Micromechanical Sensor Voltage Dynamics for Start-Up and Operation
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Solution Overview
Problem
Conventional micromechanical sensor systems with rotation rate sensors face challenges in achieving efficient, energy-efficient operation while maintaining a fast start-up time due to high power consumption and undesirable feedback effects associated with high offset and drive voltages.
Innovation Solution
The system dynamically adjusts offset and maximum voltages between start-up and operating modes, using higher values during start-up and lower values during operation, with the aid of a charge pump and quality factor adjustments, to reduce energy consumption and maintain oscillation amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high offset voltage is applied to the seismic mass, then the sensitivity and available driving force are improved, but the power consumption and feedback effects deteriorate
Solution Approach 1:
The offset voltage is made dynamically adjustable between a first level during start-up phase and a second level during operating mode. The control unit switches between these voltage levels based on the operational phase, allowing the system to optimize both sensitivity and power consumption at different times.
Solution Approach 2:
The patent changes the voltage parameter dynamically by implementing multiple offset voltage levels (first level for start-up, second level for operation). This parameter change allows the system to achieve high driving force during start-up and reduced power consumption during normal operation.
2Force
If the maximum voltage available from the driver is increased, then the available driving force is improved, but the power consumption deteriorates
Solution Approach 1:
The maximum voltage from the driver is dynamically adjusted based on operational phase. During start-up, a higher voltage is provided to maximize driving force, while during operating mode, the voltage is reduced to minimize power consumption while maintaining sufficient drive capability.
Solution Approach 2:
The operational timeline is segmented into start-up phase and operating mode, with different voltage levels applied to each segment. This segmentation allows optimization of voltage levels for specific operational requirements.
3Loss of time
If a high offset voltage is used to ensure quick start-up, then the start-up time is reduced, but the energy consumption during operation increases
Solution Approach 1:
The offset voltage is dynamically switched between high level during start-up phase and low level during operating mode. This dynamic adjustment allows the system to achieve quick start-up with high voltage while minimizing energy consumption during the extended operating phase.
Solution Approach 2:
The system implements periodic voltage adjustment based on operational phase transitions. During start-up, high voltage is applied periodically to accelerate the process, then switched to low voltage for sustained operation, creating an optimized temporal pattern of energy usage.
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 allows for a short start-up time with high energy efficiency in the operating mode, balancing energy usage and performance by leveraging different voltage levels and quality factor adjustments.
Implementation Method 1
the offset voltage is generated with the aid of a charge pump
Implementation Method 2
The maximum available driving force for exciting the seismic mass results from the product of the offset voltage and the maximum voltage available from the driver of the drive voltage
Implementation Method 3
adjusting the quality factor of the mechanical structure/sensor system
Data Source
AI summary
A micromechanical sensor system including a rotation rate sensor and a method for operating the system. The rotation rate sensor includes a seismic mass, and a drive device. For driving, the seismic mass is subjected to an offset voltage and a drive voltage. The seismic mass is excited to oscillate using the drive voltage. The rotation rate sensor can selectively be operated in a start-up mode and in an operating mode. The offset voltage during operation of the rotation rate sensor in the start-up mode is different from the offset voltage during operation of the rotation rate sensor in the operating mode, and/or the maximum voltage available from the driver of the drive voltage during operation of the rotation rate sensor in the start-up mode is different from the maximum voltage available during operation of the rotation rate sensor in the operating mode.