Power Converter Control for Solar Charging and Battery Merging
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Solution Overview
Problem
Conventional power conversion systems become large due to the separate placement of first and second storage batteries, which supply power to auxiliary equipment and vehicles respectively.
Innovation Solution
A control method for a power converter that utilizes a second power conversion circuit to convert voltage at a capacitor connection terminal based on the output voltage of a solar cell module, allowing the output power to be used effectively without the need for a separate second storage battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate second storage battery is provided for supplying power to auxiliary equipment, then the reliability of power supply to auxiliary equipment is improved, but the system size increases
Solution Approach 1:
The patent merges the function of the second storage battery (for auxiliary equipment) with the first storage battery (for vehicle power) by using a single battery unit. The control device manages power distribution from this unified battery to both the inverter for vehicle power and the auxiliary equipment, thereby eliminating the need for a separate second battery and reducing overall system size while maintaining power supply reliability.
Solution Approach 2:
The first storage battery is designed to serve multiple functions: it acts as both the primary power source for the vehicle (through the inverter) and the power source for auxiliary equipment. This multi-functional design allows a single battery to replace what would traditionally require two separate battery systems, thus reducing system size without compromising the reliability of power supply to auxiliary equipment.
2Adaptability or versatility
If the output voltage of the solar cell module is low, then the adaptability to varying solar conditions is improved, but the charging efficiency of the battery decreases
Solution Approach 1:
The control device dynamically adjusts operating parameters (such as voltage and current) based on the actual output voltage of the solar cell module. When the solar cell output voltage is low, the controller modifies the charging parameters to optimize power transfer efficiency, thereby maintaining effective charging despite varying solar conditions. This parameter adaptation resolves the contradiction by allowing the system to accept diverse solar inputs while minimizing energy loss during charging.
3Adaptability or versatility
If a first storage battery is provided separately from the second storage battery, then the power management flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent employs a single first storage battery that performs multiple power management functions: supplying power to the inverter for vehicle operation, providing power to auxiliary equipment, and being charged from the solar cell module. The control device manages these diverse functions through intelligent power distribution algorithms, achieving the power management flexibility of separate batteries without the structural complexity of multiple physical battery units.
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
This approach prevents an increase in system size by efficiently using the output power from the solar cell module to charge the battery, even when the output voltage is low, thereby maintaining system compactness.
Implementation Method 1
output power from the solar cell module
Implementation Method 2
second power conversion means for converting output power from the first storage battery
Data Source
AI summary
The present invention is related to a control method for controlling a power converter including a first power conversion circuit 11 and a second power conversion circuit 12 by using a control circuit 13. The first power conversion circuit 11 is connected to a solar cell module 1 and a capacitor 2, converts output power of the solar cell module 1, and outputs the converted power to the capacitor 2, the second power conversion circuit 12 is connected to the capacitor 2, and converts a voltage at a connection terminal connected to the capacitor 2. The control method comprises step of controlling operation of the second power conversion circuit 12 based on the output voltage of the solar cell module 1, to use output power of the second power conversion circuit 12 for charging the capacitor 2.