Tapped EV Wireless Charging Coils for High-Voltage Isolation
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Solution Overview
Problem
The high voltages in the transmitter coil and receiver coil of existing wireless charging systems for electric vehicles pose insulation and safety control problems, requiring urgent solutions to ensure safe and reliable charging.
Innovation Solution
A wireless charging system with a tap structure for the transmitter and receiver coils, incorporating LCC compensation circuits and specific coil configurations to reduce voltage levels and improve safety, comprising a pile terminal, ground terminal, and vehicle terminal with inverter and rectifier circuits, and matching coils with center tap structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-power wireless charging is implemented with traditional transmitter and receiver coils, then charging power increases, but the voltage at both ends of the coils reaches kV level causing insulation and safety control problems
Solution Approach 1:
The transmitter coil is divided into multiple coil units (first coil unit, second coil unit, etc.) and the receiver coil is divided into corresponding coil units. Each coil unit operates at lower voltage, avoiding the kV-level voltage that causes insulation problems while maintaining high total charging power through parallel operation of multiple units.
Solution Approach 2:
The patent transitions from a single-coil configuration to a multi-coil array configuration, adding spatial dimension to the charging system. Multiple coil units are arranged in specific patterns (e.g., overlapping or adjacent arrangements) to achieve both high power transfer and voltage distribution, solving the insulation problem by distributing voltage across multiple units.
2Device complexity
If traditional wired charging is used, then charging infrastructure is simple, but electric sparks and arcs occur exposing safety hazards
Solution Approach 1:
The patent replaces the mechanical contact-based wired charging system with a wireless electromagnetic induction charging system. The transmitter coil generates a magnetic field that induces current in the receiver coil, eliminating physical plug connections and thereby eliminating electric sparks and arcs associated with traditional wired charging.
3Ease of operation
If manual wired charging operation is required, then charging control is direct, but poor contact occurs due to frequent plug insertion and extraction
Solution Approach 1:
The patent eliminates the mechanical plug-and-socket connection system entirely, replacing it with wireless electromagnetic coupling. The transmitter and receiver coils establish an inductive link that transfers power without physical contact, eliminating wear and tear from frequent插拔 operations while maintaining reliable power transfer.
Solution Approach 2:
The wireless charging system automatically establishes and maintains the magnetic coupling between transmitter and receiver coils. The system self-adjusts to maintain optimal coupling as vehicles move or position themselves, eliminating the need for manual plug insertion and extraction operations.
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 effectively decreases the voltages of the transmitter and receiver coils by one time, addressing insulation and safety concerns, enhancing product reliability and reducing development and material costs.
Implementation Method 1
generates a high-frequency current from the direct current through an inverter
Implementation Method 2
converting the high-frequency current generated by the charging pile terminal into magnetic field energy and transmitting it
Implementation Method 3
receiving the magnetic field energy, and charging an electric vehicle battery through rectified induced currents result from the magnetic field energy
Implementation Method 4
a first LCC (inductor capacitor capacitor) compensation circuit connected with the inverter circuit, and a transmitter coil used for wireless charging
Data Source
AI summary
The present invention discloses a wireless charging system and an electric vehicle. The system comprising: a pile terminal used for wireless charging; a ground terminal, including an inverter circuit connected with the pile terminal, a first LCC compensation circuit connected with the inverter circuit, and a transmitter coil used for wireless charging; and a vehicle terminal, including a rectifier circuit connected with an on-board battery, a second LCC compensation circuit connected with the rectifier circuit, and a receiver coil matching with the transmitter coil, wherein the transmitter coil and the receiver coil are all provided with a tap structure. The present invention solves the insulation and safety control problems caused by the high voltages of the transmitter coil and the receiver coil and improves the reliability of products.