Ion Detector RF Circuit Layout for Stable Potential Control
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Solution Overview
Problem
Stable detection is difficult in radio frequency generators used for field asymmetric ion mobility spectrometry due to load fluctuations causing potential fluctuations in the series resonant circuit.
Innovation Solution
A detector design incorporating a potential supply circuit with a dual inductor and transistor configuration, including a PWM signal supply section and compensation potential supply sections, to stabilize the detection process by minimizing the impact of load fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a series resonant circuit is used to drive a capacitive load in an RF generator, then the RF generator can operate efficiently, but load fluctuations cause potential fluctuations making stable detection difficult
Solution Approach 1:
The patent divides the single resonant circuit into two separate parallel resonant circuits. Each resonant circuit is connected to a different electrode (first electrode and second electrode), allowing independent potential control. This segmentation isolates the circuits from each other's load fluctuations, preventing potential fluctuations from affecting detection stability while maintaining RF generation efficiency.
Solution Approach 2:
The patent introduces a capacitor connected in parallel with the second resonant circuit as an intermediary element. This capacitor acts as a buffer to further stabilize the potential supplied to the second electrode, absorbing residual fluctuations and ensuring stable detection conditions. The intermediary capacitor complements the parallel resonant circuit structure in mitigating load fluctuation effects.
2Device complexity
If the series resonant circuit output is directly connected to the capacitive load of the detector, then the circuit is simple, but potential fluctuations occur when load fluctuations occur
Solution Approach 1:
The patent replaces the simple series resonant circuit with two parallel resonant circuits connected to different electrodes. Although this increases structural complexity, it provides independent potential control for each electrode, isolating them from mutual load fluctuations and ensuring potential stability required for reliable detection.
Solution Approach 2:
The capacitor connected in parallel with the second resonant circuit serves as an intermediary stabilizing element. It buffers potential fluctuations without requiring complex active control circuits, achieving a balance between circuit complexity and potential stability for reliable 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 detector design stabilizes the detection process by maintaining consistent potential levels, enhancing the reliability of charged particle detection.
Implementation Method 1
a resonant circuit and a capacitor connected in parallel with respect to an output portion of the first inductor
Implementation Method 2
a potential supply circuit including a first inductor and a second inductor
Data Source
AI summary
A detector includes a first electrode, a second electrode facing the first electrode with a space and forming a flow path for charged particles as objects to be detected between the first electrode and the second electrode, a third electrode arranged side by side with the second electrode on a downstream side in the flow path with respect to the second electrode and configured to collect the charged particles, and a potential supply circuit configured to supply a potential to at least one of the first electrode and the second electrode, in which the potential supply circuit includes a first inductor including a first input portion and a first output portion, and a second inductor including a second input portion and a second output portion, the first input portion of the first inductor is connected to a DC power supply, and the second input portion of the second inductor is connected to the first electrode or the second electrode.