Dual Active Bridge UPS Circuit With Integrated Battery Charging
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Solution Overview
Problem
Existing uninterruptible power supplies (UPS) require multiple electrical components, including a UPS circuit and an electric charger, which increases costs and reduces efficiency, necessitating a solution to minimize these components while maintaining power supply functionality.
Innovation Solution
A dual active bridge converter with integrated DC voltage source and inductors allows energy exchange between AC electrical networks and the DC voltage source, eliminating the need for a separate electric charger by using the DC voltage source for temporary energy storage and charging, and controlling energy exchanges through phase differences and control units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate electric charger is used to charge the DC voltage source, then the DC voltage source can be recharged from the AC electrical network, but the number of electrical components increases and efficiency decreases
Solution Approach 1:
The patent combines the charger and UPS circuits into a single integrated system. The dual active bridge converter performs both charging and power supply functions using shared components (transformer, capacitors, switches), eliminating the need for separate charger and UPS circuits while maintaining reliability.
Solution Approach 2:
The dual active bridge converter is designed to perform multiple functions: it can charge the DC voltage source from the AC network, supply power to the AC electrical system from the DC source, and provide bidirectional energy flow. This multi-functional design reduces component count while maintaining system reliability.
2Reliability
If a separate electric charger is used to charge the DC voltage source, then the DC voltage source can be recharged from the AC electrical network, but energy efficiency decreases due to separate conversion processes
Solution Approach 1:
By merging the charger and UPS into a single dual active bridge converter, the patent eliminates redundant energy conversions. The integrated circuit allows direct bidirectional energy transfer between AC and DC sides, reducing losses associated with separate rectification and inversion stages.
Solution Approach 2:
The integrated circuit enables continuous bidirectional energy flow between the AC network and DC voltage source. Energy can be transferred efficiently in both directions without interruption or redundant conversion steps, maximizing energy utilization and minimizing losses.
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 configuration enhances efficiency by integrating charging into the UPS, reduces component count, and improves power supply reliability and flexibility, enabling bidirectional energy exchange and network storage capabilities.
Implementation Method 1
a transformer comprising a primary and a first secondary; i. the first electrical branch comprises a first inductor connected in series with said primary; ii. the second electrical branch comprises a second inductor connected in series with said first secondary
Data Source
AI summary
An uninterruptible power supply circuit in the form of a dual active bridge converter includes first terminals which are configured to be connected to a first AC electrical network, second terminals which are configured to be connected to a second AC electrical network, and third terminals which are configured to be connected to a DC voltage source, the uninterruptible power supply circuit further comprising a transformer comprising a primary and a first secondary, a first electrical branch comprising the primary, the first electrical branch being connected to a first switch circuit configured to make it possible to exchange energy with the first terminals via the primary, and a second electrical branch comprising the first secondary, the second electrical branch being connected to a second switch circuit configured to make it possible to exchange energy with the second terminals via the first secondary. The first electrical branch comprises a first inductor connected in series with the primary, the second electrical branch comprises a second inductor connected in series with the first secondary, the transformer further comprises a second secondary, a third switch circuit being connected to the second secondary and being configured to make it possible to exchange energy with the third terminals via the second secondary, so as to make it possible to exchange energy between the first AC electrical network and the DC voltage source and between the DC voltage source and the second AC electrical network.