Piezoelectric Drive Circuit With Feedback Level Switching
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Solution Overview
Problem
Existing drive circuits for piezoelectric elements in liquid ejecting apparatuses, such as inkjet printers, face challenges in waveform accuracy and switching loss, which are not adequately addressed by prior technologies like JP-A-2022-057167.
Innovation Solution
A drive circuit design incorporating a modulation circuit, amplification circuit, level switching signal generation, level shift circuit, demodulation circuit, and feedback circuit to enhance the drive signal generation process, including a level switching signal that switches potentials in response to reference and feedback signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a level shift circuit is used to amplify the modulation signal, then the drive signal can be generated with sufficient current, but switching loss increases and waveform accuracy deteriorates
Solution Approach 1:
The patent introduces a feedback circuit that detects the drive signal and feeds it back to the modulation circuit. This feedback mechanism enables the modulation circuit to adjust its output based on the actual drive signal conditions, optimizing the switching timing and reducing switching losses while maintaining waveform accuracy. The feedback loop creates a closed-control system that dynamically adapts to load conditions.
Solution Approach 2:
The patent employs dynamic level switching signal generation that adapts based on feedback from the drive signal. The level switching signal is not fixed but dynamically adjusted in response to actual operating conditions, allowing the system to optimize switching behavior in real-time. This dynamic adjustment reduces switching losses by timing the level transitions optimally while preserving waveform integrity.
2Power
If a level shift circuit is used to amplify the modulation signal, then the drive signal can be generated with sufficient current, but waveform accuracy deteriorates
Solution Approach 1:
The feedback circuit continuously monitors the drive signal waveform and provides correction information to the modulation circuit. This closed-loop control ensures that waveform accuracy is maintained despite the amplification process. The modulation circuit adjusts its output based on feedback, compensating for any distortion introduced during signal amplification and level shifting.
Solution Approach 2:
The system dynamically adjusts the level switching timing and amplitude based on feedback from the actual drive signal. This dynamic adaptation allows the system to maintain high waveform accuracy even when delivering sufficient current to the piezoelectric element. The modulation depth and switching timing are continuously optimized based on real-time conditions.
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
Improves waveform accuracy and reduces switching losses, resulting in more efficient operation of piezoelectric elements and enhanced performance of liquid ejection in devices like inkjet printers.
Implementation Method 1
a device using piezoelectric elements is known. In such a liquid ejecting apparatus, the piezoelectric elements are provided to correspond to a plurality of nozzles that eject the liquid
Data Source
AI summary
A drive circuit includes a modulation circuit that outputs a modulation signal, an amplification circuit that outputs a first amplified modulation signal obtained by amplifying the modulation signal, a reference signal generation circuit that generates a reference signal corresponding to the base drive signal, a level switching signal generation circuit that receives, as an input, the reference signal, and generates a level switching signal, a level shift circuit that outputs the first amplified modulation signal, or outputs a signal obtained by shifting a potential of the first amplified modulation signal, a demodulation circuit that demodulates the second amplified modulation signal, and outputs the drive signal, and a feedback circuit that outputs a first feedback signal in response to the drive signal. The level switching signal generation circuit switches a potential of the level switching signal in response to the reference signal and the first feedback signal.