Terminal Current Detection Circuit for Multi-Output Burnout Protection
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Solution Overview
Problem
In power supply apparatuses with multiple output terminals, increasing the size of the terminal block to handle high currents leads to thick wiring and processing difficulties, and there is a risk of burnout due to current concentration and incorrect connections.
Innovation Solution
A terminal protection voltage detector circuit is implemented, comprising current detectors, comparators, and a current stop circuit, which monitors and compares output currents to prevent overcurrent by stopping the current flow when thresholds are exceeded, thereby preventing burnout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the terminal block size is increased to handle high output currents, then the current handling capability is improved, but the wiring becomes thick and processing becomes difficult
Solution Approach 1:
The patent divides the output current monitoring into separate detection circuits for each output terminal (S1, S2, S3, S4). Each terminal has its own current detection resistor and comparison circuit, allowing independent monitoring and control of current at each terminal. This segmentation enables precise current management without requiring oversized terminal blocks.
2Power
If the terminal block size is increased to handle high output currents, then the current handling capability is improved, but the wiring becomes thick
Solution Approach 1:
The patent implements separate current detection for each output terminal using individual detection resistors (R1, R2, R3, R4) and dedicated comparison circuits. This allows the system to handle high total current through multiple thin wires rather than requiring a single thick wire, as each terminal's current is independently monitored and controlled.
3Productivity
If the wiring is divided into each load to divide output current, then the current distribution is improved, but if a load is short-circuited, the output current concentrates on that terminal and wiring may burn out
Solution Approach 1:
The patent employs feedback control through comparison circuits that continuously monitor the current at each output terminal and compare it against a predetermined threshold. When the current exceeds the threshold (indicating a short circuit or erroneous connection), the comparison circuit outputs a signal to stop current flow, preventing wiring burnout. This feedback mechanism ensures reliable operation even when loads are divided across multiple terminals.
4Reliability
If current monitoring is implemented for each output terminal, then the burnout risk is eliminated, but the device complexity increases
Solution Approach 1:
The patent uses segmented current detection with separate detection resistors and comparison circuits for each output terminal. While this does increase component count, the modular structure allows for systematic implementation and maintenance. Each terminal has its own protection circuit, providing reliable burnout prevention through distributed monitoring rather than a single complex centralized system.
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 solution effectively detects and prevents burnout risks at each output terminal, ensuring safe operation without significantly increasing the mounting area, even under high current conditions.
Implementation Method 1
a current detector configured to detect a plurality of output currents flowing from the power supply apparatus to a plurality of loads via a plurality of output terminals
Implementation Method 2
the first comparator configured to compare a sum of the plurality of detected output currents with a predetermined first threshold and output a first comparison result signal when the sum of the plurality of output currents is larger than or equal to the first threshold
Implementation Method 3
the second comparator configured to compare a maximum value of the plurality of detected output currents with a predetermined second threshold and output a second comparison result signal when the maximum value is equal to or larger than the second threshold
Data Source
AI summary
A terminal protection voltage detector circuit is provided for protecting a terminal block having output terminals in a power supply apparatus. A current detector detects output currents flowing from the power supply apparatus to loads via output terminals, and a first comparator configured to compare a sum of the detected output currents with a predetermined first threshold and output a first comparison result signal when the sum of output currents is larger than or equal to the first threshold. A second comparator configured to compare a maximum value of detected output currents with a predetermined second threshold and output a second comparison result signal when the maximum value is equal to or larger than the second threshold. A current stop circuit stops a current from flowing from the power supply apparatus to the output terminals based on the first or second comparison result signal.