Ferrite Core Coil Gap Optimization for Iron Loss Reduction
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Solution Overview
Problem
Existing liquid ejecting-type printing apparatuses face challenges in reducing heat generation and power consumption due to high iron loss in coils used for smoothing amplification modulation signals at high frequencies, which affects the quality and resolution of printed output.
Innovation Solution
A liquid ejecting apparatus utilizing a ferrite core-type coil with a core gap of 1.1 mm or wider and a number of turns equal to or greater than three, which reduces iron loss and maintains inductance, allowing for high conversion efficiency without increasing heat generation or power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a coil is used to smooth the amplification modulation signal at high frequency, then the signal smoothing function is achieved, but iron loss increases causing heat generation and power consumption increase
Solution Approach 1:
The patent applies parameter changes by optimizing the core gap dimension to 1.1mm or more and specifying the number of turns to be 3 or more. These parameter adjustments reduce the magnetic flux density in the ferrite core, thereby decreasing eddy-current loss and hysteresis loss while maintaining the necessary inductance value for signal smoothing at high frequencies.
Solution Approach 2:
The patent employs ferrite core material, which is a composite ceramic material with high magnetic permeability and low electrical conductivity. This material composition allows the coil to maintain effective magnetic coupling for signal smoothing while its inherent electrical insulation properties reduce eddy-current losses compared to metallic core materials.
2Loss of energy
If the core gap of the coil is increased to reduce iron loss, then eddy-current loss decreases, but inductance value may change
Solution Approach 1:
The patent simultaneously adjusts multiple parameters to compensate for the inductance change caused by increasing the core gap. By specifying both the core gap (1.1mm or more) and the number of turns (3 or more), the design maintains the necessary inductance value while achieving reduced eddy-current loss through the larger gap.
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 solution enables low power consumption and high resolution printing by preventing iron loss and maintaining inductance, ensuring stable and efficient operation of the liquid ejecting apparatus.
Implementation Method 1
a coil that smooths the amplification modulation signal to generate a drive signal
Implementation Method 2
an iron loss (loss of core material) is often more dominant than a copper loss (loss of wire material) as a factor increasing heat generation during power consumption. An eddy-current loss accounting for a large portion of the iron loss is proportional to square of magnetic flux density
Implementation Method 3
a piezoelectric element that deforms when the drive signal is applied thereto, a cavity that expands or contracts due to deformation of the piezoelectric element
Data Source
AI summary
A driving circuit for driving a capacitive load includes a signal modulation section that causes an original drive signal to be pulse-modulated to generate a modulation signal, a signal amplification section that amplifies the modulation signal to generate an amplification modulation signal, and a coil that smooths the amplification modulation signal to generate a drive signal.