Power Supply Voltage Monitoring Circuit for Independent Threshold Detection
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Solution Overview
Problem
In modern AC-to-DC power supplies, high-voltage and low-voltage detection circuits are interdependent due to sharing a common voltage division node, making it difficult to adjust threshold values independently.
Innovation Solution
A method and circuit that utilize a voltage division circuit to generate a divided voltage, where a first detection circuit clamps the voltage when it exceeds a clamp threshold, and a second detection circuit detects the input voltage based on the divided voltage, allowing independent adjustment of threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a common voltage division node is shared by high-voltage and low-voltage detection circuits, then circuit cost is reduced, but the threshold values of the two detection circuits become interdependent
Solution Approach 1:
The patent segments the voltage division function by introducing a first voltage division circuit for high-voltage detection and a second voltage division circuit for low-voltage detection. This segmentation allows each detection circuit to have its own independent voltage division path, thereby enabling independent adjustment of threshold values while maintaining cost-effectiveness through shared components where possible.
Solution Approach 2:
The patent introduces a switching circuit as an intermediary between the voltage division circuits and the detection circuits. This switching circuit selectively connects different voltage division circuits to the detection circuits based on the detected voltage level, thereby decoupling the interdependence between high-voltage and low-voltage detection thresholds while maintaining circuit efficiency.
2Ease of operation
If external voltage division circuits are used to adjust threshold values, then threshold adjustment becomes easy, but circuit complexity increases
Solution Approach 1:
The patent merges the voltage division functions for both high-voltage and low-voltage detection into a unified voltage monitoring circuit module. By combining multiple voltage division circuits and switching circuits into one integrated structure, the patent achieves easy threshold adjustment through external voltage division while avoiding the complexity of completely separate external circuits.
Solution Approach 2:
The patent employs a dynamic switching mechanism that automatically selects between different voltage division circuits based on the input voltage level. This dynamic operation allows the circuit to adapt its configuration in real-time, providing easy threshold adjustment capability while maintaining a relatively simple overall circuit structure through automated control.
Data Source
AI summary
The present application provides method and circuit for monitoring a voltage of a power supply, which adopts a divided voltage circuit to obtain a divided voltage from an input voltage of an input power source generated from the power supply, for detecting the input voltage according to the divided voltage by adopting a first detection circuit and a second detection circuit. Also, judging whether the divided voltage is clamped according to a clamp threshold value to determine the first detection circuit or the second detection circuit detecting a detection current and determine another detection circuit detecting the divided voltage. Hereby, the input voltage transmitted from a rectification circuit to the power supply is monitored, and the dependence between the two detection circuits is avoided.