Underwater Inductive Charging Control for Feedback Delay Stability
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Solution Overview
Problem
The existing underwater power supply systems using stack DC/DC power supplies face operational instability due to operating delays in feedback control systems, which affect the charging of storage batteries, especially when the load moves underwater.
Innovation Solution
An underwater power supply system comprising a power transmission device with a coil for transmitting power via a magnetic field and a processor for controlling power, and a power reception device with a coil for receiving power, general-purpose power supply components, a storage battery, and a processor for periodically controlling the charging current, including a current sensor to detect and adjust the charging current based on feedback control parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If feedback control is implemented using a stack DC/DC power supply in the power reception system, then the charging configuration can be customized and system construction cost can be reduced, but an operating delay occurs in the feedback system causing unstable operation of the undersea power supply
Solution Approach 1:
The patent applies preliminary action by measuring the delay time in advance before feedback control is executed. The system measures the delay time between when the power reception device requests power and when the power transmission device actually transmits power, then uses this pre-measured delay value to compensate for timing issues in subsequent feedback control operations, ensuring stable charging operation.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the charging current and comparing it with a target value. When the charging current deviates from the target, the system calculates a feedback control value based on the deviation and the pre-measured delay time, then adjusts the power transmission accordingly to maintain stable charging operation.
2Adaptability or versatility
If the power reception device moves underwater, then the system provides versatile underwater power supply capability, but the feedback control stability becomes difficult to maintain due to motion-induced variations
Solution Approach 1:
The patent applies dynamics by making the feedback control system adaptive to changing conditions. The system continuously measures the delay time under actual operating conditions (including during device motion) and adjusts the feedback control parameters in real-time based on the measured delay and current deviation, allowing stable operation despite the power reception device moving underwater.
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 system stabilizes the charging of storage batteries by effectively managing operating delays in the feedback control system, ensuring reliable power transmission and reception even when the load is moving underwater.
Implementation Method 1
a power transmission coil configured to transmit electric power to the power reception device via a magnetic field
Data Source
AI summary
A power transmission device includes a power transmission coil, and a power transmission side processor. A power reception device includes a power reception coil receiving electric power from the power transmission coil, a power reception power supply charging the storage battery based on the received electric power and general-purpose power supply components, a power reception side processor periodically controlling a charging current to the storage battery, and a current sensor detecting the charging current. When a value of the charging current is outside a predetermined range, the power reception side processor calculates a feedback control parameter to the power transmission power supply based on a difference between the value of the charging current and a target current value, and transmits the feedback control parameter to the power transmission side processor. The power transmission side processor controls electric power from the power transmission power supply based on the feedback control parameter.