Battery Charge Controller Starting Circuit and Bank Switching
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Solution Overview
Problem
Battery charging systems using renewable energy sources face inefficiencies due to the intermittent nature of these sources and the need for battery charge controllers to have electrical power to operate, leading to challenges in recharging depleted batteries, especially in remote locations where battery charging functionality can be lost.
Innovation Solution
A charge controller with a starting circuit that allows the processing unit to be powered directly from the power source, enabling operation even when battery voltages are insufficient, and a processing unit that manages the charging of multiple battery banks by switching between them based on voltage and duty cycle optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charge controller uses the battery banks to power the processing unit, then the system operates normally during charging, but the charge controller cannot start when the batteries are completely depleted
Solution Approach 1:
A capacitor is introduced as an intermediary energy storage element between the power source and the processing unit. The capacitor can accumulate sufficient energy directly from the power source to boot up the processing unit, even when battery voltage is insufficient. This intermediary allows the system to overcome the startup problem under depleted battery conditions.
Solution Approach 2:
The capacitor performs preliminary energy accumulation from the power source before the processing unit needs to operate. By charging the capacitor in advance when power is available, the system ensures sufficient energy is stored to initiate the processing unit even when batteries are depleted, enabling the charging process to begin.
2Ease of operation
If the charge controller requires sufficient battery voltage to operate, then the processing unit can function normally, but charging cannot begin when batteries are completely depleted
Solution Approach 1:
The capacitor serves as a mediator that decouples the startup requirements of the processing unit from the battery voltage levels. It accumulates energy directly from the power source, allowing the processing unit to start independently of battery charge state, thus enabling automatic charging initiation even from depleted batteries.
Solution Approach 2:
The power delivery path is segmented into two independent pathways: one through the capacitor for processing unit startup, and another through the charging circuit for battery charging. This segmentation allows the processing unit to be powered without requiring the batteries to provide sufficient voltage, separating the startup function from the charging function.
3Productivity
If multiple battery banks are charged simultaneously, then all batteries receive power, but voltage disparities between battery banks increase
Solution Approach 1:
The charging system dynamically switches between different battery banks based on their voltage states. Rather than charging all batteries simultaneously at fixed rates, the controller monitors voltage levels and alternates which battery bank receives charging power, maintaining voltage uniformity while achieving overall charging productivity.
Solution Approach 2:
The charging process uses periodic switching between battery banks rather than continuous simultaneous charging. The controller cycles through different battery banks in a periodic manner, allowing each to charge when selected while maintaining voltage balance across the system, thus preserving stability while achieving charging goals.
Data Source
AI summary
A battery charge controller is configured to optimize battery charging from a power source, particularly a renewable power source like a photovoltaic panel. The battery charge controller includes a processing unit that intelligently switches between battery banks being charged to maximize electrical power applied to charging and help maintain even battery bank voltages. The battery charge control can also include a starting circuit allowing electrical power to be applied directly to the processing unit from the power source when the battery bank banks are too depleted to power on the processing unit to commence battery charging.