Modular Chassis Power Conversion Card Placement
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Solution Overview
Problem
The existing modular packet switch/router designs face challenges in scaling due to thick copper power planes, which complicate dielectric filling, increase board thickness, and lead to inefficiencies in cooling and redundancy, particularly with DC/DC power converters being placed after logic components, leading to reduced efficiency and potential shutdowns.
Innovation Solution
A novel power distribution design where power conversion cards are placed behind the backplane, generating logic voltages for line cards, eliminating the need for primary power planes on line cards and allowing for separate cooling, redundancy, and efficient power delivery, with sharing mechanisms enabling one power conversion card to supply multiple line cards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If DC/DC power converters are placed after logic components on line cards, then the power conversion function is integrated, but cooling efficiency is reduced and shutdown risk increases
Solution Approach 1:
The patent inverts the conventional placement order by positioning power conversion cards before logic components in the cooling airflow path. This ensures that power converters receive cooler air first, improving their cooling efficiency and preventing thermal shutdowns while maintaining functional integration.
2Power
If thick copper power planes are used for power distribution, then power delivery capability is improved, but board thickness increases and dielectric filling becomes complex
Solution Approach 1:
The patent extracts the power conversion function from line cards and places it in separate power conversion cards. This eliminates the need for thick copper power planes within line cards, simplifying dielectric filling while maintaining power delivery capability through dedicated power cards with optimized power distribution.
Solution Approach 2:
The patent segments the power distribution system into separate power conversion cards that handle primary-to-logic voltage conversion externally. This separation allows line cards to use simpler, thinner power planes while power conversion cards concentrate the heavy copper routing needed for high-power handling, reducing overall system complexity.
3Reliability
If power conversion cards are placed behind the backplane, then cooling efficiency and redundancy are improved, but the power distribution path is extended
Solution Approach 1:
The patent merges multiple power conversion cards onto a single backplane structure, allowing them to share common cooling infrastructure and control resources. This consolidation improves reliability through redundancy while minimizing the overall power distribution path length by keeping all conversion cards closely integrated with the backplane.
Data Source
AI summary
A modular packet network device has a chassis in which multiple logic cards mate to the front side of an electrical signaling backplane. Logic power for the logic cards is supplied from a group of power converter cards that convert primary power to the logic voltages required by the logic cards. The power converter cards lie in a separate cooling path behind the backplane. Advantages achieved in at least some of the embodiments include removing primary power planes from the signaling backplane or portion of the backplane, providing redundant, upgradeable power modules whose individual failure does not cause logic card failure, and providing cool air to power converter circuits that would be subject to only heated air if located on the logic cards. Other embodiments are also described and claimed.