Comb Filter Noise Filtering in Implantable Medical Device Wireless Charging
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Solution Overview
Problem
Existing implantable medical device charging systems face inefficiencies due to noise interference in wireless energy transfer, which can reduce charging speed and reliability, and hinder the detection of circuit states during charging operations.
Innovation Solution
An external charging device equipped with a coil, signal generating circuitry, monitoring circuitry, and a comb filter that filters noise from output signals based on the charging frequency, allowing for detection of circuit states and adaptive frequency adjustments to improve charging efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless energy transfer is performed at high power to charge IMD quickly, then charging speed is improved, but noise interference in the monitoring signal increases, reducing measurement precision
Solution Approach 1:
A comb filter is introduced as an intermediary signal processing component between the monitoring circuit and the circuit state detection logic. The comb filter selectively attenuates noise frequencies while preserving the charging frequency signal, enabling accurate circuit state detection even during high-power wireless charging operations.
Solution Approach 2:
The system dynamically adjusts the charging frequency based on detected circuit states and modifies the comb filter characteristics to match the operating frequency. This parameter adaptation allows the system to maintain optimal noise filtering performance across varying charging conditions and power levels.
2Measurement precision
If monitoring sensitivity is increased to detect circuit states accurately, then measurement precision is improved, but noise from wireless charging interferes more strongly, worsening reliability
Solution Approach 1:
The comb filter serves as a frequency-selective intermediary that allows the monitoring circuit to operate at high sensitivity without being overwhelmed by charging noise. It selectively passes the desired monitoring signal while blocking noise frequencies, ensuring reliable circuit state detection throughout the charging process.
Solution Approach 2:
The system continuously monitors circuit states and uses this feedback to dynamically adjust charging parameters including frequency and power level. When noise interference is detected or circuit state changes occur, the system adapts its operation to maintain reliable monitoring and safe charging.
3Productivity
If charging frequency is increased to improve charging efficiency, then productivity is improved, but noise filtering becomes more difficult, worsening measurement precision
Solution Approach 1:
The comb filter characteristics are dynamically adjusted to match the operating charging frequency. As the system increases charging frequency to improve efficiency, the filter parameters are simultaneously modified to maintain optimal noise rejection at the new frequency, preventing degradation of measurement precision.
Solution Approach 2:
The system transitions from static to dynamic filter configuration, where the comb filter characteristics adapt in real-time to the charging frequency. This dynamic adjustment ensures that noise filtering effectiveness is maintained across the full range of operating frequencies, from low to high efficiency modes.
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 effectively filters noise, enhances signal-to-noise ratios, and allows for safer and more efficient wireless charging of implantable medical devices by varying the charging frequency based on detected circuit states, thereby improving charging speed and reliability.
Implementation Method 1
signal generating circuitry coupled to the coil to drive current through the coil at a charging frequency to induce current in a second coil in the implantable medical device
Data Source
AI summary
The present disclosure provides systems and methods for wirelessly charging an implantable medical device. An external charging device includes a coil, signal generating circuitry to drive current through the coil at a charging frequency to induce current in a second coil in the implantable medical device, monitoring circuitry to generate an output signal to monitor charging operations, and a comb filter. The comb filter is configured to apply filtering to the output signal to remove noise from the output signal, wherein the filtering is applied based on the charging frequency. The external charging device is configured to process the filtered output signal to detect a circuit state of charging circuitry of the implantable medical device during charging operations, and the external charging device is configured to vary the charging frequency based, in part, on detection of the circuit state of the charging circuitry of the implantable medical device.