Wireless Power Transfer Control Under Output Power Limits
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Solution Overview
Problem
Existing power transfer systems for electric vehicles fail to adequately adjust power supply based on the operation states of the vehicles or fixed facilities, leading to potential over-supply and inefficiencies.
Innovation Solution
A wireless power transfer system that includes a transmission circuit, multiple transmission apparatuses, reception apparatuses, and a power supply suppression unit, which uses reception apparatus side information to control power supply to ensure that the total power supply does not exceed an output power limit, the system adjusts power supply based on the operation states of the vehicles or fixed facilities, ensuring that the total power demand does not exceed the system's output limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a charging schedule is controlled based on remaining capacity and destination of each electric vehicle, then power supply timing can be managed, but the amount of power supply is not sufficiently suppressed depending on the operation state of the electric vehicle or fixed facility
Solution Approach 1:
The system dynamically adjusts the power supply amount based on real-time operation states of reception apparatuses. The power supply suppression unit continuously monitors operation state information from multiple reception apparatuses and adjusts the power supply amount accordingly, transitioning from static charging schedules to dynamic power management that adapts to changing operational conditions.
Solution Approach 2:
The system implements feedback control by acquiring operation state information from reception apparatuses and using this information to adjust power supply. The power supply suppression unit receives feedback about the operational status of each reception apparatus and modifies the power supply amount to prevent excessive power consumption, ensuring the total power supply remains within the output power limit.
2Productivity
If power is supplied to multiple reception apparatuses simultaneously, then power distribution can be provided to all devices, but the total power supply may exceed the output power limit of the system power source
Solution Approach 1:
The power supply suppression unit implements partial power supply to reception apparatuses when the total power demand exceeds the output power limit. Instead of supplying power to all reception apparatuses at full capacity, the system selectively supplies power to a subset of apparatuses or reduces power to some, ensuring the total power consumption remains within the system's output power limit while still providing power distribution capability.
3Power
If the system power source outputs maximum power continuously, then power supply capacity is maximized, but the system cannot continue operation when power demand exceeds sustainable output
Solution Approach 1:
The power supply suppression unit proactively prevents the total power supply from exceeding the output power limit by monitoring and adjusting power distribution before overload occurs. This preliminary control action ensures the system operates within sustainable power levels, preventing situations where the power source would be forced to output beyond its continuous operation capability, thereby maintaining both power supply capacity and continuous operation capability.
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 effectively manages power supply to prevent over-supply and inefficiencies by adjusting power distribution based on the operation states of the vehicles or fixed facilities, reducing the introduction cost and maintaining power efficiency.
Implementation Method 1
a transmission circuit supplied with power from a system power source (PS), supplying a high frequency AC power having a predetermined operating frequency
Implementation Method 2
a plurality of transmission apparatuses mutually connected in parallel to the transmission circuit, capable of supplying power in a wireless manner
Data Source
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AI summary
A wireless power transfer system (1000, 1000A,1000B) is provided with a transmission circuit (110, 110A) supplied with power from a system power source (PS), supplying a high frequency AC power having a predetermined operating frequency; a plurality of transmission apparatuses (120, 120A, 120B) mutually connected in parallel to the transmission circuit, capable of supplying power in a wireless manner; a plurality of reception apparatuses (200), when being located in any one of transmission areas where the transmission apparatuses are capable of transmitting power, receiving power from the transmission apparatus in a wireless manner; and a power supply suppression unit (400) that controls respective reception apparatuses such that a total amount of power supply required by the plurality of reception apparatuses does not exceed an output power limit. The respective reception apparatuses transmit reception apparatus side information to a power supply suppression unit, and the power supply suppression unit utilizes the reception apparatus side information to control the respective reception apparatuses.