Parallel Interleaved Switching for Ion Mobility Waveform Generation
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Solution Overview
Problem
Existing ion mobility spectrometry devices face limitations in achieving high switching frequencies due to power loss and thermal issues, leading to reduced signal-to-noise ratio and inefficient ion transmission, while existing waveform generators restrict frequency adjustment, hindering optimal performance.
Innovation Solution
An arrangement using multiple switching circuits operated in parallel with interleaving logic to generate a waveform with adjustable frequency and duty cycle, reducing power loss and enabling higher switching frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the switching frequency is increased to improve signal-to-noise ratio and ion transmission, then the analytical performance is improved, but power loss and thermal issues increase
Solution Approach 1:
The waveform generation is segmented across multiple parallel switching circuits (first switching circuit, second switching circuit) that operate at different phases. Each circuit handles a portion of the switching duty cycle, distributing the power loss and thermal load across multiple components rather than concentrating it in a single circuit operating at full frequency.
Solution Approach 2:
The interleaved switching circuits operate in a periodic manner where the first switching circuit and second switching circuit alternate their active periods. This periodic distribution allows each circuit to operate at a lower effective frequency while maintaining the overall high switching frequency needed for optimal ion transmission and signal-to-noise ratio.
2Productivity
If the switching frequency is increased to improve ion transmission, then the effective gap is increased and more ions pass the filter, but thermal issues and component wear increase
Solution Approach 1:
The thermal load is segmented across multiple switching circuits that share the switching duty. Each circuit operates at a reduced individual frequency, generating less heat per component, while the combined output achieves the high switching frequency needed for optimal ion transmission through the filter.
Solution Approach 2:
The interleaved operation of multiple switching circuits ensures continuous waveform generation without interruption. The first and second switching circuits alternate in a coordinated manner, maintaining the high-frequency oscillating electric field required for effective ion separation and transmission while distributing thermal stress over time across different components.
3Adaptability or versatility
If existing waveform generators are used to drive the ion mobility device, then the device can operate, but frequency adjustment is restricted and optimal performance cannot be achieved
Solution Approach 1:
The system dynamically adjusts the switching frequency and duty cycle of multiple interleaved circuits to optimize performance for different analytical conditions. The frequency can be varied independently of component switching rates, allowing real-time adaptation to achieve optimal ion transmission and separation for different analytes and operating conditions.
Solution Approach 2:
The invention enables independent variation of key waveform parameters including switching frequency, duty cycle, and voltage amplitude through the coordinated control of multiple switching circuits. This parameter flexibility allows optimization of the oscillating electric field characteristics for different analytical requirements, improving separation efficiency and detection sensitivity.
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
Enhances signal-to-noise ratio and ion transmission by allowing higher switching frequencies, improving the analytical performance of ion mobility devices with reduced power loss and component wear.
Implementation Method 1
Differential Mobility Spectrometry (DMS) known commonly also as Field Asymmetric Ion Mobility Spectrometry (FAIMS) is an atmospheric pressure technique to separate ionized gas components based on their nonlinear electrical mobility among neutral gas molecules
Implementation Method 2
either one pair or multiple pairs of coaxial or planar electrodes are connected to a high voltage source (separation voltage SV) generating an asymmetrically oscillating electric field with high and low field parts between the electrodes perpendicular with the flow
Implementation Method 3
this electric field is superimposed with a small static DC electrical field (often termed compensation voltage CV) to adjust the offset of the field
Implementation Method 4
Driving the ion filter with pulses causes power losses in the transistors, gate drivers, as well as via filter impedance. Calculating the power loss is complicated and depends on MOSFET's parasitic components such as gate capacitances and RDS (on) but more importantly is linearly dependent on the switching frequency
Data Source
AI summary
An arrangement for providing a waveform for driving an ion mobility device. The arrangement comprises at least a plurality of switching circuits, each switching circuit comprising at least two switches operatively coupled to a first voltage source (VH), wherein the plurality of switching circuits is arranged to be coupled in parallel with respect to each other. The arrangement additionally comprises an interleaving circuit configured to receive a time-varying electrical input signal exhibiting an input frequency and based on said input signal, operate the plurality of switching circuits to provide a waveform via the switches, said waveform exhibiting a switching frequency that is essentially equivalent to the input frequency.