Voltage Regulator Input Switching to Mitigate Error Amplifier Aging
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Solution Overview
Problem
Conventional automotive voltage regulators experience accelerated aging due to maintaining high voltage levels across input terminals, leading to reduced accuracy and robustness, particularly during normal operation states.
Innovation Solution
Incorporation of aging mitigation circuitry in voltage regulators, utilizing a comparator and switches to dynamically adjust the voltage differential across input terminals of an error amplifier, reducing the voltage to a lower level during normal operation and reconnecting to the feedback path during voltage regulation, thereby mitigating amplifier aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage levels are maintained across input terminals during normal operation, then voltage regulation accuracy is preserved, but aging of the error amplifier accelerates
Solution Approach 1:
The patent implements dynamic switching between two operational modes: a first mode during normal operation where a predefined voltage is applied across the error amplifier inputs to reduce stress and aging, and a second mode during voltage regulation where the feedback path is reconnected to maintain accurate voltage control. This dynamic adaptation resolves the contradiction by adjusting operating conditions based on system needs.
Solution Approach 2:
The patent changes the voltage parameter across the error amplifier input terminals based on operational state. During normal operation, a reduced predefined voltage is applied to minimize aging effects. During voltage regulation events, the voltage parameter is changed by reconnecting the feedback path, allowing accurate voltage control while limiting the duration of high-stress conditions.
2Reliability
If voltage regulator operates in normal mode with reduced voltage across error amplifier inputs, then aging is mitigated, but voltage regulation response time increases
Solution Approach 1:
The patent employs periodic switching between operational modes based on voltage monitoring. The system continuously monitors battery voltage and periodically transitions between the aging-mitigation mode and the voltage regulation mode as needed. This periodic action allows the system to spend most time in the protective low-voltage mode while rapidly switching to high-performance mode when regulation is required.
Solution Approach 2:
The patent applies a predefined voltage level during normal operation that is optimized to reduce aging effects before voltage regulation events occur. This preliminary protective action prepares the error amplifier for extended operation while maintaining the capability for rapid transition to accurate voltage control when needed, effectively pre-conditioning the system for both longevity and performance.
Data Source
AI summary
The present disclosure relates to a voltage regulator that includes an error amplifier having a first output, a first non-inverting input, and a first inverting input, wherein the error amplifier is configured to generate a signal based on a first voltage at the first non-inverting input and a second voltage at the first inverting input, and circuitry coupled to the error amplifier and to an output of the voltage regulator. The circuitry may be configured to in a first mode, cause a voltage to be applied between the first inverting input and the first non-inverting input of the error amplifier at a predefined voltage level and, in a second mode, cause the first inverting input of the error amplifier to be coupled to a first reference voltage source, and the first non-inverting input of the error amplifier to be coupled to the output of the voltage regulator.