Battery Maintenance System with Phase-Pulse Control
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Solution Overview
Problem
Existing battery charging systems have limitations in achieving high recovery efficiency for different battery states during initial operation, particularly due to the minimum pulse repetition period constraint, which affects the simultaneous operation of thyristor rectifiers and inverters, leading to inefficiencies in charge and discharge cycles.
Innovation Solution
A battery maintenance system that includes a phase-pulse control system synchronized with timer-counters and thyristors to manage forward and reverse currents, allowing for a pause between pulses, thereby aligning the average values of discharge and charge currents, and stabilizing internal battery resistance through multiple stages of charging and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thyristor rectifiers and inverters operate simultaneously with short pulse repetition periods, then battery recovery efficiency is improved, but system reliability deteriorates due to forced locking complexity
Solution Approach 1:
The charging system is divided into separate rectifier and inverter modules, each capable of independent operation. The rectifier handles charging current while the inverter manages regenerative braking energy, allowing them to operate in sequence rather than forcing simultaneous operation with complex coordination
Solution Approach 2:
The system performs preliminary charging through the rectifier before activating the inverter for regenerative energy recovery. This staged approach ensures the battery is ready to accept regenerative energy and avoids the need for complex simultaneous control of both converters
2Speed
If pulse repetition period is reduced for faster charging, then charging speed is improved, but current regulation precision deteriorates
Solution Approach 1:
The system uses periodic PWM control signals with optimized duty cycles to regulate current flow. By carefully designing the pulse width and period ratio, the system achieves both fast charging rates and precise current control through averaged current regulation over each PWM cycle
Solution Approach 2:
Current sensors provide real-time feedback on actual charging current, which is compared with the reference current signal. The controller adjusts the PWM duty cycle dynamically to maintain precise current regulation even at high charging speeds, ensuring the average current matches the desired value
3Manufacturing precision
If multiple charging stages are implemented for battery alignment, then battery maintenance quality is improved, but processing time increases
Solution Approach 1:
The system dynamically transitions between different charging stages based on real-time battery state monitoring. When cells are well-aligned, the system skips unnecessary equalization stages and proceeds directly to fast charging, adapting the maintenance process to the actual battery condition rather than following a fixed multi-stage sequence
Solution Approach 2:
The controller monitors cell voltage and temperature parameters to determine when alignment is sufficient. By changing operational parameters such as PWM duty cycle and charging current based on measured battery state, the system achieves effective alignment without requiring all traditional maintenance stages, reducing overall maintenance time
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
This approach enhances battery recovery efficiency by aligning battery characteristics, reducing internal resistance, and enabling energy recovery from batteries back to the power network, while avoiding the limitations of existing systems by allowing for shorter pulse repetition periods and improved current regulation.
Implementation Method 1
a first timer-counter controlling a first set of rectifier thyristors is synchronized by a first inter-phase voltage, wherein a second timer-counter controlling a second set of rectifier thyristors is synchronized by a second inter-phase voltage
Implementation Method 2
the rectifier and the inverter being connected to a transformer; the transformer being connected to a power supply
Data Source
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AI summary
A method and device is disclosed for charging and/or maintenance of lead-acid and alkaline accumulator batteries, allowing a charge, discharge, or recovery in control-conditioning cycles of these batteries. To increase efficiency of the battery recovery process, its charge is created by a reversible current in consecutive stages. Correction of the charging mode is provided based on voltage and temperature of the accumulator battery.