Underwater Power Receiver Voltage Control via Feedback
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Solution Overview
Problem
In underwater power transmission systems, the input voltage to a DC/DC power supply in an autonomous underwater vehicle varies with charging current, leading to inefficiencies and potential system shutdowns due to inability to control voltage within appropriate ranges.
Innovation Solution
A power receiver apparatus equipped with sensors to detect rectified voltage and charging current, a processor to determine optimal power transmission voltage, and a communication device to adjust the voltage control, ensuring efficient power transmission to the storage battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power is transmitted wirelessly to an underwater vehicle with a DC/DC power supply, then the vehicle can be charged without contact, but the input voltage to the DC/DC power supply varies with charging current causing efficiency deterioration
Solution Approach 1:
The patent implements a feedback control mechanism where the rectified voltage detected by the first sensor and charging current detected by the second sensor are used to determine the power transmission voltage. The processor adjusts the power transmission voltage based on these detected values, creating a closed-loop control system that maintains optimal operating conditions for the DC/DC power supply while enabling wireless charging.
Solution Approach 2:
The patent dynamically changes the power transmission voltage parameter based on the charging current and rectified voltage conditions. By adjusting the power transmission voltage to match the varying charging requirements, the system maintains the input voltage to the DC/DC power supply within the optimal range, preventing efficiency deterioration while enabling flexible wireless charging operation.
2Productivity
If charging current is increased stepwise from the start of charging, then the storage battery can be charged effectively, but the input voltage to the DC/DC power supply may fall outside the appropriate range causing system shutdown
Solution Approach 1:
The feedback mechanism continuously monitors the rectified voltage and charging current, and the processor adjusts the power transmission voltage in real-time based on these measurements. This ensures that even as charging current increases stepwise to improve charging speed, the input voltage to the DC/DC power supply remains within the appropriate range, preventing system shutdown and ensuring reliable continuous operation.
Solution Approach 2:
The system dynamically adjusts the power transmission voltage in response to changing charging conditions. As the charging current increases stepwise during the charging process, the power transmission voltage is dynamically modified to compensate for voltage variations, maintaining stable operation of the DC/DC power supply and preventing system shutdown while achieving effective charging.
3Adaptability or versatility
If the power transmission voltage is not controlled within an appropriate range, then the charging process can proceed without voltage constraints, but the voltage conversion efficiency of the DC/DC power supply decreases and rating of use is not satisfied
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the power transmission voltage based on the detected rectified voltage and charging current. This allows the system to maintain voltage flexibility and adapt to different charging conditions while ensuring the input voltage to the DC/DC power supply remains within the appropriate range, thereby maintaining high voltage conversion efficiency and satisfying the rating of use.
Solution Approach 2:
The feedback control system uses the detected rectified voltage and charging current to continuously adjust the power transmission voltage. This ensures that even with voltage flexibility to adapt to different charging stages and conditions, the input voltage to the DC/DC power supply is maintained within the optimal range, preventing efficiency loss and ensuring the system operates within its rated capacity.
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 solution allows for precise control of power transmission voltage based on charging current, maintaining high efficiency of the DC/DC power supply and preventing system shutdowns.
Implementation Method 1
a power receiver resonance coil configured to receive power wirelessly transmitted from a power transmitter resonance coil of the power transmitter apparatus in a non-contact manner by using the magnetic resonance method
Implementation Method 2
a rectifier that converts an AC voltage induced in the power receiver apparatus on a secondary side into a DC voltage
Data Source
AI summary
A power receiver apparatus is movable under water. The power receiver apparatus includes: a power receiver device configured to receive power wirelessly transmitted from a power transmitter apparatus; a power supply device including a storage battery and configured to charge the storage battery based on received power received by the power receiver device; a first sensor configured to detect a rectified voltage value rectified based on the received power; a second sensor configured to detect a charging current value to the storage battery charged by the power supply device; a processor configured to determine a power transmission voltage value corresponding to the power wirelessly transmitted from the power transmitter apparatus based on the rectified voltage value and the charging current value; and a communication device configured to transmit the power transmission voltage value determined by the processor to the power transmitter apparatus.