Adaptive Smart Switch Current Limiting for Multi-Load Protection
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Solution Overview
Problem
Conventional switching devices lack adaptive current limiting mechanisms to effectively manage system-wide current distribution and overcurrent conditions, particularly in applications involving multiple loads and varying power supply capacities.
Innovation Solution
A smart switch system comprising multiple switching devices with adaptive current limiting capabilities, where each device adjusts its operation current limit value based on system-wide current indication signals and total current limit values, using resistive devices to convert current signals into voltage signals for threshold voltage adjustments, and prioritizes turn-off sequences during overcurrent events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional switching devices are used without adaptive current limiting, then device simplicity is maintained, but system-wide current distribution cannot be effectively managed and overcurrent conditions cannot be prevented
Solution Approach 1:
The patent combines multiple switching devices into a system where each device integrates current sensing, signal processing, and adaptive current limiting functionality. The switching devices are merged with control circuits that share common pins (IMON, SYSLIM) and coordinate their operation to achieve system-wide current management while maintaining individual device compactness.
Solution Approach 2:
The patent implements feedback mechanisms where each switching device monitors system current through the IMON pin and receives current limit settings through the SYSLIM pin. The devices continuously adjust their current limits based on feedback signals from other devices in the system, enabling adaptive current distribution and overcurrent protection without requiring complex external control circuits.
2Productivity
If multiple switching devices operate with fixed current limits, then device operation is simple, but system-wide current distribution becomes inefficient under varying load conditions
Solution Approach 1:
The patent makes the current limit of each switching device dynamic rather than fixed. Each device continuously adjusts its current limit based on real-time system conditions monitored through the IMON pin and SYSLIM pin. This dynamic adjustment allows the system to optimize current distribution efficiency under varying load conditions while maintaining simple device operation through automated adaptation.
Solution Approach 2:
The patent changes the operating parameters of switching devices by allowing their current limits to vary based on system-wide conditions. The IMON pin provides system current information that triggers parameter changes in each device's current limit, while the SYSLIM pin sets the maximum current limit parameter. This enables efficient current distribution across multiple devices without requiring complex manual configuration.
3Reliability
If switching devices lack current sensing and signal processing capabilities, then device complexity is reduced, but system reliability and overcurrent prevention are compromised
Solution Approach 1:
The patent makes each switching device multi-functional by integrating current sensing, signal processing, and adaptive current limiting capabilities into a single device. The IMON pin serves multiple purposes (system current monitoring, overcurrent detection), the SYSLIM pin provides both current limit setting and system coordination, and the internal circuits perform multiple functions including current sensing, signal amplification, and control logic. This universality enhances system reliability without proportionally increasing overall system complexity.
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 system ensures efficient current distribution, prevents overcurrent damage, and optimally manages power supply by dynamically adjusting current limits and prioritizing device turn-off sequences, enhancing overall system reliability and safety.
Implementation Method 1
using resistive devices to convert current signals into voltage signals for threshold voltage adjustments
Data Source
AI summary
A smart switch system comprising one or more switching devices. Each one of the switching devices include a first pin, a second pin, a current indication pin, a system current limit pin and a power switch for electrically coupling the first pin to the second pin when the power switch is turned on. Each switching device may adaptively adjust an operation current limit value of the switching device based on a system total current limit value received or set at the system current limit pin and a system current indication signal received at the current indication pin.