DC Bus Battery Coupling Without DC/DC Conversion Loss
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Solution Overview
Problem
Existing DC coupling power systems require multiple DC/DC converters, leading to increased operational power consumption, complex control logic, higher costs, and energy losses due to power conversion, as well as increased space requirements.
Innovation Solution
A DC coupling power system that omits DC/DC converters, utilizing an AC/DC converter to directly connect to a battery module and DC coupled charger, with a control unit to manage operation modes based on load and energy levels, avoiding additional converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If DC/DC converters are installed in a DC coupling power system, then power conversion can be performed, but operation power increases and energy loss occurs
Solution Approach 1:
The patent removes the DC/DC converter from the system architecture. The battery module is directly connected to the DC bus, eliminating the intermediate power conversion stage. This extraction of the unnecessary component resolves the contradiction by maintaining power delivery capability while eliminating the energy loss and operation power consumption associated with DC/DC conversion.
Solution Approach 2:
The patent introduces a control unit as a mediator that manages power flow directly between the AC/DC converter, battery module, and DC coupled charger. This control mechanism enables intelligent power distribution without requiring additional power conversion hardware, thus avoiding the energy losses inherent in DC/DC converters while maintaining system flexibility.
2Adaptability or versatility
If multiple DC/DC converters are installed, then power conversion flexibility is improved, but control logic becomes complicated
Solution Approach 1:
By removing the DC/DC converters and their associated control systems, the patent dramatically simplifies the control logic while maintaining adaptability through the control unit that manages direct DC power flow. The complexity of coordinating multiple DC/DC converters is eliminated.
Solution Approach 2:
The control unit serves multiple functions: it manages battery charging/discharging, controls the DC coupled charger, and regulates power flow from the AC/DC converter. This single multi-functional control element replaces what would have been multiple specialized controllers for separate DC/DC converters, simplifying the overall control architecture.
3Power
If DC/DC converters are added to the system, then power conversion capability is enhanced, but system cost and installation space increase
Solution Approach 1:
The patent eliminates the DC/DC converter components entirely, removing the associated costs of hardware procurement, manufacturing, installation, and maintenance. The direct connection architecture reduces both equipment cost and installation space requirements while maintaining essential power conversion capability through the AC/DC converter alone.
4Power
If DC/DC converters are used for power conversion, then DC power can be converted to different voltage levels, but energy loss rate increases
Solution Approach 1:
By removing the DC/DC converter, the patent eliminates the energy loss inherent in second-stage power conversion. The battery module's direct connection to the DC bus allows it to operate at its native voltage level, avoiding the conversion losses that would occur in a DC/DC converter while still enabling flexible power delivery through control management.
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
Saves operation power, simplifies control logic, reduces energy loss, and decreases system costs and space requirements by eliminating DC/DC converters.
Implementation Method 1
an AC/DC converter, configured to convert an AC voltage into a first DC voltage and provide the first DC voltage and a supply power to a DC bus
Data Source
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AI summary
A DC coupling power system receives an AC voltage from an AC power source and includes an AC/DC converter, a battery module, a DC coupled charger and a control unit. The AC/DC converter is configured to convert the AC voltage into a first DC voltage, and provide the first DC voltage and a supply power to a DC bus. The battery module is directly connected to the DC bus. The DC coupled charger receives the first DC voltage and provides a load power to charge a load. The control unit is configured to determine an energy of the battery module and compare the load power and a contracted demand capacity to set the AC/DC converter in one of a plurality of modes.