Contactless Charging System Malfunction Protection
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Solution Overview
Problem
Contactless charging systems for motor vehicle batteries face delays in communication, leading to potential damage due to continued power transmission during electrical malfunctions, as the primary inductive circuit may not detect disconnections or malfunctions promptly enough.
Innovation Solution
A contactless charging system with a primary inductive circuit and a secondary inductive circuit coupled to the battery via a rectifier bridge, featuring controlled interruption means that can short-circuit the secondary circuit without damaging the battery during malfunctions, and control means to cut off power supply when a short-circuit is detected, all without relying on wireless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication is used to detect malfunctions, then communication between ground and vehicle is established, but detection delay occurs causing continued power transmission that damages on-board devices
Solution Approach 1:
The patent introduces an intermediary detection mechanism by monitoring the current in the primary inductive circuit as an indirect indicator of secondary circuit status. Instead of relying on wireless communication from the vehicle, the system uses the electromagnetic coupling characteristics themselves to detect malfunctions, achieving immediate local detection without communication delays
Solution Approach 2:
The system implements feedback by continuously monitoring the primary circuit current and comparing it against expected values. When the current deviates from the threshold (indicating secondary circuit disconnection), the system immediately responds by cutting off power transmission, creating a closed-loop control that eliminates detection delays
2Productivity
If power is continuously transmitted by the primary inductive circuit, then charging efficiency is maintained, but on-board devices suffer damage during malfunctions
Solution Approach 1:
The patent applies dynamics by making the power transmission state changeable based on real-time conditions. The system dynamically adjusts between active power transmission (normal operation) and cutoff (malfunction detected) based on the monitored current levels, allowing efficient charging when safe and immediate protection when dangerous
Solution Approach 2:
The system implements preliminary anti-action by detecting malfunction conditions before they can cause damage. By monitoring the primary circuit current and comparing it to a threshold value, the system identifies disconnection anomalies early and preemptively cuts off power transmission, preventing harmful effects before they occur
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
Ensures safe disconnection of the battery from the charging system during electrical malfunctions, preventing potential damage by cutting off power supply before any risk of damage occurs, thus enhancing the safety and reliability of contactless charging.
Implementation Method 1
The transfer of energy between the two inductive circuits takes place by electromagnetic induction
Implementation Method 2
a secondary inductive circuit on board the vehicle and coupled to the battery via a rectifier bridge
Data Source
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AI summary
A contactless charging system (1) for charging a motor vehicle battery (2) comprising a primary induction circuit (3) outside the motor vehicle powered by an electric power network (5), and a secondary induction circuit (4) installed on the motor vehicle and coupled to the battery (2) via a rectifier bridge (8). It comprises controlled switch means (10) capable of putting the secondary induction circuit (4) into short circuit without putting the battery (2) into short circuit when there is an electrical malfunction on board the motor vehicle, and control means capable of cutting off power to the primary induction circuit (3) when they detect a short circuit in the secondary induction circuit (4).