Variable Frequency DC/DC Converter Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing interlaced multi-phase converters in the automotive industry operate at fixed frequencies, leading to issues with emission standards, power output limitations, and difficulty in synchronizing variable frequency converters over an extended range, which results in poor performance and potential shutdowns.
Innovation Solution
A synchronizing device that receives switching signals from converters, detects transition types, generates synchronization signals, and delivers them sequentially to maintain synchronization across the entire operating frequency range of variable frequency DC/DC converters, preventing forced shutdowns and reducing ripple current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fixed frequency operation is used, then EMI emissions are concentrated on a narrow spectrum, but filters are required to meet EMI standards and power output is limited
Solution Approach 1:
The patent applies dynamics by transitioning from fixed frequency operation to variable frequency operation. The control device varies the switching frequency of the DC/DC converters dynamically, allowing the system to adapt frequency based on operating conditions. This dynamic approach spreads EMI emissions across a broader spectrum and enables operation at higher duty cycles beyond 50%, thereby increasing power output without requiring additional filtering complexity.
2Stability of the object's composition
If fixed frequency interlaced converters are used, then phase-lock loop stability is maintained, but a minimum control duty cycle of 1% is required, consuming at least a few amperes current load
Solution Approach 1:
The patent applies parameter changes by varying the switching frequency of the DC/DC converters rather than maintaining a fixed frequency. The control device adjusts frequency parameters dynamically, allowing the system to operate at duty cycles above 50% without requiring a minimum 1% duty cycle. This parameter variation enables lower current load consumption while maintaining system stability through adaptive frequency control.
3Adaptability or versatility
If variable frequency converters are synchronized using digital devices, then synchronization over extended frequency ranges is achieved, but the operating frequency range is very limited and complex systems are required
Solution Approach 1:
The patent applies the intermediary principle by introducing a dedicated control device that acts as a mediator between multiple DC/DC converters. This control device receives switching signals from each converter, detects transition types, generates synchronization signals, and delivers them to converters in sequence. This intermediary approach enables synchronization over an extended frequency range (4 kHz to 40 kHz) without requiring complex digital calculation systems, as the control device manages frequency coordination through a structured signal delivery mechanism.
4Reliability
If synchronization devices are used for variable frequency converters, then synchronization is achieved, but total shutdown of all converters occurs when the device fails
Solution Approach 1:
The patent applies segmentation by providing each DC/DC converter with its own dedicated synchronization interface and control path. The control device delivers synchronization signals to converters individually in sequence rather than using a centralized control mechanism. This segmented approach ensures that if one converter or its synchronization path fails, other converters can continue operating independently, preventing total system shutdown and maintaining productivity while preserving synchronization capability for operational units.
Data Source
AI summary
The invention concerns a device (3) for synchronizing at least two DC/DC converters. It is characterized in that it comprises receiving means (21A, 21B, 23A, 23B) for receiving a switching signal generated by each of the converters; means (25) for detecting a transition type of the received switching signals; means (27) for generating a synchronization signal when a transition is detected; and means (27, S1, S2) for supplying the synchronization signal to one of the converters, said means (27, S1, S2) being configured to supply the synchronization signal to a different converter and in an order of succession each time a transition is detected.