Switched-Capacitor Power Circuit for Balanced Battery Charging
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Solution Overview
Problem
Conventional multi-battery charging and discharging systems face challenges in balancing charging and discharging processes, leading to reduced charging speed and endurance capability due to unbalanced voltage and current distribution among batteries connected in series, resulting in energy loss and reduced battery life.
Innovation Solution
A power system incorporating an inductive voltage conversion circuit, switched capacitor circuits, and a control circuit that dynamically adjusts voltage and switch states to charge batteries in parallel, allowing for flexible charging and discharging methods to balance voltage and current distribution, ensuring balanced charging and discharging of batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If batteries are connected in series to supply power to the load, then the output voltage meets the load requirement, but the charging current is limited by the weakest battery and charging speed is reduced
Solution Approach 1:
The patent segments the battery system into multiple independently controllable battery packs, each with its own charging path through switched capacitor circuits. This allows each battery to be charged independently at its optimal rate rather than being constrained by the weakest link in a series connection.
Solution Approach 2:
The patent implements dynamic switching between different charging modes (series connection for power supply, parallel connection for charging) and within parallel charging between individual battery packs. The control circuit dynamically adjusts switch states based on battery status to optimize both voltage output and charging speed.
2Stress or pressure
If batteries are connected in series for power supply, then voltage requirement is met, but unbalanced charging occurs and some batteries are undercharged
Solution Approach 1:
The patent divides the battery system into separate chargeable units with individual control circuits and switched capacitor circuits for each battery pack. This segmentation enables independent monitoring and charging of each battery, ensuring balanced charging regardless of their individual states.
Solution Approach 2:
The control circuit continuously monitors the voltage and charging status of each battery pack and dynamically adjusts the switching states of the capacitor circuits accordingly. This feedback mechanism ensures that each battery receives appropriate charging current to maintain balance across all batteries.
3Stress or pressure
If a buck circuit is used to step down voltage from series batteries, then load operating condition is met, but energy loss increases and endurance capability is reduced
Solution Approach 1:
The patent enables the battery system to directly supply power to the load in series connection mode when voltage requirements are met, without requiring external buck conversion circuits. The switched capacitor circuits can also function in reverse to step down voltage when needed, utilizing the system's own components rather than external energy-consuming converters.
Solution Approach 2:
The switched capacitor circuits are designed to perform multiple functions: charging batteries in parallel mode, stepping down voltage when series connection voltage is too high, and enabling direct series power supply when appropriate. This multi-functionality eliminates the need for dedicated buck circuits and reduces energy loss.
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 improves battery charging speed and service life by ensuring balanced charging and discharging, enhancing the overall endurance capability of electronic devices by optimizing battery management.
Implementation Method 1
inductive voltage conversion circuit
Implementation Method 2
switched capacitor circuit
Data Source
AI summary
A power system, includes a first switch, a second switch, a first switched capacitor circuit, a second switched capacitor circuit, an inductive voltage conversion circuit, an input end, a first charging end, and a second charging end. An input side of the inductive voltage conversion circuit is coupled to the input end. An output side of the inductive voltage conversion circuit is coupled to the first charging end through the first switch, and is coupled to the second charging end through the second switch. The first switched capacitor circuit is coupled between the input end and the first charging end. The second switched capacitor circuit is coupled between the input end and the second charging end.