Liquid Ejection Driving Circuit for Parasitic Turn-On Suppression
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Solution Overview
Problem
Existing driving circuits for liquid ejection apparatuses, such as ink jet printers, experience increased power consumption due to unintentional turning on of transistors caused by parasitic capacitance, leading to through-current and inefficiency.
Innovation Solution
Incorporating a third transistor with its drain electrode coupled to the gate electrode of the second transistor and source electrode to the grounding conductor, which suppresses self-turn-on by branching current to parasitic capacitance, reducing voltage changes and maintaining the transistor in an Off state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the first transistor is turned on to change the voltage at the coupling point, then the driving signal is generated, but current is supplied to the parasitic capacitance of the second transistor causing unintentional turning on and increased power consumption
Solution Approach 1:
A third transistor is introduced as an intermediary component between the coupling point and the gate electrode of the second transistor. This third transistor acts as a mediator to control the charging of the parasitic capacitance, preventing direct current flow that would cause unintentional turning on of the second transistor, thereby reducing power consumption while maintaining driving signal generation capability
Solution Approach 2:
The parasitic capacitance of the second transistor, which originally causes harmful unintentional turning on and power loss, is converted into a beneficial element by using the third transistor to control its charging. The third transistor allows the parasitic capacitance to be charged in a controlled manner during the off-state of the second transistor, transforming the harmful effect into a manageable characteristic that does not cause through-current
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 configuration reduces power consumption and prevents through-current, enhancing the efficiency of the driving circuit by minimizing self-turn-on occurrences.
Implementation Method 1
current is supplied to a parasitic capacitance of the second transistor, and therefore, a voltage of a gate electrode of the second transistor may become equal to or larger than a threshold voltage of the second transistor
Data Source
AI summary
A driving circuit generating a driving signal, includes a modulator generating a modulated signal by performing pulse modulation on a signal specifying a waveform of the driving signal, an amplifier generating an amplified signal by amplifying the modulated signal, and a smoothing section generating the driving signal by smoothing the amplified signal. The amplifier includes first and second transistors coupled in series between a voltage line to which a voltage which is higher than a ground voltage is supplied and a grounding conductor to which the ground voltage is supplied, and a third transistor having a drain electrode coupled to a gate electrode of the second transistor and a source electrode coupled to the grounding conductor. The first and second transistors are exclusively set to an On state in accordance with the modulated signal, and the amplified signal is output from a node which couples the first and second transistors.