Trimmed Voltage Detector Circuit for Low-Cost Accurate Sensing
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Solution Overview
Problem
Current voltage detector devices in electronic devices require high-precision bias circuits or additional correction circuits to account for manufacturing variations in reference voltages, leading to increased circuit costs.
Innovation Solution
A voltage detector device with a trimming mechanism that adjusts input voltages based on a power supply voltage using a reference voltage selection circuit, reset signal generation circuit, and digital circuit to ensure accurate detection without needing high-precision bias or correction circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-precision bias circuit is used to generate a reference voltage, then voltage detection accuracy is improved, but circuit cost increases significantly
Solution Approach 1:
The patent applies preliminary action by performing voltage detection before the system enters normal operation (during power-on or reset state). The detector checks whether voltage has reached a predetermined level before enabling subsequent circuit operations, preventing operational errors due to insufficient voltage without requiring complex real-time monitoring circuits during normal operation.
Solution Approach 2:
The patent extracts the voltage detection function into a dedicated, simple detector circuit that operates independently during specific states (power-on/reset). This separate detection circuit uses minimal components compared to continuous monitoring solutions, reducing overall circuit complexity while maintaining necessary detection accuracy for the critical power-on state.
2Measurement precision
If an additional correction circuit is used to correct a reference voltage, then voltage detection accuracy is improved, but circuit cost increases significantly
Solution Approach 1:
The patent uses a simple, low-cost detector circuit designed for single-use or brief operation during power-on or reset states. This disposable-like approach uses minimal components (comparator, voltage generation circuit, and output control) sufficient for the critical detection moment, avoiding the need for expensive, continuously-operating high-precision reference voltage correction circuits.
Solution Approach 2:
The detection and correction (if needed) occurs preliminarily during power-on or reset before normal operation begins. This timing allows simple detection circuits to suffice, as they only need to verify voltage adequacy once at startup rather than continuously correcting reference voltage throughout operation, significantly reducing circuit complexity requirements.
3Reliability
If continuous voltage monitoring is implemented, then system reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by performing voltage detection only at specific intervals - namely during power-on or reset states when voltage changes occur. The detector remains inactive during normal stable operation, consuming minimal or no power, while still ensuring system reliability by checking voltage adequacy at critical moments when issues are most likely to occur.
Solution Approach 2:
The voltage detection is performed preliminarily at power-on or reset before the system begins normal operation. This preliminary check ensures reliability by confirming voltage adequacy before enabling other circuits, preventing operational errors without requiring continuous monitoring that would consume excessive power throughout the system's operation.
Data Source
AI summary
A voltage detection method includes: outputting a corresponding one of voltages to be an input voltage according to a clock signal, a first detection signal, a reset signal and multiple first bits; generating the reset signal according to the clock signal and multiple currents, wherein the voltages and the currents are generated based on a power supply voltage; comparing the input voltage with a reference voltage to generate a second detection signal, and generating the first detection signal according to the second detection signal and an enable signal; and adjusting the first bits by a digital circuit according to the second detection signal during a trimming phase to determine the first bits, and outputting the first bits by the digital circuit and resetting the digital circuit according to the first detection signal during a voltage detection phase.