Method and system for feedback-based load control of a climate control system in transport
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Solution Overview
Problem
Transport refrigeration systems face instability due to asynchronous parallel loads causing unstable ripple current demands, which can lead to power shortages and inefficient battery charging in climate control systems during transport.
Innovation Solution
Implementing a feedback-based load control system that monitors current demands from DC components and synchronizes power supply using phase angle control to stabilize power systems and enhance battery charging efficiency by coordinating power requirements among asynchronous parallel loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If asynchronous parallel loads are used in climate control system, then device complexity is reduced, but power system stability deteriorates due to unstable ripple current demands
Solution Approach 1:
The patent implements periodic action by using phase angle control to periodically modulate the switching of parallel loads. The controller adjusts the phase angle of each load's switching cycle to distribute peak current demands across different time intervals, converting the unstable asynchronous operation into a controlled periodic pattern that stabilizes the power system while maintaining the simplicity of parallel load architecture
2Productivity
If multiple DC components operate simultaneously, then productivity of climate control functions is improved, but energy loss increases due to battery depletion and power shortages
Solution Approach 1:
The patent applies preliminary action by having the controller pre-coordinate the switching schedules of multiple DC components before they operate. By calculating and setting appropriate phase angles in advance, the system prepares the power distribution pattern to avoid simultaneous peak demands, thereby preventing power shortages and optimizing battery charging efficiency before the actual loading occurs
Data Source
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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.