Piezoelectric Vibration Drive Circuit With Temperature Gain Compensation
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Solution Overview
Problem
Existing vibration generating apparatuses using piezoelectric elements face issues due to capacitance variations caused by temperature changes, leading to undesired changes in the driving signal and subsequent malfunction of the piezoelectric element.
Innovation Solution
A vibration generating apparatus and method that predict internal temperature values of vibration apparatuses and driving circuits based on current driving signal values, and compensate for the driving signals accordingly to maintain consistent performance across varying temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piezoelectric element is used to generate vibration, then vibration can be produced, but capacitance varies with temperature causing driving signal changes and malfunction
Solution Approach 1:
The system performs preliminary temperature prediction based on driving signal current values before the temperature variation affects operation. By predicting the internal temperature in advance and pre-compensating the driving signal, the system prevents capacitance variation-induced malfunction rather than reacting after the problem occurs.
Solution Approach 2:
The system establishes a feedback loop where the driving signal current value is continuously monitored, used to predict internal temperature, and then used to adjust subsequent driving signals. This closed-loop control ensures the piezoelectric element operates reliably despite temperature changes by constantly adapting the driving signal based on predicted temperature conditions.
2Reliability
If temperature compensation is implemented to maintain stable operation, then driving signal stability improves, but system complexity increases due to temperature prediction and compensation circuits
Solution Approach 1:
The system uses the existing driving signal current value as the basis for temperature prediction, eliminating the need for separate temperature sensors or additional measurement circuits. The driving signal itself serves dual purposes: actuating the piezoelectric element and providing information for temperature compensation, thereby reducing overall system complexity.
Solution Approach 2:
The system compensates for temperature effects by dynamically adjusting parameters of the driving signal (amplitude, frequency, or phase) based on predicted temperature values. By changing the driving signal parameters rather than adding physical compensation components, the system maintains reliability while minimizing structural complexity.
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 proposed solution effectively compensates for temperature-induced variations in capacitance, ensuring stable operation of the vibration generating apparatus by adjusting the driving signal based on predicted temperature values, thereby minimizing adverse effects on the vibration apparatus and driving circuit.
Implementation Method 1
Apparatuses for generating a vibration include a piezoelectric element
Data Source
AI summary
A vibration generating apparatus comprises a vibration apparatus and a vibration driving circuit including a driving signal generator configured to supply a driving signal to the vibration apparatus, wherein the driving signal generator is configured to adjust a frequency-based gain compensation value based on at least one of a circuit internal temperature value of the vibration driving circuit and a temperature prediction value of the vibration apparatus corresponding to a current value of an nth driving signal, compensate for a frequency-based gain value based on the adjusted frequency-based gain compensation value, compensate for an (n+1)th driving signal based on the compensated frequency-based gain value, and supply the compensated (n+1)th driving signal to the vibration apparatus.