Wireless Power Transmission Device Operating Point Search Control
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Solution Overview
Problem
The existing wireless power transmission systems face inefficiencies due to varying factors, leading to increased size and cost of the power reception device, as the power transmission efficiency is not fixed at the start of transmission, resulting in high reception power requirements.
Innovation Solution
The power transmission device sets the transmission power to a first value initially and performs operating point search control, maintaining it if reception power meets the target or increasing it to a second value if not, to optimize efficiency and reduce the allowable reception power, thus preventing excessive size and cost of the power reception device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the transmission power is set to a large value close to the maximum output at the start of power transmission, then the power transmission efficiency may become optimal, but the reception power becomes very large, requiring the power reception device to be designed with a very large allowable reception power, which increases the size and cost of the power reception device
Solution Approach 1:
The controller performs operating point search control before setting the transmission power to a large value. This preliminary action determines the optimal operating conditions (frequency, impedance) in advance, allowing the system to subsequently operate at high efficiency without requiring excessive transmission power, thereby reducing the reception power and the size/cost of the power reception device.
Solution Approach 2:
The controller performs operating point search control by altering the driving frequency and monitoring the power transmission efficiency. This feedback mechanism allows the system to identify and lock onto the optimal operating point, ensuring high transmission efficiency while maintaining appropriate reception power levels that do not require oversized reception device components.
2Power
If the transmission power is set to a large value close to the maximum output of the power transmission device, then the reception power increases, but this requires designing the allowable reception power of the power reception device to a very large value, which increases the cost of the power reception device
Solution Approach 1:
The controller performs operating point search control before setting the transmission power to a large value. This preliminary action determines the optimal operating conditions (frequency, impedance) in advance, allowing the system to subsequently operate at high efficiency without requiring excessive transmission power, thereby reducing the reception power and the size/cost of the power reception device.
3Measurement precision
If the operating point search control is performed while the transmission power is set to a large value, then the optimal operating point can be found, but the reception power becomes very large during the search process, requiring the power reception device to be designed with a very large allowable reception power
Solution Approach 1:
The controller performs operating point search control before setting the transmission power to a large value. This preliminary action determines the optimal operating conditions (frequency, impedance) in advance, allowing the system to subsequently operate at high efficiency without requiring excessive transmission power, thereby reducing the reception power and the size/cost of the power reception device.
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 approach allows for appropriate power transmission while minimizing the size and cost of the power reception device by optimizing power transmission efficiency and ensuring the reception power meets the target, preventing unnecessary increases in device size and cost.
Implementation Method 1
a power transmission coil configured to transmit power in a wireless manner to a power reception device
Data Source
AI summary
The power transfer system includes a power transmission device and a power reception device disposed in the vehicle. The power transmission device includes a power transmission coil configured to transmit power in a wireless manner to the power reception device, an inverter configured to generate an AC transmission power and supply it to the power transmission coil, and a power supply ECU. When the transmission of power to the power reception device is started, the power supply ECU sets the transmission power at the start of power transmission to a first power which is lower than a second power, and performs the operating point search control in that state. If the reception power is lower than a tai et reception power after the operating point search control is completed, the power supply ECU sets the transmission power to the second power which is higher than the first power.