Hearing Aid Power Supply with Capacitor Buffer
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Solution Overview
Problem
Conventional hearing aids face power limitations due to small batteries with high internal resistance, leading to voltage drops and reduced sound quality or interrupted operation during wireless communication, as Zinc-air batteries can only supply peak currents for short durations.
Innovation Solution
The new hearing aid design alleviates the power supply from providing peak currents to the wireless communication unit by using an energy storage unit, such as capacitors, which are replenished through a current limiting unit, reducing peak current draw from the power supply and avoiding significant voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small Zinc-air battery is used to ensure compact hearing aid size, then the hearing aid becomes compact and inconspicuous, but the battery's high internal resistance causes significant voltage drops during wireless communication
Solution Approach 1:
The power supply system is segmented into two distinct components: a small Zinc-air battery for compactness and an energy storage unit (capacitor) for stable power delivery. This segmentation allows each component to fulfill its specific function optimally while working together as an integrated system.
Solution Approach 2:
An energy storage unit (capacitor) is introduced as an intermediary between the battery and the wireless communication unit. This intermediary stores energy from the battery and delivers it during peak demand periods, preventing voltage drops without requiring a larger battery.
2Adaptability or versatility
If the battery supplies peak currents for wireless transmission, then wireless communication is enabled, but the supply voltage decreases below operational thresholds after limited time periods
Solution Approach 1:
The energy storage unit is pre-charged from the battery before peak current demands occur. This preliminary energy accumulation allows the system to immediately supply peak currents during wireless communication without depleting the battery voltage below operational thresholds.
Solution Approach 2:
The system changes the electrical parameters by introducing a capacitor with low internal resistance that can rapidly discharge high peak currents. This parameter change enables sustained wireless communication duration by maintaining stable voltage levels during transmission bursts.
3Duration of action of stationary object
If the radio chip duty cycle is kept low to allow battery recovery, then the battery can sustain operation, but wireless communication efficiency is reduced
Solution Approach 1:
The energy storage unit acts as a buffer that decouples the battery from the radio chip's peak current demands. This intermediary allows the radio chip to operate at higher duty cycles while the battery experiences reduced stress, extending its operational lifespan without sacrificing communication efficiency.
Solution Approach 2:
The power supply system becomes dynamic with the capacitor charging during low-demand periods and discharging during high-demand periods. This dynamic behavior allows flexible duty cycle operation, enabling efficient wireless communication while preserving battery life through adaptive power management.
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 extends the duration of wireless communication, maintains sound quality, and prevents interruptions by ensuring a stable power supply to the hearing aid circuit, even during prolonged wireless transmission and reception.
Implementation Method 1
A new hearing aid is provided which comprises a hearing aid circuit with a power supply connected to supply power to the hearing aid circuit, an energy storage unit connected to the communication unit for power supply of the communication unit, wherein the energy storage unit is connected to the power supply through a current limiting unit for replenishment of the energy storage unit with energy from the power supply
Implementation Method 2
The energy storage unit is further connected to the power supply through a current limiting unit for replenishment of the energy storage unit with energy from the power supply, whereby the energy storage unit draws lower peak currents from the power supply than if the current limiting unit was absent
Data Source
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AI summary
In a new hearing aid, an energy storage unit is coupled to supply peak currents to a wireless communication unit of the hearing aid, and the energy storage unit is further coupled to a power supply of the hearing aid for energy replenishment from the power supply through a current limiting unit, such as a resistor.