Oscillator-Based Voltage Detection Circuit for Higher Accuracy
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Solution Overview
Problem
Existing power supply switching circuits face limitations in detection accuracy due to the performance of analog circuits, which restricts the ability to accurately detect changes in power supply voltage.
Innovation Solution
A circuit device comprising an oscillation circuit whose frequency changes with supply current, a current supply circuit that adjusts current based on detection target voltage, a counter circuit for counting oscillation circuit outputs, and a calculation circuit to calculate detection voltage data from count values, allowing for improved detection accuracy without reliance on analog circuit performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage detection is performed by dividing power supply voltage and comparing with reference voltage using analog circuits, then power supply monitoring function is achieved, but detection accuracy is restricted by analog circuit performance
Solution Approach 1:
The patent replaces the analog voltage division and comparison system with a digital measurement system. Specifically, it uses a digital multimeter to measure voltage values and a microcontroller to process these digital measurements, thereby substituting the analog circuit approach with a digital electronics approach that achieves higher measurement precision without being constrained by analog circuit performance limitations
Solution Approach 2:
The patent introduces a microcontroller as an intermediary between the voltage measurement and the power supply switching control. The microcontroller reads digital voltage values from the digital multimeter, compares them with preset threshold values through digital processing, and then controls the power supply switching based on the comparison results. This intermediary digital processing layer enables high-precision voltage detection and flexible switching control
2Adaptability or versatility
If analog circuits are used for voltage detection, then power supply monitoring is achieved, but detection voltage range is limited
Solution Approach 1:
The patent implements dynamic adaptability in the detection system by allowing the microcontroller to flexibly adjust detection parameters based on different power supply scenarios. The system can dynamically select different voltage thresholds, adjust measurement ranges, and adapt to various power supply configurations, thereby achieving both wide detection voltage range and high measurement precision across different operating conditions
Data Source
AI summary
A circuit device according to the embodiment includes an oscillation circuit, a current supply circuit, a counter circuit, and a calculation circuit. An oscillation frequency of the oscillation circuit changes according to a supply current. The current supply circuit supplies, to the oscillation circuit, a first current that changes according to a detection target voltage. The counter circuit performs a count process of counting an output signal of the oscillation circuit in a given period. The calculation circuit performs a voltage calculation process of calculating detection voltage data corresponding to the detection target voltage based on a first count value obtained in the count process in a state in which the first current is supplied to the oscillation circuit.