Gyro Sensor Intermittent Driving Circuit for Noise Reduction
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Solution Overview
Problem
Gyro sensors face issues with noise and power consumption due to resonance with peripheral components when driven by rectangular wave signals, leading to unnecessary signals in detection and continuous driving even after steady-state oscillation, which increases power consumption.
Innovation Solution
Implementing an intermittent driving method where the vibrator is driven only during specific periods and not driven during others, allowing the detection circuit to process signals in the non-driving periods, reducing noise and power consumption. This includes a driving circuit that outputs a fixed voltage or sets the output node to a high impedance state during non-driving periods and a detection circuit that performs synchronous detection and A/D conversion only during driving periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the vibrator is driven using a rectangular wave driving signal, then the driving signal having an aimed resonance frequency can be obtained, but peripheral members resonate with harmonic components causing unnecessary signals to appear in detection
Solution Approach 1:
The patent applies periodic action by implementing intermittent driving where the vibrator is driven only during specific driving periods and left undriven during non-driving periods. This periodic on-off driving pattern allows the system to achieve the desired resonance frequency control while eliminating continuous harmonic interference that causes unnecessary detection signals. The detection circuit operates during non-driving periods when peripheral member resonance has subsided.
Solution Approach 2:
The patent segments the driving operation into distinct driving periods and non-driving periods. During driving periods, the vibrator receives driving signals to maintain oscillation. During non-driving periods, the driving signal is stopped allowing peripheral members to settle and reducing harmonic interference. This temporal segmentation resolves the contradiction between maintaining driving frequency control and eliminating harmonic interference.
2Reliability
If the vibrator is continuously driven to maintain oscillation, then stable detection can be achieved, but power consumption increases
Solution Approach 1:
The patent implements periodic action through intermittent driving, where the vibrator is driven alternately during driving periods and left undriven during non-driving periods. This periodic operation reduces power consumption compared to continuous driving, while the detection circuit performs detection during non-driving periods when the vibrator maintains residual oscillation, thus maintaining detection stability without continuous energy input.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that the vibrator continues to oscillate during non-driving periods due to its inherent mechanical properties, allowing detection to proceed without interruption. The seamless transition between driving and non-driving periods ensures continuous detection capability while reducing overall power consumption through intermittent actuation.
3Measurement precision
If the detection circuit operates continuously to process detection signals, then detection accuracy is maintained, but noise increases during driving periods
Solution Approach 1:
The patent applies periodic action by configuring the detection circuit to operate selectively during non-driving periods when noise levels are lower. The detection circuit is activated during these periods to process detection signals with reduced noise interference, while remaining inactive during driving periods when noise is higher. This periodic operation timing improves measurement precision by avoiding high-noise intervals.
Solution Approach 2:
The patent extracts the detection operation from continuous operation and confines it to specific non-driving periods when noise conditions are favorable. By taking out detection activities from high-noise driving periods and concentrating them in low-noise non-driving periods, the system achieves better detection accuracy while minimizing the impact of noise generated during driving operations.
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
This approach reduces noise and power consumption by allowing the detection circuit to operate in a low noise state during non-driving periods and minimizing unnecessary signal interference, while maintaining oscillation of the vibrator even in the non-driving state, thus achieving low noise and low power consumption.
Implementation Method 1
a vibration gyro sensor such as a quartz crystal piezoelectric vibration gyro sensor
Implementation Method 2
a physical quantity corresponding to a Coriolis force caused by rotation is detected
Implementation Method 3
a driving signal having an aimed resonance frequency can be obtained
Data Source
AI summary
A detection device includes a driving circuit that drives a vibrator, and a detection circuit that receives a detection signal from the vibrator and performs a detection process of detecting a physical quantity signal corresponding to a physical quantity from the detection signal. The driving circuit performs intermittent driving in which the vibrator is driven in a driving period, and is not driven in a non-driving period, and the detection circuit performs the detection process of the physical quantity signal in the non-driving period of the intermittent driving.