Oscillation Phase-Shift Feedback for Lower Drive Power
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Solution Overview
Problem
Conventional oscillation devices face inefficiencies due to deviations in phase shift from integer multiples of 0° or 360°, leading to increased drive power and reduced drive efficiency, and potential loss of self-oscillation when phase shift deviations become significant.
Innovation Solution
An oscillation device with a phase shift unit that includes a disturbance generating unit, fluctuation unit, drive amplitude detection unit, product detection unit, and adjustment unit, which outputs a periodic signal to adjust the phase shift based on detected amplitude changes, ensuring the phase shift remains close to optimal values, thereby minimizing drive signal amplitude and maintaining high drive efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the phase shift amount in a single complete loop deviates from 0° due to variations in oscillators or environmental changes, then self-oscillation can still be maintained with some deviation (±15°), but the amplitude of the drive signal must be increased to keep the oscillator amplitude constant, resulting in increased drive power and reduced drive efficiency
Solution Approach 1:
The patent employs a feedback mechanism where the phase shift amount is continuously monitored and adjusted based on the detected oscillation state. The system detects the oscillation output, measures the actual phase shift deviation from the ideal 0° (or 360°n) value, and automatically adjusts the phase shift unit to compensate for deviations caused by oscillator variations or environmental changes, thereby maintaining optimal drive efficiency while ensuring reliable self-oscillation
Solution Approach 2:
The system dynamically changes the phase shift parameter to optimize performance. By adjusting the phase shift amount in response to detected deviations, the system adapts to variations in oscillator characteristics and environmental conditions, maintaining the phase shift close to integer multiples of 360° to minimize drive power while preserving self-oscillation stability
2Reliability
If the phase shift amount in a single complete loop deviates significantly from 0°, then self-oscillation may be lost entirely, but adjusting the phase shift requires additional control mechanisms
Solution Approach 1:
The system implements self-service by automatically detecting and correcting its own phase shift deviations. The oscillation detection unit monitors the oscillation state, and the control mechanism automatically adjusts the phase shift without requiring external intervention or complex manual calibration, enabling the system to self-correct and maintain reliable self-oscillation
Solution Approach 2:
A feedback loop continuously monitors the oscillation output and automatically adjusts the phase shift amount to keep it close to integer multiples of 360°. This feedback mechanism ensures that even when oscillator variations or environmental changes cause deviations, the system self-corrects to maintain stable self-oscillation without requiring complex external control
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 configuration significantly reduces deviations in phase shift, allowing for reduced drive signal amplitude and increased drive efficiency, ensuring consistent self-oscillation and efficient operation despite variations in oscillators and environmental changes.
Implementation Method 1
conventional oscillation devices cause an oscillator to self-oscillate by supplying the oscillator with a drive signal at a frequency that is made to match the mechanical resonance frequency of the oscillator
Implementation Method 2
the drive unit includes a phase shift unit which shifts the phase for the purpose of providing the drive signal as positive feedback to the oscillator
Implementation Method 3
an oscillation detection unit which detects oscillation of the oscillator and outputs an oscillation detection signal
Data Source
AI summary
An oscillation device includes an oscillator, an oscillation detection unit that detects oscillation of the oscillator and outputs an oscillation detection signal, and a drive unit that generates a drive signal in keeping with the oscillation detection signal and outputs the drive signal to the oscillator. The drive unit includes a phase shift unit that shifts the phase to provide the drive signal as positive feedback to the oscillator. The phase shift unit includes a disturbance generating unit that outputs the periodic signal, a fluctuation unit that causes the amount of phase shift to fluctuate based on the periodic signal, a drive amplitude detection unit that detects the amplitude of the drive signal and outputs a drive amplitude signal, a product detection unit that outputs a detection signal after performing product detection on the drive amplitude signal based on the periodic signal, and an adjustment unit that adjusts the phase-shift amount based on the detection signal.