Wireless Charging Controller Reduces Coil Load During Vehicle Start
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Solution Overview
Problem
The power transmitting efficiency decreases when a vehicle is started during battery charging due to positional deviations between the coils, leading to a high load on the power transmitting unit's circuit.
Innovation Solution
A control mechanism is implemented to reduce the power feeding amount from the power transmitting coil to the power receiving coil when the vehicle is about to start, thereby preventing high voltage and load application on the power transmitting unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the voltage applied to the coil is increased to maintain output when power transmitting efficiency decreases, then the output power is maintained, but a high load is applied to the circuit of the power transmitting unit
Solution Approach 1:
The control device detects vehicle start conditions (such as acceleration requests or gear shifts) before the vehicle actually moves, and proactively reduces or stops power feeding to the receiving coil. This preliminary action prevents the situation where power feeding continues at high levels while the vehicle is moving, which would cause positional deviation and efficiency loss. By acting in advance, the system maintains reliability without compromising output power during normal operation.
Solution Approach 2:
The system continuously monitors vehicle operating parameters (acceleration pedal position, brake status, gear position) and uses this feedback to dynamically adjust the power feeding amount. When the feedback indicates the vehicle is starting or moving, the control device automatically reduces power output. This closed-loop control ensures that power is only fed when the vehicle is stationary and properly positioned, preventing high load conditions while maintaining sufficient output power during charging.
2Productivity
If power feeding continues when the vehicle is started, then charging continues, but power transmitting efficiency decreases due to positional deviation between coils
Solution Approach 1:
The control device detects vehicle start conditions (such as acceleration requests or gear shifts) before the vehicle actually moves, and proactively reduces or stops power feeding to the receiving coil. This preliminary action prevents the situation where power feeding continues at high levels while the vehicle is moving, which would cause positional deviation and efficiency loss. By acting in advance, the system maintains reliability without compromising output power during normal operation.
Solution Approach 2:
The system continuously monitors vehicle operating parameters (acceleration pedal position, brake status, gear position) and uses this feedback to dynamically adjust the power feeding amount. When the feedback indicates the vehicle is starting or moving, the control device automatically reduces power output. This closed-loop control ensures that power is only fed when the vehicle is stationary and properly positioned, preventing high load conditions while maintaining sufficient output power during charging.
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 control mechanism maintains power transmitting efficiency and prevents high load application on the power transmitting unit, reducing the risk of circuit damage and maintaining system durability.
Implementation Method 1
The power supply control device outputs a control signal to the feeding power supply in accordance with an operation of the feeding command unit, and the feeding power supply supplies an AC exciting current to the first coil, whereby an induced magnetic flux is generated. According to this induced magnetic flux, an AC induced electromotive force is induced in the second coil
Data Source
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AI summary
There is provided a vehicle-side charging apparatus disposed in a vehicle (2). The charging apparatus includes a power receiving coil (21) which receives power from a power transmitting coil (11) disposed in a power feeding apparatus (1) in a non-contacting manner through at least magnetic coupling, a battery (25) which is charged by reception power of the power receiving coil (21), and a vehicle-side controller (20) which controls battery charge of the battery and outputs a command of a power feeding amount to the power feeding apparatus. The power feeding amount is an amount of power feeding from the power transmitting coil to the power receiving coil. The vehicle-side controller (20) determines whether or not the vehicle (2) is to be started. The vehicle-side controller (20) outputs a command for decreasing the power feeding amount to the power feeding apparatus (1) when the vehicle-side controller (20) determines that the vehicle (2) is to be started during the power feeding from the power transmitting coil (11) to the power receiving coil (21).