Inkjet Drive Amplifier Circuit With MOSFET Feedback Wiring
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Solution Overview
Problem
Separately-excited type digital amplifiers used in printing devices require a large number of circuits, leading to a large circuit size and potential inefficiencies.
Innovation Solution
A self-excited digital amplifier configuration using a comparator, gate driver, and N-type MOSFETs with negative feedback wiring to simplify the circuit design and reduce size, while maintaining efficient liquid ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a separately-excited type digital amplifier is used to amplify the drive waveform signal, then power loss is suppressed, but the circuit size becomes large due to requiring a large number of circuits including arithmetic and modulation circuits
Solution Approach 1:
The patent combines the arithmetic circuit and modulation circuit into a single integrated amplifier circuit. The amplifier directly generates the drive waveform signal with appropriate frequency and amplitude without requiring separate arithmetic and modulation circuits, thereby reducing circuit size while maintaining power efficiency.
Solution Approach 2:
The amplifier circuit is designed to perform multiple functions simultaneously: it amplifies the drive waveform signal, generates the appropriate frequency, and provides the necessary modulation. This multi-functional design eliminates the need for separate dedicated circuits for each function, reducing overall circuit complexity and size.
2Loss of energy
If a separately-excited type digital amplifier with arithmetic circuit and modulation circuit is used, then power efficiency is improved, but device complexity increases due to the large number of required circuits
Solution Approach 1:
The patent merges multiple functional circuits (arithmetic circuit, modulation circuit, and amplifier) into a single integrated amplifier unit. This consolidation maintains the power efficiency benefits of digital amplification while significantly reducing device complexity by eliminating the need for separate dedicated circuits.
Solution Approach 2:
The amplifier is designed to autonomously generate the drive waveform signal with the correct frequency and amplitude characteristics without requiring external arithmetic or modulation circuits. The amplifier performs all necessary signal processing functions internally, reducing overall system 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 self-excited digital amplifier reduces circuit size and enhances the accuracy of ink ejection by stabilizing the drive waveform, improving the quality of printed images.
Implementation Method 1
a printing device that is configured to eject liquid from nozzles by driving piezoelectric elements
Data Source
AI summary
A printing device comprises an amplifying circuit configured to amplify a drive waveform signal, and an energy generating element. The energy generating element is configured to eject the liquid from a nozzle. The amplifying circuit includes a comparator of which the drive waveform signal is input to a positive input terminal, a gate driver, an output signal being input to the gate driver from the comparator, a first N-type MOSFET and a second N-type MOSFET. A drain of the first N-type MOSFET is connected to a power supply. A source of the first N-type MOSFET is connected to a drain of the second N-type MOSFET. The printing device comprises negative feedback wiring configured to connect a negative input terminal of the comparator to the source of the first N-type MOSFET and the drain of the second N-type MOSFET.