Climate Control DC Load Synchronization to Reduce Ripple Current
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Solution Overview
Problem
Climate control systems in transport face instability due to asynchronous parallel loads, leading to unstable ripple current demands and reduced battery charging efficiency.
Innovation Solution
Implementing a feedback-based load control system that synchronizes power supply to DC components by determining a synchronization pattern for asynchronous parallel loads, using phase angle control to phase-cancel peak current demands, thereby stabilizing the power system and enhancing battery charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If asynchronous parallel loads are supplied power independently, then each DC component can operate autonomously, but unstable ripple current demands occur and battery charging efficiency decreases
Solution Approach 1:
The patent merges multiple asynchronous DC load power supplies into a synchronized parallel configuration. The controller coordinates the switching operations of multiple DC-DC converters, making them operate in unison rather than independently, which combines their output currents constructively and reduces ripple effects on the battery charging system.
Solution Approach 2:
The patent implements periodic switching control for DC-DC converters operating in discontinuous conduction mode. By synchronizing the switching cycles and phase angles of multiple converters, the system creates a coordinated periodic action pattern that eliminates random ripple currents and stabilizes the total current demand on the battery.
2Productivity
If multiple DC components operate in discontinuous DC format, then power can be supplied efficiently to each component, but unstable ripple current demands destabilize the power system
Solution Approach 1:
The patent applies periodic switching control to DC-DC converters operating in discontinuous conduction mode. By synchronizing the switching cycles and phase angles of multiple converters, the system creates a coordinated periodic action pattern that eliminates random ripple currents while maintaining the efficiency benefits of discontinuous operation.
Solution Approach 2:
The patent changes the operating parameters of DC-DC converters by adjusting their switching frequencies and phase angles. This parameter coordination transforms the individual discontinuous current waveforms into a synchronized pattern where the ripple components cancel each other out, stabilizing the total current while preserving discontinuous operation efficiency.
3Reliability
If phase angle control is implemented for synchronization, then stable power supply is achieved, but control system complexity increases
Solution Approach 1:
The patent implements a feedback control mechanism where the controller monitors the operating states of multiple DC-DC converters and adjusts their switching phase angles accordingly. This feedback loop automatically synchronizes the converters and maintains stable power supply, reducing the need for complex manual coordination while achieving reliable synchronization.
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 effectively stabilizes the power system and increases battery charging efficiency by synchronizing power supply to DC components, reducing unstable ripple current demands and preventing power shortages, ensuring efficient operation within safety boundaries.
Implementation Method 1
the embodiments described herein can synchronize the asynchronous parallel loads by implementing phase angle control of the asynchronous parallel loads
Implementation Method 2
synchronize the asynchronous parallel loads by implementing phase angle control of the asynchronous parallel loads. Accordingly, unstable ripple current demands from two or more of the asynchronous parallel loads of the climate control system can be eliminated in order to stabilize the overall power system
Data Source
AI summary
Methods and systems for feedback-based load control of a climate control system while in transport are provided. The method can include monitoring a current demand from each of a plurality of DC components of the climate control system. The method can also include determining whether the current demand for two or more of the plurality of DC components is in a discontinuous DC format. Also, the method can include, when two or more of the plurality of DC components is in the discontinuous DC format, determining a synchronization pattern for supplying power to the two or more of the plurality of DC components. Further, the method can include a DC power source of the climate control system directing power to the two or more of the plurality of DC components in the discontinuous DC format based on the synchronization pattern.