Power Supply Apparatus Feedback Control for Plasma Generator Stability
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Solution Overview
Problem
Conventional power supply apparatuses for plasma generators struggle to maintain stable and constant electric power input due to varying load conditions, leading to instability in ozone and radical gas generation, particularly for capacitive loads where impedance is nonlinear, causing phase lag or lead issues and reducing the power factor, which complicates feedback control and long-term operation.
Innovation Solution
A power supply apparatus with an inverter that converts direct-current power to alternating-current power, a controller for feedback control, and detection units to accurately manage direct-current power input, ensuring a one-to-one correspondence between detected direct current and electric power input, thereby stabilizing the power supply to the plasma generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If voltage is supplied from the power supply apparatus to the plasma generator, then the plasma generator can generate ozone gas and radical gas, but the impedance of the capacitive load varies depending on load conditions causing unstable operation
Solution Approach 1:
The controller performs feedback control based on the detected direct current to maintain stable operation. The detection unit detects the direct current input to the inverter, and the controller adjusts the inverter operation to keep the direct current within a target range, compensating for impedance variations in the capacitive load.
Solution Approach 2:
The patent replaces voltage-based control with direct current-based control. Instead of controlling the alternating current voltage output to the plasma generator, the system controls the direct current input to the inverter, which provides a more stable and controllable parameter for managing capacitive load variations.
2Power
If the power supply apparatus increases active power output, then more electric power capacity is required, but the load power factor becomes extremely small due to phase lag
Solution Approach 1:
The controller uses feedback control based on detected direct current to optimize the operating point of the inverter. By continuously monitoring and adjusting the direct current input, the system maintains operation near optimal efficiency points, reducing the total power capacity required.
3Ease of operation
If feedback control is implemented using alternating current parameters, then power input can be controlled, but the nonlinear impedance makes it difficult to achieve stable and accurate control
Solution Approach 1:
The patent substitutes control of alternating current voltage/output with control of direct current input to the inverter. The direct current is a linear parameter that is easier to measure and control accurately compared to the nonlinear alternating current parameters in capacitive loads. The detection unit directly measures the smooth direct current waveform without the complexity of AC parameter measurements.
Solution Approach 2:
The controller performs feedback control based on the detected direct current to maintain stable operation. The detection unit detects the direct current input to the inverter, and the controller adjusts the inverter operation to keep the direct current within a target range, compensating for impedance variations in the capacitive load.
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 solution allows for precise control of electric power input, maintaining stability and accuracy, reducing noise interference, and ensuring consistent gas concentration and purity, enabling long-term stable operation of the plasma generator.
Implementation Method 1
an inverter (3) that converts direct-current electric power to alternating-current electric power
Implementation Method 2
The gas in the discharge space is excited by an electric field caused by the application of the voltage, generating a large amount of ozone gas and a large amount of radical gas
Implementation Method 3
a plasma generator being a capacitive load apparatus that generates a large amount of ozone gas and a large amount of radical gas
Data Source
AI summary
A power supply apparatus includes a controller that performs the following action. The controller determines a target direct-current electric amount value in accordance with an external input. Then, the controller performs feedback control in such a manner that an amount of direct-current electric power input to an inverter reaches the target direct-current electric amount value.