AC Linked Power Converter Cell Balancing Ripple Removal
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Solution Overview
Problem
Existing AC linked power converting apparatuses face challenges in stabilizing power output from renewable energy sources due to unstable voltage and current, leading to inefficiencies and increased costs from separate cell balancing and ripple removal circuits, including the use of short-lived high-capacity electrolytic capacitors.
Innovation Solution
An AC linked power converting apparatus that integrates a cell balancing charger/discharger and a ripple removing capacitor between the inverter and power converters, eliminating the need for electrolytic capacitors by bidirectionally or unidirectionally balancing charging and discharging operations and removing ripples, thereby reducing costs and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-capacity electrolytic capacitor is used for removing ripples of direct current voltage at a DC link, then the ripple removal function is achieved, but the product life becomes short and costs increase
Solution Approach 1:
The patent combines the cell balancing charger/discharger and the ripple removing circuit into a single integrated device. The charger/discharger performs both cell balancing operations and ripple removal functions simultaneously, eliminating the need for separate high-capacity electrolytic capacitors and extending product life while maintaining effective ripple removal.
Solution Approach 2:
The charger/discharger is designed to perform multiple functions: cell balancing (charging and discharging individual cells) and ripple removal from the DC link voltage. This multi-functional approach replaces the traditional separate ripple removal capacitor, reducing component count and extending system reliability.
2Reliability
If separate cell balancing circuit and ripple removing circuit are used, then each function is performed independently, but costs and volume of the product increase
Solution Approach 1:
The patent integrates the cell balancing charger/discharger and the ripple removing circuit into a single unified device. This integration reduces product volume and component count while maintaining both functions, as the same hardware infrastructure serves dual purposes without compromising functional independence.
3Reliability
If separate cell balancing circuit and ripple removing circuit are used, then each function is performed independently, but costs and efficiency deteriorate
Solution Approach 1:
The patent combines the cell balancing charger/discharger and the ripple removing circuit into a single integrated device. This integration reduces component count, assembly complexity, and manufacturing costs while maintaining both functions, making the product more cost-effective to produce.
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 solution enables balanced charging and discharging of serially connected cells without electrolytic capacitors, reducing costs, size, and improving efficiency and reliability by using low-capacity capacitors with extended life, effectively stabilizing power output from renewable energy sources.
Implementation Method 1
a ripple removing capacitor that is positioned between the cell balancing charger/discharger and the inverter and that includes a first terminal and a second terminal that are respectively connected to a first output terminal and a second output terminal of the cell balancing charger/discharger so as to remove ripples of the direct current voltage
Data Source
AI summary
Disclosed herein is an alternating current linked power converting apparatus, including: a direct current power unit including a plurality of cells, which provide a direct current (DC) voltage and are connected in series, wherein the direct current power unit has both ends connected to an inverter which converts the direct current voltage to an alternating current (AC) voltage; a cell balancing charger/discharger connected to the plurality of cells and balancing the direct current voltage or an amount of charging between the plurality of cells; and a ripple removing capacitor that is positioned between the cell balancing charger/discharger and the inverter and that includes a first terminal and a second terminal that are respectively connected to a first output terminal and a second output terminal of the cell balancing charger/discharger so as to remove ripples of the direct current voltage.