Smart Switch Undervoltage Cutoff Based on Load Current
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Solution Overview
Problem
In applications where multiple electrical loads share a power supply, a defective load drawing high current can cause a voltage drop affecting other loads, leading to malfunctions or failures, and existing smart switches require complex monitoring systems to detect and address these issues.
Innovation Solution
A smart switch circuit that includes a control circuit and under-voltage/over-current detection mechanisms, where the under-voltage threshold and current thresholds are dynamically adjusted based on load current, allowing for automatic switch-off without the need for external monitoring, mimicking the behavior of a conventional fuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external monitoring systems are used to detect voltage drops and over-current states, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The smart switch performs self-monitoring of voltage drops and over-current states using its own internal circuits. The control circuit directly detects supply voltage levels and load current conditions without requiring external monitoring devices, thereby achieving accurate measurement while maintaining simple device architecture
Solution Approach 2:
The voltage detection and current monitoring functions are merged into the smart switch's control circuit. By integrating these monitoring capabilities within the switch itself rather than using separate external systems, the patent achieves comprehensive measurement precision while reducing overall system complexity
2Ease of operation
If fixed voltage thresholds are used for switch-off decisions, then ease of operation is improved, but adaptability decreases
Solution Approach 1:
The smart switch uses dynamic threshold adjustment where the voltage threshold for switch-off decisions is not fixed but adapts based on operating conditions. The control circuit dynamically determines appropriate thresholds based on the specific application requirements, allowing the system to maintain simple operation while adapting to different voltage conditions and load characteristics
3Reliability
If smart switches are used to replace conventional fuses, then reliability is improved through controlled switch-off, but device complexity increases due to supplemental circuitry
Solution Approach 1:
The smart switch achieves reliable power supply protection through self-monitoring capabilities built into the control circuit. By automatically detecting over-current states and voltage drops and triggering appropriate switch-off actions, the device provides robust protection while keeping the overall system simple through integrated rather than external monitoring solutions
Solution Approach 2:
The smart switch combines multiple functions including current switching, over-current protection, and voltage drop detection within a single device. This multi-functionality provides comprehensive reliability improvement while avoiding the need for multiple separate components that would increase system complexity
Data Source
AI summary
In accordance with an embodiment, a circuit for driving an electronic switch includes a control circuit configured to trigger a switch-on and a switch-off of the electronic switch in accordance with an input signal, wherein the control circuit is further configured to trigger the switch-off of the electronic switch in response to an under-voltage signal signaling an under-voltage state; and an under-voltage detection circuit configured to signal the under-voltage state when a supply voltage received at a supply node is below an under-voltage threshold value, wherein the under-voltage threshold value depends on a load current passing through the electronic switch.