Piezoelectric Drive Circuit Control for High-Frequency Liquid Ejection
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Solution Overview
Problem
Existing liquid ejecting apparatuses using piezoelectric elements face challenges in achieving high-frequency drive signals due to insufficient amplification in their drive circuits.
Innovation Solution
A method involving the modulation and demodulation of drive signals using inductive circuits with varying inductance values to control the voltage potential, enhancing the amplification process and enabling high-frequency signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional amplifier circuit is used to drive piezoelectric elements, then the circuit structure is simple, but the drive signal frequency cannot be achieved at high frequencies
Solution Approach 1:
The amplifier circuit is divided into multiple functional modules: modulation section, amplification section, and demodulation section. Each section performs a specific function, allowing the system to achieve high-frequency drive signals while maintaining manageable circuit complexity through functional decomposition.
Solution Approach 2:
A modulated signal is introduced as an intermediary between the base drive signal and the amplified output. The modulation process converts the base signal to a higher frequency carrier, which is then amplified and demodulated to produce the final high-frequency drive signal, enabling frequency multiplication without directly amplifying high-frequency signals.
2Measurement precision
If the inductance value of the inductive circuit is increased to improve demodulation accuracy, then the voltage control precision is improved, but the response speed decreases
Solution Approach 1:
The inductance value of the inductive circuit is made dynamically adjustable rather than fixed. The control section changes the inductance value based on the operating conditions: using a first inductance value when voltage is constant for precision, and a second inductance value when voltage changes for speed, thereby adapting the circuit characteristics to different operational requirements.
Solution Approach 2:
The inductance parameter of the inductive circuit is changed according to different operational states. By switching between different inductance values, the system optimizes the balance between precision and response speed, using higher inductance for accurate voltage control during steady states and lower inductance for faster response during transitions.
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 allows for improved control of liquid ejection frequency, ensuring precise and efficient operation of piezoelectric elements in liquid ejecting apparatuses.
Implementation Method 1
the modulated signal is demodulated using an inductive circuit having a first inductance value
Data Source
AI summary
A method of controlling a liquid ejecting apparatus includes: outputting a drive signal obtained by amplifying a base drive signal; and ejecting liquid in accordance with the drive signal. The drive signal is generated by modulating, amplifying, and demodulating the base drive signal. In the outputting the drive signal obtained by demodulating the amplified modulated signal, the amplified modulated signal is demodulated using an inductive circuit having a first inductance value in a first period of time when a voltage value of the drive signal is controlled to be constant at a first electrical potential, and the amplified modulated signal is demodulated by using the inductive circuit having a second inductance value lower than the first inductance value in a second period of time when the voltage value of the drive signal changes from the first electrical potential toward a second electrical potential.