Charge Circuit Dynamic Timer Adjustment for Battery Safety
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Solution Overview
Problem
Existing charge circuits for secondary batteries often stop charging prematurely due to fixed timer settings, leading to insufficient battery charging, and increasing timer settings compromises safety.
Innovation Solution
A charge circuit that includes a current limiting circuit, a charge control circuit to manage transistors for variable charge current, and a timer that adjusts charging time based on the charge current, ensuring safe and complete battery charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the clock number in the charge timer is increased to extend the charging period, then the battery charge completeness is improved, but the safety protection capability deteriorates
Solution Approach 1:
The charge timer dynamically adjusts the clock number based on the charge current magnitude. When charge current decreases (indicating battery nearing full charge), the clock number is reduced to extend charging duration. When charge current is high, the clock number is increased to limit charging time for safety. This dynamic adjustment resolves the contradiction by making the timer adaptable to real-time charging conditions.
Solution Approach 2:
The system changes the parameter of clock number in the charge timer based on charge current levels. The charge control circuit modifies the clock number parameter dynamically: increasing it when current is high to prioritize safety, and decreasing it when current is low to ensure complete charging. This parameter change strategy allows the system to optimize both safety and charging completeness at different charging stages.
2Productivity
If the charge current is increased to speed up charging, then the charging speed is improved, but the risk of overheating and safety issues worsens
Solution Approach 1:
The charge control circuit periodically monitors the charge current and adjusts the charging process accordingly. By continuously checking current levels and modifying the clock number in the charge timer, the system creates a periodic control loop that maintains high charging speeds when safe and reduces speed when temperature or current levels indicate potential hazards, thus resolving the contradiction between speed and safety.
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 charge circuit dynamically adjusts charging time according to changes in charge current, preventing premature termination and ensuring full battery charge while maintaining safety.
Implementation Method 1
a second transistor configured to output a current proportional to the charge current flowing through the first transistor
Data Source
AI summary
A charge circuit includes a current limiting circuit configured to limit a current input from an input terminal; a first transistor connected between an output terminal of the current limiting circuit and a secondary battery; a charge control circuit configured to turn the first transistor on and off to start and stop supply of a charge current to the secondary battery; a second transistor configured to output a current proportional to the charge current flowing through the first transistor; and a charge timer configured to generate clock pulses according to the current output from the second transistor. The charge control circuit is configured to turn off the first transistor to stop the supply of the charge current to the secondary battery when the number of the clock pulses reaches a predetermined number.