Battery Charger Phase Control for Multiple Batteries
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Solution Overview
Problem
Conventional battery chargers require multiple generators to charge multiple batteries, leading to increased equipment scale and complexity, and struggle to manage charge imbalances and load differences, resulting in inefficient charging and potential electrical losses.
Innovation Solution
A battery charger system utilizing a single 3-phase AC generator that converts AC power to DC and employs a rectification processor with a charge state detector and synchronous signal detector to control charging of multiple batteries independently, ensuring balanced charging through time-division or phase-control methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple generators are provided to charge multiple batteries independently, then each battery can be charged without excess or deficiency, but the number of constituent components and equipment scale increase
Solution Approach 1:
The patent divides the charging control into separate phases for each battery by detecting phase differences between generators. Each battery receives dedicated charging control during specific phases, enabling independent charge management without requiring separate physical generators for each battery.
Solution Approach 2:
The patent implements periodic charging cycles where different batteries are charged in alternating phases. By synchronizing with generator phase differences and periodically switching which battery receives charge, the system achieves independent control of multiple batteries using a single shared generator.
2Device complexity
If a single generator is used to charge multiple batteries, then equipment scale is reduced, but the load on the engine increases and charge imbalance cannot be properly managed
Solution Approach 1:
The patent dynamically adjusts the charging distribution by detecting real-time voltage levels of each battery and the phase differences between generators. The control system continuously modifies which battery receives charge and for how long, enabling adaptive charge balance management that responds to changing battery states and load conditions.
Solution Approach 2:
The patent incorporates voltage detection circuits that continuously monitor each battery's charge state and feed this information back to the control system. This feedback mechanism enables the controller to adjust charging phases and durations to maintain proper charge balance across all batteries despite variations in load and generator output.
3Device complexity
If charge control is based on voltage detection of one battery only, then equipment complexity is reduced, but charge imbalance arises when there is difference in usage state of accessory-system load
Solution Approach 1:
The patent makes the voltage detection circuit universal by having it monitor all batteries simultaneously rather than just one. The detection system serves multiple functions: identifying which batteries need charging, determining charge levels for phase-based control, and providing feedback for charge balance management across the entire battery system.
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 system effectively charges multiple batteries without excess or deficiency, reducing equipment scale, managing charge imbalances, and minimizing electrical losses, while maintaining efficient operation across varying loads.
Implementation Method 1
The battery charger converts the AC power output from the 3-phase AC generator to a direct current (DC) power so as to supply the DC power to the plurality of batteries
Data Source
AI summary
A rectification processor includes rectifier elements that control charge to batteries independently for each of the batteries. A charge-state detector detects charge states of the batteries from their voltages, and determines whether to select the batteries for charging in a half-cycle determined beforehand in accordance with the detected result. A synchronous signal detector detects a signal synchronized with the phase of the 3-phase alternate current (AC) generator from the 3-phase AC generator, and outputs a synchronous signal. A charge controller controls the charge in the rectification processor in synchronization with the 3-phase AC generator according to the synchronous signal from the synchronous signal detector, and, in accordance with the charge states of the batteries output from the charge-state detector, controls charge amounts to the battery/batteries that was determined for selection.