Auto Phase Control Drive Circuit for Gyroscope
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Solution Overview
Problem
Conventional drive circuits for gyroscope apparatuses face phase differences between drive and pick-off signals due to environmental variations, affecting detection accuracy in applications like smartphones and navigation systems.
Innovation Solution
An auto phase control drive circuit with a first circuit and a second circuit, where the second circuit adjusts the capacitance of a variable capacitor based on signals to minimize phase differences between the drive and pick-off signals, using amplifiers and phase changers to maintain signal phase alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional electronic parts (amplifiers, capacitors, resistors) are used in the drive circuit, then the circuit can provide basic amplification and phase adjustment, but the phase difference between drive and pick-off signals shifts due to environmental variations
Solution Approach 1:
The patent implements an auto phase control system where the phase difference detection circuit continuously monitors the phase difference between drive and pick-off signals, and the capacitance adjustment circuit automatically adjusts the variable capacitor based on this feedback to maintain zero phase difference, thereby resolving the phase stability issue under environmental variations
Solution Approach 2:
The patent uses a variable capacitor whose capacitance can be dynamically changed by the capacitance adjustment circuit. By changing the capacitance parameter in response to environmental variations, the system compensates for phase shifts and maintains accurate phase alignment between signals
2Device complexity
If fixed capacitance capacitors are used in the circuit, then the circuit structure is simple, but the phase difference cannot be corrected when environmental conditions change
Solution Approach 1:
The patent replaces fixed capacitance capacitors with variable capacitors that can dynamically adjust their capacitance values. The capacitance adjustment circuit changes the capacitance in real-time based on phase difference feedback, enabling the circuit to adapt to environmental changes while maintaining phase alignment
Solution Approach 2:
The auto phase control system is self-regulating, where the phase difference detection and capacitance adjustment circuits automatically compensate for phase shifts without external intervention. The system monitors itself and corrects phase errors autonomously in response to environmental variations
Data Source
AI summary
An auto phase control drive circuit for a gyroscope apparatus is disclosed. The gyroscope apparatus has a gyro resonator, and the circuit comprises a first circuit and a second circuit. The first circuit includes a first electrode configured to face the gyro resonator, a first amplifier configured to be electrically connected with the first electrode and output a first signal, a variable capacitor electrically connected with the first amplifier, a second electrode configured to face the gyro resonator, to receive a second signal and to be electrically connected with the variable capacitor. The second circuit is configured to be electrically connected with the first circuit and to change a capacitance of the variable capacitor of the first circuit based on the first signal and the second signal to decrease a phase difference between the first signal and the second signal.