Piezoelectric Sensor Voltage Stabilization Circuit
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Solution Overview
Problem
Piezoelectric sensors currently fail to maintain a stable output voltage even when a constant force is applied, making it difficult to accurately measure the correlation between force and output voltage.
Innovation Solution
A piezoelectric sensing system comprising a piezoelectric sensor, a voltage stabilizer that stores energy and maintains a constant voltage when the pressure rate is zero, and a discharger that releases residual charges to ground, along with an operation sensor that generates a trigger signal to control the discharger, ensuring accurate voltage output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a piezoelectric sensor is used to detect force, then the sensing capability is provided, but the output voltage cannot be kept stable even when constant force is applied
Solution Approach 1:
The patent introduces a voltage stabilizer circuit as an intermediary component between the piezoelectric sensor and the measurement system. This stabilizer includes a capacitor that stores electrical charge and a voltage regulation mechanism that maintains constant output voltage regardless of fluctuations in the piezoelectric sensor's output, thereby resolving the contradiction between sensing capability and voltage stability.
Solution Approach 2:
The patent changes the electrical parameters of the sensing system by introducing active voltage regulation. The voltage stabilizer dynamically adjusts its output parameters (voltage level, impedance) to compensate for the piezoelectric sensor's inherent instability, transforming the system from passive voltage output to actively regulated voltage output, thus achieving stable measurement readings.
2Measurement precision
If piezoelectric sensors are used in force sensors, then force detection is enabled, but accumulated errors occur and measurement accuracy deteriorates
Solution Approach 1:
The patent implements a reset mechanism that periodically discards accumulated electrical charge in the piezoelectric sensor and associated capacitors. The reset circuit includes a discharge path that safely releases accumulated charge when resetting is required, preventing error accumulation while preserving the sensing capability during normal operation.
Solution Approach 2:
The patent introduces feedback control through the voltage stabilizer circuit that continuously monitors the output voltage and adjusts its regulation to maintain stability. This feedback mechanism detects deviations from the target voltage level and corrects them in real-time, preventing error accumulation and maintaining measurement accuracy over extended periods.
3Speed
If the piezoelectric sensor outputs signal according to rate of change of pressure, then dynamic pressure sensing is achieved, but stable voltage output during constant pressure cannot be maintained
Solution Approach 1:
The patent creates a dynamic system that adapts its behavior based on operating conditions. The voltage stabilizer automatically adjusts its regulation strategy: during pressure changes, it tracks the varying output; during constant pressure, it locks to maintain stable voltage. This dynamic adaptation resolves the contradiction between responsive sensing and stable output.
Solution Approach 2:
The patent applies preliminary action through the voltage stabilizer that proactively compensates for expected voltage fluctuations before they affect the measurement output. The stabilizer anticipates variations in piezoelectric output and pre-adjusts its regulation parameters to maintain constant voltage, rather than merely reacting to changes after they occur.
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
The system maintains a stable voltage output when pressure is constant and quickly returns to zero after pressure release, improving measurement accuracy and eliminating accumulated errors.
Implementation Method 1
a piezoelectric sensor (1) comprising a sensor output terminal (1a), wherein the piezoelectric sensor (1) outputs a sensing signal through the sensor output terminal (1a) according to a rate of change of pressure sensed by the piezoelectric sensor (1)
Implementation Method 2
a voltage stabilizer (3) comprising a positive terminal (3a) electrically connecting with the sensor output terminal (1a), wherein the voltage stabilizer (3) receives the sensing signal outputted by the piezoelectric sensor (1), stores an energy of the sensing signal, and keeps a voltage of the sensing signal as a constant when the rate of change of pressure is zero
Data Source
AI summary
A piezoelectric system comprises a piezoelectric sensor, a voltage stabilizer, a discharger and an operation sensor. The piezoelectric sensor outputs a sensing signal through a sensor output terminal according to a rate of change of pressure. The voltage stabilizer has a positive terminal electrically connecting with the sensor output terminal. The voltage stabilizer receives the sensing signal, stores the energy of the sensing signal, and keeps the voltage of the sensing signal as a constant when the rate of change of pressure is zero. The discharger has a first terminal connecting with the positive terminal, a second terminal coupled to ground, and a control terminal receiving a trigger signal to control the first terminal to conduct with or not conduct with the second terminal. The operation sensor electrically connects to the control terminal for sensing an operation generating the pressure and outputs the trigger signal accordingly.