Quartz Pendulous Accelerometer Digital Pulse Feedback
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Solution Overview
Problem
Traditional quartz pendulous accelerometers face challenges with circuit scale and cost, system response, dynamic error, digital quantization precision, and linearity due to complex I-F conversion circuits and analog feedback loops, which affect precision and noise levels.
Innovation Solution
The implementation of a multi-order sigma-delta modulation control method with a high-order sigma-delta modulator (SDM) for digital feedback, oversampling, and quantized noise shaping to improve linearity and dynamic precision, and reduce quantized noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If traditional I-F conversion circuit or A/D conversion circuit is used for digital quantization, then digitization of accelerometer output is achieved, but circuit scale increases and cost increases
Solution Approach 1:
The patent extracts the digital quantization function from traditional complex I-F conversion or A/D conversion circuits and implements it through a simplified pulse generating apparatus that directly generates quantized current pulses based on meter output signals, eliminating the need for complex conversion circuits while achieving the same digitization effect
Solution Approach 2:
The patent replaces the traditional electronic conversion circuit system with a pulse-based control system that uses a pulse generating apparatus to directly convert meter output signals into quantized current pulses, substituting complex electronic conversion with a more straightforward pulse generation mechanism
2Reliability
If traditional analog feedback loop is used, then closed-loop control is achieved, but dynamic precision decreases and system response is limited
Solution Approach 1:
The patent transitions from static analog feedback to dynamic digital pulse feedback, where the pulse generating apparatus dynamically adjusts current pulse parameters (amplitude, width, frequency) based on real-time meter output signals, enabling the closed-loop system to adapt to dynamic conditions and improve dynamic precision
Solution Approach 2:
The patent changes the feedback parameter from continuous analog voltage/current to discrete quantized current pulses with variable parameters (amplitude, width, frequency), allowing the system to maintain closed-loop control while achieving higher dynamic precision through digital quantization
3Stability of the object's composition
If traditional analog feedback is used, then force balance is achieved, but linearity and dynamic precision are compromised
Solution Approach 1:
The patent implements a digital pulse feedback mechanism where the pulse generating apparatus continuously monitors meter output signals and adjusts quantized current pulses in real-time to maintain force balance, improving linearity through digital quantization while preserving the fundamental force balance principle
Solution Approach 2:
The patent uses periodic current pulses instead of continuous analog feedback, where the pulse generating apparatus delivers series of quantized current pulses at specific frequencies to maintain force balance, achieving both linearity improvement through quantization and stable force balance through periodic control action
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 enhances the closed-loop system's linearity and dynamic precision, achieves low quantized noise, and provides digital quantity outputs, overcoming the limitations of traditional analog feedback systems.
Implementation Method 1
After receiving an external acceleration signal, the quartz pendulum swings due to an inertial force so that capacitance values of the differential capacitors change
Implementation Method 2
the quartz pendulum and end faces of the torquer yoke make up a differential capacitors with the upper gold-plated face and the lower gold-plated face of the quartz pendulum acting as movable polar plates
Implementation Method 3
A signal conditioning circuit then outputs a driving current to a torquer through the torquer coil to create a balancing force (balancing torque), which counter-balances the inertial force (inertial torque) generated by the external inertia acceleration
Implementation Method 4
perform control algorithm conversion, oversampling and digital quantization on the input signal to obtain a quantized current pulse
Implementation Method 5
perform control algorithm conversion, oversampling and digital quantization on the input signal to obtain a quantized current pulse
Data Source
AI summary
Provided is a quartz pendulous accelerometer including a quartz meter configured to sense an acceleration signal, convert the acceleration signal into an inertia torque, and convert the inertia torque into a quartz meter output signal; a readout apparatus configured to convert the meter output signal into an input signal recognizable by a pulse generating apparatus; and a pulse generating apparatus configured to perform control algorithm conversion, oversampling and digital quantization on the input signal to obtain a quantized current pulse, which is converted into an electromagnetic pulse torque for balancing the inertia torque.