AUV Power Source Assembly Using Super-CAPs for High-Current Loads
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies face challenges in powering high current low impedance devices like Controlled Source Electromagnetics (CSEM) transmitters from Autonomous Underwater Vehicles (AUVs) in deep waters, as custom high current rate battery packs are expensive and traditional power sources result in high power losses and heavy demands on AUV batteries.
Innovation Solution
A power source assembly for AUVs using high-capacity capacitor modules (Super-CAPs) and DCDC converters, configured to supply high currents efficiently by discharging capacitors during one phase and recharging from AUV batteries during another, with components housed in pressure-resistant units to withstand deep water conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If custom high current rate battery packs are developed and produced, then high current supply capability is improved, but manufacturing cost increases significantly
Solution Approach 1:
The power source is divided into two separate battery packs: a first battery pack optimized for high current discharge (using NiCd or NiMH chemistry) and a second battery pack optimized for energy storage (using Li-ion chemistry). This segmentation allows each battery type to be manufactured using standard, cost-effective processes while collectively providing the required high current capability without needing expensive custom high current rate battery packs.
Solution Approach 2:
The system uses a composite battery architecture combining two different battery chemistries (NiCd/NiMH and Li-ion) with complementary characteristics. The first battery pack provides high current discharge capability while the second provides energy storage, creating a composite power source that achieves both high power and cost-effectiveness through the synergistic combination of standard-manufactured battery types.
2Use of energy by moving object
If DCDC converter is used to step up current from battery to device, then power transfer is enabled, but power losses increase significantly (70% for high power DCDC)
Solution Approach 1:
The system accepts that DCDC conversion losses are inevitable but converts this challenge into a benefit by using the first battery pack's high discharge capability to directly supply the CSEM device during active transmission, bypassing the need for high-power DCDC conversion during the most demanding operational phases. The DCDC converter is only used during lower-power charging phases, minimizing overall energy losses.
Solution Approach 2:
The system operates in periodic cycles alternating between high-current discharge mode (where the first battery pack directly powers the CSEM device) and charging mode (where the DCDC converter charges the second battery pack at lower power levels). This periodic operation minimizes the time the high-loss DCDC converter is active, reducing overall power losses while maintaining power transfer capability when needed.
3Adaptability or versatility
If umbilical connection is used for power supply, then deep water operation is enabled, but operational complexity and cost increase
Solution Approach 1:
The system extracts the power supply function from the surface ship by equipping the AUV with self-contained dual battery packs that provide all necessary power for high-current CSEM operations. This extraction eliminates the need for umbilical connections entirely, allowing deep water operation while reducing operational complexity and enabling fully autonomous deployment.
Solution Approach 2:
The AUV is made self-sufficient in power supply through the dual battery pack system, with the first battery pack providing high current discharge capability and the second providing energy storage. This self-service capability allows the AUV to operate independently in deep water without umbilical connections, reducing operational complexity while maintaining deep water adaptability.
4Power
If high current discharge is required from single battery pack, then power capability is improved, but battery weight and size increase significantly
Solution Approach 1:
The power source is segmented into two specialized battery packs: a first compact battery pack (NiCd or NiMH) optimized for high current discharge with small capacity, and a second battery pack (Li-ion) optimized for energy storage. This segmentation allows the high current capability to be achieved with a smaller first battery pack than would be required if a single battery pack had to provide both high current and extended duration power, reducing overall weight and volume.
Solution Approach 2:
Each battery pack is designed with local quality optimized for its specific function: the first battery pack uses NiCd or NiMH chemistry with high discharge rates and compact design for high current applications, while the second uses Li-ion chemistry for efficient energy storage. This specialized local optimization allows the high current discharge function to be achieved with minimal weight and size in the first battery pack, as it only needs to handle peak power demands rather than total energy requirements.
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
Enables efficient and cost-effective operation of high current low impedance devices in deep waters without umbilicals, reducing power losses and extending AUV battery life, while allowing flexible and adaptable power supply configurations.
Implementation Method 1
a high-current capacity module based on capacitor technology, such as Super-CAPs, may provide sufficient current rates at desired voltage for driving the high current low impedance devices
Implementation Method 2
the high current supply module may further comprises: a DCDC converter coupled to the AUV battery pack or the AUV and/or auxiliary battery pack
Data Source
AI summary
The disclosure relates to a power source assembly for powering high current low impedance devices from an Autonomous Underwater Vehicle, AUV, battery pack and/or auxiliary battery packs, comprising: one or more high current low impedance devices, a high current power source, wherein the high current low impedance device is powered by the high current power source, one or more AUVs, the one or more AUVs comprising an AUV and/or auxiliary battery pack, and the high current power sources, the high current low impedance device further comprising a high current supply module comprising an electronic circuit adapted to: supply a current from the AUV battery pack or AUV and/or auxiliary battery pack, store the supplied power in the high current power source, and supply high current to a connected high current output device.The disclosure further relates to a method for maintaining the power source assembly and a system for a powering the high current low impedance devices.