (409) that comprises a parallel-series compensation network to obtain a voltage VVA in the VA receiver coil (408) proportional to an effective current Ip_rms in the GA transmitter coil (407), a rectifier (410) in the VA (402) to obtain a continuous voltage Vdc_VA and a control strategy stage (445) with a voltage control loop (450) and a current control loop (455), wherein the control strategy stage (445) provides a control command to regulate voltage in the VA (402) to adjust the continuous voltage Vdc_VA based on a reference DC link voltage, and wherein a DC link of a conductive charger of the EV is regulated with the adjusted continuous voltage Vdc_VA during an inductive charging process of the EV.