Common Ground Power System for Multipoint Failure Resilience
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Solution Overview
Problem
Existing power source systems for motor control devices require complex circuit configurations due to separate ground connections for each system, leading to complications such as ground disconnection detection and current limit circuits to prevent ground current flow between abnormal and normal systems.
Innovation Solution
A power source system that connects all systems to a common ground, reducing the need for separate ground patterns and simplifying the circuit configuration by using a single common ground plane connected to multiple nodes, allowing for redundant power sources and independent connectors for each system, thereby maintaining operational integrity even with multipoint failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate ground connections are provided for each system, then ground disconnection detection and current limit protection are improved, but circuit configuration complexity increases
Solution Approach 1:
The patent merges separate ground connections into a common ground structure where multiple systems share a common ground plane and ground potential. This consolidation eliminates the need for separate ground disconnection detection circuits and current limit circuits for each system, while maintaining reliability through the common ground reference.
Solution Approach 2:
The common ground structure serves multiple functions simultaneously: it provides a shared reference potential for all systems, enables ground disconnection detection through a single detection circuit, and prevents ground current flow between systems through the unified ground plane. This multi-functionality reduces overall circuit complexity while maintaining safety and reliability.
2Object-generated harmful factors
If separate ground connections are provided for each system, then ground current isolation is improved, but circuit configuration complexity increases
Solution Approach 1:
The patent combines separate ground connections into a common ground structure that prevents ground current flow between systems through the unified ground plane. The common ground reference ensures that no potential difference exists between systems, eliminating the driving force for ground current while simplifying the circuit configuration.
3Device complexity
If a common ground is used for all systems, then circuit configuration is simplified, but noise leakage between systems may increase
Solution Approach 1:
The patent applies local quality by providing independent connector grounding for each system while maintaining a common ground plane. Each connector is grounded independently to the common ground, which locally isolates noise paths while maintaining the overall common ground reference. This approach simplifies the circuit configuration while preventing noise leakage between systems.
4Reliability
If redundant power sources are implemented, then operational reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple power sources into a common power distribution architecture where redundant power sources share common ground connections and power distribution paths. This consolidation maintains operational reliability through redundancy while simplifying the overall power source configuration by eliminating separate ground and control circuits for each power source.
Data Source
AI summary
In a power source system, circuit units by the number of systems n or more are respectively connected correspondingly to power sources by the number of n (n is an integer of 2 or more). A common ground is all of the circuit units in common. A ground wiring portion establish node-to-node connection between (n+α) pieces of common ground nodes NC(1) to NC(n+α) provided in the common ground and (n+α) pieces of ground plane nodes NP(1) to NP(n+α) provided on a vehicle body in an independent manner, thereby enabling a simple configuration of redundant circuits that can withstand multipoint failures without separating the ground for each system.