Voltage Detection Circuit Time-Division Multiplexing
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Solution Overview
Problem
Existing voltage detection circuits in microcontrollers can only detect internal voltage drops and are unable to monitor external input voltage drops, leading to potential system malfunctions when the power supply voltage drops, as they require additional comparators to detect both internal and external voltage drops, increasing chip area and complexity.
Innovation Solution
A voltage detection circuit that uses a comparison voltage selection circuit, a detection object selection circuit, a reference voltage generation circuit, and a comparator to monitor both external input voltage and power supply voltage by time division, allowing a single comparator to detect both voltage drops without increasing circuit scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple comparators are used to detect both internal and external voltage drops, then detection capability is improved, but chip area and circuit complexity increase
Solution Approach 1:
The patent merges the functions of multiple comparators into a single comparator by implementing time-division multiplexing. The detection object selection circuit switches between internal voltage and external voltage inputs, allowing one comparator to sequentially perform detection tasks that would traditionally require separate comparators, thereby reducing chip area while maintaining comprehensive voltage detection capability
Solution Approach 2:
The patent employs periodic switching of the detection object selection circuit to alternate between monitoring internal voltage and external voltage. This periodic action enables a single comparator to continuously detect both voltage types through time-division multiplexing, achieving the reliability of multiple comparators with the area efficiency of one
2Area of stationary object
If a single comparator is used for both internal and external voltage detection, then chip area is reduced, but detection precision and reliability may deteriorate
Solution Approach 1:
The patent introduces dynamic switching capability through the detection object selection circuit, which can flexibly select between internal voltage and external voltage as the detection target. This dynamic reconfiguration allows the single comparator to adaptively monitor different voltage sources, maintaining detection reliability while achieving area reduction
Solution Approach 2:
The single comparator is designed with universal functionality to handle both internal voltage detection and external voltage detection tasks. The comparison voltage generation circuit and detection object selection circuit enable this universal comparator to perform multiple detection functions that would traditionally require specialized dedicated comparators, ensuring reliability across different detection scenarios
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
Enables the detection of both power supply and external input voltage drops using a single comparator, preventing system malfunctions while maintaining a reduced circuit size and complexity.
Implementation Method 1
a comparator that compares the reference voltage and the comparison voltage, and outputs the comparison result as a detection signal
Data Source
AI summary
A voltage detection circuit including a voltage selection circuit that outputs a voltage commensurate with a power supply voltage as a first voltage; a detection voltage selection circuit that selects either an external input voltage inputted from an external terminal or the first voltage according to a first control signal, and outputs it as a comparison voltage; a reference voltage generation circuit that generates a reference voltage; a comparator that compares the reference voltage and the comparison voltage, and outputs the comparison result as a detection signal; a control circuit that generates the first control signal so that the detection voltage selection circuit may output either the first voltage or the external input voltage as the comparison voltage by time division, and when a variation of the first voltage is detected, generates the first control signal so that the detection object selection circuit may output the first voltage as the comparison voltage.