DBD Disk Control Circuit Using PWM and Frequency Modulation
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Solution Overview
Problem
Current control circuits for dielectric barrier discharge (DBD) plasma electrodes in three-dimensional printers are complex, bulky, and difficult to control, requiring high voltage AC signals for improved tensile strength in printed components, but lack simplicity and compactness.
Innovation Solution
A control circuit that generates a primary AC voltage signal with a set frequency and variable duty cycle, using a switching regulator and modulation circuit to modulate a DC voltage signal into a modulated DC signal with a frequency component, which is then transformed into a secondary AC voltage signal for the DBD disk, allowing for precise power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current DBD plasma electrode control circuits are used, then high voltage AC signal generation is achieved, but the circuits are complex, bulky, and difficult to control
Solution Approach 1:
The patent transforms the control approach by changing the signal generation parameters - using a microcontroller to generate PWM signals with variable duty cycles that control MOSFET switching, thereby simplifying the control circuit while maintaining plasma generation capability. The complexity is reduced by parameterizing the control signal generation rather than using complex analog high voltage circuitry.
Solution Approach 2:
The patent replaces complex electrical control circuits with a microcontroller-based digital control system. The microcontroller (ATmega328P) generates precise PWM signals to control power MOSFETs, substituting bulky analog high voltage generation circuits with a compact digital control architecture that is easier to program and adjust.
2Reliability
If current DBD plasma electrode control circuits are used, then high voltage AC signal generation is achieved, but the circuits require large amounts of packaging space
Solution Approach 1:
The patent integrates multiple control functions into a single microcontroller unit, nesting the PWM generation, duty cycle control, and frequency regulation capabilities within one compact IC. This nesting approach consolidates what would otherwise require separate discrete components and circuit boards, dramatically reducing the overall packaging area of the control system.
Solution Approach 2:
By changing from analog high voltage circuit generation to digital PWM-based control, the patent achieves compact integration. The microcontroller generates precise control signals that drive power MOSFETs, eliminating the need for bulky analog high voltage transformation and regulation circuits, thereby reducing packaging space.
3Reliability
If current DBD plasma electrode control circuits are used, then plasma generation is achieved, but the circuits are relatively difficult to control
Solution Approach 1:
The patent replaces difficult-to-control analog circuits with a microcontroller-based digital control system. The ATmega328P microcontroller provides programmable PWM output that precisely controls MOSFET switching, allowing easy adjustment of duty cycle and frequency through software parameters rather than complex analog component adjustments.
Solution Approach 2:
The patent implements feedback control through the microcontroller's ability to monitor and adjust PWM duty cycles in real-time. The controller can sense plasma generation conditions and automatically adjust the power delivery parameters, making the system easier to control and more responsive to changing conditions without manual intervention.
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 provides a compact and simple method for controlling the power supplied to the DBD disk, enabling fine control over the amount of power based on the duty cycle and frequency, improving the tensile strength of printed components by adjusting Joule heating according to the geometry of the printed component.
Implementation Method 1
the switching regulator modulates the DC voltage signal based on a variable duty cycle to create a modulated DC signal
Implementation Method 2
The modulation circuit introduces a frequency component to the modulated DC signal, wherein the primary AC voltage signal includes a variable duty cycle and a set frequency
Implementation Method 3
The flyback transformer transforms the primary AC voltage signal into a secondary AC voltage signal that is sent to the DBD disk
Implementation Method 4
a dielectric barrier discharge (DBD) electrode that generates plasma
Implementation Method 5
The plasma provides a conductive pathway between a point of extrusion located below the nozzle and the printed component
Implementation Method 6
The conductive pathway enables heating of the printed component, or at least portions of the printed component proximate to the point of extrusion
Data Source
AI summary
A control circuit for generating a primary alternating current (AC) voltage signal provided to a dielectric barrier discharge (DBD) disk of a three-dimensional printer includes a switching regulator receiving a direct current (DC) voltage signal. The switching regulator modulates the DC voltage signal based on a variable duty cycle to create a modulated DC signal. The control circuit also includes a modulation circuit in electrical communication with the switching regulator. The modulation circuit introduces a frequency component to the modulated DC signal, where the primary AC voltage signal includes a variable duty cycle and a set frequency, and the frequency component introduced into the modulated DC signal is representative of the set frequency of the primary AC voltage.