Battery Charge Control with Zero-Amp Voltage Stabilization
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Solution Overview
Problem
Existing battery test devices struggle with maintaining terminal voltage accuracy during battery charge control due to fluctuations after reaching a set voltage value, necessitating improved control methods.
Innovation Solution
A battery test device and method utilizing a full-bridge circuit with duty-ratio controlled switching elements, transitioning through constant current, constant voltage, zero amp, and minute discharge controls to accurately maintain terminal voltage at a set value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If constant current/constant voltage control is used to charge the battery, then the battery can be charged to the set voltage value, but the terminal voltage fluctuates over time and cannot be maintained with high accuracy
Solution Approach 1:
The control method dynamically transitions between four distinct control modes (constant current, constant voltage, zero amp, and minute discharge control) based on real-time battery state monitoring. This dynamic adaptation allows the system to respond to voltage fluctuations and maintain high accuracy terminal voltage control throughout the charging process, resolving the contradiction between achieving set voltage and maintaining stability.
Solution Approach 2:
The system continuously monitors terminal voltage and charging current, using this feedback information to determine when to transition between control modes. The feedback mechanism enables the control unit to detect voltage fluctuations and adjust the control strategy accordingly, ensuring high accuracy voltage maintenance while addressing the instability issue of conventional constant current/constant voltage control.
2Quantity of substance
If the charging current period is extended to charge the battery, then the battery charging capacity increases, but the control complexity increases to maintain voltage accuracy
Solution Approach 1:
The charging process is segmented into four distinct control modes, each optimized for specific charging stages. This segmentation allows the system to manage complex control requirements by breaking them down into manageable, sequential control phases, reducing overall control complexity while maintaining voltage accuracy and achieving full battery charging capacity.
Solution Approach 2:
The control system changes operating parameters (current level, voltage level, duty ratio) at different charging stages to optimize both charging capacity and control simplicity. By adjusting parameters according to the charging state, the system achieves high accuracy voltage control without requiring overly complex control mechanisms throughout the entire charging process.
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 enables precise control of battery charging and discharging, ensuring the terminal voltage is maintained at the set value with high accuracy by adjusting current and voltage levels.
Implementation Method 1
a bidirectional DC-DC converter using a full-bridge circuit in which four switching elements are bridge-connected... ON/OFF of each of the switching elements of the bidirectional DC-DC converter is duty-ratio controlled by a control unit
Data Source
AI summary
Constant current charge control for supplying a charging current of a set current value to a battery by duty-ratio control for a full-bridge circuit is executed. When the voltage between terminals of the battery rises to a set voltage value during the constant current charge control, the constant current charge control is stopped and constant voltage charge control for supplying the charging current to the battery to maintain the voltage between the terminals at the set voltage value is executed. When the charging current drops to zero during the constant voltage charge control, the constant voltage charge control is stopped and zero amp control for maintaining the charging current at zero is executed. When the voltage between the terminals rises above the set voltage value during the zero amp control, the zero amp control is stopped and minute discharge control is executed.