Auto-Trimming Voltage Detection Circuit for Undervoltage Precision
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Solution Overview
Problem
Existing voltage detection circuits in electronic systems face precision issues due to detection errors caused by wiring resistance, signal loss, and transformation loss, which can lead to instability or damage when undervoltage conditions are not accurately detected.
Innovation Solution
A voltage detection circuit incorporating a tunable gain circuit and a switch circuit, which operates in an auto-trimming mode to calculate a calibration index and compensate for detection errors, ensuring precise voltage level comparison between a signal under test and a reference signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage detection circuit is used to detect undervoltage conditions, then system protection is provided, but detection precision is reduced due to wiring resistance, signal loss, and transformation loss
Solution Approach 1:
The patent applies parameter changes by introducing a tunable gain circuit that dynamically adjusts the gain parameter of the reference signal. The gain can be configured to different values (e.g., 1x, 2x, 4x, 8x) to compensate for varying levels of signal loss and transformation loss in different operating conditions, thereby maintaining detection precision despite wiring resistance and signal attenuation
Solution Approach 2:
The patent implements feedback through an auto-trimming mode where the detection circuit automatically adjusts the gain configuration based on detected signal characteristics. The system monitors the voltage signal and automatically selects the appropriate gain setting to compensate for measured losses, creating a closed-loop feedback mechanism that maintains optimal detection precision without manual intervention
2Measurement precision
If a tunable gain circuit with multiple gain configurations is added to compensate for signal loss, then detection precision is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by making the gain configuration adjustable rather than fixed. The tunable gain circuit can dynamically switch between multiple gain settings (1x, 2x, 4x, 8x) based on operating conditions, allowing the circuit to adapt to different signal loss scenarios while maintaining a relatively compact structure through shared circuitry that can be reconfigured
3Measurement precision
If an auto-trimming mode is implemented to automatically calibrate the detection circuit, then detection precision is improved, but use of energy increases
Solution Approach 1:
The patent applies periodic action by implementing auto-trimming mode that can be activated at specific intervals or under specific conditions rather than continuously. The calibration process occurs periodically or event-driven (e.g., when undervoltage conditions are detected or at system startup), reducing energy consumption compared to continuous calibration while still maintaining detection precision when needed
Data Source
AI summary
A voltage detection circuit including a comparator circuit, a tunable gain circuit and a switch circuit is disclosed. The comparator circuit has a first input terminal and a second input terminal. The tunable gain circuit is coupled between the first input terminal and a reference signal. The tunable gain circuit has a plurality of gain configurations. The tunable gain circuit adjusts the reference signal and transmits the adjusted reference signal to the first input terminal. The switch circuit selectively transmits a signal under test or the reference signal to the second input terminal. When the voltage detection circuit is in an auto-trimming mode, the switch circuit transmits the reference signal to the second input terminal and the tunable gain circuit sequentially adopts the gain configurations until the comparator circuit detects that voltage levels of the first input terminal and the second input terminal are substantially equal.