Wireless EV Charging Path Control for Low-Loss External Power Feed
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Solution Overview
Problem
Existing vehicle charging systems for electric vehicles lack efficiency in power feeding to external devices, leading to convenience issues due to power loss through relays and inverters during electric power feeding operations.
Innovation Solution
A vehicle charging system incorporating a rectifier, inverter, first and second relays, and a control processor that controls the operation states of these components based on equipment, battery, and external device power requirements, allowing for contactless charging and efficient electric power feeding without passing through the battery and inverter in certain scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electric power is fed to external devices through the battery and inverter, then the vehicle charging system can provide power to external devices, but power loss occurs through relays and inverters reducing efficiency
Solution Approach 1:
The patent divides the power feeding path into two separate relays: a first relay for charging control and a second relay for power feeding control. This segmentation allows independent control of charging and power feeding operations, enabling direct power feeding from the coil to external devices without passing through the battery and inverter, thus reducing power loss while maintaining operational convenience
Solution Approach 2:
The patent introduces a control processor as an intermediary that intelligently manages the operation states of both relays based on equipment power, battery requested power, and external device power requirements. This intermediary coordination enables optimal power flow selection, allowing direct power feeding when appropriate to minimize losses while ensuring system safety and reliability
2Productivity
If a single relay is used for both charging and power feeding, then the system structure is simple, but power feeding efficiency is reduced due to unnecessary power loss through the inverter
Solution Approach 1:
The patent segments the power control system into two distinct relay circuits: one dedicated to charging operations and another to power feeding operations. This structural segmentation enables efficient direct power feeding from the coil to external devices when needed, significantly improving power feeding efficiency while maintaining reasonable system complexity through modular design
Solution Approach 2:
The control processor dynamically adjusts the operation states of the first and second relays based on real-time power requirements. This dynamic control allows the system to switch between different power flow paths optimally, achieving high productivity by selecting the most efficient path while adapting to varying operational conditions without requiring overly complex fixed infrastructure
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 configuration enhances the efficiency of electric power feeding to external devices, improving convenience by minimizing power loss and optimizing charging and feeding operations.
Implementation Method 1
a rectifier, disposed on a charging path from a coil (12) in the electric vehicle to a battery (11) of the electric vehicle
Implementation Method 2
an inverter, disposed on a first electric power feeding path from the battery to an electric power output terminal (14) of the electric vehicle
Implementation Method 3
contactless charging of the battery via the charging path from external equipment
Data Source
AI summary
A vehicle charging system to be applied to an electric vehicle includes a rectifier, an inverter, first and second relays, and a control processor. The rectifier is disposed on a charging path. The inverter is disposed on a first power feeding path. The first and second relays are respectively disposed on the charging path and a second power feeding path. The control processor performs control that allows for: contactless charging via the charging path from external equipment; and first power feeding to an external device via the charging path and the first power feeding path from the external equipment, or second power feeding to the external device via the second power feeding path from the external equipment. The control processor controls operation states of the relays in accordance with power being supplied from the external equipment, power requested at a battery, and power necessary at the external device.