Microelectromechanical Gyroscope Open-Loop Reading Device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional microelectromechanical gyroscopes require complex and power-consuming demodulation and synchronization devices to detect Coriolis forces, leading to increased encumbrance and power consumption, especially in modern electronic devices.
Innovation Solution
A microelectromechanical gyroscope with an open-loop reading device that uses a square-wave signal of amplitude varying sinusoidally at the resonance frequency to detect displacements, eliminating the need for demodulators and PLL circuits by performing demodulation directly during signal excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional reading devices with demodulators and PLL circuits are used to detect Coriolis forces, then accurate detection of angular velocity is achieved, but device complexity and power consumption increase significantly
Solution Approach 1:
The patent extracts and eliminates the complex demodulation and synchronization circuitry (PLL, demodulators) from the reading device. By using an open-loop reading approach with square-wave signals, the invention removes these unnecessary components while maintaining detection capability, directly reducing device complexity without sacrificing measurement precision.
Solution Approach 2:
The patent replaces the conventional closed-loop demodulation system with an open-loop system that uses simple square-wave signals. This substitution eliminates the need for complex synchronization mechanisms and demodulators, achieving the same detection function through a simpler mechanical/electrical approach.
2Measurement precision
If conventional reading devices with demodulators and PLL circuits are used to detect Coriolis forces, then accurate detection of angular velocity is achieved, but power consumption increases
Solution Approach 1:
The patent extracts and eliminates the power-intensive demodulation and synchronization circuitry (PLL, demodulators) from the reading device. By using an open-loop reading approach with square-wave signals, the invention removes these unnecessary components, directly reducing power consumption without sacrificing detection accuracy.
Solution Approach 2:
The patent replaces the conventional closed-loop demodulation system with an open-loop system that uses simple square-wave signals. This substitution eliminates the need for complex synchronization mechanisms and demodulators, achieving the same detection function through a simpler approach that consumes less power.
3Measurement precision
If conventional reading devices with demodulators and PLL circuits are used to detect Coriolis forces, then accurate detection of angular velocity is achieved, but the encumbrance of the device increases
Solution Approach 1:
The patent extracts and eliminates the bulky demodulation and synchronization circuitry (PLL, demodulators) from the reading device. By using an open-loop reading approach with square-wave signals, the invention removes these unnecessary components, directly reducing the device volume and encumbrance while maintaining detection capability.
Solution Approach 2:
The patent replaces the conventional closed-loop demodulation system with an open-loop system that uses simple square-wave signals. This substitution eliminates the need for complex synchronization mechanisms and demodulators, achieving the same detection function through a simpler approach that occupies less space.
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 simplifies the reading device, reduces power consumption, and decreases encumbrance by eliminating the need for complex demodulation and synchronization circuits, while maintaining accurate detection of angular velocity.
Implementation Method 1
The movable mass and the stator are capacitively coupled through a plurality of respective comb-fingered and mutually facing electrodes so as to form capacitors. By supplying appropriate biasing voltages, it is possible to apply an electrostatic force on the movable mass to set it in motion.
Implementation Method 2
a driving device coupled to the first mass so as to form a feedback control loop and configured to maintain the first mass in oscillation at a resonance frequency
Implementation Method 3
The other mass is drawn along in oscillating motion and, in the case of rotation of the microstructure with respect to a pre-determined gyroscopic axis with an angular velocity, is subjected to a Coriolis force proportional to the angular velocity itself.
Implementation Method 4
The movement of the movable mass with respect to the stator, for example on account of application of an external force, modifies the capacitance of the capacitors, whence it is possible to trace back to the relative displacement of the movable mass with respect to the fixed body and hence to the applied force.
Data Source
AI summary
A microelectromechanical gyroscope that includes a first mass oscillatable according to a first axis; an inertial sensor, including a second mass, drawn along by the first mass and constrained so as to oscillate according to a second axis, in response to a rotation of the gyroscope; a driving device coupled to the first mass so as to form a feedback control loop and configured to maintain the first mass in oscillation at a resonance frequency; and an open-loop reading device coupled to the inertial sensor for detecting displacements of the second mass according to the second axis. The driving device includes a read signal generator for supplying to the inertial sensor at least one read signal having the form of a square-wave signal of amplitude that sinusoidally varies with the resonance frequency.