Parallel Converter Power Supply with Dynamic Charge Distribution
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Solution Overview
Problem
Existing power supply systems with multiple batteries face challenges in achieving balanced charging and discharging characteristics, leading to premature battery limits and increased costs due to the use of boost/buck DC-DC converters, which can result in overcharging during regenerative charging if not properly managed.
Innovation Solution
A power supply system with a first and second converter connected in parallel, a switching device to selectively connect storage devices to the converters, and a control device that calculates and manages discharge and charge distribution ratios to prevent overcharging and balance battery usage, ensuring that no single battery reaches its limit before others.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If batteries are uniformly charged and discharged, then balanced SOC is achieved, but one battery may reach charge/discharge limit earlier than others, reducing overall system capability
Solution Approach 1:
The control device dynamically adjusts the charge/discharge distribution ratios based on real-time SOC states of individual batteries. Instead of uniform charging/discharging, the system varies the current distribution parameters to match each battery's capacity and state, allowing all batteries to contribute optimally without any reaching limits prematurely.
2Reliability
If boost/buck DC-DC converter is provided in each power stage, then power control is improved, but cost increases significantly
Solution Approach 1:
The patent merges multiple converter functions into a single converter configuration. Instead of having separate boost/buck DC-DC converters in each power stage, one converter performs multiple functions by selectively connecting to different batteries through switching devices, thereby reducing component count and cost while maintaining power control capability.
Solution Approach 2:
The converter is designed with multi-functionality to serve multiple batteries and operate in different modes (charging, discharging, regenerative braking) without requiring dedicated converters for each function. The switching device enables the single converter to adaptively connect to different batteries based on system requirements.
3Device complexity
If switching device selectively connects batteries to converter, then cost is reduced, but overcharging may occur during regenerative charging
Solution Approach 1:
The control device continuously monitors the SOC state of each battery and uses this feedback to dynamically adjust the charge distribution ratios during regenerative charging. This closed-loop control prevents overcharging by reducing or stopping charge current to batteries that are approaching their charge limits while directing charge current to batteries with lower SOC.
4Productivity
If electric power is distributed to multiple batteries, then charging/discharging capability is improved, but control complexity increases
Solution Approach 1:
The control device manages complexity by dynamically adjusting charge/discharge distribution parameters based on real-time battery states. The system calculates optimal distribution ratios that balance the contribution of each battery, allowing improved charging/discharging capability while keeping control logic manageable through parameter-based adaptation rather than complex switching sequences.
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 system provides balanced charging and discharging characteristics, prevents overcharging, and optimizes battery usage by selectively switching storage devices, thereby extending the overall system's charging and discharging capabilities.
Implementation Method 1
first converter and second converter which are connected in parallel with each other to the power line
Data Source
AI summary
A discharge distribution ratio calculating unit calculates a discharge distribution ratio, according to the ratio between an amount of electric power allowed to be discharged from a first storage device connected to a first converter, and the sum of amounts of electric power allowed to be discharged from second and third storage devices. A charge distribution ratio calculating unit calculates a charge distribution ratio, according to the ratio between an amount of electric power with which the first storage device is allowed to be charged, and an amount of electric power with which the storage device electrically connected to the second converter by a switching device is allowed to be charged. Then, the first and second converters are controlled according to the discharge distribution ratio in a discharge mode, or according to the charge distribution ratio in a charge mode.