Wireless Power Supply Pre-Check for Vehicle Charging Position
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Solution Overview
Problem
Existing wireless power reception systems for vehicles in motion face challenges in determining suitable charging positions, leading to unnecessary current flow and energy loss, which results in a leakage magnetic field.
Innovation Solution
A dynamic power supply system that includes a pre-power-supply check mechanism, where the power-supply-side controller fixes the output voltage of the inverter circuit to a predetermined first voltage and the power-receiving-side controller fixes the input voltage of the DC-DC converter to a second voltage, allowing the system to determine if the vehicle is at a suitable position for charging and only initiate main power supply when sufficient electric power is received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wireless power reception system starts charging operation when detection value reaches reference value, then the vehicle can receive electric power, but unnecessary current flow and energy loss occur when the vehicle is not at a suitable charging position
Solution Approach 1:
The patent applies preliminary action by implementing a pre-power-supply check phase before main charging operation. During this preliminary phase, the system checks whether the supplied electric power reaches a predetermined level while fixing inverter output voltage and DC-DC converter input voltage to predetermined values. Only when this check succeeds does the system proceed to main power supply, thereby preventing unnecessary energy loss from premature charging initiation.
2Ease of operation
If the charging operation starts based on voltage or current detection value, then the power reception device can begin charging, but the system cannot accurately determine if the vehicle is at a suitable charging position
Solution Approach 1:
The patent applies feedback by continuously monitoring the supplied electric power during the pre-power-supply check and using this information to determine whether to proceed to main charging. The system fixes the inverter output voltage and DC-DC converter input voltage to predetermined values during the check, measures the actual supplied power, and uses this feedback to make an accurate determination of suitable charging position before initiating full charging operation.
3Duration of action of stationary object
If the system supplies electric power from capacitor unit when detection value falls below reference value, then continuous power supply is maintained, but power supply efficiency decreases due to unnecessary current flow
Solution Approach 1:
The patent applies preliminary action by requiring a successful pre-power-supply check before initiating main charging operation. The system fixes inverter output voltage and DC-DC converter input voltage to predetermined values during the check phase, and only when the supplied electric power reaches the predetermined level does it proceed to main charging. This prevents unnecessary current flow and maintains high power supply efficiency while ensuring continuous power supply when conditions are met.
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 ensures that battery charging occurs only when the vehicle is in a suitable position, preventing unnecessary current flow and reducing energy loss, thereby improving power supply efficiency.
Implementation Method 1
a power transmitter connected to the inverter circuit and configured to transmit an alternating-current electric power
Implementation Method 2
a power receiver configured to receive the alternating-current electric power transmitted from the power transmitter
Data Source
AI summary
A period for performing pre-power-supply check prior to main power supply from a power supply device to a power reception device is provided and, a power-receiving-side controller is configured to: check a supplied electric power supplied from the power supply device to the power reception device, in a state where an effective value of an output voltage of a inverter circuit is fixed to a predetermined first voltage by the power-supply-side controller and an input voltage of the DC-DC converter is fixed to a predetermined second voltage by the power-receiving-side controller, in the pre-power-supply check, and cause, in response to the supplied electric power being equal to a predetermined electric power or more, the power supply device to start the main power supply.