Dynamic Impedance Switching for Overvoltage Protection
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Solution Overview
Problem
Switch devices face damage due to over voltage caused by impedance mismatch during signal transmission, leading to signal reflections and potential damage to the device and connected circuits.
Innovation Solution
A switch device with a detection unit that controls a switch unit and an adjustment switch, using an impedance element to adjust impedance matching by turning on or off the switch unit and adjustment switch based on detected node signals, thereby reducing impedance mismatch and preventing over voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If impedance matching is not considered in switch device design, then device complexity is reduced, but signal reflections occur causing over voltage that damages the switch device and back-end circuit
Solution Approach 1:
The detection unit continuously monitors the node signal before overvoltage damage can occur. When a signal reflection is detected, the system proactively adjusts the impedance by controlling the switch unit and adjustment switch, preventing the harmful overvoltage condition before it damages the device or back-end circuit.
Solution Approach 2:
The patent implements dynamic impedance adjustment by using the detection unit to monitor node signals and automatically controlling the switch unit and adjustment switch to modify the impedance configuration. This dynamic adaptation allows the system to respond to changing signal conditions and maintain proper impedance matching, preventing signal reflections and overvoltage damage.
2Reliability
If a detection unit and dynamic impedance adjustment mechanism are added to the switch device, then over voltage protection is provided, but device complexity increases
Solution Approach 1:
The detection unit automatically monitors the node signal and triggers the impedance adjustment mechanism only when needed. The system serves itself by detecting problematic conditions and autonomously adjusting the impedance configuration through the switch unit and adjustment switch, eliminating the need for external intervention while maintaining protection.
Solution Approach 2:
The detection unit provides continuous feedback by monitoring the node signal for signs of signal reflection or overvoltage conditions. This feedback loop enables the system to detect impedance mismatches and automatically adjust the impedance configuration through the switch unit and adjustment switch, creating a closed-loop control system that maintains reliability without requiring constant external monitoring.
Data Source
AI summary
A switch device includes a first node, a switch unit, an adjustment switch, an impedance element, a second node and a detection unit. A first terminal of the switch unit is coupled to the first node. A first terminal and a second terminal of the adjustment switch are respectively coupled to a second terminal of the switch unit and a reference voltage terminal. A first terminal and a second terminal of the impedance element are respectively coupled to the first terminal and the second terminal of the adjustment switch. The detection unit is coupled to the second node, and a control terminal of the switch unit and a control terminal of the adjustment switch. The detection unit detects a node signal at the second node to accordingly control the switch unit and the adjustment switch.