Power Regulating Circuit Using Charge-Current Feedback Against Overcharge
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Solution Overview
Problem
Conventional power regulating circuits and charging devices do not effectively prevent overcharge of lithium batteries, leading to reduced battery lifetime and potential risks such as swelling, deformation, or explosion.
Innovation Solution
A power regulating circuit with a detecting module, control module, and actuating module that detects the charge current and adjusts the power supply mode to prevent overcharge by distinguishing between trickle charge, constant voltage, and constant current ranges and controlling the power transmission state accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the power regulating circuit continuously provides power transmission to the lithium battery, then the convenience of use is improved, but the battery lifetime is reduced due to overcharge
Solution Approach 1:
The power regulating circuit continuously monitors the charge current flowing to the lithium battery and uses this feedback information to dynamically adjust the power transmission state. When the detected charge current falls within the first current threshold range (indicating full charge), the circuit automatically transitions to a power-off state, preventing overcharge while maintaining user convenience.
Solution Approach 2:
The power regulating circuit dynamically switches between different operational states (power transmission state and power-off state) based on real-time charge current detection. This dynamic adjustment allows the system to adapt to the battery's charging status, providing continuous power when needed and automatically stopping when full, thus resolving the contradiction between convenience and battery protection.
2Duration of action of stationary object
If the power regulating circuit detects charge current and adjusts power transmission state, then the battery lifetime is extended, but the device complexity increases
Solution Approach 1:
The power regulating circuit performs self-monitoring and self-adjustment by detecting the charge current and automatically transitioning between power transmission and power-off states. This self-service capability protects the battery without requiring external intervention or complex external control systems, extending battery lifetime while keeping the overall system relatively simple.
Solution Approach 2:
The detection function and power control function are merged into a single integrated power regulating circuit. The same circuit that regulates power transmission also detects the charge current and makes control decisions, eliminating the need for separate detection and control systems, thus reducing overall device complexity while still extending battery lifetime.
3Object-affected harmful factors
If the power regulating circuit is set to power-off state when charge current is in the first current threshold range, then overcharge is prevented, but the power supply reliability is reduced
Solution Approach 1:
The power regulating circuit periodically detects the charge current and switches between power transmission and power-off states based on the detected values. When the charge current enters the first current threshold range, the circuit transitions to power-off state to prevent overcharge. This periodic monitoring and switching mechanism prevents overcharge while maintaining power supply reliability through automated control.
Data Source
AI summary
A power supply mode setting method is provided, with said method including: in a detection time period, controlling the power regulating circuit in a power transmission state, and detecting a charge current to obtain a detected value; determining in which one of a TC range, a CV range and a CC range the detected value locates; adjusting the power regulating circuit to a power off state for a first duration when the detected value is in the TC range; keeping the power regulating circuit in the power transmission state for a second duration when the detected value is in the CV range; and keeping the power regulating circuit in the power transmission state for a third duration when the detected value is in the CC range. A power regulating circuit and a charging device adapting said method are also provided.