Power Conversion Shutdown Control via Surge Current Load Detection
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Solution Overview
Problem
Energy storage systems experience continuous power dissipation due to operational power conversion units, even when not connected to a load, leading to battery exhaustion.
Innovation Solution
An energy storage device with a battery module, power conversion circuit, sensing circuit, and control circuit that determines if a load is removed by sensing surge currents during a surge generation period, allowing automatic shutdown to reduce power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power conversion unit continues to operate after load removal, then the system remains ready for immediate power supply, but power dissipation exhausts battery power
Solution Approach 1:
The system performs preliminary actions by lowering the AC output voltage to a preset voltage during a preset period before completely shutting down. This preliminary voltage reduction prepares the system for shutdown while maintaining enough power to detect load presence through surge current sensing, thus resolving the contradiction between readiness and energy conservation.
2Loss of energy
If the system shuts down immediately after load removal, then power loss is reduced, but the system cannot detect whether a load is actually connected
Solution Approach 1:
The system maintains continuous useful action by keeping the power conversion unit operational during the preset period to perform surge current sensing. This continuous operation enables accurate load detection while minimizing power consumption, as the unit only needs to maintain minimal output voltage rather than full power operation.
Solution Approach 2:
The system uses feedback by sensing the surge current at the output terminal and using this information to determine whether to shut down. The sensing circuit provides real-time feedback about load presence, enabling the control circuit to make informed shutdown decisions that balance energy conservation with accurate load detection.
3Reliability
If the AC output voltage is maintained at normal level during preset period, then power supply readiness is ensured, but power consumption increases
Solution Approach 1:
The system applies parameter changes by adjusting the AC output voltage from normal level to a preset lower voltage during the preset period. This voltage parameter change reduces power consumption while maintaining sufficient power for surge current sensing and load detection, thus resolving the contradiction between readiness and energy usage.
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
Accurately determines load removal and automatically turns off the energy storage device, effectively reducing power dissipation and extending battery life.
Implementation Method 1
a power conversion circuit (106), coupled to the battery module (102). The power conversion circuit (106) converts a DC voltage into an AC output voltage
Implementation Method 2
a sensing circuit (108), coupled to the output terminal of the power conversion circuit (106). The sensing circuit (108) senses a current and a voltage of the output terminal of the power conversion circuit (106)
Data Source
AI summary
An energy storage device and a method thereof for supplying power are provided. Control a power conversion circuit to lower an AC output voltage during a preset period to a preset voltage, control the power conversion circuit to change from outputting the preset voltage to outputting a surge voltage, so that the power conversion circuit enters a surge generation period, and determine whether to turn off the energy storage device according to whether an output terminal of the power conversion circuit generating a surge current during the surge generation period.