Hall Sensor Switching Control for Low-Current Intermittent Detection
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Solution Overview
Problem
Existing sensor devices face challenges in achieving improved reproducibility of switching characteristics and reduced average consumption current, particularly when combining multi-time determination techniques with intermittent driving methods, which often result in longer operation periods and increased power consumption.
Innovation Solution
A sensor device incorporating a Hall element, drive circuit, processing circuit, determination circuit, latch circuit, and control circuit that intermittently controls operation and pause periods based on determination processing outcomes, allowing for reduced average consumption current while maintaining reproducibility of switching characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-time determination technique is combined with intermittent driving technique, then detection accuracy is improved, but operation period becomes longer and average consumption current increases
Solution Approach 1:
The determination circuit performs determination processing in advance during the operation period and predicts whether the output logic will switch. Based on this preliminary assessment, the control circuit decides whether to continue or interrupt the operation period, avoiding unnecessary extension of the operation period and reducing average consumption current while maintaining detection accuracy
Solution Approach 2:
The system uses feedback from the determination circuit's output logic status to control the operation period. When the output logic is determined to be not switched halfway through the operation period, the system feeds back this information to the control circuit, which then interrupts the operation period and transitions to pause period, optimizing the balance between detection accuracy and power consumption
2Reliability
If operation period is extended to perform multi-time determination processing, then reproducibility of switching characteristics is improved, but duty ratio increases and power saving effect is reduced
Solution Approach 1:
The determination circuit performs determination processing in advance during the operation period and predicts whether the output logic will switch. Based on this preliminary assessment, the control circuit decides whether to continue or interrupt the operation period, avoiding unnecessary extension of the operation period and reducing average consumption current while maintaining detection accuracy
Solution Approach 2:
The operation period duration is made dynamic rather than fixed. The control circuit adjusts the operation period length based on real-time feedback from the determination circuit. When determination processing shows that output logic is not switched halfway through, the operation period is dynamically interrupted and transitioned to pause period, optimizing the balance between reproducibility and power consumption
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
The solution effectively improves reproducibility of switching characteristics and reduces average consumption current by strategically interrupting operation periods based on determination results, enhancing energy efficiency in battery-powered devices.
Implementation Method 1
A Hall element is used for various applications because the Hall element can detect a position and an angle in a non-contact manner as a magnetic sensor
Data Source
AI summary
Provided is a sensor device provided with improved reproducibility of a switching characteristic and reduced average consumption current. A sensor device include: a sensor; a drive circuit configured to drive the sensor; a processing circuit configured to output a binary result signal obtained by binarizing an electrical signal output from the sensor; a determination circuit configured to capture the binary result signal a plurality of times and perform a predetermined logical determination processing; a latch circuit configured to capture an output signal of the determination circuit; an output terminal; and a control circuit configured to output a control signal for intermittently controlling at least one of the drive circuit and the processing circuit such that an operation period and a pause period are repeated with a predetermined cycle. The operation period is interrupted and caused to transition to the pause period in a predetermined case.