Dual-Active-Bridge Converter Layout for Common-Mode Noise Cancellation
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Solution Overview
Problem
Existing switched-mode converters face limitations in operating at high switching frequencies due to significant electromagnetic interference and common-mode currents, which are exacerbated by the use of asymmetrical control and require cumbersome and costly common-mode filters.
Innovation Solution
A dual-active-bridge converter system is employed, where two converters are coupled via switch sets and controlled in opposition, reducing common-mode noise by compensating noise generated between the converters, allowing for high-frequency operation without additional control circuit modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If switched-mode converters operate at high switching frequencies, then productivity is improved, but electromagnetic interference increases
Solution Approach 1:
The patent combines two dual-active-bridge converters into a single system with shared input and output terminals. The converters are controlled in opposition, meaning their switching actions are coordinated to produce opposite current waveforms. This merging approach allows the harmful electromagnetic emissions from one converter to be cancelled by the other, enabling high switching frequencies without excessive interference.
Solution Approach 2:
The control system预先 coordinates the switching of both converters to generate opposite common-mode currents. By anticipating the electromagnetic interference that would normally occur at high switching frequencies, the system proactively generates counteracting currents that cancel the harmful emissions before they propagate outward.
2Adaptability or versatility
If asymmetrical control is used in switched-mode converters, then adaptability is improved, but common-mode currents increase
Solution Approach 1:
The control system预先 coordinates the switching of both converters to generate opposite common-mode currents. By anticipating the electromagnetic interference that would normally occur at high switching frequencies, the system proactively generates counteracting currents that cancel the harmful emissions before they propagate outward.
Solution Approach 2:
The patent converts the harmful common-mode currents generated by asymmetrical control into a beneficial cancellation mechanism. By deliberately generating equal and opposite common-mode currents from the second converter, the system transforms what would normally be harmful emissions into a self-cancelling phenomenon, turning the harm into a benefit.
3Object-generated harmful factors
If common-mode filters are added to reduce electromagnetic interference, then harmful factors are reduced, but device complexity increases
Solution Approach 1:
The converter system performs its own electromagnetic interference mitigation through the coordinated operation of its two converters. The system is self-sufficient in canceling its own common-mode emissions through opposition control, eliminating the need for external common-mode filters and their associated complexity.
Data Source
AI summary
The present disclosure relates to a switching supply system including at least a pair of dual-bridge converters (DAB1, DAB2), wherein: first H-bridge switches of the converters are coupled, in parallel or series, to two terminals (12, 14) for applying a first voltage (Vin), second H-bridge switches of the converters being coupled, in parallel or series, to two terminals (16, 18) for supplying a second voltage (Vout), and the switches of the converters (DAB1, DAB2) are controlled in opposition from one converter to the other.