Electrical Module String With Reversible DC/DC Charge Balancing
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Solution Overview
Problem
Existing power supply circuits for rotary electric machines face challenges in balancing the discharge of energy storage units and efficiently powering loads requiring higher voltages, as conventional DC/DC converters are costly and energy-consuming for voltage conversion between low and high voltage levels.
Innovation Solution
A string of electrical modules with isolated and reversible DC/DC converters and a control unit that manages energy transfer between modules, allowing for balanced discharge and charging of energy storage units, and connecting loads with different voltage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional DC/DC converters are used for voltage conversion between low voltage (3-60V) and high voltage (400-1000V) electrical energy storage units, then voltage conversion capability is achieved, but infrastructure cost and energy consumption increase significantly
Solution Approach 1:
The system segments the electrical energy storage into multiple modules, each with its own DC/DC converter capable of voltage conversion. This allows individual modules to operate independently at different voltage levels, eliminating the need for a single complex infrastructure to handle voltage conversion between low and high voltage systems.
Solution Approach 2:
The DC/DC converters are designed with multi-functionality to handle both low voltage (3-60V) and high voltage (400-1000V) operations within the same module. This universal design allows the same hardware infrastructure to serve multiple voltage requirements, reducing overall system complexity and cost.
2Stability of the object's composition
If smart control of switches is implemented to ensure equitable discharging of energy storage units, then discharge balance is improved, but control complexity increases
Solution Approach 1:
The control system implements feedback mechanisms that continuously monitor the state of charge and discharge levels of each energy storage unit. Based on this feedback, the switch control signals are dynamically adjusted to maintain equitable discharging across all modules, preventing any single unit from being over-discharged or under-utilized.
Solution Approach 2:
The switch control strategy employs dynamic adjustment of switching patterns and duty cycles based on real-time operational conditions. This allows the system to adaptively balance the discharge of energy storage units while responding to changing load demands and state of charge levels, maintaining stability without requiring overly complex static control logic.
3Loss of energy
If isolated and reversible DC/DC converters are used in all modules, then energy transfer efficiency between modules is improved, but manufacturing cost increases
Solution Approach 1:
The system employs homogeneous isolated and reversible DC/DC converters in all modules, using identical circuit topologies and component specifications. This standardization simplifies the manufacturing process by enabling mass production of identical converter units, reducing per-unit costs despite the advanced technology required for isolation and reversibility functions.
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 enhances energy transfer efficiency, extends autonomy by balancing charge states, and reduces infrastructure costs by enabling seamless voltage conversion and load powering without intermediate terminals.
Implementation Method 1
the windings of the primary and secondary circuits being coupled so as to form a transformer
Data Source
AI summary
String of modules for an electrical circuit including a first terminal and a second terminal. Each module includes a primary terminal and a secondary terminal, with the primary terminal being connected to the secondary terminal of another module and/or the secondary terminal being connected to the primary terminal of another module. An electrical energy storage unit and an H-switching bridge are provided. The bridge includes two switching arms having two controllable switches disposed on either side of a midpoint, each midpoint being connected to one of the terminals of the module, the electrical energy storage unit being disposed in a branch parallel to the switching arms. At least one module includes a DC/DC converter, including controllable switches, connected, to terminals of the electrical energy storage unit and to a tertiary terminal and to a quaternary terminal of the module. At least one DC/DC converter is an isolated and reversible converter.