Modular Battery Switching for Direct Polyphase and DC Supply
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Solution Overview
Problem
Existing power supply systems for stand-alone battery-powered systems face energy loss issues due to the need for both an inverter to convert DC to AC and a DC/DC converter to supply multiple voltage devices, which increases energy consumption.
Innovation Solution
A power supply system comprising multiple modules with a set of cells, a polarity switchover circuit, a selection circuit, and control circuits to generate both DC and polyphase voltages directly from the battery, eliminating the need for an inverter and reducing energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an inverter and DC/DC converter are used to supply both motor and other devices from the battery pack, then the system can provide both polyphase voltage for the motor and DC voltage for other devices, but energy losses increase due to multiple conversion stages
Solution Approach 1:
The patent combines the functions of the inverter and DC/DC converter into a single integrated circuit structure. The same power switches and circuitry are used to generate both polyphase AC voltages for the motor and DC voltages for other devices, eliminating the need for separate conversion stages and reducing energy losses.
Solution Approach 2:
The power conversion circuit is designed to perform multiple functions simultaneously: it generates polyphase AC voltages for the three-phase motor while also providing DC voltages for lighting devices and other peripherals. This multi-functional approach eliminates redundant conversion stages and reduces overall energy consumption.
2Loss of energy
If a switching battery is used to generate polyphase voltage directly, then energy losses are reduced by eliminating the inverter, but the system complexity increases due to the need for multiple control circuits and polarity switchover mechanisms
Solution Approach 1:
The battery pack is divided into multiple modular units, each capable of independent switching and control. This segmentation allows the system to generate polyphase voltages by selectively connecting and disconnecting battery modules, reducing the need for complex centralized control while maintaining energy efficiency.
3Ease of operation
If the battery is separated into three subassemblies for three-phase power supply, then each phase can be independently controlled, but the system becomes bulkier and more expensive when additional DC devices are supplied from all subassemblies
Solution Approach 1:
The patent merges the DC output functions of all three subassemblies into a single common DC output. The same power switches and circuitry used for polyphase AC generation are also used to provide DC voltage for other devices, eliminating the need for separate DC/DC converters for each subassembly and reducing overall system complexity and cost.
Data Source
AI summary
A power supply system adapted to provide a polyphase voltage and a DC voltage and including at least three modules, each module including a set of cells, each cell including at least one elementary power source, the set of cells including a first cell and a second cell, a polarity switching circuit of the module, an output allowing a phase of the power supply system to be generated, the polarity switching circuit being connected to two opposite poles of the two cells, respectively, a selection circuit selecting cells to be connected to the polarity switching circuit, and control circuits connecting two opposite poles of the two cells to a positive and a negative DC voltage output, respectively.