Remote Sensing Circuit Overvoltage Protection Switch
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-power supply apparatuses experience output voltage reduction due to connectors and wires, and remote sensing technology can exacerbate overvoltage issues when an open fault occurs, leading to potential damage from excessive voltage increases.
Innovation Solution
A remote sensing circuit with a switching unit that opens in normal status and closes in abnormal status, combined with a feedback circuit and remote sensing unit, to prevent output voltage variation and protect against overvoltage and overload, using a BJT or FET switching device to control current flow based on impedance and voltage thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If remote sensing technology is used to compensate for output voltage reduction, then voltage accuracy is improved, but overvoltage risk increases when open fault occurs
Solution Approach 1:
A switching unit is introduced as an intermediary component between the remote sensing unit and the feedback circuit. This switching unit mediates the connection by opening the feedback path when overvoltage is detected, thereby protecting the system while maintaining accurate voltage sensing during normal operation.
Solution Approach 2:
The patent implements a feedback mechanism where the remote sensing unit continuously monitors output voltage and feeds this information to the control unit. The control unit adjusts the switching unit's state based on the feedback signal, creating a closed-loop control system that prevents overvoltage while maintaining voltage accuracy.
2Measurement precision
If remote sensing technology is used, then voltage compensation is improved, but output voltage varies according to load in normal status
Solution Approach 1:
The switching unit dynamically changes its state based on operating conditions. In normal status, it maintains a closed connection allowing accurate voltage sensing and compensation. When load variations cause instability, the switching unit opens the connection to stabilize the output voltage, thus adapting to different operational requirements.
3Reliability
If feedback circuit is added for overvoltage protection, then protection function is improved, but device complexity increases
Solution Approach 1:
The switching unit serves multiple functions: it acts as a connection switch for the remote sensing circuit, an overvoltage protection device, and a load isolation component. By making one component multi-functional, the patent avoids adding separate dedicated components for each function, thus limiting the increase in device complexity.
Data Source
AI summary
A remote sensing circuit and a high-power supply apparatus having the remote sensing circuit. The high-power supply apparatus can include a feedback circuit to feedback power output from a high-power supply unit to an input terminal of the high-power supply apparatus. The remote sensing circuit can include a switching unit connected between an output terminal of the high-power generating unit and the feedback circuit of the high-power supply apparatus to open the connection in a normal status and to close the connection in an abnormal status, a load channel to connect the high-power generating unit and a load, and a remote sensing unit having one terminal commonly connected to the load and the load channel and another terminal commonly connected to the switching unit and the feedback circuit to sense power supplied to the load.