Wireless EV Charging Frequency Control for Vehicle-Side Efficiency
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Solution Overview
Problem
Existing vehicle control systems struggle to optimize the drive frequency of the inverter on the power transmitting side for efficient power transmission to the power receiving side, particularly when the power receiving device is mounted on a vehicle, leading to suboptimal power transmission efficiency.
Innovation Solution
A vehicle control device that adjusts the drive frequency of the inverter on the ground side based on the battery voltage and required power on the vehicle side, using wide area wireless communication to transmit the optimal drive frequency and performing feedback control to enhance power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the inverter drive frequency is fixed or determined only on the ground side, then the supply device can operate independently, but power transmission efficiency cannot be optimized for the vehicle side conditions
Solution Approach 1:
The patent applies dynamics by making the inverter drive frequency adjustable and adaptable based on vehicle side conditions. The control unit dynamically determines the optimal drive frequency according to battery voltage and required power, and the supply device adjusts its operating frequency accordingly, transitioning from a fixed frequency system to a dynamic, condition-responsive system that optimizes power transmission efficiency.
Solution Approach 2:
The patent implements feedback control where the vehicle control device transmits drive frequency information to the supply device based on battery voltage and power requirements. The supply device receives this feedback and adjusts its inverter operating frequency accordingly, creating a closed-loop control system that continuously optimizes power transmission efficiency based on real-time vehicle side conditions.
2Loss of energy
If the drive frequency is changed to optimize power transmission efficiency, then energy loss is reduced, but communication and coordination between ground side and vehicle side are required
Solution Approach 1:
The patent applies universality by using wide area wireless communication infrastructure for multiple purposes: not only for transmitting drive frequency information but also for coordinating power transmission operations between the ground side supply device and the vehicle side power receiving device. This multi-functional use of the communication system reduces the need for separate dedicated communication channels.
3Adaptability or versatility
If the inverter operates at a fixed drive frequency, then the control system is simple, but it cannot adapt to changes in battery voltage and power requirements on the vehicle side
Solution Approach 1:
The patent applies parameter changes by varying the inverter drive frequency as a controllable parameter based on battery voltage and power requirements. The control unit calculates the optimal drive frequency by changing this critical operating parameter, allowing the system to adapt to different vehicle side conditions while maintaining manageable control complexity through systematic parameter adjustment.
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 system enables power transmission at the optimal drive frequency for the power receiving side, improving efficiency by dynamically adjusting the inverter frequency in response to changes in battery voltage and required power.
Implementation Method 1
a power receiving device that receives power transmitted from a supply device on a ground side in a non-contact manner
Data Source
AI summary
A vehicle control device is mounted on a vehicle that includes a power receiving device that receives power transmitted in a non-contact manner from a ground-side supply device and a battery that charges the power received by the power receiving device. The drive frequency determined based on the requested power of the side is set as the first drive frequency, and the first drive frequency is transmitted to the supply device using wide area wireless communication. When the inverter included in the supply device is controlled to the first drive frequency, the power receiving device receives the power transmitted in a contactless manner and charges the battery, and the power is transferred before and after changing the inverter drive frequency to the first drive frequency. Feedback control is performed to check whether the transmission efficiency is high.