Piezoelectric Driving Circuit for Ink Circulation Pumps
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Solution Overview
Problem
In the large format ink jet market, the use of inks with varying physical properties can lead to image quality reduction due to precipitation, and existing driving circuits for piezoelectric elements in ink circulation pumps may not effectively manage high voltage driving efficiently.
Innovation Solution
A driving circuit configuration that includes a power supply with positive and negative electrodes, switching elements, resistors, and a control unit to supply control signals to the switching elements, allowing for efficient driving of piezoelectric elements in ink circulation pumps, thereby preventing ink precipitation and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a half bridge circuit with a single power supply is used to drive the piezoelectric element, then the device complexity is reduced, but the power handling capability is limited and cannot efficiently manage high voltage driving
Solution Approach 1:
The single power supply is segmented into two separate power supplies (first power supply and second power supply), each responsible for driving specific switching elements. This segmentation enables independent control of voltage polarity and magnitude, allowing efficient high voltage driving while maintaining manageable circuit complexity through modular design
Solution Approach 2:
The circuit transitions from a single-dimensional power supply configuration to a two-dimensional power supply configuration with distinct positive and negative voltage sources. This dimensional change enables the circuit to handle higher power levels by independently controlling voltage polarity, effectively resolving the contradiction between power capability and complexity
2Power
If a full bridge circuit with a single power supply is used to drive the piezoelectric element at high voltage, then the power handling capability is improved, but voltage vibration occurs at one end of the piezoelectric element
Solution Approach 1:
A voltage stabilization circuit is introduced as an intermediary component between the power supply and the piezoelectric element. This circuit includes a capacitor connected in parallel with the piezoelectric element and a resistor connected in series, serving as a mediator that filters voltage vibrations and stabilizes the voltage applied to the piezoelectric element during high voltage driving
Solution Approach 2:
The voltage stabilization circuit is designed to preemptively counteract voltage vibrations before they can affect the piezoelectric element. By placing the capacitor and resistor configuration in advance, the circuit cushions against voltage fluctuations and prevents harmful vibrations from occurring in the first place during high power operation
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 proposed driving circuit effectively manages high voltage driving of piezoelectric elements, preventing ink precipitation and maintaining image quality in large format ink jet printing applications.
Implementation Method 1
a piezoelectric element as a driving source is often provided as the ink circulation pump in the printing head
Data Source
AI summary
A piezoelectric element driving circuit includes: a power supply including a positive electrode outputting a positive voltage and a negative electrode outputting a negative voltage; first and third switching elements including input terminals connected to the positive electrode; second and fourth switching elements including input terminals connected to the negative electrode; a first resistor connecting an output terminal of the first switching element and a first end of the piezoelectric element; a second resistor connecting the first end and an output terminal of the second switching element; a third resistor connecting an output terminal of the third switching element and a second end of the piezoelectric element; a fourth resistor connecting the second end and an output terminal of the fourth switching element, and a controller supplying a first control signal to the first and second switching elements and a second control signal to the third and fourth switching elements.