Nonlinear Oscillator Control With Dual-Loop Phase and Amplitude Feedback
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Solution Overview
Problem
LIDAR systems with non-linear oscillating mirrors face challenges in maintaining precise control over angle amplitude and frequency due to external disturbances, leading to oscillation amplitude and frequency changes, which are not effectively compensated by traditional phase-locked loop systems.
Innovation Solution
A control structure comprising an outer amplitude controller and an inner period and phase controller, which measures angle amplitude and phase error to generate a driving signal that adapts the oscillator period and frequency, ensuring stable oscillation by compensating for phase and amplitude errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional phase-locked loop (PLL) is used to control the oscillator, then the oscillator phase can be tracked, but the amplitude control is slow and cannot compensate for fast changes in amplitude due to the noisy amplitude measurements
Solution Approach 1:
The control system is segmented into two independent control loops: an inner loop for phase control and an outer loop for amplitude control. The inner loop uses precise phase measurements to quickly adjust the driving frequency, while the outer loop uses amplitude measurements to adjust the driving amplitude. This segmentation allows each loop to operate at its optimal speed without being constrained by the other loop's measurement noise or response time.
Solution Approach 2:
The patent implements feedback mechanisms in both control loops. The inner loop continuously monitors phase error and adjusts the driving frequency in real-time to maintain synchronization. The outer loop monitors amplitude and adjusts the driving amplitude to maintain the desired oscillation level. This dual feedback system ensures that both phase and amplitude are independently controlled with appropriate response speeds for each parameter.
2Reliability
If the PLL adapts the driving period based on phase and amplitude measurements, then the oscillator can be controlled, but the amplitude control is slow compared to phase control due to noisy amplitude measurements
Solution Approach 1:
The control system is divided into two independent control loops: an inner loop for phase control and an outer loop for amplitude control. The inner loop uses precise phase measurements to quickly adjust the driving frequency, while the outer loop uses amplitude measurements to adjust the driving amplitude. This segmentation allows each loop to operate at its optimal speed without being constrained by the other loop's measurement noise or response time.
Solution Approach 2:
The patent implements feedback mechanisms in both control loops. The inner loop continuously monitors phase error and adjusts the driving frequency in real-time to maintain synchronization. The outer loop monitors amplitude and adjusts the driving amplitude to maintain the desired oscillation level. This dual feedback system ensures that both phase and amplitude are independently controlled with appropriate response speeds for each parameter.
3Device complexity
If a single control loop is used to control both phase and amplitude, then the system structure is simple, but the control bandwidth is limited and cannot effectively compensate for disturbances
Solution Approach 1:
The control system is divided into two independent control loops: an inner loop for phase control and an outer loop for amplitude control. The inner loop uses precise phase measurements to quickly adjust the driving frequency, while the outer loop uses amplitude measurements to adjust the driving amplitude. This segmentation allows each loop to operate at its optimal speed without being constrained by the other loop's measurement noise or response time.
Solution Approach 2:
The patent implements feedback mechanisms in both control loops. The inner loop continuously monitors phase error and adjusts the driving frequency in real-time to maintain synchronization. The outer loop monitors amplitude and adjusts the driving amplitude to maintain the desired oscillation level. This dual feedback system ensures that both phase and amplitude are independently controlled with appropriate response speeds for each parameter.
Data Source
AI summary
An oscillator control system includes an non-linear oscillator structure configured to oscillate about an axis; a driver circuit configured to generate a driving signal to drive the oscillator structure; a detection circuit configured to measure an angle amplitude and a phase error of the oscillator structure; an amplitude controller configured to generate a reference oscillator period based on the measured angle amplitude; a period and phase controller configured to receive the reference oscillator period and the measured phase error from the detection circuit, generate at least one control parameter of the driving signal based on the reference oscillator period and the measured phase error, and determine a driving period of the driving signal based on the reference oscillator period and the measured phase error. The driver circuit is configured to generate the driving signal based on the at least one control parameter and the driving period.