Vehicle Alternator Synchronous Rectification Fault Management
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Solution Overview
Problem
Synchronous rectification alternators for motor vehicles face significant cost and reliability challenges due to the high proportion of electronics, which can lead to substantial after-sales service costs and reduced machine reliability, especially with extended warranty periods.
Innovation Solution
Incorporating fault detection and management means within the alternator to identify and respond to faults in the synchronous rectification electronics, including detection of battery connection reversals and overheating, using phase signals and control signals to regulate voltage and protect the system, thereby reducing the risk of damage and extending the lifespan of the alternator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If synchronous rectification with power transistors is used, then rectification efficiency is improved, but the proportion of electronics cost increases to 30-50% of total machine cost
Solution Approach 1:
The patent implements fault detection means that continuously monitor the synchronous rectification electronics before failures occur. By detecting faults early through monitoring voltage signals and transistor states, the system can take preventive actions to avoid catastrophic failures, thereby protecting the high-value electronics investment and reducing after-sales service costs.
2Loss of energy
If synchronous rectification with power transistors is used, then rectification efficiency is improved, but reliability of the machine decreases due to higher electronics failure risk
Solution Approach 1:
The patent implements a feedback mechanism where fault detection means continuously monitor the state of synchronous rectification electronics and provide fault information to the voltage regulation means. This closed-loop feedback system enables real-time monitoring and early detection of degradation, allowing the system to respond to maintaining reliability despite the presence of fragile electronics.
Solution Approach 2:
The fault detection system performs preliminary monitoring of electronics health before failures occur. By detecting early signs of malfunction in the synchronous rectification transistors and associated electronics, the system can take preventive measures to avoid complete failures, thereby maintaining high reliability despite using complex electronic components.
3Loss of energy
If electronics proportion is increased for synchronous rectification, then after-sales service costs increase due to expensive component replacement
Solution Approach 1:
The patent implements preliminary fault detection and monitoring that identifies problems in the synchronous rectification electronics before they lead to complete failures. By detecting faults early through monitoring voltage signals and transistor states, the system enables timely maintenance interventions that prevent catastrophic failures, thereby avoiding expensive after-sales service operations and reducing the impact of high electronics content on total cost of ownership.
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
The solution enhances the overall reliability and reduces the likelihood of costly failures by providing real-time fault detection and protection mechanisms, allowing for timely correction of issues such as battery connection reversals and overheating, thus minimizing downtime and maintenance costs.
Implementation Method 1
synchronous rectification means for rectifying into a DC voltage the alternating voltages supplied by the stator
Implementation Method 2
voltage regulation means for regulating the DC voltage
Implementation Method 3
fault detection means for detecting faults in the synchronous rectification means and supplying fault detection information to the voltage regulation means
Implementation Method 4
opening of an excitation circuit supplying current to an excitation coil of the rotor
Data Source
AI summary
A synchronous rectification alternator for a motor vehicle is disclosed. The alternator includes a stator, a rotor, and a synchronous rectification system for rectifying into a DC voltage the alternating voltages supplied by the stator, and a voltage regulator for regulating the DC voltage. The alternator also includes fault detection for detecting faults in the synchronous rectification and supplying fault detection information to the voltage regulator. In one version, the fault information is supplied to the voltage regulator at fault inputs also receiving phase signals representing the alternating voltages supplied by the stator. At least one of the items of fault information is used to cause, in the voltage regulator, opening of an excitation circuit supplying current to an excitation coil of the rotor so as to produce, in the voltage regulator, a fault indication. The opening of the excitation circuit is preferably caused through a suitable command of a fast demagnetization transistor included in the excitation circuit.