Rotating Machine Power Assembly With Reversible Isolated DC/DC Balancing
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Solution Overview
Problem
Existing systems for supplying power to rotating electric machines in vehicles face challenges in balancing the discharge of energy storage units across modules and ensuring isolated voltage sources for safety, particularly in driving assistance systems and autonomous driving applications.
Innovation Solution
An assembly comprising a string of modules with isolated and reversible DC/DC converters, bidirectional switching cells, and dual power supply buses, allowing energy transfer and voltage balancing between modules, and supporting multiple voltage levels for different electrical loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional DC/DC converters are used in power supply modules, then the system can supply power to electrical loads, but the discharge of energy storage units cannot be balanced between modules and safety isolation requirements cannot be met
Solution Approach 1:
The power supply system is divided into multiple independent modules, each with its own energy storage unit and isolated DC/DC converter. This segmentation allows each module to operate independently while maintaining safety isolation, and enables flexible configuration to balance discharge across modules through the reversible converter capability.
2Reliability
If energy transfer between modules is enabled, then balancing of energy storage units is achieved, but system complexity increases
Solution Approach 1:
The DC/DC converter is designed with bidirectional/reversible capability, allowing it to perform multiple functions: standard power conversion in forward mode and energy transfer in reverse mode. This multi-functionality enables energy balancing between modules without requiring separate dedicated transfer mechanisms, thus limiting the increase in system complexity.
3Adaptability or versatility
If isolated reversible DC/DC converters are used, then energy transfer and voltage balancing are achieved, but manufacturing complexity increases
Solution Approach 1:
The converter design utilizes parameter changes in the switching control to achieve bidirectional operation. By changing the switching sequence and control parameters of the same converter circuit, it can operate in forward mode for power supply or reverse mode for energy transfer, avoiding the need for physically different converter designs and simplifying manufacturing.
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
The solution provides redundant and efficient energy transfer, balancing of energy storage units, and compliance with safety requirements by ensuring isolated voltage sources, extending the operating radius and enhancing system resilience to malfunctions.
Implementation Method 1
An isolated and reversible DC/DC converter is known to be in the form of a circuit having a primary circuit and a secondary circuit, the primary circuit and the secondary circuit having at least one controllable switch and a winding, the windings of the primary and secondary circuits being coupled so as to form a transformer
Data Source
AI summary
Assembly for supplying power to a rotating electric machine for driving a vehicle including at least one string of modules having first and second terminals. Each string includes at least one module having its tertiary and quaternary terminals connected to a first power supply bus and at least one module having its tertiary and quaternary terminals connected to a second power supply bus, the modules of each string being distributed in particular between modules having their tertiary and quaternary terminals connected to the first power supply bus and modules having their tertiary and quaternary terminals connected to the second power supply bus. At least one DC/DC converter of a module of each string is an isolated and reversible converter.