Image-Forming Head Power Supply for Piezoelectric Resonance Control
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Solution Overview
Problem
Resonance between the switching frequency of a switching power supply and the natural vibration frequency of a piezoelectric element in an inkjet-type image forming apparatus can cause malfunctions.
Innovation Solution
The switching power supply operates with a frequency different from the natural vibration frequency of the actuator unit, and the controller adjusts the switching frequency to avoid resonance, using a step-up DC/DC switching converter and step-down power supplies to supply power to the actuator units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the switching frequency of the switching power supply is set to be substantially identical to the natural vibration frequency of the piezoelectric element, then power supply efficiency is improved, but resonance occurs causing malfunction
Solution Approach 1:
The patent applies parameter changes by adjusting the switching frequency of the power supply to be different from the natural vibration frequency of the piezoelectric element. The controller modifies the switching frequency parameter to avoid resonance conditions, thereby preventing malfunction while maintaining acceptable power supply efficiency through optimized frequency selection.
2Reliability
If the switching frequency is adjusted to avoid resonance with the piezoelectric element, then reliability is improved, but power supply efficiency may deteriorate
Solution Approach 1:
The patent implements dynamics by enabling the controller to dynamically adjust the switching frequency based on operational conditions. The system can adapt the switching frequency to avoid resonance with the piezoelectric element while optimizing power supply efficiency, allowing flexible operation across different printing conditions and load requirements.
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
Prevents malfunctions by ensuring the actuator units do not vibrate with the natural frequency, effectively restraining ripple noise and maintaining stable ink ejection.
Implementation Method 1
the head unit includes a piezoelectric element as an actuator to eject ink
Implementation Method 2
a switching power supply configured to supply electric power to the head unit
Data Source
AI summary
An image forming apparatus includes a head unit, and a switching power supply. The head unit is configured to eject ink. The switching power supply is configured to supply electric power to the head unit. Further, the head unit includes an actuator unit to eject ink; and the switching power supply operates with a switching frequency different from a natural vibration frequency of the actuator unit.